Pickling device for molybdenum-copper heat sink material production

Abstract

The invention discloses a pickling device for molybdenum-copper heat sink material production, which comprises a bottom plate, the bottom of the bottom plate is fixedly connected with a plurality of annular and uniformly distributed non-slip mats, the non-slip mats are made of rubber materials, the top of the bottom plate is fixedly connected with a plurality of support rods, the tops of the support rods are fixedly connected with a pickling tank, and the pickling tank is fixedly connected with the bottom of the bottom plate. A supporting seat is fixedly connected to the top of the pickling tank, a support is fixedly connected to the top of the supporting seat, two symmetrically-distributed air cylinders are fixedly installed at the top of the support, the output ends of the air cylinders are in sliding connection with the support, a cover plate is fixedly connected to the lower ends of the output ends of the air cylinders, and the cover plate is in sliding connection with the pickling tank. And a motor is fixedly mounted at the top of the cover plate. The invention relates to a pickling device for molybdenum-copper heat sink material production. The pickling device has the characteristics that a material is in rapid and uniform contact with a pickling solution, and residual impurities in the device can be conveniently cleaned.

Description

Technical Field

[0001] This invention belongs to the technical field of pickling equipment, specifically a pickling equipment for producing molybdenum-copper heat sink materials. Background Technology

[0002] Molybdenum-copper heat sinks are high-end thermal management materials composed of molybdenum and copper through processes such as powder metallurgy and diffusion welding. Their core advantage lies in combining the high thermal conductivity and low coefficient of thermal expansion of molybdenum with the high thermal conductivity of copper, precisely matching the stringent requirements for heat dissipation efficiency and dimensional stability in semiconductors and power devices for new energy vehicles. They are primarily used to solve heat conduction problems in high heat flux density scenarios, such as chip packaging, 5G base station power amplifiers, and IGBT modules for new energy vehicles. They can quickly dissipate the heat generated during device operation, preventing performance degradation or shortened lifespan due to localized overheating. Simultaneously, their coefficient of thermal expansion is highly compatible with substrates such as ceramics and silicon, reducing interfacial stress under thermal cycling and ensuring long-term stable operation of devices. They are a key foundational material supporting the development of high-end electronic information and new energy industries.

[0003] The pickling equipment used in the production of molybdenum-copper heat sink materials is a specialized device designed to improve the surface quality of these materials. Its core purpose is to remove oxide films, oil stains, and metallic impurities from the material surface, enhancing surface cleanliness and activity, thus laying the foundation for subsequent critical processes such as electroplating and diffusion welding. It ensures that the adhesion between the molybdenum-copper material and the plating layer (such as nickel or gold) meets the required standards, preventing problems such as plating peeling and poor soldering during subsequent device packaging or welding. It is also compatible with different specifications of molybdenum-copper heat sink blanks (such as plates and irregularly shaped parts) to meet the needs of mass production, reducing issues such as decreased heat dissipation efficiency and shortened service life caused by surface defects. Ultimately, it ensures the stable performance of molybdenum-copper heat sink materials in applications such as semiconductor chips and IGBT modules for new energy vehicles.

[0004] In existing technologies, during the use of pickling equipment, the contact between the material and the pickling solution is not rapid and uniform enough, which affects the pickling effect. Furthermore, solid impurities easily remain on the inner wall of the equipment after pickling, making subsequent cleaning inconvenient. Therefore, there is a need to design a pickling device for the production of molybdenum-copper heat sink materials. Summary of the Invention

[0005] The purpose of this invention is to provide an acid pickling apparatus for the production of molybdenum-copper heat sink materials in order to solve the above-mentioned problems, thereby resolving the issues mentioned in the background art.

[0006] To address the above problems, the present invention provides a technical solution:

[0007] A pickling device for producing molybdenum-copper heat sink material includes a base plate. Multiple annular and evenly distributed anti-slip pads, made of rubber, are fixedly connected to the bottom of the base plate. Multiple support rods are fixedly connected to the top of the base plate. A pickling tank is fixedly connected to the top of each support rod. A support base is fixedly connected to the top of the pickling tank. A bracket is fixedly connected to the top of the support base. Two symmetrically distributed cylinders are fixedly mounted on the top of the bracket. The output ends of the cylinders are slidably connected to the bracket. A cover plate is fixedly connected to the lower end of the cylinder output ends. The cover plate is slidably connected to the pickling tank. A motor is fixedly mounted on the top of the cover plate. The output end of the motor is rotatably connected to the cover plate. A rotating seat is fixedly connected to the lower end of the motor output end. A drain port with a valve is provided at the bottom of the pickling tank. A pickling mechanism is provided inside the pickling tank, and a cleaning mechanism is provided on the pickling tank.

