Grinding device for a rubidium-iron-boron permanent magnet material

Abstract

This invention provides a grinding device for neodymium iron boron permanent magnet materials, relating to the field of grinding processing technology. It includes an upper housing; the upper housing is a cylindrical structure, and a lower housing is located below it. By setting the upper and lower housings as a modular structure, two sets of ring liners can be detachably installed between them. A movable ring drives the side plates, and the inner wall of the side plates engages with the locking strips on the outside of the ring liners, enabling rapid positioning, fixing, and disassembly of the ring liners. By replacing ring liners of different thicknesses, the gap between the grinding roller and the ring liners can be flexibly adjusted, thereby achieving the grinding processing of permanent magnet material powders with different particle sizes. This solves the problem that in practical applications, neodymium iron boron permanent magnet materials can only be processed into powders of a single fixed particle size, and the grinding parameters cannot be flexibly adjusted according to the different requirements of subsequent molding and sintering processes to produce powder products of different particle sizes, greatly limiting the applicability of this type of grinding device.

Description

Technical Field

[0001] This invention relates to the field of grinding technology, and in particular to a grinding device for neodymium iron boron permanent magnet materials. Background Technology

[0002] Rubidium iron boron (NdFeB) permanent magnets, currently the best performing permanent magnet materials, are widely used in key fields such as new energy vehicles, wind power generation, consumer electronics, and aerospace. With their high energy product and high coercivity, they have become an indispensable core material in modern high-end equipment manufacturing. Grinding is a crucial process in the production and processing of NdFeB permanent magnets. Its core purpose is to process NdFeB permanent magnet blanks, coarse powder from hydrogen crushing, or recycled waste into micron-sized fine powder that meets the requirements of subsequent forming and sintering through a conical mill. Simultaneously, it controls the particle size distribution and morphology of the powder, reduces particle agglomeration, improves material density and magnetic properties, and ensures that the final NdFeB permanent magnets can meet the performance requirements of various application scenarios.

[0003] For example, application number CN201420519681.8 discloses a grinding device for neodymium iron boron permanent magnet materials, which includes a grinding cylinder, a grinding cover, a drive motor, a drive shaft, and grinding wheels. The grinding cylinder includes a cylindrical cylinder and an inverted conical cylinder; the grinding cover includes a cover plate and an arc-shaped support, and the cover plate has a drive shaft hole in the middle, in which a drive bearing is installed; the grinding wheel is composed of a conical grinding wheel and a cylindrical grinding wheel, and the cross-sectional diameter of the cylindrical grinding wheel is the same as the maximum cross-sectional diameter of the conical grinding wheel; the two ends of the drive shaft are respectively connected to the drive motor and the small diameter surface of the conical grinding wheel. The grinding wheel of this utility model is composed of a conical grinding wheel and a cylindrical grinding wheel, which allows the neodymium iron boron permanent magnet material to be ground sequentially from large to small after entering the grinding cylinder, making the grinding more thorough and resulting in finer and more uniform powder.

[0004] However, there are some shortcomings in the current design of permanent magnet material grinding and processing equipment: First, the processing efficiency of existing grinding equipment is low. Specifically, when using a conical mill to grind neodymium iron boron permanent magnet materials, existing equipment generally relies on the material's own weight to achieve natural material feeding. Although some conical mill equipment has a pressure plate structure to assist in material feeding, the structure design of the pressure plate cannot be adapted to the shape of the conical grinding roller. When the neodymium iron boron permanent magnet material is ground to a certain particle size, the pressure plate cannot continue to apply effective pressure downward to push the material, which hinders the material grinding process and makes it impossible to quickly grind to the ideal particle size required for subsequent processes, seriously affecting the overall processing efficiency. Secondly, existing conical mills used for grinding permanent magnet materials can only process neodymium iron boron permanent magnet materials into powder of a single fixed particle size in actual use. They cannot flexibly adjust the grinding parameters to produce powder products of different particle sizes according to the different requirements of subsequent forming and sintering processes. This greatly limits the applicability of this type of grinding device and cannot adapt to the differentiated needs for the particle size of neodymium iron boron permanent magnet material powder in different application scenarios. Summary of the Invention

[0005] To address the above problems, one objective of this invention is to overcome these shortcomings, and more specifically, to provide a grinding device for neodymium iron boron permanent magnet materials, which can avoid the problem that the pressure plate cannot apply pressure to the permanent magnet material throughout the process, and can process permanent magnet material powders of different particle sizes by changing the ring liner.

