A device and method for screening sewage network sediments

Abstract

The application discloses a sewage pipe network silt screening device and method, relates to the technical field of sludge treatment, and comprises a dilution tank, a screening tank, a stirring and dilution mechanism, a screening mechanism and a pressurizing mechanism. The side wall upper end of the dilution tank is provided with a feeding pipe. The side wall lower end of the dilution tank is provided with a sewage discharge pipe. The sewage discharge pipe far from the dilution tank is installed on the side wall upper end of the screening tank. Water is added to the inside of the dilution tank through the water inlet pipe, and then the sewage is stirred through the stirring rod, so that the slurry in the sewage is diluted, and the slurry in the sewage is prevented from being too thick. The slurry water is filtered through the slurry water filter screen. The filtered water falls to the bottom of the screening tank, and then the water at the bottom of the screening tank is retransported to the inside of the dilution tank through the backwater pipe, so that the water is recycled and used, and the waste of water resources is reduced. The application improves the silt filtering and slurry water filtering efficiency through the pressurizing and pushing mode.

Description

Technical Field

[0001] This invention relates to the field of sludge treatment technology, specifically to a sludge screening device and method for sewage pipe networks. Background Technology

[0002] Due to issues such as combined sewer overflows and infrastructure construction, a large amount of silt and sand is discharged into the sewage pipe network. The grit chambers of the sewage treatment plant are not effective, resulting in low organic matter content and high sand content in the sludge. On the one hand, this leads to low biogas production from anaerobic digestion and poor economic benefits. On the other hand, the large amount of sand deposited and compacted in the digester not only reduces the effective tank volume and affects the stable operation of the facilities, but also aggravates equipment wear.

[0003] To address the aforementioned problems, an improved silt and sand screening device and method for sewage pipe networks is now designed. Summary of the Invention

[0004] The purpose of this invention is to provide a silt screening device and method for sewage pipe networks to solve the problems mentioned in the background art.

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

[0006] A sludge screening device for a sewage pipe network includes a dilution tank, a screening tank, a stirring and dilution mechanism, a screening mechanism, and a pressurizing mechanism. An inlet pipe for adding sewage into the dilution tank is installed on the upper side wall of the dilution tank, and a drain pipe for conveying diluted sewage to the screening tank is installed on the lower side wall of the dilution tank. The end of the drain pipe furthest from the dilution tank is installed on the upper side wall of the screening tank. The dilution tank, drain pipe, and screening tank are interconnected. A first water pump for moving sewage from the dilution tank to the screening tank is installed on the drain pipe.

[0007] The stirring and dilution mechanism is located inside the dilution tank and is used to add water to the sewage, stir and dilute the sewage, disperse the mud in the sewage, and facilitate the filtration of the mud.

[0008] The screening mechanism is located inside the screening tank and is used to screen the mud and sand first, then the muddy water, and to transport the screened water back into the dilution tank, thereby reducing the waste of water resources.

[0009] The pressurization mechanism is located inside the screening tank to accelerate the screening speed of mud and sand.

[0010] As a further aspect of the present invention: the stirring and dilution mechanism includes a motor, an inlet pipe for replenishing water into the dilution tank is installed on the upper side wall of the dilution tank, a motor is installed at the center of the upper end of the dilution tank, a rotating shaft is installed at the output end of the motor, the lower end of the rotating shaft passes through the top of the dilution tank and is rotatably connected to the center of the bottom of the dilution tank, and several stirring rods for stirring and diluting wastewater are horizontally installed on the side wall of the rotating shaft inside the dilution tank.

[0011] As a further embodiment of the present invention: the screening mechanism includes a sand filter screen, which is horizontally installed on the inner wall of the screening tank. A sand discharge port for discharging sand is provided on the side wall of the screening tank above the sand filter screen. A mud-water filter screen is horizontally installed on the inner wall of the screening tank below the sand filter screen. A mud discharge port for discharging mud is provided on the side wall of the screening tank above the mud-water filter screen. Both the sand discharge port and the mud discharge port are equipped with sealing doors. A reflux component for conveying the screened and filtered water to the inside of the dilution tank is provided on the side wall of the screening tank below the mud-water filter screen.

