Sludge discharging and gas stripping device of sedimentation tank

Abstract

The utility model discloses a sedimentation tank sludge discharging and gas stripping device which comprises a connecting base, a sedimentation tank is arranged on the end face of the connecting base, a movable sludge discharging structure is arranged at the bottom of an inner cavity of the sedimentation tank, a plurality of sets of scraper fixing structures are connected to the movable sludge discharging structure, and a sludge collecting box is connected to the side wall of the sedimentation tank. A sludge collecting box is arranged in the settling pond, a sewage disposal pump is connected to the side wall of the sludge collecting box, and a controller is connected to the side wall of the settling pond. A driving motor in the movable sludge discharging structure is used for driving a conveying auger to rotate through a transmission structure, and meanwhile, a sludge scraper on a scraper fixing structure can be driven to reciprocate, so that sludge at the bottom of the sedimentation tank can be collected into a sludge collecting box, and the sludge can be cleaned more thoroughly.

Description

Technical Field

[0001] This utility model relates to the field of wastewater treatment technology, specifically to a sludge removal and air-lift device for sedimentation tanks. Background Technology

[0002] The existing sedimentation tank sludge removal air lifting device consists of an air source, pipelines, sludge hopper, electric valves, etc. It is mainly used for sludge removal from sedimentation tanks. The air source is an air compressor or blower that provides compressed air, thereby discharging the sludge through the sludge removal pipe.

[0003] When the air source is started to discharge sludge, a large amount of sludge will accumulate at the bottom of the sedimentation tank. The sludge is not cleaned properly, and manual labor is required to gather the sludge at the bottom of the sedimentation tank, which consumes a lot of labor. At the same time, most of the scrapers in the existing equipment are fixed, which is inconvenient to replace when damaged, thus affecting the use of the equipment. Utility Model Content

[0004] This invention provides a sludge removal and air-lift device for sedimentation tanks to solve the above-mentioned problems.

[0005] To achieve the above objectives, this utility model provides the following technical solution:

[0006] A sludge removal and air-lift device for a sedimentation tank includes a connecting base, a sedimentation tank on the end face of the connecting base, a movable sludge removal structure at the bottom of the inner cavity of the sedimentation tank, multiple sets of scraper fixing structures connected to the movable sludge removal structure, a sludge collection box connected to the side wall of the sedimentation tank, a blower connected to the side wall of the sludge collection box, a sludge discharge pipe connected to the end face of the sludge collection box, a control valve connected to the air inlet pipe of the blower, a controller connected to the side wall of the sedimentation tank, and the air outlet of the blower communicating with the inner cavity of the sludge collection box via an air injection pipe, wherein a one-way valve is installed on the air injection pipe, the flow direction of the one-way valve is towards the inner cavity of the sludge collection box, and the sludge discharge pipe communicating with the inner cavity of the sludge collection box.

[0007] The mobile sludge discharge structure includes a connecting bracket and a drive motor. The connecting bracket is connected to the side wall of the sedimentation tank. The drive motor is connected to the end face of the connecting base via a connecting seat. The drive end of the drive motor is connected to a drive rod via a coupling. One end of the drive rod, located inside the sedimentation tank, is connected to a conveying auger. A drive bevel gear is connected to the side wall of the drive rod. A driven bevel gear is symmetrically meshed with the side wall of the drive bevel gear. A rotating rod is connected to the center of the driven bevel gear. The other end of the rotating rod... A rotating turntable is connected to the settling tank. A connecting lever is connected to the side wall of the rotating turntable. A swing plate is provided on one side of the rotating turntable. A connecting groove is opened on the side wall of the swing plate, corresponding to the connecting lever. A connecting rod is connected to the side wall of the connecting lever, below the connecting groove. A toggle lever is connected in the connecting groove, above the connecting lever. A connecting slide rod is connected to the side wall of the toggle lever. A limiting sleeve is connected to the side wall of the connecting slide rod. The limiting sleeve is connected to the side wall of the settling tank.

[0008] As a preferred embodiment of this utility model, the scraper fixing structure includes a connecting frustum, which is connected to the end face of the connecting slide rod. A fixing bolt is connected to the center of the connecting frustum, a connecting plate is connected to the side wall of the fixing bolt, a rotating support plate is connected to the side wall of the connecting plate, a fixed plate is connected to one end of the rotating support plate, a connecting rod is connected to the side wall of the fixed plate, a connecting clamp is connected to the other end of the fixed plate, and a sludge scraper is connected to the connecting clamp.

