A pressure test bench for large oil cylinders

Abstract

The application discloses a pressure test platform for large oil cylinder, which comprises a base, a test platform body, a gantry support frame structure, a safety protection mechanism, an oil leakage detection mechanism and an oil leakage collection mechanism. The application sets a guide mechanism, uses the lifting guide sliding rail mode of the second hydraulic cylinder to replace the traditional elastic sliding guide rail, effectively solves the hard friction problem of the test platform in the entering process under heavy load of the large oil cylinder, improves the service life and test efficiency of the test platform, and the setting of the safety protection mechanism can effectively protect the operator during the test process, timely sends an alarm and takes emergency measures when an abnormal situation occurs, greatly reduces the probability of safety accidents, and the combination of the oil leakage detection mechanism and the oil leakage collection mechanism realizes real-time monitoring and timely collection of the oil leakage of the oil cylinder, which not only can timely find the quality problem of the oil cylinder, but also can avoid environmental pollution and resource waste caused by oil leakage.

Description

Technical Field

[0001] This invention relates to the field of hydraulic cylinder testing equipment technology, specifically to a pressure testing bench for a large hydraulic cylinder. Background Technology

[0002] In hydraulic systems, the hydraulic cylinder is a crucial actuator, and its performance directly affects the overall system's efficiency and reliability. Therefore, pressure testing of the hydraulic cylinder is a key step in ensuring its quality. Currently, existing hydraulic cylinder pressure testing benches, such as the one described in application number CN201822011160.2, bring the cylinder to be tested into the testing bench via a support platform. By incorporating elastic sliding guides, the pressure of the cylinder during testing is ultimately borne by the base. This design features simple structure, low manufacturing cost, and long service life. However, this existing technology has significant drawbacks: when the hydraulic cylinder to be tested is large and heavy, the weight exceeds the capacity of the elastic sliding guide during the entry of the test bench, compressing the spring and causing the test bench to directly contact the base during entry, resulting in jamming and hard friction. This not only affects testing efficiency but also accelerates equipment wear. Furthermore, this patent lacks any protective structure during testing. If a cylinder bursts or an oil pipe ruptures during testing, the flying fragments and high-pressure oil can cause serious personal injury to operators. In addition, the existing technology lacks a leak detection structure for the test cylinder and a leak collection structure, making it impossible to detect leaks in a timely manner or effectively collect leaked oil, easily leading to environmental pollution and resource waste. Therefore, there is an urgent need to design a large hydraulic cylinder pressure testing bench that can solve the above problems. Summary of the Invention

[0003] To address the aforementioned problems, this invention provides a pressure testing bench for a large hydraulic cylinder.

[0004] This invention is achieved through the following technical solution:

[0005] A pressure testing bench for a large hydraulic cylinder includes a base, a test bench body, a gantry support frame structure, a safety protection mechanism, an oil leakage detection mechanism, and an oil leakage collection mechanism. The base is a basic support structure with an oil receiving groove on its upper surface. The test bench body is placed within the oil receiving groove, and its upper surface is equipped with a fixing device for securing the hydraulic cylinder. The test bench body is rectangular in shape, and load-bearing rollers are fixed at the four corners of its bottom end. A guide rail structure is provided within the oil receiving groove, and the test bench body advances along the guide rail structure via the load-bearing rollers at its lower end. The safety protection mechanism includes a protective frame, a protective net, and sensor components. The protective frame is installed within the gantry support frame structure. The outer perimeter is fixedly connected to the outer wall of the gantry support frame structure with bolts to form a closed protective space. The protective net is installed on the protective frame. The sensor assembly includes a pressure sensor installed on the gantry support frame structure and the hydraulic cylinder jacking part, and a displacement sensor installed on the protective net. The oil leakage detection mechanism includes two oil leakage detection probes and an alarm. The two oil leakage detection probes are respectively set at two opposite corners on the top surface of the test bench body. The gantry support frame structure is fixed to one side of the top surface of the base. The protective frame on the gantry support frame structure near the test bench body is raised and lowered. The raising and lowering process of this protective frame is realized by a screw structure. A controller is fixedly installed on the side wall of the base.

