CN220415907U - Test device of pneumatic cylinder - Google Patents

Abstract

The utility model relates to the technical field of hydraulic cylinders, in particular to a test device of a hydraulic cylinder, which can lock and support the test device, avoid the reaction force from damaging the structure of the device and improve the service life and the reliability of the device; the hydraulic pushing device comprises a frame, a sliding table, a hydraulic pushing cylinder, a pressure sensor and a pressing block, wherein the sliding table is slidably arranged on an upper beam, the hydraulic pushing cylinder is arranged on the sliding table, a piston rod of the hydraulic pushing cylinder is provided with the pressure sensor, and the pressing block is arranged on the pressure sensor; the hydraulic lifting device comprises a rack, and is characterized by further comprising a clamping mechanism, rotating supporting blocks, swing rods and pull rods, wherein the clamping mechanism is used for clamping a hydraulic cylinder, the two rotating supporting blocks are respectively and rotatably arranged on two sides of the sliding table, the upper ends of the two swing rods are respectively and fixedly connected with the two rotating supporting blocks, the lower ends of the pull rods are connected with piston rods of the hydraulic pushing cylinders, pin shafts of the two swing rods are slidably arranged in long sliding grooves of the pull rods, and the piston rods of the hydraulic pushing cylinders extend to rotate by pulling the two swing rods through the pull rods, so that the two rotating supporting blocks are rotatably supported on an upper beam of the rack.

Description

Test device of pneumatic cylinder

Technical Field

The utility model relates to the technical field of hydraulic cylinders, in particular to a test device of a hydraulic cylinder.

Background

The hydraulic cylinder is a hydraulic executive component which converts hydraulic energy into mechanical energy and performs linear reciprocating motion (or swinging motion), has simple structure and reliable work, can avoid a speed reducing device when being used for realizing reciprocating motion, has no transmission clearance and stable motion, and is widely applied to hydraulic systems of various machines, and the hydraulic cylinder needs to be inspected and tested in the production process.

In the prior art, various test devices are proposed, for example, a hydraulic cylinder performance test fixture is proposed in Chinese utility model patent with patent number ZL202223323844.9, the device applies lateral force to an output shaft of a hydraulic telescopic rod through a set hydraulic cylinder, and the device is convenient for detecting the magnitude of the pressure applied by the hydraulic cylinder through a set pressure sensor, so that the lateral force of a frame is convenient to control in a theoretical numerical value region.

However, the device lacks a locking and supporting structure, and the reaction force of the hydraulic oil cylinder directly acts on the guide rod and the ball screw, so that the guide rod and the ball screw are easy to deform, and the service life of the device is influenced.

Disclosure of Invention

In order to solve the technical problems, the utility model provides the test device of the hydraulic cylinder, which can lock and support the test device, avoid the reaction force from damaging the structure of the device, and improve the service life and the reliability of the device.

