A grit removal device for sewage treatment

Abstract

This utility model discloses a grit removal device for sewage treatment, relating to the field of sewage treatment technology. It includes a grit removal cylinder, with a sand collecting and suction assembly fixedly installed on the upper left side of the mounting plate. An adjustable sand pushing assembly is movably connected to the inner wall of the mounting shell. This grit removal device for sewage treatment utilizes the sand collecting and suction assembly to rotate the sewage by rotating a stirring rod. High-density sand particles concentrate at the conical bottom of the grit removal cylinder's inner cavity, i.e., the upper end of the sand pushing piston plate. Subsequently, a water pump sucks in the sand particles deposited at the bottom of the grit removal cylinder through a sand extraction pipe, achieving sand-water separation. Compared to traditional gravity-driven sand removal, the active suction method allows for precise control of the sand discharge volume and is highly practical. Adjusting the height of the sand pushing piston plate by adjusting the sand pushing assembly adapts to fluctuations in sand content in different sewages. This facilitates the sand pushing piston plate pushing the sand particles towards the center to the inlet of the sand extraction pipe, improving the device's sand discharge efficiency.

Description

Technical Field

[0001] This utility model relates to the field of wastewater treatment technology, and in particular to a grit removal device for wastewater treatment. Background Technology

[0002] Wastewater treatment is the process of purifying wastewater to meet the water quality requirements for discharge into a water body or for reuse. Wastewater treatment is widely used in various fields such as construction, agriculture, transportation, energy, petrochemicals, environmental protection, urban landscaping, medical care, and catering. In the wastewater treatment process, sand and gravel need to be removed through a grit removal device.

[0003] Chinese patent document CN221732471U discloses a grit settling device for sewage treatment, which has a grit settling cylinder fixedly connected to the top of a support column, and a separation cylinder fixedly connected to the bottom of the grit settling cylinder. The advantages of this invention are: when sewage grit settling is required, sewage can be discharged from the inlet pipe on one side of the grit settling cylinder, and then the motor is turned on to drive the second gear to rotate. Through threaded transmission, the stirring paddle rotates, and under the shearing force of the stirring paddle, the sand particles are separated and fall into the sand collection hopper. Then, a water pump can be turned on to extract the accumulated sand particles in the sand collection hopper, eliminating the need for rinsing with clean water, thus saving water resources. When the through hole becomes blocked, rotating the sealing plate causes the threaded pipe to rotate inside the threaded cover, allowing the sand extraction head to be disassembled and cleaned, making cleaning the sand extraction head more convenient.

[0004] The existing technology has the following problems:

[0005] Current technology utilizes a drive motor to rotate an agitator, causing the wastewater to spin. Due to the density difference between sand and water, the denser sand particles concentrate in the sand collection hopper under the combined effects of centrifugal force, centripetal force, buoyancy, and fluid drag. However, both sand and wastewater in the collection hopper are discharged through a sand discharge pipe, resulting in poor separation of wastewater and sand. This requires precise manual control and is impractical. Furthermore, discharging sand and water from the same location easily leads to the loss of a large amount of wastewater. Utility Model Content

[0006] This invention provides a grit removal device for wastewater treatment to solve the problems mentioned in the background art.

[0007] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is as follows:

[0008] A grit settling device for sewage treatment includes a grit settling cylinder, an installation shell fixedly installed at the lower end of the grit settling cylinder, an installation plate fixedly installed at the top of the inner wall of the grit settling cylinder, a grit collecting and suction assembly fixedly installed at the upper left part of the installation plate, and an adjustable grit pushing assembly movably connected to the inner wall of the installation shell.

[0009] The sand collection and suction assembly includes a water pump. The bottom of the outer wall of the water pump is fixedly installed to the upper right side of the mounting plate. A sand suction pipe that penetrates the top of the mounting plate is fixedly installed at the input end of the water pump. An installation sleeve is fixedly installed at the lower middle part of the mounting plate. The top of the outer wall of the sand suction pipe is fixedly connected to the inner wall of the installation sleeve.

[0010] The adjusting sand-pushing assembly includes a guide plate. The left and right ends of the guide plate are fixedly installed to the middle of the inner wall of the mounting shell. The left and right sides of the outer side of the guide plate are slidably connected to movable plates. The upper ends of the two movable plates are rotatably connected to rotating plates. The tops of the two rotating plates are rotatably connected to adjusting plates. The upper middle of the adjusting plate is fixedly installed with a support column penetrating the bottom of the sand settling cylinder. The upper end of the support column is fixedly installed with a sand-pushing piston plate. The outer wall of the sand-pushing piston plate is slidably connected to the bottom of the inner wall of the sand settling cylinder. The sand-pushing piston plate is located below the sand-drawing pipe.