[0006] Preferably, the guide rail structure includes two guide rails arranged parallel to each other in the oil receiving groove. The bottom ends of the two guide rails are fixed with the same connecting plate. First guide rods are symmetrically fixed on both sides of the bottom surface of the connecting plate. Guide cylinders are slidably sleeved on the first guide rods. The bottom end of the guide cylinder is fixed to the bottom end of the oil receiving groove. A second hydraulic cylinder is fixedly installed on the bottom end of the oil receiving groove. The telescopic end of the second hydraulic cylinder is fixedly connected to the bottom surface of the connecting plate. The load-bearing roller cooperates with the guide rail and rolls forward along the guide rail.

[0007] Preferably, the oil leakage collection mechanism includes an oil receiving inclined plate and an oil guide pipe. The oil receiving inclined plate is fixedly installed in the oil receiving groove. The guide slide rail penetrates the oil receiving inclined plate and is slidably connected to it in a sealed manner. The oil guide pipe is fixedly connected to the side wall of the base and communicates with the oil receiving groove at the upper end of the oil receiving inclined plate.

[0008] Preferably, the gantry support frame structure includes four support columns and a force-bearing plate fixedly disposed between the four support columns. The bottom end of the support column is fixed to the top surface of the base. A first hydraulic cylinder is fixedly installed at the center of the top surface of the force-bearing plate. The telescopic end of the first hydraulic cylinder penetrates the force-bearing plate and is fixed to a force-bearing plate. A pressure sensor is installed at the center of the bottom surface of the force-bearing plate. Four second guide rods are evenly fixed on the top surface of the force-bearing plate. The top ends of the second guide rods penetrate the force-bearing plate and are slidably connected at their contact points. The alarm is fixed to the top surface of the support column.

[0009] Preferably, the lead screw structure includes two L-shaped connecting plates fixed on both sides of the bottom of the protective frame. A lead screw is provided through both L-shaped connecting plates. The L-shaped connecting plates are threadedly connected to the lead screw. The bottom end of the lead screw is rotatably connected to the top surface of the base through a bearing. A drive motor is fixedly connected to the top end of the lead screw. The drive motor is fixedly mounted on a mounting plate. The mounting plate is fixed to the outer wall of the gantry support frame structure. The output shaft of the drive motor penetrates the mounting plate and is fixedly connected to the top end of the lead screw. The oil leakage detection probe, drive motor, alarm, pressure sensor, and displacement sensor are electrically connected to the controller through wires.

[0010] Preferably, the base is provided with a hydraulic station and a force-bearing column. The force-bearing column is integrally formed with the base and is located at the lower end of the force-bearing plate. The top of the force-bearing column penetrates the oil receiving inclined plate and is sealed and fixedly connected to it at the contact point. In the initial state, the top surface of the force-bearing column is lower than the bottom surface of the test platform body. The hydraulic station is electrically connected to the controller through wires.

[0011] Preferably, the fixing device includes two vertical plates fixed at two opposite corners on the top surface of the test bench body. A third hydraulic cylinder is fixedly installed on the opposite side of each of the two vertical plates. The telescopic end of the third hydraulic cylinder penetrates the vertical plate and is fixed with a V-shaped fixing plate. A third guide rod is fixed on the side wall of the V-shaped fixing plate. The third guide rod penetrates the vertical plate and is slidably connected at its contact point. Multiple V-shaped clamps are evenly fixed on the inner side of the V-shaped fixing plate.

[0012] Preferably, a horizontal plate is fixed to one side of the top surface of the base, and a fourth hydraulic cylinder is fixedly installed on the side wall of the horizontal plate. The telescopic end of the fourth hydraulic cylinder penetrates the horizontal plate and is fixed with a connecting block. A pin is fixed to the bottom end of the connecting block. The pin penetrates one edge of the test bench body and is slidably connected to the test bench body. The third hydraulic cylinder, the fourth hydraulic cylinder, the first hydraulic cylinder, and the second hydraulic cylinder are respectively connected to the hydraulic station pipeline through conduits.

