Hydraulic test system, device and method

Abstract

The invention discloses a hydraulic test system, device and method wherein the hydraulic test system comprises a hydraulic circuit, two output oil paths and two test oil paths; a first reversing valve is arranged on the hydraulic loop; the first reversing valve is at least provided with two groups of working ports, a group of cut-off stations and two groups of access stations; the two groups of working ports are configured to be communicated with the hydraulic loop at one group of access stations respectively and disconnected with the hydraulic loop at the cut-off station; two groups of working ports of the first reversing valve are respectively connected with one group of output oil path, the first group of output oil path is provided with a pressure reducing valve and the other end is provided with a first interface, and the other end of the second group of output oil path is provided with a second interface; the two groups of test oil paths are respectively used for testing the working conditions of the execution element and the control element; the hydraulic test system can meet various test requirements of the aircraft hydraulic system, the integration level of hydraulic test equipment is high, hydraulic test pipelines are arranged clearly, functional distinguishing is clear, miniaturization of the equipment is facilitated, and the aircraft ground maintenance efficiency is improved.

Description

Technical Field

[0001] The present invention relates to the field of hydraulic testing equipment, and in particular to a hydraulic testing system, equipment and method. Background Art

[0002] For example, aircraft hydraulic systems include various power components, actuators, control components and auxiliary components, and have the characteristics of complex structure and high integration. The accessories of the hydraulic system need to be regularly inspected and maintained to ensure that the performance and functions of the hydraulic accessories meet the process requirements. There are large differences in the detection principles and required equipment of various components in the hydraulic system. At present, most of the detection equipment on the market can only be used for one or more tests of the aircraft hydraulic system. The integration of the detection equipment is poor, resulting in a large number of detection equipment required for the entire process of aircraft hydraulic system detection.

[0003] The few highly integrated hydraulic testing equipment on the market also have many shortcomings due to the large number of testing items, such as large equipment size, diverse models and specifications, and complex hydraulic pipelines, which affect the maintenance efficiency of aircraft ground maintenance work. Summary of the invention

[0004] The purpose of the present invention is to overcome the shortcomings of the background technology and provide a hydraulic testing system, equipment and method, which can be applied but not limited to the maintenance and inspection of aircraft hydraulic systems, that is, it can also be suitable for the maintenance and inspection of hydraulic systems of mechanical equipment such as vehicles and ships as needed.

[0005] The purpose of the present invention is achieved through the following technical solutions:

[0006] In a first aspect, the present invention provides a hydraulic test system, comprising:

[0007] A hydraulic circuit; a first reversing valve is arranged on the hydraulic circuit, and the first reversing valve has at least two groups of working ports, one group of cut-off positions and two groups of passage positions; the two groups of working ports are configured to be connected to the hydraulic circuit when each is in a group of passage positions, and are both disconnected from the hydraulic circuit when in the cut-off positions;

[0008] Two groups of output oil circuits, the two groups of working ports of the first reversing valve are respectively connected to one group of output oil circuits, a pressure reducing valve is provided on the first group of output oil circuits and / or a pressure increasing valve is provided on the second group of output oil circuits, a first interface is provided at the other end of the first group of output oil circuits, and a second interface is provided at the other end of the second group of output oil circuits, so that the output medium pressures of the first interface and the second interface are different;

[0009] A first test oil circuit is connected to the same group of working ports of the first reversing valve as the second group of output oil circuits, and is used to test the working condition of the actuator; and

[0010] The second test oil circuit has one end detachably connected to the second interface and the other end communicated with the hydraulic circuit, and is used to test the working condition of the control element.

[0011] Further, the first test oil circuit includes:

[0012] a second reversing valve having at least two groups of working ports, one group of shutoff positions and two groups of passage positions; an oil inlet of the second reversing valve is connected to the second group of working ports of the first reversing valve, an oil outlet is connected to the hydraulic circuit, and the oil inlet and the oil outlet of the second reversing valve are not connected when the second reversing valve is configured to be in the shutoff position; and

[0013] The third interface and the fourth interface are used to respectively connect the measured actuators, and the third interface and the fourth interface are respectively connected to a group of working ports of the second reversing valve, and the second reversing valve is configured so that the oil outlet / return directions of the two groups of working ports are opposite under the two groups of passage positions.

