ASSEMBLED CHAIR

Description

CROSS-REFERENCE TO RELATED APPLICATIONS

The present application is based upon and claims priority to Chinese patent application No. 202411619186.9, filed on Nov. 13, 2024, the entire content of which is incorporated herein by reference.

TECHNICAL FIELD

The present technical solution relates to the technical field of chairs, in particular to an assembled chair.

BACKGROUND

Chairs are indispensable items in life and are widely present in our daily environment.

Most chairs in the market currently use screws to connect various parts, or directly fix the connections. This method makes the chair assembly and disassembly process complicated, and also affects the overall appearance of the chair. Particularly when the screws are rusted, the aesthetics of the chair is reduced. In addition, some of the existing chairs are also injection-molded into one piece, which makes it impossible to disassemble during transportation, thereby occupying a large space and increasing the transportation cost. Meanwhile, the one-piece injection-molded chair is easily damaged during transportation, which increases transportation loss.

For example, Chinese patent CN201320824755.4 discloses a chair, in which various components are fixed together by screws, which makes disassembly and assembly complicated and affects the overall appearance.

Another example is an injection-molded and assembled chair disclosed in Chinese patent CN202120906624.5, which also uses fasteners such as screws or bolts to fix the various components together. It also has the problems of complicated disassembly and assembly, and the exposed fasteners affect the overall appearance.

SUMMARY

The present technical solution is to provide an assembled chair, in which a slot III and a slot IV of the seat panel are snap-fitted with the opening of the side panel, and a slot V and a plug-in portion I of the backrest are snap-fitted with a slot I and a slot II of the side plate, thereby improving the problem of inconvenient assembly caused by connecting with fasteners such as screws.

The purpose of the present technical solution is so achieved that:

An assembled chair, comprises: two side panels, a seat panel, a backrest, a front crossbeam I, a front crossbeam II and a rear crossbeam;

The upper part of the two side panels is provided with an opening, which is wide at the top and narrow at the bottom, the bottom for the rear side wall of the opening is recessed backward to form a slot VI, the rear side for the upper end face of the side panel is recessed downwards to form a slot I, a slot VIII is provided in the middle of the front side of the side panel, a slot II is provided on the rear side of the side panel, a slot XI is provided on the rear side wall in the lower half of the side panel, and a slot XIII is provided on the front side wall in the lower half of the side panel;

Both sides of the rear end face for the seat panel are recessed forwards to form a slot IV, the width of the slot IV matches the thickness of the side panel, both left and right sides of the front end face of the seat panel are recessed backward to form a slot III that matches the thickness of the side panel, and the front end face of the seat panel between the two slots III extends forwards to form a convex portion;

The left and right side edges in the lower half of the backrest are both recessed inwards to form avoidance grooves, the upper side wall of the avoidance groove is recessed upwards to form a slot V, and the lower side wall of the avoidance groove is protruded to form a plug-in portion I;

The front crossbeam I is protruded upwards in the middle to form a support portion, and the lower sides at the left and right ends of the front crossbeam I are recessed upwards to form a slot VII;

The left and right ends of the rear crossbeam are provided with a plug-in portion II, and the side wall of the plug-in portion II is recessed inwards to form a slot IX;

The left and right ends of the front crossbeam are provided with a plug-in portion III, and the side wall of the plug-in portion III is recessed inwards to form a slot XIV;

After assembly, the side end of the seat panel is placed in the opening, the slot IV is engaged with the slot VI, the slot III is engaged with the bottom for the front side wall of the opening, the rear side of the side panel is placed in the avoidance groove, and the slot V is engaged with the slot I. The plug-in portion I is embedded into the slot II, the support portion abuts against the lower end of the convex portion, the slot VII is engaged with the lower side wall of the slot VIII, the plug-in portion II is inserted into the slot XI, the slot IX is engaged with the slot XI, the plug-in portion III is inserted into the slot XIII, and the slot XIV is engaged with the inner wall of the slot XIII.

Preferably, a snap-fitting portion I is provided on the inner walls of both sides of the slot XI, a restricted portion I is provided on the snap-fitting portion I, and the restricted portion I divides the slot XI into an insertion area I and a restricted area I; and the front and rear sides of the plug-in portion II are recessed inwards to form the slot IX;

When the plug-in portion II is inserted into the insertion area I and moves from the insertion area I to the restricted area I, the snap-fitting portion I is inserted into the slot IX, and the restricted portion I movably abuts against the upper end of the plug-in portion II to limit the plug-in portion II within the restricted area I.

