CN114700866B

CN114700866B - Grinding and polishing device

Info

Publication number: CN114700866B
Application number: CN202210295762.3A
Authority: CN
Inventors: 王鑫龙; 丁礼俊; 闵玉龙; 吴小锋; 吴厚勇; 龙学武; 邓力丰; 周彦吕; 李均熠
Original assignee: China General Nuclear Power Corp; CGN Power Co Ltd; China Nuclear Power Operation Co Ltd
Current assignee: China General Nuclear Power Corp; CGN Power Co Ltd; China Nuclear Power Operation Co Ltd
Priority date: 2022-03-24
Filing date: 2022-03-24
Publication date: 2023-06-13
Anticipated expiration: 2042-03-24
Also published as: CN114700866A

Abstract

The application relates to a burnishing and polishing device, include: a shell: the transmission assembly is arranged on the shell and sleeved on the rod piece; the driving piece is connected with the transmission assembly and used for driving the transmission assembly to rotate around the rod piece; the clamping assembly is sleeved on the rod piece; the transmission assembly is connected with the clamping assembly and used for driving the clamping assembly to rotate along the circumferential direction. The application provides an above-mentioned scheme is through placing the abrasive paper at clamping assembly's inboard back fixed integral device, and at this moment, abrasive paper and the surface contact of member, then drive assembly through the driving piece and rotate, drive assembly drives clamping assembly and rotates to just can polish the member surface through abrasive paper. The whole device is high in automation degree, compared with the traditional manual polishing, the working efficiency is obviously improved, the polishing quality is improved, the valve is smooth to act, and the packing leakage possibility is reduced.

Description

Grinding and polishing device

Technical Field

The application relates to the technical field of nuclear power valves, in particular to a grinding and polishing device.

Background

The valve is an important component device of the power station, each unit has thousands of valves, and the static machine has the disassembly work of hundreds of valves in each overhaul. The cleaning and inspection of valve parts after disassembly of the valve is a very important task, and the cleaning and inspection of the rod is of great importance. The rod piece is taken as an important component of the valve, and can be continuously used after being carefully polished, cleaned and inspected to be qualified every time of disassembly.

In order to prevent medium leakage, packing can be arranged between the rod piece and the valve cover to play a sealing role, and the rod piece and the packing can generate relative friction when the valve acts. During long-term operation of the valve, oxides and scratches may be generated on the surface of the rod, thereby affecting the normal operation of the valve and causing the medium to be exposed. Therefore, each disassembly requires polishing and cleaning of the rod sealing section. In order to prevent the sealing performance from being influenced by longitudinal grinding marks generated during grinding, the rod piece needs to be axially ground during grinding, and even grinding in the circumferential direction needs to be ensured during grinding so as to prevent the rod piece from deforming to influence the sealing performance.

At present, when a rod piece is cleaned, two people are matched, one person holds the strip sand paper to pull the strip sand paper back and forth, and the other person holds the rod piece and slowly rotates, so that the rod piece with a medium size can be qualified only after being polished for about half an hour, and the rod piece with a large size is harder to polish.

Disclosure of Invention

Based on this, it is necessary to provide a polishing device for solving the problem of low polishing efficiency of the existing rod polishing device.

The application provides a burnishing and polishing device, include:

a shell:

the transmission assembly is arranged on the shell and sleeved on the rod piece;

the driving piece is connected with the transmission assembly and used for driving the transmission assembly to rotate around the rod piece;

the clamping assembly is sleeved on the rod piece; the transmission assembly is connected with the clamping assembly and used for driving the clamping assembly to rotate along the circumferential direction.

In one embodiment, the transmission assembly includes a first gear and a second gear; the first gear and the second gear are arranged on the shell, the first gear is meshed with the second gear, an output shaft of the driving piece is connected with the first gear, and the second gear is sleeved on the rod piece; the second gear is connected with the clamping assembly.

