A wall switch assembly machine

Abstract

This invention relates to a wall switch assembly machine, comprising a base and a bracket mounted on the base. A first positioning mold and a spring positioning mechanism are mounted on the base. A feeding mechanism and a pressing mechanism are connected to the bracket. The feeding mechanism is positioned above the first positioning mold. Two spring positioning mechanisms are symmetrically arranged at the left and right ends of the first positioning mold. The pressing mechanism is suspended above the first positioning mold. This invention automates the assembly process of the switch base and button panel of the wall switch through the coordinated operation of these mechanisms, reducing manual operation and increasing assembly speed. The positioning of the switch base by the first positioning mold, the positioning and clamping of the spring by the spring positioning mechanism, the positioning of the button panel by the feeding mechanism, and the precise pressing of the pressing mechanism ensure accurate spring positioning and good engagement between the button panel and the switch base, reducing product defect rates and improving product reliability and stability.

Description

Technical Field

[0001] This utility model relates to the field of production equipment for embedded wall switches, and specifically to a wall switch assembly machine. Background Technology

[0002] In the field of modern building electrical systems, embedded wall switches, as key components for controlling the power on and off of various electrical devices, are widely used in residential, commercial, and industrial buildings. With the development of the construction industry and people's increasing demands for quality of life, the market demand for wall switches continues to grow, placing higher requirements on their production efficiency and quality.

[0003] Currently, there are many problems in the assembly process of the switch base and the button plate during the production of wall switches. To enable the pressing function of the wall switch, a spring is usually placed between the switch base and the button plate. However, in existing technologies, this crucial pressing assembly process mostly relies on manual operation. In manual pressing, workers must hold the switch base and the button plate, attempting to precisely align and press them together. Due to the lack of effective auxiliary positioning tools, it is difficult to ensure that the spring remains in a fixed position during the pressing process. In practice, the spring is prone to displacement. Once this occurs, after the button plate and switch base are pressed together, the buttons on the button plate often cannot be pressed normally, rendering the product unusable. At this point, it is necessary to disassemble the pressed button plate and switch base and reinstall them. This not only wastes a great deal of time and labor costs, but the frequent disassembly operations may also damage product components, further increasing the scrap rate.

[0004] From a production efficiency perspective, the speed of manual pressing is limited by the workers' skill level and physical strength, resulting in a long assembly time for each product, making it difficult to meet the needs of large-scale production. During peak production periods, a large backlog of wall switches awaiting assembly severely impacts the smoothness of the entire production process, leading to low production efficiency and extended delivery cycles for the company.

[0005] From a product quality perspective, the consistency and accuracy of manual operation are difficult to guarantee. Different workers have different operating techniques and force levels, and even the same worker may experience fatigue after working for a long time, resulting in inconsistent product quality. Button pressing failures caused by spring misalignment lead to a high product defect rate, which not only increases the company's production costs but may also affect the company's market reputation.

[0006] In conclusion, the existing manual pressing and assembly method for wall switches can no longer meet the demands of modern production for high efficiency and high quality. Therefore, developing a production equipment that can automate the pressing and assembly of wall switches and effectively ensure accurate spring positioning has become an urgent problem to be solved in the industry. Utility Model Content

[0007] This invention overcomes the shortcomings of the above-mentioned technology and provides a wall switch assembly machine.

[0008] To achieve the above objectives, the present invention adopts the following technical solution:

[0009] A wall switch assembly machine includes a base and a bracket mounted on the base. A first positioning mold and a spring positioning mechanism are mounted on the base. A feeding mechanism and a pressing mechanism are connected to the bracket. The feeding mechanism is located above the first positioning mold. Two spring positioning mechanisms are provided and symmetrically arranged at the left and right ends of the first positioning mold. The pressing mechanism is suspended above the first positioning mold.

[0010] Furthermore, the first positioning mold is detachably connected to the base, and the first positioning mold includes a recessed stepped positioning groove.

[0011] Furthermore, the spring positioning mechanism includes a support frame, a first cylinder mounted on the upper end of the support frame, and a pressure plate connected to the first cylinder, wherein the pressure plate has a positioning hole.

[0012] Furthermore, the feeding mechanism includes a base plate connected to the support, a second positioning mold slidably connected to the base plate via a first slider, and a second cylinder connected to the front end of the second positioning mold. The base plate is provided with a first slide rail, the first slider is slidably connected to the first slide rail, and the second positioning mold has a through hole.

