Magnetic tile inner arc polishing device

Abstract

The utility model aims at providing a kind of magnetic shoe inner arc polishing device, including frame body and polishing subassembly, lifting plate is slidably arranged on frame body, polishing subassembly includes base, clamping ring, conical grinding disc and driving part, base is set on frame body, the both ends of clamping ring axial direction are reversibly covered on base, clamping ring is used to clamp several magnetic shoes, to make each magnetic shoe jointly enclose pipe shape structure, driving part is set on lifting plate, conical grinding disc is set on the output shaft of driving part, lifting plate drives driving part to slide down, to make conical grinding disc polish the inner arc edge of pipe shape structure.

Description

Technical Field

[0001] This utility model relates to the technical field of magnetic tile processing, and in particular to a magnetic tile inner arc grinding device. Background Technology

[0002] As a core component of permanent magnet motors, magnetic tiles are widely used in drive motors for new energy vehicles, industrial servo motors, and motors for household appliances. Their shape is typically arc-shaped, and the inner arc surface must precisely fit the motor rotor core. Therefore, the machining accuracy of the inner arc surface directly determines the assembly quality, operational stability, and energy efficiency of the motor. In the manufacturing process of magnetic tiles, grinding the inner arc edge is a crucial post-processing step. It requires grinding equipment to remove burrs and flash from the inner arc edge of the magnetic tile, ensuring that the roughness, roundness, and dimensional tolerances of the inner arc edge meet design standards to satisfy the high-precision requirements of subsequent motor assembly.

[0003] However, existing magnetic tile inner arc grinding devices have the following shortcomings in practical use: With the rapid development of industries such as new energy vehicles and industrial automation, the market demand for magnetic tiles has exploded. Existing magnetic tile inner arc edge grinding devices can only grind one tile at a time, resulting in low processing efficiency and failing to meet the current market demand. Therefore, this application proposes a magnetic tile inner arc grinding device. Utility Model Content

[0004] The purpose of this invention is to overcome the shortcomings of the prior art and provide a magnetic tile inner arc grinding device that can simultaneously grind the inner arcs of multiple magnetic tiles to improve processing efficiency.

[0005] The objective of this utility model is achieved through the following technical solution: A magnetic tile inner arc grinding device, comprising: A frame, on which a lifting plate is slidably mounted; and A grinding assembly includes a base, a clamping ring, a conical grinding disc, and a driving component. The base is mounted on the frame. The two ends of the clamping ring are rotatably fitted onto the base. The clamping ring is used to clamp several magnetic tiles so that the magnetic tiles together form a circular tube structure. The driving component is mounted on the lifting plate. The conical grinding disc is mounted on the output shaft of the driving component. The lifting plate drives the driving component to slide downward so that the conical grinding disc grinds the inner arc edge of the circular tube structure.

[0006] Optionally, the clamping ring is provided with a snap-fit ​​portion, and the base is provided with a support portion, wherein the snap-fit ​​portion and the support portion are coaxially abutted together.

[0007] Optionally, the clamping ring has a through hole, the snap-fit ​​part is disposed on the inner sidewall of the through hole, and the snap-fit ​​part is located at the middle position of the through hole in the axial direction.

[0008] Optionally, the clamping ring is further provided with a plurality of arc-shaped holes, each of which is distributed at equal angles along the circumference with the axis of the clamping ring as the center, and the arc-shaped holes are used to engage with the magnetic tile.

[0009] Optionally, the clamping ring is provided with a plurality of top grooves, and each of the top grooves is connected to each of the arc-shaped holes in a corresponding manner. The grinding assembly also includes a plurality of clamping members, each of the clamping members being disposed in each of the top grooves, and one end of each clamping member extending into the arc-shaped hole to clamp the magnetic tile.

[0010] Optionally, the clamping member includes a top block, a cover plate, and an elastic member. The top block is slidably disposed in the top groove, the cover plate is disposed on the clamping ring, and the two ends of the elastic member abut against the top block and the cover plate respectively. The elastic member is used to push the top block against the magnetic tile.

[0011] Optionally, the clamping ring is provided with a crossbar, and the base is provided with a limiting post, the crossbar being engaged with the limiting post.

