Rapid assembly tool for steel pipe bracket
Through the automated design of the support base and clamping mechanism, the problems of low assembly precision and low efficiency of traditional steel pipe brackets are solved, efficient and stable steel pipe welding is achieved, and production efficiency and welding quality are improved.
Patent Information
- Application Number
- CN202511022953.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-07-24
- Publication Date
- 2025-09-19
AI Technical Summary
The traditional steel pipe bracket assembly method has the disadvantages of low assembly accuracy, high labor intensity, and low production efficiency. It is difficult to achieve precise positioning and flexible adjustment, resulting in poor welding quality and efficiency, and cannot meet the needs of large-scale production.
It adopts support base, extension plate, V-shaped limit plate, clamping mechanism and unfolding mechanism, combined with servo motor and bidirectional hydraulic cylinder to achieve automatic positioning and clamping, adapt to steel pipes of different lengths, and ensure welding accuracy and stability.
It improves assembly efficiency, reduces labor intensity, enhances the versatility and welding quality of tooling, reduces welding defects and rework caused by inaccurate positioning, and improves the stability and safety of tooling.
Smart Images

Figure CN120663065A_ABST
Abstract
Description
Technical Field
[0001] The present invention relates to the technical field of steel pipe assembly, in particular to a quick assembly tool for a steel pipe bracket. Background Art
[0002] The workshop was tasked with completing a batch of steel tube brackets for Wal-New Company's scaffolding. The brackets came in two sizes, 1.2 meters and 1.6 meters long, totaling 834 pieces, weighing 11 tons. According to production requirements, all brackets needed to be completed and delivered within two weeks. The workshop faced significant pressure to complete this batch of ladders despite a full production schedule. Failure to meet the deadline would impact the company's subsequent scaffolding business. To achieve this, the workshop focused on improving production efficiency and analyzed the assembly process, which was the key factor influencing the entire production cycle. Improving assembly speed would significantly improve both meeting deadlines and reducing labor costs and increasing efficiency, thereby achieving significant improvements.
[0003] Traditional steel pipe bracket assembly methods rely primarily on manual operation or simple mechanical assistance, resulting in problems such as low assembly precision, high labor intensity, and low production efficiency. During the manual assembly process, due to varying levels of worker skill, it is difficult to ensure the assembly consistency of each bracket, resulting in the bracket and steel pipe being difficult to achieve the ideal fit accuracy, which can easily lead to safety hazards such as pipeline vibration and loosening. At the same time, with the rapid increase in demand for steel pipe brackets in large-scale engineering projects, the efficiency of traditional assembly methods can no longer meet the needs of large-scale production, severely restricting project progress and increasing project costs. In addition, steel pipe brackets with complex structures require multiple debugging and calibration during assembly, further reducing assembly efficiency and extending construction time.
[0004] While using the above technology, we discovered the following technical problems with the existing technology: During the steel pipe assembly process, two steel pipes often need to be welded together. Existing assembly methods often make it difficult to accurately position the steel pipes, causing them to easily shift during assembly and making it impossible to flexibly adjust them according to their actual lengths. During the assembly process, one end of the steel pipe is prone to warping, which not only affects assembly stability but also reduces welding accuracy, further affecting the quality and efficiency of steel pipe assembly and increasing assembly costs and time. Therefore, we designed a steel pipe bracket rapid assembly tool to provide another technical solution to the above technical problems. Summary of the Invention
[0005] The purpose of the present invention is to provide a quick assembly tool for a steel pipe bracket to solve the problems raised in the above background technology.
[0006] In order to solve the above technical problems, the present invention adopts the following technical solutions: A quick assembly tool for a steel pipe bracket comprises a support base, both ends of the support base are slidably connected to extension plates, the top of the support base is provided with a V-shaped groove, the inner side of the V-shaped limit plate is fixed, both ends of the top of the support base and located in the middle are fixed with B mounting frames, the ends of the two extension plates away from each other are fixed with A mounting frames, the interiors of the A mounting frame and the B mounting frame are respectively slidably connected with pressure plates, the bottom ends of the pressure plates are fixed with arc-shaped frame plates, and the outer sides of the A mounting frame and the B mounting frame are provided with clamping mechanisms for driving the arc-shaped frame plates to position the steel pipes.
