A device for testing the compressive strength of hydraulic landing gear cylinders

Abstract

This invention relates to the field of aviation hydraulic equipment testing and structural strength testing technology, specifically a cylinder compressive strength testing device for hydraulic landing gear. The device includes a frame with a mounting slot fixed on it for positioning and installing the cylinder. A movable frame is positioned above the mounting slot and is connected to and driven by a first driving device for lifting and lowering. A force-applying slider is positioned below the movable frame, and a piston die that can be movably engaged inside the cylinder is fixed on the force-applying slider. A first guide rod is fixed on the force-applying slider and passes through the movable frame. A first spring connects the movable frame and the force-applying slider. Multiple extrusion plates are arranged at equal angles along the circumference of the force-applying slider. This invention integrates axial pressure, internal radial expansion force, and external radial extrusion force into one device, achieving simultaneous and linked multi-load loading testing, thereby accurately verifying the comprehensive compressive strength and structural safety of the cylinder.

Description

Technical Field

[0001] This invention relates to the field of aviation hydraulic equipment testing and structural strength testing technology, specifically a device for testing the cylinder compressive strength of hydraulic landing gear. Background Technology

[0002] Hydraulic landing gear is a core load-bearing and cushioning component during aircraft takeoff, landing, and ground operation. Its reliability is directly related to flight safety. As a key component of the landing gear actuator cylinder, the cylinder must withstand huge vertical impact loads at the moment of landing. At the same time, when the aircraft is taxiing, braking, turning, or affected by crosswinds, it will also generate significant radial force, bending moment, and even torsional loads due to inertia and complex ground reaction forces. These loads usually act on the cylinder simultaneously in a compound form, putting it in a complex stress state. Therefore, accurate testing of the cylinder's compressive strength, especially its structural stability and load-bearing limit under compound loads, is a key link to ensure the safe service of the landing gear.

[0003] Currently, the testing methods in the industry mainly have the following limitations: First, most traditional testing devices adopt a single axial loading method, which can only simulate vertical pressure and cannot reproduce the real stress state of the coupling of axial and radial forces in actual working conditions. For example, at the moment of landing, the cylinder not only bears axial impact, but also is simultaneously subjected to radial component force, bending moment and even torsional load generated by fuselage inertia and ground reaction force. Traditional testing methods cannot reproduce this multi-directional coupled stress state, resulting in deviation between the test results and the actual failure mode, and making it difficult to effectively expose the potential defects of the cylinder under combined stress. Second, in order to achieve multi-directional loading, some advanced equipment uses multiple independent hydraulic or electric drive systems to control axial and radial loading separately, resulting in complex system structure, high manufacturing cost, high requirements for control synchronization and low testing efficiency. Therefore, we provide a hydraulic landing gear cylinder compressive strength testing device to solve the above-mentioned problems. Summary of the Invention

[0004] The purpose of this invention is to provide a cylinder compressive strength testing device for hydraulic landing gear, which integrates axial pressure, internal radial expansion force and external radial extrusion force into one device, and can realize dedicated testing of multiple loads synchronously and in linkage, so as to more realistically verify the comprehensive compressive strength and structural safety of the cylinder, thereby solving the problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention provides the following technical solution:

[0006] A hydraulic landing gear cylinder compressive strength testing device includes a frame, on which a mounting slot for positioning and installing the cylinder is fixed, and a movable frame is provided above the mounting slot. The movable frame is connected to a first driving device and is driven to lift and lower by the device.

[0007] A force-applying slider is provided below the movable frame. A piston die head that can be movably engaged inside the cylinder is fixed on the force-applying slider. A first guide rod that passes through the movable frame is fixed on the force-applying slider. A first spring connects the movable frame and the force-applying slider.

[0008] The force-applying slider is provided with multiple extrusion plates that are equally distributed along its circumference. When the force-applying slider moves upward relative to the movable frame, it can drive the multiple extrusion plates to expand radially in sync to apply radial force to the inner wall of the cylinder.

