Hoist lifting apparatus for moving fitness equipment

Abstract

The utility model provides a hoist and lift equipment for fitness equipment movement relates to hoist and lift equipment technical field, including base, the lower extreme of pull rod is connected with the fixed connection of outer frame, the inner wall of outer frame is installed with second push, the inner wall of outer frame is close to the one end surface of second push, the inside of outer frame is provided with screw rod subassembly, screw rod subassembly includes screw rod and first push, one end inside of first push and second push all is set up with arc slot. The utility model first push and the distance between second push change flexibly, and then reach the installation pole of adaptation multiple specifications, first push moves and will be close to the fixed installation pole, and simultaneously because first push and the one end of second push are set up with arc slot, arc slot can close to the fixed installation pole of most circle, the one end surface of first push and second push still remains plane setting, like this can satisfy the installation pole close to the fixed of square and circle.

Description

Technical Field

[0001] This utility model relates to the field of hoisting and lifting equipment technology, and more specifically, to a hoisting and lifting device for moving fitness equipment. Background Technology

[0002] Social progress has significantly improved people's quality of life, with dietary needs largely met. However, this development has also brought drawbacks. The faster pace of life, increased work pressure, and overeating have negatively impacted health. More and more people are recognizing the importance of their health and are choosing to exercise at gyms, using fitness equipment to improve their physique and achieve a more toned body, making it popular among young people. During equipment assembly, some heavy mounting rods typically require lifting equipment to save effort during installation.

[0003] For example, application number CN201720938211.9 provides a hoisting and lifting device, including a base frame, a main boom hinged to the top of the base frame, and an auxiliary boom hinged to the front end of the main boom. The hinge axes between the main boom and the base frame, and between the auxiliary boom and the main boom, extend horizontally and are parallel to each other. The base frame is provided with a first control component that can drive the main boom to rotate around its hinge axis, and the main boom is provided with a second control component that can drive the auxiliary boom to rotate around its hinge axis. The front end of the auxiliary boom is provided with a suspension device. However, the above technical solution will encounter the following problems during use, such as difficulty in simultaneously fixing round and square mounting rods during hoisting, inability to adapt to mounting rods of various specifications, and affecting assembly efficiency. Therefore, we propose a hoisting and lifting device for moving fitness equipment to solve the above-mentioned problems. Utility Model Content

[0004] To address the limitations of existing technologies in simultaneously securing both round and square mounting rods during hoisting, and their inability to accommodate various rod sizes, which impacts assembly efficiency, this invention provides a hoisting and lifting device for moving fitness equipment.

[0005] To achieve the above objectives, the technical solution adopted by this utility model is as follows: A hoisting and lifting device for moving fitness equipment includes a base. A telescopic rod is slidably mounted on one end of the base. The base is U-shaped. A support rod is fixedly mounted on the upper surface of the base. An opening is provided inside the upper end of the support rod, and a top rod is movably mounted inside the opening via a top rod mounting pin. A movable rod is slidably mounted on one end of the top rod. A pull block is rotatably mounted on one end of the movable rod via a pin. A pull rod is fixedly mounted on the lower end of the pull block. The lower end of the pull rod is fixedly connected to an outer frame. A second push block is mounted on the inner wall of the outer frame. The inner wall of the outer frame abuts against one end surface of the second push block. A screw assembly is provided inside the outer frame. The screw assembly includes a screw and a first push block. An arc-shaped groove is opened inside one end of both the first and second push blocks. One end of the screw abuts against one end surface of a clamping block.

[0006] Preferably, a universal locking wheel is fixedly installed on the lower surface of the base, a connecting wheel is fixedly installed on the lower surface of the telescopic rod, a positioning pin is installed inside one end of the base, and positioning holes are provided inside both the telescopic rod and the base. One end of the telescopic rod is located inside the base, and one end of the positioning pin passes through the positioning hole.

[0007] Preferably, a stabilizing block is fixedly installed on the upper surface of the base. The two stabilizing blocks are arranged in a triangle. One end of each of the two stabilizing blocks is fixedly connected to a support rod. A push rod is fixedly installed on one side of the support rod, and rubber sleeves are fitted on both ends of the push rod.

