Neodymium iron boron diffusion mixing device and grain boundary diffusion preparation method

Abstract

The invention relates to the technical field of neodymium iron boron diffusion, in particular to a neodymium iron boron diffusion mixing device and a grain boundary diffusion preparation method. Comprising a fixed frame and a material mixing frame in sliding fit with the fixed frame, the mixing frame adopts a double-layer latticed structure, and the mixing tank is fixed in the lattices; a driving device is arranged at the bottom of the fixed frame and is used for driving the mixing frame to slide up and down along the fixed frame for mixing; a sliding shaft is arranged on the side surface of the mixing frame; sliding sleeves are installed on the two sides of the fixing frame through sliding connecting plates, and the sliding shafts are arranged in the sliding sleeves on the two sides in a matched mode. The driving device comprises a driving motor and a floating mechanism connected with the driving device, and the driving motor drives the floating mechanism to drive the mixing frame to slide up and down along the fixing frame for mixing; the driving motor is in sliding fit with the bottom of the fixing frame; during shutdown, the driving motor is separated from the driving device floating mechanism; the technical problem of how to realize automatic mixing of canned neodymium iron boron and heavy rare earth raw materials is solved.

Description

TECHNICAL FIELD

[0001] The present application relates to a neodymium iron boron diffusion technology, in particular to a neodymium iron boron diffusion mixing device and a grain boundary diffusion preparation method. BACKGROUND

[0002] The main working process of the current boundary diffusion is that the diffusion workshop adds a fixed proportion of heavy rare earth raw materials to the neodymium iron boron product according to the customer's technical requirement index; the product with added heavy rare earth is loaded into a high vacuum sintering furnace to complete the grain boundary diffusion process; and the heavy rare earth elements attached to the surface of the sintered neodymium iron boron magnet are diffused into the inside of the sintered neodymium iron boron magnet along the molten grain boundary through a heat treatment process.

[0003] In the mixing process of heavy rare earth raw materials and neodymium iron boron, the current method is to hold the materials in both hands and mix them by shaking up and down.

[0004] A sintered neodymium iron boron grain boundary diffusion tool is disclosed in a Chinese patent with the authorization announcement number CN218849266U, which automatically mixes the neodymium iron boron and the heavy rare earth elements as a whole through the support groove; and the mixing effect is improved by loading a certain amount of neodymium iron boron and a certain amount of heavy rare earth elements into the mixing tank for mixing. However, the above-mentioned device cannot automatically mix the tank-loaded neodymium iron boron and heavy rare earth raw materials.

[0005] Therefore, the existing problem is how to automatically mix the tank-loaded neodymium iron boron and heavy rare earth raw materials. SUMMARY

[0006] The present application provides a neodymium iron boron diffusion mixing device and a grain boundary diffusion preparation method, which aims to solve the problem of automatically mixing the tank-loaded neodymium iron boron and heavy rare earth raw materials.

[0007] The technical scheme used in the present application is as follows: The first aspect of the present application proposes a neodymium iron boron diffusion mixing device, which comprises a fixed frame and a mixing frame slidingly fitted in the fixed frame; the mixing frame adopts a double-layer grid structure, and the grid is used to fix a mixing tank; the bottom of the fixed frame is provided with a driving device, which is used to drive the mixing frame to slide up and down along the fixed frame for mixing; the side of the mixing frame is provided with a sliding shaft; the two sides of the fixed frame are installed with sliding sleeves through sliding connecting plates; the sliding shaft is fitted in the sliding sleeves on both sides; the driving device comprises a driving motor and a floating mechanism connected with the driving device, and the driving motor drives the floating mechanism to drive the mixing frame to slide up and down along the fixed frame for mixing; the driving motor is slidingly fitted with the bottom of the fixed frame; when the machine is stopped, the driving motor is separated from the floating mechanism of the driving device.

[0008] Further, the floating mechanism comprises a circular rotating plate, one side center of the circular rotating plate is welded with a driving shaft, the driving shaft is fixedly connected with an output shaft of a driving motor through a shaft coupling, the other end of the rotating plate is fixedly connected with an eccentric shaft, and the eccentric shaft is located at a non-center position of the rotating plate; the bottom of the mixing frame is provided with a swing plate, two swing ears are oppositely arranged on the swing plate, and a swing sliding shaft is horizontally welded between the swing ears; one end of the supporting arm is rotationally connected with the eccentric shaft through a rotating sleeve, and the other end of the supporting arm is slidably connected with the swing sliding shaft through a sliding ring.

[0009] Further, the rotating plate and the eccentric shaft are connected through insertion, the rotating plate is provided with an insertion shaft with a non-circular cross section, and the end of the eccentric shaft is provided with an insertion groove corresponding to the insertion shaft, and the insertion shaft can be inserted into the insertion groove.

[0010] Further, the bottom of the fixed frame is oppositely provided with two motor sliding shafts, the driving motor is fixedly arranged on the upper side of a motor sliding plate, the lower side of the motor sliding plate is slidably connected with the motor sliding shafts through sliding sleeves, and the bottom of the fixed frame is provided with a motor push rod; the bottom of the fixed frame is provided with an n-shaped supporting beam frame, a supporting beam column is slidably arranged on the supporting beam frame, and the upper side of the supporting beam column is provided with a supporting pad plate; the lower side of the supporting beam column is provided with a supporting roller; the bottom of the fixed frame is oppositely provided with push block sliding shafts, a supporting push block is slidably arranged on the push block sliding shafts, and the upper surface of the supporting push block is in the shape of a broken line with parallel ends; the lower end of the supporting beam column is provided with a beam column limiting plate, and a beam column spring is arranged on the supporting beam column; the lower side of the motor sliding plate is provided with a sliding plate sleeve ring, a clutch driving shaft is slidably arranged on the sliding plate sleeve ring; the push head of the motor push rod penetrates through the fixed frame and is fixed to one end of the clutch driving shaft, the other end of the clutch driving shaft penetrates through the sliding plate sleeve ring and is fixed to a first clutch driving plate, and the shaft body of the clutch driving shaft is provided with a second clutch driving plate; a clutch driving spring is arranged on the clutch driving shaft and clamped between the second clutch driving plate and the sliding plate sleeve ring; the first clutch driving plate is provided with a supporting push frame, and the two ends of the supporting push frame are fixed to the side portions of the supporting push block, respectively.