Preferably, a connecting portion I is formed between the plug-in portion II and the rear crossbeam, the connecting portion I is wide at the top and narrow at the bottom, and the upper and lower parts of the connecting portion I are transitioned through an arc surface I;

When the connecting portion I is inserted into the restricted area I, the snap-fitting portion I movably abuts against the connecting portion I.

Preferably, a snap-fitting portion III is provided on the inner walls of both sides of the slot XIII, a restricted portion II is provided on the snap-fitting portion III, and the restricted portion II divides the slot XIII into an insertion area II and a restricted area II; and the front and rear sides of the plug-in portion III are recessed inwards to form the slot XIV;

When the plug-in portion III is inserted into the insertion area II and moves from the insertion area II to the restricted area II, the restricted portion II movably abuts against the upper end of the plug-in portion III to limit the plug-in portion III within the restricted area II;

A connecting portion II is formed between the plug-in portion III and the front crossbeam II, the connecting portion II is wide at the top and narrow at the bottom, and the upper and lower parts of the connecting portion II are transitioned through an arc surface II;

When the connecting portion II is inserted into the restricted area II, the snap-fitting portion III movably abuts against the connecting portion II.

Preferably, the side panels are provided with front support legs and rear support legs, and the rear support legs are provided in a tilted manner;

Wherein, the front end of the rear support leg is connected with the rear side of the front support leg in the middle part, and the upper side in the front half of the rear support leg is movably abutted against the lower end of the seat panel;

Alternatively, a support rod and a stiffener are provided between the rear support legs and the front support legs, and the upper end of the support rod is movably abutted against the lower end of the seat panel.

Preferably, the front end of the convex portion is bent downwards to form an arc-shaped edge, the side end of the side panel is provided with a supporting protrusion, and the supporting protrusion is movably abutted against the lower end of the arc-shaped edge.

Preferably, armrests are provided at the upper end of the side panels, and the lower end of the armrest is recessed upwards to form a slot XII, and the rear side end of the slot XII is connected to the outside world; a snap-fitting portion II is provided on the upper end face of the side panel, and the snap-fitting portion II is slidably inserted into the slot XII; and the slot XII is narrow at the top and wide at the bottom, and the snap-fitting portion II is wide at the top and narrow at the bottom.

Preferably, a support platform is provided at the front end of the side panel, one side of the support platform is flush with the side end of the side panel, and the other side protrudes from the side end of the side panel. A through hole is opened at the front end of the armrest, and the through hole is used for placing a water cup. The support platform is used to support the lower end of the water cup.

Preferably, at least one reinforcing rib groove is provided respectively on the side panels, the seat panel, the backrest, the front crossbeam I, the front crossbeam II and the rear crossbeam;

When at least two reinforcing rib grooves are provided on the side panels, the spacing between two adjacent reinforcing rib grooves is less than 5 cm.

Preferably, when the side panels, the seat panel, the backrest, the front crossbeam I, the front crossbeam II and the rear crossbeam are hollow, the bottoms of the reinforcing rib grooves on the opposite sides of the side panels, the backrest, the front crossbeam II and the rear crossbeam adhere to each other; and the bottoms of the reinforcing rib grooves on one side of the seat panel and the front crossbeam I adhere to the other side.

Compared with the prior art, the present technical solution has the following outstanding and beneficial technical effects that:

• • 1. The seat panel and the backrest designed in the present technical solution are respectively snap-fitted with the side panels, and do not need to be additionally connected and fixed with fasteners such as screws. Assembly and disassembly are quick and convenient, and the fasteners are avoided from being exposed and affecting the appearance, thereby improving the aesthetics of the chair.
  • 2. The front crossbeam I and the front crossbeam II designed in the present technical solution can connect and fix the front ends of the two side panels, thereby preventing the two side panels from moving due to force, ensuring a stable connection between the side panels and the seat panel, and improving the overall load-bearing capacity of the side panels. Meanwhile, the lower end of the front crossbeam I abuts against the lower end of the seat panel, thereby improving the bearing capacity of the front end for the seat panel, and preventing the front end of the seat panel from being deformed due to force.
  • 3. The rear ends of the two side panels designed in the present technical solution are connected with a rear crossbeam, which improves the connection stability between the two side panels, ensures the load-bearing capacity of the seat panel, and avoids displacement or tilting of the two side panels due to excessive force on the seat panel.
  • 4. The reinforcing rib grooves designed in the present technical solution can ensure the structural strength of each component and save costs. The design of the reinforcing rib grooves makes the chair stable and durable, and improves the sense of design and the three-dimensional sense for the chair.

