Press fitting equipment

Abstract

The utility model belongs to the technical field of electronic equipment manufacturing, and discloses press fitting equipment. The press-fitting equipment is used for achieving assembly of a PCB and a shell and specifically comprises a rack, a conveying mechanism, a press-fitting mechanism, a pressing mechanism and a locking mechanism, and the conveying mechanism is arranged on the rack and used for conveying the PCB to a first station; the press-fitting mechanism is arranged on the rack, the shell is arranged on the press-fitting mechanism, and the press-fitting mechanism can convey the shell to a first station and enables the PCB and the shell to be subjected to press-fitting at the first station; the pressing mechanism is arranged on the rack, and the pressing mechanism is used for applying reverse pressing force to the elastic deformation part of the PCB so as to reduce the elastic deformation amount of the PCB during press fitting; the locking mechanism is arranged on the rack and used for conducting screw locking on the PCB and the shell. According to the utility model, on the basis of realizing press fitting of the PCB and the shell, sufficient contact between the electronic device of the PCB and the heat dissipation glue is further ensured, the contact area of the heat dissipation glue is increased, and the heat dissipation effect after product assembly is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of electronic equipment manufacturing, in particular to press-fitting equipment. Background Art

[0002] The heat dissipation glue of PCB board (Printed Circuit Board) has excellent thermal conductivity and high thermal conductivity after curing, which provides high-guarantee heat dissipation for electronic products, helps to ensure the stability of high-power electronic products during use, and improves the performance and life of the products.

[0003] Among them, the service life of the inverter in high and low temperature environments and good heat dissipation performance are important guarantees of product quality, and the contact area between electronic components on the PCB board and the heat dissipation glue is a very important influencing factor.

[0004] In the actual production process, the PCB board will be fixed to the housing through the process of press-fitting and screw tightening. During the press-fitting process of the PCB board, the PCB board will produce a certain elastic deformation, which will increase the volume of the electronic components on the PCB board immersed in the heat dissipation glue, that is, some glue will overflow the theoretical contact position, so when the press-fitting mechanism is reset, the elastic deformation will be restored, and the area of ​​the electronic components on the PCB board contacting the heat dissipation glue will be reduced, seriously affecting the heat dissipation effect. Utility Model Content

[0005] The purpose of the utility model is to provide a press-fitting device, which is used to realize the press-fitting of a PCB board and a housing, and can further ensure that the electronic components on the PCB board are in full contact with the heat dissipation glue, increase the area in contact with the heat dissipation glue, and improve the heat dissipation effect of the product after assembly.

[0006] To achieve this purpose, the utility model adopts the following technical solutions:

[0007] Press-fit equipment, used to assemble PCB boards and housings, including:

[0008] frame;

[0009] A conveying mechanism, provided on the frame, for conveying the PCB board to the first station;

[0010] A press-fitting mechanism is arranged on the frame, the housing is arranged on the press-fitting mechanism, and the press-fitting mechanism can transport the housing to the first station and complete the press-fitting of the PCB board and the housing at the first station;

[0011] A clamping mechanism, disposed on the frame, for applying a reverse clamping force to a portion of the PCB board where elastic deformation occurs, thereby reducing the elastic deformation of the PCB board;

[0012] A locking mechanism is arranged on the frame, and is used to screw the PCB board and the housing.

[0013] As an optional solution for the press-fitting equipment, the conveying mechanism includes a conveying component and a positioning fixture arranged on the conveying component, the positioning fixture is used to place the PCB board, and the conveying component can convey the PCB board to below the first workstation along a first direction.

[0014] As an optional solution of the press-fitting equipment, the conveying mechanism further includes a lifting assembly, which is arranged on the conveying assembly and is used to drive the positioning fixture to convey the PCB board to the first station.

[0015] As an optional solution for the press-fitting device, the conveying assembly includes a first driving member and a slide rail, the positioning fixture is slidably connected to the slide rail, and the first driving member is drivingly connected to the positioning fixture.

[0016] As an optional solution of the press-fitting equipment, the press-fitting mechanism includes a press located below the first station and a lifting plate transmission-connected to the press, and the shell is located on the lifting plate.

