Fatigue life test bed for hydraulic sealing element

Abstract

The invention relates to the technical field of sealing element detection, and discloses a hydraulic sealing element fatigue life test bed which comprises a test box. The hydraulic cylinder is driven by external force to be rotationally arranged in the test box; the movable plug is arranged in the hydraulic cylinder in a sliding mode, and a hydraulic sealing piece is detachably arranged on the outer side of the movable plug; one end of the push rod is fixedly arranged at the top of the movable plug, and the other end penetrates through the top of the hydraulic cylinder; the reciprocating assembly is arranged on the outer side of the hydraulic cylinder and used for driving the push rod to push the movable plug to slide in a reciprocating mode, the hydraulic cylinder comprises a cylinder sleeve and a sealing cover detachably arranged at the bottom of the cylinder sleeve, and the movable plug is arranged in the cylinder sleeve in a sliding mode; the reciprocating assembly drives the push rod to push the moving plug out of the cylinder sleeve after the hydraulic cylinder is turned over. The fatigue life test bed for the hydraulic sealing element can effectively solve the problem that the hydraulic sealing element is inconvenient to mount and dismount before and after a test in the prior art.

Description

Technical Field

[0001] The present invention relates to the technical field of seal detection, and particularly to a fatigue life test bench for hydraulic seals. Background Art

[0002] Hydraulic seals are the core components of hydraulic systems, mainly used to prevent liquid or gas leakage and ensure the stable operation of the system under complex working conditions such as high pressure, high temperature, and vibration; fatigue life testing is a key means to evaluate the performance degradation and failure mechanism of seals under cyclic loads, especially for complex working conditions such as high pressure and high-frequency vibration; fatigue life refers to the number of cycles of a seal from its initial state to complete failure (such as crack propagation and permanent deformation) under the action of cyclic pressure or mechanical stress.

[0003] In related technologies, in order to be able to simulate the fatigue life of hydraulic seals under the influence of vibration factors during the test, for example, the patent with the publication number CN118224157B in the prior art provides a multi-functional fatigue life testing machine for hydraulic seals. This device can simulate the working state of hydraulic seals and the vibration of the hydraulic cylinder itself during actual use by setting a second motor, a cam, a mounting plate, and a test component. After combining the two factors, the fatigue life of the hydraulic seal is detected through testing, improving the accuracy of the fatigue life detection of the hydraulic seal.

[0004] Although the above-mentioned prior art solution can achieve the effect of detecting the fatigue life of hydraulic seals under the influence of vibration factors by applying vibration forces to the hydraulic cylinder and the hydraulic seal, the hydraulic seal needs to be installed outside the hydraulic moving plug before the test, and the hydraulic moving plug is installed inside the hydraulic cylinder. It is necessary to disassemble the hydraulic moving plug from the hydraulic rod to install the hydraulic seal, and assembly is required after installation, resulting in inconvenience in installation and disassembly of the hydraulic seal before and after the test. Summary of the Invention

[0005] Aiming at the above-mentioned drawbacks of the prior art, the present invention provides a fatigue life test bench for hydraulic seals, which can effectively solve the problem that the hydraulic seal is inconvenient to install and disassemble before and after the test in the prior art.

[0006] To achieve the above objectives, the present invention is realized through the following technical solutions: The present invention provides a fatigue life test bench for hydraulic seals, including a test chamber. A hydraulic cylinder is configured in the test chamber. A moving plug is slidably arranged in the hydraulic cylinder. The hydraulic seal to be tested is detachably configured on one side of the moving plug so that when the moving plug moves in the hydraulic cylinder, the fatigue life of the hydraulic seal can be tested. The hydraulic cylinder is rotatably arranged inside the test chamber; and the hydraulic cylinder includes a cylinder sleeve and a sealing cover detachably configured on one side of the cylinder sleeve; One end of the movable plug is connected with a push rod, and the end of the push rod far away from the movable plug penetrates through the hydraulic cylinder and is arranged outside; A reciprocating assembly is connected to one side of the push rod. In the test state, the reciprocating assembly drives the movable plug to reciprocate in the hydraulic cylinder through the push rod; in the assembled state, after the hydraulic cylinder rotates relative to the test box, the reciprocating assembly can push the movable plug out of the hydraulic cylinder through the push rod.

[0007] Furthermore, a rotating assembly for driving the hydraulic cylinder to rotate relative to the test box is further included; the rotating assembly includes: A support arm is arranged on one side of the hydraulic cylinder; A fixed shaft is connected to one side of the support arm. The fixed shaft rotates through the test box, and a second driving member for driving the hydraulic cylinder to rotate is connected to one side of the fixed shaft.

[0008] Furthermore, a first pushing member is arranged on one side of the sealing cover. The first pushing member is used to push the sealing cover to seal or move away from one side of the cylinder sleeve; One end of the first pushing member far away from the sealing cover is rotatably connected to the fixed shaft.

