A rare earth permanent magnet grain boundary diffusion uniform coating device

Abstract

The present invention relates to the technical field of rare earth permanent magnet grain boundary diffusion equipment, and specifically to a rare earth permanent magnet grain boundary diffusion uniform coating device, comprising a base, a guide rod fixedly installed on the top of the base, the right side of the base close to the bottom is fixedly connected to the left side of a connecting plate, when the coating platform moves downward, it drives the linkage rack to move downward, the linkage rack can drive the linkage gear to rotate under the meshing force, the linkage gear drives the transmission gear to rotate under the meshing force, the transmission gear drives the deflection plate to rotate through the rotating rod, the deflection plate can drive the scraper rod to slide in the deflection plate during the deflection movement, the scraper rod moves laterally in the moving port due to the limiting action of the scraper rod at the moving port, the scraper rod drives the scraper to move laterally, the scraper can be prevented from deflecting under the limiting action of the limiting plate, the scraper presses the ink evenly into the screen printing plate, the excess ink is pushed onto the wedge block by the scraper, and the ink flows along the wedge block into the recovery bin under the action of gravity.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of rare earth permanent magnet grain boundary diffusion equipment, in particular to a rare earth permanent magnet grain boundary diffusion uniform coating device. BACKGROUND

[0002] Rare earth permanent magnets are widely used in computers, household appliances, power communication, automobiles, biological medicine and other fields due to their high comprehensive magnetic properties. With the development of electric vehicles and hybrid electric vehicles, it is required that neodymium iron boron has high coercivity and magnetic energy product. However, the Curie temperature of rare earth permanent magnets is relatively low, which leads to poor thermal stability of the magnets and easy thermal demagnetization at high temperatures, limiting the application range of the magnets. Therefore, how to improve the intrinsic coercivity of the magnets without losing the remanence has become the focus of researchers.

[0003] Grain boundary diffusion technology is a technology that can effectively improve the magnetic properties of sintered neodymium iron boron magnets developed in recent years. By forming a layer of heavy rare earth film on the surface of the magnetic steel, the heavy rare earth enters the magnet interior through vacuum heat treatment, and the heavy rare earth atoms replace the Nd atoms around the main phase grain to form a high coercivity shell. This unique microstructure can greatly improve the coercivity of the magnet with very low remanence drop.

[0004] Most of the rare earth permanent magnet grain boundary diffusion uniform coating devices on the market cannot uniformly spread the heavy rare earth powder prepared as ink on the printing plate when in use, which leads to the fact that the printing plate cannot uniformly coat the ink on the outer wall of the workpiece, thereby affecting the efficiency of subsequent rare earth permanent magnet grain boundary diffusion and bringing inconvenience to the work of the staff. SUMMARY

[0005] The purpose of the present application is to provide a rare earth permanent magnet grain boundary diffusion uniform coating device to solve the problem that the heavy rare earth powder cannot be uniformly prepared as ink and spread on the printing plate as mentioned in the background. To achieve the above purpose, the present application provides the following technical scheme: a rare earth permanent magnet grain boundary diffusion uniform coating device, comprising a base, a guide rod fixedly installed on the top of the base, a connecting plate fixedly connected to the left side of the base near the bottom, a hydraulic telescopic machine fixedly installed on the top of the connecting plate, an output end of the hydraulic telescopic machine fixedly connected to the bottom of a coating mechanism, a silk screen printing plate installed on the inner wall of the coating mechanism, the inner wall of the coating mechanism and the outer wall of the guide rod being in sliding connection, the top of the coating mechanism and the bottom of a feeding mechanism being fixedly connected, the inner wall of the coating mechanism and the outer wall of a scraping mechanism being in sliding connection, the inner wall of the scraping mechanism and the inner wall of the base being in rotary connection, and the outer wall of a supporting mechanism being in sliding connection with the inner bottom wall of the base.

[0006] Preferably, the inside of the base is provided with an expansion slot, and the inner bottom wall of the expansion slot is provided with a sliding slot for the sliding of the supporting mechanism.

