Automatic centering device in optical element machining

Abstract

The utility model belongs to the technical field of optical element machining devices, and discloses an automatic centering device in optical element machining, which comprises a machining base, a rotating table rotationally mounted at the top of the machining base and an electric permanent magnetic chuck arranged at the top of the rotating table, and a rotating mechanism for driving the rotating table to rotate is arranged on the machining base. And a plurality of transverse plates slidably connected with the side wall of the machining base are arranged on the machining base in a penetrating mode, the transverse plates are evenly distributed about the axis of the rotating table, a vertical rod is fixed to the top of each transverse plate, and an adjusting mechanism used for driving the transverse plates to be close to or away from one another at the same time is arranged on the machining base. According to the optical glass polishing device, by arranging the adjusting mechanism, the multiple transverse plates drive the vertical rods fixed to the transverse plates to be close to one another at the same time, so that the optical glass placed on the rotating table can be centered, and the polishing effect of the optical glass is ensured.

Description

Technical Field

[0001] This utility model relates to the field of optical element processing equipment technology, and in particular to an automatic centering device in optical element processing. Background Technology

[0002] Optical components are devices that can manipulate the characteristics of light, such as the direction of light wave propagation, light intensity, frequency, and phase. Optical glass is one of the commonly used materials for manufacturing optical components. Optical glass is often used to manufacture key components such as lenses, prisms, mirrors, and windows in optical instruments. In the process of manufacturing optical components, it is usually necessary to cut the raw material of optical glass to achieve the required shape. After cutting the optical glass, the cut edges of the optical components will be relatively sharp and have poor smoothness, so it is necessary to polish the edges with a grinding machine.

[0003] A semi-automatic side-processing machine for optical glass is disclosed in Chinese utility model patent with publication number CN222222094U. The machine includes a processing table base, a rotary table is mounted on the top of the processing table base, and a power output shaft of a servo motor is connected to the lower center of the rotary table. An air pump is installed inside the rotary table, and an exhaust pipe is connected to one side of the air pump. A connecting pipe is connected above the air pump, and a hollow adsorption plate is installed above the connecting pipe. The top surface of the adsorption plate has several equidistant and evenly distributed air holes.

[0004] Regarding the aforementioned technologies, the inventors believe that the following defects exist: the aforementioned technologies use a rotary table to rotate the optical glass and perform grinding operations. In order to ensure grinding accuracy and effect, the axis of the optical glass must coincide with the axis of the rotary table. However, the aforementioned processing machine is difficult to automatically complete the centering operation of the optical glass. If the center of the optical glass deviates from the rotary table, it will easily affect the grinding effect of the optical glass. Utility Model Content

[0005] To address the aforementioned problems, this invention provides an automatic alignment device for optical element processing.

[0006] The above-mentioned technical objective of this utility model is achieved through the following technical solution: an automatic centering device for optical element processing, comprising a processing base, a rotating table rotatably mounted on the top of the processing base, and an electro-permanent magnet chuck disposed on the top of the rotating table. The processing base is provided with a rotating mechanism for driving the rotating table to rotate. A horizontal plate is slidably connected to the side wall of the processing base through the processing base. Multiple horizontal plates are provided and evenly distributed about the axis of the rotating table. A vertical rod is fixed to the top of each horizontal plate. The processing base is provided with an adjustment mechanism for driving multiple horizontal plates to move closer or further apart from each other simultaneously.

[0007] By adopting the above technical solution, the operator first places the optical glass to be polished on the top of the rotary table. A control and adjustment mechanism drives multiple horizontal plates to move closer together simultaneously. Since the horizontal plates are evenly distributed about the axis of the rotary table, multiple vertical bars simultaneously approach each other and contact the edge of the optical glass. This brings the axis of the optical glass closer to the axis of the rotary table until they coincide, thus achieving the centering of the optical glass. Subsequently, an electro-permanent magnet chuck is used to adsorb and position the optical glass. Finally, a rotation mechanism drives the rotary table to rotate with the optical glass, allowing the polishing tools to polish the optical glass. After processing, the control and adjustment mechanism drives the horizontal plates to move away from each other simultaneously, causing the multiple vertical bars to move away from each other and releasing the optical glass, allowing the operator to remove the polished optical glass. This application ensures the polishing effect of the optical glass by performing a centering operation before polishing.

