Polishing device

Abstract

The polishing device can be used for polishing an aluminum alloy workpiece and comprises a transmission mechanism, a brush part, a cutting part and a connecting base, at least part of the transmission mechanism is connected with the cutting part, and the transmission mechanism can drive the cutting part to rotate; the connecting seat is sleeved outside at least part of the transmission mechanism, and the transmission mechanism can drive the connecting seat to rotate; the brush part is connected with the connecting base, the connecting base can drive the brush part to rotate, and the brush part covers at least part of the cutting part. And normal operation can be achieved in a small space and a complex-shape space, and flash removal in the small space and the complex-shape space is achieved.

Description

Technical Field

[0001] The utility model relates to an aluminum alloy workpiece grinding device, in particular to a stir friction welding flash grinding device. Background Art

[0002] Friction stir welding (FSW) is a commonly used welding process for aluminum alloys. It utilizes the heat generated by friction between a high-speed rotating stir pin and the workpiece to plasticize the workpiece material. During the welding process, the high pressure generated by the stir pin causes the plastic material to squeeze out from both sides of the shoulder, forming a flash defect.

[0003] The existing flash removal process involves machining the workpiece surface after welding and then cleaning the workpiece after machining. Before flash removal, the workpiece must be fixed with a fixture. Currently, flash removal is done by a milling cutter machine and then polished with a brush. The milling cutter and brush are two independent devices, which take up a lot of space and are prone to collision with the fixture or workpiece. Especially when grinding and removing flash from workpieces with complex structures, the separate milling cutter and brush are large in size in the small or complex-shaped space formed by the workpiece and the fixed fixture. It is difficult to operate smoothly in a small or complex-shaped space and is more likely to interfere with the fixture or workpiece, resulting in poor workpiece polishing effect. Utility Model Content

[0004] The present application provides a grinding device that can operate smoothly in a small or complex-shaped space formed by a workpiece and a fixed tooling, thereby achieving a better grinding effect in the small or complex-shaped space.

[0005] The present application provides a grinding device that can be used for grinding aluminum alloy workpieces, including a transmission mechanism, a brush portion, a cutting portion, and a connecting seat. At least a portion of the transmission mechanism is connected to the cutting portion, and the transmission mechanism can drive the cutting portion to rotate; the connecting seat sleeve is disposed at least partially outside the transmission mechanism, and the transmission mechanism can drive the connecting seat to rotate; the brush portion is connected to the connecting seat, and the connecting seat can drive the brush portion to rotate, and the brush portion cover is disposed at least partially outside the cutting portion. In this arrangement, the transmission mechanism drives the cutting portion to rotate, the connecting seat sleeve is disposed at least partially outside the transmission mechanism, and the transmission mechanism can drive the connecting seat to rotate, the connecting seat can drive the brush portion to rotate, and the brush portion cover is disposed at least partially outside the cutting portion. This can reduce the volume occupied by the brush portion and the cutting portion. During the grinding process, the transmission mechanism operates to drive the brush portion and the cutting portion to rotate, effectively occupying a small volume, reducing the probability of interference with tooling and workpieces during the grinding process, and achieving a better grinding effect. The device can operate smoothly in small spaces and spaces with complex shapes, achieving a better grinding effect in small working spaces and spaces with complex shapes. BRIEF DESCRIPTION OF THE DRAWINGS

[0006] Figure 1This is a three-dimensional schematic diagram of a grinding device according to an embodiment of the present application;

[0007] Figure 2 for Figure 1 An exploded schematic diagram of the grinding device at a first angle is shown;

[0008] Figure 3 for Figure 1 An exploded schematic diagram of the grinding device at a second angle;

[0009] Figure 4 for Figure 1 An exploded schematic diagram of the grinding device at a third angle;

[0010] Figure 5 for Figure 1 The schematic diagram of the exploded main view of the grinding device shown;

[0011] Figure 6 for Figure 1 A schematic diagram of the coordination of the first external gear, the second external gear, and the internal gear portion of the grinding device shown;

[0012] Figure 7 for Figure 1 Another implementation of the gear train of the grinding device shown;

[0013] Figure 8 This is an exploded schematic diagram of a grinding device according to another embodiment of the present application;

[0014] Figure 9 This is an overall schematic diagram of a grinding device according to another embodiment of the present application;