BRIEF DESCRIPTION OF THE DRAWINGS

In order to more clearly explain the technical solutions in the present disclosure or the prior art, drawings required in the embodiments or the prior art will be briefly described below. Obviously, the drawings in the following description are some embodiments of the present disclosure. For those skilled in the art, other drawings may be obtained from these drawings without any creative effort.

FIG. 1 is a schematic diagram of the structure of Embodiment 1.

FIG. 2 is an exploded view of Embodiment 1.

FIG. 3 is a schematic diagram of the structure of Embodiment 2.

FIG. 4 is a schematic diagram of the structure of the side panels and rear crossbeam in Embodiment 2.

FIG. 5 is a schematic diagram of the structure of the side panels and armrest in Embodiment 2.

FIG. 6 is a sectional view of Embodiment 2.

FIG. 7 is a schematic diagram of the structure of the seat panel and armrest in Embodiment 2.

FIG. 8 is a schematic diagram of the structure of Embodiment 3.

FIG. 9 is a partial exploded view of Embodiment 3.

Reference numerals: 1. Side panel; 10. Armrest portion; 11. Opening; 111. Slot VI; 12. Slot I; 13. Slot II; 14. Snap-fitting portion II; 15. Slot VIII; 16. Slot XI; 161. Insertion area I; 162. Restricted area I; 163. Snap-fitting portion I; 164. Restricted portion I; 171. Front support leg; 172. Rear support leg; 173. Support rod; 174. Stiffener; 18. Supporting protrusion; 19. Support platform; 100. Slot XIII; 101. Snap-fitting portion III; 102. Restricted portion II; 103. Insertion area II; 104. Restricted area II; 2. Seat panel; 21. Slot III; 22. Slot IV; 23. Arc-shaped edge; 24. Convex portion; 3. Backrest; 31. Slot V; 32. Plug-in portion I; 33. Avoidance groove; 331. Avoidance opening; 4. Front crossbeam I; 41. Slot VII; 42. Support portion; 5. Fear crossbeam; 51. Plug-in portion II; 52. Slot IX; 53. Connection portion I; 6. Reinforcing rib groove; 7. Armrest; 71. Slot XII; 72. Through hole; 8. Front crossbeam II; 81. Plug-in portion III; 82. Slot IV; 83. Connection portion II.

DETAILED DESCRIPTION OF THE EMBODIMENTS

The present technical solution will be further described below with reference to specific embodiment in conjunction with the drawings, see FIGS. 1 to 9:

Embodiment 1

An assembled chair, comprises: two side panels 1, a seat panel 2, a backrest 3, a front crossbeam I 4, a front crossbeam II 8 and a rear crossbeam 5;

The upper part of the two side panels 1 is provided with an opening 11. The opening 11 is wide at the top and narrow at the bottom, and the bottom for the rear side wall of the opening 11 is recessed backward to form a slot VI 111. The upper end of the side panel 1 is provided with an armrest portion 10, and the rear side for the upper end face of the side panel 1 is recessed downwards to form a slot I 12, i.e. the rear part of the armrest portion 10 is recessed to form a slot I 12. A slot VIII 15 is provided in the middle of the front side of the side panel 1, and the upper edge of the slot VIII 15 is below the lower edge of the opening 11. A slot II 13 is provided on the rear side of the side panel 1, and a slot XI 16 is provided on the rear side wall in the lower half of the side panel 1;

Both sides of the rear end face for the seat panel 2 are recessed forwards to form a slot IV 22, and the width of the slot IV 22 matches the thickness of the side panel 1. Both left and right sides of the front end face of the seat panel 2 are recessed backward to form a slot III 21 that matches the thickness of the side panel 1, and the front end face of the seat panel 2 between the two slots III 21 extends forwards to form a convex portion 24;