[0007] Among them, the clamping mechanism includes a limit frame, a pressure assembly and a transmission assembly. The inner sides of the A mounting frame and the B mounting frame at one end are provided with a pressure assembly for pressing down the pressure plate and the arc-shaped frame plate, and the inner sides of the two limit frames at one end are provided with a transmission assembly for driving the pressure assembly.
[0008] Among them, the pressure assembly includes a transmission sleeve, a threaded rod and a main bevel gear. The top ends of the inner sides of the A mounting frame and the B mounting frame are respectively rotatably connected with threaded rods. The top end of the pressure plate is fixed with a transmission sleeve. The bottom end of the threaded rod is threadedly connected to the transmission sleeve. The top end of the threaded rod is fixed with a main bevel gear.
[0009] Among them, the transmission assembly includes a transmission slide rod, a transmission telescopic rod, a transmission limit ring, a servo motor and a slave bevel gear, the ends of the two limit frames that are close to each other are rotatably connected to the transmission slide rod and the transmission telescopic rod, the inner side of the transmission telescopic rod is slidably connected to the transmission slide rod, and the ends of the transmission slide rod and the transmission telescopic rod that are away from each other are fixed with a slave bevel gear, the bottom end of the slave bevel gear is rotatably connected to the main bevel gear, the top of the B mounting frame is equipped with a servo motor, the outer side of the servo motor is fixed to one of the limit frames, and the output end of the servo motor is fixed to one of the main bevel gears.
[0010] Wherein, guide grooves are provided on both sides of the transmission telescopic rod, the outer side of the transmission telescopic rod is slidably connected to a transmission limiting ring, and the inner side of the transmission limiting ring passes through the guide groove and is fixed to the transmission sliding rod.
[0011] Wherein, both sides of the top of the A installation frame and the B installation frame at one end are equipped with telescopic sliding rods.
[0012] Wherein, guide rods are fixed on both sides of the A mounting frame and the B mounting frame, and the outer sides of the guide rods are slidably connected to the pressure plates.
[0013] Among them, the bottom end of the arc-shaped frame plate is fixed with an anti-slip pad, and the four ends of the bottom end of the support base are equipped with rollers.
[0014] Among them, the bottom end of the support base is provided with an expansion mechanism for driving the extension plate and the support base to extend, and the expansion mechanism includes a fixed block, a two-way hydraulic cylinder, a guide rod and a transmission plate. Guide rods are fixed on both sides of the bottom end of the extension plate, and the two ends of the bottom end of the support base are respectively slidably connected to the guide rods.
[0015] A fixed block is fixed at the bottom of the support base, a bidirectional hydraulic cylinder is fixed inside the fixed block, a transmission plate is fixed at the output end of the bidirectional hydraulic cylinder, and both sides of the transmission plate are fixed to the guide rods respectively.
[0016] It can be seen without a doubt that the above-mentioned technical solution of this application can definitely solve the technical problem to be solved by this application.
[0017] Compared with existing technologies, the present invention has the following advantages: By using a servo motor to drive the clamping mechanism and a bidirectional hydraulic cylinder to control the expansion mechanism, the present invention achieves automated adjustment and clamping operations, reducing the tedious process of manual adjustment and greatly improving assembly efficiency. The operator only needs to perform a simple start-up operation, and the tooling can quickly complete the positioning and clamping of the steel pipe, reducing labor intensity and shortening working time. The unfolding mechanism can be flexibly adjusted according to the length of steel pipes of different lengths. The extension plate drives the relevant components to move synchronously. The transmission slide rod and transmission telescopic rod are adaptively extended and retracted, making the tooling adaptable to steel pipes of various specifications. This effectively solves the limitation of traditional tooling that can only fix steel pipes of a single length, improves the versatility and practicality of the tooling, and reduces the cost of enterprises equipped with multiple tooling due to the variety of steel pipe specifications. The V-shaped limit plate provides initial positioning for the steel pipe, and combined with the downward pressure and clamping of the curved frame plate in the clamping mechanism, it achieves precise positioning of the steel pipe. The guide rod limits the pressure plate, ensuring the stable downward pressure of the curved frame plate. The anti-slip pad further limits the steel pipe, preventing displacement during welding. This ensures the relative position accuracy between the two steel pipes, significantly improving welding quality and reducing welding defects and rework caused by inaccurate positioning. The rollers at the bottom of the support base facilitate the movement of the tooling, the telescopic slide rod improves the stability of the sliding adjustment between the installation frames, and the guide rod promotes the stability of the downward pressure of the pressure plate and the arc-shaped frame plate. The synergistic effect of multiple components ensures the overall stability of the tooling during operation. Even when operating larger or heavier steel pipes, the tooling can remain stable, reducing the impact of tooling shaking on welding quality, while also improving the service life and safety of the tooling. BRIEF DESCRIPTION OF THE DRAWINGS
[0018] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.
