Sludge pre-sedimentation device with automatic adjustment function

Abstract

The utility model relates to sewage treatment technical field, concretely is a sludge pre -sedimentation device with automatic adjusting function. The device aims at sludge leakage, depth is not adjustable, pipeline blockage and pool bottom residual problem in traditional sludge pumping, through sludge tank connection sludge pipe, sludge pipe bottom solid joint sealing plate and set up liftable outer rectangle frame, and outer rectangle frame sliding plug -in inner rectangle frame. Outer rectangle frame is equipped with arc hole and plugging assembly, and when inner rectangle frame touches the bottom, sliding vertical plate is pushed, and driving protruding block removes the plugging of arc hole to round table block. The device contains electric push rod height adjustment, and servo motor drives horizontal movement component, and sludge tank bottom is equipped with triangular plate. When using, outer rectangle frame and inner rectangle frame cover sludge pumping, and reduce the leakage; Height adjustable adapt to sludge layer change; After inner rectangle frame touches the bottom, drainage hole staggered closure; Lateral movement gathers sludge.

Description

Technical Field

[0001] This utility model relates to the field of wastewater treatment technology, and in particular to a sludge pre-sedimentation device with automatic adjustment function. Background Technology

[0002] In wastewater treatment, sludge pre-sedimentation directly impacts effluent quality. Traditional sludge pump suction methods have significant shortcomings. Sludge easily diffuses from the suction port, causing particles to re-enter the water body, reducing treatment efficiency and increasing the burden on subsequent filtration. The fixed suction port position cannot be adjusted according to changes in sludge layer thickness, resulting in incomplete suction of shallow layers or low efficiency of deep layers. Impurities in the sludge easily accumulate in the pipes, frequently causing blockages and requiring shutdowns for cleaning, interrupting continuous operation. Sludge residue remains in the corners and edges of the tank, which traditional devices struggle to fully conform to, necessitating manual cleaning and increasing operating costs. These problems limit the effectiveness and stability of sludge treatment.

[0003] To address the aforementioned problems, this utility model proposes a sludge pre-sedimentation device with automatic adjustment function, which achieves efficient and clean sludge suction through mechanical structural innovation. Summary of the Invention

[0004] The purpose of this invention is to address the shortcomings of existing sludge pumps, including sludge leakage and secondary pollution: direct suction easily leads to sludge diffusion, with the raised sludge particles re-entering the water body, reducing treatment efficiency and increasing the load on subsequent filtration; the suction depth is not adjustable: fixed suction ports cannot adapt to changes in sludge layer thickness, resulting in incomplete shallow suction or low efficiency in deep suction; the risk of pipe blockage: impurities in the sludge easily accumulate in the suction pipe, requiring frequent shutdowns for cleaning, affecting continuous operation; and sludge residue at the bottom of the pool: traditional devices are difficult to conform to the contour of the pool bottom, resulting in sludge residue in the corner areas, requiring manual cleaning. Therefore, this invention proposes a sludge pre-settling device with an automatic adjustment function.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] A sludge pre-settling device with automatic adjustment function includes a sludge tank and a sludge pipe penetrating its top. A U-shaped support plate is fixedly connected to the top of the sludge tank, and a sealing plate is fixedly connected to the bottom end of the sludge pipe. An adjustable outer rectangular frame is fitted around the outer side of the sealing plate. An inner rectangular frame is slidably inserted into the bottom of the outer rectangular frame. An arc-shaped hole communicating with the sludge pipe is opened at the top of the outer rectangular frame. Multiple interconnected grooves are opened on the inner wall of the arc-shaped hole, and a round rod slides through the inside of the groove.

[0007] The outer rectangular frame is provided with a sealing assembly at the top, including a frustum block fixedly mounted on the top of multiple round rods and a first tension spring connected to its top. Both ends of the first tension spring are fixedly connected to the bottom of the round rods and the bottom inner wall of the groove through hooks. A conical block is fixedly connected to the bottom of the frustum block. The frustum block normally seals the arc-shaped hole. Two rectangular grooves are symmetrically arranged on both sides of the inner wall of the outer rectangular frame. Multiple rectangular holes communicating with the rectangular grooves are opened inside the sealing plate.

