A rolling tool for processing a piston pin bore sealing tube

Abstract

The utility model provides a kind of rolling tool for piston pin inner hole sealing tube processing, belong to internal combustion engine parts processing technical field, including main body mechanism, including processing table, control box being fixedly installed in the top of processing table, and rolling mechanism being fixedly installed in the top of control box one side;Clamping mechanism, including fixedly installed in the top of processing table horizontal adjusting assembly.The utility model is through the synergies of horizontal adjusting assembly, height adjusting assembly and clamping assembly, can flexibly adjust the horizontal position and height of clamping assembly, accurately adapt the processing demand of different specifications sealing tube, without complex debugging, significantly improve processing efficiency and reduce cost, clamping assembly uses V-shaped clamping block and multi-connecting rod transmission structure, cooperate the orientation limit of limiting ring and limiting sleeve, can stably firmly hold sealing tube, avoid the security risk and positioning deviation of artificial fixation, effectively reduce processing defect, guarantee the reliability and consistency of product quality.

Description

Technical Field

[0001] This utility model belongs to the field of internal combustion engine parts processing technology, specifically relating to a rolling tool for processing piston pin inner hole sealing tubes. Background Technology

[0002] Internal combustion engine component machining is the process of machining various parts (such as cylinder blocks, pistons, crankshafts, connecting rods, valves, etc.) that make up an internal combustion engine from raw materials such as steel and aluminum alloys through various machining techniques such as turning, milling, and grinding. The aim is to make the components meet the geometric parameters and technical performance requirements of the design, and to ensure the assembly accuracy and operational reliability of the internal combustion engine. It is a key link in the production and manufacturing of internal combustion engines.

[0003] In the manufacturing process of piston pin inner bore sealing tubes, roller burnishing is a key process, and its processing accuracy directly affects the performance and quality of the sealing tube. Traditional roller burnishing tools for piston pin inner bore sealing tubes do not have clamping tools, requiring workers to hold them by hand during processing. This not only fails to meet the high precision requirements but also reduces production efficiency and affects worker safety. Some more advanced roller burnishing tools for piston pin inner bore sealing tubes use clamping structures, but they are relatively rudimentary and difficult to achieve precise positioning and stable clamping. As a result, the dimensional accuracy of the processed sealing tube cannot meet the high standard requirements, seriously affecting product quality. Utility Model Content

[0004] The purpose of this utility model is to provide a rolling tool for machining the inner hole sealing tube of a piston pin, which aims to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution:

[0006] A rolling tool for machining the inner bore sealing tube of a piston pin, comprising:

[0007] The main structure includes a processing table, a control box fixedly installed on the top of the processing table, and a rolling mechanism fixedly installed on one side of the top of the control box;

[0008] The clamping mechanism includes a horizontal adjustment component fixedly installed on the top of the processing table, a height adjustment component fixedly installed on the top of the horizontal adjustment component, and a clamping component fixedly installed on the top of the height adjustment component. The clamping component is used to clamp the sealing tube.

[0009] As a preferred embodiment of this utility model, the rolling mechanism includes a rolling roller disposed on one side of the control box and a positioning roller disposed at the bottom of the rolling roller. The rolling roller is used to roll the sealing tube, and the positioning roller is used to position and support the sealing tube.

[0010] As a preferred embodiment of this utility model, the horizontal adjustment component includes a servo motor adapted to be installed on the top of the processing table, a threaded rod fixedly connected to the output end of the servo motor via a coupling, and a threaded block sleeved on the outer surface of the threaded rod and threadedly connected thereto. The threaded rod is rotatably connected to the top of the processing table via a bearing seat.

[0011] As a preferred embodiment of this utility model, the horizontal adjustment assembly further includes connecting rods symmetrically arranged on both sides of the threaded block, and two guide rods symmetrically arranged on both sides of the threaded rod. One end of the connecting rod is fixedly connected to the outer surface of the threaded block, and the other end is slidably sleeved on the outer surface of the guide rod. The guide rod is fixedly installed on the top of the processing table through a bearing seat.

