Box cover with clamping device

Abstract

The box cover with the clamping device comprises a cover body and a clamping assembly, the clamping assembly comprises arm bodies, the rear sections of the arm bodies are rotationally connected with the bottom face of the cover body, the box cover further comprises a holding piece, the arm bodies comprise the first arm body and the second arm body, the first arm body is hinged to the second arm body, and the holding piece is rotationally connected with the cover body. A first swing area and a second swing area are arranged on the two sides of the bending rotation area of the cover body respectively, and when the clamping assembly is used, the first arm body and the second arm body rotate relatively, and the first swing area and the second swing area rotate towards the top face of the cover body respectively, so that the front section of the first arm body and the front section of the second arm body are clamped. When the box cover is used, a user applies acting force to the cover body, the first arm body and the second arm body rotate relatively to get close, meanwhile, the rear section, facing the first arm body, of the cover body and the rear section, facing the second arm body, of the cover body are elastically deformed, and therefore the length of the box cover in use is reduced, and use convenience of the user is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of storage devices, in particular to a box cover with a clamping device. Background Art

[0002] In a storage box with an integrated clamping cover, the box cover is provided with a clamping assembly for clamping. The user applies a force to the box cover to deform the box cover made of silica gel material, and then drives the clamping assembly of the box cover to clamp the items in the storage box. The clamping assembly is assembled on the side of the box cover facing the opening of the box body. The clamping assembly includes two groups of clamping arms and two groups of clamping heads. One group of clamping arms is connected to one group of clamping heads, and the two groups of clamping arms are hinged. When using the clamping assembly, the user pinches the box cover to make it elastically deform, and then drives the clamping assembly to clamp the items. The areas on both sides of the elastic deformation area rotate towards the bottom surface of the box cover, causing the box cover to be distorted. This way of deforming outwards is usually applicable to storage boxes with a relatively small volume. For storage boxes with a relatively large volume and a relatively large opening size, the size of the box cover is also large. If the user drives the clamping assembly by pinching the box cover, the large box cover deforms towards the outside of the clamping arm, which will increase the difficulty for the user to pinch the box cover to drive the clamping assembly due to its large size, and reduce the convenience for the user to clamp the items. Summary of the Utility Model

[0003] The technical problem to be solved by the embodiment of the utility model is that in a large-sized storage box with an integrated clamping cover, the size of the clamping assembly is also large, resulting in great difficulty for the user to use the clamping assembly.

[0004] To solve the above technical problem, the embodiment of the utility model provides a box cover with a clamping device, which includes a cover body and a clamping assembly. The clamping assembly includes an arm body, the rear section of the arm body is rotatably connected to the bottom surface of the cover body, and further includes a holding member. The arm body includes a first arm body and a second arm body, the first arm body is hinged to the second arm body, the holding member is rotatably connected to the cover body. The two sides of the bending and rotating area of the cover body are respectively a first swinging area and a second swinging area. When the clamping assembly is in the use state, the first arm body and the second arm body rotate relative to each other, and the first swinging area and the second swinging area respectively rotate towards the top surface of the cover body, so that the front sections of the first arm body and the second arm body are clamped together, and the cover body forms a bending state.

[0005] Wherein, a slideway is fixedly arranged on the first arm body, a slide block is fixedly arranged on the second arm body, the slide block is rotatably connected to the slideway, the slideway extends along the direction from the front section to the rear section of the arm body, and the slide block slides back and forth on the slideway.

[0006] Wherein, when the clamping assembly is in the unused state, the first arm body and the second arm body are placed along the diagonal direction of the cover body.

[0007] Wherein, the holding piece includes a first link and a second link elastically connected to the first link, the first link and the second link are both rotatably connected to the cover body, and the first link and the second link respectively rotate in contact with two adjacent sides of the cover body.

[0008] Wherein, the holding piece is further provided with an elastic strip, one end of the elastic strip is fixedly connected to the first connecting strip, and the other end of the elastic strip is fixedly connected to the second connecting strip.

[0009] Among them, the first link and the second link are both hollow, and fixing strips are fixed on the inner sides of the first link and the second link. The elastic strip is a rubber ring, and the rubber ring is sleeved on the fixing strip. The rubber ring is connected between the first link and the second link through the fixing strip.

[0010] Wherein, the clamping assembly includes a clamping head, and the clamping head is connected to the arm body.

