A high pressure pulse seal test test platform

Abstract

This application discloses a high-pressure pulse sealing test platform, relating to the field of rubber and plastic sealing pulse technology. The high-pressure pulse sealing test platform includes: a test fixture for supporting the seal to be tested; a pressurization system including a large oil tank assembly, the large oil tank assembly having a first pipeline connected to the oil inlet of the test fixture, the first pipeline having a large gear pump set, an accumulator, a servo valve, and a pressurization cylinder arranged sequentially along the direction close to the test fixture; and an oil replenishment system, where oil discharged from the oil outlet of the test fixture is filtered by the oil replenishment system and then delivered to the oil inlet of the test fixture; wherein the degree of leakage of the test fixture is characterized by the change in piston displacement of the pressurization cylinder.

Description

Technical Field

[0001] This application relates to the field of rubber and plastic sealing pulse technology, and in particular to a high-pressure pulse sealing test platform. Background Technology

[0002] In numerous industrial sectors, such as aerospace, petrochemicals, and automotive manufacturing, the performance of seals plays a crucial role in the normal operation, safety, and reliability of equipment. Among these, the sealing ring, as a key sealing element, directly affects the equipment's lifespan and maintenance costs through its continuous working capability and durability throughout its entire life cycle. Therefore, accurate and efficient performance testing of sealing rings, especially high-pressure pulse sealing tests simulating actual operating conditions, has become a vital step in ensuring the quality of seals and the performance of equipment. Summary of the Invention

[0003] The main objective of this application is to provide a high-pressure pulse sealing test platform, which aims to solve the technical problem in the prior art that the test of the sealing component cannot be automatically stopped based on the leakage amount.

[0004] To achieve the above objectives, this application provides a high-pressure pulse sealing test platform, comprising:

[0005] Test fixture, used to support the seal to be tested;

[0006] A booster system includes a large oil tank assembly, which is provided with a first pipeline connected to the oil inlet of the test fixture. The first pipeline is provided with a large gear pump set, an accumulator, a servo valve and a booster cylinder in sequence along the direction close to the test fixture.

[0007] The oil replenishment system filters the oil discharged from the oil outlet of the test fixture and then delivers it to the oil inlet of the test fixture.

[0008] The degree of leakage of the test fixture is characterized by the change in piston displacement of the booster cylinder.

[0009] Optionally, the test fixture includes a cylinder body, the cylinder body having a piston chamber, and the side wall of the cylinder body having an oil inlet and an oil outlet communicating with the piston chamber;

[0010] A piston rod is provided inside the piston chamber, and at least one of the seals to be tested is disposed between the outer wall of the piston rod and the inner wall of the piston chamber.

[0011] Optionally, the oil inlet and the oil outlet are coaxially arranged.

[0012] Optionally, the outer wall of the piston rod is provided with two receiving grooves for accommodating the seal to be tested, and the two receiving grooves are located on both sides of the area where the oil inlet and oil outlet are located;

[0013] Two support members are also provided between the outer wall of the piston rod and the inner wall of the piston chamber, and the two support members are located inside the two receiving grooves;

[0014] The cylinder body has oil leakage holes located outside the two receiving grooves.

[0015] Optionally, the system also includes a workbench arranged side-by-side with the pressurization system. The test fixture is mounted on the workbench, and the workbench is provided with a protective chamber that can move in a direction close to or away from the test fixture, so that the protective chamber can be selectively covered around the test fixture.

[0016] Optionally, the workbench is also provided with a lifting device, and at least one connector is provided between the lifting device and the protective chamber, so that the lifting device and the protective chamber form a limiting structure in a first direction through the connector;

[0017] The lifting device is equipped with a servo electric cylinder, and the telescopic end of the servo electric cylinder is connected to the protective cabin. The servo electric cylinder enables the protective cabin and the lifting device to move relative to each other in a second direction.

