Rotary testing machine hydraulic system for detecting rotary compensator

Abstract

The invention relates to the technical field of rotation testing machines, and provides a rotation testing machine hydraulic system for rotation compensator detection, which comprises an oil pump motor unit, a control assembly and an execution assembly, the oil pump motor unit comprises an axial plunger pump and a motor; the axial plunger pump is connected with the motor through a coupler; the execution assembly comprises two groups of horizontal oil cylinder assemblies and vertical oil cylinders; the control assembly comprises a control system and three proportional reversing valves; one proportional reversing valve is connected with the vertical oil cylinder; the other two proportional directional valves are respectively connected with two groups of horizontal oil cylinder assemblies, and each group of horizontal oil cylinder assembly consists of two diagonal horizontal oil cylinders; a first displacement sensor is arranged in one horizontal oil cylinder in the two sets of horizontal oil cylinder assemblies, a second displacement sensor is arranged in the vertical oil cylinder, and the control system is electrically connected with the proportional reversing valve, the first displacement sensor and the second displacement sensor so that the problems that the two sets of horizontal oil cylinders cannot act in a coordinated mode, and the rotation angle cannot be accurately controlled can be solved.

Description

Technical Field

[0001] The present application relates to the technical field of rotary testing machines, and particularly relates to a hydraulic system of a rotary testing machine for detecting rotary compensators. Background Art

[0002] As a device for testing the performance and characteristics of materials, parts or products in a rotating state, a rotary testing machine plays a crucial role in industrial production and quality control. Especially in the field of comprehensive performance detection of rotary compensators, the application of a rotary testing machine is particularly critical. As an important component in a pipeline system for absorbing displacements and rotations caused by thermal expansion and contraction, the quality and performance of a rotary compensator are directly related to the safe and stable operation of the pipeline system. Therefore, a rotary testing machine that can accurately test and evaluate the performance of a rotary compensator under various working conditions is particularly important.

[0003] With the continuous development of industrial technology, the requirements for rotary compensators in pipeline systems under complex working conditions such as steam pipelines and high-temperature and high-pressure transportation pipelines are also increasing day by day. These high-standard application requirements pose more stringent challenges to the performance of rotary testing machines. In the related art, the driving mode of rotary testing machines mostly adopts the mode of a motor plus a speed reducer. However, this mode has significant limitations. On the one hand, it is difficult to achieve automatic reciprocating rotary motion with the motor-plus-speed-reducer mode. In practical applications, a rotary compensator needs to perform reciprocating rotary motion under simulated actual working conditions to comprehensively evaluate its performance. Due to structural limitations, the motor-plus-speed-reducer mode can often only achieve one-way rotation and cannot meet this testing requirement. This limits the comprehensive evaluation ability of a rotary testing machine for the performance of a rotary compensator under simulated complex working conditions. On the other hand, there are also deficiencies in accurately controlling the rotation angle with the motor-plus-speed-reducer mode. Precise control of the rotation angle is crucial for the performance testing of a rotary compensator because rotation at different angles may have different effects on the rotary compensator. However, due to factors such as the motor speed and the transmission ratio of the speed reducer, it is often difficult to achieve high-precision control of the rotation angle with the motor-plus-speed-reducer mode. This reduces the accuracy and reliability of the test results and cannot provide strong support for the optimized design and quality improvement of rotary compensators. Summary of the Invention

[0004] The present application provides a hydraulic system of a rotary testing machine for detecting rotary compensators to solve the problem that two groups of horizontal oil cylinders cannot act in coordination and the rotation angle cannot be accurately controlled.

[0005] The present application provides a hydraulic system of a rotary testing machine for detecting rotary compensators, including: an oil pump motor unit, a control component, and an execution component; The oil pump motor unit includes an axial piston pump and an electric motor; the axial piston pump and the electric motor are connected by a coupling; The execution component includes two groups of horizontal oil cylinder assemblies and a vertical oil cylinder; the two groups of horizontal oil cylinder assemblies are arranged in parallel at both ends of the movable fixing frame of the rotary testing machine, and one end of the piston rod of the vertical oil cylinder is fixedly connected to the movable fixing frame; The control component includes a control system and three proportional directional control valves; one proportional directional control valve is connected to the vertical oil cylinder; the other two proportional directional control valves are respectively connected to the two groups of horizontal oil cylinder assemblies, and each group of horizontal oil cylinder assemblies consists of two horizontal oil cylinders at diagonals; One of the horizontal oil cylinders in the two groups of horizontal oil cylinder assemblies is internally provided with a first displacement sensor, the vertical oil cylinder is internally provided with a second displacement sensor, and the control system is electrically connected to the proportional directional control valve, the first displacement sensor, and the second displacement sensor respectively.

