A shock-absorbing pad for a diesel pile driver

Abstract

This utility model relates to the field of shock-absorbing pad technology and discloses a shock-absorbing pad for a diesel pile hammer, including a shock-absorbing fixing mechanism, a connecting mechanism, a first buffer pad, and a second buffer pad. The shock-absorbing fixing mechanism has connecting mechanisms at both ends. In this utility model, the device uses the collision between the pile hammer and the pile frame to press down the second pressure plate. When the first buffer pad is compressed, it causes the first elastic telescopic rod to contract to absorb the main impact force. Simultaneously, the folding bracket, when compressed, slides along the slide rail and stretches the second elastic telescopic rod to disperse the remaining impact. During the pressing process, the slide rod slides towards the center along the slide bar with the displacement of the second pressure plate, causing the pressure block to fix the first buffer pad. The second buffer pad surrounding the first buffer pad is guided vertically downward by the groove trajectory to prevent deflection. This design achieves efficient shock absorption while ensuring stable fixing of the shock-absorbing pad, reducing tilting and collapse, thereby extending service life and improving the practicality of the device.

Description

Technical Field

[0001] This utility model relates to the field of shock-absorbing pad technology, and in particular to a shock-absorbing pad for a diesel pile driver. Background Technology

[0002] A shock-absorbing pad for a diesel pile hammer is a device specifically designed to buffer and absorb the impact and vibration generated during the operation of a diesel pile hammer. It is usually installed between the pile hammer and the pile frame or pile cap. Its main functions are to protect the equipment, improve construction efficiency, and reduce the impact on the surrounding environment.

[0003] However, most shock absorbers are mainly composed of highly elastic rubber materials, with some composite materials. Due to the relatively simple material composition, their shock absorption effect is slightly worse than that of shock absorbers based on springs. They are prone to tilting and collapsing in a short period of time, which greatly shortens their service life and requires early replacement. Frequent replacement increases construction costs and reduces the practicality of the shock absorbers.

[0004] Therefore, those skilled in the art have provided a shock-absorbing pad for diesel pile hammers to solve the problems mentioned in the background art. Utility Model Content

[0005] The purpose of this invention is to address the shortcomings of existing technologies by proposing a shock-absorbing pad for a diesel pile hammer. The device utilizes the collision between the pile hammer and the pile frame to compress the first buffer pad on the second bearing plate. Under pressure, the second bearing plate moves downward, causing multiple first elastic telescopic rods to contract and absorb most of the downward impact force. Simultaneously, the folding bracket also folds under pressure. One end of the bracket slides along the outer wall of the slide rail, and in conjunction with the second elastic telescopic rods fixedly connected to both ends of the bracket, it stretches under pressure, thereby absorbing the remaining downward impact force. Multiple sliding rods located on the connecting rod and rotatably connected to the rotating part slide towards the middle of the upper surface of the second bearing plate due to the displacement of the second bearing plate when pressed down. At the same time, the pressure block fixedly connected to the sliding rod also presses down to clamp and fix the lower end of the first buffer pad. While the first buffer pad is fixed and moves down, the second buffer pad surrounds the first buffer pad around its lower end and restricts its vertical downward movement along the groove trajectory without deflection. In this way, while achieving the shock absorption effect, the shock absorption pad is fixed to reduce the degree of skew and collapse, improves the service life of the shock absorption pad, and thus enhances the practicality of the device.

