An online PCB separator detection and pressure frame wheel mechanism

Abstract

This utility model discloses an online PCB depaneling machine detection and edge pressing wheel mechanism, belonging to the technical field of PCB depaneling machine auxiliary equipment. It includes a positioning and fixing frame and a detection-type single-sided edge pressing mechanism. Two sets of detection-type single-sided edge pressing mechanisms and two sets of positioning and fixing frames are symmetrically distributed front and back. The detection-type single-sided edge pressing mechanism is connected to the upper end of the positioning and fixing frame. Each detection-type single-sided edge pressing mechanism includes a detection-type edge pressing mechanism, an edge pressing wheel support, and a protective cover. The edge pressing wheel support is fixedly connected to the upper end of the positioning and fixing frame. The detection-type edge pressing mechanism is used to press the edge of the PCBA while simultaneously detecting whether the PCBA passes through. The protective cover is fixedly connected to the edge pressing wheel support and provides dust protection and protection for the detection-type edge pressing mechanism. Through this method, the detection and edge pressing functions are integrated. Furthermore, the accuracy of detection and the versatility of edge pressing are improved through the swing adjustment component and the limiting component.

Description

Technical Field

[0001] This utility model relates to the field of auxiliary equipment technology for PCB depaneling machines, specifically to an online PCB depaneling machine detection and pressure frame wheel mechanism. Background Technology

[0002] A board separation machine is an automated device that separates multiple PCBs or PCBAs from a panel into single boards. It is widely used in the electronics manufacturing industry and other fields to ensure that PCBAs are not damaged during the separation process, thereby improving product production efficiency and yield.

[0003] To ensure its high efficiency and stability, the depaneling machine is usually equipped with a variety of auxiliary devices, such as edge pressing auxiliary devices and related testing devices. However, in the existing technology, these two devices are often separate. The sensors for detecting the PCBA frame are often limited by size, detection range and detection distance, which often leads to difficulties in selecting the installation position and detection failure.

[0004] Based on this, this utility model designs an online PCB splitter detection and pressing frame wheel mechanism to solve the above problems. Utility Model Content

[0005] To address the aforementioned shortcomings of existing technologies, this utility model provides an online PCB depaneling machine detection and pressing frame wheel mechanism.

[0006] To achieve the above objectives, this utility model provides the following technical solution:

[0007] An online PCB depaneling machine detection and pressing edge wheel mechanism includes a positioning and fixing frame and a detection-type single-sided pressing mechanism. Two sets of detection-type single-sided pressing mechanisms and two sets of positioning and fixing frames are symmetrically distributed front and rear. The detection-type single-sided pressing mechanism is connected to the upper end of the positioning and fixing frame. The detection-type single-sided pressing mechanism includes a detection-type pressing mechanism, a pressing edge wheel support, and a protective cover. The pressing edge wheel support is fixedly connected to the upper end of the positioning and fixing frame. The detection-type pressing mechanism is connected to the pressing edge wheel support. The detection-type pressing mechanism is used to press the edge of the PCBA and detect whether the PCBA passes through. Simultaneously, the detection-type pressing mechanism can also detect the length of the PCBA. The protective cover is fixedly connected to the pressing edge wheel support and provides dustproof and protective effects for the detection-type pressing mechanism.

[0008] Furthermore, the detection-type edge pressing mechanism includes an adaptive edge pressing component, a swing control component, a pass detection component, and an encoder. The adaptive edge pressing component, the swing control component, and the pass detection component are all connected to the edge pressing wheel support. The encoder is connected to the adaptive edge pressing component. The encoder is used to detect the length of the PCBA that passes through. The swing control component is used to precisely control the edge pressing swing range of the adaptive edge pressing component. The pass detection component is used to detect whether a PCBA has passed through.

[0009] Furthermore, the adaptive edge pressing assembly includes an edge pressing wheel, a rocker arm, and a rotating shaft. One end of the rotating shaft is fixedly connected to the inner wall of the edge pressing wheel support, and the other end of the rotating shaft is rotatably connected to the rocker arm. The edge pressing wheel is rotatably connected to the rocker arm inside the two sets of positioning and fixing frames. The edge pressing wheel is used to roll the edge pressing PCBA. The stator of the encoder is fixedly connected to the right end of the rocker arm. The rotor of the encoder is fixedly connected to the edge pressing wheel through the rotating shaft. The encoder is electrically connected to the external control system.

