3C product polishing device

Abstract

The invention discloses a 3C product polishing device which comprises a mounting base and a round cavity formed in the mounting base, a first deep groove bearing and a first fixing ring are embedded in the round cavity, and a plurality of first magnetic cores with opposite adjacent magnetic poles are evenly distributed on the first fixing ring. The cylinder shaft is fixed in the circular cavity through a first deep groove bearing, a second deep groove bearing is embedded in an eccentric circular groove 43 of the cylinder shaft and penetrates into the rotating shaft, the top end of the rotating shaft is connected with the grinding head, and the outer wall of the rotating shaft is sleeved with a second fixing ring and a plurality of second magnetic cores with the same magnetic pole. The driving piece drives the barrel shaft to rotate around the axis of the barrel shaft to drive the rotating shaft and the grinding head to do eccentric grinding motion. By means of interaction of the radial magnetic field of the first fixing ring and the divergent magnetic field of the second fixing ring, magnetic field force opposite to centrifugal force is generated when the rotating shaft rotates eccentrically, unbalanced force is offset, vibration is remarkably reduced, and grinding uniformity and equipment stability are improved. Through the synergistic effect of magnetic force dynamic balance and a bearing structure, the device has the functions of efficient grinding and vibration reduction, and the service life of equipment is prolonged.

Description

Technical Field

[0001] This application relates to the technical field of 3C product processing equipment. More specifically, it relates to a 3C product grinding device. Background Art

[0002] The so-called 3C products refer to the combination of computers, communications, and consumer electronic products, also known as information appliances. In the grinding of 3C products, high surface quality is required. The grinding head for eccentric grinding moves in a random orbit, which can effectively reduce surface defects such as scratches and swirl marks, and is particularly suitable for 3C products with high requirements for surface finish.

[0003] In the related art, the grinding head is connected to the eccentric shaft, and the center of the eccentric shaft does not coincide with the rotation center of the grinding head, so that the grinding head generates an irregular orbital motion when rotating. The eccentric shaft is connected to the drive shaft of the motor through a coupling to realize the rotation of the grinding head driven by the motor. The connection method between the eccentric shaft and the motor through the coupling is usually a rigid connection. Since the rotation of the grinding head generates centrifugal force and the direction of the centrifugal force changes continuously, a periodic unbalanced force is generated during the movement of the grinding head. The unbalanced force of the grinding head will be directly transmitted to the whole equipment through the rigid connection, which is likely to cause the vibration of the whole equipment. The vibration of the equipment will lead to uneven grinding, affecting the surface finish and accuracy, and the long-term vibration will accelerate the wear of the equipment parts and reduce the service life of the equipment. Summary of the Invention

[0004] In order to solve the problem that the eccentric grinding device in the related art is prone to vibration, which will lead to uneven grinding and reduce the service life of the equipment, this application provides a 3C product grinding device.

[0005] A 3C product grinding device, including a mounting base, the mounting base is provided with a circular cavity penetrating through itself, a first deep groove bearing and a first fixing ring are fixedly embedded in the circular cavity, a barrel shaft is press-fitted into the inner ring hole of the first deep groove bearing, and the barrel shaft penetrates into the inner hole of the first fixing ring. A plurality of first magnetic cores are fixedly arranged on the first fixing ring and are evenly distributed around its center, and the magnetic poles of adjacent two of the first magnetic cores are opposite. The barrel shaft is provided with a circular groove and the axis of the barrel shaft is not on the same straight line as the center of the circular groove. A second deep groove bearing is fixedly embedded in the circular groove, a rotating shaft is press-fitted into the inner ring hole of the second deep groove bearing, the rotating shaft penetrates out of the top of the mounting base and its top end is connected with a grinding head. A second fixing ring is also press-fitted on the outer wall of the rotating shaft, the second fixing ring is aligned with the first fixing ring, and a plurality of second magnetic cores are fixedly arranged on the second fixing ring and are evenly distributed around its center. The magnetic poles of the plurality of second magnetic cores are the same. There are gaps between the first fixing ring and the second fixing ring and the barrel shaft. The barrel shaft is made of non-magnetic material. A driving member is also fixedly arranged at the bottom of the mounting base, and the driving member is connected with the barrel shaft to drive the barrel shaft to rotate around its own center.