[0008] Furthermore, the processing base has an internal cavity, and the adjustment mechanism includes an adjustment component. The adjustment component includes a transmission sleeve rotatably mounted on the inner top wall of the cavity and vertically arranged, and an adjustment disc fixedly sleeved on the transmission sleeve and horizontally arranged. Each horizontal plate has an adjustment block at its bottom, and the top of the adjustment disc has an arc-shaped through hole that is slidably connected to the adjustment block. The axis of the arc-shaped through hole is eccentrically set with the axis of the adjustment disc. The number of arc-shaped through holes is equal to the number of adjustment blocks, and their positions correspond one-to-one. The adjustment mechanism also includes a drive component for driving the transmission sleeve to rotate.

[0009] By adopting the above technical solution, the operator can control the drive assembly to drive the transmission sleeve to rotate, causing the adjusting disc fixed to the transmission sleeve to rotate. Because the limiting block slides into the arc-shaped through hole, and the axis of the arc-shaped through hole is eccentrically set with respect to the axis of the adjusting disc, the limiting block slides along the inner wall of the arc-shaped through hole. This causes the horizontal plate fixed to the limiting block and the vertical rod fixed to the horizontal plate to move towards the axis of the adjusting disc, thus achieving the purpose of clamping and centering the optical glass. Similarly, by driving the drive assembly to rotate the transmission sleeve in the opposite direction, multiple vertical rods can move towards the side away from the axis of the adjusting disc, thereby releasing the optical glass for removal after processing.

[0010] Furthermore, the drive assembly includes a worm gear fixedly sleeved on the transmission sleeve, a worm rotatably installed in the cavity and meshing with the worm gear, and an operating rod fixed to one end of the worm. The operating rod passes through the side wall of the machining base and is rotatably connected. The drive assembly also includes a rotating wheel fixed to the end of the operating rod away from the machining base.

[0011] By adopting the above technical solution, the operator can rotate the operating rod and worm gear through the rotating wheel, so that the worm wheel meshing with the worm gear, the transmission sleeve fixed to the worm wheel, and the adjustment disc fixed to the transmission sleeve all rotate, thereby achieving the purpose of centering or loosening the vertical rod on the optical glass.

[0012] Furthermore, the rotating mechanism includes a driven rod that passes through the top of the machining base and is rotatably connected to it, a driven bevel gear fixedly sleeved on the driven rod, an active rod that is rotatably mounted on the inner wall of the cavity and perpendicular to the transmission rod, an active bevel gear fixedly sleeved on the active rod and meshing with the driven bevel gear, and a drive motor fixed on the machining base and driving the active rod to rotate. The upper end of the driven rod is fixed to the bottom of the rotary table. The transmission sleeve is a cylindrical structure. The driven rod passes through the interior of the transmission sleeve. The axis of the driven rod coincides with the axis of the transmission sleeve and the axis of the rotary table.

[0013] By adopting the above technical solution, after the drive motor works, it drives the active rod to rotate, so that the active bevel gear fixed to the active rod, the driven bevel gear meshing with the active bevel gear, the driven rod fixed to the driven bevel gear, and the rotary table fixed to the driven rod all rotate, thereby realizing the purpose of rotating the optical glass placed on the rotary table so that the polishing tool can polish the optical glass.

[0014] Furthermore, a protective sleeve is rotatably mounted on the top of the horizontal plate and fitted onto the outside of the vertical rod, with the axis of the protective sleeve coinciding with the axis of the vertical rod.

[0015] By adopting the above technical solution, the protective sleeve reduces the friction between the optical glass and the vertical rod during the rotation of the optical glass with the rotary table.

[0016] Furthermore, the vertical rod is a cylindrical structure, and an adjusting rod that slides within the vertical rod is provided. A rubber rod extending toward the axis of the rotary table is rotatably mounted on the side wall of the adjusting rod near the upper end of the adjusting rod. The rubber rod and the vertical rod are perpendicular to each other. A bolt threadedly connected to the vertical rod is provided through the vertical rod, and the end of the bolt abuts against the side wall of the adjusting rod.