[0006] In a first aspect, the present invention provides a grinding device for neodymium iron boron permanent magnet materials, specifically comprising: an upper shell; the upper shell being a cylindrical structure, with connecting rods fixedly installed at the four corners of the bottom of the upper shell, and vertical guide grooves evenly spaced on the inner wall of the upper shell; a lower shell disposed below the upper shell, the upper end face of the outer side of the lower shell being fixedly connected to the bottom of the connecting rods, and a support frame installed at the lower outer end of the lower shell; two ring plates disposed between the upper shell and the lower shell, the inner wall of the ring plates being provided with anti-slip protrusions, a gripping rod being disposed at the middle position of the outer side of the ring plates, and locking strips being fixedly installed on both outer sides of the ring plates; a movable ring being fitted around the outer side of the upper shell, and grinding rollers being disposed on the inner sides of the upper shell and the lower shell, the grinding rollers and the ring plates being at the same horizontal height.

[0007] Preferably, a feeding port is provided on the front side of the upper shell, and through grooves are provided on both outer sides of the upper shell.

[0008] Preferably, a connecting shaft is provided at the axial center position inside the lower housing, and a through-type discharge port is provided on the outer wall of the lower housing, and the bottom surface of the lower housing is inclined.

[0009] Preferably, the movable ring rests on the outer edge of the bottom of the upper housing, and pull handles are symmetrically arranged at both ends of the movable ring.

[0010] Preferably, the bottom two sides of the movable ring are provided with side plates, the side plates are through through grooves, and the inner wall of the side plates is attached to the outer wall of the two sets of assembled ring liners. The inner wall of the side plates is provided with two mating grooves, and the two mating grooves on the side plates can be inserted and mated with the locking strips on the two sets of ring liners respectively.

[0011] Preferably, the grinding roller has a conical structure, and anti-slip protrusions are provided on the outer wall of the grinding roller. A bottom rod is fixedly installed at the axial position at the bottom of the grinding roller, and the bottom rod is rotatably engaged with the connecting shaft.

[0012] Preferably, a fixing rod is fixedly installed on the top of the grinding roller, the upper end of the fixing rod passes through the upper housing and is connected to the motor drive, and a spiral drive groove is provided on the outer wall of the fixing rod.

[0013] Preferably, a pressure plate is slidably mounted on the fixed rod. The pressure plate has a trumpet-shaped structure, and the inner wall of the lower end of the pressure plate can fit against the outer wall of the grinding roller. Anti-slip protrusions are provided on the inner wall of the lower end of the pressure plate. A guide rod is provided in an annular shape on the upper outer end of the pressure plate, and the guide rod is slidably engaged with the guide groove.

[0014] Preferably, an assembly groove is provided on the outer side of the upper end of the pressure plate, and an electric telescopic rod is installed on the assembly groove. The electric telescopic rod can extend to the axial position of the pressure plate and slides in cooperation with the transmission groove.

[0015] 1. In this invention, a trumpet-shaped pressure plate is slidably installed on the fixed rod of the grinding roller, so that the inner wall of the lower end of the pressure plate can fit against the outer wall of the conical grinding roller. At the same time, the spiral transmission groove on the outer wall of the fixed rod cooperates with the electric telescopic rod on the pressure plate. When the grinding roller rotates, the pressure plate is driven to move continuously downward along the guide groove. With the help of the continuous downward pressure of the pressure plate, the permanent magnet material is fed under pressure throughout the process. This effectively solves the problem that the existing pressure plate cannot be adapted to the conical grinding roller and cannot continuously feed the material. It accelerates the grinding process of the permanent magnet material, significantly improves the overall processing efficiency, and can meet the needs of industrial-scale production.