[0011] Further, the grid of the mixing frame is provided with a semi-circular tank fixing plate fixed through floating springs, the upper surface of the tank fixing plate is inlaid with two arc-shaped magnets, and the arc-shaped magnets are used for adsorbing the mixing tank in the tank fixing plate.

[0012] Further, the side of the fixed frame is provided with a horizontal moving mechanism, the upper side of the horizontal moving mechanism is provided with a discharging mechanical arm, the execution end of the discharging mechanical arm is provided with a discharging clamping mechanism, and the discharging clamping mechanism is used for taking out the completed mixing tank in a row; the mixing tank comprises a cylindrical tank body, and the tank body is made of metal; the bottom of the tank body is provided with an opening, the upper end of the tank body is slidably provided with a tank shaft, and the lower side of the tank shaft is provided with a cover; the cover comprises a conical portion and a cylindrical portion, the cylindrical portion is used for closing the opening of the bottom of the tank body, and the conical portion is used for guiding material when the cover is opened; the upper side of the tank shaft extends out of the tank body and is fixed to an opening plate, a tank spring is arranged on the tank shaft between the opening plate and the tank body.

[0013] Further, the unloading clamping mechanism comprises a clamping base with an n-shaped cross section and an arc-shaped electromagnet arranged on the lower side of the clamping base, and the arc-shaped electromagnet is used for adsorbing the upper surface of the mixing tank; the lower surface of the clamping base is provided with a control base plate, and the upper side of the clamping base is provided with a connecting base plate, and the execution end of the unloading mechanical arm is rigidly connected with the connecting base plate; the control base plate is sequentially provided with a tank cylinder and a separation cylinder, the push head of the tank cylinder is fixed with a tank push plate through the control base plate, and the tank push plate is used for pushing the end of the mixing tank to open the tank; the push head of the separation cylinder is fixed with a separation push plate through the control base plate.

[0014] Further, the two sides of the clamping base are provided with anti-sticking units, the anti-sticking units are connected with the execution end of the unloading mechanical arm through switching units, and the anti-sticking units are used for generating oscillation on the clamping base; the switching units are used for rigid-flexible switching; the anti-sticking unit comprises an anti-sticking base frame with an n-shaped cross section and a rotating base plate fixed with the anti-sticking base frame, and the rotating base plate has an O-shaped cross section; a reciprocating driven shaft is slidingly fitted on the anti-sticking base frame, one side of the reciprocating driven shaft is fixed with the side of the clamping base, the other end of the reciprocating driven shaft is fixed with a reciprocating limiting plate through the anti-sticking base frame, and a reciprocating spring is arranged on the reciprocating driven shaft between the anti-sticking base frame and the reciprocating limiting plate; the two sides of the rotating base plate are provided with conversion fixed plates, a rotating shaft is arranged on one side of the rotating base plate, and the rotating shaft is rotatably fitted with the conversion fixed plate with an L-shaped cross section through a bearing; the other side of the conversion fixed plate is provided with an anti-sticking driving motor and a conversion cylinder, the push head of the conversion cylinder is fixed with a conversion pressing frame with an L-shaped cross section through the conversion fixed plate, and the conversion pressing frame is used for pressing on the side of the rotating base plate to limit the rotation of the rotating base plate; a reciprocating driving shaft is rotatably fitted on the rotating base plate corresponding to the side of the anti-sticking driving motor, and the motor shaft of the anti-sticking driving motor is fixed with one end of the reciprocating driving shaft through a shaft coupling; the other end of the reciprocating driving shaft is fixed with a driving ring, the end of the driving ring is provided with a driving groove with a semicircular cross section in correspondence, and swing clamping columns are arranged between the reciprocating limiting plates corresponding to the side of the driving ring, and the swing clamping columns are clamped in the driving groove; a ratchet gear is keyed on the reciprocating driving shaft, and a ratchet clamping is rotatably fitted on the rotating base plate through a torsion spring, and the ratchet clamping is pressed on the ratchet gear; the reciprocating driving shaft rotates to drive the ratchet gear to rotate.

[0015] Further, the switching unit comprises a switching rack, the middle of the switching rack is fixed with the execution end of the unloading mechanical arm, the two sides of the switching rack are provided with cylinder ears, the cylinder ears are provided with switching cylinders, and the push head of the switching cylinder is fixed with a switching pressing plate through the cylinder ear; the other side of the switching pressing plate has a ring; the upper side of the conversion fixed plate is provided with a conical convex, and the upper side of the conical convex is connected with the cylinder ear through a switching rope; the switching rope passes through the ring; when the displacement, the switching cylinder drives the switching pressing plate to be pressed on the upper side of the conversion fixed plate to form a rigid support, and when the vibration is discharged, the switching cylinder drives the switching pressing plate to be withdrawn, and the switching rope forms a flexible connection.

[0016] The second aspect of this application discloses a method for preparing grain boundary diffusion, comprising the following steps: Step 1: Cut the prepared NdFeB blank into finished NdFeB products of the specified dimensions. Step 2: Using the NdFeB diffusion mixing device described above, NdFeB products of finished specifications and sizes are coated with a fixed proportion of heavy rare earth raw materials to obtain products with added heavy rare earth. Step 3: The product with added heavy rare earth elements is loaded into a high vacuum sintering furnace for grain boundary diffusion treatment.

[0017] The beneficial effects achieved by this invention are as follows: When the device stops, the control motor push rod retracts, the support push frame drives the support push block to slide along the push block slide shaft, the support roller rises along the folded surface, overcomes the pressure of the beam column spring to push the support beam column upward, so that the support pad plate contacts the bottom surface of the mixing rack and provides support force, transferring the weight of the mixing rack to the support beam frame structure; then the motor push rod continues to retract, the first clutch drive plate contacts the slide plate collar, the first clutch drive plate drives the motor slide plate to move backward along the motor slide shaft through the slide plate collar, so that the insertion shaft of the rotating plate gradually disengages from the insertion slot of the eccentric shaft until it is completely separated; thus eliminating the axial pressure on the motor bearing when the device stops. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the integral NdFeB diffusion mixing device of the present invention.

[0019] Figure 2 This is a schematic diagram of the sliding shaft and sliding sleeve connection structure of the present invention.

[0020] Figure 3 This is a schematic diagram of the drive device structure of the present invention.

[0021] Figure 4 This is a schematic diagram of the floating mechanism structure of the present invention.

