Steering gear mounting device

Abstract

The utility model relates to the technical field of automobile parts assembly, disclose a kind of steering gear fixed mounting device, including compression part, first clamping part and second clamping part, first clamping part is arranged on fixed carrier, second clamping part and fixed carrier are slidably connected, first clamping part, second clamping part can rotate around its own axis circumferentially, compression part and fixed carrier are connected by connecting structure, compression part and fixed carrier are oppositely arranged, first clamping part, second clamping part are arranged on the side of fixed carrier towards compression part, the distance between compression part and fixed carrier is adjustable, the clamping part and compression part of the application are adjustable, the self-adapting clamping and fixing of different specifications steering gear are realized, and the generality, efficiency and reliability of assembly process are effectively improved.

Description

Technical Field

[0001] This utility model relates to the field of automotive parts, and in particular to a steering gear fixing and mounting device. Background Technology

[0002] The automotive steering gear, also known as the steering unit or steering mechanism, is the most important component in the automotive steering system. Its function is to increase the force transmitted from the steering wheel to the steering transmission mechanism and change the direction of force transmission. The steering device is the device that controls the direction of the car's movement, and it must meet the following requirements: safe and reliable operation, easy and flexible operation, appropriate steering force, smooth turning performance, and minimal impact from the road.

[0003] When assembling and installing the outer tie rod of a car steering gear, the main structure of the steering gear needs to be fixed to facilitate the connection and installation of the tie rod. However, due to differences in the spacing between the two ends of different models of column steering gears, and the fact that some steering gears have bends at both ends, fixing the steering gear can be inconvenient. Therefore, we propose a steering gear fixing and installation device to facilitate quick, efficient, and reliable fixing of the steering gear. Utility Model Content

[0004] In view of this, the present invention provides a steering gear fixing and mounting device, which is intended to be used when installing the steering gear tie rod. The steering gear fixing and mounting device can fix steering gears of different models and lengths, thereby facilitating installation.

[0005] Specifically, the following technical solutions are included:

[0006] A steering gear fixing and mounting device, characterized in that it includes: a pressing part, a first clamping part, and a second clamping part;

[0007] The first clamping part is disposed on the fixed carrier, and the second clamping part is slidably connected to the fixed carrier. The first clamping part and the second clamping part can rotate circumferentially around their own axes.

[0008] The clamping part and the fixing carrier are connected by a connecting structure. The clamping part and the fixing carrier are arranged opposite to each other. The first clamping part and the second clamping part are arranged on the side of the fixing carrier facing the clamping part. The distance between the clamping part and the fixing carrier is adjustable.

[0009] Optionally, the first clamping part includes a first bracket, a first rotating shaft, and a first clamping seat;

[0010] The first bracket is provided on the fixed carrier, and the first clamping seat is rotatably connected to the first bracket through the first rotating shaft.

[0011] Optionally, the second clamping part includes a second bracket, a second rotating shaft, and a second clamping seat;

[0012] The fixed carrier is provided with a first slide rail, the second bracket is slidably connected to the first slide rail, and the second clamping seat is rotatably connected to the second bracket through the second rotating shaft.

[0013] Optionally, the clamping part includes a support plate, a drive structure, and a clamping plate;

[0014] The support plate and the fixing carrier are connected by the connecting structure;

[0015] The driving structure is disposed on the support plate, and the clamping plate is disposed on the driving end of the driving structure;

[0016] The support plate, the clamping plate, and the fixed carrier are arranged in parallel. The clamping plate is disposed between the support plate and the fixed carrier. The driving structure drives the clamping plate to move away from or towards the fixed carrier.

[0017] Optionally, the steering gear fixing device further includes a third clamping part and a fourth clamping part;

[0018] The third clamping part and the fourth clamping part are disposed on the side of the clamping plate facing the fixed carrier;

[0019] The third clamping part and the fourth clamping part can rotate circumferentially around their own axis.

[0020] Optionally, the clamping plate is provided with a second slide rail and a third slide rail;

[0021] The third clamping part is slidably connected to the second slide rail and the pressure plate;

[0022] The fourth clamping part is slidably connected to the third slide rail and the pressure plate.