[0012] As a further embodiment of the present invention: the return assembly includes a return water pipe, one end of which is installed on the side wall of the screening tank below the mud and water filter screen, and the other end of which is installed on the upper side wall of the dilution tank away from the screening tank. The dilution tank, the return water pipe and the screening tank are interconnected, and a second water pump for moving water from the screening tank to the dilution tank is installed on the return water pipe.

[0013] As a further embodiment of the present invention: the pressurizing mechanism includes a reciprocating hydraulic telescopic rod; the lower ends of both the sand filter and the mud-water filter are equipped with support frames; the support frames are horizontally installed on the inner wall of the screening tank; and several sealing columns are vertically installed on the upper end of the support frames. The sand filter and the mud-water filter are respectively fitted onto the side walls of the corresponding sealing columns. The height of the sealing columns is less than half the distance between the mud-water filter and the sand filter, and less than half the distance between the sand filter and the top of the screening tank. The reciprocating hydraulic telescopic rod is installed... At the top of the screening tank, a first pressure plate is installed at the output end of the reciprocating hydraulic telescopic rod to move the sewage at the top of the sludge filter screen. The side wall of the first pressure plate is slidably and sealed to the inner wall of the screening tank. A connecting rod is vertically installed at the lower end of the first pressure plate. The lower end of the connecting rod passes through the sludge filter screen and the support frame to install a second pressure plate for moving the sewage at the top of the sludge filter screen. The side wall of the second pressure plate is slidably and sealed to the inner wall of the screening tank. Both the first and second pressure plates have perforations to facilitate the passage of sewage. The perforations cooperate with the sealing column.

[0014] As a further aspect of the present invention: a first one-way valve is installed on the drain pipe between the first water pump and the screening tank, which only allows wastewater to move from the dilution tank to the screening tank.

[0015] As a further aspect of the present invention: a second one-way valve is installed on the return water pipe between the second water pump and the dilution tank, which only allows water to move from the screening tank to the dilution tank.

[0016] As a further embodiment of the present invention: the bottom of the screening tank is equipped with a guide plate to facilitate the collection of water to the inlet end of the return water pipe.

[0017] As a further aspect of the present invention: sealing rubber rings are installed on the side walls of both the first pressure plate and the second pressure plate.

[0018] A method for using a sediment screening device for a sewage pipe network includes the following steps:

[0019] Step 1: First, add the wastewater into the dilution tank through the feed pipe, and add a certain amount of water into the dilution tank through the water inlet pipe. Then, start the motor. The output end of the motor drives the rotating shaft to rotate, and the rotating shaft drives the stirring rod to rotate. The stirring rod stirs the wastewater, thereby diluting the sludge in the wastewater.

[0020] Step Two: Start the first water pump. The first water pump transports the diluted wastewater inside the dilution tank to the screening tank through the drain pipe. Then, start the reciprocating hydraulic telescopic rod. The output end of the reciprocating hydraulic telescopic rod drives the first pressure plate, connecting rod, and second pressure plate upward. The first and second pressure plates drive the perforation upward, disengaging the perforation from the sealing column, thus allowing the wastewater to pass through the perforation and enter the sludge filter screen and mud-water filter screen. Then, the output end of the reciprocating hydraulic telescopic rod drives the first pressure plate, connecting rod, and second pressure plate downward. The first and second pressure plates drive the perforation downward, fitting onto the side wall of the sealing column and continuing to move. The first pressure plate pressurizes and pushes the wastewater above the sludge filter screen, causing the sludge in the wastewater to quickly pass through the sludge filter screen. The second pressure plate pressurizes and pushes the wastewater above the mud-water filter screen, causing the water in the wastewater to quickly pass through the mud-water filter screen, thus achieving sludge and mud-water filtration in the wastewater.

