Device for assembling automobile

Abstract

The utility model relates to the technical field of automobile production, in particular to a device for automobile assembly. Comprising a base; the first clamping mechanism comprises a first base, a first clamping arm and a second clamping arm, and the first base can move relative to the machine base; the second clamping mechanism comprises a second base, a third clamping arm and a fourth clamping arm, the second base can move relative to the machine base, and the third clamping arm and the fourth clamping arm are movably arranged on the second base; the first driving mechanism is used for driving the first base and the second base to move synchronously and is mechanically centered in the length direction of the machine base; the second driving mechanism is used for driving the first clamping arm and the second clamping arm to move synchronously and mechanically centering in the width direction of the machine base; and the third driving mechanism is used for driving the third clamping arm and the fourth clamping arm to move synchronously and mechanically centering in the width direction of the machine base. The device for automobile assembly can achieve automatic adjustment and is good in welding effect.

Description

Technical Field

[0001] This application relates to the technical field of automobile production, and particularly to a device for automobile assembly. Background Art

[0002] In the process of automobile production and processing, many components need to be welded, usually achieved through a welding and assembly device. The traditional welding and assembly device manually holds and clamps the workpiece, aligns the gaps and then welds. During this process, it is easy to have the situation that the manual holding and alignment are unstable, and the welding quality is poor. The welding efficiency is not high, and it is not convenient to temporarily adjust the height and welding distance of automobile parts. Utility Model Content

[0003] Based on this, it is necessary to provide a device for automobile assembly that can achieve automatic adjustment and has good welding effect.

[0004] A device for automobile assembly, comprising:

[0005] A base;

[0006] A first clamping mechanism, including a first base, a first clamping arm, and a second clamping arm. The first base can move relative to the base, and the first clamping arm and the second clamping arm are respectively movably arranged on the first base;

[0007] A second clamping mechanism, including a second base, a third clamping arm, and a fourth clamping arm. The second base can move relative to the base, and the third clamping arm and the fourth clamping arm are respectively movably arranged on the second base;

[0008] A first driving mechanism for driving the first base and the second base to move synchronously and mechanically aligning them along the length direction of the base;

[0009] A second driving mechanism for driving the first clamping arm and the second clamping arm to move synchronously and mechanically aligning them along the width direction of the base;

[0010] A third driving mechanism for driving the third clamping arm and the fourth clamping arm to move synchronously and mechanically aligning them along the width direction of the base.

[0011] In one embodiment, the first driving mechanism includes a first rotating rod, a first driving member, and a first transmission component. The first driving member is connected to the first rotating rod, and the first transmission component is used for the transmission connection between the first rotating rod and the first base and the second base, transmitting the rotation of the first rotating rod into the synchronous movement of the first base and the second base.

[0012] In one embodiment, the transmission component includes a first threaded section, a second threaded section, and a first guide rail. The first threaded section and the second threaded section are provided on the first rotating rod and are arranged with opposite thread directions; the first base is in threaded engagement with the first threaded section, and the second base is in threaded engagement with the second threaded section; the first guide rail is provided on the machine base for guiding the movement of the first base and the second base.

[0013] In one embodiment, an installation frame is provided on the machine base, and the first base and the second base are arranged inside the installation frame; the first guide rail is provided on the installation frame and extends along the length direction of the installation frame.

[0014] In one embodiment, the second driving mechanism includes a second rotating rod, a third threaded section, a fourth threaded section, and a second driving member. The second driving member is connected to the second rotating rod. The third threaded section and the fourth threaded section are provided on the second rotating rod and are arranged with opposite thread directions; the first clamping arm is in threaded engagement with the third threaded section, and the second clamping arm is in threaded engagement with the fourth threaded section.

[0015] In one embodiment, a part of the second rotating rod is disposed inside the first guide rail and is in sliding fit with the first guide rail.

[0016] In one embodiment, the third driving mechanism includes a third rotating rod, a fifth threaded section, a sixth threaded section, and a third driving member. The third driving member is connected to the third rotating rod. The fifth threaded section and the sixth threaded section are provided on the third rotating rod and are arranged with opposite thread directions; the third clamping arm is in threaded engagement with the fifth threaded section, and the fourth clamping arm is in threaded engagement with the sixth threaded section.

