Oil filtering device

Abstract

The invention discloses an oil filtering device which comprises an oil pumping mechanism. The filter mechanism comprises a first filter tank, a filter screen, a second filter tank and a filter element, an inlet of the first filter tank is communicated with an outlet of the oil pumping mechanism, the filter screen is arranged in the first filter tank and used for filtering impurities in hydraulic oil, an inlet of the second filter tank is communicated with an outlet of the first filter tank, and an outlet of the second filter tank is communicated with an outlet of the second filter tank. The filter element is arranged in the second filter tank and is used for demulsification; an inlet of the separation mechanism is communicated with an outlet of the second filter tank, and the separation mechanism is used for oil-water separation and storage.The oil-water separation device has the advantages that through the graded filtering design of a filter screen and a filter element, solid impurities in hydraulic oil can be effectively filtered, the problem of emulsification of the hydraulic oil can be solved, and the oil-water separation effect is improved. The defect that an existing treatment mode cannot comprehensively purify hydraulic oil is overcome, and deep purification of the hydraulic oil is achieved.

Description

Technical Field

[0001] This invention relates to the field of hydraulic technology, and more specifically to an oil filtration device. Background Technology

[0002] Most transport equipment uses hydraulic drive, and hydraulic oil, as the core medium of the hydraulic transmission system, directly determines the operating performance and service life of the hydraulic system; it is the "blood" of the transport equipment's normal operation. Hydraulic oil consumption is enormous; therefore, cost reduction and efficiency improvement, increasing hydraulic oil utilization, and minimizing damage to hydraulic components have become important issues in operation and management.

[0003] During long-term use, hydraulic oil will produce impurities and particles due to the wear of mechanical parts, and it is also prone to emulsification. If the above-mentioned pollution problems are not dealt with in time, it will accelerate the wear and damage of core hydraulic components such as hydraulic pumps, hydraulic motors, and hydraulic valve groups, significantly shorten the service life of hydraulic components, and increase equipment operation and maintenance costs.

[0004] There are two main methods used in the industry to deal with hydraulic oil contamination: one is to directly replace the hydraulic oil and clean the hydraulic system; the other is to filter the hydraulic oil and clean the hydraulic system. Both methods are not only costly but also have limited filtration effectiveness, failing to fully resolve the hydraulic oil emulsification problem and hindering the efficient reuse of hydraulic oil. They also fail to meet the actual needs of cost reduction, efficiency improvement, and increased hydraulic oil utilization.

[0005] Existing hydraulic oil filters can only filter impurities and cannot comprehensively address hydraulic oil emulsification issues, thus failing to meet the contamination treatment requirements of hydraulic oil in transport and erection equipment. Therefore, developing an oil filtration device that can simultaneously filter impurities, demulsify and remove water, while also being low-cost, highly efficient, and with high filtration accuracy, has become an urgent need to solve these problems. Summary of the Invention

[0006] The purpose of this invention is to overcome the above-mentioned technical deficiencies and propose an oil filtration device to solve the technical problem that the existing technology cannot fully solve the problem of hydraulic oil emulsification and is difficult to achieve efficient reuse of hydraulic oil.

[0007] To achieve the above-mentioned technical objectives, the present invention provides an oil filtration device, including an oil pumping mechanism; A filtration mechanism, comprising a first filter tank, a filter screen, a second filter tank, and a filter element, wherein the inlet of the first filter tank communicates with the outlet of the oil extraction mechanism, the filter screen is disposed in the first filter tank and is used to filter impurities in the hydraulic oil, the inlet of the second filter tank communicates with the outlet of the first filter tank, and the filter element is disposed in the second filter tank and is used for demulsification; and, The separation mechanism has an inlet that is connected to the outlet of the second filter tank, and is used for oil-water separation and storage.

[0008] In some embodiments, the oil extraction mechanism includes a vacuum tank, an oil inlet pipe, and a vacuum motor. The inlet of the oil inlet pipe is connected to the outlet of the oil circuit system of the equipment to be cleaned, the outlet of the oil inlet pipe is connected to the inlet of the vacuum tank, the outlet of the vacuum tank is connected to the inlet of the first filter tank, and the vacuum motor is connected to the vacuum tank.

