High-efficiency separation precision filter

By using staggered carrier plates and lint-blocking barbs, combined with the mechanical structure of the central pusher and waste-pushing plate, the problem of easy clogging of the filter element is solved, achieving efficient lint filtration and simplified cleaning operations, thus improving the working efficiency and lifespan of the filter.

CN121016364AInactive Publication Date: 2025-11-28YUCHENG YINHAN ENVIRONMENTAL PROTECTION TECH CO LTD
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Patent Information

Application Number
CN202511507200.0
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-10-21
Publication Date
2025-11-28
Estimated Expiration
Not applicable · inactive patent

AI Technical Summary

Technical Problem

Existing precision filters are prone to clogging when filtering flocculent gases, resulting in low filtration efficiency and frequent cleaning, which affects continuous working time.

Method used

By employing a staggered carrier plate structure and a lint-blocking design, combined with a central pusher and a waste-pushing plate mechanical structure, effective interception and automatic cleaning of lint are achieved, simplifying the operation process.

Benefits of technology

It extends the filter cartridge cleaning cycle, improves filtration efficiency, prolongs the continuous working time of the filter, and simplifies the cleaning process.

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Abstract

The invention relates to the field of filtering facilities, in particular to an efficient separation precision filter which comprises a filter shell, a filter element is mounted on one side of the interior of the filter shell, a third carrier plate is fixedly mounted on the side of the filter element in the filter shell, and two second carrier plates are symmetrically and fixedly mounted on the side of the third carrier plate in the filter shell. Two first carrier plates are symmetrically and fixedly installed on the side of the second carrier plate in the device shell, the first carrier plates, the second carrier plates and the third carrier plates are arranged in a staggered mode, a plurality of wadding blocking thorns extend on the first carrier plates, the second carrier plates and the third carrier plates in a linear array mode, and a glue pushing plugging piece is arranged in the device shell. One side of the front end of the device shell fixedly communicates with an air outlet, and the other side of the front end of the device shell fixedly communicates with an air inlet. The filtering efficiency is improved, cleaning is facilitated, meanwhile, the operation process during cleaning is simplified, and use is effectively facilitated.
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Description

Technical Field

[0001] This invention relates to the field of filtration facilities, and more particularly to a precision filter for high-efficiency separation. Background Technology

[0002] Precision filters, also known as security filters, are high-precision filtration devices used to remove solid impurities from air. In some gases containing flocculent solids, such as those containing flocculent matter, flocculent solids are removed during production or experimentation, and this removal process involves filtration through a precision filter.

[0003] However, existing precision filters mostly rely on internal filter elements for filtration. When filtering flocculent gases, the solid flocculent matter in the gas easily adheres to the filter element, causing it to become clogged. This requires frequent cleaning to keep the filter element clear, resulting in a short cleaning cycle and shortening the continuous working time of the filter, which seriously affects its filtration efficiency. Summary of the Invention

[0004] The purpose of this invention is to address the shortcomings of the prior art by proposing a precision filter for high-efficiency separation.

[0005] To achieve the above objectives, the technical solution adopted by the present invention is as follows: a high-efficiency separation precision filter, comprising a housing, a filter element installed on one side of the interior of the housing, a No. 3 carrier plate fixedly installed on the side of the filter element inside the housing, two No. 2 carrier plates symmetrically fixedly installed on the side of the No. 3 carrier plate inside the housing, and two No. 1 carrier plates symmetrically fixedly installed on the side of the No. 2 carrier plates inside the housing, with the No. 1, No. 2, and No. 3 carrier plates arranged in a staggered manner, and each of the No. 1, No. 2, and No. 3 carrier plates has multiple lint-blocking spikes extending linearly in an array. A push-adhesive sealing component is provided inside the housing, an air outlet is fixedly connected to one side of the front end of the housing, an air inlet is fixedly connected to the other side of the front end of the housing, a fixed cover is fixedly installed at one end of the housing, a control valve is fixedly connected to the middle of one side of the fixed cover, and a movable cover is fitted to the other end of the housing. The movable cover, the control valve, and the push-adhesive sealing component are connected.

[0006] Preferably, a sealing groove is provided on the side of the movable cover, and a sealing ring extends coaxially from the other end of the housing. The sealing ring is inserted into the interior of the sealing groove, and an annular rubber pad is fixedly installed on the side of the sealing ring.

