High-precision test bed and test method for micro-scale static characteristics of zero region of slide valve pair

Abstract

The invention belongs to the technical field of slide valve pair zero-zone micro-scale static characteristic testing, and provides a slide valve pair zero-zone micro-scale static characteristic high-precision test bed and a test method.The slide valve pair zero-zone micro-scale static characteristic high-precision test bed comprises an ultra-precision slide valve pair mounting table and a slide valve pair static characteristic hydraulic testing system; by selecting a control element and a detection element which can measure and control the flow, the pressure and the temperature in a high-precision and precise manner, and combining an innovatively developed test subprogram, an intelligent data processing algorithm and a test model machine learning algorithm, the measurement precision, the test result confidence coefficient and the measurement efficiency are improved; according to the test bed, based on a hydraulic test system for the micro-scale static characteristics of the zero region of the slide valve pair, a control element and a detection element which can measure and control the flow, the pressure and the temperature in a high-precision and accurate manner are carefully selected, and the micro-scale static characteristic measurement under different flow, pressure and temperature of the zero region of the slide valve pair can be comprehensively and accurately simulated.

Description

Technical Field

[0001] The present invention belongs to the technical field of slide valve auxiliary zero zone micro-scale static characteristic testing, and in particular relates to a slide valve auxiliary zero zone micro-scale static characteristic high-precision test bench and a test method. Background Art

[0002] The spool valve pair is the most critical component in the power stage of a deflector jet servo valve. Its operating principle is to receive a pressure signal from the pre-stage and, leveraging the pressure differential across the valve core, generate axial movement within the valve sleeve. This in turn changes the flow area formed by the spool and the throttling edge of the sleeve, thereby achieving precise control of hydraulic oil flow and pressure. This characteristic has led to its widespread application in numerous fields, including aviation, aerospace, shipbuilding, chemical engineering, and metallurgy. The cylindrical spool valve is currently the most commonly used type of spool valve.

[0003] The dynamic and static quality of the spool valve pair significantly impacts the overall servo valve performance. Because the static characteristics of a servo valve depend on the manufacturing precision of microscopic features such as the spool valve's throttling working edge and its overlap, stringent requirements are placed on the manufacturing accuracy and dimensional tolerances of the spool valve pair. These include the radial clearance between the valve core and the valve sleeve, the axial overlap, and the size, shape, and relative position of the throttling working edge. However, the servo valve's power stage is complex, with numerous oil passage holes and intersecting holes in the housing. This makes sealing difficult and prone to leakage, posing significant measurement challenges. Direct measurement of the internal microstructure is difficult without destroying the structure. Therefore, designing a zero-zone microscale static characteristic hydraulic test bench for the spool valve pair to obtain static characteristics under different microscopic features, and then indirectly inferring the internal microscopic feature dimensions of the spool valve pair through these static characteristics, has become an important research direction.

[0004] Static characteristics can fully describe the working performance and working capacity of the slide valve itself, and are also of vital importance for the static and dynamic characteristics analysis of hydraulic control systems. In engineering practice, flow characteristic curves, pressure characteristic curves, and internal leakage characteristic curves are usually used to intuitively display the static characteristics of the slide valve. However, existing servo valve power level static characteristic tests have many limitations. On the one hand, the impact of microscopic dimensions on the test results is not fully considered, and the accuracy of reverse deducing microscopic dimensions through static characteristics is low; on the other hand, the single test sample leads to low confidence in the results, making it impossible to deeply explore the microscale static characteristics of the power level zero zone, and it is difficult to accurately obtain microscopic features through traditional static characteristic curves, which cannot meet the current growing research and development needs.

[0005] Although some experiments on the static characteristics of the auxiliary zero zone of sliding valves have been carried out at home and abroad, most of them are based on the traditional sharp-edged throttle flow pressure and load flow pressure equations, which make it difficult to reveal the influence of microscopic characteristics; and in traditional experimental research, data processing and analysis have problems such as time-consuming, inefficient and low precision, making it difficult to quickly and effectively obtain and utilize experimental data. Therefore, a high-precision test bench and test method for the micro-scale static characteristics of the auxiliary zero zone of sliding valves are needed to solve the above problems. Summary of the Invention

[0006] The object of the present invention is to provide a high-precision test bench and test method for micro-scale static characteristics of a sliding valve sub-zero zone, so as to solve the problems raised in the above-mentioned background technology.