[0016] 2. In this invention, by setting the upper and lower shells as a modular structure, two sets of ring liners can be detachably installed between them. The movable ring drives the side plate, and the ring liners are quickly fixed and disassembled by the mating groove on the inner wall of the side plate and the locking strip on the outside of the ring liners. By replacing the ring liners of different thicknesses, the gap between the grinding roller and the ring liners can be flexibly adjusted, thereby realizing the grinding and processing of permanent magnet material powders of different particle sizes. This greatly expands the applicability of the device and can adapt to the differentiated requirements of the particle size of permanent magnet material powders for different subsequent molding and sintering processes and different application scenarios. Attached Figure Description

[0017] The following accompanying drawings will provide a better understanding of the invention by those skilled in the art, and will more clearly demonstrate the advantages of the invention. The drawings described herein are for illustrative purposes only, representing selected embodiments and not all possible implementations, and are not intended to limit the scope of the invention.

[0018] In the attached diagram: Figure 1 A three-dimensional structural schematic diagram of an embodiment of the present invention is shown.

[0019] Figure 2 A split schematic diagram of an embodiment of the present invention is shown.

[0020] Figure 3 A schematic diagram of the internal structure of the upper housing according to an embodiment of the present invention is shown.

[0021] Figure 4 A schematic diagram of the cross-sectional structure of the middle part of an embodiment of the present invention is shown.

[0022] Figure 5 A schematic diagram of a planar cross-section structure according to an embodiment of the present invention is shown.

[0023] Figure 6 A schematic diagram of the connection structure between the grinding roller and the pressure plate according to an embodiment of the present invention is shown.

[0024] Figure 7 The embodiments of the present invention are shown by Figure 6 This leads to an enlarged structural diagram of part A.

[0025] Figure 8 A schematic diagram of the internal bottom side structure of an embodiment of the present invention is shown.

[0026] List of reference numerals 1. Upper housing; 101. Connecting rod; 102. Guide groove; 103. Feed port; 104. Through groove; 2. Lower housing; 201. Support frame; 202. Connecting shaft; 203. Discharge port; 3. Ring liner; 301. Clamping strip; 4. Movable ring; 401. Pull handle; 402. Side plate; 4021. Mating groove; 5. Grinding roller; 501. Bottom rod; 502. Fixing rod; 5021. Transmission groove; 6. Pressure plate; 601. Guide rod; 602. Assembly groove; 603. Electric telescopic rod. Detailed Implementation

[0027] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the described embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0028] Example 1: Please refer to Figures 1 to 8 As shown: This invention provides a grinding device for neodymium iron boron permanent magnet materials, comprising: an upper shell 1; the upper shell 1 is a cylindrical structure, and connecting rods 101 are fixedly installed at the four corners of the bottom of the upper shell 1, and vertical guide grooves 102 are equidistantly arranged on the inner wall of the upper shell 1; a lower shell 2 is arranged below the upper shell 1, the upper surface of the outer side of the lower shell 2 is fixedly connected to the bottom of the connecting rods 101, and a support frame 201 is installed at the lower outer end of the lower shell 2; two ring plates 3 are arranged between the upper shell 1 and the lower shell 2, the inner wall of the ring plates 3 is provided with anti-slip protrusions, and a gripping rod is arranged at the middle position of the outer side of the ring plates 3, and clips 301 are fixedly installed on both sides of the outer side of the ring plates 3; a movable ring 4 is fitted on the outer side of the upper shell 1, and grinding rollers 5 are arranged on the inner side of the upper shell 1 and the lower shell 2, and the grinding rollers 5 and the ring plates 3 are at the same horizontal height.

[0029] As a second embodiment of the present invention, based on the first embodiment, such as Figure 5 and Figure 8 As shown, the upper housing 1 has a feeding port 103 on its front side, and through grooves 104 on both sides of its exterior; the lower housing 2 has a connecting shaft 202 at its axial center, and a through-type discharge port 203 on its outer wall; the bottom surface of the lower housing 2 is inclined; the upper housing 1 and the lower housing 2 are provided so that permanent magnet material can be placed inside them for grinding; a connecting rod 101 is provided so that the upper housing 1 and the lower housing 2 can be connected and fixed; a guide groove 102 is provided so that the pressure plate 6 can... The fixed rod 502 serves as a guide when moving along it; a circular feeding port 103 is provided, through which permanent magnet material can be fed into the device; a through groove 104 is provided, through which the side plate 402 can pass and extend to the position between the upper shell 1 and the lower shell 2; a support frame 201 is provided, which can support the device; a connecting shaft 202 is provided, and through the rotational cooperation between the connecting shaft 202 and the bottom rod 501, stability can be maintained when the grinding roller 5 rotates; and a discharge port 203 is provided, through which the ground permanent magnet material can be discharged.

