POLISHING MACHINE

Description

RELATED APPLICATION INFORMATION

This application is a continuation-in-part of U.S. application Ser. No. 16/862,688, filed on Apr. 30, 2020, through which this application also claims the benefit under 35 U.S. C. § 119(a) of Chinese Patent Application No. 201910516067.3 filed with the China National Intellectual Property Administration (CNIPA) on Jun. 14, 2019 and Chinese Patent Application No.201910664593.4 filed with the China National Intellectual Property Administration (CNIPA) on Jul. 23, 2019.

This application also claims the benefit under 35 U.S. C. § 119(a) of International Application Number PCT/CN2024/116251 filed with the CNIPA on Sep. 2, 2024, and International Application Number PCT/CN2025/093146, filed with the CNIPA on May. 7, 2025.

The disclosures within each of these publication is incorporated herein by reference in its entirety.

BACKGROUND

A polishing machine in the related art is a power tool used for performing mechanical grinding, polishing, and waxing operations on parts. The polishing machine, also known as a grinder, is widely used in many fields such as automotive and construction.

The polishing machine includes a main engine, a working head, and a base plate, wherein the working head is connected to the main engine. Different working heads have different eccentric distances, and installing different working heads to the main engine can achieve different working trajectories or movement patterns. The base plate is connected to the working head, and the base plate is used to connect consumables such as polishing paper, and the base plate is replaceable. However, when an existing working head is installed to the main engine, a two-step operation by a user is required. A first step is to pull up an operating sleeve on the main engine to form a space for insertion of the working head. A second step is to insert the working head into the operating sleeve. The operation is cumbersome, not convenient enough, and has low efficiency.

This section provides background information related to the present application, which may not necessarily be prior art.

SUMMARY

This application adopts the following technical solution.

A polishing machine, including a housing; a motor; a main shaft drivably connected to a motor shaft of the motor, the main shaft being rotatable relative to the housing around a first axis; a mounting shaft detachably connected to the main shaft; and a limiting member and a locking mechanism, wherein a movement of the mounting shaft activates the locking mechanism, such that the locking mechanism allows the limiting member to move to restrict the mounting shaft's motion along the first axis.

In one example, a limiting groove is formed on the mounting shaft, and during a process of the mounting shaft being connected to the main shaft from bottom to top, the limiting member falls into the limiting groove to lock the mounting shaft in place.

In one example, the locking mechanism includes a driving member and an operating sleeve movably sleeved on the main shaft, the operating sleeve being capable of driving the driving member to move, such that the limiting member disengages from the limiting groove.

In one example, the driving member is a first driving member, and the first driving member rotationally drives the limiting member to disengage from the limiting groove.

In one example, the driving member is a second driving member, and the second driving member translationally drives the limiting member to disengage from the limiting groove.

In one example, the second driving member is a ring sleeve structure sleeved on the main shaft, a relief groove is formed on an inner side of the second driving member, a connecting end of the main shaft is provided with a insertion hole for insertion of the mounting shaft along an axial direction, an accommodating portion is provided radially penetrating through the connecting end of the main shaft, and the limiting member has a relief position where the limiting member is pushed by the mounting shaft to enter the relief groove and a locking position where the limiting member is engaged in the limiting groove.

In one example, the second driving member includes a first retaining portion located on an upper side of the relief groove, the first retaining portion have an inclined surface on a side close to the relief groove, and a diameter of the first retaining portion is smaller than a diameter of the relief groove.

In one example, before the second driving member is driven by the operating sleeve, the first retaining portion abuts against an upper portion of the limiting member.

In one example, an accommodating portion is provided through a connecting end of the main shaft in a radial direction, and the limiting member is movably disposed within the accommodating portion; the polishing machine further includes a limiting sleeve, the limiting sleeve is movably sleeved on the main shaft, and a top of the limiting sleeve forms a limiting portion that limits the limiting member within the accommodating portion; the limiting member has an initial position where the limiting member is limited within the accommodating portion, a relief position where the limiting member is pressed by the mounting shaft to move past the limiting portion to an upper side of the limiting portion, and a locking position where the limiting member is engaged between the limiting portion and the limiting groove.

In one example, the polishing machine further includes a pivoting pressing plate and an elastic member, the pivoting pressing plate is located such that two ends of a pivot shaft of the pivoting pressing plate respectively pressed against a top of the limiting member and a top of the limiting sleeve and form a seesaw structure, and the elastic member has a movement tendency to reset the limiting portion to limit the limiting member within the accommodating portion.

In one example, the first driving member includes a pivoting lifting plate, the operating sleeve is capable of driving the pivoting lifting plate to rotate, and rotation of the pivoting lifting plate drives the pivoting pressing plate to rotate in an opposite direction.

In one example, when the operating sleeve is operated, the mounting shaft is disengageable from the main shaft.

In one example, when the operating sleeve is moved in an up-down direction, the mounting shaft is disengageable from the main shaft.

In one example, the mounting shaft is connectable to an eccentric body, and a working attachment for performing a polishing operation is detachably connected on the eccentric body.

In one example, the polishing machine further including a reset assembly, a driving hole centered on the first axis is formed within the main shaft, the driving hole is for insertion of the mounting shaft, the reset assembly is disposed within the driving hole and located at an upper end of the mounting shaft, the reset assembly includes an elastic member and a return block, and the elastic member provides an elastic force for downward movement of the return block.

A power tool, including: a housing; a motor; a main shaft drivably connected to a motor shaft of the motor and rotatable relative to the housing around a first axis; a mounting shaft detachably connected to the main shaft, and a working attachment is attached to a bottom of the mounting shaft; a limiting member located at a first position or a second position, when the mounting shaft is mounted to the main shaft, the limiting member is located at the first position to restrict movement of the mounting shaft along the first axis; and when the limiting member is at the second position, the limiting member allows the mounting shaft to disengage from the main shaft; and a locking mechanism configured to drive the limiting member to move from the second position to the first position; wherein a movement of the mounting shaft activates the locking mechanism such that the limiting member is allowable to move to the second position.

In one example, a limiting groove is formed on the mounting shaft, and during a process of the mounting shaft being connected with the main shaft from bottom to top, the limiting member falls into the limiting groove to lock the mounting shaft in place.

In one example, the locking mechanism includes a driving member and an operating sleeve movably sleeved on the main shaft, the operating sleeve is capable of driving the driving member to move, such that the limiting member disengages from the limiting groove, and the driving member translationally drives the limiting member to disengage from the limiting groove.

In one example, the power tool further including a reset assembly, a driving hole centered on the first axis is formed within the main shaft, the driving hole is for insertion of the mounting shaft, the reset assembly is disposed within the driving hole and located at an upper end of the mounting shaft, and the reset assembly is configured to keep the limiting member at the second position when the mounting shaft disengages from the main shaft.

In one example, the reset assembly includes an elastic member and a return block, and the elastic member provides an elastic force for downward movement of the return block.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a schematic diagram of a polishing machine;

FIG. 2 is an internal schematic diagram of the polishing machine;

FIG. 3 is a schematic diagram of the polishing machine with a housing removed;

FIG. 4 is a front view of the polishing machine;

FIG. 5 is a schematic diagram of a mounting shaft of the polishing machine;

FIG. 6 is a first state diagram during a connecting process of the mounting shaft and a main shaft of one embodiment of the polishing machine;

FIG. 7 is a second state diagram during the connecting process of the mounting shaft and the main shaft of one embodiment of the polishing machine;

FIG. 8 is a third state diagram during the connecting process of the mounting shaft and the main shaft of one embodiment of the polishing machine;

FIG. 9 is a state diagram during a separating process of the mounting shaft and the main shaft of one embodiment of the polishing machine;

FIG. 10 is a schematic diagram of a first driving member, a limiting sleeve, a pivoting pressing plate, and a limiting member of one embodiment of the polishing machine;

FIG. 11 is a schematic diagram of the main shaft, the first driving member, the limiting sleeve, the pivoting pressing plate, and the limiting member of one embodiment of the polishing machine;

FIG. 12 is a first state diagram during a connecting process of the mounting shaft and the main shaft of a second embodiment of the polishing machine;

FIG. 13 is a second state diagram during the connecting process of the mounting shaft and the main shaft of the second embodiment of the polishing machine;

FIG. 14 is a third state diagram during the connecting process of the mounting shaft and the main shaft of the second embodiment of the polishing machine;

FIG. 15 is a state diagram during a separating process of the mounting shaft and the main shaft of the second embodiment of the polishing machine;

FIG. 16 is a schematic diagram of an operating sleeve and the main shaft of the second embodiment of the polishing machine;

FIG. 17 is an exploded view of the operating sleeve, the limiting member, a support base, and the main shaft of the second embodiment of the polishing machine;

FIG. 18 is a sectional view of a second driving member of the second embodiment of the polishing machine;

FIG. 19 is a schematic diagram of a first structure of a working attachment and a working head;

FIG. 20 is an exploded view of the structure shown in FIG. 19;

FIG. 21 is a sectional view of the structure shown in FIG. 19;

FIG. 22 is a schematic diagram of a second structure of the working attachment and the working head;

FIG. 23 is an exploded view of the structure shown in FIG. 22;

FIG. 24 is a sectional view of the structure shown in FIG. 23;

FIG. 25 is a schematic diagram of a third embodiment of the polishing machine;

FIG. 26 is an internal schematic diagram of the third embodiment of the polishing machine;

FIG. 27 is a partial structural sectional view of the third embodiment of the polishing machine;

FIG. 28 is a sectional view when the limiting member in FIG. 27 is at a first position;

FIG. 29 is an enlarged view of portion A in FIG. 28;

FIG. 30 is a sectional view when the limiting member in FIG. 27 is at a second position;

FIG. 31 is an enlarged view of portion B in FIG. 30;

FIG. 32 is a sectional view when the mounting shaft is inserted into the main shaft but not locked in a fourth embodiment of the polishing machine;

FIG. 33 is a sectional view of a locked state of the mounting shaft and the main shaft in the fourth embodiment of the polishing machine;

FIG. 34 is a sectional view when the operating sleeve is operated in the fourth embodiment of the polishing machine;

FIG. 35 is a sectional view when the main shaft is ejected by the limiting member in the fourth embodiment of the polishing machine;

FIG. 36 is an exploded schematic diagram of a partial structure of the fourth embodiment of the polishing machine;

FIG. 37 is an exploded schematic diagram when the limiting member and the main shaft are assembled in the fourth embodiment of the polishing machine;

FIG. 38 is a schematic structural view of a polishing machine according to a first embodiment provided by the present application;

FIG. 39 is a schematic structural view of the polishing machine of FIG. 38 with a portion of its housing omitted;

FIG. 40 is a front view of the polishing machine of FIG. 38 with a portion of its housing omitted;

FIG. 41 is a schematic structural view of a main shaft, a motor, a transmission assembly, and a working attachment of the polishing machine in FIG. 40;

FIG. 42 is an exploded schematic structural view of the main shaft, the motor, the transmission assembly, and the working attachment of the polishing machine in FIG. 41;

FIG. 43 is an exploded schematic structural view of the main shaft, the motor, and the transmission assembly of the polishing machine in FIG. 41;

FIG. 44 is a front view of a portion of the structure of the polishing machine in FIG. 41;

FIG. 45 is a cross-sectional view taken from FIG. 44;

FIG. 46 is a cross-sectional view when a limiting member is in a first position;

FIG. 47 is an enlarged view of portion A in FIG. 46;

FIG. 48 is a cross-sectional view when the limiting member is in a second position;

FIG. 49 is an enlarged view of portion B in FIG. 48;

FIG. 50 is a cross-sectional view of an execution assembly;

FIG. 51 is a partial exploded schematic structural view of the execution assembly in FIG. 45;

FIG. 52 is a schematic structural view of the main shaft, an operation assembly, and the execution assembly in the first embodiment;

FIG. 53 is a bottom view of FIG. 52;

FIG. 54 is a first exploded schematic structural view of the main shaft, the operation assembly, and the execution assembly in FIG. 52;

FIG. 55 is a second exploded schematic structural view of the main shaft, the operation assembly, and the execution assembly in FIG. 52;

FIG. 56 is a third exploded schematic structural view of the main shaft, the operation assembly, and the execution assembly in FIG. 52;

FIG. 57 is a schematic structural view of the main shaft in FIG. 56;

FIG. 58 is a schematic structural view of an operation member in FIG. 56;

FIG. 59 is a schematic structural view of a guiding member and an inner ring gear in FIG. 56;

FIG. 60 is a schematic structural view of an outer ring gear in FIG. 56;

FIG. 61 is a schematic structural view of the limiting member in FIG. 56;

FIG. 62 is a cross-sectional view of the limiting member in FIG. 56;

FIG. 63 is a side view of the polishing machine in FIG. 38;

FIG. 64 is a bottom view of the polishing machine in FIG. 38;

FIG. 65 is a side view of a polishing machine according to another embodiment provided by the present application;

FIG. 66 is a side view of a polishing machine according to another embodiment provided by the present application;

FIG. 67 is a perspective view of a polishing machine according to another embodiment provided by the present application;

FIG. 68 is a top view of a lighting device in the embodiment of FIG. 67;

FIG. 69 is a side view of a polishing machine according to another embodiment provided by the present application;

FIG. 70 is an internal schematic view of the polishing machine of FIG. 69 with its left housing removed;

FIG. 71 is a partially enlarged view of the polishing machine in FIG. 69;

FIG. 72 is a partially enlarged view of region 106 in FIG. 70;

FIG. 73 is a schematic structural view of a light-emitting plate of the lighting device in FIG. 69;

FIG. 74 is a schematic view of the left housing of the polishing machine in FIG. 69;

FIG. 75 is a schematic installation diagram of an inner housing and the lighting device in FIG. 72;

FIG. 76 is a cross-sectional schematic view at a head housing in FIG. 71;

FIG. 77 is a schematic view of the lighting device in FIG. 75 from another perspective;

FIG. 78 is a cross-sectional view of the lighting device installed on the polishing machine;

FIG. 79 is a schematic view of another assembly manner of the execution assembly and the working attachment of the polishing machine;

FIG. 80 is an exploded schematic structural view of the components in FIG. 79;

FIG. 81 is a cross-sectional view of the structure in FIG. 79;

FIG. 82 is a cross-sectional view of an output member in FIG. 81;

FIG. 83 is a cross-sectional view of the working attachment in FIG. 81;

FIG. 84 is a cross-sectional view of the working attachment in FIG. 45;

FIG. 85 is a plan view illustrating a polishing machine according to an example;

FIG. 86 is a top view illustrating a main engine in FIG. 85;

FIG. 87 is a sectional view illustrating the main engine, a first execution assembly, a second execution assembly, and a third execution assembly in FIG. 85;

FIG. 88 is an enlarged view illustrating partial structure in FIG. 87, where a limiting member is in a first position;

FIG. 89 is a sectional view illustrating a main shaft, a driving member and the limiting member in FIG. 88 when the main shaft is installed with a first execution assembly;

FIG. 90 is an enlarged view illustrating some structures in FIG. 87, where the limiting member is in a second position;

FIG. 91 is a sectional view illustrating the main shaft, the driving member and the limiting member in FIG. 90 when the main shaft is installed with the first execution assembly;

FIG. 92 is a plan view illustrating the first execution assembly in FIG. 85;

FIG. 93 is a plan view illustrating the driving member in FIG. 87;

FIG. 94 is a plan view illustrating the main engine in FIG. 85 without a housing;

FIG. 95 is a perspective view illustrating the structure shown in FIG. 94;

FIG. 96 is an exploded view illustrating a motor and an air guiding cover in FIG. 95;

FIG. 97 is a perspective view illustrating the main engine in FIG. 85; and

FIG. 98 is an enlarged view illustrating partial region in FIG. 97.

DETAILED DESCRIPTION

Before any examples of this application are explained in detail, it is to be understood that this application is not limited to its application to the structural details and the arrangement of components set forth in the following description or illustrated in the above drawings.

In this application, the terms “comprising”, “including”, “having” or any other variation thereof are intended to cover an inclusive inclusion such that a process, method, article or device comprising a series of elements includes not only those series of elements, but also other elements not expressly listed, or elements inherent in the process, method, article, or device. Without further limitations, an element defined by the phrase “comprising a . . . ” does not preclude the presence of additional identical elements in the process, method, article, or device comprising that element.

In this application, the term “and/or” is a kind of association relationship describing the relationship between associated objects, which means that there can be three kinds of relationships. For example, A and/or B can indicate that A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character “/” in this application generally indicates that the contextual associated objects belong to an “and/or”relationship.

In this application, the terms “connection”, “combination”, “coupling” and “installation” may be direct connection, combination, coupling or installation, and may also be indirect connection, combination, coupling or installation. Among them, for example, direct connection means that two members or assemblies are connected together without intermediaries, and indirect connection means that two members or assemblies are respectively connected with at least one intermediate members and the two members or assemblies are connected by the at least one intermediate members. In addition, “connection” and “coupling” are not limited to physical or mechanical connections or couplings, and may include electrical connections or couplings.

In this application, it is to be understood by those skilled in the art that a relative term (such as “about”, “approximately”, and “substantially”) used in conjunction with quantity or condition includes a stated value and has a meaning dictated by the context. For example, the relative term includes at least a degree of error associated with the measurement of a particular value, a tolerance caused by manufacturing, assembly, and use associated with the particular value, and the like. Such relative term should also be considered as disclosing the range defined by the absolute values of the two endpoints. The relative term may refer to plus or minus of a certain percentage (such as 1%, 5%, 10%, or more) of an indicated value. A value that did not use the relative term should also be disclosed as a particular value with a tolerance. In addition, “substantially” when expressing a relative angular position relationship (for example, substantially parallel, substantially perpendicular), may refer to adding or subtracting a certain degree (such as 1 degree, 5 degrees, 10 degrees or more) to the indicated angle.

In this application, those skilled in the art will understand that a function performed by an assembly may be performed by one assembly, multiple assemblies one member, or multiple members. Likewise, a function performed by a member may be performed by one member, an assembly, or a combination of members.

In this application, the terms “up”, “down”, “left”, “right”, “front”, and “rear” and other directional words are described based on the orientation or positional relationship shown in the drawings, and should not be understood as limitations to the examples of this application. In addition, in this context, it also needs to be understood that when it is mentioned that an element is connected “above” or “under” another element, it can not only be directly connected “above” or “under” the other element, but can also be indirectly connected “above” or “under” the other element through an intermediate element. It should also be understood that orientation words such as upper side, lower side, left side, right side, front side, and rear side do not only represent perfect orientations, but can also be understood as lateral orientations. For example, lower side may include directly below, bottom left, bottom right, front bottom, and rear bottom.

