Device for testing sealing performance of valve body of oil pressure mechanism

Abstract

The utility model provides an oil pressure mechanism valve body sealing performance testing device, and belongs to the technical field of fluid sealing performance testing of structural components. The testing device comprises an oil pump and an energy storage device, an oil inlet of the oil pump is communicated with an oil tank, an oil outlet of the oil pump is communicated with an oil inlet of the energy storage device through an energy storage oil way, the energy storage oil way is connected with a detection oil way, and the tail end of the detection oil way is communicated with an oil inlet of a valve body to be tested. More than two detection oil paths are arranged in parallel, each detection oil path is provided with a leak detection valve, each detection oil path is provided with a pressure detection device and / or each oil return pipe is provided with a leak detection interface or connected with a leak detection pipe, and the leak detection interface or the leak detection pipe is provided with a leak detection valve. According to the utility model, simultaneous detection of a plurality of to-be-detected valve bodies can be realized, detection oil paths do not influence each other, whether each to-be-detected valve body leaks oil or not can be independently judged, the detection efficiency is improved, the influence of other parts which may leak oil in the device can be avoided, and the detection accuracy is improved.

Description

Technical Field

[0001] This utility model relates to a hydraulic mechanism valve body sealing performance testing device, belonging to the technical field of fluid sealing performance testing of structural components. Background Technology

[0002] A hydraulic operating mechanism is a mechanism that controls switching equipment to perform opening and closing operations. Because it uses hydraulic oil as its power source, it can also be called a hydraulic mechanism. Hydraulic mechanisms contain various valve bodies, such as primary valves, secondary valves, and pressure switches. These valve bodies share the common feature of having internal oil passages and sealing components to block certain oil ports. These sealing components can be the valve stem itself or a steel ball pressed down by the valve stem. The sealing effect of the sealing components directly affects the valve body's sealing performance. If the sealing effect is not ideal, the oil will not be effectively shut off and will flow out through the return port, commonly known as "oil leakage." This will affect the normal function of the valve body. Therefore, during the assembly and debugging of hydraulic mechanisms, it is necessary to test the sealing performance of each valve body to ensure that the valve body does not leak oil.

[0003] Chinese invention patent application CN108443131A discloses a test device and test method for hydraulic operating mechanism components. The test device includes a valve block, which is provided with an oil tank inlet, an oil tank return port, an accumulator inlet, an oil pressure gauge connection port, a safety valve inlet, a safety valve return port, an oil pump inlet, and an oil pump outlet. The oil tank inlet is connected to the oil tank through an inlet pipe, the oil tank return port is connected to the oil tank through a return pipe, the accumulator inlet is connected to the accumulator, the oil pressure gauge connection port is connected to the oil pressure gauge, the safety valve inlet and return port are connected to the safety valve, and the oil pump inlet and outlet are connected to the oil pump. The valve block is equipped with an oil extraction channel connecting the oil tank inlet and the oil pump inlet, an energy storage channel connecting the oil pump outlet and the accumulator inlet, a return oil channel connecting the energy storage channel and the oil tank return port, and a safety channel connecting the energy storage channel and the safety valve inlet (the safety channel is the detection oil circuit corresponding to the safety valve, and the safety valve inlet is connected to the end of the detection oil circuit). A pressure relief valve is installed on the return oil channel, and the safety valve return port is connected to the return oil channel.

[0004] The aforementioned oil pump and safety valve are the components under test and are connected in series. During testing, the oil pump is driven by a motor to draw low-pressure oil from the tank into the energy storage channel through the oil extraction channel. The oil enters the energy storage device and compresses the nitrogen gas inside, causing the oil pressure to rise continuously. The oil pressure value can be directly read using an oil pressure gauge. During the pressurization process, the duration of the pressurization time can be used to determine whether the oil pump's pressurization characteristics are qualified. When the oil pressure reaches 32 MPa, the motor stops working, and the valve block is left to stand for 12 hours. The pressure difference before and after 12 hours is used to determine whether the oil pump and safety valve are leaking. After the test, the pressure relief valve is opened, and the oil in the energy storage channel flows back to the tank.