[0011] Wherein, the chuck includes a first chuck and a second chuck, the first chuck is folded and connected to the front section of the first arm body, and the second chuck is folded and connected to the front section of the second arm body. When the clamping assembly is not in use, the chuck rotates toward the arm body to form a compact storage state.

[0012] Among them, the outer wall of the arm body is provided with a slot, and the side of the clamp facing the arm body is provided with a buckle. The slot rotates back and forth toward the slot, and when the clamping assembly is in a compact storage state, the slot is engaged and connected with the buckle.

[0013] Wherein, when the clamping assembly is not in use, the first clamp and the first arm body are engaged and connected via the clamping groove and the buckle, and the second clamp is located between the first clamp and the first arm body.

[0014] The implementation of the embodiments of the utility model has the following beneficial effects: through the above-mentioned arrangement, when the clamping assembly is in use, the user applies a force to the cover body, and the first arm body and the second arm body rotate relative to each other and approach each other, and at the same time, the cover body is elastically deformed between the rear section of the first arm body and the rear section of the second arm body, thereby reducing the length of the box cover during use and improving the convenience of use for the user; by providing a slider and a slideway, when the user uses the clamping assembly, the slider slides along the slideway toward the direction close to the clamp head, thereby increasing the space between the rear section of the first arm body and the rear section of the second arm body for the deformed cover body, thereby improving the convenience of driving the clamping assembly. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1Schematic diagram of the lid of an existing storage box;

[0016] Figure 2 Isometric view of the first state of the present utility model;

[0017] Figure 3 Schematic structural diagram of the first state of the present utility model;

[0018] Figure 4 Isometric view of the second state of the present utility model;

[0019] Figure 5 Is Figure 4 Enlarged view of area A of

[0020] Figure 6 Schematic structural diagram of the second state of the present utility model;

[0021] Figure 7 Is Figure 6 Enlarged view of area B of

[0022] Figure 8 Isometric view of the third state of the present utility model;

[0023] Figure 9 Is Figure 8 Enlarged view of area C of

[0024] Figure 10 Isometric view of the fourth state of the present utility model;

[0025] Figure 11 Partial cross-sectional schematic diagram of the holding member of the present utility model.

[0026] In the figure: 1. Cover body; 2. Clamping assembly; 3. Chuck; 4. Arm body; 5. First arm body; 6. Second arm body; 7. First chuck; 8. Second chuck; 9. Slide block; 10. Slideway; 11. Buckle; 12. Card slot; 13. Holding member; 14. First connecting bar; 15. Second connecting bar; 16. Elastic strip; 17. Pivoting portion; 18. Engaging groove; 19. Connecting portion; 21. First rotating shaft member; 22. Second rotating shaft member; 23. Elastic deformation area; 24. Fixed strip; 25. First swinging area; 26. Second swinging area. Detailed implementation manners

[0027] To make the objectives, technical solutions and advantages of the present utility model clearer, the present utility model will be further described in detail below in conjunction with the attached Figures 1-11 drawings.

[0028] Embodiment 1: In a storage box provided with a clamping assembly 2, the box body is used to accommodate items, and the cover body 1 is used to seal the items. The cover body 1 is made of rubber, enabling the cover body 1 to elastically deform. A clamping groove 18 is recessed on the bottom surface of the cover body 1. The side wall of the box body and the cover body 1 are assembled in the clamping groove 18 to form the storage box. The clamping assembly 2 is connected to the cover body 1, and the clamping assembly 2 serves to facilitate clamping of items, such as Figure 1 , showing the lid of an existing storage box. In an existing integrated clip-lid storage box, when the user uses the clamping assembly 2, the elastic deformation area of the lid folds and deforms outward along the direction of the first arrow X in the figure, that is, the lid bulges and deforms in a direction away from the clamping assembly 2, resulting in an increase in the length of the lid. Therefore, this embodiment provides a lid with a clamping device, including a clamping assembly 2 and a groove-shaped cover body 1. The cover body 1 is assembled with the opening of the box body through the groove. The clamping assembly 2 includes a chuck for clamping items and an arm body for acting as a lever. A pivoting portion 17 is convexly provided on the surface of the cover body 1 facing the arm body. The rear section of the arm body is rotatably connected to the bottom surface of the cover body 1 at the pivoting portion 17. The front section of the arm body is rotatably connected to the chuck through a flexible coupling portion. The flexible coupling portion is made of polypropylene or polystyrene. The rotation axis direction of the chuck is perpendicular to the direction sequentially extending along the rear section of the arm body, the root of the chuck, and the tip of the chuck; the user can drive the arm body to clamp the item, and by adding a chuck to the arm body, the length of the clamping assembly 2 is increased. When the clamping assembly 2 clamps the item, the contact area between the clamping assembly 2 and the item is increased.