[0021] Step 3: Start the second water pump. The second water pump will return the water from the bottom of the screening tank to the inside of the dilution tank through the return water pipe, thereby realizing water recycling and reducing water waste.

[0022] Compared with the prior art, the beneficial effects of the present invention are:

[0023] 1. This invention filters the silt in sewage, removes sand from the sewage, reduces the sand content in the sludge, improves the efficiency of subsequent sludge treatment, and extends the service life of the equipment.

[0024] 2. This invention adds water to the inside of the dilution tank through the water inlet pipe, and then stirs the sewage with a stirring rod to dilute the mud in the sewage, thereby preventing the mud in the sewage from being too viscous, facilitating the filtration of sewage, and improving the efficiency of sewage screening and filtration.

[0025] 3. This invention filters mud and water through a mud and water filter screen. The filtered water falls to the bottom of the screening tank, and then the water at the bottom of the screening tank is transported back to the inside of the dilution tank through a return water pipe, realizing water recycling and reducing water waste.

[0026] 4. When the first pressure plate, connecting rod, and second pressure plate move upward, the perforation disengages from the sealing column, allowing sewage to pass through the perforation and enter the sludge filter screen and mud-water filter screen. When the first pressure plate, connecting rod, and second pressure plate move downward, the perforation fits onto the side wall of the sealing column. Continuing to move, the first pressure plate pressurizes and pushes the sewage above the sludge filter screen, causing the sludge in the sewage to quickly pass through the sludge filter screen. The second pressure plate pressurizes and pushes the sewage above the mud-water filter screen, causing the water in the sewage to quickly pass through the mud-water filter screen. By using this pressurized pushing method, the efficiency of sludge and mud-water filtration in sewage is improved, making it convenient for users. Attached Figure Description

[0027] Figure 1 This is a three-dimensional structural diagram of the present invention.

[0028] Figure 2 This is a schematic diagram of the structure of the present invention.

[0029] Figure 3 This is a schematic diagram of the pressurization mechanism in this invention.

[0030] Figure 4 This is a schematic diagram of the screening mechanism in this invention.

[0031] The components are as follows: 1. Dilution tank; 2. Feed pipe; 3. Motor; 4. Sewage pipe; 5. First check valve; 6. Reciprocating hydraulic telescopic rod; 7. Screening tank; 8. Sealing door; 9. Second check valve; 10. First water pump; 11. Second water pump; 12. Return water pipe; 13. Stirring rod; 14. Rotating shaft; 15. Sediment filter screen; 16. First pressure plate; 17. Connecting rod; 18. Sealing column; 19. Support frame; 20. Mud and water filter screen; 21. Perforation; 22. Sand discharge port; 23. Sludge discharge port; 24. Second pressure plate; 25. Water inlet pipe. Detailed Implementation

[0032] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0033] Please see Figures 1-4 In this embodiment of the invention, a sludge screening device for a sewage pipe network includes a dilution tank 1, a screening tank 7, a stirring and dilution mechanism, a screening mechanism, and a pressurizing mechanism. An inlet pipe 2 for adding sewage into the dilution tank 1 is installed on the upper side wall of the dilution tank 1. A drain pipe 4 for conveying diluted sewage to the screening tank 7 is installed on the lower side wall of the dilution tank 1. The end of the drain pipe 4 away from the dilution tank 1 is installed on the upper side wall of the screening tank 7. The dilution tank 1, the drain pipe 4, and the screening tank 7 are interconnected. A first water pump 10 for moving sewage from the dilution tank 1 to the screening tank 7 is installed on the drain pipe 4. A first one-way valve 5, which only allows sewage to move from the dilution tank 1 to the screening tank 7, is installed on the drain pipe 4 between the first water pump 10 and the screening tank 7.

[0034] The stirring and dilution mechanism is installed inside the dilution tank 1 and is used to add water to the sewage, stir and dilute the sewage, disperse the mud in the sewage, and facilitate the filtration of the mud.

[0035] The screening mechanism is located inside the screening tank 7. It is used to screen the mud and sand first, then screen the muddy water, and then transport the screened water back into the dilution tank 1 to reduce the waste of water resources.

