Oil water removal device of hydraulic system

Abstract

The utility model discloses an oil liquid dewatering device of a hydraulic system, and belongs to the technical field of aircraft hydraulic pressure. Comprising a vehicle body structure, a hydraulic power source unit, a vacuum purification unit, an electrical unit and a display control unit, the hydraulic power source unit is connected with other units and comprises a purification tank, and a purification pipeline system and an oil filling pipeline system which are communicated with the purification tank; the vacuum purification unit is used for providing a vacuum condition, separating water, air and impurities in the oil liquid in the purification tank, and taking away and discharging separated gaseous substances through dry airflow; the vehicle body structure comprises four bearing wheels and a semi-closed vehicle body. According to the invention, an onboard hydraulic system or a local pipeline and a station hydraulic equipment hydraulic system are purified, and pollutants such as solid particles, moisture, gas, chloride and the like in the hydraulic system are removed.

Description

Technical Field

[0001] The invention belongs to the technical field of aircraft hydraulics, and in particular relates to an oil water removal device for a hydraulic system. Background Art

[0002] Solid particulate contamination in aircraft hydraulic fluids is a concern, and appropriate measures are being implemented to control it. However, water contamination, which deteriorates fluid performance and leads to component loss, is no less detrimental than the impact of particulate contamination on the system. Consequently, a growing number of researchers are realizing that only by controlling hydraulic fluid contamination can equipment reliability and utilization be improved. This is crucial for aircraft hydraulic fluid control vehicles, which primarily perform tasks such as bottom-surface inspection and fluid purification in aircraft hydraulic systems.

[0003] All petroleum-based fluids have varying degrees of water absorption, with hydraulic oil's water saturation typically ranging from 200-300 ppm. Hydraulic systems should be kept as water-free as possible. When water contamination occurs, appropriate measures should be selected based on the amount of water, the type of hydraulic fluid, and the characteristics of the hydraulic system itself. Common water removal methods, depending on their principles, include vacuum separation, centrifugal separation, coalescence separation, and adsorption. These methods should also be used in conjunction with natural sedimentation.

[0004] The oil purification equipment currently used has a complex structure and cannot directly purify the on-board hydraulic system or local pipelines and the hydraulic system of the hydraulic equipment at the station on site. It is also unable to clean / purify itself. After long-term use, the purification effect is reduced and cannot meet the purification standard requirements. Summary of the Invention

[0005] Technical issues to be solved:

[0006] To overcome the shortcomings of the prior art, the present invention provides a hydraulic system oil dewatering device. Utilizing the principle of mass transfer under vacuum conditions, this device employs a hydraulic power source unit and a vacuum purification unit to purify the hydraulic system onboard an aircraft, local piping, and the hydraulic system of hydraulic equipment at a terminal, removing contaminants such as solid particles, moisture, gas, and chlorides. The device also connects the oil supply and return connections via a self-circulating interface to clean / purify the equipment's hydraulic system, removing contaminants such as solid particles, moisture, gas, and chlorides, ensuring that the oil used in the equipment meets the cleanliness requirements for on-line use.

[0007] The technical solution of the present invention is: an oil dewatering device for a hydraulic system, characterized by comprising a vehicle body structure and a hydraulic power source unit, a vacuum purification unit, an electrical unit, and a display control unit mounted thereon;

[0008] The hydraulic power source unit is connected to other units, including a purification tank and a purification pipeline system and a refueling pipeline system connected thereto. The purification pipeline system includes an input pipeline and an output pipeline connected between the external hydraulic equipment and the purification tank, and cooperates with the vacuum purification unit to achieve water removal and purification of the oil of the external hydraulic equipment; the refueling pipeline system is connected between the oil barrel and the purification tank, and is used to refuel the purification tank;

[0009] The vacuum purification unit is used to provide vacuum conditions to separate water, air and impurities from the oil in the purification tank, and to carry away and discharge the separated gaseous substances through a dry airflow;

[0010] The electrical unit is used for power supply and circuit protection of the entire device;

[0011] The display control unit is used to control and display the operation and status of the entire device to achieve human-computer interaction;

[0012] The vehicle body structure includes four load-bearing wheels and a semi-enclosed vehicle body. An electrical control cabinet accommodating an electrical unit is arranged at the front of the interior of the vehicle body, and a display control unit is installed on the upper part of the electrical control cabinet; a pushing handle is arranged at the front end of the exterior of the vehicle body; ventilation shutters are arranged at the front end of the vehicle body, and ventilation movable doors are arranged at the rear end for ventilation and heat dissipation of the entire vehicle, and the left and right sides are movable door covers; water retaining lines are arranged at the joints of the door covers of the vehicle body, and sealing strips are installed, and the entire vehicle is waterproofed.

[0013] A further technical solution of the present invention is that lifting and mooring structures are provided at the four corners of the chassis of the vehicle body.

[0014] A further technical solution of the present invention is: a differential pressure transmitter and an absolute pressure transmitter are installed on the purification tank, the differential pressure transmitter is used to monitor the liquid level in the tank, when the liquid level exceeds the set value, the system will stop and prompt the user; the absolute pressure transmitter is used to monitor the vacuum degree in the tank, when the vacuum degree exceeds the set value, the system will stop and prompt the user.

[0015] A further technical solution of the present invention is: the purification pipeline system is connected to the external hydraulic equipment through a quick connector, and a back pressure valve is provided on the input pipeline connecting the external hydraulic equipment and the purification tank, and the flow rate of oil flowing into the purification tank is controlled by the back pressure valve; a gear pump, a one-way valve, an oil filter, a pressure transmitter, a temperature transmitter, a pressure regulating stop valve, a sampling valve, and a safety valve are sequentially provided on the output pipeline between the purification tank and the external hydraulic equipment, the purified oil is extracted by the gear pump, and the gear pump is protected by the one-way valve, the pressure and temperature of the oil in the pipeline are monitored by the pressure transmitter and the temperature transmitter, the oil pressure in the pipeline is adjusted by the pressure regulating stop valve, and the oil in the pipeline is sampled by the sampling valve for offline contamination detection.

[0016] A further technical solution of the present invention is: the refueling pipeline system is connected to the output pipeline of the purification pipeline system through a reversing valve, and a refueling filter and a refueling stop valve are arranged along the pipeline in sequence. The reversing valve is switched to the refueling position, the refueling stop valve and the pressure regulating stop valve are opened, and the motor is started to drive the gear pump to complete the refueling of the purification tank.

[0017] A further technical solution of the present invention is: the vacuum purification unit includes a vacuum pump and a dry air flow transmission pipeline, the vacuum pump is connected to the purification tank through the pipeline, and an oil-water separator is provided on the pipeline; the dry air flow transmission pipeline connects the air to the purification tank, and a flow regulating valve and an air filter are sequentially provided on the pipeline; under vacuum conditions, the dry air enters the purification tank through the flow regulating valve and the air filter to complete the separation of water, air, and impurities in the oil liquid inside, and then the gasified substances are discharged through the oil-water separator and the vacuum pump.

