Hydraulic oil filter assembly

Abstract

The present application relates to the technical field of oil filtering, in particular to a hydraulic oil filter assembly. The hydraulic oil filter assembly comprises a shell, an inlet pipe and an outlet pipe are fixedly connected to the upper end of the shell, a main filter element is slidably arranged in the shell below the outlet pipe, the outlet pipe is in communication with the inside of the main filter element, the lower end of the main filter element is elastically connected to the lower end of the shell through a main rotating part at the left side, a secondary filter element is slidably arranged in the shell at the right side of the main filter element, the lower end of the secondary filter element is rotatably connected to the bottom plate of the shell through a secondary rotating part at the left side, and the main rotating part is in transmission connection with the secondary rotating part. The filter completely utilizes system pressure energy and mechanical energy storage to drive switching action, without external power supply or hydraulic circuit modification.

Description

Technical Field

[0001] This invention relates to the field of oil filtration technology, specifically to hydraulic oil filter assemblies. Background Technology

[0002] As the core power transmission carrier of modern industrial equipment, the reliability of hydraulic systems directly depends on the cleanliness of hydraulic oil. Hydraulic oil filters, as a key component in oil contamination control, play a crucial role in intercepting solid particles and preventing wear on system components. Traditional filters generally use a single filter element structure. When the filter element experiences increased pressure differential due to contaminant buildup, the system must be shut down for manual replacement or cleaning. This process not only interrupts equipment operation and reduces production efficiency but also introduces the risk of secondary contamination during replacement. Especially in high-precision hydraulic equipment or continuous production lines, frequent maintenance significantly increases operating costs and safety hazards.

[0003] While some existing technologies attempt to implement dual-filter redundancy designs, their switching mechanisms often rely on external electronic control or manual operation, resulting in complex structures and slow response times. More critically, clogged filter elements are immersed in oil for extended periods before replacement, and accumulated contaminants may be dislodged by vibration or oil flow, creating secondary contamination sources. Furthermore, mechanical switching mechanisms frequently face issues such as motion interference, seal failure, or unreliable operation, especially under high-pressure conditions, where dynamic sealing and precise positioning during filter element rotation become technical bottlenecks. Achieving automatic detection of filter element clogging, uninterrupted switching, and physical isolation of clogged filter elements, while ensuring smooth switching and structural sealing, has become a pressing technical challenge in the field of hydraulic filtration. Summary of the Invention

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

[0005] To achieve the above objectives, the technical solution provided by this invention is as follows:

[0006] The hydraulic oil filter assembly includes a housing. An inlet pipe and an outlet pipe are fixedly connected to the upper end of the housing. A main filter element is slidably disposed within the housing below the outlet pipe. The outlet pipe communicates with the interior of the main filter element. The lower left side of the main filter element is elastically rotatably connected to the lower end of the housing via a main rotating component. A secondary filter element is slidably disposed within the housing on the right side of the main filter element. The lower left side of the secondary filter element is rotatably connected to the housing base plate via a secondary rotating component. The main rotating component and the secondary rotating component are drively connected. A limit assembly is provided on the outer side of the lower end of the main filter element. A pressure trigger assembly is provided at the lower end of the housing. The pressure trigger assembly is connected to the limit assembly. The lower left side of the housing... A first elastic protective unit with an annular shape is provided. A first annular groove is opened in the lower end of the housing. The first elastic protective unit is compressed in the first groove. The main rotating component blocks the upper end of the first elastic protective unit. A second annular groove is opened in the lower end of the housing on the right side of the main filter element. A second annular elastic protective unit is installed in the second groove. The auxiliary filter element is located in the second elastic protective unit. The lower end of the second elastic protective unit is fixedly sealed in the second groove. The upper end of the second elastic protective unit is in sealed contact with the top plate of the housing. The second elastic protective unit is stretched. The upper right side of the main filter element limits the upper end of the second elastic protective unit.