The left and right side edges in the lower half of the backrest 3 are both recessed inwards to form avoidance grooves 33, the upper side wall of the avoidance groove 33 is recessed upwards to form a slot V 31, and the lower side wall of the avoidance groove 33 is protruded to form a plug-in portion I 32;

The front crossbeam I 4 protrudes upwards in the middle to form a support portion 42, and the lower sides at the left and right ends of the front crossbeam I 4 are recessed upwards to form a slot VII 41;

The left and right ends of the rear crossbeam 5 are provided with a plug-in portion II 51, and the plug-in portion II 51 is provided with a slot IX 52;

After assembly, the side end of the seat panel 2 is placed in the opening 11, the slot IV 22 is engaged with the slot VI 111, the slot III 21 is engaged with the bottom for the front side wall of the opening 11, the rear side of the side panel 1 is placed in the avoidance groove 33, and the slot V 31 is engaged with the slot I 12. The plug-in portion I 32 is embedded into the slot II 13, the support portion 42 abuts against the lower end of the convex portion 24, the slot VII 41 is engaged with the lower side wall of the slot VIII 15, the plug-in portion II 51 is inserted into the slot XI 16, and the slot IX 52 is engaged with the slot XI 16 for tight connection.

First, insert the side end of the seat panel 2 into the opening 11, making the slot IV 22 and the slot VI 111 engaged for tight connection. Then rotate the front end of the seat panel 2 with the slot VI 111 as the center of the circle, making the slot III 21 and the bottom of the front side wall for the opening 11 engaged for tight connection, and the inner walls slightly close to the outside for the slot IV 22 and the slot III 21 abut against the side end of the side panel 1, thereby improving the load-bearing capacity of the seat panel 2 in the middle part.

When the side panel 1 and the backrest 3 are installed, the upper half of the side panel 1 can be placed in the avoidance groove 33, making the upper side wall of the avoidance groove 33 placed on the upper end face of the side panel 1, so that engagement and connection of the slot V 31 and the slot I 12 are achieved.

First insert the end part of the front crossbeam I 4 into the slot VIII 15, and then the front crossbeam I 4 moves downward, making the slot VII 41 and the lower side wall of the slot VIII 15 engaged for tight connection. When the seat panel 2 is installed on the side panel 1, the support portion 42 abuts against the lower end of the convex portion 24 to support the front end of the seat panel 2, preventing the seat panel 2 from being bent and deformed due to excessive force.

The side panel 1 located at the rear side wall of the opening 11 is tilted. When the backrest 3 is installed on the side panel 1, the side wall of the backrest 3 is flush with the rear side in the upper half of the side panel 1, making the backrest 3 tilted after installation, which is convenient for fitting with the back of a person and improves the comfort of use.

An avoidance opening 331 is provided on the lower side wall of the avoidance groove 33, making the lower edge of the backrest 3 protrude to form a plug-in portion I 32, and the bottom of the avoidance opening 331 abuts against the edge of the side panel 1.

The lower side of the plug-in portion II 51 is recessed upwards to form a slot IX 52. When the plug-in portion II 51 is inserted into the slot XI 16, the rear crossbeam 5 moves downwards, making the slot IX 52 and the lower side wall of the slot XI 16 engaged for tight connection;

Alternatively, the front and rear sides of the plug-in portion II 51 are recessed inwards to form a slot IX 52;

A snap-fitting portion I 163 is provided on the inner walls of both sides of the slot XI 16, a restricted portion I 164 is provided on the snap-fitting portion I 163, and the restricted portion I 164 divides the slot XI 16 into an insertion area I 161 and a restricted area I 162;

When the plug-in portion II 51 is inserted into the insertion area I 161 and moves from the insertion area I 161 to the restricted area I 162, the snap-fitting portion I 163 is inserted into the slot IX 52, and the restricted portion I 164 movably abuts against the upper end of the plug-in portion II 51 to limit the plug-in portion II 51 within the restricted area I 162.