[0009] Furthermore, the hydraulic cylinder further includes a fixed cylinder, and the fixed cylinder is communicated and arranged on one side of the cylinder sleeve; One end of the push rod is connected with a storage cylinder, and the storage cylinder can be communicated with the cylinder sleeve to store the hydraulic oil in the cylinder sleeve.

[0010] Furthermore, a communicating pipe is arranged at one end of the fixed cylinder facing the cylinder sleeve. The communicating pipe communicates the cylinder sleeve and the storage cylinder; A sealing ball is arranged at the communicating pipe. In the test state, the sealing ball plugs the communicating pipe.

[0011] Furthermore, a liquid outlet funnel is arranged at one end of the communicating pipe facing the storage cylinder; A liquid inlet funnel is arranged at one end of the communicating pipe far away from the storage cylinder.

[0012] Furthermore, a convex platform is arranged at one end of the storage cylinder close to the push rod, and the convex platform is arranged on the side wall of the storage cylinder; A ball groove for storing the sealing ball is arranged inside the convex platform.

[0013] Furthermore, a side plate is arranged on one side of the hydraulic cylinder, and a support frame is connected to one side of the side plate; The reciprocating assembly includes: A push plate is connected to one side of the push rod, and the push plate is slidably arranged in the support frame; A driving plate is slidably arranged in the support frame, and the driving plate is arranged on one side of the push plate, and the driving plate and the push plate are driven by a driving wheel; The pushing component is used for applying a reciprocating thrust to the driving plate; and the pushing component is slidably arranged on one side of the side plate.

[0014] Furthermore, the pushing component comprises: The driving member 1 is a motor, which is arranged on one side of the side plate, and the output end of the driving member 1 is connected to a connecting rod; The connecting plate is rotatably arranged on one side of the connecting rod, and the connecting plate is driven by a driving member to reciprocate and rise and fall to drive the driving plate to move.

[0015] Furthermore, a baffle is fixedly provided on one side of the side plate, and a slide plate is slidably provided on one side of the side plate; the pushing assembly further includes: A slide rod, one end of which slides through the connecting plate, and the other end of which is connected to the bottom of the driving plate; An elastic member, arranged on the outer side of the slide bar and located between the connecting plate and the driving plate; A pressure sensor is disposed on one side of the driving plate, and one side of the elastic member abuts against the pressure sensor; A slide is slidably arranged between the side plates, and the driving member is fixedly arranged on one side of the slide; in the test state, the slide is supported on the slide plate; in the assembled state, the slide is supported on the baffle plate; The adjusting member is a screw rod, which is arranged at the bottom end of the slide plate and is used to adjust the height of the slide table under the test state.

[0016] Compared with the prior art, the technical solution provided by the present invention has the following beneficial effects: The present invention is provided with a reciprocating assembly to provide reciprocating power for the push rod, so that the push rod can drive the moving plug to slide back and forth inside the hydraulic cylinder, thereby realizing a sealing fatigue life test of the hydraulic seal, and the pressure of the moving plug can be adjusted according to the test requirements, so as to detect the sealing fatigue life of the hydraulic seal under different hydraulic load conditions.

[0017] The present invention arranges a hydraulic cylinder rotatably inside a test box. When the hydraulic cylinder is turned over, the pushing component increases the pushing distance of the movable plug by its own gravity, so that after the hydraulic cylinder is turned over, the movable plug can be driven by the pushing component to move the hydraulic seal out of the interior of the hydraulic cylinder, so as to facilitate the installation and disassembly of the hydraulic seal. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0019] Figure 1 Schematic diagram of the three-dimensional structure of the embodiment of the present invention; Figure 2 Schematic diagram of the internal structure of the test chamber of the embodiment of the present invention; Figure 3 Schematic diagram of the structure of the hydraulic cylinder of the embodiment of the present invention; Figure 4 Schematic diagram of the assembly structure of the moving plug and the push rod of the embodiment of the present invention; Figure 5 Schematic diagram of the internal structure of the storage cylinder of the embodiment of the present invention; Figure 6 Schematic diagram of the structure of the reciprocating assembly of the embodiment of the present invention; Figure 7 Schematic diagram of the structure of the locking assembly of the embodiment of the present invention; Figure 8 Schematic diagram of the three-dimensional structure of another perspective of the embodiment of the present invention.