[0014] Further, the second test oil circuit includes:

[0015] A double-acting piston cylinder, one group of chambers of which is connected to a fifth interface, and another group of chambers of which is connected to a sixth interface, and the fifth interface and the sixth interface are each connected to a group of working ports of a measured control element; and

[0016] The seventh interface is arranged on the hydraulic circuit. When the second interface is connected to the oil inlet of the tested control element, the seventh interface is connected to the oil return port of the tested control element to form a passage for testing the working state of the tested control element.

[0017] Furthermore, the second test oil circuit also includes a flow detection oil circuit, one end of the flow detection oil circuit is connected to the seventh interface and the other end is connected to the hydraulic circuit, and a flow meter is provided on the flow detection oil circuit.

[0018] Further, the flow detection oil circuit includes two groups of detection branches connected in parallel between the seventh interface and the hydraulic circuit;

[0019] Both detection branches are provided with flow meters, and the flow measurement ranges of the two flow meters are different; both detection branches are also provided with valves to selectively allow the medium to pass through any detection branch.

[0020] Furthermore, the second test oil circuit also includes an oil leakage detection branch, one end of the oil leakage detection branch is connected to the seventh interface, and the other end is provided with a ninth interface, and a valve is provided on the oil leakage detection branch.

[0021] Furthermore, it also includes a high-pressure output oil circuit, which has a manual high-pressure pump and an eighth interface, wherein the eighth interface is used to output high-pressure medium to the measured element.

[0022] Furthermore, an electro-hydraulic proportional control system is provided in the hydraulic circuit to adjust the medium pressure in the hydraulic circuit; wherein the oil inlet end of the high-pressure output oil circuit is connected to the hydraulic circuit.

[0023] In a second aspect, the present invention further provides a hydraulic testing device, wherein the hydraulic testing device has the aforementioned hydraulic testing system;

[0024] The hydraulic testing equipment also has a group of panels, on which a first interface, a second interface, a third interface, a fourth interface, a fifth interface, a sixth interface and a seventh interface are installed.

[0025] In a third aspect, the present invention further provides a method for testing a hydraulic test system, comprising:

[0026] Pressure resistance and sealing test: By switching between two groups of passage positions in the first reversing valve, the first interface or the second interface outputs the pressure medium to the measured component, closes the medium outlet in the measured component, and detects whether the working condition of the measured component is abnormal;

[0027] Actuator working condition test: The third interface and the fourth interface are respectively connected to two groups of chambers of the actuator, and the oil outflow / return direction of the third interface and the fourth interface is changed by the second reversing valve to detect whether the working condition of the actuator is abnormal.

[0028] The technical solution of the embodiment of the present invention has at least the following advantages and beneficial effects:

[0029] The hydraulic testing system of the present invention integrates two groups of output oil circuits with unequal medium output pressures, which can be used for pressure resistance tests and sealing tests of various components in the aircraft hydraulic system; in addition, the hydraulic testing system also integrates a first test oil circuit and a second test oil circuit, wherein the first test oil circuit can be used for operating condition tests of actuators such as hydraulic cylinders, and the second test oil circuit can be used for operating condition tests of control components such as solenoid valves, which can meet various testing requirements of various components of the aircraft hydraulic system; the hydraulic testing equipment of the present invention is provided with the aforementioned hydraulic testing system, which has a high degree of integration and a clear layout of hydraulic test pipelines and clear functional distinctions, which is conducive to the miniaturization of equipment and improves the efficiency of aircraft ground maintenance work. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 is a hydraulic principle diagram of a hydraulic test system in an embodiment of the present invention;

[0031] Figure 2 is a front view of a hydraulic test device in an embodiment of the present invention; DETAILED DESCRIPTION

[0032] In order to make the purpose, 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 in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0033] The invention provides a hydraulic test system, equipment and method.