A connecting portion I 53 is formed between the rear end of the plug-in portion II 51 and the rear crossbeam 5, and the bottom of the slot IX 52 is the side wall of the connecting portion I 53. The connecting portion I 53 is wide at the top and narrow at the bottom, and the upper and lower parts of the connecting portion I 53 are transitioned by an arc surface I. The arc surface I can guide the restricted portion I 164 to slide on the side end surface of the connecting portion I 53. When the plug-in portion II 51 is inserted into the slot XI 16 and the connecting portion I 53 is inserted into the restricted area I 162, the snap-fitting portion I 163 movably abuts against the side end of the connecting portion I 53, and the restricted portion 164 movably abuts against the upper end of the connecting portion I 53. When the connecting portion I 53 is inserted into the connecting portion I 53 from top to bottom, the force of the snap-fitting portion I 163 abutting against the connecting portion I 53 is increased, thereby improving the structural strength and stability of the connection, and ensuring that the rear crossbeam 5 after connection is not prone to shaking.

At least one reinforcing rib groove 6 is provided respectively on the side panels 1, the seat panel 2, the backrest 3, the front crossbeam I 4, and the rear crossbeam 5;

The reinforcing rib groove 6 is provided respectively on the opposite sides of the side panels 1, the backrest 3, and the rear crossbeam 5;

When at least two reinforcing rib grooves 6 are provided on the side panels 1, the spacing between two adjacent reinforcing rib grooves 6 is less than 5 cm.

When the side panels 1, seat panel 2, backrest 3, front crossbeam I 4 and rear crossbeam 5 are hollow, the outer sides at the bottom of the reinforcing rib grooves 6 on the opposite sides of the side panels 1, backrest 3 and rear crossbeam 5 adhere to each other; the outer sides at the bottom of the reinforcing rib grooves 6 on one side of the seat panel 2 and the front crossbeam I 4 adhere to the other side, the upper end face of the seat panel 2 is not provided with the reinforcing rib groove 6, and the front side of the front crossbeam I 4 is not provided with the reinforcing rib groove 6, so that the structural strength can be guaranteed while saving production materials, and the structural stability of the chair is ensured.

The side panels 1 are provided with front support legs 171 and rear support legs 172, and the rear support legs 172 are provided in a tilted manner;

A support rod 173 and a stiffener 174 are provided between the rear support legs 172 and the front support legs 171, the upper end of the support rod 173 is movably abutted against the lower end of the seat panel 2, and the upper end of the support rod 173 is the lower end edge of the opening 11.

The bottom end of the backrest 3 is in a wave shape, which improves the anti-deformation capability of the backrest 3.

Embodiment 2

The design scheme of the present embodiment is basically the same as that of Embodiment 1, except that:

The front end of the rear support leg 172 is connected with the rear side of the front support leg 171 in the middle part, the upper side in the front half of the rear support leg 172 is movably abutted against the lower end of the seat panel 2, and the front half part of the rear support leg 172 is the lower edge of the opening 11;

The front end of the convex portion 24 is bent downwards to form an arc-shaped edge 23. The arc-shaped edge 23 blocks the front crossbeam I 4, so that aesthetics is increased. The side end of the side panel 1 is provided with a supporting protrusion 18, and the supporting protrusion 18 is movably abutted against the lower end of the arc-shaped edge 23 or is abutted against the lower end of the convex portion 24 to support the lower end of the seat panel 2.

Armrests 7 are provided at the upper end of the side panels 1, and the lower end of the armrest 7 is recessed upwards to form a slot XII 71, and the rear side end of the slot XII 71 is connected to the outside world; a snap-fitting portion II 14 is provided on the upper end face of the side panel 1, and the snap-fitting portion II 14 is slidably inserted into the slot XII 71; and the slot XII 71 is narrow at the top and wide at the bottom, and the snap-fitting portion II 14 is wide at the top and narrow at the bottom, preventing the armrest 7 from being disengaged from the upper end of the snap-fitting portion II 14. Specifically, the bottom of the slot XII 71 is wider than the opening, and the upper end face of the snap-fitting portion II 14 close to the side panel 1 is narrower.

A support platform 19 is provided at the front end for one of the side panels 1, one side of the support platform 19 is flush with the side end of the side panel 1, and the other side protrudes from the side end of the side panel 1. After the assembly, the protruded side of the support platform 19 is away from the seat panel 2. A through hole 72 is opened at the front end of the armrest 7, and the through hole 72 is used for placing a water cup. The support platform 19 is used to support the lower end of the water cup.

As shown in FIG. 7, an avoidance groove is set on the rear side of the seat panel 2, and the bottom of the avoidance groove has a curved protrusion. The backrest 3 is set in a curved manner, with the curvature adapted to the curved protrusion. When assembled, the curved protrusion abuts against the front side at the lower end of the backrest 3.