[0015] Figure 10 for Figure 9 An exploded schematic diagram of the grinding device shown in the first perspective;

[0016] Figure 11 for Figure 9 An exploded schematic diagram of the grinding device from a second perspective;

[0017] Figure 12 for Figure 9 The schematic diagram of the exploded main view of the grinding device shown;

[0018] Reference numerals:

[0019] 110. First transmission shaft, 120. Second shaft, 130. Mounting plate, 140. Second pulley, 150. Spring, 160. Brush portion, 170. Connecting seat, 180. Housing, 111. Cutting portion, 112. First external gear, 1121. First tooth portion, 121. Second external gear, 122. First pulley, 123. Third external gear, 1211. Second tooth portion, 172. First connecting portion, 173. Second connecting portion, 171. Internal tooth portion, 712. Protrusion, 730. Connecting portion, 731. Through groove, 831. Bearing fixing seat, 8311. First bearing hole, 8312. Second bearing hole, 870. Sleeve, 871. First bearing, 880. Second bearing. DETAILED DESCRIPTION

[0020] The present application is further described in detail below in conjunction with specific implementation methods.

[0021] The grinding device of the present application can be used for grinding aluminum alloy workpieces, and is particularly suitable for grinding workpieces with complex structures. For example, aluminum alloy workpieces have defects such as burrs caused by welding or processing. Since the workpiece needs to be fixed with a fixed tool during grinding, when the workpiece structure is complex, using two independent milling cutters and brushes to operate the workpiece in the small space formed by the workpiece and the fixed tool can easily lead to incomplete burr removal and poor grinding quality.

[0022] As an implementation method, refer to Figure 1-Figure 7 The grinding device 100 includes a transmission mechanism, a brush portion 160, a cutting portion 111, and a connecting seat 170. At least a portion of the transmission mechanism is connected to the cutting portion 111, and the transmission mechanism can drive the cutting portion 111 to rotate. The connecting seat 170 is sleeved around at least a portion of the transmission mechanism, and the transmission mechanism can drive the connecting seat 170 to rotate. The brush portion 160 is connected to the connecting seat 170, and the connecting seat 170 can drive the brush portion 160 to rotate. The brush portion 160 is covered around at least a portion of the cutting portion 111. At least a portion of the cutting portion 111 protrudes from the connecting seat 170, and at least a portion of the brush portion 160 protrudes from the connecting seat 170. The cutting portion 111 and the brush portion 160 are located on the same side in the axial direction of the grinding device.

[0023] The transmission mechanism includes a first transmission shaft 110 and a gear train. The gear train connects the first transmission shaft 110 and the connecting base 170. The first transmission shaft 110 can drive the brush portion 160 to rotate. The first transmission shaft 110 is connected to the cutting portion 111 and can also drive the cutting portion 111 to rotate. The first transmission shaft 110 is connected to the gear train and the connecting base 170, driving the brush portion 160 connected to the connecting base 170 to rotate. This achieves a relatively simple transmission method, using a single power source to rotate the brush portion 160 and the cutting portion 111, and simplifies transmission control.

[0024] The gear train includes a second shaft 120, a first external gear 112, and a second external gear 121. The first transmission shaft 110 is fixedly connected to the first external gear 112 on its outer circumference, and the second shaft 120 is connected to the second external gear 121 on its outer circumference. The first external gear 112 and the second external gear 121 are matingly connected. An internal tooth portion 171 is provided on the inner circumference of the connecting base 170, and the second external gear 121 is matingly connected to the internal tooth portion 171. By fixing the first external gear 112 on its outer circumference, matingly connecting the second external gear 121 and the first external gear 112 on its outer circumference, and matingly connecting the second external gear 121 and the internal tooth portion 171, the internal tooth portion 171 and the second external gear 121 rotate in the same direction, while the second external gear 121 and the first external gear 112 rotate in opposite directions. The first external gear 112 and the first transmission shaft 111 rotate in the same direction, and the connecting base 170 and the brush portion 160 rotate in the same direction as the internal tooth portion 171, thereby achieving opposite rotation of the brush portion 160 and the cutting portion 111. The brush portion 160 and the cutting portion 111 turn in opposite directions, so that the cutting portion 111 and the brush portion 160 grind the workpiece from opposite directions, achieving a better grinding effect and being able to further and more thoroughly remove burrs.