[0007] To achieve the above-mentioned objectives, the present invention provides the following technical solutions: a high-precision test bench for the micro-scale static characteristics of the sliding valve sub-zero zone, including an ultra-precision sliding valve sub-mounting platform and a hydraulic test system for the static characteristics of the sliding valve sub-mount, and by selecting control elements and detection elements that can measure and control flow, pressure and temperature with high precision and accuracy, combined with innovatively developed test subroutines and intelligent data processing algorithms, and test model machine learning algorithms, to improve measurement accuracy, test result confidence and measurement efficiency.

[0008] A further technical solution is that the ultra-precision sliding valve auxiliary mounting platform includes an ultra-precision valve core position sensor, a sliding valve auxiliary overlap adjustment device, an implantable temperature and pressure detection system, a mounting platform deformation monitoring system, a valve sleeve, a valve core and a three-coordinate measuring instrument; the three-coordinate measuring instrument is used to measure the size of the valve sleeve oil groove and the valve core shoulder; the valve core position adjustment device is used to adjust the valve core to the center position; the ultra-precision valve core position sensor is used for calibration; the microscopic characteristics are measured by combining the above components with the test procedure, and then the sliding valve auxiliary static characteristics hydraulic test system is connected and started.

[0009] A further technical solution is that the hydraulic test system for the static characteristics of the sliding valve pair includes an oil tank, a cooling overflow valve, a cooling circulation pump, a cooling circulation pump motor, a cooling check valve, a cooling filter, a radiator, two pressure gauges, six thermometers, a main system safety valve, an oil suction filter, a main system motor, a main system pump, a stop valve, an accumulator, a pressure oil filter, seven two-position two-way solenoid ball valves, three flow sensors, four pressure sensors, a displacement sensor, a micro-feed platform, a check valve, a heater, an air filter, an electromagnetic proportional overflow valve and three throttle valves. The oil tank is connected to the cooling overflow valve, the cooling circulation pump, the thermometer, the main system safety valve, the oil suction filter, the two-position two-way electromagnetic ball valve, the heater, the air filter, the electromagnetic proportional overflow valve and the throttle valve. The heater and the thermometer are coordinated and installed in the oil tank or the oil circulation pipeline to change the oil temperature; the air filter maintains the air pressure balance.

[0010] A further technical solution is that the cooling overflow valve and the outlet pipeline of the cooling circulation pump control the pressure of the cooling circulation system; the cooling overflow valve is connected to the cooling check valve, the cooling circulation pump is connected to the cooling circulation pump motor and the cooling check valve, the cooling check valve is connected to the cooling filter, the cooling filter is connected to the radiator, the cooling circulation pump is driven by the cooling circulation pump motor, and the cooling circulation loop formed by the cooling check valve, the cooling filter, and the radiator regulates the oil temperature;

[0011] The radiator is connected to the pressure gauge, which is connected to the thermometer; the main system safety valve is connected to the pressure gauge and the shut-off valve, which is connected to the accumulator, the pressure gauge is connected to the main system pump and the one-way valve, and the oil suction filter is connected to the main system pump to provide hydraulic oil to the system.

[0012] According to a further technical solution, the main system pump is connected to the main system motor, and the one-way valve is connected to the oil pressure filter, and the one-way valve prevents oil from flowing back;

[0013] The oil pressure filter and the electromagnetic proportional relief valve are both connected to the flow sensor, and the electromagnetic proportional relief valve is connected to the branch of the main system pump oil outlet pipeline to control the system pressure;

[0014] The flow sensor is connected to the thermometer, the thermometer is connected to the pressure sensor, the pressure sensor is connected to the two-position two-way electromagnetic ball valve and the two-position two-way electromagnetic ball valve, the two-position two-way electromagnetic ball valve and the two-position two-way electromagnetic ball valve are connected to the ultra-precision slide valve sub-mounting platform through a pipeline, the ultra-precision slide valve sub-mounting platform is connected to the displacement sensor to measure the valve core displacement, the ultra-precision slide valve sub-mounting platform is connected to the micro-feed platform to fine-tune the valve core position.