[0013] Compared with existing technologies, the beneficial effects of this invention are:

[0014] 1. This invention, by setting up a guiding mechanism and using a second hydraulic cylinder to lift the guide slide rail, replaces the traditional elastic sliding guide rail, effectively solving the problem of jamming and hard friction during the entry of the test bench when the large hydraulic cylinder is under heavy load, and improving the service life and testing efficiency of the test bench.

[0015] 2. The safety protection mechanism can effectively protect the operators during the testing process. When an abnormal situation occurs, it can issue an alarm in time and take emergency measures, which greatly reduces the probability of safety accidents.

[0016] 3. The combination of oil leakage detection and collection mechanisms enables real-time monitoring and timely collection of oil leakage in the hydraulic cylinder. This not only allows for the timely detection of quality problems in the hydraulic cylinder but also avoids environmental pollution and resource waste caused by oil leakage, resulting in good economic and environmental benefits. Attached Figure Description

[0017] Figure 1 This is a perspective view of the structure described in this invention;

[0018] Figure 2 This is a cross-sectional view of the structure described in this invention;

[0019] Figure 3 It is a three-dimensional structure of the present invention. Figure 1 ;

[0020] Figure 4 This is a top view of the structure described in this invention.

[0021] In the diagram: 1. Base; 2. Gantry support frame structure; 3. Force plate; 4. Support column; 5. First hydraulic cylinder; 6. Second guide rod; 7. Force plate; 8. Pressure sensor; 9. Safety protection mechanism; 10. Protective frame; 11. Protective net; 12. Displacement sensor; 13. Mounting plate; 14. Drive motor; 15. Lead screw; 16. L-shaped connecting plate; 17. Oil receiving groove; 18. Oil guide pipe; 19. Oil receiving inclined plate; 20. Second hydraulic cylinder; 21. Connecting plate; 22. Guide cylinder; 23. First guide rod; 24. Guide slide rail; 25. Force column; 26. Load-bearing roller; 27. Horizontal plate; 28. Fourth hydraulic cylinder; 29. ​​Connecting block; 30. Pin; 31. Oil leakage detection probe; 32. Vertical plate; 33. Third hydraulic cylinder; 34. V-shaped fixing plate; 35. V-shaped clamp; 36. Third guide rod; 37. Controller; 38. Test bench body; 39. Alarm. Detailed Implementation

[0022] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments:

[0023] like Figure 1 , Figure 2 , Figure 3 , Figure 4As shown, a pressure testing bench for a large hydraulic cylinder includes a base 1, a test bench body 38, a gantry support frame structure 2, a safety protection mechanism 9, an oil leakage detection mechanism, and an oil leakage collection mechanism. The base is a basic support structure with an oil receiving groove 17 on its upper surface. The test bench body 38 is placed in the oil receiving groove 17. The upper surface of the test bench body 38 is provided with a fixing device for fixing the hydraulic cylinder. The test bench body 38 is rectangular in shape. Load-bearing rollers 26 are fixed at the four corners of the bottom of the test bench body 38. A guide rail structure is provided in the oil receiving groove 17. The test bench body 38 moves along the guide rail structure via the load-bearing rollers 26 at its lower end. The safety protection mechanism 9 includes a protective frame 10, a protective net 11, and a sensor assembly. The protective frame 10 is set in the gantry support frame structure. The outer perimeter of the structure 2 is fixedly connected to the outer wall of the gantry support frame structure 2 by bolts to form a closed protective space. The protective net 11 is installed on the protective frame 10. The sensor assembly includes a pressure sensor 8 installed on the gantry support frame structure 2 and the oil cylinder jacking part, and a displacement sensor 12 installed on the protective net 11. The oil leakage detection mechanism includes two oil leakage detection probes 31 and an alarm 39. The two oil leakage detection probes 31 are respectively set at two opposite corners on the top surface of the test bench body 38. The gantry support frame structure 2 is fixed to one side of the top surface of the base 1. The protective frame 10 on the gantry support frame structure 2 near the test bench body 38 is raised and lowered. The raising and lowering process of this protective frame 10 is realized by a screw structure. A controller 37 is fixedly installed on the side wall of the base 1.

