Pressure test bench of large oil cylinder

Abstract

The invention discloses a pressure test board for a large oil cylinder. The pressure test board comprises a base, a test board body, a gantry support frame structure, a safety protection mechanism, an oil leakage detection mechanism and a leaked oil collection mechanism. According to the invention, the guide mechanism is arranged, and a second hydraulic cylinder is used for lifting a guide slide rail to replace a traditional elastic slide guide rail, so that the problem of jamming and hard friction in the entering process of the test board when a large oil cylinder is heavy-loaded is effectively solved, the service life of the test board is prolonged, and the test efficiency of the test board is improved; the oil cylinder oil leakage detection device can effectively protect operators in the testing process, gives an alarm and takes emergency measures in time when abnormal conditions occur, greatly reduces the probability of safety accidents, realizes real-time monitoring and timely collection of the oil leakage condition of the oil cylinder through the combination of the oil leakage detection mechanism and the oil leakage collection mechanism, and improves the working efficiency. The quality problem of the oil cylinder can be found in time, and environmental pollution and resource waste caused by oil leakage can be avoided.

Description

Technical Field

[0001] The invention relates to the technical field of oil cylinder detection equipment, in particular to a pressure testing bench for a large oil cylinder. Background Art

[0002] In hydraulic systems, the performance of the cylinder, a crucial actuator, directly impacts the efficiency and reliability of the entire system. Therefore, pressure testing the cylinder is crucial for ensuring its quality. Currently, existing cylinder pressure testing rigs, such as those described in Application No. CN201822011160.2, place the cylinder under test onto the test rig via a support platform. By providing elastic sliding guides, the test rig's base ultimately bears the pressure. This rig boasts a simple structure, low manufacturing costs, and a long service life. However, this existing technology has obvious defects: when the oil cylinder to be tested is large and heavy, the weight will exceed the range that the elastic sliding guide rail can bear during the test bench entering the test bench, compressing the spring, causing the test bench to directly contact the base during the entry process, and then causing jamming and hard friction, which not only affects the test efficiency but also accelerates equipment wear; at the same time, this patent does not have any protective structure during the test process. Once the cylinder body explodes or the oil pipe bursts during the test, the flying debris and high-pressure oil will cause serious personal injury to the operator; in addition, the existing technology also lacks an oil leakage detection structure for the test cylinder and a collection structure when leaking oil. It is impossible to detect the oil leakage problem of the cylinder in time, and it is also impossible to effectively collect the leaked oil, which easily causes environmental pollution and waste of resources. Therefore, it is urgent to design a large-scale oil cylinder pressure test bench that can solve the above problems. Summary of the Invention

[0003] In order to solve the above problems, the present invention provides a pressure testing platform for a large oil cylinder.

[0004] The present invention is achieved through the following technical solutions:

[0005] A pressure test bench for a large oil cylinder comprises 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, and an oil receiving groove is provided on its upper surface. The test bench body is arranged in the oil receiving groove. A fixing device for fixing the oil cylinder is provided on the upper surface of the test bench body. The test bench body is rectangular, and load-bearing rollers are respectively fixed at the four corners of the bottom end of the test bench body. A guide rail structure is provided in the oil receiving groove. The test bench body moves along the guide rail structure through the load-bearing rollers at its lower end. The safety protection mechanism comprises a protection frame, a protection net and a sensor assembly. The protection frame is arranged in the gantry support frame structure. The periphery is fixedly connected to the outer wall of the gantry support frame structure by 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 top moving part of the cylinder 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 arranged at two opposite corners of 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 close to the side of the test bench body is set to rise and fall. This protective frame realizes the lifting process through a screw structure, and a controller is fixedly installed on the side wall of the base.