[0017] As an optional solution for the pressing device, the clamping mechanism includes a mounting plate located at the first workstation, and a plurality of second driving members and clamps connected to the second driving members are provided on the mounting plate, and the second driving members are used to drive the clamps to hook the PCB board and keep the PCB board at the first workstation.

[0018] As an optional solution for the press-fitting equipment, a plurality of third driving members are provided on the mounting plate, and the third driving members are drivingly connected to the pressing sleeve, and the third driving members are used to drive the pressing sleeve to press the part of the PCB board that undergoes elastic deformation.

[0019] As an optional solution of the press-fitting device, the press sleeve is elastic.

[0020] As an optional solution of the press-fitting device, the locking mechanism includes a translation component and a tightening component, the tightening component is arranged on the translation component, and the translation component is used to drive the tightening component to move along the horizontal plane and the vertical plane.

[0021] As an optional solution of the pressing equipment, the translation assembly includes a first shaft driving member, a second shaft driving member arranged on the first shaft driving member and a third shaft driving member arranged on the second shaft driving member, and the tightening assembly is arranged at the driving end of the third shaft driving member.

[0022] Beneficial effects:

[0023] In the utility model, the frame is used to carry and position the conveying mechanism, the pressing mechanism, the clamping mechanism and the locking mechanism. The conveying mechanism can convey the PCB board to the bottom of the first station in the horizontal direction, and then lift it to the first station. The operator manually places the shell on the installation position, and then lifts the shell to the first station through the pressing mechanism to complete the pressing with the PCB board. The device applies a reverse pressing force to the part of the PCB board where elastic deformation occurs by setting a clamping mechanism to reduce the elastic deformation generated when the PCB board is pressed with the shell, ensuring that the electronic components on the PCB board are in full contact with the heat dissipation glue, and effectively improving the heat dissipation of the electronic components on the PCB board. Through this device, on the basis of realizing the pressing of the PCB board and the shell, it can further ensure that the electronic components on the PCB board are in full contact with the heat dissipation glue, increase the area of ​​contact with the heat dissipation glue, and improve the heat dissipation effect of the product after assembly. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a front view of the press-fitting device provided by an embodiment of the utility model;

[0025] Figure 2 It is a side view of the press-fitting device provided by an embodiment of the utility model;

[0026] Figure 3 is a top view of the press-fitting device provided by an embodiment of the utility model;

[0027] Figure 4 It is an axonometric diagram of the press-fitting device provided in the embodiment of the utility model;

[0028] Figure 5 It is a front view of the conveying mechanism provided by the embodiment of the utility model;

[0029] Figure 6 It is a top view of the conveying mechanism provided by the embodiment of the utility model;

[0030] Figure 7 It is a side view of the conveying mechanism provided by the embodiment of the utility model;

[0031] Figure 8 It is an axonometric diagram of the conveying mechanism provided by the embodiment of the utility model;

[0032] Fig. 9 It is a front view of the press-fitting mechanism provided by an embodiment of the utility model;

[0033] Fig.10 It is a top view of the press-fitting mechanism provided in the embodiment of the utility model;

[0034] Fig.11 It is an axonometric diagram of the press-fitting mechanism provided in the embodiment of the utility model;

[0035] Fig.12 It is a bottom view of the clamping mechanism provided by the embodiment of the utility model;

[0036] Fig.13 It is an axonometric diagram of the clamping mechanism provided by the embodiment of the utility model;

[0037] Fig.14 It is an axonometric diagram of the locking mechanism provided in the embodiment of the utility model;

[0038] Fig.15 It is a front view of the locking mechanism provided in an embodiment of the utility model.

[0039] In the figure:

[0040] X, first direction;

[0041] 1. The first station;

[0042] 100, frame; 110, frame plate; 120, support column; 130, reinforcement plate;

[0043] 200, conveying mechanism; 210, conveying assembly; 211, first driving member; 212, slide rail; 220, positioning fixture; 230, lifting assembly;

[0044] 300, press-fitting mechanism; 310, press machine; 320, lifting plate; 330, guide column;

[0045] 400, clamping mechanism; 410, mounting plate; 411, second driving member; 412, clamping claw; 413, third driving member; 414, pressing sleeve;

[0046] 500, locking mechanism; 510, translation assembly; 511, first shaft driving member; 512, second shaft driving member; 513, third shaft driving member; 520, tightening assembly. DETAILED DESCRIPTION

[0047] The present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for ease of description, only the parts related to the present invention, rather than all structures, are shown in the accompanying drawings.

