Rare earth permanent magnet grain boundary diffusion uniform coating device

Abstract

The invention relates to the technical field of rare earth permanent magnet grain boundary diffusion equipment, in particular to a rare earth permanent magnet grain boundary diffusion uniform coating device which comprises a base, a guide rod is fixedly mounted at the top of the base, and the right side, close to the bottom, of the base is fixedly connected with the left side of a connecting plate. When the coating table moves downwards, a linkage rack can be driven to move downwards, the linkage rack can drive a linkage gear to rotate under the meshing acting force, the linkage gear drives a transmission gear to rotate under the meshing acting force, the transmission gear drives a deflection plate to rotate through a rotating rod, and the deflection plate can drive a scraping rod to slide in the deflection plate during deflection movement. The scraping rod transversely moves in the moving opening under the limiting action of the moving opening, the scraping rod drives the scraper to transversely move, the scraper can be prevented from deviating under the limiting acting force of the limiting plate, ink is evenly pressed into the screen printing plate through the scraper, redundant ink is pushed to the wedge-shaped block by the scraper, and therefore the ink can be evenly scraped. And the printing ink flows into the recovery bin along the wedge-shaped block under the action of gravity.

Description

Technical Field

[0001] The present invention relates to the technical field of grain boundary diffusion equipment for rare earth permanent magnets, and specifically relates to a device for uniformly coating grain boundary diffusion of rare earth permanent magnets. Background Technique

[0002] Rare earth permanent magnets are widely used in fields such as computers, household appliances, power communication, automobiles, biomedicine, etc. due to their high comprehensive magnetic properties. With the development of electric vehicles and hybrid vehicles, there is a requirement for neodymium iron boron to have high coercivity and magnetic energy product. However, the Curie temperature of rare earth permanent magnets themselves is relatively low, resulting in poor thermal stability of the magnets and easy thermal demagnetization at high temperatures, which limits the application range of the magnets. Therefore, how to improve the intrinsic coercivity of the magnets on the premise of basically not losing the remanence has become the focus of research by industry insiders.

[0003] The grain boundary diffusion technology is a technical means developed in recent years that can effectively improve the magnetic properties of sintered neodymium iron boron magnets. By forming a heavy rare earth film on the surface of the magnetic steel and subjecting it to vacuum heat treatment, the heavy rare earth enters the interior of the magnet along the grain boundaries. At the same time, the heavy rare earth atoms replace the Nd atoms around the main phase grains to form a high coercivity shell layer. This unique microstructure can significantly improve the coercivity of the magnet on the basis of a very low remanence drop value.

[0004] At present, when most of the grain boundary diffusion and uniform coating devices for rare earth permanent magnets on the market are in use, they cannot prepare the heavy rare earth powder into ink and evenly apply it on the printing plate, resulting in the printing plate being unable to evenly coat the ink on the outer wall of the workpiece, thereby affecting the efficiency of subsequent grain boundary diffusion of rare earth permanent magnets and bringing inconvenience to the work of the staff. Summary of the Invention

[0005] The purpose of the present invention is to provide a device for uniformly coating grain boundary diffusion of rare earth permanent magnets to solve the problem proposed in the above background technique that the heavy rare earth powder cannot be prepared into ink and evenly applied on the printing plate. To achieve the above purpose, the present invention provides the following technical solution: A device for uniformly coating grain boundary diffusion of rare earth permanent magnets, including a base, a guide rod is fixedly installed on the top of the base, the right side near the bottom of the base is fixedly connected to the left side of a connecting plate, a hydraulic telescopic machine is fixedly installed on the top of the connecting plate, the output end of the hydraulic telescopic machine is fixedly connected to the bottom of a coating mechanism, a screen printing plate is installed on the inner wall of the coating mechanism, the inner wall of the coating mechanism is slidably connected to the outer wall of the guide rod, the top of the coating mechanism is fixedly connected to the bottom of a feeding mechanism, the inner wall of the coating mechanism is slidably connected to the outer wall of a scraping mechanism, the inner wall of the scraping mechanism is rotatably connected to the inner wall of the base, and the inner bottom wall of the base is slidably connected to the outer wall of a supporting mechanism.

