Hydraulic oil filter assembly

Abstract

The invention relates to the technical field of oil filtration, in particular to a hydraulic oil filter assembly. Comprising a shell, the upper end of the shell is fixedly communicated with an inlet pipe and an outlet pipe, a main filter element is slidably arranged in the shell below the outlet pipe, the outlet pipe is communicated with the interior of the main filter element, and the left side of the lower end of the main filter element is elastically and rotatably connected with the lower end of the shell through a main rotating part; the left side of the lower end of the auxiliary filter element is rotationally connected with the shell bottom plate through an auxiliary rotating piece; the main rotating piece is in transmission connection with the auxiliary rotating piece. According to the filter, system pressure energy and mechanical energy storage drive switching actions are completely utilized, and an external power source or hydraulic circuit transformation is not needed.

Description

Technical Field

[0001] The present invention relates to the technical field of oil filtration, and in particular to a hydraulic oil filter assembly. Background Art

[0002] As the core power transmission medium of modern industrial equipment, the reliability of hydraulic systems depends directly on the cleanliness of the hydraulic oil. Hydraulic oil filters, key components for oil contamination control, play the crucial role of intercepting solid particulate matter and preventing wear on system components. Traditional filters generally utilize a single filter element. When the filter element accumulates contaminants, causing a rise in differential pressure, the system must be shut down for manual replacement or cleaning. This process not only interrupts equipment operations and reduces production efficiency, but also introduces the risk of secondary contamination during replacement. Frequent maintenance, especially in high-precision hydraulic equipment or continuous production lines, significantly increases operating costs and poses safety risks.

[0003] Although some attempts at dual-filter redundant designs exist in the existing technology, their switching mechanisms mostly rely on external electrical control or manual operation, resulting in complex structures and delayed responses. More critically, the clogged filter element is immersed in oil for a long time before replacement, and the accumulated pollutants may fall off due to vibration or oil flow erosion, forming a secondary source of pollution. In addition, mechanical switching mechanisms often face problems such as motion interference, sealing failure, or unreliable action. Especially under high-pressure conditions, dynamic sealing and precise positioning during the rotation of the filter element become technical bottlenecks. How to achieve automatic sensing of filter element blockage, uninterrupted switching, and physical isolation of clogged filter elements, while ensuring the smoothness of the switching action and structural sealing, has become a technical problem that urgently needs to be broken through in the field of hydraulic filtration. Summary of the Invention

[0004] The main purpose of the present invention is to provide a hydraulic oil filter assembly capable of automatically replacing a filter element.

[0005] In order to achieve the above object, the technical solution provided by the present invention is: The hydraulic oil filter assembly includes a housing, the upper end of the housing is fixedly connected with an inlet pipe and an outlet pipe, a main filter element is slidingly arranged in the housing below the outlet pipe, the outlet pipe is connected to the inside of the main filter element, the left side of the lower end of the main filter element is elastically rotatably connected to the lower end of the housing through the main rotating member, an auxiliary filter element is slidingly arranged in the housing on the right side of the main filter element, the left side of the lower end of the auxiliary filter element is rotatably connected to the bottom plate of the housing through the auxiliary rotating member, the main rotating member and the auxiliary rotating member are transmission-connected, a limit component is arranged on the outer side of the lower end of the main filter element, a pressure trigger component is arranged at the lower end of the housing, the pressure trigger component is connected to the limit component, the lower end of the housing on the left side of the main filter element An annular first elastic protection unit is provided, an annular first groove is opened in the lower end of the shell, the first elastic protection unit is compressed in the first groove, the main rotating part blocks the upper end of the first elastic protection unit, an annular second groove is opened in the lower end of the shell on the right side of the main filter element, an annular second elastic protection unit is installed in the second groove, the auxiliary filter element is located in the second elastic protection unit, the lower end of the second elastic protection unit is fixedly sealed in the second groove, the upper end of the second elastic protection unit is in sealing contact with the top plate of the shell, the second elastic protection unit is stretched, and the right side of the upper end of the main filter element limits the upper end of the second elastic protection unit.