[0023] Optionally, the third clamping part includes a third bracket, a third rotating shaft, and a third clamping seat;

[0024] The third bracket and the second slide rail are slidably connected, and the third clamping seat is rotatably connected to the third bracket via the third rotating shaft.

[0025] Optionally, the fourth clamping part includes a fourth bracket, a fourth rotating shaft, and a fourth clamping seat;

[0026] The fourth bracket and the third slide rail are slidably connected, and the fourth clamping seat is rotatably connected to the fourth bracket via the fourth rotating shaft.

[0027] Optionally, the rotation axes of the first clamping part, the second clamping part, the third clamping part, and the fourth clamping part are located in the same plane.

[0028] Optionally, the first clamping seat of the first clamping part, the second clamping seat of the second clamping part, the third clamping seat of the third clamping part, and the fourth clamping seat of the fourth clamping part are all arc-shaped plates.

[0029] The beneficial effects of the technical solution provided by this utility model include at least the following:

[0030] The steering gear fixing device of this application can fix the steering gear in the fixing carrier by setting a clamping part on the fixing carrier, which can play a role in fixing in a space-saving manner. The first clamping part and the second clamping part can be adjusted according to the shape, size and length of the steering gear. When the steering gear is of different lengths and sizes, the adjustable clamping and clamping parts can realize adaptive clamping and fixing of steering gears of different specifications, effectively improving the versatility, efficiency and reliability of the assembly process. Attached Figure Description

[0031] To more clearly illustrate the technical solutions in 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.

[0032] Figure 1 This is a schematic diagram of the overall structure of a steering gear fixing and mounting device according to an embodiment of the present utility model;

[0033] Figure 2 This is a schematic diagram of the structure of the first clamping part according to an embodiment of the present invention;

[0034] Figure 3 This is a schematic diagram of the installation of the third clamping part and the fourth clamping part according to an embodiment of the present invention.

[0035] The reference numerals in the figure are respectively:

[0036] 1. Fixed carrier; 2. Connecting structure; 3. Pressing part; 301. Driving structure; 302. Support plate; 303. Pressing plate; 4. First clamping part; 401. First bracket; 402. First rotating shaft; 403. First clamping seat; 5. Second clamping part; 6. First slide rail; 7. Third clamping part; 8. Second slide rail; 9. Fourth clamping part; 10. Third slide rail; 11. Anti-slip pad.

[0037] The accompanying drawings have illustrated specific embodiments of the present invention, which will be described in more detail below. These drawings and descriptions are not intended to limit the scope of the present invention in any way, but rather to illustrate the concept of the present invention to those skilled in the art through reference to specific embodiments. Detailed Implementation

[0038] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present utility model.

[0039] Before further describing the embodiments of this utility model in detail, the directional terms involved in the embodiments of this utility model, such as "upper part," "lower part," and "side part," are used to refer to... Figure 1 The orientation shown is a reference and does not limit the scope of protection of this utility model.

[0040] To make the technical solution and advantages of this utility model clearer, the embodiments of this utility model will be described in further detail below with reference to the accompanying drawings.

[0041] like Figure 1 , Figure 2 As shown, a steering gear fixing device includes: a clamping part 3, a first clamping part 4, and a second clamping part 5; the first clamping part 4 is disposed on a fixing carrier 1, and the second clamping part 5 is slidably connected to the fixing carrier 1, and the first clamping part 4 and the second clamping part 5 can rotate circumferentially around their own axes; the clamping part 3 and the fixing carrier 1 are connected by a connecting structure 2, the clamping part 3 and the fixing carrier 1 are disposed opposite to each other, the first clamping part 4 and the second clamping part 5 are disposed on the side of the fixing carrier 1 facing the clamping part 3, and the distance between the clamping part 3 and the fixing carrier 1 is adjustable.

[0042] Through the above technical solution, this application achieves reliable fixing of various types of column steering gears, effectively solving the clamping problem caused by the difference in the distance between the two ends and the bending structure. The circumferential rotation characteristic of the clamping part eliminates the angular deviation during the installation of the steering gear. The sliding connection between the second clamping part 5 and the fixed carrier 1 makes the distance between the first clamping part 4 and the second clamping part 5 adjustable, simplifying the size adjustment operation. The adjustable distance design between the pressing part 3 and the fixed carrier 1 is compatible with steering gear bodies of different diameters. This device significantly improves the installation efficiency of the steering gear and avoids workpiece damage caused by improper clamping.

