A mixing mechanism and automatic dip-coating mechanism for sintered NdFeB grain boundary diffusion slurry

Abstract

This invention relates to the field of slurry mixing technology, and discloses a sintered NdFeB grain boundary diffusion slurry mixing mechanism and an automatic dip-coating mechanism. The mechanism includes a frame, a base plate connected to the lower layer of the frame, a base mounted on the base, and a feeding tank mounted on the base. A first discharge pipe with a valve is installed on the lower side wall of the feeding tank. The first discharge pipe is used to convey slurry to the dip-coating tank. The dip-coating tank is mounted on the base plate. A first support plate is mounted on the top surface of the frame, and two first bearing seats are mounted on the first support plate. A stirring rod is rotatably connected to the first bearing seats. The stirring rod is connected to a first motor via a worm gear mechanism. A stirring paddle is mounted at the lower end of the stirring rod. This application achieves automated and precise dip-coating, reduces the impact of solvent evaporation, extends equipment life, and ensures the diffusion effect of the magnet and the stability of product quality.

Description

Technical Field

[0001] This invention relates to the field of slurry mixing technology, and in particular to a sintered NdFeB grain boundary diffusion slurry mixing mechanism and an automatic dip-coating mechanism. Background Technology

[0002] Grain boundary diffusion technology for NdFeB permanent magnets has become a key technology in recent years for improving the coercivity of sintered NdFeB magnets. It can significantly enhance the magnet's resistance to demagnetization without losing remanence, which is crucial for meeting the high-temperature stability and magnetic performance requirements of high-performance applications such as drive motors for new energy vehicles, wind turbines, and energy-saving home appliance motors. The core diffusion mechanism is as follows: a diffusion source containing heavy rare earth elements (or their compounds) (such as metals, alloys, fluorides, oxide powders, slurries, thin films, etc.) is applied to the magnet surface. Under a low-temperature heat treatment environment of 800°C-1000°C, heavy rare earth element atoms diffuse inward along the magnet's grain boundary network, partially replacing NdFeB atoms near the main phase grain boundaries.

[0003] Among various diffusion source coating methods, dip coating is a commonly used choice due to its simplicity and controllable cost. Its core process involves slowly and uniformly immersing a pretreated magnet into a slurry containing heavy rare earth compounds (such as TbF3 / DyF3 fluorides). After wetting for several seconds to tens of seconds, the magnet is vertically lifted at a uniform speed of 0.1-10 mm / s, and then briefly suspended to allow excess slurry to drip off naturally, reducing edge accumulation. However, this method requires extremely high slurry stability, as diffusion source particles are prone to sedimentation and agglomeration, necessitating continuous stirring to maintain their state. Existing stirring blades suffer from high loads and are easily damaged during operation. Summary of the Invention

[0004] The purpose of this invention is to provide a mixing mechanism and an automatic dip-coating mechanism for sintered NdFeB grain boundary diffusion slurry, thereby solving the problem of the stirring blades being easily damaged under heavy load during operation as mentioned in the background art.

[0005] The technical solution adopted in this invention is as follows: A sintered NdFeB grain boundary diffusion slurry mixing mechanism includes a frame, a base plate connected to the lower layer of the frame, a base mounted on the base plate, and a feeding tank mounted on the base plate; a first discharge pipe is mounted on the lower side wall of the feeding tank, and a valve is mounted on the first discharge pipe; the first discharge pipe is used to convey slurry to the immersion tank; the immersion tank is mounted on the base plate; a first bearing plate is mounted on the top surface of the frame, and two first bearing seats are mounted on the first bearing plate, with a stirring rod rotatably connected to the first bearing seats; the stirring rod is connected to a first motor through a worm gear mechanism; and a stirring paddle is mounted on the lower end of the stirring rod.

[0006] The tooling fixture includes a second carrier plate connected to a second slide block. The bottom surface of the second carrier plate is connected to four first insert rods, with two first insert rods forming a group. A first insert tube is slidably connected to the first insert rod. The first insert tube is fixed to the first insert rod by a positioning pin. The first insert tube is connected to the dip coating fixture.

[0007] The tooling fixture includes a third carrier plate connected to a second slide block. A third shaft is connected to the bottom surface of the third carrier plate and is perpendicular to the third carrier plate. A sphere is fixed to the free end of the third shaft. A first rotating seat is rotatably connected to the sphere. A second semi-circular groove is formed on one end face of the first rotating seat for placing the sphere. A first panel is connected to the other end face of the first rotating seat. The first panel is rectangular in shape and has four first insert rods connected to its end face. Two first insert rods form a group. A first insert tube is slidably connected to the first insert rod. The first insert tube and the first insert rod are fixed by a positioning pin. The first insert tube is connected to the dip coating fixture. A second panel is connected to the first panel by four double-ended bolts. The second panel is annular in shape and has a second rotating seat connected to its center. The end face of the second rotating seat has a flared hole for placing the sphere. A second telescopic rod is installed on the bottom surface of the third carrier plate. There are four second telescopic rods arranged at equal angles. The piston end of the second telescopic rod abuts against the second panel.

[0008] The bottom surface of the first insertion tube has a rounded corner structure. A hinge seat is rotatably connected to the first insertion tube, and the hinge seat is connected to the dip coating fixture. A base is connected to the bottom surface of the first panel, and two symmetrically arranged second connecting rods are hinged to the bottom surface of the base. A fourth support is hinged to the free end of the second connecting rod, and the fourth support is connected to the dip coating fixture. A second cylinder seat is installed on the base, and the second cylinder seat is U-shaped. A push rod is slidably connected to the horizontal section of the second cylinder seat. A third telescopic rod is installed at the upper end of the push rod, and the tail end of the third telescopic rod is connected to the base. A second spring is sleeved on the side wall of the push rod, and the second spring is elastically connected to the base. Between the piston end of the second cylinder seat and the third telescopic rod; a I-shaped seat is slidably connected to the side wall of the push rod located below the second cylinder seat, and the I-shaped seat is fixed to the second cylinder seat; two notches of the I-shaped seat are rotatably connected to wedge heads, and the inclined surfaces of the two wedge heads face each other to form a constricted structure; a third connecting rod is installed on the back surface of the wedge head, and the free end of the third connecting rod is hinged to the fourth support; a first spring seat is rotatably connected to the side wall of the two wedge heads, and the first spring seat is located at the waist of the wedge head, and a third spring is installed between the two first spring seats; a conical block is installed at the lower end of the push rod, and the inclined surface of the conical block slides in contact with the two wedge heads.