[0006] After the pressure in the shell increases, the pressure triggers the action of the component and links the limit component. After the action of the limit component, the main filter element is lost, and then the main rotating member causes the main filter element to rotate. The main rotating member causes the auxiliary filter element to rotate through the auxiliary rotating member. After the main filter element rotates, the limiting effect on the upper end of the second elastic protection unit is lost, and the second elastic protection unit retracts into the second groove. After the second elastic protection unit retracts into the second groove, it will not block the rotation of the auxiliary filter element. After the main filter element rotates to the inside of the first groove, the main rotating member loses its limiting effect on the first elastic protection unit. After the first elastic protection unit is extended, its upper end is in sealing contact with the top plate of the shell. At this time, the auxiliary filter element rotates to the bottom of the outlet pipe, and the outlet pipe is connected to the inside of the auxiliary filter element. The limiting component limits the lower end of the auxiliary filter element.

[0007] Specifically, the upper and lower ends of the main filter element are in sliding and sealing contact with the top plate and the bottom plate of the shell respectively, and the upper and lower ends of the auxiliary filter element are in sliding and sealing contact with the top plate and the bottom plate of the shell respectively.

[0008] Specifically, the main rotating member includes a first rotating shaft, which is rotatably connected to the bottom plate of the shell, and the first rotating shaft is connected to the bottom plate of the shell through a torsion spring. A first connecting plate is fixed to the upper end of the first rotating shaft, and the first connecting plate is fixedly connected to the left side of the lower end of the main filter element; the auxiliary rotating member includes a second rotating shaft, and the second rotating shaft is installed in the bottom plate part of the shell on the inner side of the second groove, and the second rotating shaft is rotatably connected to the bottom plate of the shell, and a second connecting plate is fixed to the upper end of the second rotating shaft, and the second connecting plate is located on the inner side of the second elastic protection unit, and the second connecting plate is fixedly connected to the left side of the lower end of the auxiliary filter element.

[0009] Specifically, an inner groove is opened in the bottom plate of the shell, the lower end of the first rotating shaft is located in the inner groove, the lower end of the second rotating shaft is located in the inner groove, a first gear is concentrically fixed to the lower end of the first rotating shaft, and a second gear is concentrically fixed to the lower end of the second rotating shaft. The first gear and the second gear are connected by a chain transmission, and the first gear, the second gear and the chain are located in the inner groove.

[0010] The cam is fixedly mounted on the bottom plate of the housing, and the cam is connected to the bottom plate of the housing by a screw thread insert in the cam, and the cam is connected to the bottom plate of the housing by a screw thread insert in the cam.

[0011] Specifically, the first elastic protection unit includes a first annular plate, the first annular plate is located in the first groove, the first rotating shaft is located on the inner side of the first annular plate, the upper end of the first annular plate is blocked by the lower end of the first connecting plate, after the first connecting plate and the main filter element rotate to the inner side of the first annular plate, the first elastic protection unit extends, the first annular plate is connected to the bottom of the first groove through multiple spring telescopic rods, the first annular plate is connected to the bottom of the first groove through a first elastic diaphragm sleeve, multiple spring telescopic rods are located on the inner side of the first elastic diaphragm sleeve, the upper end of the first elastic diaphragm sleeve is fixedly connected to the first annular plate, and the lower end of the first elastic diaphragm sleeve is fixedly connected to the bottom of the first groove.

[0012] Specifically, the second elastic protection unit includes a second annular plate, which is sealed and inserted in the annular groove of the top plate of the shell. A stopper is fixed to the right side of the upper end of the main filter element, and the upper end of the stopper blocks the lower end of the second annular plate. The second annular plate is connected to the bottom of the second groove through multiple tension spring telescopic rods. The second annular plate is connected to the bottom of the second groove through a second elastic diaphragm sleeve. Multiple tension spring telescopic rods are located on the inner side of the second elastic diaphragm sleeve. The upper end of the second elastic diaphragm sleeve is fixedly connected to the second annular plate, and the lower end of the second elastic diaphragm sleeve is fixedly connected to the bottom of the second groove.

