Flushing tool and method for high-flow pipeline of hydraulic servo system

Abstract

The invention relates to a hydraulic servo system large-flow pipeline flushing tool and method. The invention relates to the technical field of hydraulic design and transmission. The tool comprises an electromagnetic reversing valve, an oil return port SAE flange cover, a flushing block, an oil return port M16, an oil supply port G1, an oil return port M27, an oil supply port SAE flange cover, an oil return port M14 and an oil return port M22. According to the invention, a set of pipeline flushing tool is designed, a key part flushing requirement standard is given, and finally, an automatic timing flushing function is completed through electrical control and acquisition.

Description

Technical Field

[0001] The invention relates to the technical field of hydraulic design and transmission, and relates to a large-flow pipeline flushing tool and method for a hydraulic servo system. Background Art

[0002] In the actual application of hydraulic servo systems, hydraulic oil contamination problems often occur. Before the hydraulic pipeline is used, pollutants in the manufacturing and assembly process are easy to enter the system. If not handled, the hydraulic oil will deteriorate, which will lead to various faults in the installed hydraulic system and malfunction. Especially in hydraulic proportional and servo control systems with high precision requirements, hydraulic oil contamination control and corresponding pipeline flushing are extremely important.

[0003] The conventional method is to flush the hydraulic transmission system by manually replacing pipes, replacing joints and manually timing according to technical requirements.

[0004] The conventional flushing method has a cumbersome process, serious oil leakage, low efficiency, and no clear flushing technical requirements and standards are given for key components such as accumulators. Summary of the invention

[0005] In view of the shortcomings of the prior art, the present invention provides a hydraulic servo system large-flow pipeline flushing tool and method. The present invention mainly designs a set of pipeline flushing tooling, and provides the flushing requirements and standards for key components, and finally completes the automatic timing flushing function through electrical control and collection.

[0006] The present invention provides the following technical solutions:

[0007] A hydraulic servo system large flow pipeline flushing tool, the tool comprising: a solenoid reversing valve, an oil return port SAE flange cover, a flushing block, an oil return port M16, an oil supply port G1, an oil return port M27, an oil supply port SAE flange cover, an oil return port M14 and an oil return port M22;

[0008] The solenoid reversing valve is installed on the oil return port SAE flange cover, the flushing block is connected to the oil return port SAE flange cover, and the flushing block side is installed with the oil return port M16, oil supply port G1, oil return port M27, oil supply port SAE flange cover, oil return port M14 and oil return port M22.

[0009] Preferably, when the electromagnetic reversing valve is energized, the electromagnetic valve works in the left position, and for the oil supply port, it is not connected to the oil return port, and it is a pressure charging process.

[0010] Preferably, when the oil supply pressure reaches the required flushing pressure, the electromagnetic reversing valve is powered off and the electromagnetic valve works in the right position.

[0011] A method for flushing a large-flow pipeline of a hydraulic servo system, the method is based on a large-flow pipeline flushing tool for a hydraulic servo system, and the method comprises the following steps:

[0012] Step 1: Connect the pipelines between the hydraulic source and the test bench, including the oil supply accumulator assembly and the oil return accumulator assembly, according to the drawings, remove the servo valves at each actuator, remove the oil supply hose, oil return hose, oil drain hose, pilot oil supply hose, etc. on the actuator, seal the oil ports on the actuator, and connect the hoses to the flushing fixture;

[0013] Step 2: Determine the flow rate, start the specified number of pumps, perform low-pressure, high-flow circulation filtration, and determine whether there is oil leakage. If oil leakage is found, stop the pump immediately and eliminate the oil leakage problem;

[0014] Step 3: After flushing for 4 hours, check the contamination level of the hydraulic oil inside the pipeline. If it does not meet the requirements, continue the cycle and check the contamination level every 1 hour until the requirements are met.