[0015] A further technical solution is that the ultra-precision slide valve sub-mounting platform is connected to a thermometer and a pressure sensor through a pipeline, the ultra-precision slide valve sub-mounting platform is connected to the temperature sensor and the pressure sensor through a pipeline, the thermometer and the pressure sensor are connected to a two-position two-way electromagnetic ball valve through a flow sensor, and the flow sensor and the pressure sensor are installed on the pipeline close to the ultra-precision slide valve sub-mounting platform to monitor the flow and pressure;

[0016] The flow sensor and the two-position two-way electromagnetic ball valve are respectively connected to the two ends of the throttle valve, the two-position two-way electromagnetic ball valve and the throttle valve are connected to the two-position two-way electromagnetic ball valve and the two-position two-way electromagnetic ball valve, the two-position two-way electromagnetic ball valve is connected to the two-position two-way electromagnetic ball valve and the throttle valve through the two-position two-way electromagnetic ball valve, the throttle valve is connected to the two-position two-way electromagnetic ball valve and the flow sensor, the two-position two-way electromagnetic ball valve and the flow sensor are connected to the temperature sensor and the pressure sensor, the ultra-precision slide valve sub-mounting platform, the two-position two-way electromagnetic ball valve and the two-position two-way electromagnetic ball valve are connected to the pressure sensor and connected to a thermometer. The pressure sensor and the thermometer are connected to the throttle valve through a flow sensor. The throttle valve is installed on the pipeline to control the system flow, and static characteristic tests under different pressure, flow and temperature conditions are carried out together to obtain high-precision micro-scale static characteristic indicators. The pressure gauge is installed in key node pipelines such as the main system pump oil outlet and the overflow valve outlet to display the pressure value of the corresponding position in real time. The two ends of the two-position two-way electromagnetic ball valve are respectively connected to the main system pump oil outlet pipeline and the ultra-precision slide valve sub-mounting platform oil inlet through high-pressure oil pipes to control the oil supply on and off of the ultra-precision slide valve sub-mounting platform.

[0017] In a further technical solution, the cooling circulation pump is connected to the cooling one-way valve, the cooling filter, and the radiator in sequence to form a cooling circulation path;

[0018] The main system safety valve is connected in parallel on the pipeline between the main system pump oil outlet and the oil tank to protect the system pressure from being too high.

[0019] A high-precision test method for micro-scale static characteristics of a spool valve auxiliary zero zone is applied to any of the above-mentioned high-precision test benches for micro-scale static characteristics of a spool valve auxiliary zero zone, comprising the following steps:

[0020] S1. According to the service environment and working conditions of the servo valve, use heaters and thermometers to change the oil temperature, use relief valves to control the system pressure and detect it with a pressure sensor, use throttle valves to control the system flow and monitor it with a flow sensor, adjust the oil temperature, flow rate, pressure and other loads of the test bench, and carry out static characteristic tests under different pressure, flow rate and temperature conditions;

[0021] S2. Use the ultra-precision spool valve sub-mounting platform to verify structural strength and deformation. Install an ultra-precision valve core position sensor, a spool valve sub-lap adjustment device, an implantable temperature and pressure detection system, and a mounting platform deformation monitoring system. Use a three-coordinate measuring machine to measure the valve sleeve diameter and valve core shoulder dimensions. Install the valve sleeve into the spool valve sub-mounting platform. Use the position adjustment device to adjust the valve core to the neutral position. Calibrate the valve core using the ultra-precision valve core position sensor. Combine these two dimensions and use the test procedure to measure the microscopic characteristics of the spool valve sub-zero zone.

[0022] S3. Install the ultra-precision spool valve assembly on a spool valve assembly high-precision static characteristics test bench, and start the spool valve assembly static characteristics hydraulic test system to conduct static characteristics tests under different pressure, flow, and temperature conditions to indirectly obtain the microscopic characteristics of the spool valve assembly zero zone and its impact on the static characteristics;

[0023] S4. The obtained flow-pressure characteristics, pressure characteristics, flow characteristics, and internal leakage characteristic curves are further processed using big data analysis, artificial intelligence, and machine learning technologies. The theoretical model is trained using machine learning and other technologies to improve measurement accuracy, test result confidence, and measurement efficiency, and to achieve intelligent output of static characteristic curves.

[0024] A further technical solution is that in step S1, when adjusting the oil temperature, the heater is installed inside the oil tank or in the oil circulation pipeline, and the oil temperature is fed back in real time through a thermometer to form a closed-loop control system with the heater for temperature adjustment.

[0025] Compared with the prior art, the present invention has the following beneficial effects:

[0026] The present invention can accurately simulate static characteristic tests: the test bench is based on a micro-scale static characteristic hydraulic test system for the zero-zone of a spool valve pair. It carefully selects control components and detection components that can accurately measure and control flow, pressure, and temperature with high precision. These high-precision components can comprehensively and accurately simulate micro-scale static characteristic measurements at different spool valve pair zero-zone flow, pressure, and temperature conditions, providing a reliable testing method for studying the performance of spool valve pairs under various operating conditions.