[0019] Figure 1 It is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the structure between the support base and the extension plate of the present invention; Figure 3 This is a schematic diagram of the structure between the fixed block and the transmission plate of the present invention; Figure 4 This is a schematic diagram of the structure between the support base and the V-shaped limiting plate of the present invention; Figure 5 This is a schematic diagram of the structure between the A mounting frame and the B mounting frame of the present invention; Figure 6 This is a schematic diagram of the structure between the threaded rod and the arc-shaped frame plate of the present invention; Figure 7 This is a schematic diagram of the structure between the servo motor and the threaded rod of the present invention; Figure 8 This is a schematic diagram of the structure between the transmission slide rod and the transmission telescopic rod of the present invention; Figure 9 This is a schematic diagram of the structure between the slave bevel gear and the master bevel gear of the present invention; Figure 10 It is a schematic diagram of the structure between the transmission limit ring and the transmission telescopic rod of the present invention.
[0020] In the figure: 1. Support base; 2. Extension plate; 3. Roller; 4. Fixed block; 5. Bidirectional hydraulic cylinder; 6. Guide rod; 7. Main bevel gear; 8. Transmission plate; 9. Telescopic slide rod; 10. A mounting frame; 11. Slave bevel gear; 12. Arc frame; 13. Guide rod; 14. Pressure plate; 15. V-groove; 16. V-shaped limit plate; 17. B mounting frame; 18. Limit frame; 19. Transmission slide rod; 20. Transmission telescopic rod; 21. Transmission limit ring; 22. Servo motor; 23. Transmission sleeve; 24. Threaded rod. DETAILED DESCRIPTION
[0021] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.
[0022] Example 1 See also Figure 1-10The present invention provides a technical solution: a steel pipe bracket quick assembly tool, comprising a support base 1, both ends of the support base 1 are slidably connected with an extension plate 2, the top of the support base 1 is provided with a V-shaped groove 15, the inner side of the V-shaped limit plate 16 is fixed, and both ends of the top of the support base 1 and the middle part are fixed with a B mounting frame 17, the ends of the two extension plates 2 away from each other are fixed with an A mounting frame 10, the insides of the A mounting frame 10 and the B mounting frame 17 are respectively slidably connected with a pressure plate 14, the bottom end of the pressure plate 14 is fixed with an arc frame plate 12, and the outer sides of the A mounting frame 10 and the B mounting frame 17 are provided with a clamping mechanism for driving the arc frame plate 12 to position the steel pipe; When in use, the two steel pipes to be welded are placed at both ends of the support base 1. At this time, the V-shaped limit plate 16 effectively limits the steel pipe. In order to prevent one end of the steel pipe from tilting, it is necessary to improve the stability and accuracy between the two steel pipes. At this time, the clamping mechanism is activated to drive the arc-shaped frame plates 12 inside the A mounting frame 10 and the B mounting frame 17 at both ends to position and press the steel pipes, so that the welding between the two steel pipes is smooth. The arc-shaped frame plate 12 on the inner side of the A mounting frame 10 and the B mounting frame 17 at one end effectively positions the two ends of a steel pipe, thereby promoting the stability of the steel pipe fixation and increasing the quality of the welding of the two steel pipes; The clamping mechanism includes a limit frame 18, a pressure assembly and a transmission assembly. The inner side of the A mounting frame 10 and the B mounting frame 17 at one end is provided with a pressure assembly for pressing down the pressure plate 14 and the arc-shaped frame plate 12. The inner side of the two limit frames 18 at one end is provided with a transmission assembly for driving the pressure assembly. Specifically, two steel pipes are placed on the V-shaped limiting plate 16, and then the transmission assembly is activated to drive the pressure assembly to press down the pressure plate 14 and the arc-shaped frame plate 12, thereby effectively pressurizing and limiting the two steel pipes respectively, thereby increasing the accuracy and stability between the two steel pipes; The pressure assembly includes a transmission sleeve 23, a threaded rod 24 and a main bevel gear 7. The top ends of the inner sides of the A mounting frame 10 and the B mounting frame 