[0011] Preferably, a motor is fixedly installed on the upper left side of the mounting plate. The output end of the motor passes through the top of the mounting plate and is fixedly sleeved with a gear. A rotating sleeve is rotatably connected to the outer wall of the mounting sleeve. A gear is fixedly sleeved on the top of the outer wall of the rotating sleeve. The gear meshes with the outer surface of the gear.

[0012] Preferably, a protective shell is fixedly installed at the lower center of the mounting plate, and both gear one and gear two are located inside the protective shell. The top of the outer wall of the rotating sleeve penetrates through the bottom of the protective shell.

[0013] Preferably, the inner wall of the rotating sleeve is movably connected to the outer wall of the sand extraction pipe.

[0014] Preferably, a plurality of stirring rods arranged in a ring are fixedly installed on the bottom of the outer wall of the rotating sleeve.

[0015] Preferably, a bidirectional lead screw is rotatably connected to the bottom of the inner wall of the mounting housing, penetrating the right side of the mounting housing. A second motor is fixedly installed on the bottom right side of the mounting housing. The output end of the second motor is fixedly connected to the right end of the bidirectional lead screw. The inner walls of the bottom of the two movable plates are threadedly connected to the left and right sides of the outer wall of the bidirectional lead screw.

[0016] Preferably, guide posts are fixedly installed at the four corners of the bottom of the inner wall of the mounting shell, and through holes with matching guide posts are opened at the four corners of the upper end of the adjusting plate.

[0017] Preferably, an inlet pipe is fixedly connected to the top position of the left side of the outer wall of the sedimentation tank, and an outlet pipe with a valve is fixedly installed at the bottom position of the rear side of the outer wall of the sedimentation tank. The bottom of the sedimentation tank is a transparent conical structure.

[0018] Compared with the prior art, the present invention has the following beneficial effects:

[0019] 1. This utility model provides a grit removal device for sewage treatment. Through the cooperation of a water pump, a sand suction pipe, a mounting sleeve, a motor, a gear, a rotating sleeve, and a gear, the rotation of a stirring rod causes the sewage to rotate. Due to the different densities of sand and water, under the combined action of centrifugal force, centripetal force, buoyancy, and fluid drag, the denser sand particles concentrate at the conical bottom of the grit removal cylinder, i.e., the upper end of the sand-pushing piston plate. Subsequently, the water pump sucks in the sand particles deposited at the bottom of the grit removal cylinder through the sand suction pipe, achieving sand-water separation. Compared with traditional gravity sand discharge, the active suction method can precisely control the amount of sand discharged, making it highly practical.

[0020] 2. This utility model provides a grit removal device for sewage treatment. Through the cooperation of a protective shell, stirring rod, guide plate, moving plate, rotating plate, adjusting plate, support column, sand-pushing piston plate, bidirectional lead screw, motor, and guide column, the height of the sand-pushing piston plate can be adjusted to adapt to fluctuations in the sand content of different sewage. This facilitates the sand-pushing piston plate in pushing sand particles towards the center to the inlet of the sand suction pipe, improving the sand discharge efficiency of the device. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the overall front structure of this utility model;

[0022] Figure 2 This is a top view of the overall structure of this utility model;

[0023] Figure 3 This is a schematic cross-sectional view of the overall structure of this utility model;

[0024] Figure 4 This is a schematic diagram of the adjustable sand-pushing assembly structure of this utility model;

[0025] Figure 5 This is a schematic diagram of the sand collection and suction component of this utility model;

[0026] Figure 6 This is a partially enlarged schematic diagram of point A of this utility model.

[0027] In the diagram: 1. Sand settling cylinder; 2. Sand collecting and suction assembly; 3. Adjustable sand pushing assembly; 4. Mounting shell; 5. Mounting plate; 6. Water inlet pipe; 7. Water outlet pipe; 21. Water pump; 22. Sand suction pipe; 23. Mounting sleeve; 24. Motor 1; 25. Gear 1; 26. Rotating sleeve; 27. Gear 2; 28. Protective shell; 29. ​​Stirring rod; 31. Guide plate; 32. Moving plate; 33. Rotating plate; 34. Adjusting plate; 35. Support column; 36. Sand pushing piston plate; 37. Two-way lead screw; 38. Motor 2; 39. Guide column. Detailed Implementation

[0028] To make the technical means, creative features, objectives and effects of this utility model easier to understand, the present utility model will be further described below in conjunction with specific embodiments.