[0009] In some embodiments, the oil extraction mechanism further includes an observation window disposed on the vacuum tank.

[0010] In some embodiments, the oil extraction mechanism further includes a heating assembly, which includes a heating sleeve connected to the outside of the oil inlet pipe and abutting against the oil inlet pipe.

[0011] In some embodiments, the heating assembly further includes a heating ring connected to the inside of the oil inlet pipe, and the heating ring has a plurality of through holes for hydraulic oil to pass through.

[0012] In some embodiments, the heating assembly further includes an impeller, the heating ring is rotatably connected to the inside of the oil inlet pipe, and the impeller is connected to the heating ring.

[0013] In some embodiments, the separation mechanism includes an oil drain pipe, a moisture sensor, a separation pump, a drain pipe, a solenoid valve, and an oil storage tank. The inlet of the drain pipe is connected to the drain hole at the bottom of the second filter tank. The solenoid valve is located on the drain pipe. The inlet of the oil drain pipe is connected to the oil drain hole on the second filter tank. The outlet of the oil drain pipe is connected to the inlet of the oil storage tank. The separation pump and the moisture sensor are both located on the oil drain pipe.

[0014] In some embodiments, the separation mechanism further includes a hose, a buoyancy tube, and a buoyancy block. The buoyancy tube is slidably connected to the second filter tank along the height direction of the second filter tank. The buoyancy block is connected to the buoyancy tube. The buoyancy block causes the inlet of the buoyancy tube to float above the normal hydraulic oil in the second filter tank. The outlet of the buoyancy tube is connected to the inlet of the hose, and the outlet of the hose is connected to the inlet of the drain pipe.

[0015] In some embodiments, the separation mechanism further includes a reflux assembly, which includes a three-way valve, a reflux pipe, and a reflux pump. The inlet of the three-way valve is connected to the inlet of the oil drain pipe, the first outlet of the three-way valve is connected to the inlet of the separation pump, the second outlet of the three-way valve is connected to the inlet of the reflux pipe, the outlet of the reflux pipe is connected to the inlet of the oil inlet pipe, and the reflux pump is located in the reflux pipe.

[0016] In some embodiments, the oil filtration device further includes a mobile vehicle, and the oil extraction mechanism, the filtration mechanism, and the separation mechanism are all located on the mobile vehicle.

[0017] Compared with the prior art, the beneficial effects of the present invention include: Through the graded filtration design of filter screen and filter element, it can effectively filter solid impurities in hydraulic oil and solve the problem of hydraulic oil emulsification, thus overcoming the shortcomings of existing treatment methods that cannot fully purify hydraulic oil and achieving deep purification of hydraulic oil. Compared to the two high-cost methods of directly replacing hydraulic oil and outsourcing filtration and cleaning, this device can directly purify and regenerate contaminated hydraulic oil without replacing it with new hydraulic oil or outsourcing the treatment. This significantly reduces the procurement and maintenance costs of hydraulic oil per unit and meets the actual needs of improving hydraulic oil utilization. The hydraulic oil purified by this device has impurities and moisture removed, restoring its original performance. It can be reused in the oil circuit system of the equipment to be cleaned without replacing all the hydraulic oil. At the same time, the purified hydraulic oil can reduce wear on hydraulic components, extend the service life of hydraulic pumps, hydraulic motors and other components, and reduce equipment failure rate and overhaul costs. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall structure of the oil filtration device provided by the present invention; Figure 2 This is a cross-sectional view of the overall structure of the oil filtration device provided by the present invention; Figure 3 This invention provides Figure 1 Enlarged view of the local structure at point A; Figure 4 This invention provides Figure 1 Enlarged view of the local structure at point B.