[0009] The beneficial effects of this invention are as follows: This application effectively avoids the deposition of heavy rare earth compounds and reduces motor load through the design of an adaptable stirring rod and an elastic buffer / angle-adjustable stirring paddle. Combined with a constant temperature component to maintain a constant slurry temperature, and a guide rod and needle rod to break air bubbles, it ensures the stability and purity of the slurry. By controlling the liquid level with a float and adjusting the lifting speed and dipping position with a precise drive mechanism, along with a multi-angle tilting and forward / backward moving dipping fixture and profile plate positioning structure, it solves the problems of uneven coating thickness and edge effects, improving dipping uniformity. A drip box recovers excess slurry, improving material utilization. A convenient fixture installation and adjustment structure adapts to magnets of different specifications. Standardized operating procedures reduce the impact of solvent evaporation on slurry performance. Ultimately, it achieves automation and precision in the dipping process, extends equipment lifespan, and ensures magnet diffusion effect and product quality stability. Attached Figure Description

[0010] Figure 1 This is a three-dimensional structural diagram of this application.

[0011] Figure 2 This is a side view sectional diagram of the immersion tank.

[0012] Figure 3 This is a top view of the agitator structure.

[0013] Figure 4 This is a three-dimensional structural diagram of the first blade.

[0014] Figure 5 This is a schematic diagram of the front cross-sectional structure of the thermostatic component.

[0015] Figure 6 This is a schematic diagram of the main structure of the heat dissipation tank.

[0016] Figure 7 This is a schematic diagram of the front cross-sectional structure of the heat dissipation tank.

[0017] Figure 8 This is a side view cross-sectional diagram of the guide rod.

[0018] Figure 9 This is a side view of the second discharge pipe.

[0019] Figure 10 This is a side view cross-sectional diagram of the second discharge pipe.

[0020] Figure 11 This is a side view sectional diagram of the valve core.

[0021] Figure 12 This is a three-dimensional structural diagram of the lever.

[0022] Figure 13 This is a schematic diagram of the three-dimensional structure of the long rod.

[0023] Figure 14 This is a schematic diagram of the three-dimensional structure of the second blade.

[0024] Figure 15 This is a side view sectional diagram of the adjusting rod.

[0025] Figure 16 This is a side view sectional diagram of the shell structure.

[0026] Figure 17 This is a three-dimensional structural diagram of the first guide rod.

[0027] Figure 18 This is a schematic diagram of the main structure of the first slide rail.

[0028] Figure 19 This is a three-dimensional structural diagram of the second guide rod.

[0029] Figure 20 This is a three-dimensional structural diagram of the tooling.

[0030] Figure 21 This is a schematic diagram of the three-dimensional structure of the first carrier plate.

[0031] Figure 22 This is a schematic diagram of the main structure of the dip coating fixture.

[0032] Figure 23 This is a schematic diagram of the three-dimensional structure of the dip coating fixture.

[0033] Figure 24 This is a schematic diagram of the main structure of the profile panel.

[0034] Figure 25 This is a side view sectional diagram of the dip coating fixture.

[0035] Figure 26 This is a schematic diagram of the main sectional view of the pin.

[0036] Figure 27 This is a three-dimensional structural diagram of the first insertion rod.

[0037] Figure 28 This is a schematic diagram of the main view structure of the first panel.

[0038] Figure 29 This is a schematic diagram of the three-dimensional structure of the second panel.

[0039] Figure 30 This is a schematic diagram of the front view cross-section of a sphere.

[0040] Figure 31 This is a schematic diagram of the main structure of the hinged seat.

[0041] Figure 32This is a side view of the base and the second connecting rod.

[0042] Figure 33 This is a side view of the third link.

[0043] Figure 34 This is a schematic diagram of the side cross-sectional structure of the wedge-shaped head.

[0044] Figure 35 This is a three-dimensional structural diagram of the immersion tank and the third carrier plate.

[0045] In the diagram: 1. Frame; 2. Square tube; 3. Base plate; 4. Base; 5. Feeding tank; 6. First discharge pipe; 7. Valve; 8. Immersion tank; 9. First bearing plate; 10. First bearing seat; 11. Stirring rod; 12. Worm gear mechanism; 13. First motor; 14. Stirring paddle; 15. First support; 16. Second support; 17. First support rod; 18. Column; 19. First blade; 20. Second support rod; 21. Reset spring; 22. Vertical rod; 23. Outer tank; 24. Accommodation gap; 25. Ring cover; 26. Constant temperature component; 27. Ring seat; 28. Heat dissipation tank; 29. ​​Heat dissipation hole; 30. Heat exchange channel; 31. First connecting pipe; 32. Liquid inlet pipe; 33. Liquid outlet pipe; 34. Second... 35. Connecting pipe; 36. Guide rod; 37. Limiting head; 38. Second discharge pipe; 39. Third discharge pipe; 40. Valve core; 41. Sealing ring; 42. Sealing ring; 43. Push rod; 44. Push head; 45. Paddle plate; 46. Rounded corner groove; 47. First shaft; 48. Third support; 49. First connecting seat; 50. Positioning bolt; 51. Second connecting seat; 52. Toothed groove; 53. Long rod; 54. Float; 55. Needle rod; 56. Housing; 57. Cavity; 58. Rotating seat; 59. Second blade; 60. Second shaft; 61. First connecting rod; 62. Adjusting rod; 63. Tightening head; 64. Screw; 65. Adjusting seat; 66. Ear seat; 67. First guide rod; 68. First slide; 69. First telescopic rod; 70. First slide rail; 71. Second slide block; 72. Tooling fixture; 73. Dipping tool; 74. Second bearing seat; 75. Lead screw; 76. Moving table; 77. Third motor; 78. Second guide rod; 79. Connecting seat; 80. Drop box; 81. Drop plate; 82. First carrier plate; 83. Notch groove; 84. Slide groove; 85. Groove; 86. Hanging rod; 87. Nut head; 88. First clamping plate; 89. Hinge; 90. Second clamping plate; 91. Slot; 92. Profile plate; 93. Through hole; 94. First semi-circular groove; 95. Connecting ear; 96. Long bolt; 97. Countersunk hole; 98. Pin; 99. Ball bearing; 100. First spring; 101. Second carrier plate ; 102. First insert rod; 103. First insert tube; 104. Positioning pin; 105. Third carrier plate; 106. Third shaft; 107. Ball; 108. First rotating seat; 109. Second semi-circular groove; 110. First panel; 111. Second panel; 112. Double-ended bolt; 113. Second rotating seat; 114. Horn hole; 115. Second telescopic rod; 116. Hinge seat; 117. Base; 118. Second connecting rod; 119. Fourth support; 120. Second cylinder seat; 121. Push rod; 122. Third telescopic rod; 123. Second spring; 124. I-shaped seat; 125. Wedge head; 126. Third connecting rod; 127. First spring seat; 128. Third spring; 129. Conical top block. Detailed Implementation

