Fatigue resistance testing device for hydraulic parts

Abstract

The invention provides a fatigue resistance testing device for hydraulic parts, and relates to the technical field of hydraulic part testing. A hydraulic pump set is installed on the fixing frame, a pressure gauge is installed on an oil conveying pipeline in the hydraulic pump set, a partition plate is installed at the upper end of the fixing frame, an installation plate is installed on the partition plate, a rail plate is installed on the installation plate through bolts, and a sliding plate capable of sliding front and back is installed on the rail plate. In the aspect of flow, the connecting seat can be flexibly adjusted, can be in rapid sealing butt joint with an oil cylinder, is matched with a hydraulic pump set to stably apply pressure, simulate real working conditions, feed back data in real time by a pressure gauge, form a closed-loop test system, improve test efficiency and result reliability, and improve performance practicability; the third hydraulic rod linkage component adaptively clamps the left end of the oil cylinder, the first hydraulic rod drives the clamping plate to fix the middle of the oil cylinder, stress is dispersed, damage is avoided, potential displacement hazards are eliminated, and testing stability is guaranteed.

Description

Technical Field

[0001] This invention relates to the field of hydraulic component testing technology, and in particular to a device for testing the fatigue strength of hydraulic components. Background Technology

[0002] In modern industry, hydraulic systems are widely used in many sectors such as engineering machinery, aerospace, and automobile manufacturing. The performance of hydraulic components directly affects the stability and reliability of the entire system. Among these, fatigue strength is one of the key indicators for measuring the quality of hydraulic components. Through scientific and accurate fatigue strength testing, potential quality problems of components can be detected in advance, avoiding equipment failures and safety accidents caused by fatigue failure. Therefore, developing efficient and reliable fatigue strength testing devices for hydraulic components is crucial. This invention is a fatigue strength testing device for hydraulic components.

[0003] Patent CN220912621U discloses a testing device for fatigue durability testing of brake hoses, comprising a frame, a hydraulic master cylinder, and a cylinder. The device is characterized by: a cylinder housed within the frame; the cylinder's inlet connected to an air source assembly; the cylinder's extension shaft connected to one end of the hydraulic master cylinder; and the other end of the hydraulic master cylinder connected to a rigid pipe. The air source assembly includes a reversing solenoid valve, a speed control valve, an electro-proportional valve, and an air source. The air source is connected to one end of the electro-proportional valve via an air circuit; the other end of the electro-proportional valve is connected to one end of the speed control valve via an air circuit; the other end of the speed control valve is connected to one end of the reversing solenoid valve via an air circuit; and the other end of the reversing solenoid valve is connected to the air inlet of the cylinder via an air circuit. Compared with existing technologies, this device provides a testing device for fatigue durability testing of brake hoses, achieving millisecond-level precise control of the pressure curve, thereby enabling complex pulse tests such as ABS / ASR for the hoses.

[0004] However, the aforementioned patents use a single connection method, which cannot effectively fix and test hydraulic components of different shapes and structures, such as hydraulic cylinders. When faced with hydraulic components with complex shapes, the components are prone to loosening during the testing process, resulting in inaccurate test results. It is impossible to achieve the automated operation of flexible adjustment of component positions and oil circuit connection. Summary of the Invention

[0005] This invention relates to a fatigue strength testing device for hydraulic components, in order to solve the technical problems mentioned in the background art.

[0006] In a first aspect, the present invention provides a fatigue strength testing device for hydraulic components, specifically comprising: a fixed frame; a hydraulic pump assembly mounted on the fixed frame, a pressure gauge mounted on the oil supply line within the hydraulic pump assembly, a partition plate mounted on the upper end of the fixed frame, an mounting plate mounted on the partition plate, a rail plate mounted on the mounting plate by bolts, a sliding plate mounted on the rail plate that can slide back and forth, a connecting seat for docking with a hydraulic cylinder barrel provided above the sliding plate, the connecting seat being connected to the oil supply line of the hydraulic pump assembly, a mounting bracket mounted on the partition plate by bolts, two wall plates mounted on the lower end of the mounting bracket, a first hydraulic rod mounted on the lower end of the two wall plates, two clamping plates for clamping the hydraulic cylinder barrel mounted on the mounting bracket by pins, a connecting plate connected to the lower end of each clamping plate by pins, and a piston rod of the first hydraulic rod connected to the lower end of each connecting plate by pins.

