EXTERNAL CIRCULATING DEVICE FOR CIRCULARLY GRINDING ROLLING SURFACE OF BEARING ROLLER

Description

CROSS-REFERENCE TO RELATED APPLICATIONS

This application claims foreign priority of Chinese Patent Application No. 202311102378.8, filed on Aug. 29, 2023 in the China National Intellectual Property Administration, the disclosures of all of which are hereby incorporated by reference.

TECHNICAL FIELD

The present invention relates to an external circulating device for circularly grinding a rolling surface of a bearing roller, and belongs to the technical field of precision machining of bearing rollers.

BACKGROUND OF THE PRESENT INVENTION

Roller bearings are widely used in various rotating machines. As one of the important parts of the roller bearing, a size consistency of a rolling surface of a bearing roller has an important influence on performances of the rolling bearing.

At present, known bearing rollers comprise a cylindrical roller, a tapered roller and a spherical roller, and a processing technology of the rolling surface of the bearing roller is as follows: blank forming (turning or cold heading or rolling), rough machining (soft grinding of rolling surface), heat treatment, semi-finishing (hard grinding of rolling surface) and finish machining, wherein the known main processing method for the finish machining of the rolling surface is centerless grinding+superfinishing. However, due to a maternal machining principle of centerless grinding and superfinishing, it is difficult to effectively improve diameter dispersion of the rolling surface of the bearing roller.

Patent literature with a publication number of CN113524018A discloses a grinding tool kit, device and method used for finishing a rolling surface of a cylindrical roller, and the device comprises a main machine, an external circulating device and a grinding tool kit. The grinding tool kit comprises a grinding sleeve and a grinding strip assembly, the grinding strip assembly comprises a plurality of grinding strips provided with linear grooves in front surfaces of the grinding strips, and an inner surface of the grinding sleeve is provided with a cylindrical spiral groove. During grinding processing, one processed cylindrical roller is distributed at each intersection of the spiral groove and the linear groove. Corresponding to each intersection, an area enclosed by a working surface of the spiral groove and a working surface of the linear groove is a grinding processing area. As shown in FIG. 1 (original FIG. 13), the external circulating device comprises a collection unit, a sorting unit, a feeding unit and a transmission subsystem. The collection unit is arranged at an exit of the spiral groove, and is used for collecting cylindrical rollers leaving the grinding processing area from an exit of each spiral groove. The sorting unit is used for sorting the cylindrical rollers into a queue required by the feeding unit. For a grinding strip assembly rotary main machine, the feeding unit is arranged at an entrance of the spiral groove for feeding the cylindrical roller into the linear groove; and for a grinding sleeve rotary main machine, the feeding unit is arranged at one end of the grinding sleeve located at the entrance of the spiral groove for feeding the cylindrical roller into the entrance of the spiral groove. The transmission subsystem is used for transmitting the cylindrical rollers between various units in the external circulating device. In the grinding processing, a path of the cylindrical roller in the external circulating device is: from the exit of the spiral groove to the entrance of the spiral groove through the collection unit, the sorting unit and the feeding unit in turn.

Patent literature with a publication number of CN113601277A discloses a grinding tool kit, device and method used for finishing a rolling surface of a tapered roller, and the device comprises a main machine, an external circulating device and a grinding tool kit. The grinding tool kit comprises a grinding sleeve and a grinding strip assembly, the grinding strip assembly comprises a plurality of grinding strips provided with linear grooves in front surfaces of the grinding strips, and an inner surface of the grinding sleeve is provided with a cylindrical spiral groove. During grinding processing, one processed tapered roller is distributed at each intersection of the spiral groove and the linear groove. Corresponding to each intersection, an area enclosed by a working surface of the spiral groove and a working surface of the linear groove is a grinding processing area. As shown in FIG. 2 (original FIG. 15), the external circulating device comprises a collection unit, a sorting unit, a feeding unit and a transmission subsystem. The collection unit is arranged at an exit of the spiral groove, and is used for collecting tapered rollers leaving the grinding processing area from an exit of each spiral groove. The sorting unit is used for sorting the tapered rollers into a queue required by the feeding unit, and adjusting pointing directions of small-head ends of the tapered rollers to be consistent. For a grinding strip assembly rotary main machine, the feeding unit is arranged at an entrance of the spiral groove for feeding the tapered roller into the linear groove; and for a grinding sleeve rotary main machine, the feeding unit is arranged at one end of the grinding sleeve located at the entrance of the spiral groove for feeding the tapered roller into the entrance of the spiral groove. The transmission subsystem is used for transmitting the tapered rollers between various units in the external circulating device. In the grinding processing, a path of the tapered roller in the external circulating device is: from the exit of the spiral groove to the entrance of the spiral groove through the collection unit, the sorting unit and the feeding unit in turn.

Patent literature with a publication number of CN113524014A discloses a grinding tool kit, device and method used for finishing a rolling surface of a spherical roller, and the device comprises a main machine, an external circulating device and a grinding tool kit. An inner surface of a grinding sleeve is provided with a first spiral groove. The grinding tool kit comprises the grinding sleeve and a grinding strip assembly, the grinding strip assembly comprises a plurality of grinding strips provided with linear grooves in front surfaces of the grinding strips, or a second spiral groove. During grinding processing, one processed spherical roller is distributed at each intersection of the first spiral groove and the groove of the grinding strip. Corresponding to each intersection, an area enclosed by a working surface of the first spiral groove and a working surface of the groove of the grinding strip is a grinding processing area. As shown in FIG. 3 (original FIG. 26), the external circulating device comprises a collection unit, a sorting unit, a feeding unit and a transmission subsystem. The collection unit is arranged at an exit of the first spiral groove, and is used for collecting spherical rollers leaving the grinding machining area from the exit of each first spiral groove. When the spherical roller is a symmetric spherical roller without a symmetric spherical roller or a symmetric spherical roller with a spherical base surface, the sorting unit is used for sorting the spherical rollers into a queue required by the feeding unit. When the spherical roller is an asymmetric spherical roller, the sorting unit is used for sorting the spherical rollers into a queue required by the feeding unit, and adjusting pointing directions of small-head ends of the spherical rollers to be consistent. The transmission subsystem is used for transmitting the spherical rollers between various units in the external circulating device. For a grinding strip assembly rotary main machine, the feeding unit is arranged at an entrance of the first spiral groove for feeding the spherical roller into the groove of the grinding strip. For a grinding sleeve rotary main machine, the feeding unit is arranged at one end of the grinding sleeve located at the entrance of the first spiral groove for feeding the spherical roller into the entrance of the first spiral groove. In the grinding processing, a path of the cylindrical roller in the external circulating device is: from the exit of the spiral groove to the entrance of the first spiral groove through the collection unit, the sorting unit and the feeding unit in turn.

Patent literature with a publication number of CN108908094A discloses a grinding disc, device and method used for finishing a rolling surface of a cylindrical roller, and the device comprises a main machine, a grinding disc kit and an external roller circulating disc system. The grinding disc kit comprises a first grinding disc and a second grinding disc. A front surface of the first grinding disc comprises a group of linear grooves distributed radially, and a front surface of the second grinding disc comprises one or more spiral grooves. During grinding processing, one processed cylindrical roller is distributed at each intersection of the spiral groove of the second grinding disc and the linear groove of the first grinding disc. Corresponding to each intersection, an area enclosed by a working surface of the linear groove of the first grinding disc and a working surface of the spiral groove of the second grinding disc is a grinding processing area. As shown in FIG. 4 (original FIG. 18), the external roller circulating disc system comprises a roller collecting apparatus, a roller conveying system, a roller sorting mechanism and a roller feeding mechanism. The roller collecting apparatus is arranged at an exit of each linear groove of the first grinding disc, and is used for collecting cylindrical rollers leaving the grinding processing area from the exit of each spiral groove. The roller sorting mechanism is arranged at a front end of the roller feeding mechanism, and is used for adjusting an axis of the cylindrical roller to a direction required by the roller feeding mechanism. Corresponding to the first main machine configuration, the roller feeding mechanism is respectively installed at the entrance of each spiral groove of the second grinding disc, and is used for pushing the cylindrical roller into the entrance of the linear groove of the first grinding disc. Corresponding to the second main machine configuration, the roller feeding mechanism is respectively installed at the entrance of each linear groove of the first grinding disc, and is used for pushing the cylindrical roller into the entrance of the linear groove of the first grinding disc. The roller conveying system is used for conveying the cylindrical roller from the roller collecting apparatus to the roller feeding mechanism. In the grinding processing, a path of the cylindrical roller in the external roller circulating disc system is: from the exit of the linear groove of the first grinding disc to the entrance of the linear groove of the first grinding disc through the roller collecting apparatus, the roller conveying system, the roller sorting mechanism and the roller feeding mechanism in turn.

Patent literature with a publication number of CN108890516A discloses a grinding disc, device and method used for finishing a rolling surface of a circular arc convex cylindrical roller, and the device comprises a main machine, a grinding disc kit and an external roller circulating disc system. The grinding disc kit comprises one pair of coaxial first and second grinding discs with opposite front surfaces, wherein the front surface of the first grinding disc comprises one group of concave arc grooves distributed radially, and the front surface of the second grinding disc comprises one or more spiral grooves with convex circular arc rotating surface. During grinding processing, one processed circular arc convex cylindrical roller is distributed at each intersection of the spiral groove of the second grinding disc and the concave arc groove of the first grinding disc. Corresponding to each intersection, an area enclosed by a working surface of the concave arc groove of the first grinding disc and a working surface of the spiral groove of the second grinding disc is a grinding processing area. As shown in FIG. 5 (original FIG. 19), the external roller circulating disc system comprises a roller collecting apparatus, a roller conveying system, a roller sorting mechanism and a roller feeding mechanism. The roller collecting apparatus is arranged at an exit of each concave arc groove of the first grinding disc, and is used for collecting circular arc convex cylindrical rollers leaving the grinding processing area from an exit of each concave arc groove. The roller sorting mechanism is arranged at a front end of the roller feeding mechanism, and is used for adjusting an axis of the circular arc convex cylindrical roller to a direction required by the roller feeding mechanism. The roller conveying system is used for conveying the circular arc convex cylindrical roller from the roller collecting apparatus to the roller feeding mechanism. Corresponding to the first main machine configuration, the roller feeding mechanism is installed at the entrance of each spiral groove of the second grinding disc, and is used for pushing the circular arc convex cylindrical roller into the entrance of the concave arc groove of the first grinding disc. Corresponding to the second main machine configuration, the roller feeding mechanism is installed at the entrance of each concave arc groove of the first grinding disc, and is used for pushing the circular arc convex cylindrical roller into the entrance of the concave arc groove of the first grinding disc. In the grinding processing, a path of the circular arc convex cylindrical roller in the external roller circulating disc system is: from the exit of the concave arc groove of the first grinding disc to the entrance of the concave arc groove of the first grinding disc through the roller collecting apparatus, the roller conveying system, the roller sorting mechanism and the roller feeding mechanism in turn.

Patent literature with a publication number of CN108723979A discloses a grinding disc, device and method used for finishing a rolling surface of a tapered roller, and the device comprises a main machine, a grinding disc kit and an external roller circulating disc system. The grinding disc kit comprises a first grinding disc and a second grinding disc. A front surface of the first grinding disc comprises a group of linear grooves distributed radially, and a front surface of the second grinding disc comprises one or more spiral grooves. During grinding processing, one processed tapered roller is distributed at each intersection of the spiral groove of the second grinding disc and the linear groove of the first grinding disc. Corresponding to each intersection, an area enclosed by a working surface of the linear groove of the first grinding disc and a working surface of the spiral groove of the second grinding disc is a grinding processing area. As shown in FIG. 6 (original FIG. 20), the external roller circulating disc system comprises a roller collecting apparatus, a roller conveying system, a roller sorting mechanism and a roller feeding mechanism. The roller collecting apparatus is arranged at an exit of each linear groove of the first grinding disc, and is used for collecting tapered rollers leaving the grinding processing area from the exit of each spiral groove. The roller sorting mechanism is arranged at a front end of the roller feeding mechanism, and is used for adjusting an axis of the tapered roller to a direction required by the roller feeding mechanism, and adjusting a pointing direction of a small-head end of the tapered roller to a pointing direction suitable for a cross-sectional profile of the working surface of the spiral groove of the second grinding disc. Corresponding to the first main machine configuration, the roller feeding mechanism is respectively installed at the entrance of each spiral groove of the second grinding disc, and is used for pushing the tapered roller into the entrance of the linear groove of the first grinding disc. Corresponding to the second main machine configuration, the roller feeding mechanism is respectively installed at the entrance of each linear groove of the first grinding disc, and is used for pushing the tapered roller into the entrance of the linear groove of the first grinding disc. The roller conveying system is used for conveying the tapered roller from the roller collecting apparatus to the roller feeding mechanism. In the grinding processing, a path of the tapered roller in the external roller circulating disc system is: from the exit of the linear groove of the first grinding disc to the entrance of the linear groove of the first grinding disc through the roller collecting apparatus, the roller conveying system, the roller sorting mechanism and the roller feeding mechanism in turn.