[0012] Optionally, the frame has a circular hole, and the base has a through hole, with both ends of the through hole coaxially connected to the circular hole and the through hole, respectively.

[0013] Optionally, the grinding device further includes a guide tube, which is disposed on the frame and one end of the guide tube is connected to the circular hole.

[0014] Optionally, the grinding device further includes a waste bin, which is disposed on the frame and located below the guide pipe.

[0015] Compared with the prior art, the present invention has at least the following advantages: This utility model's inner arc grinding device for magnetic tiles utilizes several arc-shaped holes in the clamping ring to clamp the magnetic tiles into a cylindrical structure. Combined with the rotation of the conical grinding disc and the downward movement driven by the lifting plate, all the inner arcs of the magnetic tiles can be ground simultaneously, avoiding downtime during single-tile grinding. Furthermore, the clamping ring can be flipped and fitted onto the base support; after grinding one end of the magnetic tile, flipping the clamping ring allows for switching to grind the other end without re-clamping, further saving time. The top block of the clamping component, in conjunction with the elastic element, stably clamps the magnetic tiles, ensuring grinding accuracy and preventing the magnetic tiles from slipping out of the arc-shaped groove during the clamping ring's flipping process. The U-shaped groove engagement between the crossbar and the limiting post secures the clamping ring, preventing rotation and improving consistency. Simultaneously, the round holes, through holes, and guide pipe form a waste channel, while the water spray pipe reduces dust and heat, balancing environmental protection and product quality. Attached Figure Description

[0016] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this utility model and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of the structure of a magnetic tile inner arc grinding device according to one embodiment of the present invention; Figure 2 This is a schematic diagram of the structure of the conical grinding disc and the magnetic tile abutting in one embodiment of the present invention; Figure 3 This is a cross-sectional structural schematic diagram of a magnetic tile inner arc grinding device according to one embodiment of the present invention; Figure 4 for Figure 3 A magnified schematic diagram of the structure of part A in the diagram; Figure 5 This is a schematic diagram of the structure of the clamping ring clamping each magnetic tile according to one embodiment of the present invention; Figure 6 This is a schematic diagram of the structure of the clamping ring sleeved on the base according to one embodiment of the present invention; Figure 7 This is a schematic diagram of the clamping ring according to one embodiment of the present invention; Figure 8 This is a cross-sectional structural diagram of the top groove opening position according to one embodiment of the present invention; Figure 9 This is a schematic diagram of the cross-sectional structure of the clamping ring according to one embodiment of the present invention.

[0018] Explanation of reference numerals in the attached figures: 1. Inner arc grinding device for magnetic tiles; 10. Frame; 100. Round hole; 11. Lifting plate; 20. Base; 200. Limiting post; 2000. U-shaped groove; 201. Support part; 2010. Through hole; 21. Clamping ring; 210. Through hole; 211. Snap-fit ​​part; 212. Arc hole; 213. Top groove; 214. Crossbar; 2140. Anti-slip groove; 22. Conical grinding disc; 23. Driving component; 240. Top block; 2401. Sliding part; 2402. Cylindrical part; 241. Cover plate; 242. Elastic component; 25. Guide pipe; 26. Waste bin; 27. Water spray pipe; 28. Magnetic tile. Detailed Implementation

[0019] To facilitate understanding of this utility model, a more comprehensive description will be provided below with reference to the accompanying drawings. The drawings illustrate preferred embodiments of this utility model.

[0020] In the description of the embodiments of this utility model, it should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. They are only for the convenience of describing the embodiments of this utility model 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 utility model.

[0021] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of embodiments of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0022] In this embodiment of the invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this embodiment of the invention according to the specific circumstances.

[0023] like Figures 1 to 9 As shown, in one embodiment, a magnetic tile inner arc grinding device 1 includes a frame 10 and a grinding assembly. A lifting plate 11 is slidably arranged on the frame 10. The grinding assembly includes a base 20, a clamping ring 21, a conical grinding disc 22, and a driving component 23. The base 20 is disposed on the frame 10. The two ends of the clamping ring 21 in the axial direction are flipped and sleeved on the base 20. The clamping ring 21 is used to clamp several magnetic tiles 28 so that the magnetic tiles 28 together form a circular tube structure. The driving component 23 is disposed on the lifting plate 11. The conical grinding disc 22 is disposed on the output shaft of the driving component 23. The lifting plate 11 drives the driving component 23 to slide downward so that the conical grinding disc 22 grinds the inner arc edge of the circular tube structure.

