CN214714576U

CN214714576U - Concrete sedimentation tank

Info

Publication number: CN214714576U
Application number: CN202120528900.9U
Authority: CN
Inventors: 程海培; 瞿永明; 李杭春
Original assignee: Hangzhou Yuhang Hengli Concrete Co ltd
Current assignee: Hangzhou Yuhang Hengli Concrete Co ltd
Priority date: 2021-03-12
Filing date: 2021-03-12
Publication date: 2021-11-16
Anticipated expiration: 2031-03-12

Abstract

The application relates to the field of sedimentation tanks, in particular to a concrete sedimentation tank which comprises a tank body, a mud scraping device, a separating device, a water receiving device and a mud receiving device, wherein the tank body is provided with a mud outlet and a water outlet; the water outlets are arranged in an inclined manner, and the sludge outlet is arranged below the water outlets; the mud scraping device comprises a mud scraping plate which is arranged in the tank body in a sliding mode along the vertical direction and a driving assembly which is used for driving the mud scraping plate to move close to or far away from the mud outlet in a sliding mode; the separating device comprises a water baffle for covering the water outlet and a mud baffle for covering the mud outlet; the water baffle is provided with a first driving piece, the mudguard is provided with a second driving piece, the water receiving device is connected with the water outlet, and the mud receiving device is connected with the mud outlet. The sedimentation tank in this application can be earlier through the position of adjusting the breakwater, makes the log raft in the sedimentation tank discharge to the water receiving device in, opens the fender again and discharges silt, improves the separation effect of muddy water.

Description

Concrete sedimentation tank

Technical Field

The application relates to the field of sedimentation tanks, in particular to a concrete sedimentation tank.

Background

The sedimentation tank is a structure for taking out suspended matters in water by using sedimentation, a large amount of concrete is mixed in liquid of a concrete mixer truck after the concrete mixer truck is cleaned at present, the concrete mixer truck is usually separated by a sand-stone separator for recycling, slurry is usually led into the sedimentation tank for sedimentation, cement of the slurry is deposited in the sedimentation tank, and water and the cement in the sedimentation tank are recycled, so that the water and the concrete are recycled.

The Chinese patent of the grant bulletin number CN210845383U, the grant publication date of 2020, 6 and 26 discloses a concrete sedimentation tank, which comprises a tank body and a support rod fixed on the lower side of the tank body, wherein a scraper is placed in the tank body, the lower side wall of the scraper is abutted against the inner wall of the lower side of the tank body, an installation block is fixed on the upper end of the outer wall of the tank body, a servo motor is installed on the installation block, a screw rod in threaded connection with the scraper is fixed on an output shaft of the servo motor, a discharge hole is formed in the lower end of the side wall of the tank body, and a sealing plate used for sealing the discharge hole is connected to the outer side of the tank body. This application labour saving and time saving, effect that work efficiency is high when having clearance cell body bottom.

In view of the above-mentioned related arts, the inventor believes that when sludge in a tank body is cleaned, water in the tank body needs to be discharged first, the depth of the sludge in the tank body is not determined, and during the process of water discharge, part of the sludge may be discharged together with supernatant, resulting in poor sludge-water separation effect.

SUMMERY OF THE UTILITY MODEL

In order to more effectively separate sludge and water in a sedimentation tank, the application provides a concrete sedimentation tank.

The application provides a concrete sedimentation tank adopts following technical scheme:

a concrete sedimentation tank comprises a tank body, a mud scraping device arranged on the tank body, a separating device used for separating mud and water in the tank body, a mud receiving device used for collecting mud and a water receiving device used for collecting water, wherein a mud outlet and a water outlet are formed in the side wall of one side of the tank body; the water outlets are arranged in an inclined manner, and the sludge outlet is arranged below the water outlets;

the mud scraping device comprises a mud scraping plate which is arranged in the tank body in a sliding mode along the vertical direction and a driving assembly which is used for driving the mud scraping plate to move close to or far away from the mud outlet in a sliding mode; the mud scraping plate is connected with the bottom surface and the side wall of the tank body in a sliding manner; the separation device comprises a water baffle for covering the water outlet and a mud guard for covering the mud outlet; the mud guard is provided with a water receiving device, the water receiving device is connected with the water outlet, and the mud receiving device is connected with the mud outlet.