[0005] The aforementioned testing apparatus can also be used to test the sealing performance of various valve bodies in hydraulic mechanisms. However, due to the configuration of the apparatus, different valve bodies are connected in series. If tested simultaneously, it is difficult to determine which valve body is leaking once the pressure gauge reading drops. Therefore, individual testing is necessary, which significantly impacts testing efficiency. Furthermore, even testing only one valve body at a time introduces errors, as other components in the apparatus, such as the oil pump and accumulator, may also leak. Additionally, hydraulic oil pressure is affected by ambient temperature. Significant temperature differences within 12 hours can lead to noticeable pressure changes on the gauge. If the change is solely due to temperature, misjudgments are easily made. Utility Model Content

[0006] The purpose of this utility model is to provide a hydraulic mechanism valve body sealing test device to solve the problems of existing test devices being unable to determine which valve body is leaking when testing multiple valve bodies at the same time, and having low testing efficiency and other components that may also be leaking components when testing each valve body individually, resulting in testing errors.

[0007] To achieve the above objectives, the hydraulic mechanism valve body sealing test device of this utility model adopts the following technical solution:

[0008] A hydraulic valve body sealing test device includes an oil pump and an accumulator. The oil pump inlet is connected to an oil tank, and the oil pump outlet is connected to the accumulator inlet via an accumulator oil circuit. The accumulator oil circuit is connected to a detection oil circuit, the end of which is connected to the inlet of the valve body under test. The test device also includes a return oil pipe with one end connected to the return oil port of the valve body under test and the other end connected to the oil tank. Two or more detection oil circuits are connected in parallel, and each detection oil circuit is equipped with a leak detection valve. The return oil pipe corresponds to each detection oil circuit. Each detection oil circuit has a pressure detection device downstream of the leak detection valve, and / or each return oil pipe has a leak detection interface or is connected to a leak detection pipe. Each leak detection interface or leak detection pipe is equipped with a leak detection valve.

[0009] The beneficial effects of the above technical solution are as follows: This utility model is an improved invention. The improved detection oil circuit has two or more parallel configurations, so each detection oil circuit can be connected to a valve body under test. Each detection oil circuit is equipped with a leak detection valve. After the pressure value of the energy storage oil circuit rises to the set value, the leak detection valve can be closed, thereby isolating the detection oil circuit, eliminating the influence of other possible leaking components, and improving the detection accuracy. At the same time, the return oil pipe corresponds one-to-one with the detection oil circuit. Each detection oil circuit is equipped with a pressure detection device downstream of the leak detection valve, and / or each return oil pipe is equipped with a leak detection interface or connected to a leak detection pipe. Each leak detection interface or leak detection pipe is equipped with a leak detection valve. In this way, the change in the detection result by the pressure detection device can determine whether the valve body under test connected to the corresponding detection oil circuit is leaking oil, and / or after the pressure rise is completed and the leak detection valve is closed, the leak detection valve is opened. If there is a defect in the sealing of the valve body under test, the oil will flow out through the return oil pipe and the leak detection valve. By observation, it can be determined whether the valve body under test is leaking oil.

[0010] In summary, this invention enables simultaneous detection of multiple valve bodies under test, with each detection oil circuit operating independently. It can independently determine whether each valve body under test is leaking oil, thereby improving detection efficiency. Furthermore, it can avoid the influence of other potentially leaking components in the device, thus improving detection accuracy.

[0011] Furthermore, the test device also includes a test base corresponding to each test oil circuit. Each test base is provided with a fixing hole for fixing the valve body to be tested. Each test base is also provided with a first interface that is connected to the corresponding test oil circuit and is used to connect with the oil inlet of the valve body to be tested, and a second interface that is used to connect with the oil return port of the valve body to be tested. Each oil return pipe is connected to the corresponding test base and is connected to the second interface.