[0018] The workbench is provided with a slide rail extending in a first direction, and the lifting device is provided with a slider for cooperating with the slide rail.

[0019] Optionally, a heat exchanger is also provided on the first pipeline, and the heat exchanger is connected to a water chiller.

[0020] Optionally, the oil replenishment system includes a small oil tank assembly, which is provided with a second pipeline connected to the oil outlet of the test fixture and a third pipeline connected to the oil inlet of the test fixture. The second pipeline is provided with a return oil pneumatic control valve, and the third pipeline is provided with a small gear pump set and an inlet oil pneumatic control valve.

[0021] Optionally, filters are provided on the first, second, and third pipelines.

[0022] Optionally, it also includes an auxiliary measuring device, which includes temperature sensors disposed on the booster system and the oil replenishment system, and hydraulic pressure sensors disposed on the oil inlet and oil outlet of the test fixture.

[0023] The beneficial effects that this application can achieve are:

[0024] This application proposes a high-pressure pulse sealing test platform. Through a combination design of a large gear pump set, accumulator, servo valve, and booster cylinder, it can achieve stable and precisely controllable high-pressure pulse output, thereby simulating the pressure changes experienced by the seal under actual working conditions and applying cyclic waveform pulses to the seal under test. The oil replenishment system filters the oil discharged from the oil outlet of the test fixture and then returns it to the oil inlet, forming an oil recycling system. The leakage degree of the test fixture is characterized by monitoring the displacement change of the booster cylinder piston, allowing for intuitive and quantitative monitoring of the fixture's leakage status. This platform is suitable for testing the sealing performance and lifespan durability of seals. Furthermore, it can cooperate with an electrical control system; when the leakage reaches a certain level, the system automatically alarms and stops operating. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the overall shape of the test platform according to an embodiment of this application;

[0026] Figure 2 This is a cross-sectional structural diagram of the test fixture according to an embodiment of this application;

[0027] Figure 3 for Figure 1 The middle section is a partial structural diagram of the turbocharging system and the fuel replenishment system;

[0028] Figure 4 This is an enlarged structural diagram of the workbench in an embodiment of this application;

[0029] Figure 5 This is a schematic diagram illustrating the working principle of the booster system and the oil replenishment system in an embodiment of this application.

[0030] The numbers on the map are:

[0031] 10-Boosting system, 11-Large oil tank assembly, 12-Large gear pump set, 13-Accumulator, 14-Boosting cylinder, 20-Test fixture, 21-Cylinder body, 22-Piston rod, 23-Oil inlet, 24-Oil outlet, 25-Support component, 26-Seal to be tested, 27-Leakage hole, 30-Oil replenishment system, 31-Small oil tank assembly, 32-Small gear pump set, 40-Workbench, 50-Protective chamber, 51-Lifting device, 52-Servo electric cylinder, 53-Slide rail, 54-Slider, 60-Filter, 70-Servo valve, 71-Return oil pneumatic control valve, 72-Inlet oil pneumatic control valve, 80-Heat exchanger, 81-Water chiller, 90-Air compressor, 91-Sampling valve, 92-Solenoid valve, 93-Relief valve, 94-Pressure transmitter, 100-Electrical control cabinet.

[0032] The realization of the purpose, functional features and advantages of this application will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0033] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0034] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present invention are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indication will also change accordingly.

[0035] In this invention, unless otherwise explicitly specified and limited, the terms "connection," "fixed," etc., should be interpreted broadly. For example, "fixed" can mean a fixed connection, a detachable connection, or an integral part; it can mean a mechanical connection or an electrical connection; it can mean a direct connection or an indirect connection through an intermediate medium; it can mean the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0036] Furthermore, if the embodiments of this invention involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the meaning of "and / or" throughout the text includes three parallel solutions; for example, "A and / or B" includes solution A, solution B, or a solution where both A and B are satisfied simultaneously. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this invention.