[0034] Reference Figure 1 , a hydraulic testing system includes a hydraulic circuit L1, two sets of output oil circuits, a first test oil circuit L4 and a second test oil circuit L5.

[0035] Among them, it is easy to understand that the hydraulic circuit L1 at least includes necessary components such as an oil tank, a power element, and an oil pipe. The oil inlet and outlet ends of the oil pipe are connected to the oil tank to form a circuit, and the power element is used to enable the medium in the oil tank to flow under pressure in the oil pipe. In addition, it is well known to those skilled in the art that other valves, filters, sensors and other structures can also be added to the hydraulic circuit L1 according to actual functions and needs.

[0036] In the hydraulic testing system of the present invention, a first reversing valve 8 is provided on the hydraulic circuit L1, and the first reversing valve 8 cooperates with the aforementioned two groups of output oil circuits, the first test oil circuit L4 and the second test oil circuit L5 to perform the functions required by the present invention.

[0037] Specifically, refer to Figure 1 In the present invention, a first reversing valve 8 is provided on the hydraulic circuit L1, and the first reversing valve 8 has a working port A, a working port B, an oil inlet P, an oil return port T, a group of cut-off positions and two groups of passage positions, wherein the oil inlet P and the oil return port T are connected to the hydraulic circuit L1, the working port A is connected to the hydraulic circuit L1 when the first reversing valve 8 is in the first group of passage positions, the working port B is connected to the hydraulic circuit L1 when the first reversing valve 8 is in the other group of passage positions, and the working port A and the working port B are both disconnected from the hydraulic circuit L1 when they are in the cut-off position.

[0038] Obviously, the first reversing valve 8 can be a manual valve or a solenoid valve. In order to facilitate the system to control the opening and closing of the valve, the first reversing valve 8 in the present invention preferably adopts a solenoid valve structure; in addition, in order to achieve the above-mentioned function, the first reversing valve 8 should be at least a three-position four-way solenoid valve. Of course, other multi-position multi-way solenoid valves can also be selected. When in use, only two groups of passage positions, a cut-off position and two groups of working ports in the above-mentioned multi-position multi-way solenoid valve are enabled; in the present invention, the first reversing valve 8 preferably uses an M-type three-position four-way solenoid valve.

[0039] Reference Figure 1In the present invention, the two groups of output oil circuits are divided into a first output oil circuit L2 and a second output oil circuit L3, wherein the first output oil circuit L2 is connected to the working port A of the first reversing valve 8, and the second output oil circuit L3 is connected to the working port B of the first reversing valve 8, wherein the first output oil circuit L2 is provided with a pressure reducing valve 9 and / or a pressure increasing valve is provided on the second output oil circuit L3, so that the medium pressures output by the first output oil circuit L2 and the second output oil circuit L3 are not connected.

[0040] As one of the implementable methods of the present invention, a pressure reducing valve 9 is provided on the first group of output oil circuits L2, a first interface J1 is provided at the other end of the first output oil circuit L2, and a second interface J2 is provided at the other end of the second group of output oil circuits L3, and the output medium pressures of the first interface J1 and the second interface J2 are different.

[0041] Reference Figure 1 The first test oil circuit L4 and the second output oil circuit L3 are both connected to the working port B of the first reversing valve 8, that is, when the working port B in the first reversing valve 8 is connected to the hydraulic circuit L1, oil can be supplied to the second output oil circuit L3 and the first test oil circuit L4 at the same time.

[0042] The first test oil circuit L4 is used to test the working condition of the actuator a, and the first test oil circuit includes a second reversing valve 10, a third interface J3 and a fourth interface J4.