[0025] Another implementation of the gear train includes a second shaft 120, a first external gear 112, a second external gear 121, and a third external gear 123. The outer periphery of the first transmission shaft 110 is fixedly connected to the first external gear 112, the outer periphery of the second shaft 120 is connected to the second external gear 121, the first external gear 112 is cooperatively connected to the second external gear 121, an inner tooth portion 171 is provided on the inner periphery of the connecting seat 170, the third external gear 123 is cooperatively connected to the second external gear 121, and the third external gear 123 is cooperatively connected to the inner tooth portion 171. The third external gear 123 rotates in opposite directions to the second external gear 121, the inner tooth portion 171 rotates in the same direction as the third external gear 123, the second external gear 121 rotates in opposite directions to the first external gear 112, the inner tooth portion 171 rotates in the same direction as the first external gear 112, the connecting seat 170 rotates in the same direction as the inner tooth portion 171, the brush portion 160 rotates in the same direction as the connecting seat 170, and the first external gear 112 rotates in the same direction as the cutting portion 111, thereby achieving the same rotation direction of the brush portion 160 and the cutting portion 111.

[0026] The grinding device also includes a buffer mechanism and a fixing mechanism. The fixing mechanism is sleeved around at least a portion of the outer periphery of the transmission mechanism. The buffer mechanism is disposed between the fixing mechanism and the connecting seat 170. The buffer mechanism enables the brush 160 to move axially along the grinding device. The buffer mechanism is disposed between the connecting seat 170 and the fixing mechanism, enabling the brush 160 to move axially along the grinding device, enabling floating grinding of the brush 160 along the axial direction of the grinding device, further and more thoroughly removing burrs and achieving the removal of fine burr residue at the root.

[0027] The buffer mechanism includes a spring 150, which is compressed between a connector 170 and a fixing mechanism. Spring 150 has a simple structure. When compressed between the connector 170 and the fixing mechanism, the connector 170 drives the brush 160 to float up and down along the axial direction to polish the burr, effectively removing any small structures remaining at the root of the burr, thereby removing the burr more thoroughly.

[0028] The fixing mechanism includes a mounting plate 130, a first pulley 122, and a second pulley 140. The mounting plate 130 is sleeved around at least a portion of the transmission mechanism. The mounting plate 130 is connected to a connecting seat 170. The first pulley 122 is interference-fitted with the second shaft 120. The first pulley 122 is connected to the mounting plate 130. The second pulley 140 is sleeved around at least a portion of the outer circumference of the mounting plate 130. A spring 150 is compressed between the second pulley 140 and the connecting seat 170. The mounting plate 130 is used to fix the first transmission shaft 110 and the second shaft 120. The first pulley 122 is interference-fitted with the second shaft 120. The first pulley 122 is connected to the mounting plate 130 to isolate the transmission between the second shaft 120 and the mounting plate 130, preventing relative axial sliding between the second shaft 120 and the mounting plate 130, thereby stably fixing the transmission mechanism. The spring 150 is compressed between the second pulley 140 and the connecting seat 170, and can drive the brush part 160 to move axially along the grinding device through the connecting seat 170, thereby realizing floating grinding to remove the residual at the root of the burr. It can also be used to buffer the vibration of the brush part 160 during the grinding operation, causing the internal parts of the grinding mechanism to vibrate against each other, thereby improving the stability and reliability of the grinding device.

[0029] The grinding device also includes a housing 180, which is sleeved over at least a portion of the transmission mechanism. The housing 180 is connected to at least a portion of the outer circumference of the second pulley 140 and is connected to the connecting base 170. The connecting base 170 includes a first connecting portion 172 and a second connecting portion 173. One end of the first connecting portion 172 is connected to the housing 180, and the end of the first connecting portion 172 remote from the housing 180 is connected to the second connecting portion 173. The end of the second connecting portion 173 remote from the first connecting portion 172 is connected to the brush 160. The width of the first connecting portion 172, perpendicular to the axial direction of the grinding device, gradually decreases from the end where it is connected to the housing 180 to the end where it is connected to the second connecting portion 173. The housing 180 sleeves over at least a portion of the transmission mechanism to protect the transmission mechanism from the operating environment and maintain a stable transmission effect. The housing 180 is at least partially connected to the outer periphery of the second pulley 140, which is then sleeved onto at least a portion of the outer periphery of the mounting plate 130. This arrangement isolates the transmission between the mounting plate 130 and the housing 180, preventing the movement of the mounting plate 130 from affecting the stability of the housing 180. The width of the first connecting portion 172, perpendicular to the axial direction of the grinding device, gradually decreases from the end where it connects to the housing 180 to the end where it connects to the second connecting portion 173. This further reduces the size of the brush portion 160 and the first connecting portion 172, enabling grinding operations in a smaller working space.

