Connecting seat for rotating frame of box turnover machine of unpacking and conveying system

Abstract

The utility model relates to a rotating frame connecting seat of a box turnover machine of an unpacking and conveying system, which particularly comprises two conveying mechanisms arranged on the left side and the right side respectively. A bearing base is arranged between the two conveying mechanisms, and the upper end of the base is rotationally connected with a driven shaft. The two ends of the driven shaft are fixedly connected with mounting plates through keys. Under the structure, when the driven shaft rotates, the clamping mechanisms located at the close ends of the two mounting plates can clamp and fix the container, and transfer and turnover operation of the container is achieved. Furthermore, the lower ends of the two clamping mechanisms are jointly provided with a jacking mechanism, and the jacking mechanism is located below the container. The height of the container is adjusted through the jacking mechanism, the motion trail of the mounting plate can be effectively reduced, stroke interference between the mounting plate and the conveying mechanism is avoided, and therefore the application range of the device is widened, and the fault-tolerant capacity of the device is enhanced.

Description

TECHNICAL FIELD

[0001] The utility model relates to material transfer auxiliary component technical field especially relates to open package conveying system turnover machine rotary frame connecting seat. BACKGROUND

[0002] The main function of the turnover machine is to overturn the box conveyed by the plane conveying system, realize the exchange of the top and bottom of the box, and is widely applied to the packaging fields of cosmetics, food, medicine and other industries.

[0003] In the prior art, the turnover machine is usually composed of a rotating shaft and a driven plate fixedly connected outside the rotating shaft. In particular, the number of driven plates is two, and each driven plate is provided with a clamping mechanism near the end. The working principle is as follows: the rotating shaft drives the driven plate to change position, and the clamping mechanism fixes the container to ensure that the container can smoothly complete the conversion of the inclination angle and position when the rotating shaft rotates.

[0004] It must be pointed out that in the prior art, the rotating shaft is usually installed above the container conveying system to avoid the stroke conflict between the driven plate and the container conveying system. However, the main purpose of the turnover machine is to ensure the convenience of the subsequent processing process. Therefore, if the container is only turned over above a single container conveying system, additional container transfer is still needed to meet the requirements of the subsequent processing steps.

[0005] At the same time, in actual application, if the turnover machine is directly arranged between two container conveying systems as a transfer station between the two container conveying systems, the height difference between the two container conveying systems and the height of the turnover machine itself make it difficult to accurately set the position of the rotating shaft, so the driven plate is prone to stroke conflict with the container conveying system during operation.

[0006] In view of this, the present research proposes a new type of turnover machine rotary frame connecting seat for open package conveying system, which aims to realize the functions of container overturning and transfer, and avoid the stroke conflict between the driven plate and the container conveying system, so as to improve the fault tolerance of the equipment. CONTENT OF THE UTILITY MODEL

[0007] In view of the defects in the prior art, the utility model proposes a design of the turnover machine rotary frame connecting seat for open package conveying system. The design significantly improves the fault tolerance of the device, and effectively avoids the stroke conflict problem that may occur between the turnover machine and the container conveying mechanism. In addition, the design solves the technical challenges of the existing turnover machine in the height limitation of container overturning and transfer and the difficulty of accurate positioning of the driven plate.

[0008] In order to achieve the above purpose, the utility model adopts the following technical scheme:

[0009] The connecting seat of the rotating frame of the case turnover machine of the unpacking conveying system is provided with two conveying mechanisms arranged side by side, the conveying mechanism comprises a support frame, a plurality of support rollers with central axes horizontally arranged are arranged on the upper end of the support frame, and a bearing base is further arranged, a driven shaft is rotatably connected to the upper end of the bearing base, a driving motor is arranged on one side of the driven shaft, the output shaft of the driving motor is in transmission connection with the driven shaft through a transmission member, a mounting plate is in key connection with each axial end of the driven shaft, a clamping mechanism is arranged on the close end of each mounting plate, the movement tracks of the two conveying mechanisms and the clamping mechanisms are coincident, a jacking mechanism is arranged at the lower end of the two clamping mechanisms, the jacking mechanism is in the same vertical plane with one of the conveying mechanisms, the jacking mechanism comprises a plurality of jacking rods, the projection of each jacking rod on the horizontal plane does not overlap with the projection of the corresponding conveying mechanism on the horizontal plane, and an up-down driving member is arranged at the lower end of each jacking rod, and the jacking rod moves up and down relative to the conveying mechanism through the up-down driving member.