[0007] Preferably, the coating mechanism comprises a pushing plate, a coating table, a wedge-shaped block, a recycling bin, a connecting block and a linkage rack, the bottom of the pushing plate is fixedly connected with the output end of the hydraulic expansion machine, and the left side of the pushing plate is fixedly connected with the right side close to the top of the coating table, the inner wall of the coating table is provided with a coating slot, and one side of the coating slot is provided with a recycling slot in communication with the recycling bin, the inner bottom wall of the recycling slot is fixedly connected with the bottom of the wedge-shaped block, and the recycling bin is installed on the left side of the coating table through bolts, the inner wall of the coating slot is provided with a moving port for the sliding of the scraping mechanism, and the right side close to the bottom of the coating table is fixedly connected with the left side of the connecting block, the bottom of the connecting block is fixedly connected with the top end of the linkage rack, and the outer wall of the linkage rack is meshedly connected with the outer wall of the scraping mechanism, and the top of the coating table is fixedly installed with a feeding mechanism, and the four corners of the coating table are provided with plug-in holes for the sliding plug-in of guide rods.

[0008] Preferably, the feeding mechanism comprises a feeding bin, a feeding pipe, a sealing cover and a guide block, the bottom of the feeding bin is fixedly connected with the top of the coating table, and the inner top wall of the feeding bin is fixedly connected with the bottom end of the feeding pipe, the outer wall of the top end of the feeding pipe is hingedly connected with the inner wall of the sealing cover, and the inner side wall of the feeding bin is fixedly connected with the outer wall of the guide block.

[0009] Preferably, the scraping mechanism comprises a scraper, a limiting plate, a scraping rod, a deflection plate, a rotating rod, a transmission gear and a linkage gear, the bottom of the scraper is movably abutted with the top of the silk screen plate, the outer wall close to the middle of the scraper is provided with the limiting plate, the outer wall of the limiting plate is slidably connected with the inner wall of the coating slot, and the outer wall close to the top of the scraper is fixedly connected with one end of the scraping rod, the outer wall of the scraping rod is slidably abutted with the inner wall of the deflection plate, the inner wall of the side of the deflection plate away from the scraping rod is hingedly connected with the inner wall of the rotating rod, the outer wall of the rotating rod is hingedly connected with the inner wall of the transmission gear, the outer wall of the transmission gear is meshedly connected with the outer wall of the linkage gear, the outer wall of the linkage gear is meshedly connected with the outer wall of the linkage rack, and the inside of the base is provided with a rotating cavity for the rotation of the linkage gear and the transmission gear.

[0010] Preferably, the supporting mechanism comprises a supporting table, a fixed plate, a fixed block, a connecting block, a sliding rod, a sliding block and a compression spring, both sides of the supporting table are fixedly provided with the fixed plates, the bottom of the supporting table is fixedly provided with the fixed block, the outer wall of the fixed block is rotationally connected with the connecting block, the inner wall of the connecting block away from the fixed block is rotationally connected with the outer wall of the sliding rod, the outer wall of the sliding rod away from the connecting block is clampingly connected with the inner wall of the sliding block, the outer wall of the sliding block is fixedly connected with one end of the compression spring, the other end of the compression spring is fixedly connected with the inner wall of the sliding groove, and the outer wall of the sliding block is slidingly connected with the inner wall of the sliding groove, the top of the base is provided with a supporting groove for abutting and supporting the fixed plate, and the top of the supporting table is provided with a clamping groove for fixing and limiting the workpiece.

[0011] Preferably, the coating groove is a through opening through the coating table, and the inner wall of the coating groove close to the bottom is clampingly connected with the outer wall of the silk screen plate, and the lower part of the coating groove close to the moving opening is provided with a limiting groove for sliding of the limiting plate.

[0012] Preferably, the inner wall of the moving opening is slidingly connected with the outer wall of the scraping rod, and the scraper is arranged in the interior of the coating groove.

