A sewage treatment tank with filter plates that are easily replaced

Abstract

This invention relates to the field of wastewater treatment tank technology, specifically disclosing a wastewater treatment tank with convenient filter plate replacement, comprising: a treatment tank, a water guide shell fixedly connected to one side of the treatment tank, guide rails fixedly connected to both sides of the water guide shell, a movable component slidably connected to the guide rails, a rotating shaft rotatably connected to the movable component, and a connecting frame fixedly connected between the two rotating shafts; a filter plate, detachably connected to the connecting frame, the filter plate having a limiting component, a limiting frame slidably connected inside the water guide shell, the limiting frame being fixedly connected to the movable component, two limiting shells slidably connected to the connecting frame, the limiting shells limiting the limiting component; and a limiting mechanism disposed on the movable component. When the pressure difference across the filter plate increases due to blockage, the limiting mechanism is automatically triggered to release, and the filter plate flips upward under the action of a torsion spring, carrying the trapped impurities to the water surface, which not only improves the working environment but also reduces maintenance frequency and labor intensity.

Description

Technical Field

[0001] This invention relates to the field of wastewater treatment tank technology, and more specifically, to a wastewater treatment tank with easily replaceable filter plates. Background Technology

[0002] With the acceleration of urbanization, population concentration, and continuous growth in water demand, the amount of domestic sewage generated has surged, making sewage treatment a key challenge to the carrying capacity of the urban environment. To prevent the direct discharge of sewage and its damage to the natural ecosystem, it must be effectively purified to meet environmental standards before being discharged. In this purification process, sewage treatment ponds are a crucial basic treatment unit.

[0003] Although existing wastewater treatment ponds employ multi-stage filtration to improve impurity removal, the filter plates cannot be rotated and therefore require regular manual cleaning of accumulated impurities. If cleaning is not timely, filter plate clogging will worsen, potentially leading to water flow obstruction or even wastewater overflow, affecting treatment continuity and increasing operational risks.

[0004] Furthermore, the filter plates in the treatment tank are constantly submerged in sewage. When the filtration efficiency decreases and they need to be disassembled and cleaned, operators must go deep into the sewage to perform the work, which is cumbersome and the working environment is harsh. What's more inconvenient is that during the disassembly process, the impurities trapped on the front side of the filter plates will diffuse with the water flow and cannot be carried to the surface by the filter plates, causing the impurities to re-enter the tank, resulting in secondary pollution and seriously affecting the treatment efficiency.

[0005] In view of this, we propose a wastewater treatment tank with easy filter plate replacement. Summary of the Invention

[0006] (a) Technical problems to be solved To address the problems existing in the prior art, the present invention provides a wastewater treatment tank with convenient filter plate replacement, thereby solving the technical problem mentioned in the background art that although existing treatment tanks can achieve multi-stage filtration, they cannot allow filter plates to be used alternately, resulting in frequent inspections and cleaning by staff.

[0007] (II) Technical Solution To achieve the above objectives, the present invention provides the following technical solution: a sewage treatment tank with convenient filter plate replacement, comprising: a treatment tank, a water guide shell fixedly connected to one side of the treatment tank, guide rails fixedly connected to both sides of the water guide shell, a movable component slidably connected to the guide rails, a rotating shaft rotatably connected to the movable component, and a connecting frame fixedly connected between the two rotating shafts. Filter plate one is detachably connected to the connecting frame. Filter plate one is provided with a limiting component. A limiting frame is slidably connected inside the water guide shell. The limiting frame is fixedly connected to the moving component. The connecting frame is slidably connected to two limiting shells. The limiting shells limit the limiting component. A limiting mechanism is provided on the moving part, and the limiting mechanism limits the rotation shaft so that the filter plate and the connecting frame are in a vertical state; A secondary filtration mechanism is installed inside the water guide shell, which performs secondary interception of impurities in the wastewater.

[0008] Furthermore, the rotating shaft is fixedly connected to a fixing plate, and a crossbeam is fixedly connected between the two fixing plates. A sliding frame is slidably connected to the crossbeam, and a hinge rod is hinged between the sliding frame and the two limiting shells. A spring is fixedly connected between the sliding frame and the crossbeam. A long strip-shaped slot is provided on the lower side of the connecting frame, and the lower side of the filter plate is located in the long strip-shaped slot of the connecting frame.