[0017] By adopting the above technical solution, as the vertical rod approaches the axis of the rotary table and clamps the optical glass, the rubber rod gradually moves to a state of contact with the top of the optical glass, which increases the stability of the optical glass during rotation. By rotating the bolt and separating the end of the bolt from the side wall of the adjusting rod, the height of the adjusting rod can be adjusted, thereby achieving the purpose of adjusting the distance between the bottom of the rubber rod and the top of the rotary table, so that the distance is equal to the thickness of the optical glass to be processed, thus expanding the applicability of the automatic centering device.

[0018] Furthermore, the end of the rubber rod closest to the axis of the rotary table is hemispherical.

[0019] By adopting the above technical solution, the hemispherical shape of the rubber rod reduces the probability of the rubber rod obstructing the centering action of the optical glass.

[0020] Furthermore, the top of the rotary table is provided with a first mounting groove, the bottom of the first mounting groove is provided with a support base, the bottom of the support base is provided with a smooth layer, the top of the support base is fixed with an annular rubber pad, the top of the support base is provided with a second mounting groove, the electro-permanent magnet chuck is fixed on the inner bottom wall of the second mounting groove, and a storage battery electrically connected to the electro-permanent magnet chuck is fixed on the inner bottom wall of the second mounting groove.

[0021] By adopting the above technical solution, the electro-permanent magnet chuck can adsorb and position the optical glass after it starts working. During the process of centering the optical glass with the vertical rod, the side wall of the vertical rod contacts the edge of the optical glass. Since the bottom of the support base is polished to form a smooth layer with a low coefficient of friction, and the top of the support base is fixed with an annular rubber pad with a high coefficient of friction, and the electro-permanent magnet chuck is fixed on the support base, the optical glass drives the support base to slide along the inner bottom wall of the first mounting groove, which is conducive to the centering of the optical glass.

[0022] In summary, this utility model has the following beneficial effects: In this application, the operator first places the optical glass to be polished on the top of the rotary table, and then rotates the operating lever and worm gear through the rotating wheel, so that the worm wheel meshing with the worm gear, the transmission sleeve fixed to the worm wheel, and the adjusting plate fixed to the transmission sleeve all rotate. Since the limiting block slides with the arc-shaped through hole, and the axis of the arc-shaped through hole is eccentrically set with the axis of the adjusting plate, the limiting block slides along the inner wall of the arc-shaped through hole, thereby causing the horizontal plate fixed to the limiting block and the vertical rod fixed to the horizontal plate to move towards the axis of the adjusting plate. The movement allows for the centering of the optical glass. Subsequently, the optical glass is attracted and positioned by an electro-permanent magnet chuck. Finally, the drive motor operates and drives the active rod to rotate, causing the active bevel gear fixed to the active rod, the driven bevel gear meshing with the active bevel gear, the driven rod fixed to the driven bevel gear, and the rotary table fixed to the driven rod to all rotate. This achieves the rotation of the optical glass placed on the rotary table, so that the grinding tool can perform the grinding work on the optical glass. This application ensures the grinding effect of the optical glass by performing a centering operation before grinding. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the overall structure of an embodiment of the present utility model;

[0024] Figure 2 yes Figure 1A cross-sectional structural diagram from another perspective;

[0025] Figure 3 This is a schematic diagram illustrating the structure of the adjustment component in an embodiment of this utility model;

[0026] Figure 4 This is a plan view of an embodiment of the present utility model;

[0027] Figure 5 yes Figure 4 Enlarged diagram of point A in the middle.

[0028] In the diagram: 1. Machining base; 2. Rotary table; 3. Electro-permanent magnet chuck; 4. Rotation mechanism; 41. Driven rod; 42. Driven bevel gear; 43. Driving rod; 44. Driving bevel gear; 45. Drive motor; 5. Horizontal plate; 6. Vertical rod; 7. Adjustment mechanism; 71. Adjustment assembly; 711. Transmission sleeve; 712. Adjustment disc; 72. Drive assembly; 721. Worm gear; 722. Worm; 723. Operating lever; 724. Rotary wheel; 8. Adjustment block; 9. Arc-shaped through hole; 10. Protective sleeve; 11. Adjustment rod; 12. Rubber rod; 13. Bolt; 14. First mounting slot; 15. Support base; 16. Annular rubber pad; 17. Second mounting slot; 18. Battery. Detailed Implementation