[0018] A further technical solution of the present invention is that the electrical unit is powered by AC220V / 50Hz and is composed of a leakage protector, a contactor, a servo driver, a relay, a switching power supply, and a power cable. The power supply has overcurrent, leakage, overvoltage, undervoltage, and short-circuit protection prompts.

[0019] The leakage protector is used for overcurrent and leakage protection of the main power supply circuit and as a switch to cut off the power supply during maintenance. It is selected as a 2-pole 2A with a leakage current of 30mA;

[0020] The relay is used for system power switch and automatic / manual conversion of pressure regulation;

[0021] The switching power supply is used to power the control panel, sensors, solenoid valves, and relays. It has an output power of 150W and an input voltage range of 175V to 264V at 50Hz / 60Hz. It has shielding measures to prevent electromagnetic radiation from interfering with the control system.

[0022] The servo driver is used for speed control of the oil pump motor;

[0023] The power cable is used for external power supply and adopts a three-core cable, 3×1.0 mm2, and a length of 20 m.

[0024] A further technical solution of the present invention is: the display control unit includes a control panel and a display operation interface, the control panel monitors the pressure and temperature parameters of the device in real time through the integrated AD analog input channel, monitors the oil filter status through the DI switch input channel, and displays the data on the operation interface after system data information processing; the display operation interface is used to realize human-computer interaction, and the device performs data analysis through interface operation instruction feedback, controls the start and stop of the vacuum pump and motor pump and the motor speed, thereby realizing the refueling and circulation cleaning / purification functions of the device purification tank.

[0025] Advantages

[0026] The oil liquid water removing device of the present application works in parallel with external hydraulic equipment, uses the principle of material transfer under moderate vacuum condition, combines the purification tank, and cleans and purifies the hydraulic system of the hydraulic equipment on the machine or the local pipeline and the hydraulic system of the hydraulic equipment at the station (quickly removes the solid particles, moisture, gas, chlorides and other pollutants in the hydraulic system.), and the whole process is automatically realized to serve the tracking of pressure, flow, power and speed, so that the system is always in the best matching state.

[0027] The vehicle body structure of the present application adopts four-wheel load bearing, the wheels adopt oil-resistant rubber wheels, the front universal wheels are provided with parking brake, and the vehicle is convenient to move and can meet various application sites, and the problem that the oil liquid cannot be purified on site in the prior art is solved. BRIEF DESCRIPTION OF DRAWINGS

[0028] Figure 1 Principle block diagram

[0029] Figure 2 System composition schematic diagram

[0030] Figure 3 Vehicle body structure schematic diagram

[0031] Figure 4 Hydraulic principle diagram

[0032] Figure 5 Purification tank appearance schematic diagram

[0033] Figure 6 Machine connection purification hydraulic principle diagram

[0034] Figure 7 Self-circulation cleaning / purification hydraulic principle diagram

[0035] Figure 8 Device purification tank oil adding hydraulic principle diagram

[0036] Figure 9 Electrical principle schematic diagram

[0037] Figure 10 Operation main interface schematic diagram

[0038] Explanation of reference numerals: 1. Fueling hose 2. Fueling filter 3. Fueling stop valve 4. Manual reversing valve 5. Gear pump 6. Motor 7. Check valve 8. Fuel supply filter 9. Pressure transmitter 10. Temperature transmitter 11. Pressure regulating stop valve 12. Sampling valve 13. Safety valve 14. Fuel supply hose 15. First quick connector 16. Second quick connector 17. Oil return hose 18. Flow control valve 19. Air filter (coarse) 20. Air filter (fine) 21. Purification tank 22. Differential pressure sensor Sensor 23. Absolute pressure sensor 24. Transparent hose 25. Oil-water separator 26. Vacuum pump 27. Back pressure valve 28. First self-circulation joint 29. Second self-circulation joint; 30. Vehicle body structure, 31. Hydraulic power source unit, 32. Vacuum purification unit, 33. Electrical unit, 34. Display control unit; 35. Oil-liquid dispersion and water-gas separation device, 36. Oil return port, 37. Oil suction / refueling port, 38. Oil drain port, 39. Visual liquid level indication, 40. Liquid level sensor. DETAILED DESCRIPTION

[0039] The embodiments described below with reference to the accompanying drawings are exemplary and are intended to explain the present invention, but should not be construed as limiting the present invention.

[0040] Based on the fact that the oil purification equipment in the prior art cannot directly go to the site to purify the hydraulic system or local pipelines on the aircraft and the hydraulic system of the hydraulic equipment at the station, and cannot clean / purify itself, the purification effect is reduced after long-term use and cannot meet the purification standard requirements, the present invention provides an oil dewatering device for a hydraulic system, including a vehicle body structure and a hydraulic power source unit, a vacuum purification unit, an electrical unit, and a display control unit mounted thereon. The hydraulic power source unit is connected to other units, including a purification tank and a purification pipeline system and a refueling pipeline system connected thereto. The purification pipeline system includes an input pipeline and an output pipeline connected between the external hydraulic equipment and the purification tank, and cooperates with the vacuum purification unit to realize oil dewatering and purification of the external hydraulic equipment; the refueling pipeline system is connected to the oil barrel and the purification tank. The space between the tanks is used to refuel the purification tank; the vacuum purification unit is used to provide vacuum conditions to separate the water, air and impurities in the oil in the purification tank, and to carry away and discharge the separated gaseous substances through dry airflow; the electrical unit is used for power supply and circuit protection of the entire device; the display control unit is used to control and display the operation and status display of the entire device to achieve human-computer interaction; the body structure includes four load-bearing wheels and a semi-enclosed body, an electrical control cabinet for accommodating the electrical unit is arranged at the front of the interior of the body, and a display control unit is installed on the upper part of the electrical control cabinet; a pushing handle is provided at the front end of the exterior of the body; ventilation shutters are provided at the front end of the body, and ventilation movable doors are provided at the rear end for ventilation and heat dissipation of the entire vehicle, and the left and right sides are movable door covers; water retaining lines are provided at the joints of the door covers of the body, and sealing strips are installed, and the entire vehicle is waterproofed.

[0041] The oil dehydration device of the present invention works in parallel with the external hydraulic equipment, uses the principle of material transfer under moderate vacuum conditions, and combines the "oil divergence and water vapor separation device" of the purification tank to clean and purify the on-board hydraulic system or local pipelines and the hydraulic system of the station hydraulic equipment (quickly remove solid particles, moisture, gas, chloride and other pollutants in the hydraulic system). The whole process automatically realizes servo tracking of pressure, flow, power and speed, so that the system is always in the best matching state.

