Direct detection type deflector micrometric displacement characteristic test bed and test method

Abstract

The invention belongs to the technical field of partial guide jet flow servo valve test, and provides a direct detection type partial guide plate micro-displacement characteristic test bench and a test method.The direct detection type partial guide plate micro-displacement characteristic test bench comprises a servo valve test device body; the oil supply system is used for providing required flow and pressure hydraulic oil for the test; the data acquisition system is used for acquiring various signals and comprises various sensors and an NI-PXI measurement and control system; according to the invention, the electromagnetic motor can be accurately and stably simulated to apply a rotation angle to the armature, the simulation accuracy and reliability are effectively improved, and the direct detection type displacement sensor is adopted, so that the measurement errors of the displacement of the deflector and the displacement of the valve core are fundamentally reduced, and the test precision is powerfully guaranteed; besides, by arranging a series of high-precision sensors, various parameters in the test can be comprehensively measured in real time, and the strict requirements of deeper research of the partial guide jet flow servo valve on test precision and parameter comprehensiveness are fully met.

Description

Technical Field

[0001] The invention belongs to the technical field of jet deflection servo valve test, and particularly relates to a direct detection type test bench and test method for the micro displacement characteristics of a jet deflector plate. Background Technique

[0002] As the core control element of an electro-hydraulic servo control system, the jet deflection servo valve has been widely used in key fields such as aerospace and military due to its outstanding advantages such as small moment of inertia, good dynamic performance, and strong anti-pollution ability. It plays an indispensable role especially in the control of rockets and missiles. Its working principle is as follows: when the control current is zero, the armature remains stationary without deflection, and the jet deflector plate on the feedback rod is in the middle position. At this time, the high-pressure oil can flow symmetrically through the jet deflector plate and be injected into the left and right receiving chambers, making the spool valve core stable in the stationary state; when the control current is not zero, the armature will deflect, and then drive the jet deflector plate to deflect together, which will break the symmetry of the oil pressure and flow in the left and right receiving chambers, and cause the spool valve core to start moving; to further improve the service performance of rockets and missiles, it is particularly important to deeply study the jet deflection servo valve, and the experimental research is a very crucial link, which includes the experiment on the micro displacement characteristics of the jet deflector plate; in the engineering field, the test accuracy is crucial, and it is an important basis for testing the accuracy of design results, analysis methods, analysis results, and analysis specifications; as the key equipment carrying the test accuracy, the test bench shoulders important functions and responsibilities; in the actual operation of the servo valve, extremely small displacement changes of the jet deflector plate may cause significant pressure differences at both ends of the spool valve; therefore, to deeply study its working principle and characteristics, it is necessary to conduct experiments on the micro displacement characteristics of the jet deflector plate at the micron-level accuracy.

[0003] However, at present, relevant domestic universities and research institutions generally adopt indirect measurement methods when building test benches; this method measures the displacement at the end of the feedback rod by extending the feedback rod, and then calculates the displacement of the jet deflector plate inside the valve by reverse deduction; however, this method is easily interfered by environmental factors, and large errors will be introduced in the calculation process, making it difficult to meet the research requirements of higher accuracy. Therefore, a direct detection type test bench and test method for the micro displacement characteristics of a jet deflector plate are needed to solve the above problems. Summary of the Invention

[0004] The purpose of the invention is to provide a direct detection type test bench and test method for the micro displacement characteristics of a jet deflector plate to solve the problems put forward in the above background technique.

[0005] To achieve the above purpose, the invention provides the following technical solution: A direct detection type test bench for the micro displacement characteristics of a jet deflector plate, comprising:

[0006] The servo valve test device body;

[0007] An oil supply system that provides the required flow rate and pressure of hydraulic oil for the test;

[0008] A data acquisition system for collecting various signals, including a variety of sensors and an NI-PXI measurement and control system;

[0009] A test data storage and analysis system for storing and analyzing test data;

[0010] The servo valve test device body, the oil supply system, the data acquisition system, and the test data storage and analysis system are integrated on a digital test bench.