Patent literature with a publication number of CN108673331A discloses a grinding disc, device and method used for finishing a rolling surface of a circular arc convex tapered roller, and the device comprises a main machine, a grinding disc kit and an external roller circulating disc system. The grinding disc kit comprises one pair of coaxial first and second grinding discs with opposite front surfaces, wherein the front surface of the first grinding disc comprises one group of concave arc grooves distributed radially, and the front surface of the second grinding disc comprises one or more spiral grooves with convex circular arc rotating surface. During grinding processing, one processed circular arc convex tapered roller is distributed at each intersection of the spiral groove of the second grinding disc and the concave arc groove of the first grinding disc. Corresponding to each intersection, an area enclosed by a working surface of the concave arc groove of the first grinding disc and a working surface of the spiral groove of the second grinding disc is a grinding processing area. As shown in FIG. 7 (original FIG. 20), the external roller circulating disc system comprises a roller collecting apparatus, a roller conveying system, a roller sorting mechanism and a roller feeding mechanism. The roller collecting apparatus is arranged at an exit of each concave arc groove of the first grinding disc, and is used for collecting circular arc convex tapered rollers leaving the grinding processing area from an exit of each concave arc groove. The roller sorting mechanism is arranged at a front end of the roller feeding mechanism, and is used for adjusting an axis of the circular arc convex tapered roller to a direction required by the roller feeding mechanism, and adjusting a pointing direction of a small-head end of the circular arc convex tapered roller to a pointing direction suitable for a cross-sectional profile of the working surface of the spiral groove of the second grinding disc. Corresponding to the first main machine configuration, the roller feeding mechanism is respectively installed at the entrance of each spiral groove of the second grinding disc, and is used for pushing the circular arc convex tapered roller into the entrance of the concave arc groove of the first grinding disc. Corresponding to the second main machine configuration, the roller feeding mechanism is respectively installed at the entrance of each concave arc groove of the first grinding disc, and is used for pushing the circular arc convex tapered roller into the entrance of the concave arc groove of the first grinding disc. The roller conveying system is used for conveying the circular arc convex tapered roller from the roller collecting apparatus to the roller feeding mechanism. In the grinding processing, a path of the circular arc convex tapered roller in the external roller circulating disc system is: from the exit of the concave arc groove of the first grinding disc to the entrance of the concave arc groove of the first grinding disc through the roller collecting apparatus, the roller conveying system, the roller sorting mechanism and the roller feeding mechanism in turn.

The processing methods disclosed in the above patent literatures belong to precision evolution processing methods, which have the abilities of removing more rolling surface materials of bearing rollers with larger diameter and less rolling surface materials of bearing rollers with smaller diameter, and are beneficial to improving size consistency of the rolling surfaces of the bearing rollers in quantity production. The “grinding processing area” mentioned in these patent literatures may be integrated as an area where the processed bearing roller plays a grinding role, and the “entrance of the spiral groove”, the “entrance of the first spiral groove”, the “entrance of the linear groove”, and the “entrance of the concave arc groove” may be integrated as the exit from which the processed bearing roller leaves the grinding processing area. The devices disclosed in the above patent literatures are typical representatives of devices for circularly circulating bearing rollers in the prior art. The external circulating device (external roller circulating disc system) in the disclosed device comprises the collection unit (roller collecting apparatus), the transmission subsystem (roller conveying system), the sorting unit (roller sorting mechanism) and the feeding unit (roller feeding mechanism). In the grinding processing, the path of the bearing roller in the external circulating device is: from the exit of the grinding processing area to the entrance of the grinding processing area through the collection unit (roller collecting apparatus), the sorting unit (roller sorting mechanism) and the feeding unit (roller feeding mechanism) in turn. On one hand, these external circulating devices do not involve a structure related to a mixing mode and a mixing efficiency of the bearing rollers, so the size consistency and convergence efficiency of the bearing rollers cannot be guaranteed. On the other hand, although the positions of the bearing rollers in the grinding area are orderly and the attitudes of the bearing rollers are determined, before entering the grinding area again, it is necessary to adjust the axial direction of the bearing rollers and the pointing directions of the small-head ends of the tapered rollers or the asymmetric spherical rollers by the sorting unit, which means that the bearing rollers are in an uncertain position and attitude at this stage from leaving the grinding area to reaching the roller sorting mechanism. In the process of rapid movement, this position and attitude uncertainty will easily lead to mutual collision between the bearing rollers, thus resulting in a collision injury on the surfaces of the bearing rollers that cannot be ignored.

SUMMARY OF THE PRESENT INVENTION

A bearing roller in the present invention refers to a processed bearing roller, and a grinding processing area in the present invention refers to an area where the bearing roller plays a grinding role. During grinding processing, the bearing roller enters the grinding processing area from an entrance of the grinding processing area and leaves the grinding processing area from an exit of the grinding processing area. The bearing roller is a cylindrical roller, or a tapered roller, or a spherical roller, the cylindrical roller comprises a circular arc convex cylindrical roller and a rolling needle, the tapered roller comprises a circular arc convex tapered roller, and the spherical roller comprises a symmetric spherical roller without a spherical base surface, a symmetric spherical roller with a spherical base surface and an asymmetric spherical roller. The rolling needle is classified as a cylindrical roller in the present invention.

A conveying mechanism according to the present invention is used for conveying the bearing rollers from one place to another place in a manner of single-line queue and attitude control, and the conveying mechanism is a conveying mechanism in the prior art such as a flat belt conveying mechanism and a double-circle belt conveying mechanism, or a conveying mechanism which may be developed in the future and may be used for the purposes provided by the present invention, and a structure of the conveying mechanism is not specifically limited.

A lifting mechanism according to the present invention is used for lifting the bearing rollers upwards from a lower position in a manner of single-isolation and single-line queue and attitude control, and the lifting mechanism is a lifting mechanism in the prior art such as a push plate lifting mechanism and a chain plate lifting mechanism, or a lifting mechanism which may be developed in the future and may be used for the purposes described by the present invention, and a structure of the lifting mechanism is not specifically limited.

According to the patent literatures CN108908094A, CN108890516A, CN108723979A and CN108673331A and drawings thereof, a first grinding disc and a second grinding disc in a grinding disc kit in the prior art are called a lower grinding disc and an upper grinding disc respectively.

The present invention takes into account a change different from the grinding tool kits disclosed in the patent literatures CN113524018A, CN113601277A and CN113524014A, that is, an inner wall of the grinding sleeve is provided with one group of multiple coaxial circular grooves with same diameter instead of cylindrical spiral grooves, and each circular groove is provided with a through port for the bearing roller to enter or leave the grinding processing area and lead to an upper half outer wall of the grinding sleeve. The through port is both the entrance 41 for the bearing roller to enter the grinding processing area and the exit 42 for the bearing roller to leave the grinding processing area, as shown in FIG. 8.

According to the patent literatures CN113524018A, CN113601277A and CN113524014A and the drawings thereof and future technical development, in the present invention, a grinding tool kit comprising a grinding sleeve and the grinding strip assembly is called a shaft sleeve grinding disc kit, the grinding strip assembly is called a grinding shaft, and a linear groove or a spiral groove arranged on the grinding strip assembly is collectively called a grinding shaft groove.

Aiming at the problems existing in the prior art for circularly grinding the bearing rollers, the present invention provides an external circulating device for circularly grinding a rolling surface of a bearing roller. On one hand, the external circulating device of the present invention involves a structure related to a mixing mode and a mixing efficiency of the bearing rollers, which is beneficial for improving size consistency and convergence efficiency of the bearing rollers. On the other hand, due to the unique design of the external circulating device of the present invention, the bearing rollers are always in a state of orderly position and attitude control in the external circulation process, so that the surface of the bearing roller can be effectively prevented from non-negligible collision injury in the external circulating process.

In order to solve the above-mentioned technical problems, the present invention provides an external circulating device for circularly grinding a rolling surface of a bearing roller, comprising a receiving apparatus, a feeding apparatus, a storage station, a plurality of storage bins and a controller;

• • the storage station is used for storing the storage bin; the storage bin is used for temporarily storing the bearing roller, the storage bin comprises one or more storage channels, and the bearing rollers are sequentially stored in the storage channels of the storage bin in a single-line queue with axes parallel to each other and rolling surfaces close to rolling surfaces to reduce the mutual collision between the bearing rollers and avoid collision injury; the storage channels are gradually transited from a channel entrance to a channel exit from top to bottom to facilitate the bearing rollers to roll unpowered in the storage channels under gravities of the bearing rollers; and the storage bin is a hardware foundation for carrying out partitioning adjustment on sequences and positions of the bearing rollers in the bearing roller queue without physical contact between the bearing rollers loaded in different storage bins, and the bearing roller queue is a closed-loop queue comprising all bearing rollers in the grinding processing area and the external circulating device;
  • the receiving apparatus is used for sequentially loading the bearing rollers leaving from the exit of the grinding processing area into an empty storage bin in a manner of queue advancing and attitude control to avoid the bearing rollers from collision injury due to mutual collision;
  • the feeding apparatus is used for unloading the bearing rollers from the selected storage bin in the storage station according to a decision of the controller, and sequentially loading the bearing rollers into the entrance of the grinding processing area according to attitude requirements of the grinding processing area on the bearing rollers in a manner of queue advancing and attitude control and avoiding the bearing rollers from collision injury due to mutual collision;
  • the bearing rollers in the same storage channel enter the storage channel from the channel entrance and leave the storage channel from the channel exit in an order of first-in first-out and last-in last-out;
  • the controller is used for deciding when to unload the bearing rollers from which storage bin; and the controller is a software foundation for carrying out partitioning adjustment on the sequences and the positions of the bearing rollers in the bearing roller queue without physical contact between the bearing rollers loaded in different storage bins;
  • during grinding, the bearing rollers finishing one grinding processing in the grinding processing area leave the grinding processing area from the exit, and the bearing rollers leaving the grinding processing area are temporarily stored in the empty storage bin and stored in the storage station, the bearing rollers are unloaded from the selected storage bin in the storage station according to the decision of the controller and sent to the grinding processing area from the entrance to continue grinding processing, and the sequences and positions of the bearing rollers sent to the grinding processing area in the bearing roller queue are updated according to the decision of the controller, thus realizing partitioning and mixed transposition of the bearing rollers without physical contact between the bearing rollers loaded in different storage bins;
  • a process that all the bearing rollers enter the grinding processing area from the entrance, undergo grinding in the grinding processing area and leave the grinding processing area from the exit is one grinding cycle;
  • sequence and position changes of the bearing rollers leaving the grinding processing area from the exit in the external circulating device in the bearing roller queue change combination of the bearing rollers entering the grinding processing area subsequently, thus extending a material selective removal effect between the bearing rollers in the grinding processing area to the bearing rollers in the whole batch; and with the increase of the grinding cycle, size consistency of the bearing rollers is continuously improved until a specified technical index is achieved; and
  • in order to improve the size consistency of the bearing roller, it is necessary to work out a feeding sequence rule for loading the bearing roller into the entrance, and plan an unloading sequence of the bearing roller from each storage bin in the grinding process according to the feeding sequence rules; and on the one hand, the feeding sequence rule can ensure that grinding cycles experienced by all the bearing rollers are close to each other, and meanwhile, can weaken sequence and position characteristics of the bearing rollers in the bearing roller queue that are compared with each other in the grinding processing area; and
  • the external circulating device is used for deal with the grinding of a large number of bearing rollers with a capacity greater than that of the grinding processing area on one hand; and is used for establishing a logistics channel of the bearing rollers between the exit and the entrance on the other hand; and is used for mixing and transposing the bearing rollers to weaken the sequence and position characteristics of the bearing rollers in the bearing roller queue on yet another aspect.