17 are rotatably connected to the threaded rod 24 respectively. The top end of the pressure plate 14 is fixed with the transmission sleeve 23. The bottom end of the threaded rod 24 is threadedly connected to the transmission sleeve 23. The top end of the threaded rod 24 is fixed with the main bevel gear 7. By rotating the main bevel gear 7, the threaded rod 24 is driven to rotate, and the threaded rod 24 drives the transmission sleeve 23, the pressure plate 14 and the arc frame 12 to move up and down, and the A mounting frame 10 and the B mounting frame 17 respectively limit the pressure plate 14, thereby effectively driving the arc frame 12 to press the steel pipe downward for positioning; The transmission assembly includes a transmission slide 19, a transmission telescopic rod 20, a transmission limit ring 21, a servo motor 22 and a slave bevel gear 11. The ends of the two limit frames 18 that are close to each other are rotatably connected to the transmission slide 19 and the transmission telescopic rod 20. The inner side of the transmission telescopic rod 20 is slidably connected to the transmission slide 19. The ends of the transmission slide 19 and the transmission telescopic rod 20 that are away from each other are fixed with the slave bevel gear 11. The bottom end of the slave bevel gear 11 is rotatably connected to the main bevel gear 7. The top of the B mounting frame 17 is equipped with a servo motor 22. The outer side of the servo motor 22 is fixed to one of the limit frames 18, and the output end of the servo motor 22 is fixed to one of the main bevel gears 7. Furthermore, by starting the servo motor 22, one of the main bevel gears 7 inside the B mounting frame 17 is driven to rotate, and one of the main bevel gears 7 drives the slave bevel gear 11, the transmission telescopic rod 20, the transmission limit ring 21, the transmission slide rod 19 and the other main bevel gear 7 to rotate, thereby effectively driving the threaded rod 24 to rotate synchronously, and the threaded rod 24 drives the transmission sleeve 23, the pressure plate 14 and the arc-shaped frame plate 12 to clamp the steel pipe on the V-shaped limit plate 16, so as to promote the welding quality between the two steel pipes; Guide grooves are provided on both sides of the transmission telescopic rod 20. A transmission limit ring 21 is slidably connected to the outer side of the transmission telescopic rod 20. The inner side of the transmission limit ring 21 passes through the guide groove and is fixed to the transmission slide 19. Telescopic slides 9 are assembled on both sides of the top of the A mounting frame 10 and the B mounting frame 17 at one end. Specifically, the extension plate 2 is extended along the guide of the support base 1, and the extension plate 2 drives the A mounting frame 10, one of the transmission plates 8, the telescopic slide rod 9 and the transmission limit ring 21 to extend synchronously along the inside of the transmission telescopic rod 20, and the contraction of the transmission slide rod 19 and the transmission telescopic rod 20 is synchronized according to the extension of the extension plate 2, thereby effectively adjusting and fixing according to the length of the steel pipe, and the telescopic slide rod 9 effectively improves the stability of the sliding adjustment between the A mounting frame 10 and the B mounting frame 17; Guide rods 13 are fixed on both sides of the A mounting frame 10 and the B mounting frame 17. The outer sides of the guide rods 13 are slidably connected to the pressure plate 14. The bottom end of the arc frame 12 is fixed with an anti-slip pad. The four ends of the bottom end of the support base 1 are equipped with rollers 3. The guide rods 13 effectively promote the stability of the pressure plate 14 and the arc frame 12 in pressing down on the steel pipe, and the anti-slip pad increases the limiting effect of the arc frame 12 on the steel pipe. Example 2 See also Figure 3-6The present invention provides a technical solution: a steel pipe bracket quick assembly tool, the bottom end of the support base 1 is provided with an expansion mechanism for driving the extension plate 2 and the support base 1 to extend, the expansion mechanism includes a fixed block 4, a two-way hydraulic cylinder 5, a guide rod 6 and a transmission plate 8, both sides of the bottom end of the extension plate 2 are fixed with guide rods 6, both ends of the bottom end of the support base 1 are respectively slidably connected with the guide rods 6, the bottom end of the support base 1 is fixed with a fixed block 4, the inside of the fixed block 4 is fixed with a two-way hydraulic