[0020] The reference numerals in the figure respectively represent: 100, hydraulic seal; 1, test chamber; 11, protective cover; 12, audible and visual alarm; 13, grating sensor; 14, lining board; 15, electric control cabinet; 2, hydraulic cylinder; 21, cylinder sleeve; 22, sealing cover; 221, sealing gasket; 222, pushing member one; 23, fixed cylinder; 231, bead groove; 24, side plate; 241, tapered groove; 25, slide rail; 26, baffle; 27, support plate; 28, column; 29, support frame; 3, moving plug; 4, push rod; 41, storage cylinder; 42, flange; 43, bolt; 44, liquid outlet funnel; 45, connecting pipe; 46, liquid inlet funnel; 47, sealing ring; 48, sealing ball; 49, boss; 410, ball groove; 411, fixed disk; 412, ball one; 5, reciprocating assembly; 51, push plate; 52, sleeve; 53, bottom plate; 531, through hole; 54, driving wheel; 55, driving plate; 56, pushing assembly; 561, sliding table; 562, driving member one; 563, cam; 564, fixing pin; 565, connecting rod; 566, connecting plate; 567, sliding rod; 568, elastic member; 569, pressure sensor; 57, sliding plate; 58, adjusting member; 59, turntable; 6. Rotating assembly; 61. Support arm; 62. Fixed shaft; 63. Second driving member; 7. Locking assembly; 71. Second pushing member; 72. Pushing plate; 73. Positioning pin; 8. Vibration plate; 81. Disc; 82. Bush; 83. Second ball; 84. Vibration drive; 85. Eccentric block. Specific implementation manner

[0021] To make the objectives, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Apparently, the described embodiments are some, but not all, of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0022] For the convenience of explaining the specific solution, in the specific implementation manner of the present application, Figure 1 the state shown by the hydraulic cylinder 2 is defined as the test state, and the state where the hydraulic cylinder 2 rotates 180° to assemble the hydraulic seal is defined as the assembly state. The definitions herein are only for the convenience of explaining the technical solution and are not specifically limited.

[0023] The present invention will be further described below with reference to the embodiments.

[0024] Please refer to Figures 1 - 8 , the present invention provides a technical solution: a fatigue life test bench for hydraulic seals, including a test chamber 1, a hydraulic cylinder 2, a moving plug 3, a push rod 4 and a reciprocating assembly 5. The hydraulic cylinder 2 is rotatably arranged inside the test chamber 1 under the drive of an external force; the moving plug 3 is slidably arranged inside the hydraulic cylinder 2, and a hydraulic seal 100 is detachably arranged on the outer side of the moving plug 3; one end of the push rod 4 is fixedly arranged on the top of the moving plug 3, and the other end penetrates through the top of the hydraulic cylinder 2; the reciprocating assembly 5 is arranged outside the hydraulic cylinder 2 and is used to drive the push rod 4 to push the moving plug 3 to reciprocate.

[0025] Wherein, the hydraulic cylinder 2 includes a cylinder liner 21 and a sealing cover 22 detachably arranged at the bottom of the cylinder liner 21. The moving plug 3 is slidably arranged inside the cylinder liner 21. In the test state, the reciprocating assembly 5 drives the moving plug 3 to reciprocate inside the hydraulic cylinder 2 through the push rod 4; in the assembly state after the hydraulic cylinder 2 rotates relative to the test chamber 1, the reciprocating assembly 5 can push the moving plug 3 out of the hydraulic cylinder 2 through the push rod 4.

[0026] In addition, a protective cover 11 is fixedly arranged on the top of the test chamber 1, and an audible and visual alarm 12 is fixedly arranged on the top of the protective cover 11 for alarming when the hydraulic seal 100 is fatigued. A grating sensor 13 is fixedly arranged on the inner side of the test chamber 1 at the operation station for detecting the position of the staff to prevent a safety accident caused by the rotation of the hydraulic cylinder 2 when the staff is inside the test chamber 1. A lining plate 14 is fixedly arranged inside the test chamber 1, and an arc surface concentric with the rotating end of the hydraulic cylinder 2 is arranged on the top of the lining plate 14 for guiding the leaked hydraulic oil, parts or impurities to be concentrated and collected at the bottom of the arc surface, facilitating subsequent cleaning work. An electric control cabinet 15 is fixedly arranged on the outside of the test chamber 1 for controlling the operation of the experimental equipment.

[0027] It should also be noted that a counter can be arranged on one side of the push rod 4 for counting the fatigue life of the hydraulic seal 100 to be tested.

[0028] The fatigue life test bench for hydraulic seals provided by the embodiment of the present invention further includes a rotating assembly 6 for driving the hydraulic cylinder 2 to rotate. The rotating assembly 6 includes support arms 61 symmetrically and fixedly arranged on the outside of the hydraulic cylinder 2. Fixed shafts 62 are fixedly arranged at the other ends of the support arms 61, and the fixed shafts 62 are respectively rotationally connected to both sides of the test chamber 1. A driving member two 63 for driving the fixed shaft 62 to rotate is fixedly arranged on the outside of the test chamber 1, and the driving member two 63 is a motor.