[0009] The mounting slot is provided with multiple force-applying clamps on its periphery. When the movable frame descends to the first set height and continues to descend, it can drive the multiple force-applying clamps to synchronously retract radially to apply radial force to the outer wall of the cylinder.

[0010] A hydraulic landing gear cylinder compressive strength testing device as described above: the first driving device includes a hydraulic cylinder fixed on the frame, the output end of the hydraulic cylinder is provided with a piston rod, and the movable frame is fixed on the piston rod.

[0011] As described above, a hydraulic landing gear cylinder compressive strength testing device is provided: the cylinder is filled with hydraulic oil, and when the movable frame drives the force-applying slider to move downward, it drives the piston die head to move downward in the cylinder and squeeze the hydraulic oil. The reaction force generated after the hydraulic oil is squeezed will push the piston die head and the force-applying slider fixed thereto to move upward relative to the movable frame.

[0012] As described above, a hydraulic landing gear cylinder compressive strength testing device is provided: a transmission plate is rotatably mounted on the inner side of the force-applying slider, a connecting sleeve is fixed on the transmission plate, a transmission shaft is fixed at the bottom of the movable frame, the transmission shaft is movably inserted into the connecting sleeve and is connected to the connecting sleeve through a roller groove structure, the transmission shaft will drive the connecting sleeve to rotate when it moves in the connecting sleeve, the transmission plate has multiple circumferentially distributed inclined grooves at equal angles, a transmission pin is movably engaged in the inclined grooves, the force-applying slider has multiple first radial grooves at equal angles, one end of the extrusion plate is movably engaged in the first radial groove, and the other end is fixed to the transmission pin.

[0013] The cylinder compressive strength testing device for a hydraulic landing gear as described above: the groove structure includes an arc-shaped groove formed on the drive shaft and balls embedded and engaged in the inner wall of the connecting sleeve. The balls are movably engaged in the arc-shaped groove and can roll along the track where the arc-shaped groove is located.

[0014] A hydraulic landing gear cylinder compressive strength testing device as described above: a mounting frame is fixed around the movable frame, multiple driving pressure plates are fixed at the bottom of the mounting frame, multiple guide seats are fixed around the mounting slot, a vertical slide groove and a second radial slide groove are provided in the guide seats, a force-applying clamp is movably engaged in the second radial slide groove, a driving pressure plate is movably engaged in the vertical slide groove, one end of the force-applying clamp and one end of the driving pressure plate are both inclined surfaces, the ends of the force-applying clamp and the driving pressure plate are fitted together through the inclined surfaces, and an elastic limiting component for resetting the force-applying clamp is provided on the guide seat.

[0015] The hydraulic landing gear cylinder compressive strength testing device described above: the elastic limiting component includes limiting blocks fixed on both sides of the force-applying clamp, and a second spring is fixedly connected between the limiting blocks and the guide seat.

[0016] As described above, a hydraulic landing gear cylinder compressive strength testing device is provided: a first pressure sensor is embedded in one side of the extrusion plate facing the inner wall of the cylinder and the other side of the force-applying clamping plate facing the outer wall of the cylinder, and is connected to an external control system for real-time monitoring and feedback of the pressure on the inner and outer walls of the cylinder.

[0017] The hydraulic landing gear cylinder compressive strength testing device described above: the piston die head is provided with a hydraulic oil circuit connecting to the inside of the cylinder, a second pressure sensor and a temperature sensor are installed on the oil circuit and connected to an external control system for real-time monitoring and feedback of the pressure and temperature status of the hydraulic oil inside the cylinder.

[0018] Compared with the prior art, the beneficial effects of the present invention are as follows: The present invention integrates the simultaneous application of three loads—axial compression, internal radial expansion, and external radial constraint—by driving the movable frame downward through a hydraulic cylinder. The axial pressure directly simulates the landing impact through the piston die head; the internal radial expansion force simulates the local compression of the cylinder wall by abnormal piston rod sway through the extrusion plate; and the external radial constraint force simulates the radial component force generated by aircraft braking inertia, structural constraints, or external collisions through the force-applying clamp. This composite loading method of internal and external pressure is the first to reproduce the most severe and complex stress state of the aircraft landing gear cylinder in actual operation with high precision on a single device, making the strength test and failure mode determination more realistic and reliable.