[0010] Preferably, the up-down driving member comprises a driven ring, a connecting rod is rotatably connected to the upper end of the driven ring, and the connecting rod is rotatably connected with the corresponding jacking rod, when the included angle between the driven ring and the connecting rod is equal to 180°, the upper end face height of the jacking rod is greater than the upper end face height of the corresponding conveying mechanism, when the included angle between the driven ring and the connecting rod is equal to 0°, the upper end face height of the jacking rod is less than the upper end face height of the corresponding conveying mechanism, a plurality of jacking rods are arranged on the lower side of the jacking rod, the jacking rod is in active connection with the bearing base, and a plurality of up-down axial limiting rods are fixedly connected to the upper end of the limiting plate, a positioning hole is formed in the jacking rod for the limiting rod, and the limiting rod is inserted into the positioning hole.

[0011] Preferably, a plurality of driven rings are jointly provided with a follow-up shaft, the follow-up shaft is rotatably connected with the bearing base, the follow-up shaft is in key connection with the driven ring, and the limiting plate is rotatably connected with the follow-up shaft.

[0012] Preferably, the follow-up shaft is provided with a gear transmission group on the side close to the driven shaft, the follow-up shaft and the driven shaft are in transmission connection through the gear transmission group, the gear transmission group is a speed reduction gear set, and the rotation speed of the follow-up shaft is less than that of the driven shaft.

[0013] Preferably, the clamping mechanism comprises a gas cylinder, the gas cylinder is located at the far end of the two mounting plates, the fixed end of the gas cylinder is fixedly connected with the corresponding mounting plate, the movable end of the gas cylinder is fixedly connected with a contact plate, a through hole is formed in the mounting plate for the movable end of the gas cylinder, the movable end of the gas cylinder is inserted into the through hole, and the contact plate is located at the close end of the two mounting plates.

[0014] Compared with the prior art, the unpacking conveying system has the beneficial effects that:

[0015] The utility model discloses a cooperative matching of driven shaft and mounting plate, realizes the clamping and fixing of the container through the clamping mechanism in the rotation process of driven shaft, thereby accomplishing the transfer and overturning operation of the container. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 It is the overall structure schematic diagram of the utility model.

[0017] Figure 2 It is the position relation schematic diagram of the utility model jacking mechanism and clamping mechanism.

[0018] Figure 3 It is the cooperation relation schematic diagram of the utility model driven shaft and drive motor.

[0019] Figure 4 It is the connection schematic diagram of the utility model clamping mechanism and mounting plate.

[0020] Figure 5 It is the overall structure schematic diagram of the utility model jacking mechanism.

[0021] Figure 6 It is the cooperation relation schematic diagram of the utility model driven shaft and driven shaft.

[0022] In the drawing: 1, conveying mechanism;101, support frame;102, support roller;2, bearing base;3, driven shaft;4, transmission mechanism;5, mounting plate;6, drive motor;7, jacking mechanism;701, up-down drive component;7011, connecting rod;7012, driven ring;702, jacking rod;703, limiting rod;704, driven shaft;705, limiting plate;8, clamping mechanism;801, air cylinder;802, contact plate;9, through hole;10, gear transmission group. DETAILED DESCRIPTION

[0023] The technical scheme in the embodiments of the utility model will be described clearly and completely below in conjunction with the drawings in the embodiments of the utility model, and obviously, the described embodiments are only part of the embodiments of the utility model, not all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by the person skilled in the art without creative labor belong to the protection scope of the utility model.

[0024] In the description of the utility model, it is understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the utility model and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the utility model.

[0025] Please refer to Figure 1 A box conveying system turnover machine rotary frame connecting seat, its structure is consistent with prior art device, mainly by two conveying mechanisms 1 arranged on the left and right side. The design of turnover machine rotary frame connecting seat aims to provide a more efficient and stable material transfer scheme, especially suitable for scenarios that require frequent turnover of containers to meet subsequent processing needs.

[0026] It is worth noting that in most application scenarios, the turnover machine is mainly responsible for the transfer of materials, and the actual needs of subsequent processing steps are met by turning over the containers. Therefore, in the conventional operation, the conveying direction of the two conveying mechanisms 1 is usually perpendicular to ensure that the container can be accurately turned over to the required position.