[0010] Furthermore, the detection components include a sensing column, a sensor, and a detection plate. One end of the detection plate near the pressure frame wheel is fixedly connected to the rocker arm, and the other end of the detection plate is fixedly connected to the sensing column. The sensor is fixedly connected to the right wall of the pressure frame wheel support. The sensor is used to detect whether the sensing column has moved, and the sensor is electrically connected to the external control system.

[0011] Furthermore, the swing amplitude control component adopts a rocker arm limiting component, which includes a first spring and a first limiting post. The lower end of the first spring is fixedly connected to the rocker arm, and the upper end of the first spring is fixedly connected to the inner wall of the pressure frame wheel support. A first limiting groove is provided on the rocker arm for limiting one end of the first limiting post, and the other end of the first limiting post is fixedly connected to the inner wall of the pressure frame wheel support. The first limiting groove is used to precisely control the swing range of the rocker arm.

[0012] Furthermore, the swing amplitude control component adopts an adjustable rocker limit component, which includes a rocker angle adjustment component and a spring height adjustment component. The rocker angle adjustment component is connected to the pressure frame wheel support, and the rocker angle adjustment component is connected to the rocker. The spring height adjustment component is connected to the rocker and the pressure frame wheel support respectively.

[0013] Furthermore, the rocker angle adjustment assembly includes an adjustment cam, a fixed post, and a second limiting post. The end of the fixed post away from the rocker is fixedly connected to the inner wall of the pressure frame wheel support. The two sets of adjustment cams are provided with fixing holes for the fixed post to pass through. The two sets of fitting adjustment cams are rotatably connected to the fixed post. The adjustment cams are fixedly connected to the fixed post by a first fixing member. The adjustment cams are provided with fixing grooves for fixing the two sets of adjustment cams. The two sets of adjustment cams are fixedly connected by a second fixing member. The adjustment cams are provided with a second limiting groove for limiting the sliding of one end of the second limiting post. The other end of the second limiting post is fixedly connected to the rocker.

[0014] Furthermore, the spring height adjustment assembly includes an adjustment block, a threaded rod, and a second spring. The lower end of the second spring is fixedly connected to the rocker arm, and the upper end of the second spring is rotatably connected to the adjustment block. The threaded rod is fixedly connected to the upper end of the adjustment block and is threadedly connected to the pressure frame wheel support.

[0015] Compared with the prior art, the advantages of this utility model are as follows: 1. By optimizing the mechanical structure and the cooperation between the components, the functions of detection, length detection and edge pressing are integrated, while the structure is compact, easy to install and convenient to use;

[0016] 2. The swing angle of the rocker arm is precisely controlled by the swing amplitude adjustment component and the limit component, avoiding detection errors and mechanical failures caused by excessive swing, which further improves the accuracy and stability of the detection. At the same time, it also makes the pressing frame wheel compatible with PCBAs of different thicknesses, making the equipment highly versatile.

[0017] 3. It has a high accuracy rate in detecting whether the PCBA has passed the test, and the sensor is equipped with a protective cover to ensure its safety and stability. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a perspective view of an online PCB depaneling machine detection and pressing frame wheel mechanism according to the present invention;

[0020] Figure 2 This is a front view of an online PCB depaneling machine detection and pressing frame wheel mechanism according to the present invention;

[0021] Figure 3 This is a perspective view of the detection-type single-sided pressing mechanism of this utility model;

[0022] Figure 4 A perspective view of the detection-type single-sided pressing mechanism of this utility model without the protective cover;

[0023] Figure 5 This is a three-dimensional structural diagram of the adaptive edge pressing component according to Embodiment 1 of this utility model;

[0024] Figure 6 This is a three-dimensional structural diagram of the adaptive edge pressing component according to Embodiment 2 of this utility model.

