Polishing machine for bearing machining and polishing method thereof
By designing a bearing processing polishing machine including positioning components, polishing components and cleaning components, the problems of uneven polishing and poor cleanliness of polishing discs in the prior art are solved, and the efficient and high-quality bearing ring polishing effect is achieved.
Patent Information
- Application Number
- CN202510063234.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-01-15
- Publication Date
- 2025-03-18
AI Technical Summary
The existing polishing machine for bearing ring production cannot achieve sufficient and uniform polishing during the polishing process, and the cleanliness of the polishing discs are poor, which can easily cause scratches on the surface of the bearing ring.
A polishing machine for bearing processing including positioning components, polishing components and cleaning components is designed. The positioning assembly is used to position and move the bearing, the polishing assembly polishes the bearing end face, and the cleaning assembly is used to clean up debris on the polishing assembly.
Through this polishing machine, efficient bearing ring polishing can be achieved, ensuring polishing quality, and maintaining the cleanliness of the polishing disc through the use of cleaning components, avoiding damage to subsequent bearing rings.
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Figure CN119635460A_ABST
Abstract
Description
Technical Field
[0001] The invention belongs to the technical field of bearing production, and in particular relates to a polishing machine for bearing processing and a polishing method thereof. Background Art
[0002] After the bearing ring is processed, there will be a lot of impurities such as burrs and iron filings on the surface of the bearing ring, and the surface of the bearing ring will appear gray, so it is necessary to polish the surface of the bearing ring. However, the existing polishing machine for bearing ring production has the following shortcomings in actual operation:
[0003] First, during the polishing process, the surface of the bearing ring cannot be fully and evenly polished, which reduces the polishing effect, and the polishing height of the polishing disc cannot be flexibly adjusted;
[0004] Secondly, after each work of the polishing disc is completed, a large amount of polishing debris may be deposited on its surface, resulting in poor cleanliness on the working surface of the polishing disc. In the subsequent polishing process, these residual debris can easily cause serious scratches on the surface of the subsequent bearing ring. Summary of the invention
[0005] The purpose of the present invention is to provide a bearing processing polishing machine and a polishing method thereof in order to solve the above-mentioned technical problems, thereby achieving the effect of improving the polishing efficiency and quality.
[0006] In view of this, the present invention provides a polishing machine for bearing processing, comprising a machine base, on which is provided:
[0007] A positioning assembly, the positioning assembly is used to position the bearing and move the bearing;
[0008] A polishing assembly, which is arranged above the positioning assembly and is used to polish the upper end surface of the bearing on the positioning assembly;
[0009] A cleaning component is provided, wherein the cleaning component is used for cleaning debris on the polishing component.
[0010] In this technical solution, the bearing whose end face is to be polished is placed on the positioning assembly, the positioning assembly moves with the bearing, and the polishing assembly polishes the moving bearing with high polishing efficiency. Then the cleaning assembly cleans the debris on the polishing assembly in time to ensure the polishing quality of the bearing.
[0011] Furthermore, the positioning component includes:
[0012] An intermediate gear, which is rotatably arranged on the machine base and connected to the output end of the driving motor and can rotate in a circumferential direction;
[0013] Positioning gears, wherein a plurality of positioning gears are provided, and the plurality of positioning gears are arranged on the outer periphery of the intermediate gear and mesh with the intermediate gear, and the positioning gears are provided with positioning holes matching the shape and size of the outer periphery of the bearing;
[0014] The outer gear ring is fixedly arranged on the machine base, and the outer gear ring is arranged outside all the positioning gears and meshes with the positioning gears.
[0015] Furthermore, the positioning gear includes a gear body and an adjusting sleeve, the inner ring of the adjusting sleeve is the above-mentioned positioning hole, a keyway is provided on the inner ring of the gear body, a convex key matching the keyway is provided on the outer periphery of the adjusting sleeve, and a key connection is achieved between the keyway and the convex key.
[0016] In this technical solution, the driving motor drives the intermediate gear to rotate, thereby driving the positioning gear to rotate so that the positioning gear moves along the inner circumference of the outer gear ring. At the same time, the polishing assembly polishes the bearing in the positioning hole. The positioning gear is provided with an adjusting sleeve. The adjusting sleeve can be replaced according to the different outer diameters of the bearings that need to be polished, so that the positioning assembly can be suitable for bearings of different specifications.
