Cleaning device and method for hydraulic system of oil transfer arm

Abstract

The invention belongs to the technical field of oil transfer arm cleaning, and discloses a cleaning device and method for an oil transfer arm hydraulic system, the cleaning device comprises three oil transfer arms, a hydraulic master station, three hydraulic substations, cleaning and filtering equipment, an oil tank and a dirt collecting tank, the three oil transfer arms are connected with the three hydraulic substations respectively, and the cleaning and filtering equipment is connected with the cleaning and filtering equipment. Oil cylinders are arranged on the three oil transfer arms, ERC oil ways are arranged between the three hydraulic substations and the hydraulic master station, an oil inlet way and an oil return way are located between the oil tank and the dirt collecting tank, and the oil tank is communicated with the hydraulic master station and the cleaning and filtering device. According to the cleaning device and method for the hydraulic system of the oil transfer arm, through multi-stage filtering and oil-water separation, the cleaning device can effectively remove tiny metal chippings, particulate matter and water in the hydraulic system, abrasion of impurities to moving parts is reduced, and therefore the service life of the oil transfer arm is prolonged, and the maintenance frequency and the maintenance cost are reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of oil transfer arm cleaning, and in particular to a cleaning device and method for an oil transfer arm hydraulic system. Background Art

[0002] The oil transfer arm of the petrochemical terminal is an important equipment that has been in continuous operation for a long time. Its hydraulic system has been under high-load operation for many years, and the mechanical parts have been worn to varying degrees. At the same time, due to the complex operating environment, external impurities are easy to enter the hydraulic system. The existing maintenance method is mainly to replace the hydraulic oil regularly, but this method cannot completely remove the solid impurities and moisture inside the system, resulting in frequent equipment failures, especially the solenoid valve core is often stuck due to impurities, affecting normal operation. Therefore, in order to ensure the continuous and stable operation of the oil transfer arm, it is necessary to introduce special cleaning equipment to thoroughly clean the hydraulic pipeline, remove all impurities, and restore the optimal performance of the system; The oil loading arm of the petrochemical terminal has been in use for nearly 20 years. Due to the wear of moving parts and the intrusion of external impurities, there are many impurities in the hydraulic system, such as tiny metal debris, particulate matter and water. These impurities have caused the solenoid valve core to jam many times, and the equipment cannot work normally. Conventional replacement of hydraulic oil cannot completely remove the impurities in the system. Therefore, special external equipment is required to clean the hydraulic pipeline to ensure the normal use of the oil loading arm. Therefore, we propose a cleaning device and method for the hydraulic system of the oil loading arm. Summary of the invention

[0003] The main purpose of the present invention is to provide a cleaning device and method for a hydraulic system of an oil delivery arm, which can effectively solve the problems in the background technology.

[0004] To achieve the above object, the technical solution adopted by the present invention is: A cleaning device for an oil delivery arm hydraulic system comprises an oil delivery arm, a hydraulic main station, a hydraulic substation, a cleaning and filtering device, an oil tank and a dirt collecting box. The oil delivery arms and the hydraulic substations are each provided with three, and the three oil delivery arms are respectively connected to the three hydraulic substations. The three oil delivery arms are each provided with an oil cylinder. An ERC oil circuit is provided between the three hydraulic substations and the hydraulic main station, and an inlet oil circuit and a return oil circuit are located between the oil tank and the dirt collecting box. The oil tank is interconnected with the hydraulic main station and the cleaning and filtering device, and an overflow valve is provided between the oil tank and the hydraulic main station and the cleaning and filtering device. The cleaning and filtering device is interconnected with the hydraulic main station, and the cleaning and filtering device and the dirt collecting box are interconnected.

[0005] As a further improvement of the above scheme, the cleaning and filtering equipment includes an oil tank, an oil inlet filter, an oil pump, a motor, a coarse filter, a precision filter element, an oil-water separator and a clean oil tank. The oil pump is arranged between the oil tank and the coarse filter, and the oil pump is driven by a motor. An oil inlet filter is arranged at the outlet of the oil tank, a No. 2 pressure reducing valve is arranged between the oil pump and the oil inlet filter, a protection switch is arranged between the oil pump and the coarse filter, two precision filter elements are arranged, the coarse filter and the two precision filter elements are connected to each other, one end of the precision filter element away from the coarse filter is connected to the oil-water separator, one end of the oil-water separator away from the precision filter element is connected to the clean oil tank, and a No. 3 pressure reducing valve is arranged between the oil-water separator and the clean oil tank.