[0013] Specifically, an arc-shaped limiting groove is opened in the bottom plate of the shell outside the first rotating shaft, a limiting slider is fixed on the outside of the first rotating shaft, the limiting block is slidably set in the limiting groove, and a friction block is embedded and fixed in the groove wall of the limiting groove. During the rotation of the first rotating shaft, the limiting slider can slide in contact with the friction block.

[0014] Compared with the prior art, the present invention has the following beneficial effects: 1. The system automatically senses the blockage status of the main filter element through changes in hydraulic pressure within the housing, triggering the pressure trigger assembly to release the limiter assembly, integrating fault self-diagnosis with actuation triggering. The main and auxiliary rotating parts are rigidly driven by a gear chain, ensuring that the main and auxiliary filter elements rotate 180° at the same speed and in the same direction, precisely positioning the auxiliary filter element below the outlet pipe to take over the filtration function. The entire switching process requires no downtime or manual intervention.

[0015] 2. When the primary filter element switches to the standby position, the first elastic protection unit automatically extends to form a circumferential physical barrier, completely sealing and isolating the clogged filter element and blocking the path for impurities to fall out. In the initial state, the second elastic protection unit wraps around the secondary filter element, isolating it from contact with the hydraulic oil.

[0016] 3. The sliding contact design between the limit slider and the friction block actively reduces speed during the critical period when the block disengages from the second annular plate, ensuring the full retraction of the second elastic protection unit and eliminating motion interference between the auxiliary filter element and the second elastic protection unit. When the curved plate's guide slope contacts the auxiliary filter element, it drives the curved plate temporarily downward. Once the auxiliary filter element is in place, the curved plate automatically resets, locks, and limits the auxiliary filter element, ensuring its stable performance.

[0017] 4. This filter fully utilizes system pressure energy and mechanical energy storage to drive switching action, without the need for external power supply or hydraulic circuit modification. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a cross-sectional view of the present invention.

[0019] Figure 2 Schematic diagram of the connection between the pressure trigger component and the arc plate of the limit component.

[0020] Figure 3 A schematic diagram of the limit assembly.

[0021] Figure 4 Schematic diagram of the first elastic protection unit and the second elastic protection unit in the initial state.

[0022] Figure 5 This is a schematic diagram of the stopper limiting the second annular plate.

[0023] Figure 6 This is a schematic diagram of the limit slider located in the limit slide.

[0024] The names of the parts in the accompanying drawings are: 1. Shell; 2. Inlet pipe; 3. Outlet pipe; 4. Main filter element; 5. First connecting plate; 6. First rotating shaft; 601. Limiting slide groove; 602. Limiting slider; 603. Friction block; 7. First gear; 8. Auxiliary filter element; 9. Second connecting plate; 10. Second rotating shaft; 11. Second gear; 12. Chain; 13. First groove; 14. First annular plate; 15. Spring telescopic rod; 16. First elastic diaphragm sleeve; 17. Second groove; 18. Annular groove; 19. Second annular plate; 20. Tension spring telescopic rod; 21. Second elastic diaphragm sleeve; 22. Stop block; 23. Limiting plate; 24. Arc plate; 25. Guide slope; 26. Connector; 27. Sliding plate; 28. Lower spring; 29. ​​Connecting groove; 30. Arc groove; 31. Lower groove. DETAILED DESCRIPTION

[0025] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0026] like Figures 1-6 As shown, the hydraulic oil filter assembly includes a housing 1. An inlet pipe 2 and an outlet pipe 3 are fixedly connected to the upper end of the housing 1. A main filter element 4 is slidably mounted within the housing 1 below the outlet pipe 3. The outlet pipe 3 is connected to the interior of the main filter element 4. The upper and lower ends of the main filter element 4 are in sliding and sealing contact with the top and bottom plates of the housing 1, respectively.