[0029] A sealing gasket 221 is fixedly arranged on the inner side of the sealing cover 22 for sealing the bottom of the cylinder sleeve 21. Pushing members one 222 are symmetrically arranged on the top of the sealing cover 22. The driving ends of the pushing members one 222 are fixedly connected to the sealing cover 22, and the other ends of the pushing members one 222 are rotationally connected to the fixed shaft 62. The function of the pushing member one 222 is to drive the sealing cover 22 to be sealed with or separated from the cylinder sleeve 21. Therefore, a power member with a linear output function, such as a hydraulic push rod, a pneumatic push rod or an electric push rod, can be selected.

[0030] The hydraulic cylinder 2 further includes a fixed cylinder 23. Side plates 24 are symmetrically and fixedly arranged on the outside of the fixed cylinder 23. A column 28 is fixedly arranged on the outside of the side plate 24, and a support frame 29 is fixedly arranged on the top of the column 28; The reciprocating assembly 5 includes a push plate 51, a driving plate 55 and a pushing assembly 56. The push plate 51 is arranged on the top of the push rod 4, and the push plate 51 is slidably arranged inside the support frame 29; the driving plate 55 is slidably arranged inside the support frame 29. Among them, both the push plate 51 and the driving plate 55 are rack-shaped plates. A driving wheel 54 is meshed on the side of the driving plate 55 close to the push plate 51. The driving wheel 54 is a gear, and the driving wheel 54 is meshed on the outside of the push plate 51. The driving wheel 54 is rotatably arranged inside the support frame 29; the pushing assembly 56 is used to apply a reciprocating thrust to the driving plate 55, and the pushing assembly 56 is slidably arranged between the two side plates 24.

[0031] The hydraulic seal fatigue life test bench further includes locking components 7 symmetrically arranged on both sides of the test chamber 1 for strengthening the test chamber 1 and the side plate 24; the locking component 7 includes a second driving member 71 fixedly arranged on the outside of the test chamber 1, a pushing plate 72 is fixedly arranged at the driving end of the second driving member 71, and a positioning pin 73 is fixedly arranged on the side of the pushing plate 72 close to the side plate 24; a tapered groove 241 is provided on the outside of the side plate 24 corresponding to the positioning pin 73, and the tapered groove 241 cooperates with the positioning pin 73. The function of the second driving member 71 is to move the pushing plate 72 and the positioning pin 73 closer to or away from the tapered groove 241 provided on the side plate 24. Similarly, a power member with a linear output function is selected, such as a hydraulic push rod, a pneumatic push rod or an electric push rod, etc.

[0032] The pushing component 56 includes a sliding table 561, a first driving member 562, a connecting plate 566, an elastic member 568 and a pressure sensor 569. The sliding table 561 is slidably arranged between the two side plates 24; the first driving member 562 is a motor fixedly arranged on the outside of the sliding table 561, and an output end of the first driving member 562 is fixedly connected with a cam 563. One end of the cam 563 is rotatably connected with a connecting rod 565 through a fixing pin 564; the connecting plate 566 is driven by the connecting rod 565 to reciprocate up and down. A sliding rod 567 is slidably arranged inside the connecting plate 566, and the other end of the sliding rod 567 is fixedly arranged at the bottom of the driving plate 55; the elastic member 568 is a spring located outside the sliding rod 567 and between the connecting plate 566 and the driving plate 55; the pressure sensor 569 is located between the driving plate 55 and the elastic member 568; The reciprocating component 5 further includes a sliding plate 57. The sliding plate 57 is slidably arranged between the side plates 24. A baffle 26 is fixedly arranged at the top of the side plate 24, and a support plate 27 is fixedly arranged at the bottom of the side plate 24. An adjusting member 58 for driving the sliding plate 57 to slide is threadedly connected inside the support plate 27. The adjusting member 58 is a screw rod for adjusting the height of the sliding table 561 in the test state, and the bottom end of the adjusting member 58 is fixedly connected with a turntable 59.

[0033] The above-mentioned hydraulic component fatigue life test bench further includes a vibration plate 8. The vibration plate 8 is driven by an external force to generate vibration for triggering the vibration of the push rod 4. A disc 81 is fixedly arranged at the bottom of the vibration plate 8, a second row of balls 83 is annularly arranged at the bottom of the disc 81, a bushing 82 is fixedly arranged inside the disc 81, and the bushing 82 is slidably arranged on the outside of the push rod 4. The second row of balls 83 is located at the top of the fixed cylinder 23; the top end of the push rod 4 is movably connected with the push plate 51.

[0034] A fixed disk 411 is fixedly arranged at the top end of the push rod 4, and a first ball 412 is arranged inside the fixed disk 411; a sleeve 52 is fixedly arranged at the bottom of the push plate 51, a bottom plate 53 is fixedly arranged at the bottom of the sleeve 52, a through hole 531 is formed inside the bottom plate 53, the diameter of the through hole 531 is larger than the diameter of the push rod 4, and the first ball 412 is located between the sleeve 52 and the bottom plate 53.