[0012] As a preferred embodiment of this utility model, the height adjustment assembly includes an adjustment cylinder adapted to be installed on the top of the threaded block, a slider fixedly connected to the output end of the adjustment cylinder, and four lifting blocks fixedly installed on the top of the slider. The slider slides in contact with the top of the threaded block, and the four lifting blocks are symmetrically distributed in pairs.

[0013] As a preferred embodiment of the present invention, the height adjustment assembly further includes pulleys that slide in contact with the outer surface of the top of the lifting block, mounting seats fixedly installed on the top of the four pulleys, and a number of limiting rods fixedly installed at the bottom of the mounting seats. The limiting rods pass through the threaded block and slide in contact with its inner surface.

[0014] As a preferred embodiment of the present invention, the clamping assembly includes a mounting post fixedly installed on the top of the mounting base, a clamping cylinder adapted to be installed on the outer surface of the mounting post, an extension shaft fixedly connected to the output end of the clamping cylinder, and a limiting ring fixedly installed on the outer surface of the mounting post, wherein the extension shaft and the limiting ring are in sliding contact.

[0015] As a preferred embodiment of this utility model, the clamping assembly further includes a mounting plate rotatably connected to the end of the extension shaft, three transmission rods with one end rotatably connected to the mounting plate, and a transmission block rotatably connected to the other end of the transmission rod.

[0016] As a preferred embodiment of the present invention, the clamping assembly further includes a clamping block fixedly installed on the outer surface of the transmission block, and a limiting sleeve rotatably sleeved on the outer surface of the limiting ring, the limiting sleeve being used to guide and limit the transmission block.

[0017] Compared with the prior art, the beneficial effects of this utility model are as follows: through the synergistic effect of the horizontal adjustment component, the height adjustment component and the clamping component, the horizontal position and height of the clamping component can be flexibly adjusted to accurately adapt to the processing requirements of sealing tubes of different specifications. No complicated debugging is required, which significantly improves processing efficiency and reduces costs. The clamping component adopts a V-shaped clamping block and a multi-link transmission structure. With the guide and limit of the limiting ring and the limiting sleeve, the sealing tube can be stably and firmly clamped, avoiding the safety risks and positioning deviations of manual fixing, effectively reducing processing defects, and ensuring the reliability and consistency of product quality. Attached Figure Description

[0018] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. Among them:

[0019] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0020] Figure 2 This is a schematic cross-sectional view of the overall structure of this utility model;

[0021] Figure 3 This is a schematic diagram of the horizontal adjustment component structure of this utility model;

[0022] Figure 4 This is a schematic diagram of the height adjustment component structure of this utility model;

[0023] Figure 5 This is a schematic diagram of the height adjustment component structure from another angle of this utility model;

[0024] Figure 6 This is a schematic diagram of the clamping component structure of this utility model;

[0025] Figure 7 This is a schematic diagram of the clamping component of this utility model.

[0026] Figure 8 For the present utility model Figure 7 Schematic diagram of the structure at point A in the middle.

[0027] In the diagram: 100. Main structure; 101. Processing table; 102. Control box; 103. Rolling mechanism; 103a. Rolling roller; 103b. Positioning roller; 200. Clamping mechanism; 201. Horizontal adjustment assembly; 201a. Servo motor; 201b. Threaded rod; 201c. Threaded block; 201d. Connecting rod; 201e. Guide rod; 202. Height adjustment assembly; 202a. Adjustment... Throttle cylinder; 202b, slider; 202c, lifting block; 202d, pulley; 202e, mounting base; 202f, limit rod; 203, clamping assembly; 203a, mounting post; 203b, clamping cylinder; 203c, extension shaft; 203d, limit ring; 203e, mounting plate; 203f, transmission rod; 203g, transmission block; 203h, clamping block; 203i, limit sleeve. Detailed Implementation

[0028] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, the specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings.

[0029] Many specific details are set forth in the following description in order to provide a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Those skilled in the art can make similar extensions without departing from the spirit of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0030] Secondly, the term "an embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The phrase "in one embodiment" appearing in different places in this specification does not necessarily refer to the same embodiment, nor is it a single or selective embodiment that excludes other embodiments.