[0007] After the pressure inside the housing increases, the pressure trigger component activates and links with the limiting component. After the limiting component activates, it loses its limiting effect on the main filter element. Then, the main rotating component causes the main filter element to rotate, and the main rotating component causes the secondary filter element to rotate. After the main filter element rotates, it loses its limiting effect on the upper end of the second elastic protection unit. 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 secondary filter element. After the main filter element rotates to the inside of the first groove, the main rotating component loses its limiting effect on the first elastic protection unit. After the first elastic protection unit extends, its upper end makes sealing contact with the top plate of the housing. At this time, the secondary filter element rotates to below the outlet pipe, and the outlet pipe communicates with the interior of the secondary filter element. The limiting component limits the lower end of the secondary filter element.

[0008] Specifically, the upper and lower ends of the main filter element are in sliding and sealed contact with the top and bottom plates of the housing, respectively, and the upper and lower ends of the auxiliary filter element are in sliding and sealed contact with the top and bottom plates of the housing, respectively.

[0009] Specifically, the main rotating component includes a first rotating shaft, which is rotatably connected to the bottom plate of the housing. The first rotating shaft and the bottom plate of the housing are connected by 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 lower left side of the main filter element. The auxiliary rotating component includes a second rotating shaft, which is installed in the bottom plate portion of the housing inside the second groove. The second rotating shaft is rotatably connected to the bottom plate of the housing. A second connecting plate is fixed to the upper end of the second rotating shaft. The second connecting plate is located inside the second elastic protection unit, and the second connecting plate is fixedly connected to the lower left side of the auxiliary filter element.

[0010] Specifically, an inner groove is provided in the bottom plate of the housing. The lower end of the first rotating shaft is located in the inner groove, and the lower end of the second rotating shaft is located in the inner groove. A first gear is concentrically fixed at the lower end of the first rotating shaft, and a second gear is concentrically fixed at the lower end of the second rotating shaft. The first gear and the second gear are connected by a chain drive. The first gear, the second gear, and the chain are located in the inner groove.

[0011] Specifically, the limiting component includes a limiting plate and an arc-shaped plate. The limiting plate is fixed to the upper end of the housing bottom plate. The limiting plate is arc-shaped and slidably connected to the housing bottom plate. The arc-shaped plate can slide in the vertical direction of the housing bottom plate. The limiting plate and the arc-shaped plate are located outside the main filter element and are concentric with the main filter element. The inner edges of the limiting plate and the arc-shaped plate are in contact with the lower outer edge of the main filter element. An arc-shaped groove is provided on the housing bottom plate. The arc-shaped plate is slidably sealed in the arc-shaped groove. An arc-shaped guide slope is machined on the outer side of the upper end of the arc-shaped plate. The pressure triggering component includes a lower groove on the housing bottom plate. A sliding plate is slidably sealed in the lower groove. A lower spring is provided in the lower groove. The upper end of the lower spring is fixedly connected to the upper end of the sliding plate, and the lower end of the lower spring is fixedly connected to the housing bottom plate. The lower groove and the arc-shaped groove are connected by a connecting groove. A connecting piece is provided in the connecting groove. One end of the connecting piece is fixedly connected to the sliding plate, and the other end of the connecting piece is fixedly connected to the arc-shaped plate.

[0012] Specifically, the first elastic protection unit includes a first annular plate located inside a first groove. A first rotating shaft is located inside the first annular plate. The upper end of the first annular plate is blocked by the lower end of a 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. The multiple spring telescopic rods are located inside 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.

[0013] Specifically, the second elastic protection unit includes a second annular plate, which is sealed and inserted into the annular groove of the top plate of the housing. A stop block is fixed on the upper right side of the main filter element, and the upper end of the stop block 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. The multiple tension spring telescopic rods are located inside 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.

[0014] Specifically, an arc-shaped limiting groove is provided in the bottom plate of the housing on the outer side of the first rotating shaft. A limiting slider is fixed on the outer side of the first rotating shaft. The limiting block is slidably disposed in the limiting groove. 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.