[0006] As a further improvement of the above solution, a No. 1 pressure reducing valve is provided on both the ERC oil circuit and the incoming oil circuit.

[0007] As a further improvement of the above solution, a negative pressure gauge is provided between the coarse filter screen and the precision filter element.

[0008] As a further improvement of the above solution, a positive pressure gauge is provided between the oil pump and the coarse filter.

[0009] A method for cleaning a hydraulic system of an oil delivery arm comprises the following steps: Step 1, material preparation: new hydraulic oil of the same brand with twice the capacity of the oil tank, a cleaning and filtering device, 15 pieces of 500 mm square pure cotton cloth, an open-end wrench and an inner hexagon wrench, a 500 ml measuring cylinder, a rubber hammer, a 10 micron filter element, a 170 liter empty oil drum and a square workbench; Step 2: Hydraulic system control of the oil delivery arm before cleaning: S1. Disconnect the oil return line of the hydraulic system, install a cleaning and filtering device, and remove the filter element of the original oil return filter; S2. Start the hydraulic system, adjust the main relief valve pressure to 1MPa, and preheat the oil temperature to about 55℃ under this pressure; S3. Remove the high-pressure hose connectors at the oil inlet and outlet of the actuator, and use a straight-through connector to short-circuit the two high-pressure hoses. Direction control components, such as proportional valves, servo valves and other high-precision components, are replaced with ordinary reversing valves. The throttle valve and pressure reducing valve in the circuit should be adjusted to the maximum opening. If the system has an accumulator, its oil inlet valve must be reliably closed. S4. Remove the oil return pipe, install a special oil filter connecting cable, and insert its oil return port into a 170-liter empty oil drum; Step 3, cleaning process: S1, hydraulic oil replacement, start the hydraulic pump, and complete the reversal of each branch reversing valve of the hydraulic system in turn. At the same time, observe the return oil pipe outlet of the 170-liter empty oil barrel until clean hydraulic oil is sprayed out. During the replacement of hydraulic oil, use a refueling machine to replenish new hydraulic oil to the hydraulic oil tank in time. Finally, connect the return oil pipe to the return oil filter; S2. Carry out cleaning. Start the hydraulic pump and press the fault button on the head of the reversing valve solenoid using a manual button or a No. 4 hexagonal wrench. Switch on the two directions of each reversing valve in the hydraulic system in turn to connect the cleaning filter equipment. The connection time is 30 minutes and the cleaning filter equipment is cleaned.

[0010] S3. Knock the pipeline. During the flushing process, use a rubber hammer to knock the oil pipe along the pipeline. Knock continuously to facilitate the removal of attachments in the pipeline. S4. Flushing effect inspection: when the hydraulic pump is working, take a sample of hydraulic oil from the hydraulic oil tank for inspection. During this process, the sampling container must be clean and the operation process must be clean to avoid errors in the measured values. S5. Subsequent adjustment: After flushing is qualified, stop running the hydraulic pump, remove the 10-micron high-precision filter element in the return oil filter, install a new return oil filter element, then remove the straight-through joint and high-pressure hose in turn, connect the high-pressure hose joint to the hydraulic actuator respectively, install a new high-pressure filter element, open the oil inlet valve of the accumulator, and readjust the pressure and flow valve of the main overflow valve of the system to meet the design requirements. During the operation, pay attention to keeping each interface clean to avoid secondary pollution. During the process, use pure cotton cloth to clean the oily areas. As a further improvement of the above scheme, the cleaning step of cleaning the filtering device on S2 in step 3 is: A. Primary filtration: Driven by the motor, the oil pump starts to work and extracts the hydraulic oil from the oil tank of the hydraulic main station. The hydraulic oil first passes through the oil inlet filter and the coarse filter to filter out larger particles of impurities; B. Secondary filtration: The hydraulic oil is filtered through a precision filter element for secondary filtration; C. Oil-water separation: After passing through the precision filter element, the hydraulic oil flows into the oil-water separator to further remove the water and some tiny impurities in the oil to ensure the cleanliness of the hydraulic oil; D. Pressure regulation: The pressure inside the system is controlled by the No. 3 pressure reducing valve to ensure that the pressure during the cleaning process is stable and does not cause damage to the equipment; E. Pressure monitoring: The positive pressure gauge and negative pressure gauge display the pressure value in the system in real time, so that the operator can monitor the operating status of the equipment at any time; F. Circulation loop: The cleaning and filtering equipment and the oil tank of the hydraulic main station of the oil transfer arm form a closed loop. When the oil transfer arm performs repeated equipment movements, the hydraulic oil circulates in the system. At this time, the oil pump continuously extracts the hydraulic oil and returns it to the tank. During this process, the hydraulic oil continues to pass through the precision filter element and the oil-water separator to ensure that the impurities in the hydraulic system are completely filtered out; G. Final return: After multiple cycles and filtration, the clean hydraulic oil finally returns to the oil tank, thus completing the entire cleaning process.

