Grinding device

Abstract

The utility model discloses a grinding device which comprises a mounting shell, a grinding assembly and a damping assembly, and a mounting cavity is formed in the mounting shell; the grinding assembly comprises a transmission part and a clamping body, the transmission part and the clamping body are both mounted in the mounting cavity, a clamping hole is formed in the clamping body, the length of the clamping hole extends in the axial direction of the clamping body, and the clamping hole is located in the side, away from the transmission part, of the clamping body; the damping assembly is installed in the installation cavity and connected with the clamping body, and the damping assembly is located on the side, in the radial direction of the clamping hole, of the clamping hole. According to the utility model, the problem that large vibration is easy to generate in the process of driving the grinding head to rotate at a high speed by a power handle is solved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of medical devices, in particular to a grinding device. BACKGROUND

[0002] A medical power handle is a device for grinding, planing, boring and other operations on a surgical site (such as a spine, a bone, etc.) by clamping different grinding heads. The power handle usually includes a clamping component for clamping the grinding head and a power component installed in the inner cavity of the handle, etc. The power component can drive the grinding head clamped by the clamping component to rotate at high speed. However, during the process of driving the grinding head to rotate at high speed, the power handle is prone to generate large vibration, which not only causes inaccurate grinding operation, but also accelerates the wear between the internal components of the handle, so that the handle is prone to failure and the maintenance frequency increases. CONTENT OF THE UTILITY MODEL

[0003] The main purpose of the present application is to provide a grinding device to solve the problem of large vibration generated during the process of driving the grinding head to rotate at high speed in the power handle in the background art.

[0004] According to one aspect of the present application, a grinding device is provided, comprising:

[0005] A mounting shell is provided with a mounting cavity inside;

[0006] A grinding assembly includes a transmission component and a clamping body, both of which are installed in the mounting cavity. The clamping body is provided with a clamping hole, the length of which extends along the axial direction of the clamping body and is located on the side of the clamping body away from the transmission component;

[0007] A damping assembly is installed in the mounting cavity and connected with the clamping body, and the damping assembly is located on the side of the clamping hole along the radial direction of the damping assembly.

[0008] Further, the clamping body includes a connecting shaft and a connecting sleeve. One end of the connecting shaft is connected with the transmission component, and the connecting sleeve is connected with the end of the connecting shaft away from the transmission component. Along the axial direction of the connecting shaft, the clamping hole is provided in the connecting sleeve. The damping assembly includes:

[0009] A limiting component is provided on the connecting sleeve and surrounds the outer peripheral surface of the connecting sleeve to form a limiting space;

[0010] A compression spring is sleeved on the connecting sleeve and located in the limiting space. Along the axial direction of the compression spring, the opposite ends of the compression spring respectively abut against the inner wall surfaces on the opposite sides of the limiting space.

[0011] Further, the limiting component comprises:

[0012] a first fixing ring, the first fixing ring is sleeved on the connecting sleeve, a first stop structure is arranged between the first fixing ring and the connecting sleeve, the first stop structure stops the first fixing ring on the side of the connecting sleeve close to the connecting shaft;

[0013] a second fixing ring, the second fixing ring is sleeved on the connecting sleeve, a second stop structure is arranged between the second fixing ring and the connecting sleeve, the second stop structure stops the second fixing ring on the side of the first fixing ring away from the connecting shaft, and the second fixing ring and the first fixing ring have an installation gap therebetween, and the compression spring is located in the installation gap and abuts against the first fixing ring and the second fixing ring respectively.

[0014] Further, the side close to each other of the first fixing ring and the second fixing ring is provided with a first groove, the first groove extends along the circumference of the connecting sleeve, and the spiral turns of the end of the compression spring are adapted to the first groove and embedded in the first groove.

[0015] Further, the first stop structure comprises a second groove, the second groove is recessed on the surface of the connecting sleeve close to the connecting shaft, the second groove extends along the circumference of the connecting sleeve, and the side close to the connecting sleeve of the first fixing ring is at least partially embedded in the second groove along the radial direction of the connecting sleeve.

[0016] Further, along the radial direction of the connecting sleeve, the side wall close to the connecting shaft side of the second groove is higher than the side wall away from the connecting shaft side.