[0006] Preferably, the guide rail structure includes two guide rails arranged in parallel in the oil receiving groove, the bottom ends of the two guide rails are fixed with the same connecting plate, the first guide rods are symmetrically fixed on both sides of the bottom surface of the connecting plate, the first guide rod is slidably sleeved with a guide cylinder, the bottom end of the guide cylinder is fixed on the bottom end of the oil receiving groove, the 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 the load-bearing roller 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 arranged in the oil receiving groove. The guide rail penetrates the oil receiving inclined plate and is sealed and slidably connected to it. The oil guide pipe is fixedly connected to the side wall of the base, and the oil guide pipe is connected to 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 arranged between the four support columns, the bottom end of the support column is fixed on the top surface of the base, and a first hydraulic cylinder is fixedly installed at the center of the top surface of the force plate. The telescopic end of the first hydraulic cylinder penetrates the force plate and is fixed with a force plate, and a pressure sensor is installed at the center of the bottom surface of the force plate. Four second guide rods are evenly fixed on the top surface of the force plate, and the top end of the second guide rod penetrates the force plate and is slidably connected at the contact point, and the alarm is fixed on the top surface of the support column.

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

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

[0011] Preferably, the fixing device includes two vertical plates fixed at two diagonal positions on the top surface of the test bench body, and a third hydraulic cylinder is fixedly installed on opposite sides of the two vertical plates. The telescopic end of the third hydraulic cylinder penetrates the vertical plates 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 plates and is slidably connected at the contact point thereof, and a plurality of V-shaped clamping plates are evenly fixed on the inner side of the V-shaped fixing plate.

[0012] Preferably, a horizontal plate is fixed on 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 the edge of one side of the test bench body, and the pin is connected to the test bench body for up and down sliding connection. 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 the existing technology, the beneficial effects of the present invention are:

[0014] 1. The present invention sets a guide mechanism and uses a second hydraulic cylinder to lift the guide rail to replace the traditional elastic sliding rail, effectively solving the problem of jamming and hard friction during the entry of the test bench when the large oil cylinder is heavily loaded, thereby improving the service life and testing efficiency of the test bench.

[0015] 2. The setting of safety protection mechanism can effectively protect the operators during the test process. When abnormal situations occur, alarms are issued in time and emergency measures are taken, which greatly reduces the probability of safety accidents.

[0016] 3. The combination of oil leakage detection mechanism and oil leakage collection mechanism realizes real-time monitoring and timely collection of the oil leakage of the oil cylinder, which not only can find the quality problem of the oil cylinder in time, but also can avoid environmental pollution and resource waste caused by oil leakage, and has good economic and environmental benefits. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 is a perspective view of the structure described in the present application;

[0018] Figure 2 is a sectional view of the structure described in the present application;

[0019] Figure 3 is a perspective view of the structure described in the present application Figure 1 ;

[0020] Figure 4 is a top view of the structure described in the present application.

[0021] In the figure: base 1, gantry support frame structure 2, stress plate 3, support column 4, first hydraulic cylinder 5, second guide rod 6, stress disc 7, pressure sensor 8, safety protection mechanism 9, protection frame 10, protection net 11, displacement sensor 12, mounting plate 13, driving motor 14, lead screw 15, L-shaped connecting plate 16, oil receiving groove 17, oil guide pipe 18, oil receiving inclined plate 19, second hydraulic cylinder 20, connecting plate 21, guide cylinder 22, first guide rod 23, guide slide rail 24, stress column 25, load bearing roller 26, cross plate 27, fourth hydraulic cylinder 28, connecting block 29, bolt 30, oil leakage detection probe 31, vertical plate 32, third hydraulic cylinder 33, V-shaped fixed plate 34, V-shaped clamping plate 35, third guide rod 36, controller 37, test bench body 38, alarm 39. DETAILED DESCRIPTION

[0022] The present application will be further described in detail below in combination with the drawings and specific embodiments:

[0023] As Figure 1 , Figure 2 , Figure 3 , Figure 4As shown, a pressure test bench for a large oil 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, and an oil receiving groove 17 is opened on its upper surface. The test bench body 38 is arranged in the oil receiving groove 17. A fixing device for fixing the oil cylinder is provided on the upper surface of the test bench body 38. The test bench body 38 is rectangular in shape, and load-bearing rollers 26 are fixed at the four corners of the bottom end 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 through the load-bearing rollers 26 at its lower end. The safety protection mechanism 9 includes a protection frame 10, a protection net 11 and a sensor assembly. The protection frame 10 is arranged in the gantry support frame structure The periphery 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 top moving part of the cylinder 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 arranged at two diagonal positions 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, and the protective frame 10 on the gantry support frame structure 2 close to the side of the test bench body 38 is set to rise and fall, and this protective frame 10 realizes the lifting process through a screw structure, and 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 in the oil receiving groove 17, and the same connecting plate 21 is fixed to the bottom end of the two guide rails 24. First guide rods 23 are symmetrically fixed on both sides of the bottom surface of the connecting plate 21. A guide cylinder 22 is slidably sleeved on the first guide rod 23, and the bottom end of the guide cylinder 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, and the load-bearing roller 26 cooperates with the guide rail 24, and the load-bearing roller 26 rolls forward along the guide rail 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 arranged in the oil receiving groove 17. The guide rail 24 penetrates the oil receiving inclined plate 19 and is sealed and slidably connected to it. The oil guide pipe 18 is fixedly connected to the side wall of the base 1, and the oil guide pipe 18 is connected to 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 arranged between the four support columns 4. The bottom end of the support column 4 is fixed on the top surface of the base 1. The 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 with a force-bearing plate 7. The 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 the contact point. The alarm 39 is fixed on the top surface of the support column 4.

[0027] The screw structure includes two L-shaped connecting plates 16 fixed on both sides of the bottom of the protective frame 10, and a screw 15 is passed through the two L-shaped connecting plates 16. The L-shaped connecting plates 16 are threadedly connected to the screw 15. The bottom end of the screw 15 is rotatably connected to the top surface of the base 1 through a bearing. The top of the screw 15 is fixedly connected to the drive motor 14, and the drive motor 14 is fixedly mounted 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 of the screw 15. The oil leakage detection probe 31, the drive motor 14, the alarm 39, the pressure sensor 8 and the displacement sensor 12 are respectively electrically connected to the controller 37 through wires.

[0028] A hydraulic station and a load-bearing column 25 are provided in the base 1. The load-bearing column 25 is integrally formed with the base 1. The load-bearing column 25 is arranged at the lower end of the load-bearing plate 7, and the top end of the load-bearing column 25 penetrates the oil receiving inclined plate 19 and is sealed and fixedly connected with the contact point. In the initial state, the top surface of the load-bearing column 25 is lower than the bottom surface of the test bench body 38, and the hydraulic station is electrically connected to the controller 37 through a wire.

[0029] The fixing device includes two vertical plates 32 fixed at two diagonal positions on the top surface of the test bench body 38. A third hydraulic cylinder 33 is fixedly installed on the opposite sides of the two vertical plates 32. The telescopic end of the third hydraulic cylinder 33 penetrates the vertical plates 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 plates 32 and is slidably connected at the contact point. A plurality of V-shaped clamping plates 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, and 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 the edge of one side of the test bench body 38, and the pin 30 is connected to the test bench body 38 for sliding up and down connection. 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: During the test preparation phase, the large oil cylinder to be tested is first placed vertically on the test bench body 38. The large oil cylinder is then secured by a fixture, and the third hydraulic cylinder 33 is activated by a controller 37, controlling the synchronous extension of the telescopic ends of the two third hydraulic cylinders 33. This allows the large oil cylinder to be clamped and fixed between two sets of multiple V-shaped clamps 35, ensuring that the cylinder does not move during the test. Then, the fourth hydraulic cylinder 28 is started by the controller 37, and the telescopic end of the fourth hydraulic cylinder 28 is controlled to extend, and the test bench body 38 is pushed into the gantry support frame structure 2 through the fourth hydraulic cylinder 28. When the test bench body 38 enters the gantry support frame structure 2 with the oil cylinder, the drive motor 14 receives the command of the controller 37 to operate, and the drive motor 14 drives the screw 15 to rotate. The screw 15 moves down the protective frame 10 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 of the controller 37 to operate, and the telescopic end of the second hydraulic cylinder 20 retracts. At this time, the two guide rails 24 descend, and the load-bearing roller 26 at the lower end of the test bench body 38 is suspended and separated from the guide rails 24. The bottom surface of the test bench body 38 is in contact with the top surface of the load-bearing column 25. In this way, 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 to inject pressurized oil into the cylinder for pressure testing. At this point, the retracted end of the oil cylinder abuts against the force plate 7. Pressure sensor 8, mounted on this plate, monitors the pressure changes transmitted from the oil cylinder in real time and transmits this pressure data to the control system. During normal testing, the safety mechanism 9's protective frame 10 and protective net 11 surround the test area, creating an enclosed space to prevent accidental debris or oil splashes from injuring the operator.