[0022] Figure 5 This is a schematic diagram of the plug shaft and plug slot structure of the present invention.

[0023] Figure 6 This is a schematic diagram of the sliding structure of the drive motor of the present invention. Figure 1 .

[0024] Figure 7 This is a schematic diagram of the sliding structure of the drive motor of the present invention. Figure 2 .

[0025] Figure 8 This is a schematic diagram of the cooperation between the slide collar and the clutch drive shaft of the present invention.

[0026] Figure 9This is a schematic diagram of the sliding engagement process of the drive motor of the present invention.

[0027] Figure 10 This is a schematic diagram of the tank fixing plate structure of the present invention.

[0028] Figure 11 This is a schematic diagram of the position of the transverse movement mechanism of the present invention.

[0029] Figure 12 This is a schematic diagram of the unloading clamping mechanism of the present invention.

[0030] Figure 13 This is a schematic diagram of the mixing rack and separating shaft of the present invention.

[0031] Figure 14 This is a schematic diagram of the cross-sectional structure of the guide block of the present invention.

[0032] Figure 15 This is a schematic diagram of the operation of the tank fixing plate of the present invention.

[0033] Figure 16 This is a schematic diagram of the switching unit structure of the present invention. Figure 1 .

[0034] Figure 17 This is a schematic diagram of the switching unit structure of the present invention. Figure 2 .

[0035] Figure 18 This is a schematic diagram of the anti-sticking unit structure of the present invention. Figure 1 .

[0036] Figure 19 This is a schematic diagram of the anti-sticking unit structure of the present invention. Figure 2 .

[0037] Figure 20 This is a schematic diagram of the anti-sticking unit structure of the present invention. Figure 3 .

[0038] In the diagram, 1. Fixed frame; 2. Mixing rack; 3. Connecting plate; 4. Sliding shaft; 5. Fixed lug; 6. Mounting beam; 7. Sliding connecting plate; 8. Sliding sleeve; 9. Drive motor; 10. Motor crossbeam; 11. Motor support; 12. Rotating plate; 13. Drive shaft; 14. Eccentric shaft; 15. Swing plate; 16. Swing lug; 17. Swing sliding shaft; 18. Support arm; 19. Rotating sleeve; 20. Sliding ring; 21. Insertion shaft; 22. Insertion slot; 23. Motor sliding shaft; 24. 25. Motor slide plate; 26. Motor push rod; 27. Support beam frame; 28. Support beam column; 29. ​​Support pad; 30. Support roller; 31. Push block slide shaft; 32. Support push block; 33. Beam column limiting plate; 34. Beam column spring; 35. Slide plate collar; 36. Clutch drive shaft; 37. First clutch drive plate; 38. Second clutch drive plate; 39. Clutch drive spring; 40. Support push frame; 41. Floating spring; 42. Tank fixing plate; 43. Arc magnet; 44. Horizontal 44. Transfer mechanism; 45. Unloading robotic arm; 46. Clamping base; 47. Arc-shaped electromagnet; 48. Control board; 49. Connecting board; 50. Tank cylinder; 51. Tank push plate; 52. Separation cylinder; 53. Separation push plate; 54. Tank body; 55. Tank shaft; 56. Cover; 57. Opening plate; 58. Tank spring; 59. Separation shaft; 60. Separation driven plate; 61. Separation connecting plate; 62. Guide block; 63. Guide channel; 64. Separation rope; 65. Anti-stick base 65. Rotating base plate; 66. Reciprocating driven shaft; 67. Reciprocating limit plate; 68. Reciprocating spring; 69. Conversion fixing plate; 70. Rotating shaft; 71. Anti-stick drive motor; 72. Conversion cylinder; 73. Conversion pressure frame; 74. Reciprocating drive shaft; 75. Drive ring sleeve; 76. Drive groove; 77. Swinging pin; 78. Racket gear; 79. Racket lock; 80. Switching frame; 81. Switching cylinder; 82. Switching pressure plate; 83. Conical protrusion; 84. Switching rope. Detailed Implementation

[0039] To facilitate understanding of the present invention by those skilled in the art, specific embodiments of the present invention will be described below with reference to the accompanying drawings.

[0040] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. For those skilled in the art, the specific meaning of the above terms in this invention can be understood through the specific circumstances.

[0041] like Figures 1-2As shown, the present invention provides a neodymium iron boron diffusion mixing device, including a fixed frame 1 and a mixing rack 2 slidably fitted within the fixed frame 1; the fixed frame 1 serves as the supporting base of the entire device and has a rectangular frame structure; the mixing rack 2 adopts a double-layer grid structure with seven rows and seven columns, totaling 49 grids; the grid is used to snap the mixing tanks together, and one snap-fit ​​can simultaneously mix the neodymium iron boron and heavy rare earth raw materials in the 49 mixing tanks; the two layers of mixing rack 2 are fixedly welded together by four connecting plates 3; a driving device is provided at the bottom of the fixed frame 1, which is used to drive the mixing rack 2 to slide up and down along the fixed frame 1 for mixing; the sides of the connecting plates 3 are fixedly welded with sliding shafts 4 by fixing ears 5; the fixed frame 1 has vertical mounting beams 6 on both sides, and the mounting beams 6 are fixed to the fixed frame 1 with sliding connecting plates 7 (welded or bolted together), and sliding sleeves 8 are installed on the sliding connecting plates 7, with the sliding shafts 4 fitting into the sliding sleeves 8 on both sides.

[0042] In the NdFeB diffusion mixing device, when the drive device is started, the power it generates is transmitted to the mixing frame 2, which drives the mixing frame 2 to slide up and down along the vertical direction of the fixed frame 1. The mixing tanks that are locked in the grid of the mixing frame 2 move synchronously with the mixing frame 2. During the up and down sliding process, the NdFeB and heavy rare earth raw materials in the tanks generate relative motion due to inertia and displacement changes, thereby realizing the mixing of raw materials. The double-layer grid structure design realizes the synchronous installation and mixing of 49 mixing tanks.