[0009] As a preferred embodiment of this utility model, the blower is connected to the controller via a wire in an electrical connection manner, the control valve is connected to the controller via a wire in an electrical connection manner, the drive motor is connected to the controller via a wire in an electrical connection manner, and the drive rod is connected to the side wall of the connecting bracket via a bearing seat, wherein the drive rod and the bearing seat are connected in a rotatable connection manner.

[0010] As a preferred embodiment of this utility model, a sludge-gathering trough is provided in the inner cavity of the sedimentation tank and corresponding to the conveying auger, wherein the conveying auger and the sludge-gathering trough are fitted with a clearance fit, and the rotating rod is connected to the side wall of the connecting bracket through a bearing seat, wherein the rotating rod and the bearing seat are connected by a rotatable connection.

[0011] As a preferred embodiment of this utility model, the connecting lever and the connecting slide groove are fitted with a clearance fit, the connecting rotating rod is connected to the side wall of the sedimentation tank through a bearing seat, wherein the connecting rotating rod and the bearing seat are connected by a rotational connection, and the connecting slide groove and the lever are fitted with a clearance fit.

[0012] As a preferred embodiment of this utility model, the limiting slide sleeve is provided with a connecting groove corresponding to the connecting slide rod, wherein the connecting slide rod and the connecting groove are connected by a sliding connection, and the connecting frustum and the fixing bolt are connected by a threaded connection.

[0013] As a preferred embodiment of this utility model, the connecting plate is provided with an enlarged hole corresponding to the fixing bolt, wherein the fixing bolt and the enlarged hole are fitted with a clearance fit, the connecting plate and the rotating support plate are rotatably connected by a rotating shaft, and the rotating support plate and the fixed connecting plate are rotatably connected by a rotating shaft.

[0014] As a preferred embodiment of this utility model, the two ends of the connecting rod are connected to the connecting slide rod by bearings, wherein the connection between the connecting rod and the bearing is a rotatable connection, and the connecting slide rod is provided with a through groove corresponding to the fixed connecting plate, wherein the cooperation between the fixed connecting plate and the through groove is a clearance fit.

[0015] As a preferred embodiment of this utility model, a connecting groove is provided on the sludge scraper and corresponding to the connecting clamp, wherein the connecting clamp and the connecting groove are fitted with a clearance fit. A limiting groove is provided at the bottom of the connecting slide rod and corresponding to the sludge scraper, wherein the sludge scraper and the limiting groove are fitted with a clearance fit.

[0016] This invention incorporates a movable sludge discharge structure. The drive motor in the movable sludge discharge structure drives the conveying auger to rotate via the transmission structure, which in turn drives the sludge scraper on the scraper fixing structure to move back and forth. This allows the sludge at the bottom of the sedimentation tank to be collected into the sludge collection box, thereby making the sludge cleaning more thorough.

[0017] This utility model includes a scraper fixing structure, which allows the sludge scraper to be replaced by rotating the fixing bolts in the scraper fixing structure via a transmission structure. When the sludge scraper is damaged, it can be quickly replaced without affecting the use of the device. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the isotropic structure of this utility model;

[0019] Figure 2 for Figure 1 Partial structural diagram;

[0020] Figure 3 This is a schematic diagram of the mobile sludge discharge structure of this utility model;

[0021] Figure 4 for Figure 3 A magnified structural diagram of A in the middle;

[0022] Figure 5This is a schematic diagram of the scraper fixing structure of this utility model;

[0023] Figure 6 for Figure 5 A partial structural diagram.

[0024] In the diagram: 1. Connecting base; 2. Sedimentation tank; 3. Movable sludge discharge structure; 4. Scraper fixing structure; 5. Sludge collection box; 6. Cleaning pump; 7. Controller; 8. Sludge discharge pipe; 9. Control valve; 300. Connecting bracket; 301. Drive motor; 302. Drive rod; 303. Conveying auger; 304. Drive bevel gear; 305. Driven bevel gear; 306. Rotating rod; 307. Rotating turntable; 308. Connecting lever; 309. Swinging plate; 310. Connecting chute; 311. Connecting rotating rod; 312. Actuating lever; 313. Connecting slide bar; 314. Limiting sleeve; 401. Connecting frustum; 402. Fixing bolt; 403. Connecting plate; 404. Rotating support plate; 405. Fixing plate; 406. Connecting rod; 407. Connecting clamp; 408. Sludge scraper. Detailed Implementation

[0025] The technical solutions of the present utility model will be clearly and completely described below with reference to the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the protection scope of the present utility model.