[0008] Preferably, a sealing ring is rotatably fitted onto the outer side of the motor output end, and the sealing ring is fixedly connected to the cover plate. The sealing ring is made of rubber. By designing the sealing ring, the connection between the motor output end and the cover plate can be sealed.

[0009] Preferably, the pickling mechanism includes a rotating block, with the rotating block fixedly connected to the bottom of the rotating seat. A connecting seat is rotatably sleeved on the outer side of the rotating block. A first bevel gear is fixedly connected to the bottom of the rotating block, and a second bevel gear meshes with the outer side of the first bevel gear. A rotating shaft is fixedly sleeved inside the second bevel gear and rotatably sleeved inside the connecting seat. A protective cover is provided on the outer sides of both the first and second bevel gears. The protective cover is fixedly connected to the top of the inner wall of the connecting seat. A rotating ring is fixedly sleeved on the outer side of the rotating shaft. A connecting rod is hinged inside the rotating ring and slidably connected to the connecting seat. A fixed rod is fixedly connected to the inner side of the connecting rod. A sliding sleeve is rotatably sleeved on the outer side of the fixed rod. A connecting rod is fixedly connected to the bottom of the sliding sleeve. A support frame is fixedly connected to the bottom of the connecting rod. A material trough is fixedly connected to the lower end of the support frame. The material trough has multiple annular and evenly distributed through holes inside, and a support mesh is provided at the bottom of the material trough. By designing the pickling mechanism, rapid contact pickling of materials and pickling solution can be achieved.

[0010] Preferably, a sealing sleeve is rotatably fitted onto the outer side of the rotating shaft, and the sealing sleeve is fixedly connected to the protective cover. By designing the sealing sleeve, the connection between the rotating shaft and the protective cover can be sealed.

[0011] Preferably, the cleaning mechanism includes a crossbar, with crossbars fixedly connected to both ends of the rotating seat. A connecting sleeve is slidably fitted onto the outer side of the crossbar, and a scraper is fixedly connected to the outer side of the connecting sleeve. The scraper contacts the inner wall of the pickling tank. A guide rod is fixedly connected to the inner wall of the connecting sleeve, and the guide rod is slidably connected to the crossbar. Ball bearings are movably fitted onto the top and bottom of the crossbar, and the ball bearings are slidably connected to the connecting sleeve. A collection groove is contacted at the top of the base plate, and a support frame is slidably fitted inside the collection groove. A filter element is installed inside the support frame, and a magnetic ring is contacted at the bottom of the support frame. The magnetic ring is fixedly connected to the inner wall of the collection groove, and an opening is provided inside the magnetic ring. Two symmetrically distributed handles are fixedly connected to the top of the support frame. This cleaning mechanism facilitates cleaning of the inside of the device.

[0012] Preferably, a spring is provided on the outer side of the guide rod, with one end of the spring fixedly connected to the inner wall of the connecting sleeve and the other end of the spring fixedly connected to the crossbar. By designing the spring, the elastic force of the spring can be applied to the connecting sleeve.

[0013] Preferably, the inner wall of the connecting sleeve is provided with grooves at both the top and bottom, and ball bearings are slidably connected inside both grooves. The grooves allow the ball bearings to slide along them.

[0014] Preferably, the bottom of the support frame is fixedly connected to a plurality of evenly distributed magnetic blocks, which are slidably connected to a magnetic ring and are attracted to each other. By designing the attraction between the magnetic blocks and the magnetic ring, the support frame and the magnetic ring can be connected and fixed.