[0030] This application sets the upper shell 1 and lower shell 2 in a modular configuration, and installs two sets of ring plates 3 between the upper shell 1 and lower shell 2. When the permanent magnet material is put into the device, it can be ground by means of the friction between the grinding roller 5 and the inner wall of the ring plate 3. When it is necessary to process permanent magnet material powder of different particle sizes, the movable ring 4 is pulled upward to make the side plate 402 lose its limiting effect on the ring plate 3, and the ring plate 3 can be removed and replaced. Replacing the ring plate 3 with a ring plate of different thickness can change the gap between the grinding roller 5 and the ring plate 3, thereby grinding permanent magnet material powder of different particle sizes.

[0031] As a third embodiment of the present invention, based on embodiment one, such as Figure 4 As shown, the movable ring 4 rests on the outer edge of the bottom of the upper housing 1, and pull handles 401 are symmetrically arranged at both ends of the movable ring 4; side plates 402 are provided on both sides of the bottom of the movable ring 4, the side plates 402 pass through the through groove 104, and the inner wall of the side plates 402 is attached to the outer wall of the two sets of assembled ring bushings 3. Two mating grooves 4021 are provided on the inner wall of the side plates 402, and the two mating grooves 4021 on the side plates 402 can be inserted and mated with the retaining strips 301 on the two sets of ring bushings 3 respectively; A movable ring 4 is provided, on which two sets of side plates 402 can be installed; a pull handle 401 is provided, which can pull the movable ring 4 to move on the upper housing 1; the side plates 402 are provided, which can limit the detachable ring plates 3 between the upper housing 1 and the lower housing 2 by covering the two sets of ring liners 3 with the side plates 402; a mating groove 4021 is provided, which can make the side plates 402 and the ring liners 3 rigidly connected when the mating groove 4021 is inserted with the locking strip 301.

[0032] As a fourth embodiment of the present invention, based on embodiment one, such as Figure 5 and Figure 6 As shown, the grinding roller 5 has a conical structure, and anti-slip protrusions are provided on the outer wall of the grinding roller 5. A bottom rod 501 is fixedly installed at the axial position of the bottom of the grinding roller 5, and the bottom rod 501 is rotatably engaged with the connecting shaft 202. A fixing rod 502 is fixedly installed on the top of the grinding roller 5. The upper end of the fixing rod 502 passes through the upper housing 1 and is connected to the motor drive. A spiral transmission groove 5021 is provided on the outer wall of the fixing rod 502. The grinding roller 5 is provided so that by rotating the grinding roller 5, the permanent magnet material placed in the device can be moved from large to small. The small parts are ground; a bottom rod 501 is provided to keep the grinding roller 5 stable when it rotates and prevent shaking; a fixed rod 502 is provided to connect the grinding roller 5 to the motor, so that the motor drives the grinding roller 5 through the fixed rod 502; a transmission groove 5021 is provided, which allows the pressure plate 6 to move down inside the device and apply pressure to the material when the grinding roller 5 rotates, thereby grinding the permanent magnet material in conjunction with the rotation of the grinding roller 5.