[0006] Preferably, a telescopic groove is formed inside the base, and a sliding groove for the support mechanism to slide is formed on the inner bottom wall of the telescopic groove.

[0007] Preferably, the coating mechanism includes a pushing plate, a coating table, a wedge block, a recovery bin, a connecting block, and a linkage rack. The bottom of the pushing plate is fixedly connected to the output end of the hydraulic telescopic machine, and the left side of the pushing plate is fixedly connected to the right side near the top of the coating table. A coating groove is formed in the inner wall of the coating table, and a recovery groove communicating with the recovery bin is formed on one side of the coating groove. The bottom of the recovery groove is fixedly connected to the bottom of the wedge block, and the recovery bin is installed on the left side of the coating table by bolts. A moving port for the scraping mechanism to slide is formed in the inner wall of the coating groove, and the right side near the bottom of the coating table is fixedly connected to the left side of the connecting block. The bottom of the connecting block is fixedly connected to the top end of the linkage rack, and the outer wall of the linkage rack is meshed with the outer wall of the scraping mechanism. A feeding mechanism is fixedly installed on the top of the coating table, and plug holes for the guide rods to slide and be inserted are formed at the four corners of the coating table.

[0008] Preferably, the feeding mechanism includes a feeding bin, a feeding pipe, a sealing cover, and a guiding block. The bottom of the feeding bin is fixedly connected to the top of the coating table, and the inner top wall of the feeding bin is fixedly connected to the bottom end of the feeding pipe. The outer wall of the top end of the feeding pipe is snap-fitted with the inner wall of the sealing cover, and the inner side wall of the feeding bin is fixedly connected to the outer wall of the guiding block.

[0009] Preferably, the scraping mechanism includes a scraper, a limiting plate, a scraping rod, a deflecting plate, a rotating rod, a transmission gear, and a linkage gear. The bottom of the scraper is movably abutted against the top of the screen printing plate, and a limiting plate is arranged on the outer wall near the middle of the scraper. The outer wall of the limiting plate is slidably connected to the inner wall of the coating groove, and the outer wall near the top of the scraper is fixedly connected to one end of the scraping rod. The outer wall of the scraping rod is slidably abutted against the inner wall of the deflecting plate, and the inner wall on the side of the deflecting plate away from the scraping rod is snap-fitted with the inner wall of the rotating rod. The outer wall of the rotating rod is snap-fitted with the inner wall of the transmission gear, and the outer wall of the transmission gear is meshed with the outer wall of the linkage gear. The outer wall of the linkage gear is meshed with the outer wall of the linkage rack, and a rotating cavity for the linkage gear and the transmission gear to rotate is formed inside the base.

[0010] Preferably, the support mechanism includes a support table, a fixing plate, a fixing block, an adapter block, a sliding rod, a sliding block and a compression spring. Fixing plates are fixedly installed on both sides of the support table, and a fixing block is fixedly installed at the bottom of the support table. The outer wall of the fixing block is rotatably connected to the adapter block, and the inner wall of the adapter block away from the fixing block is rotatably connected to the outer wall of the sliding rod. The outer wall of the sliding rod away from the adapter block is snap-connected to the inner wall of the sliding block, and the outer wall of the sliding block is fixedly connected to one end of the compression spring. The other end of the compression spring is fixedly connected to the inner wall of the sliding groove, and the outer wall of the sliding block is slidably connected to the inner wall of the sliding groove. A support groove for the fixing plate to abut and support is formed at the top of the base, and a clamping groove for fixing and limiting the workpiece is formed at the top of the support table.

[0011] Preferably, the coating groove is a through port penetrating the coating table, and the inner wall of the coating groove near the bottom is snap-connected to the outer wall of the screen printing plate. A limiting groove for the limiting plate to slide is formed below the coating groove near the moving port.

[0012] Preferably, the inner wall of the moving port is slidably connected to the outer wall of the scraping rod, and the scraping knife is arranged inside the coating groove.