[0015] The beneficial effects of this invention are as follows: This invention relates to an acid pickling device for the production of molybdenum-copper heat sink materials, which features rapid and uniform contact between the material and the pickling solution, and convenient cleaning of residual impurities inside the device. In specific use, compared with traditional acid pickling devices for the production of molybdenum-copper heat sink materials, this acid pickling device for the production of molybdenum-copper heat sink materials has the following beneficial effects:

[0016] Firstly, by designing the pickling tank, which stores pickling solution, the material can be placed into the pickling solution for pickling by moving the material tank driven by a cylinder. During pickling, the motor can drive the rotating seat and rotating block to rotate, which can realize the rotation of bevel gear one, and then realize the rotation of bevel gear two and the rotating shaft. The rotation of the rotating shaft can push and pull the connecting rod to move, and the movement of the connecting rod can push and pull the sliding sleeve, support frame and material tank to move up and down, which can realize the up and down movement of the material tank inside the pickling tank, which can shake the material inside the pickling tank, so that the material comes into contact with the pickling solution more quickly and evenly, thereby improving the pickling efficiency of the material.

[0017] Secondly, by designing the motor, the output of the motor can drive the crossbar, connecting sleeve, and scraper to rotate. The rotation of the scraper along the inner wall of the pickling tank can scrape off the residual solids on the inner wall of the pickling tank, which facilitates the cleaning of the inside of the pickling tank. Moreover, the scraper is supported by the elastic force of the spring, which can keep the scraper in close contact with the inner wall of the pickling tank, thereby improving the cleaning effect. The pickling solution can be recovered through the collection tank, and impurities can be filtered and purified by the detachable filter element, which facilitates the recycling of the pickling solution. At the same time, the magnetic ring can adsorb and collect metal objects, which is convenient for recycling. Attached Figure Description

[0018] For ease of explanation, the present invention will be described in detail below with reference to specific embodiments and accompanying drawings.

[0019] Figure 1 This is a perspective view of the overall structure of the present invention;

[0020] Figure 2 For the present invention Figure 1 A three-dimensional view of a partial structure of the pickling tank;

[0021] Figure 3 For the present invention Figure 2 A three-dimensional sectional view of the connector structure;

[0022] Figure 4 For the present invention Figure 3 Enlarged view of point A;

[0023] Figure 5 For the present invention Figure 3 The front sectional view of the connecting sleeve;

[0024] Figure 6 For the present invention Figure 1 A three-dimensional sectional view of the collection tank.

[0025] In the diagram: 1. Base plate; 2. Anti-slip mat; 3. Support rod; 4. Pickling tank; 5. Support base; 6. Bracket; 7. Cylinder; 8. Pickling mechanism; 9. Cleaning mechanism; 10. Cover plate; 11. Motor; 12. Sealing ring; 13. Rotating seat; 14. Drain port; 81. Rotating block; 82. Connecting seat; 83. Bevel gear one; 84. Bevel gear two; 85. Rotating shaft; 86. Protective cover; 87. Sealing sleeve; 88. Rotating ring; 89. Connecting... 891. Connecting rod; 892. Fixed rod; 893. Sliding sleeve; 894. Connecting rod; 895. Support frame; 896. Material trough; 897. Through hole; 898. Support mesh; 91. Crossbar; 92. Connecting sleeve; 93. Scraper; 94. Guide rod; 95. Spring; 96. Ball bearing; 97. Slide groove; 98. Collection trough; 99. Support frame; 991. Filter element; 992. Magnetic ring; 993. Magnetic block; 994. Opening; 995. Handle. Detailed Implementation

[0026] like Figure 1-6 As shown, the specific implementation adopts the following technical solution:

[0027] Example:

[0028] A pickling device for producing molybdenum-copper heat sink material includes a base plate 1. Multiple annular and evenly distributed anti-slip pads 2, made of rubber, are fixedly connected to the bottom of the base plate 1. Multiple support rods 3 are fixedly connected to the top of the base plate 1. A pickling tank 4 is fixedly connected to the top of the support rods 3. A support base 5 is fixedly connected to the top of the pickling tank 4. A bracket 6 is fixedly connected to the top of the support base 5. Two symmetrically distributed cylinders 7 are fixedly mounted on the top of the bracket 6. The output ends of the cylinders 7 are slidably connected to the bracket 6. A cover plate 10 is fixedly connected to the lower end of the output end of the cylinders 7. The cover plate 10 is slidably connected to the pickling tank 4. The cover plate 10 is connected to the top of the cover plate 10. A motor 11 is fixedly mounted on the top of the cover plate 10. The output end of the motor 11 is rotatably connected to the cover plate 10. A sealing ring 12 is rotatably sleeved on the outer side of the output end of the motor 11. The sealing ring 12 is fixedly connected to the cover plate 10. The sealing ring 12 is made of rubber. By designing the sealing ring 12, the connection between the output end of the motor 11 and the cover plate 10 can be sealed. A rotating seat 13 is fixedly connected to the lower end of the output end of the motor 11. A drain port 14 is provided at the bottom of the pickling tank 4, and a valve is provided on the drain port 14. An pickling mechanism 8 is provided inside the pickling tank 4, and a cleaning mechanism 9 is provided on the pickling tank 4.