[0019] Explanation of reference numerals in the attached figures: 1. Oil extraction mechanism; 11. Vacuum tank; 12. Oil inlet pipe; 13. Vacuum motor; 14. Observation window; 15. Heating component; 151. Heating jacket; 152. Heating ring; 153. Through hole; 154. Impeller; 2. Filtration mechanism; 21. First filter tank; 22. Filter screen; 23. Second filter tank; 24. Filter element; 3. Separation mechanism; 31. Oil drain pipe; 32. Moisture sensor; 33. Separation pump; 34. Drain pipe; 35. Solenoid valve; 36. Oil storage tank; 37. Hose; 38. Buoyancy pipe; 39. Buoyancy block; 4. Return assembly; 41. Three-way valve; 42. Return pipe; 43. Return pump; 5. Moving cart. Detailed Implementation

[0020] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0021] This invention provides an oil filtration device, the structure of which is as follows: Figure 1 - Figure 4 As shown, it includes an oil pumping mechanism 1; The filtration mechanism 2 includes a first filter canister 21, a filter screen 22, a second filter canister 23, and a filter element 24. The inlet of the first filter canister 21 is connected to the outlet of the oil extraction mechanism 1. The filter screen 22 is disposed in the first filter canister 21 and is used to filter impurities in the hydraulic oil. The inlet of the second filter canister 23 is connected to the outlet of the first filter canister 21. The filter element 24 is disposed in the second filter canister 23 and is used for demulsification. The separation mechanism 3 has an inlet that is connected to the outlet of the second filter tank 23, and is used for oil-water separation and storage.

[0022] During use, the oil extraction mechanism 1 is activated. The oil extraction mechanism 1 extracts contaminated hydraulic oil from the oil circuit system of the equipment to be cleaned through its inlet and delivers the contaminated hydraulic oil to the filtration mechanism 2. The hydraulic oil first enters the first filter tank 21, where the filter screen 22 performs preliminary filtration, accurately intercepting mechanical wear impurities, particulate matter, and other solid contaminants in the hydraulic oil, and removing impurities that affect the lifespan of hydraulic components. After preliminary filtration, the hydraulic oil flows from the outlet of the first filter tank 21 into the second filter tank 23. The filter element 24 in the second filter tank 23 performs demulsification, breaking the molecular chains of the emulsified oil through its own high-molecular-weight active molecules, separating the oil and water in the emulsified state. The hydraulic oil after demulsification enters the separation mechanism 3 from the outlet of the second filter tank 23. The separation mechanism 3 separates the hydraulic oil from the water, stores the separated qualified hydraulic oil, and discharges the separated water, thus completing the purification process of the hydraulic oil and enabling its reuse.

[0023] In this invention, the graded filtration design of filter screen 22 and filter element 24 can effectively filter solid impurities in hydraulic oil and solve the problem of hydraulic oil emulsification, thus overcoming the shortcomings of existing treatment methods that cannot fully purify hydraulic oil and achieving deep purification of hydraulic oil.

[0024] Compared to the two existing high-cost methods of directly replacing hydraulic oil and outsourcing filtration and cleaning, this device can directly purify and regenerate contaminated hydraulic oil without replacing it with new hydraulic oil or outsourcing the treatment. This significantly reduces the procurement and maintenance costs of hydraulic oil per unit and meets the actual needs of improving hydraulic oil utilization.

[0025] The hydraulic oil purified by this device has impurities and moisture removed, restoring its original performance. It can be reused in the oil circuit system of the equipment to be cleaned without replacing all the hydraulic oil. At the same time, the purified hydraulic oil can reduce wear on hydraulic components, extend the service life of hydraulic pumps, hydraulic motors and other components, and reduce equipment failure rate and overhaul costs.

[0026] To perform the oil extraction process, please refer to... Figure 1 In a preferred embodiment, the oil extraction mechanism 1 includes a vacuum tank 11, an oil inlet pipe 12, and a vacuum motor 13. The inlet of the oil inlet pipe 12 is connected to the outlet of the oil circuit system of the equipment to be cleaned, the outlet of the oil inlet pipe 12 is connected to the inlet of the vacuum tank 11, the outlet of the vacuum tank 11 is connected to the inlet of the first filter tank 21, and the vacuum motor 13 is connected to the vacuum tank 11.