[0048] In the description of the present invention, unless otherwise clearly specified and limited, the terms "connected", "connected", and "fixed" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0049] In the present utility model, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0050] In the description of this embodiment, the terms "upper", "lower", "right", etc., are based on the directions or positions shown in the drawings, and are only for the convenience of description and simplified operation, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation of the present invention. In addition, the terms "first" and "second" are only used to distinguish in the description and have no special meaning.

[0051] Please refer to the attached Figure 1 -Attached Figure 3 , this embodiment relates to a press-fitting device (hereinafter referred to as "device"), which is mainly used to realize the assembly of a PCB board and a housing, wherein the assembly process of the PCB board and the housing mainly includes: the extrusion installation of the PCB board to the housing and the screwing and locking by screws. Before the press-fitting process of this device begins, the previous process will fill the accommodating part of the housing with heat dissipation glue, and correspondingly, the electronic components on the PCB board will be immersed in the heat dissipation glue accordingly. When the PCB board and the housing are assembled, the heat dissipation glue continues to solidify, thereby ensuring that the electronic components on the PCB board have good heat dissipation.

[0052] The device specifically includes a frame 100, a conveying mechanism 200, a pressing mechanism 300, a clamping mechanism 400 and a locking mechanism 500. The conveying mechanism 200 is arranged on the frame 100, and is used to convey the PCB board to the first station 1; the pressing mechanism 300 is arranged on the frame 100, and the housing is arranged on the pressing mechanism 300, and the pressing mechanism 300 can convey the housing to the first station 1 and complete the press-fitting of the PCB board and the housing at the first station 1; the clamping mechanism 400 is arranged on the frame 100, and is used to apply a reverse clamping force to the elastically deformed part of the PCB board to reduce the elastic deformation amount generated when the PCB board and the housing are pressed; the locking mechanism 500 is arranged on the frame 100, and is used to screw the PCB board and the housing.

[0053] Please continue to refer to the attached Figure 1 -Attached Figure 4 In this embodiment, the frame 100 is used to carry and position the conveying mechanism 200, the pressing mechanism 300, the pressing mechanism 400 and the locking mechanism 500. The frame 100 is a frame structure composed of two frame plates 110 and a plurality of support columns 120. The two frame plates 110 are arranged horizontally and parallel to each other. The frame plates 110 are connected by a plurality of support columns 120. A reinforcing plate 130 is also arranged on the support column 120. The reinforcing plate 130 is used to strengthen the strength of the entire connection frame and prevent the support column 120 from tilting. The conveying mechanism 200 is between the two frame plates 110, and can convey the PCB board to the bottom of the first station 1 in the horizontal direction, and then lift it to the first station 1. The press-fitting mechanism 300 is connected to the rack plate 110 at the bottom. At the same time, a mounting position for fixing and limiting the shell is provided on the top of the press-fitting mechanism 300. The operator manually places the shell on the mounting position, and then lifts the shell to the first station 1 through the press-fitting mechanism 300 to complete the press-fitting with the PCB board. Due to the interaction between the PCB board and the shell during the press-fitting process, some structures of the PCB board will undergo certain elastic deformation. Due to the existence of elastic deformation, the volume of the electronic devices on the PCB board immersed in the heat dissipation glue will be directly increased. If the locking is performed directly at this time, In the locking process of the attachment mechanism 500, after the heat dissipation glue is cured, part of the glue overflows from the theoretical contact position, which will affect the heat dissipation effect of the electronic components on the PCB board. The device sets a clamping mechanism 400 through the top frame plate 110, and uses the clamping mechanism 400 set on the frame 100 near the first station 1 to apply a reverse clamping force to the elastically deformed part of the PCB board, so as to reduce the elastic deformation generated when the PCB board and the shell are pressed, ensure that the electronic components on the PCB board are in complete contact with the heat dissipation glue, and effectively improve the heat dissipation of the electronic components on the PCB board.