[0017] In one embodiment, a part of the third rotating rod is disposed inside the first guide rail and is in sliding fit with the first guide rail.

[0018] In one embodiment, a lifting plate is provided on the first clamping arm, and the lifting plate can move up and down on the first clamping arm in the height direction; an adjusting screw and a guide rod are provided on the first clamping arm. The adjusting screw is connected to the lifting plate, and the guide rod is slidably connected to the lifting plate.

[0019] In one embodiment, a second guide rail that is respectively slidably connected to the first clamping arm and the second clamping arm is provided on the first base, and a first cleaning hole penetrating the first base is provided on the second guide rail; a third guide rail that is respectively slidably connected to the third clamping arm and the fourth clamping arm is provided on the second base, and a second cleaning hole penetrating the first base is provided on the third guide rail.

[0020] Compared with the prior art, three driving mechanisms are provided in the device for automobile assembly, which respectively drive the first base and the second base, the first clamping arm and the second clamping arm, and the third clamping arm and the third clamping arm to move, realizing automatic operation and clamping of workpieces. It has high efficiency, stable clamping, can be adjusted at any time, and has flexible operation. Secondly, the three driving mechanisms are independently adjusted, which can be applied to a variety of clamping conditions, adapt to different types of workpieces, and have a wide application range. Even special-shaped workpieces can be firmly clamped. Moreover, the driving mechanism can realize synchronous centering adjustment of the clamping arms, can perform centering processing on the workpiece while clamping, eliminating manual alignment of the workpiece, which not only saves time and effort, but also ensures the accuracy of the welding position. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained according to these drawings.

[0022] Figure 1 Structural schematic diagram of the device for automobile assembly provided by the present application.

[0023] Figure 2 Top view of the device for automobile assembly provided by the present application.

[0024] Figure 3 is Figure 1 Enlarged view of part A in

[0025] Figure 4 Structural schematic diagram of the first clamping arm provided by the present application.

[0026] Reference numerals: 10, machine base; 11, mounting frame; 20, first clamping mechanism; 21, first base; 22, first clamping arm; 23, second clamping arm; 30, second clamping mechanism; 31, second base; 32, third clamping arm; 33, fourth clamping arm; 40, first driving mechanism; 41, first rotating rod; 42, first driving member; 43, first transmission member; 431, first threaded section; 432, second threaded section; 433, first guide rail; 50, second driving mechanism; 51, second rotating rod; 52, third threaded section; 53, fourth threaded section; 54, second driving member; 60, third driving mechanism; 61, third rotating rod; 62, fifth threaded section; 63, sixth threaded section; 64, third driving member; 71, second guide rail; 72, first flange; 73, strip-shaped rail groove; 74, first cleaning hole; 75, third guide rail; 76, second flange; 77, strip-shaped track; 78, second cleaning hole; 81, lifting plate; 82, adjusting screw; 83, guide rod. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0027] To make the above objects, features, and advantages of the present application more obvious and understandable, the following will describe in detail the specific implementation manners of the present application with reference to the accompanying drawings. Many specific details are set forth in the following description to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without departing from the connotation of the present application. Therefore, the present application is not limited by the specific embodiments disclosed below.

[0028] It should be noted that when a component is referred to as being "fixed to" or "disposed on" another component, it can be directly on the other component or there can also be an intermediate component. When a component is considered to be "connected" to another component, it can be directly connected to the other component or there may be an intermediate component at the same time. The terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used in the specification of the present application are only for the purpose of illustration and do not represent the only implementation manner.

[0029] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one of such features. In the description of the present application, the meaning of "a plurality of" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0030] In the present application, unless otherwise clearly specified and limited, the first feature being "on" or "under" the second feature can be that the first feature is in direct contact with the second feature, or the first feature and the second feature are indirectly in contact through an intermediate medium. Moreover, the first feature being "above", "over" and "on top of" the second feature can be that the first feature is directly above or obliquely above the second feature, or only indicates that the first feature is at a higher horizontal height than the second feature. The first feature being "under", "beneath" and "underneath" the second feature can be that the first feature is directly below or obliquely below the second feature, or only indicates that the first feature is at a lower horizontal height than the second feature.