In one embodiment, the clamping assembly comprises a fixing ring, a clamping claw and a locking ring, the clamping claw is sleeved on the rod piece, the fixing ring is sleeved on the outer side of the clamping claw, one end, facing the transmission assembly, of the fixing ring is connected with the transmission assembly, and the locking ring is sleeved on the fixing ring and used for pushing the clamping claw radially inwards.

In one embodiment, an external thread section is circumferentially arranged on the outer side wall of the locking ring facing one end of the locking ring, an internal thread section is circumferentially arranged on the inner side wall of the locking ring facing one end of the locking ring, and the internal thread section is matched with the external thread section after the locking ring is sleeved on the locking ring.

In one embodiment, an abutting portion is arranged on the inner wall of the through hole of the locking ring, a first inclined portion is arranged at one end, far away from the transmission assembly, of the clamping claw in the circumferential direction, and the abutting portion is in sliding fit with the first inclined portion.

In one embodiment, the clamping claw comprises a plurality of clamping claws, and the clamping claws are arranged between the fixed ring and the rod piece after being surrounded into a circular ring; a plurality of protrusions are uniformly distributed on the inner wall of the fixing ring along the circumferential direction, each clamping jaw is positioned between two adjacent protrusions, and the protrusions are in sliding abutting connection with the outer side walls of the clamping jaws along the radial direction.

In one embodiment, the clamping assemblies are arranged on two sides of the transmission assembly; and one end, close to the transmission assembly, of the clamping claw is provided with an inclined plane guide part, and the inclined plane guide part is in sliding abutting connection with the transmission assembly.

In one embodiment, a side of each clamping jaw facing the fixing ring is provided with convex parts which are distributed at intervals along the circumferential direction, and concave shapes are formed among the convex parts.

In one embodiment, a clamping groove is formed in one end, facing the transmission assembly, of the fixing ring in the circumferential direction, and the transmission assembly is abutted to the inner side face of the clamping groove.

In one embodiment, the housing is provided with a first mounting groove and a second mounting groove, the first mounting groove is communicated with the second mounting groove, the inner diameter of the first mounting groove is smaller than the inner diameter of the second mounting groove, the first gear is arranged in the first mounting groove, and the second gear is arranged in the second mounting groove.

Above-mentioned burnishing and polishing device wraps up abrasive paper on the lateral wall of member, then fixes whole device, and at this moment, abrasive paper and the surface contact of member then drive assembly through the driving piece and rotate, and drive assembly drives clamping assembly and rotates to just can polish the member surface through abrasive paper. The whole device is high in automation degree, compared with the traditional manual polishing, the working efficiency is obviously improved, the polishing quality is improved, the valve is smooth to act, and the packing leakage possibility is reduced.

Drawings

FIG. 1 is a schematic structural view of a lapping and polishing apparatus according to an embodiment of the present disclosure;

FIG. 2 is a schematic view of the sanding polishing device of FIG. 1 after clamping;

FIG. 3 is a schematic view of a housing in the sanding polishing device of FIG. 1;

FIG. 4 is a schematic view of a retaining ring in the sanding polishing device of FIG. 1;

FIG. 5 is a schematic view of the structure of the clamping jaw in the sanding polishing device of FIG. 1;

FIG. 6 is another schematic view of the clamping jaw of the sanding polishing device of FIG. 1;

fig. 7 is a schematic view of a locking ring in the sanding polishing device of fig. 1.

The figures are labeled as follows:

10. a housing; 101. a first mounting groove; 102. a second mounting groove; 20. a first gear; 30. a second gear; 40. a driving member; 50. a fixing ring; 501. an external thread section; 502. a protrusion; 503. a clamping groove; 60. clamping claws; 601. a first jaw; 6011. a second inclined portion; 602. a second jaw; 6021. a first projection; 60211. a third inclined portion; 603. a third jaw; 6031. a second projection; 60311. a fourth inclined portion; 70. a locking ring; 701. an internal thread segment; 702. a through hole; 7021. and an abutting portion.