[0043] Furthermore, the fixed carrier 1, as the main structure, is a base on which clamping components are installed, providing stable support for the clamping components and possessing sufficient stability. Specifically, the fixed carrier 1 is a base plate.

[0044] Furthermore, the steering gear body is positioned between the fixed carrier 1 and the clamping part 3. The clamping part 3 is a component capable of applying vertical pressure. By adjusting the distance between the clamping part 3 and the fixed carrier 1, a clamping force can be formed on the steering gear body. The clamping part 3 and the fixed carrier 1 are connected by the connecting structure 2, and the clamping part 3 and the fixed carrier 1 are positioned opposite each other.

[0045] Furthermore, the first clamping part 4 refers to a clamping component with a fixed installation position, which can be implemented by an arc plate structure with a rotating shaft, and is used to fix the steering gear.

[0046] Furthermore, the second clamping part 5 refers to a movable clamping component, which can be implemented by a slider and slide rail cooperation structure. The distance between the first clamping part 4 and the second clamping part 5 is adjustable to adapt to different steering gear lengths.

[0047] Furthermore, the first clamping part 4 and the second clamping part 5 can circumferentially rotate around their own axes so that the clamping surfaces can automatically adjust their angles according to the shape of the steering gear.

[0048] Furthermore, the connecting structure 2 refers to the mechanism for adjusting the distance between the pressing part 3 and the fixed carrier 1. Specifically, multiple columns of the same size and dimensions can be used to connect the fixed carrier 1 and 302.

[0049] like Figure 2 As shown, the first clamping part 4 includes a first bracket 401, a first rotating shaft 402 and a first clamping seat 403; the first bracket 401 is provided on the fixed carrier 1, and the first clamping seat 403 is rotatably connected to the first bracket 401 through the first rotating shaft 402.

[0050] By providing a first clamping part 4 on the fixed carrier 1, the steering gear can be fixed in the fixed carrier 1.

[0051] Furthermore, the first bracket 401 refers to a rigid support component used to support the clamping structure. Specifically, it can be formed by welding or casting metal plates and is used to stably fix the clamping seat on the fixed carrier 1.

[0052] Furthermore, the first rotating shaft 402 refers to the structure that realizes rotational motion, used to connect the first support 401 and the first clamping seat 403 and provide rotational freedom.

[0053] Furthermore, the first clamping seat 403 refers to the clamping component that directly contacts the steering gear. Specifically, it can be implemented using a metal seat with an arc-shaped contact surface, which is used to adjust the clamping angle according to the shape of the steering gear to achieve a tight fit.

[0054] like Figure 1 As shown, the second clamping part 5 includes a second bracket, a second rotating shaft, and a second clamping seat; the fixed carrier 1 is provided with a first slide rail 6, the second bracket and the first slide rail 6 are slidably connected, and the second clamping seat is rotatably connected to the second bracket through the second rotating shaft.

[0055] The distance between the second clamping part 5 and the first clamping part 4 can be changed by sliding the second bracket horizontally along the first slide rail 6. In other words, when the length of the steering gear body changes, the clamping point can be accurately aligned by adjusting the sliding position.

[0056] Furthermore, the second bracket refers to the load-bearing component that cooperates with the slide rail. Specifically, it can be a bracket with a slider structure, where the slider at the bottom cooperates with the groove of the first slide rail 6, and the distance between the first clamping part 4 and the second clamping part 5 can be adjusted through sliding connection.

[0057] Furthermore, the second rotating shaft refers to the structure that enables the clamping seat to rotate. Specifically, it can be implemented using a cylindrical metal rod with bearings, and the axis of this rotating shaft is perpendicular to the sliding direction.

[0058] Furthermore, the second clamping seat refers to the clamping component that directly contacts the steering gear. Specifically, it can be implemented using a metal seat with an arc-shaped contact surface, which is used to adjust the clamping angle according to the shape of the steering gear to achieve a tight fit.