[0031] Unless otherwise defined, all technical and scientific terms used in the specification of the present application have the same meaning as commonly understood by those skilled in the technical field to which the present application belongs. The terms used in the specification of the present application are only for the purpose of describing specific implementation manners and are not intended to limit the present application. The term "and / or" used in the specification of the present application includes any and all combinations of one or more of the related listed items.

[0032] Please refer to Figures 1 to 4, this application provides a device for automobile assembly, including a machine base 10, a first clamping mechanism 20, a second clamping mechanism 30, a first driving mechanism 40, a second driving mechanism 50, and a third driving mechanism 60. The first clamping mechanism 20 and the second clamping mechanism 30 are both arranged on the machine base 10. Among them, the first clamping mechanism 20 includes a first base 21, a first clamping arm 22, and a second clamping arm 23. The first base 21 can move relative to the machine base 10, and the first clamping arm 22 and the second clamping arm 23 are respectively movably arranged on the first base 21. The second clamping mechanism 30 includes a second base 31, a third clamping arm 32, and a fourth clamping arm 33. The second base 31 can move relative to the machine base 10, and the third clamping arm 32 and the fourth clamping arm 33 are respectively movably arranged on the second base 31.

[0033] Among them, the first driving mechanism 40 is used to drive the first base 21 and the second base 31 to move synchronously and mechanically align along the length direction of the machine base 10. The second driving mechanism 50 is used to drive the first clamping arm 22 and the second clamping arm 23 to move synchronously and mechanically align along the width direction of the machine base 10. The third driving mechanism 60 is used to drive the third clamping arm 32 and the fourth clamping arm 33 to move synchronously and mechanically align along the width direction of the machine base 10.

[0034] Understandably, under the control of the three groups of driving mechanisms, the first clamping arm 22, the second clamping arm 23, the third clamping arm 32, and the fourth clamping arm 33 can move freely in both the length and width directions of the machine base 10, and then clamp the workpiece. There is no need for manual clamping, and the welding efficiency is high.

[0035] Understandably, all three driving mechanisms are for centering adjustment, and can perform centering processing on the workpiece while clamping, eliminating the need for manual alignment of the workpiece, which not only saves time and effort, but also ensures the accuracy of the welding position.

[0036] As Figure 2 shown, the first driving mechanism 40 includes a first rotating rod 41, a first driving member 42, and a first transmission member 43. The first driving member 42 is connected to the first rotating rod 41, and the first transmission member 43 is used for the transmission connection between the first rotating rod 41 and the first base 21 and the second base 31, and transmits the rotation of the first rotating rod 41 into the synchronous movement of the first base 21 and the second base 31.

[0037] Optionally, the first driving member 42 is set as a motor, and the output shaft of the motor is fixedly connected to the first rotating rod 41. Of course, it is not limited to this. The first driving member 42 can also be a gearbox, a worm and worm structure, etc., as long as it can drive the first rotating rod 41 to rotate.

[0038] Exemplarily, the transmission component includes a first threaded section 431, a second threaded section 432, and a first guide rail 433. Specifically, the first threaded section 431 and the second threaded section 432 are provided on the first rotating rod 41, and are arranged with opposite thread directions. The first base 21 is in threaded engagement with the first threaded section 431, and the second base 31 is in threaded engagement with the second threaded section 432.

[0039] It can be understood that the opposite thread directions here are for driving the first base 21 and the second base 31 to move in the direction of approaching each other when the first rotating rod 41 rotates. It can be a positive and negative thread setting to achieve a high degree of synchronization in driving the first base 21 and the second base 31, ensuring the centering clamping effect. And the transmission is achieved by means of threaded connection, with a simple structure, stable operation, and not prone to failure.

[0040] The first guide rail 433 is provided on the machine base 10 for guiding the movement of the first base 21 and the second base 31. It can be understood that the first guide rail 433 restricts the rotation of the first base 21 and the second base 31, ensuring that when the first rotating rod 41 rotates, the first base 21 and the second base 31 will move along the length direction of the first guide rail 433 to achieve stable displacement.