[0017] Further, the second stop structure comprises:

[0018] a third groove, the third groove is arranged on the inner wall surface of the installation housing, and the slot of the third groove faces the connecting sleeve;

[0019] a first bearing, the first bearing is sleeved on the connecting sleeve and abuts against the side of the second fixing ring away from the first fixing ring, and the first bearing is at least partially embedded in the third groove away from the outer side of the connecting sleeve.

[0020] Further, the installation cavity comprises a first installation hole and a second installation hole, and the installation housing comprises:

[0021] a main shell component, the first installation hole is arranged in the main shell component;

[0022] The first shell part comprises a connecting shell and a fixing member, the connecting shell is connected with the main shell part, the second mounting hole is arranged in the connecting shell and communicates with the first mounting hole, and a boss is arranged on the inner wall surface of the connecting shell away from the main shell part along the axial direction of the second mounting hole; the fixing member is connected with the inner wall surface of the connecting shell, and the fixing member is located on the side of the boss close to the main shell part and forms the third groove together with the boss.

[0023] The second shell part is connected with the connecting shell, and a connecting hole is arranged in the second shell part and communicates with the second mounting hole.

[0024] Further, the fixing member comprises:

[0025] A sleeve is arranged in the second mounting hole along the axial direction of the second mounting hole, and an avoiding hole is arranged in the sleeve and communicates with the second mounting hole; the sleeve is sleeved on the connecting sleeve through the avoiding hole, the outer peripheral surface of the sleeve is connected with the inner wall surface of the connecting shell along the radial direction of the avoiding hole, and the first fixing ring, the second fixing ring and the compression spring are located in the avoiding hole.

[0026] Further, a screwing structure is arranged between the sleeve and the inner wall surface of the connecting shell, and the screwing structure comprises:

[0027] An inner thread segment is arranged on the inner wall surface of the connecting shell and located on the side of the boss close to the main shell part;

[0028] An outer thread segment is arranged on the outer peripheral surface of the sleeve, and the thread of the outer thread segment is matched with the thread of the inner thread segment.

[0029] In this application, both the transmission component and the clamping body of the grinding device are installed within the mounting cavity of the mounting housing. The transmission component can be connected to a motor. A clamping hole is provided within the clamping body, extending axially along the clamping body and located on the side of the clamping body away from the transmission component. At least a portion of the shank of the grinding workpiece passes through the clamping hole to connect with the clamping body. The motor drives the transmission component to rotate the grinding workpiece connected to the clamping body for grinding operations. A vibration damping component is installed within the mounting cavity and connected to the clamping body, located on the radial side of the clamping hole. Therefore, the vibrational mechanical energy generated during the rotation of the grinding workpiece by the transmission component is absorbed by the vibration damping component, thereby reducing the vibration intensity transmitted to other components of the grinding device. This avoids significant wear between the mounting housing and the transmission component, between the transmission component and the clamping body, and between other components, improving the stability and reliability of the grinding device structure and extending its service life. At the same time, the vibration transmitted to the operator's hand will be reduced, avoiding increased hand fatigue and improving the operator's operational precision. It can also ensure that no unnecessary damage is caused to the surgical site (such as tissue tearing or uneven cutting surface), thereby improving the quality of the surgery. Attached Figure Description

[0030] The accompanying drawings, which are included to provide a further understanding of this application and form part of this application, illustrate exemplary embodiments and are used to explain this application, but do not constitute an undue limitation of this application. In the drawings:

[0031] Figure 1 This is a schematic diagram of the structure of a grinding device provided in an embodiment of the present invention;

[0032] Figure 2 for Figure 1 AA section view;

[0033] Figure 3 for Figure 2 Enlarged schematic diagram of part B in the middle;

[0034] Figure 4 This is a schematic diagram showing the connection between the connecting sleeve and the shock-absorbing assembly;

[0035] Figure 5 for Figure 4 A schematic diagram of its breakdown.

[0036] The above figures include the following reference numerals:

[0037] 10, mounting housing; 101, mounting cavity; 11, main housing part; 111, first mounting hole; 12, first housing part; 121, connecting housing; 1211, second mounting hole; 1212, boss; 122, sleeve; 1221, avoiding hole; 13, second housing part; 131, connecting hole; 20, grinding assembly; 21, transmission part; 211, connecting rod; 212, transmission shaft; 22, clamping body; 220, clamping hole; 221, connecting shaft; 222, connecting sleeve; 30, damping assembly; 31, limiting part; 311, first fixing ring; 312, second fixing ring; 313, first groove; 32, compression spring; 40, first stop structure; 41, second groove; 50, second stop structure; 51, third groove; 52, first bearing; 60, screwing structure; 61, inner threaded section; 62, outer threaded section; 70, grinding piece. DETAILED DESCRIPTION

[0038] It should be noted that the embodiments and features in the embodiments in the present application can be combined with each other without conflict. The present application will be described in detail below with reference to the drawings and in combination with the embodiments.