[0015] Preferably, the hydraulic oil in the pipeline should be in a turbulent state during on-site flushing, and the flow rate in the hose should not be too fast to prevent damage to the hose. That is, the parameters of the hydraulic oil in the pipeline should meet the following two requirements:

[0016] Hose pipeline flow velocity v≤50m / s;

[0017] Pipeline Reynolds number Re ≥ 4000;

[0018] The calculation formula is as follows:

[0019]

[0020] Where Q is the flow rate in the pipe, d is the inner diameter of the pipe, and ν oil is the hydraulic oil viscosity;

[0021] According to the minimum Reynolds number requirement and the maximum flow rate limit, the minimum and maximum flow rate values ​​of a certain pipe diameter can be obtained by equations (1) and (2).

[0022] Preferably,

[0023] Before flushing, the accumulator needs to be inflated in the initial state. Depending on the type of accumulator, the inflation pressure is as follows:

[0024] Bladder accumulator: The high-pressure accumulator has an air filling pressure of 2MPa and an oil filling pressure of 7MPa. When the accumulator has a pre-charged nitrogen pressure of 4MPa-5MPa, the nitrogen pressure will not be reduced and the oil filling pressure is set to 3.5 times the nitrogen pressure. The low-pressure accumulator has an air filling pressure of 1MPa and an oil filling pressure of 3.5MPa.

[0025] Diaphragm accumulator: The filling pressure of high-pressure accumulator is 2MPa, the filling pressure of low-pressure accumulator is 1MPa, and the filling pressure is high, but not higher than the allowable compression ratio;

[0026] Piston accumulator: The accumulator filling pressure is 1MPa, and the oil filling pressure is high, but not higher than the rated working pressure.

[0027] Preferably, the corresponding pipeline is connected, and then the tooling electromagnetic reversing valve is energized and starts to charge oil. After 2 to 5 seconds, the tooling electromagnetic reversing valve is de-energized and starts to discharge oil. The specific time is determined by the capacity of the accumulator.

[0028] After 20 flushing cycles, the contamination level of the oil in the accumulator is tested during the oil discharge process. If it does not meet the NAS16385 level requirement, continue flushing for 20 cycles and test the contamination level again until the contamination level meets the requirement.

[0029] Preferably, during the entire flushing process, the temperature of the oil source temperature sensor is collected by a computer board to control the oil temperature within the range of 40°C to 60°C. When the temperature is too high, the system automatically shuts down.

[0030] A computer-readable storage medium stores a computer program, which is executed by a processor to implement a large-flow pipeline flushing method for a hydraulic servo system.

[0031] A computer device comprises a memory and a processor, wherein the memory stores a computer program and the processor implements a method for flushing a large-flow pipeline of a hydraulic servo system when executing the computer program.

[0032] The present invention has the following beneficial effects:

[0033] Compared with the prior art, the present invention has the following advantages:

[0034] The present invention designs a set of pipeline flushing tooling, provides flushing requirements and standards for key components, and finally completes the automatic timing flushing function through electrical control and data collection. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0036] Figure 1 Shown is a schematic diagram of the external structure of the flushing tool of the present invention;

[0037] Figure 2Shown is the hydraulic principle diagram of the flushing tooling of the present invention.

[0038] Figure 3 Shown is a pipeline flushing flow chart of the present invention;

[0039] Figure 4 Shown is the accumulator flushing flow chart of the present invention;

[0040] Figure 5 Shown is the electrical principle diagram of the controlled electromagnetic reversing valve of the present invention;

[0041] Figure 6 Shown is the electrical schematic diagram of the pressure and temperature sensor acquisition of the present invention. DETAILED DESCRIPTION

[0042] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0043] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0044] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0045] In addition, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0046] The present invention is described in detail below in conjunction with specific embodiments. Specific embodiment one:

[0048] according to Figures 1 to 6 As shown, the specific optimization technical solution adopted by the present invention to solve the above technical problems is: the present invention relates to a large-flow pipeline flushing tool and method for a hydraulic servo system.