[0036] The pressurization mechanism is located inside the screening tank 7 to accelerate the screening speed of mud and sand and muddy water.

[0037] The stirring and dilution mechanism includes a motor 3. A water inlet pipe 25 for replenishing water into the dilution tank 1 is installed on the upper side wall of the dilution tank 1. The motor 3 is installed at the center of the upper end of the dilution tank 1. A rotating shaft 14 is installed at the output end of the motor 3. The lower end of the rotating shaft 14 passes through the top of the dilution tank 1 and is rotatably connected to the center of the bottom of the dilution tank 1. Several stirring rods 13 for stirring and diluting wastewater are horizontally installed on the side wall of the rotating shaft 14 inside the dilution tank 1.

[0038] In use, wastewater is added into the dilution tank 1 through the feed pipe 2, and a certain amount of water is added into the dilution tank 1 through the water inlet pipe 25. Then, the motor 3 is started, and the output end of the motor 3 drives the rotating shaft 14 to rotate. The rotating shaft 14 drives the stirring rod 13 to rotate, and the stirring rod 13 stirs the wastewater, thereby diluting the mud in the wastewater, preventing the mud in the wastewater from being too viscous, facilitating the filtration of wastewater, and improving the efficiency of wastewater screening and filtration.

[0039] The screening mechanism includes a sand filter screen 15, which is horizontally installed on the inner wall of the screening tank 7. A sand discharge port 22 for discharging sand is provided on the side wall of the screening tank 7 above the sand filter screen 15. A mud and water filter screen 20 is horizontally installed on the inner wall of the screening tank 7 below the sand filter screen 15. A mud discharge port 23 for discharging mud is provided on the side wall of the screening tank 7 above the mud and water filter screen 20. Both the sand discharge port 22 and the mud discharge port 23 are equipped with sealing doors 8. A reflux component for conveying the screened and filtered water to the inside of the dilution tank 1 is provided on the side wall of the screening tank 7 below the mud and water filter screen 20.

[0040] The return assembly includes a return water pipe 12. One end of the return water pipe 12 is installed on the side wall of the screening tank 7 below the mud and water filter screen 20, and the other end of the return water pipe 12 away from the screening tank 7 is installed on the upper side wall of the dilution tank 1. The dilution tank 1, the return water pipe 12 and the screening tank 7 are interconnected. A second water pump 11 for moving water from the screening tank 7 to the dilution tank 1 is installed on the return water pipe 12 between the second water pump 11 and the dilution tank 1. A second one-way valve 9 that only allows water to move from the screening tank 7 to the dilution tank 1 is installed on the return water pipe 12 between the second water pump 11 and the dilution tank 1.

[0041] In use, the first water pump 10 is started, and the first water pump 10 transports the diluted wastewater inside the dilution tank 1 to the mud and sand filter screen 15 inside the screening tank 7 through the sewage pipe 4. The mud and sand filter screen 15 filters the mud and sand in the wastewater, and the filtered mud and water fall onto the mud and water filter screen 20. The mud and water filter screen 20 filters the mud and water, and the filtered water falls to the bottom of the screening tank 7, thereby realizing the screening of mud, sand and water in the wastewater. Then the second water pump 11 is started, and the second water pump 11 transports the water at the bottom of the screening tank 7 back into the dilution tank 1 through the return water pipe 12, realizing the recycling of water and reducing the waste of water resources.