[0027] The present invention can simulate different micro-feature tests: through the ultra-precision slide valve assembly mounting platform, it can accurately measure the slide valve assembly zero zone micro-features, such as micro-lap, micro-machining fillet, micro-cylindricity and other micro-features. Based on these accurately measured micro-features, it can simulate static characteristic tests under different micro-features, deeply explore the influence of micro-features on the static characteristics of the slide valve assembly, and provide an important theoretical basis for the design and optimization of the slide valve assembly.

[0028] This invention improves measurement efficiency and accuracy by utilizing experimental data for in-depth processing using big data analysis, artificial intelligence, and machine learning techniques. By employing machine learning and other techniques to train theoretical models, measurement accuracy, test result confidence, and efficiency are significantly improved, enabling intelligent output of static characteristic curves. This not only increases the value of experimental data but also provides a more efficient and accurate data analysis tool for slide valve pair research, significantly advancing the field of slide valve pair research. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 This is the schematic diagram of the high-precision hydraulic test system for the slide valve pair.

[0030] In the figure: 1. Oil tank; 2. Cooling overflow valve; 3. Cooling circulation pump; 4. Cooling circulation pump motor; 5. Cooling check valve; 6. Cooling filter; 7. Radiator; 8. Pressure gauge; 9. Thermometer; 10. Main system safety valve; 11. Oil suction filter; 12. Main system motor; 13. Main system pump; 14. Stop valve; 15. Accumulator; 16. Oil pressure filter; 17. Two-position two-way solenoid valve; 18. Flow sensor; 19. Pressure sensor; 20. Displacement sensor; 21. Micro-feed platform; 22. Check valve; 23. Heater; 24. Air filter; 25. Solenoid proportional overflow valve; 26. Throttle valve. DETAILED DESCRIPTION

[0031] The present invention will be further described below with reference to the embodiments.

[0032] The following examples are intended to illustrate the present invention but are not intended to limit the scope of protection of the present invention. The conditions in the examples may be further adjusted according to specific conditions. Simple improvements to the method of the present invention within the scope of the present invention are also within the scope of protection claimed in the present invention.

[0033] See also Figure 1 The present invention provides a high-precision test bench for the micro-scale static characteristics of the zero-zone of a sliding valve pair, including an ultra-precision sliding valve pair mounting platform and a hydraulic test system for the static characteristics of the sliding valve pair. By selecting control elements and detection elements that can measure and control flow, pressure and temperature with high precision and accuracy, combined with innovatively developed test subroutines and intelligent data processing algorithms, and test model machine learning algorithms, the measurement accuracy, test result confidence and measurement efficiency are improved.

[0034] like Figure 1 As shown, a high-precision test bench for the micro-scale static characteristics of the zero zone of a sliding valve auxiliary provided by the present invention, the ultra-precision sliding valve auxiliary mounting platform includes an ultra-precision valve core position sensor, a sliding valve auxiliary overlap adjustment device, an implantable temperature and pressure detection system, a mounting platform deformation monitoring system, a valve sleeve, a valve core and a three-coordinate measuring instrument; the three-coordinate measuring instrument is used to measure the size of the valve sleeve oil groove and the valve core shoulder; the valve core position adjustment device is used to adjust the valve core to the middle position; the ultra-precision valve core position sensor is used for calibration; the microscopic characteristics are measured by combining the above components with the test procedure, and then the hydraulic test system for the static characteristics of the sliding valve auxiliary is connected and started.

[0035] like Figure 1As shown in the figure, a high-precision test bench for micro-scale static characteristics of a slide valve auxiliary zero zone provided by the present invention is provided. The hydraulic test system for the static characteristics of the slide valve auxiliary includes an oil tank 1, a cooling overflow valve 2, a cooling circulation pump 3, a cooling circulation pump motor 4, a cooling check valve 5, a cooling filter 6, a radiator 7, two pressure gauges 8, six thermometers 9, a main system safety valve 10, an oil suction filter 11, a main system motor 12, a main system pump 13, a stop valve 14, an accumulator 15, a pressure oil filter 16, seven two-position two-way electromagnetic ball valves 17, three flow sensors 18, four pressure sensors 19, and a displacement sensor. The oil tank 1 is connected to the cooling overflow valve 2, the cooling circulation pump 3, the thermometer 9, the main system safety valve 10, the oil suction filter 11, the two-position two-way electromagnetic ball valve 17, the two-position two-way electromagnetic ball valve 17, the heater 23, the air filter 24, the electromagnetic proportional overflow valve 25 and the throttle valve 26. The heater 23 cooperates with the thermometer 9 and is installed in the oil tank 1 or the oil circulation pipeline to change the oil temperature; the air filter 24 maintains the air pressure balance.