[0008] Preferably, a hydraulic cylinder mounting block is fixedly installed on one side of the support rod, and a hydraulic cylinder is movably installed inside the hydraulic cylinder mounting block through a hydraulic cylinder mounting pin. A piston rod is installed at the output end of the hydraulic cylinder, and one end of the piston rod is movably connected to the connecting block through a connecting pin. The upper surface of the connecting block is fixedly connected to the lower surface of the push rod.

[0009] Preferably, a fixing block is fixedly installed on one side of the top rod, and an electric telescopic rod is fixedly installed on one end of the fixing block. The output end of the electric telescopic rod is fixedly connected to the moving rod.

[0010] Preferably, the top and bottom walls of the outer frame are provided with T-shaped grooves, and T-shaped blocks are slidably installed inside the T-shaped grooves. A second push block is fixedly installed between the two T-shaped blocks, and the lower surface of the second push block abuts against the bottom wall of the outer frame.

[0011] Preferably, a screw mounting bracket is fixedly installed on one side of the outer frame, and a screw is installed inside the screw mounting bracket.

[0012] Preferably, a U-shaped rod is fixedly installed on the periphery of the clamping block, and a first push block is fixedly installed at both ends of the U-shaped rod.

[0013] Preferably, a spring is fixedly mounted on one end surface of each of the two first push blocks. The end of the spring away from the first push block is fixedly connected to a spring mounting block, and the upper end of the spring mounting block is fixedly connected to the outer frame by bolts. A slide rod is fixedly mounted on the upper end of each of the two first push blocks. The two ends of the slide rod are slidably connected to the inner wall of the slide groove, which is located inside the recess, and the recess is located inside the top wall of the outer frame.

[0014] Preferably, the outer frame has a through groove inside, and the through groove has a circular groove inside. The inner wall of the circular groove abuts against one end of the clamping cylinder. The outer peripheries of the two clamping cylinders are fixedly connected to the pinch block. The clamping cylinder is sleeved with a guide rod. A slide bar is fixedly connected to the outer periphery of the guide rod. The outer periphery of the slide bar is slidably connected to the strip groove inside the clamping cylinder. The guide rod is sleeved with a limiting spring. One end of the limiting spring is fixedly connected to the bottom block. The other end of the limiting spring is fixedly connected to the pinch block. The upper end of the bottom block is fixedly connected to a support plate. The support plate is slidably installed inside the through groove.

[0015] Compared with the prior art, the present invention has the following beneficial effects: In this invention, during the movement of the first push block, the spring is pulled to generate a reaction force. When the screw reverses and moves in the opposite direction, the spring is no longer pulled and rebounds, pulling the first push block back to its original position. This allows the distance between the first and second push blocks to be flexibly changed, thereby adapting to various specifications of installation rods. Before hoisting the mounting rod, position it between the first and second push blocks. Then, by turning the screw on the screw assembly, move the screw towards the second push block. After the screw moves, it will push the clamping block to move. After the clamping block moves, it will drive the U-shaped rod to move the two first push blocks towards the second push block. After the first push blocks move, they will clamp against the mounting rod, achieving the effect of clamping the mounting rod. At the same time, because one end of the first and second push blocks is set with an arc-shaped groove, the arc-shaped groove can clamp and fix most round mounting rods. The surface of one end of the first and second push blocks also retains a flat surface, which can satisfy the clamping and fixing of both square and round mounting rods, improving the efficiency of the assembly process. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall structure of a hoisting and lifting device for moving fitness equipment according to this utility model; Figure 2 This is a bottom view structural diagram of a hoisting and lifting device for moving fitness equipment according to this utility model; Figure 3 This is a front view structural diagram of a hoisting and lifting device for moving fitness equipment according to this utility model; Figure 4 This is a partial structural diagram of a hoisting and lifting device for moving fitness equipment according to this utility model; Figure 5 This is a schematic diagram of the screw assembly structure of a hoisting and lifting device for moving fitness equipment according to this utility model; Figure 6 This is a schematic diagram of the connection structure between the second push block and the T-shaped block of a hoisting and lifting device for moving fitness equipment according to this utility model; Figure 7 This is an enlarged structural diagram of section a of a hoisting and lifting device for moving fitness equipment according to this utility model; Figure 8 This is an enlarged structural diagram of section b of a hoisting and lifting device for moving fitness equipment according to this utility model; Figure 9 This is an enlarged structural diagram of point c of a hoisting and lifting device for moving fitness equipment according to this utility model; Figure 10 This is a schematic diagram of the connection structure between the clamping cylinder and the outer frame of a hoisting and lifting device for moving fitness equipment according to this utility model.