The technical solutions involved in the present application are applied to power tools, and Embodiment 1 to Embodiment 4 are described using a polishing machine as an example. It should be noted that all technical solutions provided by the present application, in addition to being applicable to polishing machines, can also be applied to other types of power tools such as angle grinders, angle drills, electric drills, and screwdrivers.

As shown in FIGS. 1 to 4, the present application provides a polishing machine 10. The polishing machine 10 can be replaced with different working heads 400 and working attachments 900. Different working heads 400 and working attachments 900 can perform different operations on mechanical components, such as grinding and polishing operations. That is to say, the working attachment 900 may be a polishing attachment, a grinding attachment, a cutting attachment, or the like. In addition to the polishing machine 10, the technical solutions involved in the present application can also be applied to other angular power tools, such as angle grinders, angle drills, and angular wrenches.

Specifically, the polishing machine 10 includes a housing 100, a motor 200, a main shaft 300, a working head 400, a limiting member 500, and a locking mechanism 600. The housing 100 is a main installation component. An installation space is formed within the housing 100, and both the motor 200 and the main shaft 300 are disposed within the installation space. The motor 200 is a power component of the polishing machine 10. The main shaft 300 is drivably connected to a motor shaft of the motor 200. Under driving of the motor 200, the main shaft 300 is rotatable relative to the housing 100 around a first axis 101. The first axis 101 is a line shown as a dashed line in FIG. 3. The working head 400 includes a mounting shaft 410. The mounting shaft 410 can directly or indirectly mount the working attachment 900 and drive the working attachment 900 to rotate. The mounting shaft 410 is detachably connected to the main shaft 300, and rotation of the main shaft 300 drives rotation of the mounting shaft 410. The locking mechanism 600 and the limiting member 500 work together to achieve locking or unlocking of the mounting shaft 410 and the main shaft 300.

As shown in FIG. 1, the housing 100 has a split structure including a first half shell 110 and a second half shell 120 spliced together. The housing 100 with a split structure is easy to manufacture and assemble. The housing 100 is formed with a grip portion 130 and a mounting portion 140. The grip portion 130 is for gripping by a user. A user can operate the polishing machine 10 by gripping the grip portion 130 formed on the housing 100. The main shaft 300 is mounted within the mounting portion 140.

In some examples, a central axis of the mounting portion 140 and a central axis of the grip portion 130 are disposed at an angle. The motor 200 is mounted within an installation space corresponding to the grip portion 130. The main shaft 300 is mounted within an installation space corresponding to the mounting portion 140. A motor shaft of the motor 200 and the main shaft 300 are disposed at an angle. In one specific example, the motor shaft of the motor 200 and the main shaft 300 are disposed perpendicularly. When a user grips the polishing machine 10, the motor shaft of the motor 200 extends in a horizontal direction, the first axis 101 extends in a vertical direction, and the mounting portion 140 is formed with a downward opening.

Continuing to refer to FIGS. 1 to 15, the polishing machine 10 includes a limiting member 500. The limiting member 500 can limit movement of the mounting shaft 410 along the first axis 101. The limiting member 500 can be located at least at a first position and a second position. When the mounting shaft 410 is mounted to the main shaft 300 and is in a locked state, the limiting member 500 is at the first position. When the limiting member 500 is at the second position, the limiting member 500 allows the mounting shaft 410 to move along the first axis 101 to disengage from the main shaft 300. In the drawings, the limiting member 500 in FIGS. 6, 8, 12, and 14 is at the first position, and the limiting member 500 in FIGS. 7, 9, 11, and 13 is at the second position.

The polishing machine 10 further includes a locking mechanism 600. The locking mechanism 600 is disposed around the main shaft 300. During the connection of the mounting shaft 410 with the main shaft 300, the mounting shaft 410 activates the limiting member 500 and causes the limiting member 500 to move and directly lock. The locking mechanism 600 provides a space for the limiting member 500 to move. When the mounting shaft 410 is mounted to the main shaft 300, the locking mechanism 600 locks the limiting member 500 such that the limiting member 500 cannot move so that the mounting shaft 410 disengages from the main shaft 300. That is to say, except for the mounting shaft 410 directly contacting with the main shaft 300 to activate the limiting member 500 for locking, no additional operation is required to achieve a locking function. The use of the locking mechanism 600 can achieve a stable connection between the working head 400 and the main shaft 300, enabling the working head 400 to rotate synchronously with the main shaft 300. That is to say, the locking mechanism 600 and the limiting member 500 together achieve torque transmission between the mounting shaft 410 and the main shaft 300.

FIGS. 6 to 11 disclose a first embodiment of the polishing machine 10.

In the present embodiment, a limiting groove 411 is formed on the mounting shaft 410. During a process of the mounting shaft 410 being connected with the main shaft 300 from bottom to top, the limiting member 500 falls into the limiting groove 411 to lock a position of the mounting shaft 410. In some examples, the limiting member 500 is a limiting ball, the limiting groove 411 is an arc groove capable of limiting a portion of a sphere of the ball, and the limiting ball may be a steel ball or other metal ball with a high hardness. In some examples, a plurality of the limiting members 500 are provided. A plurality of the limiting members 500 are disposed at intervals around a circumference of the mounting shaft 410. Correspondingly, a plurality of the limiting grooves 411 are provided. A plurality of the limiting grooves 411 are arranged in an arc on the mounting shaft 410, and the plurality of the limiting members 500 can engage into the plurality of the limiting grooves 411 in a one-to-one correspondence.

To insert the mounting shaft 410 and mount the limiting member 500, an insertion hole for insertion of the mounting shaft 410 is provided along an axial direction at a connecting end of the main shaft 300, and an accommodating portion 301 is provided through the connecting end of the main shaft 300 in a radial direction. The accommodating portion 301 is used to mount the limiting member 500. In some examples, the accommodating portion 301 is an accommodating hole that penetrates a side wall of the main shaft 300 and communicates with the insertion hole. The limiting member 500 has an initial position where a portion protrudes into an insertion hole 421 to block the mounting shaft 410, and the limiting member 500 can move outward within the accommodating hole under an external force, enabling the limiting member 500 to move to a relief position that avoids the mounting shaft 410.

It should be noted that during a process of the mounting shaft 410 being inserted into the insertion hole of the main shaft 300 from bottom to top, the mounting shaft 410 gradually approaches the limiting member 500. After the mounting shaft 410 contacts the limiting member 500, the mounting shaft 410 may push the limiting member 500 so that the limiting member 500 move into the accommodating hole, thereby enabling the mounting shaft 410 to continue moving through the limiting member 500. When the limiting groove 411 moves to a position directly opposite the limiting member 500, the limiting member 500 can fall into the limiting groove 411 and be limited within the limiting groove 411, thereby achieving locking of the mounting shaft 410.

To enable the limiting member 500 to fall into the limiting groove 411 to lock the mounting shaft 410, in some examples, as shown in FIGS. 6 to 11, the polishing machine 10 further includes a pivoting pressing plate 614, a limiting sleeve 800, and an elastic member 810. The limiting sleeve 800 is movably fitted over the main shaft 300. A top of the limiting sleeve 800 forms a limiting portion that limits the limiting member 500 in the accommodating portion 301. The pivoting pressing plate 614 is located such that two ends of a pivot shaft of the pivoting pressing plate 614 respectively press against a top of the limiting member 500 and a top of the limiting sleeve 800 to form a seesaw structure. The elastic member 810 has a movement tendency to reset the limiting portion to a position that limits the limiting member 500 in the accommodating portion 301. And the limiting member 500 has an initial position where the limiting member 500 is limited within the accommodating portion 301, a relief position where the limiting member 500 is pushed by the mounting shaft 410 to leave the limiting portion and move to an upper side of the limiting portion, and a locking position where the limiting member 500 is engaged between the limiting portion and the limiting groove 411.

As shown in FIG. 6, an extension length of the accommodating hole in a direction parallel to the first axis 101 is greater than a radial dimension of the limiting member 500 in the direction parallel to the first axis 101, enabling the limiting member 500 to not only move in an axial direction of the accommodating hole, but also move in a radial direction of the accommodating hole.

A middle portion of the pivoting pressing plate 614 is provided with a first pivot shaft hole. A first pivot shaft passes through the first pivot shaft hole to rotatably connect the pivoting pressing plate 614 on an inner wall of the accommodating hole. The pivoting pressing plate 614 includes a first portion and a second portion located on two sides of the pivot shaft. The pivoting pressing plate 614 is located above the limiting member 500, and in an insertion direction of the mounting shaft 410, the first portion of the pivoting pressing plate 614 abuts against a top of the limiting member.

When the limiting member 500 moves in the insertion direction under a pushing action of the mounting shaft 410, the limiting member 500 can lift the first portion, causing the pivoting pressing plate 614 to rotate around the first pivot shaft in a counterclockwise direction as shown in FIG. 7. The counterclockwise direction is defined as a positive direction of rotation of the pivoting pressing plate 614. In some examples, a number of the pivoting pressing plates 614 is a plurality, and the plurality of the pivoting pressing plates 614 are disposed in one-to-one correspondence with the plurality of the limiting members 500.

When the pivoting pressing plate 614 rotates positively around the first pivot shaft, because the second portion of the pivoting pressing plate 614 presses against a top of the limiting sleeve 800 in the insertion direction of the mounting shaft 410, the limiting sleeve 800 can be pressed by the second portion to move in a direction away from the insertion direction, thereby causing the limiting portion of the limiting sleeve 800 to synchronously move downward. The upward moving limiting member 500 and the downward moving limiting portion are misaligned, and the limiting member 500 is pushed above the limiting portion under the pushing action of the mounting shaft 410. And because the downward moving limiting sleeve 800 can synchronously compress the elastic member 810, the elastic member 810 compresses to accumulate elastic potential energy. When the mounting shaft 410 moves to a position where the limiting groove 411 of the mounting shaft 410 is directly opposite the limiting member 500, the mounting shaft 410 releases pushing on the limiting member 500, and the elastic member 810 releases elastic potential energy to cause the limiting sleeve 800 to reset to an initial position. During a reset process, the limiting sleeve 800 can drive the pivoting pressing plate 614 to reset, and cause the limiting member 500 to be engaged in a locking position between the limiting portion and the limiting groove 411 as shown in FIG. 8.

To achieve unlocking of the mounting shaft 410 and the main shaft 300, enabling the working head 400 to be detached from the main shaft 300 for storage or replacement with other working heads 400, continuing to refer to FIG. 9, the locking mechanism 600 further includes a driving member and an operating sleeve 700 movably fitted over the main shaft 300. An operating driving portion 710 is disposed on the operating sleeve 700. The operating driving portion 710 can cause the driving member to move, thereby causing the limiting member 500 to disengage from the limiting groove 411. In the present example, the operating driving portion 710 is a part of the operating sleeve 700. In one example, the operating driving portion 710 may be molded separately from the operating sleeve 700 and then assembled together for use. In one example, a transmission structure may also be disposed between the operating driving portion 710 and the operating sleeve 700 to transmit a force, which is not limited here.

In some examples, the operating sleeve 700 is directly operated to remove the mounting shaft 410 from the main shaft 300. Of course, in other examples, the operating sleeve 700 may also be indirectly operated through other components, thereby enabling the mounting shaft 410 to be removed from the main shaft 300.

In some more specific examples, the operating sleeve 700 is moved in an up-down direction to remove the mounting shaft 410 from the main shaft 300. Of course, in other examples, the mounting shaft 410 may also be removed from the main shaft 300 by rotating the operating sleeve 700.

In some examples, the driving member is a first driving member 610, and the first driving member 610 rotationally drives the limiting member 500 to disengage from the limiting groove 411. The first driving member 610 includes a pivoting lifting plate 611. The operating sleeve 700 can drive the pivoting lifting plate 611 to rotate, and the rotating pivoting lifting plate 611 drives the pivoting pressing plate 614 to rotate in an opposite direction.

Continuing to refer to FIGS. 10 and 11, the first driving member 610 further includes two mounting plates 612 and a second pivot shaft 613. A limiting groove is formed on an inner wall surface of the operating sleeve 700. One end of the pivoting lifting plate 611 is disposed within the limiting groove, and another end of the pivoting lifting plate 611 presses against a limiting protrusion 801 formed on an outer wall surface of the limiting sleeve 800 from top to bottom. The two mounting plates 612 are mounted at a middle portion of the pivoting lifting plate 611 and are located on two sides of the mounting plates 612 disposed opposite to each other. Each mounting plate 612 is provided with a second pivot shaft hole. The second pivot shaft 613 passes through the two second pivot shaft holes and is connected within the housing 100.

As shown in FIG. 9, when a force is applied from bottom to top to move the operating sleeve 700 upward, one end of the pivoting lifting plate 611 that abuts against the operating sleeve 700 moves upward, causing the pivoting lifting plate 611 to rotate clockwise, and causing another end of the pivoting lifting plate 611 to push the limiting sleeve 800 downward by pressing against the limiting protrusion 801. During downward movement of the limiting sleeve 800, the elastic member 810 can be synchronously compressed, and the limiting portion of the limiting sleeve 800 synchronously moves downward to release pressing on the limiting member 500. At this time, by applying an external force downward on the mounting shaft 410, the mounting shaft 410 can push the limiting member 500 to move into a limiting hole, enabling the mounting shaft 410 to smoothly disengage from the main shaft 300. After stopping applying the external force to the operating sleeve 700, the elastic member 810 releases elastic potential energy, causing the limiting member 500, the limiting sleeve 800, the first driving member 610, and the operating sleeve 700 to reset to initial positions.

In some examples, the pivoting lifting plate 611 includes a first arc plate 6111 and a second arc plate 6112 connected to each other. The first arc plate 6111 is generally Z-shaped, and the second arc plate 6112 is generally semicircular. One end of the first arc plate 6111 is connected at a middle portion of the second arc plate 6112, and another end presses within the limiting groove. The limiting protrusion 801 is a ring protrusion, and the second arc plate 6112 is fitted over the limiting sleeve 800 and presses against the ring protrusion.

In some examples, a number of the first driving members 610 is two or more. A plurality of the first driving members 610 are disposed around a circumference of the limiting sleeve 800, and a plurality of the second arc plates 6112 simultaneously press against different positions of the ring protrusion.

FIGS. 12 to 18 disclose a second embodiment of the polishing machine 10.

Referring to FIGS. 12 to 18, to enable the limiting member 500 to fall into the limiting groove 411 to lock the mounting shaft 410, the driving member is a second driving member 620. The second driving member 620 achieves limiting of the limiting member 500, and the second driving member 620 translationally drives the limiting member 500 to disengage from the limiting groove 411.

As shown in FIG. 18, the second driving member 620 is a ring sleeve structure fitted over the main shaft 300. A relief groove 621 is formed on an inner side of the second driving member 620. The limiting member 500 has an initial position where the limiting member 500 is limited within the accommodating portion 301, a relief position where the limiting member 500 is pushed by the mounting shaft 410 to enter the relief groove 621, and a locking position where the limiting member 500 is engaged within the limiting groove 411.

Specifically, the second driving member 620 includes a first retaining portion 622 located on an upper side of the relief groove 621, a second retaining portion located on a lower side of the relief groove 621, and a third retaining portion located on an outer side of the relief groove 621. The first retaining portion 622 forms an inclined surface 623 on a side close to the relief groove 621. A diameter of the first retaining portion 622 is smaller than a diameter of the relief groove 621. Specifically, before the second driving member 620 is driven by the operating sleeve 700, the first retaining portion 622 abuts against an upper portion of the limiting member 500. In a direction from inside to outside of the second driving member 620, the inclined surface 623 slopes outward from top to bottom. The limiting member 500 can lift the second driving member 620 by moving on the inclined surface 623 and cause the limiting member 500 to enter the relief groove 621.

Continuing to refer to FIG. 17, the polishing machine 10 further includes an elastic return member 302 fitted over the main shaft 300. One end of the elastic return member 302 is fixedly disposed relative to the main shaft 300, and another end abuts against a top surface of the second driving member 620. During upward movement of the second driving member 620, the elastic return member 302 is compressed to accumulate elastic potential energy. When the limiting groove 411 on the mounting shaft 410 moves to a position directly opposite the limiting member 500, the elastic return member 302 releases elastic potential energy, causing the limiting member 500 to move in a direction of the limiting groove 411, ultimately causing the limiting member 500 to engage at a locking position between the limiting groove 411 and the first retaining portion 622.

To achieve unlocking of the mounting shaft 410 and the main shaft 300, enabling the working head 400 to be detached from the main shaft 300 for storage or replacement with other working heads 400, continuing to refer to FIG. 17, the polishing machine 10 further includes an operating sleeve 700 movably fitted over the main shaft 300. The operating sleeve 700 can drive the second driving member 620 to move, causing the limiting member 500 to disengage from the limiting groove 411.

In the related art, installing a working head requires at least a two-step operation. A user performs an operation on an operating sleeve (such as moving), the operating sleeve drives a locking mechanism to move, causing the locking mechanism to leave a space for the limiting member to move. Then the mounting shaft is extended into the main shaft to a specific position, and locking can only be achieved after releasing the operating sleeve.

In the polishing machine 10 provided by the present application, movement of the mounting shaft 410 drives the locking mechanism 600 to cause the locking mechanism 600 to allow the limiting member 500 to move from the first position to the second position. When the limiting member 500 moves to the limiting groove 411, a state change of the locking mechanism 600 locks the limiting member 500 in the limiting groove 411, thereby locking the mounting shaft 410 with the main shaft 300. That is to say, movement of the mounting shaft 410 alone can trigger the limiting member 500 to move from the first position to the second position. Therefore, a solution disclosed by the present application enables a user to complete connecting and locking of the mounting shaft 410 and the main shaft 300 with only one operation. Compared to a two-step operation, a one-step operation to complete assembly of the working head 400 simplifies operation steps for installing the working head 400 and improves an efficiency of replacing the working head 400.

In some specific examples, the operating sleeve 700 is directly operated to remove the mounting shaft 410 from the main shaft 300. Of course, in other examples, the operating sleeve 700 may also be indirectly operated through other components, thereby enabling the mounting shaft 410 to be removed from the main shaft 300.

In some more specific examples, the operating sleeve 700 is moved in an up-down direction to remove the mounting shaft 410 from the main shaft 300. Of course, in other examples, the mounting shaft 410 may also be removed from the main shaft 300 by rotating the operating sleeve 700.