[0007] In at least some embodiments, a second hydraulic rod is mounted on the mounting plate, the piston rod of the second hydraulic rod is connected to a sliding plate, a support is mounted on the sliding plate by bolts, a pulley is fixedly mounted on the support, a rotating plate is mounted on the support by bearings, and four rollers are mounted on the lower end of the rotating plate, the lower ends of the four rollers are in contact with the top surface of the sliding plate.

[0008] In at least some embodiments, a support is mounted on the rotating plate, a first motor is mounted on the support, a pulley is fixedly mounted on the output shaft of the first motor, and a connecting belt connects the pulley on the output shaft of the first motor to the pulley on the output shaft of the first motor.

[0009] In at least some embodiments, two lifting cylinders are fixed on the rotating plate, a top plate is installed on the upper end of the two lifting cylinders, a track frame is fixedly installed on the top plate, a movable seat that can move left and right is installed on the track frame, a first lead screw is installed on the track frame through a bearing, the first lead screw is threadedly engaged with the lower end of the movable seat, and a second motor is installed on the top plate, the output shaft of the second motor is connected to the first lead screw through a coupling.

[0010] In at least some embodiments, a base is bolted to the movable seat, a housing is bolted to the upper end of the base, and a self-locking motor is bolted to the lower end of the housing. A gear is fixed on the output shaft of the self-locking motor. Two sets of rails are fixedly mounted on the housing. Push seats slide on both sets of rails. The push seats are provided with a toothed structure. The toothed structures on both push seats mesh with the gears on the output shaft of the self-locking motor. Movable blocks that can move along the rails are mounted on both sets of rails. Springs are mounted on the front and rear sides of the movable blocks. Clamping claws are mounted on both movable blocks. The connecting seat is clamped between the two clamping claws.

[0011] In at least some embodiments, a bracket is bolted to the fixed frame, a movable plate that can slide left and right is mounted on the upper end of the bracket, and a second lead screw is mounted on the upper end of the bracket via a bearing. The second lead screw is threadedly engaged with the lower end of the movable plate. A motor base A is bolted to the upper end of the bracket, and a third motor is mounted on the motor base A. The output shaft of the third motor is connected to the second lead screw via a coupling.

[0012] In at least some embodiments, a first rail frame is mounted on the movable plate, a third lead screw is mounted inside the first rail frame via bearings, a motor base B is mounted at the rear end of the first rail frame, a fourth motor is mounted on the motor base B, the output shaft of the fourth motor is connected to the rear end of the third lead screw via a coupling, and a movable seat that can slide back and forth is mounted on the first rail frame, the movable seat being threadedly engaged with the third lead screw.

[0013] In at least some embodiments, a second rail frame is bolted to the movable seat, a fourth lead screw is mounted inside the second rail frame via bearings, a motor base C is mounted on the upper end of the second rail frame, a fifth motor is mounted on the motor base C, and the output shaft of the fifth motor is connected to the upper end of the fourth lead screw via a coupling.

[0014] In at least some embodiments, a lifting seat that can be raised and lowered is installed on the second rail frame, the lifting seat is threadedly engaged with the fourth lead screw, and a fixed seat is fixedly installed on the lifting seat.

[0015] In at least some embodiments, two fixed rods are fixed on the fixed base, and an actuating frame is installed between the two fixed rods via a pin. A movable sleeve is movably mounted on the actuating frame. A third hydraulic rod is installed on the fixed base, and the piston rod of the third hydraulic rod is connected to the movable sleeve via a pin. A locking cylinder is fixed on the fixed base, and the locking cylinder is provided with three oblong through slots. Clamping plates are hinged in each of the three oblong through slots. A movable cylinder is movably mounted on the locking cylinder, and the actuating frame is movably connected to the movable cylinder.

[0016] This invention provides a fatigue strength testing device for hydraulic components, which has the following advantages: In this invention, the flexible adjustment design of the connector, combined with the precise linkage of the hydraulic pump unit and the pressure gauge, constructs an efficient and scientific testing system in the connection and execution of the testing process. By precisely adjusting the position of the connector, a sealing connection with the right end of the cylinder can be quickly completed, ensuring stable oil circuit transmission. The hydraulic pump unit continuously and evenly applies pressure to the cylinder, highly replicating the stress state in actual working conditions. The pressure gauge provides real-time and accurate pressure data feedback, providing a visual and quantifiable analytical basis for fatigue strength testing. This closed-loop testing process not only significantly improves testing efficiency but also greatly enhances the scientificity and reliability of the test results through precise data collection and analysis.