[0025] The labels in the diagram represent:

[0026] 1. PCBA; 2. Detection-type edge pressing mechanism; 21. Adaptive edge pressing assembly; 211. Edge pressing wheel; 212. Rocker arm; 213. Rotation shaft; 22. Rocker arm limiting assembly; 221. First spring; 222. First limiting post; 223. First limiting groove; 23. Through detection assembly; 231. Sensing post; 232. Sensor; 233. Detection plate; 24. Encoder; 3. Adjustable rocker arm limiting assembly; 31. Rocker arm angle adjustment assembly; 311. Adjusting cam; 312. Second limiting groove; 313. Fixing groove; 314. Fixing hole; 315. Fixing post; 316. Second limiting post; 32. Spring height adjustment assembly; 321. Adjusting block; 322. Threaded rod; 323. Second spring; 4. Positioning and fixing frame; 5. Edge pressing wheel support; 6. Protective cover. Detailed Implementation

[0027] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without creative effort are within the scope of protection of this utility model.

[0028] The terms "left," "right," "front," "back," "up," and "down" used in the following description refer to the orientation from the perspective of the front view.

[0029] Example 1: In some embodiments, please refer to the accompanying drawings. Figures 1-6 An online PCB depaneling machine detection and pressing edge wheel mechanism includes a positioning and fixing frame 4 and a detection-type single-sided pressing mechanism. The two sets of detection-type single-sided pressing mechanisms and the two sets of positioning and fixing frames 4 are symmetrically distributed front and back. The detection-type single-sided pressing mechanism is connected to the upper end of the positioning and fixing frame 4.

[0030] The detection-type single-sided edge pressing mechanism includes a detection-type edge pressing mechanism 2, an edge pressing wheel support 5, and a protective cover 6. The edge pressing wheel support 5 is fixedly connected to the upper end of the positioning and fixing frame 4. The detection-type edge pressing mechanism 2 is connected to the edge pressing wheel support 5. The detection-type edge pressing mechanism 2 is used to press the edge of PCBA1 and detect whether PCBA1 passes through. At the same time, the detection-type edge pressing mechanism 2 can also detect the length of PCBA1. The protective cover 6 is fixedly connected to the edge pressing wheel support 5. The protective cover 6 is used to provide dustproof and protective effects for the detection-type edge pressing mechanism 2.

[0031] The detection-type edge pressing mechanism 2 includes an adaptive edge pressing component 21, a swing control component, a pass detection component 23, and an encoder 24. The adaptive edge pressing component 21, the swing control component, and the pass detection component 23 are all connected to the edge pressing wheel support 5. The encoder 24 is connected to the adaptive edge pressing component 21. The encoder 24 is used to detect the length of the passing PCBA1. The swing control component is used to precisely control the edge pressing swing range of the adaptive edge pressing component 21. The pass detection component 23 is used to detect whether a PCBA1 has passed.

[0032] The adaptive edge pressing assembly 21 includes an edge pressing wheel 211, a rocker arm 212, and a rotating shaft 213. One end of the rotating shaft 213 is fixedly connected to the inner wall of the edge pressing wheel support 5, and the other end of the rotating shaft 213 is rotatably connected to the rocker arm 212. The edge pressing wheel 211 is rotatably connected to the rocker arm 212 on the inner side of the two sets of positioning and fixing frames 4. The edge pressing wheel 211 is used to roll the edge pressing PCBA1. The stator of the encoder 24 is fixedly connected to the right end of the rocker arm 212. The rotor of the encoder 24 is fixedly connected to the edge pressing wheel 211 through the rotating shaft. The encoder 24 is electrically connected to the external control system.

[0033] The swing amplitude control component can use a rocker limit component 22 or an adjustable rocker limit component 3 to control the swing amplitude of the rocker 212.

[0034] The detection assembly 23 includes a sensing column 231, a sensor 232, and a detection plate 233. One end of the detection plate 233 near the pressure frame wheel 211 is fixedly connected to the rocker arm 212, and the other end of the detection plate 233 is fixedly connected to the sensing column 231. The sensor 232 is fixedly connected to the right wall of the pressure frame wheel support 5. The sensor 232 is used to detect whether the sensing column 231 has moved. The sensor 232 is electrically connected to an external control system.