[0042] The pressurizing mechanism includes a reciprocating hydraulic telescopic rod 6. Support frames 19 are installed at the lower ends of both the sand filter 15 and the mud-water filter 20. The support frames 19 are horizontally installed on the inner wall of the screening tank 7. Several sealing columns 18 are vertically installed at the upper end of the support frames 19. The sand filter 15 and the mud-water filter 20 are respectively fitted onto the side walls of their corresponding sealing columns 18. The height of each sealing column 18 is less than half the distance between the mud-water filter 20 and the sand filter 15, and less than half the distance between the sand filter 15 and the top of the screening tank 7. The reciprocating hydraulic telescopic rod 6 is installed on the top of the screening tank 7. The output end of the reciprocating hydraulic telescopic rod 6 is equipped with a first pressure plate 16 for moving the sewage at the upper end of the silt filter screen 15. The side wall of the first pressure plate 16 is slidably and sealed to the inner wall of the screening tank 7. A connecting rod 17 is vertically installed at the lower end of the first pressure plate 16. The lower end of the connecting rod 17 passes through the silt filter screen 15 and the support frame 19 and is equipped with a second pressure plate 24 for moving the sewage at the upper end of the mud and water filter screen 20. The side wall of the second pressure plate 24 is slidably and sealed to the inner wall of the screening tank 7. Both the first pressure plate 16 and the second pressure plate 24 are provided with perforations 21 to facilitate the passage of sewage. The perforations 21 cooperate with the sealing column 18.

[0043] In use, the reciprocating hydraulic telescopic rod 6 is activated. The output end of the reciprocating hydraulic telescopic rod 6 drives the first pressure plate 16, connecting rod 17, and second pressure plate 24 to move upward. The first pressure plate 16 and second pressure plate 24 drive the perforation 21 to move upward, and the perforation 21 disengages from the sealing column 18, thereby allowing sewage to pass through the perforation 21 and enter the silt filter screen 15 and mud filter screen 20. Then, the output end of the reciprocating hydraulic telescopic rod 6 drives the first pressure plate 16, connecting rod 17, and second pressure plate 24 to move downward. The pressure plate 16 and the second pressure plate 24 drive the perforation 21 to move downwards. The perforation 21 fits onto the side wall of the sealing column 18 and continues to move. The first pressure plate 16 presses and pushes the sewage above the sludge filter screen 15, causing the sludge in the sewage to quickly pass through the sludge filter screen 15. The second pressure plate 24 presses and pushes the sewage above the mud and water filter screen 20, causing the water in the sewage to quickly pass through the mud and water filter screen 20. By pressurizing and pushing, the efficiency of sludge and mud and water filtration in sewage is improved, making it easier for users to use.

[0044] The working principle of a sludge screening device for a sewage pipe network: When in use, sewage is added into the dilution tank 1 through the feed pipe 2, and a certain amount of water is added into the dilution tank 1 through the water inlet pipe 25. Then, the motor 3 is started, and the output end of the motor 3 drives the rotating shaft 14 to rotate. The rotating shaft 14 drives the stirring rod 13 to rotate, and the stirring rod 13 stirs the sewage, thereby diluting the sludge in the sewage.

[0045] Then, the first water pump 10 is started. The first water pump 10 transports the diluted wastewater inside the dilution tank 1 to the inside of the screening tank 7 through the drain pipe 4. Then, the reciprocating hydraulic telescopic rod 6 is started. The output end of the reciprocating hydraulic telescopic rod 6 drives the first pressure plate 16, the connecting rod 17 and the second pressure plate 24 to move upward. The first pressure plate 16 and the second pressure plate 24 drive the perforation 21 to move upward. The perforation 21 disengages from the sealing column 18, so that the wastewater passes through the perforation 21 and enters the mud and sand filter screen 15 and the mud and water filter screen 20. Then, the reciprocating hydraulic telescopic rod 6... The output end drives the first pressure plate 16, connecting rod 17 and second pressure plate 24 to move downward. The first pressure plate 16 and second pressure plate 24 drive the perforation 21 to move downward. The perforation 21 fits on the side wall of the sealing column 18 and continues to move. The first pressure plate 16 presses and pushes the sewage above the mud and sand filter screen 15, so that the sludge in the sewage quickly passes through the mud and sand filter screen 15. The second pressure plate 24 presses and pushes the sewage above the mud and water filter screen 20, so that the water in the sewage quickly passes through the mud and water filter screen 20, thus realizing the filtration of mud and sand and the filtration of mud and water in the sewage.