[0041] In this embodiment, an installation frame 11 is provided on the machine base 10, and the first base 21 and the second base 31 are arranged inside the installation frame 11. The first guide rail 433 is provided on the installation frame 11 and extends along the length direction of the installation frame 11.

[0042] As Figure 2 shown, the second driving mechanism 50 includes a second rotating rod 51, a third threaded section 52, a fourth threaded section 53, and a second driving member 54. Among them, the second driving member 54 is connected to the second rotating rod 51, the third threaded section 52 and the fourth threaded section 53 are provided on the second rotating rod 51, and are arranged with opposite thread directions. The first clamping arm 22 is in threaded engagement with the third threaded section 52, and the second clamping arm 23 is in threaded engagement with the fourth threaded section 53.

[0043] Optionally, the second driving member 54 is set as a motor, and the output shaft of the motor is fixedly connected to the second rotating rod 51. Of course, it is not limited to this. The second driving member 54 can also be a gearbox, a worm and worm structure, etc., as long as it can drive the second rotating rod 51 to rotate.

[0044] It can be understood that the opposite thread directions here are for driving the first clamping arm 22 and the second clamping arm 23 to move in the direction of approaching each other when the second rotating rod 51 rotates. It can be a positive and negative thread setting to achieve a high degree of synchronization in driving the first clamping arm 22 and the second clamping arm 23, ensuring the centering clamping effect. And the transmission is achieved by means of threaded connection, with a simple structure, stable operation, and not prone to failure.

[0045] As Figure 2As shown, the third driving mechanism 60 includes a third rotating rod 61, a fifth thread segment 62, a sixth thread segment 63, and a third driving member 64. The third driving member 64 is connected to the third rotating rod 61, and the fifth thread segment 62 and the sixth thread segment 63 are arranged on the third rotating rod 61, and the thread directions are opposite. The third clamping arm 32 is threadedly matched with the fifth thread segment 62, and the fourth clamping arm 33 is threadedly matched with the sixth thread segment 63.

[0046] Optionally, the third driving member 64 is configured as a motor, and the output shaft of the motor is fixedly connected to the third rotating rod 61. Of course, it is not limited thereto, and the third driving member 64 may also be a gear box, a worm gear structure, etc., as long as it can drive the third rotating rod 61 to rotate.

[0047] It can be understood that the opposite direction of the screw here is to drive the third clamping arm 32 and the fourth clamping arm 33 to move towards each other when the third rotating rod 61 rotates. It can be a positive and negative thread setting to achieve a high degree of synchronization of the driving of the third clamping arm 32 and the fourth clamping arm 33 to ensure the centering clamping effect. And the transmission is realized by screw connection, which has a simple structure, stable operation and is not prone to failure.

[0048] In this embodiment, the first guide rails 433 are provided in two groups, which are respectively provided on the corresponding two side walls of the fixed frame. The end of the second rotating rod 51 away from the second driving member 54 penetrates into the first guide rail 433 on this side and slides with the first guide rail 433. The second driving member 54 penetrates into the first guide rail 433 on the opposite side and slides with the first guide rail 433. The two-end positioning connection method is adopted to achieve stable guidance of the first base 21 and ensure the smooth movement of the first base 21.

[0049] In this embodiment, the end of the third rotating rod 61 away from the third driving member 64 penetrates into the first guide rail 433 on this side and slides with the third guide rail 75. The third driving member 64 penetrates into the first guide rail 433 on the opposite side and slides with the first guide rail 433. The two-end positioning connection method is adopted to achieve stable guidance of the second base 31 and ensure the smooth movement of the second base 31.

[0050] Furthermore, the first base 21 is provided with a second guide rail 71, and the first clamp arm 22 and the second clamp arm 23 are respectively slidably connected to the second guide rail 71. Specifically, the second guide rail 71 is a strip groove opened along the length direction of the first base 21, and the lower parts of the first clamp arm 22 and the second clamp arm 23 penetrate into the strip groove and slide in cooperation with the strip groove. The second rotating rod 51 crosses the entire first base 21 along the length direction, so part of the second rotating rod 51 is in the strip groove, and the lower parts of the first clamp arm 22 and the second clamp arm 23 penetrate into the strip groove and are screwed to the threaded section on the second rotating rod 51.