[0009] Furthermore, a torsion spring is fixedly connected between the fixed plate and the moving part, and connecting plates are fixedly connected to both sides of the water guide shell. A fixed rod is slidably connected to the connecting plate, and the fixed rod is fixedly connected to the moving part on the same side. A second spring is fixedly connected between the fixed rod and the connecting plate.

[0010] Furthermore, the movable component is fixedly connected to a fixing block, and the fixing plate is fixedly connected to a limiting block, with the fixing block limiting the limiting block.

[0011] Furthermore, the limiting mechanism includes: There are two support plates, which are respectively fixed to the two moving parts. The support plates are splined to limit posts. The rotating shaft is provided with blind holes, and the limit posts are located in the blind holes of the rotating shaft. Rack 1 is fixedly connected to the limiting post, and the support plate is rotatably connected to a gear via a bracket, with rack 1 meshing with the gear; An unlocking component is provided on the support plate, which removes the limiting post from the blind hole of the rotating shaft.

[0012] Furthermore, the unlocking component includes: Rack 2 is slidably connected to the support plate, and rack 2 meshes with the gear. The lower end of rack 2 is arc-shaped. A second fixing plate is fixedly connected to the second rack, and a third spring is fixedly connected between the second fixing plate and the support plate; Two wedge-shaped blocks are provided, and the two wedge-shaped blocks are respectively fixed to both sides of the water guide shell.

[0013] Furthermore, the secondary filtration mechanism includes: A movable frame is slidably connected to the water guide shell, and a filter plate 2 is inserted into the movable frame; There are two fixed plates, each fixed to the water guide shell. A connecting rod is slidably connected to the fixed plate, and the connecting rod is fixed to the movable frame. A spring is fixed between the fixed plate and the movable frame.

[0014] Furthermore, the movable frame is fixedly connected to two symmetrically distributed guide members, and the guide members are slidably connected to positioning blocks. The positioning blocks abut against the upper side of the filter plate two, and a spring five is fixedly connected between the positioning blocks and the guide members.

[0015] Furthermore, a sliding column is slidably connected through one side of the guide rail, a connecting rod is fixedly connected to the moving frame, a guide plate is fixedly connected to the connecting rod, and the guide plate is provided with an inclined through groove.

[0016] Furthermore, the outer end of the sliding column is provided with a cylindrical protrusion, which is slidably connected to the inclined through groove of the adjacent guide plate.

[0017] (III) Beneficial Effects Compared with the prior art, the present invention provides a sewage treatment tank with convenient filter plate replacement, which has the following beneficial effects: 1. When the pressure difference across the filter plate increases due to blockage, the limit mechanism is automatically triggered to release, and the filter plate flips upward under the action of the torsion spring, bringing the trapped impurities to the water surface. This design avoids the tedious work of manually probing into the sewage for disassembly and cleaning, which not only improves the working environment but also reduces the frequency of maintenance and labor intensity.

[0018] 2. Through the coordinated and alternating interception of filter plates one and two, the secondary filter plate can continue to filter wastewater while the primary filter plate is being cleaned or replaced, ensuring uninterrupted treatment. This design effectively prevents the risk of overflow or shutdown due to clogging of a single filter layer, improving the overall reliability and continuity of the system.

[0019] 3. Filter plate one is secured by a sliding frame, hinge rod, and limiting shell, and can be disassembled with a single press; filter plate two is limited by a spring positioning block and can be removed with a gentle pull. Both adopt a modular design, making cleaning or replacing filter plates simple and quick, shortening maintenance time and improving the maintainability of the equipment. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of a wastewater treatment tank with a convenient filter plate replacement according to the present invention; Figure 2 This is a schematic diagram of the structure of the water-guiding shell and wedge block in this invention; Figure 3 This is a rear view structural diagram of the connecting frame and filter plate and other parts in this invention; Figure 4 This is an exploded structural diagram of the connecting frame and filter plate, among other parts, in this invention. Figure 5 This is a structural schematic diagram of the limiting shell and hinge rod and other parts in this invention; Figure 6 This is a schematic diagram of the structure of the moving parts and rotating shafts in this invention; Figure 7 This is a schematic diagram of the structure of the support plate and limiting post, etc., in this invention; Figure 8 This is a side view of the two components, the movable frame and the filter plate, in this invention. Figure 9 This is a schematic diagram of the structure of the guide and positioning block in this invention; Figure 10 This is a schematic diagram of the sliding column and guide plate in this invention.