[0035] In this invention, two sets of positioning and fixing frames 4 are respectively installed on both sides of the belt conveyor of the PCB separator. The distance between the two sets of positioning and fixing frames 4 can be adjusted according to the width of the PCBA1, so that the lower ends of the two sets of pressing frame rollers 211 are directly opposite the front and rear side frames of the PCBA1. When the PCBA1 is moved to the underside of the pressing frame rollers 211 by the belt conveyor, the upper surface of the PCBA1 rolls in contact with the pressing frame rollers 211. Due to the thickness of the PCBA1, the pressing frame rollers 211 move upward. Under the limiting action of the rocker arm 212 and the rotating shaft 213, the pressing frame rollers 211 can only rotate around the rotating shaft 213. 13 makes a circular motion around the center. The swing amplitude control component is used to control the swing amplitude of the pressing frame wheel 211, so that the depaneling machine can adapt to the inspection requirements of different specifications of PCBA1. During the passage of PCBA1, the pressing frame wheel 211 moves upward, which drives the rocker arm 212 to move upward. The rocker arm 212 moves upward, which drives the sensing column 231 to move upward. The sensor 232 can detect whether the sensing column 231 has moved upward, and thus detect whether PCBA1 has passed. The encoder 24 can record the rotation distance L1 of the pressing frame wheel 211. By comparing L1 with the length of the standard part of PCBA1, it can be determined whether a problem has occurred.

[0036] A protective cover 6 is installed on the outside of the sensor 232 and the encoder 24, which can effectively prevent dust, debris or other foreign objects in the external environment from interfering with and damaging them, thereby improving the reliability and lifespan of the detection system. This protective design not only protects the sensor 232 and the encoder 24 from mechanical damage, but also avoids potential safety hazards caused by the exposure of the sensor 232 and the encoder 24, ensuring that the equipment can operate stably in complex industrial environments.

[0037] Example 2: In some embodiments, such as Figure 5 As shown, in a preferred embodiment of the present invention, the swing amplitude control component adopts a rocker arm limiting component 22.

[0038] The rocker arm limiting assembly 22 includes a first spring 221 and a first limiting post 222. The lower end of the first spring 221 is fixedly connected to the rocker arm 212, and the upper end of the first spring 221 is fixedly connected to the inner wall of the pressure frame wheel support 5. A first limiting groove 223 is provided on the rocker arm 212 for limiting one end of the first limiting post 222. The other end of the first limiting post 222 is fixedly connected to the inner wall of the pressure frame wheel support 5. The first limiting groove 223 is used to precisely control the swing range of the rocker arm 212.

[0039] In this invention, when PCBA1 passes under the pressure plate wheel 211, the pressure plate wheel 211 moves upward, causing the first spring 221 to be compressed. Therefore, the first spring 221 can provide a restoring force so that the pressure plate wheel 211 is always in contact with the upper end of PCBA1. The upper and lower ends of the first limiting groove 223 are the highest and lowest points where the rocker arm 212 can swing, respectively, thereby controlling the swing amplitude of the pressure plate wheel 211. This swing amplitude control structure is compatible with PCBA1 with a board thickness of 0.5mm-4mm and can be applied to the testing needs of products of different specifications, improving the versatility and practicality of the equipment.

[0040] Example 3: In some embodiments, such as Figure 6 As shown, in a preferred embodiment of this utility model, the swing amplitude control component adopts an adjustable rocker limit component 3.

[0041] The adjustable rocker arm limiting assembly 3 includes a rocker arm angle adjusting assembly 31 and a spring height adjusting assembly 32. The rocker arm angle adjusting assembly 31 is connected to the pressure frame wheel support 5 and the rocker arm 212. The spring height adjusting assembly 32 is connected to the rocker arm 212 and the pressure frame wheel support 5 respectively.