[0054] Through this equipment, on the basis of realizing the press-fitting of the PCB board and the shell, it can further ensure that the electronic components on the PCB board are in full contact with the heat dissipation glue, increase the area in contact with the heat dissipation glue, and improve the heat dissipation effect after product assembly.

[0055] Please refer to the attached Figure 5 -Attached Figure 8 Optionally, the conveying mechanism 200 includes a conveying component 210 and a positioning fixture 220 arranged on the conveying component 210, the positioning fixture 220 is used to place the PCB board, and the conveying component 210 can convey the PCB board to the bottom of the first workstation 1 along the first direction X.

[0056] In this embodiment, the positioning fixture 220 is provided with a limiting groove for positioning the PCB board, and the conveying component 210 can drive the positioning fixture 220 to move along the first direction X in the form of conventional electric drive or hydraulic drive.

[0057] Furthermore, the conveying assembly 210 includes a first driving member 211 and a slide rail 212 , the positioning fixture 220 is slidably connected to the slide rail 212 , and the first driving member 211 is transmission-connected to the positioning fixture 220 .

[0058] In this embodiment, the first driving member 211 can be a driving cylinder, and two slide rails 212 are arranged in parallel. The two slide rails 212 extend along the first direction X and are fixed to the inner wall of the corresponding support column 120 by clamping or screwing. The length of the slide rail 212 is greater than the length of the frame plate 110, that is, part of the structure of the slide rail 212 extends outside the frame 100. The initial position of the positioning fixture 220 is located at one end of the slide rail 212 on the outside, which can facilitate the operator to place the PCB board on the positioning fixture 220 at the initial position. The first driving member 211 is also screwed and fixed to the support column 120 and is located directly below the slide rail 212 on one side. The first driving member 211 drives the positioning fixture 220 to move along the slide rail 212 from the initial position to the bottom of the first station 1.

[0059] Optionally, the conveying mechanism 200 further includes a lifting assembly 230 , which is disposed on the conveying assembly 210 and is used to drive the positioning fixture 220 to convey the PCB board to the first station 1 .

[0060] The lifting assembly 230 includes a lifting cylinder connected to the slide rail 212. There are two groups of lifting cylinders, each with two, and the two groups of lifting cylinders are respectively arranged near the slide rails 212 on both sides. When the positioning fixture 220 is transported to the bottom of the first station 1, the lifting cylinder can further lift the positioning fixture 220 upward to transport the PCB board to the first station 1.

[0061] Please refer to the attached Fig. 9 -Attached Fig.11Optionally, the press-fitting mechanism 300 includes a press 310 located below the first station 1 and a lifting plate 320 transmission-connected to the press 310 , and the shell is located on the lifting plate 320 .

[0062] In this embodiment, the press 310 is arranged on the bottom frame plate 110, and the press 310 is located directly below the first station 1. The output end of the press 310 moves in the vertical direction, and the output end of the press 310 is connected to the lifting plate 320. The lifting plate 320 is provided with a mounting position for positioning the shell. At the same time, a plurality of guide columns 330 are provided near the outside of the lifting plate 320. The lifting plate 320 is driven by the press 310 to move upward, and the shell is transported to the first station 1. Under the pressing action of the press 310, the shell and the PCB board are pressed.

[0063] Please see attached Fig.12 and attached Fig.13 Furthermore, the clamping mechanism 400 includes a mounting plate 410 located at the first station 1, and a plurality of second driving members 411 and clamps 412 connected to the second driving members 411 are provided on the mounting plate 410. The second driving members 411 are used to drive the clamps 412 to hook the PCB board and keep the PCB board at the first station 1.