cylinder 5, the output end of the two-way hydraulic cylinder 5 is fixed with a transmission plate 8, and the inside of the transmission plate 8 is fixed with the guide rods 6 on both sides; Specifically, the output end of the two-way hydraulic cylinder 5 drives the two transmission plates 8 and the guide rod 6 at both ends to move, so that the output end of the two-way hydraulic cylinder 5 drives the two rollers 3 at both ends to move toward one end away from the support base 1. At this time, the extension plate 2 drives the guide rod 6 and the transmission plate 8 to extend along the guide of the support base 1, so as to effectively adjust the limit according to the length of the two steel pipes, thereby preventing one end of the steel pipe from being unsupported, causing deviation at the end where the two steel pipes are close to each other.
[0023] The use process of the steel pipe bracket quick assembly tool provided by the present invention is as follows: the two steel pipes to be welded are placed in the V-shaped grooves 15 at both ends of the support base 1, and the V-shaped limit plates 16 perform preliminary position limiting on the steel pipes. When the tool needs to be adjusted to adapt to steel pipes of different lengths, the deployment mechanism is activated, and the output end of the two-way hydraulic cylinder 5 drives the transmission plate 8 and the guide rod 6 to move, so that the extension plate 2 extends along the guide of the support base 1, driving the A mounting frame 10 and other components to move synchronously. At the same time, the transmission slide bar 19 and the transmission telescopic rod 20 synchronously extend and retract according to the movement of the extension plate 2, thereby realizing the tool's adaptation to steel pipes of different lengths and preventing welding deviation caused by the lack of support at one end of the steel pipe. After the placement and length adaptation of the steel pipe are completed, the clamping mechanism is started. The servo motor 22 drives the main bevel gear 7 on the inside of the B mounting frame 17 to rotate. The main bevel gear 7 drives the slave bevel gear 11 to rotate through meshing, thereby causing the transmission telescopic rod 20, the transmission limit ring 21, the transmission slide 19 and the other main bevel gear 7 to rotate synchronously. The rotation of the main bevel gear 7 drives the threaded rod 24 to rotate. Since the threaded rod 24 is threadedly connected to the transmission sleeve 23 at the top of the pressure plate 14, the threaded rod 24 drives the transmission sleeve 23, the pressure plate 14 and the arc frame 12 to move downward when it rotates. The A mounting frame 10 and the B mounting frame 17 limit the pressure plate 14 through the guide rod 13 to ensure its stable downward movement. Finally, the arc frame 12 presses down and clamps the steel pipe in place through the anti-slip pad at the bottom, thereby improving the stability and accuracy between the two steel pipes and ensuring the smoothness and quality of welding. During the entire working process, the roller 3 at the bottom of the support base 1 facilitates the movement of the tooling; the telescopic slide rod 9 improves the stability of the sliding adjustment between the A mounting frame 10 and the B mounting frame 17; the guide rod 13 promotes the stability of the pressure plate 14 and the arc-shaped frame plate 12 pressing down on the steel pipe. These components work together to ensure the overall stability of the tooling during operation.
[0024] Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative work shall fall within the scope of protection of the present invention.
Claims
1. A quick assembly tool for a steel pipe bracket, characterized in that: The invention comprises a support base (1), both ends of the support base (1) are slidably connected to extension plates (2), the top of the support base (1) is provided with a V-shaped groove (15), the inner side of the V-shaped groove (15) is fixed with a V-shaped limit plate (16), both ends of the top of the support base (1) and the middle part are fixed with B mounting frames (17), the ends of the two extension plates (2) away from each other are fixed with A mounting frames (10), the insides of the A mounting frame (10) and the B mounting frame (17) are respectively slidably connected with pressure plates (14), the bottom ends of the pressure plates (14) are fixed with arc-shaped frame plates (12), and the outer sides of the A mounting frame (10) and the B mounting frame (17) are provided with clamping mechanisms for driving the arc-shaped frame plates (12) to position the steel pipe.