[0031] Example 1

[0032] Reference Figure 1-8 This is the first embodiment of the present invention, which provides a rolling tool for machining the inner hole sealing tube of a piston pin, comprising:

[0033] The main structure 100 includes a processing table 101, a control box 102 fixedly installed on the top of the processing table 101, and a rolling mechanism 103 fixedly installed on one side of the top of the control box 102.

[0034] The clamping mechanism 200 includes a horizontal adjustment component 201 fixedly installed on the top of the processing table 101, a height adjustment component 202 fixedly installed on the top of the horizontal adjustment component 201, and a clamping component 203 fixedly installed on the top of the height adjustment component 202. The clamping component 203 is used to clamp the sealing tube.

[0035] It should be noted that the processing table 101 serves as the basic load-bearing component of the entire tool, providing a stable mounting platform for other components. The control box 102 is used to control the operation of each component. The rolling mechanism 103 is the main component for the rolling of the sealing tube. The horizontal adjustment component 201 is used to adjust the clamping component 203 in the horizontal direction, and the height adjustment component 202 is used to fine-tune the height of the clamping component 203.

[0036] Specifically, the rolling mechanism 103 includes a rolling roller 103a disposed on one side of the control box 102, and a positioning roller 103b disposed at the bottom of the rolling roller 103a. The rolling roller 103a is used to roll the sealing tube, and the positioning roller 103b is used to position and support the sealing tube.

[0037] It should be noted that the outer surface of the positioning roller 103b is fitted with a rotating sleeve for cooperating with the rotation of the sealing tube. The top of the rolling mechanism 103 is equipped with a cylinder, and the rolling roller 103a is fixedly connected to a motor. During rolling, the sealing tube is placed on top of the two positioning rollers 103b and locked between the two positioning rollers 103b. When the cylinder pushes out, it drives the rolling roller 103a to move downward, cooperating with the two positioning rollers 103b to squeeze the sealing tube. At this time, the motor drives the rolling roller 103a to rotate. Due to friction, the sealing tube is also driven to rotate, thereby realizing the 360-degree rolling of the sealing tube.

[0038] Furthermore, the horizontal adjustment assembly 201 includes a servo motor 201a adapted to be installed on the top of the processing table 101, a threaded rod 201b fixedly connected to the output end of the servo motor 201a via a coupling, and a threaded block 201c sleeved on the outer surface of the threaded rod 201b and threadedly connected thereto. The threaded rod 201b is rotatably connected to the top of the processing table 101 via a bearing seat.

[0039] Preferably, the horizontal adjustment assembly 201 further includes connecting rods 201d symmetrically arranged on both sides of the threaded block 201c, and two guide rods 201e symmetrically arranged on both sides of the threaded rod 201b. One end of the connecting rod 201d is fixedly connected to the outer surface of the threaded block 201c, and the other end is slidably sleeved on the outer surface of the guide rod 201e. The guide rod 201e is fixedly installed on the top of the processing table 101 through a bearing seat.

[0040] It should be noted that the connecting rod 201d and the guide rod 201e are used to guide the movement of the threaded block 201c, ensuring the smoothness and accuracy of its movement. The servo motor 201a drives the threaded rod 201b to rotate. Under the rotation of the threaded rod 201b, the threaded block 201c moves linearly along the axis of the threaded rod 201b in coordination with the linear guidance of the guide rod 201e, thereby driving the clamping assembly 203 to move in the horizontal direction.

[0041] Specifically, the height adjustment assembly 202 includes an adjustment cylinder 202a adapted to be installed on the top of the threaded block 201c, a slider 202b fixedly connected to the output end of the adjustment cylinder 202a, and four lifting blocks 202c fixedly installed on the top of the slider 202b. The slider 202b slides in contact with the top of the threaded block 201c, and the four lifting blocks 202c are symmetrically distributed in pairs.

[0042] It should be noted that a slide rail is provided between the slider 202b and the threaded block 201c for the slider 202b to slide. The slider 202b has a U-shaped design with space left in the middle for the installation of the adjusting cylinder 202a.

[0043] Furthermore, the height adjustment assembly 202 also includes pulleys 202d that slide in contact with the top outer surface of the lifting block 202c, mounting bases 202e fixedly installed on the top of the four pulleys 202d, and a number of limiting rods 202f fixedly installed on the bottom of the mounting bases 202e. The limiting rods 202f pass through the threaded block 201c and slide in contact with its inner surface.