[0017] Furthermore, this invention achieves significant breakthroughs in testing performance and practicality. The device employs a multi-point, differentiated clamping and fixing scheme, utilizing a third hydraulic rod to link the actuating frame, movable sleeve, and clamping plate to achieve adaptive clamping of the left end of the cylinder. Simultaneously, the clamping plate is driven by the first hydraulic rod to precisely clamp the middle of the cylinder. This combined fixing method can not only distribute the force according to the structural characteristics of the cylinder, preventing damage to components caused by local stress concentration, but also effectively eliminate the displacement risks caused by vibration and pressure fluctuations during testing through double stabilization, greatly improving testing stability.

[0018] The modular and adjustable design of each component in this invention gives it strong compatibility and adaptability. Whether it is a hydraulic cylinder of different specifications and sizes or other types of hydraulic components, it can be quickly adapted to the testing requirements by adjusting the sliding plate, moving seat, lifting seat and other components. This effectively expands the application range of the testing device, reduces the repeated investment costs of enterprises in testing equipment, and demonstrates extremely high practical value and economic benefits. Attached Figure Description

[0019] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings of the embodiments will be briefly described below.

[0020] The accompanying drawings described below are only related to some embodiments of the invention and are not intended to limit the invention.

[0021] In the attached diagram: Figure 1 A schematic diagram of the overall structure of the present invention is shown.

[0022] Figure 2 A schematic diagram of the mounting plate portion of the present invention is shown.

[0023] Figure 3 A schematic diagram of the rotating plate portion of the present invention is shown.

[0024] Figure 4 A schematic diagram of the top plate portion of the present invention is shown.

[0025] Figure 5 A schematic diagram of the base portion of the present invention is shown.

[0026] Figure 6 A schematic diagram of the connector of the present invention is shown.

[0027] Figure 7 A schematic diagram of the mounting bracket portion of the present invention is shown.

[0028] Figure 8 A schematic diagram of the support portion of the present invention is shown.

[0029] Figure 9 The present invention is shown Figure 8 A magnified structural diagram of part A in the middle.

[0030] Figure 10 The present invention is shown Figure 8 A magnified structural diagram of part B.

[0031] Figure 11 The present invention is shown Figure 8 A magnified structural diagram of section C.

[0032] Figure 12 A schematic diagram of the fixing base portion of the present invention is shown.

[0033] Figure 13 A schematic diagram of the locking cylinder portion of the present invention is shown.

[0034] List of reference numerals 1. Fixed frame; 11. Hydraulic pump set; 12. Partition plate; 13. Mounting plate; 131. Rail plate; 132. Sliding plate; 133. Second hydraulic rod; 14. Rotating plate; 141. Support; 1411. First motor; 142. Support roller; 143. Lifting cylinder; 15. Column; 151. Connecting belt; 16. Top plate; 161. Rail frame; 162. Moving seat; 163. First lead screw; 164. Second motor; 17. Base; 171. Housing; 1711. Self-locking motor; 1712. Rail rod; 1713. Push seat; 1714. Movable block; 1715. Clamping claw; 172. Connecting seat; 18. Mounting frame; 181. Wall panel; 1811, Clamping plate; 1812, Connecting plate; 182, First hydraulic rod; 2, Bracket; 21, Moving plate; 211, Second lead screw; 212, Motor base A; 213, Third motor; 22, First rail frame; 221, Third lead screw; 222, Motor base B; 223, Fourth motor; 23, Movable seat; 231, Second rail frame; 2311, Motor base C; 2312, Fifth motor; 2313, Fourth lead screw; 232, Lifting seat; 24, Fixed seat; 241, Fixed rod; 2411, Actuating frame; 2412, Movable sleeve; 2413, Third hydraulic rod; 242, Locking cylinder; 2421, Clamping plate; 2422, Movable cylinder. Detailed Implementation

