Laminating machine box cover limiting structure

Abstract

The utility model discloses a laminating machine box cover limiting structure, including the jaw fixed seat and setting right jaw block in the right side of jaw fixed seat, the left jaw block is provided with in the left side of jaw fixed seat, the left jaw block with right jaw block is with the jaw fixed seat center point left and right symmetry setting, when the left side of left jaw block in the left side of jaw fixed seat is horizontal open state, the inside of left side top end in left jaw block center place is provided with the down arc concave's clamping wire groove B, through to the original clamping wire groove of clamping jaw block inside enlargement processing, and the two clamping wire grooves after enlargement processing all increase novel protection type steady clamping wire device, this device can avoid the recess of power cord clamp when the jaw of positive and negative pole three part machine, positive and negative pole cutting riveting machine, positive and negative pole three part machine's jaw clamps the wire box workshop, guarantees the appearance integrity and product quality of power cord, can improve the clamping wire stability again, and the dismounting convenience of device is given full play to simultaneously, the reliability and practicality of clamping operation are optimized obviously.

Description

Technical Field

[0001] This utility model belongs to the technical field of auxiliary components for automated production equipment, specifically relating to a limiting structure for a laminator box cover. Background Technology

[0002] The laminator box cover limiting structure is a key component of the positive and negative electrode cutting and riveting machine and the positive and negative electrode three-part machine in the wire box workshop. Its core function is to clamp and limit the power cord required for equipment operation through the closing action of the left and right gripper blocks, preventing the power cord from shifting or tangling due to the opening and closing of the laminator box cover or equipment vibration, thus ensuring stable equipment operation. In actual production, this structure faces a clear production pain point: the traditional grippers (mostly made of metal) of the positive and negative electrode cutting and riveting machine and the positive and negative electrode three-part machine in the wire box workshop easily damage the outer insulation of the power cord when clamping the wire. Indentations caused by clamping not only damage the appearance of the power cord but may also harm the insulation layer, affecting safety and directly reducing product quality. The core requirement to address this issue is to "prevent the clamping claws from creating indentations on the power cord's appearance." Existing technical solutions attempt to "replace the metal claws with polytetrafluoroethylene (PTFE) to reduce indentations by lowering the claw hardness." While this modification can alleviate the indentation problem to some extent, there is still room for improvement in long-term use. The existing laminator box cover limiting structure still faces shortcomings related to wire protection and clamping stability.

[0003] The protective effect of PTFE (polytetrafluoroethylene) clamps is limited, and there is still a risk of hidden damage. Although PTFE is less hard than metal, it is still a rigid material. When the clamping force increases suddenly due to load fluctuations, it may still cause compression marks on the thin insulation layer of the power cord. Moreover, the contact between the rigid material and the power cord is surface contact, and the clamping force is concentrated in the contact area, which cannot further disperse the pressure. Especially for power cords with smaller diameters, the risk of dents is not completely eliminated, making it difficult to meet the appearance and quality requirements of high-specification products. Furthermore, the clamping grooves of existing clamps are mostly smooth arc designs. PTFE has a low surface friction coefficient. When the equipment vibrates or the power cord is subjected to slight tension, the power cord is prone to sliding and shifting in the clamping groove. This shifting not only leads to limit failure but may also cause friction between the power cord and the edge of the clamping groove, resulting in insulation wear and forming a chain problem of "limit failure - cable wear," affecting the normal operation of the equipment. Utility Model Content

[0004] The purpose of this utility model is to provide a limiting structure for the cover of a laminator, in order to solve the problems mentioned in the background art. Although the polytetrafluoroethylene clamping block is softer than metal, it is still a rigid material. When the equipment load fluctuates and the clamping force increases suddenly, it is easy to squeeze the thin insulation layer of the power cord. Moreover, the surface contact causes the clamping force to be concentrated, and small-diameter power cords are still at risk of dents, making it difficult to meet the requirements of high-specification products.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a laminator box cover limiting structure, including a gripper fixing seat and a right gripper block disposed on the right side of the gripper fixing seat, a left gripper block disposed on the left side of the gripper fixing seat, the left gripper block and the right gripper block being symmetrically disposed about the center point of the gripper fixing seat, when the left gripper block is in a horizontally open state on the left side of the gripper fixing seat, a downwardly arc-shaped concave wire clamping groove B is disposed inside the left top of the center of the left gripper block, when the right gripper block is in a horizontally open state on the right side of the gripper fixing seat, a downwardly arc-shaped concave wire clamping groove A is disposed inside the right top of the center of the right gripper block, and both wire clamping groove A and wire clamping groove B are provided with protective stabilizing wire clamping devices, and the two protective stabilizing wire clamping devices are identical in shape, size and structural composition.