[0044] It should be noted that the lifting block 202c is provided with an inclined surface for raising and lowering the mounting base 202e. The pulley 202d slides on the top of the lifting block 202c. The limiting rod 202f is used to prevent the mounting base 202e from tilting or shifting during the raising process. The adjusting cylinder 202a drives the slider 202b to slide on the top of the threaded block 201c through its telescopic movement, thereby driving the lifting block 202c to move forward or backward. When the lifting block 202c moves, it lifts or lowers the pulley 202d and the mounting base 202e on the top of the pulley 202d through its own inclined surface, so as to realize the precise fine adjustment of the clamping assembly 203 in the height direction.

[0045] Furthermore, the clamping assembly 203 includes a mounting post 203a fixedly mounted on the top of the mounting base 202e, a clamping cylinder 203b adapted to be mounted on the outer surface of the mounting post 203a, an extension shaft 203c fixedly connected to the output end of the clamping cylinder 203b, and a limiting ring 203d fixedly mounted on the outer surface of the mounting post 203a, with the extension shaft 203c and the limiting ring 203d in sliding contact.

[0046] It should be noted that the extension shaft 203c is used to move the installation position of the clamping cylinder 203b away from the clamping area, thereby making the structure of the clamping assembly 203 compact and facilitating the clamping of small objects such as sealing tubes. The clamping cylinder 203b controls the movement of the extension shaft 203c by telescoping, and the limiting ring 203d is used to guide and support the movement of the extension shaft 203c to ensure the accuracy of its movement.

[0047] Preferably, the clamping assembly 203 further includes a mounting plate 203e rotatably connected to the end of the extension shaft 203c, three transmission rods 203f with one end rotatably connected to the mounting plate 203e, and a transmission block 203g rotatably connected to the other end of the transmission rods 203f.

[0048] Specifically, the clamping assembly 203 also includes a clamping block 203h fixedly installed on the outer surface of the transmission block 203g, and a limiting sleeve 203i rotatably sleeved on the outer surface of the limiting ring 203d. The limiting sleeve 203i is used to guide and limit the transmission block 203g.

[0049] It should be noted that the clamping surface of the clamping block 203h is V-shaped, which can stably clamp sealing tubes of different sizes. The end face of the limiting sleeve 203i is provided with limiting grooves to limit the three transmission blocks 203g. The transmission blocks 203g can only slide radially along the limiting grooves. The clamping cylinder 203b controls the extension shaft 203c to move axially through telescopic control. When the extension shaft 203c moves, it drives the mounting plate 203e to move axially. When the mounting plate 203e moves axially, it drives the transmission block 203g to move radially toward the mounting plate 203e through the transmission rod 203f. The movement of the transmission block 203g causes the clamping block 203h to clamp or release the sealing tube. The limiting sleeve 203i is used to guide and limit the transmission block 203g. Since the mounting plate 203e is rotatably connected to the extension shaft 203c, the limiting sleeve 203i is rotatably sleeved on the outer surface of the limiting ring 203d, and the clamping block 203h can rotate freely with the sealing tube.

[0050] When in use, the sealing tube is placed in the clamping assembly 203, and the clamping cylinder 203b is activated. The output end of the clamping cylinder 203b drives the extension shaft 203c to move axially within the limiting ring 203d. When the extension shaft 203c moves, it drives the mounting plate 203e, which is rotatably connected to its end, to move axially. The mounting plate 203e drives the transmission block 203g to move radially toward the mounting plate 203e through three transmission rods 203f. Since the end face of the limiting sleeve 203i is provided with a limiting groove to limit the three transmission blocks 203g, the transmission blocks 203g can only slide radially along the limiting groove. The movement of the transmission block 203g drives the clamping block 203h fixed on its outer surface to clamp the sealing tube.