[0042] The above technical solution is further described below with reference to the accompanying drawings:

[0043] This embodiment provides an oil dewatering device that, in conjunction with a universal hydraulic adapter, removes water from an aircraft's hydraulic system. This device, in conjunction with the universal hydraulic adapter, purifies the hydraulic system, local piping, and the hydraulic system of field equipment, removing contaminants such as solid particles, moisture, gas, and chloride. The device operates with aviation hydraulic oils such as No. 15 (GJB1177A-2013) and YH-10 (SY1181-1976). The operating pressure is manually adjustable from 0 to 0.5 MPa, and the flow rate is 0 to 20 L / min. The hydraulic contamination level is rated at no less than GJB420B-6 for solid particle contamination in the hydraulic system, with a water content not exceeding 100 ppm.

[0044] Reference Figure 1 As shown, in this embodiment, an oil dewatering device operates in parallel with a hydraulic universal adapter. An electrical power supply supplies power to a hydraulic power source unit, a vacuum purification unit, and a display control unit, respectively. The display control unit is connected to the hydraulic power source unit and the vacuum purification unit for automated control and human-machine interaction. The hydraulic power source unit is connected to the hydraulic universal adapter. Utilizing the principle of material transfer under moderate vacuum conditions, combined with the "oil-liquid-water-gas separation device" of the purification tank, the onboard hydraulic system, local piping, and the hydraulic system of hydraulic equipment at the terminal are cleaned and purified (rapidly removing solid particles, moisture, gas, chlorides, and other contaminants from the hydraulic system). The entire process automatically achieves servo tracking of pressure, flow, power, and speed, ensuring the system is always optimally matched.

[0045] Reference Figure 2 、 3As shown, the hydraulic power source unit, vacuum purification unit, electrical unit, and display control unit are mounted on the vehicle body. The vehicle body structure features four load-bearing wheels, each made of oil-resistant rubber, and the front universal wheels have a parking brake. An electrical control cabinet is located at the front of the vehicle body, with a control display screen mounted above it. The height is designed for easy operation and viewing based on human ergonomics, and it is equipped with operation buttons. The display screen has a dust cover and a removable door at the bottom for easy maintenance. Cable and hose retraction brackets are installed inside the vehicle body. A push handle is located at the front of the vehicle body. Ventilation louvers are installed at the front of the vehicle body, and a removable door at the rear of the vehicle body provides ventilation and heat dissipation. The left and right sides of the vehicle body are designed with removable door covers that can be opened left and right to facilitate equipment use and maintenance. Water barriers are installed at the joints between the door covers, and sealing strips are installed, ensuring the entire vehicle is waterproof. Lifting and mooring fixtures are installed at the four corners of the vehicle chassis. The surface of the vehicle body is painted with a baking varnish process, which is resistant to acid, alkali, salt, fog erosion, wear and impact, and is silk-screen marked.

[0046] Reference Figure 4 As shown, the hydraulic power source unit and vacuum purification unit include a refueling hose 1, a refueling oil filter 2, a refueling stop valve 3, a manual reversing valve 4, a gear pump 5, a motor 6, a one-way valve 7, an oil supply filter 8, a pressure transmitter 9, a temperature transmitter 10, a pressure regulating stop valve 11, a sampling valve 12, a safety valve 13, an oil supply hose 14, a first quick connector 15, a second quick connector 16, an oil return hose 17, a flow regulating valve 18, an air filter (coarse) 19, an air filter (fine) 20, a purification tank 21, a differential pressure sensor 22, an absolute pressure sensor 23, a transparent hose 24, an oil-water separator 25, a vacuum pump 26, a back pressure valve 27, a first self-circulation joint 28, and a second self-circulation quick connector 29.

[0047] The gear pump 5 provides the system with a hydraulic power source for cleaning and purification. (Working characteristics are shown in Table 1)

[0048] Table 1: Oil pump operating characteristics

[0049] displacement 13mL / r Flow rate at 1500rpm 19.5L / min Rated pressure 2MPa Speed ​​range (600~3000)rpm Direction of rotation right-handed weight 4.2kg

[0050] The motor 6 is a servo motor used to drive the oil pump. (Working characteristics are shown in Table 2)

[0051] Table 2: Operating characteristics of electric motors

[0052] power 750W Rated voltage AC220V Rated torque 2.4Nm Speed ​​range (500~3000)r / min Protection level IP65 weight 2.5kg

[0053] The one-way valve 7 is used to protect the oil pump, with a maximum flow rate of 60L / min, an opening pressure of 0.05MPa, and a working pressure of 35MPa.

[0054] The pressure transmitter 9 is used for monitoring the system pressure, with a measuring range of (0-1.5) MPa, a power supply of DC24V, an output of (0-5)V, and an accuracy of 0.5% FS.

[0055] The pressure regulating stop valve 11 is used to regulate the system oil supply pressure and unload.

[0056] The oil supply filter 8: 1 pressure supply part (without bypass valve, with pressure differential sensor) (working characteristics see Table 3).

[0057] Table 3: Working characteristics of hydraulic oil filter

[0058] Maximum working pressure 1.7MPa Maximum flow 120L / min Filtration accuracy <![CDATA[1μm,β1≥200]]> Bypass valve none Pressure difference alarm value (2.4±0.2)bar

[0059] The sampling valve 12 is used for sampling and testing the system oil, adopts a needle valve, has a flow rate of 5L / min, and a pressure resistance of ≥1.5Mpa.

[0060] The safety valve 13 provides safety protection for the system oil supply passage.

[0061] The back pressure valve 27 is used to control the flow of oil flowing into the water removal device after being connected to the hydraulic universal adapter.

[0062] The refueling stop valve 3 is used to control the opening of the refueling pipeline.

[0063] The temperature transmitter 10 monitors the system's operating oil temperature and issues an over-temperature shutdown alarm based on the set temperature control point. It has a measurement range of -50°C to 200°C, is powered by 24V DC, and has an output of (0-5)V with an accuracy of 0.5%.

[0064] Among them, the hydraulic pipeline: the return oil part adopts a Ф16 aviation stainless steel pipe; the high-pressure part adopts a Ф13 aviation stainless steel pipe; the refueling part adopts a Ф10 aviation stainless steel pipe.

[0065] The quick connectors 15 and 16 and the self-circulating connectors 28 and 29 are used for quick connection of the oil supply and oil return hoses with the hydraulic universal adapter.

[0066] The oil supply, oil return and refueling hoses 1, 14 and 17 provide external connection pipelines for the equipment. The oil supply hose (13I-2000C) has a length of 2 meters, a diameter of Ф13 and a working pressure of 5 MPa. The oil return hose (19I-2000C) has a length of 2 meters, a diameter of Ф19 and a working pressure of 5 MPa. The refueling hose (10I-2500C) has a length of 2.5 meters, a diameter of Ф10 and a working pressure of 5 MPa. The hoses are marked.