[0039] It should be noted that the terms used herein are only intended to describe specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, the singular form is intended to include the plural form, unless the context clearly indicates otherwise, and it should also be understood that, when the terms "comprise" and / or "include" are used in the specification, there is a presence of a feature, step, operation, device, component and / or a combination thereof.

[0040] Unless specifically stated otherwise, the relative arrangements of the components and steps illustrated in these embodiments and the numerical expressions and values set forth in the examples are not meant to limit the scope of the present application. It should be understood that the size of each part shown in the drawings is not necessarily to scale. Techniques, methods, and devices known to those of ordinary skill in the relevant art can not be discussed in detail, but should be considered as part of the present application. In all examples shown and discussed herein, any specific value should be interpreted as merely an example, and not as a limitation. Therefore, other examples of the exemplary embodiments can have different values. It should be noted that similar reference numbers and letters in the following drawings represent similar items, and therefore, once an item is defined in one drawing, it need not be further discussed in subsequent drawings.

[0041] To solve the problem that large vibration is easily generated in the process of high-speed rotation of the grinding head driven by the power handle, the first embodiment of the present application provides a grinding device, please see Figures 1 to 5The grinding device comprises a mounting shell 10, a grinding assembly 20 and a damping assembly 30, and the mounting shell 10 is provided with a mounting cavity 101.

[0042] As Figure 2 shown (in order to make Figure 2 the main structure clearer, Figure 2 the structure of the extension part on the right side of the fracture line is omitted), the grinding assembly 20 comprises a transmission part 21 and a clamping body 22, and both the transmission part 21 and the clamping body 22 are mounted in the mounting cavity 101. The clamping body 22 is provided with a clamping hole 220, and the length of the clamping hole 220 extends along the axial direction of the clamping body 22 and is located on the side of the clamping body 22 away from the transmission part 21. The clamping hole 220 is used for clamping the rod part of the grinding piece 70. The grinding device in the embodiment can be a straight machine type or a bending machine type. When it is a bending machine type, the transmission part 21 can comprise a connecting rod 211, a transmission shaft 212 and a gear transmission part 21. One end of the connecting rod 211 is connected with a connecting shaft 221. The transmission shaft 212 is connected with the clamping body 22 through the gear transmission part 21 and forms a certain angle with the clamping body 22, so as to form a bending machine type. The connecting rod 211 can be connected with the output shaft of the motor, so as to drive the transmission shaft 212 to rotate around the axial line of the connecting rod 211 under the driving of the motor. The gear transmission part 21 is used for transmitting the rotary kinetic energy of the transmission shaft 212 to the clamping body 22 to drive the clamping body 22 to rotate. When the grinding device is a straight machine type as Figure 1 shown, the gear transmission part 21 is not needed, and the transmission shaft 212 and the clamping body 22 are coaxially arranged and connected with each other.

[0043] The damping assembly 30 is mounted in the mounting cavity 101 and connected with the clamping body 22, and the damping assembly 30 is located on the side of the clamping hole 220 along the radial direction of the clamping hole 220. Thus, in the process of driving the grinding piece 70 to rotate by the clamping body 22, the vibration mechanical energy generated by the grinding piece 70 and the whole grinding device can be absorbed by the damping assembly 30, so as to reduce the vibration intensity of the whole grinding device and improve the operation precision. At the same time, since the damping assembly 30 is located on the side of the clamping hole 220 along the radial direction of the clamping hole 220, the path range of the vibration generated by the grinding piece 70 can be reduced. The vibration energy generated by the grinding piece 70 can be timely absorbed by the damping assembly 30, so as to improve the elimination efficiency of the vibration energy of the grinding piece 70, further improve the stability of the grinding piece 70 in the working process, and realize the improvement of the operation precision.