[0059] like Figure 1 As shown, the clamping part 3 includes a support plate 302, a driving structure 301, and a clamping plate 303; the support plate 302 and the fixed carrier 1 are connected by the connecting structure 2; the driving structure 301 is disposed on the support plate 302, and the clamping plate 303 is disposed at the driving end of the driving structure 301; the support plate 302, the clamping plate 303, and the fixed carrier 1 are arranged in parallel, and the clamping plate 303 is disposed between the support plate 302 and the fixed carrier 1; the driving structure 301 drives the clamping plate 303 to move away from or towards the fixed carrier 1.

[0060] Through the above technical solution, this application realizes that the pressure plate 303 can be adjusted up and down by the drive structure 301 and the support plate 302. This solution allows the space between the pressure plate 303 and the fixed carrier 1 to be adjusted adaptively according to the diameter of the steering gear.

[0061] Furthermore, the support plate 302 refers to the component that is connected to the fixed carrier 1 through the connecting structure 2, and the connecting structure 2 maintains the relative positional stability with respect to the fixed carrier 1.

[0062] Furthermore, the drive structure 301 refers to a telescopic rod or electric actuator, which controls the movement of the pressure plate 303 through the drive end.

[0063] Furthermore, the clamping plate 303 refers to the clamping component that contacts the steering gear. Its function is to form a clamping space through its cooperation with the fixed carrier 1, and to adjust the height of the clamping space under the control of the drive structure 301.

[0064] like Figure 3 As shown, the steering gear fixing device further includes a third clamping part 7 and a fourth clamping part 9; the third clamping part 7 and the fourth clamping part 9 are disposed on the side of the pressure plate 303 facing the fixing carrier 1; the third clamping part 7 and the fourth clamping part 9 can rotate circumferentially around their own axis.

[0065] Through the above technical solution, this application achieves the function of further fixing the steering gear. The original setting of the first clamping part 4 and the second clamping part 5 on the fixing carrier 1 can fix the lower part of the steering gear through two points. Now, with the third clamping part 7 and the fourth clamping part 9 set on the pressure plate 303, the steering gear can be fixed through four points, so that the steering gear can be more securely fixed in the mounting device.

[0066] Furthermore, the third clamping part 7 and the fourth clamping part 9 are disposed on the side of the pressure plate 303 facing the fixed carrier 1, and the third clamping part 7 and the fourth clamping part 9 are arranged parallel to each other along the length direction of the pressure plate 303.

[0067] Furthermore, the third clamping part 7 and the fourth clamping part 9 achieve rotation of the clamping seat around its own axis via a rotating shaft.

[0068] like Figure 3 As shown, the clamping plate 303 is provided with a second slide rail 8 and a third slide rail 10;

[0069] The third clamping part 7 is slidably connected to the second slide rail 8 and the pressure plate 303; the fourth clamping part 9 is slidably connected to the third slide rail and the pressure plate 303.

[0070] Through the above technical solution, this application realizes that the third bracket can change the position of the third clamping part 7 by sliding horizontally along the second slide rail 8, and the fourth bracket can change the position of the fourth clamping part 9 by sliding horizontally along the third slide rail 10, so that the positions of the third clamping part 7 and the fourth clamping part 9 can be adjusted according to the length of the steering body, and the clamping point can be accurately aligned by adjusting the sliding position.

[0071] Furthermore, a second slide rail 8 and a third slide rail 10 are provided on the side of the clamping plate 303 facing the fixed carrier 1, and the second slide rail 8 and the third slide rail 10 are arranged parallel to each other.

[0072] like Figure 3 As shown, the third clamping part 7 includes a third bracket, a third rotating shaft, and a third clamping seat; the third bracket and the second slide rail 8 are slidably connected, and the third clamping seat is rotatably connected to the third bracket through the third rotating shaft.

[0073] Through the above technical solution, this application realizes that when the steering gear is placed between the fixed carrier 1 and the pressure plate 303, when the third bracket slides laterally along the second slide rail 8, the third clamping seat moves to the position corresponding to the bent part of the steering gear. At this time, the third clamping seat rotates freely around the axis due to the third rotating shaft. When the pressure plate 303 applies downward pressure, the arc surface of the third clamping seat automatically adjusts the angle to closely fit the curved contour of the steering gear. The synergistic effect of the sliding connection and the rotating connection enables the horizontal adjustment of the clamping position and the adaptive adjustment of the clamping angle to be completed simultaneously without the need for repeated manual calibration.

