An anti-fatigue test modular combined oil supply system and control method

Abstract

The application relates to a modular combination oil supply system for an anti-fatigue test module and a control method, and relates to test equipment. The modular combination oil supply system comprises multiple power units, and the power units comprise a power motor, a power oil pump, a cooling oil pump and a pump pressure regulating valve block. The power motor is arranged in an oil tank of a machine body through a power mounting seat. The power oil pump and the cooling oil pump are connected with the side of the power motor and are driven to rotate by the power motor. The pump pressure regulating valve block is used for regulating the oil inlet pressure of the power oil pump. In the application, a modular power unit structure design is adopted. According to the test working conditions of the parts to be tested, the configuration number of servo oil cylinders and the actual oil supply flow demand, a corresponding number of power units can be flexibly selected and started, different specifications and different test requirements of the parts can be adapted to the anti-fatigue test, and the overall universality and scene adaptation capability of the equipment can be effectively improved.

Description

Technical Field

[0001] This invention relates to testing equipment, and more particularly to a modular combined oil supply system and control method for fatigue testing. Background Technology

[0002] All components used in high-safety equipment such as road vehicles, aviation, and marine equipment must undergo rigorous fatigue performance testing before being put into use. This verifies the reliability and structural stability of the components under long-term reciprocating operating conditions. Hydraulic servo cylinders are commonly used as the power actuators in fatigue testing. However, different specifications and types of test components have significantly different testing conditions, requiring varying numbers of servo cylinders and different overall output flow and supply pressure requirements for the servo hydraulic oil supply system.

[0003] Currently, traditional hydraulic oil supply systems for fatigue testing are mostly integrated fixed structures. The overall oil supply flow and output power are uniformly configured according to the maximum test conditions, making it impossible to flexibly adjust the oil supply scale according to actual test needs. When conducting routine tests with low flow rates and a small number of cylinders, the entire oil supply system still needs to operate at full load. This not only results in a large amount of unnecessary energy consumption and high overall energy consumption of the equipment, but also causes a sharp increase in the heat generated by the hydraulic system during prolonged redundant operation. Rapidly rising oil temperature can easily lead to a series of problems such as deterioration of oil performance, accelerated aging of seals, and shortened service life of hydraulic components, seriously affecting the stability of the test and the service life of the equipment.

[0004] Furthermore, traditional oil supply systems suffer from severe mutual interference between their various supply circuits, resulting in poor pressure regulation stability. They struggle to achieve smooth pressure ramp-up control from low to high pressure, lack sufficient accuracy in test pressure control, and cannot precisely match the requirements of high-precision fatigue testing. Their versatility and adaptability are also poor, making it difficult to meet the flexible application needs of fatigue testing for various types of components under different operating conditions. Therefore, developing a modular oil supply system that can be flexibly combined, deployed on demand, is energy-efficient, and provides stable pressure regulation has become a pressing technical challenge in the field of fatigue testing. Summary of the Invention

[0005] To address the above problems, this invention provides a modular combined oil supply system and control method for fatigue testing that is compact in structure, occupies little space, can be flexibly combined, can be deployed on demand, is energy-saving and low-consumption, and has stable pressure regulation.

[0006] The technical solution of this invention is: A modular combined oil supply system for fatigue testing, comprising: The power unit is equipped with multiple components, including a power motor, a power oil pump, a cooling oil pump, and a pump pressure regulating valve block. The power motor is mounted in the oil tank of the machine body via a power mounting bracket; the power oil pump and the cooling oil pump are connected to the side of the power motor and are driven to rotate by the power motor; the pump pressure regulating valve block is used to regulate the oil inlet pressure of the power oil pump. A hydraulic valve block assembly, connected to the power unit, is installed on the outside of the oil tank; it includes a hydraulic valve block, a power oil pump check valve, an outlet pipe check valve, a proportional relief valve, and a cooling pipe check valve; the hydraulic valve block is provided with a main pressure flow channel, a return oil cooling flow channel, a pressure control unloading flow channel, and a pressure detection flow channel; The main pressure flow channel receives oil from each of the power oil pumps, and after being collected, it outputs the oil from the pressure outlet to the actuator through the outlet pipe check valve, which is the high-pressure oil supply channel of the system. The oil return cooling channel receives oil through the oil return inlet receiving system, and after passing through the cooling pipe check valve, it is guided back to the oil tank from the internal channel of the hydraulic valve block to prevent the return oil pressure from impacting and damaging the cooling oil pump. The pressure control unloading channel includes a proportional overflow valve located on the pressure control unloading channel and connected to the main pressure channel. The pressure detection channel is equipped with a pressure sensor, which is connected to the main pressure channel to collect system pressure signals in real time. Water cooling system, including temperature control valve and radiator; The temperature control valve is connected at one end to the water inlet and at the other end to the inlet connecting block of the radiator; the outlet connecting block of the radiator is connected to the water outlet; the hydraulic valve block guides the oil flowing through the cooling pipe check valve into the heat dissipation oil inlet of the radiator, and finally flows out from the heat dissipation oil outlet of the radiator into the oil tank.