[0046] The embodiments of the present invention are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0047] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0048] Furthermore, the terms “first,” “second,” “third,” “fourth,” “fifth,” “sixth,” “seventh,” “eighth,” “ninth,” and “tenth” are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated.

[0049] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation", "connection", and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0050] like Figure 1-4As shown in Embodiment 1, a sintered NdFeB grain boundary diffusion slurry mixing mechanism includes a frame 1, which is a frame structure welded from square tubes 2. A base plate 3 is connected to the lower layer of the frame 1, and a base 4 is mounted on the base 3. A feed tank 5 is mounted on the base 4. The feed tank 5 is used to store the slurry containing a diffusion source (usually a heavy rare earth compound, such as TbF3 / DyF3 fluoride). A first discharge pipe 6 is installed on the lower side wall of the feed tank 5, and a valve 7 is installed on the first discharge pipe 6. The first discharge pipe 6 is used to mix the slurry containing the diffusion source (usually a heavy rare earth compound, such as TbF3 / DyF3 fluoride). The slurry is conveyed into the feed tank 8; an immersion tank 8 is installed on the bottom plate 3, which is used to store the slurry and can be immersed in the coating fixture 73 containing a magnet; a first bearing plate 9 is installed on the top surface of the frame 1, and two first bearing seats 10 are installed on the first bearing plate 9. A stirring rod 11 is rotatably connected to the first bearing seat 10. The length of the stirring rod 11 located in the feed tank 5 is shorter than the length of the stirring rod 11 located in the immersion tank 8; the stirring rod 11 is connected to a first motor 13 through a worm gear mechanism 12. 3 is connected to the first bearing plate 9; the lower end of the stirring rod 11 is equipped with a stirring paddle 14, the stirring paddle 14 includes a first support 15 and a second support 16 provided on the stirring rod 11, the number of first supports 15 is 3, a first support rod 17 is fixedly connected to the first support 15, a column 18 is welded to the top surface of the first support rod 17, and a first blade 19 is welded to the top of the column 18. The number of second supports 16 is 3, and the second supports 16 are located in the gap between adjacent first supports 15. A second support rod 20 is rotatably connected to the upper part of the agitator. A column 18 is welded to the top surface of the second support rod 20, and a first impeller 19 is welded to the top of the column 18. A reset spring 21 is connected at the angle between the second support rod 20 and the first support rod 17. The reset spring 21 can buffer the large torque of the first impeller 19 and can be adjusted clockwise adaptively, reducing the load on the first impeller and improving its service life. The second support rod 20 can be flexibly adjusted in angle through the reset spring 21, which can cover a wider area during stirring and reduce slurry sedimentation or agglomeration. The stirring motors of the upper and lower slurry tanks work continuously, and the feed tank 5 ensures the stability of the slurry, preventing the deposition of heavy rare earth elements. The technical problems that can be solved are: the easy deposition of heavy rare earth compounds in the slurry and the easy damage of the agitator 14 blades under heavy load during operation. Movement Process: The first motor 13 drives the stirring rod 11 to rotate via the worm gear mechanism 12. The stirring rod 11 drives the first support 15 and the second support 16 to rotate synchronously. The first blade 19 on the first support 15 rotates fixedly, while the second support rod 20 on the second support 16 adjusts its angle clockwise adaptively under the action of the reset spring 21, stirring the slurry as the stirring rod 11 rotates. Beneficial Effects: The lengths of the stirring rods 11 in the feed tank 5 and the immersion tank 8 are adapted to their respective stirring needs. The reset spring 21 buffers the large torque of the first blade 19, reducing the motor load, extending the equipment's service life, preventing the deposition of heavy rare earth elements, and ensuring slurry stability.

[0051] like Figure 5-7 As shown, as an optimization of Embodiment 1, the bottom surface of the immersion tank 8 is connected to vertical rods 22, and four vertical rods 22 are arranged at equal angles. The lower end of the vertical rods 22 is connected to an outer tank 23, and there is a receiving gap 24 between the outer tank 23 and the immersion tank 8. The top surface of the outer tank 23 is connected to a ring cover 25. A temperature control component 26 is installed in the receiving gap 24. The temperature control component 26 includes a ring seat 27 disposed on the inner wall of the outer tank 23, and a heat dissipation tank 28 is connected to the ring seat 27. The side walls of the heat dissipation tank 28 have equal angles and are arranged from top to bottom. The heat dissipation holes 29 are evenly spaced below. A heat exchange channel 30 is formed on the top surface of the heat dissipation tank 28 between the heat dissipation holes 29. Adjacent heat exchange channels 30 on the bottom surface of the heat dissipation tank 28 are connected by a first connecting pipe 31, which is U-shaped. Two heat exchange channels 30 on the top surface of the heat dissipation tank 28 are respectively connected to an inlet pipe 32 and an outlet pipe 33 extending to the outside of the outer tank 23. The remaining adjacent heat exchange channels 30 are connected by a second connecting pipe 34, which is U-shaped. This solves the technical problem of unstable slurry temperature in the immersion tank 8, affecting slurry performance and magnet coating effect. The process involves the constant-temperature medium entering the heat exchange channel 30 of the heat dissipation tank 28 through the inlet pipe 32. It circulates within the heat exchange channel 30 via the U-shaped first connecting pipe 31 and second connecting pipe 34, exchanging heat with the slurry in the immersion tank 8 through the heat dissipation holes 29 on the side wall of the heat dissipation tank 28. After heat exchange, the constant-temperature medium flows out from the outlet pipe 33. Beneficial effects: Maintains a constant temperature of the slurry in the immersion tank 8, ensures stable slurry concentration and viscosity, and improves the uniformity and diffusion effect of magnet coating.