[0026] For an example, please refer to... Figure 1-6 This utility model provides a technical solution:

[0027] A sludge removal and air-lift device for sedimentation tanks includes a connecting base 1, a sedimentation tank 2 disposed on the end face of the connecting base 1, a movable sludge removal structure 3 disposed at the bottom of the inner cavity of the sedimentation tank 2, multiple sets of scraper fixing structures 4 connected to the movable sludge removal structure 3, a sludge collection box 5 connected to the side wall of the sedimentation tank 2, a blower 6 connected to the side wall of the sludge collection box 5, a sludge removal pipe 8 connected to the end face of the sludge collection box 5, a control valve 9 connected to the air inlet pipe of the blower 6, a controller 7 connected to the side wall of the sedimentation tank 2, and the air outlet of the blower 6 communicating with the inner cavity of the sludge collection box 5 through an air injection pipe, wherein a one-way valve is installed on the air injection pipe, the flow direction of the one-way valve is towards the inner cavity of the sludge collection box 5, and the sludge removal pipe 8 communicating with the inner cavity of the sludge collection box 5. The function of the one-way valve is to prevent the sludge in the sludge collection box 5 from flowing back to the blower 6.

[0028] Blower 6 is electrically connected to controller 7 via wires, and control valve 9 is electrically connected to controller 7 via wires. Controller 7 can control the operation of blower 6 and control valve 9. Blower 6 provides compressed air; air injection pipe of blower 6 injects air into the bottom of sludge discharge pipe 8; sludge discharge pipe 8 is installed vertically or at an angle to transport sludge to the collection point; control valve 9 regulates airflow and sludge discharge speed.

[0029] In summary, the blower 6 provides compressed air to discharge the sludge in the sludge collection box 5 through the sludge discharge pipe 8, thereby achieving the effect of air lifting.

[0030] In this embodiment, reference Figure 1 , Figure 2 , Figure 3 and Figure 4 The movable sludge discharge structure 3 includes a connecting bracket 300 and a drive motor 301. The connecting bracket 300 is connected to the side wall of the sedimentation tank 2. The drive motor 301 is connected to the end face of the connecting base 1 via a connecting seat. The drive end of the drive motor 301 is connected to a drive rod 302 via a coupling. One end of the drive rod 302, located inside the sedimentation tank 2, is connected to a conveying auger 303. A drive bevel gear 304 is connected to the side wall of the drive rod 302. A driven bevel gear 305 is symmetrically meshed with the side wall of the drive bevel gear 304. A rotating rod 306 is connected to the center of the driven bevel gear 305. The other end of the rotating rod 306 is connected to a rotating... A turntable 307 is provided, and a connecting lever 308 is connected to the side wall of the turntable 307. A swing plate 309 is provided on one side of the turntable 307. A connecting groove 310 is provided on the side wall of the swing plate 309 corresponding to the connecting lever 308. A connecting lever 311 is connected to the side wall of the connecting lever 308 and below the connecting groove 310. A toggle lever 312 is connected in the connecting groove 310 and above the connecting lever 308. A connecting slide rod 313 is connected to the side wall of the toggle lever 312. A limiting sleeve 314 is connected to the side wall of the connecting slide rod 313. The limiting sleeve 314 is connected to the side wall of the sedimentation tank 2.