[0027] During use, the vacuum motor 13 operates and evacuates the vacuum tank 11, creating a negative pressure environment inside the vacuum tank 11. Under the negative pressure, the contaminated hydraulic oil in the oil circuit system of the equipment to be cleaned is drawn into the vacuum tank 11 through the oil inlet pipe 12 and transported from the outlet of the vacuum tank 11 to the inlet of the first filter tank 21, thus realizing the stable delivery of hydraulic oil from the equipment oil circuit system to the filter mechanism 2.

[0028] For easier observation of the conditions inside vacuum chamber 11, please refer to... Figure 1 In a preferred embodiment, the oil extraction mechanism 1 further includes an observation window 14, which is disposed on the vacuum tank 11.

[0029] During use, by setting an observation window 14 on the vacuum tank 11, the operator can observe the oil level, oil inlet status and flow of the hydraulic oil in the vacuum tank 11 in real time, and judge in time whether the oil pumping mechanism 1 is working properly, so as to avoid abnormal conditions such as empty suction, oil shortage or oil overflow, and improve the stability and safety of the device operation.

[0030] To reduce the viscosity of hydraulic oil, please refer to... Figure 2 In a preferred embodiment, the oil extraction mechanism 1 further includes a heating component 15, which includes a heating sleeve 151 connected to the outside of the oil inlet pipe 12 and abutting against the oil inlet pipe 12.

[0031] During use, when the oil extraction mechanism 1 is running, the vacuum motor 13 draws air from the inside of the vacuum tank 11 to create a negative pressure environment, which drives the contaminated and emulsified hydraulic oil in the oil circuit system of the equipment to be cleaned to flow into the vacuum tank 11 through the oil inlet pipe 12. At this time, the heating jacket 151, which is tightly connected to and abuts against the outside of the oil inlet pipe 12, starts to work. The heat generated by the heating jacket 151 is evenly transferred to the pipe wall of the oil inlet pipe 12 through the gapless contact surface with the outer wall of the oil inlet pipe 12 in a stable heat conduction manner, and then continuously and evenly transferred to the hydraulic oil to be treated flowing throughout the oil inlet pipe 12. Through the above heating process, on the one hand, the kinematic viscosity of the hydraulic oil to be treated can be significantly reduced, greatly reducing the flow resistance of the hydraulic oil in the oil inlet pipe 12. This avoids problems such as reduced negative pressure suction efficiency, poor oil inlet, and pipeline blockage caused by oil viscosity, ensuring the stability and continuity of vacuum negative pressure suction, ensuring that the hydraulic oil enters the vacuum tank 11 smoothly and in sufficient quantity, and improving the working reliability and operating efficiency of the oil pumping mechanism 1. On the other hand, the hydraulic oil to be treated can be preheated in advance, so that the oil temperature reaches the optimal working temperature range suitable for subsequent filtration and demulsification processes, creating favorable conditions for the demulsification treatment of the filter element 24 in the second filter tank.

[0032] To improve heating performance, please refer to... Figure 3 In a preferred embodiment, the heating assembly 15 further includes a heating ring 152, which is connected to the inside of the oil inlet pipe 12 and has a plurality of through holes 153 for hydraulic oil to pass through.

[0033] During use, while the heating assembly 15 is working, the outer heating sleeve 151 indirectly heats the oil through the pipe wall, and the heating ring 152, which is fixedly connected to the inner side of the oil inlet pipe 12, starts working simultaneously. The heating ring 152 is directly immersed in the hydraulic oil to be treated flowing in the oil inlet pipe 12, forming a direct contact heat exchange with the oil. Compared with the indirect heat conduction of the outer heating sleeve 151, the heat transfer path is greatly shortened, the heating efficiency is significantly improved, and a dual heating system with the heating sleeve 151 is formed, solving the problems of insufficient heating of the oil in the center of the pipe and uneven oil temperature distribution that exist in single outer heating. When hydraulic oil flows through heating ring 152 under vacuum negative pressure suction, it passes through multiple through holes 153 on heating ring 152. On the one hand, the through holes 153 ensure the effective flow cross-sectional area of ​​hydraulic oil, without creating additional resistance to oil flow and without affecting the negative pressure suction efficiency of oil pumping mechanism 1. On the other hand, during the process of hydraulic oil diverting through each through hole 153, the heat exchange contact area with heating ring 152 is greatly increased. At the same time, the diversion and convergence effect formed by the through holes generates slight turbulence in the oil, breaking the laminar flow state of the oil, allowing the oil at different positions in the pipe to fully mix and exchange heat, further eliminating oil temperature deviation, ensuring that the viscosity of the entire oil is uniform and steadily decreases, and effectively avoiding problems such as poor oil intake and pipeline blockage caused by oil viscosity.