[0049] The present invention provides a large flow pipeline flushing tool for a hydraulic servo system, the tool comprising: 1-a solenoid reversing valve, 2-an oil return port SAE flange cover, 3-a flushing block, 4-an oil return port M16, 5-an oil supply port G1, 6-an oil return port M27, 7-an oil supply port SAE flange cover, 8-an oil return port M14 and 9-an oil return port M22;

[0050] The solenoid reversing valve is installed on the oil return port SAE flange cover, the flushing block is connected to the oil return port SAE flange cover, and the flushing block side is installed with the oil return port M16, oil supply port G1, oil return port M27, oil supply port SAE flange cover, oil return port M14 and oil return port M22. Specific embodiment 2:

[0052] The difference between the second embodiment of the present application and the first embodiment is that:

[0053] When the solenoid reversing valve is energized, the solenoid valve works in the left position. For the oil supply port, it is not connected to the oil return port, and it is a pressurization process. Specific embodiment three:

[0055] The difference between the third embodiment of the present application and the second embodiment is that:

[0056] When the oil supply pressure reaches the required flushing pressure, the solenoid reversing valve is de-energized and the solenoid valve works in the right position. Specific embodiment four:

[0058] The difference between the fourth embodiment of the present application and the third embodiment is that:

[0059] The present invention provides a method for flushing a large-flow pipeline of a hydraulic servo system. The method is based on a large-flow pipeline flushing tool for a hydraulic servo system, and the method comprises the following steps:

[0060] Step 1: Connect the pipelines between the hydraulic source and the test bench, including the oil supply accumulator assembly and the oil return accumulator assembly, according to the drawings, remove the servo valves at each actuator, remove the oil supply hose, oil return hose, oil drain hose, pilot oil supply hose, etc. on the actuator, seal the oil ports on the actuator, and connect the hoses to the flushing fixture;

[0061] Step 2: Determine the flow rate, start the specified number of pumps, perform low-pressure, high-flow circulation filtration, and determine whether there is oil leakage. If oil leakage is found, stop the pump immediately and eliminate the oil leakage problem;

[0062] Step 3: After flushing for 4 hours, check the contamination level of the hydraulic oil inside the pipeline. If it does not meet the requirements, continue the cycle and check the contamination level every 1 hour until the requirements are met. Specific embodiment five:

[0064] The difference between the fifth embodiment of the present invention and the fourth embodiment is that:

[0065] During on-site flushing, the hydraulic oil in the pipeline should be in a turbulent state, and the flow rate in the hose should not be too fast to prevent the hose from being damaged. That is, the parameters of the hydraulic oil in the pipeline should meet the following two requirements:

[0066] Hose pipeline flow velocity v≤50m / s;

[0067] Pipeline Reynolds number Re ≥ 4000;

[0068] The calculation formula is as follows:

[0069]

[0070] Where Q is the flow rate in the pipe, d is the inner diameter of the pipe, and ν oil is the hydraulic oil viscosity;

[0071] According to the minimum Reynolds number requirement and the maximum flow rate limit, the minimum and maximum flow rate values ​​of a certain pipe diameter can be obtained by equations (1) and (2). Specific embodiment six:

[0073] The difference between the sixth embodiment of the present invention and the fifth embodiment is that:

[0074] Before flushing, the accumulator needs to be inflated in the initial state. Depending on the type of accumulator, the inflation pressure is as follows:

[0075] Bladder accumulator: The high-pressure accumulator has an air filling pressure of 2MPa and an oil filling pressure of 7MPa. When the accumulator has a pre-charged nitrogen pressure of 4MPa-5MPa, the nitrogen pressure will not be reduced and the oil filling pressure is set to 3.5 times the nitrogen pressure. The low-pressure accumulator has an air filling pressure of 1MPa and an oil filling pressure of 3.5MPa.

[0076] Diaphragm accumulator: The filling pressure of high-pressure accumulator is 2MPa, the filling pressure of low-pressure accumulator is 1MPa, and the filling pressure is high, but not higher than the allowable compression ratio;

[0077] Piston accumulator: The accumulator filling pressure is 1MPa, and the oil filling pressure is high, but not higher than the rated working pressure. Specific embodiment seven:

[0079] The difference between the seventh embodiment of the present invention and the sixth embodiment is that:

[0080] Connect the corresponding pipeline, then the tooling electromagnetic reversing valve is energized and starts to charge oil. After 2 to 5 seconds, the tooling electromagnetic reversing valve is de-energized and starts to discharge oil. The specific time is determined by the capacity of the accumulator.