[0027] The left side of the lower end of the main filter element 4 is elastically rotatably connected to the lower end of the housing 1 via a main rotating member. A secondary filter element 8 is slidably mounted within the housing 1 to the right of the main filter element 4. Its upper and lower ends are in sliding, sealing contact with the top and bottom plates of the housing 1, respectively. The left side of the lower end of the secondary filter element 8 is rotatably connected to the bottom plate of the housing 1 via a secondary rotating member. The main rotating member and the secondary rotating member are in transmission connection.

[0028] The main rotating part includes a first rotating shaft 6, which is rotatably connected to the bottom plate of the shell 1. The first rotating shaft 6 is connected to the bottom plate of the shell 1 through a torsion spring. A first connecting plate 5 is fixed to the upper end of the first rotating shaft 6, and the first connecting plate 5 is fixedly connected to the left side of the lower end of the main filter element 4.

[0029] The auxiliary rotating part includes a second rotating shaft 10, which is installed in the bottom plate part 1 of the shell inside the second groove 17. The second rotating shaft 10 is rotatably connected to the bottom plate of the shell 1. A second connecting plate 9 is fixed to the upper end of the second rotating shaft 10. The second connecting plate 9 is located on the inside of the second elastic protective unit. The second connecting plate 9 is fixedly connected to the left side of the lower end of the auxiliary filter element 8.

[0030] An inner groove is opened in the bottom plate of the shell 1, the lower end of the first rotating shaft 6 is located in the inner groove, the lower end of the second rotating shaft 10 is located in the inner groove, the lower end of the first rotating shaft 6 is concentrically fixed with a first gear 7, the lower end of the second rotating shaft 10 is concentrically fixed with a second gear 11, the first gear 7 and the second gear 11 are connected by a chain 12, and the first gear 7, the second gear 11 and the chain 12 are located in the inner groove.

[0031] A limit assembly is provided on the outer side of the lower end of the main filter element 4, and a pressure trigger assembly is provided on the lower end of the shell 1, and the pressure trigger assembly is connected to the limit assembly.

[0032] The limiting assembly includes a limiting plate 23 and an arc plate 24. The limiting plate 23 is fixed to the upper end of the bottom plate of the shell 1. The limiting plate 23 is arc-shaped. The arc plate 24 is slidingly connected to the bottom plate of the shell 1. The arc plate 24 can slide in the vertical direction of the bottom plate of the shell 1. The limiting plate 23 and the arc plate 24 are located on the outside of the main filter element 4. The limiting plate 23 and the arc plate 24 are concentric with the main filter element 4. The inner edge of the limiting plate 23 and the inner edge of the arc plate 24 are in contact with the outer edge of the lower end of the main filter element 4. An arc groove 30 is opened on the bottom plate of the shell 1. The sliding seal of the arc plate 24 is arranged in the arc groove 30. The outer side of the upper end of the arc plate 24 is processed with an arc-shaped guide slope 25.

[0033] The pressure trigger assembly includes a lower groove 31 opened on the bottom plate of the shell 1, and a sliding plate 27 is slidingly and sealedly connected in the lower groove 31. A lower spring 28 is arranged in the lower groove 31, and the upper end of the lower spring 28 is fixedly connected to the upper end of the sliding plate 27, and the lower end of the lower spring 28 is fixedly connected to the bottom plate of the shell 1. The lower groove 31 is connected to the arc groove 30 through a connecting groove 29, and a connecting member 26 is arranged in the connecting groove 29. One end of the connecting member 26 is fixedly connected to the sliding plate 27, and the other end of the connecting member 26 is fixedly connected to the arc plate 24.

[0034] An annular first elastic protection unit is provided at the lower end of the shell 1 on the left side of the main filter element 4. An annular first groove 13 is opened in the lower end of the shell 1. The first elastic protection unit is compressed in the first groove 13, and the main rotating part blocks the upper end of the first elastic protection unit.

[0035] An annular second groove 17 is opened in the lower end of the shell 1 on the right side of the main filter element 4, and an annular second elastic protection unit is installed in the second groove 17. The auxiliary filter element 8 is located in the second elastic protection unit, and the lower end of the second elastic protection unit is fixedly sealed in the second groove 17. The upper end of the second elastic protection unit is in sealing contact with the top plate of the shell 1. The second elastic protection unit is stretched, and the right side of the upper end of the main filter element 4 limits the upper end of the second elastic protection unit.

