Hydraulic Seal Fatigue Life Test Bench

Abstract

The present invention relates to the technical field of seal detection, and discloses a hydraulic seal fatigue life test bench, comprising a test box; a hydraulic cylinder, which is driven to rotate by an external force and is arranged inside the test box; a movable plug, which is slidably arranged inside the hydraulic cylinder, and a hydraulic seal is detachably arranged on the outer side of the movable plug; a push rod, one end of which is fixedly arranged on the top of the movable plug, and the other end is penetrated and arranged on the top of the hydraulic cylinder; a reciprocating assembly, which is arranged on the outer side of the hydraulic cylinder and is used to drive the push rod to push the movable plug to slide back and forth, wherein the hydraulic cylinder comprises a cylinder sleeve and a sealing cover detachably arranged at the bottom of the cylinder sleeve, and a movable plug is slidably arranged inside the cylinder sleeve, and the reciprocating assembly drives the push rod to push the movable plug out of the cylinder sleeve after the hydraulic cylinder is turned over. The hydraulic seal fatigue life test bench can effectively solve the problem in the prior art that hydraulic seals are inconvenient to install and disassemble before and after the test.

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 that a seal undergoes from its initial state to complete failure (such as crack propagation and permanent deformation) under cyclic pressure or mechanical stress.

[0003] In related technologies, in order 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 these 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 prior art solution can achieve the effect of detecting the fatigue life of hydraulic seals under the influence of vibration factors by applying vibration force to the hydraulic cylinder and the hydraulic seal, the hydraulic seal needs to be installed outside the hydraulic moving plug before the test. The hydraulic moving plug is installed inside the hydraulic cylinder, and the hydraulic moving plug and the hydraulic rod need to be disassembled from each other to install the hydraulic seal. After installation, assembly is also required, resulting in inconvenience in installing and disassembling the hydraulic seal before and after the test. Summary of the Invention

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

[0007] The present invention provides a fatigue life test bench for hydraulic seals, including a test chamber, in which a hydraulic cylinder is configured. A moving plug is slidably arranged in the hydraulic cylinder, and 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 is 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;

[0008] One end of the moving plug is connected with a push rod, and the end of the push rod away from the moving plug passes through the hydraulic cylinder;

[0009] A reciprocating assembly is connected to one side of the push rod. In the test state, the reciprocating assembly drives the moving plug to reciprocate in the hydraulic cylinder through the push rod; in the assembled state, after the hydraulic cylinder rotates relative to the test chamber, the reciprocating assembly can push the moving plug out of the hydraulic cylinder through the push rod.

[0010] Furthermore, it further includes a rotating assembly for driving the hydraulic cylinder to rotate relative to the test chamber; the rotating assembly includes:

[0011] A support arm, arranged on one side of the hydraulic cylinder;

[0012] A fixed shaft, connected to one side of the support arm, the fixed shaft rotatably passes through the test chamber, and a driving member two for driving the hydraulic cylinder to rotate is connected to one side of the fixed shaft.

[0013] Furthermore, a pushing member one is arranged on one side of the sealing cover, and the pushing member one is used to push the sealing cover to seal or move away from one side of the cylinder sleeve;

[0014] The end of the pushing member one away from the sealing cover is rotatably connected to the fixed shaft.

[0015] Furthermore, the hydraulic cylinder further includes a fixed cylinder, and the fixed cylinder is communicated and arranged on one side of the cylinder sleeve;

[0016] One end of the push rod is connected with a receiving cylinder, and the receiving cylinder can be communicated with the cylinder sleeve to receive the hydraulic oil in the cylinder sleeve.

[0017] Furthermore, a communicating pipe is arranged at one end of the fixed cylinder facing the cylinder sleeve, and the communicating pipe communicates the cylinder sleeve and the receiving cylinder;

[0018] A sealing ball is arranged at the communicating pipe. In the test state, the sealing ball blocks the communicating pipe.

[0019] Furthermore, a liquid outlet funnel is arranged at one end of the communicating pipe facing the receiving cylinder;

[0020] A liquid inlet funnel is arranged at one end of the connecting pipe away from the storage cylinder.

[0021] Furthermore, a boss is provided at one end of the storage tube close to the push rod, and the boss is provided at the side wall of the storage tube;

[0022] A ball groove for accommodating a sealing ball is provided on the inner side of the boss.

[0023] Furthermore, a side plate is provided on one side of the hydraulic cylinder, and a support frame is connected to one side of the side plate;

[0024] The reciprocating assembly comprises:

[0025] A push plate connected to one side of the push rod, wherein the push plate is slidably disposed in the support frame;

[0026] 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;

[0027] 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.