Specifically, an abutting plate 624 is protruded on an outer wall surface of the second driving member 620. The operating sleeve 700 includes a driving portion formed below the abutting plate 624. In some examples, as shown in FIG. 17, a support base 701 for supporting the driving portion is further included.

When unlocking of the mounting shaft 410 is needed, as shown in FIG. 15, the operating sleeve 700 is driven to move from bottom to top. During movement of the operating sleeve 700, the driving portion abuts against the abutting plate 624 and drives the second driving member 620 to move upward, thereby causing the relief groove 621 to be disposed directly opposite the limiting member 500 again. At this time, a force is applied downward on the mounting shaft 410, and an outer wall surface of the mounting shaft 410 pushes the limiting member 500 to cause the limiting member 500 to enter the relief groove 621, thereby releasing locking of the mounting shaft 410 and enabling the mounting shaft 410 to smoothly disengage from the main shaft 300.

As shown in FIGS. 19 and 22, the working head 400 further includes an eccentric body 420 connected to the mounting shaft 410. The polishing machine 10 further includes a working attachment 900. In one example, the working attachment 900 is detachably connected on the eccentric body 420, and the eccentric body 420 is then connected to the mounting shaft 410. With such arrangement, when the mounting shaft 410 rotates, the eccentric body 420 can perform eccentric rotation relative to the mounting shaft 410, that is, the working attachment 900 performs eccentric rotation.

It should be noted that for any example of the present application, the working head 400 may only include the mounting shaft 410 and directly mount the working attachment 900 to the mounting shaft 410 for use, thereby achieving non-eccentric rotation of the working attachment 900. The eccentric body 420 may also be mounted to the mounting shaft 410 first, and then the working attachment 900 may be mounted to the eccentric body 420 for use, thereby achieving eccentric rotation of the working attachment 900.

To achieve a detachable connection between the working attachment 900 and the eccentric body 420, in some examples, as shown in FIGS. 19 to 21, the working attachment 900 includes a base plate 910 and a first adsorption member 930 connected to each other. A second adsorption member 430 is disposed on the eccentric body 420. The first adsorption member 930 and the second adsorption member 430 are adsorbed through a magnetic force of magnets.

In some specific examples, a mounting cavity is formed on the eccentric body 420. The second adsorption member 430 is disposed within the mounting cavity. The working attachment 900 is inserted into the mounting cavity to enable the first adsorption member 930 and the second adsorption member 430 to be adsorbed.

In some specific examples, the base plate 910 includes a shaft portion and a disk portion coaxially connected. A size of the shaft portion is smaller than a size of the disk portion. A stepped hole is provided within the shaft portion and the disk portion. The first adsorption member 930 includes a first plate portion, a rod portion, and a second plate portion connected in sequence. The second plate portion is disposed within the disk portion, the rod portion is disposed within the shaft portion, and the first plate portion abuts against a top plate of the shaft portion. The shaft portion and the first plate portion extend into the mounting cavity, causing the first plate portion to be adsorbed with the second adsorption member 430.

In some examples, the first adsorption member 930 and the second adsorption member 430 are magnets with opposite magnetic poles.

To achieve a detachable connection between the working attachment 900 and the eccentric body 420, in some parallel examples, as shown in FIGS. 22 to 24, the working attachment 900 includes an attachment mounting shaft 920. The attachment mounting shaft 920 is provided with a mounting hole 921 disposed in a radial direction. The polishing machine 10 further includes an elastic body 950 and an engaging ball 940 connected to the elastic body 950. The elastic body 950 is disposed within the mounting hole 921, and the engaging ball 940 at least partially protrudes from the mounting hole 921. An insertion hole 421 is disposed on the eccentric body 420. An engaging groove 422 is formed by inward recessing on an inner wall surface of the insertion hole 421. During a process of the attachment mounting shaft 920 being inserted into the insertion hole 421, the engaging ball 940 can engage into the engaging groove 422 to lock the attachment mounting shaft 920.

In some examples, the mounting hole 921 penetrates through the attachment mounting shaft 920. A number of the engaging balls 940 is two, and the two engaging balls 940 are respectively connected to two ends of the elastic body 950. Correspondingly, a number of the engaging grooves 422 is two, and the two engaging grooves 422 are respectively used to engage the two engaging balls 940.

FIGS. 25 to 31 disclose a third embodiment of the polishing machine.

A polishing machine 100a includes a main engine 10a. The main engine 10a includes a housing 11, a motor 12, a main shaft 300, and a transmission assembly 14. The motor 12 is disposed within the housing 11. The motor 12 has a stator, a rotor, and a motor shaft 121. The motor shaft 121 is rotatable around a motor axis 103. The main shaft 300 is rotatable relative to the housing 11 around a first axis 101. The transmission assembly 14 is used to transmit power between the motor shaft 121 and the main shaft 300. The main shaft 300 outputs power when rotating. The motor 12 is disposed within a motor housing 116. The motor housing 116 may be a part of the housing 11 or may be assembled together with the housing 11.

The transmission assembly 14 includes a first transmission wheel 141, a second transmission wheel 142, and a transmission belt 143. The first transmission wheel 141 is disposed on the motor shaft 121. The second transmission wheel 142 is disposed on the main shaft 300. The transmission belt 143 is drivably connected between the first transmission wheel 141 and the second transmission wheel 142. By adopting a transmission belt 143 transmission, a noise is improved, no gearbox is needed, therefore there is no oil leakage risk, and a failure rate is reduced. In one example, the transmission belt 143 may be a belt.

The housing 11 extends basically in a front-rear direction. The housing 11 includes a grip portion 111 for gripping by a user, a head housing 112 located at a front end of the grip portion 111, and a coupling portion 113 located at a rear end of the grip portion 111. The head housing 112 is used to accommodate the motor 12 and the main shaft 300. The coupling portion 113 is used to mount a battery pack 16. The battery pack 16 can supply power to the motor 12 after being connected to the housing 11. The grip portion 111 is basically perpendicular to the main shaft 300.

The polishing machine 100a further includes an inner housing 15. The inner housing 15 is disposed within the head housing 112 of the housing 11. The inner housing 15 is used to support the motor 12 and the main shaft 300. The motor shaft 121 is disposed through the inner housing 15 and is connected to the inner housing 15 through a first bearing 181. The main shaft 300 is disposed through the inner housing 15 and is connected to the inner housing 15 through a second bearing 182.

The polishing machine 100a further includes an operating switch 19 for controlling starting and stopping of the motor 12. The operating switch 19 is movably connected to the housing 11. The operating switch 19 is capable of moving at least to a first operating position and a second operating position relative to the housing 11. When the operating switch 19 is at the first operating position, the motor 12 rotates at a first rotational speed. When the operating switch 19 is at the second operating position, the motor 12 rotates at a second rotational speed. Both the first rotational speed and the second rotational speed are greater than zero. That is to say, the operating switch 19 can not only start and shut down the motor 12, but also adjust a rotational speed of the motor 12. In fact, the operating switch 19 can perform stepless speed regulation on the motor 12. The operating switch 19 is a stroke switch capable of moving relative to the housing 11 and having a plurality of positions corresponding to a plurality of rotational speeds of the motor 12. In the present example, the operating switch 19 is disposed at a front end of the grip portion 111, facilitating operation. The operating switch 19 slides basically in an up-down direction of the housing 11. When a user grips the grip portion 111, four fingers of a human hand bend, and an index finger is basically in contact with the operating switch 19. The user can press the operating switch 19 using the index finger.

The polishing machine 100a further includes a working head 400. The working head 400 is detachably connected to the main shaft 300. The working head 400 is used to connect a working attachment 900. Through a detachable manner, installation, detachment, and replacement of the working head 400 is facilitated. The working head 400 can have a plurality of types. When one working head 400 is detached, a user can connect another working head 400 to the main engine 10a. Different working heads 400 drive different working attachments 900 to move to achieve different functions. It can be understood that the functions can be one or more of sanding, polishing, and waxing. When a user needs to perform three processes of sanding, polishing, and waxing on a workpiece, the user only needs one polishing machine 100a to install different working heads 400 to complete these three processes, thereby facilitating a user operation, saving a cost, and improving a work efficiency.

In the present embodiment, the working head 400 includes a mounting shaft 410 and an eccentric body 420. The mounting shaft 410 is detachably connected to the main shaft 300. When the mounting shaft 410 is connected to the main shaft 300, the mounting shaft 410 can be driven by the main shaft 300 to rotate around the first axis 101. The eccentric body 420 is used to connect the working attachment 900. The eccentric body 420 and the mounting shaft 410 form a rotary connection. The eccentric body 420 can rotate relative to the mounting shaft 410 around a second axis 102. The second axis 102 is parallel to and spaced from the first axis 101. The polishing machine 100a further includes a mounting assembly 20. The mounting assembly 20 is used to detachably mount the working head 400 to the main shaft 300. The mounting assembly 20 includes an operating member 22. The operating member 22 is for operation by a user to enable the working head 400 to directly disengage from the main shaft 300, enabling a quick and convenient detachment. The mounting assembly 20 further includes a limiting member 500. The limiting member 500 is used to lock or release the working head 400. The limiting member 500 can move between a first position that prevents movement of the mounting shaft 410 relative to the main shaft 300 and a second position that allows movement of the mounting shaft 410 relative to the main shaft 300. The operating member 22 is for operation by a user to cause the limiting member 500 to disengage from the first position.

The working head 400 further includes an external gear ring 54. The external gear ring 54 is connected to the eccentric body 420 and can rotate with the eccentric body 420 around the second axis 102. The polishing machine 100a further includes an internal gear ring 115. The internal gear ring 115 is disposed around an outer circumference of the external gear ring 54 with the first axis 101 as an axis. A portion of the external gear ring 54 meshes with the internal gear ring 115.

When the mounting shaft 410 rotates around the first axis 101, the mounting shaft 410 drives the eccentric body 420 and the external gear ring 54 to revolve around the first axis 101. Because the external gear ring 54 meshes with the internal gear ring 115, the external gear ring 54 also rotates around the second axis 102 while revolving around the first axis 101. When the polishing machine 100a is started, under driving of the mounting shaft 410, the eccentric body 420 drives the external gear ring 54 and the working attachment 900 to revolve around the first axis 101. Simultaneously, because the external gear ring 54 meshes with the internal gear ring 115, an entirety formed by the external gear ring 54, the eccentric body 420, and the working attachment 900 rotates relative to the mounting shaft 410 around the second axis 102. That is to say, when the main engine 10a mounts the working head 400, regardless of whether the working attachment 900 contacts a workpiece, the working attachment 900 revolves around the first axis 101 and also rotates around the second axis 102.

Through meshing of the internal gear ring 115 and the external gear ring 54, the working attachment 900 of the polishing machine 100a performs an eccentric movement relative to the main shaft 300, and the eccentric movement is a forced eccentric movement, enabling the working attachment 900 to have a large swing amplitude during work. A contact area and an angle with a workpiece are more diverse, thereby improving a polishing efficiency.

In the present embodiment, a driving hole 131 centered on the first axis 101 is formed within the main shaft 300. The driving hole 131 is for insertion of the mounting shaft 410. The mounting shaft 410 includes a rotating shaft capable of being inserted into the driving hole 131. An accommodating hole 132 for accommodating the limiting member 500 is formed on a hole wall of the driving hole 131. The accommodating hole 132 penetrates through the driving hole 131 in a radial direction of the main shaft 300. The limiting member 500 can move within the accommodating hole 132 in the radial direction of the main shaft 300 to the first position and the second position.

A mating structure is formed on the mounting shaft 410. The mating structure is used to mate with the limiting member 500. Specifically, the mating structure formed on the mounting shaft 410 is a first groove 511, and the limiting member 500 is a sphere capable of partially embedding into the first groove 511. As shown in FIGS. 8 to 10, when the limiting member 500 is at the first position, a portion of the limiting member 500 extends into the driving hole 131 and embeds into the first groove 511. At this time, the limiting member 500 restricts sliding of the mounting shaft 410 in a direction of the first axis 101, thereby being able to prevent the mounting shaft 410 from disengaging from the main shaft 300 in the direction of the first axis 101. Similarly, when the limiting member 500 is at the first position, the limiting member 500 embeds into the first groove 511, and the limiting member 500 also restricts rotation of the mounting shaft 410 relative to the main shaft 300, thereby enabling the main shaft 300 to output power to the mounting shaft 410 through the limiting member 500 to drive the mounting shaft 410 to rotate around the first axis 101. As shown in FIGS. 11 and 12, when the limiting member 500 is at the second position, the limiting member 500 is located outside the driving hole 131, and the limiting member 500 also disengages from the first groove 511, so that the limiting member 500 no longer restricts sliding of the mounting shaft 410 in the direction of the first axis 101, thereby being able to allow the mounting shaft 410 to disengage from the main shaft 300 in the direction of the first axis 101.

A manner of operating the operating member 22 by a user may be rotation or sliding. In the present embodiment, when a user operates the operating member 22 to slide upward relative to the housing 11 along the first axis 101, the operating member 22 can drive the limiting member 500 to disengage from the first position. At this time, the user can detach the mounting shaft 410 from the main shaft 300. A portion of the operating member 22 is located outside the housing 11, facilitating a user operation, and a portion of the operating member 22 extends into the housing 11, facilitating mating with the limiting member 500.

The housing 11 further includes a guiding member 114. At least a portion of the operating member 22 is fitted over an outside of the guiding member 114. The guiding member 114 is configured to guide the operating member 22 to slide along the first axis 101. The internal gear ring 115 is disposed at a lower end of the guiding member 114. The internal gear ring 115 and the guiding member 114 may be disposed separately, or may be integrally molded. In the present embodiment, the internal gear ring 115 and the guiding member 114 are integrally molded, facilitating processing and production.

Specifically, the guiding member 114 is disposed at a lower end of the head housing 112, and an upper portion of the operating member 22 is fitted over an outside of the head housing 112. The guiding member 114 is made of a metal material. The guiding member 114 guides the operating member 22 to slide along the first axis 101, thereby making sliding of the operating member 22 smoother. The head housing 112 is made of plastic, and the guiding member 114 is a metal component. This avoids problems of unsmooth sliding of the operating member 22 and deformation or damage of the head housing 112 caused by directly guiding the operating member 22 through the head housing 112. The guiding member 114 is fixedly connected to the head housing 112, specifically through a bolt connection.

The operating member 22 is disposed around the first axis 101. The operating member 22 may be a sleeve. The operating member 22 is fitted over an outside of the guiding member 114, enabling the operating member 22 to slide relative to the head housing 112 in a direction of the first axis 101. Specifically, both the operating member 22 and the guiding member 114 are disposed around the first axis 101, and the guiding member 114 protrudes downward from the head housing 112. An outer diameter of the internal gear ring 115 is greater than an outer diameter of the guiding member 114 to form a stepped surface. The stepped surface is configured to limit a bottom end of the operating member 22.

The mounting assembly 20 further includes a first biasing member 23. The first biasing member 23 biases the operating member 22 to generate a biasing force that drives the operating member 22 to reset. The first biasing member 23 is a first spring fitted over an outside of the guiding member 114. The first spring is located between the head housing 112 and the operating member 22. One end of the first spring biases the head housing 112, and another end biases the operating member 22. Specifically, one portion of the first spring is fitted over the head housing 112, and another portion is fitted over an outside of the guiding member 114. Similarly, one portion of the operating member 22 is fitted over the head housing 112, and another portion is fitted over an outside of the guiding member 114.

The mounting assembly 20 further includes a second driving member 620 and a second biasing member 25. The second driving member 620 is used to contact the limiting member 500. The second biasing member 25 contacts the second driving member 620 to generate a biasing force that drives the limiting member 500 to move toward the first position.

The second driving member 620 is specifically a sleeve fitted on the main shaft 300. A driving surface 241 is formed on the second driving member 620. The second biasing member 25 is a second spring fitted on the main shaft 300. The second spring biases the second driving member 620 to drive the second driving member 620 to move toward a position where the driving surface 241 contacts the limiting member 500.

A contact portion 221 that contacts the second driving member 620 is further formed on the operating member 22. The contact portion 221 extends into the housing 11. When the operating member 22 slides upward, the contact portion 221 pushes the second driving member 620 upward to compress the second biasing member 25. At this time, the driving surface 241 no longer contacts the limiting member 500.

A second surface 242 is further formed on the second driving member 620. When the second driving member 620 moves upward until the second surface 242 aligns with the limiting member 500, the limiting member 500 is no longer pressed by the driving surface 241. At this time, the second driving member 620 allows the limiting member 500 to disengage from contact with the mounting shaft 410, thereby enabling a user to pull out the working head 400.

The mounting assembly 20 further includes an anti-slip member. The anti-slip member is fixedly disposed on an outer circumference of the operating member 22 to increase a friction force when contacting a user, facilitating the user operation. The anti-slip member may be made of a rubber material.

Referring to FIGS. 27 to 31, the polishing machine 100a further includes a reset assembly 30. The reset assembly 30 is disposed within the driving hole 131 (see FIG. 28) of the main shaft 300 and is located at an upper end of the working head 400. The reset assembly 30 is configured to keep the limiting member 500 at the second position when the working head 400 or the mounting shaft 410 disengages from the main shaft 300. When the working head 400 needs to be installed, the mounting shaft 410 can be directly inserted into the driving hole 131 of the main shaft 300, improving an assembly efficiency. Because the limiting member 500 is kept at the second position, no interference is caused to insertion of the mounting shaft 410 into the driving hole 131.

The reset assembly 30 includes an elastic member 31 and a return block 32. The return block 32 is slidingly connected to the driving hole 131. A limiting protrusion 133 is disposed on an inner wall of the driving hole 131. The elastic member 31 is disposed between the return block 32 and the limiting protrusion 133. When the working head 400 or the mounting shaft 410 disengages from the main shaft 300, the return block 32 moves to a position directly opposite the accommodating hole 132 to keep the limiting member 500 at the second position. The elastic member 31 provides an elastic force for downward movement of the return block 32.

When the mounting shaft 410 is inserted into the driving hole 131, the mounting shaft 410 compresses the return block 32, causing the elastic member 31 to be compressed until the first groove 511 on the mounting shaft 410 aligns with the accommodating hole 132, and the limiting member 500 embeds into the first groove 511 under an action of the second driving member 620. When detaching the working head 400, by sliding the operating member 22 to cause the limiting member 500 to disengage from the first position, the working head 400 can move relative to the main shaft 300. As the mounting shaft 410 disengages from the main shaft 300, the elastic member 31 pushes the return block 32 to move under an elastic restoring force, causing the return block 32 to move to a position directly opposite the accommodating hole 132, and the return block 32 abuts against the limiting member 500 to keep the limiting member 500 at the second position.