[0036] The first elastic shielding unit includes a first annular plate 14, which is positioned within the first groove 13. The first rotating shaft 6 is positioned inside the first annular plate 14. The upper end of the first annular plate 14 is blocked by the lower end of the first connecting plate 5. After the first connecting plate 5 and the primary filter element 4 rotate to the inside of the first annular plate 14, the first elastic shielding unit extends.

[0037] The first annular plate 14 is connected to the bottom of the first groove 13 through multiple spring telescopic rods 15, and the first annular plate 14 is connected to the bottom of the first groove 13 through a first elastic diaphragm sleeve 16. The multiple spring telescopic rods 15 are located on the inner side of the first elastic diaphragm sleeve 16. The upper end of the first elastic diaphragm sleeve 16 is fixedly connected to the first annular plate 14, and the lower end of the first elastic diaphragm sleeve 16 is fixedly connected to the bottom of the first groove 13.

[0038] The second elastic protective unit includes a second annular plate 19, which is sealed and inserted into the annular groove 18 on the top plate of the housing 1. A stopper 22 is fixed to the right side of the upper end of the main filter element 4, and the upper end of the stopper 22 blocks the lower end of the second annular plate 19. The second annular plate 19 is connected to the bottom of the second groove 17 via multiple tension spring telescopic rods 20. The second annular plate 19 and the bottom of the second groove 17 are connected via a second elastic diaphragm sleeve 21. The multiple tension spring telescopic rods 20 are located inside the second elastic diaphragm sleeve 21. The upper end of the second elastic diaphragm sleeve 21 is fixedly connected to the second annular plate 19, and the lower end of the second elastic diaphragm sleeve 21 is fixedly connected to the bottom of the second groove 17.

[0039] After the pressure in the housing 1 increases, the pressure trigger assembly is activated and the limit assembly is linked. After the limit assembly is activated, it loses its limiting effect on the main filter element 4. Then the main rotating member causes the main filter element 4 to rotate. The main rotating member causes the auxiliary filter element 8 to rotate through the auxiliary rotating member. After the main filter element 4 rotates, it loses its limiting effect on the upper end of the second elastic protective unit. The second elastic protective unit retracts into the second groove 17. After the second elastic protective unit retracts into the second groove 17, it will not block the rotation of the auxiliary filter element 8. After the main filter element 4 rotates to the inside of the first groove 13, the main rotating member loses its limiting effect on the first elastic protective unit. After the first elastic protective unit extends, its upper end is in sealing contact with the top plate of the housing 1. At this time, the auxiliary filter element 8 rotates to the bottom of the outlet pipe 3, and the outlet pipe 3 is connected to the interior of the auxiliary filter element 8. The limit assembly limits the lower end of the auxiliary filter element 8.

[0040] In the initial state, the interior of the main filter element 4 is connected to the outlet pipe 3, and the torsion spring connecting the first rotating shaft 6 to the housing 1 is in a charged state. The main filter element 4 is immobilized by the restraining action of the stop plate 23 and the curved plate 24. At this point, the multiple spring telescopic rods 15 are compressed, and the first annular plate 14 has an upward tendency, but is blocked by the first connecting plate 5. The first elastic diaphragm sleeve 16 is located within the first groove 13.

[0041] The second annular plate 19 is located in the annular groove 18, and multiple tension spring telescopic rods 20 are in an extended state. The second annular plate 19 has a downward trend, but the second annular plate 19 is blocked by the block 22, and the second elastic diaphragm sleeve 21 is stretched and located on the outside of the auxiliary filter element 8. The hydraulic oil in the housing 1 does not contact the auxiliary filter element 8.

[0042] During use, the hydraulic oil enters the housing 1 through the inlet pipe 2 , and is filtered by the main filter element 4 before being discharged from the outlet pipe 3 .