[0013] Compared with the prior art, the beneficial effects of the present invention are as follows: In the present invention, the hydraulic telescopic machine drives the coating table to move downward through the pushing plate. When the coating table moves downward, it drives the linkage rack to move downward. Under the meshing action, the linkage rack can drive the linkage gear to rotate. The linkage gear drives the transmission gear to rotate under the meshing action. The transmission gear drives the rotating rod to rotate, and the rotating rod drives the deflecting plate to rotate. When the deflecting plate deflects, it can drive the scraping rod to slide inside the deflecting plate. The scraping rod moves horizontally in the moving port under the limiting action of the moving port. The scraping rod drives the scraping knife to move horizontally. Under the limiting action of the limiting plate, the scraping knife can be prevented from shifting. The scraping knife evenly presses the ink into the screen printing plate. The excess ink is pushed by the scraping knife onto the wedge-shaped block, and the ink flows along the wedge-shaped block into the recovery bin under the action of gravity, so that the ink can be evenly coated on the surface of the workpiece, which brings convenience to the grain boundary diffusion work of rare earth permanent magnets.

[0014] In the present invention, the hydraulic telescopic machine can drive the coating table to perform coating operations on the workpiece while evenly scraping the ink, realizing the linkage of functions, realizing the coating operation while realizing scraping, reducing energy consumption, and bringing convenience to people's use.

[0015] In the present invention, after the coating table abuts against the base, it drives the screen printing plate to abut against the top of the workpiece, causing the support table to drive the fixing plate to move downward and abut against the support groove. When the support table moves downward, it drives the fixing block to move downward, and the fixing block drives the connecting block to move downward. The connecting block drives the sliding block to slide in the sliding groove through the sliding rod, and the sliding block squeezes the compression spring. Under the squeezing force, the ink adhered in the screen printing plate is coated on the top of the workpiece. Reverse-start the hydraulic telescopic machine, and the hydraulic telescopic machine drives the coating table to reset. After the coating table disengages from the top of the workpiece, under the telescopic force of the compression spring, the sliding block resets, and the sliding block lifts the support table out of the support groove through the connecting block, facilitating people to remove the workpiece. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 is a schematic diagram of the overall structure of the present invention; Figure 2 is a cross-sectional view of the present invention; Figure 3 is a schematic diagram of a partial structure of the present invention; Figure 4 For the present invention Figure 2 is an enlarged view of the structure at A in; Figure 5 is a cross-sectional view of the coating mechanism and the feeding mechanism of the present invention; Figure 6 is an exploded view of the coating mechanism and the feeding mechanism of the present invention; Figure 7 is a schematic diagram of the structure of the support mechanism of the present invention; Figure 8 is a schematic diagram of the structure of the scraping mechanism of the present invention.

[0017] In the figure: 1, base; 2, guide rod; 3, connecting plate; 4, hydraulic telescopic machine; 5, coating mechanism; 501, pushing 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, guiding block; 7, scraping mechanism; 701, scraper; 702, limiting plate; 703, scraping rod; 704, deflecting plate; 705, rotating rod; 706, driving gear; 707, linkage gear; 8, support mechanism; 801, support table; 802, fixing plate; 803, fixing block; 804, connecting block; 805, sliding rod; 806, sliding block; 807, compression spring; 9, screen printing plate. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0018] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative work shall fall within the protection scope of the present invention.

[0019] Please refer to Figures 1 to 8 , the present invention provides a technical solution: a device for uniformly coating the grain boundary diffusion of a rare earth permanent magnet, including a base 1, a guide rod 2 is fixedly installed on the top of the base 1, the right side of the base 1 near the bottom is fixedly connected to the left side of a connecting plate 3, a hydraulic telescopic machine 4 is fixedly installed on the top of the connecting plate 3, the output end of the hydraulic telescopic machine 4 is fixedly connected to the bottom of a coating mechanism 5, a screen printing plate 9 is installed on the inner wall of the coating mechanism 5, 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 a feeding mechanism 6, the inner wall of the coating mechanism 5 is slidably connected to the outer wall of a 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 a support mechanism 8.