[0006] The hydraulic system of the rotary testing machine described in this application can not only use a vertical oil cylinder with an internal displacement sensor to drive the movable fixing frame to move up and down and be fixed, so as to realize the installation of multi-size rotary compensators; but also use a proportional directional control valve with electrical feedback and a horizontal oil cylinder with a high-precision internal displacement sensor. Through two-layer closed-loop feedback, the synchronous movement of the two groups of horizontal oil cylinder assemblies and the precise control of the rotation angle are realized, so as to solve the problem that the two groups of horizontal oil cylinders cannot coordinate their actions and the rotation angle cannot be accurately controlled.

[0007] Optionally, the control component further includes two shuttle valves; each shuttle valve is arranged between the horizontal oil cylinder assembly and the proportional directional control valve; the shuttle valve is connected to the axial piston pump through a hydraulic pipeline to feed back the detected load pressure signal to the control unit of the axial piston pump in real time.

[0008] The shuttle valve can detect the load pressure signal in real time and feed it back to the control unit of the axial piston pump, so that the control unit of the axial piston pump dynamically adjusts the working pressure and displacement of the axial piston pump according to the load pressure signal, ensuring that the pressure difference between the inlet end and the outlet end of the proportional directional control valve is maintained at a preset constant value, thereby optimizing the efficiency and stability of the hydraulic system.

[0009] Optionally, the control component further includes a balance valve; the balance valve is arranged between the vertical oil cylinder and the proportional directional control valve to adjust and control the hydraulic flow of the vertical oil cylinder.

[0010] The balance valve can not only prevent the vertical oil cylinder from sliding down at high speed during the extension process, but also lock at any position to play a safety protection role.

[0011] Optionally, the control component further includes a normally open electromagnetic overflow valve; the normally open electromagnetic overflow valve is arranged between the oil pump motor unit and the proportional directional control valve and is in a normally open state.

[0012] The normally open electromagnetic overflow valve can not only enable the oil pump motor unit to start under no-load conditions, but also unload the system when the execution component is on standby during operation, so as to reduce the heating of the oil fluid and save energy.

[0013] Optionally, the proportional directional valve includes a proportional solenoid, a spool valve, a valve body, valve ports, and a displacement sensor; the spool valve is arranged inside the valve body; the control system is electrically connected to the proportional solenoid to control the proportional solenoid to drive the spool valve to move inside the valve body, thereby changing the opening and closing states of the valve ports; the control system is electrically connected to the displacement sensor to control the displacement sensor to detect the position of the spool valve.

[0014] Through the close cooperation of the proportional solenoid, the spool valve, the valve body, the valve ports, and the displacement sensor, the proportional directional valve realizes the precise control of the fluid flow direction and speed. At the same time, the electrical connection between the control system and these components enables the system to monitor and adjust the state of the spool valve in real time, thereby achieving high-precision and high-stability fluid control.

[0015] Optionally, the hydraulic system of the rotary testing machine further includes auxiliary components; the auxiliary components include an oil suction filter, an oil return filter, and an oil tank; the liquid inlet end of the oil suction filter is communicated with the oil tank, and the liquid outlet end of the oil suction filter is connected to the axial piston pump; the liquid inlet end of the oil return filter is connected to the proportional directional valve, and the liquid outlet end of the oil return filter is communicated to the oil tank.

[0016] The oil suction filter and the oil return filter can remove impurities and particulate matters in the oil fluid, protect key components, improve the quality of the oil fluid, and thus ensure that the system can operate stably and efficiently for a long time.

[0017] Optionally, the auxiliary components further include a cooler, a liquid level relay, a liquid level gauge, and an air filter; the cooler, the liquid level relay, the liquid level gauge, and the air filter are all arranged on the oil tank.