[0035] The fixed cylinder 23 and the cylinder sleeve 21 are detachably arranged, the push rod 4 and the moving plug 3 are detachably arranged, a flange 42 is fixedly arranged at one end of the push rod 4, bolts 43 are arranged in a circular array at the bottom of the flange 42, and the flange 42 is fixedly connected with the moving plug 3 through the bolts 43.

[0036] A storage cylinder 41 is fixedly arranged between the push rod 4 and the flange 42, a liquid outlet funnel 44 is installed at the bottom of the storage cylinder 41, a liquid inlet funnel 46 is fixedly arranged at the bottom of the liquid outlet funnel 44 through a connecting pipe 45, a sealing ring 47 is arranged outside the liquid inlet funnel 46, the liquid inlet funnel 46 is located outside the moving plug 3, and the two are sealed through the sealing ring 47. A sealing ball 48 for blocking the connecting pipe 45 is arranged inside the liquid outlet funnel 44; a boss 49 is fixedly arranged near the top inside the storage cylinder 41, and a ball groove 410 is formed inside the boss 49 for storing the sealing ball 48.

[0037] Principle and advantages of the hydraulic seal fatigue life test bench: First, after the hydraulic seal 100 is assembled, the drive part 562 in the pushing component 56 is started to operate through the electric control cabinet 15 outside the test box 1, so that the drive part 562 drives the cam 563 to rotate. The protruding part of the cam 563 drives the connecting rod 565 to move through the fixed pin 564, so that the connecting rod 565 drives the connecting plate 566 at the other end to reciprocate up and down. Furthermore, the connecting plate 566 pushes the driving plate 55 to reciprocate inside the support frame 29. The driving plate 55 drives the push plate 51 to reciprocate up and down inside the support frame 29 through the driving wheel 54, providing push-pull power for the push rod 4 at the bottom, so that the push rod 4 drives the moving plug 3 to reciprocate inside the hydraulic cylinder 2, realizing the sealing fatigue life detection of the hydraulic seal 100 outside the moving plug 3. In order to facilitate the adjustment of the test pressure of the hydraulic seal 100, the turntable 59 is rotated to drive the adjusting member 58 to rotate. When the adjusting member 58 rotates inside the support plate 27, it drives the slide plate 57 to slide along the slide rail 25. The slide rail 25 is fixedly arranged between the side plates 24 on both sides to ensure the stability of the sliding of the slide plate 57 and the slide table 561. After the slide plate 57 pushes the slide table 561 to move, the driving distance of the connecting plate 566 to the push plate 51 changes accordingly. In order to prevent overpressure and ensure the smooth progress of the test, a slide rod 567 is provided between the connecting plate 566 and the driving plate 55 for movable connection. After the connecting plate 566 slides the driving plate 55 by a certain distance, the push plate 51 drives the movable plug 3 to start generating pressure through the push rod 4. As the connecting plate 566 continues to rise, it will slide with the slide rod 567, and then squeeze the elastic member 568 to press tightly against the pressure sensor 569. At this time, the pressure received by the hydraulic seal 100 can be judged through the detection result of the pressure sensor 569. When the hydraulic seal 100 loses its sealing performance, the detection result of the pressure sensor 569 will become smaller, so as to facilitate the timely detection of the sealing fatigue life of the hydraulic seal 100; When installing and disassembling the hydraulic seal 100, the electric control cabinet 15 is used to control the operation of the second driving member 63, so that the second driving member 63 drives the fixed shaft 62 to rotate. The fixed shaft 62 drives the hydraulic cylinder 2 to rotate 180° through the support arm 61. At this time, the cylinder sleeve 21 in the hydraulic cylinder 2 drives the sealing cover 22 to rotate from the bottom to the top. At the same time, the slide table 561 relies on its own gravity to slide along the slide rail 25 towards the baffle 26, so that the pushing assembly 56 pushes the driving plate 55 to slide a certain distance, and then the push plate 51 pushes the push rod 4 to push the movable plug 3 towards the port of the cylinder sleeve 21. After the hydraulic cylinder 2 stops rotating, the first pushing member 222 is used to drive the sealing cover 22 away from the cylinder sleeve 21, so that the sealing gasket 221 releases the seal of the cylinder sleeve 21. Then, the pushing assembly 56 is started to operate, so that the push plate 51 further pushes the push rod 4 to push the movable plug 3 out of the inside of the cylinder sleeve 21, so as to facilitate the removal and installation of the movable plug 3 and the hydraulic seal 100 outside it from the inside of the cylinder sleeve 21; After the hydraulic seal 100 is disassembled and installed, the pushing assembly 56 continues to operate to pull the movable plug 3 and the hydraulic seal 100 into the inside of the cylinder sleeve 21. Then, the first pushing member 222 is used to drive the sealing cover 22 to be hermetically assembled at the end of the cylinder sleeve 21. Finally, the hydraulic cylinder 2 is rotated to the initial state through the rotating assembly 6.