When mud and water are required to be separated, the position of the water baffle can be adjusted at first, and the water outlets are arranged in an inclined mode, so that the water baffle can be exposed from top to bottom in sequence in the sliding process, and the situations of different water levels and different sludge heights can be met. The water flows out of the water outlet and enters the water receiving device. After the water in the cell body is drained away, the driving assembly is started to enable the mud scraping plate to move towards the mud outlet, the distance between the mud scraping plate and the rear wall is gradually reduced, the water level left between the mud scraping plate and the rear wall is made to be higher, and the mud scraping plate is continuously drained into the water receiving device. When water is discharged to a certain degree, the mud guard is controlled to be opened through the second driving piece, and at the moment, sludge on the bottom surface of the pool body enters the mud receiving device through the mud outlet. The process can better realize the separation of mud and water, and has better effect on different mud heights and different water level heights.

The application is further configured to: the upper end of fender rotates to be connected in the top inner wall of mud outlet, the outside top of mud outlet of cell body is provided with the holding surface, first driving piece is the pneumatic cylinder of rotation connection in holding surface below, the piston rod of pneumatic cylinder rotates to be connected in the fender outside one side towards the cell body.

The hydraulic cylinder is used for controlling the fender to be opened and closed, so that the whole fender is more stable, and the operation is more convenient.

The application is further configured to: two sides of the mud outlet are respectively provided with a butting block on the bottom surface of the tank body, and when the mud guard butts against the butting blocks, the mud guard completely blocks the mud outlet; the opposite surfaces of the two abutting blocks are inclined from one side close to the mud outlet to one side far away from the mud outlet to the direction far away from each other.

In above-mentioned technical scheme, the butt piece can make the fender shutoff mud outlet more steadily on the one hand, and the butt piece can lead silt to the mud outlet and converge through the inclined plane setting simultaneously, reduces the mud of mud scraper motion in-process silt in the residue of cell body bottom.

The application is further configured to: connect the mud device to include conveyer and be used for collecting the mud groove that connects of silt, conveyer accept in go out the mud mouth, conveyer keeps away from the one end of going out the mud mouth is accepted and is provided with and connects the mud groove.

By adopting the technical scheme, the sludge can be transported to the position where the sludge should be stored through the conveying belt, and the environment around the sedimentation tank is kept clean.

The application is further configured to: the conveying belt comprises a rack, a driving roller rotationally connected to the rack, a driving motor arranged on the rack and used for driving the driving roller to rotate, and a conveying belt arranged outside the driving roller in a matched manner; guard plates are arranged on two sides of the rack along the conveying direction of the conveying belt.

In above-mentioned technical scheme, through setting up the backplate, can make mud leak from conveyer's both sides easily, further reduce the peripheral silt of sedimentation tank and pile up the phenomenon and take place.

The application is further configured to: the water receiving device comprises a water tank, a water suction pump and a water receiving groove for receiving the water suction pump, the water tank covers all water outlets, and a water suction pipe is connected between the bottom of the water tank and the water suction pump.

By adopting the technical scheme, after the upper clear water of the sedimentation basin enters the water tank, the upper clear water enters the water receiving tank under the action of the water pump and is collected. The quick separation of mud and water is facilitated.

The application is further configured to: racks are fixedly arranged above the side wall of the tank body along the length direction; the driving assembly comprises a supporting block fixedly connected with the mud scraping plate, a rotating roller rotatably arranged on the supporting block and a servo motor arranged on the supporting block and used for driving the rotating shaft to rotate; a first gear is connected to an output shaft of the servo motor, two ends of the rotating roller are respectively provided with a second gear, and one of the second gears is meshed with the first gear; the second gear is meshed with the rack.

Through adopting above-mentioned technical scheme, start servo motor and drive first gear rotation and make second gear synchronous revolution, the second gear is at the rack with its meshing moves to drive the supporting shoe and move to the mud outlet, make the supporting shoe drive the mud scraper and move to the mud outlet, the mud scraper will be located the silt of cell body bottom and scrape to the mud outlet, thereby make silt discharge from the mud outlet. The setting of gear and rack makes the stability of mud scraper high to help improving the mud scraping efficiency of mud scraper.

The application is further configured to: the mud scraper is characterized in that first sliding grooves are formed in the side walls of the two sides of the mud scraper, first protruding strips are arranged on the side walls of the pool body and are arranged in the first sliding grooves in a sliding mode, and the length direction of the first protruding strips is perpendicular to the side walls, provided with mud outlets, of the sedimentation pool.