[0036] like Figure 1 As shown, a high-precision test bench for micro-scale static characteristics of a sliding valve sub-zero zone provided by the present invention is provided. The outlet pipeline of the cooling overflow valve 2 and the cooling circulation pump 3 controls the pressure of the cooling circulation system; the cooling overflow valve 2 is connected to the cooling check valve 5, the cooling circulation pump 3 is connected to the cooling circulation pump motor 4 and the cooling check valve 5, the cooling check valve 5 is connected to the cooling filter 6, the cooling filter 6 is connected to the radiator 7, the cooling circulation pump 3 is driven by the cooling circulation pump motor 4, and the cooling check valve 5, the cooling filter 6, and the radiator 7 form a cooling circulation loop to regulate the oil temperature;

[0037] The radiator 7 is connected to the pressure gauge 8, which is connected to the thermometer 9; the main system safety valve 10 is connected to the pressure gauge 8 and the stop valve 14, the stop valve 14 is connected to the accumulator 15, the pressure gauge 8 is connected to the main system pump 13 and the one-way valve 22, and the oil suction filter 11 is connected to the main system pump 13 to provide hydraulic oil for the system.

[0038] like Figure 1 As shown, a high-precision test bench for micro-scale static characteristics of a sliding valve auxiliary zero zone provided by the present invention is provided. The main system pump 13 is connected to the main system motor 12, and the one-way valve 22 is connected to the oil pressure filter 16. The one-way valve 22 prevents oil from flowing back.

[0039] The oil pressure filter 16 and the electromagnetic proportional relief valve 25 are both connected to the flow sensor 18. The electromagnetic proportional relief valve 25 is connected to the branch of the oil outlet pipeline of the main system pump 13 to control the system pressure.

[0040] The flow sensor 18 is connected to the thermometer 9, the thermometer 9 is connected to the pressure sensor 19, the pressure sensor 19 is connected to the two-position two-way electromagnetic ball valve 17 and the two-position two-way electromagnetic ball valve 17, the two-position two-way electromagnetic ball valve 17 and the two-position two-way electromagnetic ball valve 17 are connected to the ultra-precision slide valve sub-mounting platform through pipelines, the ultra-precision slide valve sub-mounting platform is connected to the displacement sensor 20 to measure the valve core displacement, and the ultra-precision slide valve sub-mounting platform is connected to the micro-feed platform 21 to fine-tune the valve core position.

[0041] like Figure 1 As shown, a high-precision test bench for micro-scale static characteristics of a slide valve auxiliary zero zone provided by the present invention is provided. The ultra-precision slide valve auxiliary mounting platform is connected to a thermometer 9 and a pressure sensor 19 via a pipeline. The ultra-precision slide valve auxiliary mounting platform is connected to the temperature sensor 9 and the pressure sensor 19 via a pipeline. The thermometer 9 and the pressure sensor 19 are connected to a two-position two-way electromagnetic ball valve 17 via a flow sensor 18. The flow sensor 18 and the pressure sensor 19 are installed on the pipeline close to the ultra-precision slide valve auxiliary mounting platform to monitor the flow and pressure.

[0042] The flow sensor 18 and the two-position two-way electromagnetic ball valve 17 are respectively connected to the two ends of the throttle valve 26, the two-position two-way electromagnetic ball valve 17 and the throttle valve 26 are connected to the two-position two-way electromagnetic ball valve 17 and the two-position two-way electromagnetic ball valve 17, the two-position two-way electromagnetic ball valve 17 is connected to the two-position two-way electromagnetic ball valve 17 and the throttle valve 26 through the two-position two-way electromagnetic ball valve 17, the throttle valve 26 is connected to the two-position two-way electromagnetic ball valve 17 and the flow sensor 18, the two-position two-way electromagnetic ball valve 17 and the flow sensor 18 are connected to the temperature sensor 9 and the pressure sensor 19, the ultra-precision slide valve auxiliary mounting table, the two-position two-way electromagnetic ball valve 17 and the two-position two-way electromagnetic ball valve 1 7 is connected to the pressure sensor 19 and the thermometer 9, and the pressure sensor 19 and the thermometer 9 are connected to the throttle valve 26 through the flow sensor 18. The throttle valve 26 is installed on the pipeline to control the system flow, and jointly carry out static characteristic tests under different pressure, flow and temperature conditions to obtain high-precision micro-scale static characteristic indicators. The pressure gauge 8 is installed in the key node pipelines such as the oil outlet of the main system pump 13 and the overflow valve outlet to display the pressure value of the corresponding position in real time. The two ends of the two-position two-way electromagnetic ball valve 17 are respectively connected to the oil outlet pipeline of the main system pump 13 and the oil inlet of the ultra-precision slide valve auxiliary mounting platform through high-pressure oil pipes to control the oil supply on and off of the ultra-precision slide valve auxiliary mounting platform.