[0029] The arm body includes a first arm body 5 and a second arm body 6. The first arm body 5 and the second arm body 6 are hinged. The rear section of the first arm body 5 is rotatably connected to the cover body 1, and the rear section of the second arm body 6 is rotatably connected to the cover body 1. When the clamping assembly 2 is in the use state, the first arm body 5 and the second arm body 6 rotate relative to each other and approach each other. The cover body 1 elastically deforms and is located between the rear sections of the first arm body 5 and the second arm body 6. The chuck includes a first chuck 7 and a second chuck 8. The front section of the first arm body 5 is foldably connected to the first chuck 7, and the second chuck 8 is foldably connected to the front section of the second arm body 6. When the user needs to use the clamping assembly 2 to clamp an item, the user applies a force to the cover body 1 to cause the first arm body 5 and the second arm body 6 to rotate relative to each other, thereby driving the first chuck 7 and the second chuck 8 to approach each other to clamp the item.

[0030] Figure 2 , 8The area formed by the two dashed lines in it is the elastic deformation area 23 for the bending rotation of the cover body 1. The elastic deformation area 23 extends along the diagonal direction of the cover body 1. However, the elastic deformation area 23 is not limited to extending along the diagonal direction of the cover body 1. In the cover body 1, the areas on both sides of the elastic deformation area 23 are the first swing area 25 and the second swing area 26 respectively. When using the clamping assembly 2, the first arm body 5 and the second arm body 6 rotate relative to each other to drive the first chuck 7 and the second chuck 8 to approach each other to clamp an object. At the same time, the first swing area 25 and the second swing area 26 rotate towards the top surface of the cover body 1 respectively, that is, the first swing area 25 and the second swing area 26 rotate around the elastic deformation area 23 respectively, so that the front ends of the first arm body 5 and the second arm body 6 are clamped, and the cover body 1 forms a bent state. The first swing area 25 rotates in the same direction as the first arm body 5, and the second swing area 26 rotates in the same direction as the second arm body 6, and the cover body 1 forms a bent state. Figure 2 is the non-bent state of this embodiment, that is, the first state. Figure 8 , 9 is the bent state of this embodiment, that is, the third state. The cover body 1 is recessed along the direction of the second arrow Y to make the cover body 1 form the third state, that is, the elastic deformation area 23, the first swing area 25, and the second swing area 26 form the shape of the cover being bent. The change process is from the first state of this embodiment to the third state. The cover body 1 is recessed and deformed towards the Y direction, thereby reducing the length of the box cover during use and improving the convenience for the user during use.

[0031] The rear section of the first arm body 5 is from the hinge joint of the first arm body 5 and the second arm body 6 to the rotation joint of the first arm body 5 and the cover body 1. The rear section of the second arm body 6 is from the hinge joint of the first arm body 5 and the second arm body 6 to the rotation joint of the second arm body 6 and the cover body 1. The front section of the first arm body 5 is from the hinge joint of the first arm body 5 and the second arm body 6 to the rotation joint of the first arm body 5 and the first chuck 7. The front section of the second arm body 6 is from the hinge joint of the first arm body 5 and the second arm body 6 to the rotation joint of the second arm body 6 and the second chuck 8.

[0032] The first arm body 5 is provided with a slideway 10, and the second arm body 6 is provided with a slider 9. The slider 9 is slidably and rotatably connected to the slideway 10, and the slider 9 slides back and forth along the direction from the front section to the rear section of the arm body. The sliding direction of the slider 9 is perpendicular to the axial direction of the slider 9. The slider 9 is set as a round bar, and the arc surface of the slider 9 abuts against the inner surface of the slideway 10. The outward side of the second arm body 6 is convexly provided with a connecting portion 19, and the slider 9 is fixedly connected to the side of the connecting portion 19 facing the slideway 10. A cap portion is provided at the end of the slider 9 away from the connecting portion 19. When the clamping assembly 2 is used, the slider 9 slides along the slideway 10 toward the direction close to the clamp, thereby increasing the clearance space between the first arm body 5 and the second arm body 6 for the cover body 1, improving the convenience of driving the clamping assembly 2, and at the same time achieving the saving of the user's clamping force by changing the position of the slider 9, that is, changing the position of the fulcrum in the lever principle.