[0052] like Figure 8 As shown, as an optimization of Embodiment 1, a guide rod 35 is slidably connected to the first discharge pipe 6. The upper end of the guide rod 35 has a limiting head 36, and the lower end of the guide rod 35 extends into the immersion tank 8. The guide rod 35 can prevent air bubbles from being generated when the slurry flows into the immersion tank 8. Technical problem solved: Air bubbles are easily generated when the slurry flows from the replenishment tank 5 into the immersion tank 8 through the first discharge pipe 6, affecting the quality of magnet coating. Movement process: When the slurry is conveyed through the first discharge pipe 6, the guide rod 35 guides the slurry to flow along its surface into the immersion tank 8. The limiting head 36 restricts the sliding stroke of the guide rod 35, preventing the guide rod 35 from detaching from the first discharge pipe 6. Beneficial effects: Prevents air bubbles from being generated during the slurry flow, ensures slurry purity, and improves the surface quality of magnet coating.

[0053] like Figure 9-13As shown in Embodiment 2, unlike Embodiment 1, a second discharge pipe 37 is installed on the lower side wall of the feeding hopper 5. The second discharge pipe 37 is horizontally arranged, and a third discharge pipe 38 is connected to the side wall of the second discharge pipe 37. The third discharge pipe 38 is vertically arranged. A valve core 39 is slidably connected inside the second discharge pipe 37. The valve core 39 is used to control the opening and closing of the third discharge pipe 38. A sealing ring 40 and a sealing ring 41 are connected to the side wall of the valve core 39. The sealing ring 41 is elastically fitted with the inner wall of the second discharge pipe 37. A push rod 42 is connected to the valve core 39. A push head 43 is connected to the push rod 42 located outside the second discharge pipe 37. A spring is sleeved on the push rod 42. The spring is elastically connected between the push head 43 and the valve core 39. A lever plate 44 is slidably connected to the push head 43. The lever plate 44 has a rounded groove 45 that is adapted to slide with the push head 43. A first shaft is rotatably connected to the middle of the lever. 46. ​​The first shaft 46 is connected to the third support 47, which is connected to the side wall of the third discharge pipe 38. The lower end of the lever is connected to the first connecting seat 48, which is connected to the second connecting seat 50 by the positioning bolt 49. The opposing surfaces of the first connecting seat 48 and the second connecting seat 50 have toothed grooves 51. Adjusting the relative position of the toothed grooves 51 of the first connecting seat 48 and the second connecting seat 50 can change the angle of the float 53. The side wall of the second connecting seat 50 is connected to the long rod 52, and the lower end of the long rod 52 is threadedly connected to the float 53. When the float 53 rises, it can push the valve core 39 to close the third discharge pipe 38. When the float 53 falls, it can pull the valve core 39 to open the third discharge pipe 38. The float 53 controls the liquid level of the slurry in the immersed tank 8 to ensure that the liquid level of the slurry remains unchanged. Preferably, the side wall of the long rod 52 is connected to needle rods 54 arranged at equal angles. The needle rods 54 can puncture the air bubbles on the surface of the slurry. Technical problems solved: The slurry level in the immersion tank 8 cannot be automatically controlled, and fluctuations in the slurry level affect the immersion coating effect, leading to air bubbles easily forming on the slurry surface. Movement process: When the slurry level in the immersion tank 8 rises, the float 53 rises, causing the long rod 52 and the lever 44 to rotate around the first shaft 46. The lever 44 pushes the top rod 42 and the valve core 39 into the second discharge pipe 37, closing the third discharge pipe 38. When the slurry level drops, the float 53 sinks, pulling the valve core 39 to move and opening the third discharge pipe 38. The relative position of the grooves 51 of the first connecting seat 48 and the second connecting seat 50 is adjusted by the positioning bolt 49, changing the angle of the float 53. The needle rod 54 moves with the long rod 52, puncturing air bubbles on the slurry surface. Beneficial effects: Automatic control maintains a constant slurry level in the immersion tank 8; the needle rod 54 effectively breaks air bubbles, ensuring consistent immersion coating; the structure is flexible and adaptable to different slurry level requirements.

[0054] like Figure 14-16As shown in Embodiment 3, unlike Embodiment 1, the stirring paddle 14 includes a housing 55 disposed on the bottom surface of the stirring rod 11. The housing 55 has a cavity 56 inside. Three rotating seats 57 are rotatably connected to the side wall of the housing 55. A second blade 58 is connected to the rotating seat 57 located outside the housing 55. The second blade 58 is semi-circular in shape. A second shaft 59 is connected to the rotating seat 57 located inside the housing 55. The second shaft 59 is located at an eccentric position on the rotating shaft. A first connecting rod 60 is ball-jointed on the second shaft 59. The stirring rod 11 is a hollow tube structure. An adjusting rod 61 is rotatably connected to the center of the stirring rod 11. A screw head 62 is connected to the upper end of the adjusting rod 61. The lower end of the adjusting rod 61 is rotatably connected to the housing 55. A screw tube 63 is connected to the side wall of the adjusting rod 61 located inside the housing 55. An adjusting seat 64 is threadedly connected to the screw tube 63. Three ear seats 65 are connected to the outer side wall of the adjusting seat 64. The ear seats 65 are rotatably connected to the first connecting rod 60. Technical problems solved: Traditional agitator 14 has a fixed stirring angle, making it impossible to adjust the stirring range according to the slurry state, resulting in insufficient stirring uniformity. Movement process: The screw head 62 drives the adjusting rod 61 to rotate, which in turn drives the screw tube 63 to rotate. The screw tube 63 is threaded into the adjusting seat 64, causing the adjusting seat 64 to move axially along the adjusting rod 61. The adjusting seat 64 pulls the first connecting rod 60 through the lug 65, which in turn drives the rotating seat 57 to rotate, thereby adjusting the tilt angle of the second blade 58. Beneficial effects: The stirring angle and range of the second blade 58 can be flexibly adjusted to meet the stirring needs of slurries of different viscosities, improving the stirring uniformity and enhancing the stirring effect.