[0013] Compared with the prior art, the present application has the following advantages:

[0014] In the present application, the hydraulic telescopic machine drives the coating table to move downward by the pushing plate, the downward movement of the coating table drives the linkage rack to move downward, the linkage rack can drive the linkage gear to rotate under the meshing force, the linkage gear drives the transmission gear to rotate under the meshing force, the transmission gear drives the rotating rod to rotate, the rotating rod drives the deflection plate to rotate, the deflection plate can drive the scraping rod to slide in the deflection plate under the deflection movement, the scraping rod moves transversely in the moving opening under the limiting action of the limiting plate, the scraping rod can avoid deviation under the limiting force of the limiting plate, the scraper uniformly pushes the ink into the silk screen plate, the excess ink is pushed to the wedge-shaped block by the scraper, and the ink flows to the recycling bin along the wedge-shaped block under the action of gravity, so that the ink can be uniformly coated on the surface of the workpiece, and the work of the grain boundary diffusion of the rare earth permanent magnet is facilitated.

[0015] In the present application, the hydraulic telescopic machine can complete the uniform scraping and coating of the ink while coating the workpiece by the coating table, realizes linkage of functions, realizes the coating operation while realizing the scraping and coating, reduces the energy consumption, and brings convenience to the use of people.

[0016] In the application, the coating table abuts against the base, and then drives the silk screen printing plate and the top of the workpiece to abut, so that the support table drives the fixed plate to move downward and abut against the support groove, the support table moves downward to drive the fixed block to move downward, the fixed block drives the adapter block to move downward, the adapter block drives the sliding block to slide in the sliding groove through the sliding rod, the sliding block extrudes the compression spring, and the ink adhered in the silk screen printing plate is coated on the top of the workpiece under the extrusion force, the hydraulic telescopic machine is started in reverse, the hydraulic telescopic machine drives the coating table to reset, and after the coating table is separated from the top of the workpiece, the sliding block resets under the telescopic force of the compression spring, and the sliding block lifts the support table from the support groove through the adapter block, thereby bringing convenience for people to take down the workpiece. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 It is a schematic diagram of the overall structure of the application;

[0018] Figure 2 It is a sectional view of the application;

[0019] Figure 3 It is a schematic diagram of part of the structure of the application;

[0020] Figure 4 It is an enlarged view of structure A in the application; Figure 2

[0021] Figure 5 It is a sectional view of the coating mechanism and the feeding mechanism of the application;

[0022] Figure 6 It is an exploded view of the coating mechanism and the feeding mechanism of the application;

[0023] Figure 7 It is a schematic diagram of the support mechanism structure of the application;

[0024] Figure 8 It is a schematic diagram of the doctor blade coating mechanism structure of the application.

[0025] In the figure: 1, base; 2, guide rod; 3, connecting plate; 4, hydraulic telescopic machine; 5, coating mechanism; 501, push plate; 502, coating table; 503, wedge-shaped block; 504, recovery bin; 505, connecting block; 506, linkage rack; 6, feeding mechanism; 601, feeding bin; 602, feeding pipe; 603, sealing cover; 604, guide block; 7, doctor blade coating mechanism; 701, doctor blade; 702, limiting plate; 703, scraping rod; 704, deflection plate; 705, rotating rod; 706, transmission gear; 707, linkage gear; 8, support mechanism; 801, support table; 802, fixed plate; 803, fixed block; 804, adapter block; 805, sliding rod; 806, sliding block; 807, compression spring; 9, silk screen printing plate. DETAILED DESCRIPTION​

[0026] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the protection scope of the present application.

[0027] Please refer to Figures 1 to 8 , the present application provides a technical scheme: a rare earth permanent magnet grain boundary diffusion uniform coating device, including base 1, the top of base 1 is fixedly installed with guide rod 2, the right side of base 1 close to the bottom is fixedly connected with the left side of connecting plate 3, the top of connecting plate 3 is fixedly installed with hydraulic telescopic machine 4, the output end of hydraulic telescopic machine 4 is fixedly connected with the bottom of coating mechanism 5, the inner wall of coating mechanism 5 is installed with silk screen 9, the inner wall of coating mechanism 5 is slidably connected with the outer wall of guide rod 2, the top of coating mechanism 5 is fixedly connected with the bottom of feeding mechanism 6, the inner wall of coating mechanism 5 is slidably connected with the outer wall of scraping mechanism 7, the inner wall of scraping mechanism 7 is rotatably connected with the inner wall of base 1, the inner bottom wall of base 1 is slidably connected with the outer wall of supporting mechanism 8.