[0029] The pickling mechanism 8 includes a rotating block 81. The rotating block 81 is fixedly connected to the bottom of the rotating seat 13. A connecting seat 82 is rotatably sleeved on the outer side of the rotating block 81. A first bevel gear 83 is fixedly connected to the bottom of the rotating block 81. A second bevel gear 84 meshes with the outer side of the first bevel gear 83. A rotating shaft 85 is fixedly sleeved inside the second bevel gear 84 and rotatably sleeved inside the connecting seat 82. A protective cover 86 is provided on the outer sides of both the first bevel gear 83 and the second bevel gear 84. The protective cover 86 is fixedly connected to the top of the inner wall of the connecting seat 82. A sealing sleeve 87 is rotatably sleeved on the outer side of the rotating shaft 85 and fixedly connected to the protective cover 86. By designing the sealing sleeve 87, the rotating shaft 85 and the protective cover 86 can be connected together. The connection of 6 is sealed. A rotating ring 88 is fixedly sleeved on the outer side of the rotating shaft 85. A connecting rod 89 is hinged inside the rotating ring 88. The connecting rod 89 is slidably connected to the connecting seat 82. A fixing rod 891 is fixedly connected to the inner side of the connecting rod 89. A sliding sleeve 892 is rotatably sleeved on the outer side of the fixing rod 891. A connecting rod 893 is fixedly connected to the bottom of the sliding sleeve 892. A support frame 894 is fixedly connected to the bottom of the connecting rod 893. A material trough 895 is fixedly connected to the lower end of the support frame 894. A plurality of annular and evenly distributed through holes 896 are opened inside the material trough 895. A support net 897 is provided at the bottom of the material trough 895. By designing the pickling mechanism 8, rapid contact pickling of materials and pickling solution can be achieved.

[0030] The cleaning mechanism 9 includes a crossbar 91. The left and right ends of the rotating seat 13 are fixedly connected to the crossbar 91. A connecting sleeve 92 is slidably sleeved on the outer side of the crossbar 91. A scraper 93 is fixedly connected to the outer side of the connecting sleeve 92, and the scraper 93 contacts the inner wall of the pickling tank 4. A guide rod 94 is fixedly connected to the inner wall of the connecting sleeve 92, and the guide rod 94 is slidably connected to the crossbar 91. A spring 95 is provided on the outer side of the guide rod 94. One end of the spring 95 is fixedly connected to the inner wall of the connecting sleeve 92, and the other end of the spring 95 is fixedly connected to the crossbar 91. The spring 95 is designed so that its elastic force can act on the connecting sleeve 92. Ball bearings 96 are movably sleeved on the top and bottom of the crossbar 91, and the ball bearings 96 are slidably connected to the connecting sleeve 92. Sliding grooves 97 are provided on the top and bottom of the inner wall of the connecting sleeve 92, and two sliding grooves 97 are slidably connected inside each groove. The ball bearing 96, with a sliding groove 97, allows it to slide along the groove. The top of the base plate 1 contacts a collection groove 98, and a support frame 99 is slidably fitted inside the collection groove 98. A filter element 991 is installed inside the support frame 99, and a magnetic ring 992 contacts the bottom of the support frame 99. The magnetic ring 992 is fixedly connected to the inner wall of the collection groove 98. Multiple evenly distributed magnetic blocks 993 are fixedly connected to the bottom of the support frame 99, and the magnetic blocks 993 are slidably connected to the magnetic ring 992. The magnetic blocks 993 and the magnetic ring 992 are attracted to each other. By designing the attraction between the magnetic blocks 993 and the magnetic ring 992, the support frame 99 and the magnetic ring 992 can be connected and fixed. An opening 994 is provided inside the magnetic ring 992. Two symmetrically distributed handles 995 are fixedly connected to the top of the support frame 99. A cleaning mechanism 9 is designed to facilitate cleaning of the inside of the device.