[0006] Preferably, the protective and stabilizing clamping device inside the clamping groove A includes an arc-shaped hollow rubber clamping sleeve and soft rubber particles. The arc-shaped hollow rubber clamping sleeve is fitted to the arc-shaped inner wall of the clamping groove A. The arc-shaped inner wall of the arc-shaped hollow rubber clamping sleeve is provided with a plurality of outwardly protruding soft rubber particles at equal intervals. The soft rubber particles have a hemispherical protrusion structure.

[0007] Preferably, the wire clamping groove A and wire clamping groove B are formed by enlarging the original wire clamping groove inside the clamping block. The arc-shaped hollow rubber wire clamping sleeve is flush with the outer walls of the front and rear ends of the left and right clamping blocks, respectively. The arc-shaped hollow rubber wire clamping sleeve is hollow inside, and the internal diameter and depth of the arc-shaped hollow rubber wire clamping sleeve are the same as the diameter and depth of the original wire clamping groove inside the clamping block.

[0008] Preferably, the protective stabilizing wire clamping device further includes a connecting groove and a fixed groove. The connecting groove is longitudinally arranged inside the bottom end of the wire clamping groove A and is connected to the inside of the wire clamping groove A. The bottom end of the connecting groove is provided with a fixed groove, which is connected to the inside of the connecting groove. The lateral width of the fixed groove is greater than the lateral width of the connecting groove.

[0009] Preferably, the protective stabilizing clamp device further includes a metal fixing slide bar and a rubber connecting strip. The rubber connecting strip is inserted into the connecting groove, and the top end of the rubber connecting strip is fixedly connected to the arc-shaped outer wall of the bottom end of the arc-shaped hollow rubber clamp sleeve. The bottom end of the rubber connecting strip is fixedly connected to a metal fixing slide bar, and the metal fixing slide bar is inserted into the fixing groove.

[0010] Preferably, the protective stabilizing clamping device further includes multiple embedded fixing screws. Multiple embedded screw holes are longitudinally arranged on the right side of the bottom center of the right clamping block, and embedded fixing screws are inserted into each of the multiple embedded screw holes. After the metal fixing slide is fully inserted into the fixing groove, the metal fixing slide and the right clamping block are fixedly connected by multiple embedded fixing screws. After the embedded fixing screws are loosened and removed, the metal fixing slide can slide directly out of the fixing groove.

[0011] Preferably, the clamp fixing seat has embedded mounting screws inserted into the center of both the front and rear ends, and the clamp fixing seat is installed and fixed by the embedded mounting screws. The center of the right end of the clamp fixing seat is provided with a right U-shaped rotating groove, the center of the left end of the clamp fixing seat is provided with a left U-shaped rotating groove, a right rotating block is provided in the right U-shaped rotating groove, and a left rotating block is provided in the left U-shaped rotating groove.

[0012] Preferably, the left rotating block and the right rotating block are both connected to the gripper fixing seat via a connecting shaft. The rear end of the connecting shaft is exposed outside the rear end of the gripper fixing seat, and the rear end of the connecting shaft is connected to an external rotating component so that the external rotating component can drive the left rotating block and the right rotating block to rotate via the connecting shaft.

[0013] Preferably, both the left end of the left rotating block and the right end of the right rotating block are provided with rotating connecting blocks, and the two rotating connecting blocks are fixedly connected to the left gripper block and the right gripper block respectively. The left rotating block and the right rotating block can drive the left gripper block and the right gripper block to rotate respectively through the rotating connecting blocks. When the left rotating block drives the left gripper block to rotate clockwise to the upward vertical state through the rotating connecting blocks, and the right rotating block drives the right gripper block to rotate counterclockwise to the upward vertical state through the rotating connecting blocks, the left gripper block and the right gripper block are closed to each other.