[0006] Preferably, a plurality of first square grooves are concavely arranged on the inner hole side wall of the first fixing ring and are evenly distributed around its center. The first magnetic core is square and matches the length and width dimensions of the first square groove and is embedded in the first square groove for fixation. A plurality of second square grooves are concavely arranged on the outer side wall of the second fixing ring and are evenly distributed around its center. The second magnetic core is square and matches the length and width dimensions of the second square groove and is embedded in the second square groove for fixation.

[0007] Preferably, first limiting protrusions are convexly arranged on the opposite side walls of the first square groove of the first fixing ring, and the distance from the first limiting protrusion to the bottom surface of the first square groove matches the thickness of the first magnetic core. Second limiting protrusions are convexly arranged on the opposite side walls of the second square groove of the second fixing ring, and the distance from the second limiting protrusion to the top surface of the second square groove matches the thickness of the first magnetic core.

[0008] Preferably, the number of the first deep groove bearings is at least two, and the outer rings of the two first deep groove bearings clamp the first fixing ring up and down to fix the first fixing ring.

[0009] Preferably, first convex platforms are formed in the circular cavity of the mounting base and are arranged up and down. The first deep groove bearing and the first fixing ring are located between the two first convex platforms, and one of the first convex platforms located above presses against the top surface of the outer ring of the first deep groove bearing at the uppermost end of the circular cavity, and the other first convex platform presses against the bottom surface of the outer ring of the first deep groove bearing at the lowermost end of the circular cavity.

[0010] Preferably, the number of the second deep groove bearings is at least two, and the inner rings of the two second deep groove bearings clamp the second fixing ring up and down to fix the second fixing ring.

[0011] Preferably, second bosses are formed at both the upper and lower ends of the cylindrical shaft in the circular groove. The second deep groove bearings and the second fixing ring are both located between the two second bosses, and one of the second bosses at the top presses against the top surface of the outer ring of one of the second deep groove bearings at the uppermost end in the circular groove, and the other second boss presses against the bottom surface of the outer ring of the second deep groove bearing at the lowermost end of the circular groove.

[0012] Preferably, a first annular groove is formed at the top end of the mounting seat in the circular cavity, and a first sound insulation sealing ring is embedded in the annular groove. The first sound insulation sealing ring abuts against the outer wall of the cylindrical shaft. A second annular groove is also formed on the bottom surface of the mounting seat, and a second sound insulation sealing ring is embedded in the second annular groove. When the driving member is fixed to the bottom of the mounting seat, it is in tight fit with the second sound insulation sealing ring.

[0013] Preferably, the driving member is a servo motor, and the servo motor is connected to the cylindrical shaft through a coupling.

[0014] The beneficial technical effects of this application are as follows: The support of the cylindrical shaft by the first deep groove bearing enables the cylindrical shaft to be firmly fixed in the circular cavity and enables the cylindrical shaft to rotate stably in the circular cavity. The support of the rotating shaft by the second deep groove bearing enables the rotating shaft to be firmly fixed in the circular groove provided on the cylindrical shaft and rotate stably in the circular groove. Since the centers of the circular groove and the cylindrical shaft are not on the same straight line, the rotating shaft is restricted to the center of the circular groove by the first deep groove bearing. Therefore, when the cylindrical shaft rotates around its own axis, it drives the rotating shaft and the grinding head connected to the rotating shaft to perform eccentric rotation, thereby realizing eccentric grinding of the product. Through the first magnetic cores arranged around the center of the first fixing ring, and the magnetic poles of adjacent two first magnetic attractions being opposite, the direction of the magnetic field of the first fixing ring is generally radial (i.e., pointing to the center of rotation) as a whole. Through the second magnetic cores arranged around the center of the second fixing ring, and the magnetic poles of the second magnetic cores being the same, the direction of the magnetic field of the second fixing ring is divergent outward (i.e., pointing to the second magnetic ring). Since the first fixing ring is fixed by press-fitting into the circular cavity, and the second fixing ring is press-fitted into the rotating shaft through the inner hole, the centers of the first fixing ring and the second fixing ring are not on the same straight line. The second fixing ring rotates eccentrically with the rotating shaft. Therefore, the second fixing ring is subjected to a magnetic force opposite to the centrifugal force at the eccentric position, thereby realizing the cancellation of the unbalanced force generated by the centrifugation of the rotating shaft and the grinding head, achieving the purpose of reducing vibration, making the grinding uniform, and being beneficial to improving the service life of the equipment. Description of the Drawings

[0015] Figure 1It is a three-dimensional structure diagram of a 3C product grinding device according to this embodiment.

