Grinding device for rare earth permanent magnet multi-pole ring

Abstract

The application belongs to the technical field of grinding equipment, and discloses a rare earth permanent magnet multi-pole ring grinding equipment which comprises a water tank, a rotating polishing assembly arranged in the water tank and an automatic adaptive contact assembly arranged on the rotating polishing assembly. The rotating polishing assembly comprises a rotating transmission cylinder which is rotatably arranged on the inner wall of the bottom of the water tank and an impeller which is fixedly arranged in the rotating transmission cylinder. The polishing pipe is of a telescopic type and is driven by water pressure in a self-adaptive mode. The polishing pipe can be flexibly inserted into the narrow space of the inner ring of the multi-pole ring and closely adhere to the curved surface to realize efficient and dead-angle-free polishing. The circulating water cooling and the isolated heat dissipation structure are combined. The water flow is quickly guided out of the friction heat in the polishing pipe. The closed-loop cooling is formed by the external heat dissipation fins and the fan. The heat accumulation is effectively inhibited. The magnetic performance is prevented from being attenuated. The closed water circulation and the non-contact heat dissipation design ensure that the water does not directly contact the magnet, the oxidation and rust are prevented, and the polishing quality and the material stability are remarkably improved.

Description

Technical Field

[0001] This invention belongs to the field of grinding equipment technology, and particularly relates to a grinding equipment for rare earth permanent magnet multipole rings. Background Technology

[0002] Rare earth permanent magnet materials possess excellent magnetic properties, such as high remanence, high coercivity, and high energy product. From drive motors in new energy vehicles to core components of wind turbines, and even magnetic resonance imaging systems in high-end medical equipment, rare earth permanent magnet multipole rings are key components whose performance directly determines the operating efficiency and stability of related equipment. During the manufacturing process of rare earth permanent magnet multipole rings, they need to be polished to ensure precision and performance.

[0003] (1) The outer circle is open, making it easy to operate the polishing tools, while the inner circle is limited in space, making it difficult for conventional equipment to enter, and thus it is impossible to balance the polishing effect with the operability of the narrow space.

[0004] (2) The grinding head rubs tightly against the inner ring, making it difficult to dissipate heat. Furthermore, the rare earth permanent magnet material has low thermal conductivity, causing heat accumulation and concentrated heat effects. Therefore, it is necessary to dissipate heat during the grinding process. Traditional equipment often uses a single water cooling or air cooling method, but air cooling is difficult to quickly remove the concentrated heat in the grinding area.

[0005] Common rare-earth permanent magnet materials, such as neodymium iron boron materials, are prone to oxidation reactions when using conventional water spraying for heat dissipation. This generates oxides such as rust, which damages the crystal structure of the magnet, thereby reducing its magnetic properties and affecting the final performance of the multipole ring.

[0006] Therefore, a grinding machine that can flexibly adapt to different sizes and has good heat dissipation is needed to solve the above problems. Summary of the Invention

[0007] To address the above issues and overcome the shortcomings of existing technologies, this invention provides a grinding device for rare-earth permanent magnet multipole rings. It employs a telescopic grinding tube with adaptive water pressure drive, allowing it to flexibly extend into the narrow space within the multipole ring and closely fit the inner ring for efficient, dead-angle-free grinding. Combined with a circulating water cooling system and an isolated heat dissipation structure, water flows through the grinding tube to quickly dissipate frictional heat. External heat dissipation fins and a fan form a closed-loop cooling system, effectively suppressing heat accumulation and preventing magnetic performance degradation. The closed water circulation and non-contact heat dissipation design ensure that water does not directly contact the magnet, preventing oxidation and rust, and significantly improving grinding quality and material stability.

[0008] The technical solution adopted in this invention is as follows: A grinding device for rare earth permanent magnet multipole rings includes a water tank, a rotary grinding assembly disposed in the water tank, and an automatic adaptation contact assembly disposed on the rotary grinding assembly. The permanent magnet multipole ring body is detachably disposed on the outer edge of the upper side of the water tank. The rotary grinding assembly includes a rotary transmission cylinder rotatably disposed on the inner wall of the bottom of the water tank, an impeller fixedly disposed in the rotary transmission cylinder, a telescopic pipe fixedly and through connected to the upper side of the side wall of the rotary transmission cylinder, and a grinding pipe fixedly and through connected to the other end of the telescopic pipe.