[0067] The vacuum pump 26 of the vacuum purification unit is used to create a vacuum environment in the purification tank (working characteristics are shown in Table 4). Table 4: Working characteristics of vacuum pump

[0068] power supply Single-phase 220V / 50Hz displacement 8m 3 / h]] Motor speed 1440rpm power 400W weight 21kg

[0069] The differential pressure transmitter 22 is used to monitor the oil level in the purification tank. The control system uses this signal to prompt whether to add or drain oil. The power supply is DC24V, the output is (0-5) VDC, the range is (0-10) kPa, and the accuracy is 0.5% FS.

[0070] The absolute pressure transmitter 23 is used to monitor the vacuum degree of the purification tank, with an output of (0-5) VDC, a measuring range of (0-1.5) bar, and an accuracy of 0.5% FS.

[0071] The air filters 19 and 20 are used to filter out impurities in the air entering the purification tank.

[0072] The oil-water separator 25 is used to separate the oil in the gas output from the purification tank.

[0073] The flow regulating valve 18 is used to regulate the amount of external air entering the purification tank, so as to establish a suitable vacuum degree in the purification tank.

[0074] Reference Figure 5 As shown, the purification tank 21 adopts the existing public technology: it is used to three-dimensionally disperse the oil entering the purification tank, so that it forms a physical form that is conducive to the evaporation of water vapor, and to store clean oil. The tank body is made of stainless steel and is equipped with various interfaces, liquid level indicators, etc. The rated volume is 20L and the maximum volume is 30L.

[0075] Reference Figure 6 As shown, the working principle of the oil dehydration device of this embodiment in conjunction with the hydraulic universal adapter for vacuum dehydration is as follows:

[0076] The vacuum dewatering function must be used in parallel with the hydraulic universal adapter. The external hydraulic source must use the closed pressure supply mode. The device pressure / flow control unit I selects the online test / cleaning function to dewater the onboard hydraulic system.

[0077] After connecting quick connector 15 and quick connector 16 to the hydraulic universal adapter, switch reversing valve 4 to the circulation position and start motor 6 and vacuum pump 26. The oil in the hydraulic universal adapter passes through quick connector 16, return oil hose 17, and back pressure valve 27, entering the purification tank 21 (the purification tank is equipped with a differential pressure transmitter 22 to monitor the liquid level in the tank. When the liquid level exceeds the set value, the system will stop and prompt the user). From the purification tank 21, it flows through reversing valve 4, is pumped out by gear pump 5, and passes through check valve 7, oil filter 8, pressure transmitter 9, temperature transmitter 10, pressure regulating stop valve 11, sampling valve 12 (for sampling oil for offline contamination testing), safety valve 13 (used to protect the hydraulic system and prevent excessive oil pressure), oil supply hose 14, and quick connector 15, returning to the hydraulic system of the hydraulic universal adapter.

[0078] At the same time, the vacuum pump 26 is started, and the gas enters the purification tank 21 through the flow regulating valve 18, the air filter (coarse) 19, and the air filter (fine) 20 (the purification tank is equipped with an absolute pressure transmitter 23 to monitor the vacuum degree in the tank. When the vacuum degree exceeds the set value, the system will stop and prompt the user), and then is discharged through the oil-water separator 25 and the vacuum pump 26.

[0079] Reference Figure 7 As shown, the working principle of the oil dewatering device of this embodiment for circulating cleaning / purifying hydraulic pressure is as follows:

[0080] Connect quick connectors 15 and 16 to self-circulating connectors 28 and 29, then switch reversing valve 4 to the circulation position and start motor 6 and vacuum pump 26. The oil flows through purification tank 21, through reversing valve 4, and is pumped out by gear pump 5. It then passes through check valve 7, oil filter 8, pressure transmitter 9, temperature transmitter 10, pressure regulating stop valve 11, sampling valve 12 (for offline contamination testing of oil samples), safety valve 13 (for protecting the hydraulic system from excessive oil pressure), refueling hose 14, quick connector 15, quick connector 16, oil return hose 17, and back-pressure valve 27 before entering purification tank 21.

[0081] When self-circulating purification is carried out, the vacuum pump 26 is started at the same time, and the gas enters the purification tank 21 through the flow regulating valve 18, the air filter (coarse) 19, and the air filter (fine) 20 (the purification tank is equipped with an absolute pressure transmitter 23 to monitor the vacuum degree in the tank. When the vacuum degree exceeds the set value, the system will stop and prompt the user.), and then be discharged through the oil-water separator 25 and the vacuum pump 26.

[0082] The oil supply and return joints of the device are connected through a self-circulating interface to clean / purify the hydraulic system of the equipment and remove solid particles, moisture, gas, chloride and other pollutants in the hydraulic system of the equipment to ensure that the oil used in the equipment meets the cleanliness requirements for online use.

[0083] Reference Figure 8 As shown, the hydraulic working principle of the oil dewatering device purification tank refueling hydraulic pressure in this embodiment is as follows:

[0084] After inserting the refueling hose 1 into the oil barrel, switch the reversing valve 4 to the refueling position, open the refueling stop valve 3 and the pressure regulating stop valve 11, and start the motor 6 to drive the oil pump 5. The oil passes through the refueling hose 1, the refueling filter 2, the refueling stop valve 3, the reversing valve 4, the gear pump 5, the check valve 7, the oil filter 8, the pressure transmitter 9, the temperature transmitter 10, and the pressure regulating stop valve 11, and enters the purification tank 21. When the oil level in the purification tank reaches the set value, the device automatically stops and prompts that refueling is complete.

[0085] Reference Figure 9 As shown, the electrical power supply provides power to each unit at AC 220V / 50Hz and consists of a leakage protector, contactor, servo drive, relay, and switching power supply. The power supply features overcurrent, leakage, overvoltage, undervoltage, and short-circuit protection. The leakage protector provides overcurrent and leakage protection for the main power circuit and serves as a power cutoff switch during maintenance. It is a 2-pole, 2A design with a leakage current of 30mA. The relay is used for system power switching and automatic / manual pressure adjustment. The switching power supply powers the control panel, sensors, solenoid valves, and relays, with an output power of 150W and an input voltage range of 175V to 264V at 50Hz / 60Hz. It is shielded to prevent electromagnetic radiation from interfering with the control system. The servo drive controls the speed of the oil pump motor. The power cable, used for external power supply, is a three-core, 3×1.0mm² cable with a length of 20m.

[0086] Reference Figure 10 As shown, the control and display unit utilizes a control panel with an independently developed embedded single-chip microcomputer control system, achieving integrated mechatronic, hydraulic, and automatic control. It features a high-brightness LCD display with built-in touch functionality, and utilizes a professionally developed user interface for human-computer interaction. The control panel includes 8-bit AD analog input channels (0-5V input), 4-bit DA analog output channels (0-10V output), 8-bit DI digital input channels, and 8-bit DO digital output channels. It is powered by 24VDC and features both an RS485 and an RS232 communication interface for communication and control with a lower-level computer.