[0044] As can be seen, in the embodiment, the transmission component 21 and the clamping body 22 are both installed in the installation cavity 101 of the installation housing 10, and the transmission component 21 can be connected with the motor. The clamping body 22 is provided with a clamping hole 220, the length of the clamping hole 220 extends along the axial direction of the clamping body 22 and is located on the side of the clamping body 22 away from the transmission component 21, and the rod part of the grinding piece 70 is at least partially arranged in the clamping hole 220 to be connected with the clamping body 22, the motor drives the transmission component 21 to drive the grinding piece 70 connected with the clamping body 22 to rotate to perform the grinding operation. The damping assembly 30 is installed in the installation cavity 101 and connected with the clamping body 22, and the damping assembly 30 is located on the side of the clamping hole 220 along the radial direction of the clamping hole 220. Thus, the vibration mechanical energy generated in the process that the transmission component 21 drives the grinding piece 70 to rotate will be absorbed by the damping assembly 30, so as to reduce the vibration intensity of the vibration mechanical energy transmitted to other components of the grinding device, avoid the generation of large abrasion between the installation housing 10 and the transmission component 21, between the transmission component 21 and the clamping body 22, and between other components, improve the stability and reliability of the structure of the grinding device, and improve the service life. At the same time, since the vibration transmitted to the hands of the operator will also be reduced, the fatigue of the hands of the operator is avoided from being aggravated, so as to improve the operation accuracy of the operator, and it can be ensured that unnecessary damage (such as tissue tearing or uneven cutting surface) will not be caused to the surgical site, so as to improve the surgical quality.

[0045] As shown in Figure 2 , the clamping body 22 includes a connecting shaft 221 and a connecting sleeve 222, one end of the connecting shaft 221 is connected with the transmission component 21, and the connecting sleeve 222 is connected with the end of the connecting shaft 221 away from the transmission component 21. Along the axial direction of the connecting shaft 221, the clamping hole 220 is arranged in the connecting sleeve 222. The damping assembly 30 includes a limiting component 31 and a compression spring 32, the limiting component 31 is arranged on the connecting sleeve 222 and surrounds the outer peripheral surface of the connecting sleeve 222 to form a limiting space. The compression spring 32 is sleeved on the connecting sleeve 222 and located in the limiting space, and along the axial direction of the compression spring 32, the opposite ends of the compression spring 32 respectively abut against the inner wall surfaces on the opposite sides of the limiting space. In the process that the clamping body 22 drives the grinding piece 70 to rotate, when the grinding piece 70 and other components vibrate, the vibration mechanical energy is transmitted to the compression spring 32 in the limiting component 31, the compression spring 32 is elastically deformed (i.e. stretched or compressed), the deformation amount of the compression spring 32 is proportional to the force of the vibration mechanical energy applied on the compression spring 32, the larger the vibration is, the larger the deformation amount is, thus the vibration mechanical energy is absorbed, the vibration in the working process of the grinding device is reduced, and the stability of the grinding piece 70 is improved.

[0046] As shown in Figure 3 and Figure 5As shown, the limiting component 31 in the embodiment includes a first fixed ring 311 and a second fixed ring 312, and the first fixed ring 311 is sleeved on the connecting sleeve 222. A first stop structure 40 is arranged between the first fixed ring 311 and the connecting sleeve 222, and the first stop structure 40 stops the first fixed ring 311 on the side of the connecting sleeve 222 close to the connecting shaft 221. The second fixed ring 312 is sleeved on the connecting sleeve 222, and a second stop structure 50 is arranged between the second fixed ring 312 and the connecting sleeve 222. The second stop structure 50 stops the second fixed ring 312 on the side of the first fixed ring 311 away from the connecting shaft 221, and the second fixed ring 312 has a mounting gap with the first fixed ring 311, and the compression spring 32 is located in the mounting gap and abuts against the first fixed ring 311 and the second fixed ring 312 respectively, that is, the mounting gap is the above-mentioned limiting space. That is, the first fixed ring 311 and the second fixed ring 312 are sleeved on the connecting sleeve 222 in the embodiment, and the first fixed ring 311 and the second fixed ring 312 are stopped on the connecting sleeve 222 by the first stop structure 40 and the second stop structure 50 respectively, and a mounting gap capable of accommodating the compression spring 32 is reserved between the first fixed ring 311 and the second fixed ring 312, which is convenient to assemble. The first fixed ring 311 and the second fixed ring 312 are both circular ring structures, and both have through holes in the middle for the connecting sleeve 222 to pass through.