[0009] The automatic adaptation contact assembly includes a mounting cylinder coaxially fixedly connected to the outer wall of the top of the rotating transmission cylinder and a piston cylinder horizontally fixedly disposed on the inner wall of the mounting cylinder. A piston rod is movably and tightly disposed on the inner wall of the piston cylinder, and the other end of the piston rod is fixedly connected to the outer wall of the grinding tube. The piston cylinder and the mounting cylinder are connected in a through connection.

[0010] As a preferred technical solution of this invention, a water pump is fixedly installed on the outer wall of the top of the mounting cylinder. The water pump's suction end is connected to the grinding pipe, and the water pump's outlet end is connected through the top wall of the mounting cylinder. The water pump's injection volume into the mounting cylinder per unit time is greater than the water output volume of the mounting cylinder entering the sliding pipe per unit time.

[0011] As a preferred technical solution of this invention, a cooling fan is rotatably provided on the bottom wall of the water tank. The cooling fan is coaxially and fixedly connected to the rotating transmission cylinder. Cooling fins are fixedly provided on the bottom wall of the water tank, and the cooling fins correspond to the cooling fan.

[0012] As a preferred technical solution of this invention, a mounting bracket is fixedly provided on the outer wall of the water tank, an electric push rod is fixedly provided on the inner wall of the mounting bracket, and a clamping plate is fixedly provided on the output end of the electric push rod.

[0013] As a preferred technical solution of this invention, a connecting piston is movably and closely fitted inside the mounting cylinder, and a sliding tube is slidably provided through the lower wall of the mounting cylinder, with the upper end of the sliding tube fixed and connected to the connecting piston.

[0014] The beneficial effects of the present invention after adopting the above structure are as follows:

[0015] (1) By using a telescopic grinding tube and water pressure adaptive drive, efficient grinding in the narrow inner space can be achieved, solving the problem of limited operation of conventional equipment; the grinding tube is connected to the rotating transmission cylinder through the telescopic tube, and with the radial telescopic design of the piston rod, it can flexibly extend into the narrow space of the inner ring of the multi-stage ring; the adaptive adjustment mechanism of water pressure drive can make the outer wall of the grinding tube fit tightly against the inner ring, and maintain uniform contact during the rotation grinding process, avoiding grinding dead corners caused by space limitation; compared with the shortcomings of traditional equipment that are difficult to enter the inner ring, this design takes into account both the operability and grinding effect in narrow space.

[0016] (2) The circulating water cooling and isolation heat dissipation structure is adopted to enhance heat dissipation and avoid heat accumulation, thus solving the problem of heat impact caused by low thermal conductivity. The circulating water flows directly through the inside of the grinding tube and exchanges heat with the grinding zone through the tube wall, quickly removing the frictional heat. At the same time, the linkage design of the rotating transmission cylinder and the impeller accelerates the water circulation. Combined with the heat dissipation fins and fan outside the water tank, a closed loop of "heat absorption in the grinding zone, water conduction, and external heat dissipation" is formed. This mechanism is designed to effectively reduce the temperature of the grinding zone due to the low thermal conductivity of rare earth permanent magnet materials, thus avoiding the magnetic performance decay caused by heat accumulation.

[0017] (3) Based on closed water circulation and non-contact heat dissipation, water is prevented from directly contacting the magnet, thus solving the oxidation risk problem; the cooling water flows through the inside of the grinding tube and the equipment circulation pipeline, forming a physical isolation with the rare earth permanent magnet multipole ring, and heat is dissipated indirectly through the wall of the grinding tube, avoiding direct contact of water caused by conventional water spraying. At the same time, it ensures that the magnet surface is always dry, effectively avoiding the oxidation reaction of materials such as neodymium iron boron when exposed to water, and improving the magnetic performance retention rate. Attached Figure Description

[0018] The accompanying drawings are provided to further understand the present invention and form part of the specification. They are used together with the embodiments of the present invention to explain the invention and do not constitute a limitation thereof.