[0037] Example 1

[0038] Reference Figures 1-5 , Figure 5 This is a schematic diagram illustrating the working principle of the booster system 10 and the oil replenishment system 30. Figure 5 P1, P2, P3, and P4 are all pressure transmitters 94.

[0039] The pressure transmitter 94 is a device that converts pressure signals into standard electrical signals (such as 4-20mA analog or digital signals) for control and remote transmission. The pressure transmitter 94 mainly consists of two parts: a pressure-sensitive element and a signal processing circuit. When the pressure of the measured medium is applied to the sensitive element of the pressure transmitter 94, the sensitive element undergoes a slight deformation. These deformations or physical changes are converted into an initial electrical signal. This signal is often weak and non-linear, therefore, the signal processing circuit is needed to amplify and linearize it to ensure that the signal can be correctly recognized by the external control system and converted into a standardized output signal, such as a 4-20mA analog or digital signal.

[0040] The servo valve 70 is a control element used to regulate hydraulic flow and pressure. It belongs to the category of proportional control valves and continuously detects the difference between the output and input signals through a sensing element to adjust and control the flow. During system operation, the servo valve 70 directly receives the electrical signal transmitted from the system, converting it into a proportional signal with corresponding polarity that can control the load flow or load pressure. This allows the system to output greater hydraulic power, driving the corresponding actuator.

[0041] Accumulator 13 is an energy storage device in a hydraulic and pneumatic system. It converts the energy in the system into compressed energy or potential energy at appropriate times and stores it. When the system needs it, it converts the compressed energy or potential energy into hydraulic or pneumatic energy and releases it to replenish the system.

[0042] The first embodiment of this application provides a high-pressure pulse sealing test platform, including: a test fixture 20 for carrying the seal 26 to be tested; a pressurization system 10, including a large oil tank assembly 11, the large oil tank assembly 11 being provided with a first pipeline connected to the oil inlet end of the test fixture 20, the first pipeline being sequentially provided with a large gear pump group 12, an accumulator 13, a servo valve 70 and a pressurization cylinder 14 along the direction close to the test fixture 20; and an oil replenishment system 30, the oil discharged from the oil outlet end of the test fixture 20 is filtered by the oil replenishment system 30 and then transported to the oil inlet end of the test fixture 20; wherein, the leakage degree of the test fixture 20 is characterized by the change in piston displacement of the pressurization cylinder 14.

[0043] In this embodiment, the test fixture 20 is used to install the seal 26 to be tested. The test fixture 20 has an oil inlet and an oil outlet. When the seal 26 is within its service life, it can perform a sealing function, and oil enters the test fixture 20 from the oil inlet and is then discharged through the oil outlet. However, when the sealing performance of the seal 26 deteriorates, oil leakage occurs. The pressurization system 10 is connected to the oil inlet on the test fixture 20, and there is a direct correlation between the piston displacement of the pressurization cylinder 14 and the system pressure. The greater the change in piston displacement of the pressurization cylinder 14, the greater the degree of leakage in the test fixture 20.

[0044] The servo valve 70 and booster cylinder 14 in the booster system 10 achieve an output pulse pressure that satisfies the alternating pulse pressure waveform, superimposing a regularly changing alternating pressure source on the target test pressure. The alternating pressure controls the drive end of the booster cylinder 14 through the servo valve 70, outputting a proportional pulse pressure. The pulse pressure waveform is formed by the function generator of the controller. During the test, the pulse waveform data is monitored, recorded, and stored by the hydraulic pressure sensor installed at the oil outlet of the test fixture 20 and the test software.

[0045] Under ideal, leak-free conditions, when a high-pressure pulse is applied to the test fixture 20, the piston displacement should be determined solely by the input pressure signal and the mechanical characteristics of the booster cylinder 14. In this case, the piston displacement will change according to a preset pattern to maintain stable system pressure. However, during prolonged testing, the sealing performance of the tested seal 26 may decrease. When leakage occurs in the test fixture 20, some high-pressure oil will leak from the seal, causing the system pressure to fail to maintain the expected value. This pressure loss will be directly reflected in the piston displacement of the booster cylinder 14.