[0015] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0016] 1. The main filter element's blockage status is automatically detected by changes in hydraulic pressure within the housing. This triggers the pressure-activated component to release the limit switch, achieving integrated fault self-diagnosis and action triggering. The main and auxiliary rotating components are rigidly driven by a gear chain, ensuring the main and auxiliary filter elements rotate 180° at the same speed and in the same direction. This allows the auxiliary filter element to precisely shift to the position below the outlet pipe for filtration, eliminating the need for machine shutdown or manual intervention during the entire switching process.

[0017] 2. When the main filter element is switched to the standby position, the first elastic protective unit automatically extends to form a full-circumferential physical barrier, completely sealing and isolating the clogged filter element and blocking the path of impurities. In the initial state, the second elastic protective unit wraps around the auxiliary filter element to prevent it from contacting the hydraulic oil.

[0018] 3. The sliding contact design between the limiting slider and the friction block actively reduces speed during the critical period when the stop block disengages from the second annular plate, ensuring that the second elastic protection unit fully retracts and eliminating motion interference between the secondary filter element and the second elastic protection unit. When the arc-shaped plate guide slope contacts the secondary filter element, it drives the arc-shaped plate to temporarily move downward. After the secondary filter element is in place, the arc-shaped plate automatically resets and locks, limiting the movement of the secondary filter element and ensuring its stable performance.

[0019] 4. This filter fully utilizes system pressure energy and mechanical energy storage to drive the switching action, without the need for external power supply or hydraulic circuit modification. Attached Figure Description

[0020] Figure 1 This is a cross-sectional view of the present invention.

[0021] Figure 2 This is a schematic diagram showing the connection between the pressure trigger component and the limit component via an arc-shaped plate.

[0022] Figure 3 This is a schematic diagram of the limit component.

[0023] Figure 4 This is a schematic diagram of the first and second elastic protection units in their initial state.

[0024] Figure 5 This is a schematic diagram showing how the stop block limits the movement of the second annular plate.

[0025] Figure 6 This is a schematic diagram showing the limit slider located within the limit groove.

[0026] The components in the attached diagram are named as follows: 1. Housing; 2. Inlet pipe; 3. Outlet pipe; 4. Main filter element; 5. First connecting plate; 6. First rotating shaft; 601. Limiting groove; 602. Limiting slider; 603. Friction block; 7. First gear; 8. Secondary 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 Implementation

[0027] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0028] 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 disposed inside the housing 1 below the outlet pipe 3. The outlet pipe 3 is in communication with the interior of the main filter element 4. The upper and lower ends of the main filter element 4 are in sliding sealing contact with the top plate and bottom plate of the housing 1, respectively.

[0029] The lower left end of the main filter element 4 is elastically rotatably connected to the lower end of the housing 1 via a main rotating component. A secondary filter element 8 is slidably disposed inside the housing 1 on the right side of the main filter element 4. The upper and lower ends of the secondary filter element 8 are in sliding, sealed contact with the top and bottom plates of the housing 1, respectively. The lower left end of the secondary filter element 8 is rotatably connected to the bottom plate of the housing 1 via a secondary rotating component. The main rotating component and the secondary rotating component are connected by a transmission mechanism.

[0030] The main rotating component includes a first rotating shaft 6, which 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 by 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 lower left side of the main filter element 4.

[0031] The auxiliary rotating component includes a second rotating shaft 10, which is installed in the bottom plate portion of the housing 1 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 is fixedly connected to the lower left side of the auxiliary filter element 8.

[0032] 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, and 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, and 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. The first gear 7, the second gear 11 and the chain 12 are located in the inner groove.

[0033] A limit component is provided on the outer side of the lower end of the main filter element 4, and a pressure trigger component is provided on the lower end of the housing 1. The pressure trigger component is connected to the limit component.