[0028] Furthermore, the pushing component comprises:

[0029] 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;

[0030] 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.

[0031] 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:

[0032] 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;

[0033] An elastic member, arranged on the outer side of the slide bar and located between the connecting plate and the driving plate;

[0034] A pressure sensor is disposed on one side of the driving plate, and one side of the elastic member abuts against the pressure sensor;

[0035] 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;

[0036] 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.

[0037] The technical solution provided by the present invention has the following beneficial effects compared with the prior art:

[0038] The present invention is provided with a reciprocating assembly to provide reciprocating power for the push rod, enabling the push rod to drive the moving plug to reciprocate inside the hydraulic cylinder, realizing the 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.

[0039] The present invention rotatably arranges the hydraulic cylinder inside the test chamber. When the hydraulic cylinder is flipped, the pushing assembly relies on its own gravity to increase the pushing distance of the moving plug, so that after the hydraulic cylinder is flipped, the moving plug can be driven by the pushing assembly to drive the hydraulic seal out of the inside of the hydraulic cylinder, facilitating the installation and disassembly of the hydraulic seal. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] In order 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 use in 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.

[0041] Figure 1 It is a three-dimensional structural schematic diagram of an embodiment of the present invention;

[0042] Figure 2 It is a structural schematic diagram inside the test chamber of an embodiment of the present invention;

[0043] Figure 3 It is a structural schematic diagram of the hydraulic cylinder of an embodiment of the present invention;

[0044] Figure 4 It is an assembly structural schematic diagram of the moving plug and the push rod of an embodiment of the present invention;

[0045] Figure 5 It is a structural schematic diagram inside the storage cylinder of an embodiment of the present invention;

[0046] Figure 6 It is a structural schematic diagram of the reciprocating assembly of an embodiment of the present invention;

[0047] Figure 7 It is a structural schematic diagram of the locking assembly of an embodiment of the present invention;

[0048] Figure 8 It is a three-dimensional structural schematic diagram of another perspective of an embodiment of the present invention.

[0049] The reference numerals in the drawings respectively represent: 100, hydraulic seal;

[0050] 1. Test chamber; 11. Protective cover; 12. Acoustic-optic alarm; 13. Grating sensor; 14. Liner; 15. Electric control cabinet;

[0051] 2. Hydraulic cylinder; 21. Cylinder liner; 22. Sealing cover; 221. Sealing gasket; 222. First pusher; 23. Fixed cylinder; 231. Ball groove; 24. Side plate; 241. Conical groove; 25. Slide rail; 26. Baffle; 27. Support plate; 28. Column; 29. Support frame;

[0052] 3. Moving plug;

[0053] 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. First ball;

[0054] 5. Reciprocating assembly; 51. Push plate; 52. Sleeve; 53. Bottom plate; 531. Through hole; 54. Driving wheel; 55. Driving plate; 56. Pushing assembly; 561. Slide; 562. First driver; 563. Cam; 564. Fixed pin; 565. Connecting rod; 566. Connecting plate; 567. Slide bar; 568. Elastic member; 569. Pressure sensor; 57. Slide plate; 58. Adjusting member; 59. Turntable;

[0055] 6. Rotating assembly; 61. Support arm; 62. Fixed shaft; 63. Second driver;

[0056] 7. Locking assembly; 71. Second pusher; 72. Pushing plate; 73. Positioning pin;

[0057] 8. Vibration plate; 81. Disk; 82. Bush; 83. Second ball; 84. Vibration drive; 85. Eccentric block. Detailed implementation manners

[0058] 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.

[0059] For the convenience of explaining the specific solutions, in the detailed implementation manners of this application Figure 1The state shown by the hydraulic cylinder 2 is defined as the test state, and the state where the hydraulic cylinder 2 rotates 180° for assembling the hydraulic seal is defined as the assembling state. The definitions here are only for facilitating the description of the technical solution and are not specifically limited.

[0060] The present invention will be further described below in conjunction with embodiments.

[0061] 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 outside 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.

[0062] Among them, the hydraulic cylinder 2 includes a cylinder sleeve 21 and a sealing cover 22 detachably arranged at the bottom of the cylinder sleeve 21. The moving plug 3 is slidably arranged inside the cylinder sleeve 2. 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 assembling 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.

[0063] 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 fails due to fatigue. 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 outside the test chamber 1 for controlling the operation of the experimental equipment.

[0064] 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.