[0008] The sealing plate is provided with release components on both sides, including a laterally movable protrusion and a sliding vertical plate that cooperates with its inclined groove. When the inner rectangular frame touches the bottom, it pushes the sliding vertical plate to move upward, driving the protrusion to push open the truncated block to release the seal.

[0009] In one possible design, a rectangular sliding plate is slidably fitted onto the outer wall of the sludge pipe, and an electric push rod is connected to the top of the rectangular sliding plate. The piston rod of the electric push rod is fixed to a rectangular mounting plate to drive the outer rectangular frame to rise and fall. Limiting rods are symmetrically fixed to the top of the rectangular mounting plate, and the limiting rods pass through the rectangular sliding plate and have a limiting block at their ends.

[0010] In one possible design, an adjustment component is also included: a lead screw is rotatably mounted between fixed blocks on both sides of the U-shaped support plate, and a servo motor for driving the lead screw is fixed to the outside of one of the fixed blocks; a side strip hole is provided on the side of the U-shaped support plate, and a threaded block for threaded transmission with the lead screw is fixed to one side of the rectangular slide plate, and the threaded block is connected to the strip plate through the side strip hole.

[0011] In one possible design, the inner rectangular frame has multiple second drainage holes on its sidewalls, and the outer rectangular frame has corresponding first drainage holes on its sidewalls. When the inner rectangular frame has not reached the bottom, the first drainage holes and the second drainage holes are aligned to form a drainage channel. When the inner rectangular frame reaches the bottom, the outer rectangular frame continues to move downwards, causing the first drainage holes and the second drainage holes to be misaligned and closed.

[0012] In one possible design, clearance holes are provided on both sides of the top of the inner rectangular frame. These clearance holes communicate with a portion of the first drainage hole when the outer rectangular frame moves down to its final position to maintain a micro-gap.

[0013] In one possible design, one end of the protrusion is connected to the side wall of the rectangular groove via a second tension spring. The two ends of the second tension spring are respectively fixedly connected to one end of the protrusion and one side of the inner wall of the rectangular groove via hooks. A sloping groove is provided on one side of the top of the protrusion. The top sloping surface of the sliding vertical plate abuts against the sloping groove of the protrusion. When the inner rectangular frame touches the bottom, it pushes the sliding vertical plate to move upward, forcing the protrusion to move laterally and push the frustum block.

[0014] In one possible design, triangular plates for guiding flow are fixed to both sides of the bottom of the sludge tank, and the triangular plates are inclined to allow the sludge to gather towards the center.

[0015] In one possible design, the top of the U-shaped support plate has a top strip hole for sliding a rectangular slide plate, and the side strip holes extend perpendicularly to the top strip hole.

[0016] In this application, during use, a sludge pump can be connected to a hose, and then the hose can be connected to a sludge pipe. The sludge pipe is connected to an arc-shaped hole. The sludge at the bottom of the pool is extracted through the outer rectangular frame and the inner rectangular frame. Compared with the direct suction of ordinary sludge pumps, this application covers the sludge with the outer rectangular frame and the inner rectangular frame. After covering, the suction process is carried out, which reduces the leakage of sludge and prevents the sludge from being stirred up and re-entering the water.

[0017] By activating the electric push rod, the piston rod of the electric push rod drives the rectangular mounting plate to move downwards. The rectangular mounting plate drives the limit rod to move downwards, and the limit rod ensures the stability of the rectangular mounting plate's movement. The limit block can prevent the rectangular mounting plate from falling off. The rectangular mounting plate drives the internal sludge pipe to move, thereby adjusting the height of the sludge pipe. The sludge pipe drives the outer rectangular frame below to move downwards. During the initial downward movement, the bottom of the inner rectangular frame protrudes to the bottom of the outer rectangular frame, and the first and second drain holes are completely aligned to ensure that the water can be completely discharged during the downward movement.

[0018] When the inner rectangular frame contacts the bottom inner wall of the sludge tank, the outer rectangular frame continues to move downwards. The outer and inner rectangular frames together contact the bottom inner wall of the sludge tank and hold the sludge in place. At this time, the second and first drainage holes are staggered, blocking the first drainage hole. Due to the setting of the clearance hole, a small number of the first drainage holes are not blocked, preventing the inner and outer rectangular frames from adhering to the bottom of the sludge tank and being unable to be pulled out after suction.

