Large-flow hydraulic system

Abstract

The invention discloses a high-flow hydraulic system, which relates to the technical field of hydraulic test systems and comprises a hydraulic oil tank, a water cooling system, a high-pressure oil source pump group, a pressure control valve group, a high-pressure energy accumulator group and a converging valve group, the high-pressure energy accumulator set comprises a plurality of energy accumulator units, and each energy accumulator unit comprises a leather bag type energy accumulator. The output end of the leather bag type energy accumulator is communicated with the energy accumulator stop valve through a pipeline; the traditional flow limitation is broken through through the cooperative energy supply mechanism of the high-pressure energy accumulator set and the multiple pump sets, and under the steady-state working condition, the high-pressure oil source pump set maintains basic flow output; when the detection system triggers the large-flow requirement, the confluence valve group starts the electromagnetic valve group to achieve synchronous energy supply of the energy accumulator group and superposition of output of the pump group to form larger instantaneous flow, and the design enables the system to continuously execute short-time large-flow hydraulic pulse test and meet the large-flow hydraulic test requirement.

Description

Technical Field

[0001] The present invention relates to the technical field of hydraulic test systems, and specifically to a large-flow hydraulic system. Background Art

[0002] Traditional hydraulic test systems mostly adopt a direct energy supply mode with a single pump set. The maximum flow output is limited by the rated parameters of the pump set, making it difficult to meet the instantaneous large-flow requirements of test objects such as aviation actuators and heavy construction machinery. When the test system suddenly requests a flow rate, conventional accumulators cannot achieve rapid flow compensation due to their scattered layout and high response delay, resulting in a sudden drop in pressure and directly affecting the test accuracy. In existing systems, when there is a step change in flow rate, the pressure recovery time is long, making it difficult to meet the requirements for dynamic response speed in test standards. Summary of the Invention

[0003] The purpose of the present invention is to provide a large-flow hydraulic system to solve the problem that the existing hydraulic test systems in the above-mentioned background art are difficult to meet the instantaneous large-flow requirements.

[0004] To achieve the above purpose, the present invention provides the following technical solutions:

[0005] A large-flow hydraulic system includes a hydraulic oil tank, a water cooling system, a high-pressure oil source pump set, a pressure control valve group, a high-pressure accumulator group, and a confluence valve group;

[0006] The hydraulic oil tank is used to provide an oil source for the entire system. The oil outlet of the hydraulic oil tank is connected to the high-pressure oil source pump set and the confluence valve group in sequence through pipelines. A pressure control valve group for adjusting the oil pressure is provided on the pipeline between the confluence valve group and the high-pressure oil source pump set. The output end of the confluence valve group is connected to an external end test system through a pipeline;

[0007] The high-pressure accumulator group is connected to the confluence valve group through a pipeline and is used to compensate the high-pressure oil required for the flow rate when a large flow of oil is needed in the system for a short time, eliminate the pulsation of the high-pressure oil in the system, and make the oil supply stable;

[0008] The return port of the hydraulic oil tank is connected to the external end test system, and a water cooling system for cooling the oil is provided on the pipeline between the two.

[0009] As a further solution of the present invention: the high-pressure accumulator group includes a plurality of accumulator units, the accumulator units include bladder accumulators, an accumulator hoop is arranged in the middle of the bladder accumulator, and an accumulator rubber gasket is arranged between the accumulator hoop and the bladder accumulator; the output end of the bladder accumulator is communicated with an accumulator stop valve through a pipeline. Its advantage is that it can eliminate the pulsation of high-pressure oil in the system, make the oil supply stable, and at the same time, when a large flow of oil is required in the system for a short time, it can compensate for the high-pressure oil required for the flow.

[0010] As a further solution of the present invention: there are sixteen accumulator units, and the sixteen accumulator units are divided into four groups, each group includes four accumulator units, and the four accumulator units in the same group are all communicated with an accumulator safety valve through pipelines; the output ends of the four accumulator safety valves are combined through pipelines and sent into a confluence valve group.