[0032] Once an abnormal situation occurs, such as the pressure sensor 8 detects an abnormal increase in the internal pressure of the oil cylinder, or the displacement sensor 12 installed on the protective frame 10 detects that the protective net 11 is deformed due to a large impact force, the control system will immediately respond, sound an alarm and light up the warning light 39, while stopping the test program, quickly starting emergency protection measures, closing the hydraulic station oil circuit valve, cutting off the pressure source of the oil cylinder, and avoiding further expansion of the danger.

[0033] During the whole test process, the oil leakage detection mechanism is continuously in action. The high-sensitivity liquid level sensor 31 (i.e. the oil leakage detection probe) arranged on the test bench body 38 detects whether there is oil leakage at any time. When detecting a trace of oil leakage, the oil leakage detection probe 31 transmits a signal to the alarm 39, and the alarm 39 gives an audible and visual alarm to remind the operator. The leaked oil drops into the oil collection groove 17 below the test bench body 38, and through the action of the oil collection inclined plate 19, the leaked oil flows to the oil guide pipe 18. The other end of the oil guide pipe 18 can be connected to an oil storage tank in advance for recycling, preventing the oil from leaking to the ground to cause environmental pollution and resource waste.

[0034] During the test process of the oil cylinder, the height of the force receiving disc 7 can be adjusted by controlling the first hydraulic cylinder 5, so that the force receiving disc 7 is suitable for the test work of oil cylinders with different stroke lengths. After the test work is completed, the extension end of the second hydraulic cylinder 20 is controlled to extend and reset, so that the guide rail 24 is supported by the load bearing roller 26 to hold the test bench body 38. At this time, the test bench body 38 is separated from the force receiving column 25. At this time, the driving motor 14 is operated, the lead screw 15 drives the protective frame 10 to rise through the L-shaped connecting plate 16. Then, the extension end of the fourth hydraulic cylinder 28 is retracted to reset, and the test bench body 38 is removed from the gantry support frame structure 2. The extension end of the third hydraulic cylinder 33 is retracted to reset, and the tested oil cylinder is removed from the test bench body 38. Thus, the test work of the oil cylinder is completed.

[0035] The basic principles, main features and advantages of the present application are shown and described above. It should be understood by those skilled in the art that the present application is not limited by the above embodiments, and the above embodiments and descriptions in the specification are only to illustrate the principles of the present application. Without departing from the spirit and scope of the present application, various changes and improvements can be made to the present application, and these changes and improvements all fall within the scope of the present application. The scope of protection of the present application is defined by the appended claims and their equivalents.

Claims

1. A pressure test bench for large oil cylinders, characterized by: The invention comprises 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, and an oil receiving groove (17) is provided on its upper surface. The test bench body (38) is arranged in the oil receiving groove (17). A fixing device for fixing the oil cylinder is provided on the upper surface of the test bench body (38). The test bench body (38) is rectangular in shape. Load-bearing rollers (26) are fixed at the four corners of the bottom end 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 through the load-bearing rollers (26) at its lower end. The safety protection mechanism (9) comprises a protection frame (10), a protection net (11) and a sensor assembly. The protection frame (10) is arranged on the periphery of the gantry support frame structure (2) and is fixed by screws. The bolt is fixedly connected to the outer wall of the gantry support frame structure (2) 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 top moving part of the oil cylinder 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 arranged at two diagonal positions 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) close to the side of the test bench body (38) is arranged to rise and fall. The protective frame (10) realizes the lifting process through a screw structure. A controller (37) is fixedly installed on the side wall of the base (1).