[0047] As shown, Figure 5 The side close to each other of the first fixed ring 311 and the second fixed ring 312 is provided with a first groove 313 extending along the circumference of the connecting sleeve 222, and the spiral turns at the end of the compression spring 32 are adapted to the first groove 313 and embedded in the first groove 313. Thus, the embodiment improves the stability and reliability of the compression spring 32 abutting between the first fixed ring 311 and the second fixed ring 312 by locating the spiral turns at both ends of the compression spring 32 in the first groove 313, without the need to increase additional compression components to stably and reliably abut the compression spring 32 between the first fixed ring 311 and the second fixed ring 312. The first groove 313 is convenient to process, and the assembly between the compression spring 32 and the corresponding fixed ring is more stable and reliable, and the first fixed ring 311 and the second fixed ring 312 can timely transmit the vibration mechanical energy to the compression spring 32, improving the reliability of the damping assembly 30.

[0048] As shown, Figure 5As shown, the first stop structure 40 includes a second groove 41 recessed on the surface of the connecting sleeve 222 near the connecting shaft 221, the second groove 41 extends along the circumference of the connecting sleeve 222 and along the radial direction of the connecting sleeve 222, and the first fixing ring 311 is at least partially embedded in the second groove 41 near the side of the connecting sleeve 222. Thus, by opening the second groove 41 on the surface of the connecting sleeve 222 and at least partially embedding the inner ring side of the first fixing ring 311 in the second groove 41, the first fixing ring 311 can be stopped at the position where the second groove 41 is located. The second groove 41 is easy to process, and the assembly between the first fixing ring 311 and the connecting sleeve 222 is convenient and reliable.

[0049] Along the radial direction of the connecting sleeve 222, the side wall near the connecting shaft 221 of the second groove 41 is higher than the side wall away from the connecting shaft 221. That is, the side wall near the connecting shaft 221 of the second groove 41 is higher, so that when the compression spring 32 exerts a larger abutting force on the first fixing ring 311, the first fixing ring 311 can still be stably stopped by the side wall near the connecting shaft 221 of the second groove 41, avoiding the first fixing ring 311 from being separated from the second groove 41 due to excessive force or large vibration, and improving the connection stability and strength between the first fixing ring 311 and the connecting sleeve 222.

[0050] In combination Figure 3 and Figure 5 It can be seen that the second stop structure 50 in the embodiment includes a third groove 51 and a first bearing 52. The third groove 51 is arranged on the inner wall surface of the mounting housing 10, and the slot of the third groove 51 faces the connecting sleeve 222. The first bearing 52 is sleeved on the connecting sleeve 222 and abuts against the side of the second fixing ring 312 away from the first fixing ring 311, and the outer side of the first bearing 52 away from the connecting sleeve 222 is at least partially embedded in the third groove 51. Thus, by fixing the first bearing 52 on the connecting sleeve 222 through the third groove 51, and abutting and stopping the second fixing ring 312 on the side of the first fixing ring 311 through the first bearing 52, the stability of the second fixing ring 312 can be improved, and the stability of the connecting sleeve 222 during rotation driven by the connecting shaft 221 can be improved through the first bearing 52, thereby improving the rotation stability of the grinding piece 70.

[0051] The mounting cavity 101 in the mounting shell 10 includes a first mounting hole 111 and a second mounting hole 1211. The mounting shell 10 includes a main shell component 11, a first shell component 12, and a second shell component 13. The first mounting hole 111 is arranged in the main shell component 11. The first shell component 12 includes a connecting shell 121 and a fixing member. The connecting shell 121 is connected with the main shell component 11, the second mounting hole 1211 is arranged in the connecting shell 121 and communicates with the first mounting hole 111, a boss 1212 is arranged on the inner wall surface of the second mounting hole 1211 away from the main shell component 11 along the axial direction of the second mounting hole 1211, the fixing member is connected with the inner wall surface of the connecting shell 121, and the fixing member is located on the side of the boss 1212 close to the main shell component 11 and forms a third groove 51 together with the boss 1212. Thus, the fixing member is arranged on the inner wall surface of the connecting shell 121 in the embodiment, and a certain gap is formed between the fixing member and the boss 1212, that is, the corresponding third groove 51 is obtained, the difficulty of arranging the third groove 51 is reduced, and the assembly is efficient and convenient. The second shell component 13 is connected with the connecting shell 121, and a connecting hole 131 is arranged in the second shell component 13 and communicates with the second mounting hole 1211. The connecting hole 131 is used for allowing the rod part of the grinding member 70 to pass into the second mounting hole 1211, so as to be clamped in the clamping hole 220 of the connecting sleeve 222.