[0019] Figure 1 This is a schematic diagram of the working state of a grinding device for rare earth permanent magnet multipole rings proposed in this invention. Figure 1 ;

[0020] Figure 2 This is a schematic diagram of the working state of a grinding device for rare earth permanent magnet multipole rings proposed in this invention. Figure 2 ;

[0021] Figure 3 This is a cross-sectional view of the structure of a grinding device for a rare earth permanent magnet multipole ring under working conditions, as proposed in this invention.

[0022] Figure 4 This is a schematic diagram of the connection structure of the automatically adapting contact component proposed in this invention;

[0023] Figure 5 This is a schematic diagram of the connection structure of the rotary grinding assembly proposed in this invention;

[0024] Figure 6 This is a schematic diagram showing the positional relationship between the sliding tube and the mounting cylinder proposed in this invention;

[0025] Figure 7 This is a schematic diagram showing the positional relationship between the rotating transmission cylinder and the mounting cylinder proposed in this invention;

[0026] Figure 8This is a schematic diagram of the connection relationship of the dual-axis motor in Embodiment 2 of the present invention.

[0027] In the attached diagram: 1. Water tank; 2. Automatic adaptation contact assembly; 3. Rotary grinding assembly; 4. Water pump; 5. Connecting pipe; 6. Electric actuator; 7. Mounting bracket; 8. Clamping plate; 9. Heat dissipation fins; 10. Cooling fan; 11. Connecting piston; 12. Piston cylinder; 13. Piston rod; 14. Through hole; 15. Sliding tube; 16. Mounting cylinder; 17. Telescopic tube; 18. Grinding tube; 19. Connecting shaft; 20. Water suction hole; 21. Impeller; 22. Rotary transmission cylinder; 23. Rubber pad; 24. Dual-axis motor; 25. Permanent magnet multi-stage ring body. Detailed Implementation

[0028] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0029] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0030] Example 1: As Figures 1-7As shown, a grinding device for rare earth permanent magnet multipole rings includes a water tank 1, a rotary grinding assembly 3 disposed within the water tank 1, and an automatic adaptation contact assembly 2 disposed on the rotary grinding assembly 3. A rubber pad 23 is fixedly provided along the outer edge of the top of the water tank 1, and a permanent magnet multipole ring body 25 is detachably mounted on the rubber pad 23. The rotary grinding assembly 3 includes a rotary transmission cylinder 22 rotatably disposed on the inner wall of the bottom of the water tank 1, a connecting shaft 19 coaxially fixed within the rotary transmission cylinder 22, an impeller 21 fixedly disposed on the connecting shaft 19, a telescopic tube 17 fixedly and permeatingly connected to the upper side wall of the rotary transmission cylinder 22, and a grinding tube 18 fixedly and permeatingly connected to the other end of the telescopic tube 17. A water suction hole 20 is provided through the lower side wall of the rotary transmission cylinder 22. The grinding tube... The outer wall of the 18 is provided with a polishing layer; the automatic adaptation contact assembly 2 is provided on the top outer wall of the rotating transmission cylinder 22. The automatic adaptation contact assembly 2 includes a mounting cylinder 16 coaxially fixedly connected to the top outer wall of the rotating transmission cylinder 22, a piston cylinder 12 horizontally fixedly disposed on the inner wall of the mounting cylinder 16, and a piston rod 13 that is movably and tightly fitted to the side wall of the mounting cylinder 16. One end of the piston rod 13 is movably and tightly fitted to the inner wall of the piston cylinder 12, and the other end of the piston rod 13 is fixedly connected to the outer wall of the polishing tube 18. A connecting piston 11 is movably and tightly fitted inside the mounting cylinder 16. A sliding tube 15 is slidably provided through the lower wall of the mounting cylinder 16. The upper end of the sliding tube 15 is fixedly and through the connecting piston 11. A through hole 14 is provided through the side wall of the piston cylinder 12.