[0029] The technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0030] like Figure 1-5As shown in the figure, this application discloses an automatic alignment device for optical component processing, including a processing base 1, a rotary table 2, an electro-permanent magnet chuck 3, an adjustment mechanism 7, and a rotation mechanism 4. The rotary table 2 is rotatably mounted on the top of the processing base 1. The processing base 1 has an internal cavity, and the top of the rotary table 2 has a first mounting groove 14 with a circular cross-section. The electro-permanent magnet chuck 3 is disposed on the top of the rotary table 2 (the model of the electro-permanent magnet chuck 3 is DYCC2-1050; the internal structure and working principle of the electro-permanent magnet chuck 3 are existing technologies and do not require further description). A horizontal plate 5 is slidably connected to the side wall of the processing base 1. Four horizontal plates 5 are evenly distributed about the axis of the rotary table 2. A vertical rod 6 is fixed to the top of each horizontal plate 5. The vertical rod 6 is a cylindrical structure and is located on the side of the horizontal plate 5 away from the axis of the rotary table 2. In this embodiment, an adjustment block 8 is rotatably mounted on the bottom of each horizontal plate 5. The adjustment block 8 is located on the side of the horizontal plate 5 closer to the axis of the rotary table 2.

[0031] The adjusting mechanism 7 includes an adjusting component 71 and a driving component 72. The adjusting component 71 includes a transmission sleeve 711 and an adjusting disc 712. The transmission sleeve 711 has a cylindrical structure, and its upper end is rotatably mounted on the inner top wall of the cavity. The adjusting disc 712 is fixedly sleeved on the transmission sleeve 711 and is horizontally positioned. The top of the adjusting disc 712 has an arc-shaped through hole 9 that is slidably connected to the adjusting block 8. The axis of the arc-shaped through hole 9 is eccentrically positioned with respect to the axis of the adjusting disc 712. The number of arc-shaped through holes 9 is equal to the number of adjusting blocks 8, and their positions correspond one-to-one.

[0032] The drive assembly 72 is used to drive the rotation of the transmission sleeve 711, and the drive assembly 72 includes a worm gear 721, a worm 722, an operating lever 723, and a rotating wheel 724. The worm gear 721 is fixedly sleeved on the transmission sleeve 711, and the worm 722 is rotatably mounted in the cavity and meshes with the worm gear 721. The operating lever 723 is fixed to one end of the worm 722, and the operating lever 723 passes through the side wall of the machining base 1 and is rotatably connected. The rotating wheel 724 is fixed to the end of the operating lever 723 away from the machining base 1.

[0033] The rotating mechanism 4 is used to drive multiple horizontal plates 5 to move closer or further apart simultaneously. The rotating mechanism 4 includes a driven rod 41, a driven bevel gear 42, a driving rod 43, a driving bevel gear 44, and a drive motor 45. The driven rod 41 passes through the top of the processing base 1 and is rotatably connected thereto. The upper end of the driven rod 41 is fixed to the bottom of the rotary table 2. The driven rod 41 passes through the interior of the transmission sleeve 711, and the axis of the driven rod 41 coincides with the axis of the transmission sleeve 711 and the axis of the rotary table 2. The driven bevel gear 42 is fixedly sleeved on the driven rod 41. The driving rod 43 is rotatably mounted on the inner wall of the cavity and is perpendicular to the driven rod 41. The driving bevel gear 44 is fixedly sleeved on the driving rod 43 and meshes with the driven bevel gear 42. The drive motor 45 is fixed to the processing base 1. The output end of the drive motor 45 passes through the side wall of the processing base 1 and is rotatably connected thereto. The output end of the drive motor 45 is fixed to one end of the driving rod 43. The operator first places the optical glass to be polished on the top of the rotary table 2. The operating lever 723 and worm gear 722 are then rotated via the rotating wheel 724. This causes the worm wheel 721 meshing with the worm gear 722, the transmission sleeve 711 fixed to the worm wheel 721, and the adjusting disc 712 fixed to the transmission sleeve 711 to all rotate. Because the limiting block slides into the arc-shaped through hole 9, and the axis of the arc-shaped through hole 9 is eccentrically set with the axis of the adjusting disc 712, the limiting block slides along the inner wall of the arc-shaped through hole 9. This causes the horizontal plate 5 fixed to the limiting block and the vertical rod 6 fixed to the horizontal plate 5 to move towards the axis of the adjusting disc 712, thus causing the axis of the optical glass to rotate. By bringing the axes of the turntable 2 close together until they coincide, the optical glass can be aligned. Then, the optical glass is attracted and positioned by the electro-permanent magnet chuck 3. Finally, the drive motor 45 works and drives the active rod 43 to rotate, so that the active bevel gear 44 fixed to the active rod 43, the driven bevel gear 42 meshing with the active bevel gear 44, the driven rod 41 fixed to the driven bevel gear 42, and the turntable 2 fixed to the driven rod 41 all rotate. This achieves the purpose of rotating the optical glass placed on the turntable 2 so that the grinding tool can grind the optical glass. This application ensures the grinding effect of the optical glass by performing an alignment operation before grinding.