[0038] It should be noted that the above test method has the following advantages: Advantage 1: By setting the reciprocating component 5 to provide reciprocating power for the push rod 4, the push rod 4 can drive the moving plug 3 to reciprocate inside the hydraulic cylinder 2, realizing the sealing fatigue life test of the hydraulic seal 100, and the pressure of the moving plug 3 can be adjusted according to the test requirements, so as to detect the sealing fatigue life of the hydraulic seal 100 under different hydraulic load conditions.

[0039] Advantage 2: By setting the rotating component 6 to drive the hydraulic cylinder 2 to flip inside the test box 1, during the flipping process, the pushing component 56 relies on its own gravity to increase the pushing distance of the moving plug 3, so that after the hydraulic cylinder 2 flips, the pushing component 56 can drive the moving plug 3 to drive the hydraulic seal 100 out of the inside of the hydraulic cylinder 2, facilitating the installation and disassembly of the hydraulic seal 100.

[0040] Advantage 3: By setting the adjusting part 58 to adjust the height of the sliding plate 57, the sliding plate 57 drives the pushing component 56 to be at different heights, so as to adjust the hydraulic load of the moving plug 3. When the hydraulic cylinder 2 flips, the pushing component 56 will be located on the top of the baffle 26. At this time, the pushing component 56 drives the moving plug 3 to approach the top of the cylinder liner 21 in the state of not generating thrust. When the pushing component 56 generates thrust, it automatically pushes the moving plug 3 out, so that the adjustment of the height of the pushing component 56 will not affect the pushing distance of the pushing component 56 on the moving plug 3.

[0041] Advantage 4: By setting the pressure sensor 569, before the test, after applying thrust to the push rod 4 through the pushing component 56, the load of the moving plug 3 is adjusted by adjusting the height of the pushing component 56, so that the connecting plate 566 pushes the elastic member 568 to apply pressure to the pressure sensor 569. The test load of the moving plug 3 can be obtained according to the initial detection result of the pressure sensor 569, and when the hydraulic seal 100 is fatigued, the change of the detection result of the pressure sensor 569 can reflect that the hydraulic seal 100 has reached the sealing fatigue life.

[0042] Advantage 5: By detachably setting the cylinder liner 21 and the fixed cylinder 23, and detachably setting the push rod 4 and the moving plug 3, it is convenient to replace the cylinder liner 21 and the moving plug 3 of the corresponding specifications according to the test requirements, so that the test bench can adapt to different models of hydraulic seals 100.

[0043] When the hydraulic cylinder 2 in the hydraulic seal fatigue life test bench of the present application flips, the sealing ball 48 located inside the liquid outlet funnel 44 releases the blockage of the communication pipe 45 by its own gravity, so that the hydraulic oil inside the cylinder liner 21 enters the inside of the storage cylinder 41 through the communication pipe 45 for storage. As the rotation angle of the hydraulic cylinder 2 gradually tilts upward, finally all the hydraulic oil inside the cylinder liner 21 is recovered into the inside of the storage cylinder 41, and there is no need to additionally connect a hydraulic oil supply device; And the sealing ball 48 eventually approaches the push rod 4 and falls into the ball groove 410. When the hydraulic cylinder 2 rotates downward to reset more than 90 degrees, the sealing ball 48 is restricted by the ball groove 410 and will not fall into the liquid outlet funnel 44 first. At this time, the hydraulic oil in the storage cylinder 41 gradually flows into the cylinder sleeve 21 through the connecting pipe 45, and the movable plug 3 in the cylinder sleeve 21 automatically slides upward under the influence of the gravity of the pushing component 56, leaving space for the hydraulic oil to be discharged, and the suction force of the movable plug 3 can accelerate the discharge of the hydraulic oil, so as to ensure that the sealing ball 48 discharges the hydraulic oil into the cylinder sleeve 21 before leaving the ball groove 410. When the hydraulic cylinder 2 reaches a certain tilt angle, the sealing ball 48 automatically moves from the ball groove 410 to the liquid outlet funnel 44 by its own gravity, and blocks the connecting pipe 45 by its own gravity. The mass of the sealing ball 48 meets the maximum pressure on the hydraulic oil during the test, preventing the hydraulic oil from being squeezed by the moving plug 3 and pushing the sealing ball 48 to move and leak.