[0081] After 20 flushing cycles, the contamination level of the oil in the accumulator is tested during the oil discharge process. If it does not meet the NAS16385 level requirement, continue flushing for 20 cycles and test the contamination level again until the contamination level meets the requirement. Specific embodiment eight:

[0083] The difference between the eighth embodiment of the present invention and the seventh embodiment is that:

[0084] During the entire flushing process, the temperature of the oil source temperature sensor is collected through the computer board to control the oil temperature within the range of 40℃ ~ 60℃. When the temperature is too high, the system automatically shuts down. Specific embodiment nine:

[0086] The difference between the ninth embodiment of the present invention and the eighth embodiment is that:

[0087] The present invention provides a computer-readable storage medium on which a computer program is stored. The program is executed by a processor to implement a large-flow pipeline flushing method for a hydraulic servo system. Specific embodiment ten:

[0089] The difference between the tenth embodiment of the present invention and the ninth embodiment is that:

[0090] The present invention provides a computer device, comprising a memory and a processor, wherein the memory stores a computer program, and the processor implements a method for flushing a large-flow pipeline of a hydraulic servo system when executing the computer program. Specific embodiment eleven:

[0092] The difference between the eleventh embodiment of the present invention and the tenth embodiment is that:

[0093] like Figure 1 As shown, 1 is the solenoid reversing valve, 2 is the SAE flange cover, which is the oil return port, 3 is the flushing block, 4 is the oil return port M16, 5 is the oil supply port G1, 6 is the oil return port M27, 7 is the SAE flange cover, which is the oil supply port, 8 is the oil return port M14, and 9 is the oil return port M22. The flushing tool is composed of several oil supply ports and oil return ports on the flushing block 3. Different oil supply ports or oil return ports are suitable for different flushing pipeline interface sizes. For example, port 2 is larger and is a low-pressure oil return port, and port 7 is smaller and is a high-pressure oil supply port.

[0094] Schematic diagram Figure 2As shown, port P mainly corresponds to the oil supply port, and port T corresponds to the oil return port. Ports A and B are implemented inside the tooling. It can be seen that when the solenoid reversing valve 1 is energized, the solenoid valve works in the left position. For the oil supply port, it is not connected to the oil return port, and it is a pressurization process. When the oil supply pressure reaches the required flushing pressure, the solenoid reversing valve 1 is de-energized, and the solenoid valve works in the right position. At this time, the oil that meets the flushing pressure reaches port A from port P and starts flushing.

[0095] Hydraulic oil parameter requirements

[0096] During on-site flushing, the hydraulic oil in the pipeline should be in a turbulent state, and the flow rate in the hose should not be too fast to prevent the hose from being damaged. That is, the parameters of the hydraulic oil in the pipeline should meet the following two requirements:

[0097] Hose pipeline flow velocity v≤50m / s;

[0098] The pipeline Reynolds number Re≥4000.

[0099] The calculation formula is as follows:

[0100]

[0101] Where:

[0102] Q——Flow rate in the pipeline (L / min);

[0103] d——inner diameter of the pipe (mm);

[0104] ν oil ——Hydraulic oil viscosity (mm 2 / s)

[0105] According to the minimum Reynolds number requirement and the maximum flow rate limit, the minimum and maximum flow rate values ​​of a certain pipe diameter can be obtained by formulas (1) and (2). For example, if the flushing pipe is DN10, the minimum flow rate at 40 degrees is 60.32L / min and the maximum flow rate is 235.62L / min.

[0106] Pipeline Flushing Process

[0107] like Figure 3 As shown, the following preparations need to be made in the initial state before flushing: Connect the pipelines between the hydraulic source and the test bench, including the oil supply accumulator assembly and the oil return accumulator assembly, according to the drawings. Remove the servo valves at each actuator. Remove the oil supply hose, oil return hose, oil drain hose, pilot oil supply hose, etc. on the actuator, seal the oil ports on the actuator, and connect the hoses to the flushing fixture.