[0013] Furthermore, the pressing mechanism includes a first Z-axis moving module and a second Z-axis moving module that is drively connected to the first Z-axis moving module, wherein the second Z-axis moving module is disposed at the front end of the first Z-axis moving module.

[0014] Furthermore, the first Z-axis moving module includes a third cylinder mounted on a bracket, a pressure plate connected to the lower end of the third cylinder via a guide rod, and a detachable pressure head connected to the lower end of the pressure plate. Two pressure heads are symmetrically arranged.

[0015] Furthermore, the second Z-axis moving module includes a first connecting plate connected to the bracket, a second connecting plate slidably connected to the first connecting plate via a second slider, and a fourth cylinder mounted on the bracket. The lower end of the fourth cylinder is connected to the second connecting plate. A second slide rail is provided on the first connecting plate, and the second slider is slidably connected to the second slide rail. The second connecting plate is L-shaped, and a groove is provided on the inner side of the pressing head. The two sides of one end of the second connecting plate are slidably connected to the grooves of the two pressing heads, respectively.

[0016] Compared with the prior art, the beneficial effects of this utility model are:

[0017] The wall switch assembly machine in this case automates the assembly process of the switch base and button panel through the coordinated operation of various mechanisms. This reduces manual operation, increases assembly speed, and significantly improves assembly efficiency, meeting the needs of large-scale production. The machine utilizes a first positioning mold to position the switch base, a spring positioning mechanism to position and clamp the spring, a feeding mechanism to position the button panel, and a pressing mechanism to precisely press the switch base. This ensures accurate spring positioning and a high-quality fit between the button panel and the switch base, reducing product defect rates, improving product reliability and stability, minimizing manual intervention in the assembly process, reducing worker workload, and improving the working environment. Attached Figure Description

[0018] Figure 1 This is a 3D view of the assembly machine used in this case.

[0019] Figure 2 This is a schematic diagram of the spring positioning mechanism in this case.

[0020] Figure 3 This is a structural diagram of the combined state of the feeding mechanism, the first positioning mold, and the switch base to be assembled in this case.

[0021] Figure 4 This is a schematic diagram of the pressing mechanism in this case.

[0022] Figure 5 This is a structural schematic diagram of the switch base to be assembled in this case. Detailed Implementation

[0023] The following examples provide a more detailed description of the features and other related characteristics of this utility model, to facilitate understanding by those skilled in the art:

[0024] For ease of description and understanding, please refer to the orientation shown in the attached diagram for descriptions related to positional relationships such as front, back, top, bottom, left, right, outside, and inside, as well as descriptions related to the X, Y, and Z axes.

[0025] An embedded wall switch typically includes a switch base, a button panel, and an outer panel for the button panel. To achieve a pressing function, an embedded wall switch generally uses a spring 200 between the switch base 100 and the button panel. The assembly machine disclosed in this case is used for assembling the switch base 100 and the button panel.

[0026] like Figures 1 to 5As shown, this invention provides a wall switch assembly machine, including a base 1 and a bracket 2 mounted on the base 1. A first positioning mold 3 and a spring positioning mechanism 4 are mounted on the base 1. The base 1 serves as the basic support component of the entire assembly machine, bearing the first positioning mold 3, the spring positioning mechanism 4, and other components, ensuring the stability of each component during operation, providing a stable working platform, and ensuring that the assembly accuracy is not affected by shaking or displacement of the components during operation, thus improving the reliability and assembly quality of the equipment. Specifically, the first positioning mold 3 is custom-designed according to the shape and size of the switch base 100, made of wear-resistant materials such as mold steel, and its surface is finely machined. The first positioning mold 3 provides accurate positioning for the switch base 100, ensuring the positional accuracy of the switch base 100 during assembly, improving the positioning accuracy of the switch base 100, and enabling more precise subsequent spring 200 positioning and button plate pressing operations, reducing assembly errors and improving the assembly quality of the product. Specifically, two spring positioning mechanisms 4 are provided, symmetrically arranged at the left and right ends of the first positioning mold 3. In specific implementation, the spring positioning mechanisms 4 on both sides are inclined downwards towards the first positioning mold 3. The spring positioning mechanisms 4 on both sides of the first positioning mold 3 work together to position and clamp the spring 200 in the switch base 100 on the first positioning mold 3, ensuring that the spring 200 remains vertical during the button plate pressing process. This prevents the spring 200 from shifting position, effectively solving the problem in the prior art where spring 200 position shift causes the button to be unable to be pressed normally, reducing the product defect rate and improving the product qualification rate and reliability. The bracket 2 is connected to the feeding mechanism 5 and the pressing mechanism 6. In specific implementation, the height and position of the bracket 2 are designed according to the working requirements of the feeding mechanism 5 and the pressing mechanism 6. The bracket 2 provides installation and support for the feeding mechanism 5 and the pressing mechanism 6, providing a suitable position and height for operation, ensuring the relative positional accuracy between the mechanisms, and enabling each mechanism to accurately cooperate with the first positioning mold 3, achieving efficient assembly of the wall switch. The feeding mechanism 5 is positioned above the first positioning mold 3. It accurately moves above the mold for manual placement of the wall switch's button plate, ensuring precise positioning of the button plate and aligning it accurately with the switch base 100 on the first positioning mold 3, facilitating subsequent pressing. The pressing mechanism 6, suspended above the first positioning mold 3, presses the button plate from the feeding mechanism 5 onto the switch base 100 in the first positioning mold 3, engaging the button plate and switch base 100 to complete the wall switch assembly. This automated pressing of the button plate and switch base ensures the pressing force and precision, improving assembly quality and efficiency.