In above-mentioned technical scheme, limiting displacement of mud scraper in vertical direction can be restricted to the limiting displacement between first sand grip and the first spout, makes mud scraper strike off the silt of sedimentation tank bottom more steadily, improves the holistic stability of mud scraper.

The application is further configured to: and an inclined surface which is inclined towards the mud outlet from top to bottom is arranged on one side of the lower end of the mud scraping plate, which faces the mud outlet.

In the technical scheme, the mud deposited at the bottom of the tank body can be shoveled up through the inclined surface, and the mud can easily enter the mud outlet and be discharged, so that the sedimentation of the mud in the tank body can be further reduced.

The application is further provided with: the side wall of the sedimentation tank is provided with an avoidance opening, the water baffle plate is slidably arranged in the avoidance opening in a penetrating way and is attached to the side wall and the bottom surface of the avoidance opening, and the second driving piece comprises a first winch arranged above the sedimentation tank, a first traction rope wound on the first winch, a second winch arranged above the sedimentation tank and a second traction rope wound on the second winch; the first traction rope and the second traction rope are respectively connected to two sides of the water baffle, a first traction motor used for driving a first winch to rotate is arranged on the first winch, and a second traction motor used for driving a second winch to rotate is arranged on the second winch.

In the technical scheme, the first winch, the second winch, the first traction rope and the second traction rope are adopted to pull the water baffle to slide, so that the water baffle slides along the direction of the avoiding groove, the water baffle can move more stably, and the movement of the water baffle is convenient to control.

In summary, the present application includes at least one of the following benefits:

1. in this application, through setting up the delivery port that the slope was arranged to through the cooperation of fender and breakwater, can realize dealing with the mud-water separation effect of different mud height and water level height, can separate the clear water of the mud and the top of bottom of the pool more effectively.

2. In this application, through setting up second gear and rack to drive first gear and then drive second gear rotation through servo motor, make the scraper blade can move more steadily and strike off the silt of cell body bottom.

Drawings

FIG. 1 is a schematic structural diagram of a concrete sedimentation basin in the embodiment of the present application;

FIG. 2 is a schematic structural diagram of a mud receiving device and a water receiving device in the embodiment of the application;

fig. 3 is a schematic structural view of a driving assembly and a mud scraper in an embodiment of the present application.

Description of reference numerals: 1. a tank body; 11. a sludge outlet; 12. a water outlet; 13. a butting block; 14. avoiding the mouth; 15. a second convex strip; 16. a rack; 17. a first rib; 2. a mud scraping device; 21. a mud scraper; 211. a first chute; 22. a drive assembly; 221. a support block; 222. a servo motor; 223. a first gear; 224. a second gear; 225. a rotating roller; 3. a separation device; 31. a water baffle; 312. a second driving member; 313. a first capstan; 314. a second capstan; 315. a first pull cord; 316. a second pull cord; 317. a first traction motor; 318. a second traction motor; 32. a fender; 321. a support surface; 322. a hydraulic cylinder; 4. a mud receiving device; 41. a conveyor belt; 411. a frame; 412. a driving roller; 413. a conveyor belt; 414. a transmission motor; 415. a guard plate; 42. a mud receiving groove; 5. a water receiving device; 51. a water tank; 52. a water pump; 53. a water pumping pipe; 54. a water receiving tank.

Detailed Description

The present application is described in further detail below with reference to the attached drawings.

The embodiment of the application discloses concrete settling basin, refer to fig. 1, a concrete settling basin, including the cell body 1 that is the rectangle setting, set up mud scraping device 2 on cell body 1, be arranged in separating cell body 1 silt and the separator 3 of water, be arranged in collecting the water receiving device 5 that connects mud device 4 and be used for collecting water of silt.

Referring to fig. 1, a sludge outlet 11 is formed in a side wall of the tank body 1, the sludge outlet 11 is formed along a bottom surface of the tank body 1, four water outlets 12 are formed in the side wall of the tank body 1 above the sludge outlet 11, and the water outlets 12 are uniformly arranged in a straight line along an inclined direction. The separating apparatus 3 comprises a splash guard 31 covering all the water outlets 12 and a splash guard 32 covering the mud outlets. The water receiving device 5 comprises a water tank 51 fixedly arranged on the outer wall of the tank body 1, a water pump 52 and a water receiving tank 54 for receiving the water pump 52; the water tank 51 is fixedly arranged on the outer wall of the tank body 1 and covers all the water outlets 12, a water pumping pipe 53 is arranged between the water pumping pump 52 and the water tank 51, and the water pumping pipe 53 is connected to the bottom surface of the water tank 51.