The utility model relates to a test device of a hydraulic cylinder, which comprises a frame, a sliding table, a hydraulic pushing cylinder, a pressure sensor and a pressing block, wherein the frame is provided with a bottom plate and an upper beam; the hydraulic lifting device comprises a rack, a hydraulic pushing cylinder, a clamping mechanism, a rotating support block, swing rods and pull rods, wherein the clamping mechanism is used for clamping the hydraulic cylinder, the two rotating support blocks are respectively installed on the front side and the rear side of the sliding table through shaft rods in a rotating mode, a certain gap is formed between the inner sides of the upper end faces of the two rotating support blocks and the lower end face of an upper beam of the rack, the upper ends of the two swing rods are respectively fixedly connected with the shaft rods of the two rotating support blocks, the lower ends of the two swing rods are respectively connected with the lower ends of the pull rods through pin shafts in a rotating mode, the upper parts of the pull rods are provided with long sliding grooves, the pin shafts of the two swing rods are slidably installed in the long sliding grooves of the pull rods, and the piston rods of the hydraulic pushing cylinder extend to pull the two swing rods through the pull rods to rotate, so that the two rotating support blocks are rotatably supported on the upper beam of the rack; during the test, load fixture with the stiff end of pneumatic cylinder on, the piston rod of operating the pneumatic cylinder is elongated, actuating mechanism drive slip table slides, make the briquetting aim at the assigned position of the piston rod of the pneumatic cylinder that is tested, the piston rod of hydraulic pushing cylinder is elongated and is compressed tightly the briquetting on above-mentioned piston rod, the hydraulic pushing cylinder continues to be elongated, detect test pressure through pressure sensor, and detect the deflection of the piston rod of being tested the pneumatic cylinder, the pull rod descends along with the piston rod extension of hydraulic pushing cylinder simultaneously, the long spout of pull rod pulls the round pin axle of two pendulum rods downwards, make the lower part of two pendulum rods rotate downwards round the axostylus axostyle of two rotation supporting pieces, make the upper end of two rotation supporting pieces inwards rotate the lower extreme face of supporting on the upper beam of frame, thereby make two rotation supporting pieces lock and support the slip table, avoid the reaction force of test hydraulic pushing cylinder to act on actuating mechanism, the structural damage of actuating mechanism that causes, thereby improve the life and the reliability of device.

Preferably, the sliding table further comprises two torsion springs, wherein the two torsion springs are respectively connected with the shaft rods of the two rotation support blocks and the two sides of the sliding table, and the two rotation support blocks are elastically rotated to the outer side of the sliding table by the elasticity of the two torsion springs; by arranging the two torsion springs, the two rotation support blocks are kept in a state of being outwards opened to be separated from the upper beam of the frame when no test is performed, so that collision and interference are avoided.

The driving mechanism comprises a sliding rail, a ball screw and a driving motor, the sliding rail is arranged on the lower end face of an upper beam of the frame, the sliding table is slidably arranged on the sliding rail, the ball screw is rotatably arranged below the upper beam of the frame, the ball screw is rotatably connected with the sliding table through a screw nut, the driving motor is arranged on the frame, and the driving motor is in transmission connection with the ball screw; the driving motor drives the ball screw to rotate, the ball screw drives the sliding table to move along the sliding rail through the screw nut, the pressing block can be accurately aligned with the appointed position of the piston rod of the tested hydraulic cylinder, the technology is mature, and automatic control is realized through programming.

The clamping mechanism comprises a lower supporting block, an upper pressing block, an elastic pull rod and an elastic hanging rod, wherein the lower supporting block is arranged on a bottom plate of the machine frame, the upper pressing block cover is buckled on the lower supporting block, opposite V-shaped grooves are formed in the middle of the opposite surfaces of the lower supporting block and the upper pressing block, the V-shaped grooves are used for clamping the fixed end of a tested hydraulic cylinder, the lower end of the elastic pull rod is rotationally connected with the side wall of the lower supporting block, the upper end of the elastic pull rod is rotationally connected with the side wall of the upper pressing block, the lower end of the elastic hanging rod is rotationally connected with the other side wall of the lower supporting block, and the upper end of the elastic hanging rod is detachably clamped with the other side wall of the upper pressing block; the upper end of the elastic hanging rod is clamped onto the upper pressing block through the fixed end of the tested hydraulic cylinder, so that the elastic pull rod and the elastic hanging rod lock the lower supporting block and the upper pressing block from two sides to be tensioned, the operation is simple, and the clamping is stable.

The device also comprises a plurality of gaskets which are respectively arranged on the inner walls of the V-shaped grooves of the lower supporting block and the upper pressing block; the gasket pads are arranged between the lower supporting block, the upper pressing block and the fixed end of the tested hydraulic cylinder, so that the tested hydraulic cylinder is prevented from being damaged.