[0011] As a further solution of the present invention: the high-pressure oil source pump group includes a piston pump, and the output port of the piston pump is sequentially connected with a high-pressure filter and a check valve through a pipeline. The check valve is arranged behind the high-pressure filter, and a differential pressure transmitter is installed on the high-pressure filter to detect the differential pressure on both sides of the high-pressure filter; its advantage is to prevent the reverse flow of hydraulic oil from impacting the piston pump; prevent the formation of a "hydraulic hammer" phenomenon by impacting the high-pressure filter.

[0012] As a further solution of the present invention: the hydraulic oil tank includes a tank body, an oil return filter, a circulating filtration motor and a temperature sensor are arranged on the top of the tank body, and a liquid level controller is fixedly installed at the end of the tank body; a drain ball valve is arranged at the bottom of the tank body; its advantage is that the hydraulic oil tank is configured with a low-pressure circulating pump group to fully circulate and mix the hydraulic oil in the tank to ensure the balance of the oil temperature; a heating function is provided in the hydraulic oil tank.

[0013] As a further solution of the present invention: the liquid level controller includes a liquid level sensor one and a liquid level sensor two, and the height of the liquid level sensor one is higher than that of the liquid level sensor two; when the liquid level sensor one detects the liquid level, it judges that the liquid level in the tank is low, sends a signal and gives an audible and visual alarm; when the liquid level sensor two detects the liquid level, it judges that the liquid level in the tank is too low, sends a signal and gives an audible and visual alarm, and the entire hydraulic system shuts down.

[0014] As a further solution of the present invention: The confluence valve group includes two confluence solenoid valves. One side of each of the two confluence solenoid valves is connected to a pressure - building throttle valve and a pressure - relief throttle valve through pipelines respectively. A cover plate solenoid valve and a confluence two - way cartridge valve are connected through a pipeline between the pressure - building throttle valve and the pressure - relief throttle valve. The confluence two - way cartridge valve is connected to an external end - of - line test system and is used to output hydraulic oil to it. Its advantage lies in that the confluence valve group integrates a fast pressure - building function. The confluent pressure oil passes through the energized solenoid valve, and the pressure - building throttle valve quickly builds pressure to the end - of - line test system. After the pressure is built, the opening and closing of the cover plate solenoid valve are controlled, and the oil in the accumulator and the system reaches the end system through the confluence two - way cartridge valve. At the same time, a pressure - relief throttle valve is also designed on the confluence solenoid valve, and the pressure - relief speed is adjusted by controlling the confluence solenoid valve. As a further solution of the present invention: The pressure control valve group includes a pressure control solenoid valve. One end of the pressure control solenoid valve is connected to a relief valve through a pipeline; the other end of the pressure control solenoid valve is connected to a pressure - controlled two - way cartridge valve through a pipeline.

[0015] As a further solution of the present invention: The water - cooling system includes a vane pump. An output end of the vane pump is fixedly installed with a relief valve and a circulating filter through pipelines. The circulating filter is connected to a bypass check valve, a radiator, and a water - cooling ball valve through a circulating pipeline. A chiller is arranged on one side of the circulating pipeline; when the system needs to be cooled, the vane pump pumps the hydraulic oil to the radiator, and the chiller accesses the external water source to cool the radiator in a circulating manner.

[0016] As a further solution of the present invention: The working method of this hydraulic system includes the following steps:

[0017] Step 1: Start by an AC motor, driving the hydraulic oil in the hydraulic oil tank to flow, so that it enters the high - pressure oil source pump group;

[0018] Step 2: Start the piston pump of the high - pressure oil source pump group, transport the hydraulic oil to the high - pressure filter for filtration. A part of the filtered hydraulic oil passes through the pressure control valve group and then enters the confluence valve group, and is sent out by the confluence valve group into the end system to be detected;

[0019] Step 3: Detect the pressure of the hydraulic oil output by the confluence valve group through a pressure gauge. When the hydraulic oil pressure drops, the high - pressure accumulator group replenishes the hydraulic oil to the confluence valve group through a pipeline to ensure a stable supply of hydraulic oil;

[0020] Step 4: The hydraulic oil used for detection in the end system to be detected is sent back to the hydraulic oil tank through a pipeline, and during the return process, it is cooled by the water - cooling system;

[0021] Step 5: Drive the hydraulic oil in the hydraulic oil tank through a circulating filter motor to be filtered by the return - oil filter and then sent back into the hydraulic oil tank to realize the filtration and cleaning of the hydraulic oil.