[0108] According to the flow rate determined by formulas (1) and (2), start the specified number of pumps to perform low-pressure, high-flow circulation filtration and observe whether there is oil leakage. If oil leakage is found, stop the pump immediately and eliminate the oil leakage problem. After flushing for 4 hours, check the contamination of the hydraulic oil inside the pipeline. If it does not meet the requirements, continue to circulate and check the contamination every 1 hour until it meets the requirements. Note that each time the contamination is tested, the oil in the cecum area at the test point must be released first, that is, the oil must be released for 2 seconds before sampling.

[0109] Accumulator Flushing Process

[0110] like Figure 4 As shown, the accumulator needs to be charged in the initial state before flushing. Depending on the type of accumulator, the charging pressure is as follows:

[0111] 1) Bladder accumulator: The high-pressure accumulator has an air filling pressure of 2MPa and an oil filling pressure of 7MPa. If the accumulator has been pre-charged with nitrogen at a pressure of 4MPa to 5MPa, the nitrogen pressure does not need to be reduced and the oil filling pressure is set to 3.5 times the nitrogen pressure. The low-pressure accumulator has an air filling pressure of 1MPa and an oil filling pressure of 3.5MPa.

[0112] 2) Diaphragm accumulator: The filling pressure of high-pressure accumulator is 2MPa, the filling pressure of low-pressure accumulator is 1MPa, and the filling pressure is as high as possible, but not higher than the allowable compression ratio.

[0113] 3) Piston accumulator: The accumulator filling pressure is 1MPa, and the oil filling pressure is as high as possible, but not higher than the rated working pressure.

[0114] Connect the corresponding pipeline, then the tooling electromagnetic reversing valve 1 is powered on and starts to fill with oil. After 2 to 5 seconds, the tooling electromagnetic reversing valve 1 is powered off and starts to drain the oil. The specific time is determined by the capacity of the accumulator. After 20 cycles of flushing, the contamination degree of the oil in the accumulator is tested during the oil draining process. If it does not meet the requirements of NAS16385, continue flushing for 20 cycles and then test the contamination degree until the contamination degree meets the requirements.

[0115] During the whole flushing process, the temperature of the oil source temperature sensor is collected through the computer board to control the oil temperature within the range of 40℃~60℃. If the temperature is too high, the system will automatically shut down.

[0116] Electrical part:

[0117] Figure 5 The electrical schematic diagram of the electromagnetic reversing valve is given. The electromagnetic reversing valve 1 is controlled by the computer IO control board through the P1 port of the conditioning board DG3. Its power supply 24V is provided by pin 2 in the corresponding port, and the control signal is controlled by pin 1 in the corresponding port.

[0118] Figure 6 The electrical schematic diagram of the pressure sensor and temperature sensor is given. The pressure sensor for collecting pressure is transmitted by the computer simulation acquisition board LC2-1 through the P1 port of the analog conditioning board AG2, its power supply 24V is provided by pin 3 in the port, and the pressure signal is collected by pin 6 in the port. The temperature sensor for collecting temperature is transmitted by the computer simulation acquisition board LC2-1 through the P2 port of the analog conditioning board AG2, its power supply 24V is provided by pin 3 in the port, and the pressure signal is collected by pin 6 in the port.

[0119] The above is only a preferred implementation of a hydraulic servo system large flow pipeline flushing tool and method. The protection scope of a hydraulic servo system large flow pipeline flushing tool and method is not limited to the above embodiment. All technical solutions under this idea belong to the protection scope of the present invention. It should be pointed out that for those skilled in the art, several improvements and changes without departing from the principle of the present invention should also be regarded as the protection scope of the present invention.

Claims

1. A hydraulic servo system large flow pipeline flushing tool, characterized by: The tooling includes: a solenoid reversing valve, an oil return port SAE flange cover, a flushing block, an oil return port M16, an oil supply port G1, an oil return port M27, an oil supply port SAE flange cover, an oil return port M14 and an oil return port M22; The solenoid reversing valve is installed on the oil return port SAE flange cover, the flushing block is connected to the oil return port SAE flange cover, and the flushing block side is installed with the oil return port M16, oil supply port G1, oil return port M27, oil supply port SAE flange cover, oil return port M14 and oil return port M22.