[0034] 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 housing 1. The limiting plate 23 is arc-shaped. The arc plate 24 is slidably connected to the bottom plate of the housing 1. The arc plate 24 can slide in the vertical direction of the bottom plate of the housing 1. The limiting plate 23 and the arc plate 24 are located outside 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 lower outer edge of the main filter element 4. An arc groove 30 is opened on the bottom plate of the housing 1. The arc plate 24 is slidably sealed in the arc groove 30. An arc-shaped guide slope 25 is machined on the outer side of the upper end of the arc plate 24.

[0035] The pressure triggering assembly includes a lower groove 31 formed on the bottom plate of the housing 1. A sliding plate 27 is slidably and sealingly connected in the lower groove 31. A lower spring 28 is provided 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, and the lower end of the lower spring 28 is fixedly connected to the bottom plate of the housing 1. The lower groove 31 and the arc-shaped groove 30 are connected through a connecting groove 29. A connector 26 is provided in the connecting groove 29. One end of the connector 26 is fixedly connected to the sliding plate 27, and the other end of the connector 26 is fixedly connected to the arc plate 24.

[0036] The lower end of the housing 1 on the left side of the main filter element 4 is provided with an annular first elastic protective unit. An annular first groove 13 is opened in the lower end of the housing 1. The first elastic protective unit is compressed in the first groove 13. The main rotating component blocks the upper end of the first elastic protective unit.

[0037] An annular second groove 17 is provided in the lower end of the housing 1 on the right side of the main filter element 4. An annular second 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 sealed contact with the top plate of the housing 1. The second elastic protective unit is stretched, and the upper right side of the main filter element 4 limits the upper end of the second elastic protective unit.

[0038] The first elastic protective unit includes a first annular plate 14, which is located within a first groove 13. A first rotating shaft 6 is located inside the first annular plate 14, and the upper end of the first annular plate 14 is blocked by the lower end of a 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 protective unit extends.

[0039] The bottom of the first annular plate 14 and the first groove 13 are connected by multiple spring telescopic rods 15. The bottom of the first annular plate 14 and the first groove 13 are connected by a first elastic diaphragm sleeve 16. The multiple 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.

[0040] The second elastic protective unit includes a second annular plate 19, which is sealed and inserted into the annular groove 18 of the top plate of the housing 1. A stop block 22 is fixed to the upper right side of the main filter element 4, and the upper end of the stop block 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 by multiple tension spring telescopic rods 20. The second annular plate 19 is also connected to the bottom of the second groove 17 by 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.

[0041] After the pressure inside the housing 1 increases, the pressure trigger component activates and activates the limiting component. The limiting component then loses its limiting effect on the main filter element 4. The main rotating component then causes the main filter element 4 to rotate, which in turn causes the secondary filter element 8 to rotate via the secondary rotating component. 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. Once retracted into the second groove 17, the second elastic protective unit no longer obstructs the rotation of the secondary filter element 8. After the main filter element 4 rotates to the inside of the first groove 13, the main rotating component loses its limiting effect on the first elastic protective unit. The first elastic protective unit extends, and its upper end makes sealing contact with the top plate of the housing 1. At this time, the secondary filter element 8 rotates to below the outlet pipe 3, and the outlet pipe 3 communicates with the interior of the secondary filter element 8. The limiting component then limits the lower end of the secondary filter element 8.

[0042] In the initial state, the main filter element 4 is connected to the outlet pipe 3, and the torsion spring connecting the first rotating shaft 6 and the housing 1 is in a stored state; the main filter element 4 is in a non-rotatable state under the limiting action of the limiting plate 23 and the arc plate 24. At this time, the multiple spring telescopic rods 15 are in a compressed state, the first annular plate 14 has an upward tendency, but the first annular plate 14 is blocked by the first connecting plate 5; the first elastic diaphragm sleeve 16 is located in the first groove 13.

[0043] The second annular plate 19 is located inside the annular groove 18. 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 stop block 22. The second elastic diaphragm sleeve 21 is stretched and located outside the auxiliary filter element 8. The hydraulic oil in the housing 1 does not contact the auxiliary filter element 8.