[0017] Further, the polishing assembly includes:
[0018] A polishing disc, the polishing disc being used to contact the end surface of the bearing to polish the bearing;
[0019] A fixed frame is provided with a polishing motor fixedly thereon, and an output end of the polishing motor is connected to the polishing disc to drive the polishing disc to rotate.
[0020] Furthermore, a guide rod is provided between the polishing disc and the fixing frame, and an annular guide groove is provided on the side of the fixing frame facing the polishing disc. One end of the guide rod is fixedly connected to the polishing disc, and the other end is slidably provided in the annular guide groove.
[0021] In the technical solution, the polishing motor rotates with the polishing disc, and the provision of the annular guide groove and the guide rod can make the polishing disc rotate more stably.
[0022] Furthermore, the polishing assembly is connected to a lifting assembly, and the lifting assembly is used to adjust the vertical distance from the polishing assembly to the positioning assembly.
[0023] Furthermore, the lifting assembly includes:
[0024] A lifting seat, wherein the lifting seat is fixedly arranged on the machine base, and a lifting motor is fixedly arranged on the lifting seat;
[0025] A lifting screw rod, which is rotatably arranged on the lifting seat and connected to the output end of the lifting motor so as to be circumferentially rotatable;
[0026] A lifting slider, wherein the lifting slider is spirally connected to the lifting screw rod, and the lifting slider is fixedly connected to a fixing frame of the polishing assembly;
[0027] Among them, two guide columns are arranged on the lifting seat at both sides of the lifting screw rod and are parallel to the lifting screw rod, and the lifting slider is slidably sleeved on the guide columns.
[0028] In this technical solution, the lifting motor is started to rotate the lifting screw, driving the lifting slider and the polishing assembly to lift and lower along the length direction of the screw. By lifting the polishing assembly, bearings of different height specifications can be processed, and the polishing assembly can also be raised to facilitate the cleaning assembly to clean the polishing disc.
[0029] Further, the cleaning component includes:
[0030] A cleaning frame, the cleaning frame is fixedly arranged on the machine base and located outside the polishing assembly;
[0031] A cleaning cylinder, wherein the cleaning cylinder is fixedly arranged on the cleaning frame;
[0032] A fixed block is connected to the output end of the cleaning cylinder, a motor is fixedly arranged on the fixed block, and a cleaning brush is connected to the output end of the motor.
[0033] Furthermore, the motor output end is also provided with a loading and unloading groove, and the loading and unloading groove is located below the cleaning brush.
[0034] In this technical solution, when the polishing disc needs to be cleaned, the height of the polishing disc is adjusted to match the cleaning brush, and then the piston rod of the cleaning cylinder is extended so that the cleaning brush is located directly below the polishing disc. Finally, the motor is started to make the cleaning brush rotate circumferentially around the center of the polishing disc, and the debris on the polishing disc is cleaned and falls into the loading and unloading groove.
[0035] Further, the polishing method of the polishing machine comprises the following steps:
[0036] S1: Loading, lifting the polishing assembly through the lifting assembly, and placing the bearing into the positioning hole of the positioning assembly;
[0037] S2: polishing, lowering the polishing assembly through the lifting assembly, starting the polishing motor to rotate the polishing disc to polish the bearing end surface;
[0038] S3: After cleaning and polishing a predetermined number of bearings, raise the polishing assembly, adjust the height of the polishing disc to match the cleaning brush, then extend the piston rod of the cleaning cylinder so that the cleaning brush is directly under the polishing disc, and finally start the motor to make the cleaning brush rotate circumferentially around the center of the polishing disc, and clean the debris on the lower polishing disc and drop it into the loading and unloading groove.
[0039] The beneficial effects of the present invention are:
[0040] 1. Place the bearing whose end face is to be polished on the positioning assembly. The positioning assembly moves with the bearing, and the polishing assembly polishes the moving bearing with high polishing efficiency. Then the cleaning assembly cleans the debris on the polishing assembly in time to ensure the polishing quality of the bearing.