[0064] In this embodiment, the mounting plate 410 is fixed on the downward wall of the frame plate 110 at the top, and a plurality of clamps 412 are provided on the mounting plate 410. The second driving member 411 is a cylinder capable of driving the clamps 412 to complete hooking and picking up. The second driving member 411 drives the clamps 412 to hook the PCB board and keep the PCB board at the first station 1, which can further facilitate the positioning fixture 220 to retract to the initial position, so as to avoid the subsequent lifting of the housing and the lifting plate 320. In this embodiment, the second driving member 411 and the clamps 412 are provided with four groups of four contact positions for hooking the edge of the PCB board. Of course, in other embodiments, the structure, quantity and even type of the second driving member 411 and the clamps 412 can also be selected in a targeted manner according to the type and size of the PCB board.

[0065] Optionally, a plurality of third driving members 413 are provided on the mounting plate 410 , and the third driving members 413 are drivingly connected to the pressing sleeve 414 , and the third driving members 413 are used to drive the pressing sleeve 414 to press the part of the PCB board where elastic deformation occurs.

[0066] The third driving member 413 is a lifting cylinder, and a pressing sleeve 414 is provided on the output end of each lifting cylinder. The third driving member 413 drives the pressing sleeve 414 to press down to realize the elastic recovery of the PCB board. In this embodiment, the third driving member 413 and the pressing sleeve 414 are provided in three groups, corresponding to the main deformation parts of the elastic deformation of the PCB board and the screw screwing parts for targeted compression.

[0067] Furthermore, the pressing sleeve 414 has elasticity.

[0068] In this embodiment, a compression spring is preset on the side of the pressing sleeve 414 away from the PCB board. During the pressing process, the elastic pressing sleeve 414 can avoid rigid contact with the PCB board, causing the PCB board to be squeezed and damaged, thereby reducing the scrap rate. Of course, in other embodiments, the pressing sleeve 414 itself can also be an elastic rubber sleeve.

[0069] Optionally, the locking mechanism 500 includes a translation assembly 510 and a tightening assembly 520 , wherein the tightening assembly 520 is disposed on the translation assembly 510 , and the translation assembly 510 is used to drive the tightening assembly 520 to move along a horizontal plane and a vertical plane.

[0070] Please see attached Fig.14 and attached Fig.15 In this embodiment, the translation component 510 in the locking mechanism 500 can drive the tightening component 520 to move along the horizontal and vertical planes to achieve free movement in three directions of space XYZ. The tightening component 520 is integrated with a screw tightening mechanism to automatically tighten the screws. The tightening component 520 moves to the corresponding position above the PCB board and tightens the screws to achieve the locking of the PCB board and the housing. In this embodiment, the tightening component 520 can use a conventional screw locking mechanism, and its specific structure and working principle will not be elaborated in this embodiment.

[0071] Furthermore, the translation assembly 510 includes a first shaft driving member 511 , a second shaft driving member 512 disposed on the first shaft driving member 511 , and a third shaft driving member 513 disposed on the second shaft driving member 512 , and the tightening assembly 520 is disposed at the driving end of the third shaft driving member 513 .

[0072] In this embodiment, the first shaft driving member 511, the second shaft driving member 512, and the third shaft driving member 513 can all adopt servo electric cylinders, which are easy to assemble, have a compact overall structure, and have high motion accuracy.

[0073] The action steps of this device are:

[0074] First, place the PCB board on the positioning fixture 220 at the initial position, and drive the positioning fixture 220 to move along the slide rail 212 to the bottom of the first station 1 by the first driving member 211, and then lift the positioning fixture 220 to the first station 1 by the lifting assembly 230; start the second driving member 411 to drive the clamping claw 412 to hook the PCB board and keep the PCB board at the first station 1, and the lifting assembly 230 lowers the positioning fixture 220 to the bottom of the first station 1, and the first driving member 211 drives the positioning fixture 220 to retreat to the initial position along the slide rail 212; place the shell on the lifting plate 320, and the press 310 drives the lifting plate 320 to move upward, and the lifting plate 320 0 drives the shell to move to the first station 1, and completes the press-fitting of the shell and the PCB board; before the press machine 310 drives the lifting plate 320 to rise, the third driving member 413 drives the pressing sleeve 414 to press the PCB board, thereby reducing the elastic deformation generated when the PCB board and the shell are press-fitted; finally, the translation component 510 drives the tightening component 520 to move to the position to be locked on the PCB board, and the tightening component 520 completes the locking of the PCB board and the shell. When all the positions to be locked on the PCB board have been locked, the press machine 310 drives the lifting plate 320 to retreat to the initial position, the PCB board and the shell are press-fitted and removed, and the translation component 510 drives the tightening component 520 to retreat to the initial position.