[0007] Specifically, the body includes: The base is divided into a water-cooled mounting area and a power mounting area by a cover. The upper cover is hinged to the base on one side, and locked to the base on the other side by a switch.

[0008] Specifically, the upper cover includes a first cover and a second cover arranged side by side at intervals; Nitrogen springs are respectively provided between the first and second covers and the base.

[0009] Specifically, the oil tank is equipped with a temperature switch and a level switch.

[0010] Specifically, the top of the fuel tank is equipped with a refueling unit, and the side is equipped with multiple connection interfaces; The refueling unit includes: An observation window is located on the top of the fuel tank; The refueling unit cover is detachably mounted on the top of the fuel tank; The return oil filter is fixedly installed on the cover plate of the refueling unit, and has a side connection thereto. The return oil valve block is provided with a return oil inlet connector.

[0011] Specifically, the refueling unit cover is equipped with a temperature sensor, a liquid level sensor, and an air filter.

[0012] Specifically, the pump pressure regulating valve block is used to regulate the pressure of the power oil pump, and is integrated with a pump pressure gauge and a pump pressure regulating valve.

[0013] Specifically, the power oil pump, power motor, and cooling oil pump are mounted on the power mounting base via shock-absorbing pads.

[0014] Specifically, the power motor is an oil-immersed motor, which is installed inside the oil tank.

[0015] A control method for a modular combined oil supply system for fatigue testing includes the following steps: Step 1: Turn on system cooling The cooling water circuit is turned on, and the cooling water enters the radiator through the temperature control valve to establish a cooling cycle, preparing for the subsequent cooling of the hydraulic oil. Step 2: Single pump no-load start Select one of the power units on the touchscreen and press the start button. The power motor drives the power oil pump and the cooling oil pump to operate synchronously. At this time, the proportional relief valve is in the unloaded state. Main power oil circuit: The pressurized oil output by the power oil pump is regulated by the pump pressure regulating valve block and monitored by the pressure gauge, and then flows into the main oil circuit through the power oil pump check valve. Since the proportional relief valve is fully open, the pressure in the main oil circuit is only maintained at the unloading pressure to overcome the resistance of the valve and pipeline, and most of the oil flows directly back to the oil tank through the proportional relief valve. At this time, the outlet pipe check valve is in the reverse cut-off state, and there is no effective pressure output at the system output port. Cooling oil circuit: The cooling oil pump operates synchronously, and the pressurized oil output by the cooling oil pump enters the radiator through the cooling pipe check valve and then flows to the oil tank through the return oil filter. Step 3: Adjust the pressure of the relief valve and preset the system pressure. Gradually increase the set pressure of the proportional relief valve until its pressure value is higher than that of the test cylinder. At this time, the proportional relief valve is in the "overflow standby" state, providing the system with the highest pressure protection. Step 4: Single pump pressure setting Adjust the pump pressure regulating valve of the power unit to make the pump pressure gauge display value stabilize at the target pressure; Step 5: Other power settings Repeat steps two through four to start and debug the remaining power units in sequence, and set the pump pressure regulating valve of each pump to the required pressure.

[0016] Step Six: The cooling oil pump circulates. The cooling oil pump operates synchronously with the power oil pump, and the low-pressure cooling oil it outputs enters the oil tank from the cooling oil pump outlet, the cooling pipe check valve, the radiator, and the return oil filter. When the test cylinder is obstructed by the test sample, causing an increase in pressure at the power pump, the flow rate of the pressure compensation pump rapidly decreases to a minimum, stopping the supply of oil to the test cylinder. At the same time, the pressure sensor sends a signal, and the proportional relief valve is unloaded, ensuring the safety of the test sample and equipment.