[0024] It should be noted that cylinders are installed on both sides of the platform of the frame 10, and vertical shafts are set at the four corners of the platform of the frame 10. The four corners of the lifting plate 11 pass through the shafts, and the two ends of the lifting plate 11 are connected to the output shafts of the two cylinders, so that the two cylinders drive the lifting plate 11 to slide up and down in parallel relative to the platform of the frame 10. Furthermore, the drive component 23 is a motor structure, which is mounted on the lifting plate 11, and the output shaft of the drive component 23 passes through the lifting plate 11 and extends from the side of the lifting plate 11 closest to the table surface of the frame 10; the conical grinding disc 22 is coaxially mounted on the output shaft of the drive component 23; thus, when the drive component 23 drives the conical grinding disc 22 to rotate, the two cylinders simultaneously drive the lifting plate 11 to slide downward, so that the conical grinding disc 22 moves downward closer to the table surface of the frame 10; furthermore, the conical grinding disc 22 has a conical structure, with the end with the largest diameter connected to the output shaft of the drive component 23, and the end with the smallest diameter close to the table surface of the frame 10. Furthermore, the base 20 is disposed on the platform of the frame 10 and located below the lifting plate 11; the clamping ring 21 tends to be a circular structure, and the clamping ring 21 is coaxially sleeved on the base 20, so that the base 20 supports the clamping ring 21 in a state of near suspension (that is, one side of the clamping ring 21 protrudes relative to the base 20, and the other side is spaced from the upper surface of the base 20). The clamping ring 21 is used to clamp several magnetic tiles 28 so that each magnetic tile 28 forms a circular tube structure with the axis of the clamping ring 21 as the center, and one end of the circular tube structure abuts against the upper surface of the base 20, and the other end of the circular tube structure protrudes relative to the end of the clamping ring 21 away from the base 20 (that is, the clamping ring 21 clamps the middle position of the magnetic tile 28, so that the two ends of the magnetic tile 28 extend from the two ends of the clamping ring 21 axially), and the circular tube structure is coaxially aligned with the conical grinding disc 22. When the drive unit 23 rotates the conical grinding disc 22, the two cylinders simultaneously drive the lifting plate 11 to slide downwards in parallel, so that the rotating conical grinding disc 22 approaches the cylindrical structure, making the side of the conical grinding disc 22 coaxially abut against the inner arc edge of the cylindrical structure. This allows the conical grinding disc 22 to simultaneously grind the inner arc edges of each magnetic tile 28. In this way, multiple inner arc edges of magnetic tiles 28 can be ground simultaneously in the grinding process, thereby improving processing efficiency.

[0025] like Figures 3 to 7 , Figure 9 As shown, in one embodiment, the clamping ring 21 is provided with a snap-fit ​​portion 211, and the base 20 is provided with a support portion 201. The snap-fit ​​portion 211 and the support portion 201 are coaxially abutted together.

[0026] It should be noted that the clamping ring 21 has a through hole 210 that passes through both ends of the clamping ring 21 axially; the snap-fit ​​part 211 is arranged in a ring structure on the inner side wall of the through hole 210, and the snap-fit ​​part 211 is located in the middle position of the through hole 210; furthermore, the base 20 is provided with a support part 201, which is circular in structure, and the outer diameter of the support part 201 is adapted to the diameter of the through hole 210. When the clamping ring 21 drives the through hole 210 to be sleeved on the support part 201, the snap-fit ​​part 211 is coaxially abutted against the end face of the support part 201. Since the snap-fit ​​part 211 is located in the middle position of the through hole 210, when the snap-fit ​​part 211 abuts against the end face of the support part 201, the end of the clamping ring 21 away from the base 20 protrudes relative to the base 20, and there is a gap between the end of the clamping ring 21 near the base 20 and the upper surface of the base 20. Thus, when the clamping ring 21 clamps each magnetic tile 28, both ends of each magnetic tile 28 can extend out from both ends of the clamping ring 21 in the axial direction, and the end of each magnetic tile 28 away from the conical grinding disc 22 abuts against the upper surface of the base 20, so that the clamping ring 21 and the base 20 together clamp each magnetic tile 28.