[0016] Figure 2 It is an exploded view of a 3C product grinding device according to this embodiment.

[0017] Figure 3 It is a sectional view of a 3C product grinding device according to this embodiment.

[0018] Figure 4 It is a schematic structural diagram of the first fixing ring and the second fixing ring according to this embodiment.

[0019] Reference numerals: 1, mounting base; 11, body block; 12, bottom block; 121, second sound insulation sealing ring; 13, top cover; 131, first sound insulation sealing ring; 14, circular cavity; 15, first boss; 2, first deep groove bearing; 3, first fixing ring; 31, first square groove; 32, first magnetic core; 33, first limiting protrusion; 4, barrel shaft; 41, cylindrical body; 42, circular end cover; 421, third sound insulation sealing ring; 43, circular groove; 44, second boss; 5, second deep groove bearing; 6, rotating shaft; 61, grinding head; 7, second fixing ring; 71, second square groove; 72, second magnetic core; 73, second limiting protrusion; 8, driving member; 9, counterweight block; Detailed implementation manners

[0020] Next, the technical solutions in the embodiments of the present application will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present application.

[0021] Refer to Figures 1-3, a 3C product grinding device, including a mounting base 1. The mounting base 1 includes a body block 11, a bottom block 12 and a top cover 13. The bottom block 12 is fixed to the bottom end of the body block 11 by bolts, and the top cover 13 is locked to the top end of the body block 11 by bolts. The mounting base 1 is provided with a circular cavity 14 passing through itself. The circular cavity 14 is formed in sections on the body block 11 and the bottom block 12. The top cover 13 is provided with a circular hole communicating with the circular cavity 14. At the top end of the inner wall of the circular cavity 14 in the body block 11, a first boss 15 is integrally formed. At the top end of the inner wall of the circular cavity 14 in the bottom block 12, another first boss 15 is integrally formed. A first deep groove bearing 2 and a first fixing ring 3 are fixedly embedded in the circular cavity 14 of the mounting base 1. And the number of the first deep groove bearings 2 is three. The three first deep groove bearings 2 are arranged in sequence from the upper end to the lower end of the circular cavity 14. Among them, the first fixing ring 3 is located between the first and the second first deep groove bearings 2, and the opposite two surfaces of the first fixing ring 3 are respectively abutted against the outer rings of the two first deep groove bearings 2. At the same time, the first boss 15 at the top of the body block 11 presses against the top surface of the outer ring of the first first deep groove bearing 2, and the first boss 15 at the top of the bottom block 12 presses against the bottom surface of the outer ring of the third deep groove bearing. The three first deep groove bearings 2 and the first fixing ring 3 are further clamped and fixed by the two first bosses 15.

[0022] Refer to Figures 1-3, a barrel shaft 4 is press-fitted into the inner ring holes of the three first deep groove bearings 2 in common, and the barrel shaft 4 is inserted into the inner hole of the first fixing ring 3. The barrel shaft 4 includes a cylindrical body 41 and a circular end cover 42. The cylindrical body 41 is provided with a circular groove 43 extending downward from its top surface. The axis of the barrel shaft 4 and the center of the circular groove 43 are not on the same straight line. The inner wall of the top end of the circular groove 43 is provided with a first thread, and the outer periphery of the circular end cover 42 is provided with a second thread matching the first thread. The circular end cover 42 is threadedly connected to the top end of the circular groove 43 of the circular body. And a perforation is provided in the middle of the circular end cover 42. A second deep groove bearing 5 is fixedly embedded in the circular groove 43, and the number of the second deep groove bearings 5 is two. A rotating shaft 6 is press-fitted into the inner ring holes of the two second deep groove bearings 5 in common. The rotating shaft 6 passes through the barrel shaft 4 through the perforation and extends out to the top of the mounting seat 1. And a grinding head 61 concentric with the rotating shaft 6 is connected to the top end of the rotating shaft 6. Abrasive is installed through the grinding head 61. A second fixing ring 7 is also press-fitted onto the outer wall of the rotating shaft 6. The second fixing ring 7 is located between the two second deep groove bearings 5. And the second fixing ring 7 is arranged in alignment with the first fixing ring 3. The inner rings of the two second deep groove bearings 5 respectively abut against the upper and lower side surfaces of the second fixing ring 7 to clamp the second fixing ring 7, further fixing the second fixing ring 7. And a second boss 44 is convexly formed at the bottom end of the circular end cover 42. Another second boss 44 is convexly formed on the inner wall bottom end of the circular groove 43 of the cylindrical body 41. One second boss 44 presses against the top surface of the outer ring of the second deep groove bearing 5 above, and the other second boss 44 presses against the bottom surface of the outer ring of the second deep groove bearing 5 below. The two second bosses 44 clamp the two second deep groove bearings 5 and the second fixing ring 7, further locking the two second deep groove bearings 5 in the circular groove 43.