[0043] like Figures 3-4 As shown, the drive device is located at the bottom of the fixed frame 1. The drive device includes a drive motor 9 and a floating mechanism connected to the drive device. Two motor beams 10 are provided opposite each other at the bottom of the fixed frame 1. The drive motor 9 is welded and fixed to the motor beams 10 through a motor support 11, and its output shaft extends horizontally. The floating mechanism includes a circular rotating plate 12. A drive shaft 13 is welded to the center of one side of the circular rotating plate 12. The drive shaft 13 is fixedly connected to the output shaft of the drive motor 9 through a coupling. The other end of the rotating plate 12 is welded and fixed to an eccentric shaft 14. The eccentric shaft 14 is located at the non-center of the rotating plate 12. A swing plate 15 is provided at the bottom of the mixing rack 2. Two swing ears 16 are provided opposite each other on the swing plate 15. A swing sliding shaft 17 is horizontally welded between the swing ears 16. One end of the support arm 18 is rotatably engaged with the eccentric shaft 14 through a rotating sleeve 19. The eccentric shaft 14 has a limiting structure to limit the rotating sleeve 19. The other end of the support arm 18 is slidably engaged with the swing sliding shaft 17 through a sliding ring 20.

[0044] The drive motor 9 drives the circular rotating plate 12 to rotate around the central axis of the drive shaft 13; the eccentric shaft 14 at the other end of the rotating plate 12 moves in a circular motion with the rotating plate 12, and the sliding ring 20 slides back and forth on the swing sliding shaft 17, while pushing the mixing rack 2 to slide back and forth vertically along the fixed frame 1; the back and forth sliding generated by the eccentric drive makes the 49 mixing tanks move up and down in a regular manner in sync, and the raw materials in the tanks fall, collide and convection due to inertia, which promotes the full mixing of neodymium iron boron and heavy rare earth raw materials.

[0045] Considering that the mixing rack 2 still exerts pressure on the motor shaft of the drive motor 9 when the device is not in use; to solve this problem, such as Figure 5 As shown, the rotating plate 12 and the eccentric shaft 14 are connected by a plug-in joint. The rotating plate 12 is provided with a plug-in shaft 21 with a non-circular cross-section. Taking a hexagonal shape as an example, the end of the eccentric shaft 14 is provided with a plug-in groove 22 corresponding to the plug-in shaft 21. The plug-in shaft 21 can fit into the plug-in groove 22. The end of the plug-in shaft 21 is provided with a magnet. Figures 6-7 As shown, the drive motor 9 and the bottom of the fixed frame 1 are connected by a sliding fit; two motor sliding shafts 23 are provided opposite each other at the bottom of the fixed frame 1, the drive motor 9 is fixed to the upper side of the motor slide plate 24 by the motor support 11, the lower side of the motor slide plate 24 is connected to the motor sliding shafts 23 by a sliding sleeve, and the bottom of the fixed frame 1 is provided with a motor push rod 25; the bottom of the fixed frame 1 is provided with an n-shaped cross-section support beam frame 26, and a rectangular cross-section support beam column 27 is slidably fitted on the support beam frame 26. A support pad 28 is provided on the upper side of the support beam column 27, and the support pad 28 is used to adjust the mixing when the machine is stopped. The material rack 2 provides support; support rollers 29 are provided on the lower side of the support beam 27; push block sliding shafts 30 are provided on opposite sides of the bottom of the fixed frame 1, and support push blocks 31 are slidably fitted on the push block sliding shafts 30. The upper surface of the support push blocks 31 is a zigzag shape with parallel ends; a beam column limiting plate 32 is provided at the lower end of the support beam 27, and a beam column spring 33 passes through the support beam 27. The beam column spring 33 is locked between the beam column limiting plate 32 and the support beam frame 26; the beam column spring 33 is in a compressed state, and the beam column spring 33 is used to force the support rollers 29 to contact the upper surface of the support push blocks 31; Figure 8 As shown; a slide collar 34 is provided on the lower side of the motor slide 24, and a clutch drive shaft 35 is slidably fitted on the slide collar 34; the push head of the motor push rod 25 passes through the fixing frame 1 and is fixed to one end of the clutch drive shaft 35, and the other end of the clutch drive shaft 35 passes through the slide collar 34 and is fixed to the first clutch drive plate 36; a second clutch drive plate 37 is provided on the shaft of the clutch drive shaft 35; a clutch drive spring 38 passes through the clutch drive shaft 35, and the clutch drive spring 38 is stuck between the second clutch drive plate 37 and the slide collar 34; an n-shaped cross-section support pusher 39 is welded and fixed on the first clutch drive plate 36, and the two ends of the support pusher 39 are respectively fixed to the side of the support pusher block 31.

[0046] like Figure 9 As shown; during use, the motor push rod 25 extends, the second clutch drive plate 37 drives the clutch drive spring 38 to move laterally, and the clutch drive spring 38 pushes the slide collar 34 to force the motor slide plate 24 to move; the plug shaft 21 is inserted into the plug slot 22 to realize power transmission; the first clutch drive plate 36 drives the support push block 31 to slide through the support push frame 39. During the process of the plug shaft 21 being inserted into the plug slot 22, the first section of the plane of the support push block 31 provides support for the support roller 29, and the support pad 28 contacts the bottom surface of the mixing rack 2 and provides support. Support force; then the motor push rod 25 continues to extend, the clutch drive shaft 35 slides relative to the slide collar 34, the second clutch drive plate 37 squeezes the clutch drive spring 38; the support push frame 39 pushes the support push block 31 to slide along the push block slide shaft 30; under the pressure of the beam column spring 33, the support roller 29 closely fits the second section plane of the support push block 31, the support pad 28 is lower than the bottom surface of the mixing rack 2 and does not bear the support function; the mixing rack 2 can slide up and down in the vertical direction along the fixed frame 1 to mix materials.

[0047] When the device stops, the control motor push rod 25 retracts, the support push frame 39 drives the support push block 31 to slide along the push block slide shaft 30, and the support roller 29 rises along the folded surface, overcoming the pressure of the beam column spring 33 and pushing the support beam column 27 upward, so that the support pad 28 contacts the bottom surface of the mixing rack 2 and provides support force, transferring the weight of the mixing rack 2 to the support beam frame 26 structure; then the motor push rod 25 continues to retract, the first clutch drive plate 36 contacts the slide plate collar 34, the first clutch drive plate 36 drives the motor slide plate 24 to move backward along the motor slide shaft 23 through the slide plate collar 34, so that the insertion shaft 21 of the rotating plate 12 gradually disengages from the insertion slot 22 of the eccentric shaft 14 until it is completely separated; thus eliminating the axial pressure on the motor bearing when the device stops. The combination design of the non-circular plug shaft 21 and the magnet ensures stable power transmission while enabling rapid clutch engagement. The sliding cooperation between the motor slide plate 24 and the motor slide shaft 23, combined with the linkage mechanism of the clutch drive shaft 35 and the clutch drive spring 38, ensures the separation of the drive motor 9 from the eccentric shaft 14 when the machine stops. The folded surface of the support push block 31, in cooperation with the support roller 29 and the beam column spring 33, can bear the weight of the mixing rack 2 when the machine stops without additional control. This effectively avoids the drive motor 9 shaft system from bearing static loads for a long time, improving the mechanical life and operational reliability of the equipment.