[0034] A protective sleeve 10 is rotatably mounted on the top of the horizontal plate 5, sleeved on the outside of the vertical rod 6, with the axis of the protective sleeve 10 coinciding with the axis of the vertical rod 6. As the optical glass rotates with the rotary table 2, the protective sleeve 10 reduces the friction between the optical glass and the vertical rod 6.

[0035] An adjusting rod 11 is installed inside the vertical rod 6, which slides within the vertical rod 6. A rubber rod 12 is rotatably mounted on the side wall of the adjusting rod 11 near its upper end, extending towards the axis of the rotating platform 2. The rubber rod 12 is perpendicular to the vertical rod 6, and the end of the rubber rod 12 near the axis of the rotating platform 2 is hemispherical. A bolt 13, threadedly connected to the vertical rod 6, is threaded through the vertical rod 6, and the end of the bolt 13 abuts against the side wall of the adjusting rod 11. As the vertical rod 6 approaches the axis of the rotary table 2 and clamps the optical glass, the rubber rod 12 gradually moves to a state of contact with the top of the optical glass (the hemispherical design of the rubber rod 12 reduces the probability of the rubber rod 12 obstructing the centering action of the optical glass), increasing the stability of the optical glass during rotation. By rotating the bolt 13 and separating the end of the bolt 13 from the side wall of the adjusting rod 11, the height of the adjusting rod 11 can be adjusted, thereby achieving the purpose of adjusting the distance between the bottom of the rubber rod 12 and the top of the rotary table 2, so that this distance is equal to the thickness of the optical glass to be processed, thus expanding the applicability of the automatic centering device.

[0036] A support base 15 is provided at the bottom of the first mounting groove 14, and a smooth layer is provided at the bottom of the support base 15. The smooth layer is a surface with a low coefficient of friction formed by polishing. An annular rubber pad 16 is fixed to the top of the support base 15, and a second mounting groove 17 is opened on the top of the support base 15. The electro-permanent magnet chuck 3 is fixed to the inner bottom wall of the second mounting groove 17, and a battery 18 electrically connected to the electro-permanent magnet chuck 3 is fixed to the inner bottom wall of the second mounting groove 17. The specific connection method between the electro-permanent magnet chuck 3 and the battery 18 is existing known technology and does not need to be described in detail. After the electro-permanent magnet chuck 3 is in operation, it can adsorb and position the optical glass. During the alignment of the optical glass with the vertical rod 6, the side wall of the vertical rod 6 contacts the edge of the optical glass. Since the bottom of the support base 15 is polished to form a smooth layer with a low coefficient of friction, and the top of the support base 15 is fixed with an annular rubber pad 16 with a high coefficient of friction, such as nitrile rubber, and the electro-permanent magnet chuck 3 is fixed on the support base 15, the optical glass drives the support base 15 to slide along the inner bottom wall of the first mounting groove 14, which is conducive to the alignment of the optical glass.

[0037] The above description is merely a preferred embodiment of this utility model. The protection scope of this utility model is not limited to the above embodiments. All technical solutions falling within the scope of this utility model's concept are protected by this utility model. It should be noted that for those skilled in the art, any improvements and modifications made without departing from the principle of this utility model should also be considered within the protection scope of this utility model.

Claims

1. An automatic alignment device for optical element processing, comprising a processing base (1), a rotary table (2) rotatably mounted on the top of the processing base (1), and an electro-permanent magnet chuck (3) disposed on the top of the rotary table (2), wherein the processing base (1) is provided with a rotating mechanism (4) for driving the rotary table (2) to rotate, characterized in that: The processing base (1) is provided with a horizontal plate (5) that is slidably connected to the side wall of the processing base (1). The horizontal plate (5) is provided with multiple plates that are evenly distributed about the axis of the rotary table (2). Each horizontal plate (5) is fixed with a vertical rod (6) at the top. The processing base (1) is provided with an adjustment mechanism (7) for driving multiple horizontal plates (5) to move closer or further away from each other at the same time.