[0065] 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 outer side of the hydraulic cylinder 2. Fixed shafts 62 are fixedly arranged at the other ends of the support arms 61. The fixed shafts 62 are respectively rotatably connected to both sides of the test chamber 1. A second driving member 63 for driving the fixed shaft 62 to rotate is fixedly arranged on the outer side of the test chamber 1. The second driving member 63 is a motor.

[0066] A sealing gasket 221 is fixedly arranged on the inner side of the sealing cover 22 for sealing the bottom of the cylinder liner 21. Pushing members 222 are symmetrically arranged on the top of the sealing cover 22. The driving ends of the pushing members 222 are fixedly connected to the sealing cover 22, and the other ends of the pushing members 222 are rotatably connected to the fixed shaft 62. The function of the pushing members 222 is to drive the sealing cover 22 to seal or disengage from the cylinder liner 21. Therefore, a power member with a linear output function can be selected, such as a hydraulic push rod, a pneumatic push rod, or an electric push rod, etc.

[0067] The hydraulic cylinder 2 further includes a fixed cylinder 23. Side plates 24 are symmetrically and fixedly arranged on the outer side of the fixed cylinder 23. Columns 28 are fixedly arranged on the outer side of the side plates 24. A support frame 29 is fixedly arranged at the top of the columns 28;

[0068] 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 outer side 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.

[0069] The fatigue life test bench for hydraulic seals further includes locking assemblies 7 symmetrically arranged on both sides of the test chamber 1 for strengthening the test chamber 1 and the side plates 24; the locking assemblies 7 include a second pushing member 71 fixedly arranged on the outer side of the test chamber 1. A pushing plate 72 is fixedly arranged at the driving end of the second pushing member 71. 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 outer side 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 pushing member 71 is to move the pushing plate 72 and the positioning pin 73 closer to or farther 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.

[0070] The driving 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 side plates 24 on both sides; the first driving member 562 is a motor, fixedly arranged outside 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.

[0071] 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 supporting 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 supporting plate 27. The adjusting member 58 is a screw rod, used to adjust the height of the sliding table 561 in the test state. The bottom end of the adjusting member 58 is fixedly connected with a turntable 59.

[0072] The above hydraulic component fatigue life test bench further includes a vibrating plate 8. The vibrating plate 8 is driven by an external force to vibrate, used to trigger the vibrating of the push rod 4. A disc 81 is fixedly arranged at the bottom of the vibrating 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. The bushing 82 is slidably arranged outside the push rod 4, and 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.

[0073] A fixing disc 411 is fixedly arranged at the top end of the push rod 4, and a first row of balls 412 is arranged inside the fixing disc 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 opened 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 row of balls 412 is located between the sleeve 52 and the bottom plate 53.

[0074] The fixed cylinder 23 and the cylinder sleeve 21 are detachably arranged, and 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. A bolt 43 is annularly arranged at the bottom of the flange 42. The flange 42 is fixedly connected with the moving plug 3 through the bolt 43.

[0075] 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 opened inside the boss 49 for storing the sealing ball 48.

[0076] Principle and advantages of the hydraulic seal fatigue life test bench:

[0077] First, after the hydraulic seal 100 is assembled, the drive member 562 in the pushing assembly 56 is started to operate through the electric control cabinet 15 outside the test chamber 1, so that the drive member 562 drives the cam 563 to rotate. The protruding part of the cam 563 drives the connecting rod 565 to move through the fixing 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;

[0078] 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 sliding 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 sliding stability of the sliding plate 57 and the sliding table 561. When the sliding plate 57 pushes the sliding 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 sliding rod 567 is arranged between the connecting plate 566 and the driving plate 55 for movable connection. When the connecting plate 566 slides the driving plate 55 by a certain distance, the push plate 51 starts to generate pressure by pushing the moving plug 3 through the push rod 4. As the connecting plate 566 continues to rise, it will slide with the sliding rod 567, and then squeeze the elastic member 568 to press 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.

[0079] When installing and disassembling the hydraulic seal 100, the second driving member 63 is controlled to operate through the electric control cabinet 15, so that the second driving member 63 drives the fixed shaft 62 to rotate, and 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 sliding table 561 slides close to the baffle 26 along the slide rail 25 by its own gravity, 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 moving plug 3 towards the port of the cylinder sleeve 21. When the hydraulic cylinder 2 stops rotating, the sealing cover 22 is driven away from the cylinder sleeve 21 by the first pushing member 222, 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 moving plug 3 out of the inside of the cylinder sleeve 21, so as to facilitate the removal and installation of the moving plug 3 and the hydraulic seal 100 outside it from the inside of the cylinder sleeve 21;

[0080] After the hydraulic seal 100 is disassembled and installed, the moving plug 3 and the hydraulic seal 100 are pulled into the inside of the cylinder sleeve 21 by the continuous operation of the pushing assembly 56, and then the sealing cover 22 is driven by the first pushing member 222 to be hermetically assembled at the end of the cylinder sleeve 21. Finally, the hydraulic cylinder 2 is driven to rotate to the initial state by the rotating assembly 6.