[0011] A further technical solution is that the servo valve test device body is set as a deflected jet servo valve. A laser displacement meter is connected to one side of the deflected jet servo valve. The electromagnetic motor is disassembled to expose the armature assembly. The armature assembly is connected to a high-precision electric push rod through a mechanical connection structure. The high-precision electric push rod can give the armature a controllable deflection angle; A light passing hole for directly detecting micro-displacement is opened at a suitable position of the deflected jet servo valve for directly detecting the micro-displacement of the deflector plate; Micropores are opened for embedding thermocouples to detect the temperature near the deflector plate.

[0012] A further technical solution is that the oil supply system includes a hydraulic oil tank, a filter, a liquid level gauge, a liquid temperature gauge, an overflow valve, a hydraulic pump, a back pressure valve, a flow sensor, an accumulator, a pressure sensor, and a throttle valve;

[0013] The hydraulic oil tank is used to store the hydraulic oil required for the test;

[0014] The suction port of the hydraulic pump is connected to the hydraulic oil tank through a filter to suck in the oil. After the oil is stabilized by the accumulator and the flow rate is adjusted by the flow control valve, it is connected to the servo valve inlet through a pipeline;

[0015] The oil returned from the servo valve return port returns to the hydraulic oil tank through the back pressure valve and the return oil filter through a pipeline;

[0016] The overflow valve is installed between the outlet of the hydraulic pump and the oil supply pipeline for setting the system pressure and acting as a safety valve;

[0017] The liquid level gauge and the liquid temperature gauge are respectively installed on the hydraulic oil tank for measuring the volume and temperature of the oil in the hydraulic oil tank.

[0018] A further technical solution is that the digital acquisition system includes:

[0019] An implanted thermocouple for detecting the temperature near the deflector plate;

[0020] A laser displacement sensor that directly measures the micro-displacement of the deflector plate through the light passing hole. The laser optical path of the laser displacement sensor is aligned with the axis of the light passing hole;

[0021] A contact displacement sensor for measuring the displacement of a spool valve, with its measuring line coinciding with the axis of the spool valve core;

[0022] A flow sensor and a pressure sensor installed on the oil supply system pipeline in front of the oil inlet of the servo valve, used for measuring the flow rate and pressure of the inlet oil;

[0023] An NI-PXI measurement and control system composed of a PXIe chassis, a PXIe controller, an analog output card, and a data acquisition card, which is connected to the above-mentioned sensors and the output displacement signal interface of the electric push rod through cables respectively, for collecting signals and transmitting them to the test data storage and analysis system.

[0024] A further technical solution, the test data storage and analysis system includes:

[0025] A test data storage module, including physical storage hardware, a test database, and data mining technology. The test database adopts security measures to ensure the security and privacy of test data;

[0026] A test data analysis module, with functions of data preprocessing, feature extraction, and statistical analysis, for comprehensively analyzing test data.

[0027] A test method for the micro-displacement characteristics of a direct detection type deflector plate, applied to the direct detection type deflector plate micro-displacement characteristic test bench described in any of the above, including the following steps:

[0028] S1. Equipment layout: Arrange the test bench, computer, and NI-PXI measurement and control system at appropriate positions in the laboratory to prepare for subsequent test operations;

[0029] S2. Installation and testing of the oil supply system: Strictly follow the hydraulic schematic diagram and assembly drawings of the oil supply system, and connect the hydraulic oil tank, filter, liquid level gauge, liquid temperature gauge, overflow valve, hydraulic pump, back pressure valve, flow sensor, accumulator, pressure sensor, and throttle valve in sequence;