[0017] In the diagram: 1. Telescopic rod; 2. Base; 3. Support rod; 4. Hydraulic cylinder mounting block; 5. Hydraulic cylinder mounting pin; 6. Hydraulic cylinder; 7. Push rod mounting pin; 8. Push rod; 9. Screw assembly; 901. Screw; 902. Screw mounting bracket; 903. Clamping block; 904. U-shaped rod; 905. First push block; 906. Spring; 907. Spring mounting block; 908. Slide rod; 909. Arc groove; 910. Pinch block; 911. Clamping cylinder; 912. Guide rod; 913. Slide bar; 914. Limiting spring; 915. Base block; 916. Support plate; 917. Circular groove; 918. Through groove; 10. Slide groove; 11. Pin; 12. Pull block; 13. Pull rod; 14. Outer frame; 15. Moving rod; 16. Connecting wheel; 17. Universal locking wheel; 18. Positioning hole; 19. Positioning pin; 20. Stabilizing block; 21. Push rod; 22. Rubber sleeve; 23. Connecting pin; 24. Connecting block; 25. Fixing block; 26. Electric telescopic rod; 27. T-slot; 28. T-block; 29. ​​Groove; 30. Second push block. Detailed Implementation

[0018] The technical solutions of this utility model will be clearly and completely described below with reference to the embodiments of this utility model. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of this utility model. Example

[0019] like Figure 1-10 As shown, a lifting device for moving fitness equipment includes a base 2. A telescopic rod 1 is slidably installed at one end of the base 2. The base 2 is U-shaped. A support rod 3 is fixedly installed on the upper surface of the base 2. An opening is provided inside the upper end of the support rod 3, and a top rod 8 is movably installed inside the opening through a top rod mounting pin 7. A moving rod 15 is slidably installed at one end of the top rod 8. A pull block 12 is rotatably installed at one end of the moving rod 15 through a pin 11. A pull rod 13 is fixedly installed at the lower end of the pull block 12. The lower end of the pull rod 13 is fixedly connected to an outer frame 14. A second push block 30 is installed on the inner wall of the outer frame 14. The inner wall of the outer frame 14 abuts against one end surface of the second push block 30. A screw assembly 9 is provided inside the outer frame 14. The screw assembly 9 includes a screw 901 and a first push block 905. An arc-shaped groove 909 is opened inside one end of both the first push block 905 and the second push block 30. One end of the screw abuts against one end surface of a clamping block 903.

[0020] In this application, a universal locking wheel 17 is fixedly installed on the lower surface of the base 2, and a connecting wheel 16 is fixedly installed on the lower surface of the telescopic rod 1. A positioning pin 19 is installed inside one end of the base 2. Positioning holes 18 are provided inside both the telescopic rod 1 and the base 2. One end of the telescopic rod 1 is located inside the base 2, and one end of the positioning pin 19 passes through the positioning hole 18. A stabilizing block 20 is fixedly installed on the upper surface of the base 2. The two stabilizing blocks 20 are arranged in a triangle. One end of each of the two stabilizing blocks 20 is fixedly connected to the support rod 3. A push rod 21 is fixedly installed on one side of the support rod 3. Rubber sleeves 22 are fitted on both ends of the push rod 21. A hydraulic cylinder mounting block 4 is fixedly installed on one side of the support rod 3. A hydraulic cylinder 6 is movably installed inside the hydraulic cylinder mounting block 4 through a hydraulic cylinder mounting pin 5. A piston rod is installed at the output end of the hydraulic cylinder 6, and one end of the piston rod is movably connected to the connecting block 24 through a connecting pin 23. The upper surface of the connecting block 24 is fixedly connected to the lower surface of the push rod 8.