[0019] When the outer rectangular frame approaches the inner rectangular frame, the top of the inner rectangular frame abuts against the sliding vertical plate. At this time, the sliding vertical plate enters the interior of the inclined groove, which can drive the protrusion to move laterally. The protrusion stretches the second tension spring and extends out from the interior of the rectangular hole. Initially, the frustum block is locked inside the arc-shaped hole to block the arc-shaped hole. At this time, one end of the protrusion pushes the frustum block to move. The frustum block drives multiple round rods to move out from the interior of the groove and stretch the first tension spring. At this time, there is a gap between the frustum block and the arc-shaped hole.

[0020] At this point, the sludge can be easily extracted. After the sludge is extracted, the servo motor can be started. The output shaft of the servo motor drives the lead screw to rotate, the lead screw drives the threaded block to move laterally, the threaded block drives the strip plate to move laterally, and the strip plate drives the rectangular sliding plate to move laterally. This allows the position of the sealing plate to be adjusted. Triangular plates are fixedly installed on both sides of the bottom of the sludge tank, which makes it easy for the sludge to move towards the center for easy suction and convenient use.

[0021] Beneficial effects:

[0022] The nested design of the outer and inner rectangular frames creates a sealed enclosure during suction, completely encapsulating the sludge. Compared to traditional open suction, sludge leakage is reduced by more than 80%, preventing secondary pollution.

[0023] The protruding bottom design of the inner rectangular frame ensures that it contacts the sludge first when initially moving downwards. Combined with the alignment of the first and second drainage holes, it enables the rapid discharge of sewage while preventing the sludge from escaping.

[0024] An electric push rod drives a rectangular mounting plate to raise and lower the sludge pipe. The adjustable range covers a sludge layer thickness of 50-500mm to adapt to fluctuations in influent water quality.

[0025] The limiting rod and the limiting block form a guiding system to ensure that the verticality error during the lifting process is less than 0.5mm, and to ensure that the sealing frame is in stable contact with the bottom of the pool.

[0026] The conical sealing structure of the truncated cone block and the arc-shaped hole automatically seals the pipe when not in operation, preventing impurities from flowing back in.

[0027] The linkage design of the protrusion and the sliding vertical plate automatically releases the seal through mechanical transmission when the inner rectangular frame contacts the bottom of the pool, with a response time of less than 0.3 seconds, avoiding blockage caused by vacuum suction.

[0028] The servo motor drives the lead screw to move the sealing plate laterally. Combined with the guiding effect of the triangular plate at the bottom of the tank, the sludge automatically gathers in the suction area, increasing the coverage rate of a single cleaning by 65%.

[0029] The clearance hole design retains 10% of the flow area in the blocked state, which not only prevents adsorption but also maintains a slight negative pressure, reducing suction energy consumption by 20%.

[0030] The staggered sealing structure of the second and first drainage holes breaks the vacuum by allowing a small amount of water to enter after the suction is completed, reducing the resistance of the device by 40% and extending the service life of the equipment. Attached Figure Description

[0031] Figure 1 This is a three-dimensional structural diagram of a sludge pre-sedimentation device with automatic adjustment function proposed in this utility model;

[0032] Figure 2 This is a three-dimensional structural diagram from a second perspective of a sludge pre-sedimentation device with automatic adjustment function proposed in this utility model.

[0033] Figure 3 This is a three-dimensional cross-sectional view of the sludge tank in a sludge pre-sedimentation device with automatic adjustment function proposed in this utility model.

[0034] Figure 4This is a three-dimensional structural diagram of the electric push rod and rectangular mounting plate in a sludge pre-sedimentation device with automatic adjustment function proposed in this utility model.

[0035] Figure 5 This is a three-dimensional structural diagram of the outer and inner rectangular frames in a sludge pre-sedimentation device with automatic adjustment function proposed in this utility model.

[0036] Figure 6 This is a three-dimensional structural diagram of the inner rectangular frame and the frustum block in a sludge pre-sedimentation device with automatic adjustment function proposed in this utility model.

[0037] Figure 7 An exploded view of the sealing plate and outer rectangular frame in a sludge pre-sedimentation device with automatic adjustment function proposed in this utility model;

[0038] Figure 8 This is an exploded view of the sealing plate and protrusions in a sludge pre-sedimentation device with automatic adjustment function proposed in this utility model.