[0043] like Figure 1 As shown, a high-precision test bench for micro-scale static characteristics of a sliding valve auxiliary zero zone provided by the present invention is provided, wherein a cooling circulation pump 3 is connected in sequence with a cooling check valve 5, a cooling filter 6, and a radiator 7 to form a cooling circulation path;

[0044] The main system safety valve 10 is connected in parallel on the pipeline between the oil outlet of the main system pump 13 and the oil tank 1 to protect the system pressure from being too high.

[0045] A high-precision test method for micro-scale static characteristics of a spool valve auxiliary zero zone is applied to the high-precision test bench for micro-scale static characteristics of a spool valve auxiliary zero zone of the above embodiment, comprising the following steps:

[0046] S1. Based on the servo valve's service environment and working conditions, the oil temperature is changed using heater 23 and thermometer 9. The system pressure is controlled by the relief valve and detected by pressure sensor 19. The system flow is controlled by throttle valve 26 and monitored by flow sensor 18. The oil temperature, flow rate, and pressure loads of the test bench are adjusted to conduct static characteristic tests under different pressure, flow rate, and temperature conditions.

[0047] S2. Use the ultra-precision spool valve sub-mounting platform to verify structural strength and deformation. Install an ultra-precision valve core position sensor, a spool valve sub-lap adjustment device, an implantable temperature and pressure detection system, and a mounting platform deformation monitoring system. Use a three-coordinate measuring machine to measure the valve sleeve diameter and valve core shoulder dimensions. Install the valve sleeve into the spool valve sub-mounting platform. Use the position adjustment device to adjust the valve core to the neutral position. Calibrate the valve core using the ultra-precision valve core position sensor. Combine these two dimensions and use the test procedure to measure the microscopic characteristics of the spool valve sub-zero zone.

[0048] S3. Install the ultra-precision spool valve assembly on a spool valve assembly high-precision static characteristics test bench, and start the spool valve assembly static characteristics hydraulic test system to conduct static characteristics tests under different pressure, flow, and temperature conditions to indirectly obtain the microscopic characteristics of the spool valve assembly zero zone and its impact on the static characteristics;

[0049] S4. The obtained flow-pressure characteristics, pressure characteristics, flow characteristics, and internal leakage characteristic curves are further processed using big data analysis, artificial intelligence, and machine learning technologies. The theoretical model is trained using machine learning and other technologies to improve measurement accuracy, test result confidence, and measurement efficiency, and to achieve intelligent output of static characteristic curves.

[0050] like Figure 1 As shown, a high-precision test bench for micro-scale static characteristics of the secondary zero zone of a sliding valve provided by the present invention is provided. In step S1, when adjusting the oil temperature, the heater 23 is installed inside the oil tank 1 or in the oil circulation pipeline, and the oil temperature is fed back in real time through the thermometer 9, forming a closed-loop control system with the heater 23 for temperature adjustment.

[0051] 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 high-precision test bench for micro-scale static characteristics of the slide valve auxiliary zero zone, characterized in that: It includes an ultra-precision sliding valve sub-mounting platform and a sliding valve sub-static characteristic hydraulic test system. By selecting control elements and detection elements that can measure and control flow, pressure and temperature with high precision and accuracy, combined with innovatively developed test subroutines and intelligent data processing algorithms, and test model machine learning algorithms, it can improve measurement accuracy, test result confidence and measurement efficiency.

2. The high-precision test bench for micro-scale static characteristics of the slide valve auxiliary zero zone according to claim 1 is characterized by: The ultra-precision slide valve sub-mounting platform includes an ultra-precision valve core position sensor, a slide valve sub-lap adjustment device, an implantable temperature and pressure detection system, a mounting platform deformation monitoring system, a valve sleeve, a valve core, and a three-coordinate measuring instrument; the three-coordinate measuring instrument is used to measure the size of the valve sleeve oil groove and the valve core shoulder; The valve core position adjustment device is used to adjust the valve core to the middle position; the ultra-precision valve core position sensor is used for calibration; the microscopic characteristics are measured by combining the above components with the test procedure, and then the hydraulic test system for the static characteristics of the sliding valve pair is connected and opened.