[0028] In the embodiment, as shown in Figures 1 to 8 , the inside of base 1 is provided with telescopic groove, and the inner bottom wall of telescopic groove is provided with sliding groove for supporting mechanism 8 to slide.

[0029] In the embodiment, as shown in Figures 1 to 8 , coating mechanism 5 includes push plate 501, coating table 502, wedge block 503, recovery bin 504, connecting block 505 and linkage rack 506, the bottom of push plate 501 is fixedly connected with the output end of hydraulic telescopic machine 4, and the left side of push plate 501 is fixedly connected with the right side of coating table 502 close to the top, the inner wall of coating table 502 is provided with coating groove, and one side of coating groove is provided with recovery groove communicated with recovery bin 504, the inner bottom wall of recovery groove is fixedly connected with the bottom of wedge block 503, and recovery bin 504 is installed on the left side of coating table 502 through bolts, the inner wall of coating groove is provided with moving port for scraping mechanism 7 to slide, and the right side of coating table 502 close to the bottom is fixedly connected with the left side of connecting block 505, the bottom of connecting block 505 is fixedly connected with the top end of linkage rack 506, and the outer wall of linkage rack 506 is meshingly connected with the outer wall of scraping mechanism 7, the top of coating table 502 is fixedly installed with feeding mechanism 6, and the four corners of coating table 502 are provided with plug-in holes for guide rod 2 to slide and plug in, hydraulic telescopic machine 4 drives coating table 502 to move downward through push plate 501, and coating table 502 moves downward to drive linkage rack 506 to move downward.

[0030] In the embodiment, asFigures 1 to 8 As shown in the figure, the feeding mechanism 6 includes a feeding bin 601, a feeding pipe 602, a sealing cover 603 and a guide block 604, the bottom of the feeding bin 601 is fixedly connected with the top of the coating table 502, the inner top wall of the feeding bin 601 is fixedly connected with the bottom end of the feeding pipe 602, the outer wall of the top end of the feeding pipe 602 is hingedly connected with the inner wall of the sealing cover 603, and the inner side wall of the feeding bin 601 is fixedly connected with the outer wall of the guide block 604. The ink is injected into the coating table 502 through the feeding pipe 602 and stays on the screen printing plate 9. The sealing cover 603 is covered on the feeding pipe 602, so that dust or other sundries can be prevented from entering the coating table 502.

[0031] In this embodiment, as shown in the figure, Figures 1 to 8 As shown in the figure, the scraping mechanism 7 includes a scraper 701, a limiting plate 702, a scraping rod 703, a deflection plate 704, a rotating rod 705, a transmission gear 706 and a linkage gear 707. The bottom of the scraper 701 is movably abutted with the top of the screen printing plate 9, the outer wall of the middle part of the scraper 701 is provided with the limiting plate 702, the outer wall of the limiting plate 702 is slidably connected with the inner wall of the coating groove, the outer wall of the top part of the scraper 701 is fixedly connected with one end of the scraping rod 703, the outer wall of the scraping rod 703 is slidably abutted with the inner wall of the deflection plate 704, the inner wall of the side of the deflection plate 704 away from the scraping rod 703 is hingedly connected with the inner wall of the rotating rod 705, the outer wall of the rotating rod 705 is hingedly connected with the inner wall of the transmission gear 706, the outer wall of the transmission gear 706 is meshingly connected with the outer wall of the linkage gear 707, the outer wall of the linkage gear 707 is meshingly connected with the outer wall of the linkage rack 506, and the inside of the base 1 is provided with a rotating cavity for the rotation of the linkage gear 707 and the transmission gear 706. Under the meshing force, the linkage rack 506 can drive the linkage gear 707 to rotate, the linkage gear 707 drives the transmission gear 706 to rotate under the meshing force, the transmission gear 706 drives the rotating rod 705 to rotate, the rotating rod 705 drives the deflection plate 704 to rotate, the deflection plate 704 can drive the scraping rod 703 to slide in the deflection plate 704 when the deflection plate 704 is deflected, the scraping rod 703 moves horizontally in the mouth under the limiting action of the mouth, the scraping rod 703 drives the scraper 701 to move horizontally, and the scraper 701 can be prevented from deviating under the limiting force of the limiting plate 702. The scraper 701 uniformly presses the ink into the screen printing plate 9, and the excess ink is pushed to the wedge-shaped block 503 by the scraper 701, and flows to the recycling bin 504 along the wedge-shaped block 503 under the action of gravity.