[0043] When the main filter element 4 becomes clogged, the pressure inside the housing 1 increases. Under the pressure of the hydraulic system within the housing 1, the sliding plate 27 overcomes the elasticity of the lower spring 28 and moves downward. This sliding plate 27 drives the curved plate 24 downward via the connecting member 26. Once the upper end of the curved plate 24 enters the arcuate groove 30, the main filter element 4 is no longer restrained by the curved plate 24. Under the elastic force of the torsion spring, the first rotating shaft 6 drives the main filter element 4 counterclockwise via the first connecting plate 5. Simultaneously, the first rotating shaft 6 drives the second rotating shaft 10 via the first gear 7, chain 12, and second gear 11. The second rotating shaft 10 drives the auxiliary filter element 8 via the second connecting plate 9. Consequently, the main filter element 4 and the auxiliary filter element 8 rotate in the same direction and at the same speed.

[0044] After the block 22 separates from the second annular plate 19, the second annular plate 19 is no longer blocked by the block 22. Under the tension of the tension spring telescopic rod 20, the second annular plate 19 moves downward and enters the second groove 17. The second elastic diaphragm sleeve 21 is located in the second groove 17, and the second elastic protection unit will not block the rotation of the auxiliary filter element 8.

[0045] After the main filter element 4 and auxiliary filter element 8 rotate 180 degrees relative to their initial state, the main filter element 4 and the first connecting plate 5 are located inside the first annular plate 14. The first annular plate 14 moves upward under the elastic action of the spring telescopic rod 15, and the first elastic diaphragm sleeve 16 is stretched. When the first annular plate 14 is in sealing contact with the top plate of the housing 1, the first elastic diaphragm sleeve 16 is located outside the main filter element 4. At this time, the auxiliary filter element 8 is located below the outlet pipe 3, and the outlet pipe 3 is connected to the interior of the auxiliary filter element 8.

[0046] During the rotation of the main filter element 4 and the auxiliary filter element 8, when the main filter element 4 is located above the curved plate 24, the main filter element 4 is staggered with the outlet pipe 3, the pressure in the shell 1 is restored, and the sliding plate 27, the connecting piece 26 and the curved plate 24 have a tendency to move upward under the elastic action of the lower spring 28. Since the main filter element 4 is located above the curved plate 24, the curved plate 24 will be blocked and cannot move upward. After the main filter element 4 and the curved plate 24 are misaligned, the curved plate 24, the connecting piece 26 and the sliding plate 27 are reset upward under the elastic action of the lower spring 28. Afterwards, after the auxiliary filter element 8 contacts the guide slope 25 of the arc plate 24, with the rotation of the auxiliary filter element 8 and the guiding action of the guide slope 25, the arc plate 24, the connecting piece 26 and the sliding plate 27 overcome the elasticity of the lower spring 28 and move downward. After the auxiliary filter element 8 contacts the limit plate 23, the main filter element 4 and the auxiliary filter element 8 stop moving. At this time, the auxiliary filter element 8 no longer presses the arc plate 24. Under the elastic action of the lower spring 28, the sliding plate 27, the connecting piece 26 and the arc plate 24 move upward to the initial state. At this time, the auxiliary filter element 8 is in a non-rotatable state under the limiting action of the limit plate 23 and the arc plate 24.

[0047] During the process of filtering the hydraulic oil using the auxiliary filter element 8, since the main filter element 4 is located inside the first elastic diaphragm sleeve 16, the main filter element 4 can be separated from the hydraulic oil in the housing 1 under the action of the first elastic diaphragm sleeve 16, thereby preventing impurities on the main filter element 4 from falling off and mixing with the hydraulic oil.

[0048] An arc-shaped limiting groove 601 is opened in the bottom plate of the shell 1 outside the first rotating shaft 6, and a limiting slider 602 is fixed on the outside of the first rotating shaft 6. The limiting block is slidably set in the limiting groove 601, and a friction block 603 is embedded and fixed in the groove wall of the limiting groove 601. During the rotation of the first rotating shaft 6, the limiting slider 602 can slide in contact with the friction block 603.