[0034] To further improve the heating effect, please refer to Figure 3 In a preferred embodiment, the heating assembly 15 further includes an impeller 154, a heating ring 152 rotatably connected to the inside of the oil inlet pipe 12, and the impeller 154 connected to the heating ring 152.

[0035] During use, the impeller 154 drives the heating ring 152 to rotate synchronously under the impeller's hydraulic oil flow in the oil inlet pipe 12. On the one hand, this causes relative motion between the heating ring 152 and the hydraulic oil, expanding the contact range between them and achieving more uniform and thorough heating, thus avoiding local overheating or insufficient heating. On the other hand, the rotating heating ring 152 and impeller 154 can disturb and disperse the hydraulic oil, further reducing its viscosity and promoting the initial separation of water and oil. This facilitates better demulsification treatment by the subsequent filter element 24, while also reducing the adhesion of viscous oil to the pipe wall, ensuring smooth and stable oil intake, and improving overall filtration efficiency.

[0036] To achieve the separation of hydraulic oil and water, please refer to... Figure 1 In a preferred embodiment, the separation mechanism 3 includes an oil drain pipe 31, a moisture sensor 32, a separation pump 33, a drain pipe 34, a solenoid valve 35, and an oil storage tank 36. The inlet of the drain pipe 34 is connected to the drain hole at the bottom of the second filter tank 23. The solenoid valve 35 is located on the drain pipe 34. The inlet of the oil drain pipe 31 is connected to the oil drain hole on the second filter tank 23. The outlet of the oil drain pipe 31 is connected to the inlet of the oil storage tank 36. The separation pump 33 and the moisture sensor 32 are both located on the oil drain pipe 31.

[0037] During use, the hydraulic oil and water, after demulsification and oil-water separation in the second filter tank 23, naturally separate into layers under gravity, with the water settling at the bottom of the second filter tank 23. The moisture sensor 32 monitors the water content of the hydraulic oil in the drain pipe 31 in real time to determine whether the hydraulic oil is purified to the required standard. When the water content of the hydraulic oil is detected to be within the standard range, the separation pump 33 starts and transports the purified hydraulic oil in the second filter tank 23 to the storage tank 36 through the drain pipe 31 for storage and reuse. The water that has settled at the bottom of the second filter tank 23 enters the drain pipe 34 through the bottom drain hole. The solenoid valve 35 controls the opening and closing of the drain pipe 34 to achieve timed or on-demand discharge of the separated water, thereby completing the complete separation and collection of hydraulic oil and water.

[0038] To further improve the oil-water separation effect, please refer to Figure 4In a preferred embodiment, the separation mechanism 3 further includes a hose 37, a buoyancy tube 38, and a buoyancy block 39. The buoyancy tube 38 is slidably connected to the second filter tank 23 along the height direction of the second filter tank 23. The buoyancy block 39 is connected to the buoyancy tube 38. The buoyancy block 39 causes the inlet of the buoyancy tube 38 to float above the normal hydraulic oil in the second filter tank 23. The outlet of the buoyancy tube 38 is connected to the inlet of the hose 37, and the outlet of the hose 37 is connected to the inlet of the drain pipe 31.