[0018] The cooler, the liquid level relay, the liquid level gauge, and the air filter cooperate with each other through their respective functions, improving the stability, safety, automation level, and oil fluid quality of the system, and providing a strong guarantee for the long-term stable operation of the system.

[0019] Optionally, the control component further includes a check valve; the inlet of the check valve is communicated with the oil pump motor unit, and the outlet of the check valve is communicated with the proportional directional valve.

[0020] The inlet of the one-way valve is connected to the oil pump motor unit, capable of timely receiving high-pressure hydraulic oil from the oil pump motor unit and stably transmitting it to subsequent hydraulic components. The outlet of the one-way valve is connected to the proportional direction valve, so that the flow rate and direction of the hydraulic oil can be precisely adjusted through the proportional direction valve according to the control requirements of the system, thereby achieving precise control of the speed and movement direction of the actuator assembly. This connection method can make the hydraulic system operate more efficiently and improve the response speed and control accuracy of the system.

[0021] Optionally, the auxiliary component further includes a pressure sensor; the pressure sensor is connected between the proportional direction valve and the one-way valve; the control system is electrically connected to the pressure sensor to measure the pressure in the actuator assembly through the pressure sensor, and then calculate the torque of the horizontal oil cylinder.

[0022] The pressure sensor is connected between the proportional direction valve and the one-way valve, capable of capturing system pressure changes in the first time and feeding back to the control system, measuring the pressure of the actuator assembly in real time and accurately, and providing accurate data for torque conversion. The control system is electrically connected to the pressure sensor, and can quickly convert the pressure signal into the torque of the horizontal oil cylinder to achieve precise control.

[0023] As can be seen from the above technical solutions, the present application provides a hydraulic system for a rotary testing machine for rotary compensator detection, including: an oil pump motor unit, a control component, and an actuator component; the oil pump motor unit includes an axial piston pump and a motor; the axial piston pump and the motor are connected by a coupling; the actuator component includes two groups of horizontal oil cylinder components and a vertical oil cylinder; the two groups of horizontal oil cylinder components are arranged in parallel at both ends of the movable fixing frame of the rotary testing machine, and one end of the piston rod of the vertical oil cylinder is fixedly connected to the movable fixing frame; the control component includes a control system and three proportional direction valves; one proportional direction valve is connected to the vertical oil cylinder; the other two proportional direction valves are respectively connected to the two groups of horizontal oil cylinder components, and each group of horizontal oil cylinder components consists of two horizontal oil cylinders at diagonals; one of the horizontal oil cylinders in the two groups of horizontal oil cylinder components is internally provided with a first displacement sensor, and the vertical oil cylinder is internally provided with a second displacement sensor, and the control system is electrically connected to the proportional direction valve, the first displacement sensor, and the second displacement sensor respectively. To solve the problem that the two groups of horizontal oil cylinders cannot coordinate their actions and cannot accurately control the rotation angle. Description of the Drawings

[0024] In order to more clearly illustrate the technical solutions of the present application, the drawings required for use in the embodiments will be briefly introduced below. Obviously, for those of ordinary skill in the art, other drawings can also be obtained based on these drawings without creative efforts.

[0025] Figure 1 Schematic diagram of the hydraulic system of the rotary testing machine for rotary compensator detection according to the embodiment of the present application; Figure 2 Front structural schematic diagram of the hydraulic system of the rotary testing machine for rotary compensator detection according to the embodiment of the present application; Figure 3 Top structural schematic diagram of the hydraulic system of the rotary testing machine for rotary compensator detection according to the embodiment of the present application; Figure 4 Partial enlarged view at A of the front structural schematic diagram of the hydraulic system of the rotary testing machine for rotary compensator detection according to the embodiment of the present application; Figure 5 Partial enlarged view at B of the top structural schematic diagram of the hydraulic system of the rotary testing machine for rotary compensator detection according to the embodiment of the present application.