Referring to fig. 1 and 2, the mud receiving device 4 includes a conveyor belt 41 received in the mud outlet 11 and a mud receiving groove 42 receiving one side of the conveyor belt 41 far from the mud outlet 11, the conveyor belt 41 includes a frame 411, a driving roller 412 rotatably disposed on the frame 411, a transmission motor 414 disposed on the frame 411 and used for driving the driving roller 412 to rotate, and a conveyor belt 413 disposed outside the rotating roller 225 in a matching manner, guard plates 415 are fixedly disposed on two sides of the conveyor belt 413 on the upper surface of the frame 411 in a vertical direction, and a length direction of the guard plates 415 is parallel to a moving direction of the conveyor belt 413.

Referring to fig. 1 and 2, the upper end of the mudguard 32 is rotatably connected to the upper surface of the sludge outlet 11, a first driving member for driving the mudguard 32 to rotate is arranged on the mudguard 32, a horizontal supporting surface 321 is arranged on the outer wall of the tank body 1, the first driving member is two hydraulic cylinders 322 rotatably arranged on the supporting surface 321, the hydraulic cylinders 322 are arranged in a downward inclined manner, and piston rods of the hydraulic cylinders 322 are rotatably connected to one side of the mudguard 32 facing the outside of the tank body 1. On the bottom surface of cell body 1, the both sides that are close to the cell body 1 and offer the lateral wall of one side of delivery port 12 respectively are provided with a butt joint piece 13, and the one side that two butt joint pieces 13 are in the opposite directions slope of keeping away from each other to the one side of keeping away from mud outlet 11 from being close to mud outlet 11. When the mud guard 32 abuts against the abutting block 13, the mud guard 32 completely blocks the mud outlet 11.

Referring to fig. 1 and 2, an avoiding opening 14 for accommodating a water baffle 31 is formed in the side wall of the tank body 1, the water baffle 31 penetrates through the avoiding opening 14, and the water baffle 31 is connected with the side wall and the bottom surface of the avoiding opening 14 in a sliding manner. A second convex strip 15 parallel to the length direction of the avoidance port 14 is fixedly arranged on the side wall of the avoidance port 14, the second convex strip 15 extends to the side wall of the tank body 1, and a second sliding groove for slidably clamping the second convex strip 15 is arranged on the water baffle 31. A second driving member 312 for driving the water deflector 31 to slide along the escape opening 14 is disposed on the water deflector 31, and the second driving member 312 includes two first and

second winches

313 and 314 disposed above the tank body 1, and a first traction rope 315 wound on the first winch 313 and a second traction rope 316 wound on the second winch 314. The first winch 313 is located at one end of the side wall of the pool body 1, which is provided with the water outlet 12, far away from the avoiding opening 14, the first hauling rope 315 is fixedly connected to one side of the water baffle 31, which is far away from the avoiding opening 14, the second winch 314 is located at one end of the avoiding opening 14, which is far away from the pool body 1, and the second hauling rope 316 is fixedly connected to one side of the water baffle 31, which is close to the second winch 314. A first traction motor 317 for driving the first capstan 313 to rotate is provided on the first capstan 313, and a second traction motor 318 for driving the second capstan 314 to rotate is provided on the second capstan 314.

According to the water level height in the pool body 1, the water baffle 31 is pulled to expose the water outlet 12 with the height corresponding to the water level, and water enters the water pumping box 51 from the water outlet 12. The suction pump 52 is started, and the water in the suction box 51 is pumped to the water receiving tank 54 to be collected. After the water in the tank body 1 is drained away, the water baffle 31 is reset, the mud guard 32 is pulled, and the concrete at the bottom of the tank body 1 enters the conveying belt 41 through the mud outlet 11. The conveyor belt 41 transports the concrete to a mud collection trough 42 for collection.

