Oil filter

Abstract

The utility model discloses an oil liquid filter, which relates to the technical field of oil liquid filtration and particularly comprises a shell, a filter element is fixed in an inner cavity of the shell, a connecting pipe is fixedly connected to the middle of the bottom of the inner cavity of the shell, and the bottom end of the filter element is tightly attached to the top end of an inner cavity of the connecting pipe. The bottom end of an inner cavity of the connecting pipe is in threaded connection with an impurity collecting box, an electric door is arranged on the top of the impurity collecting box, a pressure sensor is arranged on the electric door, a sealing cover is fixed to the top of the shell, and a sealing structure and an impurity removing structure are arranged at the bottom of the sealing cover. According to the oil liquid filter, through the arrangement of the impurity removal structure, the filter element can be cleaned in the oil liquid filtering process, the situation that impurities adhere to the filter element to block the filter element is avoided, the filtering efficiency of the filter element is guaranteed, the impurities intercepted by the filter element can be cleaned in the oil liquid filtering process, and the oil liquid filtering efficiency is improved. And the working efficiency of the filter is ensured.

Description

Technical Field

[0001] The utility model relates to the technical field of oil filtration, in particular to an oil filter. Background Technique

[0002] During the mechanical processing process, it is necessary to use processing equipment to perform operations such as turning, milling, boring, and grinding on the workpiece blank to process the metal parts into shape. A large amount of heat and waste chips will be generated during these processes. Therefore, it is necessary to use oil to cool and lubricate the processing equipment and the workpiece, and wash and discharge the generated waste chips to ensure the stable operation of the processing equipment and the accuracy of the workpiece to be processed. The used cooling oil will carry a large amount of metal debris, and before recycling, solid-liquid separation and filtration treatment must be carried out.

[0003] In the prior art, some solutions for filtering oil are disclosed. For example, the oil filter including a hydraulic resistance member disclosed in the authorized patent with the application number 201680051942.X. When this solution is used, the oil filter is used to filter the oil to be filtered. However, during the oil filtering process, the intercepted impurities are always located between the oil filter and the housing. Therefore, the impurities are easily adhered to the oil filter, blocking the oil filter, affecting the speed of the oil passing through the oil filter, and further affecting the working efficiency of the oil filter. Moreover, during the cleaning process of the oil filter, the above solution cannot continue to work, affecting the working efficiency of the oil filter. Summary of the Utility Model

[0004] The utility model provides an oil filter, which solves the problems put forward in the above background technique that the intercepted impurities remain at the oil inlet end of the oil filter, are easily adhered to the oil filter, affect the working efficiency of the oil filter, and during the cleaning of the oil filter, it cannot continue to work, affecting the working efficiency of the oil filter.

[0005] The utility model provides the following technical solution: an oil filter, including a housing, a filter element is fixed in the inner cavity of the housing, a connecting pipe is fixedly connected to the middle of the bottom of the inner cavity of the housing, the bottom end of the filter element is in close fit with the top end of the inner cavity of the connecting pipe, the bottom end of the inner cavity of the connecting pipe is threadedly connected with an impurity collection box, and an electric door is arranged on the top of the impurity collection box, a pressure sensor is arranged on the electric door, an oil discharge pipe is arranged on one side of the bottom end of the inner cavity of the housing, a sealing cover is fixed on the top of the housing, a sealing structure and a impurity removal structure are arranged at the bottom of the sealing cover, an oil inlet pipe is arranged in the middle of the sealing cover, and the bottom end of the oil inlet pipe extends to the bottom end of the inner cavity of the filter element;

[0006] The sealing structure includes a fixed ring fixedly connected to the top of the sealing cover and a driven ring movably connected to the inner cavity of the fixed ring, and the oil inlet pipe is movably connected to the inner cavity of the driven ring. The sealing structure contacts the top end of the inner cavity of the filter element.

[0007] The impurity removal structure includes a lower pressing plate connected to the sealing cover through a first hydraulic telescopic rod, a scraping ring connected to the sealing cover through a second hydraulic telescopic rod, a third hydraulic telescopic rod connected to the bottom of the sealing cover through a rotating ring, and an upper pressing plate connected to the third hydraulic telescopic rod. The lower pressing plate, the scraping ring, and the upper pressing plate are all located below the sealing structure. The lower pressing plate is located below the upper pressing plate. The first hydraulic telescopic rod and the second hydraulic telescopic rod are both movably connected to the fixed ring. The third hydraulic telescopic rod is movably connected to the driven ring. The lower pressing plate is adapted to the inner cavity of the scraping ring. The lower pressing plate is evenly provided with a first oil-permeable hole and an oil filter disc. The upper pressing plate is provided with a second oil-permeable hole and a through hole adapted to the oil filter disc.