[0026] Illustration description: Among them, 1 - First horizontal oil cylinder; 2 - Second horizontal oil cylinder; 3 - Vertical oil cylinder; 4 - Third horizontal oil cylinder; 5 - Fourth horizontal oil cylinder; 6 - Second displacement sensor; 7 - Movable fixed frame; 8 - Balance valve; 9 - Proportional direction valve; 10 - Normally open electromagnetic overflow valve; 11 - Suction oil filter; 12 - Shuttle valve; 13 - Return oil filter; 14 - Oil tank; 15 - Axial piston pump; 16 - Motor; 17 - Control system; 18 - Cooler; 19 - Pressure sensor; 20 - Liquid level relay; 21 - Liquid level gauge; 22 - Air filter; 23 - First displacement sensor. Specific implementation manners

[0027] The embodiments will be described in detail below, and the examples are shown in the drawings. When the following description refers to the drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements. The implementation manners described in the following embodiments do not represent all implementation manners consistent with the present application. They are only examples of systems and methods consistent with some aspects of the present application.

[0028] As a device for testing the performance and characteristics of materials, parts or products in a rotating state, the rotary testing machine plays a crucial role in industrial production and quality control. Especially in the field of comprehensive performance detection of rotary compensators, the application of the rotary testing machine is particularly critical. As an important component in the pipeline system for absorbing displacements and rotations caused by thermal expansion and contraction, the quality and performance of the rotary compensator are directly related to the safe and stable operation of the pipeline system. Therefore, a rotary testing machine that can accurately test and evaluate the performance of the rotary compensator under various working conditions is particularly important.

[0029] In related embodiments, the driving mode of the rotary testing machine mostly adopts the mode of motor plus speed reducer. However, this mode has significant limitations. On the one hand, it is difficult to achieve automatic reciprocating rotary motion with the motor plus speed reducer mode. In practical applications, the rotary compensator needs to perform reciprocating rotary motion under simulated actual working conditions to comprehensively evaluate its performance. Due to structural limitations, the motor plus speed reducer mode can often only achieve one-way rotation and cannot meet this testing requirement. This limits the comprehensive evaluation ability of the rotary testing machine for the performance of the rotary compensator under simulated complex working conditions. On the other hand, the motor plus speed reducer mode also has deficiencies in accurately controlling the rotation angle. Precise control of the rotation angle is crucial for the performance test of the rotary compensator because rotation at different angles may have different effects on the rotary compensator. However, due to factors such as the motor speed and the transmission ratio of the speed reducer, the motor plus speed reducer mode often has difficulty in achieving high-precision control of the rotation angle. This reduces the accuracy and reliability of the test results and cannot provide strong support for the optimized design and quality improvement of the rotary compensator.

[0030] To solve the above technical problems, refer to Figures 1 - 5 , an embodiment of the present application provides a hydraulic system for a rotary testing machine for detecting a rotary compensator, including: an oil pump motor unit, a control component, and an execution component; the oil pump motor unit includes an axial piston pump 15 and a motor 16; the axial piston pump 15 and the motor 16 are connected by a coupling; the execution component includes two groups of horizontal oil cylinder components and a vertical oil cylinder 3; the two groups of horizontal oil cylinder components are arranged in parallel at both ends of the movable fixed frame 7 of the rotary testing machine, and one end of the piston rod of the vertical oil cylinder 3 is fixedly connected to the movable fixed frame 7; the control component includes a control system 17 and three proportional directional control valves 9; one proportional directional control valve 9 is connected to the vertical oil cylinder 3; the other two proportional directional control valves 9 are respectively connected to the two groups of horizontal oil cylinder components, and each group of horizontal oil cylinder components consists of two horizontal oil cylinders at diagonals; one of the horizontal oil cylinders in the two groups of horizontal oil cylinder components is internally provided with a first displacement sensor 23, the vertical oil cylinder 3 is internally provided with a second displacement sensor 6, and the control system 17 is electrically connected to the proportional directional control valve 9, the first displacement sensor 23, and the second displacement sensor 6 respectively.

[0031] It should be understood that the four horizontal oil cylinders include a first horizontal oil cylinder 1, a second horizontal oil cylinder 2, a third horizontal oil cylinder 4, and a fourth horizontal oil cylinder 5. The first horizontal oil cylinder 1 and the third horizontal oil cylinder 4 can be used as a set of horizontal oil cylinder assemblies and are connected to one of the proportional directional control valves 9; the second horizontal oil cylinder 2 and the fourth horizontal oil cylinder 5 can be used as another set of horizontal oil cylinder assemblies and are connected to another proportional directional control valve 9. The first displacement sensor 23 and the second displacement sensor 6 monitor the extension distances of the pistons of the horizontal oil cylinders and the vertical oil cylinder 3 in real time, so that the control system 17 can further calculate the rotation angle of the movable fixing frame 7.