[0024] The guide rail structure includes two guide rails 24 arranged in parallel within the oil receiving groove 17. The bottom ends of the two guide rails 24 are fixed with the same connecting plate 21. The bottom surfaces of the connecting plate 21 are symmetrically fixed with first guide rods 23. Guide cylinders 22 are slidably sleeved on the first guide rods 23. The bottom end of the guide cylinders 22 is fixed to the bottom end of the oil receiving groove 17. A second hydraulic cylinder 20 is fixedly installed on the bottom end of the oil receiving groove 17. The telescopic end of the second hydraulic cylinder 20 is fixedly connected to the bottom surface of the connecting plate 21. The load-bearing roller 26 cooperates with the guide rails 24 and rolls forward along the guide rails 24.

[0025] The oil leakage collection mechanism includes an oil receiving inclined plate 19 and an oil guide pipe 18. The oil receiving inclined plate 19 is fixedly installed in the oil receiving groove 17. The guide slide rail 24 penetrates the oil receiving inclined plate 19 and is slidably connected to it in a sealed manner. The oil guide pipe 18 is fixedly connected to the side wall of the base 1 and communicates with the oil receiving groove 17 at the upper end of the oil receiving inclined plate 19.

[0026] The gantry support frame structure 2 includes four support columns 4 and a force-bearing plate 3 fixedly disposed between the four support columns 4. The bottom end of the support column 4 is fixed to the top surface of the base 1. A first hydraulic cylinder 5 is fixedly installed at the center of the top surface of the force-bearing plate 3. The telescopic end of the first hydraulic cylinder 5 penetrates the force-bearing plate 3 and is fixed to a force-bearing plate 7. A pressure sensor 8 is installed at the center of the bottom surface of the force-bearing plate 7. Four second guide rods 6 are evenly fixed on the top surface of the force-bearing plate 7. The top end of the second guide rod 6 penetrates the force-bearing plate 3 and is slidably connected at its contact point. The alarm 39 is fixed to the top surface of the support column 4.

[0027] The lead screw structure includes two L-shaped connecting plates 16 fixed on both sides of the bottom of the protective frame 10. A lead screw 15 is provided through each of the two L-shaped connecting plates 16. The L-shaped connecting plates 16 are threadedly connected to the lead screw 15. The bottom end of the lead screw 15 is rotatably connected to the top surface of the base 1 through a bearing. A drive motor 14 is fixedly connected to the top end of the lead screw 15. The drive motor 14 is fixedly mounted on a mounting plate 13. The mounting plate 13 is fixed to the outer wall of the gantry support frame structure 2. The output shaft of the drive motor 14 penetrates the mounting plate 13 and is fixedly connected to the top end of the lead screw 15. The oil leakage detection probe 31, drive motor 14, alarm 39, pressure sensor 8 and displacement sensor 12 are electrically connected to the controller 37 through wires.

[0028] The base 1 is equipped with a hydraulic station and a force-bearing column 25. The force-bearing column 25 is integrally formed with the base 1. The force-bearing column 25 is located at the lower end of the force-bearing plate 7, and the top of the force-bearing column 25 penetrates the oil receiving inclined plate 19 and is sealed and fixedly connected to it at the contact point. In the initial state, the top surface of the force-bearing column 25 is lower than the bottom surface of the test platform body 38. The hydraulic station is electrically connected to the controller 37 through wires.