[0051] Next, the servo motor 201a is started. The servo motor 201a drives the threaded rod 201b to rotate via a coupling. Since the threaded block 201c is threadedly connected to the threaded rod 201b, under the guidance of the connecting rod 201d and the guide rod 201e, the threaded block 201c moves linearly along the axis of the threaded rod 201b, causing the height adjustment component 202 and the clamping component 203 mounted above it to move horizontally. The horizontal adjustment component 201 places the sealing tube on top of the two positioning rollers 103b of the rolling mechanism 103. Then, the adjusting cylinder 202a is started. A drive slider 202b slides on the slide rail at the top of the threaded block 201c. When slider 202b moves, the four lifting blocks 202c fixed on it move accordingly. Since the lifting blocks 202c are provided with inclined surfaces, when the lifting blocks 202c move forward or backward, the pulleys 202d that slide in contact with the outer surface of the top of the lifting blocks 202c will rise or fall along the inclined surfaces, thereby driving the mounting base 202e fixed on the top of the pulleys 202d to rise and fall, thereby driving the sealing tube to adjust to a suitable height, so that the sealing tube is stably placed between the two positioning rollers 103b. Finally, the rolling mechanism 103 is started to roll it.

[0052] In summary, through the coordinated operation of the horizontal adjustment component 201 and the height adjustment component 202, the horizontal position and height of the clamping component 203 can be adjusted quickly and accurately, meeting the processing requirements of piston pin inner hole sealing tubes of different specifications. This eliminates the need for complex debugging and equipment replacement, significantly improving the equipment's versatility and processing efficiency, and reducing production costs. The clamping component 203 adopts a unique structural design. The clamping cylinder 203b drives the extension shaft 203c to move, which in turn drives the transmission block 203g for clamping via the mounting plate 203e and the transmission rod 203f. Combined with the V-shaped clamping block 203h, it can stably and firmly clamp sealing tubes of different sizes, eliminating the need for manual hand-holding of the sealing tube and greatly reducing the risks during the rolling process. The limiting ring 203d and the limiting sleeve 203i guide and limit the extension shaft 203c and the transmission block 203g respectively, ensuring accurate and stable clamping and effectively preventing the sealing tube from shifting or shaking during processing, thus guaranteeing high-precision machining.

[0053] It is important to note that the constructions and arrangements of this application shown in several different exemplary embodiments are merely illustrative. Although only a few embodiments are described in detail in this disclosure, those who consult this disclosure will readily understand that many modifications are possible (e.g., changes in the size, dimensions, structure, shape and proportion of various elements, as well as parameter values ​​(e.g., temperature, pressure, etc.), mounting arrangements, use of materials, color, orientation, etc.) without substantially departing from the novel teachings and advantages of the subject matter described in this application). For example, an element shown as integrally formed may be composed of multiple parts or elements, the position of elements may be inverted or otherwise altered, and the nature or number or position of discrete elements may be changed or altered. Therefore, all such modifications are intended to be included within the scope of this utility model. The order or sequence of any process or method steps may be changed or rearranged according to alternative embodiments. In the claims, any "device plus function" clause is intended to cover the structure described herein that performs the function, and not only structural equivalents but also equivalent structures. Without departing from the scope of this invention, other substitutions, modifications, alterations, and omissions may be made in the design, operation, and arrangement of the exemplary embodiments. Therefore, this invention is not limited to the specific embodiments, but extends to various modifications that still fall within the scope of the appended claims.

[0054] Furthermore, in order to provide a concise description of exemplary embodiments, not all features of actual embodiments (i.e., those features that are not relevant to the best mode of carrying out the present invention as currently considered, or those features that are not relevant to implementing the present invention) may be omitted.

[0055] It should be understood that numerous specific implementation decisions can be made during the development of any practical implementation, such as in any engineering or design project. Such development efforts may be complex and time-consuming, but for those skilled in the art who benefit from this disclosure, the development effort will be a routine work of design, manufacturing, and production without requiring much experimentation.

[0056] It should be noted that the above embodiments are only used to illustrate the technical solution of this utility model and are not intended to limit it. Although this utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solution of this utility model without departing from the spirit and scope of the technical solution of this utility model, and all such modifications or substitutions should be covered within the scope of the claims of this utility model.