The reset assembly 30 further includes a support column 33. The return block 32 is connected to a lower end of the support column 33. The limiting protrusion 133 restricts a travel of the support column 33. When the mounting shaft 410 is inserted into the driving hole 131, the mounting shaft 410 compresses the return block 32, causing the elastic member 31 to be compressed. At this time, the support column 33 slides upward. When the working head 400 disengages from the main shaft 300, the support column 33 slides downward until abutting against the limiting protrusion 133. At this time, the elastic member 31 is still in a compressed state. The arrangement of the support column 33 can play a limiting role on the return block 32, causing the return block 32 to remain at a position directly opposite the accommodating hole 132.

Additionally, when detaching the working head 400, the elastic member 31 restores elasticity, and the return block 32 can apply an ejection force to the working head 400 that disengages from the main shaft 300, making the working head 400 more convenient to detach.

FIGS. 32 to 37 disclose a fourth embodiment of the polishing machine.

The fourth embodiment has a same principle as the third embodiment, with a difference being in a connection manner between the return block 32 and the main shaft 300. Components with same reference numerals in FIGS. 32 to 37 as those in the previous first embodiment, second embodiment, and third embodiment have same functions and will not be described one by one here. Only differences between the fourth embodiment and the third embodiment will be described in detail.

The main shaft 300 contains a hollow accommodating cavity. A top of the accommodating cavity is sealed, and a bottom is open. An elastic member 31 is disposed between the top of the accommodating cavity and the return block 32. The return block 32 is connected to the main shaft 300 through a positioning pin 33. The return block 32 has a through hole 321 that penetrates therethrough. The main shaft 300 is provided with through slots 310. The positioning pin 33 passes through the through hole 321 and the slots 310, enabling two ends of the positioning pin 33 to slide within the two slots 310.

As shown in FIGS. 32 to 35, when the mounting shaft 410 is inserted into the main shaft 300 from bottom to top, the mounting shaft 410 pushes the return block 32 to move upward. When the mounting shaft 410 moves upward until the limiting member 500 enters the accommodating portion 301, the mounting shaft 410 is restricted by the limiting member 500 and cannot continue moving upward, achieving locking of the mounting shaft 410. At this time, the operating sleeve 700 is moved upward, a sleeve driving portion 710 drives the second driving member 620 to move upward, the elastic member 31 drives the return block 32 to move downward, and simultaneously the limiting member 500 is pushed into the relief groove 621, enabling the main shaft 300 to be smoothly removed. When detaching the working head 400, the return block 32 can apply an ejection force to the working head 400 that disengages from the main shaft 300, making the working head 400 more convenient to detach.

It should be supplemented that for all technical solutions of the present application, a rotational speed of the main shaft 300 is greater than or equal to 500 RPM and less than or equal to 8000 RPM, that is to say, a rotational speed of the mounting shaft 410 and the working head 400 is greater than or equal to 500 RPM and less than or equal to 8000 RPM. In some examples, a rotational speed of the power tool is greater than or equal to 2000 RPM and less than or equal to 8000 RPM. In some examples, a rotational speed of the power tool is greater than or equal to 3000 RPM and less than or equal to 8000 RPM. A series of technical solutions of the present application enables the mounting shaft 410 to not easily disengage from the main shaft 300 when the working attachment rotates at a high speed, that is to say, a mating between the mounting shaft 410 and the main shaft 300 in a direction of the first axis 101 is relatively stable. With such arrangement, when the working head 400 rotates at a high speed, a vibration generated by an entire power tool is relatively small.

FIGS. 38 to 62 illustrates a new embodiment of a polishing machine 100a. It should be noted that, the locking mechanism of the present polishing machine 100a is same with the locking mechanism of the third embodiment of the polishing machine shown in FIGS. 25-31. It could also be understood that the first embodiment to the fourth embodiment described in FIGS. 1-37 can all be used in the subsequent embodiment in FIGS. 38 to 62.

As shown in FIG. 38 to FIG. 45, the polishing machine 100a comprises a main unit 10a, the main unit 10a comprises a housing 11, a motor 12, a main shaft 13 and a transmission assembly 14, the motor 12 is arranged in the housing 11, the motor 12 has a stator, a rotor and a motor shaft 121, the motor shaft 121 can rotate around a motor axis 103'. The main shaft 13 is capable of rotating around a first axis 101 relative to the housing 11, the transmission assembly 14 is arranged to transfer power between the motor shaft 121 and the main shaft 13, and the main shaft 13 outputs power when rotating. The motor 12 is arranged in a motor housing 116, the motor housing 116 can be a part of the housing 11, or can be assembled with the housing 11.

The transmission assembly 14 comprises a first transmission wheel 141, a second transmission wheel 142 and a transmission belt 143, the first transmission wheel 141 is arranged on the motor shaft 121, the second transmission wheel 142 is arranged on the main shaft 13, and the transmission belt 143 is drivingly connected to the first transmission wheel 141 and the second transmission wheel 142. By using the transmission belt 143 for a transmission, a noise is improved, a gear box is not required, therefore there is no oil leakage risk, and a failure rate is reduced. In an embodiment, the transmission belt 143 may be a belt.

A transmission ratio of the transmission assembly 14 is between 1-15. In some embodiments, the transmission ratio of the transmission assembly 14 is between 1-10. In some embodiments, the transmission ratio of the transmission assembly 14 is approximately 3, 4, 5, 6, 7 or 8.

A maximum speed of the motor 12 is less than or equal to 35000 RPM. In some embodiments, the maximum speed of the motor 12 is greater than or equal to 15000 RPM and less than or equal to 35000 RPM. In some embodiments, the maximum speed of the motor 12 is 18000 RPM, 20000 RPM, 23000 RPM, 25000 RPM or 27000 RPM.

A maximum output power of the motor 12 is greater than or equal to 250 W. In some embodiments, the maximum output power of the motor 12 is 250 W, 300 W, 350 W, 400 W, 450 W or 500 W.

An angle γ is formed between the motor axis 103′ and the first axis 101 of the main shaft 13. In the present embodiment, the angle γ is substantially zero. In some embodiments, the angle γ is less than or equal to 30 degrees. In some embodiments, the angle γ is less than or equal to 15 degrees. In some embodiments, the angle γ is 5 degrees, 10 degrees, 15 degrees, 20 degrees or 25 degrees.

In the present embodiment, the motor axis 103′ is substantially parallel to the first axis 101 of the main shaft 13. That is to say, the main shaft 13 extends along an up-down direction of the housing 11, and the motor axis 103′ substantially extends along the up-down direction. A lower end of the main shaft 13 is arranged to mount a working attachment 900, and the working attachment 900 may be one of working attachments such as a polishing sponge, a polishing disc, a sandpaper, a grinding disc, a screwdriver bit, a cutter head, and a drill bit. When the working attachment 900 is a rotation member that completes a work through a rotation, a rotation axis of the working attachment 900 coincides with or is substantially parallel to the first axis 101; when the working attachment 900 is a reciprocating motion member that completes a work through a reciprocating motion, a motion direction of the reciprocating motion of the working attachment 900 coincides with or is substantially parallel to the first axis 101. The transmission assembly 14 may be arranged above the motor 12, or may be arranged below the motor 12. When the transmission assembly 14 is arranged above the motor 12, a layout is more reasonable, and a space is fully utilized.

The housing 11 substantially extends along a front-back direction. The housing 11 comprises a grip portion 111 arranged for a user to grip, a head housing at a front end of the grip portion 111 and a coupling portion 113 at a rear end of the grip portion 111. The head housing 112 may accommodate the motor 12 and the main shaft 13, the coupling portion 113 may mount a battery pack 16, and the battery pack 16 is capable of supplying power to the motor 12 after being connected to the housing 11. The grip portion 111 is substantially perpendicular to the main shaft 13.

The polishing machine 100a further comprises an inner housing 15, the inner housing 15 is arranged in the head housing 112 of the housing 11, and the inner housing 15 is arranged to support the motor 12 and the main shaft 13. The motor shaft 121 extends through the inner housing 15 and is connected to the inner housing 15 through a first bearing 181, and the main shaft 13 extends through the inner housing 15 and is connected to the inner housing 15 through a second bearing 182.

As shown in FIG. 38 to FIG. 40, a circuit board 17 is further arranged in the housing 11, and the motor 12 comprises an output line 122 arranged to be electrically connected to the circuit board 17. The circuit board 17 may be arranged at the coupling portion 113, or may be located between the grip portion 111 and the coupling portion 113. The output line 122 substantially extends in the grip portion 111.

The polishing machine 100a further comprises an operation switch 19 arranged to control a start and a stop of the motor 12, the operation switch 19 is movably connected to the housing 11, and the operation switch 19 is capable of moving relative to the housing 11 to at least a first operation position and a second operation position. The operation switch 19 substantially slides along the up-down direction of the housing 11. When a user grips the grip portion 111, four fingers of a hand are bent, an index finger roughly contacts the operation switch 19, and the user may press the operation switch 19 by using the index finger.

When the operation switch 19 is at the first operation position, the motor 12 rotates at a first speed, when the operation switch 19 is at the second operation position, the motor 12 rotates at a second speed, and the first speed and the second speed are both greater than zero. That is to say, the operation switch 19 not only is capable of starting and closing the motor 12, but also is capable of adjusting a speed of the motor 12. In the present embodiment, the operation switch 19 is capable of performing a stepless speed regulation on the motor 12, the operation switch 19 is a stroke switch, is capable of moving relative to the housing 11 and has a plurality of positions corresponding to a plurality of speeds of the motor 12. In the present embodiment, the operation switch 19 is arranged at the front end of the grip portion 111, for a convenient operation. In some other embodiments, the operation switch 19 may also comprise other forms, such as a push-twist, etc., and the operation switch 19 may also be arranged to have a plurality of operation positions. This part is a known technology, and details are not described herein again.

As shown in FIG. 45 to FIG. 62, the polishing machine 100a further comprises an execution assembly 50, the execution assembly 50 is detachably connected to the main shaft 13, and the execution assembly 50 is arranged to connect the working attachment 900. Through a detachable manner, an installation, a removal and a replacement of the execution assembly 50 are facilitated. There may be a plurality of execution assemblies 50. When one execution assembly 50 is removed, a user may connect another execution assembly 50 to the main unit 10a. Different execution assemblies 50 drive different working attachments 60 to move to achieve different functions. It can be understood that, the functions may be one or more of a grinding, a polishing and a waxing. When a user needs to perform three processes of the grinding, the polishing and the waxing on a workpiece, the user only needs one polishing machine 100a to install different execution assemblies 50 to complete the three processes, thereby facilitating an operation of the user, saving a cost, and improving a working efficiency.

As shown in FIG. 45, the main shaft 13 comprises a first main shaft end 1301 and a second main shaft end 1302 arranged at two ends along the first axis 101. In a coordinate system shown in FIG. 38, the first main shaft end 1301 is located above the second main shaft end 1302, and the first main shaft end 1301 is closer to the second transmission wheel 142 than the second main shaft end 1302. When the polishing machine 100a is installed with the working attachment 900, the second main shaft end 1302 is closer to the working attachment 900 than the first main shaft end 1301.

The motor 12 comprises a first motor end 1201 and a second motor end 1202 arranged at two ends of the motor 12 along the motor axis 103′, the first motor end 1201 is also a driving end where the motor 12 is connected to the first transmission wheel 141, that is an output end of the motor shaft 121, and the second motor end 1202 is farther from the first transmission wheel 141 compared to the first motor end 1201.

The rotor of the motor 12 and the second main shaft end 1302 of the main shaft 13 are located on a same side of the transmission belt 143. The rotor of the motor 12 and the execution assembly 50 are located on the same side of the transmission belt 143. The second motor end 1202 of the motor 12 and the second main shaft end 1302 of the main shaft 13 are located on the same side of the transmission belt 143. In the coordinate system shown in FIG. 38, both the second main shaft end 1302 and the second motor end 1202 are located below the transmission belt 143.

As shown in FIG. 45 to FIG. 51, the execution assembly 50 comprises a rotation member 51 and an output member 52, the rotation member 51 is detachably connected to the main shaft 13, and the rotation member 51 is capable of being driven by the main shaft 13 to rotate around the first axis 101 when connected to the main shaft 13. The output member 52 is directly connected to the working attachment 900, the output member 52 and the rotation member 51 form a rotational connection, the output member 52 is capable of rotating around a second axis 102 relative to the rotation member 51, and the second axis 102 is parallel to and spaced from the first axis 101.

The polishing machine 100a further comprises a mounting assembly 20, and the mounting assembly 20 is arranged to detachably mount the execution assembly 50 to the main shaft 13. The mounting assembly 20 comprises an operation member 22, and the operation member 22 is arranged for a user to operate to enable the execution assembly 50 to directly disengage from the main shaft 13, and a removal is quick and convenient. The mounting assembly 20 further comprises a limiting member 21, and the limiting member 21 is arranged to lock or release the execution assembly 50. The limiting member 21 is capable of moving between a first position for preventing a movement of the rotation member 51 relative to the main shaft 13 and a second position for allowing a movement of the rotation member 51 relative to the main shaft 13, and the operation member 22 is arranged for a user to operate to enable the limiting member 21 to disengage from the first position.

With reference to FIG. 52 to FIG. 56, the execution assembly 50 further comprises an outer ring gear 54, the outer ring gear 54 is connected to the output member 52 and is capable of rotating around the second axis 102 with the output member 52. In the present embodiment, the outer ring gear 54 is fitted on an exterior of the output member 52, a shape of an opening of the outer ring gear 54 is consistent with a shape of the output member 52, so that when the output member 52 rotates, the outer ring gear 54 rotates together with the output member 52. The polishing machine 100a further comprises an inner ring gear 115, the inner ring gear 115 is arranged around an outer periphery of the outer ring gear 54 with the first axis 101 as an axis, and when the outer ring gear 54 rotates in the inner ring gear 115, a portion of the outer ring gear 54 meshes with the inner ring gear 115.

When the rotation member 51 rotates around the first axis 101, the rotation member 51 drives the output member 52 and the outer ring gear 54 to revolve around the first axis 101. Because the outer ring gear 54 meshes with the inner ring gear 115, the outer ring gear 54 also rotates around the second axis 102 while revolving around the first axis 101. When the polishing machine 100a is started, under a driving of the rotation member 51, the output member 52 drives the outer ring gear 54 and the working attachment 900 to revolve around the first axis 101. Meanwhile, because the outer ring gear 54 meshes with the inner ring gear 115, an entirety formed by the outer ring gear 54, the output member 52 and the working attachment 900 rotates around the second axis 102 relative to the rotation member 51. That is to say, when the main unit 10a is installed with the execution assembly 50, regardless of whether the working attachment 900 contacts a workpiece, the working attachment 900 also rotates around the second axis 102 while revolving around the first axis 101.

Through a meshing of the inner ring gear 115 and the outer ring gear 54, the working attachment 900 of the polishing machine 100a performs an eccentric movement relative to the main shaft 13, and at this time the eccentric movement is a forced eccentric rotation. Such an arrangement enables the working attachment 900 to have a large swing amplitude during an operation, and areas and angles of contact with a workpiece are more abundant and diverse, thereby improving a polishing efficiency. The forced eccentric rotation polishing machine 100a can reduce a local overheating when processing a material, and lower a temperature of a workpiece surface after a polishing. Particularly for a car paint polishing, a paint surface damage or a hot touch phenomenon caused by a high temperature can be avoided. Safety is good, which helps a novice operation, reduces a risk of an excessive polishing caused by an improper operation, and a glare phenomenon during a polishing process is also relatively less. Therefore, the forced eccentric rotation polishing machine 100a ensures a polishing quality while improving a working efficiency, and has relatively low skill requirements for an operator, and is particularly suitable for an automotive beauty industry and industrial fields with high surface treatment requirements.

In the present embodiment, as shown in FIG. 45, a distance L1 between the second axis 102 and the first axis 101 (that is, an eccentric distance of the polishing machine 100a) is greater than or equal to 1 millimeter and less than or equal to 6 millimeters. When a maximum outer diameter d of the working attachment 900 (see FIG. 64) is greater than or equal to 3 inches, and less than or equal to 6 inches, the eccentric distance L1 of the polishing machine 100a is greater than or equal to 6 mm and less than or equal to 10 mm. When the maximum outer diameter d of the working attachment 900 is less than 3 inches, the eccentric distance L1 of the polishing machine 100a is greater than or equal to 2 mm and less than or equal to 6 mm. A transmission ratio between the inner ring gear 115 and the outer ring gear 54 is between 4-6. A diameter of a pitch circle of the inner ring gear 115 is between 20-25. In some embodiments, the diameter of the pitch circle of the inner ring gear 115 is 21.3 mm, the distance L1 between the second axis 102 and the first axis 101 is equal to 3 millimeters, the transmission ratio between the inner ring gear 115 and the outer ring gear 54 is approximately 6, and a tooth number ratio of the inner ring gear 115 and the outer ring gear 54 is 40/34.

The output member 52 and the rotation member 51 form a rotational connection, a bearing is arranged between the output member 52 and the rotation member 51, and the bearing is fitted on the output member 52 and limited by a snap ring 55. The snap ring 55 has an elasticity, for a convenient installation and a convenient removal. The rotation member 51 has a rod-shaped shaft portion 513, and the shaft portion 513 is inserted into the main shaft 13. In the present embodiment, a counterweight 53 is further connected to the rotation member 51, thereby improving a balance of the polishing machine 100a when the execution assembly 50 is installed.

The output member 52 comprises a first connection portion 521 arranged to connect the working attachment 900, and the first connection portion 521 is a hole or a post centered on the second axis 102. The working attachment 900 and the first connection portion 521 can be threadedly connected.