[0051] Preferably, the first clamp arm 22 and the second clamp arm 23 are respectively provided with a first flange 72 at their lower parts, and a bar-shaped rail groove 73 is provided on the side wall of the bar-shaped groove, and the first flange 72 is inserted into the bar-shaped rail groove 73 and can slide relatively. Through the cooperation between the first flange 72 and the bar-shaped rail groove 73, the first clamp arm 22 and the second clamp arm 23 are further guided when moving to avoid jamming.

[0052] Optionally, a first cleaning hole 74 penetrating the first base 21 is provided at a position corresponding to the bottom of the second guide rail 71, so that debris generated during welding can fall through the cleaning hole and will not accumulate in the second guide rail 71, thereby preventing the first clamp arm 22 and the second clamp arm 23 from being unable to move.

[0053] Furthermore, a third guide rail 75 is provided on the second base 31 , and the third clamping arm 32 and the fourth clamping arm 33 are slidably connected to the third guide rail 75 , respectively.

[0054] Specifically, the third guide rail 75 is a strip groove opened along the length direction of the second base 31, and the lower parts of the third clamp arm 32 and the fourth clamp arm 33 penetrate into the strip groove and slide in cooperation with the strip groove. The third rotating rod 61 crosses the entire second base 31 along the length direction, so part of the third rotating rod 61 is in the strip groove, and the lower parts of the third clamp arm 32 and the fourth clamp arm 33 penetrate into the strip groove and are screwed to the threaded section on the third rotating rod 61.

[0055] Preferably, the lower part of the third clamp arm 32 and the fourth clamp arm 33 are respectively provided with a second flange 76, and the side wall of the strip groove is provided with a strip track 77, and the second flange 76 is inserted into the strip track 77 and can slide relatively. Through the cooperation of the second flange 76 and the strip track 77, the third clamp arm 32 and the fourth clamp arm 33 are further guided when moving to avoid jamming.

[0056] Optionally, a second cleaning hole 78 penetrating the second base 31 is provided at a position corresponding to the bottom of the third guide rail 75, so that debris generated during welding can fall through the cleaning hole and will not accumulate in the third guide rail 75, thereby preventing the third clamp arm 32 and the fourth clamp arm 33 from being unable to move.

[0057] like Figure 3 , Figure 4 As shown, the first clamping arm 22 is provided with a lifting plate 81, which can move up and down along the height direction on the first clamping arm 22. The first clamping arm 22 is provided with an adjusting screw 82 and a guide rod 83, the adjusting screw 82 is connected to the lifting plate 81, and the guide rod 83 is slidably connected to the lifting plate 81.

[0058] Understandably, the adjusting screw 82 is screwed to the lifting plate 81, and the guide rod 83 restricts the lifting plate 81 from rotating when the adjusting screw 82 rotates, but moves up and down along the guide rod 83. By rotating the adjusting screw 82, the position of the lifting plate 81 can be adjusted. The lifting plate 81 can cooperate with the clamping arms to clamp workpieces of different thicknesses and sizes, with a wide range of applications, and the adjustment operation is simple, time-saving and labor-saving.

[0059] Furthermore, the structures of the second clamping arm 23, the third clamping arm 32, and the fourth clamping arm 33 are all set to be the same as that of the first clamping arm 22, so no further description will be given.

[0060] The technical features of the above-described embodiments can be combined arbitrarily. For the sake of concise description, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, it should be considered as the scope described in this specification.

[0061] The above-described embodiments only represent several implementation manners of the present application. The description is relatively specific and detailed, but it should not be construed as a limitation on the scope of the patent application. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present application, several modifications and improvements can still be made, and these all belong to the protection scope of the present application. Therefore, the patent protection scope of the present application should be subject to the appended claims.