[0020] In this embodiment, as Figures 1 to 8 shown, a telescopic groove is opened inside the base 1, and a sliding groove for the support mechanism 8 to slide is opened on the inner bottom wall of the telescopic groove.

[0021] In this embodiment, as Figures 1 to 8 shown, the coating mechanism 5 includes 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 opened on the inner wall of the coating table 502, and a recovery groove communicating with the recovery bin 504 is opened on one side of the coating groove. The inner bottom wall of the recovery groove is fixedly connected to the bottom of the wedge block 503, and the recovery bin 504 is installed on the left side of the coating table 502 through bolts. A moving port for the scraping mechanism 7 to slide is opened on the inner wall of the coating groove, 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 end of the linkage rack 506, and the outer wall of the linkage rack 506 is meshed with the outer wall of the scraping mechanism 7, and the feeding mechanism 6 is fixedly installed on the top of the coating table 502, and plugging holes for the guide rod 2 to slide and insert are opened at the four corners of the coating table 502. The hydraulic telescopic machine 4 drives the coating table 502 to move downward through the push plate 501, and when the coating table 502 moves downward, it will drive the linkage rack 506 to move downward.

[0022] In this embodiment, as Figures 1 to 8As shown in the figure, the feeding mechanism 6 includes a feeding bin 601, a feeding pipe 602, a sealing cover 603 and a guiding block 604. The bottom of the feeding bin 601 is fixedly connected to the top of the coating table 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 guiding block 604. Ink is injected into the coating table 502 through the feeding pipe 602 and stays on the screen printing plate 9. By covering the sealing cover 603 on the feeding pipe 602, dust or other sundries can be prevented from entering the coating table 502.

[0023] In this embodiment, as Figures 1 to 8 shown, the scraping mechanism 7 includes a scraper 701, a limiting plate 702, a scraping rod 703, a deflecting plate 704, a rotating rod 705, a transmission gear 706 and a linkage gear 707. The bottom of the scraper 701 is movably abutted against the top of the screen printing plate 9, and a limiting plate 702 is arranged 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 groove, and the outer wall of the scraper 701 near the top is fixedly connected to one end of the scraping rod 703. The outer wall of the scraping rod 703 is slidably abutted against the inner wall of the deflecting plate 704, and the inner wall of the deflecting plate 704 on the side away from the scraping rod 703 is snap-connected to the inner wall of the rotating rod 705. The outer wall of the rotating rod 705 is snap-connected to 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, and a rotating cavity for the rotation of the linkage gear 707 and the transmission gear 706 is provided inside the base 1. 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 deflecting plate 704 to rotate. When the deflecting plate 704 deflects, it can drive the scraping rod 703 to slide inside the deflecting plate 704. The scraping rod 703 moves horizontally in the moving port under the limiting action of the moving port. The scraping rod 703 drives the scraper 701 to move horizontally. Under the limiting action of the limiting plate 702, the scraper 701 can be prevented from shifting. The scraper 701 evenly presses the ink into the screen printing plate 9. The excess ink is pushed by the scraper 701 onto the wedge-shaped block 503, and the ink flows along the wedge-shaped block 503 into the recovery bin 504 under the action of gravity.