In some embodiments, the outer ring gear 54 and the output member 52 are integrally formed. Specifically, the output member 52 can be embedded in the outer ring gear 54, and integrally formed by an injection molding. In some embodiments, the outer ring gear 54 and the output member 52 are detachably connected, and can be a snap connection or a bolt connection. In the present embodiment, as shown in FIG. 50, FIG. 51 and FIG. 61, the outer ring gear 54 and the output member 52 are snap-connected. The output member 52 comprises a second connection portion 522 arranged to connect the outer ring gear 54, a card groove 5221 is arranged on an outer peripheral surface of the second connection portion 522, the outer ring gear 54 has a mounting hole 541 capable of engaging with the second connection portion 522, and a mounting protrusion 542 is arranged on an inner wall of the mounting hole 541. During an installation, the outer ring gear 54 is fitted on the second connection portion 522, so that the mounting protrusion 542 snaps into the card groove 5221 to limit the outer ring gear 54. For a convenient connection, the outer ring gear 54 can be arranged as a plastic part, to rely on an own elasticity of the outer ring gear 54 to enable the mounting protrusion 542 to snap into the card groove 5221.

In the present embodiment, the mounting hole 541 is a waist-shaped hole, and the second connection portion 522 is a waist-shaped post structure adapted to the mounting hole 541, to prevent the outer ring gear 54 from rotating relative to the output member 52, so that the outer ring gear 54 rotates synchronously with the output member 52. In other embodiments, the mounting hole 541 may also be an elongated hole.

In the present embodiment, a driving hole 131 centered on the first axis 101 is formed in the main shaft 13, the driving hole 131 is for the rotation member 51 to be inserted, and the rotation member 51 comprises a rotation shaft capable of being inserted into the driving hole 131. An accommodating hole 132 arranged to accommodate the limiting member 21 is formed on a hole wall of the driving hole 131, the accommodating hole 132 extends through the driving hole 131 along a radial direction of the main shaft 13, and the limiting member 21 is capable of moving to the first position and the second position in the accommodating hole 132 along the radial direction of the main shaft 13.

A mating structure is formed on the rotation member 51, and the mating structure is arranged to engage with the limiting member 21. Specifically, the mating structure formed on the rotation member 51 is a first groove 511, and the limiting member 21 is a sphere capable of being partially embedded into the first groove 511. As shown in FIG. 45 to FIG. 47, when the limiting member 21 is at the first position, a portion of the limiting member 21 extends into the driving hole 131 and is embedded into the first groove 511. At this time, the limiting member 21 restricts a sliding of the rotation member 51 along a direction of the first axis 101, thereby being able to prevent the rotation member 51 from disengaging from the main shaft 13 along the direction of the first axis 101. Similarly, when the limiting member 21 is located at the first position, the limiting member 21 is embedded in the first groove 511, the limiting member 21 also restricts a rotation of the rotation member 51 relative to the main shaft 13, so that the main shaft 13 is capable of outputting power to the rotation member 51 through the limiting member 21 to drive the rotation member 51 to rotate around the first axis 101. As shown in FIG. 48 and FIG. 49, when the limiting member 21 is located at the second position, the limiting member 21 is located outside the driving hole 131, the limiting member 21 also disengages from the first groove 511, so that the limiting member 21 no longer restricts the sliding of the rotation member 51 along the direction of the first axis 101, thereby being able to allow the rotation member 51 to disengage from the main shaft 13 along the direction of the first axis 101.

A manner for a user to operate the operation member 22 can be a rotation or a sliding. In the present embodiment, when the user operates the operation member 22 to slide upward relative to the housing 11 along the first axis 101, the operation member 22 is able to drive the limiting member 21 to disengage from the first position. At this time, the user can remove the rotation member 51 from the main shaft 13. A portion of the operation member 22 is located outside the housing 11, for a convenient operation by the user, and a portion of the operation member 22 extends into the housing 11, for a convenient engagement with the limiting member 21.

The housing 11 further comprises a guiding member 114, at least a portion of the operation member 22 is fitted on an outer side of the guiding member 114, the guiding member 114 is arranged to guide the operation member 22 to slide along the first axis 101, and the inner ring gear 115 is arranged at a lower end of the guiding member 114. The inner ring gear 115 and the guiding member 114 can be separately arranged, or can be integrally formed. In the present embodiment, the inner ring gear 115 and the guiding member 114 are integrally formed, for a convenient processing and a convenient production.

Specifically, the guiding member 114 is arranged at a lower end of the head housing 112, and an upper portion of the operation member 22 is fitted on an outer side of the head housing 112. The guiding member 114 is made of a metal material, and the guiding member 114 guides the operation member 22 to slide along the first axis 101, thereby making a sliding of the operation member 22 smoother. The head housing 112 is made of a plastic, and the guiding member 114 is a metal part, thus avoiding a problem of a non-smooth sliding of the operation member 22 and a deformation or a damage of the head housing 112 caused by directly guiding the operation member 22 through the head housing 112. The guiding member 114 is fixedly connected to the head housing 112, specifically through a bolt connection.

The operation member 22 is arranged around the first axis 101, the operation member 22 is a sleeve, and the operation member 22 is fitted on an outer side of the guiding member 114, so that the operation member 22 is able to slide relative to the head housing 112 along a direction of the first axis 101. Specifically, both the operation member 22 and the guiding member 114 are arranged around the first axis 101, and the guiding member 114 protrudes downward from the head housing 112. An outer diameter of the inner ring gear 115 is larger than an outer diameter of the guiding member 114 to form a stepped surface, and the stepped surface is arranged to limit a bottom end of the operation member 22.

The mounting assembly 20 further comprises a first biasing element 23, and the first biasing element 23 biases the operation member 22 to generate a biasing force that drives the operation member 22 to reset. The first biasing element 23 is a first spring fitted on an outer side of the guiding member 114, the first spring is located between the head housing 112 and the operation member 22, one end of the first spring biases the head housing 112, and another end biases the operation member 22. Specifically, a portion of the first spring is fitted on the head housing 112, and another portion is fitted on the outer side of the guiding member 114. Similarly, a portion of the operation member 22 is fitted on the head housing 112, and another portion is fitted on the outer side of the guiding member 114.

The mounting assembly 20 further comprises a driving member 24 and a second biasing element 25, the driving member 24 is arranged to contact the limiting member 21, and the second biasing element 25 contacts the driving member 24 to generate a biasing force that drives the limiting member 21 to move toward the first position.

The driving member 24 is specifically a sleeve fitted on the main shaft 13, and a driving surface 241 is formed on the driving member 24. The second biasing element 25 is a second spring fitted on the main shaft 13, and the second spring biases the driving member 24 to drive the driving member 24 to move toward a position where the driving surface 241 contacts the limiting member 21.

A contact portion 221 that contacts the driving member 24 is further formed on the operation member 22, and the contact portion 221 extends into the housing 11. When the operation member 22 slides upward, the contact portion 221 pushes the driving member 24 upward to compress the second biasing element 25, and at this time the driving surface 241 no longer contacts the limiting member 21.

A second surface 242 is further formed on the driving member 24. When the driving member 24 moves upward until the second surface 242 is aligned with the limiting member 21, the limiting member 21 is no longer pressed by the driving surface 241, and at this time the driving member 24 allows the limiting member 21 to disengage from a contact with the rotation member 51, so that at this time a user can pull out the execution assembly 50.

A first annular groove 512 is further formed on the rotation member 51 (see FIG. 51), the first annular groove 512 surrounds the first axis 101, and the first groove 511 is arranged in the first annular groove 512. The first groove 511 is further recessed toward the first axis 101 relative to the first annular groove 512, and a number of the first grooves 511 is a plurality. In some embodiments, the number of the first grooves 511 is four or six. In this way, when the rotation member 51 is inserted into the driving hole 131, the first groove 511 may not be aligned with the limiting member 21, and the limiting member 21 may be first inserted into the first annular groove 512. At this time, the limiting member 21 contacts the first annular groove 512 and a third surface 243 formed by the driving member 24 respectively, the rotation member 51 will not disengage from the main shaft 13 along a direction of the first axis 101, but the rotation member 51 can still rotate a certain angle relative to the main shaft 13. Then, when a user rotates the rotation member 51 or the motor 12 is started, the limiting member 21 will move into the first groove 511, so that the rotation member 51 cannot rotate relative to the main shaft 13. The third surface 243 is arranged between the driving surface 241 and the second surface 242, a distance between the third surface 243 and the first axis 101 is greater than a distance between the driving surface 241 and the first axis 101, and the distance between the third surface 243 and the first axis 101 is also less than a distance between the second surface 242 and the first axis 101.

Referring to FIG. 51, the mounting assembly 20 further comprises a non-slip member 26, and the non-slip member 26 is fixedly arranged on an outer periphery of the operation member 22 to increase a friction when contacting a user, for a convenient operation by the user. The non-slip member 26 can be made of a rubber material.

Referring to FIG. 45 to FIG. 49, the polishing machine 100a further comprises a reset assembly 30, the reset assembly 30 is arranged in the driving hole 131 of the main shaft 13 and located at an upper end of the execution assembly 50, and the reset assembly 30 is arranged to keep the limiting member 21 at the second position when the execution assembly 50 disengages from the main shaft 13. When the execution assembly 50 needs to be installed, the rotation member 51 can be directly inserted into the driving hole 131 of the main shaft 13, improving an assembly efficiency. Because the limiting member 21 is kept at the second position, an interference with an insertion of the rotation member 51 into the driving hole 131 will not be caused.

The reset assembly 30 comprises an elastic member 31 and a return block 32, the return block 32 is slidably connected to the driving hole 131, a limiting protrusion 133 is arranged on an inner wall of the driving hole 131, the elastic member 31 is arranged between the return block 32 and the limiting protrusion 133, and when the execution assembly 50 disengages from the main shaft 13, the return block 32 moves to a position opposite to the accommodating hole 132 to keep the limiting member 21 at the second position.

When the rotation member 51 is inserted into the driving hole 131, the rotation member 51 will press the return block 32, so that the elastic member 31 is compressed, until the first groove 511 on the rotation member 51 is aligned with the accommodating hole 132, and the limiting member 21 is embedded in the first groove 511 under an action of the driving member 24. When removing the execution assembly 50, by sliding the operation member 22, the limiting member 21 is made to disengage from the first position, and the execution assembly 50 is able to move relative to the main shaft 13. As the rotation member 51 disengages from the main shaft 13, the elastic member 31 pushes the return block 32 to move under an action of an elastic restoring force, so that the return block 32 moves to a position opposite to the accommodating hole 132, and the return block 32 abuts the limiting member 21 to keep the limiting member 21 at the second position.

The reset assembly 30 further comprises a supporting post 33, the return block 32 is connected to a lower end of the supporting post 33, and the limiting protrusion 133 limits a stroke of the supporting post 33. When the rotation member 51 is inserted into the driving hole 131, the rotation member 51 will press the return block 32, so that the elastic member 31 is compressed, and at this time the supporting post 33 will slide upward. When the execution assembly 50 disengages from the main shaft 13, the supporting post 33 slides downward until the supporting post 33 abuts the limiting protrusion 133, and at this time the elastic member 31 is still in a compressed state. An arrangement of the supporting post 33 is able to play a limiting role on the return block 32, so that the return block 32 stops at a position opposite to the accommodating hole 132.

In addition, when removing the execution assembly 50, the elastic member 31 restores an elasticity, and the return block 32 is able to apply an ejection force for disengaging from the main shaft 13 to the execution assembly 50, so that the execution assembly 50 is more convenient to remove.

In an embodiment disclosed in FIG. 38 to FIG. 64, the battery pack 16 is mounted to the polishing machine 100a or removed from the polishing machine 100a along a left-right direction of the polishing machine 100a. A direction in which the battery pack 16 is mounted to the coupling portion 113 is a first direction 104, and a direction in which the battery pack 16 is removed from the coupling portion 113 is a second direction 105. As shown in FIG. 38, the battery pack 16 is inserted into the coupling portion 113 from left to right, that is, the first direction 104 is from left to right, and the second direction 105 is from right to left.

In an embodiment disclosed in FIG. 65, a battery pack 16a is mounted to a polishing machine 100b or removed from the polishing machine 100b along an up-down direction of the polishing machine 100b. A first direction 104a is from top to bottom, and a second direction 105a is from bottom to top. In an embodiment disclosed in FIG. 66, an insertion and removal direction of a battery pack 16b forms an angle α with a front-back direction of a polishing machine 100c, and the angle α can be approximately 30 degrees, 45 degrees, 50 degrees, 55 degrees, 60 degrees, 65 degrees, 70 degrees, etc. A first direction 104b is from upper right to lower left, and the second direction 105a is from lower left to upper right.

With reference to FIG. 63, when the working attachment 900 of the polishing machine contacts a workpiece, the working attachment 900 is considered to move on a working plane P. When the working plane P is parallel to a horizontal plane, the polishing machine 100a is placed in a manner shown in FIG. 63. As shown in FIG. 63 to FIG. 66, when a battery pack 16, 16a, 16b is mounted to the polishing machine, a lowermost end of the battery pack 16, 16a, 16b does not protrude beyond a lowermost end of the motor housing 116. The lowermost end of the battery pack 16, 16a, 16b does not protrude beyond a lowermost end of the operation switch 19, and the lowermost end of the operation switch 19 does not protrude beyond the lowermost end of the motor housing 116.

A distance between the lowermost end of the motor housing 116 and the working plane P is defined as a first distance H1. In some embodiments, the first distance H1 can be 40 mm, 45 mm, 50 mm or 55 mm.

The operation switch 19 comprises a midpoint 191 of an operation surface that contacts a finger, the midpoint 191 refers to a geometric midpoint of the operation surface in a front-back direction, and a distance between the midpoint 191 and the working plane P is defined as a second distance H2. In some embodiments, the second distance H2 can be 45 mm, 50 mm, 55 mm or 60 mm.

A length of the grip portion 111 along the front-back direction is a fifth length L5, a frontmost side of the fifth length L5 is near a frontmost side of the operation switch 19, and is also a transition area where the housing 11 transitions to the motor 12; a rear side of the fifth length L5 is an outer edge of the coupling portion 113 that combines with the battery pack 16. A perimeter of the grip portion 111 is greater than or equal to 120 mm, and less than or equal to 160 mm. A distance between a minimum outer diameter of the grip portion 111 and the working plane P is defined as a third distance H3. In some embodiments, the third distance H3 can be 65 mm, 70 mm, 75 mm or 80 mm.

When the battery pack 16 is mounted to the polishing machine 100a and is in a ready-to-start status, a distance between the battery pack 16 and the working plane P is a fourth distance H4, and the fourth distance H4 is greater than or equal to 40 mm. In an embodiment, the fourth distance H4 is greater than or equal to 50 mm. In an embodiment, the fourth distance H4 is greater than or equal to 55 mm. In an embodiment, the fourth distance H4 is greater than or equal to 60 mm. In some embodiments, the fourth distance H4 can be 52 mm, 54 mm, 56 mm, 58 mm, 60 mm, 62 mm, 64 mm or 66 mm.

The first distance H1 is greater than or equal to the second distance H2, the second distance H2 is greater than the third distance H3, the fourth distance H4 is greater than the second distance H2, and the fourth distance H4 is greater than the third distance H3.

A housing portion of the housing 11 of the polishing machine 100a located at a front side of the motor 12 is called the head housing 112, a distance from the working plane P to a top of the head housing 112 is a fifth distance H5, and in some embodiments, the fifth distance H5 can be 115 mm, 120 mm, 125 mm, 130 mm. In the present embodiment, as shown in FIG. 63, the top of the head housing 112 is substantially flush with a top of the battery pack 16.

With reference to FIG. 45, a distance between the first axis 101 and the motor axis 103′ is defined as a second distance L2, a farthest distance from a farthest end of the housing 11 to the coupling portion 113 is defined as a third distance L3, and a ratio of the second distance L2 to the third distance L3 (L2/L3) is greater than or equal to 0.15 and less than or equal to 0.25. In an embodiment, the ratio of the second distance L2 to the third distance L3 (L2/L3) is approximately 0.2.

A maximum length L4 of the polishing machine 100a is defined as a total length of the polishing machine 100a along a front-back direction when equipped with the battery pack 16, and the maximum length L4 is less than or equal to 300 mm. In an embodiment, the maximum length L4 is less than or equal to 280 mm. In an embodiment, the maximum length L4 is less than or equal to 270 mm. In some embodiments, the maximum length L4 can be 270 mm, 275 mm, 290 mm, 295 mm, etc. The battery pack 16 can be a 1P pack or a 2P pack, and no limitation is made here.

In the present embodiment, a maximum outer diameter of the motor 12 can be 30 mm, 35 mm or 40 mm. The motor 12 can be an inner rotor motor or an outer rotor motor. A speed output by the main shaft 13 is less than or equal to 6000 RPM. When including the battery pack 16, an overall weight of the polishing machine 100a is greater than or equal to 0.8 kg. In an embodiment, an overall weight of the polishing machine 100a including the battery pack 16 is greater than or equal to 0.9 kg; in an embodiment, an overall weight of the polishing machine 100a including the battery pack 16 is greater than or equal to 1 kg. In some embodiments, a bare machine weight of the polishing machine 100a not including the battery pack 16 is approximately 0.65 kg, 0.7 kg, 0.75 kg or 0.8 kg.

FIG. 67 and FIG. 68 disclose that a lighting device 210 is arranged at the head housing 112 of a polishing machine 200, FIG. 67 is a perspective view of the polishing machine 200, and FIG. 68 is a top-down schematic view of the lighting device 210. It should be noted that same components and reference numerals in FIG. 38 to FIG. 66 are all applicable to the polishing machine 200 disclosed in FIG. 67 to FIG. 68, and a repeated description is not provided here.

The lighting device 210 is a C-shaped light strip arranged on the head housing 112, and the lighting device 210 is located above the mounting assembly 20. The lighting device 210 can be embedded into the head housing 112, and an outer surface of the lighting device 210 is slightly lower than or substantially flush with an outer surface of the head housing 112, so as not to affect a gripping feel of a hand at the head housing 112. In an embodiment, the lighting device 210 can emit light of yellow and white colors, thereby meeting lighting requirements under different lighting conditions and different working planes. When the lighting device 210 is cross-sectioned along a plane perpendicular to the first axis 101, a cross-sectional shape is substantially as shown in FIG. 68, the cross-section intersects the first axis 101 at an intersection point C, farthest points of the lighting device 210 on left and right sides of the polishing machine 200 are a first point D and a second point E respectively, the intersection point C is respectively connected to two end points of the lighting device 210, to form an expansion angle β of the lighting device 210, and the expansion angle β is greater than or equal to 45 degrees and less than or equal to 250 degrees. In an embodiment, the expansion angle β is greater than or equal to 100 degrees and less than or equal to 220 degrees.