[0032] Specifically, the control system 17 first controls the vertical oil cylinder 3 to move upward through the proportional directional control valve 9 to move the movable fixing frame 7. Then, the extension distance of the piston rod of the vertical oil cylinder 3 is set through the second displacement sensor 6. The rotation compensator is placed at the center of the rotation test machine, and then the vertical oil cylinder 3 is lowered. Using the principle of couple, thrust and tension are respectively applied to the four horizontal oil cylinders on both sides of the movable fixing frame 7, so that the rotation compensator controls the straight line where the oil cylinder sling is located as the rotation axis to perform reciprocating rotation, and the rotation angle is within ±25°. When the number of test times reaches the set number, the equipment stops running.

[0033] Among them, each set of horizontal oil cylinder assemblies is controlled by one of the proportional directional control valves 9, and oil is supplied or returned to the horizontal oil cylinder assemblies at the same time, so that each set of horizontal oil cylinder assemblies can achieve pressure self-balancing and synchronous actions. The control system 17 detects the extension distance of the piston rod of the horizontal oil cylinder in real time through the first displacement sensor 23 to determine its position. When the position deviation of the horizontal oil cylinder exceeds the system setting value, the control system 17 adjusts the input current of the proportional solenoid valve in the proportional directional control valve 9, and then adjusts the extension distance of the piston rod of the horizontal oil cylinder to make its position not exceed the tolerance, so as to achieve the coordinated action of the two sets of horizontal oil cylinders.

[0034] The rotation test machine hydraulic system described in this application can not only use the vertical oil cylinder 3 with an internal displacement sensor to drive the movable fixing frame 7 to move up and down and be fixed, so as to realize the installation of rotation compensators of multiple sizes; but also use a proportional directional control valve 9 with electrical feedback and horizontal oil cylinders with high-precision internal displacement sensors. Through two-layer closed-loop feedback, the synchronous movement of the two sets of horizontal oil cylinder assemblies and the precise control of the rotation angle are realized, and the error is controlled within ±0.1°, so as to solve the problem that the two sets of horizontal oil cylinders cannot act in coordination and the rotation angle cannot be accurately controlled.

[0035] In some embodiments, the control assembly further includes two shuttle valves 12; each shuttle valve 12 is disposed between the horizontal oil cylinder assembly and the proportional directional valve 9; the shuttle valve 12 is connected to the axial piston pump 15 through a hydraulic pipeline to feedback the detected load pressure signal to the control unit of the axial piston pump 15 in real time.

[0036] It should be understood that the shuttle valve 12 is a valve that returns the relatively higher of the two pressures to the control system 17. Disposing the shuttle valve 12 on the hydraulic pipeline between the horizontal oil cylinder assembly and the proportional directional valve 9 can be used to detect the load pressure signal. The shuttle valve 12 also has a feedback function and can feedback the detected load pressure signal to the control unit of the axial piston pump 15 in real time, so that the control unit of the axial piston pump 15 dynamically adjusts the working pressure and displacement of the axial piston pump 15 according to the load pressure signal, ensuring that the pressure difference between the inlet end and the outlet end of the proportional directional valve 9 is maintained at a preset constant value, thereby optimizing the efficiency and stability of the hydraulic system.

[0037] In some embodiments, the control assembly further includes a balance valve 8; the balance valve 8 is disposed between the vertical oil cylinder 3 and the proportional directional valve 9 to regulate and control the hydraulic flow of the vertical oil cylinder 3.

[0038] It should be understood that the balance valve 8 is a valve with a special function. The balance valve 8 can not only prevent the vertical oil cylinder 3 from sliding down at an excessive speed during the extension process, but also lock at any position to play a safety protection role.

[0039] In some embodiments, the control assembly further includes a normally open electromagnetic overflow valve 10; the normally open electromagnetic overflow valve 10 is disposed between the oil pump motor unit and the proportional directional valve 9 and is in a normally open state.

[0040] It should be understood that the normally open electromagnetic overflow valve 10 is an electromagnetic-driven valve, which can drive the valve core to open and close based on the electromagnetic force generated by the electromagnetic coil. The normally open electromagnetic overflow valve 10 can not only enable the oil pump motor unit to start under no-load, but also unload the system when the actuator is on standby during the working process, so as to reduce the heating of the oil fluid and save energy.