Further, the external circulating device is a device suitable for circularly grinding the rolling surface of the bearing roller equipped with a grinding disc kit, the grinding disc kit comprises a lower grinding disc and an upper grinding disc, a front surface of the lower grinding disc is provided with one group of at least three linear grooves distributed radially in a plane or a conical surface or concave arc grooves distributed radially, a front surface of the upper grinding disc is correspondingly provided with a plane spiral groove or a conical spiral groove or a convex circular arc rotating surface spiral groove, the entrance of the grinding processing area is arranged at one end of the plane spiral groove or the conical spiral groove or the convex circular arc rotating surface spiral groove adjacent to an inner edge of the upper grinding disc and leads to a back surface of the upper grinding disc, and the exit of the grinding processing area is arranged at one end of the corresponding plane spiral groove or the conical spiral groove or the convex circular arc rotating surface spiral groove adjacent to an outer edge of the upper grinding disc; during grinding processing, there are bearing rollers continuously entering the grinding processing area from the entrance and there are bearing rollers continuously leaving the grinding processing area from the exit; the bearing rollers enter the grinding processing area from the entrance and leave the grinding processing area from the exit synchronously with the grinding process; and the bearing roller is the cylindrical roller or the tapered roller;

• • a storage space of the storage bin is divided into a plurality of storage channels which are parallel to each other, and the storage channels are arranged obliquely relative to a horizontal plane to facilitate the bearing rollers to roll unpowered in the storage channels under gravities of the bearing rollers; a width of the storage channel is matched with an axial length of the bearing roller to restrain an attitude of the bearing roller when rolling in the storage channel to avoid the bearing roller from being stuck; an upper end of the storage channel is the channel entrance, and a lower end of the storage channel is the channel exit and is provided with an exit gate; the bearing rollers are sequentially stored in the storage channels in a single-line queue with axes parallel to each other and rolling surfaces close to rolling surfaces; and the exit gate is in an open state when the bearing roller is unloaded from the storage channel;
  • the storage bin is arranged in the storage station in a layering way;
  • the receiving apparatus comprises a receiving mechanism, a receiving mechanism before the station (78) and a transition mechanism before the station;
  • the receiving mechanism before the station and the transition mechanism before the station are both provided with a storage channel consistent with that in the storage bin;
  • the receiving mechanism comprises a U-shaped guide frame, a bottom supporting plate and a receiving transition channel; the U-shaped guide frame is fixedly connected with the lower grinding disc, a U-shaped opening is opposite to the linear groove or the concave arc groove, and an inner width of the U-shaped guide frame is matched with a diameter of the bearing roller; the bottom supporting plate is fixedly connected with a bed of the device for circularly circulating, arranged around an outer edge of the lower grinding disc and arranged below the U-shaped guide frame; under the constrained guidance of the U-shaped guide frame and the support of the bottom supporting plate, the bearing roller keeps the attitude thereof in the grinding processing area when leaving the grinding processing area from the exit; the receiving transition channel comprises a circular arc channel, the circular arc channel is arranged around the outer edge of the lower grinding disc and butted against the bottom supporting plate, the circular arc channel gradually sinks from a joint with the bottom supporting plate to an end point of the circular arc channel to ensure that the U-shaped guide frame does not interfere with the bearing roller that gradually gets out of the constrained guidance of the U-shaped guide frame when passing over the end point of the circular arc channel, and a width of the receiving transition channel is matched with the axial length of the bearing roller to restrain an attitude of the bearing roller when rolling in the receiving transition channel to avoid the bearing; roller from being stuck; and the receiving transition channel is butted against the storage channel of the receiving mechanism before the station or butted against the storage channel of the receiving mechanism before the station through a conveying mechanism, and the bearing roller enters the storage channel of the storage bin through the receiving transition channel or through the receiving transition channel and the conveying mechanism in turn;
  • when the receiving mechanism before the station is fully loaded with the bearing rollers, a channel entrance of the transition mechanism before the station is butted against a channel exit of the receiving mechanism before the station, and all the bearing rollers in the receiving mechanism before the station are transferred to the storage channel of the transition mechanism before the station in a rolling manner, and the storage channel of the receiving mechanism before the station is emptied; and a channel exit of the fully loaded transition mechanism before the station is butted against a channel entrance of the empty storage bin in the storage station, and all the bearing rollers in the transition mechanism before the station are loaded into the storage channels of the storage bin in a rolling manner;
  • the feeding apparatus comprises a transition mechanism after the station, a feeding mechanism after the station and a feeding channel;
  • the transition mechanism after the station and the feeding mechanism after the station are both provided with a storage channel consistent with that in the storage bin; and the feeding channel is arranged in an upper space of the back surface of the upper grinding disc and is communicated with the entrance;
  • according to the decision of the controller, a channel entrance of the transition mechanism after the station is butted against a channel exit of the selected storage bin in the storage station, all the bearing rollers in the storage bin are unloaded into the storage channel of the transition mechanism after the station in a rolling manner, and the storage channel of the storage bin is emptied; a channel exit of the fully loaded transition mechanism after the station is butted against a channel entrance of the feeding mechanism after the station, and all the bearing rollers in the transition mechanism after the station are transferred to the storage channel of the feeding mechanism after the station in a rolling manner; and channel exits of a plurality of storage channels of the feeding mechanism after the station are successively butted against the feeding channel or are successively butted against the feeding channel through a feeding transition channel to feed the bearing roller into the entrance through the feeding channel; and
  • the feeding channel is a curved channel, a broken line channel or a curved-broken line combined channel; in the process of entering the entrance via the feeding channel, the bearing rollers from the feeding mechanism after the station roll in the feeding channel under gravities of the bearing rollers along a curved path, a broken line path or a curved-broken line combined path from top to bottom in a single-line queue with axes parallel to each other and rolling surfaces close to rolling surfaces; and a width of the feeding channel is matched with an axial length of the bearing roller to restrain an attitude of the bearing roller when rolling in the feeding channel to avoid the bearing roller from being stuck.

Further, the external circulating device is a device suitable for circularly grinding the rolling surface of the bearing roller equipped with a grinding disc kit, the grinding disc kit comprises a lower grinding disc and an upper grinding disc, a front surface of the lower grinding disc is provided with one group of at least three linear grooves distributed radially in a plane or a conical surface or concave arc grooves distributed radially, a front surface of the upper grinding disc is correspondingly provided with a plane spiral groove or a conical spiral groove or a convex circular arc rotating surface spiral groove, the entrance of the grinding processing area is arranged at one end of the plane spiral groove or the conical spiral groove or the convex circular arc rotating surface spiral groove adjacent to an inner edge of the upper grinding disc and leads to a back surface of the upper grinding disc, and the exit of the grinding processing area is arranged at one end of the corresponding plane spiral groove or the conical spiral groove or the convex circular arc rotating surface spiral groove adjacent to an outer edge of the upper grinding disc; during grinding processing, there are bearing rollers continuously entering the grinding processing area from the entrance and there are bearing rollers continuously leaving the grinding processing area from the exit; the bearing rollers enter the grinding processing area from the entrance and leave the grinding processing area from the exit synchronously with the grinding process; and the bearing roller is the cylindrical roller or the tapered roller;

• • a storage space of the storage bin refers to one or more vertical storage channels arranged in parallel, and the storage channel is a curved channel, a broken line channel or a curved-broken line combined channel; in the process of storing in the storage bin or unloading from the storage bin, the bearing rollers roll in the storage channel under gravities of the bearing rollers along a curved path, a broken line path or a curved-broken line combined path from top to bottom with axes parallel to each other and rolling surfaces close to rolling surfaces; a width of the storage channel is matched with an axial length of the bearing roller to restrain an attitude of the bearing roller when rolling in the storage channel to avoid the bearing roller from being stuck; an upper end of the storage channel is the channel entrance, a lower end of the storage channel is the channel exit and is provided with an exit gate; the bearing rollers are sequentially stored in the storage channels from bottom to top in a single-line queue with axes parallel to each other and rolling surfaces close to rolling surfaces; and the exit gate is in an open state when the bearing roller is unloaded from the storage channel;
  • the storage station is provided with a transfer robot for moving the storage bin;
  • the receiving apparatus is provided with a receiving mechanism;
  • the receiving mechanism comprises a U-shaped guide frame, a bottom supporting plate and a receiving transition channel; the U-shaped guide frame is fixedly connected with the lower grinding disc, a U-shaped opening is opposite to the linear groove or the concave arc groove, and an inner width of the U-shaped guide frame is matched with a diameter of the bearing roller; the bottom supporting plate is fixedly connected with a bed of the device for circularly circulating, arranged around an outer edge of the lower grinding disc and arranged below the U-shaped guide frame; under the constrained guidance of the U-shaped guide frame and the support of the bottom supporting plate, the bearing roller keeps the attitude thereof in the grinding processing area when leaving the grinding processing area from the exit; the receiving transition channel comprises a circular arc channel, the circular arc channel is arranged around the outer edge of the lower grinding disc and butted against the bottom supporting plate, the circular arc channel gradually sinks from a joint with the bottom supporting plate to an end point of the circular arc channel to ensure that the U-shaped guide frame does not interfere with the bearing roller that gradually gets out of the constrained guidance of the U-shaped guide frame when passing over the end point of the circular arc channel, and a width of the receiving transition channel is matched with the axial length of the bearing roller to restrain an attitude of the bearing roller when rolling in the receiving transition channel to avoid the bearing roller from being stuck; and the receiving transition channel is butted against the storage channel of the storage bin or butted against the storage channel of the storage bin through a conveying mechanism, and the bearing roller enters the storage channel of the storage bin through the receiving transition channel or through the receiving transition channel and the conveying mechanism in turn;
  • the transfer robot removes the empty storage bin from the storage station, and makes a channel entrance of the storage bin be butted against the receiving transition channel or the conveying mechanism to receive the bearing roller from the receiving mechanism; and when the storage bin is fully loaded with the bearing rollers, the transfer robot sends the storage bin back to the storage station for temporary storage;

the feeding apparatus is provided with a feeding channel; and the feeding channel is arranged in an upper space of the back surface of the upper grinding disc and is communicated with the entrance;

• • according to the decision of the controller, the transfer robot moves the selected storage bin in the storage station and makes a channel exit of the storage bin be butted against the feeding channel to unload the bearing roller;
  • the feeding channel is a curved channel, a broken line channel or a curved-broken line combined channel; in the process of entering the entrance via the feeding channel, the bearing rollers from the storage bin roll in the feeding channel under gravities of the bearing rollers along a curved path, a broken line path or a curved-broken line combined path from top to bottom in a single-line queue with axes parallel to each other and rolling surfaces close to rolling surfaces; and a width of the feeding channel is matched with an axial length of the bearing roller to restrain an attitude of the bearing roller when rolling in the feeding channel to avoid the bearing roller from being stuck;
  • the receiving apparatus is further provided with a receiving buffer station, the receiving buffer station is provided with a receiving station and a buffering station, the receiving buffer station comprises a first bracket and a first guide rail, the first bracket is used for placing the storage bin, and the first bracket and the storage bin thereon switch between the receiving station and the buffering station along the first guide rail; the transfer robot removes the empty storage bin from the storage station and places the empty storage bin on the first bracket located at the buffering station; the storage bin located at the receiving station moves along the first guide rail to make the channel entrance be butted against the receiving transition channel or the conveying mechanism to receive the bearing rollers from the receiving mechanism; when the storage bin located at the receiving station is fully loaded, the fully loaded storage bin is switched to the buffering station, and the empty storage bin is switched to the receiving station; and the transfer robot sends the fully loaded storage bin located at the buffering station back to the storage station for temporary storage, and removes the empty storage bin from the storage station again and places the empty storage bin on the first bracket located at the buffering station, and the process is repeated constantly; and
  • the feeding apparatus is further provided with a feeding buffer station, the feeding buffer station is provided with a feeding station and a buffering station, the feeding buffer station comprises a second bracket and a second guide rail, the second bracket is used for placing the storage bin, and the second bracket and the storage bin thereon switch between the feeding station and the buffering station along the second guide rail; the transfer robot removes the fully loaded storage bin selected by the controller from the storage station and places the fully loaded storage bin on the second bracket located at the buffering station; the storage bin located at the feeding station moves along the second guide rail to make the channel exit be butted against the feeding channel to unload the bearing rollers; when the storage bin located at the feeding station is emptied, the empty storage bin is switched to the buffering station, and the fully loaded storage bin is switched to the feeding station; and the transfer robot sends the empty storage bin located at the buffering station back to the storage station, and removes the fully loaded storage bin selected by the controller from the storage station again and places the fully loaded storage bin on the second bracket located at the buffering station, and the process is repeated constantly.