[0012] Furthermore, each return oil pipe is equipped with the aforementioned leak detection interface or is connected to the aforementioned leak detection pipe, with the leak detection interface or leak detection pipe located near the end of the return oil pipe that is connected to the return oil port of the valve body to be tested.

[0013] Furthermore, the beginnings of each detection oil circuit converge and are connected to the energy storage oil circuit through the main oil inlet circuit.

[0014] Furthermore, the test apparatus also includes a safety valve, the oil inlet of which is connected to the main oil inlet, and the oil return port of which is used to connect to the oil tank.

[0015] Furthermore, the test apparatus also includes a pressure relief valve, the oil inlet of which and the oil inlet of which are connected to the main oil inlet through the same pressure relief oil inlet circuit, and the oil return port of which are connected to the oil tank through the same pressure relief oil return circuit.

[0016] Furthermore, the various return oil pipes converge into a main return oil circuit for connecting the oil tank.

[0017] Furthermore, the test apparatus includes an oil supply module, an oil pump mounted on the oil supply module, and an oil pressure gauge also mounted on the oil supply module.

[0018] Furthermore, each detection oil line is equipped with the aforementioned pressure detection device, and each pressure detection device is a pressure gauge.

[0019] Furthermore, the test apparatus also includes an oil tank, which is equipped with a low oil pressure alarm. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the composition principle of the hydraulic mechanism valve body sealing test device of this utility model (the black area in the figure represents high-pressure oil, and the remaining filled area represents low-pressure oil).

[0021] In the diagram: 1. Oil tank; 2. Oil supply module; 3. Oil pump; 4. Energy storage device; 5. Energy storage oil circuit; 6. Detection oil circuit; 7. Leak detection valve; 8. Pressure gauge; 9. Detection base; 9-1. First interface; 9-2. Second interface; 10. Return oil pipe; 11. Leak detection interface; 12. Leak detection valve; 13. Main return oil circuit; 14. Main inlet oil circuit; 15. Safety valve; 16. Pressure relief valve; 17. Pressure relief inlet oil circuit; 18. Pressure relief return oil circuit; 19. Filter screen; 20. Oil pressure gauge; 21. Low oil pressure alarm; 22. Oil inlet pipe. Detailed Implementation

[0022] To address the technical problems existing in the prior art, the basic concept of this utility model is to set up multiple parallel detection oil circuits, and each detection oil circuit is equipped with a leak detection valve. After the pressure is increased, the leak detection valve is closed, so that each detection oil circuit can detect independently, and can simultaneously and accurately determine whether each valve body under test is leaking oil, thereby improving detection efficiency.

[0023] The features and performance of this utility model will be further described in detail below with reference to the embodiments.

[0024] Example 1 of the hydraulic mechanism valve body sealing test device (hereinafter referred to as the test device) of this utility model:

[0025] like Figure 1 As shown, the test apparatus includes an oil tank 1, an oil supply module 2, and an energy storage device 4. The oil supply module 2 is equipped with two oil pumps 3. The oil supply module 2 has an oil inlet channel communicating with the oil inlets of the two oil pumps 3, and an oil chamber communicating with the oil outlets of the two oil pumps 3. The oil inlet channel of the oil supply module 2 is connected to the bottom of the oil tank 1 via an oil inlet pipe 22, thus connecting the oil inlets of the oil pumps 3 to the oil tank 1. A filter screen 19 is installed at the bottom of the oil tank 1, and a low oil pressure alarm 21 is installed inside the oil tank 1.