[0017] This invention employs a modular power unit structure design, allowing for flexible selection and activation of the corresponding number of power units based on the test conditions of the components under test, the number of servo cylinders, and the actual oil supply flow requirements. This enables compatibility with fatigue testing of components of different specifications and testing needs, effectively improving the overall versatility and adaptability of the equipment. Simultaneously, an independent water-cooling system is integrated, using a temperature control valve to adjust the cooling water flow as needed. Through a radiator, oil-water convection heat exchange is achieved, rapidly cooling the hydraulic oil, stabilizing the system's operating oil temperature, delaying oil deterioration and seal aging, and extending the service life of the entire hydraulic equipment.

[0018] This design abandons the traditional integrated full-load oil supply mode, instead using power units on demand, eliminating the need for the entire machine to operate at full power. This significantly reduces wasted power loss and effectively saves energy consumption. Simultaneously, it avoids the excessive heat buildup caused by redundant operation, reducing the overall heat generation of the hydraulic system at its source and mitigating the problem of excessively high oil temperature under servo control conditions. Furthermore, by integrating a proportional relief valve into the hydraulic valve block, the oil supply system can achieve a slow and smooth pressurization from low to high pressure, with no shock during pressure switching. Combined with the pump pressure regulating valve block for coordinated pressure regulation, the system pressure regulation is linear and stable, meeting the pressure control requirements of high-precision fatigue testing and ensuring accurate and reliable test data. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the structure of the present invention; Figure 2 This is a schematic diagram of the three-dimensional structure after multiple power components are assembled; Figure 3 It is a schematic diagram of the three-dimensional structure of the organism; Figure 4 This is a schematic diagram of the three-dimensional structure of the shell. Figure 1 ; Figure 5 This is a schematic diagram of the three-dimensional structure of the shell. Figure 2 ; Figure 6 This is a three-dimensional structural diagram of the water-cooled installation area and the power installation area; Figure 7 This is a schematic diagram of the three-dimensional structure of the fuel tank; Figure 8 This is a schematic diagram of the three-dimensional structure of the refueling unit; Figure 9 This is a schematic diagram of the three-dimensional structure of the power unit. Figure 1 ; Figure 10 This is a schematic diagram of the three-dimensional structure of the power unit. Figure 2 ; Figure 11 This is a top view of multiple power units assembled together; Figure 12 This is a schematic diagram of the installation status of the hydraulic valve block assembly and the water cooling system. Figure 1 ; Figure 13 This is a schematic diagram of the installation status of the hydraulic valve block assembly and the water cooling system. Figure 2 ; Figure 14 This is a 3D schematic diagram of a hydraulic valve block assembly. Figure 1 ; Figure 15 This is a 3D schematic diagram of a hydraulic valve block assembly. Figure 2 ; Figure 16 This is a side view of the hydraulic valve block assembly; Figure 17 This is a 3D schematic diagram of a hydraulic valve block assembly. Figure 3 ; Figure 18 This is a 3D diagram of a water cooling system. Figure 1 ; Figure 19 This is a 3D diagram of a water cooling system. Figure 2 ; Figure 20 This is the hydraulic schematic diagram of the power unit; Figure 21 This is a schematic diagram of the combined hydraulic system of four power units; In the diagram, 100 is the power unit, 110 is the motor, 120 is the oil pump, 130 is the cooling oil pump, 140 is the pump pressure regulating valve block, and 150 is the power mounting base. 200 is the engine block; 201 is the fuel tank; 202 is the temperature switch; 203 is the level switch; 204 is the refueling unit; 2041 is the observation window; 2042 is the refueling unit cover; 2043 is the return oil filter; 2044 is the return oil valve block; 2045 is the return oil inlet connector; 2046 is the temperature sensor; 2047 is the level sensor; 2048 is the air filter; 205 is the multi-unit connection interface; 210 is the base; 211 is the water-cooled mounting area; 212 is the power mounting area; 220 is the upper cover; 221 is the first cover; 222 is the second cover; 230 is the nitrogen spring. 300 is a hydraulic valve block assembly, 310 is a hydraulic valve block, 320 is a power oil pump check valve, 330 is an outlet pipe check valve, 331 is a pressure outlet, 332 is a return oil inlet, 340 is a proportional relief valve, 350 is a cooling pipe check valve, and 360 is a pressure sensor. 400 is the water cooling system, 401 is the water inlet, 402 is the water outlet, 410 is the temperature control valve, 420 is the radiator, 421 is the inlet connector, 422 is the outlet connector, 423 is the radiator oil inlet, and 424 is the radiator oil outlet. Detailed Implementation

[0020] Embodiments of the present invention are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0021] In the description of this invention, it should be understood that the terms "upper," "lower," "left," "right," "vertical," and "horizontal," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. In the description of this invention, unless otherwise stated, "a plurality of" means two or more.