[0049] When the first rotating shaft 6 rotates, it drives the limiting slider 602 to slide within the limiting slot 601. When the limiting slider 602 contacts the friction block 603, the primary filter element 4 drives the stopper 22 to rotate and disengage from the second annular plate 19. During the period of sliding contact between the limiting slider 602 and the friction block 603, the rotation speed of the first rotating shaft 6 slows down, thereby slowing down the rotation speed of the primary filter element 4 and the auxiliary filter element 8. This allows sufficient time for the second annular plate 19 to descend, preventing motion interference between the auxiliary filter element 8 and the second annular plate 19.

[0050] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A hydraulic oil filter assembly, comprising a housing (1), wherein an inlet pipe (2) and an outlet pipe (3) are fixedly connected to the upper end of the housing (1), and characterized in that: A main filter element (4) is slidably provided in the housing (1) below the outlet pipe (3), the outlet pipe (3) is communicated with the interior of the main filter element (4), the left side of the lower end of the main filter element (4) is elastically rotatably connected to the lower end of the housing (1) through a main rotating member, a secondary filter element (8) is slidably provided in the housing (1) on the right side of the main filter element (4), the left side of the lower end of the secondary filter element (8) is rotatably connected to the bottom plate of the housing (1) through a secondary rotating member, the main rotating member and the secondary rotating member are transmission-connected, a limit assembly is provided on the outer side of the lower end of the main filter element (4), a pressure trigger assembly is provided at the lower end of the housing (1), the pressure trigger assembly is connected to the limit assembly, and a first elastic ring is provided at the lower end of the housing (1) on the left side of the main filter element (4). A protective unit is provided, wherein a first annular groove (13) is provided in the lower end of the housing (1), the first elastic protective unit is compressed in the first groove (13), the main rotating member blocks the upper end of the first elastic protective unit, a second annular groove (17) is provided in the lower end of the housing (1) on the right side of the main filter element (4), the second annular elastic protective unit is installed in the second groove (17), the auxiliary filter element (8) is located in the second elastic protective unit, the lower end of the second elastic protective unit is fixedly sealed in the second groove (17), the upper end of the second elastic protective unit is in sealing contact with the top plate of the housing (1), the second elastic protective unit is stretched, and the right side of the upper end of the main filter element (4) limits the upper end of the second elastic protective unit.

2. The hydraulic oil filter assembly according to claim 1, characterized in that: The upper and lower ends of the main filter element (4) are in sliding and sealing contact with the top plate and bottom plate of the housing (1), respectively; the upper and lower ends of the auxiliary filter element (8) are in sliding and sealing contact with the top plate and bottom plate of the housing (1), respectively.

3. The hydraulic oil filter assembly according to claim 1, characterized in that: The main rotating member comprises a first rotating shaft (6), the first rotating shaft (6) is rotatably connected to the bottom plate of the housing (1), the first rotating shaft (6) is connected to the bottom plate of the housing (1) via a torsion spring, a first connecting plate (5) is fixed to the upper end of the first rotating shaft (6), and the first connecting plate (5) is fixedly connected to the left side of the lower end of the main filter element (4); the auxiliary rotating member comprises a second rotating shaft (10), the second rotating shaft (10) is installed in the bottom plate portion (1) of the housing inside the second groove (17), the second rotating shaft (10) is rotatably connected to the bottom plate of the housing (1), a second connecting plate (9) is fixed to the upper end of the second rotating shaft (10), the second connecting plate (9) is located inside the second elastic protection unit, and the second connecting plate (9) is fixedly connected to the left side of the lower end of the auxiliary filter element (8).

4. The hydraulic oil filter assembly according to claim 3, characterized in that: An inner groove is provided in the bottom plate of the housing (1); the lower end of the first rotating shaft (6) is located in the inner groove; the lower end of the second rotating shaft (10) is located in the inner groove; a first gear (7) is concentrically fixed to the lower end of the first rotating shaft (6); a second gear (11) is concentrically fixed to the lower end of the second rotating shaft (10); the first gear (7) and the second gear (11) are connected to each other through a chain (12); the first gear (7), the second gear (11) and the chain (12) are located in the inner groove.