[0026] The oil supply module 2 has an oil outlet connected to the oil chamber. The oil outlet is connected to the oil inlet of the accumulator 4 via an energy storage oil passage 5. When the oil pump 3 operates, it draws low-pressure oil from the oil tank 1 into the oil chamber of the oil supply module 2. The oil then enters the accumulator 4 through the energy storage oil passage 5, compressing the nitrogen gas inside. The reaction force generated by the nitrogen gas increases the oil pressure, thus filling the energy storage oil passage 5 and the oil chamber of the oil supply module 2 with high-pressure oil. An oil pressure gauge 20 is installed on the oil supply module 2. The oil pressure gauge 20 can detect the oil pressure value in the oil chamber and on the energy storage oil passage 5, which can be directly obtained through observation. When the oil pressure reaches a set value, such as 32 MPa, the oil pump 3 is controlled to stop operating.

[0027] The energy storage oil circuit 5 is connected to the detection oil circuit 6. There are two or more detection oil circuits 6 connected in parallel; in this embodiment, there are three. The end of each detection oil circuit 6 is connected to the oil inlet of a valve body under test, thus enabling simultaneous testing of three valve bodies (such as a primary valve, a secondary valve, and a pressure switch). Each detection oil circuit 6 is equipped with a leak detection valve 7. During the pressurization process of the energy storage oil circuit 5, the leak detection valve 7 is open to allow the detection oil circuit 6 to be filled with high-pressure oil. When the oil pressure reaches 32 MPa and the oil pump 3 stops working, the leak detection valve 7 is closed, thereby isolating the detection oil circuit 6, eliminating the influence of other potentially leaking components, and improving the accuracy of the detection.

[0028] The testing apparatus also includes testing bases 9 corresponding to the testing oil circuits 6, with the ends of the testing oil circuits 6 connected to the corresponding testing bases 9. Each testing base 9 is provided with a first interface 9-1 connected to the corresponding testing oil circuit 6 and used to connect with the oil inlet of the valve body under test, and a second interface 9-2 used to connect with the oil return port of the valve body under test. The testing apparatus also includes return oil pipes 10 corresponding to the testing bases 9 and the testing oil circuits 6, with each return oil pipe 10 connected to the corresponding testing base 9. One end of the return oil pipe 10 is connected to the second interface 9-2, thereby achieving connection with the oil return port of the valve body under test through the testing base 9. All return oil pipes 10 converge into a main return oil circuit 13 for connecting to the oil tank 1, so that low-pressure oil can flow back to the oil tank 1. Each testing base 9 is provided with a fixing hole for fixing the valve body to be tested. When installing the valve body to be tested, you only need to fix the valve body to be tested onto the testing base 9 and connect the oil inlet and oil return port of the valve body to the corresponding interface. The connection between oil circuits is achieved through the testing base 9. There is no need to connect the valve body to the oil circuit or pipeline, making the installation more convenient.

[0029] Each oil detection circuit 6 is equipped with a pressure detection device downstream of the leak detection valve 7. In this embodiment, each pressure detection device is a pressure gauge 8, which facilitates direct observation of the oil pressure in the oil detection circuit 6. During the test, after the pressurization process ends and the leak detection valve 7 is closed, the circuit is left to stand for a period of time. Based on the pressure difference measured by the pressure gauge 8, it can be determined whether the valve body under test is leaking oil.

[0030] Of course, since the oil pressure will change due to the influence of ambient temperature, in order to avoid misjudgment, each return oil pipe 10 is provided with a leak test port 11, and each leak test port 11 is equipped with a leak test valve 12. During the pressurization process, the leak test valve 12 is in the closed state. When the pressurization ends and the leak test valve 7 is closed, the leak test valve 12 is opened. During the standing process, if the sealing effect of the valve body under test is not good, the oil will flow out from the return oil port of the valve body under test through the sealing position, and then flow out from the return oil pipe 10 connected to the detection base 9, and then flow out through the leak test port 11 and the leak test valve 12. By observing whether there are droplets falling from the leak test valve 12, or by setting a collection container at the outlet of the leak test valve 12, after a period of time, the oil body under test can be judged as to whether it is leaking oil and the degree of leakage based on whether oil is collected and the amount of oil.