Preferably, the hydraulic lifting device further comprises a driving plate, a first pulley, a thrust plate, a second pulley, a pull rope and an auxiliary push rod, wherein the driving plate is slidably arranged at the lower part of the lower supporting block, the lower ends of the elastic pull rod and the elastic hanging rod are respectively in rotary connection with two sides of the driving plate, the first pulley is arranged on a bottom plate of a frame below the driving plate, the thrust plate is slidably arranged on the bottom plate of the frame in a lifting manner, the second pulley is arranged on the lower end face of the thrust plate and is lower than the driving plate, one end of the pull rope is connected with an upper beam upright post of the frame, the other end of the pull rope is connected with the bottom of the driving plate, the middle part of the pull rope bypasses the second pulley and the first pulley, the auxiliary push rod is arranged on a piston rod of the hydraulic pushing cylinder, and the lower end of the auxiliary push rod is positioned above the thrust plate; when the extension of the piston rod of the hydraulic push cylinder tests the piston rod of the tested hydraulic cylinder, the piston rod of the hydraulic push cylinder drives the auxiliary push rod to descend so as to push the thrust plate to descend, the thrust plate downwards pushes the middle part of the inhaul cable through the pulley, one end of the inhaul cable downwards pulls the driving plate after being guided by the pulley I, the driving plate downwards tightens the upper pressing block through the elastic pull rod and the elastic hanging rod, and accordingly the fixed end is also stressed when the piston rod of the tested hydraulic cylinder is stressed, the whole stress of the hydraulic cylinder is balanced, and the tested hydraulic cylinder is prevented from being stressed, deflected and overturned.

Preferably, the device further comprises a plurality of guide rods, wherein the upper ends of the guide rods are connected with the thrust plate, the lower parts of the guide rods are slidably arranged in the sliding sleeve of the bottom plate of the frame, and the guide rods guide the thrust plate; the thrust plate is guided by the guide rods, so that the sliding stability of the thrust plate is improved.

Compared with the prior art, the utility model has the beneficial effects that: during the test, load fixture with the stiff end of pneumatic cylinder on, the piston rod of operating the pneumatic cylinder is elongated, actuating mechanism drive slip table slides, make the briquetting aim at the assigned position of the piston rod of the pneumatic cylinder that is tested, the piston rod of hydraulic pushing cylinder is elongated and is compressed tightly the briquetting on above-mentioned piston rod, the hydraulic pushing cylinder continues to be elongated, detect test pressure through pressure sensor, and detect the deflection of the piston rod of being tested the pneumatic cylinder, the pull rod descends along with the piston rod extension of hydraulic pushing cylinder simultaneously, the long spout of pull rod pulls the round pin axle of two pendulum rods downwards, make the lower part of two pendulum rods rotate downwards round the axostylus axostyle of two rotation supporting pieces, make the upper end of two rotation supporting pieces inwards rotate the lower extreme face of supporting on the upper beam of frame, thereby make two rotation supporting pieces lock and support the slip table, avoid the reaction force of test hydraulic pushing cylinder to act on actuating mechanism, the structural damage of actuating mechanism that causes, thereby improve the life and the reliability of device.

Drawings

FIG. 1 is a schematic diagram of the structure of the present utility model;

FIG. 2 is a schematic view of the front cross-section of the present utility model;

FIG. 3 is a schematic structural view of structures such as a sliding table, a hydraulic pushing cylinder, a pressure sensor, a pressing block, a rotating support block, a swinging rod, a pull rod, a torsion spring and the like;

FIG. 4 is a schematic view of the structure of the clamping mechanism and the like;

FIG. 5 is a schematic view of the bottom view of the structure of the clamping mechanism;

fig. 6 is a schematic structural view of the lower support block, the upper pressing block, the elastic pull rod, the elastic hanging rod, the driving plate and other structures of the clamping mechanism.

In the accompanying drawings: 1. a frame; 2. a sliding table; 3. a hydraulic pushing cylinder; 4. a pressure sensor; 5. briquetting; 6. rotating the supporting block; 7. swing rod; 8. a pull rod; 9. a torsion spring; 10. a lower support block; 11. pressing into blocks; 12. an elastic pull rod; 13. an elastic hanging rod; 14. a driving plate; 15. a pulley I; 16. a thrust plate; 17. a second pulley; 18. a guy cable; 19. an auxiliary push rod; 20. a guide rod; 21. a gasket; 22. a slide rail; 23. a ball screw; 24. and driving the motor.