[0075] Obviously, the above embodiments of the present invention are merely examples for the purpose of clearly illustrating the present invention, and are not intended to limit the implementation methods of the present invention. For those skilled in the art, various obvious changes, readjustments and substitutions can be made without departing from the scope of protection of the present invention. It is not necessary and impossible to list all implementation methods here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention shall be included in the scope of protection of the claims of the present invention.

Claims

1. Press-fit equipment, used to realize the assembly of PCB board and housing, characterized in that: include: Rack(100); A conveying mechanism (200), arranged on the frame (100), and used for conveying the PCB board to the first workstation (1); A press-fitting mechanism (300) is arranged on the frame (100), the shell is arranged on the press-fitting mechanism (300), and the press-fitting mechanism (300) can transport the shell to the first station (1) and complete the press-fitting of the PCB board and the shell at the first station (1); A clamping mechanism (400) is arranged on the frame (100), and the clamping mechanism (400) is used to apply a reverse clamping force to a portion of the PCB board where elastic deformation occurs, so as to reduce the elastic deformation amount of the PCB board; A locking mechanism (500) is provided on the frame (100), and the locking mechanism (500) is used to screw the PCB board and the housing.

2. The press-fitting device according to claim 1, characterized in that: The conveying mechanism (200) comprises a conveying component (210) and a positioning fixture (220) arranged on the conveying component (210), wherein the positioning fixture (220) is used to place the PCB board, and the conveying component (210) can convey the PCB board to below the first workstation (1) along a first direction (X).

3. The press-fitting device according to claim 2, characterized in that: The conveying mechanism (200) further comprises a lifting assembly (230), wherein the lifting assembly (230) is arranged on the conveying assembly (210) and is used to drive the positioning fixture (220) to convey the PCB board to the first workstation (1).

4. The press-fitting device according to claim 2, characterized in that: The conveying assembly (210) comprises a first driving member (211) and a slide rail (212), the positioning fixture (220) is slidably connected to the slide rail (212), and the first driving member (211) is transmission-connected to the positioning fixture (220).

5. The press-fitting device according to claim 1, characterized in that: The press-fitting mechanism (300) comprises a press (310) located below the first workstation (1) and a lifting plate (320) drivingly connected to the press (310), and the shell is located on the lifting plate (320).

6. The press-fitting device according to claim 1, characterized in that: The clamping mechanism (400) comprises a mounting plate (410) located at the first work station (1), the mounting plate (410) being provided with a plurality of second driving members (411) and clamping jaws (412) connected to the second driving members (411), the second driving members (411) being used to drive the clamping jaws (412) to hook the PCB board and keep the PCB board at the first work station (1).

7. The press-fitting device according to claim 6, characterized in that: The mounting plate (410) is also provided with a plurality of third driving members (413), the third driving members (413) being drivingly connected to the pressing sleeve (414), and the third driving members (413) being used to drive the pressing sleeve (414) to press the part of the PCB board where elastic deformation occurs.

8. The press-fitting device according to claim 7, characterized in that: The pressing sleeve (414) is elastic.

9. The press-fitting device according to claim 1, characterized in that: The locking mechanism (500) comprises a translation assembly (510) and a tightening assembly (520), wherein the tightening assembly (520) is arranged on the translation assembly (510), and the translation assembly (510) is used to drive the tightening assembly (520) to move along a horizontal plane and a vertical plane.

10. The press-fitting device according to claim 9, characterized in that: The translation assembly (510) comprises a first shaft driving member (511), a second shaft driving member (512) arranged on the first shaft driving member (511), and a third shaft driving member (513) arranged on the second shaft driving member (512), and the tightening assembly (520) is arranged on the driving end of the third shaft driving member (513).

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