Simulation test system and method for leakage characteristics of wide speed ratio internal curve motor flow pair

Abstract

The present invention discloses a simulation test system and method for leakage characteristics of a wide speed ratio internal curve motor distribution pair, the system comprising three parts: an electronic control system, a drive system and a hydraulic system. The electronic control system controls the sensors in the test system to perform data acquisition and processing and data storage; the drive system drives the rotating component through the simulated working condition speed input in real time by the electronic control system; the hydraulic system adjusts the pressure control valve through the pressure signal input of the electronic control system, and uses the fuzzy control PID algorithm to simulate the flow of pressure oil in real working conditions in real time; the leakage characteristics of the distribution pair are obtained by monitoring and evaluating the simulation effect and analyzing the collected data. The present invention obtains the lubrication leakage characteristics of the distribution pair of the internal curve hydraulic motor under real working conditions by simulating the real operating conditions of the distribution pair, innovatively simulates the actual application conditions of the internal curve motor to observe the lubrication characteristics of the distribution pair, guides the low leakage and leakage fluctuation design of the distribution pair, and thus improves the wide speed ratio of the internal curve motor.

Description

Technical Field

[0001] The invention belongs to the technical field of internal curve hydraulic motors, and in particular relates to a system and method for simulating and testing leakage characteristics of a flow distribution pair of a wide speed ratio internal curve motor. Background Art

[0002] Due to its extremely low-speed stability, the inner-curve hydraulic motor is widely used in the rotary drive system of high-end equipment such as ships and special equipment. There are many factors that affect the speed stability, such as the motion law of the force transmission component, the nonlinear friction torque of the friction pair, and the leakage and leakage fluctuation of the friction pair. Among them, the leakage characteristics of the friction pair directly affect the extremely low-speed stability of the inner-curve motor. Especially under extremely low-speed conditions, the required hydraulic system provides very little oil. If the leakage of the friction pair is large, no oil will be transmitted to the moving component. At this time, the hydraulic motor will not be able to rotate. Among the many friction pairs of the inner-curve hydraulic motor, the distribution pair is the friction pair with the highest relative leakage ratio. At the same time, the pressure shock generated during the high-low pressure switching process also has a great influence on the leakage fluctuation. Therefore, the ability to accurately measure the leakage characteristics of the distribution pair is of great significance to improving the wide speed ratio application range of the motor.

[0003] However, as the friction pair interface, the leakage performance of the distribution pair is greatly affected by the operating conditions, design parameters, stress state, etc. The existing leakage characteristic test of the distribution pair of the inner curve hydraulic motor does not strictly simulate the actual operating conditions of the distribution pair, such as pressure, speed and fluid temperature. On the one hand, the setting of pressure and speed is divorced from the actual application conditions. During actual use, the pressure and speed are not constant conditions, but are changed according to the working characteristics of the driving load. On the other hand, it is difficult to maintain a stable input of pressure when setting the pressure, especially under extremely low speed and ultra-high pressure conditions. The change of pressure has a great impact on the flow input. Therefore, the present invention proposes a simulation test system for the leakage characteristics of the distribution pair of the wide speed ratio inner curve motor, which can simulate the leakage characteristics of the distribution pair of the inner curve hydraulic motor under real working conditions. Summary of the invention

[0004] The purpose of the present invention is to address the deficiencies in the prior art and to provide a system and method for simulating the leakage characteristics of a wide speed ratio internal curve motor distribution pair.