[0021] It should be noted that the hydraulic cylinder 6 and the electric telescopic rod 26 are electrically connected to the PLC control board using existing technology, so they will not be described in detail. The models of the hydraulic cylinder 6 and the electric telescopic rod 26 are selected according to the operating environment. Activating the hydraulic cylinder 6 will push the connecting block 24, causing the top rod 8 to rotate on the top rod mounting pin 7. The upward rotation of the top rod 8 will raise the end of the top rod 8 away from the support rod 3. This raised end will pull the pull block 12 and the pull rod 13, causing the outer frame 14 and the screw assembly 9 to move the mounting rod. After the electric telescopic rod 26 is activated, it will push or pull the moving rod 15 to slide inside the top rod 8, thereby changing the extension length of the moving rod 15 and better controlling the distance the lifted object moves. Meanwhile, the connecting wheel 16 and the universal locking wheel 17 are selected using existing technology. After pulling the positioning pin 19 out of the positioning hole 18, the telescopic rod 1 can be pushed to move inside the base 2. After determining the position of the telescopic rod 1, the positioning pin 19 is reinserted into the positioning hole 18 to lock the telescopic rod 1.

[0022] In this application, a fixing block 25 is fixedly installed on one side of the top rod 8, and an electric telescopic rod 26 is fixedly installed on one end of the fixing block 25. The output end of the electric telescopic rod 26 is fixedly connected to the moving rod 15. T-shaped grooves 27 are provided inside the top and bottom walls of the outer frame 14. T-shaped blocks 28 are slidably installed inside the T-shaped grooves 27. A second push block 30 is fixedly installed between the two T-shaped blocks 28, and the lower surface of the second push block 30 abuts against the bottom wall of the outer frame 14.

[0023] It should be noted that when the second push block 30 needs to be disassembled, it can be pulled directly to move the T-shaped block 28 out of the T-slot 27. The second push block 30 and the first push block 905 are made of rubber, which increases the friction between them and the mounting rod, thus better securing the mounting rod. After the second push block 30 is removed from the outer frame 14, the interior of the outer frame 14 can better accommodate the square mounting rod, increasing the contact area and better securing the square mounting rod, ensuring safety during the lifting process.

[0024] In this application, a screw mounting bracket 902 is fixedly installed on one side of the outer frame 14, and a screw 901 is installed inside the screw mounting bracket 902. A U-shaped rod 904 is fixedly installed on the periphery of the clamping block 903, and first push blocks 905 are fixedly installed at both ends of the U-shaped rod 904. A spring 906 is fixedly installed on one end surface of each of the two first push blocks 905, and the end of the spring 906 away from the first push block 905 is fixedly connected to a spring mounting block 907. The upper end of the spring mounting block 907 is fixedly connected to the outer frame 14 by bolts. A slide rod 908 is fixedly installed on the upper end of each of the two first push blocks 905, and the two ends of the slide rod 908 are slidably connected to the inner wall of the slide groove 10. The slide groove 10 is opened inside the groove 29, which is opened inside the top wall of the outer frame 14.

[0025] It should be noted that during the movement of the first push block 905, the spring 906 is pulled, causing the spring 906 to generate a reaction force. When the screw 901 reverses and moves in the opposite direction, the spring 906 is no longer pulled. After the spring 906 rebounds, it will pull the first push block 905 back to its position, allowing the distance between the first push block 905 and the second push block 30 to be flexibly changed, thereby adapting to various specifications of installation rods. After the installation rod is fixed, the hydraulic cylinder 6 will be activated, causing the top rod 8 and the moving rod 15 to rotate upwards, lifting the installation rod through the screw assembly 9, thus completing the lifting process. Before hoisting the mounting rod, the mounting rod can be positioned between the first push block 905 and the second push block 30. Then, by turning the screw 901 on the screw assembly 9, the screw 901 moves towards the second push block 30. After the screw 901 moves, it pushes the clamping block 903 to move. After the clamping block 903 moves, it drives the U-shaped rod 904 to move the two first push blocks 905 towards the second push block 30. After the first push blocks 905 move, they will clamp against the mounting rod, achieving the effect of clamping the mounting rod. At the same time, since one end of the first push block 905 and the second push block 30 is set with an arc groove 909, the arc groove 909 can clamp and fix most round mounting rods. The surface of one end of the first push block 905 and the second push block 30 also retains a flat surface, which can satisfy the clamping and fixing of square and round mounting rods. It should also be explained that the movement of the first push block 905 will drive the slide rod 908 to slide inside the slide groove 10.