[0032] In this embodiment, as shown in the figure, Figures 1 to 8As shown, the supporting mechanism 8 includes a supporting platform 801, a fixed plate 802, a fixed block 803, a connecting block 804, a sliding rod 805, a sliding block 806 and a compression spring 807. Fixed plates 802 are fixedly installed on both sides of the supporting platform 801, and a fixed block 803 is fixedly installed on the bottom of the supporting platform 801. The outer wall of the fixed block 803 is rotatably connected with the connecting block 804, and the inner wall of the connecting block 804 away from the fixed block 803 is rotatably connected with the outer wall of the sliding rod 805. The outer wall of the sliding rod 805 away from the connecting block 804 is engaged with the inner wall of the sliding block 806, and the outer wall of the sliding block 806 is fixedly connected to one end of the compression spring 807, and the other end of the compression spring 807 is fixedly connected to the inner wall of the sliding groove, and the outer wall of the sliding block 806 is slidably connected to the inner wall of the sliding groove. A space is provided on the top of the base 1 for the fixed plate 802 to enter The support groove is abutted against the support, and a slot is provided on the top of the support table 801 to fix and limit the workpiece. The support table 801 drives the fixed plate 802 to move downward and abut against the support groove. When the support table 801 moves downward, it will drive the fixed block 803 to move downward, and the fixed block 803 drives the connecting block 804 to move downward. The connecting block 804 drives the sliding block 806 to slide in the sliding groove through the sliding rod 805. The sliding block 806 squeezes the compression spring 807. Under the squeezing force, the ink adhered to the screen printing plate 9 is coated on the top of the workpiece. The hydraulic telescopic machine 4 is started in the reverse direction. The hydraulic telescopic machine 4 drives the coating table 502 to reset. After the coating table 502 is separated from the top of the workpiece, the sliding block 806 is reset under the telescopic force of the compression spring 807. The sliding block 806 lifts the support table 801 from the support groove through the connecting block 804.

[0033] In this embodiment, Figures 1 to 8 As shown, the coating groove is a through opening that passes through the coating table 502, and the inner wall of the coating groove near the bottom is engaged with the outer wall of the screen printing plate 9. A limiting groove for the limiting plate 702 to slide is provided below the moving opening of the coating groove. The scraping rod 703 drives the scraper 701 to move horizontally, and the scraper 701 can be prevented from deflecting under the limiting force of the limiting plate 702.

[0034] In this embodiment, Figures 1 to 8 As shown, the inner wall of the moving port is slidably connected to the outer wall of the scraping rod 703, and the scraper 701 is arranged inside the coating tank.

[0035] The use method and advantages of the present invention: When the rare earth permanent magnet grain boundary diffusion uniform coating device is in operation, the working process is as follows:

[0036] like Figures 1 to 8As shown, the ink is injected into the coating table 502 through the feed pipe 602 and stays on the screen printing plate 9, the hydraulic telescopic machine 4 is started, the hydraulic telescopic machine 4 drives the coating table 502 to move downwards by pushing the plate 501, the coating table 502 moves downwards and drives the linkage rack 506 to move downwards, the linkage rack 506 can drive the linkage gear 707 to rotate under the meshing force, the linkage gear 707 drives the transmission gear 706 to rotate under the meshing force, the transmission gear 706 drives the rotating rod 705 to rotate, the rotating rod 705 drives the deflection plate 704 to rotate, the deflection plate 704 can drive the scraping rod 703 to slide in the deflection plate 704 when the deflection plate 704 moves, the scraping rod 703 moves horizontally in the moving mouth under the limiting action of the moving mouth, the scraping rod 703 drives the scraper 701 to move horizontally, the scraper 701 can avoid deviation under the limiting force of the limiting plate 702, the scraper 701 uniformly presses the ink into the screen printing plate 9, and the excess ink is pushed to the wedge-shaped block 503 by the scraper 701, and the ink flows to the recycling bin 504 along the wedge-shaped block 503 under the action of gravity.