[0087] Working principle: The control system of the device adopts a single-chip microcomputer control panel, equipped with a high-brightness LCD (with touch function) to display the operation interface. It is realized through dedicated software. The control panel monitors the pressure and temperature parameters of the device in real time through the integrated AD analog input channel, and monitors the oil filter status through the DI switch input channel. After the system data information is processed, the data is displayed on the operation interface. The user realizes human-computer interaction through the operation interface on the display screen. The system performs data analysis through the feedback of the interface operation command, controls the start and stop of the vacuum pump and motor pump and the motor speed, thereby realizing the refueling, circulation cleaning / purification functions of the device purification tank (see Figure 10 ).

[0088] The device has power indication, pressure, vacuum, oil temperature, liquid level, oil filter status and other parameter displays, as well as oil filter blockage alarm, system overpressure protection, ultra-vacuum protection, oil overtemperature protection, oil tank low liquid level protection, power overcurrent, over (under) voltage protection, and fault alarm functions, and operates safely and reliably.

[0089] During the operation of the equipment, the control system monitors the outlet pressure, temperature, vacuum degree, liquid level, and oil filter working status; when the oil filter element is blocked, "Replace filter element" is displayed and flashes, prompting the user to replace the filter element; when the pressure reaches the set value, the device automatically stops and alerts the user; when the temperature reaches the set value, the device automatically stops and alerts the user; when the liquid level reaches the set value, the device automatically stops and alerts the user; when the vacuum degree reaches the set value, the device automatically stops and alerts the user.

[0090] Based on the above embodiment, the advantages of the oil dewatering device of the present invention are analyzed as follows:

[0091] 1. Reliability design

[0092] 1.1 The device adopts the electromechanical and hydraulic integration technology controlled by single chip microcomputer, which is the mature technology of the company. The power matching of the power system has been calculated in detail. The selected devices are all brands used in the company's batch production products. Among them, more than 95% of the devices are mature devices used in the company's batch production products. The reliability of the main components used in the device can meet the requirements of reliability design.

[0093] 1.2 During the design process, attention should be paid to the reliability design of the device, and reliability analysis and design should be carried out strictly, including reliability allocation, prediction, use of high-reliability components, redundancy design, derating design and mature technology design measures. Mature technology should be used for key components to ensure product reliability.

[0094] 1.3 The device analyzes the common failure modes, weak links and factors affecting reliability of the company's similar mature equipment, and formulates corresponding measures for the weak links during the device development process to improve product reliability.

[0095] 1.4 The device has a redundant design for key systems that affect product safety. A pressure transmitter is installed on the oil supply pipeline to monitor the system oil supply pressure. When the pressure exceeds the set value, the pressure supply is automatically stopped and the user is prompted.

[0096] 1.5 The device has intelligent control capabilities. Pressure transmitters, temperature sensors, absolute pressure transmitters, differential pressure transmitters, and filter element alarms are set in the hydraulic system of the device to monitor the system working pressure, oil temperature, vacuum, liquid level, and oil filter element status. When the pressure, oil temperature, or vacuum is greater than the set value, the liquid level is low, or the filter element is clogged, the equipment will automatically stop supplying pressure and alert the user through the display screen.

[0097] 1.6 The body structure of the device adopts the surface painting process, the hydraulic conduit adopts aviation stainless steel conduit, and the pipe joints are made of high-quality steel materials. The selected components can avoid damage and strength reduction caused by climate, corrosion, wear and tear, etc.

[0098] 1.7 There should be enough space between all the moving parts and relatively moving parts of the device so that the deformation of the structure will not affect its movement. For example, measures such as keeping a gap of at least 5mm between the conduits can effectively avoid wear and jamming between components.

[0099] 1.8 All detachable parts and interconnected non-moving structures of the device are connected by bolts, and anti-loosening measures are taken to ensure that the connection is firm and reliable.

[0100] 1.9 The device design avoids problems such as sudden stiffness changes, sharp corners, sharp edges, and low surface finish, reducing factors that may cause stress concentration.

[0101] 1.10 The device structure has sufficient clearance under static, thermal and dynamic conditions to prevent mechanical jamming, abrasion or other accidents.

[0102] 1.11 The door covers of the vehicle bodies are equipped with water retaining lines and drainage points, and sealing strips are installed to prevent water accumulation and ice from hindering the operation of the mechanism.

[0103] 1.12 All seals in the hydraulic system of the device are made of nitrile rubber and fluororubber materials with good environmental adaptability to avoid leakage caused by reduced mechanical properties of the seals.

[0104] 1.13 The electrical system of the device shall be equipped with leakage protectors and circuit breakers for leakage, overcurrent and short circuit, and the selected inverter and power supply shall be equipped with overcurrent and over-voltage and under-voltage protection.

[0105] 1.14 All instrument sensors are installed inside the vehicle body.

[0106] 1.15 The grounding of the device signal and power circuit are independent loops, and provide effective shielding for the signal to avoid the influence of electromagnetic interference, or reduce its influence to an acceptable level, and protect personnel from electrical damage.

[0107] 1.16 The main vibration of the device is the motor oil pump. A shock-absorbing rubber pad is placed under the motor installation, and rubber hoses are used at the inlet and outlet of the oil pump to eliminate harmful vibrations.

[0108] 2. Maintainability design

[0109] 2.1 Carry out maintainability design in accordance with the requirements of GJB 368B "General Requirements for Equipment Maintainability" and GJB Z91 "Maintenance Design Technical Manual", simplify and merge functions, eliminate unnecessary or even minor functions, combine the same or similar functions together, make products and maintenance operations, parts and components of the same model interchangeable, reduce devices as much as possible, and ensure the space required for maintenance in the device layout to facilitate the installation, disassembly and maintenance of the equipment, thereby reducing the maintenance content and difficulty; mechanical and electrical interfaces adopt error-proof measures, and the machine interface is marked to meet the ergonomic design for field use.

[0110] 2.2 The device has intelligent control capabilities and is equipped with fault alarm prompts such as oil filter element blockage, system overpressure, ultra-vacuum, overtemperature, low liquid level, and inverter status, which improves the accuracy and efficiency of fault detection and diagnosis.

[0111] 2.3 A leakage protector is installed in the electrical system to protect the circuit from short circuit, overcurrent, leakage and to shut down the power supply during maintenance. The selected inverter has over (under) voltage, overcurrent and phase loss protection functions, which improves the safety of maintenance.

[0112] 2.4 The instruments and meters used during maintenance are all general instruments and tools.

[0113] 2.5 The components used in the device require no or very little preventive maintenance to reduce the content and frequency of maintenance.

[0114] 2.6 Under the specified operating conditions, the device only needs to be repaired and repaired, and the performance parameters such as the opening pressure of the safety valve and other performance parameters need to be measured and adjusted. No major repairs are required.