[0027] Specifically, each conveying mechanism 1 includes a support frame 101, and a plurality of support rollers 102 with horizontal central axes are arranged side by side on the upper end of the support frame 101. The central axis of the support roller 102 is perpendicular to the conveying direction, and the design aims to transfer the container while avoiding conflicts with other work strokes through the cooperation of the support roller 102 and the support frame 101, ensuring smooth and safe transfer process.

[0028] See Figure 1 The difference between the device and the prior art device is that it also includes a bearing base 2. In actual application, the bearing base 2 can be flexibly selected according to the site environment, and its main function is to provide support for the mechanical components involved in the present application, therefore, the bearing base 2 can adopt various forms to adapt to different working environments and needs.

[0029] See Figure 1 , Figure 2 The upper end of the bearing base 2 is rotatably connected to a driven shaft 3. The two ends of the driven shaft 3 are fixed with mounting plates 5 through key connection, so as to allow the driven shaft 3 to drive the mounting plates 5 to rotate. This design gives the turnover machine the ability to flexibly adjust the position and angle of the container during operation.

[0030] Therefore, the device is provided with a clamping mechanism 8 at each end of the two installation plates 5 close to each other. In actual operation, the installation plates 5 (clamping mechanism 8) can be moved to the four sides of the box by rotating the driven shaft 3, and the clamping mechanism 8 is used to clamp and fix the box. When the installation plates 5 are driven in reverse by the driven shaft 3, the position and inclination angle of the box change accordingly, thereby realizing the overturning operation of the box. After the clamping mechanism 8 drives the box to rotate in reverse to the desired position, the device can drive the clamping mechanism 8 in reverse to release the clamping effect on the box. At this time, the box can fall on the other side of the conveying mechanism 1, and the other conveying mechanism 1 can further drive the box to change position.

[0031] Referring to Figure 2 , Figure 4 , the clamping mechanism 8 includes a pneumatic cylinder 801 located at the end of the two installation plates 5 away from each other. The fixed end of the pneumatic cylinder 801 is firmly connected to the installation plate 5, and the movable end is connected to the contact plate 802 by a fixed connection. This design ensures the stability and reliability of the clamping mechanism 8 when clamping the box.

[0032] At the same time, a through hole 9 is provided on the installation plate 5 for the movable end of the pneumatic cylinder 801, and the movable end of the pneumatic cylinder 801 is inserted into the through hole 9. The design of the through hole 9 allows the movable end of the pneumatic cylinder 801 to move flexibly relative to the installation plate 5, and ensures that the contact plate 802 is located at the end of the two installation plates 5 close to each other. At this time, the extension and retraction of the pneumatic cylinder 801 can directly convert into the clamping action of the clamping mechanism 8, ensuring that the clamping mechanism 8 can effectively clamp and release the goods.

[0033] It should be noted that, as shown in Figure 1 , the movement trajectory of the box of the device is from left to right. This design optimizes the movement path of the box during transfer, making it more intuitive, clear, and orderly.

[0034] It is worth noting that, in order to ensure that the device can change the position of the box clamped by the driven shaft 3 by rotating, and to ensure that the device can properly place the box on the other side of the conveying mechanism 1 when the driven shaft 3 rotates in reverse, the device needs to ensure that the movement trajectories of the two conveying mechanisms 1 and the clamping mechanism 8 are accurately overlapped. This precise control of the movement trajectory is the key to efficient transfer.

[0035] In actual operation, in order to control the rotation of the driven shaft 3, as shown in Figure 2 , Figure 3 , the device is provided with a drive motor 6 on one side of the driven shaft 3, and the output shaft of the drive motor 6 is drivingly connected to the driven shaft 3 through a transmission member. In this way, the drive motor 6 can drive the driven shaft 3 to rotate in the desired direction by a certain angle, accurately controlling the position of the box.