[0021] In the diagram: 1. Treatment tank; 2. Water guide shell; 3. Guide rail; 4. Moving part; 5. Rotating shaft; 6. Connecting frame; 7. Filter plate one; 8. Limiting part; 9. Limiting frame; 10. Limiting shell; 11. Fixing plate one; 12. Crossbeam; 13. Sliding frame; 14. Hinge rod; 15. Spring one; 16. Torsion spring; 17. Connecting plate; 18. Fixing rod; 19. Spring two; 20. Fixing block; 21. Limiting... 22. Positioning block; 23. Support plate; 24. Limiting post; 25. Rack 1; 26. Gear; 27. Rack 2; 28. Fixing plate 2; 29. ​​Spring 3; 30. Wedge block; 31. Moving frame; 32. Filter plate 2; 33. Fixing plate 3; 34. Connecting rod; 35. Spring 4; 36. Guide component; 37. Positioning block; 38. Spring 5; 39. Sliding post; 40. Connecting rod; 41. Guide plate. Detailed Implementation

[0022] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0023] It should be noted that, unless otherwise specified, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains.

[0024] In this invention, unless otherwise stated, the directional terms such as "up" and "down" generally refer to the directions shown in the accompanying drawings, or to the vertical, perpendicular, or gravitational direction; similarly, for ease of understanding and description, "left" and "right" generally refer to the left and right shown in the accompanying drawings; "inner" and "outer" refer to the inner and outer contours of each component itself, but the above directional terms are not intended to limit this invention.

[0025] This invention provides a wastewater treatment tank 1 with easily replaceable filter plates, such as... Figures 1-5 As shown, it includes: treatment tank 1, water guide shell 2, guide rail 3, moving part 4, rotating shaft 5, connecting frame 6, filter plate 1 7, limiting part 8, limiting frame 9, limiting shell 10, fixing plate 1 11, crossbeam 12, sliding frame 13, hinge rod 14, spring 1 15, torsion spring 16, connecting plate 17, fixing rod 18, spring 2 19, fixing block 20, limiting block 21, limiting mechanism and secondary filtration mechanism; Treatment tank 1, with a water guide shell 2 fixedly connected to the front side of treatment tank 1. Guide rails 3 are fixedly connected to both sides of water guide shell 2. Moving parts 4 are slidably connected to guide rails 3. Rotating shafts 5 are rotatably connected to moving parts 4. A connecting frame 6 is fixedly connected between the two rotating shafts 5. Filter plate 7 is detachably connected to the connecting frame 6. Filter plate 7 is equipped with limiting parts 8. A limiting frame 9 is slidably connected inside water guide shell 2. The limiting frame 9 is fixedly connected to moving parts 4. Two limiting shells 10 are slidably connected to the connecting frame 6, limiting the limiting parts 8. Fixed plate 11 is fixedly connected to rotating shaft 5. A crossbeam 12 is fixedly connected between the two fixed plates 11. Sliding frame 13 is slidably connected to crossbeam 12. A hinge rod 14 is hinged between sliding frame 13 and the two limiting shells 10. A spring is fixedly connected between sliding frame 13 and crossbeam 12. 15; A limiting mechanism is set on the moving part 4, which limits the rotation shaft 5, so that the filter plate 7 and the connecting frame 6 are in a vertical state; The secondary filtration mechanism is set inside the water guide shell 2, which intercepts impurities in the sewage for a second time; A long strip groove is set on the lower side of the connecting frame 6, and the lower side of the filter plate 7 is located in the long strip groove of the connecting frame 6; A torsion spring 16 is fixed between the fixed plate 11 and the moving part 4; Connecting plates 17 are fixed on both sides of the water guide shell 2; A fixed rod 18 is slidably connected to the connecting plate 17; The fixed rod 18 is fixed to the moving part 4 on the same side; A spring 19 is fixed between the fixed rod 18 and the connecting plate 17; A fixed block 20 is fixed to the moving part 4; A limiting block 21 is fixed to the fixed plate 11; The fixed block 20 limits the limiting block 21.