[0027] As described above, in specific operation, the operator first places the switch base 100 on the first positioning mold 3. At this time, the feeding mechanism 5 is in a retracted state and will not affect the operator's operation. The spring 200, which has been initially positioned by the operator, is already installed on the switch base 100. The spring positioning mechanisms 4 on both sides of the first positioning mold 3 are activated to accurately position and clamp the spring 200 in the switch base 100, ensuring that the spring 200 is in a vertical position. After the spring 200 is positioned, the feeding mechanism 5 is activated and moves above the first positioning mold 3. The operator places the button plate of the wall switch on the feeding mechanism 5, ensuring that the button plate is accurately positioned. The pressing mechanism 6 is activated to evenly and firmly press the button plate on the feeding mechanism 5 onto the switch base 100 in the first positioning mold 3, so that the button plate and the switch base 100 are engaged, completing the assembly of the wall switch.

[0028] After assembly, the pressing mechanism 6 rises to its original position, the feeding mechanism 5 retracts, and the spring positioning mechanism 4 releases the grippers. Finally, the assembled wall switch is manually removed from the first positioning mold 3.

[0029] Furthermore, in practical implementation, users can add an automatic feeding device, such as a vibratory feeder, conveyor belt, and robotic arm, to one side of the feeding mechanism 5 to achieve automatic feeding of the keypad. Simultaneously, an automatic unloading device, such as a robotic gripper or conveyor belt, can be installed next to the first positioning mold 3 to automatically remove the assembled wall switch and transport it to the next process, further improving production efficiency. Of course, for feeding the switch base 100, an automatic feeding system, such as a hopper, vibratory feeder, pushing mechanism, and positioning device, can also be used to achieve automatic feeding of the switch base 100, reducing manual intervention.

[0030] like Figure 1 , Figure 3 As shown, the first positioning mold 3 is detachably connected to the base 1. The first positioning mold 3 includes a recessed stepped positioning groove 31. That is, the positioning groove 31 is recessed on the surface of the first positioning mold 3, forming a stepped structure. The size and shape of the steps are designed according to the specific shape and size of the switch base 100, enabling a tight fit with the switch base 100. The stepped design restricts the movement of the switch base 100 from multiple directions and levels, ensuring the stability of the switch base 100 during assembly, further improving the positioning accuracy of the switch base and reducing assembly errors caused by base position deviations. This helps improve the accuracy of spring 200 positioning and button plate pressing, thereby improving the assembly quality and reliability of the product. In specific implementation, the first positioning mold 3 and the base 1 are detachably connected by screws or other means. When assembling different models of wall switches, only the corresponding first positioning mold 3 needs to be replaced, expanding the application range of the assembly machine in this case.