[0030] Connect the flow sensor and pressure sensor to the data acquisition card in the NI-PXI measurement and control system with cables, and connect the measurement and control system and the computer at the same time; temporarily connect the oil outlet and return oil port, add an appropriate amount of clean hydraulic oil to the hydraulic oil tank, supply power to the motor and start the hydraulic pump, adjust the hydraulic valve, and test whether the oil supply system operates normally without faults and whether the measurements of the flow sensor and pressure sensor are accurate; if there are no faults and the sensor measurements are normal, stop the machine and unload the load, disassemble the temporary oil pipe, place the oil supply system under the test bench surface, do a good job in sound insulation and vibration isolation treatment, and then connect the oil outlet and return oil port to the hydraulic connection plate of the test bench according to the correct oil ports;

[0031] S3. Installation of the servo valve test device body: Install the processed servo valve test device body on the hydraulic connection plate of the test bench table, ensuring firm installation and accurate positioning.

[0032] S4. Installation of sensors and cable connection: According to the position of the servo valve armature, use a fixture to adjust the installation position of the electric push rod so that it just touches one end of the electric push rod; according to the position of the light through hole, use a fixture to adjust the installation position of the laser displacement sensor so that its measured laser light path is on the axis of the light through hole; according to the position of the servo valve spool valve core, use a fixture to adjust the installation position of the contact displacement sensor so that its measured straight line and the axis of the spool valve core are on the same straight line; implant an implantable thermocouple into the micro-hole of the valve body and fix and seal it; connect the cables of the above sensors to the data acquisition card and arrange the cables in the test bench.

[0033] S5. End of the test: After completing the above operations, end the test process.

[0034] Compared with the prior art, the beneficial effects of the present invention are:

[0035] The present invention can meet the high-precision research requirements: The test bench adopts a high-precision electric push rod, which can accurately and stably simulate the electromagnetic motor applying an angular displacement to the armature, effectively improving the accuracy and reliability of the simulation. Moreover, a direct detection type displacement sensor is adopted, which fundamentally reduces the measurement error of the deflector plate displacement and the spool valve displacement, strongly guaranteeing the test accuracy. In addition, by configuring a series of high-precision sensors, various parameters in the test can be measured in real time and comprehensively, fully meeting the stringent requirements for test accuracy and parameter comprehensiveness in the further research of the deflector jet servo valve.

[0036] The present invention can accurately simulate the working conditions: The oil supply system of the test bench is designed and optimized in close combination with the actual working condition requirements of the servo valve in terms of pressure and flow rate setting; the system is complete in composition, and each component works in coordination, and can accurately and dynamically simulate the changes in pressure and flow rate under actual working conditions, providing a reliable test environment for studying the performance of the servo valve under real working conditions.

[0037] The present invention can achieve efficient data processing and management: The test bench is equipped with a functional data rapid analysis software and a data intelligent storage and retrieval system; during the test process, the test parameters are convenient for real-time monitoring and recording; after the test, the data is easy to query and in-depth analysis, providing efficient and convenient data support and management means for scientific research personnel to carry out in-depth research, and greatly improving the research efficiency and data utilization value. Description of the Drawings

[0038] Figure 1 It is a frame schematic diagram of a direct detection type deflector plate micro-displacement characteristic test bench described in the present invention.

[0039] Figure 2 Schematic diagram of the structure of a direct detection type partial deflection plate micro-displacement characteristic test bench according to the present invention;

[0040] Figure 3 Schematic diagram of the oil supply system according to the present invention.

[0041] In the figure: 1. Electric push rod; 2. Implanted thermocouple; 3. Laser displacement meter; 4. Displacement sensor; 5. Hydraulic oil tank; 6. Filter; 7. Liquid level gauge; 8. Liquid temperature gauge; 9. Overflow valve; 10. Hydraulic pump; 11. Back pressure valve; 12. Flow sensor; 13. Accumulator; 14. Pressure sensor; 15. Throttle valve. Specific implementation manners

[0042] The present invention will be further described below in conjunction with embodiments.