[0074] Furthermore, the third bracket refers to the support component that carries the clamping seat and realizes lateral displacement. Specifically, it can be a structure with a slider, the slider at the bottom of which cooperates with the groove of the second slide rail 8.

[0075] Furthermore, the third rotating shaft refers to the structure that enables the clamping seat to rotate. The rotating shaft can be cylindrical in shape, with the upper end of the rotating shaft connected to the clamping seat and the lower end of the rotating shaft connected to the third support.

[0076] Furthermore, the third clamping seat is a support component that is mounted on the third bracket and directly contacts the steering gear.

[0077] Furthermore, the second slide rail 8 refers to the structure that guides the third support to move in parallel.

[0078] like Figure 3 As shown, the fourth clamping part 9 includes a fourth bracket, a fourth rotating shaft, and a fourth clamping seat; the fourth bracket and the third slide rail 10 are slidably connected, and the fourth clamping seat is rotatably connected to the fourth bracket through the fourth rotating shaft.

[0079] Through the above technical solution, this application realizes that when the fourth bracket moves laterally along the third slide rail, it drives the fourth clamping seat to adjust its position in the plane of the pressure plate 303, so as to adapt to the installation requirements of different bending parts of the steering gear. The fourth rotating shaft allows the fourth clamping seat to rotate freely around its axis. When the steering gear has asymmetrical bending, the clamping seat can automatically adjust the contact angle so that the arc plate surface always maintains surface contact with the outer contour of the steering gear.

[0080] Furthermore, the fourth bracket refers to the support component that carries the clamping seat and realizes lateral displacement. Specifically, it can be a structure with a slider, the slider at the bottom of which cooperates with the groove of the third slide rail 10.

[0081] Furthermore, the fourth rotating shaft refers to the structure that enables the clamping seat to rotate. The rotating shaft can be cylindrical in shape, with the upper end connected to the clamping seat and the lower end connected to the fourth bracket.

[0082] Furthermore, the fourth clamp is a support component that is mounted on the fourth bracket and directly contacts the steering gear.

[0083] Furthermore, the third slide rail 9 refers to the structure that guides the fourth support to move in parallel.

[0084] like Figure 1 As shown, the rotation axes of the first clamping part 4, the second clamping part 5, the third clamping part 7, and the fourth clamping part 9 are located in the same plane.

[0085] It should be noted that the rotation axes of the four clamping parts are located in the same plane. These axes are usually parallel to each other, but they do not necessarily have to be parallel, as long as they are in the same plane. For example, axes that intersect at one point are also coplanar. That is to say, the rotation axis of the first clamping part 4 is horizontally parallel to the rotation axis of the second clamping part 5, and the rotation axis of the first clamping part 4 is longitudinally parallel to the rotation axis of the third clamping part 7. The same applies to other axes. In other words, the clamping parts are mainly confined to two-dimensional space. When the steering gear has a bent section, the first clamping part 4 and the second clamping part 5 rotate around the axis on the side of the fixed carrier 1, and the third clamping part 7 and the fourth clamping part 9 rotate around the axis on the side of the pressure plate 303. The four sets of rotation trajectories intersect in the reference plane. During the clamping process, each clamping seat adjusts the clamping angle by rotating around the axis, so that the curved plate surface of the four sets of clamping seats always keeps in contact with the outer contour of the steering gear.

[0086] like Figure 1-3 As shown, the first clamping seat 403 of the first clamping part 4, the second clamping seat of the second clamping part 5, the third clamping seat of the third clamping part 7, and the fourth clamping seat of the fourth clamping part 9 are all arc-shaped plates.

[0087] The first clamping seat 403, the second clamping seat, the third clamping seat, and the fourth clamping seat are all arc-shaped plates, which can increase the contact area between the clamping seat and the steering gear to fix and support the steering gear.

[0088] In addition, anti-slip pads are attached to the curved plate of the clamping seat. When the steering gear contacts the clamping seat, the anti-slip pads can play a protective role in preventing slipping and wear.