[0115] 2.7 The device identification plate is set in a position that is easy for maintenance personnel to observe. The identification is screen-printed and the plate is hung to ensure that it will not fall off or fade during the product renovation period.

[0116] The 2.8 device consists of five functional modules: vehicle body structure, hydraulic power source unit, vacuum purification unit, electrical unit, and display control unit.

[0117] 2.9 The frequently used parts of the device are located on the operation panel or at the corresponding position with a movable door cover, which can be opened conveniently. The inspection points, test points, inspection windows, etc. are arranged in easily accessible positions.

[0118] 2.10 The switch of the device is arranged near the door cover and a movable door cover is provided at the corresponding position for good accessibility.

[0119] 2.11 The device is placed at different accessible locations based on the frequency of component failures, difficulty of adjustment, weight, etc., to ensure that components with high failure frequency and frequent preventive maintenance have good accessibility and provide necessary maintenance space.

[0120] 2.12 All parts of the device that are susceptible to damage and cannot be repaired are detachable assemblies, and use connectors that are easy to disassemble quickly (such as threaded installation and pipe joint installation) to facilitate quick replacement and repair.

[0121] 2.13 Parts and components of the same model and function in the device are interchangeable.

[0122] 2.14 The device shall adopt standardized design and use standardized equipment, accessories, and parts. Standard components and parts shall be used. If suitable standard parts are not available at the moment, non-standard parts may be designed based on the interfaces of standard parts to provide conditions for the future use of standard parts.

[0123] 2.15 For operating devices with fixed operating procedures, there are markings of operation sequence numbers and movement directions (such as switch direction, direction of voltage regulating knob, etc.).

[0124] 2.16 The device adopts error-proof design to ensure the correct installation of directional accessories and to ensure that accessories with similar appearance but different functions cannot be installed in series.

[0125] 2.17 The device should indicate the flow direction on the fluid accessories (such as one-way valves, safety valves, etc.) to prevent reverse installation.

[0126] 2.18 The device adopts an error-proof design to ensure that important equipment or parts cannot be installed incorrectly.

[0127] 2.19 The device adopts error-proof design to prevent errors during connection and assembly. Even if an operational error occurs, it can be discovered immediately to avoid consequences such as damage to the device and accidents.

[0128] 2.20 The electrical, hydraulic, mechanical and other connections of adjacent products in the device are equipped with physical error-proofing measures to prevent the two from being interchanged or installed incorrectly.

[0129] 2.21 The oil filter and filter element can be easily disassembled and assembled without draining the oil in the system and oil tank.

[0130] 2.22 The operation interface is equipped with a help button with built-in operating procedures, precautions and troubleshooting methods for common faults, etc., so that the operator can get help at any time; when the operator is working, there will be prompts for each step of the operation to prompt the user to operate and confirm, and repeated confirmation is required before important instructions are entered; with reference to ergonomic design, the operation design is simplified to minimize the operator's workload, facilitate the user's operation, and provide sufficiently clear and specific prompts during operation to minimize the operator's skill requirements.

[0131] 3. Testability Design

[0132] 3.1 Carry out product testability design and analysis in accordance with GJB 2547-2012 "General Requirements for Equipment Testability Failures" and GJB 5188-2003 "General Technical Requirements for Aircraft Ground Automatic Test Equipment".

[0133] 3.2 The device is equipped with relatively complete built-in testing technology and has the function of self-detection upon startup, which can complete its own confidence test, fault isolation and verification test.

[0134] 3.3 The device adopts a single-chip microcomputer control system, and monitoring displays of pressure, temperature, oil filter and oil tank liquid level status are set in the system. When the oil filter is blocked, the oil tank is short of oil, and the system's working pressure and temperature exceed the set values, the equipment will shut down and warn the user.

[0135] 3.4 The device has power supply over (under) voltage, over current, phase loss and leakage protection prompt functions.

[0136] 3.5 The types and number of inspection points should be able to meet the needs of repair organizations at all levels. Their layout should be conducive to testing, and they should be concentrated or zoned as much as possible, and have good accessibility.

[0137] 3.6 The selection of test points should be in accordance with the principle of in-situ testing, and their arrangement should be conducive to testing in a logical sequence.

[0138] 3.7 The markings of the inspection points should be eye-catching, and nameplates and silk-screen logos should be used as markings.

[0139] 3.8 The device has software and hardware interfaces to facilitate regular inspection and on-site calibration of the equipment; all transmitters used are located in convenient locations for disassembly and assembly, making them easy to disassemble for inspection or calibration.

[0140] 4. Security Design

[0141] 4.1 The device design provides maximum safety and convenience for the installation, disassembly, transportation, maintenance, operation, storage and custody of the equipment, and complies with the relevant provisions of GJB 900A "General Requirements for Equipment Safety Work".

[0142] 4.2 Security Design

[0143] In order to achieve the goal of equipment safety design, and in combination with the specific conditions of the equipment, and referring to the relevant provisions of GJB900A, the equipment adopts safety design, which is divided into mechanical system safety design, electrical control system safety design, power supply protection, error prevention, software safety design, etc., to avoid unacceptable accident risks.

[0144] 4.2.1 Mechanical system safety design reduces potential safety hazards to equipment operators, maintenance personnel, and protected objects caused by mechanical failures through material selection, structural design, joint connection design, and operation control design. Measures include:

[0145] a) Select high-quality processing materials to ensure the strength, stability and safety of the equipment structure;

[0146] b) Error-proof and safety design of mechanical joints;

[0147] c) The control operation design is easy to use, with prompts for operation steps and a design to prevent misoperation;

[0148] d) The sharp edges of the device should be rounded to prevent scratches and bumps;

[0149] e) All moving parts are protected to prevent injuries from occurring due to improper operation.

[0150] 4.2.2 Safety design of electrical control system reduces the potential safety hazards caused by electrical faults to equipment operators, maintenance personnel and protected objects by combining grounding and automatic protection with the electrical characteristics of the equipment. Measures include:

[0151] a) All metal parts, panels, control boxes and shielding layers of the equipment are reliably grounded under normal working conditions. A grounding wire is installed at the rear of the vehicle body and marked with a grounding mark;

[0152] b) The equipment uses standard 220V single-phase mains electricity and a three-wire electrical connection in the power supply circuit. In other words, in addition to the working zero, a protective neutral wire is also provided, and the vehicle casing is grounded to prevent safety issues related to leakage. The leakage protector used in the electrical system has short-circuit, overcurrent, and leakage automatic tripping protection functions to prevent chain reaction failures of components.

[0153] 4.2.3 Power supply protection design measures include:

[0154] a) The power supply should be an industrial-grade switching power supply with overvoltage and overcurrent protection functions. At the same time, it has shielding measures to prevent electromagnetic radiation and other functions to ensure that the safety of the equipment itself will not be affected when the external power supply is abnormal;

[0155] b) When an electrical plug (socket) with an anti-misinsertion design is separated, the pins are not electrified.