[0042] The rocker angle adjustment assembly 31 includes an adjustment cam 311, a fixed post 315, and a second limiting post 316. The end of the fixed post 315 away from the rocker 212 is fixedly connected to the inner wall of the pressure frame wheel support 5. The two sets of adjustment cams 311 are provided with fixing holes 314 for the fixed post 315 to pass through. The two sets of fitting adjustment cams 311 are rotatably connected to the fixed post 315. The adjustment cams 311 are fixedly connected to the fixed post 315 by a first fixing member. The adjustment cams 311 are provided with fixing grooves 313 for fixing the two sets of adjustment cams 311. The two sets of adjustment cams 311 are fixedly connected by a second fixing member. The adjustment cams 311 are provided with a second limiting groove 312 for limiting and sliding with one end of the second limiting post 316. The other end of the second limiting post 316 is fixedly connected to the rocker 212.

[0043] The first fixing component is a nut. The fixing post 315 is threaded, and the two sets of adjusting cams 311 are fixedly connected to the fixing post 315 by the nuts at both ends.

[0044] The second fixing component is a bolt and nut. The two sets of adjusting cams 311 are fixedly connected by passing the bolt through the fixing groove 313 and then fixing it with nuts at both ends.

[0045] The two sets of adjusting cams 311 are in contact, and the overlapping part of the two sets of second limiting grooves 312 is the swing range of the rocker arm 212. The swing range of the rocker arm 212 can be adjusted by adjusting the relative position of the two sets of adjusting cams 311.

[0046] The spring height adjustment assembly 32 includes an adjustment block 321, a threaded rod 322, and a second spring 323. The lower end of the second spring 323 is fixedly connected to the rocker arm 212, and the upper end of the second spring 323 is rotatably connected to the adjustment block 321. The threaded rod 322 is fixedly connected to the upper end of the adjustment block 321 and is threadedly connected to the pressure frame wheel support 5.

[0047] In this invention, when PCBA1 passes under the pressure plate wheel 211, the pressure plate wheel 211 moves upward, compressing the second spring 323. Therefore, the second spring 323 provides a restoring force, ensuring the pressure plate wheel 211 remains in contact with the upper end of PCBA1. Two sets of adjusting cams 311 are fixed to the pressure plate wheel support 5 via the fixing post 315, fixing hole 314, and nut. The size of the overlapping portion of the two sets of second limiting grooves 312 can be adjusted by adjusting the relative position between the two sets of adjusting cams 311. The upper and lower ends of the overlapping portion of the two sets of second limiting grooves 312 constitute the second limiting post 316. The rocker arm 212 can be adjusted by moving its highest and lowest points. After the swing amplitude is adjusted, the two sets of adjusting cams 311 are fixed by bolts passing through the fixing groove 313 and nuts at both ends. At the same time, the height of the threaded rod 322 can be adjusted by rotating the threaded rod 322, which in turn adjusts the height of the adjusting block 321, thereby adjusting the height of the second spring 323 and achieving the effect of adjusting the elastic force of the second spring 323. Through the cooperation of the above structures, the swing amplitude of the pressure frame wheel 211 is controlled. This swing amplitude control structure can be compatible with PCBA1 with a wider range of board thicknesses, further improving the versatility and practicality of the equipment.

[0048] The above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions will not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model.