Referring to fig. 1 and 3, racks 16 are fixedly arranged on the side walls of both sides of the tank body 1. The mud scraping device 2 comprises a mud scraping plate 21 which is arranged in the pool body 1 in a sliding mode and a driving assembly 22 which is used for driving the mud scraping plate 21 to move towards the side close to the water outlet 12 or away from the water outlet 12. The side edge of the mud scraper 21 is connected with the tank body 1 in a sliding way along the length direction, and the bottom edge of the mud scraper 21 is connected with the tank body 1 in a sliding way. The side wall of the tank body 1 is fixedly provided with a first convex strip 17, the side wall of the mud scraping plate 21 is provided with a first sliding groove 211 for slidably connecting the first convex strip 17, and the length direction of the first convex strip 17 is perpendicular to the side wall of the tank body 1 provided with one side of the mud outlet 11. One end of the mud scraping plate 21 close to the bottom surface of the tank body 1 is provided with an inclined plane which inclines from bottom to top in the direction far away from the mud outlet 11.

Referring to fig. 1 and 3, the driving assembly 22 includes a supporting block 221, a servo motor 222 and a rotating roller 225, the supporting block 221 is fixedly connected to the upper end of the scraper 21, a through hole is formed in the supporting block 221, and the axis of the through hole is perpendicular to the moving direction of the scraper 21; the rotating roller 225 is rotatably coupled to the perforation. The servo motor 222 is fixedly arranged at the upper end of the supporting block 221, the output shaft of the servo motor 222 is parallel to the rotating roller 225, and a first gear 223 is arranged on the output shaft; both ends of the rotating roller 222 are provided with second gears 224; the first gear 223 meshes with one of the second gears 224; both second gears 224 mesh with the rack 16.

The servo motor 222 is activated so that the rotating roller 225 rotates the first gear 223 and the second gear 224, and the first gear 223 and the second gear 224 move on the rack 16 so that the supporting block 221 moves the scraper 21 in a direction approaching the sludge outlet 11. The mud scraper 21 pushes the concrete at the bottom of the tank body 1 to the mud outlet 11 and then to the conveying belt 41.

The implementation principle of a concrete sedimentation tank in the embodiment of the application is as follows: when more sludge is deposited in the tank body 1, the water baffle 31 can be pulled by the first driving piece according to the height of the water level in the tank body 1 until the water outlet 12 corresponding to the water level is exposed. The upper layer clear water in the tank body 1 enters the water tank 51 and enters the water receiving tank 54 through the water suction pump 52 for storage or other processes. Meanwhile, the servo motor 222 drives the second gear 224 to rotate and drives the first gear 223 to rotate, so that the mud scraping plate 21 moves to a side close to the mud outlet 11 and the water outlet 12, thereby pushing the mud to a direction close to the mud outlet 11 and raising the water level, so that the upper layer clean water is continuously discharged from the water outlet 12.

When the height of the bottom sludge is higher than the height of the sludge outlet 11, the mud guard 32 can be driven to open by the second driving member 312, and the sludge falls into the sludge receiving device 4 through the sludge outlet 11.

The servo motor 222 is started to drive the rotating roller 225 to rotate, so that the supporting block 221 drives the mud scraping plate 21 to move towards the mud outlet 11, and the mud settled at the bottom of the pool is pushed towards the mud outlet 11 and is transported to the mud receiving groove 42 to be collected under the action of the conveying belt 41.

The above embodiments are preferred embodiments of the present application, and the protection scope of the present application is not limited by the above embodiments, so: all equivalent changes made according to the structure, shape and principle of the present application shall be covered by the protection scope of the present application.

Claims

1. The utility model provides a concrete sedimentation tank which characterized in that: the sludge separation device comprises a tank body (1), a sludge scraping device (2) arranged on the tank body (1), a separating device (3) used for separating sludge and water in the tank body (1), a sludge receiving device (4) used for collecting sludge and a water receiving device (5) used for collecting water, wherein a sludge outlet (11) and a water outlet (12) are formed in the side wall of one side of the tank body (1); the water outlets (12) are arranged in an inclined manner, and the sludge outlets (11) are arranged below the water outlets (12);

the mud scraping device (2) comprises a mud scraping plate (21) which is arranged in the tank body (1) in a sliding mode along the vertical direction and a driving assembly (22) which is used for driving the mud scraping plate (21) to approach or be far away from the mud outlet (11) in a sliding mode; the mud scraping plate (21) is connected with the bottom surface and the side wall of the tank body (1) in a sliding manner; the separation device (3) comprises a water baffle (31) covering the water outlet (12) and a mud guard (32) covering the mud outlet; be provided with on breakwater (31) and be used for driving breakwater (31) along the gliding first driving piece of horizontal direction, be provided with on fender (32) and be used for driving fender (32) to open and expose second driving piece (312) of mud outlet (11), water receiving device (5) accept in delivery port (12), connect mud device (4) accept in mud outlet (11).