[0023] Refer to Figures 3-4 , a plurality of first square grooves 31 evenly arranged around its center are recessed in the inner hole side wall of the first fixing ring 3. A first magnetic core 32 is embedded in each first square groove 31. The first magnetic core 32 is square and matches the length and width dimensions of the first square groove 31. And the first fixing ring 3 is convexly provided with first limiting protrusions 33 on the opposite side walls of the first square groove 31. The distance from the first limiting protrusion 33 to the bottom surface of the first square groove 31 matches the thickness of the first magnetic core 32, so that the first magnetic core 32 is not easily separated from the opening end of the first-shaped groove of the first fixing ring 3. And the magnetic poles of two adjacent first magnetic cores 32 are designed to be opposite, so that the first fixing ring 3 has a magnetic field force pointing to the axis of the barrel shaft 4.

[0024] Refer to Figures 3-4, on the outer sidewall of the second fixing ring 7, a plurality of second square grooves 71 are recessed and evenly arranged around its center. A second magnetic core 72 is embedded in each second square groove 71. The second magnetic core 72 is square and matches the length and width dimensions of the first square groove 31. And on the opposite sidewalls of the first square groove 31 of the second fixing ring 7, second limiting protrusions 73 are convexly provided. The distance from the second limiting protrusion 73 to the second square groove 71 matches the thickness of the second magnetic core 72, so that the second magnetic core 72 is not easily separated from the opening end of the second square groove 71 and the magnetic poles of the plurality of second magnetic cores 72 are the same, making the magnetic force of the second fixing ring 7 diverge to the first fixing ring 3.

[0025] There is a gap between the first fixing ring 3 and the second fixing ring 7 and the barrel shaft 4, and it is not easy to interfere with the barrel shaft 4, realizing the smooth rotation of the barrel shaft 4. The barrel shaft 4 is made of non-magnetic material, so that the magnetic force of the first fixing ring 3 and the second fixing ring 7 is not easy to affect the normal rotation of the barrel shaft 4.

[0026] Furthermore, the torque calculation formula for the interaction between the first fixing ring 3 and the second fixing ring 7 is:

[0027]

[0028] Where T is the torque, e is the eccentricity between the first fixing ring 3 and the second fixing ring 7, R is the radius of the first fixing ring 3, r is the radius of the second fixing ring 7, N 外 is the number of the first magnetic cores 32 on the first fixing ring 3, B is the surface magnetic induction intensity of the first fixing ring 3, A is the effective area of the first magnetic cores 32 on the first fixing ring 3, d(θ)≈e cosθ+(R - r) is the dynamic gap between the first fixing ring 3 and the second fixing ring 7, μ 0 is the vacuum permeability, θ is the angular position of the magnetic pole of the first fixing ring 3 relative to the axis of the rotating shaft. Through the above torque calculation formula, the unbalanced force is calculated according to the torque delivered to the barrel shaft 4 by the driving member 8, and the required torques of the first fixing ring 3 and the second fixing ring 7 are deduced from the unbalanced force, so as to set the size of the first fixing ring 3 and the arrangement of the magnetic cores thereon according to the above formula.

[0029] Referring to Figure 2 , a driving member 8 is fixed at the bottom of the mounting base 1. Specifically, the driving member 8 is a servo motor. The outer shell of the servo motor is connected and fixed to the bottom block 12, and the driving shaft of the servo motor extends into the circular cavity 14 and is connected and fixed to the bottom end of the barrel shaft 4 through a coupling.