[0041] 2. The driving motor drives the intermediate gear to rotate, thereby driving the positioning gear to rotate so that the positioning gear moves along the inner circumference of the outer gear ring. At the same time, the polishing assembly polishes the bearing in the positioning hole. The positioning gear is provided with an adjusting sleeve. The adjusting sleeve can be replaced according to the different outer diameters of the bearings that need to be polished, so that the positioning assembly can be suitable for bearings of different specifications.
[0042] 3. The polishing motor drives the polishing disc to rotate, and the setting of the annular guide groove and the guide rod can make the polishing disc rotate more stably. BRIEF DESCRIPTION OF THE DRAWINGS
[0043] Figure 1 is a stereogram of the present invention;
[0044] Figure 2 is a front view of the present invention;
[0045] Figure 3 is a schematic diagram of the positioning component;
[0046] Figure 4 yes Figure 3 Exploded diagram of
[0047] Figure 5 It is a stereogram from another viewing angle of the present invention.
[0048] The symbols in the figure are:
[0049] 1. Machine base; 2. Positioning assembly; 3. Bearing; 4. Polishing assembly; 5. Cleaning assembly; 6. Intermediate gear; 7. Positioning gear; 8. Outer gear ring; 9. Gear body; 10. Adjusting sleeve; 11. Keyway; 12. Keyway; 13. Polishing disc; 14. Fixed frame; 15. Polishing motor; 16. Guide rod; 17. Annular guide groove; 18. Lifting seat; 19. Lifting motor; 20. Lifting screw rod; 21. Lifting slider; 22. Guide column; 23. Cleaning frame; 24. Cleaning cylinder; 25. Fixed block; 26. Motor; 27. Cleaning brush; 28. Loading and unloading groove. DETAILED DESCRIPTION
[0050] The following will be combined with the drawings in the embodiments of the present application to clearly describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments in the present application belong to the scope of protection of this application.
[0051] In the description of the present application, it should be noted that the terms used herein are only for describing specific embodiments, and are not intended to limit the exemplary embodiments according to the present application. For ease of description, the sizes of the various parts shown in the drawings are not drawn according to the actual proportional relationship. The technology, methods and equipment known to ordinary technicians in the relevant field may not be discussed in detail, but in appropriate cases, the technology, methods and equipment should be regarded as part of the authorization specification. In all examples shown and discussed here, any specific value should be interpreted as merely exemplary, rather than as a limitation. Therefore, other examples of the exemplary embodiments may have different values. It should be noted that similar numbers and letters represent similar items in the following drawings, so once an item is defined in one drawing, it does not need to be further discussed in subsequent drawings.
[0052] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application are used to distinguish similar objects, and are not used to describe a specific order or sequence. It should be understood that the data used in this way can be interchangeable under appropriate circumstances, so that the embodiments of the present application can be implemented in an order other than those illustrated or described here, and the objects distinguished by "first", "second", etc. are generally of one type, and the number of objects is not limited. For example, the first object can be one or more. In addition, "and / or" in the specification and claims represents at least one of the connected objects, and the character " / " generally indicates that the objects associated with each other are in an "or" relationship.
[0053] It should be noted that, in the description of the present application, the orientation or positional relationship indicated by terms such as "front, back, up, down, left, right", "lateral, vertical, perpendicular, horizontal" and "top, bottom" are usually based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description. Unless otherwise stated, these orientation words 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, and therefore cannot be understood as limiting the scope of protection of the present application; the orientation words "inside and outside" refer to the inside and outside relative to the contour of each component itself.
[0054] It should be noted that, in the present application, the terms "comprise", "include" or any other variant thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, an element defined by the sentence "comprises one..." does not exclude the presence of other identical elements in the process, method, article or device including the element. In addition, it should be noted that the scope of the method and device in the embodiment of the present application is not limited to performing functions in the order shown or discussed, and may also include performing functions in a substantially simultaneous manner or in reverse order according to the functions involved, for example, the described method may be performed in an order different from that described, and various steps may also be added, omitted, or combined. In addition, the features described with reference to certain examples may be combined in other examples.