[0014] Compared with the prior art, the present invention provides a laminator box cover limiting structure, which has the following beneficial effects:

[0015] This invention enlarges the original clamping grooves inside the gripper block and adds a novel protective and stable clamping device to both enlarged grooves. This device prevents the power cord from being dented by the grippers of positive and negative electrode cutting and riveting machines or three-part positive and negative electrode machines in the wire box workshop, ensuring the integrity of the power cord's appearance and product quality. It also improves clamping stability while maintaining ease of assembly and disassembly, significantly optimizing the reliability and practicality of clamping operations. The core of this device uses a soft rubber contact design. The curved hollow rubber clamp sleeve and the soft rubber particles with hemispherical protrusions on the inner wall of the cable tray are both made of flexible materials. Compared with traditional metal clamps, the flexible rubber can significantly reduce the hardness impact when clamping the cable, and avoid the clamps directly contacting the power cord rigidly. When the left and right clamp blocks close to clamp the cable, the rubber sleeve and soft rubber particles will deform slightly with the shape of the power cord to form a wrap-around clamp, which disperses the clamping force and effectively protects the outer insulation layer of the power cord. This completely solves the problem that the power cord is easily dented before the modification, and improves the product's appearance and quality.

[0016] The internal diameter and depth of the device's arc-shaped hollow rubber clamp sleeve perfectly match the original clamping groove of the gripper block, ensuring that the power cord can be accurately embedded inside the clamp sleeve and avoiding clamping position deviation. Furthermore, the soft rubber particles on the inner wall of the clamp sleeve increase friction with the power cord surface, preventing the power cord from slipping even during slight vibrations of the gripper or during transmission, ensuring the stability of the clamping operation, and reducing rework caused by loose power cords. The device is connected to the gripper block via a rubber connecting strip and a metal fixing slide. The connecting strip is inserted into the connecting groove, and the metal fixing strip is embedded in the fixing groove (the width of the fixing groove is larger than that of the connecting groove, which can limit the vertical displacement of the strip). It is then locked by the embedded fixing screw. This structure not only ensures that the rubber wire clamp sleeve is firmly fixed in the wire clamping groove to prevent it from falling off when clamping the wire, but also facilitates later maintenance. When the rubber sleeve is worn due to long-term use, simply loosen the embedded fixing screw to slide the metal strip out of the fixing groove and quickly replace the new rubber wire clamp sleeve without disassembling the entire clamping block, thus reducing maintenance costs and downtime. Attached Figure Description

[0017] Figure 1 This is a front-view perspective three-dimensional structural diagram of a laminator box cover limiting structure in its unfolded state, according to the present invention.

[0018] Figure 2 This is a top view of the unfolded state of a laminator box cover limiting structure according to the present invention.

[0019] Figure 3 This is a front-view perspective three-dimensional structural diagram of a laminator box cover limiting structure in a closed state according to the present invention.

[0020] Figure 4This is a front-view three-dimensional structural diagram of the protective stabilizing wire clamping device of this utility model.

[0021] Figure 5 This is a three-dimensional disassembly diagram of the protective stabilizing wire clamping device of this utility model.

[0022] In the diagram: 1. Wire clamping groove A; 2. Clamping claw fixing seat; 3. Connecting shaft; 4. Right U-shaped rotating groove; 5. Embedded mounting screw; 6. Left U-shaped rotating groove; 7. Rotating connecting block; 8. Wire clamping groove B; 9. Protective stabilizing wire clamping device; 10. Left clamping claw block; 11. Left rotating block; 12. Right rotating block; 13. Right clamping claw block; 14. Connecting slide groove; 15. Fixing slide groove; 16. Metal fixing slide bar; 17. Rubber connecting strip; 18. Arc-shaped hollow rubber wire clamping sleeve; 19. Soft rubber granules; 20. Embedded fixing screw. Detailed Implementation