[0046] The displacement change of the piston in the booster cylinder 14 is monitored in real time by a displacement sensor. The displacement sensor can accurately capture the minute displacement of the piston and convert it into an electrical signal for transmission and processing. The real-time monitored piston displacement change is compared with the displacement change under a preset leak-free state. If there is a significant difference between the actual displacement change and the preset value, it can be preliminarily determined that there is a leak in the test fixture 20. Then, by considering the amount of leakage and the test time, the sealing performance and lifespan of the seal 26 under test can be obtained. The oil is circulated through the oil replenishment system 30. The hydraulic pressure in the cylinder 21 is kept stable by the valve group in the booster system 10 and the oil replenishment system 30, so that the cylinder 21 generates a waveform pulse for the seal 26 under test while maintaining the target hydraulic pressure. The oil inlet and outlet of the test fixture 20 are connected to hydraulic pressure sensors. The waveform pulse curve experienced by the test piece is generated by the real-time calculation and recording of the test software. Meanwhile, during the test, a long-term hydraulic pulse is continuously output to the inside of the cylinder 21. The sealing performance and lifespan of the seal 26 under test are obtained by collecting the oil volume at the oil leakage hole 27 of the test fixture 20 and the total test time.

[0047] Example 2

[0048] like Figure 2As shown, based on Embodiment 1, this embodiment provides a specific structure of a test fixture 20. The test fixture 20 includes a cylinder 21, which has a piston chamber. The side wall of the cylinder 21 is provided with an oil inlet hole 23 and an oil outlet hole 24 communicating with the piston chamber. A piston rod 22 is provided inside the piston chamber, and at least one seal 26 to be tested is provided between the outer wall of the piston rod 22 and the inner wall of the piston chamber.

[0049] Specifically, the cylinder body 21 has a piston chamber extending laterally. A piston rod 22 is disposed within the piston chamber and can move left and right along it. The outer dimensions of the piston rod 22 are adapted to the inner wall dimensions of the piston chamber, and there is a certain gap between the outer wall of the piston rod 22 and the inner wall of the piston chamber. Dust covers are provided at the left and right ends of the cylinder body 21. Static seals are provided between the dust covers and the side walls of the left and right ends of the cylinder body 21. The right end of the piston rod 22 passes through the right-end dust cover. When the seal 26 to be tested needs to be replaced, the dust cover can be opened first to replace the seal. The right-end dust cover has a through hole through which the piston rod 22 passes. A non-contact reciprocating seal is provided between the inner wall of the through hole and the piston rod 22. The seal 26 to be tested is disposed between the outer wall of the piston rod 22 and the inner wall of the piston chamber, and the seal 26 to be tested has an annular structure. It should be noted that the oil inlet end of the test fixture 20 can be part of the oil inlet hole 23, or the oil inlet end of the test fixture 20 can be a connecting pipe set outward from the oil inlet hole 23, and the oil outlet end is the same.

[0050] Optionally, the oil inlet hole 23 and the oil outlet hole 24 are coaxially arranged.

[0051] Specifically, by setting the oil inlet hole 23 and the oil outlet hole 24 to coincide on the axis, the test seal 26 located on both sides of the oil inlet hole 23 and the oil outlet hole 24 is subjected to the same force as much as possible, thereby reducing the situation of uneven force on the test seal 26 on both sides and improving the test accuracy.

[0052] Optionally, the outer wall of the piston rod 22 is provided with two receiving grooves for accommodating the seal 26 to be tested. The two receiving grooves are located on both sides of the area where the oil inlet hole 23 and the oil outlet hole 24 are located. Two support members 25 are also provided between the outer wall of the piston rod 22 and the inner wall of the piston chamber. The two support members 25 are located inside the two receiving grooves. The cylinder body 21 has an oil leakage hole 27 located outside the two receiving grooves.