[0022] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0023] The following is for reference. Figure 1-21Describe embodiments of the present invention; For high-safety-level equipment such as road vehicles, aviation, and maritime equipment, all supporting components must undergo fatigue performance testing before leaving the factory. Different testing conditions for different components have varying requirements for the number of hydraulic servo cylinders and the output flow rate of the servo hydraulic oil supply system. To achieve a single oil supply system compatible with multiple component testing scenarios and meeting the requirements of various test conditions, the power unit 100 in this project adopts a modular structure design. Based on the actual number of cylinders used and the required oil flow rate, the corresponding power unit can be selectively activated, effectively saving energy and significantly reducing the heat generated during equipment operation. Therefore, this project developed a modular combined oil supply system for fatigue testing, with each power unit 100 designed to match the rated flow rate of a single servo valve. Considering the industry parameter that the maximum flow rate of a conventional servo valve can reach 600L / min, and taking into account the limitations of on-site factory installation space, this embodiment configures 6 independent power units, such as... Figure 1-2 As shown, it consists of 4 power units, with the other two positions being empty.

[0024] A modular combined oil supply system for fatigue testing, comprising: The power unit 100 is equipped with multiple components, including a power motor 110, a power oil pump 120, a cooling oil pump 130, and a pump pressure regulating valve block 140. The power motor 110 is an oil-immersed motor, which is installed in the oil tank 201 of the machine body 200 via a power mounting base 150; the power oil pump 120 and the cooling oil pump 130 are connected to the side of the power motor 110 and are driven to rotate by the power motor 110; the pump pressure regulating valve block 140 is fixedly installed on the top of the power mounting base 150 and is used to regulate the oil inlet pressure of the power oil pump 120. Specifically, the pump pressure regulating valve block 140 is used to regulate the pressure of the power oil pump, and integrates a pump pressure gauge and a pump pressure regulating valve. The pump pressure gauge is connected to the main oil circuit through a pressure gauge interface, the oil inlet of the pump pressure regulating valve is connected to the main oil circuit, and the oil return port is connected to the oil tank through the oil return port. In this embodiment, the pump pressure regulating valve block is an integrated hydraulic valve block, integrating pressure monitoring and pressure regulation functions into one unit. The pressurized oil output from the power oil pump enters the valve block, providing pressure signals to the pump pressure gauge and the pump pressure regulating valve respectively. When the system pressure reaches the set value of the pump pressure regulating valve, the valve opens to overflow, guiding the excess flow back to the oil tank through port R, realizing pressure protection. At the same time, the pump pressure gauge displays the current working pressure in real time, facilitating operators to monitor the system operating status.

[0025] The power oil pump 120 and cooling oil pump 130 are respectively inserted into the hollow shaft of the motor. After the power oil pump 120, power motor 110, and cooling oil pump 130 are assembled, they are mounted on the power mounting base 150 through shock-absorbing pads. The power motor 110 is an oil-immersed motor, installed in the oil tank 201, and is an internally inserted motor. The power oil pump 120 is a pressure-compensated oil pump; when the pressure reaches the set pressure, the pump flow rate rapidly decreases to the minimum flow rate, approaching zero. During operation, the pressure of the oil supply system gradually increases steplessly from zero to low pressure and then to high pressure, ensuring that the test sample and equipment are not damaged.

[0026] like Figure 12-17 As shown, the hydraulic valve block assembly 300 is connected to the power unit 100 and installed on the outside of the oil tank 201; it includes a hydraulic valve block 310, a power oil pump check valve 320, an outlet pipe check valve 330, a proportional relief valve 340, and a cooling pipe check valve 350. The hydraulic valve block 310 is provided with: The main pressure flow channel of the oil inlet-pressure outlet receives oil from each of the power oil pumps 120, and after being collected, it outputs the oil to the actuator from the pressure outlet 331 through the outlet pipe check valve 330. It is the high-pressure oil supply channel of the system. The return oil inlet—the return oil cooling channel of the cooling pipe check valve receives system return oil through the return oil inlet 332, and after passing through the cooling pipe check valve 350, it is guided back to the oil tank from the internal channel of the hydraulic valve block 310 to prevent the return oil pressure from impacting and damaging the cooling oil pump 130. The pressure control unloading channel has a proportional relief valve 340 installed on it and connected to the main pressure channel. When the pressure reaches the set value, the proportional relief valve opens to unload the high-pressure oil and return it to the system, thereby achieving system pressure stabilization and protection.