[0019] Furthermore, unlike complex solutions employing multiple independent drive systems, this invention uses a hydraulic cylinder to drive the movable frame in a single axial downward motion, simultaneously triggering two independent mechanical response paths: the first path utilizes the reaction force of the hydraulic oil within the cylinder to push the internal force-applying slider upward relative to the movable frame, thereby driving the extrusion plate to expand radially through internal linkage mechanisms such as the roller groove; the second path involves the movable frame descending to a set height, after which its peripheral drive pressure plate directly acts on the force-applying clamping plate, driving it to contract radially. This design, combining a single drive source with mechanical linkage, significantly simplifies the system structure, reduces manufacturing costs and maintenance difficulty, and avoids the complex synchronous control required by multiple independent electro-hydraulic servo systems, as well as the resulting delays, errors, and high costs. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the overall structure of an embodiment of a hydraulic landing gear cylinder compressive strength testing device.

[0021] Figure 2 This is a schematic diagram of the overall structure of a hydraulic landing gear cylinder compressive strength testing device.

[0022] Figure 3 for Figure 2 A schematic diagram of the decomposed part of the structure.

[0023] Figure 4 for Figure 3 A schematic diagram of the decomposed part of the structure.

[0024] Figure 5 for Figure 4 A schematic diagram of the decomposed part of the structure.

[0025] Figure 6 for Figure 5 A schematic diagram of the decomposed part of the structure.

[0026] Figure 7 for Figure 6 A schematic diagram of the decomposed part of the structure.

[0027] Figure 8 for Figure 3 A schematic diagram of the decomposed part of the structure.

[0028] Figure 9 This is a cross-sectional schematic diagram of the guide seat of a hydraulic landing gear cylinder compressive strength testing device.

[0029] Figure 10 for Figure 8 A partial structural diagram.

[0030] In the diagram: 1. Frame; 2. Cylinder; 3. Mounting slot; 4. Movable frame; 5. Hydraulic cylinder; 6. Piston rod; 7. Force-applying slider; 8. Piston die head; 9. First spring; 10. First guide rod; 11. Second guide rod; 12. Extrusion plate; 13. Transmission plate; 14. Connecting sleeve; 15. Inclined groove; 16. Transmission pin; 17. First radial groove; 18. Arc groove; 19. Ball bearing; 20. Guide seat; 21. Force-applying clamp; 22. Mounting frame; 23. Drive pressure plate; 24. Vertical groove; 25. Second radial groove; 26. Limiting block; 27. Second spring; 28. Transmission shaft. Detailed Implementation

[0031] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0032] Please see Figures 1-10 As an embodiment of the present invention, a cylinder compressive strength testing device for a hydraulic landing gear includes a frame 1, a mounting slot 3 for positioning and installing a cylinder 2 is fixed on the frame 1, a movable frame 4 is provided above the mounting slot 3, and the movable frame 4 is connected to a first driving device and driven to rise and fall by the device.

[0033] A force-applying slider 7 is provided below the movable frame 4. A piston mold head 8 that can be movably engaged inside the cylinder 2 is fixed on the force-applying slider 7. A first guide rod 10 that passes through the movable frame 4 is fixed on the force-applying slider 7. A first spring 9 is connected between the movable frame 4 and the force-applying slider 7.

[0034] The force-applying slider 7 is provided with multiple extrusion plates 12 distributed at equal angles along its circumference. When the force-applying slider 7 moves upward relative to the movable frame 4, it can drive the multiple extrusion plates 12 to expand radially in sync to apply radial force to the inner wall of the cylinder 2.

[0035] Multiple force-applying clamps 21 are provided around the mounting base 3. When the movable frame 4 descends to the first set height and continues to descend, it can drive the multiple force-applying clamps 21 to retract radially in sync to apply radial force to the outer wall of the cylinder 2.