[0026] In use, press the sliding frame 13, and the sliding frame 13 moves downward along the crossbeam 12. The spring 15 is compressed, and the sliding frame 13 drives the two limiting shells 10 to slide away from each other along the connecting frame 6 through the hinge rod 14. Then, the filter plate 7 is snapped into the long groove of the connecting frame 6. Then, release the sliding frame 13, and the sliding frame 13 moves upward along the crossbeam 12. Under the elastic force of the spring 15, the sliding frame 13 moves upward and resets. The sliding frame 13 drives the limiting shell 10 to reset through the hinge rod 14. The limiting shell 10 limits the limiting member 8 and installs the filter plate 7 on the connecting frame 6.

[0027] Rotate the crossbeam 12, the connecting frame 6 rotates around the moving part 4 via the rotating shaft 5, the connecting frame 6 contacts the limiting frame 9, the filter plate 7 is in a vertical state, the rotating shaft 5 is limited by the limiting mechanism, sewage is injected into the front side of the guide water shell 2, the filter plate 7 filters the impurities in the sewage, and at the same time the secondary filtration mechanism assists the filter plate 7 in performing secondary filtration of the sewage.

[0028] like Figure 2 , Figure 6 and Figure 7 As shown, the limiting mechanism includes: a support plate 22, a limiting post 23, a rack 1 24, a gear 25, a rack 26, a fixing plate 27, a spring 3 28, and a wedge block 29; Two support plates 22 are provided, and the two support plates 22 are respectively fixed to two moving parts 4. The support plates 22 are splined connected to limit posts 23. The rotating shaft 5 is provided with blind holes, and the limit posts 23 are located in the blind holes of the rotating shaft 5. Rack 1 24 is fixed to the limit posts 23. The support plates 22 are rotatably connected to gears 25 through brackets. Rack 1 24 and gears 25 mesh. Rack 26 is slidably connected to the support plates 22. Rack 26 meshes with gears 25. The lower end of rack 26 is set as arc. Fixed plate 27 is fixed to rack 26. Spring 3 28 is fixed between fixed plate 27 and support plate 22. Two wedge blocks 29 are provided, and the two wedge blocks 29 are respectively fixed to both sides of the water guide shell 2.

[0029] After the connecting frame 6 is rotated to the vertical position, the limiting post 23 is inserted into the blind hole of the rotating shaft 5 to limit the rotation shaft 5. With prolonged use, the filter holes of the filter plate 7 are blocked by impurities in the sewage, resulting in a decrease in the filtration efficiency of the filter plate 7. After sewage is continuously injected into the water guide shell 2, the pressure on the front side of the filter plate 7 increases. The filter plate 7, the connecting frame 6 and the limiting frame 9 slide backward along the guide shell. The two moving parts 4 slide backward along the guide rail 3 respectively. The moving parts 4 drive the fixed rod 18 to slide backward along the connecting plate 17, and the spring 19 is compressed.

[0030] During the above process, the moving part 4 moves the support plate 22 together, and the support plate 22 moves the rack 26 backward until the lower end of the rack 26 abuts against the wedge block 29. As the moving part 4 moves backward, the wedge block 29 squeezes the lower end of the rack 26, causing the rack 26 to move upward along the support plate 22. The spring 3 28 is compressed, and the rack 26 drives the gear 25 to rotate. The gear 25 drives the rack 1 24 to rotate. The rack 1 24 pulls the limiting post 23 out of the blind hole of the rotating shaft 5. The limiting post 23 releases the limiting of the rotating shaft 5. Then, under the elastic force of the torsion spring 16, the rotating shaft 5 drives the connecting frame 6 to flip. After the fixing plate 1 11 drives the limiting block 21 to contact the fixing block 20, the rotating shaft 5 stops rotating. The connecting frame 6 drives the filter plate 1 7 to flip. During the flipping process of the connecting frame 6 and the filter plate 1 7, the garbage attached to the filter plate 1 7 is moved and flipped until it is away from the water surface.