[0029] like Figures 1-6 As shown, a grit settling device for sewage treatment includes a grit settling cylinder 1, an installation shell 4 fixedly installed at the lower end of the grit settling cylinder 1, an installation plate 5 fixedly installed at the top of the inner wall of the grit settling cylinder 1, a grit collecting and suction assembly 2 fixedly installed at the upper left part of the installation plate 5, and an adjustable grit pushing assembly 3 movably connected to the inner wall of the installation shell 4.

[0030] The sand collection and suction assembly 2 includes a water pump 21. The bottom of the outer wall of the water pump 21 is fixedly installed on the upper right side of the mounting plate 5. A sand suction pipe 22 that penetrates the top of the mounting plate 5 is fixedly installed at the input end of the water pump 21. An mounting sleeve 23 is fixedly installed at the lower middle part of the mounting plate 5. The top of the outer wall of the sand suction pipe 22 is fixedly connected to the inner wall of the mounting sleeve 23.

[0031] The adjusting sand pushing assembly 3 includes a guide plate 31. The left and right ends of the guide plate 31 are fixedly installed in the middle of the inner wall of the mounting shell 4. The left and right sides of the outer side of the guide plate 31 are slidably connected to the moving plates 32. The upper ends of the two moving plates 32 are rotatably connected to the rotating plates 33. The top of the two rotating plates 33 is rotatably connected to the adjusting plate 34. The upper middle of the adjusting plate 34 is fixedly installed with a support column 35 that penetrates the bottom of the sand settling cylinder 1. The upper end of the support column 35 is fixedly installed with a sand pushing piston plate 36. The outer wall of the sand pushing piston plate 36 is slidably connected to the bottom of the inner wall of the sand settling cylinder 1. The sand pushing piston plate 36 is located below the sand extraction pipe 22.

[0032] The sand collection and suction assembly 2 utilizes the rotation of the stirring rod 29 to cause the wastewater to rotate. Due to the different densities of sand and water, under the combined action of centrifugal force, centripetal force, buoyancy, and fluid drag, the denser sand particles concentrate at the conical bottom of the inner cavity of the sand settling cylinder 1, i.e., the upper end of the sand-pushing piston plate 36. Subsequently, the water pump 21 sucks in the sand particles deposited at the bottom of the sand settling cylinder 1 through the sand suction pipe 22, achieving sand-water separation. Compared with traditional gravity sand discharge, the active suction method can precisely control the amount of sand discharged, making it highly practical. By adjusting the height of the sand-pushing piston plate 36, the height of the sand-pushing assembly 3 can be adjusted to adapt to fluctuations in the sand content of different wastewater. This facilitates the sand-pushing piston plate 36 pushing the sand particles towards the center to the inlet of the sand suction pipe 22, improving the sand discharge efficiency of the device.

[0033] like Figure 6 As shown, a motor 24 is fixedly installed on the upper left side of the mounting plate 5. The output end of the motor 24 passes through the top of the mounting plate 5 and is fixedly sleeved with a gear 25. A rotating sleeve 26 is rotatably connected to the outer wall of the mounting sleeve 23. A gear 27 is fixedly sleeved on the top of the outer wall of the rotating sleeve 26. The gear 27 meshes with the outer surface of the gear 25.

[0034] The output of motor 24 meshes with gear 27 via gear 25, driving the rotating sleeve 26 to rotate. The rotating sleeve 26 is fitted around the sand extraction pipe 22, realizing the transmission logic of "sand extraction pipe 22 fixed, rotating sleeve 26 rotating". The rotating sleeve 26 drives the stirring rod 29 to rotate, providing a power source for the centrifugal separation of sediment.

[0035] like Figure 6 As shown, a protective shell 28 is fixedly installed at the lower center of the mounting plate 5. Gear 1 25 and gear 27 are both located inside the protective shell 28. The top of the outer wall of the rotating sleeve 26 penetrates the bottom of the protective shell 28.