FIG. 69 to FIG. 81 show yet another embodiment of the power tool of the present application. The power tool involved in the present embodiment can be a handheld power tool. The power tool involved in the present embodiment can also be a grinding power tool. The power tool can be an angle grinder, a polishing machine, a cutting machine, a grooving machine, an electric wood router, a saw, etc. The present embodiment is described by using a polishing machine 300 as an example.

The grinding power tool in the present embodiment is a polishing machine 300. The polishing machine 300 comprises a housing 11, a motor 12 and a main shaft 13. The housing 11 forms a grip portion 111 for a user to grip, and the grip portion 111 extends along a front-back direction. The housing 11 forms a head housing 112 at a front end of the grip portion 111 and an upper portion of the main shaft 13. The polishing machine 300 further comprises a motor 12, the motor 12 comprises a motor shaft 121, a stator and a rotor, and the motor shaft 121 is capable of rotating around a motor axis 102. The polishing machine 300 further comprises a main shaft 13, the main shaft 13 is capable of rotating around a first axis 101 relative to the housing 11, and a lower end of the main shaft 13 is arranged to mount a working attachment 900. The motor 12 drives the main shaft 13 to rotate, an output end of the main shaft 13 is connected to an execution assembly 50, and the execution assembly 50 is directly connected to the working attachment 900, so that a rotation of the motor 12 drives a rotation of the working attachment 900. In the present embodiment, the polishing machine 300 may further comprise a transmission assembly 14, the transmission assembly 14 is arranged between the motor 12 and the main shaft 13, and transfers a speed and a torque of the motor 12 to the main shaft 13. In some embodiments, the motor 12 may directly drive the main shaft 13 to rotate.

The housing 11 comprises four parts: a left housing 1110, a right housing 1120, an upper coupling portion 1131 and a lower coupling portion 1132. The left housing 1110 and the right housing 1120 are two half housings arranged along a left-right direction. When the left housing 1110 and the right housing 1120 are combined together, the left housing 1110 and the right housing 1120 jointly form a grip portion 111 for a user to grip, a motor housing 116 that accommodates the motor 12, and a head housing 112 located at a front end of the grip portion 111 and connected to the mounting assembly 20. An edge of the grip portion 111 or a rear side of the grip portion 111 is connected to a coupling portion 113, and the coupling portion 113 is mounted and connected to the battery pack 16. The coupling portion 113 is divided into an upper coupling portion 1131 and a lower coupling portion 1132, and the upper coupling portion 1131 and the lower coupling portion 1132 are assembled together to jointly form an accommodation space for mounting the battery pack 16.

Components of the polishing machine 300 having same characteristics and functions as the polishing machine 100a use same reference numerals, and only structures in the polishing machine 300 that are different from the polishing machine 100a are described in detail below.

FIG. 69 is a left view of the polishing machine 300. The polishing machine 300 comprises a lighting device 220 arranged on the head housing 112, and a light emitted by the lighting device 220 reaches an obliquely lower side of the main shaft 13, thereby illuminating a working area of the polishing machine 300. FIG. 70 to FIG. 72 show a perspective view at the head housing 112 of the polishing machine 300 and an internal schematic view after removing the left housing 1110.

As shown in FIG. 76 to FIG. 78, the lighting device 220 comprises a light-transmitting cover 221 capable of conducting a light. The light-transmitting cover 221 comprises a conical light-transmitting portion and a mounting portion located at an edge of the light-transmitting portion. An end with a larger radius of the conical light-transmitting portion is located above an end with a smaller radius, and the mounting portion is arranged to achieve a mounting of the light-transmitting cover 221 with other components of the polishing machine 300. That is to say, the light-transmitting cover 221 gradually contracts from top to bottom. The lighting device 220 further comprises a light-emitting element 224 capable of emitting a light, and a light emitted by the light-emitting element 224 directly passes through the light-transmitting cover 221, and reaches an obliquely lower side of the main shaft 13. It should be noted that, “directly passes through” here refers to following two situations. In one situation, a light, after leaving the light-emitting element 224, first enters an air medium between the light-transmitting cover 221 and the light-emitting element 224, then passes through the light-transmitting cover 221, then reaches an air outside the polishing machine 300, and finally shoots toward a working plane P on a workpiece that contacts the working attachment 900. In another situation, the light-emitting element 224 contacts the light-transmitting cover 221, a light, after leaving the light-emitting element 224, immediately passes through the light-transmitting cover 221, then reaches an air outside the polishing machine 300, and finally shoots toward a working plane P on a workpiece that contacts the working attachment 900. In the above two situations, a light, after leaving the light-emitting element 224, directly passes through the light-transmitting cover 221 to reach the working plane P without a need for a refraction through other components. Such an arrangement improves a utilization rate of the light, and also reduces component structures in the lighting device 220.

The lighting device 220 further comprises a light-emitting board 223 and a heat dissipation bracket 222. The light-emitting element 224 can be a single independent lamp bead, and a plurality of light-emitting elements 224 are mounted on the light-emitting board 223. The light-emitting board 223 is supported by the heat dissipation bracket 222, and the light-emitting board 223 and the light-emitting elements 224 are arranged between the light-transmitting cover 221 and the heat dissipation bracket 222. The heat dissipation bracket 222 can be made of a metallic aluminum. The light-transmitting cover 221, the light-emitting board 223 and the heat dissipation bracket are all arranged around the first axis 101. In the present embodiment, the light-emitting board 223 is a flexible circuit board. As shown in FIG. 73, a plurality of light-emitting elements 224 protrude from the light-emitting board 223, and form a C-shaped light strip, and can also be called a ring light strip. Similar to the lighting device 210 in the polishing machine 200 shown in FIG. 67 to FIG. 68, an expansion angle β of the C-shaped light strip in the present embodiment is greater than or equal to 45 degrees and less than or equal to 250 degrees. In an embodiment, the expansion angle β is greater than or equal to 60 degrees and less than or equal to 200 degrees. In an embodiment, the expansion angle β is greater than or equal to 90 degrees and less than or equal to 180 degrees. In an embodiment, the expansion angle β is greater than or equal to 120 degrees and less than or equal to 180 degrees. In an embodiment, the expansion angle β is greater than or equal to 150 degrees and less than or equal to 180 degrees.

With reference to FIG. 69 to FIG. 71, the head housing 112 comprises a first portion 1121 and a second portion 1122, and the first portion 1121 is located above the second portion 1122. In an up-down direction, when the housing 11 transitions from the first portion 1121 to the second portion 1122, the housing 11 experiences a contraction portion 1123. That is to say, in a radial direction along the first axis 101, a farthest distance from the first axis 101 to the first portion 1121 is greater than a farthest distance from the first axis 101 to the second portion 1122.

A user, during a work, may place one hand on the head housing 12 to assist a gripping. In a prior art, the lighting device 210 is generally arranged on the head housing 112 as shown in FIG. 67. In this case, there is no significant difference between radii of the first portion 1121 and the second portion 1122, and fingers of the user may inadvertently block the lighting device 210. In addition, for the lighting device 210 in the embodiment shown in FIG. 67, because a light-transmitting cover of the lighting device 210 is substantially flush with a housing at a frontmost end of the head housing 112, a light emitted by a light-emitting element needs to undergo a refraction to be emitted obliquely downward along the main shaft 13, resulting in more components inside the lighting device 210. In the lighting device 220 disclosed in FIG. 69 to FIG. 78, the obliquely arranged light-transmitting cover 221 can enable fingers of a user to clearly feel a contraction at the head housing 112, thereby avoiding placing fingers on the light-transmitting cover 221. In the present embodiment, the contraction portion 1123 comprises the light-transmitting cover 221, and the light-transmitting cover 221 connects the first portion 1121 and the second portion 1122, so that the head housing 112 contracts from a larger radius to a smaller radius.

FIG. 78 is a cross-sectional view of the polishing machine 300 along a mid-plane. The mid-plane can be explained as a mold parting surface designed along a symmetrical center or a main parting direction of the polishing machine. The mid-plane bisects the left housing 1110 and the right housing 1120. The light-transmitting cover 221 comprises a light-transmitting surface 2211 facing an outer side of the polishing machine 300. The light-transmitting surface 2211 is an outer surface with a maximum light transmission amount among outer surfaces of the light-transmitting cover 221. That is to say, a majority of a light passing through the light-transmitting cover 221 passes through the light-transmitting surface 2211. An angle φ1 formed between the light-transmitting surface 2211 and a working plane P is greater than or equal to 10 degrees and less than or equal to 80 degrees. In some embodiments, the angle φ1 formed between the light-transmitting surface 2211 and the working plane P is greater than or equal to 10 degrees and less than or equal to 60 degrees. In some embodiments, the angle φ1 formed between the light-transmitting surface 2211 and the working plane P can be 20 degrees, 25 degrees, 30 degrees, 35 degrees, 40 degrees or 50 degrees.

In addition to the light-transmitting cover 221 being obliquely arranged relative to the working plane P, the light-emitting board 223 in the light-transmitting cover 221 and the light-emitting elements 224 on the light-emitting board 223 are also obliquely arranged relative to the working plane P. The light-emitting element 224 comprises a main light-emitting surface 2241 and a secondary light-emitting surface 2242. The main light-emitting surface 2241 is a light-emitting surface with a maximum area among light-emitting surfaces of the light-emitting element 224, and the secondary light-emitting surface 2242 refers to remaining light-emitting surfaces other than the main light-emitting surface 2241. In the present embodiment, for a same light-emitting element 224, a number of the main light-emitting surfaces 2241 is one, and a number of the secondary light-emitting surfaces 2242 is four. In some embodiments, an angle φ2 formed between the main light-emitting surface 2241 and the working plane P is greater than or equal to 10 degrees and less than or equal to 80 degrees. In some embodiments, the angle φ2 formed between the main light-emitting surface 2241 and the working plane P is greater than or equal to 10 degrees and less than or equal to 70 degrees. In some embodiments, the angle φ2 formed between the main light-emitting surface 2241 and the working plane P is greater than or equal to 10 degrees and less than or equal to 60 degrees. In some embodiments, the angle φ2 formed between the main light-emitting surface 2241 and the working plane P is greater than or equal to 10 degrees and less than or equal to 50 degrees. In some embodiments, the angle φ2 formed between the main light-emitting surface 2241 and the working plane P is greater than or equal to 20 degrees and less than or equal to 50 degrees. In some embodiments, the angle φ2 formed between the main light-emitting surface 2241 and the working plane P can be 30 degrees, 35 degrees, 40 degrees or 45 degrees. With reference to FIG. 73, each light-emitting element 224 is substantially cubic, a main light-emitting surface 2241 of each light-emitting element 224 is approximately a square, and a thickness of the light-emitting element 224 is much smaller than a side length of the main light-emitting surface 2241.

As shown in FIG. 75, similar to the polishing machine 100a, the polishing machine 300 also comprises an inner housing 15a, the inner housing 15a is arranged in the head housing 112 of the housing 11, and the inner housing 15a is arranged to support the motor 12 and the main shaft 13. The inner housing 15a comprises a first positioning hole 151 and a second positioning hole 152, the first positioning hole 151 is formed in a main shaft housing 156 that accommodates the main shaft 13, a support plate 157 is formed extending from a top end of the main shaft housing 156 toward a direction of the grip portion 111, and the second positioning hole 152 is located on the support plate 157. The main shaft 13 extends through the first positioning hole 151 of the inner housing 15a and is connected to the inner housing 15a through a bearing, and the motor shaft 121 extends through the second positioning hole 152 of the inner housing 15a and is connected to the inner housing 15a through a bearing.

As shown in FIG. 72, FIG. 74 and FIG. 75, the inner housing 15a is fixed by the left housing 1110 and the right housing 1120. Taking the left housing 1110 as an example, a first positioning pin 1111 and a second positioning pin 1112 are arranged in the left housing 1110. The inner housing 15a is provided with two first positioning openings 153 and two second positioning openings 155 symmetrically distributed along a mid-plane of the polishing machine 300. The first positioning pin 1111 is inserted into the first positioning opening 153, and the second positioning pin 1112 is inserted into the second positioning opening 155. When the left housing 1110 and the right housing 1120 are combined and assembled through screws, the inner housing 15a is also simultaneously fixed. The support plate 157 is further provided with three motor mounting holes 154 arranged around the second positioning hole 152, so that the motor 12 is fixed to the second positioning hole 152 through screws 158 (see FIG. 70).

The lighting device 220 further comprises a wire 225 (see FIG. 76), the wire 225 is led out from the light-emitting board 223, and is connected to a circuit board 17. It should be noted that, a specific structure and a specific position of the circuit board 17 are not shown in the present embodiment, and a reference can be made to the circuit board 17 in FIG. 39.

The flexible light-emitting board 223 is attached to the heat dissipation bracket 222 and is mounted to an interior of the head housing 112. The heat dissipation bracket 222 is composed of two parts, one part is a support portion 2221 that directly contacts the light-emitting board 223, and another part is an arc-shaped extension portion 2222 extending from the support portion 2221. The extension portion 2222 increases a heat dissipation area of the heat dissipation bracket 222, and facilitates a mounting of an entire lighting device 220 to the inner housing 15a. The support portion 2221 forms an opening 2223 for the wire 225 to pass through. The light-transmitting cover 221 and an end portion of the heat dissipation bracket 222 fix the light-emitting board 223 therein by a snap connection, and a specific snap connection structure is a conventional technical means, and details are not described herein again. The heat dissipation bracket 222 and the light-transmitting cover 221 assembled together jointly form two mounting portions 226, arranged to mount the lighting device 220 to the inner housing 15a.

An installation method of the lighting device 220 is described below. As shown in FIG. 74 and FIG. 75, the lighting device 220 partially surrounds the main shaft housing 156 of the inner housing 15a, a snap connection portion 1561 is arranged on an outer surface of the main shaft housing 156, and the snap connection portion 1561 is snap-connected with the mounting portion 226. A specific structure is a conventional technical means, and details are not described herein again. A mounting opening 1113 is further formed on the left housing 1110, at least a portion of the lighting device 220 can be embedded into the mounting opening 1113, and another mounting opening (not shown in the figure) symmetrical to the mounting opening 1113 on the left housing 1110 is also formed on the right housing 1120. When the left housing 1110 and the right housing 1120 are combined together, the lighting device 220 is fixed by the left housing 1110, the right housing 1120 and the main shaft housing 156.

The light-emitting element 224 can emit a light of at least two colors, a color temperature of the light is greater than or equal to 85, and a color temperature of the light is greater than or equal to 6000k. In some embodiments, a color temperature of the light is greater than or equal to 90. In some embodiments, a color temperature of the light is approximately 92, 94 or 95. The lighting device 220 can emit a yellow light and a white light, thereby meeting lighting requirements under different lighting conditions and different working planes. A lighting switch is further arranged on the polishing machine 300, and the lighting switch can control a lighting, an extinguishing and a color temperature conversion of the lighting device 220.

In the present embodiment, the first axis 101 is substantially parallel to the motor axis 102. In some embodiments, an angle formed between the first axis 101 and the motor axis 102 is greater than or equal to 45 degrees and less than or equal to 135 degrees. That is to say, an arrangement manner of the motor 12 relative to the main shaft 13 does not affect an arrangement of the lighting device 220. In addition, the light-transmitting cover 221, the light-emitting board 223 and the heat dissipation bracket 222 can be sealed by an injection molding, to prevent a dust from entering the lighting device 220.

When a user needs to replace the working attachment 900, the working attachment 900 needs to be removed from an output end of the polishing machine 300. When removing the working attachment 900, the working attachment 900 needs to be removed from a component shown in FIG. 81. On the polishing machine 300 without a locking mechanism 40, because the rotation member 51 and the outer ring gear 54 can rotate relative to each other, a user needs to grip the counterweight 53 with a palm of one hand, grip a plurality of teeth on the outer ring gear 54 with a thumb, grip the working attachment 900 with another hand, and rotate two hands relative to each other. In such an operation, on one hand, fingers exert a force on the teeth, and an operating experience of the user is poor; on the other hand, a hand may cause a contamination of the outer ring gear 54.

A technical solution disclosed in FIG. 79 to FIG. 81 solves a technical problem of an inconvenient removal of the working attachment 900. A locking mechanism 40 is provided in the polishing machine 300, so that the rotation member 51 of the execution assembly 50 and the outer ring gear 54 cannot move relative to each other. A user only needs to grip the rotation member 51 to unscrew the working attachment 900, without a need to touch the outer ring gear 54.

The execution assembly 50 is mounted to a lower end of the main shaft 13, and is connected to the main shaft 13. The execution assembly 50 is directly connected to the working attachment 900. For a replacement of the working attachment 900, a working attachment 900 to be replaced needs to be first removed from the execution assembly 50. In the present embodiment, the execution assembly 50 comprises a rotation member 51 and an output member 52, and the rotation member 51 is detachably connected to the main shaft 13. The rotation member 51 is capable of being driven by the main shaft 13 to rotate around the first axis 101 when connected to the main shaft 13. A connection sleeve 514 (see FIG. 81) arranged to connect the output member 52 is arranged in the rotation member 51, and the connection sleeve 514 is fixed in an accommodation space at a lower portion of the rotation member 51 through at least one bearing. One end of the output member 52 is connected to the rotation member 51, and another end is connected to the working attachment 900. The output member 52 and the rotation member 51 form a rotational connection, the output member 52 is capable of rotating around a second axis 102 relative to the rotation member 51, and the second axis 102 is parallel to and spaced from the first axis 101. The execution assembly 50 is capable of rotating around the second axis 102, and the second axis 102 is substantially parallel to the first axis 101.

The locking mechanism 40 comprises an operation portion 41 and a locking portion 42. The locking portion 42 can lock the execution assembly 50 and the working attachment 900, so that the working attachment 900 cannot rotate relative to the execution assembly 50. The operation portion 41 is for a user to operate, to operate a movement of the locking portion 42. The locking portion 42 can be located at a locking position or a relief position. When the locking portion 42 is located at the relief position, the execution assembly 50 and the working attachment 900 can move relative to each other; when the locking portion 42 is located at the locking position, the execution assembly 50 and the working attachment 900 cannot move relative to each other.

The locking portion 42 comprises a rod-shaped rod body 424, and the rod body 424 is provided with two groups of limiting grooves, that is, a first limiting groove 421 and a second limiting groove 422, and the first limiting groove 421 is above the second limiting groove 422. A limiting portion 423 is arranged at a lower end of the rod body 424, the limiting portion 423 protrudes from an outer surface of the rod body 424, and extends into an opening of the rotation member 51.