[0037] The workpiece is fixed in the clamping groove of the support table 801, the hydraulic telescopic machine 4 drives the coating table 502 to move downwards, the coating table 502 can move downwards along the guide rod 2 under the guidance of the guide rod 2 and abuts against the top of the base 1, the coating table 502 abuts against the base 1 and drives the screen printing plate 9 to abut against the top of the workpiece, the support table 801 drives the fixed plate 802 to move downwards and abut against the support groove, the support table 801 moves downwards and drives the fixed block 803 to move downwards, the fixed block 803 drives the link block 804 to move downwards, the link block 804 drives the sliding block 806 to slide in the sliding groove through the sliding rod 805, the sliding block 806 extrudes the compression spring 807, the ink adhered to the screen printing plate 9 is coated on the top of the workpiece under the extrusion force, the hydraulic telescopic machine 4 is started in reverse, the hydraulic telescopic machine 4 drives the coating table 502 to reset, the coating table 502 is separated from the top of the workpiece, and the sliding block 806 resets under the extension force of the compression spring 807, the support table 801 is lifted from the support groove through the link block 804.

[0038] The basic principle, main features and advantages of the present application are shown and described above. It should be understood by those skilled in the art that the present application is not limited to the above-mentioned embodiments, and the above-mentioned embodiments and descriptions in the specification are only preferred examples of the present application and are not intended to limit the present application. Without departing from the spirit and scope of the present application, various changes and improvements can be made to the present application, and these changes and improvements all fall within the scope of the claimed present application. The scope of protection of the present application is defined by the appended claims and their equivalents.

Claims

1. A device for uniformly coating grain boundary diffusion of rare earth permanent magnets, comprising a base (1), a guide rod (2) fixedly mounted on the top of the base (1), a right side of the base (1) near the bottom being fixedly connected to the left side of a connecting plate (3), a hydraulic telescopic machine (4) fixedly mounted on the top of the connecting plate (3), characterized in that: The output end of the hydraulic telescopic machine (4) is fixedly connected to the bottom of the coating mechanism (5), the inner wall of the coating mechanism (5) is installed with a screen printing plate (9), the inner wall of the coating mechanism (5) is slidably connected to the outer wall of the guide rod (2), the top of the coating mechanism (5) is fixedly connected to the bottom of the feeding mechanism (6), the inner wall of the coating mechanism (5) is slidably connected to the outer wall of the scraping mechanism (7), the inner wall of the scraping mechanism (7) is rotatably connected to the inner wall of the base (1), and the inner bottom wall of the base (1) is slidably connected to the outer wall of the support mechanism (8); The coating mechanism (5) comprises a push plate (501), a coating table (502), a wedge block (503), a recovery bin (504), a connecting block (505) and a linkage rack (506). The bottom of the push plate (501) is fixedly connected to the output end of the hydraulic telescopic machine (4), and the left side of the push plate (501) is fixedly connected to the right side of the coating table (502) near the top. A coating groove is provided on the inner wall of the coating table (502), and a recovery groove is provided on one side of the coating groove, which is connected to the recovery bin (504). The inner bottom wall is fixedly connected to the bottom of the wedge block (503), and the recovery bin (504) is mounted on the left side of the coating table (502) by bolts. The inner wall of the coating tank is provided with a movable opening for sliding the scraping mechanism (7), and the right side of the coating table (502) near the bottom is fixedly connected to the left side of the connecting block (505). The bottom of the connecting block (505) is fixedly connected to the top of the linkage rack (506). The hydraulic telescopic machine (4) drives the coating table (502) to move downward, thereby driving the screen printing plate (9) to abut against the top of the workpiece. The scraping mechanism (7) comprises a scraper (701), a limiting plate (702), a scraping rod (703), a deflection plate (704), a rotating rod (705), a transmission gear (706) and a linkage gear (707), wherein the bottom of the scraper (701) is in movably contact with the top of the screen printing plate (9), and a limiting plate (702) is provided on the outer wall of the scraper (701) near the middle, the outer wall of the limiting plate (702) is slidably connected to the inner wall of the coating tank, and the outer wall of the scraper (701) near the top is fixedly connected to one end of the scraping rod (703), and the outer wall of the scraping rod (703) is in contact with the deflection plate (704). The inner wall of the deflection plate (704) slides against the inner wall of the deflection plate (704), and the inner wall of the side away from the scraping rod (703) is engaged with the inner wall of the rotating rod (705). The outer wall of the rotating rod (705) is engaged with the inner wall of the transmission gear (706), and the outer wall of the transmission gear (706) is meshed with the outer wall of the linkage gear (707). The outer wall of the linkage gear (707) is meshed with the outer wall of the linkage rack (506). A rotating chamber for rotating the linkage gear (707) and the transmission gear (706) is provided inside the base (1). The scraper (701) presses the ink evenly into the screen printing plate (9).