[0006] To achieve the above objectives, the present invention provides the following technical solution: A vibration damping pad for a diesel pile hammer includes a vibration damping fixing mechanism, a connecting mechanism, a first buffer pad, and a second buffer pad. The vibration damping fixing mechanism has connecting mechanisms at both ends. A first buffer pad is located on the upper surface of the vibration damping fixing mechanism, and a second buffer pad is located on the lower surface. The vibration damping fixing mechanism includes two first pressure plates. A first elastic telescopic rod is fixedly connected to both ends of the upper surface of each of the two first pressure plates. A second pressure plate is fixedly connected to the upper end of every two first elastic telescopic rods. A slide rail is fixedly connected to the middle of the upper surface of each of the two first pressure plates. A folding bracket is slidably connected to one side of the outer wall of each of the two slide rails. Both ends of the two folding brackets are fixedly connected... The system is connected by a transition section. A second elastic telescopic rod is fixedly connected to one end face of each pair of transition sections. A connecting rod is fixedly connected to one end face of each pair of transition sections. Two threaded rods are fixedly connected to one side of the outer wall of each of the two connecting rods. Threaded sleeves are threadedly connected to the outer walls of the multiple threaded rods. A rotating part is rotatably connected to one end of each of the multiple threaded sleeves. A sliding rod is rotatably connected to one end of each of the multiple rotating parts. A pressure block is fixedly connected to one end of each of the multiple sliding rods. A through-hole is opened in the middle of one end face of each of the two first pressure plates and the second pressure plate. A sliding bar is fixedly connected to both ends of each of the two first pressure plates. Two insertion slots are opened on one side of the upper end face of each of the two second pressure plates. Through the above technical solution, the device compresses the first buffer pad on the second bearing plate by the collision between the pile hammer and the pile frame. When compressed, the second bearing plate moves downward, causing multiple first elastic telescopic rods to contract and absorb most of the impact force during the downward pressure. At the same time, the folding bracket also folds under pressure. One end of the bracket slides on one side of the outer wall of the slide rail and, together with the second elastic telescopic rods fixedly connected at both ends of the bracket, stretches when compressed, thereby absorbing the remaining impact force during the downward pressure. At this time, multiple sliding rods located on the connecting rod and rotatably connected to the rotating part slide towards the middle of the upper surface of the second bearing plate due to the displacement of the second bearing plate during the downward pressure. The pressure block fixedly connected to the sliding rod also presses down at the same time to clamp and fix the lower end of the first buffer pad. While the first buffer pad is fixed and moves downward, the second buffer pad surrounds the first buffer pad and its lower end, restricting it from moving vertically downward along the groove trajectory without deflection. Thus, while achieving the shock absorption effect, the shock absorption pad is fixed to reduce the degree of tilting and collapse, improves the service life of the shock absorption pad, and thus enhances the practicality of the device.

[0007] Furthermore, the connecting mechanism includes multiple first fixing blocks, and a second fixing block is fixedly connected to one end of one side face of each of the two first pressure plates and the second pressure plate. A pressure rod is slidably connected to one side face of each of the multiple first fixing blocks. A spring is sleeved on the upper end of the outer wall of each of the multiple pressure rods. An insertion rod is rotatably connected to one end of each of the multiple pressure rods. A locking block is fixedly connected to both sides of the outer wall of each of the multiple insertion rods. Through the above technical solution, the device first completes the initial installation between the pile hammer and the pile frame through the interference fit between the two first and second pressure plates. Then, the pressure rod on the first fixed block set on the two types of pressure plates is pressed, which compresses the spring between the pressure rod and the first fixed block, and causes the pressure rod to extend further into the first fixed block until it passes through the second fixed block. Then, the insertion rod is rotated so that the locking block on it is close to the second fixed block. Finally, the pressure rod is released and the spring tension is used to tightly fit the locking block into the groove of the second fixed block. Finally, the first and second buffer pads are installed, thereby completing the convenient installation of the shock-absorbing pad, improving the installation efficiency of the shock-absorbing pad, and thus improving the practicality of the device.

[0008] Furthermore, the lower end of each of the two folding brackets is fixedly connected to one end of the slide rail; Through the above technical solution, this design enables the folding bracket to withstand pressure in a timely manner while maintaining stability.

[0009] Furthermore, the inner center of each of the multiple sliding rods is slidably connected to the sliding bar, and each pair of pressure blocks is engaged with the lower end of the first buffer pad; Through the above technical solution, this arrangement enables the slide bar to move on the slide bar by changing its position when the second pressure plate moves down, so that the pressure block set on it can fix the first buffer pad.

[0010] Furthermore, both of the connecting rods are connected by an interference fit, and the basic connection between the two first pressure plates and the second pressure plate is also an interference fit. Through the above technical solution, the interference fit between the two first bearing plates and the second bearing plate enables the device to complete the initial installation between the pile hammer and the pile frame.

[0011] Furthermore, the upper end of the first pressure plate and the lower end of the second buffer pad form an interference fit; Through the above technical solution, this setting allows the second buffer pad to be installed quickly without losing its limiting and protective function for the first buffer pad.