[0053] Specifically, a support member 25 is used between the piston rod 22 and the inner wall of the piston chamber to prevent the piston rod 22 from shifting or swinging, reduce wear, and improve the stability of the piston rod 22. The support member 25 is in active contact with the inner wall of the cylinder 21. The two seals to be tested 26 are located on both sides of the area where the oil outlet 24 and the oil inlet 23 are located. A space is formed between the two seals to be tested 26 to accommodate the oil entering the test fixture 20 from the booster system 10 and the oil replenishment system 30. It should be noted that if the piston rod 22 needs to move back and forth, the two seals to be tested will not cross the positions of the oil inlet 23 and the oil outlet 24 during the reciprocating movement of the piston rod 22, so as to ensure that the oil enters the piston chamber from the oil inlet 23 and exits the piston chamber through the oil outlet 24. When the sealing performance of the two tested seals 26 is good, the oil will not leak to the outside of the two tested seals 26. During continuous testing, the sealing performance of the two tested seals 26 decreases, and the oil leaks from the two tested seals 26. That is, the oil passes over the left tested seal 26 and enters the left drain hole, and the oil passes over the right tested seal 26 and enters the right drain hole. By collecting the oil in the two drain holes and by measuring the volume of the leaked oil and the total test time, the sealing performance and lifespan of the tested seals 26 can be obtained. It can be used to test the service life and sealing performance of the tested seals 26. It should be noted that the oil leakage holes 27 can be set on the sealing caps at both ends. The two oil leakage holes 27 extend downward so that the oil in the oil leakage holes 27 can move downward under the action of gravity and be discharged to the outside of the oil leakage holes 27 for collection.

[0054] Example 3

[0055] like Figure 1 and Figure 4 As shown, based on Embodiment 1, this embodiment provides a specific structure of a workbench 40. The workbench 40 and the pressurization system 10 are arranged side by side. The test fixture 20 is arranged on the workbench 40. The workbench 40 is provided with a protective chamber 50 that can move in the direction of approaching or moving away from the test fixture 20, so that the protective chamber 50 can be selectively covered to the periphery of the test fixture 20.

[0056] Specifically, the test fixture 20 is positioned at its left end, and its position remains unchanged throughout the test. A protective chamber 50 is also installed on the workbench 40. The protective chamber 50 can move left and right. When it moves to the left end, it covers the test fixture 20, protecting it from splashing of leaked oil. A transparent explosion-proof window is provided on the protective chamber 50 for easy observation of the test. When it moves to the right end, it is positioned side-by-side with the test fixture 20, facilitating the replacement of the tested seal 26. The left side of the protective chamber 50 is open to allow the test fixture 20 to enter and exit relative to the chamber during its movement. The oil inlet and outlet pipes of the test fixture 20 can also be connected to the pressurization system 10 and the oil replenishment system 30 through the left side of the protective chamber 50.

[0057] Optionally, the worktable 40 is also provided with a lifting device 51, and at least one connector is provided between the lifting device 51 and the protective chamber 50, so that the lifting device 51 and the protective chamber 50 form a limiting structure in the first direction through the connector; the lifting device 51 is provided with a servo electric cylinder 52, and the telescopic end of the servo electric cylinder 52 is connected to the protective chamber 50, so that the protective chamber 50 and the lifting device 51 can move relative to each other in the second direction through the servo electric cylinder 52; the worktable 40 is provided with a slide rail 53 extending along the first direction, and the lifting device 51 is provided with a slider 54 for cooperating with the slide rail 53.

[0058] Specifically, Figure 4 X represents the first direction, which is the left-right direction. Y represents the second direction, which is the vertical direction. Figure 4 The frame structure set around the protective cabin 50 is a lifting device 51. At least one connector is provided between the lifting device 51 and the protective cabin 50. The purpose of providing the connector is to enable the protective cabin 50 to move synchronously left and right when the lifting device 51 moves left and right, without affecting the lifting and lowering movement of the protective cabin 50.