[0027] The pressure detection channel is equipped with a pressure sensor 360°, which is connected to the main pressure channel to collect system pressure signals in real time and feed them back to the control unit, so as to achieve the purpose of "unloading and stopping when the pressure reaches the set value".

[0028] The proportional relief valve 340 integrated on the hydraulic valve block 310 is used to achieve smooth and linear pressure increase control of the oil supply system from low pressure to high pressure range (pressure range, such as 4~21MPa); the one-way valve 320 of the power oil pump can prevent impact damage to the pump body when the oil supply system pressure rises, and effectively isolate the pressure interference between each power unit to ensure independent and stable operation of the system.

[0029] like Figure 18-19 As shown, the water cooling system 400 includes a temperature control valve 410 and a radiator 420; Wherein, one end of the temperature control valve 410 is connected to the water inlet 401, and the other end is connected to the inlet connecting block 421 of the radiator 420; the outlet connecting block 422 of the radiator 420 is connected to the water outlet 402. The hydraulic valve block 310 guides the oil flowing through the cooling pipe check valve 350 into the heat dissipation oil inlet 423 of the radiator 420, and finally flows out from the heat dissipation oil outlet 424 of the radiator 420 into the oil tank.

[0030] To control the operating temperature rise of the servo system, a water cooling system is configured in this case. The temperature control valve 410 adjusts the cooling water flow in real time according to the oil temperature of the hydraulic system, achieving on-demand cooling. The inlet connector 421 and outlet connector 422 respectively connect the inlet and outlet of the two sets of radiators 420. Cooling water enters the temperature control valve 410 through the inlet 401, exchanges heat with the radiator 420, and then flows out from the outlet 402. The high-temperature oil from the hydraulic system enters through the cooling oil inlet 423 of the radiator 420, cools down through convection with the cooling water, and then returns to the oil tank from the cooling oil outlet 424, thus achieving efficient temperature control of the servo system.

[0031] The machine body 200 includes: The base 210 is divided into a water-cooled mounting area 211 and a power mounting area 212 by a cover; the front of the water-cooled mounting area 211 is open for mounting the control cabinet; the power mounting area 212 has the following features: Figure 7 The oil tank 201 shown contains the power unit 100; the water-cooled installation area 211 is used to install the hydraulic valve block assembly 300 and the water-cooling system 400; the power installation area 212 is used to install the power unit 100; after installation, it is closed by the upper cover 220; the base 210 is made of rubber and is used to support and dampen the power unit 100; the covers are separated by sound insulation cotton to reduce noise.

[0032] The upper cover 220 is hinged to the base 210 on one side, and locked to the base 210 after being closed via a switch on the other side. The switch used in this case is a magnetic switch 240; other types of door switches are also within the scope of protection of this case. The magnetic switch 240 is used to secure the upper cover 220 to the base 210 when the upper cover 220 is closed. Multiple handles are provided on the upper cover 220 on the side of the magnetic switch 240 for easy opening.

[0033] The upper cover 220 includes a first cover 221 and a second cover 222 arranged side by side at intervals; Nitrogen springs 230 are respectively installed between the first cover 221 and the second cover 222 and the base 210. These nitrogen springs provide opening and closing assistance and suspension support for the first cover 221 and the second cover 222 during opening, while also buffering and damping the covers during closing to prevent hard impacts. Furthermore, they allow the first cover 221 and the second cover 222 to open independently and remain tightly fitted to the base after closing, reducing operational vibration and abnormal noise, and facilitating modular maintenance. Sound insulation cotton is installed between the first cover 221 and the second cover 222 to reduce noise.

[0034] The oil tank 201 is equipped with a temperature switch 202 and a level switch 203.

[0035] like Figure 7 As shown, the oil tank 201 is a welded component, while the surrounding columns are bent components, ensuring both the strength of the oil tank 201's perimeter and providing pipe support for installation. Temperature switch 202 detects the temperature inside the oil tank; if too high, an alarm is triggered. Level switch 203 monitors the oil level in the tank; a low level alarm triggers a shutdown. Multiple power units 100 are securely mounted on the reinforcing ribs of the oil tank 201.