[0030] Referring to Figure 3, Further, a first annular groove is formed between the top cover 13 and the first boss 15 at the upper end of the circular cavity 14. A first sound insulation sealing ring 131 is embedded in the first annular groove. The first sound insulation sealing ring 131 abuts against the outer wall of the barrel shaft 4. A second annular groove is recessed on the bottom surface of the bottom block 12. A second sound insulation sealing ring 121 is embedded in the second annular groove. And when the outer shell of the servo motor is fixedly connected to the bottom block 12, it is in tight fit with the second sound insulation sealing ring 121. A third annular groove is recessed on the inner wall of the perforation of the circular end cover 42. A third sound insulation sealing ring 421 is embedded in the third annular groove. The third sound insulation sealing ring 421 abuts against the rotating shaft 6. Sound insulation and dust prevention are achieved through the first sound insulation sealing ring 131, the second sound insulation sealing ring 121 and the third sound insulation sealing ring 421, so that the noise is small when the equipment is running, and the dust is not easy to enter the circular cavity 14 and the circular groove 43 to dirty the deep groove bearing and affect the operation of the deep groove bearing.

[0031] Refer to Figures 1-3 , Further, a counterweight 9 is also fixed to the top end of the cylindrical body 41 by bolts. The design of the counterweight 9 is beneficial to reducing the imbalance when the barrel shaft 4 rotates, and further making the rotation of the barrel shaft 4 stable.

[0032] The implementation principle of a 3C product grinding device in this application is as follows: The mounting base 1 is formed by a body block 11, a bottom block 12 and a top cover 13 to form a split disassembly and assembly structure, which is convenient for installing the first deep groove bearing 2, the first fixing ring 3 and the barrel shaft 4. The barrel shaft 4 is formed by a cylindrical body 41 and a circular end cover 42 to form a split disassembly and assembly structure, which is convenient for installing the second deep groove bearing 5, the second fixing ring 7 and the rotating shaft 6. At the same time, in the structure of this application, the barrel shaft 4 is supported by the first deep groove bearing 2 so that the barrel shaft 4 is firmly fixed in the circular cavity 14 and the barrel shaft 4 can rotate stably in the circular cavity 14. The rotating shaft 6 is supported by the second deep groove bearing 5 so that the rotating shaft 6 is firmly fixed in the circular groove 43 provided on the barrel shaft 4 and can rotate stably in the circular groove 43. Since the center of the circular groove 43 and the barrel shaft 4 are not on the same straight line, the rotating shaft 6 is restricted to the center of the circular groove 43 by the first deep groove bearing 2. Therefore, when the barrel shaft 4 rotates around its own axis, it drives the rotating shaft 6 and the grinding head 61 connected to the rotating shaft 6 to perform eccentric rotation, so as to realize eccentric grinding of the product. Through the first magnetic cores 32 arranged around the center of the first fixing ring 3, and the magnetic poles of adjacent two first magnetic attractions are opposite, the direction of the magnetic field of the first fixing ring 3 is radially (i.e., pointing to the center of rotation) as a whole. Through the second magnetic cores 72 arranged around the center of the second fixing ring 7, and the magnetic poles of the second magnetic cores 72 are the same, the direction of the magnetic field of the second fixing ring 7 is diverging outwards (i.e., pointing to the second magnetic ring). Since the first fixing ring 3 is fixed by press-fitting into the circular cavity 14, and the second fixing ring 7 is press-fitted into the rotating shaft 6 through the inner hole, the centers of the first fixing ring 3 and the second fixing ring 7 are not on the same straight line. The second fixing ring 7 rotates eccentrically with the rotating shaft 6. Therefore, the second fixing ring 7 is subjected to a magnetic force opposite to the centrifugal force at the eccentric position, so as to offset the unbalanced force generated by the centrifugation of the rotating shaft 6 and the grinding head 61, achieve the purpose of reducing vibration, make the grinding uniform, and is beneficial to improving the service life of the equipment.

[0033] Although the embodiments of the present application have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principle and spirit of the present application. The scope of the present application is defined by the appended claims and their equivalents.