The seat panel 2 is provided with a plurality of strip-shaped air holes, and the seat panel 2 is integrally formed, so that when the rear end of the seat panel 2 is subjected to gravity, the seat panel 2 can be recessed and deformed as a whole, so as to better fit the human body and improve the user experience.

Embodiment 3

The design scheme of the present embodiment is basically the same as that of Embodiment 1, except that:

Referring to FIGS. 8 and 9, a front crossbeam II 8 is provided between the front lower halves of the two side panels 1 to improve the connection stability between the front halves of the two side panels 1. The structure of the front crossbeam II 8 is the same as that of the rear crossbeam 5, and the connection structure between the front crossbeam II 8 and the two side panels 1 is the same as that between the rear crossbeam 5 and the two side panels 1, except that the setting angles of the slot XIII 100 and the slot XI 16 on the side panels 1 are different;

Specifically, a slot XIII 100 is provided on the front side wall at the lower half of the side panel 1, and a plug-in portion III 81 is provided at both the left and right ends of the front crossbeam II 8, and the side wall of the plug-in portion III 81 is recessed inwards to form a slot XIV 82; and the plug-in portion III 81 is inserted into the slot XIII 100, and the slot XIV 82 is embedded with the inner wall of the slot XIII 100;

Further, a snap-fitting portion III 101 is provided on the inner walls of both sides of the slot XIII 100, a restricted portion II 102 is provided on the snap-fitting portion III 101, and the restricted portion II 102 divides the slot XIII 100 into an insertion area II 103 and a restricted area II 104; and the front and rear sides of the plug-in portion III 81 are recessed inwards to form the slot XIV 82;

When the plug-in portion III 81 is inserted into the insertion area II 103 and moves from the insertion area II 103 to the restricted area II 104, the restricted portion II 102 movably abuts against the upper end of the plug-in portion III 81 to limit the plug-in portion III 81 within the restricted area II 104;

A connecting portion II 83 is formed between the plug-in portion III 81 and the front crossbeam II 8, the connecting portion II 83 is wide at the top and narrow at the bottom, and the upper and lower parts of the connecting portion II 83 are transitioned through an arc surface II; and when the connecting portion II 83 is inserted into the restricted area II 104, the snap-fitting portion III 101 movably abuts against the connecting portion II 83.

At least one reinforcing rib groove 6 is also provided on the front crossbeam II 8; and when the front crossbeam II 8 is hollow, the bottoms of the reinforcing rib grooves 6 on the opposite sides of the front crossbeam II 8 adhere to each other.

The above shows and describes the basic principles, main features and advantages of the present technical solution. It should be understood by those skilled in the industry that the present technical solution is not limited to the above embodiment. The description in the above embodiment and specification are only used for explaining the principles of the present technical solution. Without departing from the spirit and scope of the present technical solution, the present technical solution may have various variations and improvements, which fall within the protection scope of the present technical solution. The required protection scope of the present technical solution is defined by the attached claims and their equivalents.

It should be noted that the structure, proportion, size, etc. plotted in the drawings of this specification are only used to match the contents disclosed in the specification. They are used for people familiar with this technology to understand and read, and are not used to restrict the limitations for the implementation of the present technical solution, so they have no substantial technical significance. Any modifications of the structure, changes in the proportional relationship, or adjustments of the size, without affecting the effects and purposes that can be achieved by the present technical solution, should still fall within the scope of the technical content disclosed by the present technical solution. At the same time, the terms such as “upper”, “lower”, “left”, “right”, “middle” and “a” quoted in this specification are only for the convenience of description, and are not used to limit the implementation scope of the present technical solution. The change or adjustment of their relationship without substantially changing the technical content should also be considered to fall within the implementation scope of the present technical solution.

It should also be noted that, when an element is referred to as being “fixed on” or “provided on” another element, it may be directly located on the other element or there may be an intermediate element at the same time. When an element is referred to as being “connected with” another element, it may be directly connected with the other element or may be indirectly connected with another element through an intermediate element.

In addition, the descriptions of “first”, “second”, etc. in the present application are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as “first” and “second” may explicitly or implicitly include at least one of the features. Furthermore, the technical solutions of the various embodiment can be combined with each other, but they must be based on the fact that the ordinary technicians in this field can implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by the present application.