[0044] During use, hydraulic oil enters the housing 1 through the inlet pipe 2, and is discharged from the outlet pipe 3 after being filtered by the main filter element 4.

[0045] When the main filter element 4 becomes clogged, the pressure inside the housing 1 increases. Under the pressure of the hydraulic pressure inside the housing 1, the sliding plate 27 overcomes the elasticity of the lower spring 28 and moves downward. The sliding plate 27 drives the arc-shaped plate 24 to move downward through the connecting piece 26. After the upper end of the arc-shaped plate 24 enters the arc-shaped groove 30, the main filter element 4 is no longer limited by the arc-shaped plate 24. Under the elastic force of the torsion spring, the first rotating shaft 6 drives the main filter element 4 to rotate counterclockwise through the first connecting plate 5. At the same time, the first rotating shaft 6 drives the second rotating shaft 10 to rotate through the first gear 7, chain 12 and second gear 11. The second rotating shaft 10 drives the auxiliary filter element 8 to rotate through the second connecting plate 9. That is, the main filter element 4 and the auxiliary filter element 8 will rotate in the same direction and at the same speed.

[0046] After the stop block 22 separates from the second annular plate 19, the second annular plate 19 is no longer blocked by the stop block 22. Under the pulling force 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 protective unit will not block the rotation of the auxiliary filter element 8.

[0047] After the main filter element 4 and the auxiliary filter element 8 rotate 180 degrees from 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 makes 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 internally connected to the auxiliary filter element 8.

[0048] During the rotation of the main filter element 4 and the auxiliary filter element 8, when the main filter element 4 is above the arc plate 24, the main filter element 4 is misaligned with the outlet pipe 3, the pressure inside the housing 1 is restored, and the sliding plate 27, the connecting piece 26 and the arc plate 24 tend to move upward under the elastic action of the lower spring 28. Since the main filter element 4 is above the arc plate 24, the arc plate 24 will be blocked and cannot move upward. After the main filter element 4 and the arc plate 24 are misaligned, the arc plate 24, the connecting piece 26 and the sliding plate 27 move upward and reset under the elastic action of the lower spring 28. Afterwards, when the secondary filter element 8 comes into contact with the guide slope 25 of the arc plate 24, under the rotation of the secondary 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 move downward against the elasticity of the lower spring 28. After the secondary filter element 8 comes into contact with the limiting plate 23, the main filter element 4 and the secondary filter element 8 stop moving. At this time, the secondary filter element 8 no longer presses against 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 secondary filter element 8 is in a non-rotatable state under the limiting action of the limiting plate 23 and the arc plate 24.

[0049] During the process of filtering 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, thus preventing impurities on the main filter element 4 from falling off and mixing with the hydraulic oil.

[0050] An arc-shaped limiting groove 601 is provided in the bottom plate of the housing 1 on the outer side of the first rotating shaft 6. A limiting slider 602 is fixed on the outer side of the first rotating shaft 6. The limiting block is slidably disposed in the limiting groove 601. 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.

[0051] When the first rotating shaft 6 rotates, it drives the limiting slider 602 to slide within the limiting groove 601. When the limiting slider 602 contacts the friction block 603, the main filter element 4 drives the stop block 22 to rotate and disengage from the second annular plate 19. During the time that the limiting slider 602 and the friction block 603 are in sliding contact, the rotation speed of the first rotating shaft 6 slows down, thereby slowing down the rotation speed of the main 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.