[0012] Furthermore, two of the first fixing blocks are fixedly connected to both ends of one side of the second pressure plate, and the other two first fixing blocks are fixedly connected to both ends of one side of the first pressure plate. The above technical solution makes the two pressure plates more stable when the two fixing blocks are locked, based on the interference fit.

[0013] Furthermore, two of the second fixing blocks are fixedly connected to both ends of one side of the second pressure plate, and the other two second fixing blocks are fixedly connected to both ends of one side of the first pressure plate; Through the above technical solution, this setting makes the two pressure plates more stable and able to limit and fix the blocks when the two fixing blocks are locked, based on the interference fit.

[0014] This utility model has the following beneficial effects: 1. This utility model proposes a shock-absorbing pad for a diesel pile hammer. The device compresses the first buffer pad on the second bearing plate through the collision between the pile hammer and the pile frame. When compressed, the second bearing plate moves downward, causing multiple first elastic telescopic rods to contract and absorb most of the impact force during the downward pressure. At the same time, the folding bracket also folds under pressure. One end of the bracket slides on one side of the outer wall of the slide rail and, together with the second elastic telescopic rods fixedly connected to both ends of the bracket, stretches under pressure, thereby absorbing the remaining impact force. At this time, multiple sliding rods located on the connecting rod and rotatably connected to the rotating part slide towards the middle of the upper surface of the second bearing plate due to the displacement of the second bearing plate during the downward pressure. The pressure block fixedly connected to the sliding rod also presses down at the same time, clamping and fixing the lower end of the first buffer pad. While the first buffer pad is fixed and moves downward, the second buffer pad surrounds the first buffer pad and its lower end, restricting its vertical downward movement along the groove trajectory without deflection. Thus, while achieving the shock absorption effect, the shock-absorbing pad is fixed to reduce the degree of tilting and collapse, improving the service life of the shock-absorbing pad and thus enhancing the practicality of the device.

[0015] 2. The present invention proposes a shock-absorbing pad for a diesel pile hammer. The device first completes the initial installation between the pile hammer and the pile frame through the interference fit between two first and second bearing plates. Then, the pressure rod on the first fixing block set on the two types of bearing plates is pressed, which compresses the spring between the pressure rod and the first fixing block, and causes the pressure rod to extend further into the first fixing block until it passes through the second fixing block. Then, the insertion rod is rotated so that the locking block on it is close to the second fixing block. Finally, the pressure rod is released and the spring tension is used to tightly fit the locking block into the groove of the second fixing block. Finally, the first and second buffer pads are installed, thereby completing the convenient installation of the shock-absorbing pad, improving the installation efficiency of the shock-absorbing pad, and thus improving the practicality of the device. Attached Figure Description

[0016] Figure 1 This is an isometric view of a shock-absorbing pad for a diesel pile hammer proposed in this utility model; Figure 2 This is a schematic diagram of the slide rail for a shock-absorbing pad for a diesel pile hammer proposed in this utility model; Figure 3 for Figure 2 Enlarged view of point A; Figure 4 This is a schematic diagram of a threaded sleeve for a shock-absorbing pad used in a diesel pile hammer, as proposed in this utility model. Figure 5This is a schematic diagram of the connecting rod of a shock-absorbing pad for a diesel pile hammer proposed in this utility model; Figure 6 for Figure 4 Enlarged view of point B; Figure 7 This is a front view of a shock-absorbing pad for a diesel pile hammer proposed in this utility model; Figure 8 This is an exploded view of the first and second buffer pads of the shock-absorbing pad for a diesel pile hammer proposed in this utility model. Figure 9 This is a schematic diagram of the first and second buffer pads of a shock-absorbing pad for a diesel pile hammer proposed in this utility model. Figure 10 This is a schematic diagram of the threaded sleeve and rotating part of a shock-absorbing pad for a diesel pile hammer proposed in this utility model.