[0043] The following embodiments are used to illustrate the present invention, but cannot be used to limit the protection scope of the present invention. The conditions in the embodiments can be further adjusted according to specific conditions. Any simple improvement to the method of the present invention under the premise of the concept of the present invention belongs to the scope protected by the present invention.

[0044] Please refer to Figures 1-3 , the present invention provides a direct detection type partial deflection plate micro-displacement characteristic test bench, including a servo valve test device body;

[0045] An oil supply system for providing hydraulic oil with required flow and pressure for the test;

[0046] A data acquisition system for collecting various signals, including a variety of sensors and an NI-PXI measurement and control system;

[0047] A test data storage and analysis system for storing and analyzing test data;

[0048] The servo valve test device body, the oil supply system, the data acquisition system and the test data storage and analysis system are integrated into a digital test bench.

[0049] As Figures 1-2 shown, a direct detection type partial deflection plate micro-displacement characteristic test bench provided by the present invention, the servo valve test device body is set as a partial deflection jet servo valve, a laser displacement meter 3 is connected to one side of the partial deflection jet servo valve, the electromagnetic motor is disassembled to expose the armature assembly, the armature assembly is connected to the high-precision electric push rod 1 through a mechanical connection structure, and the high-precision electric push rod 1 can give the armature a controllable deflection angle; a light passing hole for directly detecting micro-displacement is opened at a suitable position of the partial deflection jet servo valve for directly detecting the micro-displacement of the partial deflection plate; a micro-hole is opened for burying the thermocouple to detect the temperature near the partial deflection plate.

[0050] As Figures 2-3As shown in the figure, a direct detection type partial guide plate micro-displacement characteristic test bench provided by the present invention, the oil supply system includes a hydraulic oil tank 5, two filters 6, a liquid level gauge 7, a liquid temperature gauge 8, a relief valve 9, a hydraulic pump 10, a back pressure valve 11, two flow sensors 12, an accumulator 13, four pressure sensors 14 and a throttle valve 15. The hydraulic oil tank 5 is connected to the two filters 6, the liquid level gauge 7, the liquid temperature gauge 8 and the relief valve 9. The two filters 6 are respectively connected to the hydraulic pump 10 and the back pressure valve 11. The hydraulic pump 10 and the back pressure valve 11 are both connected to the flow sensors 12. The two flow sensors 12 are both connected to two of the pressure sensors 14. The other two pressure sensors 14 are connected through the throttle valve 15. The relief valve 9, the hydraulic pump 10 and the flow sensors 12 are connected to the same accumulator 13;

[0051] The hydraulic oil tank 5 is used to store the hydraulic oil required for the test;

[0052] The suction port of the hydraulic pump 10 is connected to the hydraulic oil tank 5 through the filter 6 to suck in the oil. After the oil is stabilized by the accumulator 13 and the flow is regulated by the flow control valve, it is connected to the servo valve inlet through a pipeline;

[0053] The oil returned from the servo valve return port passes through the back pressure valve 11 and the return oil filter 6 and then returns to the hydraulic oil tank 5 through a pipeline;

[0054] The relief valve 9 is installed between the outlet of the hydraulic pump 10 and the oil supply pipeline, and is used to set the system pressure and act as a safety valve;

[0055] The liquid level gauge 7 and the liquid temperature gauge 8 are respectively installed on the hydraulic oil tank 5, and are used to measure the volume and temperature of the oil in the hydraulic oil tank 5.