[0031] It should be noted that during the test, the valve stem of the valve body under test must first be controlled to seal the oil port. After the test, the valve stem must also be controlled to release the seal. During the movement of the valve stem, some oil will flow out from the return oil pipe 10 and into the oil tank 1. Therefore, the other end of the return oil pipe 10 needs to be connected to the oil tank 1. During the test, if oil leaks due to poor sealing of the valve body under test, it will flow out through the leak test port 11 and the leak test valve 12. This can be achieved by controlling the position of the leak test port 11. For example, if the position of the leak test port 11 is lower than the highest point of the return oil pipe 10, the oil will need to do more work to continue flowing downstream, so it will flow out from the leak test port 11. Alternatively, the leak test port 11 can be placed close to the end of the return oil pipe 10 that is connected to the return oil port of the valve body under test. Since the return oil pipe 10 and the main return oil circuit 13 have a certain length, the leaked oil can also flow out from the leak test port 11 based on the principle of proximity.

[0032] Furthermore, the starting ends of each detection oil circuit 6 converge and connect to the energy storage oil circuit 5 via the main oil inlet circuit 14. This facilitates the connection between each detection oil circuit 6 and the energy storage oil circuit 5, and also facilitates the return of oil from each detection oil circuit 6 to the oil tank 1 after the test. Specifically, the test device also includes a safety valve 15. The oil inlet of the safety valve 15 is connected to the main oil inlet circuit 14, and the oil return port of the safety valve 15 is used to connect to the oil tank 1. If the oil pump 3 malfunctions and cannot be shut off during the pressurization process, the oil pressure in the energy storage oil circuit 5 will continue to rise. When it exceeds the opening pressure of the safety valve 15, the safety valve 15 will automatically open, allowing the high-pressure oil to flow back to the oil tank 1, ensuring test safety.

[0033] Meanwhile, the test device also includes a pressure relief valve 16. The oil inlet of the pressure relief valve 16 and the oil inlet of the safety valve 15 are connected to the main oil inlet 14 through the same pressure relief oil inlet circuit 17. The oil return port of the pressure relief valve 16 and the oil return port of the safety valve 15 are connected to the oil tank 1 through the same pressure relief oil return circuit 18. This not only ensures the normal function of the safety valve 15, but also simplifies the pipeline. After the test, by manually opening the pressure relief valve 16, the hydraulic pressure in the test oil circuit 6, the main oil inlet 14, the oil supply module 2, and the energy storage oil circuit 5 can all flow back to the oil tank 1.

[0034] The aforementioned energy storage oil circuit 5, detection oil circuit 6, main oil inlet circuit 14, pressure relief oil inlet circuit 17, pressure relief return oil circuit 18, and main return oil circuit 13 are all formed using oil pipes. Only the oil supply module 2 and the detection base 9 are independent modules with some oil circuits processed inside.

[0035] The working principle of the hydraulic mechanism valve body sealing test device of this utility model is as follows:

[0036] During the test, the three valve bodies to be tested are installed on their respective testing bases 9. The valve stems of the valve bodies to be tested are controlled to block the oil ports, and the pressure relief valve 16 and each leak detection valve 12 are locked. The leak detection valve 7 is kept open. Then, the oil pump 3 is started, and the oil pump 3 draws oil from the oil tank 1. The oil fills the oil chamber of the oil supply module 2 and enters the energy storage device 4 through the energy storage oil circuit 5. As the nitrogen in the energy storage device 4 is gradually compressed, the oil pressure in the energy storage oil circuit 5 and the detection oil circuit 6 continuously increases. The oil pressure value can be observed through the oil pressure gauge 20 or the pressure gauge 8. When the oil pressure reaches 32MPa, the oil pump 3 is stopped. If the oil pump 3 fails to stop as required, the safety valve 15 will automatically open and release pressure. The oil in the energy storage oil circuit 5 will flow back to the oil tank 1 through the pressure relief return oil circuit 18.