Detailed Description

In order that the utility model may be understood more fully, the utility model will be described with reference to the accompanying drawings.

Examples

As shown in fig. 1, 2 and 3, a hydraulic cylinder testing device comprises a frame 1, a sliding table 2, a hydraulic pushing cylinder 3, a pressure sensor 4 and a pressing block 5, wherein the frame 1 is provided with a bottom plate and an upper beam, the sliding table 2 is inversely and slidably arranged on the upper beam, a driving mechanism drives the sliding table 2 to move, the hydraulic pushing cylinder 3 is arranged on the lower end surface of the sliding table 2, the top end of a piston rod of the hydraulic pushing cylinder 3 is provided with the pressure sensor 4, and the pressing block 5 is arranged on the lower end surface of the pressure sensor 4; the hydraulic lifting device comprises a rack 1, a hydraulic pushing cylinder 3, a hydraulic pushing cylinder 8, a clamping mechanism, rotating support blocks 6, swing rods 7 and pull rods 8, wherein the clamping mechanism is used for clamping the hydraulic cylinder, the two rotating support blocks 6 are respectively installed on the front side and the rear side of the rack 2 through shaft rods in a rotating mode, a certain gap is formed between the inner sides of the upper end faces of the two rotating support blocks 6 and the lower end faces of an upper beam of the rack 1, the upper ends of the two swing rods 7 are respectively fixedly connected with the shaft rods of the two rotating support blocks 6, the lower ends of the two swing rods 7 are respectively connected with the lower ends of the pull rods 8 through pin shafts in a rotating mode, the lower ends of the pull rods 8 are connected with the piston rods of the hydraulic pushing cylinder 3, long sliding grooves are formed in the upper portions of the pull rods 8 in a sliding mode, and the piston rods of the hydraulic pushing cylinder 3 extend to pull the two swing rods 7 through the pull rods 8 to rotate, so that the two rotating support blocks 6 are rotatably supported on the upper beam of the rack 1; the sliding table further comprises two torsion springs 9, wherein the two torsion springs 9 are respectively connected with the shaft rods of the two rotation support blocks 6 and the two sides of the sliding table 2, and the elasticity of the two torsion springs 9 elastically rotates the two rotation support blocks 6 towards the outer side of the sliding table 2; the driving mechanism comprises a sliding rail 22, a ball screw 23 and a driving motor 24, wherein the sliding rail 22 is arranged on the lower end face of an upper beam of the frame 1, the sliding table 2 is slidably arranged on the sliding rail 22, the ball screw 23 is rotatably arranged below the upper beam of the frame 1, the ball screw 23 is rotatably connected with the sliding table 2 through a screw nut, the driving motor 24 is arranged on the frame 1, and the driving motor 24 is in transmission connection with the ball screw 23.

During the test, load the stiff end of pneumatic cylinder on fixture, the piston rod of operating the pneumatic cylinder is elongated, driving motor 24 drive ball screw 23 rotates, ball screw 23 passes through lead screw nut drive slip table 2 and removes along slide rail 22, make briquetting 5 can be accurate aim at the assigned position of being tested pneumatic cylinder piston rod, make briquetting 5 aim at the assigned position of being tested pneumatic cylinder's piston rod, two torsional springs 9 make two rotation supporting pieces 6 keep outwards opening the state that breaks away from with the upper beam of frame 1 when not carrying out the test, avoid colliding with and interfering, the piston rod extension of hydraulic cylinder 3 compresses tightly briquetting 5 on above-mentioned piston rod, hydraulic cylinder 3 continues to extend, detect test pressure through pressure sensor 4, and detect the deflection of the piston rod of being tested the pneumatic cylinder, simultaneously, pull rod 8 follows the piston rod extension of hydraulic cylinder 3 and descends, the long spout of pull rod 8 makes the round pin axle axial downward pulling of two pendulum rods 7, make the lower part of two pendulum rods 7 rotate about the axostylus axostyle of two rotation supporting pieces 6, make the upper end rotation supporting pieces 6 inwards rotate the state that supports on the upper end face of frame 1, thereby prevent collision and interference, the piston rod extension of hydraulic cylinder 3 continues the load bearing device, thereby the load bearing device is used for the life-span of the test, the device is improved and the life-span of the device is guaranteed.