[0011] Compared with the prior art, the present invention has the following beneficial effects: 1. The cleaning device of the present invention can effectively remove tiny metal debris, particulate matter and moisture in the hydraulic system through multi-stage filtration and oil-water separation, which is more thorough than the conventional method of replacing hydraulic oil, solves the problem of solenoid valve core jamming, maintains the cleanliness of hydraulic oil, reduces the wear of impurities on moving parts, thereby extending the service life of the oil transfer arm and reducing the maintenance frequency and maintenance cost.

[0012] 2. The present invention ensures that the hydraulic system is always kept highly clean by continuously circulating and filtering the hydraulic oil, reducing failures caused by impurities and ensuring long-term stable operation of the equipment. The pressure gauge and pressure reducing valve are equipped to monitor and adjust the internal pressure of the system in real time, ensuring a safe and efficient cleaning process and preventing pressure fluctuations from causing damage to the equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for describing the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying creative work.

[0014] Figure 1 A schematic diagram of a hydraulic system cleaning process of a cleaning device and method for a hydraulic system of an oil delivery arm according to the present invention; Figure 2 It is a schematic diagram of the principle of a cleaning and filtering device of a cleaning device and method for a hydraulic system of an oil delivery arm of the present invention; Figure 3 A schematic diagram of the cleaning steps of a hydraulic system of a cleaning device and method for a hydraulic system of an oil delivery arm according to the present invention; Figure 4 The present invention is a schematic diagram of the steps of cleaning the filter equipment of a cleaning device and method for a hydraulic system of an oil delivery arm.

[0015] In the figure: 1. Oil transfer arm; 2. Oil cylinder; 3. No. 1 pressure reducing valve; 4. Hydraulic main station; 5. Overflow valve; 6. Hydraulic substation; 7. Cleaning and filtering equipment; 8. Oil tank; 9. Sewage collecting box; S. ERC oil circuit; P. Inlet oil circuit; T. Return oil circuit; 10. Oil inlet filter; 11. No. 2 pressure reducing valve; 12. Positive pressure gauge; 13. Coarse filter; 14. Negative pressure gauge; 15. Precision filter element; 16. Oil-water separator; 17. No. 3 pressure reducing valve; 18. Oil pump; 19. Protection switch; 20. Motor; 21. Clean oil tank. DETAILED DESCRIPTION

[0016] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the present invention is further explained below in conjunction with specific implementation methods.

[0017] In the description of the present invention, it should be noted that the terms "upper", "lower", "inner", "outer", "front end", "rear end", "two ends", "one end", "the other end" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply 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" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0018] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "provided with", "connected", etc. should be understood in a broad sense. For example, "connected" 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.

[0019] The technical solution of the present invention is further described below in conjunction with the accompanying drawings.

[0020] like Figure 1-Figure 4 As shown, a cleaning device for an oil delivery arm hydraulic system comprises an oil delivery arm 1, a hydraulic main station 4, a hydraulic substation 6, a cleaning and filtering device 7, an oil tank 8 and a dirt collecting box 9, and is characterized in that: three oil delivery arms 1 and three hydraulic substations 6 are each provided, the three oil delivery arms 1 are respectively connected to the three hydraulic substations 6, the three oil delivery arms 1 are each provided with an oil cylinder 2, an ERC oil circuit S, an incoming oil circuit P and a return oil circuit T are each provided between the three hydraulic substations 9 and the hydraulic main station 4, the cleaning and filtering device 7 is located between the oil tank 8 and the dirt collecting box 9, the oil tank 8 is interconnected with the hydraulic main station 4 and the cleaning and filtering device 7, and an overflow valve 5 is provided between the oil tank 8 and the hydraulic main station 4 and the cleaning and filtering device 7, the cleaning and filtering device 7 and the hydraulic main station 4 are interconnected, the cleaning and filtering device 7 and the dirt collecting box 9 are interconnected, and a No. 1 pressure reducing valve 3 is provided on the ERC oil circuit S and the incoming oil circuit P.