[0036] It needs to be emphasized that in actual operation, since the single rotation angle of the driven shaft 3 is small, and the driven shaft 3 needs to drive the container to rotate, in order to ensure that the driving motor 6 can provide sufficient load, and ensure that the output shaft rotation speed of the driving motor 6 meets the expectation, generally, as shown in the figure, the device needs to configure a corresponding speed reduction mechanism on the output shaft of the driving motor 6, or directly use a speed reduction motor. This design ensures the high stability and reliability of the container turnover machine during operation. Figure 3

[0037] It needs to be noted that in practice, the transmission member has various forms, such as gear transmission, belt transmission, chain transmission, etc. In this application, in order to ensure that the driven shaft 3 can bear sufficient load, we use chain transmission, and install a chain wheel on the end of the driven shaft 3 and the output shaft of the driving motor 6 respectively, and connect the outer sides of the two chain wheels through a chain to achieve meshing transmission. This chain transmission design not only ensures the efficient operation of the transmission, but also significantly improves the durability of the entire device.

[0038] Further, as shown in the figure, Figure 2 The device is provided with a jacking mechanism 7 at the lower end of the two clamping mechanisms 8. In actual operation, by using the jacking mechanism 7, we can easily jack up the container, thereby effectively avoiding the stroke conflict between the mounting plate 5, the clamping mechanism 8 and the conveying mechanism 1, thereby improving the fault tolerance, widening the application range, and improving the turnover efficiency. This design makes the container turnover machine more flexible and efficient during operation.

[0039] Referring to Figure 2 , Figure 5 The jacking mechanism 7 includes a plurality of jacking rods 702, and the lower end of each jacking rod 702 is provided with an up-down driving member 701, so that the jacking rod 702 can move up and down linearly relative to the conveying mechanism 1. The design of this jacking mechanism 7 makes the height of the container during transfer can be accurately controlled, thereby improving the flexibility and safety of the entire transfer process.

[0040] Further, as shown in the figure, Figure 1 The device constrains the jacking mechanism 7 and one of the conveying mechanisms 1 to be in the same vertical plane, and the projections of the jacking rods 702 on the horizontal plane do not overlap with the projections of the corresponding conveying mechanisms 1 on the horizontal plane, which makes the jacking rods 702 can be driven by the up-down driving member 701 to sink above the supporting roller 102, avoiding the conflict between the container and the jacking rod 702 in space. This design effectively prevents the collision between the container and the jacking mechanism 7 during the transfer of the container, thereby improving the safety of the operation.

[0041] ​In fact, the device moves the box above the jacking rod 702 through the conveying mechanism 1, and then directly lifts the height of the box by moving the jacking rod 702 upwards, which is convenient for the clamping mechanism 8 to grab. This process eliminates the step of adjusting the position of the box and the jacking mechanism 7 when the operator flips the box, which not only improves the operation efficiency, but also reduces the burden of the operator. The design makes the whole transfer process more efficient and more humanized.

[0042] Referring to Figure 5 The up-down driving member 701 includes a driven ring 7012, and the upper end of the driven ring 7012 is rotationally connected with a connecting rod 7011. This design not only ensures the flexibility of the movement of the jacking rod 702, but also improves the stability and reliability of the whole device.

[0043] At the same time, the lower side of the plurality of jacking rods 702 is provided with a limiting plate 705, and the limiting plate 705 is movably connected with the bearing base 2. This design makes the movement range of the jacking rod 702 can be accurately controlled, thereby ensuring the accuracy and safety of the whole transfer process.

[0044] At this time, a plurality of up-down axial limiting rods 703 are fixedly connected at the upper end of the limiting plate 705, and a positioning hole is formed in the jacking rod 702 for the limiting rod 703, and by constraining the limiting rod 703 to be inserted into the corresponding positioning hole, the limiting rods 703 can limit the movement range of the jacking rod 702, ensuring that it can only move up and down in a straight line. At this time, with the rotation of the driven ring 7012, the height change process of the jacking rod 702 can be realized by the transmission effect of the connecting rod 7011. This design ensures the stability and accuracy of the jacking rod 702 during the transfer of the box.

[0045] It should be pointed out that when the angle between the driven ring 7012 and the connecting rod 7011 reaches 180°, the upper end surface of the jacking rod 702 will be higher than the upper end surface of the conveying mechanism 1; when the angle is 0°, it will be lower. This design ensures that the movement trajectory of the jacking rod 702 can be located above and below the supporting roller 102 when the up-down driving member 701 is adjusted. In this state, the jacking rod 702 not only can lift the height of the box, but also can avoid the conflict with the box in the stroke. This design makes the whole transfer process more efficient and safe.