[0156] 4.2.4 Error-proof design Marked by unique interface design, reduce the risk of human error, measures include:

[0157] a) Full consideration of the selection and installation position of the connector, to avoid installation errors;

[0158] b) Each module of the device has a clear mark to prevent incorrect installation.

[0159] 4.2.5 Software safety design measures include:

[0160] a) Use safe and reliable data backup to prevent user data loss.

[0161] 4.2.6 Set pressure transmitter, temperature sensor, absolute pressure transmitter, differential pressure transmitter, filter alarm monitoring system in the hydraulic system of the device to monitor system working pressure, oil temperature, vacuum, liquid level, oil filter status, when the pressure, oil temperature, vacuum, low liquid level, filter clogging, stop alarm to prevent damage to the aircraft hydraulic system components.

[0162] 4.2.7 Set safety valve in the oil supply line of the hydraulic system of the device to protect the system pressure to prevent damage to the aircraft hydraulic system components.

[0163] 4.2.8 Serious safety equipment, machine parts have automatic protection measures, when a component or device fails, it will not cause harm to personnel and damage to other equipment, machine parts, and the consequences will be damaged. The system, machine parts that are prone to serious consequences, such as proportional valves and other critical equipment and systems, are located in areas that are not easily damaged.

[0164] 4.2.9 The device hydraulic system is equipped with high-precision oil filter and self-cleaning measures to ensure that the aircraft hydraulic system is not contaminated.

[0165] 4.2.10 With oil filter clogging alarm, when the oil filter element is clogged, the device stops working and the display screen prompts the user to "XX oil filter element is clogged, please replace XX oil filter element." At the same time, the oil filter status bar displays "replace filter XX" and flashes red.

[0166] 4.2.11 The device uses single-chip microcomputer controlled configuration Chinese interface to monitor the device running state (pressure, temperature, vacuum, liquid level, oil filter element status) in real time. The design meets the humanized features, with operation buttons, function selection, digital display, and alarm display. Each step of operation has corresponding operation prompts. When the pressure, temperature, vacuum, liquid level, and oil filter reach the alarm value, the device automatically protects and stops working with alarm prompts.

[0167] 4.2.12 The device shall isolate hazardous items, components and operations from other operations, areas, personnel and materials.

[0168] 4.2.13 Potentially dangerous parts of the device shall be marked with eye-catching signs, symbols and text warnings, such as the silk-screen high voltage danger sign on the electrical control part, to prevent accidents and endanger the safety of personnel and equipment.

[0169] 4.2.14 The equipment's "Operation and Maintenance Manual" and "Simple Operation Methods and Precautions" shall specify the requirements for regular inspection and oil cleaning of the equipment. At the same time, the "Operation and Maintenance Manual" shall specify the specific requirements for oil testing and put forward safety-related precautions.

[0170] 4.2.15 All safety-related parts shall be listed as precautions in the equipment's "Operation and Maintenance Manual" and "Simple Operation Methods and Precautions".

[0171] 4.2.16 Place safety operation warning signs and operation procedure instruction plates in obvious locations to remind operators to follow the prescribed procedures.

[0172] 5. Security design

[0173] 5.1 In accordance with the requirements of device design supportability, emphasis is placed on the ability to perform missions without failure and rapid maintenance capabilities. From the outset of the device design, emphasis has been placed on comprehensive supportability, with supportability being considered a design consideration on an equal footing with performance, schedule, and cost. It is emphasized that comprehensive supportability must influence product design, and that optimized comprehensive support plans are developed through comprehensive support activities involving supportability analysis to reduce device operation and support costs.

[0174] 5.2 Common tools, instruments, meters and equipment are used for device inspection and maintenance.

[0175] 5.3 The device uses an 8″ high-brightness, wide-temperature LCD screen with touch function to display the operation interface, which can be clearly seen in strong and weak light conditions. Temperature transmitters and pressure transmitters are used to monitor the temperature and pressure of the system, which can be displayed in real time on the operation interface.

[0176] 5.4 The docking interface between the device and the hydraulic universal adapter can be connected quickly, easily, safely, reliably and accurately.

[0177] 5.5 The equipment can be measured using commonly used standard measuring instruments, eliminating the need for dedicated measurement equipment. The pressure and temperature sensors used in the equipment are calibrated by a nationally recognized third-party metrology institute before leaving the factory. The calibration certificate issued is delivered with the equipment and is marked with a measurement confirmation mark to indicate that it meets the requirements for use. The measurement methods and precautions for the equipment sensors will be clearly stated in the operating and maintenance instructions delivered with the equipment.

[0178] 6. Environmental adaptability

[0179] 6.1 Low temperature

[0180] Low temperature environment is taken into consideration in structural design and component selection. The selected components are used in other mature products. Automatic heating control is set for components with poor low temperature adaptability (such as display screens) to improve their low temperature adaptability. Similar products have undergone low temperature storage and working tests in accordance with the requirements of GJB150.4A-2009. Therefore, it can be ensured that the equipment can perform normally under the environmental conditions of the specified low temperature storage temperature (-55℃) and can work normally under the environmental conditions of the low temperature working temperature (-40℃).

[0181] 6.2 High Temperature

[0182] High temperature environment is taken into consideration in the structural design and component selection. The selected components are used in other mature products. Cooling fans are installed for high-heat components to dissipate heat and improve their high-temperature adaptability. Similar products have undergone high-temperature storage and working tests in accordance with the requirements of GJB150.3A-2009. Therefore, it can be ensured that the equipment can perform normally under the environmental conditions of the specified high-temperature storage temperature (+70℃) and can work normally under the environmental conditions of the high-temperature working temperature (+55℃).

[0183] 6.3 Damp Heat

[0184] The structural design and component selection take damp and hot environments into consideration, ensuring that components and structural parts do not undergo plastic deformation at low temperatures. The equipment features a robust temperature control system, ensuring normal operation at high temperatures. Similar products have undergone damp heat testing in accordance with GJB150.9A-2009, ensuring the device can operate normally in environments with a relative humidity of no more than 95%.

[0185] 6.4 Mold

[0186] During the equipment design process, anti-mildew design was taken into consideration. The chamfering process was used in the structural design to avoid the formation of dead corners. The surface treatment adopted the wear-resistant paint process to improve its mildew resistance. Mildew-resistant electrical components were selected and passed the "three-proof" treatment. Similar products have been mildew tested according to the requirements of GJB150.10A-2009. Therefore, it can be ensured that the device can withstand mildew erosion of a level not inferior to level 2, will not suffer physical damage, and can work normally.

[0187] 6.5 Salt spray

[0188] The surface of the vehicle body is painted with wear-resistant paint to enhance its resistance to corrosion and salt spray. The electrical components are selected to be resistant to salt spray corrosion and have undergone "three-proof" treatment. Similar products have undergone salt spray testing according to the requirements of GJB150.11A-2009, so it can be ensured that the device can be used normally in salt spray environment.