[0030] At least one threaded hole is symmetrically provided on the periphery of the connecting seat 170 , and at least one threaded hole is correspondingly provided on the periphery of the shell 180 . The threaded holes on the periphery of the connecting seat 170 and the threaded holes on the periphery of the shell 180 are fixedly connected by nuts.

[0031] During actual operation, the first transmission shaft 110 is connected to the power mechanism, which provides power to the transmission mechanism for cutting and grinding burrs. The grinding end of the cutting portion 111 has a blade edge to cut the burr structure. The brush portion 160 can be set as a steel brush to grind smaller burr residues and clean burr debris that falls on the surface of the workpiece after cutting. Optionally, the brush portion 160 is set in conjunction with the cutting portion 111. When the cutting portion 111 can achieve a more thorough burr removal effect, a cleaning brush such as a bristle brush or a plastic brush can also be selected to clean the burr debris.

[0032] In another embodiment, the second shaft 120 is designed to connect to the power mechanism, and the power is obtained through the second shaft 120 to drive the transmission mechanism, the gear system, the cutting part 111, and the brush part 160 to operate and grind and remove burrs.

[0033] As another embodiment of the present application, refer to Figure 8The transmission mechanism of the grinding mechanism 700 includes a first transmission shaft 110, a first end portion of a connecting seat 170 fixed to the brush portion 160, the connecting seat 170 having a through hole and a through slot 731 located around the through hole, at least a portion of the first transmission shaft 110 being located in the through hole, and a protrusion 712 provided on the outer wall of the first transmission shaft 110. The protrusion 712 cooperates with the through slot 731 to achieve circumferential limit, allowing the first transmission shaft 110 to drive the connecting seat 170 to rotate. The through slot 731 provided on the connecting seat 170 cooperates with the protrusion 712 provided on the outer wall of the first transmission shaft 110, and the brush portion 160 is fixed to one end portion of the connecting seat 170. The connection structure is simple, and the brush portion 160 and the cutting portion 111 rotate synchronously.

[0034] The polishing device 700 includes a buffer mechanism and a fixing mechanism. The fixing mechanism is sleeved around at least a portion of the outer periphery of the transmission mechanism. The buffer mechanism is positioned between the fixing mechanism and the connecting seat 170. The buffer mechanism enables the brush 160 to move axially along the polishing device to polish the remaining root of the flash, further achieving a more thorough polishing effect. The buffer mechanism is positioned between the fixing mechanism and the connecting seat 170 and can also be used to buffer the vibration of the brush 160 caused by polishing, thereby improving the stability of the polishing device. The buffer mechanism includes a spring 150, which is compressed between the connecting seat 170 and the fixing mechanism. The fixing mechanism includes a mounting plate 130 and a second pulley 140. The second pulley 140 is sleeved around at least a portion of the outer periphery of the mounting plate 130. The spring 150 is compressed between the second pulley 140 and the connecting seat 170. The spring 150 provides an axial force to the connecting seat 170 and the brush 160, causing the brush 160 to float up and down axially, effectively polishing and removing the remaining root of the flash, further improving the polishing effect. The housing 180 is sleeved on the outer periphery of the second pulley 140 to protect the transmission mechanism and the second pulley 140, prevent the external environment from affecting the transmission effect of the transmission mechanism, and achieve stable operation.