[0048] To further enhance the mixing effect when the mixing rack 2 moves up and down, such as Figure 10As shown, a semi-circular cross-section tank fixing plate 41 is fixed within the grid of the mixing rack 2 by a floating spring 40. Two arc-shaped magnets 42 are embedded on the upper surface of the tank fixing plate 41. The arc-shaped magnets 42 are used to attract the mixing tank into the tank fixing plate 41. The two arc-shaped magnets 42 on the upper surface of the tank fixing plate 41 use magnetic attraction force to stably fix the mixing tank in the fixing plate. When the mixing rack 2 moves up and down, the floating spring 40 is periodically compressed and stretched with the movement of the mixing rack 2, which drives the tank fixing plate 41 and the mixing tank to not only reciprocate as a whole in the vertical direction, but also generate high-frequency micro-amplitude vibration based on the elastic deformation of the spring. Through the above structural design, the elastic support characteristics of the floating spring 40 enable the mixing tank to form a composite motion mode of "rigid adsorption + elastic floating" in the reciprocating motion. The floating spring 40 transforms the linear motion of the mixing rack 2 into multi-dimensional vibration of the tank, increasing the mixing effect of the material in the tank.

[0049] like Figure 11 As shown, the side of the fixed frame 1 is provided with a transverse movement mechanism 43. The transverse movement mechanism 43 can be an existing belt slide rail type transverse movement mechanism or a railcar type transverse movement mechanism. The upper side of the transverse movement mechanism 43 is provided with a unloading robotic arm 44. The execution end of the unloading robotic arm 44 is provided with an unloading clamping mechanism, which is used to remove the mixing tanks after mixing as a whole in a row; Figure 12 As shown, the unloading clamping mechanism includes an n-shaped cross-section clamping base 45 and an arc-shaped electromagnet 46 located on the lower side of the clamping base 45. The number of arc-shaped electromagnets 46 corresponds vertically to the grid of the mixing rack 2. The arc-shaped electromagnets 46 are used to attract the upper surface of the mixing tank. The unloading robotic arm 44 removes the mixed tank from the tank fixing plate 41. A control base plate 47 is provided on the lower surface of the clamping base 45, and a connecting base plate 48 is provided on the upper side of the clamping base 45. The execution end of the unloading robotic arm 44 is rigidly connected to the connecting base plate 48. A tank cylinder 49 and a separation cylinder 51 are sequentially provided on the control base plate 47. The push head of the tank cylinder 49 passes through the control base plate 47 and is fixed to the tank push plate 50. The tank push plate 50 is used to push... At the end of the mixing tank, the tank body is opened; the pusher of the separation cylinder 51 passes through the control base plate 47 and is fixed to the separation push plate 52; the mixing tank includes a cylindrical cavity tank body 53, which is made of iron; the bottom of the tank body 53 has an opening, and the upper end of the tank body 53 is slidably fitted with a tank shaft 54, and a cover 55 is provided on the lower side of the tank shaft 54; the cover 55 includes a conical part and a cylindrical part, the cylindrical part is used to close the bottom opening of the tank body 53, and the conical part is used to guide the material when the cover 55 is opened; the upper side of the tank shaft 54 ​​extends out of the tank body 53 and is fixed to the opening plate 56, and a tank body spring 57 passes through the tank shaft 54 ​​between the opening plate 56 and the tank body 53, the tank body spring 57 is used to force the cover 55 to close the bottom opening of the tank body 53.

[0050] After mixing is completed, the lateral movement mechanism 43 drives the unloading robot arm 44 to move to the front of the mixing rack 2, and the arc-shaped electromagnet 46 of the unloading clamping mechanism is aligned with the upper surface of the mixing tank. When the arc-shaped electromagnet 46 is energized, it uses magnetic attraction to stably attract the upper surface of the mixing tank to the lower side of the clamping base 45. Then the unloading robot arm 44 is lifted, and the row of mixing tanks is separated from the tank fixing plate 41 by the attraction force of the arc-shaped electromagnet 46. When the lateral movement mechanism 43 drives the unloading robot arm 44 to move to the unloading position, the tank cylinder 49 is activated, and its pusher pushes the tank push plate 50 to move forward. The tank push plate 50 acts on the opening plate 56 on the tank shaft 54, compressing the tank spring 57 on the tank shaft 54, so that the tank shaft 54 ​​drives the cover 55 to move downward. The columnar part of the cover 55 is separated from the bottom opening of the tank body 53, and the conical part is gradually exposed and guides the material in the tank to be discharged along the conical part.

[0051] The direct separation of the mixing tank by the arc-shaped electromagnet 46 will stretch the floating spring 40. When the mixing tank finally separates from the tank fixing plate 41, the tank fixing plate 41 will collide with the mixing rack 2 under the action of the floating spring 40. Over time, this will cause damage to both the floating spring 40 and the tank fixing plate 41. To solve this problem, such as... Figures 13-14 As shown, a separating shaft 58 is slidably fitted on the mixing rack 2. One side of the separating shaft 58 is fixed to the separating driven plate 59, and the other side of the separating shaft 58 is fixed by the separating connecting plate 60. A guide block 61 is provided between the two mixing racks 2. The guide block 61 is located on the lower side of the tank fixing plate 41. An L-shaped guide channel 62 is opened on the guide block 61. One end of the separating rope 63 is connected to the lower side of the tank fixing plate 41. The other end of the separating rope 63 passes through the guide channel 62 and is fixed to the side of the separating driven plate 59. The separating push plate 52 presses the separating driven plate 59, and the separating driven plate 59 pulls the separating rope 63, thereby driving the tank fixing plate 41 to move downward, so that the tank fixing plate 41 is separated from the mixing tank.