[0056] As Figures 1-2 shown in the figure, a direct detection type partial guide plate micro-displacement characteristic test bench provided by the present invention, the digital acquisition system includes:

[0057] An implanted thermocouple 2 for detecting the temperature near the partial guide plate;

[0058] A laser displacement sensor 4 for directly measuring the micro-displacement of the partial guide plate through the light passing hole. The laser optical path of the laser displacement sensor 4 is aligned with the axis of the light passing hole;

[0059] A contact displacement sensor 4 for measuring the displacement of the spool valve, and its measuring line coincides with the axis of the spool valve core;

[0060] Flow sensors 12 and pressure sensors 14 installed on the oil supply pipeline of the oil supply system in front of the servo valve inlet, and used to measure the inlet oil flow and pressure;

[0061] The NI-PXI measurement and control system, which consists of a PXIe chassis, a PXIe controller, an analog output card, and a data acquisition card, is connected to the above-mentioned sensors and the output displacement signal interface of the electric push rod 1 through cables, and is used to collect signals and transmit them to the test data storage and analysis system.

[0062] As Figure 1 shown, a direct detection type partial guide plate micro-displacement characteristic test bench provided by the present invention, and the test data storage and analysis system includes:

[0063] A test data storage module, including physical storage hardware, a test database, and data mining technology. The test database adopts security measures such as data encryption, permission management, and access control to ensure the security and privacy of test data;

[0064] A test data analysis module, which has functions of data preprocessing, feature extraction, and statistical analysis, and is used to comprehensively analyze test data.

[0065] A direct detection type partial guide plate micro-displacement characteristic test method, which is applied to the direct detection type partial guide plate micro-displacement characteristic test bench in the above-mentioned embodiment, and includes the following steps:

[0066] S1. Equipment layout: Arrange the test bench, computer, and NI-PXI measurement and control system at appropriate positions in the laboratory to prepare for subsequent test operations;

[0067] S2. Installation and testing of the oil supply system: Strictly connect the hydraulic oil tank 5, two filters 6, a liquid level gauge 7, a liquid temperature gauge 8, a relief valve 9, a hydraulic pump 10, a back pressure valve 11, two flow sensors 12, an accumulator 13, four pressure sensors 14, and a throttle valve 15 in sequence according to the hydraulic schematic diagram and assembly drawings of the oil supply system;

[0068] Connect the flow sensors 12 and pressure sensors 14 to the data acquisition card in the NI-PXI measurement and control system with cables, and connect the measurement and control system and the computer at the same time; temporarily connect the oil outlet and the oil return port, add an appropriate amount of clean hydraulic oil to the hydraulic oil tank 5, supply power to the motor and start the hydraulic pump 10, adjust the hydraulic valve, and test whether the oil supply system operates normally without faults and whether the measurements of the flow sensors 12 and pressure sensors 14 are accurate; if there is no fault and the sensor measurements are normal, stop the machine to unload the load, disassemble the temporary oil pipe, place the oil supply system under the test bench surface, make sound insulation and vibration isolation treatments, and then connect the oil outlet and the oil return port to the hydraulic connection plate of the test bench according to the correct oil ports;

[0069] S3. Installation of the servo valve test device body: Install the processed servo valve test device body on the hydraulic connection plate of the test bench surface to ensure firm installation and accurate position;

[0070] S4. Sensor Installation and Cable Connection: According to the position of the servo valve armature, use a fixture to adjust the installation position of the electric push rod 1 so that it just touches one end of the electric push rod 1; according to the position of the light through hole, use a fixture to adjust the installation position of the laser displacement sensor 4 so that its measured laser optical path is on the axis of the light through hole; according to the position of the servo valve spool, use a fixture to adjust the installation position of the contact displacement sensor 4 so that its measured straight line and the axis of the spool are on the same straight line; embed the implantable thermocouple 2 into the micro-holes of the valve body and fix and seal it; connect the cables of the above sensors to the data acquisition card, and arrange and organize the cables in the test bench;

[0071] S5. End of Test: After completing the above operations, end the test process.