[0055] like Figure 17-19As shown in Example 4, further considering the following problems with existing dip-coating equipment: 1. Difficulty in controlling coating thickness: The shape of the magnet (edges / corners are prone to accumulation), the pulling speed, the viscosity of the slurry, and the drying speed all affect uniformity. Large planar magnets are prone to "retraction" in the central area, leading to uneven thickness. 2. Edge effect: Slurry tends to accumulate at the edges and sharp corners of the magnet, resulting in an excessively thick coating. After diffusion, this may lead to localized oversaturation or microcracks. 3. Solvent evaporation may alter the slurry concentration and viscosity. An automatic dip-coating mechanism using a sintered NdFeB grain boundary diffusion slurry mixing mechanism is proposed. It includes a first guide rod 66 mounted on a frame 1, arranged vertically, with two first guide rods 66 forming a group, for a total of two groups. A first slide block 67 is slidably connected to the first guide rod 66. Two symmetrical first cylinder seats 68 are connected to the top surface of the frame 1, and a first telescopic rod 69 is mounted on the first cylinder seat 68. The piston end of the first telescopic rod 69 is connected to the first slide block 67. Two symmetrically arranged first slide rails 70 are connected to the bottom surface of the first slide block 67, arranged horizontally. The first slide rails 70 are slidably connected to... A second slide 71 is connected to the first slide 67. A tooling fixture 72 is connected to the bottom of the second slide 71, and a dipping fixture 73 is connected to the lower end of the tooling fixture 72. The dipping fixture 73 is used to insert into the dipping tank 8. Two sets of second bearing seats 74 are installed on the first slide 67. One set of second bearing seats 74 is rotatably connected to a lead screw 75, and a moving table 76 is threaded onto the lead screw 75. The lead screw 75 is driven by a third motor 77. The other set of second bearing seats 74 is connected to a second guide rod 78, which is slidably connected to the moving table 76. A connecting seat 79 is connected to the bottom of the moving table 76, and the connecting seat 79 is connected to the tooling fixture 72. This solves the following technical problems: difficulty in controlling coating thickness in existing dipping equipment, uneven coating due to edge effects, and inaccurate control of magnet dipping position and lifting speed. Movement Process: The third motor 77 drives the lead screw 75 to rotate, causing the moving table 76 to move horizontally along the second guide rod 78. The moving table 76, through the connecting seat 79, moves the tooling fixture 72 and the dipping fixture 73 to above the dipping tank 8. The first telescopic rod 69 drives the first slide 67 to descend along the first guide rod 66, allowing the dipping fixture 73 to be inserted into the dipping tank 8. After dipping is completed, the first telescopic rod 69 drives the first slide 67 to ascend, and the lead screw 75 moves the dipping fixture 73 to the drip box 80. Beneficial Effects: Enables automatic dipping of magnets, ensures smooth horizontal and vertical movement, precisely controls the dipping position and lifting speed, reduces edge effects and uneven coating, and improves the automation level of dipping.

[0056] like Figure 18As shown in the figure, as an optimization of Embodiment 4, a dripping box 80 is installed on the base plate 3, and a dripping plate 81 is installed between the dripping box 80 and the immersion tank 8, which can improve material utilization. The technical problem it solves is the waste of excess slurry dripping from the magnet surface after immersion coating, resulting in low material utilization. Movement process: After immersion coating, the magnet moves with the tooling fixture 72 to a position above the dripping box 80 and hovers there. Excess slurry drips down the magnet surface and is guided into the dripping box 80 by the dripping plate 81. Beneficial effects: Recovering excess slurry, improving material utilization, reducing production costs, and avoiding slurry pollution of the equipment environment.

[0057] like Figure 20-21 As shown, as an optimization of Embodiment 4, the tooling fixture 72 includes a first carrier plate 82 connected to the second slide block 71. The top surface of the first carrier plate 82 has a notch 83, which is clearance-fitted with the stirring rod 11. The top surface of the first carrier plate 82 has four sliding grooves 84, arranged in groups of two. The sliding grooves 84 are U-shaped, and the top surface of each groove has a recess 85. A lifting rod 86 is placed on the recess 85. The lifting rod 86 has a T-shaped cross-section, and its lower end is connected to a nut head 87, which is connected to the dipping coating fixture 73. This solves the technical problems of structural interference between the tooling fixture 72 and the stirring rod 11, and the inconvenience of installing and disassembling the dipping coating fixture 73. Movement Process: The lifting rod 86 is placed in the groove 85 of the first carrier plate 82. A sliding groove 84 facilitates quick installation of the lifting rod 86. The notch 83 avoids interference with the stirring rod 11. The lifting rod 86 is connected and fixed to the dipping fixture 73 via a nut head 87. Beneficial Effects: The notch 83 avoids structural interference with the stirring rod 11; the sliding groove 84 facilitates quick installation of the lifting rod 86; the T-shaped lifting rod 86 and nut head 87 make the dipping fixture 73 easy to install and disassemble, improving operational efficiency.