[0035] As another embodiment, referring to Figures 9-12 The transmission mechanism of the grinding device 800 includes a first transmission shaft 110, a second shaft 120, a first external gear 112, and a second external gear 121. The first external gear 112 is sleeved on the outside of the first transmission shaft 110, with a gap between the first external gear 112 and the first transmission shaft 110. The second external gear 121 is fixed to the outer periphery of the second shaft 120. The first external gear 112 and the second external gear 121 are cooperatively connected. The connecting seat 170 is transmission-connected to the first external gear 112. The first transmission shaft 110 is connected to the cutting portion 111. There is a gap between the first external gear 112 and the first transmission shaft 110, isolating the first external gear 112 from the first transmission shaft 110. The second external gear 121 is cooperatively connected to the first external gear 112. The connecting seat 170 is transmission-connected to the first external gear 112. The connecting seat 170 can drive the brush portion 160 to rotate. The second external gear 121 is fixed to the outer periphery of the second shaft 120.

[0036] The second shaft 120 receives external power and transmits it to the second external gear 121, the first external gear 112, the connecting seat 170, and the brush 160. The first transmission shaft 110 receives external power and transmits it to the cutting section 111. The brush 160 is rotated by controlling the second shaft 120, and the cutting section 111 is rotated by controlling the first transmission shaft 110. The brush 160 and the cutting section 111 can be controlled separately to flexibly cope with various scenarios. The brush 160 and the cutting section 111 can be controlled to move simultaneously or at different times. The direction of power rotation can also be adjusted to control the brush 160 and the cutting section 111 to rotate in the same or different directions. Furthermore, various grinding modes can be achieved, such as simultaneous rotation of the brush 160 and the cutting section 111, simultaneous rotation in different directions, simultaneous rotation in the same direction, or different rotation in different directions.

[0037] The grinding device 800 includes a buffer mechanism and a fixing mechanism. The fixing mechanism is sleeved on at least a portion of the outer circumference of the transmission mechanism. The buffer mechanism is arranged between the fixing mechanism and the connecting seat 170. The buffer mechanism can cause the brush portion 160 to move axially along the grinding device 800. The buffer mechanism includes a spring 150, and the spring 150 is compressed between the connecting seat 170 and the fixing mechanism. The spring 150 is compressed between the connecting seat 170 and the fixing mechanism, which can cause the brush portion 160 to move axially along the grinding device 800, achieving floating grinding and capable of more thoroughly grinding the burr structure. The buffer mechanism can also be other forms of structures that can provide axial force to the brush portion 160.

[0038] The fixing mechanism includes a bearing seat 831, a first bearing 871, and a second bearing 880. The first bearing 871 is sleeved on the first transmission shaft 110, and the second bearing 880 is sleeved on the second shaft 120. The first bearing 871 is connected to the bearing seat 831, and the second bearing 880 is connected to the bearing seat 831. The fixing mechanism also includes a sleeve 870, which is sleeved on the first transmission shaft 110 with a gap between the sleeve and the first transmission shaft 110. At least a portion of the sleeve 870 is outer-engaged with the first bearing 871, and at least a portion of the sleeve 870 at one end away from the first bearing 871 is in driving connection with the connecting seat 170. The bearing seat 831 fixes the first transmission shaft 110 and the second shaft 120. The first bearing 871 is sleeved on the first transmission shaft 110 and connected to the bearing seat 831. The first bearing 871 cooperates with the gap between the sleeve 870 and the first transmission shaft 110 to isolate the transmission between the bearing seat 831 and the first transmission shaft 110, and the second bearing 880 isolates the transmission between the second shaft 120 and the bearing seat 831, while keeping the first transmission shaft 110 and the second shaft 120 fixed, avoiding the influence of the rotation of the first transmission shaft 110 and the second shaft 120 on the fixing mechanism, maintaining the stability of the transmission mechanism, avoiding waste of power, and avoiding vibration inside the grinding device 800 caused by the transmission between the transmission mechanism and the fixing mechanism.

[0039] Specifically, a first bearing hole 8311 and a second bearing hole 8312 are provided in the bearing fixing seat 831. At least a portion of the first transmission shaft 110 passes through the first bearing hole 8311, and at least a portion of the second shaft 120 passes through the second bearing hole 8312. The first bearing 871 is disposed in the first bearing hole 8311, and the second bearing 880 is disposed in the second bearing hole 8312.