[0072] Working Principle and Usage Process of the Present Invention: Preparation before Test: Select a well-ventilated, dry, spacious location without strong electromagnetic interference sources in the laboratory, and arrange the test bench, computer, and NI-PXI measurement and control system in sequence; check the appearance of each component of the test bench to ensure there is no obvious damage or deformation; carefully check whether the key components of the electric push rod 1 and the sensors deviate from the preset installation positions. If there are deviations, use tools such as fixtures for fine adjustment in a timely manner; check whether the connections between the components of the oil supply system are tight and normal, check the color and impurities of the oil, and judge whether it needs to be replaced; check each connection cable one by one to see if it is firmly connected and in place, and whether there are problems such as looseness and damage; turn on the computer, start the test data storage and analysis system, check whether the software interface is normally displayed and whether each function can be normally called to ensure that all preparatory work is ready;

[0073] Debugging of the Oil Supply System: Set the pressure of the oil supply system to the unloading pressure, turn on the power supply of the pump station, and open the accumulator 13 at the pump outlet; according to the working pressure required for the actual test, slowly adjust the safety pressure of the relief valve 9, and closely monitor the change of the indication of the pressure sensor 14 during the adjustment process; finely adjust the oil supply flow by adjusting the opening of the throttle valve 15;

[0074] During specific operations, first call the preset pressure and flow values of the simulation working condition of this test from the test data storage and analysis system for loading; then, based on the digital acquisition system, obtain the data monitored by the inlet pressure and flow sensors 12 in real time, and carefully compare the monitored data with the loaded values; if the numerical deviation between the two is within the allowable range, it indicates that the oil supply system is operating normally and the test can be carried out normally; otherwise, it is necessary to adjust the relief valve 9 and the throttle valve 15 according to the deviation situation until the test requirements are met;

[0075] Operation during the Test: Call the preset armature deflection angle value from the test data storage and analysis system, send a control command to the electric push rod 1 through the NI-PXI measurement and control system, and precisely control the electric push rod 1 to extend a corresponding length, so as to push the armature to deflect at the set angle;

[0076] During the armature deflection process, the data acquisition card is used to collect data on the temperature and displacement changes along with the armature deflection detected by the implanted thermocouple 2, the laser displacement sensor 4, and the contact displacement sensor 4 in real time, and quickly transmit the data to the test data storage and analysis system;

[0077] · Test data processing: After receiving the collected data, the test data analysis module first preprocesses the test data, including removing outliers and filling missing values. Then, it uses the feature extraction algorithm to extract key characteristic parameters related to the micro-displacement characteristics of the deflector plate, such as displacement change and temperature change gradient. Then, through the statistical analysis function, it performs statistical calculations on the mean, variance, and correlation of the data to deeply explore the intrinsic relationship between various physical quantities. The test data storage module classifies and intelligently stores the processed data according to a pre-set data structure, for example, according to the test conditions and measurement time dimensions, so that scientific researchers can retrieve and call data conveniently and efficiently after the test. When all the predetermined test conditions are completed, the test ends, and the entire test process is completed.

[0078] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A direct detection type partial derivative plate micro-displacement characteristic test bench, characterized in that, Comprising: The servo valve test device body; An oil supply system that provides the required flow rate and pressure of hydraulic oil for the test; A data acquisition system for collecting various signals, including a variety of sensors and an NI-PXI measurement and control system; A test data storage and analysis system for storing and analyzing test data; The servo valve test device body, the oil supply system, the data acquisition system, and the test data storage and analysis system are integrated on a digital test bench.

2. The direct detection type partial deflection plate micro-displacement characteristic test bench according to claim 1, characterized in that: The servo valve test device body is set as a deflected jet servo valve. A laser displacement meter (3) is connected to one side of the deflected jet servo valve. The electromagnetic motor is disassembled to expose the armature assembly. The armature assembly is connected to a high-precision electric push rod (1) through a mechanical connection structure. The high-precision electric push rod (1) can give the armature a controllable deflection angle; A light passing hole for directly detecting micro displacement is opened at a suitable position of the deflected jet servo valve to directly detect the micro displacement of the deflector plate; Micro holes are opened for embedding thermocouples to detect the temperature near the deflector plate.