[0039] During use, the buoyancy block 39 generates buoyancy in the hydraulic oil in the second filter tank 23, causing the buoyancy tube 38 to float up and down with the oil level along the height direction of the second filter tank 23. This ensures that the inlet of the buoyancy tube 38 always floats on the upper layer of normal hydraulic oil, preventing the intake of water and impurities separated from the lower layer. The purified upper layer hydraulic oil enters the drain pipe 31 through the buoyancy tube 38 and the hose 37, and is then transported to the storage tank 36 by the separation pump 33. Through the adaptive floating structure of the buoyancy tube 38 with the oil level, only pure hydraulic oil is extracted, without extracting water and sediment, ensuring that the oil entering the drain pipe 31 is clean and water-free, further improving the oil-water separation effect and the quality of the filtered hydraulic oil.

[0040] To achieve closed-loop control of hydraulic oil purification, please refer to... Figure 1 In a preferred embodiment, the separation mechanism 3 further includes a reflux assembly 4, which includes a three-way valve 41, a reflux pipe 42, and a reflux pump 43. The inlet of the three-way valve 41 is connected to the inlet of the oil drain pipe 31, the first outlet of the three-way valve 41 is connected to the inlet of the separation pump 33, the second outlet of the three-way valve 41 is connected to the inlet of the reflux pipe 42, the outlet of the reflux pipe 42 is connected to the inlet of the oil inlet pipe 12, and the reflux pump 43 is located in the reflux pipe 42.

[0041] During use, the moisture sensor 32 at the inlet of the drain pipe 31 detects the water content of the hydraulic oil flowing through it in real time to determine whether the oil is purified to a qualified standard. When the moisture sensor 32 detects that the water content of the hydraulic oil meets the standard, the three-way valve 41 switches to the first outlet, allowing the purified hydraulic oil to enter the separator pump 33 through the three-way valve 41, and then be transported by the separator pump 33 to the oil storage tank 36 for storage, completing the collection of clean oil. When the moisture sensor 32 detects that the water content of the hydraulic oil does not meet the standard, the three-way valve 41 switches to the second outlet, starts the return pump 43, and the hydraulic oil that does not meet the standard enters the return pipe 42 through the three-way valve 41. Under the power of the return pump 43, it is transported through the return pipe 42 to the inlet of the oil inlet pipe 12, and re-enters the oil extraction mechanism 1 and subsequent filtration and demulsification processes for secondary purification treatment.

[0042] For easy relocation of the oil filter unit, please refer to... Figure 1 In a preferred embodiment, the oil filtration device further includes a mobile vehicle 5, and the oil extraction mechanism 1, the filtering mechanism 2, and the separation mechanism 3 are all located on the mobile vehicle 5.

[0043] In use, the oil extraction mechanism 1, the filtration mechanism 2, and the separation mechanism 3 are integrated and mounted on the mobile vehicle 5, making the entire oil filtration device an integrated and mobile structure. This allows for flexible transfer and on-site operation according to the purification needs of different equipment and locations at the construction site, improving the device's mobility and on-site applicability. At the same time, the overall integrated layout is compact and occupies little space, requiring no fixed installation, making operation and transfer more convenient and effectively improving the flexibility and efficiency of hydraulic oil purification operations.

[0044] To better understand this invention, the following is combined with... Figure 1 - Figure 4 The working principle of an oil filtration device according to the present invention is described in detail as follows: The oil extraction mechanism 1 is activated, and the oil extraction mechanism 1 extracts contaminated hydraulic oil from the oil circuit system of the equipment to be cleaned through its inlet, and delivers the contaminated hydraulic oil to the filtration mechanism 2. The hydraulic oil first enters the first filter tank 21, where the filter screen 22 performs preliminary filtration, accurately intercepting mechanical wear impurities, particulate matter, and other solid contaminants in the hydraulic oil, removing impurities that affect the lifespan of hydraulic components. After preliminary filtration, the hydraulic oil flows from the outlet of the first filter tank 21 into the second filter tank 23. The filter element 24 in the second filter tank 23 performs demulsification, breaking the molecular chains of the emulsified oil through its own high-molecular-weight active molecules, separating the oil and water in the emulsified state. After demulsification, the hydraulic oil enters the separation mechanism 3 from the outlet of the second filter tank 23. The separation mechanism 3 separates the hydraulic oil from the water, stores the separated qualified hydraulic oil, and discharges the separated water, ultimately completing the purification process of the hydraulic oil and realizing its reuse.