Detailed Description

In order to make the above objects, features and advantages of the present application more comprehensible, embodiments accompanied with figures are described in detail below. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application. This application is, however, susceptible of embodiment in many other forms than those described herein and similar modifications can be made by those skilled in the art without departing from the spirit of the application, and therefore the application is not to be limited to the specific embodiments disclosed below.

In the description of the present application, it should be understood that the terms "center," "longitudinal," "transverse," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," etc. indicate orientations or positional relationships based on the orientation or positional relationships shown in the drawings, are merely for convenience in describing the present application and simplifying the description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be configured and operated in a particular orientation, and therefore should not be construed as limiting the present application.

Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In the description of the present application, the meaning of "plurality" is at least two, such as two, three, etc., unless explicitly defined otherwise.

In this application, unless specifically stated and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; either directly or indirectly, through intermediaries, or both, may be in communication with each other or in interaction with each other, unless expressly defined otherwise. The specific meaning of the terms in this application will be understood by those of ordinary skill in the art as the case may be.

In this application, unless expressly stated or limited otherwise, a first feature "up" or "down" a second feature may be the first and second features in direct contact, or the first and second features in indirect contact via an intervening medium. Moreover, a first feature being "above," "over" and "on" a second feature may be a first feature being directly above or obliquely above the second feature, or simply indicating that the first feature is level higher than the second feature. The first feature being "under", "below" and "beneath" the second feature may be the first feature being directly under or obliquely below the second feature, or simply indicating that the first feature is less level than the second feature.

It will be understood that when an element is referred to as being "fixed" or "disposed" on another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and the like are used herein for illustrative purposes only and are not meant to be the only embodiment.

As shown in fig. 1, in an embodiment of the present application, there is provided a lapping and polishing apparatus, including: the shell 10, drive assembly, driving piece 40 and clamping assembly, wherein, drive assembly sets up on shell 10, and drive assembly cover establishes on member 11, and driving piece 40 is connected with drive assembly, and driving piece 40 is used for driving drive assembly and moves around member 11, and clamping assembly cover establishes on member 11, and drive assembly is connected with clamping assembly for drive clamping assembly along the circumference rotation of member 11. The rod 11 may be any long rod-like structure requiring sanding, such as a valve stem; either a solid rod or a hollow rod.

By adopting the technical scheme, firstly, the sand paper is wrapped on the outer side wall of the rod piece 11, then the whole device is fixed, at the moment, the sand paper is in contact with the surface of the rod piece 11, then the driving component is driven to rotate by the driving piece 40, and the driving component drives the clamping component to rotate, so that the surface of the rod piece 11 can be polished by the sand paper. The whole device is high in automation degree, compared with the traditional manual polishing, the working efficiency is obviously improved, the polishing quality is improved, the valve is smooth to act, and the packing leakage possibility is reduced.

In some embodiments, as shown in fig. 1, the transmission assembly in the present application includes a first gear 20 and a second gear 30, the clamping assembly includes a fixed ring 50, a clamping claw 60, and a locking ring 70, where the first gear 20 and the second gear 30 are disposed on the housing 10, the first gear 20 and the second gear 30 are meshed, an output shaft of the driving member 40 is connected to the first gear 20, and the second gear 30 is sleeved on the rod 11; meanwhile, the clamping claw 60 is sleeved on the rod piece 11, one end of the clamping claw 60, which faces the second gear 30, is abutted against the second gear 30, the fixing ring 50 is sleeved on the outer side of the clamping claw 60, one end of the fixing ring 50, which faces the second gear 30, is connected with the second gear 30, and the locking ring 70 is sleeved on the fixing ring 50 and is used for pushing the clamping claw 60 radially inwards.