[0037] When the oil pressure reaches 32MPa and the oil pump 3 stops working, close all leak detection valves 7 and open all leak testing valves 12. After standing for a period of time, observe whether the pressure gauge 8 changes, and at the same time check whether oil drips from the leak testing valve 12 or whether oil is collected in the collection container. This will determine whether the valve body under test is leaking oil, and the degree of oil leakage can also be determined based on the amount of oil collected. After the test, close all leak testing valves 12 and open all leak detection valves 7, and then open the pressure relief valve 16. At this time, most of the oil in the oil circuit flows back to the oil tank 1 through the pressure relief return oil circuit 18, and a small portion of the oil flows back to the oil tank 1 through the return oil pipe 10 and the main return oil circuit 13 when the valve stem moves to release the sealing effect.

[0038] In other embodiments of the hydraulic mechanism valve body sealing test device: a low oil pressure alarm may not be installed in the oil tank, and the oil condition may be manually observed at regular intervals.

[0039] In other embodiments of the hydraulic mechanism valve body sealing test device: when pressure detection devices are provided on each detection oil line, each pressure detection device can also be a pressure sensor. In this case, a corresponding control system needs to be configured to receive the detection signal from the pressure sensor and display the final pressure value through calculation.

[0040] In other embodiments of the hydraulic mechanism valve body sealing test device: pressure detection devices may not be installed on each test oil line. In this case, during the pressurization process, the pressure value in the energy storage oil line is observed only by the pressure gauge on the oil supply module. During the process of testing the sealing performance of each valve body to be tested, it is only by checking whether oil drips out of the leak test valve to determine whether the valve body to be tested is leaking oil.

[0041] In other embodiments of the hydraulic mechanism valve body sealing test device: each return oil pipe no longer converges into a total return oil circuit, but is connected to the oil tank individually.

[0042] In other embodiments of the hydraulic mechanism valve body sealing test device: the pressure relief valve and the safety valve can also be set separately, and the two no longer share a pressure relief inlet oil line and a pressure relief return oil line.

[0043] In other embodiments of the hydraulic mechanism valve body sealing test device: the test device may not include a pressure relief valve. After the test, the oil can flow back to the oil tank through the valve body under test, the test base, and the return oil pipe after the blockage is released by controlling the valve stem action.

[0044] In other embodiments of the hydraulic mechanism valve body sealing test device: the test device may not include a safety valve. In this case, the oil pump needs to be inspected and maintained frequently to ensure its normal operation. Of course, if the oil pump cannot be stopped during the test, the power supply can be cut off to ensure safety.

[0045] In other embodiments of the hydraulic mechanism valve body sealing test device: the beginning of each test oil circuit can be connected to the energy storage oil circuit respectively, and the main oil inlet circuit is no longer set. In this case, if the test device includes a safety valve and / or a pressure relief valve, the oil inlet of the safety valve and / or pressure relief valve can be directly connected to the energy storage oil circuit.

[0046] In other embodiments of the hydraulic mechanism valve body sealing test device: the leak test interface can also be set in the middle of the return oil pipe. In this case, it is necessary to control the relative position between the leak test interface and the highest point of the return oil pipe to ensure that the oil leaking from the valve body under test is discharged through the leak test interface.

[0047] In other embodiments of the hydraulic mechanism valve body sealing test device: the test device may not include the test base. In this case, the oil inlet of the valve body under test is directly connected to the end of the test oil circuit, and the oil return port of the valve body under test is directly connected to the return oil pipe.

[0048] In other embodiments of the hydraulic mechanism valve body sealing test device: the energy storage oil circuit, the detection oil circuit, etc., may not be formed by oil pipes, but rather by setting a valve block as in the prior art CN108443131A. The oil pump, energy storage device, valve body under test, leak detection valve, etc. are all installed on the valve block. The energy storage oil circuit and the detection oil circuit are both located inside the valve block. The pressure detection device and the return oil pipe are also connected to the valve block.

[0049] In other embodiments of the hydraulic mechanism valve body sealing test device: a leak test tube can be directly connected to each oil return pipe, and the leak test valve is installed on the leak test tube.