[0036] The top of the fuel tank 201 is equipped with a refueling unit 204, and the side is equipped with a multi-connection interface 205 for connecting multiple fuel supply systems. The refueling unit 204 is used for refueling the filter and is securely mounted on the reinforcing ribs of the fuel tank; the refueling unit 204 includes: The observation window 2041 is made of transparent material and is located on the top of the oil tank 201; The refueling unit cover 2042 is detachably mounted on the top of the fuel tank 201, and in this case, it is located on the side of the observation window 2041. The return oil filter 2043 is fixedly installed on the cover plate 2042 of the refueling unit, and has a side part for connection with it. The oil return valve block 2044 is provided with an oil return inlet connector 2045.

[0037] The refueling unit cover 2042 is equipped with a temperature sensor 2046, a liquid level sensor 2047, and an air filter 2048.

[0038] The observation window 2041 and the refueling unit cover 2042 are fastened to the fuel tank 201. The observation window is made of tempered glass, facilitating observation of the fuel inside the fuel tank 201. The fuel from the two return inlet connectors 2045 converges into the return valve block 2044 and then enters the return filter 2043 for filtration. The temperature sensor 2046 measures the current fuel temperature, the level sensor 2047 measures the current fuel level, and the air filter 2048 serves as both the fuel filler port and the vent.

[0039] This hydraulic system is a four-pump parallel oil supply system, consisting of four independent power units including a power oil pump, a power motor, a cooling oil pump, a pressure regulating valve block, and a proportional relief valve. It can realize multi-pump parallel oil supply, independent pressure regulation of a single pump, closed-loop control of system pressure, and automatic oil temperature regulation. It is mainly used for performance debugging and working condition simulation of variable pumps with pressure compensation function.

[0040] Step 1: Turn on system cooling The cooling water circuit is opened, and the cooling water enters the radiator 420 through the temperature control valve 410 to establish a cooling cycle and prepare for the subsequent cooling of the hydraulic oil. Step 2: Single pump no-load start (no-pressure circulation) Select one of the power units 100 on the touch screen and press the start button. The power motor 110 drives the power oil pump 120 and the cooling oil pump 130 to operate synchronously. At this time, the proportional relief valve 340 is in the unloaded state (set to the minimum control current, valve port is fully open). Main power oil circuit: The pressurized oil output by the power oil pump 120 is regulated by the pump pressure regulating valve block 140 and monitored by the pressure gauge. Then, it flows into the main oil circuit through the power oil pump check valve 320. Since the proportional relief valve 340 is fully open, the pressure in the main oil circuit is only maintained at the unloading pressure to overcome the resistance of the valve and pipeline. Most of the oil flows directly back to the oil tank through the proportional relief valve 340. At this time, the outlet pipe check valve 330 is in the reverse cut-off state, and there is no effective pressure output at the system output port P.

[0041] Cooling oil circuit: The cooling oil pump 130 operates synchronously. The pressurized oil output by the cooling oil pump 130 enters the radiator 420 through the cooling pipe check valve 350 and then flows to the oil tank through the return oil filter 2043. Step 3: Adjust the pressure of the relief valve and preset the system pressure. Gradually increase the set pressure of the proportional relief valve 340 until its pressure value is higher than that of the test cylinder (e.g., 21 MPa). At this time, the proportional relief valve 340 is in the "overflow standby" state, providing the system with the highest pressure protection.

[0042] Step 4: Single pump pressure setting Adjust the pump pressure regulating valve block 140 of the power unit 100 to stabilize the displayed value of the pump pressure gauge at the target pressure (e.g., 21 MPa). At this time, the pump pressure regulating valve sets the maximum working pressure for a single pump to prevent pump overload.

[0043] With the pump pressure regulating valve already set to 21MPa, the flow rate changes of the power oil pump (pressure-compensated variable pump) can be observed through the observation window of the refueling unit by gradually increasing / decreasing the pressure of the proportional relief valve via the touch screen. When the system pressure is lower than the pump's set pressure (21MPa), the pump is in a low-pressure, high-flow state and outputs full-flow oil. When the system pressure reaches and stabilizes at the pump's set pressure (21MPa), the pump automatically switches to pressure compensation mode, reducing the flow rate to a minimum (close to zero) to achieve pressure maintenance and energy saving.