[0043] Among them, the second reversing valve 10 at least has a working port A, a working port B, an oil inlet P, an oil return port T, a group of cut-off positions and two groups of passage positions. The oil inlet P of the second reversing valve 10 is connected with the working port B of the first reversing valve 8, and the oil outlet T of the second reversing valve 10 is connected with the hydraulic circuit L1. The second reversing valve 10 is configured so that the oil inlet P and the oil outlet T are not connected when in the cut-off position; in one group of passage positions, the medium in the hydraulic circuit L1 enters the second reversing valve 10 along the oil inlet P and is then output along the working port A, and the return oil medium is input into the second reversing valve 10 along the working port B, and then flows into the hydraulic circuit L1 along the return oil port T; in the other group of passage positions, the medium in the hydraulic circuit L1 enters the second reversing valve 10 along the oil inlet P and then is output along the working port B, and the return oil medium is input into the second reversing valve 10 along the working port A, and then flows into the hydraulic circuit L1 along the return oil port T.

[0044] Similar to the first reversing valve 8, the second reversing valve 10 can be a manual valve or a solenoid valve, or a multi-position multi-way solenoid valve having more working positions and interfaces than a three-position four-way solenoid valve. In the present invention, the second reversing valve 10 is preferably an O-type three-position four-way solenoid valve.

[0045] Among them, one end of the third interface J3 is connected to the working port A of the second reversing valve 10, one end of the fourth interface J4 is connected to the working port B of the second reversing valve, and the other end of the third interface J3 and the other end of the fourth interface J4 are used to connect the actuators in the aircraft hydraulic system, and the actuators that require hydraulic reversing can be tested.

[0046] Specifically, the third interface J3 and the fourth interface J4 can be connected to the two groups of chambers of the tested actuator a (piston cylinder), and oil can be alternately supplied / returned through the third interface J3 and the fourth interface J4 to test the extension and retraction of the piston rod in the actuator a, whether there is medium leakage and other working conditions.

[0047] Reference Figure 1 The second test oil circuit L5 has one end detachably connected to the second interface J2 and the other end communicated with the hydraulic circuit L1 through the seventh interface J7, and is used to test the working condition of the control element b.

[0048] As one of the implementable methods of the present invention, the second test oil circuit L5 includes a double-acting piston rod 11 and a seventh interface J7. The double-acting piston cylinder 11 has two groups of closed chambers, one group of chambers is connected to the fifth interface J5, and the other group of chambers is connected to the sixth interface J6. The control element b under test is a group of three-position four-way solenoid valves, and the fifth interface J5 and the sixth interface J6 are respectively connected to a group of working ports of the control element under test; the seventh interface J7 is connected to the hydraulic circuit L1; during testing, the second interface J2 is connected to the oil inlet P of the control element b under test through a pipe, and the seventh interface J7 is connected to the oil return port T of the control element b under test to form a passage. By changing the valve core position of the control element b under test, the response of the double-acting piston cylinder 11 to the change in the action of the control element b under test is observed to test the working state of the control element b under test.

[0049] In addition, as a further extension of the second test oil circuit L5 solution, the second test oil circuit L5 also includes a flow detection oil circuit L7, one end of the flow detection oil circuit L7 is connected to the seventh interface J7 and the other end is connected to the hydraulic circuit L1, and a flow meter is provided on the flow detection oil circuit L7, which can detect the medium flow information during the operation of the second test oil circuit L5.

[0050] As one of the possible implementation modes of the present invention, refer to Figure 1The flow detection oil circuit L7 includes two groups of detection branches connected in parallel between the seventh interface J7 and the hydraulic circuit L1, namely the first detection branch L70 and the second detection branch L71. The first detection branch L70 is provided with a flow meter Q2 and a needle valve K2, and the second detection branch L71 is provided with a flow meter Q1 and a throttle valve K4. The flow measurement ranges of the two groups of flow meters Q1 and Q2 are different. The first detection branch L70 or the second detection branch L71 can be flexibly selected according to the different medium flow rates passing through different measured control elements b; for example, when the flow rate of the flow detection oil circuit L7 is large, the flow rate is controlled by the throttle valve K4, and when the flow rate is small, it is controlled by the needle valve K2.

[0051] In addition, the second test oil circuit L7 also includes an oil leakage detection branch, one end of the oil leakage detection branch is connected to the seventh interface J7, and the other end is provided with a ninth interface J9. A needle valve K1 is provided on the oil leakage detection branch. During oil leakage detection, since the amount of oil leakage is small, generally 100ml to 200ml, the amount of oil leakage at the ninth interface J9 can be directly measured by a measuring cup.