3. The direct detection type partial deflection plate micro-displacement characteristic test bench according to claim 1, characterized in that: The oil supply system includes a hydraulic oil tank (5), a filter (6), a liquid level gauge (7), a liquid temperature gauge (8), a relief valve (9), a hydraulic pump (10), a back pressure valve (11), a flow sensor (12), an accumulator (13), a pressure sensor (14), and a throttle valve (15); The hydraulic oil tank (5) is used to store the hydraulic oil required for the test; The suction port of the hydraulic pump (10) is connected to the hydraulic oil tank (5) through the filter (6) to suck in the oil. After the oil is stabilized by the accumulator (13) and the flow rate is adjusted by the flow control valve, it is connected to the servo valve inlet through a pipeline; The oil returned from the servo valve return port passes through the back pressure valve (11) and the return oil filter (6) and then returns to the hydraulic oil tank (5) through a pipeline; ​ ​ 4. The direct detection type partial deflection plate micro-displacement characteristic test bench according to claim 1, characterized in that: ​ ​ ​ ​ ​ ​ 5. The direct detection type partial deflection plate micro-displacement characteristic test bench according to claim 1, characterized in that: ​ ​ The test data analysis module has functions of data preprocessing, feature extraction, and statistical analysis, and is used to comprehensively analyze test data.

6. A test method for the micro-displacement characteristics of a direct detection type deflecting plate, which is applied to the test bench for the micro-displacement characteristics of the direct detection type deflecting plate according to any one of claims 1-5, and is characterized in that: It includes the following steps: S1. Equipment layout: Arrange the test bench, computer, and NI-PXI measurement and control system at appropriate positions in the laboratory to prepare for subsequent test operations; S2. Installation and testing of the oil supply system: Strictly connect the hydraulic oil tank (5), filter (6), liquid level gauge (7), liquid temperature gauge (8), overflow valve (9), hydraulic pump (10), back pressure valve (11), flow sensor (12), accumulator (13), pressure sensor (14), and throttle valve (15) in sequence according to the hydraulic schematic diagram and assembly drawings of the oil supply system; Connect the flow sensor (12) and pressure sensor (14) to the data acquisition card in the NI-PXI measurement and control system with cables, and at the same time connect the measurement and control system and the computer; Temporarily connect the oil outlet and the oil return port, add an appropriate amount of clean hydraulic oil into the hydraulic oil tank (5), power on the motor and start the hydraulic pump (10), adjust the hydraulic valve, and test whether the oil supply system operates normally without faults and whether the measurements of the flow sensor (12) and pressure sensor (14) are accurate; If there is no fault and the sensor measurements are normal, stop the machine and unload the load, disassemble the temporary oil pipe, place the oil supply system under the test bench surface, perform sound insulation and vibration isolation treatment, and then connect the oil outlet and the oil return port to the hydraulic connection plate of the test bench according to the correct oil ports; S3. Installation of the servo valve test device body: Install the processed servo valve test device body on the hydraulic connection plate of the test bench surface to ensure firm installation and accurate position; S4. Sensor installation and cable connection: According to the position of the servo valve armature, use a fixture to adjust the installation position of the electric push rod (1) so that it just touches one end of the electric push rod (1); According to the position of the light passing hole, use a fixture to adjust the installation position of the laser displacement sensor (4) so that its measurement laser light path is on the axis of the light passing hole; According to the position of the servo valve spool valve core, use a fixture to adjust the installation position of the contact displacement sensor (4) so that its measurement straight line and the axis of the spool valve core are on the same straight line; Embed and fix the implanted thermocouple (2) in the micro-hole of the valve body; Connect the cables of the above sensors to the data acquisition card, and arrange and organize the cables in the test bench; S5. End of the test: After completing the above operations, end the test process.

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