Claims

1. A rolling tool for machining the inner hole sealing tube of a piston pin, characterized in that: include, The main structure (100) includes a processing table (101), a control box (102) fixedly installed on the top of the processing table (101), and a rolling mechanism (103) fixedly installed on one side of the top of the control box (102); The clamping mechanism (200) includes a horizontal adjustment component (201) fixedly installed on the top of the processing table (101), a height adjustment component (202) fixedly installed on the top of the horizontal adjustment component (201), and a clamping component (203) fixedly installed on the top of the height adjustment component (202), the clamping component (203) being used to clamp the sealing tube.

2. The rolling tool for machining the inner hole sealing tube of a piston pin according to claim 1, characterized in that: The rolling mechanism (103) includes a rolling roller (103a) disposed on one side of the control box (102) and a positioning roller (103b) disposed at the bottom of the rolling roller (103a). The rolling roller (103a) is used to roll the sealing tube, and the positioning roller (103b) is used to position and support the sealing tube.

3. The rolling tool for machining the inner hole sealing tube of a piston pin according to claim 2, characterized in that: The horizontal adjustment assembly (201) includes a servo motor (201a) adapted to be installed on the top of the processing table (101), a threaded rod (201b) fixedly connected to the output end of the servo motor (201a) via a coupling, and a threaded block (201c) sleeved on the outer surface of the threaded rod (201b) and threadedly connected thereto. The threaded rod (201b) is rotatably connected to the top of the processing table (101) via a bearing seat.

4. The rolling tool for machining the inner hole sealing tube of a piston pin according to claim 3, characterized in that: The horizontal adjustment assembly (201) further includes connecting rods (201d) symmetrically arranged on both sides of the threaded block (201c), and two guide rods (201e) symmetrically arranged on both sides of the threaded rod (201b). One end of the connecting rod (201d) is fixedly connected to the outer surface of the threaded block (201c), and the other end is slidably sleeved on the outer surface of the guide rod (201e). The guide rod (201e) is fixedly installed on the top of the processing table (101) through a bearing seat.

5. A rolling tool for machining the inner hole sealing tube of a piston pin according to claim 4, characterized in that: The height adjustment assembly (202) includes an adjustment cylinder (202a) adapted to be installed on the top of the threaded block (201c), a slider (202b) fixedly connected to the output end of the adjustment cylinder (202a), and four lifting blocks (202c) fixedly installed on the top of the slider (202b). The slider (202b) slides in contact with the top of the threaded block (201c), and the four lifting blocks (202c) are symmetrically distributed in pairs.

6. The rolling tool for machining the inner hole sealing tube of a piston pin according to claim 5, characterized in that: The height adjustment assembly (202) further includes pulleys (202d) that slide in contact with the top outer surface of the lifting block (202c), mounting bases (202e) fixedly installed on the top of the four pulleys (202d), and a number of limiting rods (202f) fixedly installed on the bottom of the mounting bases (202e). The limiting rods (202f) pass through the threaded block (201c) and slide in contact with its inner surface.

7. A rolling tool for machining the inner hole sealing tube of a piston pin according to claim 6, characterized in that: The clamping assembly (203) includes a mounting post (203a) fixedly mounted on the top of the mounting base (202e), a clamping cylinder (203b) adapted to be mounted on the outer surface of the mounting post (203a), an extension shaft (203c) fixedly connected to the output end of the clamping cylinder (203b), and a limiting ring (203d) fixedly mounted on the outer surface of the mounting post (203a). The extension shaft (203c) and the limiting ring (203d) are in sliding contact.

8. A rolling tool for machining the inner hole sealing tube of a piston pin according to claim 7, characterized in that: The clamping assembly (203) further includes a mounting plate (203e) rotatably connected to the end of the extension shaft (203c), three transmission rods (203f) rotatably connected at one end to the mounting plate (203e), and a transmission block (203g) rotatably connected to the other end of the transmission rods (203f).

9. A rolling tool for machining the inner hole sealing tube of a piston pin according to claim 8, characterized in that: The clamping assembly (203) further includes a clamping block (203h) fixedly installed on the outer surface of the transmission block (203g), and a limiting sleeve (203i) rotatably sleeved on the outer surface of the limiting ring (203d), the limiting sleeve (203i) being used to guide and limit the transmission block (203g).

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