Specifically, as shown in fig. 3, a first mounting groove 101 and a second mounting groove 102 are provided on a housing 10 in the present application, wherein the first mounting groove 101 and the second mounting groove 102 are communicated, and an inner diameter of the first mounting groove 101 is smaller than an inner diameter of the second mounting groove 102, a first gear 20 is provided in the first mounting groove 101, an outer diameter of the first gear 20 is adapted to an inner diameter of the first mounting groove 101, a second gear 30 is provided in the second mounting groove 102, and the second gear 30 is adapted to an inner diameter of the second mounting groove 102. When the abrasive paper polishing machine is used, the abrasive paper is placed between the clamping claw 60 and the rod piece 11, the driving piece 40 drives the first gear 20 to rotate, the first gear 20 drives the second gear 30 to rotate, the second gear 30 drives the clamping claw 60 to rotate, and the clamping claw 60 drives the abrasive paper to polish the surface of the rod piece 11. The inner diameter of the first mounting groove 101 being smaller than the inner diameter of the second mounting groove 102 may make the rotation speed of the second gear 30 smaller than the rotation speed of the first gear 20 to prevent the excessive speed at the time of grinding. Of course, without limitation, in other embodiments, the rotational speed of the second gear 30 may have other relationships with the rotational speed of the first gear 20 depending on the sanding requirements or the output speed of the driving member 40.

The driving member 40 is a motor, an electric wrench, an electric drill or the like, and in order to facilitate connection between the driving member 40 and the first gear 20, a quick connector is mounted on the first gear 20.

It should be noted that the structure of the transmission assembly in the embodiment of the present application is merely an example, and in other alternatives, other structures, such as three gears meshed with each other, may be used. The specific connection structure of the driving assembly is not particularly limited in this application, as long as the above structure can achieve the object of this application.

In some embodiments, as shown in fig. 1 in combination with fig. 7, the locking ring 70 of the present application is attached to the securing ring 50. Specifically, as shown in fig. 1 and 7, the present application is provided with an external thread segment 501 on the outer sidewall of the locking ring 50 facing one end of the locking ring 70 in the circumferential direction, and at the same time, is provided with an internal thread segment 701 on the inner sidewall of the locking ring 70 facing one end of the locking ring 50 in the circumferential direction, and after the locking ring 70 is sleeved on the locking ring 50, the external thread segment 501 on the locking ring 50 rotates into the internal thread segment 701 on the locking ring 70.

Further, as shown in fig. 7 and in combination with fig. 1 and 2, the present application is provided with an abutment portion 7021 on an inner wall of the through hole 702 at an end of the locking ring 70 far from the fixed ring 50, and at the same time, a first inclined portion is provided on an outer sidewall of the clamping jaw 60 far from the end of the second gear 30 along a circumferential direction, wherein the abutment portion 7021 is slidingly engaged with the first inclined portion; after the internal thread segment 701 is engaged with the external thread segment 501, the abutment 7021 abuts against the first inclined portion, and the abutment 7021 can slide along the surface of the first inclined portion, thereby pushing the clamping jaw 60 radially inward. In this embodiment, as shown in fig. 7, the abutment portion 7021 is specifically a slope portion that slides in cooperation with the surface of the first slope portion on the clamping jaw 60.

When the clamping jaw 60 is tightened, as shown in fig. 1, the locking ring 70 is first screwed onto the outer sidewall of the end of the fixing ring 50 away from the second gear 30, at this time, the male screw section 501 of the fixing ring 50 is rotated into the female screw section 701 of the locking ring 70, and then the locking ring 70 is rotated, as shown in fig. 1 in combination with fig. 2, at this time, the locking ring 70 is moved toward the side close to the second gear 30, and since the abutment 7021 of the locking ring 70 is engaged with the first inclined portion of the end of the clamping jaw 60 away from the second gear 30, at this time, the abutment 7021 presses the first inclined portion of the end of the clamping jaw 60 away from the second gear 30 inward, thereby locking the clamping jaw 60 to the rod 11.