[0008] Preferably, the bottom of the inner cavity of the housing is inclined, and the drain pipe is located at the bottom end of the inner cavity of the housing.

[0009] Preferably, one end of the top of the fixed ring is fixed with a fixed rod, and the top of the fixed rod is fixedly connected to the bottom of the sealing cover.

[0010] Preferably, the number of the through holes is the same as the number of the oil filter discs, the number of the second oil-permeable holes is the same as the number of the first oil-permeable holes, and when the through hole overlaps with the oil filter disc, the first oil-permeable hole and the second oil-permeable hole are in an overlapping state. When the first oil-permeable hole and the second oil-permeable hole overlap, the through hole and the oil filter disc are in a staggered state.

[0011] Preferably, the top end of the rotating ring is movably connected to the sealing cover, the bottom end of the rotating ring is fixedly connected to the third hydraulic telescopic rod, a toothed ring is fixedly connected to the bottom end of the rotating ring, a rotating motor is fixed to the top of the sealing cover, and a gear is fixedly connected to the end of the output shaft of the rotating motor. The gear meshes with the toothed ring.

[0012] Preferably, the mesh diameter of the oil filter disc is the same as the mesh diameter of the filter element, and one-way valves are evenly arranged on the side wall of the part of the oil inlet pipe located inside the filter element.

[0013] Preferably, an isolation ring is fixedly connected to the outer ring of the top end of the filter element, and the bottom of the isolation ring is at the same height as the bottom of the sealing structure.

[0014] Compared with the prior art, the utility model has the following beneficial effects:

[0015] 1. The oil filter can clean the filter element during the oil filtering process through the impurity removal structure, avoiding the blockage of the filter element caused by impurities adhering to it, ensuring the filtering efficiency of the filter element, and can also clean the impurities intercepted by the filter element during the oil filtering process, ensuring the working efficiency of the filter.

[0016] 2. The oil filter can achieve quick disassembly and assembly through the impurity collection box and the impurity removal structure. The plate-like structure formed by the scraping ring, the upper pressing plate and the lower pressing plate can seal the bottom of the filter element, so that the impurity collection box does not affect the operation of the oil filter during the cleaning process. Description of the Drawings

[0017] Figure 1 is a front view of the structure of the present invention;

[0018] Figure 2 is the structure of the present invention Figure 1 internal view;

[0019] Figure 3 is a sectional view of the filter element of the structure of the present invention;

[0020] Figure 4 is a bottom view of the sealing cover of the structure of the present invention;

[0021] Figure 5 is the structure of the present invention Figure 4 explosion view;

[0022] Figure 6 is an explosion view of the impurity removal structure of the structure of the present invention.

[0023] In the figure: 1. Housing; 2. Sealing cover; 3. Rotating motor; 4. Inlet oil pipe; 5. Outlet oil pipe; 6. Filter element; 7. Connecting pipe; 8. Impurity collection box; 9. Isolation ring; 10. Fixed ring; 11. First hydraulic telescopic rod; 12. Rotating ring; 13. Electric door; 14. Gear; 15. Pressure sensor; 16. Oil filtering disc; 17. First oil permeating hole; 18. Second hydraulic telescopic rod; 19. Fixed rod; 20. Driven ring; 21. Third hydraulic telescopic rod; 22. Lower pressing plate; 23. Scraping ring; 24. Upper pressing plate; 25. Through hole; 26. Second oil permeating hole. Detailed Embodiment

[0024] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present utility model.

[0025] The present utility model provides an oil filter, which includes a housing 1. A filter element 6 is fixed in the inner cavity of the housing. When the oil filter is in use, the filter element 6 is used to filter the oil to be filtered. The filter element 6 is cylindrical. In some embodiments of the present application, the filter element 6 uses a filter screen to filter the oil. In this embodiment, the mesh holes of the filter screen are 0.2 - 0.5 mm; the number of filter holes on the filter screen is 10 - 16 per square centimeter.