[0041] In some embodiments, the proportional directional valve 9 includes a proportional electromagnet, a spool valve, a valve body, valve ports, and a displacement sensor; the spool valve is disposed inside the valve body; the control system 17 is electrically connected to the proportional electromagnet to control the proportional electromagnet to drive the spool valve to move inside the valve body, thereby changing the opening and closing states of the valve ports; the control system 17 is electrically connected to the displacement sensor to control the displacement sensor to detect the position of the spool valve.

[0042] It should be understood that the proportional solenoid is used to generate electromagnetic force according to the received electrical signal to drive the spool to move within the valve body. The magnitude of the electrical signal is proportional to the electromagnetic force, thereby achieving the control of hydraulic flow rate and direction. The spool adjusts the flow direction and flow rate of the hydraulic oil by changing the opening degree of the valve port, and the position of the spool is controlled by the proportional solenoid. The displacement sensor is used to detect the actual position of the spool and feedback this position information to the control system to achieve closed-loop control. The valve body is the main structure of the proportional directional valve 9, provided with multiple valve ports for connecting different hydraulic oil circuits. The movement of the spool within the valve body will change the opening and closing states of these valve ports. Among them, the proportional directional valve 9 is electrically connected to the control system, receives the electrical signal from the control system, and is hydraulically connected to other components in the system to achieve the control of hydraulic flow rate and direction.

[0043] Specifically, the control system 17 can control the displacement of the proportional solenoid in the proportional directional valve 9 through the magnitude of the current of the feedback electrical signal, and at the same time manipulate the spool in the proportional directional valve 9 to achieve changes in direction and flow rate. The displacement sensor inside the proportional directional valve 9 detects the position of the spool. The shuttle valve 12 feeds back the load pressure in the system to the control unit of the axial piston pump 15. The pressure and displacement of the axial piston pump 15 are adjusted according to the signal fed back by the shuttle valve 12 to keep the pressure difference at both ends of the proportional directional valve 9 constant, and the rotational speed of the movable fixed frame 7 will not change with the load.

[0044] The proportional directional valve 9 realizes the precise control of the fluid flow direction and speed through the close cooperation of the proportional solenoid, spool, valve body, valve port and displacement sensor. At the same time, the electrical connection between the control system 17 and these components enables the system to monitor and adjust the state of the spool in real time, thereby achieving high-precision and high-stability fluid control.

[0045] In some embodiments, the hydraulic system of the rotary testing machine further includes auxiliary components; the auxiliary components include an oil suction filter 11, an oil return filter 13 and an oil tank 14; the liquid inlet end of the oil suction filter 11 is communicated with the oil tank 14, and the liquid outlet end of the oil suction filter 11 is connected to the axial piston pump 15; the liquid inlet end of the oil return filter 13 is connected to the proportional directional valve 9, and the liquid outlet end of the oil return filter 13 is communicated to the oil tank 14.

[0046] It should be understood that the oil tank 14 is used to store hydraulic oil and plays the role of heat dissipation and sedimentation of impurities. The oil suction filter 11 and the oil return filter 13 are used to filter impurities in the oil fluid to protect the hydraulic system from pollution.

[0047] The impurities and particulate matters in the oil can be removed through the oil suction filter 11 and the oil return filter 13, protecting key components, improving the quality of the oil, and thus ensuring that the system can operate stably and efficiently in the long term.

[0048] In some embodiments, the auxiliary components further include a cooler 18, a liquid level relay 20, a liquid level gauge 21, and an air filter 22; the cooler 18, the liquid level relay 20, the liquid level gauge 21, and the air filter 22 are all arranged on the fuel tank 14.

[0049] It should be understood that the cooler 18 is arranged beside the fuel tank 14 to adjust the temperature of the oil and prevent the performance of the oil from degrading or damaging system components due to excessive temperature. The liquid level relay 20 is arranged on the fuel tank 14 and is used to monitor the liquid level of the oil in the fuel tank 14 and send an electrical signal when the liquid level reaches a set value to control the start and stop of the oil pump or issue an alarm. The liquid level gauge 21 is arranged on the fuel tank 14 and is used to visually display the height of the liquid level of the oil in the fuel tank 14, facilitating the operator to understand the amount of oil at any time. The air filter 22 is arranged on the fuel tank 14 and is used to filter the air entering the fuel tank 14 and remove impurities such as dust and moisture therein.