[0059] The connector may include a guide rail and a guide block. The guide rail is mounted on the lifting device 51, and its extension direction is the second direction. The guide block is mounted on the protective chamber 50 and is used to cooperate with the guide rail. The guide block can move along the guide rail, and its cross-sectional shape can be dovetail-shaped or T-shaped to ensure that the guide block can move along the guide rail and will not disengage from the guide rail. Similarly, the connector may also include baffles on both sides of the lifting device 51 along the first direction. The two baffles form a limiting structure with the lifting device 51. That is, when the lifting device 51 moves along the first direction, the lifting device 51 can drive the protective chamber 50 to move through the baffles. When the protective chamber 50 moves along the second direction, the baffles will not obstruct the movement of the protective chamber 50, so that the lifting device 51 and the protective chamber 50 can move relative to each other. It should be noted that the lifting device 51 can move along the first direction by manual pushing or pulling, or by setting a hydraulic cylinder or air cylinder on the workbench 40. The extension and retraction ends of the hydraulic cylinder or air cylinder are connected to the lifting device 51. The extension and retraction of the extension shaft of the hydraulic cylinder or air cylinder can realize the pushing and pulling action of the lifting device 51.

[0060] By installing a servo electric cylinder 52 on the lifting device 51, with its telescopic shaft connected to the upper end of the protective chamber 50, when the servo electric cylinder 52 drives the telescopic end to move downward, it applies downward pressure to the protective chamber 50, causing the protective chamber 50 to press against the worktable 40, thus preventing the protective chamber 50 from moving arbitrarily. Simultaneously, the lifting device 51 experiences a certain upward reaction force, increasing the static friction between the slider 54 and the slide rail 53 on the lifting device 51, thus providing auxiliary fixation and preventing the lifting device 51 from moving arbitrarily left or right. This ensures that during the test, the protective chamber 50 remains outside the testing area, protecting the testing fixture 20 from oil mist spraying out in the event of pipe rupture or other accidents.

[0061] Example 4

[0062] Based on Example 1, this example provides a specific structure of a test platform, including: a heat exchanger 80 is also provided on the first pipeline, and the heat exchanger 80 is connected to a water chiller 81.

[0063] Specifically, the heat exchanger 80 and the water chiller 81 are installed on the first pipeline that delivers oil to the cylinder 21. When the oil is delivered through the first pair of pipelines, the heat exchanger 80 first exchanges heat with the oil, thereby controlling the temperature of the oil entering the cylinder 21 to cool the cylinder 21 without the need for a separate cooling device. An overflow valve 93 is also installed on the first pipeline.

[0064] Optionally, the oil replenishment system 30 includes a small oil tank assembly 31. The small oil tank assembly 31 is provided with a second pipeline connected to the oil outlet end of the test fixture 20 and a third pipeline connected to the oil inlet end of the test fixture 20. The second pipeline is provided with a return oil pneumatic control valve 71, and the third pipeline is provided with a small gear pump set 32 ​​and an inlet oil pneumatic control valve 72.

[0065] Specifically, the pipeline is opened and closed via the return oil pneumatic control valve 71 and the inlet oil pneumatic control valve 72. An air compressor 90 is connected to both the return oil pneumatic control valve 71 and the inlet oil pneumatic control valve 72. A dual-unit is installed at the outlet of the air compressor 90, connecting two branches. These branches are respectively connected to the return oil pneumatic control valve 71 and the inlet oil pneumatic control valve 72. Solenoid valves 92 are installed on both branches to control the return oil pneumatic control valve 71 and the inlet oil pneumatic control valve 72. A sampling valve 91 is also installed on the second pipeline to sample the oil within it. The oil in the small oil tank assembly 31 is transported to the test fixture 20 via a small gear pump assembly 32. Both the large oil tank assembly 11 and the small oil tank assembly 31 can be equipped with injection pipelines for injecting oil. Furthermore, a connecting pipe can be installed between the large oil tank assembly 11 and the small oil tank assembly 31, allowing oil from the small oil tank assembly 31 to be transported to the large oil tank assembly 11. The booster system 10 and the oil replenishment system 30, through an oil supply pipe located at the oil inlet 23 below the middle of the test fixture 20 and an oil outlet 24 above the middle of the test fixture 20, form a waveform pulse booster and oil self-circulation within the cylinder 21, providing waveform pulse pressure impact and cooling to the cylinder 21.