In some embodiments, as shown in fig. 5 (a) and fig. 6 (a 1), the clamping jaw 60 in the present application includes a plurality of first clamping jaws 601, and the plurality of first clamping jaws 601 are disposed between the fixing ring 50 and the rod 11 after being surrounded into a ring; wherein, each first clamping jaw 601 is provided with a second inclined part 6011 along two ends of the rod 11, the second inclined part 6011 on one end of the first clamping jaw 601 is abutted with the inner side wall of the second gear 30, and is used for providing guiding function for the clamping jaw 60 when the clamping jaw 60 moves inwards, so that the clamping jaw 60 moves inwards uniformly and tightens the rod 11 as a whole, and the second inclined part 6011 on the other end of the first clamping jaw 601 is matched with the abutting part 7021; after the female screw section 701 and the male screw section 501 are connected in a mating manner, the abutment portion 7021 abuts against the second inclined portion 6011. In other alternative embodiments, there may be only one second inclined portion 6011 on the first jaw 601 for mating with the abutment 7021.

When the locking ring 70 is rotated after each component is mounted, as shown in fig. 1 and 2, at this time, the locking ring 70 moves toward the side close to the second gear 30, and since the abutment portion 7021 on the locking ring 70 is engaged with the second inclined portion 6011, that is, the abutment portion 7021 is engaged with the second inclined portion 6011, an inward clamping force is applied to the second inclined portion 6011 when the abutment portion 7021 moves toward the side close to the second gear 30, so that the clamping jaw 60 can be securely locked to the lever 11.

In this embodiment, the first jaw 601 can be adapted to the sanding of the rod 11 over a range of diameters by adjusting the degree of rotation of the locking ring 70 relative to the rod 11.

In some embodiments, to further facilitate polishing rod pieces 11 of different diameter ranges, as shown in fig. 5 (b) and fig. 6 (b 1), the clamping jaw 60 in the present application may include a plurality of second clamping jaws 602, where the plurality of second clamping jaws 602 are disposed between the fixing ring 50 and the rod piece 11 after being surrounded into a ring, and an inner diameter of the plurality of second clamping jaws 602 surrounding into a ring is smaller than an inner diameter of the plurality of first clamping jaws 601 surrounding into a ring (or, a radial thickness of the second clamping jaws 602 is greater than a radial thickness of the first clamping jaws 601), so that the second clamping jaws 602 can be adapted to rod pieces 11 of another diameter range. As shown in fig. 5, the side of each second clamping jaw 602 facing the fixing ring 50 is provided with first protruding portions 6021 which are distributed at intervals along the circumferential direction, and the first protruding portions 6021 are relatively recessed, so that the weight of the whole second clamping jaw 602 can be reduced on the basis of ensuring the radial thickness of the second clamping jaw 602.

The first protruding portion 6021 is provided with a third inclined portion 60211 at both ends, after the second clamping jaw 602 is mounted between the fixing ring 50 and the rod 11, the third inclined portion 60211 at one end of the first protruding portion 6021 abuts against the inner side wall of the second gear 30, the third inclined portion 60211 at the other end of the first protruding portion 6021 is matched with the abutting portion 7021, and the inner side wall of the fixing ring 50 abuts against the first protruding portion 6021.

When the locking ring 70 is rotated after the components are assembled, as shown in fig. 1 and 2, at this time, the locking ring 70 moves toward the side close to the second gear 30, and since the abutment portion 7021 of the locking ring 70 is engaged with the third inclined portion 60211, that is, the abutment portion 7021 and the third inclined portion 60211 are engaged, an inward clamping force is applied to the third inclined portion 60211 when the abutment portion 7021 moves toward the side close to the second gear 30, thereby securing the clamping jaw 60 to the lever 11.

Meanwhile, as the inner diameter of the circular ring formed by the plurality of second clamping jaws 602 is smaller than the inner diameter of the circular ring formed by the plurality of first clamping jaws 601, when the rod piece with the other diameter is sleeved with the circular ring formed by the plurality of second clamping jaws 602, and polishing of rod pieces with different diameters can be achieved.