[0050] The cooler 18, the liquid level relay 20, the liquid level gauge 21, and the air filter 22 cooperate together through their respective functions, improving the stability, safety, automation level, and oil quality of the system, and providing a strong guarantee for the long-term stable operation of the system.

[0051] In some embodiments, the control components further include a check valve; the inlet of the check valve is communicated with the oil pump motor unit, and the outlet of the check valve is communicated with the proportional directional valve 9.

[0052] It should be understood that a check valve is a valve that automatically opens and closes the valve flap relying on the flow of the medium itself to prevent the reverse flow of the medium.

[0053] The inlet of the check valve is communicated with the oil pump motor unit, capable of receiving the high-pressure oil from the oil pump motor unit in a timely manner and stably transmitting it to subsequent hydraulic components. The outlet of the check valve is communicated with the proportional directional valve 9, and then the flow rate and direction of the oil can be precisely adjusted through the proportional directional valve 9 according to the control requirements of the system, thereby achieving precise control of the speed and movement direction of the actuator. This connection method can make the hydraulic system operate more efficiently, improving the response speed and control accuracy of the system.

[0054] In some embodiments, the auxiliary component further includes a pressure sensor 19; the pressure sensor 19 is connected between the proportional directional valve 9 and the one-way valve; the control system 17 is electrically connected to the pressure sensor 19 to measure the pressure in the actuator assembly through the pressure sensor 19, and then calculate the torque of the horizontal oil cylinder.

[0055] It should be understood that the pressure sensor 19 is a device that converts a pressure signal into an electrical signal and can accurately measure pressure changes. The pressure sensor 19 can measure the pressure signal in the actuator assembly in real time, convert it into an electrical signal and send it to the control system 17. The control system 17 then converts the electrical signal into a pressure signal and can calculate the torque applied by the horizontal oil cylinder through the position of the piston rod of the horizontal oil cylinder.

[0056] The pressure sensor 19 is connected between the proportional directional valve 9 and the one-way valve, can capture the system pressure change in the first time and feedback it to the control system 17, measure the actuator pressure in real time and accurately, and provide accurate data for torque conversion. The control system 17 is electrically connected to the pressure sensor 19, and can quickly convert the pressure signal into the torque of the horizontal oil cylinder to achieve precise control.

[0057] As can be seen from the above technical solutions, the embodiment of the present application provides a hydraulic system for a rotary testing machine for rotary compensator detection, including: an oil pump motor unit, a control component and an actuator component; the oil pump motor unit includes an axial piston pump 15 and a motor 16; the axial piston pump 15 and the motor 16 are connected by a coupling; the actuator component includes two groups of horizontal oil cylinder assemblies and a vertical oil cylinder 3; the two groups of horizontal oil cylinder assemblies are arranged in parallel at both ends of the movable fixing frame 7 of the rotary testing machine, and one end of the piston rod of the vertical oil cylinder 3 is fixedly connected to the movable fixing frame 7; the control component includes a control system 17 and three proportional directional valves 9; one of the proportional directional valves 9 is connected to the vertical oil cylinder 3; the other two proportional directional valves 9 are respectively connected to the two groups of horizontal oil cylinder assemblies, and each group of horizontal oil cylinder assemblies consists of two horizontal oil cylinders at diagonals; one of the horizontal oil cylinders in the two groups of horizontal oil cylinder assemblies is internally provided with a first displacement sensor 23, the vertical oil cylinder 3 is internally provided with a second displacement sensor 6, and the control system 17 is electrically connected to the proportional directional valve 9, the first displacement sensor 23 and the second displacement sensor 6 respectively. To solve the problem that the two groups of horizontal oil cylinders cannot act in coordination and the rotation angle cannot be accurately controlled.

[0058] For the similar parts between the embodiments provided in this application, reference can be made to each other. The specific embodiments provided above are only several examples under the general concept of this application and do not constitute a limitation on the protection scope of this application. For those skilled in the art, any other embodiments extended based on the solution of this application without creative efforts fall within the protection scope of this application.