2. A steel pipe bracket quick assembly tool according to claim 1, characterized in that: The clamping mechanism includes a limit frame (18), a pressure assembly and a transmission assembly. The inner sides of the A mounting frame (10) and the B mounting frame (17) at one end are provided with a pressure assembly for pressing down the pressure plate (14) and the arc-shaped frame plate (12). The inner sides of the two limit frames (18) at one end are provided with a transmission assembly for driving the pressure assembly.
3. A steel pipe bracket quick assembly tool according to claim 2, characterized in that: The pressure assembly includes a transmission sleeve (23), a threaded rod (24) and a main bevel gear (7); the top ends of the inner sides of the A mounting frame (10) and the B mounting frame (17) are rotatably connected to the threaded rod (24), the top end of the pressure plate (14) is fixed with the transmission sleeve (23), the bottom end of the threaded rod (24) is threadedly connected to the transmission sleeve (23), and the top end of the threaded rod (24) is fixed with the main bevel gear (7).
4. A steel pipe bracket quick assembly tool according to claim 2, characterized in that: The transmission assembly includes a transmission slide bar (19), a transmission telescopic rod (20), a transmission limiting ring (21), a servo motor (22) and a slave bevel gear (11). The ends of the two limiting frames (18) that are close to each other are both rotatably connected to the transmission slide bar (19) and the transmission telescopic rod (20). The inner side of the transmission telescopic rod (20) is slidably connected to the transmission slide bar (19). The ends of the transmission slide bar (19) and the transmission telescopic rod (20) that are away from each other are both fixed with the slave bevel gear (11). The bottom end of the slave bevel gear (11) is rotatably connected to the main bevel gear (7). The top end of the B mounting frame (17) is equipped with a servo motor (22). The outer side of the servo motor (22) is fixed to one of the limiting frames (18), and the output end of the servo motor (22) is fixed to one of the main bevel gears (7).
5. A steel pipe bracket quick assembly tool according to claim 4, characterized in that: Guide grooves are provided on both sides of the transmission telescopic rod (20), and a transmission limiting ring (21) is slidably connected to the outer side of the transmission telescopic rod (20), and the inner side of the transmission limiting ring (21) passes through the guide groove and is fixed to the transmission slide rod (19).
6. A steel pipe bracket quick assembly tool according to claim 4, characterized in that: Both sides of the top of the A mounting frame (10) and the B mounting frame (17) at one end are equipped with telescopic slide rods (9).
7. A steel pipe bracket quick assembly tool according to claim 6, characterized in that: Guide rods (13) are fixed on both sides of the A mounting frame (10) and the B mounting frame (17), and the outer sides of the guide rods (13) are slidably connected to the pressure plates (14).
8. The steel pipe bracket quick assembly tool according to claim 2, characterized in that: An anti-slip pad is fixed to the bottom end of the arc-shaped frame plate (12), and rollers (3) are installed at the four ends of the bottom end of the support base (1).
9. The steel pipe bracket quick assembly tool according to claim 1, characterized in that: The bottom end of the support base (1) is provided with an expansion mechanism for driving the extension plate (2) and the support base (1) to extend, and the expansion mechanism comprises a fixed block (4), a two-way hydraulic cylinder (5), a guide rod (6) and a transmission plate (8), and the guide rods (6) are fixed on both sides of the bottom end of the extension plate (2), and the two ends of the bottom end of the support base (1) are respectively slidably connected to the guide rods (6).
10. A steel pipe bracket quick assembly tool according to claim 9, characterized in that: A fixing block (4) is fixed to the bottom end of the support base (1), a bidirectional hydraulic cylinder (5) is fixed inside the fixing block (4), a transmission plate (8) is fixed to the output end of the bidirectional hydraulic cylinder (5), and both sides inside the transmission plate (8) are respectively fixed to the guide rods (6).