[0040] Connecting base 170 includes a first connecting portion 172 and a second connecting portion 173. The outer edge of second connecting portion 173 is rounded, and the portion where the first and second connecting portions 172 and 173 meet is inverted tapered. The width of first connecting portion 172 perpendicular to the axial direction gradually decreases from the end away from second connecting portion 173 to the end closer to second connecting portion 173. This arrangement reduces the outer diameter of brush portion 160, to which second connecting portion 173 is directly connected, further reducing the space occupied by the brush portion and facilitating the removal of flash in smaller spaces.

[0041] The grinding device 800 further includes a housing 180 , which is sleeved onto at least a portion of the transmission mechanism. The bearing fixing seat 831 is installed on the inner side of the housing 180 .

[0042] The grinding device further includes an air blowing unit for blowing air toward the workpiece being ground. The air blowing unit can be used to blow air toward the workpiece while the grinding unit is operating and / or after the grinding unit is operating, thereby further reducing aluminum alloy debris remaining on the aluminum alloy workpiece and improving the cleanliness of the aluminum alloy workpiece.

[0043] The grinding device in this application is applied to the grinding of burrs after friction stir welding of the flow channel plate, which can not only remove the burrs more thoroughly, but also improve the cleanliness of the product. After the burrs on the surface of the aluminum alloy workpiece after friction stir welding are removed, very few aluminum alloy debris remain in the aluminum alloy workpiece. It is applied to the same side of the friction stir welding surface with a plurality of holes, grooves and other structures. The aluminum alloy workpiece has a cavity, such as a fluid conducting cavity in the flow channel plate. Aluminum alloy debris falls into the fluid conducting cavity through the holes, grooves and other structures, which is extremely difficult to clean. In particular, aluminum alloy debris in a narrow fluid conducting cavity is more difficult to clean. By using the grinding device in this application, an aluminum alloy workpiece product with very little aluminum alloy debris remaining in the fluid conducting cavity can be obtained, thereby improving the cleanliness of the product and obtaining a better quality aluminum alloy workpiece product.

[0044] The grinding device provided in the present application is applied to the flow channel plate manufacturing method, and can directly grind and remove the flow channel plate surface in a small or complex working space, thereby improving the flatness of the flow channel plate surface and improving the quality of the flow channel plate.

[0045] The above-described embodiments merely represent several implementation methods of the present invention. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent. It should be noted that a person skilled in the art would be able to make various modifications and variations without departing from the spirit of the present application, and these modifications and variations fall within the scope of protection of the present invention.

Claims

1. A grinding device capable of grinding aluminum alloy workpieces, characterized by: The invention comprises a transmission mechanism, a brush portion (160), a cutting portion (111), and a connecting seat (170), wherein at least a portion of the transmission mechanism is connected to the cutting portion (111), and the transmission mechanism can drive the cutting portion (111) to rotate; the connecting seat (170) is sleeved outside at least a portion of the transmission mechanism, and the transmission mechanism can drive the connecting seat (170) to rotate; the brush portion (160) is connected to the connecting seat (170), and the connecting seat (170) can drive the brush portion (160) to rotate, and the brush portion (160) is covered outside at least a portion of the cutting portion (111).

2. The grinding device according to claim 1, characterized in that: At least part of the cutting portion (111) protrudes from the connecting seat (170), at least part of the brush portion (160) protrudes from the connecting seat (170), and the cutting portion (111) and the brush portion (160) are located on the same side in the axial direction of the grinding device.

3. The grinding device according to claim 1 or 2, characterized in that: The transmission mechanism comprises a first transmission shaft (110) and a gear train, wherein the gear train connects the first transmission shaft (110) and the connecting seat (170), the first transmission shaft (110) can drive the brush portion (160) to rotate, and the first transmission shaft (110) is connected to the cutting portion (111) and can drive the cutting portion (111) to rotate.

4. The grinding device according to claim 3, characterized in that: The gear train comprises a second shaft (120), a first external gear (112), and a second external gear (121); the outer periphery of the first transmission shaft (110) is fixedly connected to the first external gear (112); the outer periphery of the second shaft (120) is connected to the second external gear (121); the first external gear (112) and the second external gear (121) are cooperatively connected; an inner periphery of the connecting seat (170) is provided with an inner tooth portion (171); and the second external gear (121) and the inner tooth portion (171) are cooperatively connected; Alternatively, the gear train includes a second shaft (120), a first external gear (112), a second external gear (121), and a third external gear (123); the outer periphery of the first transmission shaft (110) is fixedly connected to the first external gear (112); the outer periphery of the second shaft (120) is connected to the second external gear (121); the first external gear (112) and the second external gear (121) are cooperatively connected; an inner tooth portion (171) is provided on the inner periphery of the connecting seat (170); the third external gear (123) and the second external gear (121) are cooperatively connected; and the third external gear (123) and the inner tooth portion (171) are cooperatively connected.