[0052] 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 within the protection scope 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), characterized in that, A main filter element (4) is slidably disposed inside the housing (1) below the outlet pipe (3). The outlet pipe (3) is connected to the inside of the main filter element (4). The lower left side of the main filter element (4) is elastically rotatably connected to the lower end of the housing (1) through a main rotating component. A secondary filter element (8) is slidably disposed inside the housing (1) on the right side of the main filter element (4). The lower left side of the secondary filter element (8) is rotatably connected to the bottom plate of the housing (1) through a secondary rotating component. The main rotating component and the secondary rotating component are connected by transmission. A limit component is provided on the outer side of the lower end of the main filter element (4). A pressure trigger component is provided at the lower end of the housing (1). The pressure trigger component is connected to the limit component. A first annular ring is provided at the lower end of the housing (1) on the left side of the main filter element (4). The elastic protective unit has an annular first groove (13) in the lower end of the housing (1). The first elastic protective unit is compressed in the first groove (13). The main rotating part blocks the upper end of the first elastic protective unit. The annular second groove (17) is in the lower end of the housing (1) on the right side of the main filter element (4). An annular second 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 sealed contact with the top plate of the housing (1). The second elastic protective unit is stretched. The upper right side of the main filter element (4) is against the upper end of the second elastic protective unit. Limiting; the main rotating component includes a first rotating shaft (6), which 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) by a torsion spring. A first connecting plate (5) is fixed at the upper end of the first rotating shaft (6), and the first connecting plate (5) is fixedly connected to the lower left side of the main filter element (4). The auxiliary rotating component includes a second rotating shaft (10), which is installed in the bottom plate part of the housing (1) 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 at the upper end of the second rotating shaft (10). The second connecting plate (9) is located inside the second elastic protective unit. The plate (9) is fixedly connected to the lower left side of the auxiliary filter element (8); an arc groove (30) is provided on the bottom plate of the housing (1), and the arc plate (24) is slidably sealed in the arc groove (30); the pressure triggering component includes a lower groove (31) opened on the bottom plate of the housing (1), a sliding plate (27) is slidably sealed in the lower groove (31), a lower spring (28) is provided in the lower groove (31), the lower groove (31) and the arc groove (30) are connected through a connecting groove (29), a connector (26) is provided in the connecting groove (29), one end of the connector (26) is fixedly connected to the sliding plate (27), and the other end of the connector (26) is fixedly connected to the arc plate (24);The first elastic protection unit includes a first annular plate (14), which is located inside the first groove (13). A 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) by multiple spring telescopic rods (15). The first annular plate (14) is connected to the bottom of the first groove (13) by a first elastic diaphragm sleeve (16). The multiple 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). The lower end is fixedly connected to the bottom of the first groove (13); the second elastic protective unit includes a second annular plate (19), which is sealed and inserted into the annular groove (18) of the top plate of the housing (1). A stop block (22) is fixed on the right side of the upper end of the main filter element (4). The upper end of the stop block (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) by multiple tension spring telescopic rods (20). The second annular plate (19) is connected to the bottom of the second groove (17) by 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).

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 sealed contact with the top plate and bottom plate of the housing (1), respectively, and the upper and lower ends of the auxiliary filter element (8) are in sliding and sealed 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 bottom plate of the housing (1) has an inner groove. The lower end of the first rotating shaft (6) is located in the inner groove, and 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), and 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). The first gear (7), the second gear (11) and the chain (12) are located in the inner groove.

4. The hydraulic oil filter assembly according to claim 1, characterized in that, The limiting assembly includes a limiting plate (23) and an arc plate (24). The limiting plate (23) is fixed on the upper end of the bottom plate of the housing (1). The limiting plate (23) is arc-shaped. The arc plate (24) is slidably connected to the bottom plate of the housing (1). The arc plate (24) can slide in the vertical direction of the bottom plate of the housing (1). The limiting plate (23) and the arc plate (24) are located outside 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 lower outer edge of the main filter element (4). An arc-shaped guide slope (25) is machined on the upper outer side of the arc plate (24). 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).

5. The hydraulic oil filter assembly according to claim 1, characterized in that, An arc-shaped limiting groove (601) is provided in the bottom plate of the housing (1) on the outer side of the first rotating shaft (6). A limiting slider (602) is fixed on the outer side of the first rotating shaft (6). The limiting block is slidably arranged in the limiting groove (601). 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).

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