[0031] A water pump 4 is fixedly installed on the top outer wall of the mounting cylinder 16. The suction end of the water pump 4 is connected to a connecting pipe 5. The connecting pipe 5 is a flexible connecting pipe. The free end of the connecting pipe 5 is connected to the top wall of the grinding pipe 18. The outlet end of the water pump 4 is connected to the top wall of the mounting cylinder 16. The water injection volume of the water pump 4 into the mounting cylinder 16 per unit time is greater than the water output volume of the mounting cylinder 16 into the sliding pipe 15 per unit time.

[0032] A cooling fan 10 is rotatably mounted on the bottom wall of the water tank 1. The cooling fan 10 is coaxially and fixedly connected to the rotating transmission cylinder 22. A cooling fin 9 is fixedly mounted on the bottom wall of the water tank 1. The cooling fin 9 corresponds to the cooling fan 10. A mounting bracket 7 is fixedly mounted on the outer wall of the water tank 1. An electric push rod 6 is fixedly mounted on the inner wall of the mounting bracket 7. A clamping plate 8 is fixedly mounted on the output end of the electric push rod 6. The clamping plate 8 corresponds to the outer side wall of the permanent magnet multipole ring 25.

[0033] In practical use, first place the permanent magnet multi-stage ring body 25 to be polished on the rubber pad 23 and put it on the outside of the mounting cylinder 16 and the polishing tube 18. Start the electric push rod 6. The electric push rod 6 drives the clamping plate 8 to move inward. Use the clamping plate 8 to clamp and fix the permanent magnet multi-stage ring body 25. Then start the water pump 4. At this time, the water in the water tank 1 enters the rotating transmission cylinder 22 through the water suction hole 20, and then flows through the telescopic pipe 17, the polishing tube 18 and the connecting pipe 5 in sequence before entering the mounting cylinder 16. Finally, it flows back to the water tank 1 through the sliding pipe 15 to form a closed-loop water circulation.

[0034] Because the water injection volume into the mounting cylinder 16 of the water pump 4 is greater than the water output volume of the mounting cylinder 16 through the sliding pipe 15, the water pressure inside the mounting cylinder 16 continues to rise, driving the connecting piston 11 to move downward along the inner wall of the mounting cylinder 16. The downward movement of the connecting piston 11 causes the internal volume of the piston cylinder 12 to shrink, and its internal air pressure increases accordingly, thereby pushing the piston rod 13 to extend outward along the side wall of the mounting cylinder 16 until the outer wall of the grinding tube 18 is in close contact with the inner ring of the permanent magnet multi-stage ring body 25, completing the adaptive radial adaptation.

[0035] As the water continues to flow through the rotating transmission cylinder 22, the water flow impacts the impeller 21 and drives it to rotate. The impeller 21 transmits power to the rotating transmission cylinder 22 through the connecting shaft 19, which in turn drives the telescopic tube 17 and the grinding tube 18 to rotate synchronously. At this time, the grinding layer on the outer wall of the grinding tube 18 and the inner ring of the permanent magnet multi-level ring body 25 generate relative motion, thereby realizing the grinding process on the surface of the inner ring.

[0036] During the grinding process, the heat generated by the friction between the permanent magnet multi-stage ring body 25 and the grinding tube 18 is continuously carried away by the flow of circulating water inside the grinding tube 18, achieving synchronous heat dissipation and cooling of the grinding tube 18 and the permanent magnet multi-stage ring body 25. At the same time, the rotation of the impeller 21 drives the cooling fan 10 to rotate synchronously, and by forcibly blowing air onto the heat dissipation fins 9, the heat dissipation of the water inside the water tank 1 is further accelerated, ensuring the thermal stability of the equipment under long-term high-load operation.

[0037] Example 2, as Figure 8 As shown, the difference between this embodiment and the aforementioned embodiment one is that: a dual-axis motor 24 is fixedly installed on the outer wall of the bottom of the water tank 1 (e.g., Figure 8 As shown in the figure, one of the output ends of the dual-axis motor 24 is coaxially and fixedly connected to the rotating transmission cylinder 22, and the other output end of the dual-axis motor 24 is fixedly equipped with a cooling fan 10.