[0021] The cleaning and filtering device 7 includes an oil tank 8, an oil inlet filter 10, an oil pump 18, a motor 20, a coarse filter 13, a precision filter element 15, an oil-water separator 16 and a clean oil tank 21. The oil pump 18 is arranged between the oil tank 8 and the coarse filter 13. The oil pump 18 is driven by the motor 20. The outlet of the oil tank 8 is provided with an oil inlet filter 10. A No. 2 pressure reducing valve 11 is arranged between the oil pump 18 and the oil inlet filter 10. A protection switch 19 is arranged between the oil pump 18 and the coarse filter 13. The precision filter element 15 is provided with a protective switch 19. Two cores 15 are provided, the coarse filter 13 and the two precision filter elements 15 are connected to each other, the end of the precision filter element 15 away from the coarse filter 13 is connected to the oil-water separator 16, the end of the oil-water separator 16 away from the precision filter element 15 is connected to the clean oil tank 21, a No. 3 pressure reducing valve 17 is provided between the oil-water separator 16 and the clean oil tank 21, a negative pressure gauge 14 is provided between the coarse filter 13 and the precision filter element 15, and a positive pressure gauge 12 is provided between the oil pump 18 and the coarse filter 13.

[0022] A method for cleaning a hydraulic system of an oil delivery arm comprises the following steps: Step 1, material preparation: new hydraulic oil of the same brand with twice the capacity of the oil tank, cleaning and filtering equipment 7, 15 pieces of 500 mm square pure cotton cloth, an open-end wrench and an inner hexagon wrench, a 500 ml measuring cylinder, a rubber hammer, a 10 micron filter element, a 170 liter empty oil drum and a square workbench; Step 2: Control of the hydraulic system of the oil delivery arm before cleaning: S1: disconnect the oil return line of the hydraulic system, install the cleaning and filtering equipment 7, and remove the filter element of the original oil return filter; S2. Start the hydraulic system, adjust the main relief valve pressure to 1MPa, and preheat the oil temperature to about 55℃ under this pressure; S3. Remove the high-pressure hose connectors at the oil inlet and outlet of the actuator, and use a straight-through connector to short-circuit the two high-pressure hoses. Direction control components, such as proportional valves, servo valves and other high-precision components, are replaced with ordinary reversing valves. The throttle valve and pressure reducing valve in the circuit should be adjusted to the maximum opening. If the system has an accumulator, its oil inlet valve must be reliably closed. S4. Remove the oil return pipe, install a special oil filter connecting cable, and insert its oil return port into a 170-liter empty oil drum; Step 3, cleaning process: S1, hydraulic oil replacement, start the hydraulic pump, and complete the reversal of each branch reversing valve of the hydraulic system in turn. At the same time, observe the return oil pipe outlet of the 170-liter empty oil barrel until clean hydraulic oil is sprayed out. During the replacement of hydraulic oil, use a refueling machine to replenish new hydraulic oil to the hydraulic oil tank in time. Finally, connect the return oil pipe to the return oil filter; S2. Cleaning is carried out. The hydraulic pump is started. The fault button on the head of the reversing valve solenoid is pressed using a manual button or a No. 4 hexagonal wrench. The two directions of each reversing valve in the hydraulic system are switched on and the cleaning filter device 7 is switched on for 30 minutes. The cleaning filter device 7 is cleaned. The cleaning steps are as follows: A. Primary filtration: Driven by the motor 20, the oil pump 18 starts to work and extracts the hydraulic oil from the oil tank 8 of the hydraulic main station 4. The hydraulic oil first passes through the oil inlet filter 10 and the coarse filter 13 to filter out larger particles of impurities; B. Secondary filtration: The hydraulic oil is filtered through the precision filter element 15 for secondary filtration; C. Oil-water separation: After passing through the precision filter element 15, the hydraulic oil flows into the oil-water separator 16 to further remove the water and some tiny impurities in the oil to ensure the cleanliness of the hydraulic oil; D. Pressure regulation: The pressure inside the system is controlled by the No. 3 pressure reducing valve 17 to ensure that the pressure during the cleaning process is stable and does not cause damage to the equipment; E. Pressure monitoring: The positive pressure gauge 12 and the negative pressure gauge 14 display the pressure value in the system in real time, so that the operator can monitor the operating status of the equipment at any time; F. Circulation loop: The cleaning and filtering device 7 and the oil tank 8 of the oil transfer arm hydraulic main station 4 form a closed loop. When the oil transfer arm performs repeated equipment movements, the hydraulic oil circulates in the system. At this time, the oil pump 18 continuously extracts the hydraulic oil and returns it to the oil tank 8. During this process, the hydraulic oil continues to pass through the precision filter element 15 and the oil-water separator 16 to ensure that impurities in the hydraulic system are completely filtered out; G. Final return: After multiple cycles and filtration, the clean hydraulic oil finally returns to the oil tank 8, thus completing the entire cleaning process; S3. Knock the pipeline. During the flushing process, use a rubber hammer to knock the oil pipe along the pipeline. Knock continuously to facilitate the removal of attachments in the pipeline. S4. Flushing effect inspection: when the hydraulic pump is working, take a sample of hydraulic oil from the hydraulic oil tank for inspection. During this process, the sampling container must be clean and the operation process must be clean to avoid errors in the measured values. S5. Subsequent adjustments: After flushing is qualified, stop running the hydraulic pump, remove the 10-micron high-precision filter element in the return oil filter, install a new return oil filter element, then remove the straight joint and high-pressure hose in turn, connect the high-pressure hose joint to the hydraulic actuator respectively, install a new high-pressure filter element, open the oil inlet valve of the accumulator, and readjust the pressure and flow valve of the system's main overflow valve to meet the design requirements. During the operation, pay attention to keeping each interface clean to avoid secondary contamination. During the process, use pure cotton cloth to clean the oily areas.