[0036] The protective shell 28 prevents sewage from entering the gear transmission mechanism and avoids corrosion or jamming of mechanical parts.

[0037] like Figure 6 As shown, the inner wall of the rotating sleeve 26 is movably connected to the outer wall of the sand extraction pipe 22.

[0038] like Figure 5 As shown, several stirring rods 29 arranged in a ring are fixedly installed on the bottom of the outer wall of the rotating sleeve 26.

[0039] The rotating stirring rod 29 pushes the sewage to form a vortex, and the centrifugal force causes the sand particles to gather at a high density towards the bottom of the conical sedimentation cylinder 1, while the water flows towards the center at a low density, laying the foundation for subsequent sand-water separation.

[0040] like Figure 4 As shown, a bidirectional lead screw 37 is rotatably connected to the bottom of the inner wall of the mounting shell 4, passing through the right side of the mounting shell 4. A second motor 38 is fixedly installed on the bottom right side of the mounting shell 4. The output end of the second motor 38 is fixedly connected to the right end of the bidirectional lead screw 37. The inner walls of the bottom of the two moving plates 32 are threadedly connected to the left and right sides of the outer wall of the bidirectional lead screw 37.

[0041] The output of motor 38 drives the bidirectional lead screw 37 to rotate, which in turn drives the left and right moving plates 32 to move closer or further away synchronously. The two moving plates 32, via the rotating plate 33, push the adjusting plate 34 up and down, thereby adjusting the height of the sand-pushing piston plate 36. This allows it to adapt to fluctuations in sand content in different wastewaters. The sand-pushing piston plate 36 can push sand particles towards the center to the inlet of the sand-draining pipe 22, improving the sand discharge efficiency of the device.

[0042] like Figure 4 As shown, guide posts 39 are fixedly installed at the four corners of the bottom of the inner wall of the mounting shell 4, and through holes with matching guide posts 39 are opened at the four corners of the upper end of the adjusting plate 34.

[0043] The guide post 39 guides the lifting and lowering of the adjusting plate 34.

[0044] like Figure 2As shown, an inlet pipe 6 is fixedly connected to the top left side of the outer wall of the sedimentation tank 1, and an outlet pipe 7 with a valve is fixedly installed at the bottom rear side of the outer wall of the sedimentation tank 1. The bottom of the sedimentation tank 1 is a transparent conical structure.

[0045] Water inlet pipe 6: Top water inlet reduces disturbance to the bottom sediment, ensuring stable sand settling. Water outlet pipe 7: Bottom outlet facilitates the discharge of separated clean water; valve controls flow rate. Transparent conical bottom: Facilitates observation of sand deposition, real-time monitoring of device operation, and optimization of sand discharge timing.

[0046] The working principle of this invention is as follows: This device achieves efficient sand-water separation through a combination of centrifugal sedimentation and mechanically assisted sand removal. Wastewater flows into the upper part of the sedimentation cylinder 1 from the inlet pipe 6. Because the inlet is located at a high position, the water flow causes minimal disturbance to the bottom, and large sand particles begin to settle naturally to the conical bottom. The output end of motor 24 meshes with gear 27 via gear 25, driving the rotating sleeve 26 to rotate. The rotating sleeve 26 drives the stirring rod 29 to rotate, providing power for the centrifugal separation of sand. Due to the different densities of sand and water, under the combined action of centrifugal force, centripetal force, buoyancy, and fluid drag, the denser sand particles concentrate at the conical bottom of the sedimentation cylinder 1, i.e., the upper end of the sand-pushing piston plate 36. The height adjustment of the sand-pushing piston plate 36, in conjunction with the water pump 21, enables continuous sand extraction and prevents blockage of the sand extraction pipe 22.

[0047] Pump 21 draws in sand particles deposited at the bottom of the sand settling cylinder 1 through the sand suction pipe 22, achieving sand-water separation. When the sand content of the sewage is high, the sand deposition thickness increases. The sand-pushing piston plate 36 can be adjusted to a higher position (i.e., moved upwards) to shorten the distance to the deposited sand layer, preventing the inlet of the sand suction pipe 22 from being buried or insufficient suction due to an excessively thick sand layer. Starting motor 38 causes its output to drive the bidirectional lead screw 37 to rotate. The bidirectional lead screw 37 drives the left and right moving plates 32 to move closer or further away synchronously. The two moving plates 32 push the adjusting plate 34 up and down via the rotating plate 33, thereby adjusting the height of the sand-pushing piston plate 36. This allows it to adapt to fluctuations in sand content in different sewages. The sand-pushing piston plate 36 can push the sand particles towards the center to the inlet of the sand suction pipe 22, improving the sand discharge efficiency of the device.