[0033] As a fifth embodiment of the present invention, based on embodiment one, such as Figure 5 and Figure 6As shown, a pressure plate 6 is slidably mounted on the fixed rod 502. The pressure plate 6 has a trumpet-shaped structure, and the inner wall of the lower end of the pressure plate 6 can fit against the outer wall of the grinding roller 5. Anti-slip protrusions are provided on the inner wall of the lower end of the pressure plate 6. A guide rod 601 is provided in a ring shape on the upper outer end of the pressure plate 6. The guide rod 601 is slidably engaged with the guide groove 102. An assembly groove 602 is provided on the outer upper end of the pressure plate 6. An electric telescopic rod 603 is installed on the assembly groove 602. The electric telescopic rod 603 can extend to the axial position of the pressure plate 6 and is slidably engaged with the transmission groove 5021. The trumpet-shaped pressure plate 6 continuously reduces the distance between the pressure plate 6 and the grinding roller 5. The gap allows for grinding of the permanent magnet material between the pressure plate 6 and the grinding roller 5 from large to small. When the pressure plate 6 moves to its lowest position, the permanent magnet material can be ground into powder. A guide rod 601 is provided to guide the pressure plate 6 as it slides along the fixed rod 502. An assembly groove 602 is provided to install the electric telescopic rod 603 onto the pressure plate 6. The electric telescopic rod 603 is provided so that when the fixed rod 502 rotates, the pressure plate 6 moves downward along the guide groove 102 by pressing the electric telescopic rod 603 into the transmission groove 5021, thereby applying pressure to the permanent magnet material and feeding it.

[0034] This application installs a pressure plate 6 on the fixed rod 502 of the grinding roller 5, and extends the electric telescopic rod 603 on the pressure plate 6 into the transmission groove 5021. When the grinding roller 5 rotates, the transmission groove 5021 enables the pressure plate 6 to apply downward pressure to the permanent magnet material, and cooperates with the grinding roller 5 to grind the permanent magnet material. By setting the pressure plate 6 in a trumpet shape, the pressure plate 6 can be infinitely close to the grinding roller 5, pressing the permanent magnet material down throughout the process, and cooperating with the grinding roller 5 to quickly grind the permanent magnet material into powder.

[0035] The specific usage and function of this embodiment are as follows: In this invention, such as Figures 1 to 8As shown, according to the required particle size of the neodymium iron boron permanent magnet material powder, two sets of ring plates 3 of corresponding thickness are selected. The two sets of ring plates 3 are spliced ​​and installed between the upper shell 1 and the lower shell 2, so that the retaining strips 301 on both sides of the outer side of the ring plate 3 are aligned with the mating grooves 4021 on the inner wall of the side plate 402. The movable ring 4 is lowered so that the side plate 402 passes through the through grooves 104 on both sides of the outer side of the upper shell 1 and covers the outer side of the ring plate 3. The mating grooves 4021 and retaining strips 301 are inserted to place the neodymium iron boron permanent magnet to be ground. Raw materials, hydrogen-crushed coarse powder, or recycled waste are fed into the device through the feeding port 103 on the front side of the upper shell 1. The motor, connected to the upper end of the fixed rod 502, is started, driving the fixed rod 502 to rotate, which in turn drives the grinding roller 5 to rotate synchronously. The bottom rod 501 and the connecting shaft 202 rotate in coordination, ensuring the stability of the grinding roller 5 during rotation. When the grinding roller 5 rotates, the anti-slip protrusions on its outer wall cooperate with the anti-slip protrusions on the inner wall of the ring liner 3 to perform preliminary grinding of the fed permanent magnet material, while simultaneously fixing... The spiral transmission groove 5021 on the outer wall of rod 502 slides in engagement with the electric telescopic rod 603 on the pressure plate 6, driving the trumpet-shaped pressure plate 6 to slide downward along the guide groove 102. The downward pressure of the pressure plate 6 continuously presses down on the permanent magnet material, causing the permanent magnet material to be gradually ground to the required particle size between the grinding roller 5 and the ring liner 3. When it is necessary to change the grinding particle size specification, the movable ring 4 is pulled upward by the pull handles 401 at both ends of the movable ring 4, causing the side plate 402 to move upward synchronously, so that the mating groove 402 1. Disconnect from the clamping strip 301 to release the limiting position on the ring liner 3. Remove the ring liner 3 from both sides of the device and replace it with a ring liner 3 of the corresponding thickness. After repeating the above installation and fixing steps of the ring liner 3, the grinding of permanent magnet materials of different particle sizes can continue. After the permanent magnet material is ground to a certain particle size, it will leak down through the gap between the ring liner 3 and the grinding roller 5, and be collected by the inclined bottom surface of the lower housing 2 to the discharge port 203 on the outer wall of the lower housing 2, and discharged from the device through the discharge port 203.