3. The high-precision test bench for micro-scale static characteristics of the spool valve auxiliary zero zone according to claim 1 is characterized by: The hydraulic test system for static characteristics of the sliding valve pair comprises an oil tank (1), a cooling overflow valve (2), a cooling circulation pump (3), a cooling circulation pump motor (4), a cooling check valve (5), a cooling filter (6), a radiator (7), two pressure gauges (8), six thermometers (9), a main system safety valve (10), an oil suction filter (11), a main system motor (12), a main system pump (13), a stop valve (14), an accumulator (15), a pressure oil filter (16), seven two-position two-way electromagnetic ball valves (17), three flow sensors (18), four pressure sensors (19), a displacement sensor (20), a micro-feeding platform (21), a check valve ( 22), heater (23), air filter (24), electromagnetic proportional relief valve (25) and three throttle valves (26); the oil tank (1) is connected with the cooling relief valve (2), cooling circulation pump (3), thermometer (9), thermometer (9), main system safety valve (10), oil suction filter (11), two-position two-way electromagnetic ball valve (17), two-position two-way electromagnetic ball valve (17), heater (23), air filter (24), electromagnetic proportional relief valve (25) and throttle valve (26); the heater (23) cooperates with the thermometer (9) and is installed in the oil tank (1) or the oil circulation pipeline to change the oil temperature; the air filter (24) maintains air pressure balance.

4. The high-precision test bench for micro-scale static characteristics of the spool valve auxiliary zero zone according to claim 3 is characterized by: The cooling overflow valve (2) and the outlet pipeline of the cooling circulation pump (3) control the pressure of the cooling circulation system; the cooling overflow valve (2) is connected to the cooling check valve (5), the cooling circulation pump (3) is connected to the cooling circulation pump motor (4) and the cooling check valve (5), the cooling check valve (5) is connected to the cooling filter (6), the cooling filter (6) is connected to the radiator (7), the cooling circulation pump (3) is driven by the cooling circulation pump motor (4), and the cooling circulation loop is formed through the cooling check valve (5), the cooling filter (6), and the radiator (7) to regulate the oil temperature; The radiator (7) is connected to a pressure gauge (8), which is connected to a thermometer (9); the main system safety valve (10) is connected to the pressure gauge (8) and a stop valve (14), which is connected to an accumulator (15); the pressure gauge (8) is connected to a main system pump (13) and a one-way valve (22); and the oil suction filter (11) is connected to the main system pump (13) to provide hydraulic oil for the system.

5. The high-precision test bench for micro-scale static characteristics of the slide valve auxiliary zero zone according to claim 4 is characterized by: The main system pump (13) is connected to the main system motor (12), and the one-way valve (22) is connected to the oil pressure filter (16). The one-way valve (22) prevents oil from flowing back. The oil pressure filter (16) and the electromagnetic proportional relief valve (25) are both connected to the flow sensor (18), and the electromagnetic proportional relief valve (25) is connected to the branch of the oil outlet pipeline of the main system pump (13) to control the system pressure; The flow sensor (18) is connected to the thermometer (9), the thermometer (9) is connected to the pressure sensor (19), the pressure sensor (19) is connected to the two-position two-way electromagnetic ball valve (17) and the two-position two-way electromagnetic ball valve (17), the two-position two-way electromagnetic ball valve (17) and the two-position two-way electromagnetic ball valve (17) are connected to the ultra-precision slide valve sub-mounting platform through a pipeline, the ultra-precision slide valve sub-mounting platform is connected to the displacement sensor (20) to measure the displacement of the valve core, and the ultra-precision slide valve sub-mounting platform is connected to the micro-feed platform (21) to fine-tune the valve core position.