2. The pressure test bench for a large oil cylinder according to claim 1, characterized in that: The guide rail structure comprises two guide rails (24) arranged in parallel in the oil receiving groove (17), the bottom ends of the two guide rails (24) are fixed with a same connecting plate (21), the two sides of the bottom surface of the connecting plate (21) are symmetrically fixed with first guide rods (23), the first guide rods (23) are slidably sleeved with a guide cylinder (22), the bottom end of the guide cylinder (22) is fixed to the bottom end of the oil receiving groove (17), the 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 rail (24), and the load-bearing roller (26) rolls forward along the guide rail (24).

3. The pressure test bench for a large oil cylinder according to claim 2, characterized in that: The oil leakage collection mechanism comprises an oil receiving inclined plate (19) and an oil guide pipe (18). The oil receiving inclined plate (19) is fixedly arranged in the oil receiving groove (17). The guide rail (24) penetrates the oil receiving inclined plate (19) and is sealed and slidably connected thereto. The oil guide pipe (18) is fixedly connected to the side wall of the base (1), and the oil guide pipe (18) is communicated with the oil receiving groove (17) at the upper end of the oil receiving inclined plate (19).

4. The pressure test bench for a large oil cylinder according to claim 3, characterized in that: The gantry support frame structure (2) includes four support columns (4) and a load-bearing plate (3) fixedly arranged between the four support columns (4), the bottom ends of the support columns (4) are 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 load-bearing plate (3), the telescopic end of the first hydraulic cylinder (5) penetrates the load-bearing plate (3) and is fixed with a load-bearing disk (7), a pressure sensor (8) is installed at the center of the bottom surface of the load-bearing disk (7), four second guide rods (6) are evenly fixed on the top surface of the load-bearing disk (7), the top ends of the second guide rods (6) penetrate the load-bearing plate (3) and are slidably connected at the contact point thereof, and the alarm (39) is fixed on the top surface of the support column (4).

5. The pressure test bench for a large oil cylinder according to claim 4, characterized in that: The screw structure includes two L-shaped connecting plates (16) fixed on both sides of the bottom of the protective frame (10), and a 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 screw (15), and the bottom end of the screw (15) is rotatably connected to the top surface of the base (1) through a bearing. The top end of the screw (15) is fixedly connected to a drive motor (14), and the drive motor (14) is fixedly mounted on a 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 screw (15). The oil leakage detection probe (31), the drive motor (14), the alarm (39), the pressure sensor (8) and the displacement sensor (12) are respectively electrically connected to the controller (37) through wires.

6. The pressure test bench for a large oil cylinder according to claim 4, characterized in that: A hydraulic station and a load-bearing column (25) are provided in the base (1). The load-bearing column (25) is integrally formed with the base (1). The load-bearing column (25) is provided at the lower end of the load-bearing plate (7). The top end of the load-bearing column (25) penetrates the oil receiving inclined plate (19) and is sealed and fixedly connected to the contact portion thereof. In an initial state, the top surface of the load-bearing column (25) is lower than the bottom surface of the test bench body (38). The hydraulic station is electrically connected to the controller (37) via a wire.

7. The pressure test bench for a large oil cylinder according to claim 6, characterized in that: The fixing device includes two vertical plates (32) fixed at two diagonal positions on the top surface of the test bench body (38), and third hydraulic cylinders (33) are fixedly installed on opposite sides of the two vertical plates (32). The telescopic end of the third hydraulic cylinder (33) penetrates the vertical plates (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 plates (32) and is slidably connected at the contact point thereof. A plurality of V-shaped clamping plates (35) are evenly fixed on the inner side of the V-shaped fixing plate (34).

8. The pressure test bench for a large oil cylinder according to claim 7, characterized in that: A transverse plate (27) is fixed on one side of the top surface of the base (1), and a fourth hydraulic cylinder (28) is fixedly installed on the side wall of the transverse plate (27). The telescopic end of the fourth hydraulic cylinder (28) penetrates the transverse plate (27) and is fixed with a connecting block (29). A latch (30) is fixed at the bottom end of the connecting block (29). The latch (30) penetrates the edge of one side of the test bench body (38), and the latch (30) is connected to the test bench body (38) in an upward and downward sliding manner. 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 a conduit.

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