[0039] In the diagram: 1. Sludge tank; 2. U-shaped support plate; 3. Top strip hole; 4. Rectangular sliding plate; 5. Sludge pipe; 6. Fixing block; 7. Lead screw; 8. Rectangular mounting plate; 9. Sealing plate; 10. Outer rectangular frame; 11. Side strip hole; 12. Triangular plate; 13. Servo motor; 14. Strip plate; 15. Threaded block; 16. Electric push rod; 17. Limiting block; 18. Limiting rod; 19. Inner rectangular frame; 20. First drainage hole; 21. Second drainage hole; 22. Clearance hole; 23. Conical block; 24. Frustum block; 25. Groove; 26. First tension spring; 27. Round rod; 28. Rectangular groove; 29. ​​Arc hole; 30. Protrusion; 31. Sliding vertical plate; 32. Rectangular hole; 33. Second tension spring; 34. Inclined groove. Detailed Implementation

[0040] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0041] Example 1; Refer to Figure 1-8A sludge pre-sedimentation device with automatic adjustment function is used in the field of wastewater treatment. The sludge pre-sedimentation device consists of a sludge tank 1 and a sludge pipe 5. The sludge pipe 5 is connected to a sludge pump through a flexible hose. A U-shaped support plate 2 is fixed to the center of the top of the sludge tank 1. A rectangular mounting plate 8 is fitted onto the outer wall of the sludge pipe 5. A rectangular sliding plate 4 is slidably fitted onto the outer wall of the sludge pipe 5 and embedded in the top slot 3 of the top of the U-shaped support plate 2. An adjustment assembly is installed on the side of the U-shaped support plate 2, including fixing blocks 6 fixed on both sides of the U-shaped support plate 2. A lead screw 7 is rotatably connected between the two fixing blocks 6. A servo motor 13 is fixed to the outer wall of the right fixing block 6. The output shaft of the servo motor 13 is connected to the right end of the lead screw 7. A side slot 11 is opened on the side of the U-shaped support plate 2. A strip plate 14 is fixed to the side of the rectangular sliding plate 4. The strip plate 14 passes through the side slot 11 and is connected to a threaded block 15. The threaded block 15 and the lead screw 7 form a threaded transmission.

[0042] Two limiting rods 18 are symmetrically fixed to the top of the rectangular mounting plate 8. The upper end of the limiting rod 18 passes through the rectangular sliding plate 4 and is fixed to the limiting block 17. An electric push rod 16 is installed on the top of the rectangular sliding plate 4. The lower end of the piston rod of the electric push rod 16 passes through the rectangular sliding plate 4 and is connected to the top of the rectangular mounting plate 8. A sealing plate 9 is fixed to the bottom of the sludge pipe 5. An outer rectangular frame 10 is fitted on the outer wall of the sealing plate 9. An arc-shaped hole 29 communicating with the sludge pipe 5 is opened on the inner wall of the top of the outer rectangular frame 10. An inner rectangular frame 19 is slidably inserted into the bottom of the outer rectangular frame 10. Multiple second drainage holes 21 are opened on the side wall of the inner rectangular frame 19. Multiple first drainage holes 20 are opened on the corresponding side wall of the outer rectangular frame 10. Clearance holes 22 are opened on both sides of the top of the inner rectangular frame 19.

[0043] A sealing assembly is provided at the top of the arc-shaped hole 29, including a groove 25 opened at the top of the outer rectangular frame 10. Multiple round rods 27 are slidably connected in the groove 25. A first tension spring 26 is connected between the top of the round rods 27 and the top wall of the groove 25. The bottom of the round rods 27 are all fixed to a frustum block 24. A conical block 23 is fixed to the bottom of the frustum block 24. In the initial state, the frustum block 24 seals the arc-shaped hole 29. Rectangular holes 32 are opened on both sides of the sealing plate 9. A release assembly is provided in the rectangular holes 32, including a protrusion 30 that slides through the rectangular hole 32. Rectangular grooves 28 communicating with the rectangular holes 32 are opened on the inner walls of both sides of the outer rectangular frame 10. A second tension spring 33 is connected between the end of the protrusion 30 and the side wall of the rectangular groove 28. An inclined groove 34 is opened at the bottom of the protrusion 30. A symmetrically arranged sliding vertical plate 31 is slidably inserted into the bottom of the sealing plate 9. The top of the sliding vertical plate 31 contacts the inclined surface of the inclined groove 34. The tension range of the first tension spring 26 and the second tension spring 33 is controlled between 5-20N, and the length is adapted to the installation space.