[0031] Specifically, such as Figure 1 , Figure 2 As shown, the spring positioning mechanism 4 includes a support frame 41, a first cylinder 42 mounted on the upper end of the support frame 41, and a pressure plate 43 connected to the first cylinder 42. The first cylinder 42 drives the pressure plate 43 to move toward the switch base 100 on the first positioning mold 3. Positioning holes 431 are provided on the pressure plate 43. In specific implementations, the diameter and depth of the positioning holes 431 can be designed according to the dimensions of the spring 200 to ensure a tight fit with the spring 200. The number of positioning holes 431 can be adaptively set according to the number of springs required for the switch. By setting the positioning holes 431, the spring 200 is positioned and clamped. When the pressure plates 43 on both sides approach and press, the two sides of the spring 200 are restricted within the positioning holes 431. The inner wall of the positioning holes 431 constrains the spring, ensuring that the spring is in a vertical state. This effectively ensures the accurate position of the spring 200 during assembly, preventing the spring 200 from shifting and causing the button plate and switch base to be unable to be pressed normally after pressing, thus improving the product's pass rate and reliability. Secondly, the positioning hole 431 effectively prevents damage to the spring 200 when the pressure plates 43 on both sides are clamped. In practice, the pressure plate 43 is detachably connected to the first cylinder 42 by means of screws or snap-fit. Users can configure different pressure plates 43, and when changing the switch model, only the corresponding pressure plate 43 needs to be replaced.

[0032] like Figure 1 , Figure 3 As shown, the feeding mechanism 5 includes a base plate 51 connected to the bracket 2, a second positioning mold 53 slidably connected to the base plate 51 via a first slider 52, and a second cylinder 54 connected to the front end of the second positioning mold 53. A first slide rail 511 is provided on the base plate 51, and the first slider 52 is slidably connected to the first slide rail 511. A through hole 531 is provided on the second positioning mold 53. In specific implementation, the through hole 531 is shaped to fit the button panel. The through hole 531 is used for accurate positioning of the button panel and allows the pressing mechanism 6 to press the button panel downwards from the through hole 531 and press it firmly onto the switch base 100 on the first positioning mold 3. The second positioning mold 53 is detachably connected to the second cylinder 54 via screws, snap-fit, or other means. When adapting to different models of wall switches, the corresponding second positioning mold 53 can be replaced.

[0033] As described above, the feeding mechanism 5 in this case uses the through hole 531 of the second positioning mold 53 to position the keypad in a shape-fitting manner. Combined with the precision guidance of the first slider 52 and the first slide rail 511, it ensures the accurate positioning of the keypad during the transfer process, avoiding misalignment caused by manual placement or movement deviations, and improving the assembly accuracy of the keypad and the switch base 100. The second cylinder 54 drives the second positioning mold 53 to automatically switch between the initial position and the pressing position. The operator only needs to place the keypad in the pressing position, without frequently moving or manually adjusting the position of the second positioning mold 53, which improves the positioning accuracy of the keypad, reduces labor intensity, and improves operating efficiency. The detachable design of the second positioning mold 53 allows the equipment to quickly adapt to different models of keypads. Only the corresponding mold needs to be replaced to meet the production requirements of various products, reducing equipment changeover costs and improving the flexibility of the production line.

[0034] like Figure 1 , Figure 4 As shown, the pressing mechanism 6 includes a first Z-axis moving module 61 and a second Z-axis moving module 62 that is driven by the first Z-axis moving module 61. In specific implementation, the first Z-axis moving module is used to drive the second Z-axis moving module 62 to initially press down, and the second Z-axis moving module 62 presses down again to perform pressing. This hierarchical drive design divides the pressing process into two stages: "rapid approach" and "precise pressing," which reduces idle time and avoids problems such as button plate deformation or incomplete engagement caused by uneven pressure or stroke error through the high-precision control of the second Z-axis moving module 62, thus improving assembly quality. By setting independent control of the two-stage Z-axis moving modules, users can adjust the pressing parameters for different models of wall switches, enabling the assembly machine in this case to adapt to the pressing requirements of various specifications of button plates and switch bases 100 without significant changes to the hardware structure. The second Z-axis moving module 62 is located at the front end of the first Z-axis moving module 61 to provide manual operating space for placing the switch base 100 and the button plate, avoiding interference.