[0089] In this invention, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. The term "multiple" refers to two or more unless otherwise expressly defined.

[0090] Other embodiments of the present invention will readily occur to those skilled in the art upon consideration of the specification and practice of the invention disclosed herein. The present invention is intended to cover any variations, uses, or adaptations of the invention that follow the general principles of the invention and include common knowledge or customary techniques in the art not disclosed herein. The specification and examples are to be considered exemplary only.

[0091] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A steering gear fixing and mounting device, characterized in that, include: The clamping part (3), the first clamping part (4), and the second clamping part (5); The first clamping part (4) is disposed on the fixed carrier (1), and the second clamping part (5) is slidably connected to the fixed carrier (1). The first clamping part (4) and the second clamping part (5) can rotate circumferentially around their own axes. The pressing part (3) and the fixing carrier (1) are connected by a connecting structure (2). The pressing part (3) and the fixing carrier (1) are arranged opposite to each other. The first clamping part (4) and the second clamping part (5) are arranged on the side of the fixing carrier (1) facing the pressing part (3). The distance between the pressing part (3) and the fixing carrier (1) is adjustable.

2. The steering gear fixing device according to claim 1, characterized in that, The first clamping part (4) includes a first bracket (401), a first rotating shaft (402), and a first clamping seat (403); The first bracket (401) is provided on the fixed carrier (1), and the first clamping seat (403) is rotatably connected to the first bracket (401) through the first rotating shaft (402).

3. The steering gear fixing device according to claim 1, characterized in that, The second clamping part (5) includes a second bracket, a second rotating shaft, and a second clamping seat; The fixed carrier (1) is provided with a first slide rail (6), the second bracket and the first slide rail (6) are slidably connected, and the second clamping seat is rotatably connected to the second bracket through the second rotating shaft.

4. The steering gear fixing device according to claim 1, characterized in that, The pressing part (3) includes a support plate (302), a driving structure (301), and a pressing plate (303); The support plate (302) and the fixed carrier (1) are connected by the connecting structure (2); The driving structure (301) is disposed on the support plate (302), and the clamping plate (303) is disposed on the driving end of the driving structure (301); The support plate (302), the clamping plate (303) and the fixed carrier (1) are arranged in parallel. The clamping plate (303) is disposed between the support plate (302) and the fixed carrier (1). The driving structure (301) drives the clamping plate (303) to move away from or closer to the fixed carrier (1).

5. The steering gear fixing device according to claim 4, characterized in that, The steering gear fixing device also includes a third clamping part (7) and a fourth clamping part (9); The third clamping part (7) and the fourth clamping part (9) are disposed on the side of the clamping plate (303) facing the fixed carrier (1); The third clamping part (7) and the fourth clamping part (9) can rotate circumferentially around their own axis.

6. The steering gear fixing device according to claim 5, characterized in that, The clamping plate (303) is provided with a second slide rail (8) and a third slide rail; The third clamping part (7) is slidably connected to the second slide rail (8) and the clamping plate (303); The fourth clamping part is slidably connected to the third slide rail and the pressure plate (303).

7. The steering gear fixing device according to claim 6, characterized in that, The third clamping part (7) includes a third bracket, a third rotating shaft, and a third clamping seat; The third bracket and the second slide rail (8) are slidably connected, and the third clamping seat is rotatably connected to the third bracket through the third rotating shaft.

8. The steering gear fixing device according to claim 6, characterized in that, The fourth clamping part (9) includes a fourth bracket, a fourth rotating shaft, and a fourth clamping seat; The fourth bracket and the third slide rail (10) are slidably connected, and the fourth clamping seat is rotatably connected to the fourth bracket through the fourth rotating shaft.

9. The steering gear fixing device according to claim 5, characterized in that, The rotation axis of the first clamping part (4), the rotation axis of the second clamping part (5), the rotation axis of the third clamping part (7), and the rotation axis of the fourth clamping part (9) are located in the same plane.

10. The steering gear fixing device according to claim 9, characterized in that, The first clamping seat (403) of the first clamping part (4), the second clamping seat of the second clamping part (5), the third clamping seat of the third clamping part (7) and the fourth clamping seat of the fourth clamping part are all arc-shaped plates.

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