[0033] When the clamping assembly 2 is not in use, that is, in the unfolded state, the length directions of the first arm body 5 and the second arm body 6 are placed along the longest diagonal of the cover body 1. Through the above arrangement, the total length of the arm body and the clamp is maximized, which is convenient for the user to use the clamping assembly 2 to clamp objects; if the cover body 1 is a round cover, the length directions of the first arm body 5 and the second arm body 6 are arranged along the radial direction of the round cover.

[0034] Since the clamping component 2 needs to be set in a curved shape to facilitate clamping of items, and when the clamping component 2 is not in use, the arm body is in contact with the inner bottom surface of the cover body 1. If the arm body is set in a curved shape, the distance between the inner bottom surface of the cover body 1 and the chuck will be increased, thereby increasing the volume occupied by the clamping component 2 in the box body. To solve this problem, the tip of the chuck is used to clamp items, and the root of the chuck is rotatably connected to the front section of the arm body, and the arm body and the cover body 1 are rotatably connected to the rear section of the arm body. The curvature of the chuck from the tip to the root is greater than the curvature of the arm body from the front section to the rear section, thereby reducing the distance between the inner bottom surface of the cover body 1 and the chuck, thereby reducing the occupied area of the clamping component 2.

[0035] The width of the arm body is smaller than the width of the clamp head. The arm body serves to connect the clamp head and the cover body 1, while the clamp head serves to clamp the object. Through the above arrangement, the size of the arm body is reduced while retaining the functions of the arm body and the clamp head, thereby reducing the occupied volume of the clamping assembly 2.

[0036] This embodiment further includes a holding member 13. The holding member 13 is rotatably connected to the cover body 1. The holding member 13 can rotate in a direction away from the top surface of the cover body 1. The holding member 13 is located on the outer side of the rear section of the arm body. The rotation axis of the holding member 13 is parallel to the rotation axis of the arm body. When the user needs to use the clamping assembly 2, the user pulls the holding member 13 to cause elastic deformation of the cover body 1 between the rear section of the first arm body 5 and the rear section of the second arm body 6. At the same time, the holding member 13 rotates inward, so that the user can pull the holding member 13 to elastically deform the cover body 1 to drive the clamping assembly 2, that is, to drive the first arm body 5 and the second arm body 6 to rotate, so that the first chuck 7 and the second chuck 8 can approach each other to clamp an object, improving convenience. At the same time, when the cover body 1 is assembled with the box body, the user holds and lifts the storage box through the holding member 13. The holding member 13 includes a first connecting bar 14 and a second connecting bar 15 connected to the first connecting bar 14. The first connecting bar 14 and the second connecting bar 15 are both rotatably connected to the cover body 1. The first connecting bar 14 and the second connecting bar 15 respectively fit on two adjacent sides of the cover body 1, reducing the occupied volume of the holding member 13.

[0037] The first connecting bar 14 is fixedly provided with a first rotating shaft member 21, and the second connecting bar 15 is fixedly provided with a second rotating shaft member 22. The side surface of the cover body 1 is provided with a first rotating groove, and the side surface of the cover body 1 is provided with a second rotating groove. The first rotating shaft member 21 is rotatably connected to the first rotating groove, and the second rotating shaft member 22 is rotatably connected to the second rotating groove. The rotation axes of the first connecting bar 14 and the second connecting bar 15 are symmetrically arranged with respect to the normal line of the rotation axis of the arm body, so that the first connecting bar 14 and the second connecting bar 15 can rotate while fitting on two adjacent sides of the cover body 1, saving the occupied area of the box cover.