[0031] Based on the above structure and its connection relationships, the controller 7 controls the drive motor 301. When the drive end of the drive motor 301 rotates, it sequentially drives the drive rod 302, the conveying auger 303, the drive bevel gear 304, the driven bevel gear 305, the rotating rod 306, and the rotating disk 307 to rotate. When the rotating disk 307 rotates, the connecting lever 308 on the rotating disk 307 drives the swing plate 309 to swing back and forth. When the rotating plate 309 swings back and forth, the connecting slide rod 313 moves back and forth in the inner cavity of the limiting slide sleeve 314 after the toggle lever 312 is activated. In turn, the connecting slide rod 313 drives the sludge scraper 408 on the scraper fixing structure 4 to move back and forth at the bottom of the inner cavity of the sedimentation tank 2, thereby scraping the sludge at the bottom of the sedimentation tank 2 into the inner cavity of the sedimentation tank 2 and into the sludge collection trough corresponding to the conveying auger 303. When the conveying auger 303 rotates, the sludge in the sludge collection trough is transported to the sludge collection box 5.

[0032] The drive motor 301 is electrically connected to the controller 7 via a wire, and the controller 7 can control the operation of the drive motor 301. The drive rod 302 is connected to the side wall of the connecting bracket 300 via a bearing seat, and the drive rod 302 is rotatably connected to the bearing seat. A sludge collection trough is provided in the inner cavity of the sedimentation tank 2, corresponding to the conveying auger 303. The conveying auger 303 and the sludge collection trough are fitted with a clearance fit. The rotating rod 306 is connected to the side wall of the connecting bracket 300 via a bearing seat, and the rotating rod 306 is rotatably connected to the bearing seat. When the drive motor 301 is running, it can drive the drive rod 302, the conveying auger 303 and the rotating rod 306 to rotate.

[0033] The connecting lever 308 and the connecting slide 310 are in a clearance fit. The connecting rotating rod 311 is connected to the side wall of the sedimentation tank 2 through a bearing seat. The connecting rotating rod 311 and the bearing seat are in a rotatable connection. The connecting slide 310 and the actuating lever 312 are in a clearance fit. The limiting sleeve 314 is provided with a connecting groove corresponding to the connecting slide 313. The connecting slide 313 and the connecting groove are in a sliding connection. When the rotating turntable 307 rotates, it can drive the connecting slide 313 to move back and forth in the connecting groove.

[0034] In this embodiment, reference Figure 1 , Figure 2 , Figure 5 and Figure 6The scraper fixing structure 4 includes a connecting frustum 401, which is connected to the end face of the connecting slide rod 313. A fixing bolt 402 is connected to the center of the connecting frustum 401. A connecting plate 403 is connected to the side wall of the fixing bolt 402. A rotating support plate 404 is connected to the side wall of the connecting plate 403. A fixing plate 405 is connected to one end of the rotating support plate 404. A connecting rod 406 is connected to the side wall of the fixing plate 405. A connecting clamp 407 is connected to the other end of the fixing plate 405. A sludge scraper 408 is connected to the connecting clamp 407.

[0035] Based on the above structure and the connection relationship of the above structure, the connecting groove on the sludge scraper 408 is aligned with the connecting clamp 407, and the sludge scraper 408 is located in the limiting groove at the bottom of the connecting slide rod 313. Then, the fixing bolt 402 is manually rotated, and the fixing bolt 402 moves downward. When the fixing bolt 402 moves downward, it drives the connecting plate 403 to move downward. When the connecting plate 403 moves downward, the connecting clamp 407 at one end of the fixing plate 405 is driven to close in the middle through the rotating support plate 404, thereby fixing the sludge scraper 408. The connection method between the connecting frustum 401 and the fixing bolt 402 is a threaded connection. The connecting plate 403 has an enlarged hole corresponding to the fixing bolt 402. The fixing bolt 402 and the enlarged hole are fitted with a clearance fit. When the fixing bolt 402 is rotated, it can drive the connecting plate 403 to move downward.

[0036] The connecting plate 403 and the rotating support plate 404 are rotatably connected by a rotating shaft. The rotating support plate 404 and the fixed connecting plate 405 are rotatably connected by a rotating shaft. The two ends of the connecting rod 406 are connected to the connecting slide rod 313 by bearings. The connecting rod 406 and the bearing are rotatably connected. The connecting slide rod 313 is provided with a through groove corresponding to the fixed connecting plate 405. The fixed connecting plate 405 and the through groove are fitted with a clearance fit. When the connecting plate 403 moves downward, it can drive one end of the two sets of fixed connecting plates 405 to fix the sludge scraper 408.