[0055] Embodiment 1
[0056] like Figure 1-5 As shown, a polishing machine for processing a bearing 3 includes a machine base 1, on which is disposed:
[0057] A positioning assembly 2, wherein the positioning assembly 2 is used to position the bearing 3 and move the bearing 3;
[0058] A polishing assembly 4, wherein the polishing assembly 4 is arranged above the positioning assembly 2 and is used for polishing the upper end surface of the bearing 3 on the positioning assembly 2;
[0059] The cleaning component 5 is used to clean the debris on the polishing component 4.
[0060] The bearing 3 whose end face is to be polished is placed on the positioning component 2. The positioning component 2 moves with the bearing 3, and the polishing component 4 polishes the moving bearing 3 with high polishing efficiency. Then the cleaning component 5 cleans the debris on the polishing component 4 in time to ensure the polishing quality of the bearing 3.
[0061] The positioning component 2 comprises:
[0062] An intermediate gear 6, which is rotatably disposed on the base 1 and connected to the output end of the driving motor so as to be circumferentially rotatable;
[0063] Positioning gears 7, wherein a plurality of positioning gears 7 are provided, and the plurality of positioning gears 7 are arranged on the outer periphery of the intermediate gear 6 and mesh with the intermediate gear 6, and a positioning hole matching the shape and size of the outer periphery of the bearing 3 is provided on the positioning gear 7;
[0064] The outer gear ring 8 is fixedly disposed on the machine base 1 , and the outer gear ring 8 surrounds the outside of all the positioning gears 7 and meshes with the positioning gears 7 .
[0065] The positioning gear 7 includes a gear body 9 and an adjusting sleeve 10. The inner ring of the adjusting sleeve 10 is the above-mentioned positioning hole. A keyway 11 is provided on the inner ring of the gear body 9. A convex key 12 matching the keyway 11 is provided on the outer periphery of the adjusting sleeve 10. A key connection is achieved between the keyway 11 and the convex key 12.
[0066] The driving motor drives the intermediate gear 6 to rotate, thereby driving the positioning gear 7 to rotate so that the positioning gear 7 moves along the inner circumference of the outer gear ring 8. At the same time, the polishing component 4 polishes the bearing 3 in the positioning hole. The positioning gear 7 is provided with an adjusting sleeve 10. The adjusting sleeve 10 can be replaced according to the different outer diameters of the bearing 3 that needs to be polished, so that the positioning component 2 can be suitable for bearings 3 of different specifications.
[0067] Embodiment 2
[0068] The polishing assembly 4 comprises:
[0069] A polishing disc 13, wherein the polishing disc 13 is used to contact the end surface of the bearing 3 to polish the bearing 3;
[0070] A fixed frame 14 is provided with a polishing motor 15 fixedly mounted on the fixed frame 14 . The output end of the polishing motor 15 is connected to the polishing disc 13 to drive the polishing disc 13 to rotate.
[0071] A guide rod 16 is provided between the polishing disc 13 and the fixing frame 14 . An annular guide groove 17 is provided on the side of the fixing frame 14 facing the polishing disc 13 . One end of the guide rod 16 is fixedly connected to the polishing disc 13 , and the other end is slidably disposed in the annular guide groove 17 .
[0072] The polishing motor 15 drives the polishing plate 13 to rotate, and the arrangement of the annular guide groove 17 and the guide rod 16 can make the polishing plate 13 rotate more stably.
[0073] The polishing assembly 4 is connected to the lifting assembly, and the lifting assembly is used to adjust the vertical distance from the polishing assembly 4 to the positioning assembly 2.
[0074] Embodiment 3
[0075] The lifting assembly comprises:
[0076] A lifting seat 18, wherein the lifting seat 18 is fixedly arranged on the machine base 1, and a lifting motor 19 is fixedly arranged on the lifting seat 18;
[0077] A lifting screw 20, which is rotatably disposed on the lifting seat 18 and connected to the output end of the lifting motor 19 so as to be rotatable in a circumferential direction;
[0078] A lifting slider 21, wherein the lifting slider 21 is spirally connected to the lifting screw 20, and the lifting slider 21 is fixedly connected to the fixing frame 14 of the polishing assembly 4;
[0079] Among them, two guide posts 22 are arranged on the lifting seat 18 at both sides of the lifting screw 20 and are parallel to the lifting screw 20 , and the lifting slider 21 is slidably sleeved on the guide posts 22 .