[0036] In this embodiment, during use, the cylinder 2 to be tested is first installed and fixed on the mounting slot 3. Hydraulic oil is pumped into the cylinder 2, and the piston mold 8 is movable and engaged inside it. The first drive device is activated, driving the movable frame 4 to move downward. The movable frame 4, through the force-applying slider 7 below it, drives the piston mold 8 to move downward inside the cylinder 2, thereby applying axial pressure to the cylinder 2 to simulate landing impact load. During the downward movement of the piston mold 8, the cylinder 2 is filled with hydraulic oil, and the compression it receives will generate an upward reaction force. This reaction force pushes the piston mold 8 and the force-applying slider 7 fixed thereto to move upward relative to the continuously descending movable frame 4. This relative movement of the force-applying slider 7... Moving upwards causes multiple compression plates 12 mounted on it to expand radially in sync, thereby applying a radial expansion force to the inner wall of the cylinder 2. At the same time, as the movable frame 4 continues to descend to the first set height, its own structure begins to interact with multiple force-applying clamps 21 set around the mounting slot 3, driving all force-applying clamps 21 to contract radially in sync, thereby applying a radial constraint force to the outer wall of the cylinder 2. Through the above process, this device achieves the simultaneous application of a composite load of axial compression, internal radial expansion and external radial constraint to the cylinder 2 by controlling the movable frame 4 to descend using only a single drive source, efficiently and realistically simulating its stress state under complex working conditions.

[0037] As a further embodiment of the present invention, the first driving device includes a hydraulic cylinder 5 fixed on the frame 1, and a piston rod 6 is provided at the output end of the hydraulic cylinder 5, with the movable frame 4 fixed on the piston rod 6.

[0038] In this embodiment, the hydraulic cylinder 5 serves as a power source, and the piston rod 6 at its output end performs precise linear extension and retraction movements, thereby directly driving the movable frame 4 to perform stable lifting and lowering, providing a controllable and powerful active axial driving force for the entire testing process. In addition, a second guide rod 11 is fixed on the movable frame 4, which penetrates the frame 1. The second guide rod 11 can guide the movable frame 4 during lifting and lowering to prevent its position from shifting.

[0039] As a further embodiment of the present invention, the cylinder 2 is filled with hydraulic oil. When the movable frame 4 drives the force-applying slider 7 to move downward, it will drive the piston die 8 to move downward in the cylinder 2 and squeeze the hydraulic oil. The reaction force generated after the hydraulic oil is squeezed will push the piston die 8 and the force-applying slider 7 fixed thereto to move upward relative to the movable frame 4.

[0040] In this embodiment, the hydraulic oil in the cylinder 2 not only serves as the compressed medium, but its reaction force also acts as a switch to trigger the internal radial loading. When the piston die 8 is pressed down, the oil pressure increases, and this pressure is directly and automatically converted into a force that pushes the force-applying slider 7 to move upward, thus realizing the automatic and time-free conversion from axial loading to the trigger condition of internal radial loading.

[0041] As a further embodiment of the present invention, a transmission plate 13 is rotatably mounted on the inner side of the force-applying slider 7, a connecting sleeve 14 is fixed on the transmission plate 13, a transmission shaft 28 is fixed at the bottom of the movable frame 4, the transmission shaft 28 is movably inserted into the connecting sleeve 14 and is connected to the connecting sleeve 14 through a roller groove structure, the transmission shaft 28 will drive the connecting sleeve 14 to rotate when it moves in the connecting sleeve 14, a plurality of circumferentially distributed inclined grooves 15 are provided on the transmission plate 13, a transmission pin 16 is movably engaged in the inclined grooves 15, a plurality of circumferentially distributed first radial grooves 17 are provided on the force-applying slider 7, one end of the extrusion plate 12 is movably engaged in the first radial groove 17, and the other end is fixed to the transmission pin 16.