[0026] An isolation ring 9 is fixedly connected to the outer ring at the top of the filter element 6. Through the arrangement of the isolation ring 9, it is convenient to fix the filter element 6 to the housing 1. A connecting pipe 7 is fixed in the middle of the bottom of the inner cavity of the housing 1. The filter element 6 is in close fit with the top end of the inner cavity of the connecting pipe 7. The bottom end of the inner cavity of the connecting pipe 7 is threadedly connected with an impurity collection box 8. The top of the impurity collection box 8 is in close fit with the bottom of the filter element 6. And an electric door 13 is provided at the top end of the inner cavity of the impurity collection box 8. A pressure sensor 15 is provided on the electric door 13. Through the arrangement of the electric door 13, the impurity collection box 8 can be automatically opened and closed, which is convenient for the collection of the filtered impurities. Through the arrangement of the pressure sensor 15, the pressure received by the electric door 13 can be detected, and the opening and closing can be carried out according to the detected pressure value.

[0027] In some embodiments of the present application, the impurity collection box 8 includes a box body threadedly connected to the connecting pipe 7. The top of the box body is detachably connected with a box cover. Both sides of the top of the box cover are movably connected with door bodies. A rotating motor is fixed on the box cover. The door bodies are automatically opened and closed through the rotating motor. The door bodies and the rotating motor form the electric door 13.

[0028] An oil discharge pipe 5 is provided on one side of the bottom end of the inner cavity of the housing 1. The bottom of the inner cavity of the housing 1 is inclined. The oil discharge pipe 5 is located at the bottom end of the bottom of the inner cavity of the housing 1. Through the arrangement of the oil discharge pipe 5, it is convenient to discharge the filtered oil.

[0029] A sealing cover 2 is fixed to the top of the housing 1. A fuel inlet pipe 4 is fixed to the middle of the sealing cover 2. The bottom end of the fuel inlet pipe 4 extends to the bottom end of the inner cavity of the filter element 6. Through the arrangement of the fuel inlet pipe 4, the oil to be filtered can enter the inner cavity of the filter element 6 through the fuel inlet pipe 4. The filter element 6 can intercept impurities in the oil. The clean oil can pass through the filter element 6 and be discharged through the drain pipe 5. And a check valve is evenly arranged on the side wall of the part of the fuel inlet pipe 4 located in the filter element 6. Through the arrangement of the check valve, the oil can be prevented from flowing back into the fuel inlet pipe 4.

[0030] A sealing structure is arranged at the bottom of the sealing cover 2. The sealing structure includes a fixed ring 10 and a driven ring 20. One side of the top of the fixed ring 10 is fixedly connected with a fixed rod 19. The top of the fixed rod 19 is fixedly connected with the bottom of the sealing cover 2. The inner cavity of the fixed ring 10 is movably connected with the driven ring 20. The fuel inlet pipe 4 is movably connected with the inner cavity of the driven ring 20. And the fixed ring 10 is in contact with the top end of the inner cavity of the filter element 6. The bottom of the fixed ring 10 is at the same height as the bottom of the isolation ring 9. Through the arrangement of the sealing structure and the isolation ring 9, the sealing cavity formed by the housing 1 and the sealing cover 2 can be divided into two parts by the combined use of the sealing structure and the isolation ring 9. The cavity between the isolation ring 9 and the connecting pipe 7 is the filtering cavity. The oil after filtration can enter the filtering cavity. The cavity between the isolation ring 9 and the sealing cover 2 is the power cavity, and the oil can be prevented from entering the power cavity.

[0031] An impurity removal structure is arranged at the bottom of the sealing cover 2. The impurity removal structure includes a lower pressing plate 22, an upper pressing plate 24 and a scraping ring 23. The lower pressing plate 22, the upper pressing plate 24 and the scraping ring 23 are all located below the sealing structure. The lower pressing plate 22 is fixedly connected with the bottom of the sealing cover 2 through a first hydraulic telescopic rod 11. The top of the first hydraulic telescopic rod 11 is fixedly connected with the bottom of the sealing cover 2. The output end of the first hydraulic telescopic rod 11 is fixedly connected with the top of the lower pressing plate 22. And the output shaft of the first hydraulic telescopic rod 11 is in a movable connection state with the fixed ring 10. The telescopic movement of the first hydraulic telescopic rod 11 can change the position of the lower pressing plate 22. A first oil-permeable hole 17 and an oil filter disc 16 are evenly arranged on the lower pressing plate 22. The mesh diameter of the oil filter disc 16 is the same as the mesh diameter of the filter element 6. When the lower pressing plate 22 presses down, the oil can pass through the oil filter disc 16, and the impurities are intercepted by the oil filter disc 16, so that the impurities can be aggregated, and the redundant oil in the impurities can be separated from the impurities, which is convenient for the recovery of the impurities.