[0022] Compared with the prior art, the beneficial effects of the present invention are as follows: the present invention breaks through the traditional flow limitation by setting a high-pressure accumulator group on the basis of a conventional pump group hydraulic supply system, and utilizing the coordinated energy supply mechanism of the high-pressure accumulator group and multiple pump groups. Under steady-state conditions, the high-pressure oil source pump group maintains the basic flow output; when the detection system triggers a large flow demand, the converging valve group starts the solenoid valve group to realize the synchronous energy supply of the four-way accumulator group, and the superimposed pump group output forms a larger instantaneous flow. The converging two-way cartridge valve design can shorten the flow switching time, and cooperate with the step-by-step opening strategy of the pressure-building throttle valve to ensure small pressure fluctuations during the flow jump process; this design enables the system to continuously perform short-term large-flow hydraulic pulse tests to meet the large-flow hydraulic test requirements;

[0023] The high-pressure oil source pump group of the present invention sets a one-way valve after the high-pressure filter to prevent the hydraulic oil from flowing back and impacting the plunger pump; prevents the impact on the high-pressure filter to form a "hydraulic hammer" phenomenon; further, a pressure difference transmitter is arranged on the high-pressure filter, and when the filter element is blocked, the corresponding pressure difference transmitter sends a signal and an audible and visual alarm; and an oil suction butterfly valve and a limit switch are arranged at the oil suction port of the high-pressure plunger pump to detect the working state of the high-pressure plunger pump; to ensure the stable operation of the device;

[0024] The hydraulic oil tank of the present invention is provided with a heating function, which cooperates with the temperature detection of the pressure control valve group and the overflow valve to ensure the balanced stability of the oil temperature and the liquid level; and the oil temperature and the liquid level state of the entire oil tank are controlled and detected through the liquid level controller and the temperature sensor, thereby greatly improving the safety of the system during operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a structural block diagram of the hydraulic system of the present invention;

[0026] Figure 2 It is a schematic diagram of the layout positions of various components of the present invention;

[0027] Figure 3 It is a structural diagram of the hydraulic oil tank of the present invention;

[0028] Figure 4 It is a structural diagram of the high-pressure oil source pump group of the present invention;

[0029] Figure 5 It is a structural diagram of the pressure control valve group of the present invention;

[0030] Figure 6 It is a structural diagram of the high-pressure accumulator group of the present invention;

[0031] Figure 7 It is a structural diagram of the confluence valve group of the present invention;

[0032] Figure 8 It is a structural diagram of the water cooling system of the present invention.

[0033] In the figure: 1. Hydraulic oil tank; 101. Tank main body; 102. AC motor; 103. Liquid level controller; 1031. Liquid level sensor 1; 1032. Liquid level sensor 2; 104. Drain ball valve; 2. High-pressure oil source pump group; 201. Plunger pump; 202. High-pressure filter; 203. Check valve; 3. Pressure control valve group; 301. Pressure control solenoid valve; 302. Relief valve; 303. Pressure-controlled two-way cartridge valve; 4. High-pressure accumulator group; 401. Bladder accumulator; 402. Accumulator stop valve; 403. Accumulator safety valve; 5. Confluence valve group; 501. Confluence solenoid valve; 502. Pressure building throttle valve; 503. Pressure relief throttle valve; 504. Confluence two-way cartridge valve; 505. Cover plate solenoid valve; 6. Water cooling system; 601. Vane pump; 602. Circulation filter; 603. Radiator; 604. Water cooling ball valve; 605. Chiller unit. Detailed implementation manners

[0034] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0035] Please refer to Figure 1 and Figure 2 , a large-flow hydraulic system, including a hydraulic oil tank 1, a water cooling system 6, a high-pressure oil source pump group 2, a pressure control valve group 3, a high-pressure accumulator group 4, and a confluence valve group 5;