[0046] Then, the second water pump 11 is started. The second water pump 11 transports the water at the bottom of the screening tank 7 back to the inside of the dilution tank 1 through the return water pipe 12, realizing the recycling of water and reducing the waste of water resources.

[0047] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the present invention can be implemented in other specific forms without departing from the spirit or essential characteristics of the present invention.

Claims

1. A sewage pipe network sediment screening device comprising a dilution tank (1), a screening tank (7), a stirring dilution mechanism, a screening mechanism and a pressurization mechanism, a feed pipe (2) for adding sewage to the inside of the dilution tank (1) is installed on the side wall upper end of the dilution tank (1), characterized in that, The side wall lower end of the dilution tank (1) is provided with a sewage discharge pipe (4) for conveying the diluted sewage to the screening tank (7), the far end of the sewage discharge pipe (4) is installed on the side wall upper end of the screening tank (7), the dilution tank (1), the sewage discharge pipe (4) and the screening tank (7) are communicated with each other, and the sewage discharge pipe (4) is provided with a first water pump (10) for moving the sewage from the dilution tank (1) to the screening tank (7); The stirring and diluting mechanism is arranged in the dilution tank (1) and used for adding water to the sewage and stirring and diluting the sewage, so that the soil in the sewage is dispersed and filtered; The screening mechanism comprises a sand filter screen (15), the sand filter screen (15) is horizontally arranged on the inner wall of the screening tank (7), a sand discharge port (22) for discharging sand is arranged on the side wall of the screening tank (7) at the upper end of the sand filter screen (15), a sludge filter screen (20) is horizontally arranged on the inner wall of the screening tank (7) below the sand filter screen (15), a sludge discharge port (23) for discharging sludge is arranged on the side wall of the screening tank (7) at the upper end of the sludge filter screen (20), the sand discharge port (22) and the sludge discharge port (23) are both provided with sealing doors (8), and a backflow assembly for conveying the screened and filtered water to the inside of the dilution tank (1) is arranged on the side wall of the screening tank (7) below the sludge filter screen (20). The pressing mechanism comprises a reciprocating hydraulic telescopic rod (6), the lower ends of the silt filter screen (15) and the silt water filter screen (20) are provided with support frames (19) which are horizontally installed on the inner wall of the screening tank (7), the upper ends of the support frames (19) are vertically provided with a plurality of blocking columns (18), the silt filter screen (15) and the silt water filter screen (20) are sleeved on the side walls of the corresponding blocking columns (18), the height of the lower blocking column (18) is less than half of the distance between the silt water filter screen (20) and the silt filter screen (15), the height of the upper blocking column (18) is less than half of the distance between the silt filter screen (15) and the top of the screening tank (7), the reciprocating hydraulic telescopic rod (6) is installed on the top of the screening tank (7), the output end of the reciprocating hydraulic telescopic rod (6) is provided with a first pressing plate (16) for pushing the sewage at the upper end of the silt filter screen (15) to move, the side wall of the first pressing plate (16) is in sealed sliding connection with the inner wall of the screening tank (7), the lower end of the first pressing plate (16) is vertically provided with a connecting rod (17), the lower end of the connecting rod (17) is provided with a second pressing plate (24) for pushing the sewage at the upper end of the silt water filter screen (20) to move, the side wall of the second pressing plate (24) is in sealed sliding connection with the inner wall of the screening tank (7), the first pressing plate (16) and the second pressing plate (24) are both provided with perforations (21) for facilitating the sewage to pass through, and the perforations (21) are matched with the blocking columns (18); when the first pressing plate (16), the connecting rod (17) and the second pressing plate (24) move upwards, the perforations (21) are separated from the blocking columns (18), so that the sewage passes through the perforations (21) and enters the silt filter screen (15) and the silt water filter screen (20), when the first pressing plate (16), the connecting rod (17) and the second pressing plate (24) move downwards, the perforations (21) are sleeved on the side walls of the blocking columns (18), and the pressing and filtering are continued.