[0024] In this embodiment, as Figures 1 to 8As shown, the support mechanism 8 includes a support platform 801, a fixing plate 802, a fixing block 803, an adapter block 804, a sliding rod 805, a sliding block 806 and a compression spring 807. Fixing plates 802 are fixedly installed on both sides of the support platform 801, and a fixing block 803 is fixedly installed at the bottom of the support platform 801. The outer wall of the fixing block 803 is rotatably connected to the adapter block 804, and the inner wall of the side of the adapter block 804 away from the fixing block 803 is rotatably connected to the outer wall of the sliding rod 805. The outer wall of the end of the sliding rod 805 away from the adapter block 804 is snap-fitted 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. 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 support groove for the fixing plate 802 to abut and support is provided at the top of the base 1, and a clamping groove for fixing and limiting the workpiece is provided at the top of the support platform 801. The support platform 801 drives the fixing plate 802 to move downward and abut against the support groove. When the support platform 801 moves downward, it will drive the fixing block 803 to move downward. The fixing block 803 drives the adapter block 804 to move downward. The adapter 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 in the screen printing plate 9 is coated on the top of the workpiece. Reverse-start the hydraulic telescopic machine 4. After the coating table 502 driven by the hydraulic telescopic machine 4 returns to its original position and the coating table 502 disengages from the top of the workpiece, under the telescopic force of the compression spring 807, the sliding block 806 returns to its original position. The sliding block 806 lifts the support platform 801 from the support groove through the adapter block 804.

[0025] In this embodiment, as Figures 1 to 8 shown, the coating groove is a through port penetrating the coating table 502, and the inner wall of the coating groove near the bottom is snap-fitted with the outer wall of the screen printing plate 9. A limiting groove for the limiting plate 702 to slide is provided below the coating groove near the moving port. The scraping rod 703 drives the scraper 701 to move horizontally. Under the limiting action of the limiting plate 702, the scraper 701 can be prevented from shifting.

[0026] In this embodiment, as Figures 1 to 8 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 groove.

[0027] The usage method and advantages of the present invention: When this rare earth permanent magnet grain boundary diffusion uniform coating device is working, the working process is as follows: As Figures 1 to 8As shown, 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 downward through the push plate 501. When the coating table 502 moves downward, it will drive the linkage rack 506 to move downward. 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 deflecting plate 704 to rotate. When the deflecting plate 704 deflects, it can drive the scraping rod 703 to slide in the deflecting plate 704. The scraping rod 703 moves horizontally in the moving port under the limiting action of the moving port. The scraping rod 703 drives the squeegee 701 to move horizontally. Under the limiting action of the limiting plate 702, the squeegee 701 can be prevented from shifting. The squeegee 701 evenly presses the ink into the screen printing plate 9. The excess ink is pushed by the squeegee 701 onto the wedge block 503. Under the action of gravity, the ink flows along the wedge block 503 into the recovery bin 504; The workpiece to be processed is fixed in the card slot opened on the support table 801. The hydraulic telescopic machine 4 drives the coating table 502 to move downward. Under the guiding action of the guiding rod 2, the coating table 502 can move downward along the guiding rod 2 and make the bottom of the coating table 502 abut against the top of the base 1. After the coating table 502 abuts against the base 1, it will drive the screen printing plate 9 to abut against the top of the workpiece, making the support table 801 drive the fixing plate 802 to move downward and abut against the support groove. When the support table 801 moves downward, it will drive the fixing block 803 to move downward. The fixing 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 in the screen printing plate 9 is coated on the top of the workpiece. The hydraulic telescopic machine 4 is started in reverse. The hydraulic telescopic machine 4 drives the coating table 502 to reset. After the coating table 502 disengages from the top of the workpiece, under the telescopic action of the compression spring 807, the sliding block 806 resets. The sliding block 806 lifts the support table 801 out of the support groove through the connecting block 804.

[0028] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art of this industry should understand that the present invention is not limited by the above embodiments. The above embodiments and the descriptions in the specification are only preferred examples of the present invention and are not used to limit the present invention. Without departing from the spirit and scope of the present invention, the present invention will have various changes and improvements, and these changes and improvements all fall within the scope of the present invention claimed. The scope of protection claimed by the present invention is defined by the appended claims and their equivalents.

Claims

1. A device for uniformly coating the grain boundaries of a rare earth permanent magnet by diffusion, comprising a base (1). A guide rod (2) is fixedly installed at the top of the base (1). The right side of the base (1) near the bottom is fixedly connected to the left side of a connecting plate (3). A hydraulic telescopic machine (4) is fixedly installed at 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). A screen printing plate (9) is installed on the inner wall of the coating mechanism (5). 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). The inner bottom wall of the base (1) is slidably connected to the outer wall of the support mechanism (8).