[0066] Optionally, filters 60 are installed on the first, second, and third pipelines.

[0067] Specifically, by setting up filter 60, impurities in the oil can be filtered out, ensuring that the oil can be used normally.

[0068] Optionally, it also includes auxiliary measuring devices, including temperature sensors installed in the booster system 10 and the oil replenishment system 30, and hydraulic pressure sensors installed at the oil inlet and oil outlet of the test fixture 20.

[0069] Specifically, by setting temperature sensors and hydraulic pressure sensors, it is possible to monitor the oil temperature in the booster system 10 and the oil replenishment system 30, as well as the pressure changes in the cylinder block 21 in real time.

[0070] The high-voltage pulse sealing test platform in this embodiment also includes an electrical control cabinet 100. The electrical control cabinet 100 includes an operating console, an electrical control cabinet, etc. The electrical control cabinet includes circuit breakers, contactors, PLCs, relays, digital quantity modules, analog quantity modules, etc., integrated on an electrical mounting plate and connected to the central control computer. It is connected to the booster system 10, the oil replenishment system 30 and the servo electric cylinder 52 through electrical lines. The operating console is electrically connected to the electrical control cabinet and acts as a host computer to remotely control the entire test platform, record data, perform safety interlock protection and equipment status monitoring, etc.

[0071] The system implements logical control of the entire testing platform via a host computer control cabinet, featuring signal acquisition, valve control, pressure protection, and other safety protection functions. It also includes equipment status display, test parameter adjustment, and command input. The electrical control system's host computer is located on the control panel. Through the cooperation of testing software, PLC, digital input modules, and other electrical components, it achieves functions such as switching control of hydraulic components, pulse pressure waveform control, test parameter adjustment, and automatic test completion / stop.

[0072] The usage process of the high-pressure pulse sealing test platform in this embodiment is as follows:

[0073] During the test, the small gear pump unit 32 is first started, and oil is supplied to the cylinder 21 through the oil inlet 23 at the bottom of the cylinder 21 via the oil inlet control valve 72. Then, the large gear pump unit 12 pressurizes the rod body of the test fixture 20 through the servo valve 70 and the booster cylinder 14. The hydraulic pressure in the cylinder 21 is kept stable by the pressure transmitter 94 and the return oil control valve 71. The required pressure in the cylinder 21 can be maintained by adjusting the set value of the pressure transmitter 94. When the hydraulic pressure sensor reading is stable, the servo valve 70 and the booster cylinder 14 input alternating pulse pressure into the cylinder 21 of the test fixture 20 through the oil inlet control valve 72 according to the set target value. At the same time, the hydraulic pressure sensor feeds back the real-time hydraulic pressure in the cylinder 21 to the central control computer, and the corresponding hydraulic pulse curve is generated in the test software on the operating table. The water cooler 81, which is connected in parallel with the heat exchanger 80 in the oil self-circulation, is started, and the entire cylinder 21 is cooled down by controlling the temperature of the oil entering the cylinder 21.

[0074] During the long-term test, the sealing performance of the seal 26 under test decreased. When the test fixture 20 leaks, some high-pressure oil will leak out from the seal, causing the system pressure to fail to maintain the expected value. This pressure loss will be directly reflected in the piston displacement of the booster cylinder 14.