[0081] It should be noted that the above test method has the following advantages:

[0082] Advantage 1: By setting the reciprocating assembly 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, so as to realize 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.

[0083] Advantage 2: By setting the rotating assembly 6 to drive the hydraulic cylinder 2 to flip inside the test box 1, during the flipping process, the pushing assembly 56 increases the pushing distance of the moving plug 3 by its own gravity. After the hydraulic cylinder 2 flips, the pushing assembly 56 can drive the moving plug 3 to drive the hydraulic seal 100 out of the inside of the hydraulic cylinder 2, so as to facilitate the installation and disassembly of the hydraulic seal 100.

[0084] Advantage three, by setting the adjustment member 58 to adjust the height of the slide plate 57, the slide plate 57 drives the pushing component 56 to be located at different heights, so as to adjust the hydraulic load of the movable plug 3. When the hydraulic cylinder 2 is flipped, the pushing component 56 will be located at the top of the baffle 26. At this time, the pushing component 56 drives the movable plug 3 to approach the top of the cylinder sleeve 21 without generating thrust. When the pushing component 56 generates thrust, it automatically pushes the movable plug 3 out, so that the height adjustment of the pushing component 56 will not affect the pushing distance of the movable plug 3 by the pushing component 56.

[0085] Advantage four, by setting up the pressure sensor 569, before conducting the test, after the thrust is applied to the push rod 4 through the pushing component 56, the load of the movable 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, and the test load of the movable plug 3 can be obtained based on the initial detection result of the pressure sensor 569, and when the hydraulic seal 100 is fatigued, the change in the detection result of the pressure sensor 569 can reflect that the hydraulic seal 100 has reached the sealing fatigue life.

[0086] Advantage five: by making the cylinder sleeve 21 and the fixed cylinder 23 detachable, and making the push rod 4 and the movable plug 3 detachable, it is convenient to replace the cylinder sleeve 21 and the movable plug 3 of corresponding specifications according to the test requirements, so that the test bench can adapt to different models of hydraulic seals 100.

[0087] When the hydraulic cylinder 2 in the hydraulic seal fatigue life test bench of the present application is turned over, the sealing ball 48 located inside the liquid outlet funnel 44 releases the blockage of the connecting pipe 45 by its own gravity, so that the hydraulic oil inside the cylinder sleeve 21 enters the interior of the storage cylinder 41 through the connecting pipe 45 for storage. As the hydraulic cylinder 2 rotates, it gradually tilts upward, and finally all the hydraulic oil inside the cylinder sleeve 21 is recovered into the interior of the storage cylinder 41, without the need to connect additional hydraulic oil supply equipment;

[0088] 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.

[0089] 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.

[0090] It is worth mentioning that the above flipping method has the following advantages:

[0091] 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.

[0092] 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.

[0093] 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.

[0094] Advantage four, by slidingly setting 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 tube 41 begins to be discharged into the cylinder sleeve 21, and at the same time, the pushing component 56 relies on its own gravity to reset along the slide rail 25 toward the slide plate 57, so that the pushing component 56 drives the moving plug 3 to slide upward through the push rod 4, thereby automatically making room for the hydraulic oil discharge, and at the same time, negative pressure is generated when the moving plug 3 slides, which is conducive to the rapid discharge of the hydraulic oil inside the storage tube 41, so as to ensure that the hydraulic oil is discharged to the inside of the cylinder sleeve 21 before the sealing ball 48 is separated from the ball groove 410.

[0095] In practical applications, the push plate 51 reciprocates and drives the push rod 4 in the following manner:

[0096] The reciprocating drive of the moving plug 3 is realized by pushing the push rod 4 to reciprocate up and down through the push plate 51. 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, which is used 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, reducing the resistance between the vibration plate 8 and the fixed cylinder 23 and preventing wear. At the same time, the fixed disc 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, ensuring that the push rod 4 is always connected to the push plate 51 while ensuring the vibration state of the push rod 4.

[0097] 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 on 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 various embodiments of the present invention.