[0023] The above shows and describes the basic principles and main features of the present invention and the advantages of the present invention. It should be understood by those skilled in the art that the present invention is not limited to the above embodiments. The above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention to be protected. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A cleaning device for a hydraulic system of an oil delivery arm, comprising an oil delivery arm (1), a hydraulic main station (4), a hydraulic substation (6), a cleaning and filtering device (7), an oil tank (8) and a dirt collecting tank (9), characterized in that: The oil delivery arms (1) and the hydraulic substations (6) are each provided with three, the three oil delivery arms (1) are respectively connected to the three hydraulic substations (6), the three oil delivery arms (1) are each provided with an oil cylinder (2), the three hydraulic substations (6) and the hydraulic main station (4) are each provided with an ERC oil circuit (S), an incoming oil circuit (P) and a return oil circuit (T), the cleaning and filtering device (7) is located between the oil tank (8) and the sewage collecting box (9), the oil tank (8) and the hydraulic main station (4) and the cleaning and filtering device (7) are all interconnected, and an overflow valve (5) is provided between the oil tank (8) and the hydraulic main station (4) and the cleaning and filtering device (7), the cleaning and filtering device (7) and the hydraulic main station (4) are interconnected, and the cleaning and filtering device (7) and the sewage collecting box (9) are interconnected; The cleaning and filtering device (7) comprises an oil tank (8), an oil inlet filter (10), an oil pump (18), a motor (20), a coarse filter (13), a precision filter element (15), an oil-water separator (16) and a clean oil tank (21); the oil pump (18) is arranged between the oil tank (8) and the coarse filter (13); the oil pump (18) is driven by the motor (20); an oil inlet filter (10) is arranged at the outlet of the oil tank (8); and a No. 2 pressure reducing valve (11) is arranged between the oil pump (18) and the oil inlet filter (10). A protection switch (19) is provided between the oil pump (18) and the coarse filter (13), two precision filter elements (15) are provided, the coarse filter (13) and the two precision filter elements (15) are connected to each other, one end of the precision filter element (15) away from the coarse filter (13) is connected to an oil-water separator (16), one end of the oil-water separator (16) away from the precision filter element (15) is connected to a clean oil tank (21), and a No. 3 pressure reducing valve (17) is provided between the oil-water separator (16) and the clean oil tank (21).

2. The cleaning device of the hydraulic system of an oil delivery arm according to claim 1, characterized in that: The ERC oil circuit (S) and the incoming oil circuit (P) are both provided with a No. 1 pressure reducing valve (3).

3. The cleaning device of the hydraulic system of an oil delivery arm according to claim 1, characterized in that: A negative pressure gauge (14) is provided between the coarse filter screen (13) and the precision filter element (15).

4. The cleaning device for the hydraulic system of an oil delivery arm according to claim 1, characterized in that: A positive pressure gauge (12) is provided between the oil pump (18) and the coarse filter (13).