[0005] The object of the present invention is achieved through the following technical scheme: a simulation test system for leakage characteristics of a wide speed ratio internal curve motor distribution pair, the system comprising: a drive system, a hydraulic system and an electronic control system;

[0006] The drive system includes a servo controller, a servo motor, a speed sensor and a torque sensor; the servo motor is connected to the electronic control system through the servo controller; the servo motor is used to control the rotation speed of the cylinder in the distribution pair, and the speed sensor and the torque sensor are used to detect the rotation speed and torque of the cylinder and feed back to the electronic control system;

[0007] The hydraulic system includes a first hydraulic pump, a second hydraulic pump, a first pressure control valve, a second pressure control valve and a pressure-temperature sensor driven by a motor; the first hydraulic pump is used to supply oil to the high-pressure chamber and the loading chamber of the distribution pair, and a first pressure control valve is arranged on the oil circuit to adjust the pressure in the high-pressure chamber and the loading chamber to simulate the actual stress state of the inner curve motor under different working conditions of the distribution pair; the second hydraulic pump is used to supply oil to the housing of the distribution pair so that the housing is filled with oil, and a second pressure control valve is arranged on the oil circuit to adjust the pressure in the housing of the distribution pair to simulate the working environment of the distribution pair under different working conditions; a flow sensor is arranged on the oil return line of the housing to measure the leakage flow of the distribution pair; the pressure-temperature sensor is used to detect the pressure and temperature in the high-pressure chamber, the loading chamber and the housing of the distribution pair, and feed back to the electronic control system;

[0008] The electronic control system is used to control the rotation speed of the servo motor through the servo controller according to the rotation speed and torque of the cylinder body; to feedback-regulate the first pressure control valve according to the pressure and temperature in the high-pressure chamber and the loading chamber, and to feedback-regulate the second pressure control valve according to the pressure and temperature in the housing of the distribution pair.

[0009] Furthermore, the hydraulic system transfers the oil in the first oil tank to the distribution secondary high-pressure chamber and the loading chamber through the first hydraulic pump via the one-way valve, the high-pressure filter and the two-position four-way reversing valve.

[0010] Furthermore, when the two-position four-way reversing valve is switched to the left passage, the oil in the left passage will flow into the high-pressure chamber of the distribution pair, and the high-pressure chamber is used to simulate the oil supply pressure of the distribution pair under different working conditions; when the two-position four-way reversing valve is switched to the right passage, the oil in the right passage will flow into the loading chamber of the distribution pair, and the loading chamber is used to control the loading force generated by the pressure of the oil in the chamber to be equivalent to the clamping force of the distribution pair, simulate the actual stress state of the distribution pair in the inner curve motor, and realize the calibration of the friction torque of the transmission system in the distribution pair device.

[0011] Furthermore, the hydraulic system uses the second hydraulic pump to flow the oil in the second oil tank through the second filter, the cooler and the fourth switch valve into the distribution sub-housing.

[0012] Furthermore, a third switch valve is arranged on the oil return line of the distribution sub-housing; the fourth switch valve is used to input the oil into the distribution sub-housing in one direction, at which time the third switch valve is closed and the fourth switch valve is opened, and when the distribution sub-housing is filled with oil, the fourth switch valve is in a normally closed state and the third switch valve is opened, and the fourth switch valve is closed to prevent the leaked oil in the distribution sub-housing from flowing out.

[0013] Furthermore, the hydraulic system detects the oil flow passing through the third switch valve through the second flow sensor, and the oil flow is the leakage flow.

[0014] Furthermore, the electronic control system has a safety monitoring module, which provides timely warning or triggers the emergency stop switch based on the sensor feedback parameters of the drive system and the hydraulic system when one of the following situations occurs: the hydraulic system pressure is suddenly too high, the hydraulic system or the test device is overheated, the motor speed or torque is suddenly abnormal, and the filter is clogged.

[0015] Furthermore, the oil in the low-pressure chamber of the distribution pair and the return oil in the distribution pair housing both flow back to the second oil tank of the hydraulic system. The second oil tank has a cooler and a filter, which can flow the filtered and cooled oil into the first oil tank through the second pressure valve, thereby realizing heat dissipation of the two oil tanks and avoiding excessive temperature of the hydraulic system affecting the stability of the test system.