[0023] 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, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0024] This utility model provides, for example Figure 1-5 The diagram illustrates a laminator lid limiting structure. This structure is designed with precise cable clamping and protection as its core objectives. Through a symmetrical clamp layout, a rotatable closure mechanism, and a flexible cable clamping protection device, it achieves stable clamping and aesthetic protection of the power cord. The core supporting component is the clamp fixing seat 2, with embedded mounting screws 5 inserted into the center of both its front and rear ends. These screws securely mount the fixing seat to the designated position on the laminator lid, providing a stable reference for the entire limiting structure and preventing clamping deviation due to seat displacement during cable clamping. The clamp fixing seat 2 has symmetrically arranged left and right clamps... The left and right gripper blocks 10 and 13 (with the center of the fixed base as the center of symmetry) are the actuators for limiting the clamping of the wire. When the left gripper block 10 is in a horizontally open state on the left side of the fixed base, a downward arc-shaped groove B8 is provided inside the top left of its center. Correspondingly, when the right gripper block 13 is in a horizontally open state on the right side of the fixed base, a downward arc-shaped groove A1 is provided inside the top right of its center. The arc-shaped groove is designed to fit the cylindrical shape of the power cord, which can increase the contact area with the power cord and avoid excessive local force on the power cord when clamping. At the same time, it leaves space for the subsequent installation of protective devices.

[0025] like Figure 1 , Figure 2 and Figure 3As shown, to drive the gripper block from opening to closing, a transmission structure of rotating block and rotating shaft is designed between the gripper fixing seat 2 and the gripper block. The core principle is that external power drives the rotating shaft to rotate, causing the gripper block to flip and close. A right U-shaped rotating groove 4 is opened inside the center of the right end of the gripper fixing seat 2, and a left U-shaped rotating groove 6 is opened inside the center of the left end. The right rotating block 12 and the left rotating block 11 are placed in the grooves respectively. The opening of the U-shaped groove faces the gripper block, providing space for the rotating block to flip, while limiting the left and right displacement of the rotating block to ensure a stable rotation trajectory. The left rotating block 11, the right rotating block 12 and the gripper fixing seat 2 are all connected by... The connecting shaft 3 is connected, with its rear end exposed outside the rear end of the fixed base and connected to external rotating components (such as motors and cylinder drive components). This design allows external power to be transmitted to the rotating block through the shaft, providing a power source for the gripper to rotate. Rotating connecting blocks 7 are fixed to the left end of the left rotating block 11 and the right end of the right rotating block 12. The two connecting blocks are fixedly connected to the left gripper block 10 and the right gripper block 13, respectively. The rotating connecting block 7 serves as a transitional connection between the rotating block and the gripper block, which can convert the rotational motion of the rotating block into the rotational motion of the gripper block. The rigid structure of the connecting block can ensure that the power transmission is lossless and prevent the gripper block from loosening.

[0026] like Figure 1 , Figure 2 and Figure 3 As shown, when the external rotating component drives the connecting shaft 3 to rotate, the left rotating block 11 will drive the left gripper block 10 to rotate clockwise, and the right rotating block 12 will drive the right gripper block 13 to rotate counterclockwise. When the left gripper block 10 rotates to the vertical upward position and the right gripper block 13 rotates to the vertical upward position, the two close together. The wire clamping groove A1 and the wire clamping groove B8 together form a complete circular wire clamping space, which wraps and limits the power cord. Its symmetrical rotation design ensures that the left and right gripper blocks 13 rotate synchronously. When closed, the wire clamping grooves are completely aligned to prevent the power cord from shifting. The external rotating component can control the clamping force by adjusting the speed or driving force, which not only ensures that the power cord does not slip but also avoids excessive clamping and damage to the cable. The horizontal open state makes it easy to put the power cord in, and the vertical closed state achieves tight limiting, which is suitable for the wire clamping needs during the opening and closing of the laminator box cover and does not affect the normal operation of the box cover.