[0052] As shown in Figures 3 to 5 The fixing member in the embodiment includes a sleeve 122, an avoiding hole 1221 is arranged in the sleeve 122 and communicates with the second mounting hole 1211 along the axial direction of the second mounting hole 1211, the sleeve 122 is sleeved on the connecting sleeve 222 through the avoiding hole 1221, the outer peripheral surface of the sleeve 122 is connected with the inner wall surface of the connecting shell 121 along the radial direction of the avoiding hole 1221, and the first fixing ring 311, the second fixing ring 312, and the compression spring 32 are all located in the avoiding hole 1221. Since the sleeve 122 is sleeved on the connecting sleeve 222 and connected with the inner wall surface of the connecting shell 121, the first bearing 52 can be limited at the third groove 51. Meanwhile, since the first fixing ring 311, the second fixing ring 312, and the compression spring 32 are all located in the avoiding hole 1221, the space utilization of the mounting cavity 101 is improved, the safety protection performance of the damping assembly 30 is improved, and the structure of the damping assembly and the mounting shell 10 after assembly is more compact and reliable.

[0053] In addition, as shown in Figures 3 to 5As shown, the sleeve 122 and the inner wall surface of the connecting shell 121 are provided with a screw joint structure 60, which includes an inner threaded section 61 and an outer threaded section 62. The inner threaded section 61 is arranged on the inner wall surface of the connecting shell 121 and located on the side of the boss 1212 close to the main shell part 11. The outer threaded section 62 is arranged on the outer peripheral surface of the sleeve 122. The outer threaded section 62 of the sleeve 122 is screwed with the inner threaded section 61 in the connecting shell 121, so as to connect the sleeve 122 and the connecting shell 121 together, which is convenient and reliable.

[0054] For the purposes of the description hereinafter, the terms "upper", "lower", "right", "left", "rear", "front", "vertical", "horizontal", and derivatives thereof shall relate to the application as oriented in the drawings. However, it is to be understood that the application can assume various alternative orientations and, accordingly, such terms are not to be taken as limitations of the present application, except where so expressly defined by the specification. All such modifications and variations are considered to be within the scope of the application as defined by the appended claims.

[0055] In addition, it should be pointed out that the use of "first", "second" and the like words to define parts only facilitates the distinction of the corresponding parts, and the above words have no special meaning unless otherwise stated, and therefore cannot be understood as a limitation on the scope of protection of the present application.

[0056] The above only is the preferred embodiment of the present application, and is not intended to limit the present application. For those skilled in the art, the present application can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the scope of protection of the present application.

Claims

1. A grinding device, characterized by, The application relates to a grinding device. The grinding device comprises a mounting shell (10) provided with a mounting cavity (101), a grinding assembly (20) and a damping assembly (30). The grinding assembly (20) comprises a transmission part (21) and a clamping body (22), and the transmission part (21) and the clamping body (22) are mounted in the mounting cavity (101). The clamping body (22) is provided with a clamping hole (220) extending along the axial direction of the clamping body (22) and located on the side of the clamping body (22) away from the transmission part (21). The damping assembly (30) is mounted in the mounting cavity (101) and connected with the clamping body (22), and the damping assembly (30) is located on the side of the clamping hole (220) along the radial direction of the clamping hole (220). The clamping body (22) comprises a connecting shaft (221) and a connecting sleeve (222). The connecting shaft (221) is connected with the transmission part (21) at one end.