[0048] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claims. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A grit settling device for wastewater treatment, comprising a grit settling cylinder (1), characterized in that: The lower end of the sedimentation cylinder (1) is fixedly installed with an installation shell (4), the top of the inner wall of the sedimentation cylinder (1) is fixedly installed with an installation plate (5), the upper left side of the installation plate (5) is fixedly installed with a sand collecting and suction assembly (2), and the inner wall of the installation shell (4) is movably connected to an adjustable sand pushing assembly (3). The sand collection and suction assembly (2) includes a water pump (21). The bottom of the outer wall of the water pump (21) is fixedly installed on the upper right side of the mounting plate (5). A sand suction pipe (22) penetrating the top of the mounting plate (5) is fixedly installed at the input end of the water pump (21). An installation sleeve (23) is fixedly installed at the lower middle part of the mounting plate (5). The top of the outer wall of the sand suction pipe (22) is fixedly connected to the inner wall of the installation sleeve (23). The adjusting sand pushing assembly (3) includes a guide plate (31). The left and right ends of the guide plate (31) are fixedly installed in the middle of the inner wall of the mounting shell (4). The left and right sides of the guide plate (31) are slidably connected to moving plates (32). The upper ends of the two moving plates (32) are rotatably connected to rotating plates (33). The tops of the two rotating plates (33) are rotatably connected to adjusting plates (34). The middle of the upper end of the adjusting plate (34) is fixedly installed with a support column (35) that penetrates the bottom of the sand settling cylinder (1). The upper end of the support column (35) is fixedly installed with a sand pushing piston plate (36). The outer wall of the sand pushing piston plate (36) is slidably connected to the bottom of the inner wall of the sand settling cylinder (1). The sand pushing piston plate (36) is located below the sand extraction pipe (22).

2. A grit removal device for wastewater treatment according to claim 1, characterized in that: A motor (24) is fixedly installed on the upper left side of the mounting plate (5). The output end of the motor (24) passes through the top of the mounting plate (5) and is fixedly sleeved with a gear (25). A rotating sleeve (26) is rotatably connected to the outer wall of the mounting sleeve (23). A gear (27) is fixedly sleeved on the top of the outer wall of the rotating sleeve (26). The gear (27) meshes with the outer surface of the gear (25).

3. A grit removal device for wastewater treatment according to claim 2, characterized in that: A protective shell (28) is fixedly installed at the lower middle part of the mounting plate (5). The first gear (25) and the second gear (27) are both located inside the protective shell (28). The top of the outer wall of the rotating sleeve (26) penetrates the bottom of the protective shell (28).

4. A grit removal device for wastewater treatment according to claim 3, characterized in that: The inner wall of the rotating sleeve (26) is movably connected to the outer wall of the sand extraction pipe (22).

5. A grit removal device for wastewater treatment according to claim 4, characterized in that: Several stirring rods (29) arranged in a ring are fixedly installed on the bottom of the outer wall of the rotating sleeve (26).

6. A grit removal device for wastewater treatment according to claim 1, characterized in that: The bottom of the inner wall of the mounting shell (4) is rotatably connected to a bidirectional lead screw (37) that passes through the right side of the mounting shell (4). A second motor (38) is fixedly installed on the bottom right side of the mounting shell (4). The output end of the second motor (38) is fixedly connected to the right end of the bidirectional lead screw (37). The inner walls of the bottom of the two moving plates (32) are threadedly connected to the left and right sides of the outer wall of the bidirectional lead screw (37).

7. A grit removal device for wastewater treatment according to claim 1, characterized in that: Guide posts (39) are fixedly installed at the four corners of the bottom of the inner wall of the mounting shell (4), and through holes with matching guide posts (39) are opened at the four corners of the upper end of the adjustment plate (34).

8. A grit removal device for wastewater treatment according to claim 1, characterized in that: A water inlet pipe (6) is fixedly connected to the top of the left side of the outer wall of the sedimentation cylinder (1), and a water outlet pipe (7) with a valve is fixedly installed at the bottom of the rear side of the outer wall of the sedimentation cylinder (1). The bottom of the sedimentation cylinder (1) is a transparent conical structure.

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