[0080] Start the lifting motor 19 to rotate the lifting screw 20, driving the lifting slider 21 to lift the polishing assembly 4 along the length direction of the screw. By lifting the polishing assembly 4, bearings 3 of different height specifications can be processed, and the polishing assembly 4 can also be raised to facilitate the cleaning assembly 5 to clean the polishing disc 13.
[0081] Embodiment 4
[0082] The cleaning component 5 comprises:
[0083] A cleaning frame 23, wherein the cleaning frame 23 is fixedly arranged on the machine base 1 and located outside the polishing assembly 4;
[0084] A cleaning cylinder 24, wherein the cleaning cylinder 24 is fixedly arranged on the cleaning frame 23;
[0085] The fixing block 25 is connected to the output end of the cleaning cylinder 24 . A motor 26 is fixedly arranged on the fixing block 25 . A cleaning brush 27 is connected to the output end of the motor 26 .
[0086] The output end of the motor 26 is also provided with a receiving and unloading groove 28 , and the receiving and unloading groove 28 is located below the cleaning brush 27 .
[0087] When the polishing disc 13 needs to be cleaned, the height of the polishing disc 13 is adjusted to match the cleaning brush 27, and then the piston rod of the cleaning cylinder 24 is extended so that the cleaning brush 27 is located directly below the polishing disc 13. Finally, the motor 26 is started to make the cleaning brush 27 rotate circumferentially around the center of the polishing disc 13, and the debris on the polishing disc 13 is cleaned and falls into the loading and unloading groove 28.
[0088] The polishing method of the polishing machine comprises the following steps:
[0089] S1: Loading, raising the polishing assembly 4 by the lifting assembly, and placing the bearing 3 into the positioning hole of the positioning assembly 2;
[0090] S2: polishing, lowering the polishing assembly 4 through the lifting assembly, starting the polishing motor 15 to rotate the polishing disc to polish the end surface of the bearing 3;
[0091] S3: After cleaning and polishing a predetermined number of bearings 3, raise the polishing assembly 4, adjust the height of the polishing disc 13 to match the cleaning brush 27, then extend the piston rod of the cleaning cylinder 24 so that the cleaning brush 27 is located directly below the polishing disc 13, and finally start the motor 26 to make the cleaning brush 27 rotate circumferentially around the center of the polishing disc 13, and clean the debris on the polishing disc 13 and drop it into the loading and unloading groove 28.
[0092] The embodiments of the present application are described above in conjunction with the accompanying drawings. In the absence of conflict, the embodiments in the present application and the features in the embodiments can be combined with each other. The present application is not limited to the above-mentioned specific implementation methods. The above-mentioned specific implementation methods are merely illustrative and not restrictive. Under the guidance of the present application, ordinary technicians in this field can also make many forms without departing from the purpose of the present application and the scope of protection of the claims, all of which are within the protection of the present application.
Claims
1. A polishing machine for bearing (3) processing, characterized in that , comprising a base (1), on which is disposed: A positioning assembly (2), wherein the positioning assembly (2) is used to position the bearing (3) and move the bearing (3); A polishing assembly (4), the polishing assembly (4) being arranged above the positioning assembly (2) and being used for polishing the upper end surface of the bearing (3) on the positioning assembly (2); A cleaning component (5) is used to clean debris on the polishing component (4).
2. A polishing machine for bearing (3) processing according to claim 1, characterized in that: The positioning component (2) comprises: An intermediate gear (6), the intermediate gear (6) being rotatably disposed on the machine base (1) and being connected to the output end of the driving motor so as to be rotatable in a circumferential direction; A positioning gear (7), wherein a plurality of positioning gears (7) are provided, the plurality of positioning gears (7) are arranged on the outer periphery of the intermediate gear (6) and mesh with the intermediate gear (6), and a positioning hole matching the shape and size of the outer periphery of the bearing (3) is provided on the positioning gear (7); An outer gear ring (8) is fixedly arranged on the machine base (1), and the outer gear ring (8) is arranged outside all the positioning gears (7) and meshes with the positioning gears (7).