[0037] A connecting groove is provided on the sludge scraper 408 and corresponding to the connecting clamp 407. The connecting clamp 407 and the connecting groove are fitted with a clearance fit. A limiting groove is provided at the bottom of the connecting slide rod 313 and corresponding to the sludge scraper 408. The sludge scraper 408 and the limiting groove are fitted with a clearance fit to facilitate the fixing of the sludge scraper 408.

[0038] When using the sedimentation tank sludge removal and air-lift device, first connect the power supply to the device to put it into operation. The controller 7 controls the drive motor 301. When the drive motor 301 rotates, it drives the drive rod 302, the conveying auger 303, and the drive bevel gear 304 to rotate. The drive bevel gear 304 drives the driven bevel gear 305 to rotate, which in turn drives the rotating rod 306 to rotate. The rotating rod 306 then drives the rotating disc 307 to rotate. As the rotating disc 307 rotates, the connecting lever 308 on the rotating disc 307 drives the oscillating plate 309 to reciprocate. As the swing plate 309 swings back and forth, the lever 312 drives the connecting slide rod 313 to move back and forth in the inner cavity of the limiting slide sleeve 314. In turn, the connecting slide rod 313 drives the sludge scraper 408 on the scraper fixing structure 4 to move back and forth at the bottom of the inner cavity of the sedimentation tank 2, thereby scraping the sludge at the bottom of the sedimentation tank 2 into the inner cavity of the sedimentation tank 2 and into the sludge collection trough corresponding to the conveying auger 303. When the conveying auger 303 rotates, the sludge in the sludge collection trough is transported to the sludge collection box 5. Then, the controller 7 starts the cleaning pump 6, which discharges the sludge from the sludge collection box 5.

[0039] Align the connecting groove on the sludge scraper 408 with the connecting clamp 407, and position the sludge scraper 408 in the limiting groove at the bottom of the connecting slide bar 313. Then, manually rotate the fixing bolt 402. The fixing bolt 402 moves downward. When the fixing bolt 402 moves downward, it drives the connecting plate 403 to move downward. When the connecting plate 403 moves downward, it drives the fixing plate 405 to move through the rotating support plate 404. The connecting clamp 407 closes in the middle, thereby fixing the sludge scraper 408.

[0040] When the sludge scraper 408 needs to be replaced, manually rotate the fixing bolt 402 to move the fixing bolt 402 upward and loosen the fixing bolt 402. Then manually pry the fixing connecting plate 405 to separate the connecting clamp 407 at one end of the fixing connecting plate 405 from the sludge scraper 408. Then remove the sludge scraper 408 and replace it with a new sludge scraper 408.

[0041] 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 alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A sludge removal and air-lift device for sedimentation tanks, comprising a connecting base (1), characterized in that: A sedimentation tank (2) is provided on the end face of the connecting base (1). A movable sludge discharge structure (3) is provided at the bottom of the inner cavity of the sedimentation tank (2). Multiple scraper fixing structures (4) are connected to the movable sludge discharge structure (3). A sludge collection box (5) is connected to the side wall of the sedimentation tank (2). A blower (6) is connected to the side wall of the sludge collection box (5). A sludge discharge pipe (8) is connected to the end face of the sludge collection box (5). A control valve (9) is connected to the air inlet pipe of the blower (6). A controller (7) is connected to the side wall of the sedimentation tank (2). The air outlet of the blower (6) is connected to the inner cavity of the sludge collection box (5) through the air injection pipe. A one-way valve is installed on the air injection pipe. The flow direction of the one-way valve is towards the inner cavity of the sludge collection box (5). The sludge discharge pipe (8) is connected to the inner cavity of the sludge collection box (5). The mobile sludge discharge structure (3) includes a connecting bracket (300) and a drive motor (301). The connecting bracket (300) is connected to the side wall of the sedimentation tank (2). The drive motor (301) is connected to the end face of the connecting base (1) through a connecting seat. The drive end of the drive motor (301) is connected to a drive rod (302) through a coupling. One end of the drive rod (302) and located in the inner cavity of the sedimentation tank (2) is connected to a conveying auger (303). A drive bevel gear (304) is connected to the side wall of the drive rod (302). A driven bevel gear (305) is symmetrically meshed with the side wall of the drive bevel gear (304). A rotating rod (306) is connected to the center of the driven bevel gear (305). The other end of the rotating rod (306) is connected to a rotating... A turntable (307) is provided with a connecting lever (308) on its side wall. A swing plate (309) is provided on one side of the turntable (307). A connecting groove (310) is provided on the side wall of the swing plate (309) and corresponding to the connecting lever (308). A connecting rod (311) is connected on the side wall of the connecting lever (308) and below the connecting groove (310). A toggle lever (312) is connected in the connecting groove (310) and above the connecting lever (308). A connecting slide rod (313) is connected on the side wall of the toggle lever (312). A limiting sleeve (314) is connected on the side wall of the connecting slide rod (313). The limiting sleeve (314) is connected to the side wall of the sedimentation tank (2).