2. A grit separation device for a sewer network according to claim 1, characterised in that, The stirring and diluting mechanism comprises a motor (3), the side wall of the diluting tank (1) is provided with a water inlet pipe (25) for supplementing water to the inside of the diluting tank (1), the upper end of the diluting tank (1) is provided with the motor (3), the output end of the motor (3) is provided with a rotating shaft (14), the lower end of the rotating shaft (14) is rotatably connected to the center position of the bottom of the diluting tank (1) through the top of the diluting tank (1), and a plurality of stirring rods (13) for stirring and diluting the sewage are horizontally installed on the side wall of the rotating shaft (14) in the diluting tank (1).

3. A grit separation device for a sewer network according to claim 2, characterised in that, The backflow assembly comprises a backwater pipe (12), one end of the backwater pipe (12) is installed on the side wall of the screening tank (7) below the sludge filter screen (20), the other end of the backwater pipe (12) is installed on the upper end of the side wall of the dilution tank (1), the dilution tank (1), the backwater pipe (12) and the screening tank (7) are communicated with each other, and the second water pump (11) for moving water from the screening tank (7) to the dilution tank (1) is installed on the backwater pipe (12).

4. A grit separation device for a sewer network according to claim 1, characterised in that, The first one-way valve (5) allowing only sewage to move from the dilution tank (1) to the screening tank (7) is installed on the blowdown pipe (4) between the first water pump (10) and the screening tank (7).

5. A grit separation device for a sewer network according to claim 3, characterised in that, The second one-way valve (9) allowing only water to move from the screening tank (7) to the dilution tank (1) is installed on the backwater pipe (12) between the second water pump (11) and the dilution tank (1).

6. A grit separation device for a sewer network according to claim 3, characterised in that, The guide inclined plate facilitating water collection to the input end of the backwater pipe (12) is installed on the bottom of the screening tank (7).

7. A grit separation device for a sewer network according to claim 1, characterised in that, The sealing rubber ring is installed on the side wall of the first pressing plate (16) and the second pressing plate (24).

8. A method of using a silt screening device for a sewer network as claimed in any one of claims 3, 5 or 6, characterised in that, The method comprises the following steps: Step one: firstly, sewage is added into the dilution tank (1) through the feed pipe (2), a certain amount of water is added into the dilution tank (1) through the water inlet pipe (25), and then the motor (3) is started, the output end of the motor (3) drives the rotating shaft (14) to rotate, the rotating shaft (14) drives the stirring rod (13) to rotate, and the stirring rod (13) stirs the sewage, so as to dilute the sludge in the sewage; Step two: the first water pump (10) is started, the first water pump (10) transports the diluted sewage in the dilution tank (1) to the inside of the screening tank (7) through the blowdown pipe (4), and then the reciprocating hydraulic telescopic rod (6) is started, the output end of the reciprocating hydraulic telescopic rod (6) drives the first pressing plate (16), the connecting rod (17) and the second pressing plate (24) to move upwards, the first pressing plate (16) and the second pressing plate (24) drive the perforations (21) to move upwards, the perforations (21) are separated from the blocking column (18), so that the sewage passes through the perforations (21) to enter the sand filter screen (15) and the sludge filter screen (20), then the output end of the reciprocating hydraulic telescopic rod (6) drives the first pressing plate (16), the connecting rod (17) and the second pressing plate (24) to move downwards, the first pressing plate (16) and the second pressing plate (24) drive the perforations (21) to move downwards, the perforations (21) are sleeved on the side wall of the blocking column (18), and continue to move, the first pressing plate (16) pressurizes and pushes the sewage above the sand filter screen (15), so that the sludge in the sewage quickly passes through the sand filter screen (15), the second pressing plate (24) pressurizes and pushes the sewage above the sludge filter screen (20), so that the water in the sewage quickly passes through the sludge filter screen (20), and the sand filtration and sludge filtration of the sewage are realized; Step three: the second water pump (11) is started, the second water pump (11) re-transportes the water at the bottom of the screening tank (7) to the inside of the dilution tank (1) through the backwater pipe (12), and realizes the recycling of water.

Images