3. A polishing machine for bearing (3) processing according to claim 2, characterized in that: The positioning gear (7) comprises a gear body (9) and an adjusting sleeve (10); the inner ring of the adjusting sleeve (10) is the positioning hole; a keyway (11) is provided on the inner ring of the gear body (9); a convex key (12) matching the keyway (11) is provided on the outer periphery of the adjusting sleeve (10); and a key connection is achieved between the keyway (11) and the convex key (12).
4. A polishing machine for bearing (3) processing according to claim 2, characterized in that: The polishing assembly (4) comprises: A polishing disc (13), wherein the polishing disc (13) is used to contact the end surface of the bearing (3) to polish the bearing (3); A fixed frame (14) is provided with a polishing motor (15) fixedly mounted on the fixed frame (14); an output end of the polishing motor (15) is connected to the polishing disc (13) for driving the polishing disc (13) to rotate.
5. A polishing machine for bearing (3) processing according to claim 4, characterized in that: A guide rod (16) is arranged between the polishing disc (13) and the fixed frame (14); an annular guide groove (17) is arranged on one side of the fixed frame (14) facing the polishing disc (13); one end of the guide rod (16) is fixedly connected to the polishing disc (13), and the other end is slidably arranged in the annular guide groove (17).
6. A polishing machine for bearing (3) processing according to claim 4, characterized in that: The polishing assembly (4) is connected to a lifting assembly, and the lifting assembly is used to adjust the vertical distance between the polishing assembly (4) and the positioning assembly (2).
7. A polishing machine for bearing (3) processing according to claim 6, characterized in that: The lifting assembly comprises: A lifting seat (18), wherein the lifting seat (18) is fixedly arranged on the machine base (1), and a lifting motor (19) is fixedly arranged on the lifting seat (18); A lifting screw rod (20), the lifting screw rod (20) is rotatably disposed on the lifting seat (18) and is connected to the output end of the lifting motor (19) so as to be rotatable in a circumferential direction; A lifting slider (21), wherein the lifting slider (21) is spirally connected to the lifting screw rod (20), and the lifting slider (21) is fixedly connected to a fixing frame (14) of the polishing assembly (4); Wherein, two guide posts (22) are arranged on the lifting seat (18) at both sides of the lifting screw rod (20) and are parallel to the lifting screw rod (20), and the lifting slider (21) is slidably sleeved on the guide posts (22).
8. A polishing machine for bearing (3) processing according to claim 7, characterized in that: The cleaning component (5) comprises: A cleaning frame (23), wherein the cleaning frame (23) is fixedly arranged on the machine base (1) and is located outside the polishing assembly (4); A cleaning cylinder (24), wherein the cleaning cylinder (24) is fixedly arranged on the cleaning frame (23); A fixed block (25) is connected to the output end of the cleaning cylinder (24). A motor (26) is fixedly arranged on the fixed block (25), and a cleaning brush (27) is connected to the output end of the motor (26).
9. A polishing machine for bearing (3) processing according to claim 8, characterized in that: The output end of the motor (26) is also provided with a receiving and unloading groove (28), and the receiving and unloading groove (28) is located below the cleaning brush (27).
10. A polishing machine for bearing (3) processing according to claim 9, characterized in that: The polishing method of the polishing machine comprises the following steps: S1: Loading, raising the polishing assembly (4) by means of the lifting assembly, and placing the bearing (3) into the positioning hole of the positioning assembly (2); S2: polishing, lowering the polishing assembly (4) through the lifting assembly, starting the polishing motor (15) to rotate the polishing disc (13) to polish the end surface of the bearing (3); S3: After cleaning and polishing a predetermined number of bearings (3), the polishing assembly (4) is raised, and the height of the polishing disc (13) is adjusted to match the height of the cleaning brush (27). Then, the piston rod of the cleaning cylinder (24) is extended so that the cleaning brush (27) is located directly below the polishing disc (13). Finally, the motor (26) is started to make the cleaning brush (27) rotate in a circumferential direction around the center of the polishing disc (13), and the debris on the lower polishing disc (13) is cleaned and falls into the loading and unloading groove (28).
Citation Information
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