Further, as shown in fig. 5 (c) and fig. 6 (c 1), the clamping jaw 60 in the present application may include a plurality of third clamping jaws 603, where the plurality of third clamping jaws 603 are disposed between the fixed ring 50 and the rod 11 after enclosing a ring, and an inner diameter of the ring enclosed by the plurality of third clamping jaws 603 is smaller than an inner diameter of the ring enclosed by the plurality of second clamping jaws 602; specifically, as shown in fig. 5, the side of each third clamping jaw 603 facing the fixed ring 50 is provided with second protruding portions 6031 distributed at intervals in the circumferential direction, the length of the second protruding portions 6031 in the radial direction of the fixed ring 50 is larger than the length of the first protruding portions 6021 in the radial direction of the fixed ring 50, and similarly, the radial thickness of the third clamping jaw 603 is larger than the radial thickness of the second clamping jaw 602. The second protruding portion 6031 is provided with a fourth inclined portion 60311 at both ends, after the third clamping jaw 603 is mounted between the fixing ring 50 and the rod 11, the fourth inclined portion 60311 at one end of the second protruding portion 6031 abuts against the inner side wall of the second gear 30, the fourth inclined portion 60311 at the other end of the second protruding portion 6031 is matched with the abutting portion 7021, and the inner side wall of the fixing ring 50 abuts against the second protruding portion 6031.

When the locking ring 70 is rotated after the components are assembled, as shown in fig. 1 and 2, at this time, the locking ring 70 moves toward the side close to the second gear 30, and since the abutting portion 7021 of the locking ring 70 is engaged with the fourth inclined portion 60311, that is, the abutting portion 7021 and the fourth inclined portion 60311 are engaged, an inward clamping force is applied to the fourth inclined portion 60311 when the abutting portion 7021 moves toward the side close to the second gear 30, thereby securing the clamping jaw 60 to the lever 11.

Meanwhile, as the inner diameter of the ring surrounded by the third clamping jaws 603 is smaller than the inner diameter of the ring surrounded by the second clamping jaws 602, when the rod piece polishing machine is used, the ring surrounded by the third clamping jaws 603 is sleeved on the rod pieces with other diameters, and therefore polishing of rod pieces with various diameters can be achieved. In other embodiments, other sizes of clamping jaws may be used to clamp the rod members with various diameters, which is not described herein.

In some embodiments, as shown in fig. 4, a plurality of protrusions 502 are uniformly distributed on the inner wall of the fixing ring 50 along the axial direction, and a groove is formed between two adjacent protrusions 502. When the fixing ring 50 is sleeved on the clamping jaw 60, each clamping jaw (the first clamping jaw 601, the second clamping jaw 602 and the third clamping jaw 603) is positioned between two adjacent bulges 502, and the bulges 502 are in sliding abutting contact with the outer side walls of the corresponding clamping jaw 60 along the radial direction. The protrusions 502 may enable the clamping jaws to slide along the outer side walls thereof in the radial direction, and enable the fixing ring 50 to firmly fasten the clamping jaw 60, so as to avoid relative circumferential movement of the clamping jaw 60.

In some embodiments, for convenience in fixing the fixing ring 50 to the outer side wall of the second gear 30, as shown in fig. 2, a clamping groove 503 is circumferentially provided on the inner side wall of the fixing ring 50 facing one end of the second gear 30, and after the fixing ring 50 is mounted on the second gear 30, a protruding structure such as teeth on the outer side wall of the second gear 30 can abut against the inner side surface of the clamping groove 503, so that the fixing ring 50 and the second gear 30 are fixedly connected together. Of course, not limited thereto, in other embodiments, there may be other fixing connection manners between the fixing ring 50 and the second gear 30, and only the fixing ring and the second gear may be kept circumferentially stationary.

Referring to fig. 1 and 2, in this embodiment, the rod 11 is generally vertically disposed when polishing, and a set of clamping assemblies are respectively disposed on the upper side and the lower side of the rod, and the upper and lower sets of clamping assemblies are symmetrically disposed, which can increase the polishing area when polishing once. When one grinding is completed, the whole grinding and polishing device can be manually moved to another position along the axial direction by adjusting the position of the locking ring 70 and loosening the clamping claw 60, and then the grinding and polishing device can be continuously used for adjusting the locking ring 70 and enabling the clamping claw 60 to clamp the rod piece 11.