[0045] The specific embodiments of the present invention described above do not constitute a limitation on the scope of protection of the present invention. Any other corresponding changes and modifications made in accordance with the technical concept of the present invention should be included within the scope of protection of the claims of the present invention.

Claims

1. An oil filtration device, characterized in that, include: Oil extraction mechanism; A filtration mechanism, comprising a first filter tank, a filter screen, a second filter tank, and a filter element, wherein the inlet of the first filter tank communicates with the outlet of the oil extraction mechanism, the filter screen is disposed in the first filter tank and is used to filter impurities in the hydraulic oil, the inlet of the second filter tank communicates with the outlet of the first filter tank, and the filter element is disposed in the second filter tank and is used for demulsification; and, The separation mechanism has an inlet that is connected to the outlet of the second filter tank, and is used for oil-water separation and storage.

2. The oil filtration device according to claim 1, characterized in that, The oil extraction mechanism includes a vacuum tank, an oil inlet pipe, and a vacuum motor. The inlet of the oil inlet pipe is connected to the outlet of the oil circuit system of the equipment to be cleaned, the outlet of the oil inlet pipe is connected to the inlet of the vacuum tank, the outlet of the vacuum tank is connected to the inlet of the first filter tank, and the vacuum motor is connected to the vacuum tank.

3. The oil filtration device according to claim 2, characterized in that, The oil pumping mechanism also includes an observation window, which is located on the vacuum tank.

4. The oil filtration device according to claim 2, characterized in that, The oil extraction mechanism further includes a heating component, which includes a heating sleeve connected to the outside of the oil inlet pipe and abutting against the oil inlet pipe.

5. The oil filtration device according to claim 4, characterized in that, The heating assembly also includes a heating ring connected to the inside of the oil inlet pipe, and the heating ring has multiple through holes for hydraulic oil to pass through.

6. The oil filtration device according to claim 5, characterized in that, The heating assembly also includes an impeller, the heating ring is rotatably connected to the inside of the oil inlet pipe, and the impeller is connected to the heating ring.

7. The oil filtration device according to claim 2, characterized in that, The separation mechanism includes an oil drain pipe, a moisture sensor, a separation pump, a drain pipe, a solenoid valve, and an oil storage tank. The inlet of the drain pipe is connected to the drain hole at the bottom of the second filter tank. The solenoid valve is located on the drain pipe. The inlet of the oil drain pipe is connected to the oil drain hole on the second filter tank. The outlet of the oil drain pipe is connected to the inlet of the oil storage tank. The separation pump and the moisture sensor are both located on the oil drain pipe.

8. The oil filtration device according to claim 7, characterized in that, The separation mechanism further includes a hose, a buoyancy tube, and a buoyancy block. The buoyancy tube is slidably connected to the second filter tank along the height direction of the second filter tank. The buoyancy block is connected to the buoyancy tube. The buoyancy block causes the inlet of the buoyancy tube to float above the normal hydraulic oil in the second filter tank. The outlet of the buoyancy tube is connected to the inlet of the hose, and the outlet of the hose is connected to the inlet of the drain pipe.

9. The oil filtration device according to claim 7, characterized in that, The separation mechanism further includes a reflux assembly, which includes a three-way valve, a reflux pipe, and a reflux pump. The inlet of the three-way valve is connected to the inlet of the oil drain pipe, the first outlet of the three-way valve is connected to the inlet of the separation pump, the second outlet of the three-way valve is connected to the inlet of the reflux pipe, the outlet of the reflux pipe is connected to the inlet of the oil inlet pipe, and the reflux pump is located in the reflux pipe.

10. The oil filtration device according to claim 1, characterized in that, The oil filtration device also includes a mobile vehicle, and the oil extraction mechanism, filtration mechanism and separation mechanism are all located on the mobile vehicle.

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