[0042] In this embodiment, when the force-applying slider 7 moves upward relative to the movable frame 4, the transmission shaft 28 fixed to the movable frame 4 moves relative to the connecting sleeve 14. Through the grooving structure between them, this linear relative motion is converted into the rotational motion of the connecting sleeve 14 and the transmission plate 13 fixed thereto. When the transmission plate 13 rotates, the inclined groove 15 on it drives the transmission pin 16 to move. Since the transmission pin 16 is fixed to the extrusion plate 12, the rotational motion of the transmission plate 13 is converted again into the linear radial expansion motion of the extrusion plate 12 along the first radial groove 17.

[0043] As a further embodiment of the present invention, the groove structure includes an arcuate groove 18 formed on the drive shaft 28 and a ball bearing 19 embedded and engaged in the inner wall of the connecting sleeve 14. The ball bearing 19 is movably engaged in the arcuate groove 18 and can roll along the track where the arcuate groove 18 is located.

[0044] In this embodiment, the engagement of the arc groove 18 and the ball 19 forms a motion conversion pair. When the drive shaft 28 and the connecting sleeve 14 move axially relative to each other, the ball 19 is constrained to roll within the arc groove 18, forcing the two to rotate relative to each other in the circumferential direction. The drive shaft 28 is fixed on the movable frame 4, so the connecting sleeve 14 rotates, thereby converting the axial displacement of the drive shaft 28 into the rotational motion of the connecting sleeve 14. The transmission is smooth and reliable. At the same time, the axial component force applied by the arc groove 18 to the ball 19 is transmitted to the force-applying slider 7, which can ensure the downward movement of the force-applying slider 7.

[0045] As a further embodiment of the present invention, a mounting frame 22 is fixed around the movable frame 4, and a plurality of driving pressure plates 23 are fixed at the bottom of the mounting frame 22. A plurality of guide seats 20 are fixed around the mounting slot 3. A vertical sliding groove 24 and a second radial sliding groove 25 are provided in the guide seat 20. A force-applying clamp 21 is movably engaged inside the second radial sliding groove 25, and a driving pressure plate 23 is movably engaged inside the vertical sliding groove 24. One end of the force-applying clamp 21 and one end of the driving pressure plate 23 are both inclined surfaces. The ends of the force-applying clamp 21 and the driving pressure plate 23 are attached to each other through the inclined surfaces. An elastic limiting component for resetting the force-applying clamp 21 is provided on the guide seat 20.

[0046] In this embodiment, when the movable frame 4 descends to the point where the driving pressure plate 23 contacts the inclined end of the force-applying clamp 21, the driving pressure plate 23, which continues to descend, decomposes the vertically downward force along its inclined surface, generating a component force that pushes the force-applying clamp 21 to move horizontally towards the center along the second radial slide 25, thereby realizing the radial contraction movement of the force-applying clamp 21. The vertical slide 24 guides the driving pressure plate 23 to ensure accurate contact, and the surface dimensions of the other end face of the force-applying clamp 21 are adapted to the outer dimensions of the cylinder 2 so that the force-applying clamp 21 can fit against the surface of the cylinder 2 and stably apply pressure to the surface of the cylinder 2.

[0047] As a further embodiment of the present invention, the elastic limiting component includes limiting blocks 26 fixed on both sides of the force-applying clamp 21, and a second spring 27 is fixedly connected between the limiting blocks 26 and the guide seat 20.

[0048] In this embodiment, when the test is over, the movable frame 4 rises, and after the driving pressure plate 23 disengages from the force-applying clamp 21, the second spring 27, which is in a stretched state, releases its elastic force and pulls the limiting block 26, thereby driving the force-applying clamp 21 to move along the second radial slide 25 and return to its initial position for use in the next test.

[0049] As a further embodiment of the present invention, a first pressure sensor is embedded in one side of the extrusion plate 12 facing the inner wall of the cylinder 2 and the other side of the force-applying clamping plate 21 facing the outer wall of the cylinder 2, and is connected to an external control system for real-time monitoring and feedback of the pressure on the inner and outer walls of the cylinder 2.