[0031] The usage state of this invention is as follows: When in use, first put the material to be pickled into the inside of the material tank 895, then inject pickling liquid into the pickling tank 4, and then start the cylinder 7. The output end of the cylinder 7 drives the cover plate 10 to move down, so that the material tank 895 can be lowered into the pickling liquid inside the pickling tank 4. The material can be pickled by contacting the pickling liquid with the material.

[0032] During pickling, motor 11 operates simultaneously. The output of motor 11 drives rotating seat 13 to rotate, rotating seat 13 drives rotating block 81 to rotate, rotating block 81 drives bevel gear 1 83 to rotate, bevel gear 1 83 drives bevel gear 2 84 to rotate, bevel gear 2 84 drives rotating shaft 85 to rotate. The rotation of rotating shaft 85 causes connecting rod 89 to deflect vertically. Connecting rod 89 drives fixed rod 891 to move. When fixed rod 891 moves, sliding sleeve 892 slides along fixed rod 891. Sliding sleeve 892 drives connecting rod 893 and support frame 894 to move. Support frame 894 drives material tank 895 to shake vertically, which can realize the up and down movement of material tank 895 inside pickling tank 4. It can shake the material inside pickling tank 4, making the contact between the material and pickling solution faster and more uniform, and improving the pickling efficiency of the material.

[0033] When the motor 11 drives the rotating seat 13 to rotate, the rotating seat 13 will also drive the crossbar 91 to rotate. The crossbar 91 will drive the connecting sleeve 92 and the scraper 93 to rotate. The scraper 93 will rotate along the inner wall of the pickling tank 4. The scraper 93 can scrape off the solid residues on the inner wall of the pickling tank 4, which facilitates the cleaning of the inside of the pickling tank 4. In addition, the spring 95 inside the connecting sleeve 92 is in a compressed state. The spring 95 will give the connecting sleeve 92 an outward push force, which will make the scraper 93 stick tightly to the inner wall of the pickling tank 4, which can improve the cleaning effect of the inside of the pickling tank 4.

[0034] After pickling is completed, the waste liquid is discharged into the collection tank 98 through the drain port 14. After entering the collection tank 98, the waste liquid falls onto the surface of the filter element 991. Under the action of the filter element 991, the waste liquid can be filtered and purified. After filtration, the waste liquid will flow along the magnetic ring 992, which facilitates the recycling of pickling liquid. At the same time, the magnetic ring 992 can adsorb and collect metal objects for easy recycling. When the handle 995 is pulled upward, the handle 995 can move the support frame 99 upward. The support frame 99 will move the magnetic block 993 upward, causing the magnetic block 993 to separate from the magnetic ring 992. The support frame 99 can then be removed from the collection tank 98, which facilitates the replacement and maintenance of the filter element 991.

[0035] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the present invention. Various changes and modifications can be made to the present invention without departing from its spirit and scope. All such changes and modifications fall within the scope of the present invention as claimed, which is defined by the appended claims and their equivalents.

Claims

1. A pickling apparatus for producing molybdenum-copper heat sink materials, comprising a base plate (1), characterized in that: The bottom of the base plate (1) is fixedly connected to a plurality of annular and evenly distributed anti-slip pads (2), which are made of rubber. The top of the base plate (1) is fixedly connected to a plurality of support rods (3), the top of the support rods (3) is fixedly connected to a pickling tank (4), the top of the pickling tank (4) is fixedly connected to a support seat (5), the top of the support seat (5) is fixedly connected to a bracket (6), and the top of the bracket (6) is fixedly installed with two symmetrically distributed cylinders (7). The output end of the cylinders (7) is slidably connected to the bracket (6). (7) A cover plate (10) is fixedly connected to the lower end of the output end. The cover plate (10) is slidably connected to the pickling tank (4). A motor (11) is fixedly installed on the top of the cover plate (10). The output end of the motor (11) is rotatably connected to the cover plate (10). A rotating seat (13) is fixedly connected to the lower end of the output end of the motor (11). A drain port (14) is provided at the bottom of the pickling tank (4). A valve is provided on the drain port (14). A pickling mechanism (8) is provided inside the pickling tank (4). A cleaning mechanism (9) is provided on the pickling tank (4).