[0189] 6.6 Transport vibration

[0190] The vibration environment is taken into consideration during the design. Shock-absorbing mechanisms are installed between the front and rear wheels and the vehicle body. Vibration-reducing measures are adopted for the main components of the equipment (motor, electrical box). Anti-loosening measures such as anti-loosening nuts are used for fasteners and cotter pins are added to movable parts. Similar products have been tested in accordance with the requirements of GJB150.16A-2009, so it can be ensured that the device can withstand the vibration environment induced during transportation by road, rail, water, air, etc.

[0191] 6.7 Rain

[0192] The vehicle features a box-type, internally concealed mechanical structure. The vehicle's upper cover, display screen dust cover, and door covers are equipped with water-retaining lines and sealing strips. A protective cover is also included for use during off-peak hours, protecting the entire unit and providing excellent rainproofing. The vehicle's surface is finished with a wear-resistant paint finish, and the device can withstand rainfall intensity of 1.7 mm / min and operate normally.

[0193] Although the embodiments of the present invention have been shown and described above, it will be understood that the above embodiments are illustrative and are not to be construed as limitations on the present invention. A person skilled in the art may change, modify, replace and modify the above embodiments within the scope of the present invention without departing from the principles and purpose of the present invention.

Claims

1. An oil dewatering device for a hydraulic system, characterized by: It includes a vehicle body structure and a hydraulic power source unit, a vacuum purification unit, an electrical unit, and a display control unit mounted thereon; The hydraulic power source unit is connected to other units, including a purification tank and a purification pipeline system and a refueling pipeline system connected thereto. The purification pipeline system includes an input pipeline and an output pipeline connected between the external hydraulic equipment and the purification tank, and cooperates with the vacuum purification unit to achieve water removal and purification of the oil of the external hydraulic equipment; the refueling pipeline system is connected between the oil barrel and the purification tank, and is used to refuel the purification tank; The vacuum purification unit is used to provide vacuum conditions to separate water, air and impurities from the oil in the purification tank, and to carry away and discharge the separated gaseous substances through a dry airflow; The electrical unit is used for power supply and circuit protection of the entire device; The display control unit is used to control and display the operation and status of the entire device to achieve human-computer interaction; The vehicle body structure includes four load-bearing wheels and a semi-enclosed vehicle body. An electrical control cabinet accommodating an electrical unit is arranged at the front of the interior of the vehicle body, and a display control unit is installed on the upper part of the electrical control cabinet; a pushing handle is arranged at the front end of the exterior of the vehicle body; ventilation shutters are arranged at the front end of the vehicle body, and ventilation movable doors are arranged at the rear end for ventilation and heat dissipation of the entire vehicle, and the left and right sides are movable door covers; water retaining lines are arranged at the joints of the door covers of the vehicle body, and sealing strips are installed, and the entire vehicle is waterproofed.

2. The oil dewatering device for a hydraulic system according to claim 1, characterized in that: The four corners of the chassis of the vehicle body are provided with lifting and mooring structures.

3. The oil dewatering device for a hydraulic system according to claim 2, characterized in that: The purification tank is equipped with a differential pressure transmitter and an absolute pressure transmitter. The differential pressure transmitter is used to monitor the liquid level in the tank. When the liquid level exceeds the set value, the system will stop and prompt the user; the absolute pressure transmitter is used to monitor the vacuum degree in the tank. When the vacuum degree exceeds the set value, the system will stop and prompt the user.

4. The oil dewatering device for a hydraulic system according to claim 3, characterized in that: The purification pipeline system is connected to the external hydraulic equipment through a quick connector. A back pressure valve is provided on the input pipeline connecting the external hydraulic equipment and the purification tank, and the flow rate of oil flowing into the purification tank is controlled by the back pressure valve; the output pipeline between the purification tank and the external hydraulic equipment is sequentially provided with a gear pump, a one-way valve, an oil filter, a pressure transmitter, a temperature transmitter, a pressure regulating stop valve, a sampling valve, and a safety valve. The purified oil is pumped out by the gear pump, and the gear pump is protected by the one-way valve. The pressure and temperature of the oil in the pipeline are monitored by the pressure transmitter and the temperature transmitter. The pressure of the oil in the pipeline is adjusted by the pressure regulating stop valve. The oil in the pipeline is sampled by the sampling valve for offline contamination detection.

5. The oil dewatering device for a hydraulic system according to claim 4, characterized in that: The refueling pipeline system is connected to the output pipeline of the purification pipeline system through a reversing valve. A refueling filter and a refueling stop valve are arranged along the pipeline in sequence. The reversing valve is switched to the refueling position, the refueling stop valve and the pressure regulating stop valve are opened, and the motor is started to drive the gear pump to complete the refueling of the purification tank.

6. The oil dewatering device for a hydraulic system according to claim 5, characterized in that: The vacuum purification unit includes a vacuum pump and a dry air flow transmission pipeline. The vacuum pump is connected to the purification tank through a pipeline, and an oil-water separator is provided on the pipeline. The dry air flow transmission pipeline connects the air to the purification tank, and a flow regulating valve and an air filter are sequentially provided on the pipeline. Under vacuum conditions, the dry air enters the purification tank through the flow regulating valve and the air filter to separate the water, air, and impurities in the oil inside, and then passes through the oil-water separator and the vacuum pump to discharge the vaporized substances.

7. The oil dewatering device for a hydraulic system according to claim 6, characterized in that: The electrical unit is powered by AC220V / 50Hz and consists of a leakage protector, contactor, servo driver, relay, switching power supply, and power cable. The power supply has overcurrent, leakage, overvoltage, undervoltage, and short circuit protection prompts. The leakage protector is used for overcurrent and leakage protection of the main power supply circuit and as a switch to cut off the power supply during maintenance. It is selected as a 2-pole 2A with a leakage current of 30mA; The relay is used for system power switch and automatic / manual conversion of pressure regulation; The switching power supply is used to power the control panel, sensors, solenoid valves, and relays. It has an output power of 150W and an input voltage range of 175V to 264V at 50Hz / 60Hz. It has shielding measures to prevent electromagnetic radiation from interfering with the control system. The servo driver is used for speed control of the oil pump motor; The power cable is used for external power supply and adopts a three-core cable, 3×1.0 mm2, with a length of 20 m.

8. The oil dewatering device for a hydraulic system according to claim 7, characterized in that: The display control unit includes a control panel and a display operation interface. The control panel monitors the pressure and temperature parameters of the device in real time through the integrated AD analog input channel, monitors the oil filter status through the DI switch input channel, and displays the data on the operation interface after system data information processing; the display operation interface is used to realize human-computer interaction. The device performs data analysis through the feedback of interface operation instructions, controls the start and stop of the vacuum pump and motor pump and the motor speed, thereby realizing the refueling and circulation cleaning / purification functions of the device purification tank.

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