[0016] Furthermore, the principle and specific method of pressure control of the simulated test are as follows: the simulated pressure control adopts the fuzzy PID control algorithm, firstly, the pressure signal to be simulated p a (k) is input into the fuzzy PID control algorithm, which uses the control error e The pressure increment is obtained, and the signal conversion is completed through the interpolation module after identification, which is converted into the voltage signal of the pressure control valve, thereby obtaining the simulated pressure of the test system. p (k) The simulated pressure is fed back through the pressure-temperature sensor and the signal conversion module, and the simulated pressure and the analog pressure signal are continuously adjusted until they are the same, ensuring the accurate and stable input of the simulated pressure.

[0017] On the other hand, the present invention also provides a method for simulating the leakage characteristics of the flow distribution pair of a wide speed ratio internal curve motor, the method comprising the following steps:

[0018] (1) First, turn on the online computer, initialize the setting parameters of the electronic control system, and turn on the data acquisition and processing module, data storage module, and safety monitoring module;

[0019] (2) After checking that the system wiring is normal, set the servo motor speed in the electronic control system. The servo motor of the drive system drives the cylinder of the test device to rotate. The data processing module of the electronic control system collects the speed sensor and torque sensor parameters of the drive system in real time.

[0020] (3) Then, the outlet pressure of the second hydraulic pump of the hydraulic system is set in the electronic control system. After receiving the command, the second pressure control valve of the hydraulic system adjusts the output pressure of the second hydraulic pump of the hydraulic system. The fourth switch valve is opened to allow the oil to flow into the distribution sub-housing. When the distribution sub-housing is filled with oil, the fourth switch valve is closed.

[0021] (4) The outlet pressure of the first hydraulic pump of the hydraulic system is set in the electronic control system, and the fuzzy PID control algorithm is used to simulate the real dynamic pressure input of the distribution pair. After receiving the command, the first pressure control valve of the hydraulic system adjusts the output pressure of the first hydraulic pump in the hydraulic system, and the three-position four-way reversing valve, the two-position four-way reversing valve, and the third switch valve are opened in sequence to allow the high-pressure oil to flow into the distribution plate, and the high-low pressure distribution of the distribution plate works;

[0022] (5) The data processing module of the electronic control system collects the parameters of the pressure and temperature sensor, flow sensor, eddy current displacement sensor of the hydraulic system and the parameters of the speed sensor and torque sensor of the drive system in real time to complete data processing and visualization;

[0023] (6) After all tests are completed, export or upload the stored data to the network cloud, and then shut down the hydraulic system, drive system, and power supply in turn.

[0024] The beneficial results of the present invention are:

[0025] 1. A simulation test system for leakage characteristics of a wide speed ratio internal curve motor distribution pair proposed in the present invention adopts a fuzzy PID control algorithm to control the pressure signal input of the distribution pair, which can accurately simulate the working conditions of real applications, especially under conditions of an extremely wide speed range, it can still restore the leakage characteristics of the distribution pair of the internal curve hydraulic motor under real working conditions, and realize the wider speed regulation range requirements of the internal curve motor. Further, by analyzing the leakage characteristics of the distribution pair, the distribution pair structure is optimized to realize the wide speed ratio operation capability of the internal curve motor.

[0026] 2. The simulated test system for the leakage characteristics of the flow distribution pair of a wide speed ratio internal curve motor proposed in the present invention can realize online remote control and safety monitoring. According to the sensor feedback parameters of the test system, it can automatically start the protection function when a fault or abnormal signal occurs, and timely issue an alarm signal on the visual interface and further trigger the emergency stop switch. It is particularly suitable for analyzing the time evolution characteristics of the leakage characteristics of the flow distribution pair interface during long-term endurance testing. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0028] Figure 1 This is a schematic diagram of a simulation test system for leakage characteristics of a wide speed ratio internal curve motor flow pair.

[0029] Figure 2 This is a hydraulic system schematic diagram of a simulation test system for leakage characteristics of a wide speed ratio internal curve motor distribution pair.