Further, the external circulating device is a device suitable for circularly grinding the rolling surface of the bearing roller equipped with a shaft sleeve grinding disc kit, the grinding disc kit comprises a grinding shaft and a grinding sleeve which are horizontally arranged, a peripheral surface of the grinding shaft is provided with one group of at least three grinding shaft grooves distributed in a circumferential array, an inner wall of the grinding sleeve is provided with a cylindrical spiral groove, the entrance of the grinding processing area is arranged at one end of the cylindrical spiral groove and leads to an upper half outer wall of the grinding sleeve, and the exit of the grinding processing area is arranged at the other end of the cylindrical spiral groove; during grinding processing, there are bearing rollers continuously entering the grinding processing area from the entrance and there are bearing rollers continuously leaving the grinding processing area from the exit; the bearing rollers enter the grinding processing area from the entrance and leave the grinding processing area from the exit synchronously with the grinding process; and the bearing roller is the cylindrical roller or the tapered roller or the spherical roller;

• • a storage space of the storage bin is divided into a plurality of storage channels which are parallel to each other, and the storage channels are arranged obliquely relative to a horizontal plane to facilitate the bearing rollers to roll unpowered in the storage channels under gravities of the bearing rollers; a width of the storage channel is matched with an axial length of the bearing roller to restrain an attitude of the bearing roller when rolling in the storage channel to avoid the bearing roller from being stuck; an upper end of the storage channel is the channel entrance, a lower end of the storage channel is the channel exit and is provided with an exit gate; the bearing rollers are sequentially stored in the storage channels from bottom to top in a single-line queue with axes parallel to each other and rolling surfaces close to rolling surfaces; and the exit gate is in an open state when the bearing roller is unloaded from the storage channel;
  • the storage bin is arranged in the storage station in a layering way;
  • the receiving apparatus comprises a receiving channel, a receiving mechanism before the station and a transition mechanism before the station;
  • the receiving mechanism before the station and the transition mechanism before the station are both provided with a storage channel consistent with that in the storage bin;
  • the exit of the grinding processing area is butted against the storage channel of the receiving mechanism before the station through the receiving channel or butted against the storage channel of the receiving mechanism before the station through the receiving channel and a conveying mechanism; and during grinding processing, the bearing rollers leave the exit and enter the storage channel of the receiving mechanism before the station through the receiving channel or through the receiving channel and the conveying mechanism in turn;
  • when the receiving mechanism before the station is fully loaded with the bearing rollers, a channel entrance of the transition mechanism before the station is butted against a channel exit of the receiving mechanism before the station, all the bearing rollers in the receiving mechanism before the station are transferred to the storage channel of the transition mechanism before the station in a rolling manner, and the storage channel of the receiving mechanism before the station is emptied; and a channel exit of the fully loaded transition mechanism before the station is butted against a channel entrance of the empty storage bin in the storage station, and all the bearing rollers in the transition mechanism before the station are loaded into the storage channel of the storage bin in a rolling manner;
  • the feeding apparatus comprises a transition mechanism after the station, a feeding mechanism after the station and a feeding channel;
  • the transition mechanism after the station and feeding mechanism after the station are both provided with a storage channel consistent with that in the storage bin; and the feeding channel is arranged in an upper space of the outer wall of the grinding sleeve and is communicated with the entrance;
  • according to the decision of the controller, a channel entrance of the transition mechanism after the station is butted against a channel exit of the selected storage bin in the storage station, all the bearing rollers in the storage bin are unloaded into the storage channel of the transition mechanism after the station in a rolling manner, and the storage channels of the storage bin is emptied; a channel exit of the fully loaded transition mechanism after the station is butted against a channel entrance of the feeding mechanism after the station, and all the bearing rollers in the transition mechanism after the station are transferred to the storage channel of the feeding mechanism after the station in a rolling manner; and channel exits of a plurality of storage channels of the feeding mechanism after the station are successively butted against the feeding channel or are successively butted against the feeding channel through a feeding transition channel to feed the bearing roller into the entrance through the feeding channel; and
  • the feeding channel is a curved channel, a broken line channel or a curved-broken line combined channel; in the process of entering the entrance via the feeding channel, the bearing rollers from the feeding mechanism after the station roll in the feeding channel under gravities of the bearing rollers along a curved path, a broken line path or a curved-broken line combined path from top to bottom in a single-line queue with axes parallel to each other and rolling surfaces close to rolling surfaces; and a width of the feeding channel is matched with an axial length of the bearing roller to restrain an attitude of the bearing roller when rolling in the feeding channel to avoid the bearing roller from being stuck.

Further, the external circulating device is a device suitable for circularly grinding the rolling surface of the bearing roller equipped with a shaft sleeve grinding disc kit, the grinding disc kit comprises a grinding shaft and a grinding sleeve which are horizontally arranged, a peripheral surface of the grinding shaft is provided with one group of at least three grinding shaft grooves distributed in a circumferential array, an inner wall of the grinding sleeve is provided with a cylindrical spiral groove, the entrance of the grinding processing area is arranged at one end of the cylindrical spiral groove and leads to an upper half outer wall of the grinding sleeve, and the exit of the grinding processing area is arranged at the other end of the cylindrical spiral groove; during grinding processing, there are bearing rollers continuously entering the grinding processing area from the entrance and there are bearing rollers continuously leaving the grinding processing area from the exit; and the bearing rollers enter the grinding processing area from the entrance and leave the grinding processing area from the exit synchronously with the grinding process; and the bearing roller is the cylindrical roller or the tapered roller or the spherical roller;

• • a storage space of the storage bin refers to one or more vertical storage channels arranged in parallel, and the storage channel is a curved channel, a broken line channel or a curved-broken line combined channel; in the process of storing in the storage bin or unloading from the storage bin, the bearing rollers roll in the storage channel under gravities of the bearing rollers along a curved path, a broken line path or a curved-broken line combined path from top to bottom with axes parallel to each other and rolling surfaces close to rolling surfaces; a width of the storage channel is matched with an axial length of the bearing roller to restrain an attitude of the bearing roller when rolling in the storage channel to avoid the bearing roller from being stuck; an upper end of the storage channel is the channel entrance, a lower end of the storage channel is the channel exit and is provided with an exit gate; the bearing rollers are sequentially stored in the storage channels from bottom to top in a single-line queue with axes parallel to each other and rolling surfaces close to rolling surfaces; and the exit gate is in an open state when the bearing roller is unloaded from the storage channel;
  • the storage station is provided with a transfer robot for moving the storage bin;
  • the receiving apparatus is provided with a receiving channel;
  • the exit of the grinding processing area is butted against the storage channels of the storage bin through the receiving channel or butted against the storage channels of the storage bin through the receiving channel and a conveying mechanism; and during grinding processing, the bearing rollers leave the exit and enter the storage channels of the storage bin through the receiving channel or enter the storage channels of the storage bin through the receiving channel and the conveying mechanism in turn;
  • the transfer robot removes the empty storage bin from the storage station, and makes a channel entrance of the storage bin be butted against the receiving channel or the conveying mechanism to receive the bearing roller from the receiving channel; and when the storage bin is fully loaded with the bearing rollers, the transfer robot sends the storage bin back to the storage station for temporary storage;
  • the feeding apparatus is provided with a feeding channel; and the feeding channel is arranged in an upper space of the outer wall of the grinding sleeve and is communicated with the entrance;
  • according to the decision of the controller, the transfer robot moves the selected storage bin in the storage station and makes a channel exit of the storage bin be butted against the feeding channel to unload the bearing roller; and
  • the feeding channel is a curved channel, a broken line channel or a curved-broken line combined channel; in the process of entering the entrance via the feeding channel, the bearing rollers from the storage bin roll in the feeding channel under gravities of the bearing rollers along a curved path, a broken line path or a curved-broken line combined path from top to bottom in a single-line queue with axes parallel to each other and rolling surfaces close to rolling surfaces; and a width of the feeding channel is matched with an axial length of the bearing roller to restrain an attitude of the bearing roller when rolling in the feeding channel to avoid the bearing roller from being stuck;
  • the receiving apparatus is further provided with a receiving buffer station, the receiving buffer station is provided with a receiving station and a buffering station, the receiving buffer station comprises a first bracket and a first guide rail, the first bracket is used for placing the storage bin, and the first bracket and the storage bin thereon switch between the receiving station and the buffering station along the first guide rail; the transfer robot removes the empty storage bin from the storage station and places the empty storage bin on the first bracket located at the buffering station; the storage bin located at the receiving station moves along the first guide rail to make the channel entrance be butted against the receiving channel or the conveying mechanism to receive the bearing rollers from the receiving channel; when the storage bin located at the receiving station is fully loaded, the fully loaded storage bin is switched to the buffering station, and the empty storage bin is switched to the receiving station; and the transfer robot sends the fully loaded storage bin located at the buffering station back to the storage station for temporary storage, and removes the empty storage bin from the storage station again and places the empty storage bin on the first bracket located at the buffering station, and the process is repeated constantly; and
  • the feeding apparatus is further provided with a feeding buffer station, the feeding buffer station is provided with a feeding station and a buffering station, the feeding buffer station comprises a second bracket and a second guide rail, the second bracket is used for placing the storage bin, and the second bracket and the storage bin thereon switch between the feeding station and the buffering station along the second guide rail; the transfer robot removes the fully loaded storage bin selected by the controller from the storage station and places the fully loaded storage bin on the second bracket located at the buffering station; the storage bin located at the feeding station moves along the second guide rail to make the channel exit be butted against the feeding channel to unload the bearing rollers; when the storage bin located at the feeding station is emptied, the empty storage bin is switched to the buffering station, and the fully loaded storage bin is switched to the feeding station; and the transfer robot sends the empty storage bin located at the buffering station back to the storage station, and removes the fully loaded storage bin selected by the controller from the storage station again and places the fully loaded storage bin on the second bracket located at the buffering station, and the process is repeated constantly.

Further, the external circulating device is a device suitable for circularly grinding the rolling surface of the bearing roller equipped with a shaft sleeve grinding disc kit, the grinding disc kit comprises a grinding shaft and a grinding sleeve which are horizontally arranged, a peripheral surface of the grinding shaft is provided with one group of at least three grinding shaft grooves distributed in a circumferential array, an inner wall of the grinding sleeve is provided with one group of multiple coaxial circular grooves with equal diameters, and each circular groove is correspondingly provided with one through port for the bearing roller to enter or leave the grinding processing area, the through port leads to an upper half outer wall of the grinding sleeve, and the through port is both an entrance for the bearing roller to enter the grinding processing area and an exit for the bearing roller to leave the grinding processing area; the bearing roller enters the grinding processing area from the through port or leaves the grinding processing area from the through port in time sharing with the grinding process, and the grinding processing process is suspended when the bearing roller enters or leaves the grinding processing area; and the bearing roller is the cylindrical roller or the tapered roller or the spherical roller;

• • a storage space of the storage bin is divided into a plurality of storage channels which are parallel to each other, and the storage channels are arranged obliquely relative to a horizontal plane to facilitate the bearing rollers to roll unpowered in the storage channels under gravities of the bearing rollers; a width of the storage channel is matched with an axial length of the bearing roller to restrain an attitude of the bearing roller when rolling in the storage channel to avoid the bearing roller from being stuck; an upper end of the storage channel is the channel entrance, a lower end of the storage channel is the channel exit and is provided with an exit gate; the bearing rollers are sequentially stored in the storage channels from bottom to top in a single-line queue with axes parallel to each other and rolling surfaces close to rolling surfaces; and the exit gate is in an open state when the bearing roller is unloaded from the storage channel;
  • the storage bin is arranged in the storage station in a layering way;
  • the receiving apparatus comprises an unloading robot, a receiving mechanism before the station and a transition mechanism before the station;
  • the receiving mechanism before the station and the transition mechanism before the station are both provided with a storage channel consistent with that in the storage bin;
  • the feeding apparatus comprises a transition mechanism after the station, a feeding mechanism after the station and a feeding robot;
  • the transition mechanism after the station and feeding mechanism after the station are both provided with a storage channel consistent with that in the storage bin; and
  • the feeding robot and the unloading robot are both provided with one group of finger grippers arranged in parallel, and a tail end of the finger gripper is provided with a sucking disc for adsorbing the bearing roller, and the sucking disc is a vacuum sucking disc or an electromagnetic sucking disc;
  • every time the bearing roller in the grinding processing area completes one round of grinding processing, unloading and feeding work is carried out once; the grinding shaft is rotated until one linear groove faces the through port, the finger grippers of the unloading robot are inserted into each through port respectively to suck and take out one bearing roller located in the linear groove from each through port in parallel, and then place the bearing rollers in each storage channel of the receiving mechanism before the station or in the conveying mechanism respectively, and the bearing rollers placed in the conveying mechanism enter each storage channel of the receiving mechanism before the station through the conveying mechanism; the finger grippers of the feeding robot suck and take out one bearing roller from each storage channel of the feeding mechanism after the station in parallel, and then place the bearing rollers in the linear grooves through each through port according to the attitude requirements of the grinding processing area on the bearing rollers, and then the finger grippers are withdrawn from the through ports; the grinding shaft is continuously rotated until next linear groove faces the through port, and the above operations are repeated until all the bearing rollers finishing last round of grinding processing are unloaded from the grinding processing area and loaded into the subsequent bearing rollers, and the grinding processing process is continued; and in each grinding process, an average material removal amount of the bearing roller in a diameter direction is controlled within 0.5 micron;
  • when the receiving mechanism before the station is fully loaded with the bearing rollers, a channel entrance of the transition mechanism before the station is butted against a channel exit of the receiving mechanism before the station, all the bearing rollers in the receiving mechanism before the station are transferred to the storage channel of the transition mechanism before the station in a rolling manner, and the storage channel of the receiving mechanism before the station is emptied; and a channel exit of the fully loaded transition mechanism before the station is butted against a channel entrance of the empty storage bin in the storage station, and all the bearing rollers in the transition mechanism before the station are loaded into the storage channel of the storage bin in a rolling manner; and
  • according to the decision of the controller, a channel entrance of the transition mechanism after the station is butted against a channel exit of the selected storage bin in the storage station, all the bearing rollers in the storage bin are unloaded into the storage channel of the transition mechanism after the station in a rolling manner, and the storage channels of the storage bin is emptied; a channel exit of the fully loaded transition mechanism after the station is butted against a channel entrance of the feeding mechanism after the station, and all the bearing rollers in the transition mechanism after the station are transferred to the storage channel of the feeding mechanism after the station in a rolling manner.