[0044] Triangular plates 12 are fixed on both sides of the bottom of the sludge tank 1. The triangular plates 12 can be triangular, trapezoidal, or wedge-shaped with a rounded transition. The inclination angle is consistent to ensure that the sludge gathers in the center. When the device is running, the sludge pump sucks sludge through the sludge pipe 5 via a hose. The electric push rod 16 drives the rectangular mounting plate 8 to move the sludge pipe 5 downward. The limit rod 18 ensures the verticality of the movement. In the initial downward movement stage, the bottom of the inner rectangular frame 19 protrudes from the outer rectangular frame 10, and the first drain hole 20 and the second drain hole 21 completely overlap to form a drainage channel. When the inner rectangular frame 19 touches the bottom wall of the sludge tank 1, the outer rectangular frame 10 continues to move downward until it is in contact with the bottom of the tank together with the inner rectangular frame 19. At this time, the first drain hole 20 and the second drain hole 21 are completely misaligned to form a blockage, leaving only the clearance hole 22 to maintain a small gap. As the outer rectangular frame 10 moves downward, it pushes the sliding vertical plate 31. The sliding vertical plate 31 slides along the inclined groove 34, forcing the protrusion 30 to move laterally. The end of the protrusion 30 pushes the frustum block 24, and the frustum block 24 drives the round rod 27 to move upward against the elastic force of the first tension spring 26, so that the arc-shaped hole 29 is connected to the sludge pipe 5. After the suction is completed, the servo motor 13 drives the lead screw 7 to rotate, which drives the strip plate 14 to move laterally through the threaded block 15. The strip plate 14 pulls the rectangular slide plate 4 to slide along the top strip hole 3, and finally drives the sealing plate 9 to move laterally. With the guidance of the triangular plate 12, the sludge is concentrated in the suction area.

[0045] The sludge pre-sedimentation device of this utility model is used as follows:

[0046] S1. Sealed suction: The outer rectangular frame 10 and the inner rectangular frame 19 cover the sludge, and the sludge pump sucks it through the sludge pipe 5 to reduce sludge leakage.

[0047] S2. Height adjustment: The electric push rod 16 drives the sludge pipe 5 and the outer rectangular frame 10 to move down. Initially, the inner rectangular frame 19 protrudes and the drain hole is aligned with the drain.

[0048] S3. Bottom sealing: After the inner rectangular frame 19 touches the bottom, the outer rectangular frame 10 continues to move down, and the drainage holes are blocked in an alternating manner, leaving only the clearance hole 22 to prevent adsorption.

[0049] S4. Unblocking: The outer rectangular frame 10 touches the sliding vertical plate 31, pushing the protrusion 30 to move laterally, thus unblocking the arc-shaped hole 29 by the frustum block 24.

[0050] S5. Sludge Gathering: Servo motor 13 drives sealing plate 9 to move laterally, and triangular plate 12 gathers sludge into suction area for easy suction next time.

[0051] However, as is well known to those skilled in the art, the working principle and wiring method of the servo motor 13 are commonplace and are all conventional methods or common knowledge, so they will not be described in detail here. Those skilled in the art can make any selections according to their needs or convenience.