[0007] Preferably, the adhesive-sealing component includes a central pusher frame disposed inside the housing, the central pusher frame passing through the filter element and slidingly engaging with the filter element, and waste-pushing plates attached to the sides of the third carrier plate, the second carrier plate, and the first carrier plate, the waste-pushing plates slidingly engaging with the outer surface of the lint trap, a connecting frame fixedly installed between the central pusher frame and the waste-pushing plates, and one end of the central pusher frame being fixed to the movable cover.

[0008] Preferably, a stepped end cap is coaxially arranged behind the air inlet and the air outlet. Two guide columns are symmetrically fixedly installed at the rear end of the stepped end cap. A column guide shell is slidably installed on the outer surface of each of the two guide columns. The end of the column guide shell is fixed to the inner wall of the casing. A pusher frame is embedded between the two guide columns. A control frame is rotatably installed in the middle of the pusher frame. The end of the control frame is rotatably connected to the central pusher frame.

[0009] Preferably, the central pusher passes through the fixed cover and slides with the fixed cover. A square groove cover is embedded on the outer surface of the central pusher. The square groove cover is pressed against the other side of the fixed cover. A sealing frame is inserted into the inside of the square groove cover. The sealing frame is fixed to the other side of the fixed cover. A square rubber pad is fixedly installed on the side of the sealing frame.

[0010] Preferably, a fixed frame is embedded at the other end of the central push frame, an extension frame is fixedly installed at the end of the fixed frame, a push plate frame extends from the end of the extension frame, a connecting sleeve is slidably installed on the outer surface of the push plate frame, a toothed plate is fixedly installed at the lower end of the connecting sleeve, a gear is coaxially fixedly installed at the end of the valve stem of the control valve, the toothed plate meshes with the gear, a second lug extends from the upper edge of the push plate frame, the second lug rests on the connecting sleeve, and a first lug extends from the upper end of the push plate frame away from the second lug.

[0011] Preferably, a support frame is fixedly installed on one side edge of the fixed cover, a threaded rod is rotatably installed at the end of the support frame, the end of the threaded rod is rotatably connected to the fixed cover, a pusher frame is screwed onto the outer surface of the threaded rod, and the end of the pusher frame is fixed to the fixed frame.

[0012] Preferably, the pusher frame has two curved guide frames extending symmetrically from the middle, and the upper and lower ends of the support frame both have T-shaped protrusions extending from them. The ends of the curved guide frames are slidably mounted on the outer surface of the T-shaped protrusions.

[0013] Compared with the prior art, the present invention has the following beneficial effects:

[0014] 1. The staggered arrangement of carrier plates No. 1, No. 2, and No. 3 allows gas to pass smoothly between them. During this passage, the flocculent solids mixed in with the gas will collide with the flocculent barbs under the influence of the airflow, and be pierced by the barbs and remain on them. This intercepts most of the flocculent solids mixed in with the gas, minimizing the amount of flocculent solids adhering to the filter element as the gas passes through, thus delaying the clogging time of the filter element, extending the cleaning cycle, increasing the continuous working time of the filter, and thereby improving the filtration efficiency.

[0015] 2. The moving central pusher can drive the waste-pushing plate towards the tips of the flocculent spikes, pushing down the flocculent solids pierced by the spikes so that they can be subsequently carried out of the vessel shell by the liquid, thus facilitating cleaning. Simultaneously, as the central pusher drives the waste-pushing plate to push down the flocculent solids, it also moves the control frame to push the guide column, allowing it to slide out within the column guide shell. This, in turn, causes the stepped end cap to press against the air inlet and outlet to seal them. At the same time, the central pusher also moves the movable cover to separate from the vessel shell and moves the pusher plate frame to slide within the connecting sleeve. When the first lug on the plate frame abuts against the connecting sleeve, the first lug pushes the connecting sleeve, which in turn moves the toothed plate to drive the gear to rotate, causing the valve stem of the control valve to rotate and open the control valve. This allows liquid to enter through the control valve to backwash the filter element, and the flushed liquid, carrying flocculent solids, is discharged from the movable cover. The process simultaneously completes the sealing of the air inlet and outlet, as well as the opening of the control valve and movable cover, without requiring manual operation. This effectively simplifies the operation process and makes it more convenient to use. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of a precision filter for high-efficiency separation according to the present invention;

[0017] Figure 2 This is an internal view of the housing of a precision filter for high-efficiency separation according to the present invention.