[0046] It is worth noting that Figure 1 The jacking rod 702 has a large gap with the adjacent supporting roller 102. Therefore, in actual operation, by adjusting the rotation frequency of the driven shaft 3 (which is positively related to the jacking frequency of the jacking rod 702) and the rotating speed of the supporting roller 102 (i.e. the moving speed of the box), the conveying mechanism 1 can work continuously when the box moves slowly and flips quickly, ensuring the continuity of the processing. This design makes the whole transfer process more efficient and stable.

[0047] In addition, as Figure 5As shown, the device is provided with a follow-up shaft 704 between the plurality of driven rings 7012, which is rotationally connected with the bearing base 2. The follow-up shaft 704 is connected with the plurality of driven rings 7012 through keys, ensuring the synchronous rotation of the driven rings 7012. This design not only improves the stability and reliability of the entire device, but also simplifies the structure of the device.

[0048] Meanwhile, the limiting plate 705 is rotationally connected with the follow-up shaft 704, and the height of the limiting plate 705 is fixed by the follow-up shaft 704. This design can accurately limit the movement range of the jacking rod 702, thereby ensuring the accuracy and safety of the entire transfer process.

[0049] Further, as shown in the drawings, Figure 2 , Figure 5 , Figure 6 the device is provided with a gear transmission set 10 on the side of the follow-up shaft 704 close to the driven shaft 3, ensuring that the follow-up shaft 704 is drivingly connected with the driven shaft 3 through the gear transmission set 10. This design ensures the coordination of the cargo box overturning and jacking actions, reduces the use amount of driving components, and effectively reduces the equipment failure rate. This design not only improves the transfer efficiency, but also enhances the stability and reliability of the device.

[0050] In actual application, when the mounting plate 5 rotates from the right side to the left side, the jacking rod 702 will jack up the cargo box. During this process, when the mounting plate 5 rotates to the left side and is in the same position as the cargo box, the cargo box is just at the highest point of the jacking rod 702 stroke. At this time, the clamping mechanism 8 will instantaneously clamp the cargo box and change its position, completing the overturning. Correspondingly, when the mounting plate 5 rotates from the left side to the right side, the jacking rod 702 moves downward to complete the reset. This design makes the entire transfer process more efficient and safe.

[0051] Notably, as shown in the drawings, Figure 1 , Figure 5 in actual operation, the movement range of the mounting plate 5 is about 150° to 170°, and the movement range of the driven ring 7012 is about 45° to 70°. Therefore, in order to ensure that the driven ring 7012 (follow-up shaft 704) and the driven shaft 3 match in speed, the device is specially provided with a speed reduction gear set as the transmission mechanism 4, so that the speed of the follow-up shaft 704 is lower than that of the driven shaft 3, thereby slowing down the movement speed of the jacking mechanism 7. This design not only ensures the efficiency of the entire transfer process, but also improves the stability and reliability of the entire device.

[0052] In the actual application process of the utility model,

[0053] Firstly, the operator needs to place the cargo box on the upper end of the left conveying mechanism 1, and then push it from left to right in the horizontal direction until the cargo box is accurately positioned above the jacking mechanism 7.

[0054] Next, the driving motor 6 is started, and the mounting plate 5 is rotated from right to left. With this process, the driven ring 7012 moves from bottom to top, and the top rod 702 (i.e. the container) is slowly lifted. When the driven ring 7012 moves to the surroundings of the container, the driving motor 6 is stopped, at this time, the container has been separated from the supporting roller 102, and the height of the container exceeds the height of the upper end of the left conveying mechanism 1;

[0055] Subsequently, the operator needs to start the air cylinder 801, and the two contact plates 802 are moved towards each other to achieve clamping and fixing of the container;

[0056] Next, the driving motor 6 is started in reverse, and the mounting plate 5 drives the container to rotate to the right, and the position and inclination angle of the container are changed. In this process, the driven ring 7012 is reversely rotated from top to bottom, and the height of the top rod 702 is lowered. When the driven ring 7012 moves the container to above the right conveying mechanism 1, and the distance between the container and the upper end of the right conveying mechanism 1 is close enough, the driving motor 6 is stopped, at this time, the top rod 702 is located below the corresponding supporting roller 102;

[0057] Finally, the operator needs to drive the air cylinder 801 in reverse, and the two contact plates 802 are separated from each other, and then the container naturally slides onto the right conveying mechanism 1.