As shown in fig. 4, 5 and 6, the clamping mechanism comprises a lower supporting block 10, an upper pressing block 11, an elastic pull rod 12 and an elastic hanging rod 13, wherein the lower supporting block 10 is arranged on a bottom plate of the frame 1, the upper pressing block 11 is covered and buckled on the lower supporting block 10, opposite V-shaped grooves are formed in the middle parts of opposite surfaces of the lower supporting block 10 and the upper pressing block 11, the V-shaped grooves are used for clamping a fixed end of a tested hydraulic cylinder, the lower end of the elastic pull rod 12 is rotationally connected with the side wall of the lower supporting block 10, the upper end of the elastic pull rod 12 is rotationally connected with the side wall of the upper pressing block 11, the lower end of the elastic hanging rod 13 is rotationally connected with the other side wall of the lower supporting block 10, and the upper end of the elastic hanging rod 13 is detachably clamped with the other side wall of the upper pressing block 11; the device also comprises a plurality of gaskets 21, wherein the gaskets 21 are respectively arranged on the inner walls of the V-shaped grooves of the lower support block 10 and the upper pressing block 11; the hydraulic lifting device further comprises a driving plate 14, a pulley I15, a thrust plate 16, a pulley II 17, a pull rope 18 and a secondary push rod 19, wherein the driving plate 14 is slidably arranged at the lower part of the lower supporting block 10, the lower ends of the elastic pull rod 12 and the elastic hanging rod 13 are respectively and rotatably connected with two sides of the driving plate 14, the pulley I15 is arranged on a bottom plate of the frame 1 below the driving plate 14, the thrust plate 16 is slidably arranged on the bottom plate of the frame 1 in a lifting manner, the pulley II 17 is arranged on the lower end surface of the thrust plate 16, the pulley II 17 is lower than the driving plate 14, one end of the pull rope 18 is connected with an upper beam upright of the frame 1, the other end of the pull rope 18 is connected with the bottom of the driving plate 14, the middle part of the pull rope 18 bypasses the pulley II 17 and the pulley I15, the secondary push rod 19 is arranged on a piston rod of the hydraulic pushing cylinder 3, and the lower end of the secondary push rod 19 is positioned above the thrust plate 16; the thrust plate 16 is guided by the plurality of guide rods 20, wherein the upper ends of the plurality of guide rods 20 are connected with the thrust plate 16, the lower parts of the plurality of guide rods 20 are slidably arranged in the sliding sleeve of the bottom plate of the frame 1.

The upper end of the elastic hanging rod 13 is clamped on the upper pressing block 11 through the lower supporting block 10 and the upper pressing block 11, so that the elastic pulling rod 12 and the elastic hanging rod 13 lock and tighten the lower supporting block 10 and the upper pressing block 11 from two sides, a plurality of gaskets 21 are arranged between the lower supporting block 10 and the upper pressing block 11 and the fixed end of the tested hydraulic cylinder in a cushioning mode, damage to the tested hydraulic cylinder is avoided, when the extension of a piston rod of the hydraulic pushing cylinder 3 tests the piston rod of the tested hydraulic cylinder, the piston rod of the hydraulic pushing cylinder 3 drives the auxiliary pushing rod 19 to descend to push the pushing plate 16 to descend, the guide rods 20 guide the pushing plate 16, the pushing plate 16 downwards pushes the middle of the inhaul cable 18 through the pulley two 17, one end of the inhaul cable 18 downwards pulls the driving plate 14 after being guided by the pulley one 15, so that the driving plate 14 downwards tightens the upper pressing block 11 through the elastic pulling rod 12 and the elastic hanging rod 13, the whole stressed fixed end of the tested hydraulic cylinder is simultaneously increased when the piston rod of the tested hydraulic cylinder is stressed, and deflection of the tested hydraulic cylinder is avoided.