[0035] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the described embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0036] Please refer to Figures 1 to 13 Example 1: This invention proposes a fatigue strength testing device for hydraulic components, comprising: a fixed frame 1; a hydraulic pump assembly 11 mounted on the fixed frame 1, a pressure gauge installed on the oil delivery pipeline within the hydraulic pump assembly 11, a partition 12 mounted on the upper end of the fixed frame 1, a mounting plate 13 mounted on the partition 12, a rail plate 131 mounted on the mounting plate 13 by bolts, a sliding plate 132 slidable back and forth mounted on the rail plate 131, and a connecting seat 172 for docking with a hydraulic cylinder barrel disposed above the sliding plate 132. 2. The oil supply pipe is connected to the hydraulic pump group 11. A mounting bracket 18 is installed on the partition plate 12 by bolts. Two wall plates 181 are installed at the lower end of the mounting bracket 18. A first hydraulic rod 182 is installed at the lower end of the two wall plates 181. Two clamping plates 1811 for clamping the hydraulic cylinder are installed on the mounting bracket 18 by pins. The lower end of each clamping plate 1811 is connected to a connecting plate 1812 by pins. The lower end of each connecting plate 1812 is connected to the piston rod of the first hydraulic rod 182 by pins.

[0037] In this invention, a second hydraulic rod 133 is mounted on the mounting plate 13. The piston rod of the second hydraulic rod 133 is connected to a sliding plate 132. A support column 15 is bolted onto the sliding plate 132. A pulley is fixedly mounted on the support column 15. A rotating plate 14 is mounted on the support column 15 via bearings. Four rollers 142 are mounted on the lower end of the rotating plate 14, and the lower ends of the four rollers 142 are in contact with the top surface of the sliding plate 132. A support 141 is mounted on the rotating plate 14. A first motor 1411 is mounted on the support 141. A pulley is fixedly mounted on the output shaft of the first motor 1411. The pulley on the output shaft of the first motor 1411 is connected to the output shaft of the first motor 1411. A connecting belt 151 connects the pulleys on the mounting plate 13. Its function is as follows: the second hydraulic rod 133 on the mounting plate 13 drives the sliding plate 132 to slide back and forth on the rail plate 131 through the piston rod, so as to realize the flexible adjustment of the position of the connecting seat 172. The support column 15 on the sliding plate 132 fixes the pulley and supports the rotating plate 14 through the bearing. The four support rollers 142 at the lower end of the rotating plate 14 contact the top surface of the sliding plate 132, providing stable support and a flexible rotation foundation for the rotating plate 14. The support 141 on the rotating plate 14 is equipped with the first motor 1411. The pulley on its output shaft is driven by the connecting belt 151 to drive the relevant components to rotate, so as to facilitate the docking of the connecting seat 172 with the test cylinder.

[0038] In this invention, two lifting cylinders 143 are fixed on the rotating plate 14. A top plate 16 is installed on the upper end of the two lifting cylinders 143. A track frame 161 is fixedly installed on the top plate 16. A movable seat 162 that can move left and right is installed on the track frame 161. A first lead screw 163 is installed on the track frame 161 through a bearing. The first lead screw 163 is threadedly engaged with the lower end of the movable seat 162. A second motor 164 is installed on the top plate 16. The output shaft of the second motor 164 is connected to the first lead screw 163 through a coupling. Its function is that the two lifting cylinders 143 on the rotating plate 14 drive the top plate 16 to move up and down through telescopic movements, which can flexibly adjust the vertical height of the test components on the top plate 16, thereby adapting to test components of different height specifications. The hydraulic cylinder enhances the compatibility of various hydraulic components. The track frame 161 on the top plate 16 works with the first lead screw 163 and the second motor 164. When the second motor 164 is working, it drives the first lead screw 163 to rotate through the coupling. The movable seat 162, which is threaded with the first lead screw 163, can move left and right on the track frame 161. It precisely controls the lateral position of components such as the connecting seat 172 installed on the movable seat 162, so that the connecting seat 172 can accurately dock with the test hydraulic cylinder, further improving the accuracy and efficiency of the test preparation process, ensuring stable oil circuit connection during the test, and working together with other components to achieve fatigue strength testing of hydraulic components from multiple angles and directions, thereby improving the reliability and effectiveness of the test results.