[0032] The outer diameter of the lower pressing plate 22 is the same as the inner diameter of the scraping ring 23. One side of the top of the scraping ring 23 is fixedly connected with the second hydraulic telescopic rod 18. The output end of the second hydraulic telescopic rod 18 is fixedly connected with the scraping ring 23. The other end of the second hydraulic telescopic rod 18 is fixedly connected with the bottom of the sealing cover 2. And the output end of the second hydraulic telescopic rod 18 is in a movable connection state with the fixing ring 10. Through the setting of the second hydraulic telescopic rod 18, the telescopic movement of the second hydraulic telescopic rod 18 can change the position of the scraping ring 23 fixedly connected therewith. The outer diameter of the scraping ring 23 is adapted to the inner diameter of the filter element 6. When the scraping ring 23 moves, the scraping ring 23 can scrape off the impurities adhering to the inner wall of the filter element 6.

[0033] The above-mentioned upper pressing plate 24 is located above the lower pressing plate 22. Both the upper pressing plate 24 and the lower pressing plate 22 are in a movable connection state with the oil inlet pipe 4. One side of the top of the upper pressing plate 24 is fixed with the third hydraulic telescopic rod 21. The output end of the third hydraulic telescopic rod 21 is in a movable connection state with the driven ring 20. The other end of the third hydraulic telescopic rod 21 is fixed with a rotating ring 12. The top end of the rotating ring 12 is in a movable connection state with the sealing cover 2. Through the setting of the third hydraulic telescopic rod 21, the telescopic movement of the third hydraulic telescopic rod 21 can change the position of the upper pressing plate 24, so that the distance between the upper pressing plate 24 and the lower pressing plate 22 can be changed. And the upper pressing plate 24 is provided with a second oil-permeable hole 26 and a through hole 25 adapted to the oil filtering disc 16. The number of the through holes 25 is the same as the number of the oil filtering discs 16. The number of the second oil-permeable holes 26 is the same as the number of the first oil-permeable holes 17. And when the through hole 25 overlaps with the oil filtering disc 16, the first oil-permeable hole 17 and the second oil-permeable hole 26 are in an overlapping state. When the first oil-permeable hole 17 and the second oil-permeable hole 26 overlap, the through hole 25 and the oil filtering disc 16 are in a staggered state.

[0034] The top end of the rotating ring 12 is movably connected with the sealing cover 2. The bottom end of the rotating ring 12 is fixedly connected with the third hydraulic telescopic rod 21. The bottom end of the rotating ring 12 is fixedly connected with a toothed ring. The top of the sealing cover 2 is fixed with a rotating motor 3. The end of the output shaft of the rotating motor 3 is fixedly connected with a gear 14 through a speed reducer. The gear 14 meshes with the toothed ring. Through the setting of the rotating motor 3, the rotation of the rotating motor 3 can drive the gear 14 fixedly connected therewith to rotate. The gear 14 can drive the rotating ring 12 to rotate through the toothed ring meshing therewith. The rotating ring 12 can drive the upper pressing plate 24 to rotate through the third hydraulic telescopic rod 21 fixedly connected therewith. The through hole 25 and the oil filtering disc 16 can overlap or be staggered. The first oil-permeable hole 17 and the second oil-permeable hole 26 can be staggered or overlap. And when the filter is in use, the following situations may occur: when the through hole 25 and the oil filtering disc 16 are in a staggered state, the first oil-permeable hole 17 and the second oil-permeable hole 26 are also in a staggered state; when the through hole 25 and the oil filtering disc 16 are in a staggered state, the first oil-permeable hole 17 and the second oil-permeable hole 26 are in an overlapping state; when the through hole 25 and the oil filtering disc 16 are in an overlapping state, the first oil-permeable hole 17 and the second oil-permeable hole 26 are in a staggered state.