Claims

1. An online PCB depaneling machine detection and pressing frame wheel mechanism, comprising a positioning and fixing frame (4), characterized in that: It also includes a detection-type single-sided pressing mechanism. The two sets of detection-type single-sided pressing mechanisms and the two sets of positioning and fixing frames (4) are symmetrically distributed front and back. The detection-type single-sided pressing mechanism is connected to the upper end of the positioning and fixing frame (4). The detection-type single-sided pressing mechanism includes a detection-type pressing mechanism (2), a pressing frame wheel support (5), and a protective cover (6). The pressing frame wheel support (5) is fixedly connected to the upper end of the positioning fixed frame (4). The detection-type pressing mechanism (2) is connected to the pressing frame wheel support (5). The detection-type pressing mechanism (2) is used to press the edge of the PCBA (1) and detect whether the PCBA (1) passes through. At the same time, the detection-type pressing mechanism (2) can also detect the length of the PCBA (1). The protective cover (6) is fixedly connected to the pressing frame wheel support (5). The protective cover (6) is used to provide dustproof and protective effects for the detection-type pressing mechanism (2). The detection-type edge pressing mechanism (2) includes an adaptive edge pressing component (21), a swing control component, a pass detection component (23), and an encoder (24). The adaptive edge pressing component (21), the swing control component, and the pass detection component (23) are all connected to the edge pressing wheel support (5). The encoder (24) is connected to the adaptive edge pressing component (21). The encoder (24) is used to detect the length of the PCBA (1) that passes through. The swing control component is used to precisely control the edge pressing swing range of the adaptive edge pressing component (21). The pass detection component (23) is used to detect whether a PCBA (1) has passed through. The adaptive edge pressing assembly (21) includes an edge pressing wheel (211), a rocker arm (212), and a rotating shaft (213). One end of the rotating shaft (213) is fixedly connected to the inner wall of the edge pressing wheel support (5), and the other end of the rotating shaft (213) is rotatably connected to the rocker arm (212). The edge pressing wheel (211) is rotatably connected to the rocker arm (212) on the inner side of the two sets of positioning and fixing frames (4). The edge pressing wheel (211) is used to roll the edge pressing PCBA (1). The stator of the encoder (24) is fixedly connected to the right end of the rocker arm (212). The rotor of the encoder (24) is fixedly connected to the edge pressing wheel (211) through the rotating shaft. The encoder (24) is electrically connected to the external control system. The detection assembly (23) includes a sensing column (231), a sensor (232), and a detection plate (233). One end of the detection plate (233) near the pressure frame wheel (211) is fixedly connected to the rocker arm (212), and the other end of the detection plate (233) is fixedly connected to the sensing column (231). The sensor (232) is fixedly connected to the right wall of the pressure frame wheel support (5). The sensor (232) is used to detect whether the sensing column (231) has moved. The sensor (232) is electrically connected to an external control system. The swing amplitude control component adopts a rocker arm limiting component (22). The rocker arm limiting component (22) includes a first spring (221) and a first limiting post (222). The lower end of the first spring (221) is fixedly connected to the rocker arm (212), and the upper end of the first spring (221) is fixedly connected to the inner wall of the pressure frame wheel support (5). A first limiting groove (223) is provided on the rocker arm (212) for limiting one end of the first limiting post (222). The other end of the first limiting post (222) is fixedly connected to the inner wall of the pressure frame wheel support (5). The first limiting groove (223) is used to precisely control the swing range of the rocker arm (212).

2. The online board scanner, kiss roll mechanism of claim 1, wherein, The swing amplitude control component adopts an adjustable rocker limit component (3). The adjustable rocker limit component (3) includes a rocker angle adjustment component (31) and a spring height adjustment component (32). The rocker angle adjustment component (31) is connected to the pressure frame wheel support (5), and the rocker angle adjustment component (31) is connected to the rocker (212). The spring height adjustment component (32) is connected to the rocker (212) and the pressure frame wheel support (5) respectively.

3. The on-line board scanner, kiss roll mechanism of claim 2, wherein, The rocker angle adjustment assembly (31) includes an adjustment cam (311), a fixed post (315), and a second limiting post (316). The end of the fixed post (315) away from the rocker (212) is fixedly connected to the inner wall of the pressure frame wheel support (5). The two sets of adjustment cams (311) are provided with fixing holes (314) for the fixed post (315) to pass through. The two sets of fitting adjustment cams (311) are rotatably connected to the fixed post (315). The adjustment cams (311) are fixedly connected to the fixed post (315) by the first fixing member. The adjustment cams (311) are provided with fixing grooves (313) for fixing the two sets of adjustment cams (311). The two sets of adjustment cams (311) are fixedly connected by the second fixing member. The adjustment cams (311) are provided with a second limiting groove (312) for limiting the sliding of one end of the second limiting post (316). The other end of the second limiting post (316) is fixedly connected to the rocker (212).

4. The on-line board scanner, kiss roll mechanism of claim 3 wherein, The spring height adjustment assembly (32) includes an adjustment block (321), a threaded rod (322), and a second spring (323). The lower end of the second spring (323) is fixedly connected to the rocker arm (212), and the upper end of the second spring (323) is rotatably connected to the adjustment block (321). The threaded rod (322) is fixedly connected to the upper end of the adjustment block (321), and the threaded rod (322) is threadedly connected to the pressure frame wheel support (5).

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