2. The grain boundary diffusion uniform coating device for a rare earth permanent magnet according to claim 1, wherein: A telescopic groove is formed inside the base (1), and a sliding groove for the support mechanism (8) to slide is formed on the inner bottom wall of the telescopic groove.

3. A rare earth permanent magnet grain boundary diffusion uniform coating device according to claim 1, characterized in that: The coating mechanism (5) includes 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 near the top of the coating table (502). A coating groove is formed in the inner wall of the coating table (502), and a recovery groove communicating with the recovery bin (504) is formed on one side of the coating groove. The bottom of the wedge block (503) is fixedly connected to the inner bottom wall of the recovery groove, and the recovery bin (504) is installed on the left side of the coating table (502) by bolts. A moving port for the scraping mechanism (7) to slide is formed in the inner wall of the coating groove, and the right side near the bottom of the coating table (502) 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 end of the linkage rack (506), and the outer wall of the linkage rack (506) is meshed with the outer wall of the scraping mechanism (7). The feeding mechanism (6) is fixedly installed on the top of the coating table (502), and plug holes for the guide rod (2) to slide and insert are formed at the four corners of the coating table (502).

4. A grain boundary diffusion uniform coating device for rare earth permanent magnets according to claim 3, characterized in that: The feeding mechanism (6) includes a feeding bin (601), a feeding pipe (602), a sealing cover (603), and a guiding block (604). The bottom of the feeding bin (601) is fixedly connected to the top of the coating table (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-fitted with 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 guiding block (604).

5. A rare earth permanent magnet grain boundary diffusion uniform coating device according to claim 3, characterized in that: The doctor blade mechanism (7) includes a doctor blade (701), a limit 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 doctor blade (701) is movably abutted against the top of the screen printing plate (9), and a limit plate (702) is arranged on the outer wall of the doctor blade (701) near the middle. The outer wall of the limit plate (702) is slidably connected to the inner wall of the coating groove, and one end of a scraping rod (703) is fixedly connected to the outer wall of the doctor blade (701) near the top. The outer wall of the scraping rod (703) is slidably abutted against the inner wall of the deflection plate (704), and the inner wall of the deflection plate (704) on the side away from the scraping rod (703) is snap-connected to the inner wall of the rotating rod (705). The outer wall of the rotating rod (705) is snap-connected to 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), and a rotating cavity for the rotation of the linkage gear (707) and the transmission gear (706) is opened inside the base (1).

6. The grain boundary diffusion uniform coating device for a rare earth permanent magnet according to claim 2, characterized in that: The support mechanism (8) includes a support table (801), a fixing plate (802), a fixing block (803), an adapter block (804), a sliding rod (805), a sliding block (806) and a compression spring (807). Fixing plates (802) are fixedly installed on both sides of the support table (801), and a fixing block (803) is fixedly installed at the bottom of the support table (801). The outer wall of the fixing block (803) is rotatably connected to an adapter block (804), and the inner wall of the adapter block (804) on the side away from the fixing block (803) is rotatably connected to the outer wall of a sliding rod (805). The outer wall of the sliding rod (805) at the end away from the adapter block (804) is snap-connected to the inner wall of the sliding block (806), and one end of the compression spring (807) is fixedly connected to the outer wall of the sliding block (806). 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 support groove for the fixing plate (802) to abut and support is opened at the top of the base (1), and a clamping groove for fixing and limiting the workpiece is opened at the top of the support table (801).

7. A grain boundary diffusion uniform coating device for rare earth permanent magnets according to claim 3, characterized in that: The coating groove is a through port penetrating the coating table (502), and the inner wall of the coating groove near the bottom is snap-connected to the outer wall of the screen printing plate (9). A limit groove for the sliding of the limit plate (702) is opened below the coating groove near the moving port.

8. A grain boundary diffusion uniform coating device for rare earth permanent magnets according to claim 3, characterized in that: The inner wall of the moving port is slidably connected to the outer wall of the scraping rod (703), and the doctor blade (701) is arranged inside the coating groove.

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