[0027] like Figure 1 , Figure 4 and Figure 5As shown, to solve the problem of dents easily caused by traditional metal clamps, protective and stable clamping devices 9 (with identical structures) are installed inside both clamping grooves A1 and B8. The core design is flexible contact plus stable fixation. The core contact component of the device is an arc-shaped hollow rubber clamping sleeve 18, which fits perfectly against the arc-shaped inner wall of clamping groove A1 (and clamping groove B8) and is flush with the outer walls of the front and rear ends of the clamping block. This avoids the rubber sleeve protruding and affecting the clamping closure, and ensures that the cable can be completely embedded inside the sleeve. It should be noted that clamping grooves A1 and B8 are enlarged from the original clamping grooves of the clamping block, and the internal diameter and depth of the arc-shaped hollow rubber clamping sleeve 18 are completely the same as the original clamping grooves. The principle behind this design is that the enlarged clamping groove provides installation space for the rubber sleeve, while the internal dimensions of the rubber sleeve match the original groove, ensuring that the power cord can still be accurately positioned and avoiding clamping deviation caused by the addition of protective devices. The curved inner wall of the rubber clamping sleeve is equidistantly provided with multiple hemispherical protrusions of soft rubber particles 19. The soft rubber particles 19 serve two purposes: first, they increase the friction with the surface of the power cord, preventing the power cord from slipping even if the clamps vibrate slightly, thus improving clamping stability; second, the granular structure can disperse the clamping force, preventing excessive local pressure on the cable. Combined with the flexible properties of the rubber material, this completely eliminates the dent problem caused by traditional metal clamps, protecting the appearance and insulation integrity of the power cord.

[0028] like Figure 1 , Figure 4 and Figure 5 As shown, the device uses a sliding groove and a sliding bar structure to fix the clamping block, while also considering the convenience of later maintenance. A connecting groove 14 (communicating with the inside of the clamping groove) is longitudinally formed inside the bottom of the clamping groove A1. A fixing groove 15 (communicating with the connecting groove 14) is formed at the bottom of the connecting groove 14, and the horizontal width of the fixing groove 15 is greater than that of the connecting groove 14. This groove design, narrower at the top and wider at the bottom, can prevent the subsequently installed sliding bar from detaching upwards, ensuring a stable fixation. A rubber connecting strip 17 is inserted into the connecting groove 14, and its top end is fixedly connected to the outer wall of the bottom end of the arc-shaped hollow rubber clamping sleeve 18. A metal fixing sliding bar 16 is fixed to the bottom end of the rubber connecting strip 17, and the sliding bar is inserted into the fixing groove 15. The flexibility of the 17 can adapt to the arc contour of the wire clamping groove, ensuring that the rubber sleeve fits tightly against the inner wall of the wire clamping groove. The rigidity of the metal fixing slide 16 can enhance the overall structural stability and prevent the rubber sleeve from deforming and shifting when clamping the wire. Multiple embedded screw holes are opened longitudinally on the right side of the bottom center of the right claw block 13. Embedded fixing screws 20 are inserted into the holes. When the metal fixing slide 16 is fully inserted into the fixing slide groove 15, the screw passes through the screw hole and fixes the slide, locking the entire protective device in the wire clamping groove. If the rubber sleeve is worn due to long-term use, simply loosen and remove the screw to slide the metal slide out of the fixing slide groove 15 for quick replacement of the new device without disassembling the claw block, which greatly reduces maintenance costs and downtime.

[0029] Finally, it should be noted that the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. 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 limiting structure for a laminator box cover, comprising a gripper fixing seat (2) and a right gripper block (13) disposed on the right side of the gripper fixing seat (2), wherein a left gripper block (10) is disposed on the left side of the gripper fixing seat (2), the left gripper block (10) and the right gripper block (13) are symmetrically disposed about the center point of the gripper fixing seat (2), wherein when the left gripper block (10) is in a horizontally open state on the left side of the gripper fixing seat (2), a downwardly arc-shaped groove B (8) is disposed inside the left top edge of the center of the left gripper block (10), and when the right gripper block (13) is in a horizontally open state on the right side of the gripper fixing seat (2), a downwardly arc-shaped groove A (1) is disposed inside the right top edge of the center of the right gripper block (13), characterized in that: The wire clamping groove A (1) and the wire clamping groove B (8) are both equipped with protective stabilizing wire clamping devices (9), and the two protective stabilizing wire clamping devices (9) are identical in shape, size and structure. The protective and stable wire clamping device (9) inside the wire clamping groove A (1) includes an arc-shaped hollow rubber wire clamping sleeve (18) and soft rubber particles (19). The arc-shaped hollow rubber wire clamping sleeve (18) is attached to the arc-shaped inner wall of the wire clamping groove A (1). The arc-shaped hollow rubber wire clamping sleeve (18) has multiple outwardly protruding soft rubber particles (19) arranged at equal intervals on the arc-shaped inner wall. The soft rubber particles (19) are hemispherical protrusion structures.