5. The grinding device according to claim 3, characterized in that: The transmission mechanism comprises a first transmission shaft (110), a second shaft (120), a first external gear (112), and a second external gear (121); the first external gear (112) is sleeved on the outside of the first transmission shaft (110), and a gap is provided between the first external gear (112) and the first transmission shaft (110); the second external gear (121) is fixed to the outer periphery of the second shaft (120); the first external gear (112) and the second external gear (121) are cooperatively connected; the connecting seat (170) is transmission-connected to the first external gear (112); and the first transmission shaft (110) is connected to the cutting portion (111).

6. The grinding device according to claim 1 or 2, characterized in that: The transmission mechanism includes a first transmission shaft (110), a first end portion of the connecting seat (170) is fixed to the brush portion (160), the connecting seat (170) has a through hole and a through slot (731) located around the through hole, at least a portion of the first transmission shaft (110) is located in the through hole, a convex portion (712) is provided on the outer wall of the first transmission shaft (110), the convex portion (712) cooperates with the through slot (731) to achieve circumferential limitation, and the first transmission shaft (110) can drive the connecting seat (170) to rotate.

7. The grinding device according to claim 4 or 5, characterized in that: The grinding device comprises a buffer mechanism and a fixing mechanism, wherein the fixing mechanism is sleeved on at least a portion of the outer periphery of the transmission mechanism, and the buffer mechanism is arranged between the fixing mechanism and the connecting seat (170). The buffer mechanism can enable the brush portion (160) to move axially along the grinding device.

8. The grinding device according to claim 7, characterized in that: The buffer mechanism comprises a spring (150), and the spring (150) is compressed between the connecting seat (170) and the fixing mechanism; The fixing mechanism includes a mounting plate (130), a first pulley (122), and a second pulley (140); the mounting plate (130) is sleeved on at least a portion of the transmission mechanism; the mounting plate (130) is connected to the connecting seat (170); the first pulley (122) and the second shaft (120) are interference fit; the first pulley (122) is connected to the mounting plate (130); the second pulley (140) is sleeved on at least a portion of the outer periphery of the mounting plate (130); and the spring (150) is compressed between the second pulley (140) and the connecting seat (170).

9. The grinding device according to claim 8, characterized in that: The fixing mechanism comprises a bearing seat (831), a first bearing (871), and a second bearing (880), wherein the first bearing (871) is sleeved on the first transmission shaft (110), and the second bearing (880) is sleeved on the second shaft (120), the first bearing (871) is connected to the bearing seat (831), and the second bearing (880) is connected to the bearing seat (831), and the fixing mechanism further comprises a sleeve (870), wherein the sleeve (870) is sleeved on the first transmission shaft (110) and has a gap with the first transmission shaft (110), at least a portion of the sleeve (870) is sleeved in the first bearing (871), and at least a portion of the sleeve (870) at one end away from the first bearing (871) is transmission-connected to the connecting seat (170).

10. The grinding device according to claim 8 or 9, characterized in that: The grinding device includes a shell (180), the shell (180) is sleeved on at least part of the outside of the transmission mechanism, the shell (180) is connected to the second pulley (140) or at least part of the outer periphery of the bearing seat (831) of the fixing mechanism, and the shell (180) is connected to the connecting seat (170); the connecting seat (170) includes a first connecting portion (172) and a second connecting portion (173), one end of the first connecting portion (172) is connected to the shell (180), the end of the first connecting portion (172) away from the shell (180) is connected to the second connecting portion (173), and the end of the second connecting portion (173) away from the first connecting portion (172) is connected to the brush portion (160), and the width of the first connecting portion (172) perpendicular to the axial direction of the grinding device gradually decreases from the end thereof connected to the shell (180) to the end thereof connected to the second connecting portion (173).

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