[0058] like Figure 22-25As shown, as an optimization of Embodiment 4, the dip coating fixture 73 includes a first clamping plate 88 connected to a nut head 87. Second clamping plates 90 are connected to both ends of the first clamping plate 88 via hinges 89. The two second clamping plates 90 and the first clamping plate 88 form a U-shaped structure. The inner surfaces of the first clamping plate 88 and the second clamping plate 90 are provided with equally spaced slots 91. Profile plates 92 are inserted into the slots 91. Through holes 93 adapted to the workpiece are provided on the profile plates 92. In this embodiment, a circular magnet is used as an example. A circular magnet is mounted on the through hole 93, and four first semi-circular grooves 94 arranged at equal angles are provided on the through hole 93. Connecting ears 95 are connected to the bottom surface of the second clamping plates 90. Two connecting ears 95 are fixed by long bolts 96. The slurry is dip-coated onto the circular magnet through the gaps between the profile plates 92. The technical problems that can be solved are: the magnet is prone to loosening during the dip coating process, poor compatibility with magnets of different specifications, and insufficient coating uniformity. Movement process: The profile plate 92 is inserted into the slots 91 of the first clamping plate 88 and the second clamping plate 90. The circular magnet is placed into the through hole 93 of the profile plate 92. The second clamping plate 90 is closed by the hinge 89. The long bolt 96 passes through the connecting ear 95 to fix the first clamping plate 88 and the second clamping plate 90. The slurry is applied to the magnet through the gap between the profile plates 92. Beneficial effects: The through hole 93 of the profile plate 92 fixes the magnet, preventing loosening during coating. The U-shaped clamping plate structure is adapted to the circular magnet, ensuring uniform contact of the slurry with the magnet surface, improving coating uniformity, and adapting to magnets of different sizes.

[0059] like Figure 26 As shown, as an optimization of Embodiment 4, a countersunk hole 97 is provided on the first semi-circular groove 94, and a pin 98 is installed in the countersunk hole 97. A ball bearing 99 is connected to the end of the pin 98, and the end face of the ball bearing 99 has an arc-shaped surface. A first spring 100 is installed inside the pin 98, and the first spring 100 is elastically connected to the ball bearing 99. Technical problem solved: The problem of workpiece detachment. Beneficial effect: The ball bearing 99 clamps the workpiece from four directions, preventing the workpiece from detaching during the dipping process.

[0060] like Figure 27 As shown in Embodiment 5, unlike Embodiment 4, the tooling fixture includes a second carrier plate 101 connected to the second slide block 71. Four first insert rods 102 are connected to the bottom surface of the second carrier plate 101, with two first insert rods 102 forming a group. A first insert tube 103 is slidably connected to each first insert rod 102. The first insert tube 103 is fixed to the first insert rod 102 by a positioning pin 104. The first insert tube 103 is connected to the dip coating fixture 73. Beneficial effect: It enables the detachable installation of the dip coating fixture 73.

[0061] like Figures 28-30 , Figure 35As shown, in Embodiment Six, unlike Embodiment Four, the tooling fixture includes a third carrier plate 105 connected to the second slide block 71. A third shaft 106 is connected to the bottom surface of the third carrier plate 105, and the third shaft 106 is perpendicular to the third carrier plate 105. A ball 107 is fixedly connected to the free end of the third shaft 106. A first rotating seat 108 is rotatably connected to the ball 107. A second semi-circular groove 109 is formed on one end face of the first rotating seat 108 for placing the ball 107. A first panel 110 is connected to the other end face of the first rotating seat 108. The first panel 110 is rectangular in shape. Four first insert rods 102 are connected to the end face of the first panel 110. Two first insert rods 102 form a group. A first insert tube 103 is slidably connected to the first insert rod 102. The first insert tube 103 is connected to the first insert rod 102. 02. The first insertion tube 103 is fixed by the positioning pin 104 and connected to the dipping fixture 73. The first panel 110 is connected to the second panel 111 by double-headed bolts 112. In this embodiment, there are four double-headed bolts 112. The second panel 111 is annular in shape, and a second rotating seat 113 is connected to the center of the second panel 111. The end face of the second rotating seat 113 has a flared hole 114 for placing the sphere 107. The bottom surface of the third carrier plate 105 is equipped with a second telescopic rod 115. In this embodiment, there are four second telescopic rods 115, which are arranged at equal angles. The piston end of the second telescopic rod 115 abuts against the second panel 111. The second telescopic rods 115 can push the dipping fixture 73 to produce a multi-angle tilting action to ensure the uniformity of the coating thickness on the product surface. A larger diameter dipping tank 8 can be used to avoid structural interference between the stirring rod 11 and the third carrier plate 105. Technical problems that can be solved: The inability of the dip coating fixture 73 to tilt at multiple angles and the poor consistency of the magnet coating thickness. Movement process: The double-ended bolt 112 connects the first panel 110 and the second panel 111. The second telescopic rod 115 extends and retracts, pushing the second panel 111, which in turn drives the first rotating base 108 to rotate around the sphere 107, achieving multi-angle tilting of the dip coating fixture 73; replacing it with a large-diameter dip tank 8 avoids the stirring rod 11. Beneficial effects: Multi-angle tilting dip coating ensures a consistent coating thickness on the product surface, avoids structural interference with the stirring rod 11, improves equipment adaptability, and expands the application range.