[0052] Reference Figure 1 In order to meet the higher medium pressure required for testing the component under test, a high-pressure output oil circuit L6 is also provided in the hydraulic test system. The high-pressure output oil circuit L6 has a manual high-pressure pump 13 and an eighth interface J8, wherein the eighth interface J8 is used to output high-pressure medium to the component under test.

[0053] The high-pressure output oil circuit L6 can be directly connected to the oil tank, and can also be connected to the hydraulic circuit L1.

[0054] As one of the possible implementation methods of the present invention, one end of the high-pressure output oil circuit L6 is connected to the hydraulic circuit L1. In the high-pressure output oil circuit L6, a high-pressure filter 12, a needle valve K5 and an eighth interface J8 are arranged downstream of the manual high-pressure pump 13. In addition, the high-pressure output oil circuit L6 also has a set of pressure relief circuits, and a needle valve K3 is arranged on the pressure relief circuit, which can discharge the high-pressure medium generated by the manual high-pressure pump 13 into the hydraulic circuit L1.

[0055] The high-pressure output oil circuit L6 can be used for strength and high-pressure sealing tests of the components under test.

[0056] Reference Figure 1 In one embodiment, the oil pipe of the hydraulic circuit L1 is provided with an oil suction filter 1, an oil supply ball valve QF1, a motor oil pump group 2, a one-way valve 3, a first oil filter 4, a second oil filter 5, a high-pressure ball valve QF2, a first reversing valve 8, an oil return ball valve QF3, a cooler 15, and an oil return filter 16 in sequence from the oil outlet end to the oil return end.

[0057] Among them, the motor oil pump group 2 is the power element of the hydraulic test system, which transports the medium in the oil tank to the oil pipe; the motor oil pump group 2 is provided with an electro-hydraulic proportional control system to adjust the medium pressure and flow in the hydraulic circuit L1, and can provide 0-22MPa hydraulic oil, and the oil supply flow adjustment range is: 0-70L / min.

[0058] Among them, the one-way valve 3 is used for the one-way output of the medium in the oil pipe to avoid oil return.

[0059] The first oil filter 4 and the second oil filter 5 have different filtering grades. The filtering accuracy of the first oil filter 4 is 10 μm, and the filtering accuracy of the second oil filter 5 is 3 μm. The medium is filtered twice by the first oil filter 4 and the second oil filter 5 .

[0060] The cooler 15 is used to cool the medium in the oil pipe, and an air cooling or liquid cooling structure may be selected; the return oil filter 16 is used to filter impurities in the return oil section of the oil pipe.

[0061] In addition, a pressure sensor P1 may be provided on the oil pipeline between the high-pressure ball valve QF2 and the first reversing valve 8 , and an accumulator 6 may be provided on the oil pipeline between the second oil filter 5 and the high-pressure ball valve QF2 .

[0062] The first interface J1 outputs a pressure of 0-5 MPa and a maximum flow rate of 70 L / min. A pressure sensor P2 is provided on the first interface J1.

[0063] The outlet pressure of the second interface J2 is 0-22MPa, and a pressure sensor P3 is provided on it.

[0064] The third interface J3 is provided with a pressure sensor P4, the fourth interface J4 is provided with a pressure sensor P5, the fifth interface J5 is provided with a pressure sensor P6, the sixth interface J6 is provided with a pressure sensor P7, and the seventh interface J7 is provided with a pressure sensor P9.

[0065] The eighth interface J8 is supplied with pressure through a manual high-pressure pump 13 and can output a pressure of 0 to 42 MPa. A pressure sensor P8 is provided on the eighth interface J8.