[0039] In this invention, a base 17 is bolted to the movable seat 162. A housing 171 is bolted to the upper end of the base 17, and a self-locking motor 1711 is bolted to the lower end of the housing 171. A gear is fixed on the output shaft of the self-locking motor 1711. Two sets of rails 1712 are fixedly mounted on the housing 171. Push seats 1713 slide on both sets of rails 1712. The push seats 1713 are provided with a toothed structure, and the toothed structures on both push seats 1713 mesh with the gear on the output shaft of the self-locking motor 1711. Movable blocks 1714 that can move along the rails 1712 are mounted on both sets of rails 1712, and springs are installed on the front and rear sides of the movable blocks 1714. Each movable block 1714 is equipped with a clamping claw 1715. The connecting seat 172 is clamped between two clamping claws 1715. Its function is to precisely drive the two push seats 1713 to slide along the rail 1712 when the self-locking motor 1711 starts, thereby driving the clamping claws 1715 installed on the movable block 1714 to clamp or release the connecting seat 172, realizing the rapid fixing and disassembly of the connecting seat 172, improving the efficiency of test preparation. At the same time, the springs installed on the front and rear sides of the movable block 1714 can provide buffering and adaptive adjustment functions, effectively avoiding damage to the connecting seat 172 due to rigid clamping during the clamping process, and ensuring the sealing and stability of the connection between the connecting seat 172 and the test cylinder.

[0040] In Example 2, based on Example 1, a bracket 2 is bolted onto the fixed frame 1. A movable plate 21 that can slide left and right is mounted on the upper end of the bracket 2. A second lead screw 211 is mounted on the upper end of the bracket 2 via a bearing. The second lead screw 211 is threaded into the lower end of the movable plate 21. A motor base A212 is bolted onto the upper end of the bracket 2. A third motor 213 is mounted on the motor base A212. The output shaft of the third motor 213 is connected to the second lead screw 211 via a coupling. A first rail frame 22 is mounted on the movable plate 21. The first track frame 22 has a third lead screw 221 mounted inside via bearings. A motor mount B222 is mounted at the rear end of the first track frame 22, and a fourth motor 223 is mounted on the motor mount B222. The output shaft of the fourth motor 223 is connected to the rear end of the third lead screw 221 via a coupling. A movable seat 23, which can slide back and forth, is mounted on the first track frame 22. The movable seat 23 is threadedly engaged with the third lead screw 221. A second track frame 231 is mounted on the movable seat 23 via bolts, and the fourth lead screw 231 is mounted inside the second track frame 231 via bearings. 3. A motor mount C2311 is installed on the upper end of the second rail frame 231. A fifth motor 2312 is installed on the motor mount C2311. The output shaft of the fifth motor 2312 is connected to the upper end of the fourth lead screw 2313 via a coupling. A lifting seat 232 that can be raised and lowered is installed on the second rail frame 231. The lifting seat 232 is threadedly engaged with the fourth lead screw 2313. A fixed seat 24 is fixedly installed on the lifting seat 232. Its function is: the third motor 213 drives the second lead screw 211 to rotate via the coupling, and the screw 2312 is threadedly engaged with the fourth lead screw 213. The movable plate 21 with threaded engagement can slide left and right on the upper end of the bracket 2, providing a lateral foundation for overall adjustment. Inside the first rail frame 22 on the movable plate 21, the fourth motor 223 drives the third lead screw 221 to rotate, so that the movable seat 23 with threaded engagement with the third lead screw 221 can slide back and forth along the first rail frame 22, further refining the longitudinal position adjustment. Inside the second rail frame 231 on the movable seat 23, the fifth motor 2312 drives the fourth lead screw 2313 to rotate, realizing the up and down lifting of the lifting seat 232, and completing the precise vertical positioning.

[0041] In Example 3, based on Examples 1 and 2, two fixing rods 241 are fixed on the fixing base 24. A lever frame 2411 is installed between the two fixing rods 241 via a pin. A movable sleeve 2412 is movably mounted on the lever frame 2411. A third hydraulic rod 2413 is installed on the fixing base 24. The piston rod of the third hydraulic rod 2413 is connected to the movable sleeve 2412 via a pin. A locking cylinder 242 is fixed on the fixing base 24. The locking cylinder 242 is provided with three oblong through slots. Each of the three oblong through slots is hinged with a clamping plate 2421. A movable cylinder 2422 is movably mounted on the locking cylinder 242. The lever frame 241... The third hydraulic rod 2413 drives the movable sleeve 2412 through the piston rod, which drives the actuating frame 2411 to rotate around the pin shaft. The actuating frame 2411 is movably connected to the movable cylinder 2422, thereby causing the movable cylinder 2422 to generate axial displacement on the locking cylinder 242. The three waist-shaped through slots on the locking cylinder 242 provide movement space for the clamping plate 2421. When the movable cylinder 2422 moves, it will push the clamping plate 2421 to rotate around the hinge point. The three clamping plates 2421 synchronously retract towards the center or open outward to realize the clamping or releasing action of the test components such as the left end of the oil cylinder.