[0044] Step 5: Other power settings Repeat steps 2-4 to start and debug the remaining power units 100 in sequence, and set the pump pressure regulating valve block 140 of each pump to 21MPa.

[0045] The system can select between single-pump and multi-pump parallel oil supply according to operating conditions. During operation, a pressure sensor monitors the main oil circuit pressure in real time, a temperature control valve automatically adjusts the cooling water flow based on oil temperature, and a 2043 return oil filter continuously filters oil impurities to ensure stable and efficient system operation. Meanwhile, the power motor, power oil pump, and cooling oil pump are all installed inside the oil tank, immersed in the oil, minimizing noise at the source. The power unit is mounted on a base, surrounded by a housing with sound-absorbing cotton installed inside to further reduce noise.

[0046] Step Six: The cooling oil pump circulates. The cooling oil pump 130 operates synchronously with the power oil pump 120. The low-pressure cooling oil output by the pump enters the oil tank after passing through the outlet of the cooling oil pump 130, the cooling pipe check valve 350, the radiator 420, and the return oil filter 2043.

[0047] When the test cylinder's operation is obstructed by the test sample, causing an increase in pressure at the power oil pump 120, the flow rate of the pressure compensation oil pump rapidly decreases to a minimum, stopping oil supply to the test cylinder. Simultaneously, the pressure sensor sends a signal, and the proportional relief valve 340 is unloaded, ensuring the safety of the test sample and equipment. The touchscreen displays the current oil temperature, oil level, output pressure, and the opening degree of the temperature control valve in real time, and also features status monitoring, signal monitoring, and fault diagnosis functions. It can comprehensively monitor the current status of the oil supply system and quickly handle emergencies.

[0048] Regarding the information disclosed in this case, the following points need to be clarified: (1) The accompanying drawings of the embodiments disclosed in this case only involve the structures involved in the embodiments disclosed in this case. Other structures can refer to the general design. (2) Where there is no conflict, the embodiments and features disclosed in this case can be combined with each other to obtain new embodiments; The above are merely specific embodiments disclosed in this case, but the scope of protection of this disclosure is not limited thereto. The scope of protection disclosed in this case shall be determined by the scope of protection of the claims.

Claims

1. A modular combined oil supply system for fatigue testing, characterized in that, include: The power unit (100) is provided with multiple components, including a power motor (110), a power oil pump (120), a cooling oil pump (130), and a pump pressure regulating valve block (140). The power motor (110) is located inside the oil tank (201) of the machine body (200); the power oil pump (120) and the cooling oil pump (130) are connected to the side of the power motor (110) and are driven to rotate by the power motor (110); the pump pressure regulating valve block (140) is used to regulate the oil inlet pressure of the power oil pump (120); A hydraulic valve block assembly (300), connected to the power unit (100), is installed on the outside of the oil tank (201); it includes a hydraulic valve block (310), a power oil pump check valve (320), an outlet pipe check valve (330), a proportional relief valve (340), and a cooling pipe check valve (350); the hydraulic valve block (310) is provided with a main pressure flow channel, a return oil cooling flow channel, a pressure control unloading flow channel, and a pressure detection flow channel; The main pressure flow channel receives oil from each of the power oil pumps (120), and after being collected, it outputs the oil from the pressure outlet (331) to the actuator through the outlet pipe check valve (330), which is the high-pressure oil supply channel of the system. The return oil cooling channel receives system return oil through the return oil inlet (332), and after passing through the cooling pipe check valve (350), it is guided back to the oil tank from the internal channel of the hydraulic valve block (310) to prevent the return oil pressure from impacting and damaging the cooling oil pump (130). The pressure control unloading channel, wherein the proportional overflow valve (340) is provided on the pressure control unloading channel and is connected to the main pressure channel; The pressure detection channel is equipped with a pressure sensor (360) which is connected to the main pressure channel to collect system pressure signals in real time. Water cooling system (400), including temperature control valve (410) and radiator (420); One end of the temperature control valve (410) is connected to the water inlet (401), and the other end is connected to the inlet connecting block (421) of the radiator (420); the outlet connecting block (422) of the radiator (420) is connected to the water outlet (402); the hydraulic valve block (310) introduces the oil flowing through the cooling pipe check valve (350) into the heat dissipation oil inlet (423) of the radiator (420), and finally flows out from the heat dissipation oil outlet (424) of the radiator (420) and enters the oil tank; The body (200) includes: The base (210) divides the top into a water-cooled mounting area (211) and a power mounting area (212) through a cover. The upper cover (220) is hinged to the base (210) on one side, and locked to the base (210) by a switch on the other side after being closed; The upper cover (220) includes a first cover (221) and a second cover (222) arranged side by side at intervals. Nitrogen springs (230) are respectively provided between the first cover (221) and the second cover (222) and the base (210); The oil tank (201) is equipped with a refueling unit (204) on the top and multiple connection interfaces (205) on the side. The refueling unit (204) includes: An observation window (2041) is provided on the top of the oil tank (201); The refueling unit cover (2042) is detachably mounted on the top of the fuel tank (201); The return oil filter (2043) is fixedly installed on the cover plate (2042) of the refueling unit, and has a side part for connection with it. Oil return valve block (2044), wherein an oil return inlet connector (2045) is provided on the oil return valve block (2044); The refueling unit cover plate (2042) is equipped with a temperature sensor (2046), a liquid level sensor (2047), and an air filter (2048). The pump pressure regulating valve block (140) is used to regulate the pressure of the power oil pump and is equipped with a pump pressure gauge and a pump pressure regulating valve.