[0044] It is worth mentioning that the above flipping method has the following advantages: Advantage 1: By providing a storage tube 41, the hydraulic oil inside the cylinder sleeve 21 can be automatically stored during the flipping process. When the hydraulic cylinder 2 is reset, the internal hydraulic oil is automatically discharged for use in subsequent tests. There is no need to add a separate hydraulic oil supply device, which reduces the test cost while ensuring that the hydraulic cylinder 2 can rotate smoothly.

[0045] Advantage two, by arranging a liquid outlet funnel 44 at the bottom of the storage cylinder 41, the liquid outlet funnel 44 facilitates to guide the hydraulic oil inside the cylinder sleeve 21 to the inside of the connecting pipe 45 through the liquid inlet funnel 46 at the bottom, and the connecting pipe 45 can be sealed during the test process through the sealing ball 48 inside the liquid outlet funnel 44 to ensure the sealing of the hydraulic seal 100 during the test process. When the hydraulic cylinder 2 is turned over to install or remove the hydraulic seal 100, the sealing ball 48 automatically releases the blockage of the connecting pipe 45 by its own gravity, so as to automatically recover the hydraulic oil.

[0046] Advantage three, by setting the sealing ball 48 to seal the connecting pipe 45, the sealing ball 48 can automatically release the blockage of the connecting pipe 45 when the hydraulic cylinder 2 flips over, and as the hydraulic cylinder 2 continues to rotate, the sealing ball 48 falls into the ball groove 410. Under the action of the ball groove 410, the sealing ball 48 remains stable during the resetting process of the hydraulic cylinder 2. After the hydraulic oil is discharged into the cylinder sleeve 21, the sealing ball 48 relies on its own gravity to break away from the ball groove 410 and automatically seal the connecting pipe 45, which is more convenient to use.

[0047] Advantage 4: By slidably arranging the pushing component 56 between the side plates 24 on both sides, when the hydraulic cylinder 2 rotates downward by an angle exceeding 90°, the hydraulic oil inside the storage cylinder 41 starts to be discharged into the cylinder sleeve 21. At the same time, the pushing component 56 relies on its own gravity to move closer to the sliding plate 57 along the slide rail 25 to reset, so that the pushing component 56 drives the moving plug 3 to slide upward through the push rod 4, thereby automatically making space for the discharge of the hydraulic oil. At the same time, a negative pressure will be generated when the moving plug 3 slides, which is beneficial to the rapid discharge of the hydraulic oil inside the storage cylinder 41 to ensure that the hydraulic oil is discharged into the cylinder sleeve 21 before the sealing ball 48 disengages from the ball groove 410.

[0048] In practical applications, the reciprocating driving method of the push plate 51 for the push rod 4: The reciprocating driving of the moving plug 3 is realized by the push plate 51 pushing the push rod 4 to reciprocate up and down. At the same time, the vibration drive 84 at the top of the vibration plate 8 is started, so that the vibration drive 84 drives the eccentric block 85 to rotate, causing the entire vibration plate 8 to vibrate. This vibration is transmitted to the push rod 4 through the bushing 82, and the push rod 4 transmits the vibration to the hydraulic seal 100 outside the moving plug 3 to simulate the fatigue life of the hydraulic seal 100 under vibration conditions. During the vibration of the push rod 4, the second ball 83 at the bottom of the disc 81 rolls inside the bead groove 231 at the top of the fixed cylinder 23 to reduce the resistance between the vibration plate 8 and the fixed cylinder 23 and prevent wear. At the same time, the fixed plate 411 at the top of the push rod 4 drives the first ball 412 to roll between the sleeve 52 and the bottom plate 53, so that the push rod 4 and the push plate 51 are always kept connected while ensuring the vibration state of the push rod 4.

[0049] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements for some of the technical features; and these modifications or replacements will not cause the essence of the corresponding technical solutions to deviate from the protection scope of the technical solutions of the embodiments of the present invention.

Claims

1. A hydraulic seal fatigue life test bench, comprising a test box (1), wherein a hydraulic cylinder (2) is arranged in the test box (1), a movable plug (3) is slidably arranged in the hydraulic cylinder (2), and a hydraulic seal (100) to be tested is detachably arranged on one side of the movable plug (3), so that the fatigue life of the hydraulic seal (100) can be tested when the movable plug (3) moves in the hydraulic cylinder (2), characterized in that: The hydraulic cylinder (2) is rotatably arranged inside the test box (1); and the hydraulic cylinder (2) comprises a cylinder sleeve (21) and a sealing cover (22) detachably arranged on one side of the cylinder sleeve (21); One end of the movable plug (3) is connected to a push rod (4), and the end of the push rod (4) away from the movable plug (3) is disposed through the hydraulic cylinder (2); A reciprocating assembly (5) is connected to one side of the push rod (4). In a test state, the reciprocating assembly (5) drives the movable plug (3) to move back and forth in the hydraulic cylinder (2) through the push rod (4); in an assembled state after the hydraulic cylinder (2) is rotated relative to the test box (1), the reciprocating assembly (5) can push the movable plug (3) out of the hydraulic cylinder (2) through the push rod (4).