2. The grinding device of claim 1, wherein The connecting sleeve (222) is connected with the connecting shaft (221) at the end away from the transmission part (21). The clamping hole (220) penetrates through the connecting sleeve (222) along the axial direction of the connecting shaft (221). The damping assembly (30) comprises a limiting part (31), a compression spring (32) and a second fixed ring (312). The limiting part (31) is arranged on the connecting sleeve (222) and surrounds the outer circumferential surface of the connecting sleeve (222) to form a limiting space. The compression spring (32) is arranged on the connecting sleeve (222) and located in the limiting space. The opposite ends of the compression spring (32) are respectively in abutment with the inner wall surfaces on the opposite sides of the limiting space along the axial direction of the compression spring (32). The limiting part (31) comprises the first fixed ring (311), the second fixed ring (312) and a second stop structure (50). The first fixed ring (311) is arranged on the connecting sleeve (222) and provided with a first stop structure (40). The first stop structure (40) stops the first fixed ring (311) on the side of the connecting sleeve (222) close to the connecting shaft (221). The second fixed ring (312) is arranged on the connecting sleeve (222) and provided with the second stop structure (50). The second stop structure (50) stops the second fixed ring (312) on the side of the first fixed ring (311) away from the connecting shaft (221). The second fixed ring (312) has an installation gap with the first fixed ring (311). The compression spring (32) is located in the installation gap and in abutment with the first fixed ring (311) and the second fixed ring (312) respectively.

3. The grinding device of claim 2, wherein The first fixed ring (311) and the second fixed ring (312) are provided with a first groove (313) on the side close to each other, the first groove (313) extends along the circumference of the connecting sleeve (222), the spiral turns at the end of the compression spring (32) are matched with and embedded in the first groove (313).

4. The grinding device of claim 2, wherein The first stop structure (40) comprises a second groove (41), the second groove (41) is recessed on the surface of the connecting sleeve (222) on the side close to the connecting shaft (221), the second groove (41) extends along the circumference of the connecting sleeve (222), along the radial direction of the connecting sleeve (222), the first fixed ring (311) is at least partially embedded in the second groove (41) on the side close to the connecting sleeve (222).

5. The grinding device of claim 4, wherein Along the radial direction of the connecting sleeve (222), the side wall of the second groove (41) on the side close to the connecting shaft (221) is higher than the side wall on the side far away from the connecting shaft (221).

6. The grinding device according to any one of claims 2 to 4, characterized in that The second stop structure (50) comprises: A third groove (51) is arranged on the inner wall surface of the mounting shell (10), and the slot of the third groove (51) faces the connecting sleeve (222); A first bearing (52) is sleeved on the connecting sleeve (222) and abuts against the side of the second fixed ring (312) far away from the first fixed ring (311), and the first bearing (52) is at least partially embedded in the third groove (51) away from the outer side of the connecting sleeve (222).

7. The grinding device of claim 6, wherein The mounting cavity (101) comprises a first mounting hole (111) and a second mounting hole (1211), and the mounting shell (10) comprises: A main shell component (11), the first mounting hole (111) is arranged in the main shell component (11); A first shell component (12), the first shell component (12) comprises a connecting shell (121) and a fixing part, the connecting shell (121) is connected with the main shell component (11), the second mounting hole (1211) is arranged in the connecting shell (121) and communicates with the first mounting hole (111), the inner wall surface of the second mounting hole (1211) on the side far away from the main shell component (11) is provided with a boss (1212) along the axial direction of the second mounting hole (1211), the fixing part is connected with the inner wall surface of the connecting shell (121), the fixing part is located on the side close to the main shell component (11) of the boss (1212) and forms the third groove (51) with the boss (1212); A second shell component (13), the second shell component (13) is connected with the connecting shell (121), and a connecting hole (131) is arranged in the second shell component (13), and the connecting hole (131) communicates with the second mounting hole (1211).

8. The grinding device of claim 7, wherein The fixing part comprises: A sleeve (122) is provided with an avoiding hole penetrating through the sleeve (122) along the axial direction of the second mounting hole (1211), the avoiding hole is communicated with the second mounting hole (1211), the sleeve (122) is sleeved on the connecting sleeve (222) through the avoiding hole, the outer circumferential surface of the sleeve (122) is connected with the inner wall surface of the connecting shell (121) along the radial direction of the avoiding hole, and the first fixing ring (311), the second fixing ring (312) and the compression spring (32) are located in the avoiding hole.

9. The grinding device of claim 8, wherein, A screw joint structure (60) is arranged between the sleeve (122) and the inner wall surface of the connecting shell (121), and the screw joint structure (60) comprises: An inner thread segment (61) is arranged on the inner wall surface of the connecting shell (121) and located on the side of the boss (1212) close to the main shell part (11); An outer thread segment (62) is arranged on the outer circumferential surface of the sleeve (122), and the thread of the outer thread segment (62) is matched with the thread of the inner thread segment (61).

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