[0017] Legend: 1. Shock-absorbing fixing mechanism; 101. First pressure plate; 102. First elastic telescopic rod; 103. Second pressure plate; 104. Slide rail; 105. Folding bracket; 106. Adapter; 107. Second elastic telescopic rod; 108. Connecting rod; 109. Threaded rod; 110. Threaded sleeve; 111. Slide rod; 112. Pressure block; 113. Through port; 114. Slide bar; 115. Insertion groove; 116. Rotating part; 2. Connecting mechanism; 201. First fixing block; 202. Second fixing block; 203. Pressure rod; 204. Spring; 205. Insertion rod; 206. Locking block; 3. First buffer pad; 4. Second buffer pad. Detailed Implementation

[0018] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of specific embodiments. Obviously, the described specific embodiments are only a part of the specific embodiments of the present invention, and not all of them. Based on the specific embodiments of the present invention, all other specific embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0019] Reference Figure 1-3 One specific embodiment provided by this utility model: A vibration damping pad for a diesel pile hammer includes a vibration damping fixing mechanism 1, a connecting mechanism 2, a first buffer pad 3, and a second buffer pad 4. The vibration damping fixing mechanism 1 has connecting mechanisms 2 at both ends. The upper end face of the vibration damping fixing mechanism 1 has a first buffer pad 3, and the lower end face has a second buffer pad 4. The vibration damping fixing mechanism 1 includes two first pressure plates 101. First elastic telescopic rods 102 are fixedly connected to both ends of the upper end faces of the two first pressure plates 101. A second pressure plate 103 is fixedly connected to the upper end of every two first elastic telescopic rods 102. A slide rail 104 is fixedly connected to the middle of the upper end faces of the two first pressure plates 101. The outer walls of the two slide rails 104... Each side is slidably connected to a folding bracket 105. Both ends of each folding bracket 105 are fixedly connected to a transition part 106. A second elastic telescopic rod 107 is fixedly connected to one end face of each pair of transition parts 106. A connecting rod 108 is fixedly connected to one end face of each pair of transition parts 106. Two threaded rods 109 are fixedly connected to one side of the outer wall of each connecting rod 108. Threaded sleeves 110 are threadedly connected to the outer walls of each threaded rod 109. A rotating part 116 is rotatably connected to one end of each threaded sleeve 110. A sliding rod 111 is rotatably connected to one end of each rotating part 116. A pressure block 112 is fixedly connected to one end of each sliding rod 111. Two first pressure plates 101... A through-hole 113 is provided in the middle of one end face of the second bearing plate 103. Sliding rods 114 are fixedly connected to both ends of the two first bearing plates 101. Two insertion slots 115 are provided on one side of the upper end face of the two second bearing plates 103. The device compresses the first buffer pad 3 on the second bearing plate 103 through the collision between the pile hammer and the pile frame. When compressed, the second bearing plate 103 moves downward, causing multiple first elastic telescopic rods 102 to contract and absorb most of the impact force during downward compression. Simultaneously, the folding bracket 105 also folds under pressure. One end of the bracket slides on one side of the outer wall of the slide rail 104 and, in conjunction with the second elastic telescopic rods 107 fixedly connected to both ends of the bracket, stretches under pressure, thereby... The remaining downward impact force is absorbed. At this time, multiple sliding rods 111 located on the connecting rod 108 and rotatably connected to the rotating part 116 slide on the sliding rod 114 towards the middle of the upper end face of the second pressure plate 103 due to the displacement of the second pressure plate 103 during the downward pressure. The pressure block 112 fixedly connected to the sliding rod 111 also presses down at the same time to clamp and fix the lower end of the first buffer pad 3. While the first buffer pad 3 is fixed and moves down, the second buffer pad 4 surrounds the first buffer pad 3 and its lower end and restricts it from moving vertically downward along the groove trajectory without deflection. In this way, while achieving the shock absorption effect, the shock absorption pad is fixed to reduce the degree of tilting and collapse, improves the service life of the shock absorption pad, and thus improves the practicality of the device.