[0050] In other embodiments of the hydraulic mechanism valve body sealing test device: no leak test interface or leak test pipe is set on each return oil pipe. At this time, each test oil line is equipped with a pressure detection device downstream of the leak detection valve. The pressure detection device is used to determine whether the valve body under test is leaking oil.

[0051] In other embodiments of the hydraulic mechanism valve body sealing test device: there can be two test oil lines, or of course four or more.

[0052] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. The patent protection scope of the present utility model shall be determined by the claims. Similarly, any equivalent structural changes made based on the description and drawings of the present utility model shall also be included within the protection scope of the present utility model.

Claims

1. A hydraulic valve body sealing performance testing device, comprising an oil pump and an accumulator, wherein the oil pump inlet is connected to an oil tank, the oil pump outlet is connected to the accumulator inlet via an accumulator oil circuit, the accumulator oil circuit is connected to a detection oil circuit, the end of the detection oil circuit is connected to the inlet of the valve body under test, and the testing device further comprises a return pipe with one end connected to the return port of the valve body under test and the other end connected to the oil tank, characterized in that... There are two or more detection oil circuits connected in parallel. Each detection oil circuit is equipped with a leak detection valve. The return oil pipe corresponds to each detection oil circuit. Each detection oil circuit is equipped with a pressure detection device downstream of the leak detection valve. And / or each return oil pipe is equipped with a leak detection interface or is connected to a leak detection pipe. Each leak detection interface or each leak detection pipe is equipped with a leak detection valve.

2. The hydraulic mechanism valve body sealing test device according to claim 1, characterized in that, The test apparatus also includes a test base corresponding to each test oil circuit. Each test base is provided with a fixing hole for fixing the valve body to be tested. Each test base is also provided with a first interface that is connected to the corresponding test oil circuit and is used to connect with the oil inlet of the valve body to be tested, and a second interface that is used to connect with the oil return port of the valve body to be tested. Each oil return pipe is connected to the corresponding test base and is connected to the second interface.

3. The hydraulic mechanism valve body sealing test device according to claim 1 or 2, characterized in that, Each return oil pipe is equipped with the aforementioned leak detection interface or is connected to the aforementioned leak detection pipe. The leak detection interface or leak detection pipe is located near the end of the return oil pipe that is connected to the return oil port of the valve body to be tested.

4. The hydraulic mechanism valve body sealing test device according to claim 1 or 2, characterized in that, The beginnings of each detection oil circuit converge and connect to the energy storage oil circuit through the main oil inlet circuit.

5. The hydraulic mechanism valve body sealing test device according to claim 4, characterized in that, The test apparatus also includes a safety valve, whose inlet is connected to the main oil inlet circuit, and whose return port is used to connect to the oil tank.

6. The hydraulic mechanism valve body sealing test device according to claim 5, characterized in that, The test apparatus also includes a pressure relief valve. The oil inlet of the pressure relief valve and the oil inlet of the safety valve are connected to the main oil inlet through the same pressure relief oil inlet circuit. The oil return port of the pressure relief valve and the oil return port of the safety valve are connected to the oil tank through the same pressure relief oil return circuit.

7. The hydraulic mechanism valve body sealing test device according to claim 1 or 2, characterized in that, All return oil pipes converge into a main return oil circuit for connecting the oil tank.

8. The hydraulic mechanism valve body sealing test device according to claim 1 or 2, characterized in that, The test apparatus includes an oil supply module, an oil pump mounted on the oil supply module, and an oil pressure gauge also mounted on the oil supply module.

9. The hydraulic mechanism valve body sealing test device according to claim 1 or 2, characterized in that, Each oil circuit is equipped with the aforementioned pressure detection device, and each pressure detection device is a pressure gauge.

10. The hydraulic mechanism valve body sealing test device according to claim 1 or 2, characterized in that, The test apparatus also includes an oil tank, which is equipped with a low oil pressure alarm.

Images