2. A concrete sedimentation tank as claimed in claim 1, wherein: the upper end of fender (32) is rotated and is connected in the top inner wall of mud outlet (11), cell body (1) outer top in mud outlet (11) is provided with holding surface (321), first driving piece is for rotating hydraulic cylinder (322) of connecting in holding surface (321) below, the piston rod of hydraulic cylinder (322) rotates and connects in fender (32) one side outside towards the cell body.

3. A concrete sedimentation tank as claimed in claim 2, wherein an abutment block (13) is provided on the bottom surface of the tank body (1) on each side of the sludge outlet (11), the sludge outlet (11) being completely blocked by the sludge guard (32) when the sludge guard (32) abuts against the abutment block (13); the opposite surfaces of the two abutting blocks (13) are inclined from one side close to the mud outlet (11) to one side far away from the mud outlet (11) to the direction far away from each other.

4. A concrete settling tank as claimed in claim 2, wherein: connect mud device (4) to include conveyor belt (41) and be used for collecting mud connect mud groove (42), conveyor belt (41) accept in go out mud mouth (11), conveyor belt (41) are kept away from the one end of going out mud mouth (11) is accepted and is provided with and connects mud groove (42).

5. A concrete sedimentation tank as claimed in claim 4, wherein: the conveying belt (41) comprises a rack (411), a driving roller (412) rotationally connected to the rack (411), a driving motor (414) arranged on the rack (411) and used for driving the driving roller (412) to rotate, and a conveying belt (413) arranged outside the driving roller (412) in a matched mode; both sides of the rack (411) are provided with guard plates (415) along the transmission direction of the conveying belt (41).

6. A concrete sedimentation tank as claimed in claim 1, wherein: water receiving device (5) include water tank (51), suction pump (52) and accept water receiving tank (54) of suction pump (52), water tank (51) cover all delivery ports (12), be connected with drinking-water pipe (53) between the bottom of water tank (51) and suction pump (52).

7. A concrete sedimentation tank as claimed in claim 1, wherein: a rack (16) is fixedly arranged above the side wall of the tank body (1) along the length direction; the driving assembly (22) comprises a supporting block (221) fixedly connected with the mud scraping plate (21), a rotating roller (225) rotatably arranged on the supporting block (221) and a servo motor (222) arranged on the supporting block (221) and used for driving a rotating shaft to rotate; a first gear (223) is connected to an output shaft of the servo motor (222), two ends of the rotating roller (225) are respectively provided with a second gear (224), and one second gear (224) is meshed with the first gear (223); the second gear (224) is engaged with the rack (16).

8. A concrete sedimentation tank as claimed in claim 1, wherein: first sliding grooves (211) are formed in the side walls of the two sides of the mud scraping plate (21), first protruding strips (17) are arranged on the side wall of the tank body (1), the first protruding strips (17) are arranged in the first sliding grooves (211) in a sliding mode, and the length direction of the first protruding strips (17) is perpendicular to the side wall of the sedimentation tank, wherein a mud outlet (11) is formed in the sedimentation tank.

9. A concrete sedimentation tank as claimed in claim 1, wherein: the lower end of one side of the lower end of the mud scraping plate (21) facing the mud outlet (11) is provided with an inclined surface which inclines towards the mud outlet (11) from top to bottom.

10. The concrete sedimentation tank according to claim 1, wherein a dodging opening (14) is formed in a side wall of the tank body (1), and the dodging opening (14) is formed in a side wall of the tank body (1) close to the lower water outlet (12); the water baffle (31) penetrates through the avoidance opening (14) in a sliding mode, the water baffle (31) is attached to the side wall and the bottom face of the avoidance opening (14), and the second driving piece (312) comprises a first winch (313) arranged above the sedimentation tank, a first traction rope (315) wound on the first winch (313), a second winch (314) arranged above the sedimentation tank and a second traction rope (316) wound on the second winch (314); the first traction rope (315) and the second traction rope (316) are connected to two sides of the water baffle (31) respectively, a first traction motor (317) used for driving the first winch (313) to rotate is arranged on the first winch (313), and a second traction motor (318) used for driving the second winch (314) to rotate is arranged on the second winch (314).