Claims

1. A device for automobile assembly, characterized in that: include: A machine base (10); A first clamping mechanism (20) comprises a first base (21), a first clamping arm (22), and a second clamping arm (23); the first base (21) is movable relative to the machine base (10); the first clamping arm (22) and the second clamping arm (23) are respectively movably arranged on the first base (21); The second clamping mechanism (30) comprises a second base (31), a third clamping arm (32) and a fourth clamping arm (33), wherein the second base (31) is movable relative to the machine base (10), and the third clamping arm (32) and the fourth clamping arm (33) are respectively movably arranged on the second base (31); A first driving mechanism (40) is used to drive the first base (21) and the second base (31) to move synchronously and to mechanically align them along the length direction of the machine base (10); A second driving mechanism (50) is used to drive the first clamping arm (22) and the second clamping arm (23) to move synchronously and to mechanically align them along the width direction of the machine base (10); The third driving mechanism (60) is used to drive the third clamping arm (32) and the fourth clamping arm (33) to move synchronously and to mechanically align them along the width direction of the machine base (10).

2. The vehicle assembly device according to claim 1, characterized in that: The first driving mechanism (40) comprises a first rotating rod (41), a first driving member (42) and a first transmission member (43); the first driving member (42) is connected to the first rotating rod (41); the first transmission member (43) is used for transmission connection between the first rotating rod (41) and the first base (21) and the second base (31), so as to transmit the rotation of the first rotating rod (41) into synchronous movement of the first base (21) and the second base (31).

3. The vehicle assembly device according to claim 2, characterized in that: The transmission component comprises a first thread segment (431), a second thread segment (432), and a first guide rail (433); the first thread segment (431) and the second thread segment (432) are arranged on the first rotating rod (41) and are arranged in opposite directions; the first base (21) is threadedly matched with the first thread segment (431), and the second base (31) is threadedly matched with the second thread segment (432); the first guide rail (433) is arranged on the machine base (10) and is used for guiding the movement of the first base (21) and the second base (31).

4. The vehicle assembly device according to claim 3, characterized in that: A mounting frame (11) is provided on the machine base (10), and the first base (21) and the second base (31) are arranged in the mounting frame (11); the first guide rail (433) is arranged on the mounting frame (11) and extends along the length direction of the mounting frame (11).

5. The vehicle assembly device according to claim 3, characterized in that: The second driving mechanism (50) comprises a second rotating rod (51), a third thread segment (52), a fourth thread segment (53), and a second driving member (54); the second driving member (54) is connected to the second rotating rod (51); the third thread segment (52) and the fourth thread segment (53) are arranged on the second rotating rod (51) and are arranged in opposite directions; the first clamping arm (22) is threadedly matched with the third thread segment (52); the second clamping arm (23) is threadedly matched with the fourth thread segment (53).

6. The vehicle assembly device according to claim 5, characterized in that: The second rotating rod (51) is partially inserted into the first guide rail (433) and is slidably matched with the first guide rail (433).

7. The vehicle assembly device according to claim 3, characterized in that: The third driving mechanism (60) comprises a third rotating rod (61), a fifth thread segment (62), a sixth thread segment (63), and a third driving member (64); the third driving member (64) is connected to the third rotating rod (61); the fifth thread segment (62) and the sixth thread segment (63) are arranged on the third rotating rod (61) and are arranged in opposite directions; the third clamping arm (32) is threadedly matched with the fifth thread segment (62); and the fourth clamping arm (33) is threadedly matched with the sixth thread segment (63).

8. The vehicle assembly device according to claim 7, characterized in that: The third rotating rod (61) is partially inserted into the first guide rail (433) and is slidably matched with the first guide rail (433).

9. The vehicle assembly device according to claim 1, characterized in that: The first clamping arm (22) is provided with a lifting plate (81), and the lifting plate (81) can move up and down on the first clamping arm (22) along the height direction; the first clamping arm (22) is provided with an adjusting screw (82) and a guide rod (83), the adjusting screw (82) is connected to the lifting plate (81), and the guide rod (83) is slidably connected to the lifting plate (81).

10. The vehicle assembly device according to claim 1, characterized in that: The first base (21) is provided with a second guide rail (71) which is slidably connected to the first clamp arm (22) and the second clamp arm (23) respectively, and the second guide rail (71) is provided with a first cleaning hole (74) which passes through the first base (21); the second base (31) is provided with a third guide rail (75) which is slidably connected to the third clamp arm (32) and the fourth clamp arm (33) respectively, and the third guide rail (75) is provided with a second cleaning hole (78) which passes through the first base (21).

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