Meanwhile, the present invention further provides another external circulating device for circularly grinding a rolling surface of a bearing roller, comprising a receiving mechanism, a lifting mechanism and a feeding channel;

• • the receiving mechanism is used for feeding the bearing rollers leaving from the exit of the grinding processing area into the lifting mechanism in a manner of queue advancing and attitude control to avoid the bearing rollers from collision injury due to mutual collision;
  • the lifting mechanism is used for lifting the bearing roller upwards to be butted against the feeding channel in a manner of single-isolation and single-line queue and attitude control or butted against the feeding channel through a conveying mechanism, and the bearing roller enters the feeding channel through the lifting mechanism or enters the feeding channel through the lifting mechanism and the conveying mechanism in turn;
  • the feeding channel is a curved channel, a broken line channel or a curved-broken line combined channel, in the process of entering the entrance via the feeding channel, the bearing rollers from the lifting mechanism or the conveying mechanism roll in the feeding channel under gravities of the bearing rollers along a curved path, a broken line path or a curved-broken line combined path from top to bottom in a single-line queue with axes parallel to each other and rolling surfaces close to rolling surfaces; and a width of the feeding channel is matched with an axial length of the bearing roller to restrain an attitude of the bearing roller when rolling in the feeding channel to avoid the bearing roller from being stuck; and
  • a process that all the bearing rollers enter the grinding processing area from the entrance, undergo grinding in the grinding processing area and leave the grinding processing area from the exit is one grinding cycle; and with the increase of the grinding cycle, a material selective removal effect between the bearing rollers in the grinding processing area is gradually extended to the bearing rollers in the whole batch, and size consistency of the bearing rollers is continuously improved until a specified technical index is achieved.

Further, the external circulating device is a device suitable for circularly grinding the rolling surface of the bearing roller equipped with a grinding disc kit, the grinding disc kit comprises a lower grinding disc and an upper grinding disc, a front surface of the lower grinding disc is provided with one group of at least three linear grooves distributed radially in a plane or a conical surface or concave arc grooves distributed radially, a front surface of the upper grinding disc is correspondingly provided with a plane spiral groove or a conical spiral groove or a convex circular arc rotating surface spiral groove, the entrance of the grinding processing area is arranged at one end of the plane spiral groove or the conical spiral groove or the convex circular arc rotating surface spiral groove adjacent to an inner edge of the upper grinding disc and leads to a back surface of the upper grinding disc, and the exit of the grinding processing area is arranged at one end of the corresponding plane spiral groove or the conical spiral groove or the convex circular arc rotating surface spiral groove adjacent to an outer edge of the upper grinding disc; during grinding processing, there are bearing rollers continuously entering the grinding processing area from the entrance and there are bearing rollers continuously leaving the grinding processing area from the exit; the bearing rollers enter the grinding processing area from the entrance and leave the grinding processing area from the exit synchronously with the grinding process; and the bearing roller is the cylindrical roller or the tapered roller;

• • the receiving mechanism comprises a U-shaped guide frame, a bottom supporting plate and a receiving transition channel; the U-shaped guide frame is fixedly connected with the lower grinding disc, a U-shaped opening is opposite to the linear groove or the concave arc groove, and an inner width of the U-shaped guide frame is matched with a diameter of the bearing roller; the bottom supporting plate is fixedly connected with a bed of the device for circularly circulating, arranged around an outer edge of the lower grinding disc and arranged below the U-shaped guide frame; under the constrained guidance of the U-shaped guide frame and the support of the bottom supporting plate, the bearing roller keeps the attitude thereof in the grinding processing area when leaving the grinding processing area from the exit; the receiving transition channel comprises a circular arc channel, the circular arc channel is arranged around the outer edge of the lower grinding disc and butted against the bottom supporting plate, the circular arc channel gradually sinks from a joint with the bottom supporting plate to an end point of the circular arc channel to ensure that the U-shaped guide frame does not interfere with the bearing roller that gradually gets out of the constrained guidance of the U-shaped guide frame when passing over the end point of the circular arc channel, and a width of the receiving transition channel is matched with the axial length of the bearing roller to restrain an attitude of the bearing roller when rolling in the receiving transition channel to avoid the bearing roller from being stuck; and the receiving transition channel is butted against the lifting mechanism or butted against the lifting mechanism through a conveying mechanism, and the bearing roller enters the lifting mechanism through the receiving transition channel or enters the lifting mechanism through the receiving transition channel and the conveying mechanism in turn; and
  • the feeding channel is arranged in an upper space of the back surface of the upper grinding disc and is communicated with the entrance.

Further, the external circulating device is a device suitable for circularly grinding the rolling surface of the bearing roller equipped with a shaft sleeve grinding disc kit, the grinding disc kit comprises a grinding shaft and a grinding sleeve which are horizontally arranged, a peripheral surface of the grinding shaft is provided with one group of at least three grinding shaft grooves distributed in a circumferential array, an inner wall of the grinding sleeve is provided with a cylindrical spiral groove, the entrance of the grinding processing area is arranged at one end of the cylindrical spiral groove and leads to an upper half outer wall of the grinding sleeve, and the exit of the grinding processing area is arranged at the other end of the cylindrical spiral groove; during grinding processing, there are bearing rollers continuously entering the grinding processing area from the entrance and there are bearing rollers continuously leaving the grinding processing area from the exit; and the bearing rollers enter the grinding processing area from the entrance and leave the grinding processing area from the exit synchronously with the grinding process; and the bearing roller is the cylindrical roller or the tapered roller or the spherical roller;

• • the receiving mechanism is provided with a receiving channel;
  • the exit of the grinding processing area is butted against the lifting mechanism through the receiving channel or butted against the lifting mechanism through the receiving channel and a conveying mechanism; and during grinding processing, the bearing roller leaves the exit and enters the lifting mechanism through the receiving channel or enters the lifting mechanism through the receiving channel and the conveying mechanism in turn; and
  • the feeding channel is arranged in an upper space of the outer wall of the grinding sleeve and is communicated with the entrance.

Compared with the prior art, the present invention has the beneficial effects as follows:

On one hand, in the two external circulating devices for circularly grinding the rolling surface of the bearing roller proposed by the embodiments of the present invention, the bearing rollers are always in a state of orderly position and attitude control, so that the surface of the bearing roller can be effectively prevented from non-negligible collision injury in the external circulating process. On the other hand, in the first external circulating device for circularly grinding the rolling surface of the bearing roller proposed by the embodiments of the present invention, in the process of the bearing roller entering the entrance from the exit via the external circulating device, the first-in-first-out and fixed feeding sequence is broken according to certain rules, which is beneficial to overcoming the disadvantage that the bearing rollers in the bearing roller queue that are far apart cannot be compared with each other in the grinding processing area, thus improving the size consistency and convergence efficiency of the bearing roller.

DESCRIPTION OF THE DRAWINGS

FIG. 1 is a schematic flow diagram of a cylindrical roller in an external circulating device disclosed in patent literature CN113524018A;

FIG. 2 is a schematic flow diagram of a tapered roller in an external circulating device disclosed in patent literature CN113601277A;

FIG. 3 is a schematic flow diagram of a spherical roller in an external circulating device disclosed in patent literature CN113524014A;

FIG. 4 is a schematic flow diagram of a cylindrical roller in an external circulating device disclosed in patent literature CN108908094A;

FIG. 5 is a schematic flow diagram of a circular arc convex cylindrical roller in an external circulating device disclosed in patent literature CN108890516A;

FIG. 6 is a schematic flow diagram of a tapered roller in an external circulating device disclosed in patent literature CN108723979A;

FIG. 7 is a schematic flow diagram of a circular arc convex tapered roller in an external circulating device disclosed in patent literature CN108673331A;

FIG. 8 is a schematic diagram of an entrance and an exit of a grinding processing area when a grinding tool kit comprises a grinding shaft and a grinding sleeve, and an inner wall of the grinding sleeve is provided with one group of multiple coaxial circular grooves with equal diameters;

FIG. 9 is a schematic structural diagram of a cylindrical roller;

FIG. 10 is a schematic structural diagram of a tapered roller;

FIG. 11 is a schematic structural diagram of a spherical roller;

FIG. 12 is a schematic structural diagram of a rolling needle;

FIG. 13 is a schematic diagram of an entrance and an exit of a grinding processing area when a grinding disc kit comprises upper and lower grinding discs;

FIG. 14 is a schematic diagram of a storage bin when a storage channel is horizontally inclined;

FIG. 15 is a first operation diagram of a storage station, a receiving apparatus and a feeding device when a storage channel of the storage bin is horizontally inclined;

FIG. 16 is a schematic diagram of a receiving mechanism;

FIG. 17 is a schematic diagram showing that a feeding channel is arranged in an upper space of a back surface of the upper grinding disc and is communicated with the entrance;

FIG. 18 is a schematic diagram of a storage bin when a storage channel is vertically inclined;

FIG. 19 is a schematic diagram of the storage station when the storage channel of the storage bin is vertically inclined;

FIG. 20 is a schematic diagram of a receiving buffer station;

FIG. 21 is a schematic diagram of a feeding buffer station;

FIG. 22 is a schematic diagram of the entrance and the exit of the grinding processing area when the grinding tool kit comprises a grinding shaft and a grinding sleeve, and an inner wall of the grinding sleeve is provided with a cylindrical spiral groove;

FIG. 23 is schematic diagram of the spherical roller entering a conveying belt from the exit through a receiving channel;

FIG. 24 is schematic diagram of the cylindrical roller entering the conveying belt from the exit through the receiving channel;

FIG. 25 is a schematic diagram showing that a feeding channel is arranged in an upper space of an outer wall of the grinding sleeve and is communicated with the entrance;

FIG. 26 is a schematic diagram of an unloading robot taking out the tapered roller from the exit and placing the tapered roller on the conveying belt; and

FIG. 27 is a second operation diagram of the storage station, the receiving apparatus and the feeding device when the storage channel of the storage bin is horizontally inclined.

In the drawings:

• • 11—cylindrical roller; 12—tapered roller; 13—spherical roller; 14—axis of bearing roller; 15—rolling surface; and 21—linear groove;
  • 22—plane spiral groove; 23—cylindrical spiral groove; and 24—circular groove;
  • 31—lower grinding disc; 32—upper grinding disc; and 33—grinding sleeve;
  • 41—entrance; 42—exit; 43—collection unit; 44—transmission subsystem; 45—sorting unit; 46—feeding unit; and 47—feeding channel;
  • 5—external circulating device;
  • 61—storage bin; 62—exit gate; 63—storage channel; and 64—transfer robot;
  • 71—U-shaped guide frame; 72—bottom supporting plate; 73—receiving channel; 74—conveying belt; 75—receiving transition channel; 76—circular arc channel; 78—receiving mechanism before the station; and 79—transition mechanism before the station;
  • 81—transition mechanism after the station; 82—feeding mechanism after the station; 83—feeding channel; and 84—feeding transition channel; and
  • 91—first bracket; 91′—second bracket; 92—first guide rail; 92′—second guide rail; 93—finger gripper; and 94—sucking disc.