As shown in fig. 1 to 6, in the test device for the hydraulic cylinder, when the test device for the hydraulic cylinder works, firstly, the fixed ends of the hydraulic cylinder are loaded between the lower supporting block 10 and the upper pressing block 11, the piston rods of the hydraulic cylinder are operated to extend, the driving motor 24 drives the ball screw 23 to rotate and drive the sliding table 2 to slide, so that the pressing block 5 is aligned with the appointed position of the piston rod of the tested hydraulic cylinder, then the piston rod of the hydraulic cylinder 3 extends to press the pressing block 5 on the piston rod, the pull rod 8 extends to descend along with the piston rod of the hydraulic cylinder 3, the long sliding groove of the pull rod 8 pulls the pin shafts of the two swinging rods 7 downwards, so that the lower parts of the two swinging rods 7 rotate downwards around the shaft rods of the two rotating supporting blocks 6, the upper ends of the two rotating supporting blocks 6 rotate inwards and are supported on the lower end face of the upper beam of the frame 1, the two rotating supporting blocks 6 lock and support the sliding table 2, then the hydraulic cylinder 3 continues to extend, the pressure sensor 4 detects the test pressure, and detects the deformation of the piston rod of the tested hydraulic cylinder, finally, the push rod 19 drives the push rod 19 to descend along with the push rod plate 16 to descend, and the push rod 16 descends to the push rod 16 to the middle part of the push rod 14 through the push rod 18, and the pull rod 13 is pulled downwards, and the pull rod 14 to the middle part to pass through the push rod 16 to the push rod 13 to the push rod 13 downwards.

The main functions realized by the utility model are as follows:

1. the sliding table 2 is locked and supported by using the two rotary supporting blocks 6, so that the structural damage of the driving mechanism caused by the reaction force of the test hydraulic pushing cylinder 3 acting on the driving mechanism is avoided, and the service life and reliability of the device are improved;

2. the fixed end is also additionally stressed when the piston rod of the tested hydraulic cylinder is stressed, the whole stress of the hydraulic cylinder is balanced, and the hydraulic cylinder is prevented from being stressed, deflected and overturned;

the test position can be flexibly adjusted.

Claims (7)

1. The utility model provides a test device of pneumatic cylinder, including frame (1), slip table (2), hydraulic pressure pushes away jar (3), pressure sensor (4) and briquetting (5), frame (1) is provided with bottom plate and upper beam, slip table (2) inversion slidable mounting is on the upper beam, actuating mechanism drive slip table (2) remove, hydraulic pressure pushes away jar (3) and installs on the lower terminal surface of slip table (2), hydraulic pressure sensor (4) are installed on the top of the piston rod of hydraulic pressure pushes away jar (3), briquetting (5) are installed on the lower terminal surface of pressure sensor (4); the hydraulic lifting device is characterized by further comprising a clamping mechanism, rotating supporting blocks (6), swinging rods (7) and a pull rod (8), wherein the clamping mechanism is used for clamping a hydraulic cylinder, the two rotating supporting blocks (6) are respectively installed on the front side and the rear side of the sliding table (2) through shaft rods in a rotating mode, a certain gap is formed between the inner sides of the upper end faces of the two rotating supporting blocks (6) and the lower end faces of upper beams of the machine frame (1), the upper ends of the two swinging rods (7) are respectively fixedly connected with the shaft rods of the two rotating supporting blocks (6), the lower ends of the two swinging rods (7) are connected through pin shafts in a rotating mode, the lower ends of the pull rod (8) are connected with piston rods of the hydraulic pushing cylinder (3), long sliding grooves are formed in the upper portions of the pull rod (8), the piston rods of the hydraulic pushing cylinder (3) extend to pull the two swinging rods (7) to rotate through the pull rod (8), and the two swinging rods (6) are rotatably supported on the upper beams of the machine frame (1).