2. The sludge removal and air-lift device for a sedimentation tank according to claim 1, characterized in that: The scraper fixing structure (4) includes a connecting frustum (401), which is connected to the end face of the connecting slide rod (313). A fixing bolt (402) is connected to the center of the connecting frustum (401). A connecting plate (403) is connected to the side wall of the fixing bolt (402). A rotating support plate (404) is connected to the side wall of the connecting plate (403). A fixing plate (405) is connected to one end of the rotating support plate (404). A connecting rod (406) is connected to the side wall of the fixing plate (405). A connecting clamp (407) is connected to the other end of the fixing plate (405). A sludge scraper (408) is connected to the connecting clamp (407).

3. The sedimentation tank sludge removal and air-lift device according to claim 2, characterized in that: The blower (6) is connected to the controller (7) by a wire and the connection method is electrical connection. The control valve (9) is connected to the controller (7) by a wire and the connection method is electrical connection. The drive motor (301) is connected to the controller (7) by a wire and the connection method is electrical connection. The drive rod (302) is connected to the side wall of the connecting bracket (300) by a bearing seat, wherein the connection method between the drive rod (302) and the bearing seat is a rotatable connection.

4. The sedimentation tank sludge removal and air-lift device according to claim 2, characterized in that: The sedimentation tank (2) has a sludge collection trough connected to and corresponding to the conveying auger (303) in its inner cavity. The conveying auger (303) and the sludge collection trough are fitted with a clearance fit. The rotating rod (306) is connected to the side wall of the connecting bracket (300) through a bearing seat. The rotating rod (306) and the bearing seat are connected by a rotatable connection.

5. The sludge removal and air-lift device for a sedimentation tank according to claim 2, characterized in that: The connecting lever (308) and the connecting slide (310) are fitted with a clearance fit. The connecting rotating rod (311) is connected to the side wall of the sedimentation tank (2) through a bearing seat. The connecting rotating rod (311) and the bearing seat are connected by a rotational connection. The connecting slide (310) and the actuating lever (312) are fitted with a clearance fit.

6. The sludge removal and air-lift device for a sedimentation tank according to claim 2, characterized in that: The limiting sleeve (314) has a connecting groove corresponding to the connecting slide rod (313), wherein the connecting slide rod (313) and the connecting groove are connected by a sliding connection, and the connecting frustum (401) and the fixing bolt (402) are connected by a threaded connection.

7. The sludge removal and air-lift device for a sedimentation tank according to claim 2, characterized in that: The connecting plate (403) has an enlarged hole corresponding to the fixing bolt (402), wherein the fixing bolt (402) and the enlarged hole are fitted with a clearance fit. The connecting plate (403) and the rotating support plate (404) are rotatably connected by a rotating shaft. The rotating support plate (404) and the fixing plate (405) are rotatably connected by a rotating shaft.

8. The sludge removal and air-lift device for a sedimentation tank according to claim 2, characterized in that: The two ends of the connecting rod (406) are connected to the connecting slide rod (313) by bearings. The connection between the connecting rod (406) and the bearing is a rotatable connection. The connecting slide rod (313) is provided with a through groove corresponding to the fixed connecting plate (405). The fixed connecting plate (405) and the through groove are fitted with a clearance fit.

9. A sludge removal and air-lift device for a sedimentation tank according to claim 2, characterized in that: The sludge scraper (408) is provided with a connecting groove corresponding to the connecting clamp (407), wherein the connecting clamp (407) and the connecting groove are fitted with a clearance fit. The bottom of the connecting slide rod (313) is provided with a limiting groove corresponding to the sludge scraper (408), wherein the sludge scraper (408) and the limiting groove are fitted with a clearance fit.

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