DETAILED DESCRIPTION OF PREFERRED EMBODIMENTS

The present invention will be further described hereinafter in detail with reference to the drawings and embodiments. The embodiments described below by reference to the accompanying drawings are exemplary and are intended only to explain the present invention and are not to be construed as limiting the present invention. In addition, sizes, materials, shapes and relative arrangements of the constituent parts described in the following embodiments are not intended to limit the scope of the present invention to these specific ones unless otherwise specified.

A bearing roller in the present invention particularly refers to a processed bearing roller, and a grinding processing area in the present invention refers to an area where the bearing roller plays a grinding role. During grinding processing, the bearing roller enters the grinding processing area from an entrance 41 of the grinding processing area and leaves the grinding processing area from an exit 42 of the grinding processing area. The bearing roller is a cylindrical roller 11, or a tapered roller 12, or a spherical roller 13. The cylindrical roller 11 comprises a circular arc convex cylindrical roller and a rolling needle. The tapered roller 12 comprises a circular arc convex tapered roller. The spherical roller 13 comprises a symmetric spherical roller without a spherical base surface, a symmetric spherical roller with a spherical base surface and an asymmetric spherical roller. The rolling needle is classified as a cylindrical roller 11 in the present invention. FIG. 9 shows a structural schematic diagram of the cylindrical roller 11, FIG. 10 shows a structural schematic diagram of the tapered roller 12, FIG. 11 shows a structural schematic diagram of the spherical roller 13 without a spherical base surface, and FIG. 12 shows a structural schematic diagram of the rolling needle. In FIGS. 9, 10, 11 and 12, reference numeral 14 refers to an axis of the bearing roller, and reference numeral 15 refers to a rolling surface of the bearing roller.

A conveying mechanism according to the present invention is used for conveying the bearing rollers from one place to another place in a manner of single-line queue and attitude control, and the conveying mechanism is a conveying mechanism in the prior art such as a flat belt conveying mechanism and a double-circle belt conveying mechanism, or a conveying mechanism which may be developed in the future and may be used for the purposes provided by the present invention, and a structure of the conveying mechanism is not specifically limited.

A lifting mechanism according to the present invention is used for lifting the bearing rollers upwards from a lower position in a manner of single-isolation and single-line queue and attitude control, and the lifting mechanism is a lifting mechanism in the prior art such as a push plate lifting mechanism and a chain plate lifting mechanism, or a lifting mechanism which may be developed in the future and may be used for the purposes described by the present invention, and a structure of the lifting mechanism is not specifically limited.

Embodiment 1: An External Circulating Device for Circularly Grinding a Rolling Surface of a Bearing Roller

The external circulating device 5 is a device suitable for circularly grinding the rolling surface of the bearing roller equipped with a grinding disc kit, the grinding disc kit comprises a lower grinding disc 31 and an upper grinding disc 32, a front surface of the lower grinding disc 31 is provided with one group of at least three linear grooves 21 distributed radially in a plane or a conical surface or concave arc grooves distributed radially, a front surface of the upper grinding disc 32 is correspondingly provided with a plane spiral groove or a conical spiral groove or a convex circular arc rotating surface spiral groove, the entrance 41 of the grinding processing area is arranged at one end of the plane spiral groove or the conical spiral groove or the convex circular arc rotating surface spiral groove adjacent to an inner edge of the upper grinding disc 32 and leads to a back surface of the upper grinding disc 32, and the exit 42 of the grinding processing area is arranged at one end of the corresponding plane spiral groove or the conical spiral groove or the convex circular arc rotating surface spiral groove adjacent to an outer edge of the upper grinding disc 32. During grinding processing, there are bearing rollers continuously entering the grinding processing area from the entrance 41 and there are bearing rollers continuously leaving the grinding processing area from the exit 42. The bearing rollers enter the grinding processing area from the entrance and leave the grinding processing area from the exit synchronously with the grinding process. The bearing roller is the cylindrical roller 11 or the tapered roller 12. FIG. 13 is a structural schematic diagram of the entrance and the exit of the grinding processing area when the front surface of the lower grinding disc 31 of the grinding disc kit is provided with the linear grooves 21 radially distributed in a plane and the front surface of the upper grinding disc 32 is provided with the plane spiral groove 22.

The external circulating device 5 comprises a receiving apparatus, a feeding apparatus, a storage station, a plurality of storage bins 61 and a controller.

The storage station is used for storing the storage bin 61. The storage bin 61 is used for temporarily storing the bearing roller, and the bearing rollers are sequentially stored in the storage channels 63 of the storage bin 61 in a single-line queue with axes parallel to each other and rolling surfaces 15 close to rolling surfaces 15 to reduce the mutual collision between the bearing rollers and avoid collision injury. The storage channels 63 are gradually transited from a channel entrance to a channel exit from top to bottom to facilitate the bearing rollers to roll unpowered in the storage channels 63 under gravities of the bearing rollers. The storage bin 61 is a hardware foundation for carrying out partitioning adjustment on sequences and positions of the bearing rollers in the bearing roller queue without physical contact between the bearing rollers loaded in different storage bins 61, and the bearing roller queue is a closed-loop queue comprising all bearing rollers in the grinding processing area and the external circulating device 5.

As shown in FIG. 14, a storage space of the storage bin 61 is divided into a plurality of storage channels 63 which are parallel to each other, and the storage channels 63 are arranged obliquely relative to a horizontal plane to facilitate the bearing rollers to roll unpowered in the storage channels 63 under gravities of the bearing rollers. A width of the storage channel 63 is matched with an axial length of the bearing roller to restrain an attitude of the bearing roller when rolling in the storage channel 63 to avoid the bearing roller from being stuck. An upper end of the storage channel 63 is the channel entrance, and a lower end of the storage channel 63 is the channel exit and is provided with an exit gate 62. The bearing rollers are sequentially stored in the storage channels 63 in a single-line queue with axes parallel to each other and rolling surfaces 15 close to rolling surfaces 15. The exit gate 62 is in an open state when the bearing roller is unloaded from the storage channel 63.

As shown in FIG. 15, the storage bin 61 is arranged in the storage station in a layering way.

The receiving apparatus is used for sequentially loading the bearing rollers leaving from the exit 42 into an empty storage bin 61 in a manner of queue advancing and attitude control to avoid the bearing rollers from collision injury due to mutual collision.

The receiving apparatus comprises a receiving mechanism, a receiving mechanism before the station 78 and a transition mechanism before the station 79.

The receiving mechanism before the station 78 and the transition mechanism before the station 79 are both provided with a storage channel 63 consistent with that in the storage bin 61.

The receiving mechanism comprises a U-shaped guide frame 71, a bottom supporting plate 72 and a receiving transition channel 75. The U-shaped guide frame 71 is fixedly connected with the lower grinding disc 31, a U-shaped opening is opposite to the linear groove 21 or the concave arc groove, and an inner width of the U-shaped guide frame 71 is matched with a diameter of the bearing roller. The U-shaped guide frame 71 replaces the linear groove 21 or the concave arc groove to apply constrained guidance on the bearing roller outside the lower grinding disc 31. The bottom supporting plate 72 is fixedly connected with a bed of the device for circularly circulating, arranged around an outer edge of the lower grinding disc 31 and arranged below the U-shaped guide frame 71. The supporting plate 72 replaces the linear groove 21 or the concave arc groove to apply constrained guidance on the bearing roller outside the lower grinding disc 31. Under the constrained guidance of the U-shaped guide frame 71 and the support of the bottom supporting plate 72, the bearing roller keeps the attitude thereof in the grinding processing area when leaving the grinding processing area from the exit 42. The receiving transition channel 75 comprises a circular arc channel 76, and the circular arc channel 76 is arranged around the outer edge of the lower grinding disc 31 and butted against the bottom supporting plate 72. The circular arc channel 76 gradually sinks from a joint with the bottom supporting plate 72 to an end point of the circular arc channel 76 to ensure that the U-shaped guide frame 71 does not interfere with the bearing roller that gradually gets out of the constrained guidance of the U-shaped guide frame 71 when passing over the end point of the circular arc channel 76. A width of the receiving transition channel 75 is matched with the axial length of the bearing roller to restrain an attitude of the bearing roller when rolling in the receiving transition channel 75 to avoid the bearing roller from being stuck. The receiving transition channel 75 is butted against the storage channel 63 of the receiving mechanism before the station 78 or butted against the storage channel 63 of the receiving mechanism before the station 78 through a conveying mechanism, and the bearing roller enters the storage channel 63 of the receiving mechanism before the station 78 through the receiving transition channel 78 through the receiving transition channel 75 or enters the storage channel 63 of the receiving mechanism before the station 78 through the receiving transition channel 75 and the conveying mechanism in turn. FIG. 16 is a schematic diagram of the receiving mechanism, and the front surface of the lower grinding disc shown in the figure is provided with the linear grooves 21 distributed radially in a plane. The figure also shows a butting relationship between the receiving transition channel 75 and the conveying belt 74, and the bearing roller enters the conveying belt 74 through the receiving transition channel 75. It is not the invention point of this embodiment about how the bearing roller enters the storage channel 63 of the receiving mechanism before the station 78. According to the specific application scenario, a person skilled in the art can design a variety of technical solutions based on prior art as well as the simple combination of the prior art, and these technical solutions and their implementation structures are not limited in this embodiment.

As shown in FIG. 15, the entrances of the plurality of storage channels of the receiving mechanism before the station 78 are successively butted against the receiving transition channel 75 or the conveying mechanism to receive the bearing roller from the receiving mechanism (the receiving mechanism before the station in the figure is receiving the tapered roller 12 from the receiving mechanism). When the receiving mechanism before the station 78 is fully loaded with the bearing rollers, a channel entrance of the transition mechanism before the station 79 is butted against a channel exit of the receiving mechanism before the station 78, and all the bearing rollers in the receiving mechanism before the station 78 are transferred to the storage channel 63 of the transition mechanism before the station 79 in a rolling manner, and the storage channel 63 of the receiving mechanism before the station 78 is emptied. A channel exit of the fully loaded transition mechanism before the station 79 is butted against a channel entrance of the empty storage bin 61 in the storage station, and all the bearing rollers in the transition mechanism before the station 79 are loaded into the storage channels 63 of the storage bin 61 in a rolling manner (the transition mechanism before the station 79 in the figure is loading the tapered roller 12 to the storage bin 61).

The feeding apparatus is used for unloading the bearing rollers from the selected storage bin 61 in the storage station according to a decision of the controller, and sequentially loading the bearing rollers into the entrance 41 according to attitude requirements of the grinding processing area on the bearing rollers in a manner of queue advancing and attitude control and avoiding the bearing rollers from collision injury due to mutual collision.

The feeding apparatus comprises a transition mechanism after the station 81, a feeding mechanism after the station 82 and a feeding channel 83.

The transition mechanism after the station 81 and the feeding mechanism after the station 82 are both provided with a storage channel 63 consistent with that in the storage bin 61. The feeding channel 83 is arranged in an upper space of the back surface of the upper grinding disc 32 and is communicated with the entrance 41, as shown in FIG. 17.

According to the decision of the controller, as shown in FIG. 15, a channel exit of the transition mechanism after the station 81 is butted against a channel entrance of the selected storage bin 61 in the storage station, all the bearing rollers in the storage bin 61 are loaded into the storage channel 63 of the transition mechanism after the station 81 in a rolling manner (the transition mechanism after the station 81 in the figure is unloading the tapered roller 12 from the storage bin 61), and the storage channel 63 of the storage bin 61 is emptied. A channel exit of the fully loaded transition mechanism after the station 81 is butted against a channel entrance of the feeding mechanism after the station 82, and all the bearing rollers in the transition mechanism after the station 81 are transferred to the storage channel 63 of the feeding mechanism after the station 82 in a rolling manner. Channel exits of a plurality of storage channels of the feeding mechanism after the station 82 are successively butted against the feeding channel 83 or are successively butted against the feeding channel 83 through a feeding transition channel 84 to feed the bearing roller into the entrance 41 through the feeding channel 83 (the feeding mechanism after the station 82 in the figure is successively butted against the feeding channel 83 through the feeding transition channel 84).

The feeding channel 83 is a curved channel, a broken line channel or a curved-broken line combined channel. As shown in FIG. 17, in the process of entering the entrance 41 via the feeding channel 83, the bearing rollers from the feeding mechanism after the station 82 roll in the feeding channel 83 under gravities of the bearing rollers along a curved path, a broken line path or a curved-broken line combined path from top to bottom in a single-line queue with axes parallel to each other and rolling surfaces 15 close to rolling surfaces 15. A width of the feeding channel 83 is matched with an axial length of the bearing roller to restrain an attitude of the bearing roller when rolling in the feeding channel 83 to avoid the bearing roller from being stuck. A length of the feeding channel 83 is sufficient to buffer dozens of bearing rollers in the feeding channel 83.