6. The high-precision test bench for micro-scale static characteristics of the slide valve auxiliary zero zone according to claim 5 is characterized by: The ultra-precision slide valve sub-mounting platform is connected to the temperature sensor (9) and the pressure sensor (19) through a pipeline. The ultra-precision slide valve sub-mounting platform is connected to the temperature sensor (9) and the pressure sensor (19) through a pipeline. The thermometer (9) and the pressure sensor (19) are connected to the two-position two-way electromagnetic ball valve (17) through a flow sensor (18). The flow sensor (18) and the pressure sensor (19) are installed on the pipeline close to the ultra-precision slide valve sub-mounting platform to monitor the flow rate and pressure. The flow sensor (18) and the two-position two-way electromagnetic ball valve (17) are respectively connected to the two ends of the throttle valve (26), the two-position two-way electromagnetic ball valve (17) and the throttle valve (26) are connected to the two-position two-way electromagnetic ball valve (17) and the two-position two-way electromagnetic ball valve (17), the two-position two-way electromagnetic ball valve (17) is connected to the two-position two-way electromagnetic ball valve (17) and the throttle valve (26) through the two-position two-way electromagnetic ball valve (17), the throttle valve (26) is connected to the two-position two-way electromagnetic ball valve (17) and the flow sensor (18), the two-position two-way electromagnetic ball valve (17) and the flow sensor (18) are connected to the temperature sensor (9) and the pressure sensor (19), the ultra-precision slide valve auxiliary mounting platform, the two-position two-way electromagnetic ball valve (17) The two-position two-way electromagnetic ball valve (17) is connected to a pressure sensor (19) and a thermometer (9), and the pressure sensor (19) and the thermometer (9) are connected to a throttle valve (26) through a flow sensor (18). The throttle valve (26) is installed on the pipeline to control the system flow, and static characteristic tests under different pressure, flow and temperature conditions are carried out together to obtain high-precision micro-scale static characteristic indicators. The pressure gauge (8) is installed at the oil outlet of the main system pump (13), the overflow valve outlet and other key node pipelines to display the corresponding position pressure value in real time. The two ends of the two-position two-way electromagnetic ball valve (17) are respectively connected to the oil outlet pipeline of the main system pump (13) and the oil inlet of the ultra-precision slide valve auxiliary mounting platform through high-pressure oil pipes to control the oil supply on and off of the ultra-precision slide valve auxiliary mounting platform.

7. The high-precision test bench for micro-scale static characteristics of the slide valve auxiliary zero zone according to claim 6 is characterized by: The cooling circulation pump (3) is connected to the cooling one-way valve (5), the cooling filter (6), and the radiator (7) in sequence to form a cooling circulation path; The main system safety valve (10) is connected in parallel to the pipeline between the oil outlet of the main system pump (13) and the oil tank (1) to protect the system pressure from being too high.

8. A high-precision test method for micro-scale static characteristics of a spool valve auxiliary zero zone, applied to the high-precision test bench for micro-scale static characteristics of a spool valve auxiliary zero zone according to any one of claims 1 to 7, characterized in that: The following steps are involved: S1. According to the service environment of the servo valve, the oil temperature is changed by using a heater (23) and a thermometer (9), the system pressure is controlled by using a relief valve and detected by a pressure sensor (19), the system flow is controlled by using a throttle valve (26) and monitored by a flow sensor (18), and the oil temperature, flow rate and pressure of the test bench are adjusted to carry out static characteristic tests under different pressure, flow rate and temperature conditions; S2. Use the ultra-precision spool valve sub-mounting platform to verify structural strength and deformation. Install an ultra-precision valve core position sensor, a spool valve sub-lap adjustment device, an implantable temperature and pressure detection system, and a mounting platform deformation monitoring system. Use a three-coordinate measuring machine to measure the valve sleeve diameter and valve core shoulder dimensions. Install the valve sleeve into the spool valve sub-mounting platform. Use the position adjustment device to adjust the valve core to the neutral position. Calibrate the valve core using the ultra-precision valve core position sensor. Combine these two dimensions and use the test procedure to measure the microscopic characteristics of the spool valve sub-zero zone. S3. Install the ultra-precision spool valve assembly on a spool valve assembly high-precision static characteristics test bench, and start the spool valve assembly static characteristics hydraulic test system to conduct static characteristics tests under different pressure, flow, and temperature conditions to indirectly obtain the microscopic characteristics of the spool valve assembly zero zone and its impact on the static characteristics; S4. The obtained flow-pressure characteristics, pressure characteristics, flow characteristics, and internal leakage characteristic curves are further processed using big data analysis, artificial intelligence, and machine learning technologies. The theoretical model is trained using machine learning and other technologies to improve measurement accuracy, test result confidence, and measurement efficiency, and to achieve intelligent output of static characteristic curves.

9. The high-precision test method for micro-scale static characteristics of a spool valve secondary zero zone according to claim 8, characterized in that: In step S1, when adjusting the oil temperature, the heater (23) is installed inside the oil tank (1) or in the oil circulation pipeline, and the oil temperature is fed back in real time through the thermometer (9), forming a closed-loop control system with the heater (23) to adjust the temperature.

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