[0042] The working principle of this invention is as follows: The self-locking motor 1711 is started, and through the meshing transmission of the gear and the toothed structure of the push seat 1713, the clamping jaw 1715 is driven to clamp the connecting seat 172, placing the cylinder to be tested in the designated position. The first hydraulic rod 182 drives the two clamping plates 1811 to clamp the middle of the cylinder. The third motor 213, fourth motor 223, and fifth motor 2312 on the bracket 2 respectively drive the second lead screw 211, third lead screw 221, and fourth lead screw 2313 to rotate, causing the moving plate 21, movable seat 23, and lifting seat 232 to work together, moving the fixed seat 24 to the appropriate position. Simultaneously, the third hydraulic rod 2413 extends and retracts, driving the actuating frame 2411 and movable sleeve 2412 to work together, causing the three clamping plates 2421 to adaptively clamp and fix the left end of the cylinder. Subsequently, the second hydraulic rod 133 pushes the sliding plate 132 to slide back and forth on the track plate 131, cooperating with the rotating plate 14. The belt drive system driven by the first electric motor 1411 adjusts the position of the connecting seat 172 to initially align it with the right end of the oil cylinder. At the same time, the second electric motor 164 on the top plate 16 drives the first lead screw 163 to rotate, causing the moving seat 162 to move left and right on the track frame 161 to further calibrate the lateral position of the connecting seat 172. Combined with the lifting cylinder 143's adjustment of the lifting of the top plate 16, the connecting seat 172 and the right end of the oil cylinder are precisely connected, ensuring stable oil circuit connection. During the test execution phase, the hydraulic pump group 11 starts working, continuously applying pressure to the oil cylinder to simulate the stress state in actual working conditions. The pressure gauge monitors the internal pressure data of the oil cylinder in real time and feeds it back to the operator. During the test, the driving components can be adjusted again as needed to conduct multi-angle and multi-directional tests on the oil cylinder, comprehensively evaluating the fatigue strength of the hydraulic components. Finally, based on the pressure gauge data and test duration and other parameters, it is determined whether the fatigue performance of the components meets the standards.

[0043] The following points should be noted in this article: 1. The accompanying drawings of the embodiments of the present invention only involve the structures involved in the embodiments of the present invention; other structures can refer to general designs.

[0044] 2. Where there is no conflict, the embodiments of the present invention and the features thereof can be combined with each other to obtain new embodiments.

[0045] The above are merely specific embodiments of the present invention, but the scope of protection of the present invention is not limited thereto. Any changes or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in the present invention should be included within the scope of protection of the present invention.

Claims

1. A hydraulic component fatigue strength testing apparatus comprising: The utility model provides a fixed frame, characterized by being provided with a hydraulic pump group on the fixed frame, a pressure gauge is arranged on the oil pipeline in the hydraulic pump group, a partition plate is arranged on the upper end of the fixed frame, a mounting plate is arranged on the partition plate, a rail plate is arranged on the mounting plate through bolts, a sliding plate capable of sliding forward and backward is arranged on the rail plate, a connecting seat is arranged on the upper side of the sliding plate and is connected with the hydraulic cylinder barrel, the connecting seat is connected with the oil pipeline of the hydraulic pump group, a mounting frame is arranged on the partition plate through bolts, two wall plates are arranged on the lower end of the mounting frame, a first hydraulic rod is arranged on the lower end of the two wall plates, two clamping plates for clamping the hydraulic cylinder barrel are arranged on the mounting frame through a pin shaft, a connecting plate is connected with the lower end of the two clamping plates through a pin shaft, and the lower end of the two connecting plates is connected with the piston rod of the first hydraulic rod through a pin shaft.