[0035] During the impurity removal process of the filter element 6, the through holes 25 and the oil filtering plate 16 are in an overlapping state, and the bottom of the scraping ring 23 is at the same height as the bottom of the lower pressing plate 22. The bottom of the upper pressing plate 24 is in close contact with the top of the lower pressing plate 22. The plate-like structure composed of the scraping ring 23, the lower pressing plate 22, and the upper pressing plate 24 can scrape off the impurities adhering to the inner wall of the filter element 6 during movement, and can intercept, gather, and compress the impurities, realizing the cleaning of the impurities intercepted by the filter element 6 during the use of the filter. During the reset process of the impurity removal structure, the first oil through hole 17 and the second oil through hole 26 are in an overlapping state, and the lower pressing plate 22 and the upper pressing plate 24 are in a closely attached state. The structure composed of the lower pressing plate 22 and the upper pressing plate 24 will not intercept the oil during the reset process, facilitating the normal use of the filter. After the structure composed of the lower pressing plate 22 and the upper pressing plate 24 is reset, the scraping ring 23 is reset, reducing the amount of impurities intercepted by the impurity removal structure and facilitating the cleaning of the impurity removal structure.

[0036] The electrical components involved in this application are all prior arts. Those skilled in the art understand their connection methods. Through those skilled in the art, all the electrical components in this application are connected to their adapted power sources through wires, and a suitable controller is selected according to the actual situation to meet the control requirements. For the specific connection and control sequence, refer to the following description. The electrical connection is completed in the order of the working sequence of each electrical component. The detailed connection means are well-known technologies in this field. The following mainly introduces the working principle and process, and no further description of the electrical control will be made.

[0037] In summary, when the oil filter is in use, the oil to be filtered enters the filter element 6 through the inlet pipe 4. The filter element 6 intercepts the impurities in the oil. The filtered oil enters the space between the filter element 6 and the housing 1 and is discharged through the drain pipe 5. The hydraulic telescopic rod three 21 drives the scraping ring 23 to move. During the movement of the scraping ring 23, the impurities adhering to the inner wall of the filter element 6 can be scraped off, preventing the impurities from adhering to the filter element 6 and ensuring the passing speed of the oil. Moreover, the impurity removal structure works regularly. When the impurity removal structure works, the bottom of the scraping ring 23 and the bottom of the lower pressing plate 22 are at the same height, and the through hole 25 and the oil filtering disc 16 are in an overlapping state. The hydraulic telescopic rod one 11, the hydraulic telescopic rod two 18, and the hydraulic telescopic rod three 21 extend simultaneously, making the scraping ring 23, the lower pressing plate 22, and the upper pressing plate 24 all in a static state, and the through hole 25 and the oil filtering disc 16 are in an overlapping state. And during the downward movement of the plate-like structure composed of the scraping ring 23, the lower pressing plate 22, and the upper pressing plate 24, the impurities adhering to the filter element 6 can be scraped off, and the impurities can be intercepted and limited, so that the filtered impurities can gather. When the pressure exerted by the plate-like structure on the electric door 13 reaches the detection value set by the pressure sensor 15, the rotating motor 3 works. The rotating motor 3 drives the gear 14 fixedly connected thereto to rotate. The gear 14 drives the rotating ring 12 to rotate through the engaged toothed ring. The rotating ring 12 drives the upper pressing plate 24 to rotate through the hydraulic telescopic rod three 21 until the oil passing hole one 17 and the oil passing hole two 26 are in a staggered state, and the through hole 25 and the oil filtering disc 16 are in a staggered state. At this time, the plate-like structure is in a sealed state, and the electric door 13 is in an open state. The impurities can fall into the impurity collection box 8 under the action of the extrusion and gravity of the plate-like structure, realizing the collection of impurities. After the impurities are collected, the electric door 13 closes, and the rotating motor 3 drives the upper pressing plate to reset, making the oil passing hole one 17 and the oil passing hole two 26 in an overlapping state. After the upper pressing plate 24 and the lower pressing plate 22 are reset first, the scraping ring 23 is reset again.

[0038] The standard parts used in the present utility model can all be purchased from the market. The special-shaped parts can be customized according to the description in the specification and the drawings. The specific connection methods of each part all adopt conventional means such as bolts, rivets, and welding that are mature in the prior art. The machines, parts, and equipment all adopt conventional models in the prior art, which will not be elaborated here. The content not described in detail in this specification belongs to the prior art well-known to those skilled in the art. Although the embodiments of the present utility model have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principle and spirit of the present utility model. The scope of the present utility model is defined by the appended claims and their equivalents.