[0031] During the flipping process of the connecting frame 6 and the filter plate 7, the pressure on the filter plate 7 will decrease. Then, under the elastic force of the spring 19, the moving part 4 and the parts on it will be reset. Then, the sliding frame 13 will be pressed to release the limiting shell 10 from limiting the limiting part 8. Then, the filter plate 7 will be cleaned and replaced.

[0032] like Figures 8-10 As shown, the secondary filtration mechanism includes: a movable frame 30, a second filter plate 31, a third fixed plate 32, a connecting rod 33, a fourth spring 34, a guide 35, a positioning block 36, a fifth spring 37, a sliding column 38, a connecting rod 39, and a guide plate 40. The movable frame 30 is slidably connected to the water guide shell 2, and the movable frame 30 is inserted with the filter plate 31. There are two fixed plates 32, which are fixedly connected to the water guide shell 2 respectively. The fixed plates 32 are slidably connected with the connecting rod 33, which is fixedly connected to the movable frame 30. A spring 4 34 is fixedly connected between the fixed plates 32 and the movable frame 30. The movable frame 30 is fixedly connected with two symmetrically distributed guide members 35. The guide members 35 are slidably connected with the positioning block 36, which abuts against the upper side of the filter plate 31. A spring 5 37 is fixedly connected between the positioning block 36 and the guide member 35. A sliding column 38 is slidably connected through one side of the guide rail 3. The movable frame 30 is fixedly connected with the connecting rod 33, and the connecting rod 33 is fixedly connected with the guide plate 40. The guide plate 40 is provided with an inclined through groove. The outer end of the sliding column 38 is provided with a columnar protrusion, which is slidably connected to the inclined through groove of the adjacent guide plate 40.

[0033] In use, the filter plate 2 31 presses against the two positioning blocks 36, causing the two positioning blocks 36 to move away from each other. At the same time, the spring 5 37 is compressed. Then, the filter plate 2 31 is inserted into the moving frame 30. Under the elastic force of the spring 5 37, the two positioning blocks 36 are reset and the upper side of the filter plate 2 31 is limited.

[0034] During use, filter plate 7 and filter plate 31 work together to perform multi-stage filtration of sewage. While filter plate 7 is being replaced and cleaned, filter plate 31 continues to filter sewage. When the filter holes of filter plate 31 are clogged with impurities, the filtration efficiency of filter plate 31 decreases, and the pressure on the front of filter plate 31 increases. Filter plate 31 and moving frame 30 move backward along the drain shell. Moving frame 30 drives connecting rod 33 to move backward along fixed plate 32, and spring 44 is compressed. Moving frame 30 drives guide plate 40 to move backward through connecting rod 39. Guide plate 40 drives sliding column 38 to move through inclined groove, so that sliding column 38 is inserted into guide rail 3. Limiting column 23 limits moving part 4. Thus, after the filtration efficiency of filter plate 31 decreases, filter plate 7 continues to work, causing a large amount of garbage to be intercepted on the front of filter plate 7.

[0035] Working principle: When in use, sewage is injected into the water guide shell 2. The sewage flows backward along the water guide shell 2 and flows into the treatment tank 1 through the filter plate 7 and the filter plate 31. The garbage in the sewage is intercepted in front of the filter plate 7.

[0036] When the filter holes of filter plate 7 become clogged after prolonged use, the pressure on the front side of filter plate 7 increases. Filter plate 7, connecting frame 6 and limiting frame 9 move backward along guide rail 3 via moving part 4, and the filter plate is compressed. When the lower end of rack 26 is pressed against wedge block 29, rack 26 moves upward along support plate 22 and drives gear 25 to rotate. Gear 25 drives rack 24 to move backward. Rack 24 pulls limiting post 23 out of blind hole of rotating post, releasing the limitation on rotating shaft 5. Then, under the elastic force of torsion spring 16, rotating shaft 5 drives filter plate to flip upward through connecting frame 6. Connecting frame 6 and filter plate 7 cooperate to carry some of the garbage on the front side of filter plate 7 out of the water.