The locking mechanism 40 further comprises an elastic element 44. In the present application, the elastic element 44 is a spring. A locking member 43 is arranged on a left side of the elastic element 44, and a covering member 45 is arranged on a right side. That is to say, the elastic element 44 is located between the rod body 424 and the covering member 45. The locking member 43 can engage with shapes of the first limiting groove 421 and the second limiting groove 422, and the covering member 45 can prevent the elastic element 44 from popping out from an interior of the rotation member 51. A user needs to press the operation portion 41 and overcome an elastic force of the elastic element 44 to move the rod body 424 downward.

A locking opening 543 is formed on an upper surface of the outer ring gear 54, and the locking opening 543 allows a lower end portion of the rod body 424 to extend into to form a locking. When the locking portion 42 is located at the locking position, the locking member 43 engages with the first limiting groove 421, and the lower end portion of the rod body 424 extends into the locking opening 543. When the locking portion 42 is located at the relief position, the locking member 43 engages with the second limiting groove 422, and the lower end portion of the rod body 424 leaves the locking opening 543. The operation portion 41 has a first position and a second position. When the operation portion 41 is located at the first position, the locking portion 42 is located at the relief position; when the operation portion 41 is located at the second position, the locking portion 42 is located at the locking position. When the operation portion 41 moves from the first position to the second position, the locking portion 42 moves from the relief position to the locking position. In the present embodiment, the second position is higher than the first position, and both the operation portion 41 and the locking portion 42 achieve a locking of the outer ring gear 54 relative to the rotation member 51 through a movement. A movement direction of the operation portion 41 is substantially parallel to the first axis 101, and a movement direction of the locking portion 42 is also substantially parallel to the first axis 101.

It should be noted that, the operation portion 41 can also achieve a locking through other movement manners such as a rotation or a translation plus a rotation, and the locking portion 42 can also achieve a locking through a movement manner of a rotation or a translation plus a rotation.

An assembly of the execution assembly 50 and the working attachment 900 is described below according to FIG. 80 to FIG. 83.

FIG. 82 discloses a specific structure of an output member 52a in the present embodiment. Same as the output member 52 in FIG. 50 and FIG. 51, the output member 52a also comprises a second shaft portion 523 that can extend into and be mounted to the rotation member 51, a first connection portion 521a that directly connects the working attachment 900, and a second connection portion 522a that engages with a shape of the outer ring gear 54. Only aspects where the output member 52a is different from the output member 52 are described below. A portion of the second connection portion 522a that engages with the outer ring gear 54 is divided into an upper portion 5222 and a lower portion 5223, and the upper portion 5222 is above the lower portion 5223. The upper portion 5222 and the lower portion 5223 do not overlap in an axial direction along the first axis 101. An external thread 5212 arranged to achieve an assembly with the working attachment 900 is arranged on the first connection portion 521a. That is to say, an external thread 5212 is arranged at a lower end of the execution assembly 50.

FIG. 80 and FIG. 83 disclose a structure of the working attachment 900.

As shown in FIG. 80, the working attachment 900 comprises a working portion 62 that directly contacts a workpiece to be polished, and the working portion 62 completes a polishing work of the power tool or the polishing machine 300 through a friction with the workpiece to be polished. Because the working portion 62 is usually a flexible structure such as a sponge layer, the working portion 62 is not easy to be directly mounted to the execution assembly 50. Therefore, the working attachment 900 further comprises a supporting assembly 61, and the supporting assembly 61 supports the working portion 62 to complete an output work. The working attachment 900 has a threaded connection portion 610, the threaded connection portion 610 protrudes above the supporting assembly 61, and the threaded connection portion 610 can be assembled and engaged with the external thread 5212 of the execution assembly 50. The threaded connection portion 610 can be integrally formed with the supporting assembly 61, or the two can be separately formed and then assembled together.

The threaded connection portion 610 is a columnar structure protruding from an upper surface of the supporting assembly 61, a first internal thread 6111 is arranged inside the threaded connection portion 610, and the first internal thread 6111 can mesh with the external thread 5212. When the external thread 5212 engages with the first internal thread 6111 and is tightened, the working attachment 900 is mounted on the execution assembly 50. A first external thread 6112 is further arranged on the threaded connection portion 610, and the first external thread 6112 is arranged outside of the first internal thread 6111. A thread direction of the first internal thread 6111 and a thread direction of the first external thread 6112 are opposite. With such an arrangement, the working attachment 900 can be adapted to first connection portions (521, 521a) having different types of threads. Specifically, when the first connection portion 521 of the execution assembly 50 is an internal thread 5211 (see FIG. 45), the threaded connection portion 610 is connected to the execution assembly 50 through the first external thread 6112; when the first connection portion 521 of the execution assembly 50 is an external thread 5212 (see FIG. 81), the threaded connection portion 610 is connected to the execution assembly 50 through the first internal thread 6111.

As shown in FIG. 83, the supporting assembly 61 comprises a mounting member 611, a support body 612, a reinforcing member 613 and a transition member 614, wherein, both the reinforcing member 613 and the transition member 614 are arranged to strengthen a rigidity of the support body 612. When the support body 612 itself already has a large rigidity, the supporting assembly 61 may only comprise the mounting member 611 and the support body 612. The threaded connection portion 610 is formed on the mounting member 611, and the threaded connection portion 610 is a part of the mounting member 611. The mounting member 611 further comprises a mounting ring 6113 embedded inside the support body 612, the transition member 614 is arranged outside the mounting ring 6113, and the transition member 614 directly contacts the support body 612. The support body 612 surrounds at least a portion of a structure of the mounting member 611. In the present embodiment, the support body 612 surrounds the mounting ring 6113.

The support body 612 can be a rubber material made through a foaming process. To ensure a strength of the threaded connection portion 610, the mounting member 611 can be an iron part. Because the transition member 614 is arranged between the mounting ring 6113 of the mounting member 611 and the support body 612, the transition member 614 is usually composed of a material with a hardness between the mounting member 611 and the support body 612. The transition member 614 is arranged around an outer periphery of the mounting ring 6113, and forms an interference fit with the mounting ring 6113. In the present embodiment, when the mounting member 611 is an iron part, the transition member 614 can be an aluminum part. A mounting ring 613 is further arranged inside the support body 612, the mounting ring 613 can be embedded inside the support body 612, and is formed together with the support body 612. The mounting ring 613 can be a material with a strength greater than the support body 612.

It should be noted that, the above technical solution about the working attachment 900 is not only limited to an application on a polishing machine, but also can be applied to a power tool that can output a rotational movement.

A polishing machine has three forms: a forced eccentric rotation, a free eccentric rotation and a non-eccentric rotation. A forced eccentric rotation (a fixed eccentric rotation) and a free eccentric rotation (a random eccentric rotation) of a polishing machine are two different polishing disc movement modes, and main differences lie in a trajectory control method, a polishing effect and an applicable scenario. The forced eccentric rotation is that a polishing disc rotates around a fixed eccentric point, and a movement trajectory is a regular circle or an ellipse. The free eccentric rotation is that a polishing disc simultaneously performs a self-rotation and a revolution, but an eccentric point changes randomly. A solution disclosed in FIG. 38 to FIG. 62 in the present application is a forced eccentric rotation solution.

A polishing machine with a forced eccentric rotation is defined as a first type polishing machine, and a polishing machine with a free eccentric rotation or a non-eccentric rotation is defined as a second type polishing machine. In a prior art, a thread structure of the first connection portion 521 of the execution assembly 50 of the first type polishing machine is different from a thread structure of the first connection portion 521 of the execution assembly 50 of the second type polishing machine. In addition, as shown in FIG. 84, a threaded connection portion 610 of a conventional working attachment 65 only comprises a first external thread 6112, and does not comprise an internal thread. In one case, a rotation direction of the main shaft 13 of the first type polishing machine is same as a rotation direction of the main shaft 13 of the second type polishing machine, and both the first type polishing machine and the second type polishing machine are installed with the working attachment 65. The first type polishing machine, due to an additional layer of gears, that is, the outer ring gear 54 and the inner ring gear 115, a rotation direction for tightening the execution assembly 50 and the working attachment 65 needs to be exactly opposite to that of the second type polishing machine, otherwise the working attachment 900 will become looser and looser during a work.

To solve the above technical problems, in the technical solution of the present application, the first connection portion 521 of the execution assembly 50 of the first type polishing machine has an external thread 5212, and the first connection portion 521 of the execution assembly 50 of the second type polishing machine has an internal thread 5211. Because the first internal thread 6111 and the first external thread 6112 are simultaneously arranged on the working attachment 900 and rotation directions are opposite, the working attachment 900 can be simultaneously applicable to the first type polishing machine and the second type polishing machine.

It should be noted that, a thread structure of the first connection portion 521 of the first type polishing machine and a thread structure of the first connection portion 521 of the second type polishing machine are often opposite. For example, the first connection portion 521 of the first type polishing machine is an external thread, and the first connection portion 521 of the second type polishing machine is an internal thread 5211. Of course, a case opposite to the above example is also possible. The working attachment 900 involved in the present application can be applied in the first type polishing machine, and can also be applied in the second type polishing machine. The working attachment 900 comprises a working portion 62 that directly contacts a workpiece to complete an output work and a supporting assembly 61 that supports the working portion 62. The supporting assembly can be rotatably mounted in the first type polishing machine, and can also be rotatably mounted in the second type polishing machine.

Another way to solve the above technical problems is to design the main shaft 13 of the first type polishing machine and the second type polishing machine to have different rotation directions, but the first connecting part 521 of them could be of the same form, that is, both are internal threads 5211 or both are external threads 5211. In this solution, the polishing machine or the power tool has an identification component, and the identification component can identify a working mode of the execution assembly 50. When the identification component identifies that the execution assembly 50 works in a forced eccentric rotation mode, the main shaft 13 of the polishing machine rotates in a first rotation direction; when the identification component identifies that the execution assembly 50 works in a natural eccentric rotation or a non-eccentric rotation mode, the main shaft 13 of the polishing machine rotates in a second rotation direction; the first rotation direction is opposite to the second rotation direction.

FIGS. 85 to 98 illustrates another embodiment of polishing machine.

As shown in FIG. 85 to FIG. 87, a polishing machine includes a main engine 10a and a first execution assembly 50′. The main engine 10a includes a housing 11, a motor 12 and a main shaft 13. The first execution assembly 50′ is configured for connecting to a first accessory 50′a, so that the main engine 10a outputs the power to the first execution assembly 50′, and the first execution assembly 50′ drives the first accessory 50a to move so as to realize a first function such as sanding, polishing and waxing. The housing 11 includes a grip portion 111 for a user gripping. The motor 12 is disposed in the housing 11. The main shaft 13 is rotatable about a first axis 101 relative to the housing 11, and the main shaft 13 outputs the power when the main shaft 13 is rotating. The main engine 10a may be detachably connected to the first execution assembly 50', thereby facilitating the user to replace different execution assembly according to the needs.

The polishing machine 100 further includes a second execution assembly 60 for connecting to a second accessory 60a. When the first execution assembly 50′ is disassembled, the user may connect the second execution assembly 60 to the main engine 10a, so that the main engine 10a outputs the power to the second execution assembly 60, and the second execution assembly 60 drives the second accessory 60a to move to realize the second function different from the first function. It can be understood that, the first function may be one or more of the following: sanding, polishing and waxing, and the second function may also be one or more of the following: sanding, polishing and waxing. Both the first function and the second function may be sanding, polishing or waxing. In one example, both the first function and the second function are sanding; the difference is that, the first function may realize sanding with a first precision, and the second function may realize sanding with a second precision.

The polishing machine 100 further includes a third execution assembly 70 for connecting to a third accessory 70a. When the first execution assembly 50′ or the second execution assembly 60 is disassembled, the user may connect the third execution assembly 70 to the main engine 10a, so that the main engine 10a outputs the power to the third execution assembly 70, and the third execution assembly 70 drives the third accessory 70a to move to realize a third function.

When the user needs to perform three processes, namely sanding, polishing and waxing, on the automobiles and the workpieces, the user only needs one polishing machine 100 installed with different execution assemblies to complete the three processes, which facilities the user's operation, saves the cost and improves the work efficiency.

In the present example, the main engine 10a further includes an installation assembly 20 for detachably installing the above-mentioned first execution assembly 50′, the second execution assembly 60 or the third execution assembly 70 to the main shaft 13. As shown in FIG. 87 and FIG. 88, the installation assembly 20 includes a limiting member 21 and an operation member 22. The limiting member 21 is configured for locking or releasing the first execution assembly 50′, the second execution assembly 60 or the third execution assembly 70. The operation member 22 is configured for the user to operate so that the limiting member 21 releases the first execution assembly 50′, the second execution assembly 60 and the third execution assembly 70.

The first execution assembly 50′ includes a first rotation member 51′ and a first output member 52′. The first rotation member 51′ is configured for connecting to the main shaft 13. The first rotation member 51′ may be driven by the main shaft 13 to rotate about the first axis 101 when the first rotation member 51′ is connected to the main shaft 13, and the first rotation member 51′ is a rotation shaft. The first output member 52′ includes a first driving portion 521 for connecting to the first accessory 50a, and the first driving portion 521 may drive the first accessory 50a to rotate about a second axis 1020, where the second axis 1020 coincides with the first axis 1020. The first driving portion 521 is a hole or a post centered on the second axis 1020. In the present example, the first rotation member 51′ and the first output member 52′ are integrally formed. In this way, when the first rotation member 51′ is driven by the main shaft 13 to rotate about the first axis 101, the first output member 52′ drives the first accessory 50a to rotate about the first axis 101. The first accessory 50a is centered on the first axis 101, and the first execution assembly 50′ drives the first accessory 50a to rotate without eccentricity.

The second execution assembly 60 includes a second rotation member 61 and a second output member 62. The second rotation member 61 is configured for connecting to the main shaft 13. The second rotation member 61 may be driven by the main shaft 13 to rotate about the first axis 101 when the second rotation member 61 is connected to the main shaft 13, and the second rotation member 61 is a rotation shaft. The second output member 62 includes a second driving portion 621 for connecting to the second accessory 60a, and the second driving portion 621 may drive the second accessory 60a to rotate. The second output member 62 is rotatably connected to the second rotation member 61, and the second output member 62 is rotatable about a third axis 1030 relative to the second rotation member 61. A distance L1 between the third axis 1030 and the first axis 101 is greater than or equal to 1 mm, and less than or equal to 12 mm. The second driving portion 621 is a hole or a post centered on the third axis 1030. In the present example, since the second output member 62 is connected to the second rotation member 61, the second output member 62 simultaneously drives the second accessory 60a to revolve around the first axis 101 when the second rotation member 61 is rotated about the first axis 101. When the polishing machine 100 is turned on to perform the work on the workpiece, the second output member 62 drives the second accessory 60a to revolve around the first axis 101 under the driving of the second rotation member 61; at the same time, since the second accessory 60a is in contact with the workpiece, the workpiece generates a friction force on the second accessory 60a, and the friction force drives a whole formed by the second accessory 60a and the second output member 62 to rotate about the third axis 1030 relative to the second rotation member 61. That is to say, when the main engine 10a is installed with the second execution assembly, the second accessory 60a rotates about the third axis 1030 while revolving around the first axis 101. In the present example, the second rotation member 61 is further connected with a second counterweight 63, so as to improve the balance of the polishing machine 100 when the second execution assembly 60 is installed.

The third execution assembly 70 includes a third rotation member 71 and a third output member 72 which are configured for connecting to the main shaft 13. The third rotation member 71 is configured for connecting to the main shaft 13. The third rotation member 71 may be driven by the main shaft 13 to rotate about the first axis 101 when the third rotation member 71 is connected to the main shaft 13, and the third rotation member 71 is a rotation shaft. The third output member 72 includes a third driving portion 721 for connecting to the third accessory 70a, and the third driving portion 721 may drive the third accessory 70a to rotate. The third output member 72 is rotatably connected to the third rotation member 71, and the third output member 72 is rotatable about a fourth axis 1040 relative to the third rotation member 71. A distance L2 between the fourth axis 1040 and the first axis 101 is greater than or equal to 1 mm, and less than or equal to 3 mm. The third portion 721 is a hole or a post centered on the fourth axis 1040. In the present example, since the third output member 72 is connected to the third rotation member 71, the third output member 72 simultaneously drives the third accessory 70a to revolve around the first axis 101 when the third rotation member 71 is rotated about the first axis 101. When the polishing machine 100 is turned on to perform the work on the workpiece, the third output member 72 drives the third accessory 70a to revolve around the first axis 101 under the driving of the third rotation member 71; at the same time, since the third accessory 70a is in contact with the workpiece, the workpiece generates a friction force on the third accessory 70a, and the friction force drives a whole formed by the third accessory 70a and the third output member 72 to rotate about the fourth axis 1040 relative to the third rotation member 71. That is to say, when the main engine 10a is installed with the third execution assembly, the third accessory 70a rotates about the fourth axis 1040 while revolving around the first axis 101. In the present example, the third rotation member 71 is further connected with a third counterweight 73, so as to improve the balance of the polishing machine 100 when the third execution assembly 70 is installed.

As shown in FIG. 87 to FIG. 91, the limiting member 21 is movable between a first position in which the first rotation member 51′ is prevented from moving relative to the main shaft 13 and a second position in which the first rotation member 51′ is allowed to move relative to the main shaft 13. The operation member 22 is operatable by the user. When the operation member 22 is operated by the user to slide upward along the first axis 101 relative to the housing 11, the operation member 22 may drive the limiting member 21 to disengage from the first position, so that the first rotation member 51′ may be disassembled from the main shaft 13 by the user. Similarly, when the main engine 10a is installed with the second execution assembly 60, the second rotation member 61 is prevented from moving relative to the main shaft 13 when the limiting member 21 is located in the first position, and the second rotation member 61 is allowed to move relative to the main shaft 13 when the limiting member 21 is located in the second position. When the main engine 10a is installed with the third execution assembly 70, the third rotation member 71 is prevented from moving relative to the main shaft 13 when the limiting member 21 is located in the first position, and the third rotation member 71 is allowed to move relative to the main shaft 13 when the limiting member 21 is located in the second position. In the present example, the first rotation member 51', the second rotation member 61 and the third rotation member 71 each may be formed as a cooperating structure with substantially the same structure, and the cooperating structure is cooperated with the limiting member 21.