[0052] like Figure 15As shown, when the arc-shaped electromagnet 46 of the unloading clamping mechanism adsorbs the upper surface of the mixing tank, the separation cylinder 51 extends, driving the separation push plate 52 to move synchronously and press the separation driven plate 59, causing the separation shaft 58, which is fixed to the separation driven plate 59, to slide along the mixing frame 2, and drive the separation rope 63 to move through the separation connecting plate 60; the separation rope 63 drives the tank fixing plate 41 to move downward against the elastic force of the floating spring 40, so that the tank fixing plate 41 separates from the mixing tank; when the arc-shaped electromagnet 46 adsorbs the mixing tank upward and separates, the tank fixing plate 41 is already controlled. As the unloading robot arm 44 moves downward, the separation cylinder 51 extends, keeping the separation driven plate 59 under continuous pressure. When the mixing tank moves out of the mixing rack 2, the separation cylinder 51 is retracted and extended. Through the mechanical linkage of the separation push plate 52, the separation driven plate 59, the separation shaft 58 and the separation rope 63, the adsorption action of the unloading clamping mechanism is combined with the displacement control of the tank fixing plate 41. This avoids the impact problem of the sudden release after the floating spring 40 is stretched in the original structure, and there is no rigid impact between the tank fixing plate 41 and the mixing rack 2.

[0053] During the process of unloading material from the mixing tank to the sintering tank, the problem of material sticking can easily occur; for example... Figures 16-17 As shown, anti-sticking units are provided on both sides of the clamping base 45. The anti-sticking units are connected to the execution end of the unloading robot arm 44 through the switching unit. The anti-sticking units are used to generate oscillations in the clamping base 45 to prevent sticking during unloading of the mixing tank. The switching unit is used to switch between rigidity and flexibility to avoid the oscillations being transmitted to the unloading robot arm 44 and causing the unloading robot arm 44 to alarm.

[0054] like Figures 18-20As shown, the anti-adhesion unit includes an anti-adhesion base frame 64 with an n-shaped cross-section and a rotating base plate 65 fixed to the anti-adhesion base frame 64. The rotating base plate 65 has an O-shaped cross-section. A reciprocating driven shaft 66 is slidably fitted on the anti-adhesion base frame 64. One side of the reciprocating driven shaft 66 is fixed to the side of the clamping base 45, and the other end of the reciprocating driven shaft 66 passes through the anti-adhesion base frame 64 and is fixed to a reciprocating limiting plate 67. A reciprocating spring 68 passes through the reciprocating driven shaft 66 between the reciprocating limiting plate 67 and the anti-adhesion base frame 64. A conversion fixing plate 69 is provided on both sides of the rotating base plate 65. A rotating shaft 70 is provided on one side of the rotating base plate 65. The rotating shaft 70 and the L-shaped conversion fixing plate 69 are rotatably fitted by bearings. An anti-adhesion drive motor 71 and a conversion cylinder 72 are provided on the other side of the conversion fixing plate 69. The push head of the conversion cylinder 72 passes through the conversion fixing plate 69 and the L-shaped cross-section. A cross-section conversion pressure frame 73 is fixed and used to press against the side of the rotating base plate 65 to restrict the rotation of the rotating base plate 65. A reciprocating drive shaft 74 is rotatably fitted on the rotating base plate 65 on the corresponding side of the anti-stick drive motor 71. The motor shaft of the anti-stick drive motor 71 is fixed to one end of the reciprocating drive shaft 74 through a coupling. The other end of the reciprocating drive shaft 74 is fixed to the drive ring sleeve 75. The end of the drive ring sleeve 75 is provided with a semi-circular cross-section drive groove 76. A swinging pin 77 is provided between the reciprocating limiting plates 67 on the corresponding side of the drive ring sleeve 75. The swinging pin 77 is locked in the drive groove 76. A ratchet gear 78 is keyed to the reciprocating drive shaft 74. A ratchet clip 79 is rotatably fitted on the rotating base plate 65 through a torsion spring. The ratchet clip 79 is pressed onto the ratchet gear 78. The rotation of the reciprocating drive shaft 74 drives the ratchet gear 78 to rotate.

[0055] The switching unit includes a switching frame 80, the middle of which is fixed to the execution end of the unloading robotic arm 44. Cylinder ears are provided on both sides of the switching frame 80, and switching cylinders 81 are mounted on the cylinder ears. The push head of the switching cylinder 81 passes through the cylinder ear and is fixed to the switching pressure plate 82. A ring is provided on the other side of the switching pressure plate 82. A tapered protrusion 83 is provided on the upper side of the conversion fixing plate 69, and the upper side of the tapered protrusion 83 is connected to the cylinder ear via a switching rope 84. The switching rope 84 passes through the ring. During displacement, the switching cylinder 81 drives the switching pressure plate 82 to press against the upper side of the conversion fixing plate 69 to form a rigid support. During vibration discharge, the switching cylinder 81 drives the switching pressure plate 82 to retract, forming a flexible connection through the switching rope 84 to prevent the unloading robotic arm 44 from triggering an alarm.

[0056] The arc-shaped electromagnet 46 adsorbs the mixing tank. After the mixing tank separates from the tank fixing plate 41, the lateral movement mechanism 43 drives the unloading robot arm 44 to move to the unloading position. During this process, the anti-stick drive motor 71 drives the reciprocating drive shaft 74 to rotate clockwise, causing the ratchet 78 keyed to the shaft to rotate synchronously. Under the action of the ratchet latch 79, the rotating base plate 65 rotates as a whole, thereby driving the clamping base 45 to rotate as a whole. During the rotation, the mixing tank rotates axially, reducing the adhesion of the internal mixture. When the lateral movement mechanism 43 drives the unloading robot arm 44 to move to the unloading position, the opening of the changing tank faces downward. The switching cylinder 81 retracts, the switching pressure plate 82 disengages from the conical protrusion 83, and at this time the switching rope 8... 4. A flexible connection is formed through the ring sleeve; the extension of the conversion cylinder 72 and the conversion pressure frame 73 are used to press on the side of the rotating base plate 65 to restrict the rotation of the rotating base plate 65; the anti-stick drive motor 71 drives the reciprocating drive shaft 74 to rotate counterclockwise, the ratchet 79 does not restrict the ratchet gear 78, the reciprocating drive shaft 74 rotates relative to the rotating base plate 65, driving the drive ring sleeve 75 to rotate, its semi-circular drive groove 76 cooperates with the swing pin 77, when the drive ring sleeve 75 rotates, the swing pin 77 slides along the inner wall of the groove, pushes the reciprocating limit plate 67 to drive the reciprocating driven shaft 66 to make reciprocating linear motion in the anti-stick base frame 64, thereby driving the unloading clamping mechanism to reciprocate and vibrate synchronously, and the mixing tank is discharged through the reciprocating vibration.