[0027] It should be noted that since the snap-fit ​​part 211 is located in the middle of the through hole 210, when the through hole 210 is centered on the snap-fit ​​part 211, both ends of the through hole 210 in the axial direction can be sleeved with the support part 201. For ease of description, with the snap-fit ​​part 211 as the center, the end of the through hole 210 closer to the base 20 is defined as the lower end, and the end of the through hole 210 farther from the base 20 is defined as the upper end. When the clamping ring 21 clamps several magnetic tiles 28, and the two ends of each magnetic tile 28 extend from the two ends of the clamping ring 21 in the axial direction, the end of the magnetic tile 28 farther from the base 20 is defined as the first end face, and the end face of the magnetic tile 28 closer to the base 20 is defined as the second end face. Thus, when the lower end of the through hole 210 is fitted onto the support part 201, the conical grinding disc 22 grinds the first end face of the magnetic tile 28. After the first end face is ground, the operator can manually lift the clamping ring 21 from the base 20 and flip it so that the upper end of the through hole 210 is fitted onto the support part 201, so that the conical grinding disc 22 grinds the second end face of the magnetic tile 28. In this way, the two ends of the clamping ring 21 can be flipped and fitted onto the base 20, so that after the inner arc edge of one end of the multiple magnetic tiles 28 is processed, it can be quickly switched to the inner arc edge of the other end to improve processing efficiency.

[0028] like Figures 5 to 8 As shown, in one embodiment, the clamping ring 21 is also provided with a plurality of arc-shaped holes 212, each arc-shaped hole 212 being distributed at equal angles along the circumference with the axis of the clamping ring 21 as the center, and the arc-shaped holes 212 being used to engage with the magnetic tile 28.

[0029] It should be noted that each arc-shaped hole 212 is centered on the axis of the clamping ring 21 and is distributed at equal angles along the circumference, and each arc-shaped hole 212 passes through both ends of the clamping ring 21 in the axial direction. Furthermore, the cross-sectional shape of the arc-shaped hole 212 matches the cross-sectional shape of the magnetic tile 28, allowing the magnetic tile 28 to fit snugly into the arc-shaped hole 212. Furthermore, the outer arc edges at both ends of the arc-shaped hole 212 have a chamfered structure, allowing the magnetic tile 28 to be quickly inserted into the arc-shaped hole 212.

[0030] like Figure 8 As shown, in one embodiment, the clamping ring 21 is provided with a plurality of top grooves 213, and each top groove 213 is connected to each arc-shaped hole 212 in a corresponding manner. Each clamping member is respectively disposed in each top groove 213. The grinding assembly also includes a plurality of clamping members, one end of which extends into the arc-shaped hole 212 to clamp the magnetic tile 28.

[0031] It should be noted that several top grooves 213 are provided on the outer wall of the clamping ring 21. Each top groove 213 is distributed at equal angles along the circumference of the clamping ring 21, and each top groove 213 is perpendicularly connected to each arc-shaped hole 212. Each clamping member is respectively provided in each top groove 213, and one end of the clamping member extends into the arc-shaped hole 212. This allows the clamping member to clamp the magnetic tile 28 radially along the clamping ring 21.

[0032] like Figures 1 to 2 , Figures 5 to 8 As shown, in one embodiment, the clamping member includes a top block 240, a cover plate 241, and an elastic member 242. The top block 240 is slidably disposed in the top groove 213, the cover plate 241 is disposed on the clamping ring 21, and the two ends of the elastic member 242 abut against the top block 240 and the cover plate 241 respectively. The elastic member 242 is used to push the top block 240 to abut against the magnetic tile 28.