[0018] Figure 3 This is a schematic diagram of the interior of the housing of a precision filter for high-efficiency separation according to the present invention;

[0019] Figure 4 This is a schematic diagram of the stepped end cap of a precision filter for high-efficiency separation according to the present invention;

[0020] Figure 5 This invention relates to a precision filter for high-efficiency separation. Figure 3 Enlarged view of A in the middle;

[0021] Figure 6 This is an exploded view of the housing and movable cover of a precision filter for high-efficiency separation according to the present invention.

[0022] Figure 7 This is a cross-sectional view of the square groove cover of a precision filter for high-efficiency separation according to the present invention;

[0023] Figure 8 This is a schematic diagram of the control valve of a precision filter for high-efficiency separation according to the present invention;

[0024] Figure 9 This is a schematic diagram from another perspective of the control valve of a precision filter for high-efficiency separation according to the present invention;

[0025] Figure 10 This invention relates to a precision filter for high-efficiency separation. Figure 9 A magnified view of B in the middle.

[0026] In the diagram: 1. Housing; 2. Movable cover; 3. Air inlet; 4. Air outlet; 5. Control valve; 6. Filter element; 7. Central pusher; 8. Square groove cover; 9. Fixed cover; 10. Stepped head; 11. Carrier plate No. 1; 12. Carrier plate No. 2; 13. Carrier plate No. 3; 14. Guide column; 15. Pusher frame; 16. Control frame; 17. Column guide shell; 18. Extension frame; 19. Lug No. 1; 20. 21. Push plate frame; 22. Connecting slide sleeve; 23. Toothed plate; 24. No. 2 lug; 25. Fixing frame; 26. Push frame; 27. Gear; 28. Sealing frame; 29. ​​Square rubber pad; 30. Sealing groove; 31. Sealing ring; 32. Annular rubber pad; 33. Connecting frame; 34. Waste push plate; 35. Fluff-blocking spike; 36. Bearing frame; 37. Threaded rod; 38. T-shaped protrusion; 39. Curved guide frame. Detailed Implementation

[0027] The following description is intended to disclose the invention and enable those skilled in the art to implement it. The preferred embodiments described below are merely examples, and other obvious variations will occur to those skilled in the art.

[0028] like Figures 1-10The high-efficiency separation precision filter shown includes a housing 1. A filter element 6 is installed on one side of the interior of the housing 1, serving a filtering function. A third carrier plate 13 is fixedly installed inside the housing 1 to the side of the filter element 6. Two second carrier plates 12 are symmetrically fixedly installed inside the housing 1 to the side of the third carrier plate 13. Two first carrier plates 11 are symmetrically fixedly installed inside the housing 1 to the side of the second carrier plates 12. The first, second, and third carrier plates 13 all serve a filtering function. The first carrier plate 11, the second carrier plate 12, and the third carrier plate 13 are staggered to support the flow of gas, thereby increasing the contact opportunity between the flocculent solids in the gas and the flocculent spikes 34. Multiple flocculent spikes 34 extend linearly from each of the first carrier plate 11, the second carrier plate 12, and the third carrier plate 13. The flocculent solids mixed in the gas are propelled by the airflow and collide with the flocculent spikes 34, being pierced and remaining on them, allowing the gas to... Most of the flocculent solids mixed in are intercepted to minimize the amount of flocculent solids adhering when the gas passes through the filter element 6, thereby delaying the clogging time of the filter element 6, extending the cleaning cycle, and increasing the continuous working time of the filter, thus improving the filtration efficiency. The interior of the housing 1 is equipped with a push-adhesive sealing component. One of the front ends of the housing 1 is fixedly connected to an air outlet 4, which allows gas to be discharged from the housing 1. The other front end of the housing 1 is fixedly connected to an air inlet 3, which allows gas to enter the housing 1. A fixed cover 9 is fixedly installed at one end of the housing 1. A control valve 5 is fixedly connected to the middle of one side of the fixed cover 9. The control valve 5 is connected to an external liquid pipeline. Opening the control valve 5 allows liquid to enter from the control valve 5 to backwash the filter element 6, and the flushed liquid carrying the flocculent solids is discharged from the movable cover 2. The other end of the housing 1 is fitted with a movable cover 2, which is connected to the movable cover 2, the control valve 5, and the push-adhesive sealing component.