[0038] When the user needs to drive the holding member 13 to rotate, the first connecting bar 14 and the second connecting bar 15 are driven to rotate. Since the rotation axes of the first connecting bar 14 and the second connecting bar 15 are arranged at an angle, when the first connecting bar 14 and the second connecting bar 15 rotate, the distance between the swinging ends of the first connecting bar 14 and the second connecting bar 15 will increase or decrease, thereby causing interference between the holding member 13 and the cover body 1 and affecting the smooth rotation of the holding member 13. To solve the above problems, the holding member 13 is further provided with an elastic strip 16. One end of the elastic strip 16 is fixedly connected to the end surface of the first connecting bar 14, and the other end of the elastic strip 16 is fixedly connected to the end surface of the second connecting bar 15. The two ends of the elastic strip 16 are respectively fixedly connected to the opposite end surfaces of the first connecting bar 14 and the second connecting bar 15. The first connecting bar 14, the elastic strip 16, and the second connecting bar 15 are connected in sequence. The first connecting bar 14 and the second connecting bar 15 are connected by the elastic strip 16, as Figure 10As shown in the figure, in the fourth state of this embodiment, when the holding member 13 rotates outward, the distance between the swinging ends of the first link 14 and the second link 15 will increase, and the driving elastic strip 16 is in a tensioned state, so as to adapt to the rotation of the holding member 13 and reduce the possibility of interference between the holding member 13 and the cover body 1. At the same time, the user can pinch two groups of opposite elastic strips 16 to drive the clamping assembly 2 to clamp an object.

[0039] As Figure 11 shown is a partial cross-sectional schematic view of the holding member 13. Both the first link 14 and the second link 15 are hollow. A fixing strip 24 is provided inside the first link 14. Both ends of the fixing strip 24 are fixedly connected to the inner side surface of the first link 14. The elastic strip 16 is a rubber band. The elastic strip 16 is sleeved on the fixing strip 24. The second link 15 is also arranged in the same way as above. The same elastic strip 16 is connected to the first link 14 and the second link 15 in the same way at the same time. When the user applies a force to the elastic strip 16, the elastic strip 16 is in a taut state and abuts against the fixing strip 24, so as to realize the elastic setting of the elastic strip 16.

[0040] Embodiment 2: This embodiment is further improved on the basis of Embodiment 1 to provide a solution to the problem that the clamping assembly 2 occupies space. As Figure 2 shown, that is, in the first state of the present utility model, the jaws of the clamping assembly 2 are usually bent. The bent clamping assembly 2 occupies the inner volume of the box body, resulting in a large volume occupation of the clamping assembly 2 in the box body. In order to reduce the volume occupation of the clamping assembly 2 in the storage box and improve the utilization rate of the inner side of the box body for storing objects, this embodiment provides a box cover with a clamping device. As Figure 4 、 5 shown, the jaws rotate towards the arm body to form a compact storage state, that is, the second state of this embodiment. The clamping assembly 2 is in an unused form. After the user releases the cover body 1, the cover body 1 resumes its shape, driving the clamping assembly 2 to form a state of maximum angle expansion. Fold the jaws towards the arm body direction, and then assemble the cover body 1 with the box body. When the user stores an object in the storage box, the folded clamping assembly 2 plays a role in making way for the storage of the object in the storage box, thereby increasing the storage capacity of the object in the storage box.

[0041] Specifically, when the clamping assembly 2 is in an unused state, the first jaw 7 rotates towards the first arm body 5 and the second jaw 8 rotates towards the second arm body 6 to form a compact storage state.

[0042] The outer wall of the arm body is provided with a clamping groove 12, and a clamping buckle 11 is provided on the side of the chuck facing the arm body. The clamping groove 12 and the clamping buckle 11 are in snap connection. Rotate the chuck towards the arm body, and at the same time make the clamping buckle 11 and the clamping groove 12 snap together. The clamping buckle 11 and the clamping groove 12 are in interference fit to lock the rotation angle of the chuck, so that the clamping assembly 2 is locked in the folded state. The folded clamping assembly 2 serves to save the volume occupied by the clamping assembly 2.

[0043] When the clamping assembly 2 is in the unused state, the first chuck 7 and the first arm body 5 are snap-connected through the clamping groove 12 and the clamping buckle 11. The second chuck 8 is located between the first chuck 7 and the first arm body 5. The relative position between the snap-connected first chuck 7 and the first arm body 5 is in a locked state, which plays a role in limiting the rotation of the second chuck 8; in addition, a snap connection can also be provided between the second chuck 8 and the second arm body 6, and the above-mentioned snap structure is used for snap connection, which will not be elaborated here.