[0029] The fixing device includes two vertical plates 32 fixed at two opposite corners on the top surface of the test bench body 38. A third hydraulic cylinder 33 is fixedly installed on the opposite side of the two vertical plates 32. The telescopic end of the third hydraulic cylinder 33 penetrates the vertical plate 32 and is fixed with a V-shaped fixing plate 34. A third guide rod 36 is fixed on the side wall of the V-shaped fixing plate 34. The third guide rod 36 penetrates the vertical plate 32 and is slidably connected at its contact point. A plurality of V-shaped clamps 35 are evenly fixed on the inner side of the V-shaped fixing plate 34.

[0030] A horizontal plate 27 is fixed to one side of the top surface of the base 1. A fourth hydraulic cylinder 28 is fixedly installed on the side wall of the horizontal plate 27. The telescopic end of the fourth hydraulic cylinder 28 penetrates the horizontal plate 27 and is fixed with a connecting block 29. A pin 30 is fixed to the bottom end of the connecting block 29. The pin 30 penetrates one edge of the test bench body 38 and is slidably connected to the test bench body 38. The third hydraulic cylinder 33, the fourth hydraulic cylinder 28, the first hydraulic cylinder 6, and the second hydraulic cylinder 20 are respectively connected to the hydraulic station pipeline through conduits.

[0031] Working principle: In the test preparation stage, the large hydraulic cylinder to be tested is first placed vertically on the test bench body 38. Then, the large hydraulic cylinder is fixed in place by a fixing device. The controller 37 starts the third hydraulic cylinder 33, controlling the telescopic ends of the two third hydraulic cylinders 33 to extend synchronously. In this way, the large hydraulic cylinder is clamped and fixed between the two sets of multiple V-shaped clamps 35, ensuring that the hydraulic cylinder will not be displaced during the test. Subsequently, the controller 37 activates the fourth hydraulic cylinder 28, controlling the extension end of the fourth hydraulic cylinder 28 to extend, pushing the test platform body 38 into the gantry support frame structure 2 via the fourth hydraulic cylinder 28. After the test platform body 38, along with the hydraulic cylinder, enters the gantry support frame structure 2, the drive motor 14 receives the command from the controller 37 and operates, driving the lead screw 15 to rotate. The lead screw 15 moves the protective frame 10 down through the L-shaped connecting plate 16, so that the safety protection mechanism 9 on the outside of the gantry support frame structure 2 forms a closed protective space. At the same time, the second hydraulic cylinder 20 receives the command from the controller 37 and operates, retracting the extension end of the second hydraulic cylinder 20. At this time, the two guide rails 24 descend, and the load-bearing roller 26 at the lower end of the test platform body 38 is suspended and separated from the guide rails 24. The bottom surface of the test platform body 38 is in contact with the top surface of the force-bearing column 25. Thus, during the test, the pressure is ultimately borne by the base 1. At this time, the test program can be started by the controller 37, injecting pressurized oil into the hydraulic cylinder for pressure testing. At this time, the extension end of the hydraulic cylinder abuts against the force-bearing plate 7. The pressure sensor 8 installed on the force-bearing plate 7 monitors the pressure changes transmitted from the hydraulic cylinder in real time and transmits the pressure data to the control system. Under normal testing conditions, the protective frame 10 and protective net 11 of the safety protection mechanism 9 surround the test area, forming a closed space to prevent accidental fragments or oil splashes from injuring operators during the test.

[0032] In the event of an abnormal situation, such as pressure sensor 8 detecting an abnormal increase in internal pressure of the cylinder, or displacement sensor 12 installed on the protective frame 10 detecting deformation of the protective net 11 due to a large impact force, the control system will react immediately, sound an alarm and illuminate warning light 39, stop the test program, quickly activate emergency protection measures, close the hydraulic station oil circuit valve, cut off the pressure source of the cylinder, and prevent the danger from escalating further.

[0033] Throughout the testing process, the oil leak detection mechanism plays a continuous role. A high-sensitivity liquid level sensor 31 (i.e., the oil leak detection probe) installed on the test bench body 38 constantly monitors for oil leaks. When a trace oil leak is detected, the oil leak detection probe 31 transmits a signal to the alarm 39, which then issues an audible and visual alarm to alert the operator. The leaked oil drips into the oil collection tank 17 below the test bench body 38. Through the action of the oil collection ramp 19, the leaked oil flows into the guide pipe 18. The other end of the guide pipe 18 can be pre-connected to an oil storage tank for recycling, preventing oil leaks onto the ground that could cause environmental pollution and resource waste.