5. The hydraulic oil filter assembly according to claim 1, characterized in that: The limiting assembly comprises a limiting plate (23) and an arc plate (24), the limiting plate (23) being fixed to the upper end of the bottom plate of the housing (1), the limiting plate (23) being arc-shaped, the arc plate (24) being slidably connected to the bottom plate of the housing (1), the arc plate (24) being able to slide in the vertical direction of the bottom plate of the housing (1), the limiting plate (23) and the arc plate (24) being located outside the main filter element (4), the limiting plate (23) and the arc plate (24) being concentric with the main filter element (4), the inner edges of the limiting plate (23) and the inner edges of the arc plate (24) being in contact with the outer edge of the lower end of the main filter element (4), an arc groove (30) being provided on the bottom plate of the housing (1), the arc plate (24) being slidingly sealed and arranged in the arc groove (30), The outer side of the upper end of the arc plate (24) is processed with an arc-shaped guide inclined surface (25); the pressure trigger component comprises a lower groove (31) provided on the bottom plate of the housing (1); the sliding plate (27) is slidingly and sealingly connected in the lower groove (31); a lower spring (28) is arranged in the lower groove (31); the upper end of the lower spring (28) is fixedly connected to the upper end of the sliding plate (27); the lower end of the lower spring (28) is fixedly connected to the bottom plate of the housing (1); the lower groove (31) is connected to the arc groove (30) through a connecting groove (29); a connecting piece (26) is arranged in the connecting groove (29); one end of the connecting piece (26) is fixedly connected to the sliding plate (27); and the other end of the connecting piece (26) is fixedly connected to the arc plate (24).

6. The hydraulic oil filter assembly according to claim 3, characterized in that: The first elastic protection unit comprises a first annular plate (14), the first annular plate (14) is located in the first groove (13), the first rotating shaft (6) is located inside the first annular plate (14), the upper end of the first annular plate (14) is blocked by the lower end of the first connecting plate (5), after the first connecting plate (5) and the main filter element (4) rotate to the inside of the first annular plate (14), the first elastic protection unit extends, the first annular plate (14) is connected to the bottom of the first groove (13) through a plurality of spring telescopic rods (15), the first annular plate (14) is connected to the bottom of the first groove (13) through a first elastic diaphragm sleeve (16), the plurality of spring telescopic rods (15) are located inside the first elastic diaphragm sleeve (16), the upper end of the first elastic diaphragm sleeve (16) is fixedly connected to the first annular plate (14), and the lower end of the first elastic diaphragm sleeve (16) is fixedly connected to the bottom of the first groove (13).

7. The hydraulic oil filter assembly according to claim 3, characterized in that: The second elastic protection unit includes a second annular plate (19), which is sealed and inserted into the annular groove (18) of the top plate of the shell (1). A stopper (22) is fixed on the right side of the upper end of the main filter element (4), and the upper end of the stopper (22) blocks the lower end of the second annular plate (19). The second annular plate (19) is connected to the bottom of the second groove (17) through a plurality of tension spring telescopic rods (20). The second annular plate (19) is connected to the bottom of the second groove (17) through a second elastic diaphragm sleeve (21). The plurality of tension spring telescopic rods (20) are located on the inner side of the second elastic diaphragm sleeve (21). The upper end of the second elastic diaphragm sleeve (21) is fixedly connected to the second annular plate (19), and the lower end of the second elastic diaphragm sleeve (21) is fixedly connected to the bottom of the second groove (17).

8. The hydraulic oil filter assembly according to claim 3, characterized in that: An arc-shaped limiting slot (601) is provided in the bottom plate of the housing (1) outside the first rotating shaft (6), a limiting slider (602) is fixed outside the first rotating shaft (6), the limiting block is slidably arranged in the limiting slot (601), a friction block (603) is embedded and fixed in the slot wall of the limiting slot (601), and during the rotation of the first rotating shaft (6), the limiting slider (602) can slide in contact with the friction block (603).

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