[0029] A sealing groove 29 is provided on the side of the movable cover 2, and a sealing ring 30 extends coaxially from the other end of the shell 1. The fit between the sealing groove 29 and the sealing ring 30 can seal the movable cover 2 and the shell 1 to prevent air leakage. The sealing ring 30 is inserted into the inside of the sealing groove 29, and an annular rubber pad 31 is fixedly installed on the side of the sealing ring 30. The annular rubber pad 31 can improve the sealing force of the sealing groove 29 and the sealing ring 30.

[0030] The plugging component includes a central pusher 7 disposed inside the housing 1, which passes through the filter element 6 and slides with it. Pusher plates 33 are attached to the sides of the third carrier plate 13, the second carrier plate 12, and the first carrier plate 11. These pusher plates 33 move towards the tips of the flocculent spikes 34 to push down the flocculent solids pierced by the spikes, facilitating their subsequent discharge from the housing 1 by the liquid. The pusher plates 33 slide against the outside of the flocculent spikes 34. On the surface, a connecting frame 32 is fixedly installed between the central pusher 7 and the waste pusher plate 33. The connecting frame 32 serves to fix the central pusher 7 and the waste pusher plate 33 together. One end of the central pusher 7 is fixed to the movable cover 2. The movement of the central pusher 7 can control the waste pusher plate 33 to push down the flocculent solids, and at the same time complete the sealing of the air inlet 3 and the air outlet 4, as well as the opening of the control valve 5 and the movable cover 2. No one needs to operate them one by one, which effectively simplifies the operation process and makes it convenient to use.

[0031] A stepped end cap 10 is coaxially arranged behind both the air inlet 3 and the air outlet 4. The stepped design of the stepped end cap 10 allows the small-diameter section of the stepped end cap 10 to insert into the air inlet 3 and the air outlet 4 during sealing, and the stepped surface of the stepped end cap 10 to abut against the inner wall of the casing 1, thereby improving the sealing effect. Two guide posts 14 are symmetrically fixedly installed at the rear end of the stepped end cap 10. A guide shell 17 is slidably installed on the outer surface of each guide post 14. The cooperation between the guide post 14 and the guide shell 17 guides the stepped end cap 10. The end of the guide shell 17 is fixed to the inner wall of the shell 1. A pusher frame 15 is embedded between the two guide columns 14. The pusher frame 15 pushes the two guide columns 14 synchronously. A control frame 16 is installed at the middle of the pusher frame 15. The end of the control frame 16 is rotatably connected to the central pusher frame 7. The central pusher frame 7 drives the control frame 16 to move, so as to push the guide columns 14, so that the guide columns 14 can slide out inside the guide shell 17, thereby driving the stepped end cap 10 to press against the air inlet 3 and the air outlet 4 to seal them.

[0032] The central pusher 7 passes through the fixed cover 9 and slides with the fixed cover 9. A square groove cover 8 is inlaid on the outer surface of the central pusher 7. The square groove cover 8 is pressed against the other side of the fixed cover 9. A sealing frame 27 is inserted inside the square groove cover 8. The cooperation between the square groove cover 8 and the sealing frame 27 can seal the space between the central pusher 7 and the fixed cover 9. The sealing frame 27 is fixed to the other side of the fixed cover 9. A square rubber pad 28 is fixedly installed on the side of the sealing frame 27. The square rubber pad 28 can improve the sealing force between the square groove cover 8 and the sealing frame 27.