[0020] Reference Figure 3-5The connecting mechanism 2 includes multiple first fixing blocks 201. A second fixing block 202 is fixedly connected to one end of each of the two first pressure plates 101 and the second pressure plate 103. A pressure rod 203 is slidably connected to one end of each of the multiple first fixing blocks 201. A spring 204 is sleeved on the upper end of the outer wall of each of the multiple pressure rods 203. An insertion rod 205 is rotatably connected to one end of each of the multiple pressure rods 203. A locking block 206 is fixedly connected to both sides of the outer wall of each of the multiple insertion rods 205. The device first completes the initial installation between the pile hammer and the pile frame through the interference fit between the two first pressure plates 101 and the second pressure plate 103. Then, two types of... The pressure rod 203 on the first fixed block 201 on the pressure plate compresses the spring 204 between the pressure rod 203 and the first fixed block 201, causing the pressure rod 203 to extend further into the first fixed block 201 until it passes through the second fixed block 202. Then, the insertion rod 205 is rotated so that the locking block 206 on it is close to the second fixed block 202. Finally, the pressure rod 203 is released and the spring 204 pulls the locking block 206 tightly into the groove of the second fixed block 202. Finally, the first buffer pad 3 and the second buffer pad 4 are installed, thus completing the convenient installation of the shock-absorbing pad, improving the installation efficiency of the shock-absorbing pad, and thus improving the practicality of the device.

[0021] The lower end of each of the two folding brackets 105 is fixedly connected to one end of the slide rail 104. This arrangement allows the folding brackets 105 to withstand pressure in a timely manner and maintain stability.

[0022] The inner center of each of the multiple sliding rods 111 is slidably connected to the sliding bar 114, and each pair of pressure blocks 112 is engaged with the lower end of the first buffer pad 3. This arrangement allows the sliding rods 111 to move on the sliding bar 114 by changing their position when the second pressure plate 103 moves down, and the pressure blocks on them fix the first buffer pad 3.

[0023] Both connecting rods 108 are connected by an interference fit, and the basic connection between the two first bearing plates 101 and the second bearing plate 103 is also an interference fit. The interference fit between the two first bearing plates 101 and the second bearing plate 103 enables the device to complete the initial installation between the pile hammer and the pile frame.

[0024] The upper end of the first pressure plate 101 and the lower end of the second buffer pad 4 form an interference fit. This arrangement allows the second buffer pad 4 to be installed quickly without losing its limiting and protective function for the first buffer pad 3.

[0025] Two of the first fixing blocks 201 are fixedly connected to the two ends of one side face of the second pressure plate 103, and the other two first fixing blocks 201 are fixedly connected to the two ends of one side face of the first pressure plate 101. This arrangement makes the two pressure plates more stable on the basis of interference fit when the two fixing blocks are locked.

[0026] Two of the second fixing blocks 202 are fixedly connected to the two ends of one side of the second pressure plate 103, and the other two second fixing blocks 202 are fixedly connected to the two ends of one side of the first pressure plate 101. This arrangement makes the two pressure plates more stable on the basis of interference fit when the two fixing blocks are locked, and can play a limiting and fixing role for the locking block 206.

[0027] Working principle: The device compresses the first buffer pad 3 on the second pressure plate 103 through the collision between the pile hammer and the pile frame. When compressed, the second pressure plate 103 moves downward, causing multiple first elastic telescopic rods 102 to contract and absorb most of the impact force during the downward pressure. At the same time, the folding bracket 105 also folds under pressure. One end of the bracket slides on one side of the outer wall of the slide rail 104 and, together with the second elastic telescopic rods 107 fixedly connected at both ends of the bracket, stretches under pressure, thereby absorbing the remaining impact force during the downward pressure. At this time, multiple sliding rods 111 located on the connecting rod 108 and rotatably connected to the rotating part 116 slide on the sliding rod 114 towards the middle of the upper end face of the second pressure plate 103 due to the displacement of the second pressure plate 103 during the downward pressure. The pressure block 112 fixedly connected to the sliding rod 111 also presses down at the same time, clamping and fixing the lower end of the first buffer pad 3. The first buffer pad 3 is fixed. While the device is fixed and moving downward, the second buffer pad 4 surrounds the first buffer pad 3 around its lower end and restricts its vertical downward movement along the groove trajectory without deflection. The device first completes the initial installation between the pile hammer and the pile frame through the interference fit between the two first pressure plates 101 and the second pressure plate 103. Then, the pressure rod 203 on the first fixing block 201 set on the two types of pressure plates is pressed, so that the spring 204 between the pressure rod 203 and the first fixing block 201 is compressed, thereby causing the pressure rod 203 to extend further into the first fixing block 201 until it passes through the second fixing block 202. Then, the insertion rod 205 is rotated so that the locking block 206 on it is close to the second fixing block 202. Finally, the pressure rod 203 is released and the locking block 206 is tightly fitted into the groove of the second fixing block 202 by the tension of the spring 204. Finally, the first buffer pad 3 and the second buffer pad 4 are installed.