[0030] Figure 3 This is a schematic diagram of the simulated pressure control of a simulation test system for the leakage characteristics of a wide speed ratio internal curve motor distribution pair.

[0031] Figure 4 The test flow chart of a simulation test system for leakage characteristics of a wide speed ratio internal curve motor distribution pair.

[0032] Figure 5 The figure is a test diagram of a certain working condition example of a simulation test system for leakage characteristics of a wide speed ratio internal curve motor distribution pair.

[0033] In the accompanying drawings, the reference numerals are: 1. first motor; 2. first hydraulic pump; 3. one-way valve; 4. high-pressure filter; 5. three-position four-way reversing valve; 6. first switch valve; 7. first pressure control valve; 8. pressure gauge; 9. first pressure-temperature sensor; 10. stop valve; 11. accumulator; 12. two-position four-way reversing valve; 13. first flow sensor; 14. second pressure-temperature sensor; 15. third pressure-temperature sensor; 16. second switch valve; 17. fourth pressure-temperature sensor; 18. second flow sensor; 19. second pressure control valve; 20. third flow sensor; 21. first filter; 22. third switch valve; 23. fifth pressure-temperature sensor; 24. fourth switch valve; 25. circulating cooler; 26. second filter; 27. second hydraulic pump; 28. second motor; 29. ​​level gauge; 30. air filter; 31. temperature sensor; 32. first fuel tank; 33. second fuel tank. DETAILED DESCRIPTION

[0034] The preferred embodiments of the present invention are described in detail below in conjunction with the accompanying drawings so that the advantages and features of the present invention can be more easily understood by those skilled in the art, thereby making a clearer and more definite definition of the protection scope of the present invention.

[0035] The present invention is further described below with reference to the accompanying drawings. The present invention provides a simulation test system for leakage characteristics of a wide speed ratio internal curve motor flow pair, such as Figure 1 As shown, the system includes three parts: electronic control system, drive system and hydraulic system, which are used to drive the flow distribution pair test device;

[0036] The electronic control system includes an online networked computer, a data acquisition and processing module, a data storage module, a signal interaction control module and a safety monitoring module; it is used to realize online remote control of the virtual test system, perform data acquisition and processing and data storage on the signals collected by each sensor of the test system, and perform health management, status monitoring and fault warning on the entire virtual test system in real time;

[0037] The drive system includes a servo controller, a servo motor, a speed sensor, and a torque sensor; it is used to control the rotation speed of the rotating component of the test device, drive the rotating component through the simulated working condition speed input in real time by the electronic control system, and feed back the speed and torque signals to the electronic control system in real time through the speed sensor and the torque sensor;

[0038] like Figure 2 As shown, the hydraulic system includes a first motor 1, a first hydraulic pump 2, a one-way valve 3, a high-pressure filter 4, a three-position four-way reversing valve 5, a first switch valve 6, a first pressure control valve 7, a pressure gauge 8, a first pressure and temperature sensor 9, a stop valve 10, an accumulator 11, a two-position four-way reversing valve 12, a first flow sensor 13, a second pressure and temperature sensor 14, a third pressure and temperature sensor 15, a second switch valve 16, a fourth pressure and temperature sensor 17, a second flow sensor 18, a second pressure control valve 19, a third flow sensor 20, a first filter 21, a third switch valve 22, The fifth pressure-temperature sensor 23, the fourth switch valve 24, the circulating cooler 25, the second filter 26, the second hydraulic pump 27, the second motor 28, the liquid level gauge 29, the air filter 30, the temperature sensor 31, the first oil tank 32 and the second oil tank 33 are used to supply and recover the oil of the distribution pair of the test device, adjust the pressure control valve through the pressure signal input of the electronic control system to simulate the flow of the pressure oil of the real working condition in real time, and feed back the pressure, temperature, leakage and displacement data of the distribution pair to the electronic control system in real time through the pressure-temperature sensor, the flow sensor and the eddy current displacement sensor;