5. A method for cleaning a hydraulic system of an oil delivery arm according to any one of claims 1 to 4, characterized in that: The following steps are involved: Step 1: Prepare materials: new hydraulic oil of the same brand with twice the tank capacity, cleaning and filtering equipment (7), 15 pieces of 500 mm square cotton cloth, open-end wrench and hexagonal wrench, 500 ml measuring cylinder, rubber hammer, 10 micron filter element, 170 liter empty oil drum and square workbench; Step 2: Hydraulic system control of the oil delivery arm before cleaning: S1: disconnect the oil return line of the hydraulic system, install a cleaning filter device (7), and remove the filter element of the original oil return filter; S2. Start the hydraulic system, adjust the main relief valve pressure to 1MPa, and preheat the oil temperature to about 55℃ under this pressure; S3. Remove the high-pressure hose connectors at the oil inlet and outlet of the actuator, and use a straight-through connector to short-circuit the two high-pressure hoses. Direction control components, such as proportional valves, servo valves and other high-precision components, are replaced with ordinary reversing valves. The throttle valve and pressure reducing valve in the circuit should be adjusted to the maximum opening. If the system has an accumulator, its oil inlet valve must be reliably closed. S4. Remove the oil return pipe, install a special oil filter connecting cable, and insert its oil return port into a 170-liter empty oil drum; Step 3, cleaning process: S1, hydraulic oil replacement, start the hydraulic pump, and complete the reversing of each branch reversing valve of the hydraulic system in turn. At the same time, observe the return oil pipe outlet of the 170-liter empty oil barrel until clean hydraulic oil is sprayed out. During the replacement of hydraulic oil, use a refueling machine to replenish new hydraulic oil to the hydraulic oil tank in time. Finally, connect the return oil pipe to the return oil filter; S2. Cleaning is performed by starting the hydraulic pump and pressing the fault button on the head of the reversing valve solenoid by using a manual button or a No. 4 hexagonal wrench. The two directions of each reversing valve in the hydraulic system are switched on and the cleaning filter device (7) is switched on for 30 minutes. The cleaning filter device (7) is cleaned. S3. Knock the pipeline. During the flushing process, use a rubber hammer to knock the oil pipe along the pipeline. Knock continuously to facilitate the removal of attachments in the pipeline. S4. Flushing effect inspection: when the hydraulic pump is working, take a sample of hydraulic oil from the hydraulic oil tank for inspection. During this process, the sampling container must be clean and the operation process must be clean to avoid errors in the measured values. S5. Subsequent adjustments: After flushing is qualified, stop running the hydraulic pump, remove the 10-micron high-precision filter element in the return oil filter, install a new return oil filter element, then remove the straight joint and high-pressure hose in turn, connect the high-pressure hose joint to the hydraulic actuator respectively, install a new high-pressure filter element, open the oil inlet valve of the accumulator, and readjust the pressure and flow valve of the system's main overflow valve to meet the design requirements. During the operation, pay attention to keeping each interface clean to avoid secondary contamination. During the process, use pure cotton cloth to clean the oily areas.

6. A method for cleaning a hydraulic system of an oil delivery arm according to claim 5, characterized in that: The cleaning step of cleaning the filter device (7) on S2 in step 3 is: A. Primary filtration: Driven by the motor (20), the oil pump (18) starts to work and extracts the hydraulic oil from the oil tank (8) of the hydraulic main station (4). The hydraulic oil first passes through the oil inlet filter (10) and the coarse filter (13) to filter out larger particles of impurities; B. Secondary filtration: The hydraulic oil is filtered through a precision filter element (15). C. Oil-water separation: After passing through the precision filter element (15), the hydraulic oil flows into the oil-water separator (16) to further remove the water and some tiny impurities in the oil to ensure the cleanliness of the hydraulic oil; D. Pressure regulation: The pressure inside the system is controlled by the No. 3 pressure reducing valve (17) to ensure that the pressure during the cleaning process is stable and does not cause damage to the equipment; E. Pressure monitoring: The positive pressure gauge (12) and the negative pressure gauge (14) display the pressure value in the system in real time, so that the operator can monitor the operating status of the equipment at any time; F. Circulation loop: The cleaning and filtering device (7) and the oil tank (8) of the oil transfer arm hydraulic main station (4) form a closed loop. When the oil transfer arm performs repeated equipment movements, the hydraulic oil circulates in the system. At this time, the oil pump (18) continuously extracts the hydraulic oil and returns it to the oil tank (8). During this process, the hydraulic oil continues to pass through the precision filter element (15) and the oil-water separator (16), ensuring that impurities in the hydraulic system are completely filtered out; G. Final return: After multiple cycles and filtration, the clean hydraulic oil finally returns to the oil tank (8), thus completing the entire cleaning process.

Images