[0033] A fixing frame 24 is embedded at the other end of the central push frame 7. The fixing frame 24 serves as a connection. An extension frame 18 is fixedly installed at the end of the fixing frame 24. A push plate frame 20 extends from the end of the extension frame 18. The extension frame 18 serves to fix the push plate frame 20. A connecting sleeve 21 is slidably installed on the outer surface of the push plate frame 20. A toothed plate 22 is fixedly installed at the lower end of the connecting sleeve 21. A gear 26 is coaxially fixedly installed at the end of the valve stem of the control valve 5. The toothed plate 22 meshes with the gear 26. A second toothed plate extends from the upper edge of the push plate frame 20. Lug 23, the second lug 23 rests on the connecting sleeve 21, and the upper end of the push plate frame 20 extends away from the second lug 23 with a first lug 19. The sliding design of the push plate frame 20 and the connecting sleeve 21, as well as the design of the second lug 23 and the first lug 19, allow the central push frame 7 to move a certain distance, and then push the toothed plate 22 on the connecting sleeve 21 to move through the second lug 23 or the first lug 19 to open or close the control valve 5. This avoids the phenomenon of mutual obstruction due to the different moving distances of the central push frame 7 and the toothed plate 22.

[0034] A support frame 35 is fixedly installed on one side edge of the fixed cover 9. A threaded rod 36 is rotatably installed at the end of the support frame 35. The support frame 35 serves to support the threaded rod 36. The end of the threaded rod 36 is rotatably connected to the fixed cover 9. A pusher frame 25 is screwed onto the outer surface of the threaded rod 36. The threaded rod 36 serves to drive the pusher frame 25 to move. The end of the pusher frame 25 is fixed to the fixed frame 24.

[0035] Two curved guide frames 38 extend symmetrically from the middle of the propulsion frame 25. T-shaped protrusions 37 extend from both the upper and lower ends of the support frame 35. The ends of the curved guide frames 38 are slidably mounted on the outer surface of the T-shaped protrusions 37. The cooperation between the curved guide frames 38 and the T-shaped protrusions 37 serves to guide the propulsion frame 25.

[0036] In use, gas enters the housing 1 through the inlet 3. The gas then passes between the staggered carrier plates 11, 12, and 13. During this passage, the flocculent solids mixed in the gas are propelled by the airflow and strike the bristle-blocking spikes 34, where they are pierced and remain. This process intercepts most of the flocculent solids in the gas. The gas then passes through the filter element 6, which removes all the flocculent solids. The gas is then completely filtered out. The air is discharged from outlet 4. When cleaning is required, the threaded rod 36 can be rotated, which in turn drives the pusher frame 25 to move. At this time, the curved guide frame 38 slides on the T-shaped protrusion 37 to guide the pusher frame 25. The moving pusher frame 25 pushes the central pusher frame 7 on the fixed frame 24 to move, which in turn drives the waste pusher plate 33 to move towards the tip of the lint-blocking barb 34, so as to push down the lint-like solids pierced on the lint-blocking barb 34 and let them fall to the bottom of the shell 1. At the same time, the central pusher frame 7 will also drive the control frame 16 to move. This pushes the guide post 14, allowing it to slide out of the guide shell 17, thereby causing the stepped end cap 10 to press against the air inlet 3 and the air outlet 4 to seal them. Simultaneously, the central pusher 7 moves the movable cover 2 to separate from the shell 1, and moves the push plate frame 20 to slide within the connecting sleeve 21. When the first lug 19 on the push plate frame 20 abuts against the connecting sleeve 21, the first lug 19 pushes the connecting sleeve 21, thereby moving the toothed plate 22 to push... The rotation of gear 26 causes the valve stem of control valve 5 to rotate, thereby opening control valve 5 and allowing liquid to enter through control valve 5 to backwash filter element 6. The flushed liquid, carrying flocculent solids, is then discharged from movable cover 2. During this process, the control push plate 33 pushes the flocculent solids down, simultaneously sealing the air inlet 3 and air outlet 4, as well as opening control valve 5 and movable cover 2. This simplifies the operation process and makes the product more convenient to use, eliminating the need for manual operation.

[0037] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed invention. The scope of protection claimed by the appended claims and their equivalents is defined.