Claims

1. An oil filter, comprising a housing (1), characterized in that: A filter element (6) is fixed inside the inner cavity of the housing (1). A connecting pipe (7) is fixedly connected to the middle of the bottom of the inner cavity of the housing (1). The bottom end of the filter element (6) is in close contact with the top end of the inner cavity of the connecting pipe (7). The bottom end of the inner cavity of the connecting pipe (7) is threadedly connected with an impurity collection box (8), and an electric door (13) is provided on the top of the impurity collection box (8). A pressure sensor (15) is provided on the electric door (13). An oil drain pipe (5) is provided on one side of the bottom end of the inner cavity of the housing (1). A sealing cover (2) is fixed on the top of the housing (1). A sealing structure and an impurity removal structure are provided at the bottom of the sealing cover (2). An oil inlet pipe (4) is provided in the middle of the sealing cover (2). The bottom end of the oil inlet pipe (4) extends to the bottom end of the inner cavity of the filter element (6); The sealing structure includes a fixed ring (10) fixedly connected to the top of the sealing cover (2) and a driven ring (20) movably connected to the inner cavity of the fixed ring (10), and the oil inlet pipe (4) is movably connected to the inner cavity of the driven ring (20). The sealing structure is in contact with the top end of the inner cavity of the filter element (6). The impurity removal structure includes a lower pressing plate (22) connected to the sealing cover (2) through a first hydraulic telescopic rod (11), a scraping ring (23) connected to the sealing cover (2) through a second hydraulic telescopic rod (18), a third hydraulic telescopic rod (21) connected to the bottom of the sealing cover (2) through a rotating ring (12), and an upper pressing plate (24) connected to the third hydraulic telescopic rod (21). The lower pressing plate (22), the scraping ring (23), and the upper pressing plate (24) are all located below the sealing structure. The lower pressing plate (22) is located below the upper pressing plate (24). The first hydraulic telescopic rod (11) and the second hydraulic telescopic rod (18) are both movably connected to the fixed ring (10). The third hydraulic telescopic rod (21) is movably connected to the driven ring (20). The lower pressing plate (22) is adapted to the inner cavity of the scraping ring (23). The lower pressing plate (22) is evenly provided with a first oil-permeable hole (17) and an oil filtering disc (16). The upper pressing plate (24) is provided with a second oil-permeable hole (26) and a through hole (25) adapted to the oil filtering disc (16).

2. The oil filter according to claim 1, wherein: The bottom of the inner cavity of the housing (1) is inclined, and the oil drain pipe (5) is located at the bottom end of the bottom of the inner cavity of the housing (1).

3. An oil filter according to claim 1, characterized in that: One end of the top of the fixed ring (10) is fixedly provided with a fixed rod (19), and the top of the fixed rod (19) is fixedly connected to the bottom of the sealing cover (2).

4. The oil filter according to claim 1, characterized in that: The number of the through holes (25) is the same as the number of the oil filtering discs (16). The number of the second oil-permeable holes (26) is the same as the number of the first oil-permeable holes (17). When the through holes (25) overlap with the oil filtering discs (16), the first oil-permeable holes (17) and the second oil-permeable holes (26) are in an overlapping state. When the first oil-permeable holes (17) overlap with the second oil-permeable holes (26), the through holes (25) and the oil filtering discs (16) are in a staggered state.

5. An oil filter according to claim 1, characterized in that: The top end of the rotating ring (12) is movably connected to the sealing cover (2). The bottom end of the rotating ring (12) is fixedly connected to the third hydraulic telescopic rod (21). A toothed ring is fixedly connected to the bottom end of the rotating ring (12). A rotating motor (3) is fixed to the top of the sealing cover (2). The end of the output shaft of the rotating motor (3) is fixedly connected to a gear (14), and the gear (14) meshes with the toothed ring.

6. The oil filter according to claim 1, characterized in that: The mesh diameter of the oil filter disc (16) is the same as that of the filter element (6). Check valves are evenly arranged on the side wall of the part of the oil inlet pipe (4) located inside the filter element (6).

7. An oil filter according to claim 1, characterized in that: An isolation ring (9) is fixedly connected to the outer circle at the top end of the filter element (6), and the bottom of the isolation ring (9) is at the same height as the bottom of the sealing structure.

Images