[0050] In this embodiment, the first pressure sensor can directly measure the actual radial force applied to the inner and outer walls of the cylinder 2 during the test. This data is fed back to the control system in real time, which can be used to accurately control the test process and serve as a key basis for evaluating the mechanical properties of the cylinder under combined radial force, thereby achieving quantitative detection.

[0051] As a further aspect of the present invention, the piston die head 8 is provided with a hydraulic oil circuit that connects to the inside of the cylinder 2. A second pressure sensor and a temperature sensor are installed on the oil circuit and connected to an external control system for real-time monitoring and feedback of the pressure and temperature status of the hydraulic oil inside the cylinder 2.

[0052] In this embodiment, the second pressure sensor is used to monitor the oil pressure inside the cylinder 2 in real time. This pressure is the root cause of the internal radial expansion and a key parameter for evaluating the cylinder 2's ability to withstand internal pressure. The temperature sensor is used to monitor the oil temperature changes that may occur due to compression and friction during the test, providing data for evaluating the intensity of the test and the thermal stability of the system. These data, combined with the data from the first pressure sensor, can provide a comprehensive information loop for comprehensively evaluating cylinder performance and the safety of the test system.

[0053] The working principle of this invention is as follows: First, the cylinder 2 is installed in the mounting slot 3 and hydraulic oil is injected. The piston die head 8 is placed inside. The hydraulic cylinder 5 is activated, driving the movable frame 4 downward. The movable frame 4, through the force-applying slider 7, drives the piston die head 8 to apply axial pressure to the cylinder 2. The piston die head 8 presses down to squeeze the hydraulic oil, and the resulting oil pressure pushes the force-applying slider 7 upward relative to the movable frame 4. This relative motion is converted into the rotation of the transmission plate 13 through the grooving structure between the transmission shaft 28 and the connecting sleeve 14. Then, through the inclined groove 15 and the transmission pin 16, the rotation is converted into the synchronous radial expansion of multiple extrusion plates 12, applying force to the inner wall of the cylinder 2. At the same time, the movable frame 4... After descending to the first set height, the drive pressure plate 23 on it contacts the inclined surface of the force-applying clamping plate 21, converting the vertical motion into the synchronous radial contraction of multiple force-applying clamping plates 21, applying force to the outer wall of the cylinder 2. Throughout the process, the first pressure sensor, the second pressure sensor, and the temperature sensor installed at key positions monitor the internal and external radial forces, internal oil pressure, and oil temperature in real time, and feed the data back to the control system, realizing precise control and safety monitoring of the entire composite loading process. Finally, through the downward movement of a single drive source, the composite load of axial compression, internal radial expansion, and external radial constraint of the cylinder 2 is automatically and synchronously applied and tested.

[0054] The above embodiments are exemplary and not restrictive. Therefore, any technical solutions that can be implemented in other specific forms without departing from the spirit or basic characteristics of the present invention are included within the scope of the present invention.