[0039] The first hydraulic pump 2 of the hydraulic system is driven by the first motor 1, and the oil in the first oil tank 32 is transferred to the high-pressure chamber of the distribution pair through the one-way valve 3, the high-pressure filter 4, the three-position four-way reversing valve 5 and the two-position four-way reversing valve 12; the purpose of the one-way valve 3 is to prevent the hydraulic system from flowing back and to prevent the oil from flowing back to the hydraulic pump; the purpose of the high-pressure filter 4 is, on the one hand, because the first pressure control valve 7 is an extremely precise electro-hydraulic proportional servo valve, which has extremely high requirements on the cleanliness of the oil, and it is necessary to filter the oil of the hydraulic system with high precision; on the other hand, it is to doubly ensure the cleanliness of the oil. The high-pressure filter 7 is set at the outlet of the first hydraulic pump 2 to avoid the influence of the oil contamination of the hydraulic pump on the cleanliness of the hydraulic system; the purpose of the three-position four-way reversing valve 5 is to add an additional high-pressure oil circuit as an alternative to prevent the high-pressure oil of the distribution pair The channel is abnormal; the purpose of the first switch valve 6 is to connect the high-pressure oil channel of the distribution pair to ensure the normal operation of the system when the system is abnormal, and it is generally in a normally closed state; the purpose of the two-position four-way reversing valve 12 is that when the electromagnet switches to the left passage, the oil in this passage will flow into the high-pressure chamber of the distribution pair to provide high-pressure oil for the distribution pair, and when the electromagnet switches to the right passage, the oil will flow into the loading chamber of the distribution pair to simulate the clamping force of the distribution pair to further calibrate the friction torque of the distribution pair; the purpose of the second switch valve 16 is to unload the oil in the loading chamber of the distribution pair, and it is generally in a normally closed state; the purpose of the accumulator 11 is to absorb part of the pressure pulsation of the hydraulic pump itself, which can reduce the influence of high-frequency pressure fluctuations in the hydraulic system on the simulated pressure control algorithm; the oil in the low-pressure chamber of the distribution pair flows directly back to the second oil tank 33;

[0040] The second hydraulic pump 27 of the hydraulic system is driven by the second motor 28, and the oil in the second oil tank 33 flows into the distribution pair housing through the second filter 26, the cooler 25 and the fourth switch valve 24; the purpose of the second pressure control valve 19 is to adjust the housing pressure of the distribution pair by receiving the pressure signal instruction of the electronic control system, and to flow the excess oil of the second hydraulic pump 27 back to the first oil tank 32; the purpose of the fourth switch valve 24 is to input the oil into the distribution pair housing in one direction, at which time the third switch valve 22 is closed and the fourth switch valve 24 is opened. When the distribution pair housing is full of oil, the fourth switch valve 24 is in a normally closed state and the third switch valve 22 is opened to prevent the backflow of the oil in the distribution pair housing; the oil in the distribution pair housing flows back to the second oil tank 33 through the first filter 21 and the third switch valve 22. The purpose of the first filter 21 is to filter the impurities in the distribution pair housing to prevent the impurities such as the abrasive wear debris of the distribution plate and the cylinder body from flowing back to the hydraulic oil tank;

[0041] The second pressure-temperature sensor 14, the third pressure-temperature sensor 15 and the fifth pressure-temperature sensor 23 respectively measure the pressure and temperature of the distribution pair high-pressure chamber, the distribution pair loading chamber and the distribution pair shell, and feed back the measured pressure signals to the electronic control system. In order to simulate the real working condition of the distribution pair, the electronic control system controls the first pressure control valve 7 and the second pressure control valve 19 in real time through the fuzzy control PID algorithm and the signal conversion module, thereby realizing the simulated and stable control of the pressure of the distribution pair.