2. The laminator box cover limiting structure according to claim 1, characterized in that: The clamping groove A (1) and clamping groove B (8) are formed by enlarging the original clamping groove inside the clamping block. The arc-shaped hollow rubber clamping sleeve (18) is flush with the outer walls of the front and rear ends of the left clamping block (10) and the right clamping block (13). The arc-shaped hollow rubber clamping sleeve (18) is hollow inside, and the internal diameter and depth of the arc-shaped hollow rubber clamping sleeve (18) are the same as the diameter and depth of the original clamping groove inside the clamping block.

3. The laminator box cover limiting structure according to claim 2, characterized in that: The protective stabilizing wire clamping device (9) further includes a connecting groove (14) and a fixed groove (15). The connecting groove (14) is longitudinally arranged inside the bottom end of the wire clamping groove A (1) and is connected to the inside of the wire clamping groove A (1). The bottom end of the connecting groove (14) is provided with a fixed groove (15) and is connected to the inside of the connecting groove (14). The horizontal width of the fixed groove (15) is greater than the horizontal width of the connecting groove (14).

4. The laminator box cover limiting structure according to claim 3, characterized in that: The protective stabilizing clamp device (9) further includes a metal fixing slide bar (16) and a rubber connecting strip (17). The rubber connecting strip (17) is inserted into the connecting groove (14), and the top of the rubber connecting strip (17) is fixedly connected to the bottom arc-shaped outer wall of the arc-shaped hollow rubber clamp sleeve (18). The bottom of the rubber connecting strip (17) is fixedly connected to the metal fixing slide bar (16), and the metal fixing slide bar (16) is inserted into the fixing groove (15).

5. The laminator box cover limiting structure according to claim 4, characterized in that: The protective stabilizing clamping device (9) also includes multiple embedded fixing screws (20). Multiple embedded screw holes are longitudinally arranged on the right side of the bottom center of the right jaw block (13), and embedded fixing screws (20) are inserted into each of the multiple embedded screw holes. After the metal fixing slide (16) is fully inserted into the fixing groove (15), the metal fixing slide (16) and the right jaw block (13) are fixedly connected by multiple embedded fixing screws (20). After the embedded fixing screws (20) are loosened and removed, the metal fixing slide (16) can slide directly out of the fixing groove (15).

6. The laminator box cover limiting structure according to claim 1, characterized in that: The clamp fixing seat (2) has embedded mounting screws (5) inserted into the center of both the front and rear ends, and the clamp fixing seat (2) is installed and fixed by the embedded mounting screws (5). The clamp fixing seat (2) has a right U-shaped rotating groove (4) inside the center of the right end, and a left U-shaped rotating groove (6) inside the center of the left end. The right U-shaped rotating groove (4) has a right rotating block (12) and the left U-shaped rotating groove (6) has a left rotating block (11).

7. The laminator box cover limiting structure according to claim 6, characterized in that: The left rotating block (11) and the right rotating block (12) are connected to the gripper fixing seat (2) by a connecting shaft (3). The rear end of the connecting shaft (3) is exposed outside the rear end of the gripper fixing seat (2), and the rear end of the connecting shaft (3) is connected to an external rotating component so that the external rotating component can drive the left rotating block (11) and the right rotating block (12) to rotate through the connecting shaft (3).

8. The laminator box cover limiting structure according to claim 7, characterized in that: The left end of the left rotating block (11) and the right end of the right rotating block (12) are both provided with rotating connecting blocks (7), and the two rotating connecting blocks (7) are fixedly connected to the left gripper block (10) and the right gripper block (13) respectively. The left rotating block (11) and the right rotating block (12) can drive the left gripper block (10) and the right gripper block (13) to rotate through the rotating connecting blocks (7) respectively. When the left rotating block (11) drives the left gripper block (10) to rotate clockwise to the upward vertical state through the rotating connecting blocks (7), and when the right rotating block (12) drives the right gripper block (13) to rotate counterclockwise to the upward vertical state through the rotating connecting blocks (7), the left gripper block (10) and the right gripper block (13) are closed to each other.

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