Claims

1. A precision filter for high-efficiency separation, comprising a housing (1), characterized in that: A filter element (6) is installed on one side of the interior of the housing (1). A third carrier plate (13) is fixedly installed inside the housing (1) on the side of the filter element (6). Two second carrier plates (12) are symmetrically fixedly installed inside the housing (1) on the side of the third carrier plate (13). Two first carrier plates (11) are symmetrically fixedly installed inside the housing (1) on the side of the second carrier plate (12). The first carrier plate (11), the second carrier plate (12), and the third carrier plate (13) are arranged in a staggered manner. The first carrier plate (11) and the second carrier plate (12) are... Multiple barbs (34) are linearly extended on the No. 3 carrier plate (13). A push-adhesive sealing component is provided inside the shell (1). An air outlet (4) is fixedly connected to one side of the front end of the shell (1), and an air inlet (3) is fixedly connected to the other side of the front end of the shell (1). A fixed cover (9) is fixedly installed at one end of the shell (1). A control valve (5) is fixedly connected to the middle of one side of the fixed cover (9). A movable cover (2) is fitted to the other end of the shell (1). The movable cover (2), the control valve (5) and the push-adhesive sealing component are connected.

2. The precision filter for high-efficiency separation according to claim 1, characterized in that: The movable cover (2) has a sealing groove (29) on its side, and a sealing ring (30) extends coaxially from the other end of the housing (1). The sealing ring (30) is inserted into the sealing groove (29), and an annular rubber pad (31) is fixedly installed on the side of the sealing ring (30).

3. The precision filter for high-efficiency separation according to claim 1, characterized in that: The push-sealing component includes a central push frame (7) disposed inside the housing (1). The central push frame (7) passes through the filter element (6) and slides with the filter element (6). The side of the third carrier plate (13), the side of the second carrier plate (12), and the side of the first carrier plate (11) are all fitted with waste push plates (33). The waste push plates (33) slide against the outer surface of the lint trap (34). A connecting frame (32) is fixedly installed between the central push frame (7) and the waste push plates (33). One end of the central push frame (7) is fixed to the movable cover (2).

4. The precision filter for high-efficiency separation according to claim 3, characterized in that: A stepped end cap (10) is coaxially arranged behind the air inlet (3) and the air outlet (4). Two guide columns (14) are symmetrically fixedly installed at the rear end of the stepped end cap (10). A column guide shell (17) is slidably installed on the outer surface of the two guide columns (14). The end of the column guide shell (17) is fixed to the inner wall of the shell (1). A pusher frame (15) is embedded between the two guide columns (14). A control frame (16) is tilted and rotated in the middle of the pusher frame (15). The end of the control frame (16) is rotatably connected to the central pusher frame (7).

5. The precision filter for high-efficiency separation according to claim 3, characterized in that: The central pusher (7) passes through the fixed cover (9) and slides with the fixed cover (9). The outer surface of the central pusher (7) is inlaid with a square groove cover (8). The square groove cover (8) is pressed against the other side of the fixed cover (9). A sealing frame (27) is inserted inside the square groove cover (8). The sealing frame (27) is fixed to the other side of the fixed cover (9). A square rubber pad (28) is fixedly installed on the side of the sealing frame (27).

6. The precision filter for high-efficiency separation according to claim 3, characterized in that: The other end of the central push frame (7) is inlaid with a fixed frame (24). The end of the fixed frame (24) is fixedly installed with an extension frame (18). The end of the extension frame (18) extends with a push plate frame (20). The outer surface of the push plate frame (20) is slidably installed with a connecting sleeve (21). The lower end of the connecting sleeve (21) is fixedly installed with a toothed plate (22). The valve stem end of the control valve (5) is coaxially fixedly installed with a gear (26). The toothed plate (22) meshes with the gear (26). The upper edge of the push plate frame (20) extends with a second lug (23). The second lug (23) rests on the connecting sleeve (21). The upper end of the push plate frame (20) extends with a first lug (19) away from the second lug (23).

7. The precision filter for high-efficiency separation according to claim 6, characterized in that: A support frame (35) is fixedly installed on one side edge of the fixed cover (9). A threaded rod (36) is rotatably installed at the end of the support frame (35). The end of the threaded rod (36) is rotatably connected to the fixed cover (9). A pusher frame (25) is screwed onto the outer surface of the threaded rod (36). The end of the pusher frame (25) is fixed to the fixed frame (24).

8. The precision filter for high-efficiency separation according to claim 7, characterized in that: The middle part of the propulsion frame (25) has two curved guide frames (38) extending symmetrically. The upper and lower ends of the bearing frame (35) are both extended with T-shaped protrusions (37). The ends of the curved guide frames (38) are slidably installed on the outer surface of the T-shaped protrusions (37).