[0033] It should be noted that the top block 240 is slidably disposed in the top groove 213, and the cover plate 241 is disposed on the outer side wall of the clamping ring 21 to seal the top groove 213. The elastic member 242 is a spring structure. The elastic member 242 is located in the top groove 213, and its two ends abut against the cover plate 241 and the top block 240 respectively, so that the end of the top block 240 away from the cover plate 241 pushed by the elastic member 242 extends into the arc-shaped hole 212. Furthermore, the top block 240 includes a sliding part 2401 and a cylindrical part 2402. The elastic member 242 abuts against the sliding part 2401. The end face of the cylindrical part 2402 away from the elastic member 242 is a hemispherical structure, and this part of the hemispherical structure extends into the arc-shaped hole 212. In this way, when the magnetic tile 28 is inserted from both ends of the arc-shaped hole 212, the outer arc edge of the magnetic tile 28 can squeeze the elastic member 242 along the hemispherical structure, thereby causing the elastic member 242 to push the top block 240 to press against the outer wall of the magnetic tile 28, preventing each magnetic tile 28 from sliding out of each arc-shaped hole 212 during the flipping process of the clamping ring 21.

[0034] like Figures 1 to 9 As shown, in one embodiment, the clamping ring 21 is provided with a crossbar 214, and the base 20 is provided with a limiting post 200, and the crossbar 214 is engaged with the limiting post 200.

[0035] It should be noted that, in one embodiment, two crossbars 214 are provided on the outer wall of the clamping ring 21, and the two crossbars 214 are arranged opposite each other along the radial direction of the clamping ring 21; two limiting posts 200 are provided on the base 20, and the two limiting posts 200 are arranged on opposite sides of the support part 201; each of the two limiting posts 200 has a U-shaped groove 2000, and the groove width of the U-shaped groove 2000 is adapted to the diameter of the crossbar 214. When the through hole 210 on the clamping ring 21 is coaxially fitted onto the support part 201 of the base 20, the clamping ring 21 can rotate relative to the base 20. Then, by engaging the two crossbars 214 with the two U-shaped grooves 2000 respectively, the clamping ring 21 is restricted from rotating, thereby fixing the circular tube structure formed by the magnetic tiles 28. Furthermore, the crossbar 214 has a cylindrical structure, so that after the clamping ring 21 is flipped, both crossbars 214 can still be engaged with the two U-shaped grooves 2000 respectively, thus keeping the clamping ring 21 in a state where it cannot rotate at all times. It should be noted that the length of the two crossbars 214 is greater than the distance between the limiting post 200 and the support part 201, so that after the crossbars 214 are engaged with the U-shaped groove 2000, the end of the crossbars 214 that is away from the clamping ring 21 will extend from the end of the limiting post 200 that is away from the clamping ring 21. The part of the crossbars 214 that extends from the limiting post 200 is provided with anti-slip grooves 2140, so that the operator can hold the extended part of the two crossbars 214 with both hands to flip the clamping ring 21.

[0036] like Figures 3 to 4 As shown, in one embodiment, the frame 10 has a circular hole 100 and the base 20 has a through hole 2010. The two ends of the through hole 2010 are coaxially connected to the circular hole 100 and the through hole 210, respectively.

[0037] It should be noted that the frame 10 has a circular hole 100 that penetrates both ends of the platform of the frame 10; the base 20 has a through hole 2010 that is coaxially formed on the support part 201 and penetrates both ends of the support part 201 axially; the base 20 is set on the frame 10, and the through hole 2010 and the circular hole 100 are coaxially connected, and the diameters of the circular hole 100 and the through hole 2010 are the same. When the clamping ring 21 drives the through hole 210 to engage with the support part 201, the through hole 210 can connect with the circular hole 100 and the through hole 2010 to form a waste channel. In this way, when the conical grinding disc 22 grinds the inner arc edge of the magnetic tile 28, the waste material ground off the magnetic tile 28 can be discharged through the waste channel.

[0038] like Figures 1 to 3 As shown, in one embodiment, the grinding device further includes a guide tube 25, which is disposed on the frame 10, and one end of the guide tube 25 is connected to the circular hole 100.

[0039] It should be noted that the guide pipe 25 is located on the end of the frame 10 away from the base 20, and the diameter of the guide pipe 25 is the same as the diameter of the circular hole 100, and it is connected to the circular hole 100. In this way, waste material can fall into the guide pipe 25 through the waste material channel.