[0028] 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 specific embodiments, those skilled in the art can still modify the technical solutions described in the foregoing specific 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 shock absorbing pad for a diesel pile hammer, comprising a shock absorbing fixing mechanism (1), a connecting mechanism (2), a first cushion pad (3) and a second cushion pad (4), characterized in that: The shock-absorbing fixing mechanism (1) has a connecting mechanism (2) at both ends. The upper end face of the shock-absorbing fixing mechanism (1) is provided with a first buffer pad (3), and the lower end face of the shock-absorbing fixing mechanism (1) is provided with a second buffer pad (4). The shock-absorbing fixing mechanism (1) includes two first pressure plates (101). The upper end faces of the two first pressure plates (101) are fixedly connected to two first elastic telescopic rods (102). The upper end of each pair of first elastic telescopic rods (102) is fixedly connected to a second pressure plate (103). The middle of the upper end face of the two first pressure plates (101) is fixedly connected to a slide rail (104). The outer wall of each of the two slide rails (104) is slidably connected to one side of a folding bracket (105). The two ends of the two folding brackets (105) are fixedly connected to a transition part (106). The end face of each pair of transition parts (106) is fixedly connected to a first... Two elastic telescopic rods (107) are fixedly connected to one end face of each of the two connecting parts (106). Two threaded rods (109) are fixedly connected to one side of the outer wall of each of the two connecting rods (108). Threaded sleeves (110) are threadedly connected to the outer wall of each of the multiple threaded rods (109). Rotating parts (116) are rotatably connected to one end of each of the multiple threaded sleeves (110). Sliding rods (111) are rotatably connected to one end of each of the multiple rotating parts (116). Pressure blocks (112) are fixedly connected to one end of each of the multiple sliding rods (111). Through openings (113) are opened in the middle of one end face of each of the two first pressure plates (101) and the second pressure plate (103). Sliding rods (114) are fixedly connected to both ends of each of the two first pressure plates (101). Two insertion slots (115) are opened on one side of the upper end face of each of the two second pressure plates (103).

2. A shock pad for a diesel pile hammer as defined in claim 1, characterized in that: The connecting mechanism (2) includes multiple first fixing blocks (201), and a second fixing block (202) is fixedly connected to one end of one side face of the two first pressure plates (101) and the second pressure plate (103). A pressure rod (203) is slidably connected to one end face of the multiple first fixing blocks (201). A spring (204) is sleeved on the upper end of the outer wall of the multiple pressure rods (203). A plug rod (205) is rotatably connected to one end of the multiple pressure rods (203). A locking block (206) is fixedly connected to both sides of the outer wall of the multiple plug rods (205).

3. A shock pad for a diesel pile driver as defined in claim 1, characterized in that: The lower end of each of the two folding brackets (105) is fixedly connected to one end of the slide rail (104).

4. A shock pad for a diesel pile driver as defined in claim 1, characterized in that: The inner center of each of the multiple sliding rods (111) is slidably connected to the sliding bar (114), and each pair of pressure blocks (112) is engaged with the lower end of the first buffer pad (3).

5. A shock pad for a diesel pile driver as defined in claim 1, wherein: Both connecting rods (108) are connected by an interference fit, and the basic connection between the two first bearing plates (101) and the second bearing plate (103) is also an interference fit.

6. A shock pad for a diesel pile driver as defined in claim 1, wherein: The upper end of the first pressure plate (101) and the lower end of the second buffer pad (4) form an interference fit.

7. A shock pad for a diesel pile driver as defined in claim 2, wherein: Two of the first fixing blocks (201) are fixedly connected to the two ends of one side face of the second pressure plate (103), and the other two first fixing blocks (201) are fixedly connected to the two ends of one side face of the first pressure plate (101).

8. A shock pad for a diesel pile driver as defined in claim 2, wherein: Two of the second fixing blocks (202) are fixedly connected to the two ends of one side face of the second pressure plate (103), and the other two second fixing blocks (202) are fixedly connected to the two ends of one side face of the first pressure plate (101).

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