[0036] The hydraulic oil tank 1 is used to provide an oil source for the entire system. The oil outlet of the hydraulic oil tank 1 is connected to the high-pressure oil source pump group 2 and the confluence valve group 5 in sequence through pipelines; a pressure control valve group 3 for adjusting the oil pressure is arranged on the pipeline between the confluence valve group 5 and the high-pressure oil source pump group 2; the output end of the confluence valve group 5 is connected to an external end test system through a pipeline; the high-pressure accumulator group 4 is connected to the confluence valve group 5 through a pipeline and is used to compensate for the high-pressure oil required for the flow when a large flow of oil is needed in the system for a short time, eliminate the pulsation of the high-pressure oil in the system, and make the oil supply stable; the return port of the hydraulic oil tank 1 is connected to the external end test system, and a water cooling system 6 for cooling the oil is arranged on the pipeline between the two.

[0037] Please refer to Figure 6The high-pressure accumulator group 4 includes several accumulator units, and the accumulator unit includes a bladder accumulator 401. An accumulator clamp is arranged in the middle of the bladder accumulator 401, and an accumulator rubber gasket is arranged between the accumulator clamp and the bladder accumulator 401; the output end of the bladder accumulator 401 is connected with the accumulator stop valve 402 through a pipeline, and the pulsation suppression efficiency is improved by combining the bladder accumulator 401 with the rubber gasket buffer structure; the accumulator clamp design reduces vibration conduction, which is used to eliminate the pulsation of high-pressure oil in the system and ensure the smooth supply of oil. At the same time, when a large flow of oil is needed in the system for a short time, the accumulator group can quickly release the high-pressure oil to compensate for the required flow, so as to control the system pressure fluctuation; by setting the high-pressure accumulator group 4 in a cluster, the problems of large pressure fluctuation, slow response speed and low system reliability in the traditional hydraulic system in large flow test are successfully solved.

[0038] There are sixteen accumulator units, which are divided into four groups, each group includes four accumulator units, and the four accumulator units in the same group are connected to an accumulator safety valve 403 through pipelines; the output ends of the four accumulator safety valves 403 merge through pipelines and are sent to the merging valve group 5; this system breaks through the traditional flow limitation through the coordinated energy supply mechanism of the high-pressure accumulator group 4 and multiple pump groups. Under steady-state conditions, the high-pressure oil source pump group 2 maintains the basic flow output; when the detection system triggers a large flow demand, the merging valve group 5 starts the solenoid valve group to realize the synchronous energy supply of the four-way accumulator groups, and the superimposed pump group output forms a larger instantaneous flow. The design of the merging two-way cartridge valve 504 shortens the flow switching time, and cooperates with the step-by-step opening strategy of the pressure-building throttle valve 502 to ensure small pressure fluctuations during the flow jump process; this design enables the system to continuously perform short-term and large-flow hydraulic pulse tests to meet the needs of large-flow hydraulic tests.

[0039] See also Figure 4 The high-pressure oil source pump group 2 includes a plunger pump 201, and the output port of the plunger pump 201 is connected to a high-pressure filter 202 and a one-way valve 203 in sequence through a pipeline. The one-way valve 203 is arranged after the high-pressure filter 202, and a pressure difference transmitter is installed on the high-pressure filter 202 to detect the pressure difference on both sides of the high-pressure filter 202; thereby preventing the hydraulic oil from flowing back to impact the plunger pump 201; preventing the impact on the high-pressure filter 202 to form a "hydraulic hammer" phenomenon; the high-pressure filter 202 is equipped with a pressure difference transmitter, and when the filter element is blocked, the corresponding pressure difference transmitter sends a signal and an audible and visual alarm; the oil suction port of the high-pressure plunger pump 201 is equipped with an oil suction butterfly valve and a limit switch, and when the oil suction butterfly valve is in the normal working position, the corresponding limit switch sends a signal to prompt the operator to proceed to the next step; if no signal is sent, an audible and visual alarm is issued; the limit switch of the oil suction butterfly valve forms an electrical interlock with the plunger pump 201 to prevent dry-running damage.