[0034] During the cylinder test, the height of the force plate 7 can be adjusted by controlling the first hydraulic cylinder 5, making the force plate 7 suitable for testing cylinders with different stroke lengths. After the test is completed, the extension end of the second hydraulic cylinder 20 is extended and reset, so that the guide rail 24 supports the test platform body 38 through the load-bearing roller 26. At this time, the test platform body 38 is separated from the force column 25. Then, the drive motor 14 runs, and the lead screw 15 drives the protective frame 10 to rise through the L-shaped connecting plate 16. Subsequently, the extension end of the fourth hydraulic cylinder 28 retracts and returns to its original position, moving the test platform body 38 out of the gantry support frame structure 2. Then, the extension end of the third hydraulic cylinder 33 retracts and returns to its original position, and the tested cylinder is removed from the test platform body 38, thus completing the cylinder test.

[0035] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of the present invention is defined by the appended claims and their equivalents.

Claims

1. A pressure testing bench for a large hydraulic cylinder, characterized in that; The system includes a base (1), a test bench body (38), a gantry support frame structure (2), a safety protection mechanism (9), an oil leak detection mechanism, and an oil leak collection mechanism. The base is a basic support structure with an oil receiving groove (17) on its upper surface. The test bench body (38) is located in the oil receiving groove (17). The upper surface of the test bench body (38) is provided with a fixing device for fixing the oil cylinder. The test bench body (38) is rectangular. Load-bearing rollers (26) are fixed at the four corners of the bottom of the test bench body (38). A guide rail structure is provided in the oil receiving groove (17). The test bench body (38) moves forward along the guide rail structure through the load-bearing rollers (26) at its lower end. The safety protection mechanism (9) includes a protective frame (10), a protective net (11), and a sensor assembly. The protective frame (10) is set around the gantry support frame structure (2) and fixedly connected to the outer wall of the gantry support frame structure (2) with bolts to form a closed protective space. The protective net (11) is installed on the protective frame (10). The sensor assembly includes a pressure sensor (8) installed on the gantry support frame structure (2) at the oil cylinder jacking part and a displacement sensor (12) installed on the protective net (11). The oil leakage detection mechanism includes two oil leakage detection probes (31) and an alarm (39). The two oil leakage detection probes (31) are respectively set on the test bench. At two opposite corners of the top surface of the main body (38), the gantry support frame structure (2) is fixed to one side of the top surface of the base (1). The protective frame (10) on the gantry support frame structure (2) near the test bench body (38) is raised and lowered. The raising and lowering process of this protective frame (10) is realized by the screw structure. A controller (37) is fixedly installed on the side wall of the base (1). The guide rail structure includes two guide rails (24) arranged parallel in the oil receiving groove (17). The bottom end of the two guide rails (24) is fixed with the same connecting plate (21). The bottom sides of the connecting plate (21) are symmetrically fixed with first guide rods (23). The first guide rods (23) slide on the top. A guide cylinder (22) is fitted, and the bottom end of the guide cylinder (22) is fixed on the bottom end of the oil receiving groove (17). A second hydraulic cylinder (20) is fixedly installed on the bottom end of the oil receiving groove (17). The telescopic end of the second hydraulic cylinder (20) is fixedly connected to the bottom surface of the connecting plate (21). The load-bearing roller (26) cooperates with the guide slide rail (24). The load-bearing roller (26) rolls forward along the guide slide rail (24). The base (1) is equipped with a hydraulic station and a force column (25). The force column (25) is integrally formed with the base (1). In the initial state, the top surface of the force column (25) is lower than the bottom surface of the test bench body (38). The hydraulic station is electrically connected to the controller (37) through a wire.