2. The pickling apparatus for producing molybdenum-copper heat sink materials according to claim 1, characterized in that: A sealing ring (12) is rotatably sleeved on the outer side of the output end of the motor (11). The sealing ring (12) is fixedly connected to the cover plate (10). The sealing ring (12) is made of rubber.

3. The pickling apparatus for producing molybdenum-copper heat sink materials according to claim 1, characterized in that: The pickling mechanism (8) includes a rotating block (81). The rotating block (81) is fixedly connected to the bottom of the rotating seat (13). A connecting seat (82) is rotatably sleeved on the outside of the rotating block (81). A bevel gear one (83) is fixedly connected to the bottom of the rotating block (81). A bevel gear two (84) meshes with the outside of the bevel gear one (83). A rotating shaft (85) is fixedly sleeved inside the bevel gear two (84). The rotating shaft (85) is rotatably sleeved inside the connecting seat (82). A protective cover (86) is provided on the outside of the bevel gear one (83) and the bevel gear two (84). The protective cover (86) is fixedly connected to the top of the inner wall of the connecting seat (82). The outside of the rotating shaft (85) is fixedly... A rotating ring (88) is fixedly connected to the rotating ring (88), and a connecting rod (89) is hinged inside the rotating ring (88). The connecting rod (89) is slidably connected to the connecting seat (82). A fixing rod (891) is fixedly connected to the inner side of the connecting rod (89), and a sliding sleeve (892) is rotatably connected to the outer side of the fixing rod (891). A connecting rod (893) is fixedly connected to the bottom of the sliding sleeve (892), and a support frame (894) is fixedly connected to the bottom of the connecting rod (893). A material trough (895) is fixedly connected to the lower end of the support frame (894). A plurality of annular and evenly distributed through holes (896) are opened inside the material trough (895), and a support net (897) is provided at the bottom of the material trough (895).

4. The pickling apparatus for producing molybdenum-copper heat sink materials according to claim 3, characterized in that: A sealing sleeve (87) is rotatably sleeved on the outer side of the rotating shaft (85), and the sealing sleeve (87) is fixedly connected to the protective cover (86).

5. The pickling apparatus for producing molybdenum-copper heat sink materials according to claim 1, characterized in that: The cleaning mechanism (9) includes a crossbar (91). The left and right ends of the rotating seat (13) are fixedly connected to the crossbar (91). A connecting sleeve (92) is slidably sleeved on the outer side of the crossbar (91). A scraper (93) is fixedly connected to the outer side of the connecting sleeve (92). The scraper (93) contacts the inner wall of the pickling tank (4). A guide rod (94) is fixedly connected to the inner wall of the connecting sleeve (92). The guide rod (94) is slidably connected to the crossbar (91). Ball bearings (96) are movably sleeved on the top and bottom of the crossbar (91). 96) Sliding connection with connecting sleeve (92), the top of the base plate (1) is in contact with a collection groove (98), a support frame (99) is slidably sleeved inside the collection groove (98), a filter element (991) is provided inside the support frame (99), a magnetic ring (992) is in contact with the bottom of the support frame (99), the magnetic ring (992) is fixedly connected to the inner side wall of the collection groove (98), an opening (994) is opened inside the magnetic ring (992), and two symmetrically distributed handles (995) are fixedly connected to the top of the support frame (99).

6. The pickling apparatus for producing molybdenum-copper heat sink materials according to claim 5, characterized in that: A spring (95) is provided on the outside of the guide rod (94). One end of the spring (95) is fixedly connected to the inner wall of the connecting sleeve (92), and the other end of the spring (95) is fixedly connected to the crossbar (91).

7. The pickling apparatus for producing molybdenum-copper heat sink materials according to claim 5, characterized in that: The inner top and bottom of the inner wall of the connecting sleeve (92) are provided with grooves (97), and ball bearings (96) are slidably connected inside the two grooves (97).

8. The pickling apparatus for producing molybdenum-copper heat sink materials according to claim 5, characterized in that: The bottom of the support frame (99) is fixedly connected with a plurality of evenly distributed magnetic blocks (993), the magnetic blocks (993) are slidably connected to the magnetic ring (992), and the magnetic blocks (993) are attracted to the magnetic ring (992).

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