Claims

1. Hydraulic seal fatigue life test bench, including a test chamber (1), a hydraulic cylinder (2) is arranged in the test chamber (1), a moving plug (3) is slidably arranged in the hydraulic cylinder (2), and the hydraulic seal to be tested (100) is detachably arranged on one side of the moving plug (3) so as to test the fatigue life of the hydraulic seal (100) when the moving plug (3) moves in the hydraulic cylinder (2), characterized in that, The hydraulic cylinder (2) is rotatably arranged inside the test chamber (1); and the hydraulic cylinder (2) includes a cylinder liner (21) and a sealing cover (22) detachably configured on one side of the cylinder liner (21); One end of the moving plug (3) is connected to a push rod (4), and the end of the push rod (4) far from the moving plug (3) penetrates through the hydraulic cylinder (2); One side of the push rod (4) is connected to a reciprocating assembly (5). In the test state, the reciprocating assembly (5) drives the moving plug (3) to reciprocate in the hydraulic cylinder (2) through the push rod (4); in the assembled 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); It further includes a rotating assembly (6) for driving the hydraulic cylinder (2) to rotate relative to the test chamber (1); the rotating assembly (6) includes: A support arm (61) arranged on one side of the hydraulic cylinder (2); A fixed shaft (62) connected to one side of the support arm (61), the fixed shaft (62) rotatably penetrates through the test chamber (1), and a second driving member (63) for driving the hydraulic cylinder (2) to rotate is connected to one side of the fixed shaft (62).

2. The hydraulic seal fatigue life test bench according to claim 1, characterized in that One side of the sealing cover (22) is provided with a first pushing member (222), and the first pushing member (222) is used to push the sealing cover (22) to seal or move away from one side of the cylinder liner (21); The end of the first pushing member (222) far from the sealing cover (22) is rotatably connected to the fixed shaft (62).

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

4. The hydraulic seal fatigue life test bench according to claim 3, characterized in that, One end of the fixed cylinder (23) facing the cylinder liner (21) is provided with a communicating pipe (45), and the communicating pipe (45) communicates the cylinder liner (21) and the receiving cylinder (41); A sealing ball (48) is arranged at the communicating pipe (45). In the test state, the sealing ball (48) blocks the communicating pipe (45).

5. The hydraulic seal fatigue life test bench according to claim 4, characterized in that, One end of the communicating pipe (45) facing the receiving cylinder (41) is provided with a liquid outlet funnel (44); One end of the communicating pipe (45) far from the receiving cylinder (41) is provided with a liquid inlet funnel (46).

6. The hydraulic seal fatigue life test bench according to claim 4, characterized in that, A boss (49) is arranged at one end of the receiving cylinder (41) close to the push rod (4), and the boss (49) is arranged on the side wall of the receiving cylinder (41); A ball groove (410) for receiving the sealing ball (48) is formed inside the boss (49).

7. The hydraulic seal fatigue life test bench according to claim 1, characterized in that One side of the hydraulic cylinder (2) is provided with a side plate (24), and a support frame (29) is connected to one side of the side plate (24); The reciprocating assembly (5) includes: A push plate (51) connected to one side of the push rod (4), and the push plate (51) is slidably arranged in the support frame (29); The driving plate (55) is slidably arranged in the support frame (29), and the driving plate (55) is arranged on one side of the push plate (51). A driving wheel (54) is arranged between the driving plate (55) and the push plate (51) for transmission. The pushing assembly (56) is used to apply a reciprocating thrust to the driving plate (55), and the pushing assembly (56) is slidably arranged on one side of the side plate (24).

8. The hydraulic seal fatigue life test bench according to claim 7, characterized in that The pushing assembly (56) includes: The first driving member (562) is a motor arranged on one side of the side plate (24). A connecting rod (565) is connected to the output end of the first driving member (562). The connecting plate (566) is rotatably arranged on one side of the connecting rod (565). The connecting plate (566) is driven by the first driving member (562) to reciprocate up and down to drive the driving plate (55) to move.

9. The hydraulic seal fatigue life test bench according to claim 8, characterized in that A baffle (26) is fixedly arranged on one side of the side plate (24), and a sliding plate (57) is slidably arranged on one side of the side plate (24). The pushing assembly (56) further includes: A sliding rod (567) has one end slidably passing 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 outside the sliding rod (567) and is located between the connecting plate (566) and the driving plate (55). A pressure sensor (569) is arranged on one side of the driving plate (55), and one side of the elastic member (568) abuts against the pressure sensor (569). A sliding table (561) is slidably arranged between the side plates (24), and the first driving member (562) is fixedly arranged on one side of the sliding table (561). In the test state, the sliding table (561) is supported at the sliding plate (57). In the assembled state, the sliding table (561) is supported at the baffle (26). An adjusting member (58) is a screw rod arranged at the bottom end of the sliding plate (57) and is used to adjust the height of the sliding table (561) in the test state.

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