[0026] In this application, the outer frame 14 has a through groove 918 inside, and a circular groove 917 inside the through groove 918. The inner wall of the circular groove 917 is abutted against one end of the clamping cylinder 911. The outer periphery of the two clamping cylinders 911 is fixedly connected to the pinch block 910. The clamping cylinder 911 is sleeved and connected to the guide rod 912. The outer periphery of the guide rod 912 is fixedly connected to the slide bar 913. The outer periphery of the slide bar 913 is slidably connected to the strip groove inside the clamping cylinder 911. The guide rod 912 is sleeved and connected to the limiting spring 914. One end of the limiting spring 914 is fixedly connected to the bottom block 915. The other end of the limiting spring 914 is fixedly connected to the pinch block 910. The upper end of the bottom block 915 is fixedly connected to the support plate 916. The support plate 916 is slidably installed inside the through groove 918.

[0027] It should be noted that the support plate 916 is used to support the hoisted shelf, ensuring its stability, preventing accidental falls, and improving safety. The position of the support plate 916 can be adjusted by squeezing the pinch block 910 to move the clamping cylinder 911 on the guide rod 912. The movement of the clamping cylinder 911 separates it from the circular groove 917, allowing the support plate 916 to be moved. When the pinch block 910 moves, the limiting spring 914 generates a reaction force. After releasing the pinch block 910, the limiting spring 914 rebounds, causing the clamping cylinder 911 to return to its original position and clamp against the circular groove 917, thus fixing the support plate 916.

[0028] The working principle of a hoisting and lifting device for moving fitness equipment: First, before hoisting the mounting rod, the mounting rod can be positioned between the first push block 905 and the second push block 30. Then, by turning the screw 901 on the screw assembly 9, the screw 901 moves towards the second push block 30. After the screw 901 moves, it pushes the clamping block 903 to move. After the clamping block 903 moves, it drives the U-shaped rod 904 to move the two first push blocks 905 towards the second push block 30. After the first push blocks 905 move, they will clamp against the mounting rod, thus clamping the mounting rod. At the same time, since one end of the first push block 905 and the second push block 30 is provided with an arc-shaped groove 909, the arc-shaped groove 909 can clamp and fix most round mounting rods. The surface of one end of the first push block 905 and the second push block 30 also retains a flat surface, which can satisfy the clamping and fixing of square and round mounting rods. Meanwhile, during the movement of the first push block 905, the spring 906 is pulled, causing the spring 906 to generate a reaction force. When the screw 901 reverses and moves in the opposite direction, the spring 906 is no longer pulled. After the spring 906 rebounds, it will pull the first push block 905 back to its position, allowing the distance between the first push block 905 and the second push block 30 to be flexibly changed, thereby adapting to various specifications of installation rods. After the installation rod is fixed, the hydraulic cylinder 6 will start, causing the top rod 8 and the moving rod 15 to rotate upwards, lifting the installation rod through the screw assembly 9, thus completing the lifting process.

[0029] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating this utility model, and are not intended to limit the implementation of this utility model. For those skilled in the art, other variations or modifications can be made based on the above description. It is impossible to exhaustively list all the implementation methods here. Any obvious variations or modifications derived from the technical solutions of this utility model are still within the protection scope of this utility model.

Claims

1. A hoisting and lifting device for moving fitness equipment, comprising a base (2), characterized in that: A telescopic rod (1) is slidably installed at one end of the base (2). The base (2) is U-shaped. A support rod (3) is fixedly installed on the upper surface of the base (2). An opening is provided inside the upper end of the support rod (3), and a top rod (8) is movably installed inside the opening via a top rod mounting pin (7). A movable rod (15) is slidably installed at one end of the top rod (8). A pull block (12) is rotatably installed at one end of the movable rod (15) via a pin (11). A pull rod (13) is fixedly installed at the lower end of the pull block (12). The lower end of the rod (13) is fixedly connected to the outer frame (14). The inner wall of the outer frame (14) is equipped with a second push block (30). The inner wall of the outer frame (14) is pressed against one end surface of the second push block (30). The inner side of the outer frame (14) is provided with a screw assembly (9). The screw assembly (9) includes a screw (901) and a first push block (905). An arc groove (909) is opened in the inner side of one end of the first push block (905) and the second push block (30). One end of the screw is pressed against one end surface of the pressing block (903).