[0035] Continue as Figure 1 , Figure 4As shown, specifically, the first Z-axis moving module 61 includes a third cylinder 611 mounted on the bracket 2, a pressure plate 613 connected to the lower end of the third cylinder 611 via a guide rod 612, and a detachable pressure head 614 connected to the lower end of the pressure plate 613. Two pressure heads 614 are symmetrically arranged. In practice, the pressure head 614 and the pressure plate 613 are detachably connected by screws, snap-fit ​​connections, or other means. Users can replace the pressure head 614 with different structures for different models of wall switches, enabling the assembly machine to adapt to the pressing requirements of various specifications of keypads and switch bases 100, thus improving the equipment's versatility. In practice, the rapid and stable driving force provided by the third cylinder 611 drives the pressure plate 613 and the pressure head 614 to descend, allowing the pressure head 614 to quickly reach the pressing position, shortening the pressing time and improving production efficiency. The guiding function of the guide rod 612 and the symmetrically arranged pressure head 614 ensure the stability of the pressure head 614 during the pressing process, so that the keypad is subjected to uniform force during the pressing process, which improves the pressing accuracy and stability, thereby improving the product qualification rate.

[0036] Continue as Figure 1 , Figure 4 As shown, specifically, the second Z-axis moving module 62 includes a first connecting plate 621 connected to the bracket 2, a second connecting plate 623 slidably connected to the first connecting plate 621 via a second slider 622, and a fourth cylinder 624 mounted on the bracket 2. A second slide rail 6211 is provided on the first connecting plate 621, and the second slider 622 is slidably connected to the second slide rail 6211. The lower end of the fourth cylinder 624 is connected to the second connecting plate 623. The fourth cylinder 624 serves as a power source, pushing the second connecting plate 623 vertically along the second slide rail 6211 of the first connecting plate 621 via a piston rod. The second connecting plate 623 is L-shaped, and a groove 6141 is provided inside the pressure head 614. The two sides of one end of the second connecting plate 623 are slidably connected to the grooves 6141 of the two pressure heads 614, respectively. In specific implementation, the L-shaped horizontal section of the second connecting plate 623 is provided with a guide protrusion, which is slidably connected to the slide groove 6141 on the inner side of the pressure head 614 through the guide protrusion, so as to transmit the vertical driving force to the pressure head 614. Among them, the third cylinder 611 of the first Z-axis moving module 61 is responsible for the rapid coarse adjustment of the large stroke, which sends the pressure head 614 to the pre-pressing position; the fourth cylinder 624 of the second Z-axis moving module 62 is responsible for the high-precision pressing of the short stroke, and the final pressing is completed through the flexible compensation of the slide groove 6141.

[0037] As described above, the stable drive of the fourth cylinder 624, combined with the guiding effect of the second slide rail 6211, ensures the stability of the pressing head 614 when pressing vertically downwards. The sliding engagement between the slide groove 6141 and the guide boss of the L-shaped second connecting plate 623 allows the pressing head 614 to adapt to the slight positional deviation of the keypad, avoiding poor engagement or component damage caused by rigid contact. Positioning mold placement: The first positioning mold 3 is fixed on the bracket 2 and is used to place the switch base 100. The second positioning mold 53 is slidably connected to the first slide rail 511 on the base plate 51 via the first slider 52. Driven by the second cylinder 54, it is in the initial loading position. This position facilitates the operator to place the keypad material into the through hole 531 of the second positioning mold 53, and the through hole 531 serves to position the keypad.

[0038] The working principle of the assembly machine in this case is described in detail below, in conjunction with the full text:

[0039] Preparation phase: Both the first Z-axis moving module 61 and the second Z-axis moving module 62 are in their initial high positions. The piston rod of the third cylinder 611 of the first Z-axis moving module 61 retracts, causing the pressure plate 613 and the pressure head 614 to be positioned above; the piston rod of the fourth cylinder 624 of the second Z-axis moving module 62 is also in the retracted state, and the second connecting plate 623 is positioned above the second slide rail 6211.

[0040] First, the operator accurately places the switch base 100 to be installed into the stepped positioning groove 31 on the first positioning mold 3. Then, the equipment is started. The spring positioning mechanism 4 is activated, and the first cylinders 42 on both sides of the first positioning mold 3 drive the pressure plate 43 to move towards the switch base 100 on the first positioning mold 3 until the corresponding positioning hole 431 is opened into the corresponding spring 200. At this time, the positioning of the spring 200 is completed. After the spring 200 is positioned, the feeding mechanism 5 is activated, the second cylinder 54 is actuated, and its piston rod extends, pushing the second positioning mold 53 to move along the first slide rail 511 to above the first positioning mold 3. At this time, the button plate is located directly above the switch base 100. Then, the operator manually places the button plate into the through hole 531 of the second positioning mold 53. After the keypad is placed, the operator activates the pressing mechanism 6. Air is introduced into the third cylinder 611 of the first Z-axis moving module 61, and the piston rod extends, driving the pressure plate 613 and pressure head 614 to descend rapidly to the pre-pressing position via the guide rod 612. This stage is the initial pressing, quickly approaching the keypad. Next, the second Z-axis moving module 62 begins operation, air is introduced into the fourth cylinder 624, and the piston rod extends, pushing the second connecting plate 623 to slowly descend along the second slide rail 6211 on the first connecting plate 621. The horizontal section of the L-shaped second connecting plate 623 slides downwards along the groove 6141 inside the pressure head 614, allowing the pressure head 614 to accurately fit against the keypad surface and apply stable pressure, pressing the keypad onto the switch base 100, ensuring a tight snap-fit.