Claims

1. A 3C product polishing device, characterized in that: The invention comprises a mounting seat, wherein the mounting seat is provided with a circular cavity penetrating the mounting seat, a first deep groove bearing and a first fixing ring are embedded and fixed in the circular cavity, a cylindrical shaft is inserted into the inner ring hole of the first deep groove bearing through interference fit, and the cylindrical shaft is inserted into the inner hole of the first fixing ring, a plurality of first magnetic cores uniformly arranged around the center of the circle are fixed on the first fixing ring, and the magnetic poles of two adjacent first magnetic cores are opposite, the cylindrical shaft is provided with a circular groove, and the axis center of the cylindrical shaft is not on the same straight line as the center of the circular groove, a second deep groove bearing is embedded and fixed in the circular groove, and the inner ring hole of the second deep groove bearing is provided with a cylindrical shaft. A rotating shaft is inserted into the ring hole with an interference fit, the rotating shaft passes through the top of the mounting seat and a grinding head is connected to the top thereof, a second fixing ring is also inserted into the outer wall of the rotating shaft with an interference fit, the second fixing ring is aligned with the first fixing ring, and a plurality of second magnetic cores evenly arranged around the center of the circle are fixed on the second fixing ring, the magnetic poles of the plurality of second magnetic cores are the same, there is a gap between the first fixing ring and the second fixing ring and the cylindrical shaft, the cylindrical shaft is made of non-magnetic material, a driving member is also fixed to the bottom of the mounting seat, the driving member is connected to the cylindrical shaft to drive the cylindrical shaft to rotate around its own center.

2. A 3C product polishing device according to claim 1, characterized in that: The inner hole side wall of the first fixing ring is recessed with a plurality of first square grooves evenly arranged around the center thereof, the first magnetic core is a square matching the length and width of the first square groove and is embedded in the first square groove for fixing, and the outer hole side wall of the second fixing ring is recessed with a plurality of second square grooves evenly arranged around the center thereof, the second magnetic core is a square matching the length and width of the second square groove and is embedded in the second square groove for fixing.

3. A 3C product polishing device according to claim 2, characterized in that: The first fixing ring is provided with first limiting protrusions on both side walls relative to the first square groove, and the distance from the first limiting protrusion to the bottom surface of the first square groove matches the thickness of the first magnetic core. The second fixing ring is provided with second limiting protrusions on both side walls relative to the second square groove, and the distance from the second limiting protrusion to the top surface of the second square groove matches the thickness of the first magnetic core.

4. A 3C product polishing device according to claim 1, characterized in that: The number of the first deep groove bearings is at least two, and the outer rings of the two first deep groove bearings clamp the first fixing ring up and down to fix the first fixing ring.

5. A 3C product polishing device according to claim 4, characterized in that: The mounting seat is formed with first bosses arranged up and down in the circular cavity, the first deep groove bearing and the first fixing ring are located between two of the first bosses, and the upper first boss presses against the top surface of the outer ring of the first deep groove bearing at the uppermost end of the circular cavity, and the other first boss presses against the bottom surface of the outer ring of the first deep groove bearing at the lowermost end of the circular cavity.

6. A 3C product polishing device according to claim 1, characterized in that: The number of the second deep groove bearings is at least two, and the inner rings of the two second deep groove bearings clamp the second fixing ring up and down to fix the second fixing ring.

7. A 3C product polishing device according to claim 6, characterized in that: The cylindrical shaft is provided with second bosses at both upper and lower ends in the circular groove, the second deep groove bearing and the second fixing ring are located between the two second bosses, and the second boss at the top is pressed against the top surface of the outer ring of the second deep groove bearing at the uppermost end in the circular groove, and the other second boss is pressed against the bottom surface of the outer ring of the second deep groove bearing at the lowermost end of the circular groove.

8. The 3C product polishing device according to claim 1, characterized in that: The mounting seat is formed with a first annular groove at the top of the circular cavity and a first sound insulation sealing ring is embedded in the annular groove, the first sound insulation sealing ring abuts against the outer wall of the cylinder shaft, and the mounting seat is also formed with a second annular groove at the bottom surface and a second sound insulation sealing ring is embedded in the second annular groove, and the driving member is tightly fitted with the second sound insulation sealing ring when fixed to the bottom of the mounting seat.

9. A 3C product polishing device according to claim 1, characterized in that: The driving member is a servo motor, and the servo motor is connected to the barrel shaft through a coupling.

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