[0062] like Figures 31-34As shown, as an optimization of Embodiment Six, the bottom surface of the first insertion tube 103 is a rounded corner structure, and a hinge seat 116 is rotatably connected to the first insertion tube 103. The hinge seat 116 is connected to the dip coating fixture 73. The bottom surface of the first panel 110 is connected to a base 117, and the bottom surface of the base 117 is hinged with two symmetrically arranged second connecting rods 118; the free end of the second connecting rods 118 is hinged to a fourth support 119, which is connected to the dip coating fixture 73; a second cylinder seat 120 is mounted on the base 117, and the second cylinder seat 120 is U-shaped; a push rod 121 is slidably connected to the horizontal section of the second cylinder seat 120; a third telescopic rod 122 is mounted on the upper end of the push rod 121, and the tail end of the third telescopic rod 122 is connected to the base 117; a second spring 123 is sleeved on the side wall of the push rod 121, and the second spring 123 is elastically connected between the piston end of the second cylinder seat 120 and the third telescopic rod 122; an I-shaped seat 124 is slidably connected to the side wall of the push rod 121 located below the second cylinder seat 120, and the I-shaped seat 124 is fixed to the second cylinder seat 120; Two notches of the mold base 124 are rotatably connected to wedge heads 125, with the inclined surfaces of the two wedge heads 125 facing each other to form a constricted structure. A third connecting rod 126 is installed on the back surface of the wedge head 125, and the free end of the third connecting rod 126 is hinged to the fourth support 119. The side walls of the two wedge heads 125 are rotatably connected to first spring seats 127, which are located at the waist of the wedge head 125. A third spring 128 is installed between the two first spring seats 127, which causes the two wedge heads 125 to move towards each other. A conical apex block 129 is installed at the lower end of the push rod 121. The inclined surface of the conical apex block 129 slides in contact with the two wedge heads 125. The conical apex block 129 is used to open the two wedge heads 125 from the middle, so that the two dip coating fixtures 73 can move in the back-and-forth direction, tilting the dip coating fixtures 73 into the slurry, resulting in better dip coating uniformity and no air bubbles. Technical problems that can be solved: air bubbles are easily generated when the dip coating fixture 73 is tilted and inserted into the slurry; the position adjustment in the front and back directions is inconvenient; and the dip coating uniformity is insufficient. Movement process: The third telescopic rod 122 extends and retracts, driving the push rod 121 to move up and down. The push rod 121 drives the cone-shaped block 129 to move up and down. The cone-shaped block 129 opens or releases the wedge-shaped head 125. The wedge-shaped head 125 pulls the fourth support 119 through the third connecting rod 126, driving the second connecting rod 118 and the dip coating fixture 73 to move back and forth. The hinge seat 116 cooperates with the tilting of the dip coating fixture 73, the second spring 123 buffers the movement of the push rod 121, and the third spring 128 resets the wedge-shaped head 125. Beneficial effects: The tilting and back-and-forth movement of the dip coating fixture 73 when inserted into the slurry avoids air bubbles, improves dip coating uniformity, provides structural buffer protection for the equipment, and ensures stable and reliable operation. In addition, after dip coating is completed, the slight tilt in the front and back directions further ensures a consistent coating thickness on the product surface.

[0063] Working Principle: The sintered NdFeB product is loaded onto the dip coating fixture 73, which is mounted on the tooling fixture 72. The lead screw 75 and the moving table 76 move the dip coating fixture 73 above the dip tank 8. The first telescopic rod 69 descends, and the motor of the agitator 14 in the dip tank 8 stops, allowing the pre-treated magnet to be slowly and uniformly immersed in the slurry, avoiding the formation of air bubbles. The magnet remains in the slurry for several seconds to tens of seconds to ensure thorough wetting. After dip coating, the first telescopic rod 69 ascends, requiring a uniform and stable vertical lift of the magnet (typically 0.1-10 mm / s). The lifting speed is a key parameter for controlling the coating thickness. The motor of the agitator 14 in the dip tank 8 starts, and the lead screw 75 and the moving table 76 move the tooling fixture 72 to the starting position (at the drip box 80), pausing briefly to allow excess slurry to drip off naturally, reducing edge accumulation. Once the stirring paddle 14 in the immersion tank 8 reaches the set speed and the drip control is completed, replace the immersion coating tool 73 and repeat the above steps.

[0064] Although the present invention has been described in detail with reference to the foregoing examples, those skilled in the art can still make and modify the technical solutions described in the foregoing embodiments, or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A mixing mechanism for sintered NdFeB grain boundary diffusion slurry, characterized in that, Includes a frame (1), a base plate (3) connected to the lower layer of the frame (1), a base (4) mounted on the base plate (3), and a feeding bucket (5) mounted on the base (4); a first discharge pipe (6) is mounted on the lower side wall of the feeding bucket (5), and a valve (7) is mounted on the first discharge pipe (6); the first discharge pipe (6) is used to convey slurry to the immersion tank (8); the immersion tank (8) is mounted on the base plate (3); a first bearing plate (9) is mounted on the top surface of the frame (1), and two first bearing seats (10) are mounted on the first bearing plate (9), with a stirring rod (11) rotatably connected to the first bearing seat (10); the stirring rod (11) is connected to a first motor (13) through a worm gear mechanism (12); the stirring rod ( 11) is equipped with a stirring paddle (14) at its lower end. The stirring paddle (14) includes a first support (15) and a second support (16) on the stirring rod (11). There are three first supports (15) and second supports (16). The second support (16) is located in the gap between adjacent first supports (15). A first support rod (17) is fixedly connected to the first support (15). A second support rod (20) is rotatably connected to the second support (16). A column (18) is connected to the top surface of the first support rod (17) and the second support rod (20). A first blade (19) is connected to the top of the column (18). A reset spring (21) is connected at the angle between the second support rod (20) and the first support rod (17).

2. The sintered NdFeB grain boundary diffusion slurry mixing mechanism according to claim 1, characterized in that, A vertical rod (22) is connected to the bottom surface of the immersion tank (8), and an outer tank (23) is connected to the lower end of the vertical rod (22). There is a receiving gap (24) between the outer tank (23) and the immersion tank (8). A ring cover (25) is connected to the top surface of the outer tank (23). A thermostatic component (26) is installed in the receiving gap (24). The thermostatic component (26) includes a ring seat (27) provided on the inner wall of the outer tank (23). A heat dissipation tank (28) is connected to the ring seat (27). The side wall of the heat dissipation tank (28) has an equal angle. The heat exchange holes (29) are arranged at equal intervals from top to bottom. The top surface of the heat exchange tank (28) is provided with heat exchange channels (30) located between the heat exchange holes (29). The adjacent heat exchange channels (30) on the bottom surface of the heat exchange tank (28) are connected by a first connecting pipe (31). Two of the heat exchange channels (30) on the top surface of the heat exchange tank (28) are respectively connected to the liquid inlet pipe (32) and the liquid outlet pipe (33) extending to the outside of the outer tank (23). The remaining adjacent heat exchange channels (30) are connected by a second connecting pipe (34).

3. The sintered NdFeB grain boundary diffusion slurry mixing mechanism according to claim 1, characterized in that, A guide rod (35) is slidably connected to the first discharge pipe (6). The upper end of the guide rod (35) has a limiting head (36), and the lower end of the guide rod (35) extends into the immersion tank (8).