[0037] During the above process, the limiting block 21 cooperates with the adjacent fixed block 20 to stop the movement of the connecting frame 6 and the filter plate 7 away from the water surface. During the flipping of the filter plate 7, the backward pressure on the filter plate 7 is reduced. At this time, under the elastic force of the spring 19, the limiting frame 9 and the moving part 4 are reset, the sewage flows backward and is filtered through the filter plate 31. The cooperation between the filter plate 7 and the filter plate 31 extends the inspection time of the staff and reduces the workload of the staff. Moreover, the double alternating filtration will not affect the normal discharge of sewage.

[0038] When the staff disassembles and cleans filter plate 7, the sliding frame 13 moves along the crossbeam 12. The sliding frame 13 releases the limiting shell 10 from limiting the limiting member 8 via the hinge rod 14. Then, filter plate 7 is removed from the elongated groove of the connecting frame 6, and the debris on the filter plate is cleaned. After cleaning, filter plate 7 is reinstalled on the connecting frame 6, and the crossbeam 12 is rotated, causing the connecting frame 6 to drive the rotating shaft 5 to rotate. After the connecting frame 6 contacts the limiting frame 9, filter plate 7 is in a vertical state, and the limiting post 23 is reinserted into the blind hole of the rotating shaft 5. The staff then cleans the debris on the front side of filter plate 31 together. Since the debris is intercepted on the front side of filter plate 7, the cleaning frequency of filter plate 31 is less than that of filter plate 7.

[0039] During use, after prolonged use, the filter holes of filter plate 2 31 will also be affected by the adhesion of organic matter and microorganisms in the sewage, causing the filter holes of filter plate 2 31 to shrink and the pressure on the front side of filter plate 2 31 to increase. Filter plate 2 31 moves backward along the water inlet shell through the moving frame 30, and spring 4 34 is compressed. The moving frame 30 drives the guide plate 40 to move backward through the connecting rod 39. The guide plate 40 uses the cylindrical protrusion on the sliding column 38 to insert the sliding column 38 into the guide rail 3, thereby limiting the moving part 4. After the filtration efficiency of filter plate 2 31 decreases, the moving part 4 cannot move backward, and the limiting column 23 is always inserted into the blind hole of the rotating shaft 5. Thus, filter plate 1 7 and filter plate 2 31 work simultaneously to filter impurities in sewage and intercept garbage on the front side of filter plate 1 7. When cleaning filter plate 7 and filter plate 31 is required, filter plate 7 should be cleaned first, and then filter plate 31 should be cleaned. When cleaning filter plate 31, pull the positioning block 36 to both sides so that the positioning block 36 no longer squeezes filter plate 31. Then remove filter plate 31 from the moving frame 30. Under the elastic force of spring 4 34, the moving frame 30 and connecting rod 39 are reset, and the sliding column 38 no longer limits the moving part 4. After cleaning filter plate 31, reinstall it into the moving frame 30 so that filter plate 7 and filter plate 31 can work again.

[0040] In all the solutions mentioned above, for connections between two components, welding, bolt and nut connection, bolt or screw connection, or other known connection methods can be selected according to the actual situation. These will not be elaborated here. For all fixed connections mentioned above, welding is preferred. Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present invention.

Claims

1. A wastewater treatment tank with easily replaceable filter plates, comprising: Treatment tank (1), a water guide shell (2) is fixedly connected to one side of the treatment tank (1), and guide rails (3) are fixedly connected to both sides of the water guide shell (2). A moving part (4) is slidably connected to the guide rail (3), and a rotating shaft (5) is rotatably connected to the moving part (4). A connecting frame (6) is fixedly connected between the two rotating shafts (5). The filter plate (7) is detachably connected to the connecting frame (6). The filter plate (7) is provided with a limiting component (8). The water guide shell (2) is slidably connected to a limiting frame (9). The limiting frame (9) is fixedly connected to the moving component (4). The connecting frame (6) is slidably connected to two limiting shells (10). The limiting shells (10) limit the limiting component (8). A limiting mechanism is provided on the moving part (4). The limiting mechanism limits the rotating shaft (5) so that the filter plate (7) and the connecting frame (6) are in a vertical state. A secondary filtration mechanism is installed inside the water guide shell (2), which performs secondary interception of impurities in the sewage.