2. The pressure testing bench for a large hydraulic cylinder according to claim 1, characterized in that: The oil leakage collection mechanism includes an oil receiving inclined plate (19) and an oil guide pipe (18). The oil receiving inclined plate (19) is fixedly installed in the oil receiving groove (17). The guide slide rail (24) penetrates the oil receiving inclined plate (19) and is slidably connected to it. The oil guide pipe (18) is fixedly connected to the side wall of the base (1) and is connected to the oil receiving groove (17) at the upper end of the oil receiving inclined plate (19).

3. The pressure testing bench for a large hydraulic cylinder according to claim 2, characterized in that: The gantry support frame structure (2) includes four support columns (4) and a force plate (3) fixedly installed between the four support columns (4). The bottom end of the support column (4) is fixed on the top surface of the base (1). A first hydraulic cylinder (5) is fixedly installed at the center of the top surface of the force plate (3). The telescopic end of the first hydraulic cylinder (5) penetrates the force plate (3) and is fixed with a force plate (7). A pressure sensor (8) is installed at the center of the bottom surface of the force plate (7). Four second guide rods (6) are evenly fixed on the top surface of the force plate (7). The top end of the second guide rod (6) penetrates the force plate (3) and is slidably connected at its contact point. The alarm (39) is fixed on the top surface of the support column (4).

4. The pressure testing bench for a large hydraulic cylinder according to claim 3, characterized in that: The lead screw structure includes two L-shaped connecting plates (16) fixed on both sides of the bottom of the protective frame (10). A lead screw (15) is provided through both L-shaped connecting plates (16). The L-shaped connecting plates (16) are threadedly connected to the lead screw (15). The bottom end of the lead screw (15) is rotatably connected to the top surface of the base (1) through a bearing. A drive motor (14) is fixedly connected to the top end of the lead screw (15). The drive motor (14) is fixedly installed on the mounting plate (13). The mounting plate (13) is fixed on the outer wall of the gantry support frame structure (2). The output shaft of the drive motor (14) penetrates the mounting plate (13) and is fixedly connected to the top end of the lead screw (15). The oil leakage detection probe (31), drive motor (14), alarm (39), pressure sensor (8) and displacement sensor (12) are electrically connected to the controller (37) through wires.

5. The pressure testing bench for a large hydraulic cylinder according to claim 3, characterized in that: The force-bearing column (25) is located at the lower end of the force-bearing plate (7), and the top of the force-bearing column (25) penetrates the oil-receiving inclined plate (19) and is sealed and fixedly connected to it at the contact point.

6. The pressure testing bench for a large hydraulic cylinder according to claim 5, characterized in that: The fixing device includes two vertical plates (32) fixed at two opposite corners on the top surface of the test bench body (38). A third hydraulic cylinder (33) is fixedly installed on the opposite side of the two vertical plates (32). The telescopic end of the third hydraulic cylinder (33) penetrates the vertical plate (32) and is fixed with a V-shaped fixing plate (34). A third guide rod (36) is fixed on the side wall of the V-shaped fixing plate (34). The third guide rod (36) penetrates the vertical plate (32) and is slidably connected at its contact point. A plurality of V-shaped clamps (35) are evenly fixed on the inner side of the V-shaped fixing plate (34).

7. The pressure testing bench for a large hydraulic cylinder according to claim 6, characterized in that: A horizontal plate (27) is fixed on one side of the top surface of the base (1). A fourth hydraulic cylinder (28) is fixedly installed on the side wall of the horizontal plate (27). The telescopic end of the fourth hydraulic cylinder (28) penetrates the horizontal plate (27) and is fixed with a connecting block (29). A pin (30) is fixed at the bottom of the connecting block (29). The pin (30) penetrates one edge of the test bench body (38) and is slidably connected to the test bench body (38) up and down. The third hydraulic cylinder (33), the fourth hydraulic cylinder (28), the first hydraulic cylinder (5), and the second hydraulic cylinder (20) are respectively connected to the hydraulic station pipeline through conduits.

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