[0044] Of course, the above embodiments are only used to illustrate the technical concept and characteristics of the present invention. The purpose is to enable those who are familiar with this technology to understand the content of the present invention and implement it accordingly, and it cannot be used to limit the protection scope of the present invention. All modifications made according to the spirit of the main technical solution of the present invention should be covered within the protection scope of the present invention.

Claims

1. A box lid with a clamping device, comprising a lid body (1) and a clamping assembly (2), wherein the clamping assembly (2) includes an arm body (4), and the rear section of the arm body (4) is rotatably connected to the bottom surface of the lid body (1), characterized in that, It further includes a holding member (13). The arm body (4) includes a first arm body (5) and a second arm body (6). The first arm body (5) is hinged to the second arm body (6). The holding member (13) is rotatably connected to the cover body (1). On both sides of the bending and rotating area of the cover body (1) are a first swinging area (25) and a second swinging area (26) respectively. When the clamping assembly (2) is in the use state, the first arm body (5) and the second arm body (6) rotate relative to each other. The first swinging area (25) and the second swinging area (26) rotate around the bending and rotating area respectively, and the first swinging area (25) and the second swinging area (26) rotate towards the top surface of the cover body (1) respectively, so that the front sections of the first arm body (5) and the second arm body (6) are clamped together, and the cover body (1) forms a bent state.

2. The lid with a clamping device according to claim 1, characterized in that, The first arm body (5) is fixedly provided with a slideway (10), and the second arm body (6) is fixedly provided with a slider (9). The slider (9) is rotatably connected to the slideway (10). The slideway (10) extends along the direction from the front section to the rear section of the arm body (4), and the slider (9) is slidably connected back and forth to the slideway (10).

3. The lid with a clamping device according to claim 2, characterized in that, When the clamping assembly (2) is in the unused state, the first arm body (5) and the second arm body (6) are placed along the diagonal direction of the cover body (1).

4. The lid with a clamping device according to claim 3, characterized in that, The holding member (13) includes a first connecting bar (14) and a second connecting bar (15) elastically connected to the first connecting bar (14). Both the first connecting bar (14) and the second connecting bar (15) are rotatably connected to the cover body (1), and the first connecting bar (14) and the second connecting bar (15) rotate along two adjacent side surfaces of the cover body (1) respectively.

5. The lid with a clamping device according to claim 4, characterized in that, The holding member (13) is further provided with an elastic strip (16). One end of the elastic strip (16) is fixedly connected to the first connecting bar (14), and the other end of the elastic strip (16) is fixedly connected to the second connecting bar (15).

6. The lid with a clamping device according to claim 5, characterized in that, Both the first connecting bar (14) and the second connecting bar (15) are hollow. Fixed bars (24) are fixedly provided on the inner sides of the first connecting bar (14) and the second connecting bar (15). The elastic strip (16) is a rubber ring. The rubber ring is sleeved on the fixed bar (24), and the rubber ring is connected between the first connecting bar (14) and the second connecting bar (15) through the fixed bar (24).

7. A box lid with a clamping device according to claim 1, characterized in that, The clamping assembly (2) includes a chuck (3), and the chuck (3) is connected to the arm body (4).

8. A lid with a clamping device according to claim 7, characterized in that, The chuck includes a first chuck (7) and a second chuck (8). The first chuck (7) is foldably connected to the front section of the first arm body (5), and the second chuck (8) is foldably connected to the front section of the second arm body (6). When the clamping assembly (2) is in the unused state, the chuck rotates towards the arm body (4) to form a compact storage state.

9. The lid with a clamping device according to claim 8, characterized in that, A clamping groove (12) is provided on the outer wall of the arm body (4), and a clamping buckle (11) is provided on the side of the chuck facing the arm body (4). The clamping groove (12) rotates back and forth towards the clamping groove (12). When the clamping assembly (2) is in a compact storage state, the clamping groove (12) is snap-connected to the clamping buckle (11).

10. The lid with a clamping device according to claim 9, characterized in that, When the clamping assembly (2) is in an unused state, the first chuck (7) and the first arm body (5) are snap-connected through the clamping groove (12) and the clamping buckle (11), and the second chuck (8) is located between the first chuck (7) and the first arm body (5).

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