[0042] Furthermore, the safety monitoring module of the electric control system provides timely warning or triggers the emergency stop switch according to the sensor feedback parameters of the test system and when one of the following situations occurs: the hydraulic system pressure is suddenly too high, the hydraulic system or the test device is overheated, the motor speed or torque is suddenly abnormal, the filter is clogged, etc.;

[0043] Furthermore, the oil in the distribution pair low-pressure chamber and the return oil in the distribution pair housing both flow back to the second oil tank 33. Since the second oil tank 33 has a cooler 25 and a filter 26, the filtered and cooled oil can flow into the first oil tank 32 through the second pressure valve 19, thereby achieving heat dissipation of the two oil tanks and preventing the temperature of the hydraulic system from being too high and affecting the stability of the test system.

[0044] Furthermore, after the housing of the distribution pair is filled with oil, when there is oil leakage in the distribution pair, the excess oil in the housing of the distribution pair will flow back to the second oil tank 33 through the third flow sensor 20, and the oil measured by the third flow sensor 20 is the leaked oil of the distribution pair;

[0045] Furthermore, if Figure 3 As shown in the figure, the principle and specific method of the simulated pressure control are as follows: the simulated pressure control adopts the fuzzy PID control algorithm to avoid the influence of pressure fluctuation on the pressure signal regulation of the test system, and can adapt to frequent and large-scale changes in pressure. First, the pressure signal to be simulated p a (k) is input into the fuzzy PID control algorithm, which uses the control error e The pressure increment is obtained, and the signal conversion is completed through the interpolation module after identification, which is converted into the voltage signal of the pressure control valve, thereby obtaining the simulated pressure of the test system. p (k) The simulated pressure is fed back through the pressure-temperature sensor and the signal conversion module, and the simulated pressure and the analog pressure signal are continuously adjusted until they are the same, ensuring the accurate and stable input of the simulated pressure.

[0046] In a specific embodiment, corresponding to the embodiment of the above-mentioned simulation test system for leakage characteristics of the wide speed ratio internal curve motor distribution pair, as shown in FIG. Figure 4As shown, the present invention also provides a test method for a simulation test system of leakage characteristics of a wide speed ratio internal curve motor distribution pair, and the specific steps are as follows:

[0047] (1) First, turn on the online computer, initialize the setting parameters of the electronic control system, and turn on the data acquisition and processing module, data storage module, and safety monitoring module;

[0048] (2) After checking that the system wiring is normal, set the servo motor speed in the electronic control system. The servo motor of the drive system drives the cylinder of the test device to rotate, so that the rotation speed of the cylinder is 10 r / min. The data processing module of the electronic control system collects the speed sensor and torque sensor parameters of the drive system in real time;

[0049] (3) Then, the outlet pressure of the second hydraulic pump 27 of the hydraulic system is set in the electronic control system. After receiving the command, the second pressure control valve 19 of the hydraulic system adjusts the output pressure of the second hydraulic pump 27 of the hydraulic system. The fourth switch valve 24 is opened to allow the oil to flow into the distribution sub-housing. When the distribution sub-housing is filled with oil, the fourth switch valve 24 is closed.

[0050] (4) The outlet pressure of the first hydraulic pump 2 of the hydraulic system is set in the electronic control system, and the fuzzy PID control algorithm is used to simulate the real dynamic pressure input of the distribution pair. After receiving the command, the first pressure control valve 7 of the hydraulic system adjusts the output pressure of the first hydraulic pump 2 in the hydraulic system, and the three-position four-way reversing valve 5, the two-position four-way reversing valve 12, and the third switch valve 22 are opened in sequence to allow the high-pressure oil to flow into the distribution plate, and the high-low pressure distribution of the distribution plate works;

[0051] (5) The data processing module of the electronic control system collects the parameters of the pressure and temperature sensor, flow sensor, eddy current displacement sensor of the hydraulic system and the parameters of the speed sensor and torque sensor of the drive system in real time to complete data processing and visualization;

[0052] (6) After all tests are completed, test again and reset the servo motor speed in (2) so that the cylinder body rotates at 100 r / min. The rest of the test process and data collection process are exactly the same;

[0053] (7) Export or upload the stored data to the network cloud, then shut down the hydraulic system, drive system, and power supply in turn.