The bearing rollers in the same storage channel 63 enter the storage channel 63 from the channel entrance and leave the storage channel 63 from the channel exit in an order of first-in first-out and last-in last-out.

The controller is used for deciding when to unload the bearing rollers from which storage bin 61. The controller is a software foundation for carrying out partitioning adjustment on the sequences and the positions of the bearing rollers in the bearing roller queue without physical contact between the bearing rollers loaded in different storage bins 61.

During grinding processing, the bearing rollers finishing one grinding processing in the grinding processing area leave the grinding processing area from the exit 42, and the bearing rollers leaving the grinding processing area are temporarily stored in the empty storage bin 61 and stored in the storage station, the bearing rollers are unloaded from the selected storage bin 61 in the storage station according to the decision of the controller and sent to the grinding processing area from the entrance 41 to continue grinding processing, and the sequences and positions of the bearing rollers sent to the grinding processing area in the bearing roller queue are updated according to the decision of the controller, thus realizing partitioning and mixed transposition of the bearing rollers without physical contact between the bearing rollers loaded in different storage bins 61.

A process that all the bearing rollers enter the grinding processing area from the entrance 41, undergo grinding in the grinding processing area and leave the grinding processing area from the exit 42 is one grinding cycle.

Sequence and position changes of the bearing rollers leaving the grinding processing area from the exit 42 in the external circulating device 5 in the bearing roller queue change combination of the bearing rollers entering the grinding processing area subsequently, thus extending a material selective removal effect between the bearing rollers in the grinding processing area to the bearing rollers in the whole batch. With the increase of the grinding cycle, size consistency of the bearing rollers is continuously improved until a specified technical index is achieved.

In order to improve the size consistency of the bearing roller, it is necessary to work out a feeding sequence rule for loading the bearing roller into the entrance 41, and plan an unloading sequence of the bearing roller from each storage bin 61 in the grinding process according to the feeding sequence rules. On the one hand, the feeding sequence rule can ensure that grinding cycles experienced by all the bearing rollers are close to each other, and meanwhile, can weaken sequence and position characteristics of the bearing rollers in the bearing roller queue that are compared with each other in the grinding processing area.

The external circulating device 5 is used for deal with the grinding of a large number of bearing rollers with a capacity greater than that of the grinding processing area on one hand; and is used for establishing a logistics channel of the bearing rollers between the exit 42 and the entrance 41 on the other hand; and is used for mixing and transposing the bearing rollers to weaken the sequence and position characteristics of the bearing rollers in the bearing roller queue on yet another aspect.

In the process of the bearing roller entering the entrance 41 from the exit 42 via the external circulating device 5, the first-in-first-out and fixed feeding sequence is broken according to certain rules, which is beneficial to overcoming the disadvantage that the bearing rollers in the bearing roller queue that are far apart cannot be compared with each other in the grinding processing area.

In the flow process of the external circulating device 5, the bearing rollers are temporarily stored in the storage bin 61 in an orderly manner, and then unloaded from the selected storage bin 61 according to a planned time sequence and then loaded into the entry 41 in an orderly manner, which can effectively avoid surface damage caused by the collision between the bearing rollers.

Embodiment 2: An External Circulating Device for Circularly Grinding a Rolling Surface of a Bearing Roller

The main differences between the external circulating device and the external circulating device according to Embodiment 1 are as follows.

A storage space of the storage bin 61 refers to one or more vertical storage channels 63 arranged in parallel, and the storage channel 63 is a curved channel, a broken line channel or a curved-broken line combined channel. The storage space of the storage bin as shown in FIG. 18 is provided with three storage channels 63. In the process of storing in the storage bin 61 or unloading from the storage bin 61, the bearing rollers roll in the storage channel 63 under gravities of the bearing rollers along a curved path, a broken line path or a curved-broken line combined path from top to bottom with axes parallel to each other and rolling surfaces 15 close to rolling surfaces 15. A width of the storage channel 63 is matched with an axial length of the bearing roller to restrain an attitude of the bearing roller when rolling in the storage channel 63 to avoid the bearing roller from being stuck. An upper end of the storage channel 63 is the channel entrance, and a lower end of the storage channel 63 is the channel exit and is provided with an exit gate 62. The bearing rollers are sequentially stored in the storage channels 63 from bottom to top in a single-line queue with axes parallel to each other and rolling surfaces 15 close to rolling surfaces 15. The exit gate 62 is in an open state when the bearing roller is unloaded from the storage channel 63.

As shown in FIG. 19, the storage station is provided with a transfer robot 64, and the transfer robot 64 is used for moving the storage bin 61.

The receiving apparatus is provided with the receiving mechanism as Embodiment 1.

The receiving transition channel 75 is butted against the storage channel 63 of the storage bin 61 or butted against the storage channel 63 of the storage bin 61 through a conveying mechanism, and the bearing roller enters the storage channel 63 of the storage bin 61 through the receiving transition channel 75 or enters the storage channel 63 of the storage bin 61 through the receiving transition channel 75 and the conveying mechanism in turn.

The transfer robot 64 removes the empty storage bin 61 from the storage station, and makes a channel entrance of the storage bin 61 be butted against the receiving transition channel 75 or the conveying mechanism to receive the bearing roller from the receiving mechanism. When the storage bin 61 is fully loaded with the bearing rollers, the transfer robot 64 sends the storage bin 61 back to the storage station for temporary storage.

The feeding device is provided with the feeding channel 83 according to Embodiment 1.

According to the decision of the controller, the transfer robot 64 moves the selected storage bin 61 in the storage station and makes a channel exit of the storage bin 61 be butted against the feeding channel 83 to unload the bearing roller.

As shown in FIG. 20, the receiving apparatus is further provided with a receiving buffer station, the receiving buffer station is provided with a receiving station and a buffering station, the receiving buffer station comprises a first bracket 91 and a first guide rail 92, the first bracket 91 is used for placing the storage bin 61, and the first bracket 91 and the storage bin 61 thereon switch between the receiving station and the buffering station along the first guide rail 92. The transfer robot 64 removes the empty storage bin 61 from the storage station and places the empty storage bin on the first bracket 91 located at the buffering station. The storage bin 61 located at the receiving station moves along the first guide rail 92 to make the channel entrance be butted against the receiving transition channel 75 or the conveying mechanism to receive the bearing rollers from the receiving mechanism. When the storage bin 61 located at the receiving station is fully loaded, the fully loaded storage bin 61 is switched to the buffering station, and the empty storage bin 61 is switched to the receiving station. The transfer robot 64 sends the fully loaded storage bin 61 located at the buffering station back to the storage station for temporary storage, and removes the empty storage bin 61 from the storage station again and places the empty storage bin on the first bracket 91 located at the buffering station, and the process is repeated constantly.

As shown in FIG. 21, the feeding device is further provided with a feeding buffer station, the feeding buffer station is provided with a feeding station and a buffering station, the feeding buffer station comprises a second bracket 91′ and a second guide rail 92′, the second bracket 91′ is used for placing the storage bin 61, and the second bracket 91′ and the storage bin 61 thereon switch between the feeding station and the buffering station along the second guide rail 92′. The transfer robot 64 removes the fully loaded storage bin 61 selected by the controller from the storage station and places the fully loaded storage bin on the second bracket 91′ located at the buffering station. The storage bin 61 located at the feeding station moves along the second guide rail 92′ to make the channel exit be butted against the feeding channel 83 to unload the bearing rollers. When the storage bin 61 located at the feeding station is emptied, the empty storage bin 61 is switched to the buffering station, and the fully loaded storage bin 61 is switched to the feeding station. The transfer robot 64 sends the empty storage bin 61 located at the buffering station back to the storage station, and removes the fully loaded storage bin 61 selected by the controller from the storage station again and places the fully loaded storage bin on the second bracket 91′ located at the buffering station, and the process is repeated constantly.

Embodiment 3: An External Circulating Device for Circularly Grinding a Rolling Surface of a Bearing Roller

The main differences between the external circulating device and the external circulating device according to Embodiment 1 are as follows.

The external circulating device 5 is a device suitable for circularly grinding the rolling surface of the bearing roller equipped with a shaft sleeve grinding disc kit, the grinding disc kit comprises a grinding shaft and a grinding sleeve 33 which are horizontally arranged, a peripheral surface of the grinding shaft is provided with one group of at least three grinding shaft grooves distributed in a circumferential array, an inner wall of the grinding sleeve 33 is provided with a cylindrical spiral groove 23, the entrance 41 of the grinding processing area is arranged at one end of the cylindrical spiral groove 23 and leads to an upper half outer wall of the grinding sleeve 33, and the exit 42 of the grinding processing area is arranged at the other end of the cylindrical spiral groove 23. During grinding processing, there are bearing rollers continuously entering the grinding processing area from the entrance 41 and there are bearing rollers continuously leaving the grinding processing area from the exit 42. The bearing rollers enter the grinding processing area from the entrance 41 and leave the grinding processing area from the exit 42 synchronously with the grinding process. The bearing roller is the cylindrical roller 11 or the tapered roller 12 or the spherical roller 13. FIG. 22 is a schematic diagram of the entrance and the exit of the grinding processing area when the peripheral surface of the grinding tool kit is provided with one group of linear grooves distributed in a circumferential array and the inner wall of the grinding sleeve is provided with the cylindrical spiral groove.

The receiving apparatus comprises a receiving channel 73 as well as the receiving mechanism before the station 78 and the transition mechanism before the station 79 according to Embodiment 1.

The exit 42 of the grinding processing area is butted against the storage channel 63 of the receiving mechanism before the station 78 through the receiving channel 73 or butted against the storage channel 63 of the receiving mechanism before the station 78 through the receiving channel 73 and a conveying mechanism. During grinding processing, the bearing roller leaves the exit 42 and enters the storage channel 63 of the receiving mechanism before the station 78 through the receiving channel 73 or enters the storage channel 63 of the receiving mechanism before the station 78 through the receiving channel 73 and the conveying mechanism in turn. FIG. 23 and FIG. 24 show a butting relationship between the receiving channel 73 and a conveying belt 74, wherein FIG. 23 shows the spherical roller 13 entering the conveying belt 74 through a receiving channel 73 and FIG. 24 shows the cylindrical roller 11 entering the conveying belt 74 through the receiving channel 73.

The feeding channel 83 is arranged in an upper space of the outer wall of the grinding sleeve 33 and is communicated with the entrance 41, as shown in FIG. 25.

Embodiment 4: An External Circulating Device for Circularly Grinding a Rolling Surface of a Bearing Roller

The main differences between the external circulating device and the external circulating device according to Embodiment 2 are as follows.

The external circulating device 5 is a device suitable for circularly grinding the rolling surface of the bearing roller equipped with a shaft sleeve grinding disc kit, the grinding disc kit comprises a grinding shaft and a grinding sleeve 33 which are horizontally arranged, a peripheral surface of the grinding shaft is provided with one group of at least three grinding shaft grooves distributed in a circumferential array, an inner wall of the grinding sleeve 33 is provided with a cylindrical spiral groove 23, the entrance 41 of the grinding processing area is arranged at one end of the cylindrical spiral groove 23 and leads to an upper half outer wall of the grinding sleeve 33, and the exit 42 of the grinding processing area is arranged at the other end of the cylindrical spiral groove 23. During grinding processing, there are bearing rollers continuously entering the grinding processing area from the entrance 41 and there are bearing rollers continuously leaving the grinding processing area from the exit 42. The bearing rollers enter the grinding processing area from the entrance 41 and leave the grinding processing area from the exit 42 synchronously with the grinding process. The bearing roller is the cylindrical roller 11 or the tapered roller 12 or the spherical roller 13. FIG. 22 is a schematic diagram of the entrance and the exit of the grinding processing area when the peripheral surface of the grinding tool kit is provided with one group of linear grooves distributed in a circumferential array and the inner wall of the grinding sleeve is provided with the cylindrical spiral groove.

The receiving apparatus is provided with the receiving channel 73 as Embodiment 3.

The exit 42 of the grinding processing area is butted against the storage channel 63 of the storage bin 61 through the receiving channel 73 or butted against the storage channel 63 of the storage bin 61 through the receiving channel 73 and a conveying mechanism. During grinding processing, the bearing roller leaves the exit 42 and enters the storage channel 63 of the storage bin 61 through the receiving channel 73 or enters the storage channel 63 of the storage bin 61 through the receiving channel 73 and the conveying mechanism in turn. FIG. 23 shows the spherical roller 13 entering the conveying belt 74 through the receiving channel 73 and FIG. 24 shows the cylindrical roller 11 entering the conveying belt 74 through the receiving channel 73.