2. The hydraulic component fatigue strength testing device according to claim 1, wherein A second hydraulic rod is arranged on the mounting plate, the piston rod of the second hydraulic rod is connected with the sliding plate, a support column is arranged on the sliding plate through bolts, a belt pulley is fixedly arranged on the support column, a rotating plate is arranged on the support column through a bearing, four supporting wheels are arranged on the lower end of the rotating plate and are in contact with the top surface of the sliding plate.

3. The hydraulic component fatigue strength testing device according to claim 2, wherein A support base is arranged on the rotating plate, a first motor is arranged on the support base, a belt pulley is fixedly arranged on the output shaft of the first motor, and a connecting belt is connected between the belt pulley on the output shaft of the first motor and the belt pulley on the output shaft of the first motor.

4. The hydraulic component fatigue strength testing device according to claim 3, wherein Two lifting cylinders are fixedly arranged on the rotating plate, a top plate is arranged on the upper end of the two lifting cylinders, a rail frame is fixedly arranged on the top plate, a moving seat capable of moving left and right is arranged on the rail frame, a first lead screw is arranged on the rail frame through a bearing, the first lead screw is in threaded cooperation with the lower end of the moving seat, a second motor is arranged on the top plate, and the output shaft of the second motor is connected with the first lead screw through a shaft coupling.

5. The hydraulic component fatigue strength testing device according to claim 4, wherein A base is arranged on the moving seat through bolts, a shell seat is arranged on the upper end of the base through bolts, a self-locking motor is arranged on the lower end of the shell seat through bolts, a gear is fixedly arranged on the output shaft of the self-locking motor, two groups of rail rods are fixedly arranged on the shell seat, a pushing seat is slidably arranged on the two groups of rail rods, a tooth groove structure is arranged on the pushing seat, the tooth groove structures on the two pushing seats are in meshing connection with the gear on the output shaft of the self-locking motor, movable blocks capable of moving along the rail rods are arranged on the two groups of rail rods, springs are arranged on the front and back sides of the movable blocks, clamping claws are arranged on the two movable blocks, and the connecting seat is clamped between the two clamping claws.

6. The hydraulic component fatigue strength testing device according to claim 1, wherein A support frame is arranged on the fixed frame through bolts, a moving plate capable of moving left and right is arranged on the upper end of the support frame, a second lead screw is arranged on the upper end of the support frame through a bearing, the second lead screw is in threaded cooperation with the lower end of the moving plate, a motor seat A is arranged on the upper end of the support frame through bolts, a third motor is arranged on the motor seat A, and the output shaft of the third motor is connected with the second lead screw through a shaft coupling.

7. The hydraulic component fatigue strength testing device according to claim 6, wherein A first rail frame is arranged on the moving plate, a third lead screw is arranged in the first rail frame through a bearing, a motor seat B is arranged on the rear end of the first rail frame, a fourth motor is arranged on the motor seat B, the output shaft of the fourth motor is connected with the rear end of the third lead screw through a shaft coupling, a movable seat capable of sliding forward and backward is arranged on the first rail frame, and the movable seat is in threaded cooperation with the third lead screw.

8. The hydraulic component fatigue strength testing device according to claim 7, wherein The second rail frame is bolted on the movable seat, the fourth lead screw is installed in the second rail frame through a bearing, the motor seat C is installed on the upper end of the second rail frame, the fifth motor is installed on the motor seat C, and the output shaft of the fifth motor is connected with the upper end of the fourth lead screw through a shaft coupling.

9. The hydraulic component fatigue strength testing device of claim 8, wherein, A lifting seat capable of lifting up and down is installed on the second rail frame, the lifting seat is in screw thread cooperation with the fourth lead screw, and the fixed seat is fixedly installed on the lifting seat.

10. The hydraulic component fatigue strength testing device according to claim 9, wherein Two fixed rods are fixed on the fixed seat, a pushing frame is installed between the two fixed rods through a pin shaft, a movable sleeve is movably arranged on the pushing frame, a third hydraulic rod is installed on the fixed seat, the piston rod of the third hydraulic rod is connected with the movable sleeve through a pin shaft, a locking cylinder is fixed on the fixed seat, three waist-shaped through grooves are arranged on the locking cylinder, clamping plates are hinged in the three waist-shaped through grooves, a movable cylinder is movably arranged on the locking cylinder, and the pushing frame and the movable cylinder are movably connected.

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