[0054] (8) Under the same simulated pressure input and different speed input conditions, the leakage of the distribution pair at 10r / min and 100r / min is measured as follows: Figure 5 As shown, it can be seen that the leakage of the distribution pair at low speed is larger than that at high speed, which is consistent with the results obtained by theoretical calculation.

[0055] The above descriptions are merely embodiments of the present invention and are not intended to limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made using the contents of the present invention specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A simulation test system for leakage characteristics of a wide speed ratio internal curve motor flow pair, characterized in that: The system includes three parts: drive system, hydraulic system and electronic control system; The drive system includes a servo controller, a servo motor, a speed sensor and a torque sensor; the servo motor is connected to the electronic control system through the servo controller; the servo motor is used to control the rotation speed of the cylinder in the distribution pair, and the speed sensor and the torque sensor are used to detect the rotation speed and torque of the cylinder and feed back to the electronic control system; The hydraulic system includes a first hydraulic pump, a second hydraulic pump, a first pressure control valve, a second pressure control valve and a pressure-temperature sensor driven by a motor; the first hydraulic pump is used to supply oil to the high-pressure chamber and the loading chamber of the distribution pair, and a first pressure control valve is arranged on the oil circuit to adjust the pressure in the high-pressure chamber and the loading chamber to simulate the actual stress state of the inner curve motor under different working conditions of the distribution pair; the second hydraulic pump is used to supply oil to the housing of the distribution pair so that the housing is filled with oil, and a second pressure control valve is arranged on the oil circuit to adjust the pressure in the housing of the distribution pair to simulate the working environment of the distribution pair under different working conditions; a flow sensor is arranged on the oil return line of the housing to measure the leakage flow of the distribution pair; the pressure-temperature sensor is used to detect the pressure and temperature in the high-pressure chamber, the loading chamber and the housing of the distribution pair, and feed back to the electronic control system; The hydraulic system uses a second hydraulic pump to transfer the oil from the second oil tank through a second filter, a cooler and a fourth switch valve into the distribution sub-housing; a third switch valve is arranged on the oil return line of the distribution sub-housing; the fourth switch valve is used to input the oil into the distribution sub-housing in one direction, at which time the third switch valve is closed and the fourth switch valve is opened, and when the distribution sub-housing is filled with oil, the fourth switch valve is in a normally closed state and the third switch valve is opened, and the fourth switch valve is closed to prevent the leakage of oil in the distribution sub-housing from flowing out; the hydraulic system detects the oil flow through the third switch valve through a second flow sensor, and the oil flow is the leakage flow; The electronic control system is used to control the rotation speed of the servo motor through the servo controller according to the rotation speed and torque of the cylinder body; to adjust the first pressure control valve according to the pressure and temperature feedback in the high-pressure chamber and the loading chamber, and to adjust the second pressure control valve according to the pressure and temperature in the housing of the distribution pair.

2. A simulation test system for leakage characteristics of a wide speed ratio internal curve motor valve pair according to claim 1, characterized in that: The hydraulic system transfers the oil in the first oil tank to the distribution secondary high-pressure chamber and the loading chamber through the first hydraulic pump via the one-way valve, the high-pressure filter and the two-position four-way reversing valve.

3. A simulation test system for leakage characteristics of a wide speed ratio internal curve motor valve pair according to claim 2, characterized in that: When the two-position four-way reversing valve is switched to the left passage, the oil in the left passage will flow into the high-pressure chamber of the distribution pair. The high-pressure chamber is used to simulate the oil supply pressure of the distribution pair under different working conditions. When the two-position four-way reversing valve is switched to the right passage, the oil in the right passage will flow into the loading chamber of the distribution pair. The loading chamber is used to control the loading force generated by the pressure of the oil in the chamber to equalize the clamping force of the distribution pair, simulate the actual stress state of the distribution pair in the inner curve motor, and realize the calibration of the friction torque of the transmission system in the distribution pair device.