[0057] A second aspect of this invention provides a method for preparing grain boundary diffusion, comprising the following steps: Step 1: Cut the prepared NdFeB blank into finished NdFeB products of the specified dimensions. Step 2: Using a neodymium iron boron diffusion mixing device, the neodymium iron boron products of the finished specifications and sizes are coated with a fixed proportion of heavy rare earth raw materials to obtain products with added heavy rare earth. Step 3: The product with added heavy rare earth elements is loaded into a high vacuum sintering furnace for grain boundary diffusion treatment.

[0058] Conventional grain boundary diffusion preparation methods involve processing large sheets → grain boundary diffusion → processing finished products. The entire process, from raw material to finished product, is completed intermittently in two stages, making the process complex and resulting in long product delivery times. The grain boundary diffusion preparation method proposed in this application eliminates post-diffusion processing, reducing the impact on product quality and better meeting customers' demands for high Br and high Hcj permanent magnets. At the same time, it reduces material input and costs, minimizes grinding and machining without damaging the magnet structure, and results in permanent magnets with good quality consistency, high temperature resistance, and a high pass rate. It also reduces the input of heavy rare earth raw materials, minimizing waste.

[0059] Unless otherwise specified, the above methods of fixing all use common technical means employed by industry professionals, such as welding, nesting, or threaded fixing.

[0060] The following points need to be explained: (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 the general design.

[0061] (2) For clarity, the thickness of layers or regions is enlarged or reduced in the drawings used to describe embodiments of the present invention, i.e., these drawings are not drawn to actual scale; it is understood that when an element such as a layer, film, region or substrate is referred to as being “above” or “below” another element, the element may be “directly” located “above” or “below” the other element or there may be intermediate elements.

[0062] (3) 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.

[0063] The above are merely specific embodiments of the present invention, but the scope of protection of the present invention is not limited thereto. The scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A neodymium-iron-boron diffusion mix device, characterized by, The utility model relates to a mixing frame, which comprises a fixed frame (1) and a mixing frame (2) slidingly fitted in the fixed frame (1), wherein the mixing frame (2) adopts a double-layer grid structure, and a mixing tank is fixed in the grid; the bottom of the fixed frame (1) is provided with a driving device for driving the mixing frame (2) to slide up and down along the fixed frame (1) to mix materials; the side of the mixing frame (2) is provided with a sliding shaft (4); the two sides of the fixed frame (1) are provided with sliding sleeves (8) through sliding connecting plates (7), and the sliding shaft (4) is fitted in the sliding sleeves (8) on the two sides; the driving device comprises a driving motor (9) and a floating mechanism connected with the driving device, the driving motor (9) drives the floating mechanism to drive the mixing frame (2) to slide up and down along the fixed frame (1) to mix materials; the driving motor (9) is slidingly fitted with the bottom of the fixed frame (1); when the machine stops, the driving motor (9) is separated from the floating mechanism of the driving device.

2. The neodymium-iron-boron diffusion mix device of claim 1, wherein, The floating mechanism comprises a circular rotating plate (12), one side of the rotating plate (12) is welded with a driving shaft (13) at the center, the driving shaft (13) is fixedly connected with the output shaft of the driving motor (9) through a shaft coupling, the other end of the rotating plate (12) is fixedly connected with an eccentric shaft (14) through insertion, and the eccentric shaft (14) is located at a position other than the center of the rotating plate (12); the bottom of the mixing frame (2) is provided with a swing plate (15), two swing ears (16) are oppositely arranged on the swing plate (15), and a swing sliding shaft (17) is horizontally welded between the swing ears (16); one end of a supporting arm (18) is rotatably connected with the eccentric shaft (14) through a rotating sleeve (19), and the other end of the supporting arm (18) is slidingly connected with the swing sliding shaft (17) through a sliding ring (20).

3. The neodymium-iron-boron diffusion mix device of claim 2, wherein, The rotating plate (12) and the eccentric shaft (14) are connected through insertion, the rotating plate (12) is provided with a non-circular insertion shaft (21), the end of the eccentric shaft (14) is provided with a corresponding insertion groove (22), and the insertion shaft (21) can be fitted in the insertion groove (22).

4. The neodymium-iron-boron diffusion mix device of claim 1, wherein, The bottom of the fixing frame (1) is opposite to two motor sliding shafts (23), the driving motor (9) is fixed on the upper side of the motor sliding plate (24), the lower side of the motor sliding plate (24) is slidably connected with the motor sliding shaft (23) through a sliding sleeve, and the bottom of the fixing frame (1) is provided with a motor push rod (25); the bottom of the fixing frame (1) is provided with a support beam frame (26) with an n-shaped cross section, the support beam frame (26) is slidably connected with a support beam column (27), the upper side of the support beam column (27) is provided with a support pad (28); the lower side of the support beam column (27) is provided with a support roller (29); the bottom of the fixing frame (1) is opposite to two push block sliding shafts (30), the push block sliding shaft (30) is slidably connected with a support push block (31), and the upper surface of the support push block (31) is a broken line shape with parallel ends; the lower end of the support beam column (27) is provided with a beam column limiting plate (32), and the support beam column (27) is provided with a beam column spring (33); the lower side of the motor sliding plate (24) is provided with a sliding plate sleeve ring (34), the sliding plate sleeve ring (34) is slidably connected with a clutch driving shaft (35); the push head of the motor push rod (25) penetrates out of the fixing frame (1) and is fixed with one end of the clutch driving shaft (35), the other end of the clutch driving shaft (35) penetrates out of the sliding plate sleeve ring (34) and is fixed with a first clutch driving plate (36), and the shaft body of the clutch driving shaft (35) is provided with a second clutch driving plate (37); the clutch driving spring (38) penetrates the clutch driving shaft (35), and the clutch driving spring (38) is clamped between the second clutch driving plate (37) and the sliding plate sleeve ring (34); the first clutch driving plate (36) is provided with a support push frame (39), and the two ends of the support push frame (39) are respectively fixed with the side portions of the support push block (31).