[0066] Among them, the capacity of the oil tank is 350L. A liquid level gauge 20 is installed on the oil tank to observe the oil amount in the tank. At the same time, a liquid level relay 18 is set to automatically cut off the power supply of the oil pump when the liquid level is low to prevent the oil pump from idling when the liquid level is insufficient and causing damage to the pump; in addition, the temperature sensor 19 can detect the oil temperature in the oil tank, and the air filter 17 has its own filter, which can be used for refueling the oil tank and controlling the pressure in the oil tank (connected to the atmosphere); a drain ball valve QF4 is set at the bottom of the oil tank, which can be used to discharge the hydraulic oil in the oil tank.

[0067] The turbine flowmeter (Q1) has a range of 16.7 to 166.7 L / min, and the turbine flowmeter (Q2) has a range of 0 to 20 L / min. These meet the flow test requirements of all tested components.

[0068] In addition, a sampling valve K6 is also provided on the hydraulic circuit L1, which can sample the medium in the hydraulic circuit L1 and detect the oil contamination degree in the oil.

[0069] In addition, refer to Figure 2 An embodiment of the present invention further provides a hydraulic testing device 100, which includes the hydraulic testing system in the aforementioned embodiment.

[0070] In order to facilitate modular installation and assembly, the pump station composed of the oil tank and the motor oil pump group 2 is connected to the hydraulic circuit L1 through high-pressure hoses 7 and 14.

[0071] The hydraulic testing equipment 100 also has a group of panels 1000, on which the first interface J1, the second interface J2, the third interface J3, the fourth interface J4, the fifth interface J5, the sixth interface J6, the seventh interface J7 and the eighth interface J8 are installed; wherein, the first interface J1, the second interface J2, the third interface J3, the fourth interface J4, the fifth interface J5, the sixth interface J6, the seventh interface J7 and the eighth interface J8 are all quick connectors, and when not connected to other equipment, the above eight groups of interfaces all have a self-sealing function.

[0072] In addition, an embodiment of the present invention also provides a testing method for a hydraulic testing system as shown below.

[0073] First, the tested components and their testing processes are analyzed. The objects to be tested in the aircraft hydraulic system mainly include the actuator, solenoid valve, safety valve, aircraft main hydraulic system oil filter, aircraft brake system oil filter, etc.

[0074] Secondly, the test items mainly include accessory functionality test, performance test, pressure test, internal oil leakage of solenoid valve, structural integrity of filter element and filter element flow rate, etc.

[0075] For the pressure test, the inlet of the tested component needs to be pressurized, the outlet is blocked, and the surface deformation, cracks, oil leakage, etc. of the tested component are checked. According to the working parameter range responded by the tested component, the first output oil circuit L2, the second output oil circuit L3 or the high-pressure output oil circuit L6 can be used for detection.

[0076] For the sealing test, the inlet of the component under test needs to be pressurized, the outlet is blocked, and the surface of the component under test is checked for oil leakage. Similarly, according to the working parameter range responded by the component under test, detection can be carried out through the first output oil circuit L2, the second output oil circuit L3 or the high-pressure output oil circuit L6.

[0077] For performance testing, it is necessary to input the pressure required by the process at the inlet of the tested component, control the operation of the tested component (solenoid valve), and then detect its outlet flow rate, which can be carried out through the second test oil circuit L5 and the flow detection oil circuit L7.

[0078] For the functional test of the actuator, it is necessary to supply pressure to the inlet / outlet nozzles of the actuator to check the extension of the actuator piston rod, which can be done through the first test oil circuit L4.

[0079] For the filter element flow rate test, it is necessary to connect the filter element inlet and outlet to detect its outlet flow rate, which can be done through the first output oil circuit L1 or the second output oil circuit L2 in combination with the flow detection oil circuit L7.