The transfer robot 64 removes the empty storage bin 61 from the storage station, and makes a channel entrance of the storage bin 61 be butted against the receiving channel 73 or the conveying mechanism to receive the tapered roller 1 from the receiving channel 73. When the storage bin 61 is fully loaded with the tapered rollers 1, the transfer robot 64 sends the storage bin 61 back to the storage station for temporary storage.

The feeding channel 83 is arranged in an upper space of the outer wall of the grinding sleeve 33 and is communicated with the entrance 41.

Embodiment 5: An External Circulating Device for Circularly Grinding a Rolling Surface of a Bearing Roller

The main differences between the external circulating device and the external circulating device according to Embodiment 3 are as follows.

The external circulating device 5 is a device suitable for circularly grinding the rolling surface of the bearing roller equipped with a shaft sleeve grinding disc kit. As shown in FIG. 8, the grinding disc kit comprises a grinding shaft and a grinding sleeve 33 which are horizontally arranged, a peripheral surface of the grinding shaft is provided with one group of at least three linear grooves 21 distributed in a circumferential array, an inner wall of the grinding sleeve 33 is provided with one group of multiple coaxial circular grooves 24 with equal diameters, and each circular groove 24 is correspondingly provided with one through port for the bearing roller to enter the entrance 41 of the grinding processing area and lead to an upper half outer wall of the grinding sleeve 33, and the entrance 41 is also the 42 exit for the bearing roller to leave the grinding processing area. When the c device for circularly circulating works, firstly, the bearing rollers are loaded into the grinding processing area from the entrance 41, and grinding processing is started after the grinding processing area is full of the bearing rollers. After processing for a period of time, the bearing rollers in the grinding processing area are unloaded from the exit 42 and the subsequent bearing rollers are loaded into the grinding processing area from the entrance 41 to continue grinding processing. The bearing roller enters the grinding processing area from the entrance 41 or leaves the grinding processing area from the exit 42 in time sharing with the grinding process, and the grinding processing process is suspended when the bearing roller enters or leaves the grinding processing area. The bearing roller is the cylindrical roller 11 or the tapered roller 12 or the spherical roller 13.

The receiving apparatus comprises an unloading robot as well as the receiving mechanism before the station 78 and the transition mechanism before the station 79 according to Embodiment 1.

The feeding apparatus comprises a feeding robot as well as the transition mechanism after the station 81 and the feeding mechanism after the station 82 according to Embodiment 1.

The feeding robot and the unloading robot are both provided with one group of finger grippers 93 arranged in parallel, and a tail end of the finger gripper 93 is provided with a sucking disc 94 for adsorbing the bearing roller. As shown in FIG. 26, the sucking disc 94 is a vacuum sucking disc or an electromagnetic sucking disc.

Every time the bearing roller in the grinding processing area completes one round of grinding processing, unloading and feeding work is carried out once. The grinding shaft is rotated until one linear groove 21 faces the exit 42, the finger grippers 93 of the unloading robot are inserted into each exit 42 respectively to suck and take out one bearing roller located in the linear groove 21 from each exit 42 in parallel, and then place the bearing rollers in each storage channel 63 of the receiving mechanism before the station 78 or in the conveying mechanism (as shown in FIG. 26, the unloading robot is placing the tapered roller 12 taken out from the exit 42 on the conveying belt 74) respectively, and the bearing rollers placed on the conveying mechanism enter each storage channel 63 of the receiving mechanism before the station 78 through the conveying mechanism. The finger grippers 93 of the feeding robot suck and take out one bearing roller from each storage channel 63 of the feeding mechanism after the station in parallel, and then place the bearing rollers in the linear grooves 21 through each entrance 41 according to the attitude requirements of the grinding processing area on the bearing rollers, and then the finger grippers 93 are withdrawn from the entrances 41. The grinding shaft is continuously rotated until next linear groove 21 faces the exit 42, and the above operations are repeated until all the bearing rollers finishing last round of grinding processing are unloaded from the grinding processing area and loaded into the subsequent bearing rollers, and the grinding processing process is continued. As shown in FIG. 27, a third storage channel 3 of the receiving mechanism before the station 78 is receiving the tapered roller 12 from the conveying mechanism, and the feeding robot has already taken out two tapered rollers 12 from each storage channel 63 of the feeding mechanism after the station 82, wherein the conveying mechanism is not shown in the figure. In each grinding process, an average material removal amount of the bearing roller in a diameter direction is controlled within 0.5 micron.

Embodiment 6: An External Circulating Device for Circularly Grinding a Rolling Surface of a Bearing Roller

The external circulating device 5 is a device suitable for circularly grinding the rolling surface of the bearing roller equipped with a grinding disc kit, the grinding disc kit comprises a lower grinding disc 31 and an upper grinding disc 32, a front surface of the lower grinding disc 31 is provided with one group of at least three linear grooves 21 distributed radially in a plane or a conical surface or concave arc grooves distributed radially, a front surface of the upper grinding disc 32 is correspondingly provided with a plane spiral groove or a conical spiral groove or a convex circular arc rotating surface spiral groove, the entrance 41 of the grinding processing area is arranged at one end of the plane spiral groove or the conical spiral groove or the convex circular arc rotating surface spiral groove adjacent to an inner edge of the upper grinding disc 32 and leads to a back surface of the upper grinding disc 32, and the exit 42 of the grinding processing area is arranged at one end of the corresponding plane spiral groove or the conical spiral groove or the convex circular arc rotating surface spiral groove adjacent to an outer edge of the upper grinding disc 32. During grinding processing, there are bearing rollers continuously entering the grinding processing area from the entrance 41 and there are bearing rollers continuously leaving the grinding processing area from the exit 42. The bearing rollers enter the grinding processing area from the entrance 41 and leave the grinding processing area from the exit 42 synchronously with the grinding process. The bearing roller is the cylindrical roller 11 or the tapered roller 12. FIG. 13 is a schematic diagram of the entrance and the exit of the grinding processing area when the front surface of the lower grinding disc 31 of the grinding tool kit is provided with the linear grooves 21 distributed radially and the front surface of the upper grinding disc 32 is provided with the plane spiral groove 22.

The external circulating device 5 comprises a receiving mechanism, a lifting mechanism and a feeding channel 83.

The feeding channel 83 is arranged in an upper space of the back surface of the upper grinding disc 32 and is communicated with the entrance 41, as shown in FIG. 17.

The receiving mechanism comprises a U-shaped guide frame 71, a bottom supporting plate 72 and a receiving transition channel 75. The U-shaped guide frame 71 is fixedly connected with the lower grinding disc 31, a U-shaped opening is opposite to the linear groove 21 or the concave arc groove, and an inner width of the U-shaped guide frame 71 is matched with a diameter of the bearing roller. The U-shaped guide frame 71 replaces the linear groove 21 or the concave arc groove to apply constrained guidance on the bearing roller outside the lower grinding disc 31. The bottom supporting plate 72 is fixedly connected with a bed of the device for circularly circulating, arranged around an outer edge of the lower grinding disc 31 and arranged below the U-shaped guide frame 71. The supporting plate 72 replaces the linear groove 21 or the concave arc groove to apply constrained guidance on the bearing roller outside the lower grinding disc 31. Under the constrained guidance of the U-shaped guide frame 71 and the support of the bottom supporting plate 72, the bearing roller keeps the attitude thereof in the grinding processing area when leaving the grinding processing area from the exit 42. The receiving transition channel 75 comprises a circular arc channel 76, and the circular arc channel 76 is arranged around the outer edge of the lower grinding disc 31 and butted against the bottom supporting plate 72. The circular arc channel 76 gradually sinks from a joint with the bottom supporting plate 72 to an end point of the circular arc channel 76 to ensure that the U-shaped guide frame 71 does not interfere with the bearing roller that gradually gets out of the constrained guidance of the U-shaped guide frame 71 when passing over the end point of the circular arc channel 76. A width of the receiving transition channel 75 is matched with the axial length of the bearing roller to restrain an attitude of the bearing roller when rolling in the receiving transition channel 75 to avoid the bearing roller from being stuck. The receiving transition channel 75 is butted against the lifting mechanism or butted against the lifting mechanism through a conveying mechanism, and the bearing roller enters the lifting mechanism through the receiving transition channel 75 or enters the lifting mechanism through the receiving transition channel 75 and the conveying mechanism in turn. FIG. 16 is a schematic diagram of the receiving mechanism, wherein the front surface of the lower grinding disc shown in the figure is provided with the linear grooves 21 distributed radially in a plane. The figure also shows a butting relationship between the receiving transition channel 75 and the conveying belt 74, and the bearing rollers enter the conveying belt 74 through the receiving transition channel 75.

The lifting mechanism is used for lifting the bearing roller upwards to be butted against the feeding channel 83 in a manner of single-isolation and single-line queue and attitude control or butted against the feeding channel 83 through a conveying mechanism, and the bearing roller enters the feeding channel 83 through the lifting mechanism or enters the feeding channel 83 through the lifting mechanism and the conveying mechanism in turn.

The feeding channel 83 is a curved channel, a broken line channel or a curved-broken line combined channel. As shown in FIG. 17, in the process of entering the entrance 41 via the feeding channel 83, the bearing rollers from the lifting mechanism or the conveying mechanism roll in the feeding channel 83 under gravities of the bearing rollers along a curved path, a broken line path or a curved-broken line combined path from top to bottom in a single-line queue with axes parallel to each other and rolling surfaces 15 close to rolling surfaces 15. A width of the feeding channel 83 is matched with an axial length of the bearing roller to restrain an attitude of the bearing roller when rolling in the feeding channel 83 to avoid the bearing roller from being stuck. A length of the feeding channel 83 is sufficient to buffer dozens of bearing rollers in the feeding channel 83.

A process that all the bearing rollers enter the grinding processing area from the entrance 41, undergo grinding in the grinding processing area and leave the grinding processing area from the exit 42 is one grinding cycle. With the increase of the grinding cycle, a material selective removal effect between the bearing rollers in the grinding processing area is gradually extended to the bearing rollers in the whole batch, and size consistency of the bearing rollers is continuously improved until a specified technical index is achieved.

Embodiment 7: An External Circulating Device for Circularly Grinding a Rolling Surface of a Bearing Roller

The main differences between the external circulating device and the external circulating device according to Embodiment 6 are as follows.

The external circulating device 5 is a device suitable for circularly grinding the rolling surface of the bearing roller equipped with a shaft sleeve grinding disc kit, the grinding disc kit comprises a grinding shaft and a grinding sleeve 33 which are horizontally arranged, a peripheral surface of the grinding shaft is provided with one group of at least three grinding shaft grooves distributed in a circumferential array, an inner wall of the grinding sleeve 33 is provided with a cylindrical spiral groove 23, the entrance 41 of the grinding processing area is arranged at one end of the cylindrical spiral groove 23 and leads to an upper half outer wall of the grinding sleeve 33, and the exit 42 of the grinding processing area is arranged at the other end of the cylindrical spiral groove 23. During grinding processing, there are bearing rollers continuously entering the grinding processing area from the entrance 41 and there are bearing rollers continuously leaving the grinding processing area from the exit 42. The bearing rollers enter the grinding processing area from the entrance 41 and leave the grinding processing area from the exit 42 synchronously with the grinding process. The bearing roller is the cylindrical roller 11 or the tapered roller 12 or the spherical roller 13. FIG. 22 is a schematic diagram of the entrance and the exit of the grinding processing area when the peripheral surface of the grinding tool kit is provided with one group of linear grooves distributed in a circumferential array and the inner wall of the grinding sleeve is provided with the cylindrical spiral groove.

The receiving mechanism is provided with a receiving channel 73.

The exit 42 of the grinding processing area is butted against the lifting mechanism through the receiving channel 73 or butted against the lifting mechanism through the receiving channel 73 and a conveying mechanism. During grinding processing, the bearing roller leaves the exit 42 and enters the lifting mechanism through the receiving channel 73 or enters the lifting mechanism through the receiving channel 73 and the conveying mechanism in turn. FIG. 23 and FIG. 24 show a butting relationship between the receiving channel 73 and a conveying belt 74, wherein FIG. 23 shows the spherical roller 13 entering the conveying belt 74 through a receiving channel 73 and FIG. 24 shows the cylindrical roller 11 entering the conveying belt 74 through the receiving channel 73.

The feeding channel 83 is arranged in an upper space of the outer wall of the grinding sleeve 33 and is communicated with the entrance 41, as shown in FIG. 25.