5. The neodymium-iron-boron diffusion mix device of claim 1, wherein, The grid of the mixing frame (2) is fixed with a semicircular cross-section tank fixing plate (41) through a floating spring (40), the upper surface of the tank fixing plate (41) is embedded with two arc-shaped magnets (42), and the arc-shaped magnets (42) are used for adsorbing the mixing tank in the tank fixing plate (41).

6. The neodymium-iron-boron diffusion mix device of claim 5, wherein, The side of the fixing frame (1) is provided with a transverse moving mechanism (43), the upper side of the transverse moving mechanism (43) is provided with a discharging mechanical arm (44), the execution end of the discharging mechanical arm (44) is provided with a discharging clamping mechanism, and the discharging clamping mechanism is used for taking out the mixed tank in which the mixing is completed in a row; the mixed tank comprises a cylindrical cavity tank body (53), and the tank body (53) is made of metal material; the bottom of the tank body (53) has an opening, the upper end of the tank body (53) is slidably connected with a tank shaft (54), and the lower side of the tank shaft (54) is provided with a cover (55); the cover (55) comprises a conical portion and a cylindrical portion, the cylindrical portion is used for closing the opening at the bottom of the tank body (53), and the conical portion is used for guiding material when the cover (55) is opened; the upper side of the tank shaft (54) extends out of the tank body (53) and is fixed with an opening plate (56), and the tank shaft (54) between the opening plate (56) and the tank body (53) penetrates a tank spring (57).

7. The neodymium-iron-boron diffusion mix device of claim 6, wherein, The discharging clamping mechanism comprises a clamping base (45) with an n-shaped cross section and an arc-shaped electromagnet (46) arranged on the lower side of the clamping base (45) and used for adsorbing the upper surface of the mixing tank; the lower surface of the clamping base (45) is provided with a control base plate (47), and the upper side of the clamping base (45) is provided with a connecting base plate (48), and the execution end of the discharging mechanical arm (44) is rigidly connected with the connecting base plate (48); the control base plate (47) is sequentially provided with a tank cylinder (49) and a separation cylinder (51), the push head of the tank cylinder (49) penetrates through the control base plate (47) and is fixed with a tank push plate (50), and the tank push plate (50) is used for pushing the end of the mixing tank to open the tank; the push head of the separation cylinder (51) penetrates through the control base plate (47) and is fixed with a separation push plate (52).

8. The neodymium-iron-boron diffusion mix device of claim 7, wherein, The two sides of the clamping base (45) are provided with anti-sticking units, the anti-sticking units are connected with the execution end of the discharging mechanical arm (44) through a switching unit, and the anti-sticking units are used for generating oscillation on the clamping base (45); the switching unit is used for rigid-flexible switching; the anti-sticking unit comprises an anti-sticking base frame (64) with an n-shaped cross section and a rotating base plate (65) fixed with the anti-sticking base frame (64), and the rotating base plate (65) has an O-shaped cross section; the anti-sticking base frame (64) is slidably provided with a reciprocating driven shaft (66), one side of the reciprocating driven shaft (66) is fixed with the side of the clamping base (45), the other end of the reciprocating driven shaft (66) penetrates through the anti-sticking base frame (64) and is fixed with a reciprocating limiting plate (67), and the reciprocating spring (68) is arranged on the reciprocating driven shaft (66) between the reciprocating limiting plate (67) and the anti-sticking base frame (64); the two sides of the rotating base plate (65) are provided with a conversion fixed plate (69), one side of the rotating base plate (65) is provided with a rotating shaft (70), and the rotating shaft (70) is rotatably connected with the conversion fixed plate (69) with an L-shaped cross section through a bearing; the other side of the conversion fixed plate (69) is provided with an anti-sticking driving motor (71) and a conversion cylinder (72), the push head of the conversion cylinder (72) penetrates through the conversion fixed plate (69) and is fixed with a conversion pressing frame (73) with an L-shaped cross section, and the conversion pressing frame (73) is used for pressing the side of the rotating base plate (65) to limit the rotation of the rotating base plate (65); the rotating base plate (65) on the side corresponding to the anti-sticking driving motor (71) is rotatably provided with a reciprocating driving shaft (74), the motor shaft of the anti-sticking driving motor (71) is fixed with one end of the reciprocating driving shaft (74) through a shaft coupling; the other end of the reciprocating driving shaft (74) is fixed with a driving ring sleeve (75), the end of the driving ring sleeve (75) is provided with a driving groove (76) with a semicircular cross section, the reciprocating limiting plates (67) on the side corresponding to the driving ring sleeve (75) are provided with a swing clamping column (77), and the swing clamping column (77) is clamped in the driving groove (76); the reciprocating driving shaft (74) is keyed with a ratchet gear (78), the rotating base plate (65) is rotatably provided with a ratchet clamping (79) through a torsion spring, and the ratchet clamping (79) is clamped on the ratchet gear (78); the reciprocating driving shaft (74) rotates to drive the ratchet gear (78) to rotate.

9. The neodymium-iron-boron diffusion mix device of claim 8, wherein, The switching unit comprises a switching rack (80), the middle of the switching rack (80) is fixed with the execution end of the unloading mechanical arm (44), the two sides of the switching rack (80) are provided with cylinder ears, the cylinder ears are provided with switching cylinders (81), the push heads of the switching cylinders (81) are fixed with switching pressure plates (82) through the cylinder ears; the other side of the switching pressure plate (82) has a ring sleeve; the upper side of the conversion fixed plate (69) is provided with a conical convex (83), the upper side of the conical convex (83) is connected with the cylinder ear through a switching rope (84); the switching rope (84) passes through the ring sleeve; when shifting, the switching cylinder (81) drives the switching pressure plate (82) to be pressed on the upper side of the conversion fixed plate (69) to form a rigid support, when vibrating and discharging, the switching cylinder (81) drives the switching pressure plate (82) to be withdrawn, and a flexible connection is formed through the switching rope (84).

10. A method of grain boundary diffusion preparation, characterized by, The method comprises the following steps: Step one, cutting the prepared neodymium iron boron blank square into a finished product size of neodymium iron boron product; Step two, using the neodymium iron boron diffusion mixing device as claimed in claim 1, the finished product size of neodymium iron boron product is mixed with heavy rare earth raw materials in a fixed proportion, the finished product size of neodymium iron boron product is coated on the surface to obtain a product added with heavy rare earth; Step three, the product added with heavy rare earth is loaded into a high vacuum sintering furnace for grain boundary diffusion treatment.

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