[0036] The following points should be noted in this article: 1. The accompanying drawings of the embodiments of the present invention only involve the structures involved in the embodiments of the present invention; other structures can refer to general designs.

[0037] 2. Where there is no conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other to obtain new embodiments.

[0038] The above are merely specific embodiments of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A grinding device for neodymium iron boron permanent magnet materials, comprising: Upper shell (1); the upper shell (1) is a cylindrical structure, and connecting rods (101) are fixedly installed at the four corners of the bottom of the upper shell (1), and vertical guide grooves (102) are equidistantly arranged on the inner wall of the upper shell (1); characterized in that a lower shell (2) is provided below the upper shell (1), the upper end face of the outer side of the lower shell (2) is fixedly connected to the bottom of the connecting rods (101), and a support frame (201) is installed at the lower outer end of the lower shell (2), the upper shell (1) Two ring plates (3) are provided between the upper shell (1) and the lower shell (2). The inner wall of the ring plate (3) is provided with an anti-slip protrusion structure, and a gripping rod is provided at the middle position of the outer side of the ring plate (3). The outer sides of the ring plate (3) are fixedly installed with clips (301). The upper shell (1) is fitted with a movable ring (4), and grinding rollers (5) are provided on the inner sides of the upper shell (1) and the lower shell (2). The grinding rollers (5) and the ring plates (3) are at the same horizontal height.

2. The grinding device for neodymium iron boron permanent magnet materials according to claim 1, characterized in that: The upper shell (1) is provided with a feeding port (103) on the front side, and through grooves (104) are provided on both sides of the outer side of the upper shell (1).

3. The grinding device for neodymium iron boron permanent magnet materials according to claim 1, characterized in that: A connecting shaft (202) is provided at the axial position inside the lower housing (2), and a through-type discharge port (203) is provided on the outer wall of the lower housing (2). The bottom surface of the lower housing (2) is inclined.

4. The grinding device for neodymium iron boron permanent magnet materials according to claim 1, characterized in that: The movable ring (4) rests on the outer edge of the bottom of the upper shell (1), and pull handles (401) are symmetrically arranged at both ends of the movable ring (4).

5. The grinding device for neodymium iron boron permanent magnet material according to claim 1, characterized in that: The bottom sides of the movable ring (4) are provided with side plates (402), the side plates (402) pass through the through groove (104), and the inner wall of the side plates (402) is attached to the outer wall of the two sets of assembled ring liners (3). The inner wall of the side plates (402) is provided with two mating grooves (4021). The mating grooves (4021) on both sides of the side plates (402) can be inserted and mated with the clips (301) on the two sets of ring liners (3) respectively.

6. The grinding device for neodymium iron boron permanent magnet material according to claim 3, characterized in that: The grinding roller (5) has a conical structure and anti-slip protrusions are provided on the outer wall of the grinding roller (5). A bottom rod (501) is fixedly installed at the axial position at the bottom of the grinding roller (5). The bottom rod (501) is rotatably engaged with the connecting shaft (202).

7. The grinding device for neodymium iron boron permanent magnet material according to claim 1, characterized in that: A fixing rod (502) is fixedly installed on the top of the grinding roller (5). The upper end of the fixing rod (502) passes through the upper housing (1) and is connected to the motor drive. A spiral transmission groove (5021) is provided on the outer wall of the fixing rod (502).

8. A grinding device for neodymium iron boron permanent magnet materials according to claim 7, characterized in that: A pressure plate (6) is slidably mounted on the fixed rod (502). The pressure plate (6) has a trumpet-shaped structure, and the inner wall of the lower end of the pressure plate (6) can fit against the outer wall of the grinding roller (5). Anti-slip protrusions are provided on the inner wall of the lower end of the pressure plate (6). A guide rod (601) is provided in a ring shape on the upper outer end of the pressure plate (6). The guide rod (601) slides in cooperation with the guide groove (102).

9. A grinding device for neodymium iron boron permanent magnet materials according to claim 8, characterized in that: An assembly groove (602) is provided on the outer side of the upper end of the pressure plate (6). An electric telescopic rod (603) is installed on the assembly groove (602). The electric telescopic rod (603) can extend to the axial position of the pressure plate (6) and slides in cooperation with the transmission groove (5021).

Images