2. The hydraulic seal fatigue life test bench according to claim 1 is characterized in that: It also includes a rotating assembly (6) for driving the hydraulic cylinder (2) to rotate relative to the test box (1); the rotating assembly (6) includes: A support arm (61) is arranged on one side of the hydraulic cylinder (2); A fixed shaft (62) is connected to one side of the support arm (61), and the fixed shaft (62) is rotatably arranged to pass through the test box (1). One side of the fixed shaft (62) is connected to a second driving member (63) for driving the hydraulic cylinder (2) to rotate.

3. The hydraulic seal fatigue life test bench according to claim 2 is characterized in that: A pusher member 1 (222) is provided on one side of the sealing cover (22), and the pusher member 1 (222) is used to push the sealing cover (22) to seal on or away from one side of the cylinder sleeve (21); One end of the pushing member 1 (222) away from the sealing cover (22) is rotatably connected to the fixed shaft (62).

4. The hydraulic seal fatigue life test bench according to claim 1, characterized in that: The hydraulic cylinder (2) further comprises a fixed cylinder (23), wherein the fixed cylinder (23) is arranged in communication with one side of the cylinder sleeve (21); One end of the push rod (4) is connected to a receiving cylinder (41), and the receiving cylinder (41) can be in communication with the cylinder sleeve (21) to receive the hydraulic oil in the cylinder sleeve (21).

5. The hydraulic seal fatigue life test bench according to claim 4 is characterized in that: A connecting pipe (45) is provided at one end of the fixing cylinder (23) facing the cylinder sleeve (21), wherein the connecting pipe (45) connects the cylinder sleeve (21) and the storage cylinder (41); A sealing ball (48) is arranged at the connecting pipe (45); in a test state, the sealing ball (48) is sealed at the connecting pipe (45).

6. The hydraulic seal fatigue life test bench according to claim 5, characterized in that: A liquid outlet funnel (44) is provided at one end of the connecting tube (45) facing the storage cylinder (41); A liquid inlet funnel (46) is provided at one end of the connecting tube (45) away from the storage cylinder (41).

7. The hydraulic seal fatigue life test bench according to claim 5, characterized in that: A boss (49) is provided at one end of the storage tube (41) close to the push rod (4), and the boss (49) is provided on the side wall of the storage tube (41); A ball groove (410) for accommodating a sealing ball (48) is provided on the inner side of the boss (49).

8. The hydraulic seal fatigue life test bench according to claim 1, characterized in that: A side plate (24) is provided on one side of the hydraulic cylinder (2), and a support frame (29) is connected to one side of the side plate (24); The reciprocating assembly (5) comprises: A push plate (51) connected to one side of the push rod (4), the push plate (51) being slidably disposed in the support frame (29); A driving plate (55) is slidably disposed in the support frame (29), and the driving plate (55) is disposed on one side of the push plate (51), and the driving plate (55) and the push plate (51) are driven by a driving wheel (54); The pushing component (56) is used to apply a reciprocating thrust to the driving plate (55); and the pushing component (56) is slidably disposed on one side of the side plate (24).

9. The hydraulic seal fatigue life test bench according to claim 8, characterized in that: The pushing assembly (56) comprises: The driving member 1 (562) is a motor, which is arranged on one side of the side plate (24); the output end of the driving member 1 (562) is connected to a connecting rod (565); The connecting plate (566) is rotatably arranged on one side of the connecting rod (565). The connecting plate (566) is driven by the driving member 1 (562) to reciprocate and rise and fall to drive the driving plate (55) to move.

10. The hydraulic seal fatigue life test bench according to claim 9, characterized in that: A baffle (26) is fixedly provided on one side of the side plate (24), and a slide plate (57) is slidably provided on one side of the side plate (24); the pushing component (56) further comprises: A sliding rod (567), one end of which slides through the connecting plate (566), and the other end of the sliding rod (567) is connected to the bottom of the driving plate (55); An elastic member (568) is arranged on the outside of the sliding rod (567) and is located between the connecting plate (566) and the driving plate (55); A pressure sensor (569) is disposed on one side of the driving plate (55), and one side of the elastic member (568) abuts against the pressure sensor (569); The slide (561) is slidably disposed between the side plates (24), and the driving member (562) is fixedly disposed on one side of the slide (561); in a test state, the slide (561) is supported on the slide plate (57); in an assembled state, the slide (561) is supported on the baffle plate (26); The adjusting member (58) is a screw rod, which is arranged at the bottom end of the slide plate (57) and is used to adjust the height of the slide table (561) in the test state.

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