[0058] Although the embodiments of the present application have been shown and described, it can be understood by those skilled in the art that various changes, modifications, replacements and variations can be made to the embodiments without departing from the principles and spirits of the present application, and the scope of the present application is defined by the appended claims and their equivalents.

Claims

1. A rotating frame connecting seat of a case turnover machine of a bag opening and conveying system, comprising two conveying mechanisms (1) arranged left and right, the conveying mechanism (1) comprising a support frame (101), and a plurality of support rollers (102) with central axes horizontally arranged side by side on the upper end of the support frame (101), characterized in that: Also include the bearing base (2), the bearing base (2) upper end rotationally connected with driven shaft (3), and, the driven shaft (3) one side is provided with drive motor (6), drive motor (6) output shaft is connected with driven shaft (3) through transmission member and drives, The driven shaft (3) both axial ends are respectively keyed to one mounting plate (5), two mounting plates (5) are close to the end and are respectively provided with one clamping mechanism (8), and two conveying mechanisms (1) are coincident with the motion track of clamping mechanism (8). Two clamping mechanisms (8) are commonly provided with one jacking mechanism (7) at the lower end, and the jacking mechanism (7) is in the same vertical plane with one of the conveying mechanisms (1), and the jacking mechanism (7) comprises a plurality of jacking rods (702). The projection of each jacking rod (702) on the horizontal plane does not overlap the projection of the corresponding conveying mechanism (1) on the horizontal plane, and the lower end of each jacking rod (702) is provided with up-down driving member (701), and the jacking rod (702) moves up and down linearly relative to the conveying mechanism (1) through the up-down driving member (701).

2. The connection seat of the rotating frame of the unpacking conveying system turnover machine according to claim 1, characterized in that: The up-down driving member (701) comprises a driven ring (7012), and the upper end of the driven ring (7012) is rotationally connected with a connecting rod (7011), and the connecting rod (7011) is rotationally connected with the corresponding jacking rod (702). When the included angle between the driven ring (7012) and the connecting rod (7011) is equal to 180°, the upper end surface height of the jacking rod (702) is greater than the upper end surface height of the corresponding conveying mechanism (1), and when the included angle between the driven ring (7012) and the connecting rod (7011) is equal to 0°, the upper end surface height of the jacking rod (702) is less than the upper end surface height of the corresponding conveying mechanism (1). The lower side of a plurality of jacking rods (702) is commonly provided with a limiting plate (705), and the limiting plate (705) is movably connected with the bearing base (2), and the upper end of the limiting plate (705) is fixedly connected with a plurality of up-down axial limiting rods (703). The jacking rod (702) is provided with a positioning hole for the limiting rod (703), and the limiting rod (703) is inserted into the positioning hole.

3. The connection seat of the rotating frame of the unpacking conveying system turnover machine according to claim 2, characterized in that: A plurality of driven rings (7012) are commonly provided with a follow-up shaft (704), and the follow-up shaft (704) is rotationally connected with the bearing base (2), and the follow-up shaft (704) is keyed to the driven ring (7012), and the limiting plate (705) is rotationally connected with the follow-up shaft (704).

4. The connection seat of the rotating frame of the unpacking conveying system turnover machine according to claim 3, characterized in that: The side close to the driven shaft (3) of the follow-up shaft (704) is provided with a gear transmission group (10), and the follow-up shaft (704) and the driven shaft (3) are connected through the gear transmission group (10), and the gear transmission group (10) is a speed reduction gear set, and the rotation speed of the follow-up shaft (704) is less than that of the driven shaft (3).

5. The connection seat of the rotating frame of the unpacking conveying system turnover machine according to claim 1, characterized in that: The clamping mechanism (8) comprises a cylinder (801), and the cylinder (801) is located at the end away from the two mounting plates (5), and the fixed end of the cylinder (801) is fixedly connected with the corresponding mounting plate (5), and the movable end of the cylinder (801) is fixedly connected with a contact plate (802). The mounting plate (5) is provided with a through hole (9) for the movable end of the cylinder (801), the movable end of the cylinder (801) is inserted into the through hole (9), and the contact plate (802) is located close to the end of the two mounting plates (5).

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