As shown in FIG. 92, taking the first execution assembly 50′ as an example, the cooperating structure formed on the first rotation member 51′ is a first groove 511. The limiting member 21 is a sphere, part of which can be inserted into the first groove 511. The main shaft 13 is formed with a driving hole 131 centered on the first axis 101. The driving hole 131 is configured for the first rotation member 51′ inserting into, and a hole wall of the driving hole 131 is formed with an accommodating hole 132 for accommodating the sphere. The accommodating hole 132 penetrates through the driving hole 131 along a first straight line 1050, where the first straight line 1050 is perpendicular to the first axis 101. The first straight line 1050 may be a radial direction of the first axis 101. The sphere may move to the first position and the second position in the accommodating hole 132 along the first straight line 1050. As shown in FIG. 88, FIG. 85 and FIG. 92, when the limiting member 21 is located in the first position, part of the limiting hole 21 extends into the driving hole 131 and is inserted into the first groove 511, so that the limiting member 21 limits the first rotation member 51′ to slide along the first axis 101, thereby preventing the first rotation member 51′ from disengaging from the main shaft 13 along the first axis 101. As shown in FIG. 90 to FIG. 92, when the limiting member 21is located in the second position, the limiting member 21 is located outside the driving hole 131, and disengaged from the first groove 51, so that the limiting member 21 no longer limits the first rotation member 51′ to slide along the first axis 101, thereby allowing the first rotation member 51′ to disengage from the main shaft 13 along the first axis 101. Similarly, when the limiting member 21 is located in the first position, the limiting member 21 is inserted into the first groove 51, and further limits the first rotation member 51′ to rotate relative to the main shaft 13, so that the main shaft 13 may output the power to the first rotation member 51′ through the limiting member 21 so as to drive the first rotation member 51′ to rotate about the first axis 101.

The polishing machine 100 further includes a transmission assembly 14 and an inner housing 15. The transmission assembly 14 is configured to transmit the power between the motor 12 and the main shaft 13. The inner housing 15 is disposed in the housing 11, and configured for accommodating the transmission assembly 14.

The housing 11 includes a head housing 112 located at a front end of the grip portion 111 and a coupling portion 113 located at a rear end of the grip portion 113. The head housing 112 is configured for accommodating the main shaft 13. The coupling portion 113 is configured for installing a battery pack 16. The battery pack 16 is connected to the housing 11 to supply power to the motor 12. The motor 12 is disposed in the grip portion 111. The motor 12 includes a motor shaft 121 rotatable about a rotation axis 106, the motor shaft 121 is connected to the transmission assembly 14, and the transmission assembly 14 is connected to the main shaft 13, so that the transmission assembly 14 may transmit the power outputted by the motor shaft 121 to the main shaft 13. The rotation axis 106 is perpendicular to the first axis 101. Part of the inner housing 15 is disposed in the head housing 112, and the inner housing 15 accommodates the transmission assembly 15 and further accommodates part of main shaft 13. One part of the main shaft 13 is disposed in the inner housing 15, and other part of the main shaft 13 extends out of the inner housing 15. The limiting member 21 is located in the housing 11, and also located outside the inner housing 15. The operation member 22 is located outside the housing 11. One part of the operation member 22 extends into the housing 11, and does not extend into the inner housing 15, so that both the operation member 22 and the limiting member 21 are located outside the inner housing 15, so that the inner housing 15 can effectively seal the transmission assembly 14 located in the inner housing 15 from dust and water.

The installation assembly 20 further includes a first biasing element 23, a driving member 24 and a second biasing element 25. The first biasing element 23 biases the operation member 22 to generate a biasing force for driving the operation member 22 to reset. The first biasing element 23 is a first spring, part of which is sleeved outside the head housing 112, and the first spring is located between the head housing 112 and the operation member 22. One end of the first spring biases the head housing 112, another end of the first spring biases the operation member 22. The operation member 22 surrounds the first axis 101 and is a sleeve, and the operation member 22 is sleeved outside the head housing 112, so that the operation member 22 may slide along the first axis 101 relative to the head housing 112. A guiding member 114 is fixed at a lower end of the head 112. The guiding member 114 is made of metal, and the guiding member 114 guides the operation member 22 to slide along the first axis 101, so that the operation member 22 slides more smoothly. The head housing 112 is made of plastic, and the guiding member 114 is a metal member, thereby avoiding a situation that the operation member 22 slides non-smoothly and the head housing 112 is deformed or damaged caused by directly guiding the operation member 22 by the head housing 112. Both the operation member 22 and the guiding member 114 surround the first axis 101, the guiding member 114 protrudes downward out of the head housing 112. One part of the first spring is sleeved onto the head housing 112, and the other part of the first spring is sleeved outside the guiding member 114. Similarly, one part of the operation member 22 is sleeved onto the head housing 112, and the other part of the operation member 22 is sleeved outside the guiding member 114. The operation member 22 further protrudes downward out of the guiding member 114, so that both the guiding member 114 and the operation member 22 may play a role of protecting the user. The limiting member 21 is disposed outside the inner housing 15, and the guiding member 114 is fixedly connected to the head housing 112. The guiding member 114 further includes a covering portion 114a, and the covering portion 114a covers part of an opening 112a of the head housing 112 open downward, so that the guiding member 114 may effectively protect the limiting member 21 which is located outside the inner housing 15 and inside the housing 11.

The driving member 24 is configured for contacting with the limiting member 21 to drive the limiting member 21 to move to the first position, and the second biasing element 25 generates a biasing force for driving the limiting member 21 to move toward the first position. As shown in FIG. 91 and FIG. 93, in one example, the driving member 24 is a sleeve sleeved onto the main shaft 13, and a driving surface 241 is formed on the driving member 24. The second biasing element 25 is a second spring sleeved onto the main shaft 13, and the second spring biases the sleeve to drive the sleeve to move toward a position in where the driving surface 241 is in contact with the limiting member 21.

The operation member 22 is further formed with a contact portion 221 which is in contact with the sleeve, and the contact portion 221 extends into the housing 11. When the operation member 22 slides upward, the contact portion 221 pushes the driving member 24 upward to compress the second biasing element 25, at this moment, the driving surface 241 is no longer in contact with the limiting member 21. The driving member 24 is further formed with a second surface 242. When the driving member 24 moves upward until the second surface 242 is aligned with the limiting member 21, the limiting member 21 is no longer squeezed by the driving surface 241, at this moment, the driving member 24 allows the limiting member 21 to disengage from the contact of the first rotation member 51′, so that the user may pull out the first execution assembly 50′.

As shown in FIG. 92, the first rotation member 51′ is further formed with a first ring-shaped groove 512. The first ring-shaped groove 512 surrounds the first axis 101, and the first groove 511 is disposed in the first ring-shaped groove 512. The first groove 511 is recessed toward the first axis 101 relative to the first ring-shaped groove 512, and a plurality of first grooves 511 are provided. It can be understood that one first groove 511 may also be provided. In this way, when the first rotation member 51′ is inserted into the driving hole 131, the first groove 511 may not be aligned with the limiting member 21, and the limiting member 21 may be firstly inserted into first ring-shaped groove 512; at this moment, the limiting member 21 is in contact with the first ring-shaped groove 512 and the third surface 243 formed by the driving member 24, respectively, the first rotation member 51′ will not disengaged from the main shaft 13 along the first axis 101, but is rotatable by a certain angle relative to the main shaft 13; and then, when the user rotates the first rotation member 51′ or the motor is turned on, the limiting member 21 moves into the first groove 51′, so that the first rotation member 51′ is non-rotatable relative to the main shaft 13. Where, the third surface 243 is disposed between the first surface and the second surface 142, a distance between the third surface 243 and the first axis 101 is greater than a distance between the first surface and the first axis 101, and a distance between the third surface 243 and the axis 101 is less than a distance between the second surface 242 and the first axis 101.

Similarly, the second rotation member 61 is formed with a second groove 611 having substantially the same structure as the first groove 511, and the third rotation member 71 is formed with a third groove 711 having substantially the same structure as the first groove 511.

The housing 11 has a straight cylindrical shape, which reduces the occupied space and is convenient for use and transportation. As shown in FIG. 87, FIG. 94 and FIG. 96, the motor 12 is an outer rotor motor, and the motor 12 includes an outer rotor 123. A circuit board 17 is disposed in the housing 11. The motor 12 includes an output line 122 electrically connected to the circuit board 17, and the output line 122 is located between the motor 12 and the transmission assembly 14. The outer rotor motor has a smaller volume, occupies less space, provides greater torque, and reduces the whole volume of the polishing machine 100. The arrangement of the position of the output line 122 fully utilizes the space between the motor 12 and the transmission assembly 14, reduces the volume of the housing 11 of the polishing machine 100, and facilitates use and transportation. In the present example, the motor 12 is a brushless sensorless motor. The brushless sensorless motor is not provided with a Hall sensor, and is configured to detect the change of the back electromotive force of the motor 12 through the electronic controller so as to determine the position of the outer rotor 123 of the motor 12 to realize the direction change. Therefore, the brushless sensorless motor is simpler in structure, less in volume and weight, and more compact and portable in the whole structure relative to other motors.

In one example, the housing 11 is configured to be separated from the outer rotor 123 of the motor 12, preventing the housing 11 from interfering with the outer rotor 123 of the motor 12.

A centrifugal fan 124 is disposed at one end of the motor 12, and an axial fan 125 is disposed at another end of the motor 12. The centrifugal fan 124 is located at one of the motor 12 facing toward the transmission assembly 14. The axial fan 125 is configured to guide airflow to flow into an exterior of the housing 11 from an interior of the housing 11. The airflow flows into the interior of the housing 11 from the exterior of the housing 11, and then flows through the motor 12, and finally flows out of the housing 11, so that the heat in the housing 11 may be taken away and the motor 12 is subject to better heat dissipation.

As shown in FIG. 96, the motor 12 further includes a stator core 126, a stator coil 127, a stator supporter 128, and the outer rotor 123. The stator coil 127 is wound onto the stator core 126, and the stator supporter 128 supports the stator core 126. The outer rotor 123 is connected to the motor shaft 121. The axial fan 125 is fixedly connected to the motor shaft 121. The centrifugal fan 124 is fixedly connected to the outer rotor 123. An air guiding cover 18 is disposed outside the motor 12. The air guiding cover 18 includes a surrounding portion 181 and an air guiding portion 182. The surrounding portion 181 surrounds the outer rotor 123. The surrounding portion 181 is spaced from an outer wall of the outer rotor 123 by a certain distance. In other words, the surrounding portion 181 is not in contact with the outer rotor 123, and the air guiding cover 18 is fixed to the housing 11, which prevents the air guiding cover 18 from interfering with the rotation of the outer rotor 123. The surrounding portion 181 may be spaced from the housing 11 by a certain distance, so that the output line 122 may extend along a gap between the surrounding portion 181 and the housing 11, and the output line 122 is protected by the surrounding portion 181 and is not in contact with the outer rotor 123. The air guiding portion 182 is configured to guide the airflow to flow toward a lower side of the motor 12, thereby preventing the heat accumulation in the housing 11 and improving the heat dissipation effect.

The stator supporter 128 is further fixedly connected to the inner housing 15, further improving the sealing effect.

An air outlet 11a is disposed on a position of the housing 11 corresponding to the centrifugal fan 124, and an air inlet 11b is disposed on a position of the housing 11 adjacent to the coupling portion 113. A heat dissipation passage is formed between the air inlet 11b and the air outlet 11a, so as to dissipate heat from the motor 12 and improve cooling effect.

The circuit board 17 is disposed in the grip portion 111, and located between the motor 12 and the coupling portion 113. The circuit board 17 is located on a rear side of the circuit board 17, so that the heat dissipation airflow may simultaneously dissipate heat from the circuit board 17 and the motor 12.

As shown in FIG. 86 and FIG. 87, the polishing machine 100 further includes an operation switch 19 for controlling the on-off of the motor 12. The operation switch 19 is movably connected to the housing 11, and the operation switch 19 may move relative to the housing 11 at least to a first operation position and a second operation position. When the operation switch 19 is in the first operation position, the motor 12 is rotated at a first rotation speed; when the operation switch 19 is in the second operation position, the motor 12 is rotated at a second rotation speed; where the first rotation speed and the second rotation speed each are greater than zero. In other words, the operation switch 19 may not only turn on and turn off the motor 12, but also adjust rotation speed of the motor 12. In one example, the operation switch 19 may perform stepless rotation speed adjustment on the motor 12, and the operation switch 19 is a stroke switch, which is movable relative to the housing 11 and has a plurality of positions corresponding to a plurality of rotation speeds of the motor 12. In the present example, the operation switch 19 is disposed on the top of the grip portion 111 to facilitate the operation.

The housing 111 extends along a second straight line 107 parallel to the rotation axis 106. The operation switch 19 is slidably connected with the housing 11 substantially along the second straight line 107, or the operation switch 19 is rotatable relative to the housing 11 about an axis parallel to the rotation axis 106. When the user grips the grip portion 111, the four fingers of the human hand are bent, the thumb of the human hand extends substantially along the second straight line 107, and the user may use the thumb to operate the operation switch 19 along the second straight line 107.

The operation switch 19 is a slide switch, such as a push button, substantially extending along the second straight line 107, and the operation switch 19 is slidably connected with the housing 11 substantially along the second straight line 107.

As shown in FIG. 97 and FIG. 98, the operation switch 19 is substantially divided into a first operation portion 191 and a second operation portion 192 along a front-rear direction. The first operation portion 191 and the second operation portion 192 are the same in the length along the first-rear direction. In other words, if the operation switch 19 is regarded as a lever, a fulcrum of the lever is located between the first operation portion 191 and the second operation portion 192, where the first operation portion 191 is located on a front side, and the second operation portion 192 is located on a rear side. The housing 11 is formed with a stop portion 11c. When the user only applies a force along the second straight line 107 to the first operation portion 192, the operation switch 19 may only slide relative to the housing 11 to the stop portion 11c; at this moment, the second operation portion 192 needs to be further depressed to bypass the stop portion 11c. When the user applies an oblique downward force to the second operation portion 192, the first operation portion 191 is lifted slightly upward, the operation portion 19 may directly bypass the stop portion 11c to slide forward relative to the housing 11 along the first straight line 1050.

The operation switch 19 is further provided with a fixing portion 193 for fixing the operation switch 19 to a preset position of the housing 11, and the housing 11 is provided with a cooperation portion 11d for cooperating with the fixing portion 193. In one example, the fixing portion 193 is disposed at the bottom of the operation switch 19, and extends along a direction perpendicular to the second straight line 107. In one example, the cooperation portion 11d is a passage allowing at least part of the fixing portion 193 to pass through.

When the operation switch 19 moves relative to the housing 11 to a preset position, the motor 12 has a maximum rotation speed which is greater than the rotation speed of the motor 12 when the operation switch 19 is at any position other than the preset position. When the rotation speed of the motor 12 needs to be maintained at the maximum rotation speed, the user operates the second operation portion 192 to push the operation switch 19 to the preset position and then depress the first operation portion 191, such that the fixing portion 193 of the operation switch 19 is inserted into the cooperation portion 11d; and then the user releases the operation switch 19 to keep the operation switch 19 at the preset position, so that the motor 12 may run at the maximum rotation speed all the time.

The polishing machine 100 further includes at least one speed governing member 194, and the motor 12 has at least two different gear rotation speeds. The speed governing member 194 is configured for adjusting the maximum rotation speed to a preset gear rotation speed, and the maximum rotation speed is equal to the preset gear rotation speed. In other words, the speed governing member 194 is configured for quickly adjusting the maximum rotation speed of the motor 12. In the present example, two speed governing members 194, namely increasing and decreasing, are provided, and four gear rotation speeds are provided. When the user operates the speed governing members 194, the rotation speed of the motor 12 may be quickly switched between the four gear rotation speeds so as to switch the preset gear rotation speed to one of the four gear rotation speeds. At the same time, since the maximum rotation speed of the motor 12 is equal to the preset gear rotation speed, the rotation speed of the motor 12 may only be switched between zero and the preset gear rotation speed when the user adjusts the stroke of the operation switch 19.

In one example, the speed governing member 194 is a button-type member, and the user may depress the speed governing member 194 to adjust the gear rotation speed of the motor 12. In the present example, the housing 11 is provided with two speed governing members 194, namely a speed increasing button and a decreasing button. The increasing button is marked with a plus sign and the decreasing button is marked with a minus sign, which is convenient for the user to identify. A gear light is disposed adjacent to the speed governing member 194, so that the gear rotation speed of the motor 12 is visualized. In one example, a same number of gear lights and gear rotation speeds is provided. In the present example, the motor 12 is provided with four different gear rotation speeds, which are a first-level gear rotation speed to a fourth-level gear rotation speed, respectively; therefore, four gear lights are provided. When the gear rotation speed is the first-level gear rotation speed, one gear light is turned on; when the gear rotation speed is the second-level gear rotation speed, two gear lights are turned on, and so on.

In the present example, a process of moving the operation switch 19 to the stop portion 11c from the turn-on position is defined as a low-speed stage. In other words, during the process of moving the operation switch 19 to the stop portion 11c from the turn-on position, the motor 12 is rotated at a rotation speed less than or equal to the preset rotation speed all the time. When the motor 12 needs to rotate at a low speed in a short time, the user may only operate the first operation portion 191 to stop the operation switch 19 at the stop portion 11c, and does not need to operate the second operation portion 192, thereby facilitating the user's multi-scenario operation.

A reciprocal of a ratio of a change value of the moving stroke of the operation switch 19 to a change value of the corresponding rotation speed of the motor 12 is defined as a speed governing rate. The operation switch 19 is further provided with a high speed stage in which the motor 12 is rotated at a rotation speed greater than or equal to the preset rotation speed, and a speed governing rate in the high speed stage is greater than a speed governing rate in the low speed stage. In the present example, a process where the operation switch 19 bypasses the gear portion and moves to the preset position is a high speed stage. In the high speed stage and the low speed stage, the rotation speed of the motor 12 is linearly changed with the stroke of the operation switch 19. In other words, the speed governing rates in the low and high speed stage each are fixed values, and the speed governing rate in the high speed stage is greater than the speed governing rate in the low speed stage. The design of the speed governing rate is more suitable for the use scenario of the polishing machine 100, enables that the rotation speed is quickly increased to the maximum rotation speed to perform polishing after the polishing liquid is fully spread, and has higher practicality.

The basic principles, main features, and advantages of this application are shown and described above. It is to be understood by those skilled in the art that the aforementioned examples do not limit the present application in any form, and all technical solutions obtained through equivalent substitutions or equivalent transformations fall within the scope of the present application.