[0075] The displacement of the piston in the booster cylinder 14 is monitored in real time by a displacement sensor. When the displacement of the piston reaches a preset threshold set by the user, the test is stopped and an alarm message is issued.

[0076] During the continuous high-pressure pulse test of cylinder 21, the oil at the oil leakage hole 27 is continuously collected. By measuring the volume of the collected leaking oil and the test run time, the sealing performance and service life of the seal 26 under test can be obtained.

[0077] The above are merely preferred embodiments of this application and do not limit the patent scope of this application. Any equivalent structural or procedural transformations made using the content of this application's specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this application.

Claims

1. A high-pressure pulse sealing test platform, characterized in that, include: Test fixture, used to support the seal to be tested; A booster system includes a large oil tank assembly, which is provided with a first pipeline connected to the oil inlet of the test fixture. The first pipeline is provided with a large gear pump set, an accumulator, a servo valve and a booster cylinder in sequence along the direction close to the test fixture. The oil replenishment system filters the oil discharged from the oil outlet of the test fixture and then delivers it to the oil inlet of the test fixture. The degree of leakage of the test fixture is characterized by the change in piston displacement of the booster cylinder. It also includes a workbench, which is arranged side by side with the pressurization system. The test fixture is arranged on the workbench, and the workbench is provided with a protective chamber that can move in the direction of approaching or moving away from the test fixture, so that the protective chamber can be selectively covered to the periphery of the test fixture. The workbench is also equipped with a lifting device, and at least one connector is provided between the lifting device and the protective chamber, so that the lifting device and the protective chamber form a limiting structure in the first direction through the connector; The lifting device is equipped with a servo electric cylinder, and the telescopic end of the servo electric cylinder is connected to the protective cabin. The servo electric cylinder enables the protective cabin and the lifting device to move relative to each other in a second direction. The workbench is provided with a slide rail extending in a first direction, and the lifting device is provided with a slider for cooperating with the slide rail.

2. The high-pressure pulse sealing test platform as described in claim 1, characterized in that, The test fixture includes a cylinder body, which has a piston chamber, and the side wall of the cylinder body is provided with an oil inlet and an oil outlet that communicate with the piston chamber. A piston rod is provided inside the piston chamber, and at least one of the seals to be tested is disposed between the outer wall of the piston rod and the inner wall of the piston chamber.

3. The high-pressure pulse sealing test platform as described in claim 2, characterized in that, The oil inlet and the oil outlet are coaxially arranged.

4. The high-pressure pulse sealing test platform as described in claim 2, characterized in that, The outer wall of the piston rod is provided with two receiving grooves for accommodating the seal to be tested, and the two receiving grooves are located on both sides of the area where the oil inlet and oil outlet are located; Two support members are also provided between the outer wall of the piston rod and the inner wall of the piston chamber, and the two support members are located inside the two receiving grooves; The cylinder body has oil leakage holes located outside the two receiving grooves.

5. The high-pressure pulse sealing test platform as described in claim 1, characterized in that, A heat exchanger is also installed on the first pipeline, and the heat exchanger is connected to a water chiller.

6. The high-pressure pulse sealing test platform as described in claim 1, characterized in that, The oil replenishment system includes a small oil tank assembly. The small oil tank assembly is provided with a second pipeline connected to the oil outlet end of the test fixture and a third pipeline connected to the oil inlet end of the test fixture. A return oil pneumatic control valve is provided on the second pipeline, and a small gear pump set and an inlet pneumatic control valve are provided on the third pipeline.

7. The high-pressure pulse sealing test platform as described in claim 6, characterized in that, Filters are installed on the first, second, and third pipelines.

8. The high-pressure pulse sealing test platform as described in claim 1, characterized in that, It also includes an auxiliary measuring device, which includes temperature sensors installed in the booster system and the oil replenishment system, and hydraulic pressure sensors installed at the oil inlet and oil outlet of the test fixture.

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