2. The hoisting and lifting equipment for moving fitness equipment according to claim 1, characterized in that: A universal locking wheel (17) is fixedly installed on the lower surface of the base (2), and a connecting wheel (16) is fixedly installed on the lower surface of the telescopic rod (1). A positioning pin (19) is installed inside one end of the base (2). Positioning holes (18) are provided inside both the telescopic rod (1) and the base (2). One end of the telescopic rod (1) is located inside the base (2), and one end of the positioning pin (19) passes through the positioning hole (18).

3. The hoisting and lifting equipment for moving fitness equipment according to claim 1, characterized in that: A stabilizing block (20) is fixedly installed on the upper surface of the base (2). The two stabilizing blocks (20) are arranged in a triangle. One end of each of the two stabilizing blocks (20) is fixedly connected to the support rod (3). A push rod (21) is fixedly installed on one side of the support rod (3). Both ends of the push rod (21) are fitted with rubber sleeves (22).

4. The hoisting and lifting equipment for moving fitness equipment according to claim 1, characterized in that: A hydraulic cylinder mounting block (4) is fixedly installed on one side of the support rod (3). A hydraulic cylinder (6) is movably installed inside the hydraulic cylinder mounting block (4) through a hydraulic cylinder mounting pin (5). A piston rod is installed at the output end of the hydraulic cylinder (6), and one end of the piston rod is movably connected to the connecting block (24) through a connecting pin (23). The upper surface of the connecting block (24) is fixedly connected to the lower surface of the top rod (8).

5. The hoisting and lifting equipment for moving fitness equipment according to claim 4, characterized in that: A fixing block (25) is fixedly installed on one side of the top rod (8), and an electric telescopic rod (26) is fixedly installed on one end of the fixing block (25). The output end of the electric telescopic rod (26) is fixedly connected to the moving rod (15).

6. The hoisting and lifting equipment for moving fitness equipment according to claim 1, characterized in that: The top and bottom walls of the outer frame (14) are provided with T-shaped grooves (27), and T-shaped blocks (28) are slidably installed inside the T-shaped grooves (27). A second push block (30) is fixedly installed between the two T-shaped blocks (28), and the lower surface of the second push block (30) abuts against the bottom wall of the outer frame (14).

7. The hoisting and lifting device for moving fitness equipment according to claim 6, characterized in that: A screw mounting bracket (902) is fixedly installed on one side of the outer frame (14), and a screw (901) is installed inside the screw mounting bracket (902).

8. The hoisting and lifting equipment for moving fitness equipment according to claim 1, characterized in that: A U-shaped rod (904) is fixedly installed on the periphery of the clamping block (903), and a first push block (905) is fixedly installed at both ends of the U-shaped rod (904).

9. A hoisting and lifting device for moving fitness equipment according to claim 8, characterized in that: Springs (906) are fixedly installed on one end surface of each of the two first push blocks (905). The end of the spring (906) away from the first push block (905) is fixedly connected to the spring mounting block (907). The upper end of the spring mounting block (907) is fixedly connected to the outer frame (14) by bolts. Slide rods (908) are fixedly installed on the upper end of each of the two first push blocks (905). The two ends of the slide rods (908) are slidably connected to the inner wall of the slide groove (10). The slide groove (10) is opened inside the groove (29). The groove (29) is opened inside the top wall of the outer frame (14).

10. A hoisting and lifting device for moving fitness equipment according to claim 1, characterized in that: The outer frame (14) has a through groove (918) inside, and a circular groove (917) is formed inside the through groove (918). The inner wall of the circular groove (917) is abutted against one end of the clamping cylinder (911). The outer peripheries of the two clamping cylinders (911) are fixedly connected to the pinch block (910). The clamping cylinder (911) is sleeved with the guide rod (912). A slide bar (913) is fixedly connected to the outer periphery of the guide rod (912). The outer periphery of 913 is slidably connected to the strip groove inside the clamping cylinder (911). The guide rod (912) is sleeved and connected to the limiting spring (914). One end of the limiting spring (914) is fixedly connected to the bottom block (915). The other end of the limiting spring (914) is fixedly connected to the pinch block (910). The upper end of the bottom block (915) is fixedly connected to the support plate (916). The support plate (916) is slidably installed inside the through groove (918).

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