[0040] See also Figure 3, the hydraulic oil tank 1 includes a tank body 101. At the top of the tank body 101, an oil return filter, a tank filter, a circulating filtration motor, and a temperature sensor are provided. At the end of the tank body 101, a liquid level controller 103 is fixedly installed; at the bottom of the tank body 101, an oil drain ball valve 104 is provided. The hydraulic oil tank 1 is configured with a low-pressure circulating pump group to fully circulate and mix the hydraulic oil in the tank to ensure the balance of the oil temperature; a heating function is provided inside the hydraulic oil tank 1 to cooperate with the temperature detection of the pressure control valve group 3.

[0041] The liquid level controller 103 includes a first liquid level sensor 1031 and a second liquid level sensor 1032. The height of the first liquid level sensor 1031 is higher than that of the second liquid level sensor 1032; when the first liquid level sensor 1031 detects the liquid level, it judges that the liquid level in the tank is low, sends a signal and gives an audible and visual alarm; when the second liquid level sensor 1032 detects the liquid level, it judges that the liquid level in the tank is too low, sends a signal and gives an audible and visual alarm, and the entire hydraulic system shuts down. The hydraulic oil tank 1 is configured with a temperature sensor and a temperature switch to participate in the control of the oil temperature in the entire tank. When the oil temperature in the tank < 10 °C, the overflow valve 302 is loaded and preheated to open; when the oil temperature in the tank > 30 °C, the overflow valve 302 stops working after preheating; when the oil temperature in the tank > 40 °C, the electrical control system sends a signal and gives an audible and visual alarm; when the oil temperature in the tank > 50 °C, the electrical control system sends a signal and gives an alarm, and the entire hydraulic station shuts down.

[0042] Please refer to Figure 7 , the confluence valve group 5 includes two confluence solenoid valves 501. On one side of the two confluence solenoid valves 501, a pressure building throttle valve 502 and a pressure relief throttle valve 503 are respectively connected through pipelines. Between the pressure building throttle valve 502 and the pressure relief throttle valve 503, a cover plate solenoid valve 505 and a confluence two-way cartridge valve 504 are connected through pipelines. The confluence two-way cartridge valve 504 is connected to an external end test system and is used to output oil to it; the confluence valve group 5 integrates a fast pressure building function. The confluent pressure oil passes through the energized solenoid valve, and the pressure building throttle valve 502 quickly builds pressure to the end test system. After the pressure is built, the cover plate solenoid valve 505 is controlled to switch, and the oil entering the confluence valve group 5 reaches the end system through the confluence two-way cartridge valve 504. At the same time, a pressure relief throttle valve 503 is also designed on the confluence solenoid valve 501, and the pressure relief speed is adjusted by controlling the confluence solenoid valve 501. The confluence valve group 5 integrates the composite control of the solenoid valve group and the cartridge valve to achieve flexible control of various pressure and flow states. The linkage between the pressure control solenoid valve 301 and the temperature sensor enables the system to work stably under different ambient temperatures; the pressure building throttle valve 502 and the pressure relief throttle valve 503 cooperate with each other to accurately control the system pressure relief time to meet the requirements of different test standards

[0043] Please refer to Figure 5The pressure control valve group 3 includes a pressure control solenoid valve 301 , one end of the pressure control solenoid valve 301 is connected to a relief valve 302 through a pipeline; the other end of the pressure control solenoid valve 301 is connected to a pressure-controlled two-way cartridge valve 303 through a pipeline.