Claims

1. A rotary testing machine hydraulic system for rotary compensator detection, characterized in that: include: Oil pump motor unit, control components and actuator components; The oil pump motor unit comprises an axial piston pump (15) and an electric motor (16); the axial piston pump (15) and the electric motor (16) are connected via a coupling; The actuator assembly comprises two groups of horizontal cylinder assemblies and a vertical cylinder (3); the two groups of horizontal cylinder assemblies are arranged in parallel at two ends of a movable fixed frame (7) of the rotary testing machine, and one end of the piston rod of the vertical cylinder (3) is fixedly connected to the movable fixed frame (7); The control assembly comprises a control system (17) and three proportional reversing valves (9); one of the proportional reversing valves (9) is connected to the vertical oil cylinder (3); the other two proportional reversing valves (9) are respectively connected to two groups of horizontal oil cylinder assemblies, each group of horizontal oil cylinder assemblies is composed of two horizontal oil cylinders at diagonally opposite angles; One of the two groups of horizontal cylinder assemblies has a first displacement sensor (23) built into it, and the vertical cylinder (3) has a second displacement sensor (6) built into it, and the control system (17) is electrically connected to the proportional reversing valve (9), the first displacement sensor (23), and the second displacement sensor (6), respectively.

2. The rotary compensator hydraulic system according to claim 1, characterized in that: The control assembly also includes two shuttle valves (12); Each shuttle valve (12) is arranged between the horizontal oil cylinder assembly and the proportional reversing valve (9); the shuttle valve (12) is connected to the axial piston pump (15) via a hydraulic pipeline so as to feed back the detected load pressure signal to the control unit of the axial piston pump (15) in real time.

3. The rotary compensator testing machine hydraulic system according to claim 1, characterized in that: The control assembly further comprises a balancing valve (8); The balancing valve (8) is arranged between the vertical oil cylinder (3) and the proportional reversing valve (9) to adjust and control the hydraulic flow of the vertical oil cylinder (3).

4. The rotary compensator testing machine hydraulic system according to claim 1, characterized in that: The control assembly further comprises a normally open electromagnetic overflow valve (10); The normally open electromagnetic overflow valve (10) is arranged between the oil pump motor unit and the proportional reversing valve (9) and is in a normally open state.

5. The rotary compensator testing machine hydraulic system according to claim 1, characterized in that: The proportional reversing valve (9) comprises a proportional solenoid, a slide valve, a valve body, a valve port and a displacement sensor; The slide valve is arranged inside the valve body; the control system (17) is electrically connected to the proportional solenoid to control the proportional solenoid to drive the slide valve to move inside the valve body, thereby changing the open / closed state of the valve port; the control system (17) is electrically connected to the displacement sensor to control the displacement sensor to detect the position of the slide valve.

6. The rotary compensator testing machine hydraulic system according to claim 1, characterized in that: It also includes auxiliary components; the auxiliary components include an oil suction filter (11), an oil return filter (13) and an oil tank (14); The liquid inlet end of the oil suction filter (11) is connected to the oil tank (14), and the liquid outlet end of the oil suction filter (11) is connected to the axial piston pump (15); the liquid inlet end of the oil return filter (13) is connected to the proportional reversing valve (9), and the liquid outlet end of the oil return filter (13) is connected to the oil tank (14).

7. The rotary testing machine hydraulic system for rotary compensator detection according to claim 6, characterized in that: The auxiliary components also include a cooler (18), a liquid level relay (20), a liquid level meter (21), and an air filter (22); The cooler (18), the liquid level relay (20), the liquid level meter (21), and the air filter (22) are all arranged on the oil tank (14).

8. The rotary compensator testing machine hydraulic system according to claim 6, characterized in that: The control assembly also includes a one-way valve; The inlet of the one-way valve is communicated with the oil pump motor unit, and the outlet of the one-way valve is communicated with the proportional reversing valve (9).

9. The rotary testing machine hydraulic system for rotary compensator detection according to claim 8, characterized in that: The auxiliary component also includes a pressure sensor (19); The pressure sensor (19) is connected between the proportional reversing valve and the one-way valve; the control system (17) is electrically connected to the pressure sensor (19) so as to measure the pressure in the actuator through the pressure sensor (19) and thereby convert the torque of the horizontal cylinder.

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