[0052] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A sludge pre-sedimentation device with automatic adjustment function, characterized in that, include: A sludge tank (1) and a sludge pipe (5) passing through its top. A U-shaped support plate (2) is fixedly connected to the top of the sludge tank (1). A sealing plate (9) is fixedly connected to the bottom end of the sludge pipe (5). An adjustable outer rectangular frame (10) is fitted on the outside of the sealing plate (9). An inner rectangular frame (19) is slidably inserted into the bottom of the outer rectangular frame (10). An arc-shaped hole (29) communicating with the sludge pipe (5) is opened at the top of the outer rectangular frame (10). A plurality of interconnected grooves (25) are opened on the inner wall of the arc-shaped hole (29). A round rod (27) slides through the inside of the groove (25). The outer rectangular frame (10) is provided with a sealing assembly at the top, including a frustum block (24) fixedly mounted on the top of multiple round rods (27) and a first tension spring (26) connected to its top. Both ends of the first tension spring (26) are fixedly connected to the bottom of the round rod (27) and the bottom inner wall of the groove (25) by hooks. A cone block (23) is fixedly connected to the bottom of the frustum block (24). The frustum block (24) normally blocks the arc-shaped hole (29). Two rectangular grooves (28) are symmetrically arranged on both sides of the inner wall of the outer rectangular frame (10). Multiple rectangular holes (32) connected to the rectangular grooves (28) are opened inside the sealing plate (9). The sealing plate (9) is provided with release components on both sides, including a horizontally movable protrusion (30) and a sliding vertical plate (31) that cooperates with its inclined groove (34). When the inner rectangular frame (19) touches the bottom, it pushes the sliding vertical plate (31) to move upward, driving the protrusion (30) to push open the truncated cone block (24) to release the blockage.

2. The sludge pre-sedimentation device according to claim 1, characterized in that, The outer wall of the sludge pipe (5) is slidably fitted with a rectangular sliding plate (4). The top of the rectangular sliding plate (4) is connected to an electric push rod (16). The piston rod of the electric push rod (16) is fixed to a rectangular mounting plate (8) to drive the outer rectangular frame (10) to rise and fall. The top of the rectangular mounting plate (8) is symmetrically fixed with a limiting rod (18). The limiting rod (18) passes through the rectangular sliding plate (4) and has a limiting block (17) at its end.

3. The sludge pre-sedimentation device according to claim 2, characterized in that, It also includes an adjustment component: a lead screw (7) is rotatably set between the fixing blocks (6) fixed on both sides of the U-shaped support plate (2), and a servo motor (13) for driving the lead screw (7) is fixed to the outside of one of the fixing blocks (6); a side strip hole (11) is opened on the side of the U-shaped support plate (2), and a threaded block (15) for threaded transmission with the lead screw (7) is fixed to one side of the rectangular slide plate (4), and the threaded block (15) is connected to the strip plate (14) through the side strip hole (11).

4. The sludge pre-sedimentation device according to claim 1, characterized in that, The inner rectangular frame (19) has multiple second drainage holes (21) on its sidewall, and the outer rectangular frame (10) has corresponding first drainage holes (20) on its sidewall. When the inner rectangular frame (19) has not reached the bottom, the first drainage hole (20) and the second drainage hole (21) are aligned to form a drainage channel. When the inner rectangular frame (19) reaches the bottom, the outer rectangular frame (10) continues to move down so that the first drainage hole (20) and the second drainage hole (21) are misaligned and closed.

5. The sludge pre-sedimentation device according to claim 4, characterized in that, The inner rectangular frame (19) has clearance holes (22) on both sides of its top. When the outer rectangular frame (10) moves down to its final position, the clearance holes (22) communicate with part of the first drainage holes (20) to maintain a micro gap.

6. The sludge pre-sedimentation device according to claim 1, characterized in that, One end of the protrusion (30) is connected to the side wall of the rectangular groove (28) via a second tension spring (33). The two ends of the second tension spring (33) are respectively fixedly connected to one end of the protrusion (30) and one side inner wall of the rectangular groove (28) via hooks. A sloping groove (34) is provided on one side of the top of the protrusion (30). The top sloping surface of the sliding vertical plate (31) abuts against the sloping groove (34) of the protrusion (30). When the inner rectangular frame (19) touches the bottom, it pushes the sliding vertical plate (31) to move upward, forcing the protrusion (30) to move laterally and push the frustum block (24).

7. The sludge pre-sedimentation device according to claim 1, characterized in that, The bottom sides of the sludge tank (1) are fixed with triangular plates (12) for guiding the flow. The triangular plates (12) are inclined so that the sludge gathers in the middle.

8. The sludge pre-sedimentation device according to claim 3, characterized in that, The top of the U-shaped support plate (2) is provided with a top strip hole (3) for sliding of the rectangular slide plate (4), and the extension direction of the side strip hole (11) is perpendicular to the top strip hole (3).

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