[0044] See also Figure 8 The water cooling system 6 includes a vane pump 601, and the output end of the vane pump 601 is fixedly installed with an overflow valve 302 and a circulation filter 602 through a pipeline. The circulation filter 602 is connected to the bypass check valve 203, the radiator 603 and the water-cooled ball valve 604 through a circulation pipeline. A chiller 605 is arranged on one side of the circulation pipeline. When the system needs to be cooled, the vane pump 601 pumps the oil to the radiator 603, and the chiller 605 is connected to an external water source to cool the radiator 603. The chiller 605 of the water cooling system 6, in conjunction with the double circulation pipeline design of the radiator 603 and the bypass check valve 203, improves the oil temperature control accuracy. When the oil temperature is high, the radiator 603 runs at full power; under low temperature conditions, the pressure control valve group 3 can automatically enable electric heating, and cooperate with the heating function of the hydraulic oil tank 1 to reduce the oil temperature difference. The presence of the high-pressure filter 202 and the return oil filter can keep the oil standard and extend the service life of the entire system and each component.

[0045] When the present invention is in use, hydraulic oil is stored in the hydraulic oil tank 1 and each bladder accumulator 401, the oil inlet end of the external terminal system to be detected is connected to the output port of the converging valve group 5, and its oil outlet end is connected to the hydraulic oil tank 1; the AC motor 102 is started to drive the hydraulic oil in the hydraulic oil tank 1 to flow and enter the high-pressure oil source pump group 2;

[0046] The plunger pump 201 of the high-pressure oil source pump group 2 is started to transport the oil to the high-pressure filter 202 for filtration. The filtered oil passes through the pressure control valve group 3 and then enters the merging valve group 5, and is sent by the merging valve group 5 to the terminal system to be tested; the oil pressure output by the merging valve group 5 is tested by a pressure gauge. When the oil pressure drops, the high-pressure accumulator group 4 replenishes oil to the merging valve group 5 through the pipeline to ensure a stable supply of oil; the oil used for the test in the terminal system to be tested is returned to the hydraulic oil tank 1 through the pipeline, and is cooled by the water cooling system 6 during the return process; the oil in the hydraulic oil tank 1 is driven by the circulating filter motor to pass through the oil tank filter and the return oil filter in turn and then returned to the hydraulic oil tank 1 to achieve filtration and cleaning of the oil.

[0047] The above are only the preferred embodiments of the present invention, and do not impose any form of limitation on the present invention. Although the present invention has been disclosed above with the preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make some changes or modifications to equivalent embodiments by using the disclosed technical content within the scope of the technical solution of the present invention. However, as long as it does not depart from the content of the technical solution of the present invention, any simple modification, equivalent change and modification made to the above embodiments according to the technical essence of the present invention still fall within the scope of the technical solution of the present invention.

Claims

1. A large flow hydraulic system, characterized in that: It comprises a hydraulic oil tank (1), a water cooling system (6), a high-pressure oil source pump group (2), a pressure control valve group (3), a high-pressure accumulator group (4), and a converging valve group (5); A hydraulic oil tank (1) is used to provide an oil source for the entire system, and an oil outlet of the hydraulic oil tank (1) is connected to a high-pressure oil source pump group (2) and a merging valve group (5) in sequence through a pipeline; a pressure control valve group (3) for adjusting the oil pressure is provided on the pipeline between the merging valve group (5) and the high-pressure oil source pump group (2); an output end of the merging valve group (5) is connected to an external terminal test system through a pipeline; The high-pressure accumulator group (4) is connected to the converging valve group (5) through a pipeline, and is used to compensate for the required flow of high-pressure oil when a large flow of oil is needed in the system for a short time, eliminate the pulsation of the high-pressure oil in the system, and ensure a stable oil supply; The return port of the hydraulic oil tank (1) is in communication with an external terminal test system, and a water cooling system (6) for cooling the oil is provided on the pipeline between the two.

2. A high flow hydraulic system according to claim 1, characterized in that: The high-pressure accumulator group (4) comprises a plurality of accumulator units, wherein the accumulator unit comprises a bladder accumulator (401), an accumulator clamp is arranged in the middle of the bladder accumulator (401), and an accumulator rubber gasket is arranged between the accumulator clamp and the bladder accumulator (401); the output end of the bladder accumulator (401) is connected to the accumulator stop valve (402) through a pipeline.