Claims

1. A device for testing the compressive strength of a cylinder of a hydraulic landing gear, comprising a frame (1), characterized in that, The frame (1) is fixed with a mounting slot (3) for positioning and installing the cylinder (2). A movable frame (4) is provided above the mounting slot (3). The movable frame (4) is connected to the first drive device and is driven to lift and lower. A force-applying slider (7) is provided below the movable frame (4). A piston mold head (8) that can be movably engaged inside the cylinder (2) is fixed on the force-applying slider (7). A first guide rod (10) that passes through the movable frame (4) is fixed on the force-applying slider (7). A first spring (9) is connected between the movable frame (4) and the force-applying slider (7). The force-applying slider (7) is provided with multiple extrusion plates (12) distributed at equal angles along its circumference. When the force-applying slider (7) moves upward relative to the movable frame (4), it can drive the multiple extrusion plates (12) to expand radially in sync to apply radial force to the inner wall of the cylinder (2). The mounting slot (3) is provided with multiple force-applying clamps (21) on its periphery. When the movable frame (4) descends to the set height and continues to descend, it can drive the multiple force-applying clamps (21) to retract radially in sync to apply radial force to the outer wall of the cylinder (2). The inner side of the force-applying slider (7) is rotatably mounted with a transmission plate (13), and a connecting sleeve (14) is fixed on the transmission plate (13). The bottom of the movable frame (4) is fixed with a transmission shaft (28). The transmission shaft (28) is movably inserted into the connecting sleeve (14) and is connected to the connecting sleeve (14) through a grooving structure. When the transmission shaft (28) moves in the connecting sleeve (14), it will drive the connecting sleeve (14) to rotate. The transmission plate (13) has multiple circumferentially distributed inclined grooves (15) at equal angles. A transmission pin (16) is movably engaged in the inclined grooves (15). The force-applying slider (7) has multiple circumferentially distributed first radial grooves (17). One end of the extrusion plate (12) is movably engaged in the first radial groove (17), and the other end is fixed to the transmission pin (16). The movable frame (4) is fixed with a mounting frame (22) on its periphery. Multiple driving pressure plates (23) are fixed at the bottom of the mounting frame (22). Multiple guide seats (20) are fixed on the periphery of the mounting slot (3). A vertical sliding groove (24) and a second radial sliding groove (25) are provided in the guide seat (20). The force-applying clamp (21) is movably engaged in the second radial sliding groove (25). The driving pressure plate (23) is movably engaged in the vertical sliding groove (24). One end of the force-applying clamp (21) and one end of the driving pressure plate (23) are both inclined surfaces. The ends of the force-applying clamp (21) and the driving pressure plate (23) are attached to each other through the inclined surfaces. An elastic limiting component for resetting the force-applying clamp (21) is provided on the guide seat (20).

2. The hydraulic landing gear cylinder compressive strength testing device according to claim 1, characterized in that, The first driving device includes a hydraulic cylinder (5) fixed on the frame (1), and a piston rod (6) is provided at the output end of the hydraulic cylinder (5). The movable frame (4) is fixed on the piston rod (6).

3. The hydraulic landing gear cylinder compressive strength testing device according to claim 1, characterized in that, The cylinder (2) is filled with hydraulic oil. When the movable frame (4) drives the force-applying slider (7) to move downward, it will drive the piston die (8) to move downward in the cylinder (2) and squeeze the hydraulic oil. The reaction force generated after the hydraulic oil is squeezed will push the piston die (8) and the force-applying slider (7) fixed thereto to move upward relative to the movable frame (4).

4. The hydraulic landing gear cylinder compressive strength testing device according to claim 1, characterized in that, The groove structure includes an arc-shaped groove (18) opened on the drive shaft (28) and a ball (19) embedded and engaged in the inner wall of the connecting sleeve (14). The ball (19) is movably engaged in the arc-shaped groove (18) and can roll along the track where the arc-shaped groove (18) is located.

5. The hydraulic landing gear cylinder compressive strength testing device according to claim 1, characterized in that, The elastic limiting component includes limiting blocks (26) fixed on both sides of the force-applying clamp (21), and a second spring (27) is fixedly connected between the limiting blocks (26) and the guide seat (20).

6. The hydraulic landing gear cylinder compressive strength testing device according to claim 1, characterized in that, The first pressure sensor is embedded in one side of the extrusion plate (12) facing the inner wall of the cylinder (2) and the other side of the force-applying clamp (21) facing the outer wall of the cylinder (2), and is connected to the external control system for real-time monitoring and feedback of the pressure on the inner and outer walls of the cylinder (2).

7. The hydraulic landing gear cylinder compressive strength testing device according to claim 1, characterized in that, The piston die (8) is provided with a hydraulic oil circuit that connects to the inside of the cylinder (2). A second pressure sensor and a temperature sensor are installed on the oil circuit and connected to an external control system to monitor and provide feedback on the pressure and temperature of the hydraulic oil inside the cylinder (2) in real time.

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