The technical features of the above-described embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above-described embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.

The above examples merely represent a few embodiments of the present application, which are described in more detail and are not to be construed as limiting the scope of the invention. It should be noted that it would be apparent to those skilled in the art that various modifications and improvements could be made without departing from the spirit of the present application, which would be within the scope of the present application. Accordingly, the scope of protection of the present application is to be determined by the claims appended hereto.

Claims

1. A sanding polishing device, comprising:

housing (10):

the transmission assembly comprises a first gear (20) and a second gear (30), the first gear (20) and the second gear (30) are arranged on the shell (10), and the second gear (30) is sleeved on the rod piece (11);

the driving piece (40) is connected with the transmission assembly and used for driving the transmission assembly to rotate around the rod piece (11);

the clamping assembly is sleeved on the rod piece (11); the transmission assembly is connected with the clamping assembly and used for driving the clamping assembly to rotate along the circumferential direction;

the clamping assembly comprises a fixed ring (50), a clamping claw (60) and a locking ring (70), wherein the clamping claw (60) is sleeved on the rod piece (11), one end, close to the second gear (30), of the clamping claw (60) is provided with an inclined surface guide part, and the inclined surface guide part is in sliding abutting connection with the second gear (30); the fixed ring (50) is sleeved on the outer side of the clamping claw (60), one end, facing the second gear (30), of the fixed ring (50) is connected with the second gear (30), and the locking ring (70) is sleeved on the fixed ring (50) and used for pushing the clamping claw (60) radially inwards.

2. The lapping device of claim 1, wherein,

and the first gear (20) is meshed with the second gear (30), and an output shaft of the driving piece (40) is connected with the first gear (20).

3. The grinding and polishing device according to claim 1, wherein an outer thread section (501) is circumferentially arranged on an outer side wall of the fixing ring (50) facing one end of the locking ring (70), an inner thread section (701) is circumferentially arranged on an inner side wall of the locking ring (70) facing one end of the fixing ring (50), and the inner thread section (701) is matched with the outer thread section (501) after the locking ring (70) is sleeved on the fixing ring (50).

4. A sanding polishing device according to claim 3, characterized in that the inner wall of the through hole (702) of the locking ring (70) is provided with an abutment (7021), and the end of the clamping jaw (60) remote from the transmission assembly is provided with a first inclined portion in the circumferential direction, and the abutment is in sliding fit with the first inclined portion.

5. A grinding and polishing device according to claim 3, wherein the clamping jaw (60) comprises a plurality of clamping jaws, which are arranged between the fixing ring (50) and the rod (11) after being surrounded into a ring; a plurality of protrusions (502) are uniformly distributed on the inner wall of the fixing ring (50) along the circumferential direction, each clamping jaw is located between two adjacent protrusions (502), and the protrusions (502) are in sliding abutting connection with the outer side walls of the clamping claws (60) along the radial direction.

6. The lapping device of claim 4, wherein the clamping assemblies are provided on both sides of the drive assembly.

7. The grinding and polishing apparatus as set forth in claim 5, wherein each of said clamping jaws is provided with protrusions circumferentially spaced apart on a side facing said fixed ring (50), said protrusions being concave therebetween.

8. A sanding polishing device according to claim 3, characterized in that the securing ring (50) is provided with a clamping groove (503) in the circumferential direction towards one end of the transmission assembly, which abuts against the inner side of the clamping groove (503).

9. The grinding and polishing device according to claim 1, wherein a first mounting groove (101) and a second mounting groove (102) are provided on the housing (10), the first mounting groove (101) and the second mounting groove (102) are communicated, an inner diameter of the first mounting groove (101) is smaller than an inner diameter of the second mounting groove (102), the first gear (20) is provided in the first mounting groove (101), and the second gear (30) is provided in the second mounting groove (102).