3. A large flow hydraulic system according to claim 1, characterized in that: Sixteen accumulator units are provided, and the sixteen accumulator units are divided into four groups, each group includes four accumulator units, and the four accumulator units in the same group are connected to an accumulator safety valve (403) through a pipeline; the output ends of the four accumulator safety valves (403) are combined through a pipeline and sent to a combining valve group (5).

4. A high flow hydraulic system according to claim 1, characterized in that: The high-pressure oil source pump group (2) comprises a plunger pump (201), the output port of the plunger pump (201) being connected to a high-pressure filter (202) and a one-way valve (203) in sequence through a pipeline, the one-way valve (203) being arranged behind the high-pressure filter (202), and a pressure differential transmitter being installed on the high-pressure filter (202) for detecting the pressure differential on both sides of the high-pressure filter (202).

5. A large flow hydraulic system according to claim 1, characterized in that: The hydraulic oil tank (1) comprises an oil tank body (101), the top of which is provided with an oil return filter, a circulating filter motor and a temperature sensor, and the end of the oil tank body (101) is fixedly mounted with a liquid level controller (103); and the bottom of the oil tank body (101) is provided with an oil drain ball valve (104).

6. A large flow hydraulic system according to claim 1, characterized in that: The liquid level controller (103) comprises a liquid level sensor 1 (1031) and a liquid level sensor 2 (1032), wherein the height of the liquid level sensor 1 (1031) is higher than the height of the liquid level sensor 2 (1032); when the liquid level sensor 1 (1031) detects the liquid level, it determines that the liquid level in the oil tank is low, sends a signal and generates an audible and visual alarm; when the liquid level sensor 2 (1032) detects the liquid level, it determines that the liquid level in the oil tank is too low, sends a signal and generates an audible and visual alarm, and the entire hydraulic system shuts down.

7. A large flow hydraulic system according to claim 1, characterized in that: The merging valve group (5) comprises two merging solenoid valves (501), one side of the two merging solenoid valves (501) is connected to a pressure-building throttle valve (502) and a pressure-releasing throttle valve (503) via pipelines, a cover plate solenoid valve (505) and a merging two-way cartridge valve (504) are connected between the pressure-building throttle valve (502) and the pressure-releasing throttle valve (503) via pipelines, and the merging two-way cartridge valve (504) is connected to an external terminal test system for outputting oil thereto.

8. A large flow hydraulic system according to claim 1, characterized in that: The pressure control valve group (3) comprises a pressure control solenoid valve (301), one end of which is connected to a relief valve (302) via a pipeline; the other end of which is connected to a pressure-controlled two-way cartridge valve (303) via a pipeline.

9. A large flow hydraulic system according to claim 1, characterized in that: The water cooling system (6) comprises a vane pump (601), an output end of the vane pump (601) being fixedly provided with an overflow valve (302) and a circulation filter (602) via a pipeline, the circulation filter (602) being connected to a bypass check valve (203), a radiator (603) and a water cooling ball valve (604) via a circulation pipeline, and a chiller (605) being provided on one side of the circulation pipeline.

10. A large flow hydraulic system according to claim 1, characterized in that: The working method of the hydraulic system includes the following steps: Step 1: The AC motor (102) is started to drive the hydraulic oil in the hydraulic oil tank (1) to flow into the high-pressure oil source pump group (2); Step 2: The plunger pump (201) of the high-pressure oil source pump group (2) is started to deliver the oil to the high-pressure filter (202) for filtration. The filtered oil passes through the pressure control valve group (3) and then enters the merging valve group (5), and is delivered by the merging valve group (5) to the terminal system to be tested. Step 3: Use a pressure gauge to detect the oil pressure output by the merging valve group (5). When the oil pressure drops, the high-pressure accumulator group (4) replenishes oil to the merging valve group (5) through a pipeline to ensure a stable supply of oil. Step 4: The oil used for the test in the terminal system to be tested is returned to the hydraulic oil tank (1) via a pipeline, and is cooled by a water cooling system (6) during the return process; Step 5: The oil in the hydraulic oil tank (1) is driven by the circulating filter motor to be filtered through the return oil filter and then sent back to the hydraulic oil tank (1), thereby achieving filtering and cleaning of the oil.

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