2. A sewage treatment tank with filter panels that are easily replaced according to claim 1, characterized in that The rotating shaft (5) is fixedly connected to a fixing plate (11), and a crossbeam (12) is fixedly connected between the two fixing plates (11). The crossbeam (12) is slidably connected to a sliding frame (13). The sliding frame (13) is hinged to the two limiting shells (10) with a hinge rod (14). A spring (15) is fixedly connected between the sliding frame (13) and the crossbeam (12). A long strip groove is provided on the lower side of the connecting frame (6), and the lower side of the filter plate (7) is located in the long strip groove of the connecting frame (6).

3. A filter system according to claim 2, wherein the filter system is a sewage treatment plant. A torsion spring (16) is fixed between the fixed plate (11) and the moving part (4). A connecting plate (17) is fixed on both sides of the water guide shell (2). A fixed rod (18) is slidably connected to the connecting plate (17). The fixed rod (18) is fixed to the moving part (4) on the same side. A spring (19) is fixed between the fixed rod (18) and the connecting plate (17).

4. A filter system according to claim 2, wherein, The movable part (4) is fixedly connected to a fixing block (20), and the fixing plate (11) is fixedly connected to a limiting block (21). The fixing block (20) limits the limiting block (21).

5. A filter system according to claim 2, wherein, The limiting mechanism includes: There are two support plates (22), which are respectively fixed to the two moving parts (4). The support plates (22) are splined to limit posts (23). The rotating shaft (5) is provided with blind holes, and the limit posts (23) are located in the blind holes of the rotating shaft (5). Rack 1 (24) is fixed to the limiting post (23), and the support plate (22) is rotatably connected to the gear (25) through the bracket. Rack 1 (24) and the gear (25) mesh. An unlocking component is provided on the support plate (22), which removes the limiting post (23) from the blind hole of the rotating shaft (5).

6. A filter system according to claim 5, wherein the filter system is a sewage treatment plant. The unlocking component includes: Rack 2 (26) is slidably connected to the support plate (22), and the rack 2 (26) meshes with the gear (25). The lower end of the rack 2 (26) is set to be arc-shaped. Fixed plate two (27) is fixedly connected to the rack two (26), and spring three (28) is fixedly connected between the fixed plate two (27) and the support plate (22). Two wedge blocks (29) are provided, and the two wedge blocks (29) are respectively fixed to both sides of the water guide shell (2).

7. A filter system according to claim 2, wherein, The secondary filtration mechanism includes: The movable frame (30) is slidably connected to the water guide shell (2), and the movable frame (30) is plugged with the filter plate two (31). There are two fixed plates (32), which are respectively fixed to the water guide shell (2). The fixed plates (32) are slidably connected to the connecting rod (33), and the connecting rod (33) is fixed to the moving frame (30). A spring (34) is fixed between the fixed plates (32) and the moving frame (30).

8. A filter system according to claim 7, wherein the filter system is a sewage treatment plant. The movable frame (30) is fixedly connected to two symmetrically distributed guide members (35). The guide members (35) are slidably connected to a positioning block (36). The positioning block (36) abuts against the upper side of the filter plate (31). A spring (37) is fixedly connected between the positioning block (36) and the guide members (35).

9. A wastewater treatment tank with easily replaceable filter plates according to claim 7, characterized in that, A sliding column (38) is slidably connected through one side of the guide rail (3), a connecting rod (33) is fixedly connected to the moving frame (30), a guide plate (40) is fixedly connected to the connecting rod (33), and the guide plate (40) is provided with an inclined through groove.

10. A wastewater treatment tank with easily replaceable filter plates according to claim 9, characterized in that, The outer end of the sliding column (38) is provided with a columnar protrusion, and the columnar protrusion of the sliding column (38) is slidably connected to the inclined through groove of the adjacent guide plate (40).

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