[0080] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. Hydraulic test system, characterized in that: include: A hydraulic circuit; a first reversing valve is arranged on the hydraulic circuit, and the first reversing valve has at least two groups of working ports, one group of cut-off positions and two groups of passage positions; the two groups of working ports are configured to be connected to the hydraulic circuit when each is in a group of passage positions, and are both disconnected from the hydraulic circuit when in the cut-off positions; Two groups of output oil circuits, the two groups of working ports of the first reversing valve are respectively connected to one group of output oil circuits, the first group of output oil circuits are provided with a pressure reducing valve and / or the second group of output oil circuits are provided with a pressure increasing valve, the other end of the first group of output oil circuits is provided with a first interface, and the other end of the second group of output oil circuits is provided with a second interface, so that the output medium pressures of the first interface and the second interface are different; The first test oil circuit is connected to the same group of working ports of the first reversing valve as the second group of output oil circuits, and is used to test the working condition of the actuator; as well as The second test oil circuit has one end detachably connected to the second interface and the other end communicated with the hydraulic circuit, and is used to test the working condition of the control element.

2. The hydraulic test system according to claim 1, characterized in that: The first test oil circuit includes: a second reversing valve having at least two groups of working ports, one group of shutoff positions and two groups of passage positions; an oil inlet of the second reversing valve is connected to the second group of working ports of the first reversing valve, an oil outlet is connected to the hydraulic circuit, and the oil inlet and the oil outlet of the second reversing valve are not connected when the second reversing valve is configured to be in the shutoff position; and The third interface and the fourth interface are used to respectively connect the measured actuators, and the third interface and the fourth interface are respectively connected to a group of working ports of the second reversing valve, and the second reversing valve is configured so that the oil outlet / return directions of the two groups of working ports are opposite under the two groups of passage positions.

3. The hydraulic test system according to claim 1 or 2, characterized in that: The second test oil circuit includes: A double-acting piston cylinder, one group of chambers of which is connected to a fifth interface, and another group of chambers of which is connected to a sixth interface, and the fifth interface and the sixth interface are each connected to a group of working ports of a measured control element; and The seventh interface is arranged on the hydraulic circuit. When the second interface is connected to the oil inlet of the tested control element, the seventh interface is connected to the oil return port of the tested control element to form a passage for testing the working state of the tested control element.

4. The hydraulic test system according to claim 3, characterized in that: The second test oil circuit also includes a flow detection oil circuit, one end of the flow detection oil circuit is connected to the seventh interface and the other end is connected to the hydraulic circuit, and a flow meter is arranged on the flow detection oil circuit.

5. The hydraulic test system according to claim 4, characterized in that: The flow detection oil circuit includes two groups of detection branches connected in parallel between the seventh interface and the hydraulic circuit; Both detection branches are provided with flow meters, and the flow measurement ranges of the two flow meters are different; both detection branches are also provided with valves to selectively allow the medium to pass through any detection branch.

6. The hydraulic test system according to claim 5, characterized in that: The second test oil circuit also includes an oil leakage detection branch, one end of the oil leakage detection branch is connected to the seventh interface, and the other end is provided with a ninth interface, and a valve is provided on the oil leakage detection branch.

7. The hydraulic test system according to claim 1 or 2, characterized in that: It also includes a high-pressure output oil circuit, which has a manual high-pressure pump and an eighth interface, wherein the eighth interface is used to output high-pressure medium to the measured element.

8. The hydraulic test system according to claim 7, characterized in that: An electro-hydraulic proportional control system is provided in the hydraulic circuit to adjust the medium pressure in the hydraulic circuit; wherein the oil inlet end of the high-pressure output oil circuit is connected to the hydraulic circuit.

9. Hydraulic testing equipment, characterized in that, The hydraulic testing device comprises a hydraulic testing system according to any one of claims 3 to 6; The hydraulic testing equipment also has a group of panels, on which a first interface, a second interface, a third interface, a fourth interface, a fifth interface, a sixth interface and a seventh interface are installed.

10. The hydraulic testing method of a hydraulic testing system according to any one of claims 2 to 6, characterized in that: include: Pressure resistance and sealing test: By switching between two groups of passage positions in the first reversing valve, the first interface or the second interface outputs the pressure medium to the measured component, closes the medium outlet in the measured component, and detects whether the working condition of the measured component is abnormal; Actuator working condition test: The third interface and the fourth interface are respectively connected to two groups of chambers of the actuator, and the oil outflow / return direction of the third interface and the fourth interface is changed by the second reversing valve to detect whether the working condition of the actuator is abnormal.

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