2. The hydraulic cylinder testing device according to claim 1, further comprising two torsion springs (9), wherein the two torsion springs (9) are respectively connected with the shaft rods of the two rotation support blocks (6) and two sides of the sliding table (2), and the elastic force of the two torsion springs (9) elastically rotates the two rotation support blocks (6) towards the outer side of the sliding table (2).

3. The hydraulic cylinder testing device according to claim 1, wherein the driving mechanism comprises a sliding rail (22), a ball screw (23) and a driving motor (24), the sliding rail (22) is installed on the lower end face of the upper beam of the frame (1), the sliding table (2) is slidably installed on the sliding rail (22), the ball screw (23) is rotatably installed below the upper beam of the frame (1), the ball screw (23) is rotatably connected with the sliding table (2) through a screw nut, the driving motor (24) is installed on the frame (1), and the driving motor (24) is in transmission connection with the ball screw (23).

4. The test device of the hydraulic cylinder according to claim 1, wherein the clamping mechanism comprises a lower supporting block (10), an upper pressing block (11), an elastic pull rod (12) and an elastic hanging rod (13), the lower supporting block (10) is arranged on a bottom plate of the frame (1), the upper pressing block (11) is covered and buckled on the lower supporting block (10), opposite V-shaped grooves are formed in the middle of the opposite surfaces of the lower supporting block (10) and the upper pressing block (11), the V-shaped grooves are used for clamping the fixed end of the tested hydraulic cylinder, the lower end of the elastic pull rod (12) is rotatably connected with the side wall of the lower supporting block (10), the upper end of the elastic pull rod (12) is rotatably connected with the side wall of the upper pressing block (11), the lower end of the elastic hanging rod (13) is rotatably connected with the other side wall of the lower supporting block (10), and the upper end of the elastic hanging rod (13) is detachably clamped with the other side wall of the upper pressing block (11).

5. The hydraulic cylinder testing device according to claim 4, further comprising a plurality of gaskets (21), wherein the plurality of gaskets (21) are respectively arranged on the inner walls of the V-shaped grooves of the lower support block (10) and the upper press block (11).

6. The test device for the hydraulic cylinder according to claim 4, further comprising a driving plate (14), a pulley I (15), a thrust plate (16), a pulley II (17), a pull rope (18) and an auxiliary push rod (19), wherein the driving plate (14) is slidably mounted at the lower part of the lower supporting block (10), the lower ends of the elastic pull rod (12) and the elastic hanging rod (13) are respectively rotatably connected with two sides of the driving plate (14), the pulley I (15) is mounted on the bottom plate of the frame (1) below the driving plate (14), the thrust plate (16) is slidably mounted on the bottom plate of the frame (1) in a lifting manner, the pulley II (17) is arranged on the lower end surface of the thrust plate (16), the pulley II (17) is lower than the driving plate (14), one end of the pull rope (18) is connected with an upper beam column of the frame (1), the other end of the pull rope (18) is connected with the bottom of the driving plate (14), the middle part of the pull rope (18) bypasses the pulley II (17) and the pulley I (15), the auxiliary push rod (19) is mounted on the bottom plate of the frame (1) below the thrust plate (16), and the lower end of the thrust plate (16) is located above the piston rod (16).

7. The hydraulic cylinder testing device according to claim 6, further comprising a plurality of guide rods (20), wherein upper ends of the guide rods (20) are connected with the thrust plate (16), lower portions of the guide rods (20) are slidably mounted in sliding sleeves of the bottom plate of the frame (1), and the guide rods (20) guide the thrust plate (16).