4. A simulation test system for leakage characteristics of wide speed ratio internal curve motor valve pair according to claim 1, characterized in that: The electronic control system has a safety monitoring module, which provides timely warning or triggers the emergency stop switch according to the sensor feedback parameters of the drive system and the hydraulic system when one of the following situations occurs: sudden excessive pressure in the hydraulic system, overheating of the hydraulic system or the test device, sudden abnormal motor speed or torque, and blockage of the filter.

5. The system for simulating leakage characteristics of a wide speed ratio internal curve motor valve pair according to claim 1, characterized in that: The oil in the low-pressure chamber of the distribution pair and the return oil in the distribution pair housing both flow back to the second oil tank of the hydraulic system. The second oil tank has a cooler and a filter, which can flow the filtered and cooled oil into the first oil tank through the second pressure valve, thereby realizing heat dissipation of the two oil tanks and avoiding excessive temperature of the hydraulic system affecting the stability of the test system.

6. The system for simulating leakage characteristics of a wide speed ratio internal curve motor valve pair according to claim 1, characterized in that: The principle and specific method of pressure control in the simulation test are as follows: The simulation pressure control adopts the fuzzy PID control algorithm. First, the pressure signal to be simulated p a (k) is input into the fuzzy PID control algorithm, which uses the control error e The pressure increment is obtained, and the signal conversion is completed through the interpolation module after identification, which is converted into the voltage signal of the pressure control valve, thereby obtaining the simulated pressure of the test system. p (k) The simulated pressure is fed back through the pressure-temperature sensor and the signal conversion module, and the simulated pressure and the analog pressure signal are continuously adjusted until they are the same, ensuring the accurate and stable input of the simulated pressure.

7. A method for testing a simulation test system for leakage characteristics of a wide speed ratio internal curve motor valve pair according to any one of claims 1 to 6, characterized in that: The method comprises the following steps: (1) First, turn on the online computer, initialize the setting parameters of the electronic control system, and turn on the data acquisition and processing module, data storage module, and safety monitoring module; (2) After checking that the system wiring is normal, set the servo motor speed in the electronic control system. The servo motor of the drive system drives the cylinder of the test device to rotate. The data processing module of the electronic control system collects the speed sensor and torque sensor parameters of the drive system in real time. (3) Then, the outlet pressure of the second hydraulic pump of the hydraulic system is set in the electronic control system. After receiving the command, the second pressure control valve of the hydraulic system adjusts the output pressure of the second hydraulic pump of the hydraulic system. The fourth switch valve is opened to allow the oil to flow into the distribution sub-housing. When the distribution sub-housing is filled with oil, the fourth switch valve is closed. (4) The outlet pressure of the first hydraulic pump of the hydraulic system is set in the electronic control system, and the fuzzy PID control algorithm is used to simulate the real dynamic pressure input of the distribution pair. After receiving the command, the first pressure control valve of the hydraulic system adjusts the output pressure of the first hydraulic pump in the hydraulic system, and the three-position four-way reversing valve, the two-position four-way reversing valve, and the third switch valve are opened in sequence to allow the high-pressure oil to flow into the distribution plate, and the high-low pressure distribution of the distribution plate works; (5) The data processing module of the electronic control system collects the parameters of the pressure and temperature sensor, flow sensor, eddy current displacement sensor of the hydraulic system and the parameters of the speed sensor and torque sensor of the drive system in real time to complete data processing and visualization; (6) After all tests are completed, export or upload the stored data to the network cloud, and then shut down the hydraulic system, drive system, and power supply in turn.

Images