2. The modular combined oil supply system for fatigue testing according to claim 1, characterized in that, The oil tank (201) is equipped with a temperature switch (202) and a liquid level switch (203).

3. The modular combined oil supply system for fatigue testing according to claim 1, characterized in that, The power oil pump (120), power motor (110) and cooling oil pump (130) are mounted on the power mounting base (150) via shock-absorbing pads.

4. The modular combined oil supply system for fatigue testing according to claim 1, characterized in that, The power motor (110) is an oil-immersed motor, which is installed in the oil tank (201).

5. A control method for a modular combined oil supply system for fatigue testing, comprising the modular combined oil supply system for fatigue testing as described in claim 1, characterized in that, Includes the following steps: Step 1: Turn on system cooling The cooling water circuit is turned on, and the cooling water enters the radiator (420) through the temperature control valve (410) to establish a cooling cycle and prepare for subsequent hydraulic oil cooling. Step 2: Single pump no-load start Select one of the power units (100) on the touchscreen and press the start button. The power motor (110) drives the power oil pump (120) and the cooling oil pump (130) to operate synchronously. At this time, the proportional relief valve (340) is in an unloaded state. Main power oil circuit: The pressure oil output by the power oil pump (120) is regulated by the pump pressure regulating valve block (140) and monitored by the pressure gauge, and then flows into the main oil circuit through the power oil pump check valve (320). Since the proportional relief valve (340) is fully open, the pressure in the main oil circuit is only maintained at the unloading pressure to overcome the resistance of the valve and pipeline. Most of the oil flows directly back to the oil tank through the proportional relief valve (340). At this time, the outlet pipe check valve (330) is in the reverse cut-off state, and there is no effective pressure output at the system output port. Cooling oil circuit: The cooling oil pump (130) operates synchronously. The pressure oil output by the cooling oil pump (130) enters the radiator (420) through the cooling pipe check valve (350) and then flows to the oil tank through the return oil filter (2043). Step 3: Adjust the pressure of the relief valve and preset the system pressure. Gradually increase the set pressure of the proportional relief valve (340) so that its pressure value is higher than the pressure of the test cylinder. At this time, the proportional relief valve (340) is in the "overflow standby" state, providing the system with the highest pressure protection. Step 4: Single pump pressure setting Adjust the pump pressure regulating valve block (140) of the power unit (100) to make the displayed value of the pump pressure gauge stably reach the target pressure; Step 5: Other power settings Repeat steps two to four to start and debug the remaining power units (100) in sequence, and set the pump pressure regulating valve block (140) of each pump to the required pressure. Step Six: The cooling oil pump circulates. The cooling oil pump (130) operates synchronously with the power oil pump (120). The low-pressure cooling oil output by the pump enters the oil tank after passing through the outlet of the cooling oil pump (130), the cooling pipe check valve (350), the radiator (420), and the return oil filter (2043). When the test cylinder is obstructed by the test sample, causing an increase in pressure at the power oil pump (120), the flow rate of the pressure compensation oil pump rapidly decreases to a minimum, stopping the oil supply to the test cylinder. At the same time, the pressure sensor sends a signal, and the proportional relief valve (340) is unloaded, ensuring the safety of the test sample and equipment.

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