2. The device for uniformly coating a rare earth permanent magnet by grain boundary diffusion according to claim 1, characterized in that: A telescopic slot is provided inside the base (1), and a sliding slot for the supporting mechanism (8) to slide is provided on the inner bottom wall of the telescopic slot.

3. The device for uniformly coating a rare earth permanent magnet by grain boundary diffusion according to claim 1, characterized in that: The outer wall of the linkage rack (506) is meshedly connected with the outer wall of the scraping mechanism (7), and a feeding mechanism (6) is fixedly installed on the top of the coating table (502). The four corners of the coating table (502) are provided with plug holes for the guide rods (2) to be slidably plugged in.

4. The device for uniformly coating a rare earth permanent magnet by grain boundary diffusion according to claim 3, characterized in that: The feeding mechanism (6) comprises a feeding bin (601), a feeding pipe (602), a sealing cover (603) and a guide block (604); the bottom of the feeding bin (601) is fixedly connected to the top of the coating station (502), and the inner top wall of the feeding bin (601) is fixedly connected to the bottom end of the feeding pipe (602); the outer wall of the top end of the feeding pipe (602) is snap-connected to the inner wall of the sealing cover (603), and the inner side wall of the feeding bin (601) is fixedly connected to the outer wall of the guide block (604).

5. The device for uniformly coating a rare earth permanent magnet by grain boundary diffusion according to claim 2, characterized in that: The support mechanism (8) comprises a support platform (801), a fixed plate (802), a fixed block (803), a connecting block (804), a sliding rod (805), a sliding block (806) and a compression spring (807). The fixed plates (802) are fixedly installed on both sides of the support platform (801), and the fixed block (803) is fixedly installed on the bottom of the support platform (801). The outer wall of the fixed block (803) is rotatably connected to the connecting block (804), and the inner wall of the connecting block (804) away from the fixed block (803) is connected to the outer wall of the sliding rod (805). The outer wall of the sliding rod (805) away from the connecting block (804) is engaged with the inner wall of the sliding block (806), and the outer wall of the sliding block (806) is fixedly connected to one end of the compression spring (807), and the other end of the compression spring (807) is fixedly connected to the inner wall of the sliding groove, and the outer wall of the sliding block (806) is slidably connected to the inner wall of the sliding groove, and the top of the base (1) is provided with a support groove for the fixed plate (802) to abut and support, and the top of the support table (801) is provided with a card slot for fixing and limiting the workpiece.

6. The device for uniformly coating a rare earth permanent magnet by grain boundary diffusion according to claim 3, characterized in that: The coating groove is a through opening that passes through the coating platform (502), and the inner wall of the coating groove near the bottom is engaged with the outer wall of the screen printing plate (9). A limiting groove for the limiting plate (702) to slide is provided below the movable opening of the coating groove.

7. The device for uniformly coating a rare earth permanent magnet by grain boundary diffusion according to claim 3, characterized in that: The inner wall of the movable port is slidably connected to the outer wall of the scraping rod (703), and the scraper (701) is arranged inside the coating tank.

Images