2. The tooling according to claim 1, characterized in that: When the solenoid reversing valve is energized, the solenoid valve works in the left position. For the oil supply port, it is not connected to the oil return port, and it is a pressurization process.

3. The tooling according to claim 2, characterized in that: When the oil supply pressure reaches the required flushing pressure, the solenoid reversing valve is de-energized and the solenoid valve works in the right position.

4. A method for flushing a large flow pipeline of a hydraulic servo system, the method being based on the tooling of claim 1, characterized in that: The method comprises the following steps: Step 1: Connect the pipelines between the hydraulic source and the test bench, including the oil supply accumulator assembly and the oil return accumulator assembly, according to the drawings, remove the servo valves at each actuator, remove the oil supply hose, oil return hose, oil drain hose, pilot oil supply hose, etc. on the actuator, seal the oil ports on the actuator, and connect the hoses to the flushing fixture; Step 2: Determine the flow rate, start the specified number of pumps, perform low-pressure, high-flow circulation filtration, and determine whether there is oil leakage. If oil leakage is found, stop the pump immediately and eliminate the oil leakage problem; Step 3: After flushing for 4 hours, check the contamination level of the hydraulic oil inside the pipeline. If it does not meet the requirements, continue the cycle and check the contamination level every 1 hour until the requirements are met.

5. The method according to claim 4, characterized in that: During on-site flushing, the hydraulic oil in the pipeline should be in a turbulent state, and the flow rate in the hose should not be too fast to prevent the hose from being damaged. That is, the parameters of the hydraulic oil in the pipeline should meet the following two requirements: Hose pipeline flow velocity v≤50m / s; Pipeline Reynolds number Re ≥ 4000; The calculation formula is as follows: Where Q is the flow rate in the pipe, d is the inner diameter of the pipe, and ν oil is the hydraulic oil viscosity; According to the minimum Reynolds number requirement and the maximum flow rate limit, the minimum and maximum flow rate values ​​of a certain pipe diameter can be obtained by equations (1) and (2).

6. The method according to claim 5, characterized in that: Before flushing, the accumulator needs to be inflated in the initial state. Depending on the type of accumulator, the inflation pressure is as follows: Bladder accumulator: The high-pressure accumulator has an air filling pressure of 2MPa and an oil filling pressure of 7MPa. When the accumulator has a pre-charged nitrogen pressure of 4MPa-5MPa, the nitrogen pressure will not be reduced and the oil filling pressure is set to 3.5 times the nitrogen pressure. The low-pressure accumulator has an air filling pressure of 1MPa and an oil filling pressure of 3.5MPa. Diaphragm accumulator: The filling pressure of high-pressure accumulator is 2MPa, the filling pressure of low-pressure accumulator is 1MPa, and the filling pressure is high, but not higher than the allowable compression ratio; Piston accumulator: The accumulator filling pressure is 1MPa, and the oil filling pressure is high, but not higher than the rated working pressure.

7. The method according to claim 6, characterized in that: Connect the corresponding pipeline, then the tooling electromagnetic reversing valve is energized and starts to charge oil. After 2 to 5 seconds, the tooling electromagnetic reversing valve is de-energized and starts to discharge oil. The specific time is determined by the capacity of the accumulator. After 20 flushing cycles, the contamination level of the oil in the accumulator is tested during the oil discharge process. If it does not meet the NAS16385 level requirement, continue flushing for 20 cycles and test the contamination level again until the contamination level meets the requirement.

8. The method according to claim 7, characterized in that: During the entire flushing process, the temperature of the oil source temperature sensor is collected through the computer board to control the oil temperature within the range of 40℃ ~ 60℃. When the temperature is too high, the system automatically shuts down.

9. A computer-readable storage medium having a computer program stored thereon, characterized in that: The program is executed by a processor to implement the method according to claims 4 to 8.

10. A computer device comprising a memory and a processor, wherein the memory stores a computer program, wherein: When the processor executes the computer program, the method of claims 4-8 is implemented.

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