2. The automatic alignment device for optical element processing according to claim 1, characterized in that: The processing base (1) has an internal cavity. The adjustment mechanism (7) includes an adjustment component (71). The adjustment component (71) includes a transmission sleeve (711) that is rotatably mounted on the inner top wall of the cavity and is vertically arranged, and an adjustment disk (712) that is fixedly sleeved on the transmission sleeve (711) and is horizontally arranged. Each of the horizontal plates (5) has an adjustment block (8) at its bottom. The top of the adjustment disk (712) has an arc-shaped through hole (9) that is slidably connected to the adjustment block (8). The axis of the arc-shaped through hole (9) is eccentrically set with the axis of the adjustment disk (712). The number of arc-shaped through holes (9) is equal to the number of adjustment blocks (8), and their positions correspond one-to-one. The adjustment mechanism (7) also includes a drive component (72) for driving the transmission sleeve (711) to rotate.

3. The automatic alignment device for optical element processing according to claim 2, characterized in that: The drive assembly (72) includes a worm gear (721) fixedly sleeved on the transmission sleeve (711), a worm (722) rotatably installed in the cavity and meshing with the worm gear (721), and an operating rod (723) fixed to one end of the worm (722). The operating rod (723) passes through the side wall of the machining base (1) and is rotatably connected. The drive assembly (72) also includes a rotating wheel (724) fixed to the end of the operating rod (723) away from the machining base (1).

4. An automatic alignment device for optical element processing according to claim 3, characterized in that: The rotating mechanism (4) includes a driven rod (41) that passes through the top of the processing base (1) and is rotatably connected to it, a driven bevel gear (42) that is fixedly sleeved on the driven rod (41), an active rod (43) that is rotatably installed on the inner wall of the cavity and perpendicular to the transmission rod, an active bevel gear (44) that is fixedly sleeved on the active rod (43) and meshes with the driven bevel gear (42), and a drive motor (45) that is fixed on the processing base (1) and drives the active rod (43) to rotate. The upper end of the driven rod (41) is fixed to the bottom of the rotary table (2). The transmission sleeve (711) is a cylindrical structure. The driven rod (41) passes through the interior of the transmission sleeve (711). The axis of the driven rod (41) coincides with the axis of the transmission sleeve (711) and the axis of the rotary table (2).

5. An automatic alignment device for optical element processing according to claim 1, characterized in that: The top of the horizontal plate (5) is rotatably mounted with a protective sleeve (10) sleeved on the outside of the vertical rod (6), and the axis of the protective sleeve (10) coincides with the axis of the vertical rod (6).

6. An automatic alignment device for optical element processing according to claim 5, characterized in that: The vertical rod (6) is a cylindrical structure. An adjusting rod (11) is provided inside the vertical rod (6) and slides with it. A rubber rod (12) extending toward the axis of the rotating table (2) is rotatably installed on the side wall of the adjusting rod (11) near the upper end of the adjusting rod (11). The rubber rod (12) and the vertical rod (6) are perpendicular to each other. A bolt (13) threadedly connected to the vertical rod (6) is provided through the vertical rod (6). The end of the bolt (13) abuts against the side wall of the adjusting rod (11).

7. An automatic alignment device for optical element processing according to claim 6, characterized in that: The end of the rubber rod (12) near the axis of the rotating platform (2) is hemispherical.

8. An automatic alignment device for optical element processing according to claim 1, characterized in that: The top of the rotating platform (2) is provided with a first mounting groove (14), and a support base (15) is provided at the bottom of the first mounting groove (14). The bottom of the support base (15) is provided with a smooth layer, and an annular rubber pad (16) is fixed at the top of the support base (15). The height of the top of the annular rubber pad (16) is higher than the height of the top of the rotating platform (2). The top of the support base (15) is provided with a second mounting groove (17), and the electro-permanent magnet chuck (3) is fixed on the inner bottom wall of the second mounting groove (17). A battery (18) electrically connected to the electro-permanent magnet chuck (3) is fixed on the inner bottom wall of the second mounting groove (17).

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