4. The sintered NdFeB grain boundary diffusion slurry mixing mechanism according to claim 1, characterized in that, The lower side wall of the feeding hopper (5) is equipped with a second discharge pipe (37), which is horizontally arranged. A third discharge pipe (38) is connected to the side wall of the second discharge pipe (37), which is vertically arranged. A valve core (39) is slidably connected inside the second discharge pipe (37). The valve core (39) is used to control the opening and closing of the third discharge pipe (38). A sealing ring (40) is connected to the side wall of the valve core (39), and a sealing ring (41) is connected to the side wall of the valve core (39). The sealing ring (41) is elastically fitted with the inner wall of the second discharge pipe (37). A push rod (42) is connected to the valve core (39). A top head (43) is connected to the push rod (42) located outside the second discharge pipe (37). A spring is sleeved on the push rod (42). The spring is elastically connected between the top head (43) and the valve core (39). Between; a lever plate (44) is slidably connected to the top head (43), and the lever plate (44) has a rounded groove (45) that is slidably adapted to the top head (43); a first shaft (46) is rotatably connected to the middle of the lever plate (44), and a third support (47) is connected to the first shaft (46), and the third support (47) is connected to the side wall of the third discharge pipe (38); a first connecting seat (48) is connected to the lower end of the lever plate (44), and a second connecting seat (50) is connected to the first connecting seat (48) by a positioning bolt (49), and the opposite surfaces of the first connecting seat (48) and the second connecting seat (50) have toothed grooves (51); a long rod (52) is connected to the side wall of the second connecting seat (50), and a float (53) is threaded to the lower end of the long rod (52); and needle rods (54) arranged at equal angles are connected to the side wall of the long rod (52).

5. The sintered NdFeB grain boundary diffusion slurry mixing mechanism according to claim 1, characterized in that, The stirring paddle (14) includes a housing (55) disposed on the bottom surface of the stirring rod (11). The housing (55) has a cavity (56) inside. Three rotating seats (57) are rotatably connected to the side wall of the housing (55). A second blade (58) is connected to the rotating seat (57) located outside the housing (55). A second shaft (59) is connected to the rotating seat (57) located inside the housing (55). The second shaft (59) is located at an eccentric position on the rotating seat (57). A first connecting rod is ball-jointed on the second shaft (59). 60), the stirring rod (11) is a hollow tube structure. The center of the stirring rod (11) is rotatably connected to the adjusting rod (61). The upper end of the adjusting rod (61) is connected to the screw head (62). The lower end of the adjusting rod (61) is rotatably connected to the shell (55). The side wall of the adjusting rod (61) located inside the shell (55) is connected to the screw tube (63). The adjusting seat (64) is threaded on the screw tube (63). The outer side wall of the adjusting seat (64) is connected to three ear seats (65). The ear seats (65) are rotatably connected to the first connecting rod (60).

6. An automatic dip-coating mechanism employing the sintered NdFeB grain boundary diffusion slurry mixing mechanism according to any one of claims 1-5, characterized in that, The system includes a first guide rod (66) mounted on the frame (1), with two first guide rods (66) forming a group, and a total of two groups of first guide rods (66). A first slide block (67) is slidably connected to the first guide rod (66). Two symmetrical first cylinder seats (68) are connected to the top surface of the frame (1). A first telescopic rod (69) is mounted on the first cylinder seat (68), and the piston end of the first telescopic rod (69) is connected to the first slide block (67). Two symmetrically arranged first slide rails (70) are connected to the bottom surface of the first slide block (67). The first slide rails (70) are horizontally arranged, and a second slide block (71) is slidably connected to the first slide rails (70). A tooling is connected to the bottom surface of the second slide block (71). The lower end of the carrier (72) is connected to the dipping fixture (73), which is used to insert into the dipping barrel (8); two sets of second bearing seats (74) are installed on the first slide (67), one set of second bearing seats (74) is rotatably connected to a lead screw (75), and a moving table (76) is threadedly connected to the lead screw (75). The lead screw (75) is driven by a third motor (77). The other set of second bearing seats (74) is connected to a second guide rod (78), which is slidably connected to the moving table (76). The bottom surface of the moving table (76) is connected to a connecting seat (79), which is connected to the carrier (72).

7. The automatic dip-coating mechanism according to claim 6, characterized in that, A drip box (80) is installed on the base plate (3), and a drip plate (81) is installed between the drip box (80) and the immersion tank (8).

8. The automatic dip-coating mechanism according to claim 6, characterized in that, The tooling fixture (72) includes a first carrier plate (82) connected to the second slide (71). The top surface of the first carrier plate (82) is provided with a notch (83), which is in clearance fit with the stirring rod (11). The top surface of the first carrier plate (82) is provided with four sliding grooves (84), which are in groups of two. The sliding grooves (84) are U-shaped, and the top surface of the sliding grooves (84) is provided with a groove (85). A lifting rod (86) is placed on the groove (85). The cross-sectional shape of the lifting rod (86) is T-shaped. The lower end of the lifting rod (86) is connected to a nut head (87), which is connected to the dipping tooling (73).

9. The automatic dip-coating mechanism according to claim 8, characterized in that, The dip coating fixture (73) includes a first clamping plate (88) connected to a nut head (87). The two ends of the first clamping plate (88) are connected to second clamping plates (90) via hinges (89). The two second clamping plates (90) and the first clamping plate (88) form a U-shaped structure. The inner sides of the first clamping plate (88) and the second clamping plate (90) are provided with slots (91) arranged at equal intervals. A profile plate (92) is inserted into the slot (91). The profile plate (92) is provided with through holes (93) adapted to the workpiece. The through holes (93) are provided with four first semi-circular grooves (94) arranged at equal angles. The bottom surface of the second clamping plate (90) is connected to a connecting ear (95). The two connecting ears (95) are fixed by long bolts (96).

10. The automatic dip-coating mechanism according to claim 9, characterized in that, The first semi-circular groove (94) has a countersunk hole (97), a pin (98) is installed in the countersunk hole (97), a ball (99) is connected to the end of the pin (98), the end face of the ball (99) has an arc surface, a first spring (100) is installed in the pin (98), and the first spring (100) is elastically connected to the ball (99).

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