[0040] like Figures 1 to 3 As shown, in one embodiment, the grinding device further includes a waste bin 26, which is disposed on the frame 10 and located below the guide pipe 25.

[0041] It should be noted that the waste bin 26 is used to collect the waste material discharged from the feed pipe 25 after grinding.

[0042] like Figures 1 to 4 As shown, in one embodiment, the polishing device further includes a water spray pipe 27.

[0043] It should be noted that the water spray pipe 27 is installed on the frame 10, and one end of the water spray pipe 27 is connected to the water source. The other end of the water spray pipe 27 extends upward from the guide pipe 25 into the through hole 2010, and the nozzle of the water spray pipe 27 is parallel to the snap-fit ​​part 211. In this way, when the water is sprayed upward in a conical shape at a 45-degree angle from the nozzle, the water can be sprayed to the grinding position, thereby reducing the amount of dust floating into the air during the grinding process and polluting the air. At the same time, it can also reduce the temperature of the grinding area of ​​the magnetic tile 28, and prevent the magnetic tile 28 from developing micro-cracks or cracks due to uneven thermal stress, which would lead to product scrap.

[0044] The embodiments described above are merely illustrative of several implementations of this utility model, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model patent should be determined by the appended claims.

Claims

1. A magnetic tile inner arc grinding device, characterized in that, include: A frame, on which a lifting plate is slidably mounted; and A grinding assembly includes a base, a clamping ring, a conical grinding disc, and a driving component. The base is mounted on the frame. The two ends of the clamping ring are rotatably fitted onto the base. The clamping ring is used to clamp several magnetic tiles so that the magnetic tiles together form a circular tube structure. The driving component is mounted on the lifting plate. The conical grinding disc is mounted on the output shaft of the driving component. The lifting plate drives the driving component to slide downward so that the conical grinding disc grinds the inner arc edge of the circular tube structure.

2. The magnetic tile inner arc grinding device according to claim 1, characterized in that, The clamping ring is provided with a snap-fit ​​part, and the base is provided with a support part, wherein the snap-fit ​​part and the support part are coaxially abutted together.

3. The magnetic tile inner arc grinding device according to claim 2, characterized in that, The clamping ring has a through hole, and the snap-fit ​​part is disposed on the inner side wall of the through hole, and the snap-fit ​​part is located at the middle position of the through hole in the axial direction.

4. The magnetic tile inner arc grinding device according to claim 3, characterized in that, The clamping ring is also provided with a number of arc-shaped holes, each of which is distributed at equal angles along the circumference with the axis of the clamping ring as the center, and the arc-shaped holes are used to engage with the magnetic tile.

5. The magnetic tile inner arc grinding device according to claim 4, characterized in that, The clamping ring has several top grooves, and each top groove is connected to each of the arc-shaped holes. The grinding assembly also includes several clamping members, each clamping member is disposed in each top groove, and one end of the clamping member extends into the arc-shaped hole to clamp the magnetic tile.

6. The magnetic tile inner arc grinding device according to claim 5, characterized in that, The clamping member includes a top block, a cover plate, and an elastic member. The top block is slidably disposed in the top groove, the cover plate is disposed on the clamping ring, and the two ends of the elastic member abut against the top block and the cover plate respectively. The elastic member is used to push the top block to abut against the magnetic tile.

7. The magnetic tile inner arc grinding device according to claim 6, characterized in that, The clamping ring is provided with a crossbar, and the base is provided with a limiting post, and the crossbar is engaged with the limiting post.

8. The magnetic tile inner arc grinding device according to claim 7, characterized in that, The frame has a circular hole, and the base has a through hole. The two ends of the through hole are coaxially connected to the circular hole and the through hole, respectively.

9. The magnetic tile inner arc grinding device according to claim 8, characterized in that, The grinding device also includes a guide tube, which is disposed on the frame and one end of the guide tube is connected to the circular hole.

10. The magnetic tile inner arc grinding device according to claim 9, characterized in that, The grinding device also includes a waste bin, which is mounted on the frame and located below the guide pipe.

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