[0041] After pressing is completed, the fourth cylinder 624 of the second Z-axis moving module 62 exhausts air, the piston rod retracts, and the second connecting plate 623 and the pressing head 614 rise. Subsequently, the third cylinder 611 of the first Z-axis moving module 61 exhausts air, the piston rod retracts, and the pressing plate 613 and the pressing head 614 return to their initial high position. At the same time, the piston rod of the second cylinder 54 retracts, driving the second positioning mold 53 to reset along the first slide rail 511 to its initial loading position. The operator removes the installed wall switch from the first positioning mold 3, completing one assembly cycle. The above steps can then be repeated for the assembly of the next wall switch.

[0042] As stated above, this case protects a wall switch assembly machine, and all technical solutions that are the same as or similar to this case should be considered to fall within the scope of protection of this case.

Claims

1. A wall switch assembly machine, comprising a base (1) and a bracket (2) mounted on the base (1), characterized in that: The base (1) is equipped with a first positioning mold (3) and a spring positioning mechanism (4). The bracket (2) is connected to a feeding mechanism (5) and a pressing mechanism (6). The feeding mechanism (5) is located above the first positioning mold (3). There are two spring positioning mechanisms (4) symmetrically located at the left and right ends of the first positioning mold (3). The pressing mechanism (6) is suspended above the first positioning mold (3).

2. The wall switch assembly machine according to claim 1, characterized in that: The first positioning mold (3) is detachably connected to the base (1), and the first positioning mold (3) includes a recessed stepped positioning groove (31).

3. A wall switch assembly machine according to claim 1, characterized in that: The spring positioning mechanism (4) includes a support frame (41), a first cylinder (42) mounted on the upper end of the support frame (41), and a pressure plate (43) connected to the first cylinder (42). The pressure plate (43) has a positioning hole (431).

4. A wall switch assembly machine according to claim 1, characterized in that: The feeding mechanism (5) includes a base plate (51) connected to the bracket (2), a second positioning mold (53) slidably connected to the base plate (51) via a first slider (52), and a second cylinder (54) connected to the front end of the second positioning mold (53). The base plate (51) is provided with a first slide rail (511), the first slider (52) is slidably connected to the first slide rail (511), and the second positioning mold (53) is provided with a through hole (531).

5. A wall switch assembly machine according to claim 1, characterized in that: The pressing mechanism (6) includes a first Z-axis moving module (61) and a second Z-axis moving module (62) that is connected to the first Z-axis moving module (61) in a transmission manner. The second Z-axis moving module (62) is disposed at the front end of the first Z-axis moving module (61).

6. A wall switch assembly machine according to claim 5, characterized in that: The first Z-axis moving module (61) includes a third cylinder (611) mounted on a bracket (2), a pressure plate (613) connected to the lower end of the third cylinder (611) via a guide rod (612), and a detachable pressure head (614) connected to the lower end of the pressure plate (613). Two pressure heads (614) are symmetrically arranged.

7. A wall switch assembly machine according to claim 6, characterized in that: The second Z-axis moving module (62) includes a first connecting plate (621) connected to the bracket (2), a second connecting plate (623) slidably connected to the first connecting plate (621) via a second slider (622), and a fourth cylinder (624) mounted on the bracket (2). The lower end of the fourth cylinder (624) is connected to the second connecting plate (623). A second slide rail (6211) is provided on the first connecting plate (621). The second slider (622) is slidably connected to the second slide rail (6211). The second connecting plate (623) is L-shaped. A groove (6141) is provided on the inner side of the pressing head (614). The two sides of one end of the second connecting plate (623) are slidably connected to the grooves (6141) of the two pressing heads (614).

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