[0038] In practical use, the dual-axis motor 24 is started, which drives the cooling fan 10 and the rotating transmission cylinder 22 to rotate. The cooling fan 10 forces air to the heat dissipation fins 9 to achieve the heat dissipation effect on the water inside the water tank 1. At the same time, the rotating transmission cylinder 22 drives the telescopic tube 17 and the grinding tube 18 to rotate, thereby grinding the inner surface of the permanent magnet multi-level ring body 25. The remaining steps are the same as the motion process in Embodiment 1, so that heat can be dissipated at the same time during the grinding process, effectively avoiding the magnetic performance attenuation caused by heat accumulation.

[0039] In summary, if a person skilled in the art, inspired by this invention, designs a similar structure and embodiment without departing from the spirit of the invention, such design should fall within the scope of protection of this invention.

Claims

1. A grinding device for a rare earth permanent magnetic multi-pole ring, comprising a water tank (1) and a rubber pad (23) fixedly arranged on the outer edge of the top of the water tank (1), and a permanent magnetic multi-pole ring body (25) detachably arranged on the outer edge of the upper side of the water tank (1), characterized in that: Also include the rotating polishing assembly (3) and the automatic adaptive contact assembly (2) set in the water tank (1), the rotating polishing assembly (3) includes the rotating transmission cylinder (22) which is rotatably arranged in the inner wall of the bottom of the water tank (1), the impeller (21) which is fixedly arranged in the rotating transmission cylinder (22), the telescopic pipe (17) which is fixedly and throughly connected on the upper side of the side wall of the rotating transmission cylinder (22), and the polishing pipe (18) which is fixedly and throughly connected on the other end of the telescopic pipe (17); The automatic adaptive contact assembly (2) includes the mounting cylinder (16) which is coaxially fixedly connected on the top outer wall of the rotating transmission cylinder (22), and the piston cylinder (12) which is horizontally fixedly arranged on the inner wall of the mounting cylinder (16), the inner wall of the piston cylinder (12) movably and closely arranged with the piston rod (13), the other end of the piston rod (13) fixedly connected with the outer wall of the polishing pipe (18), and the piston cylinder (12) throughly connected with the mounting cylinder (16); The lower side of the side wall of the rotating transmission cylinder (22) is throughly provided with the water suction hole (20), the outer wall of the polishing pipe (18) is provided with a polishing layer, the side wall of the piston cylinder (12) is throughly provided with the through hole (14), the top outer wall of the mounting cylinder (16) is fixedly provided with the water pump (4), the water suction end of the water pump (4) is connected with the pipeline of the polishing pipe (18), the water outlet end of the water pump (4) is throughly connected with the top wall of the mounting cylinder (16), the water suction end of the water pump (4) is throughly connected with the connecting pipe (5), the connecting pipe (5) is a flexible connecting pipe, the free end of the connecting pipe (5) is throughly connected with the top wall of the polishing pipe (18), and the water outlet end of the water pump (4) is throughly connected with the top wall of the mounting cylinder (16); The inner wall of the mounting cylinder (16) movably and closely arranged with the connecting piston (11), and the lower wall of the mounting cylinder (16) throughly and slidably arranged with the sliding pipe (15), the upper end of the sliding pipe (15) fixedly and throughly connected with the connecting piston (11); The water injection amount of the water pump (4) into the mounting cylinder (16) per unit time is greater than the water outlet amount of the mounting cylinder (16) into the sliding pipe (15) per unit time.

2. The grinding apparatus of a rare earth permanent magnetic multipole ring according to claim 1, characterized in that: The bottom wall of the water tank (1) is vertically rotatably provided with the heat dissipation fan (10), the heat dissipation fan (10) is coaxially fixedly connected with the rotating transmission cylinder (22), and the bottom wall of the water tank (1) is fixedly provided with the heat dissipation fin (9) corresponding to the heat dissipation fan (10).

3. The grinding apparatus of claim 1, wherein: The outer wall of the water tank (1) is fixedly provided with the mounting bracket (7), the inner wall of the mounting bracket (7) is fixedly provided with the electric push rod (6), and the output end of the electric push rod (6) is fixedly provided with the clamping plate (8).

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