A dredging slurry waste screening device

Abstract

The utility model discloses a dredging sludge garbage screening device, including the mud inlet pipe, the drum type filter screen, the vibration type filter screen, the garbage conveyer belt, the slag outlet channel, the mud outlet channel and the slurry sedimentation tank, the mud inlet pipe is connected for the drum type filter screen of primary filtration, and the vibration type filter screen is used for secondary filtration and sets up below the drum type filter screen, and the slag outlet channel sets up in the slag outlet side of drum type filter screen and vibration type filter screen, and the garbage conveyer belt is connected the slag outlet of slag outlet channel, and the mud outlet channel is connected vibration type filter screen and slurry sedimentation tank, the utility model discloses through optimizing the flow guide structure and forms the no -dead -angle flow channel, designs the screen hole aperture, adjusts the screen surface gradation, effectively prevents the equipment blockage, realizes the classification of impurity removal, improves slurry impurity removal efficiency and solves the pollution problem of slurry spatter and overflow.

Description

Technical Field

[0001] This utility model relates to an environmentally friendly dredging device, specifically a dredging mud and garbage screening device. Background Technology

[0002] With numerous rivers and lakes forming a dense network, many waterways face severe environmental challenges such as cyanobacterial blooms, heavy metal contamination, and black and odorous water bodies due to the failure of environmental protection measures to keep pace with rapid economic development. Typical examples include the eutrophication of large lakes like Taihu Lake and Chaohu Lake, whose cyanobacterial crises have caused serious consequences, severely impacting production and daily life. Therefore, it is necessary to continuously strengthen investment in ecological governance and widely implement various comprehensive water environment remediation projects. Among these, sediment, as a key component of the aquatic ecosystem, is a major destination for many pollutants, which migrate and accumulate in it through adsorption and sedimentation. However, pollutants accumulated in sediment are not stable but exist in a dynamic equilibrium. Once environmental conditions (such as temperature, pH, and dissolved oxygen) change or are disturbed by external forces, they are easily released back into the water body—an endogenous release. This not only exacerbates water quality deterioration but may also harm human health through the food chain. Therefore, sediment remediation has become one of the core aspects of aquatic ecosystem restoration.

[0003] Environmentally friendly dredging is currently the mainstream engineering method for treating contaminated sediment. Unlike traditional dredging aimed at navigation, environmentally friendly dredging utilizes technological innovations, such as improved cutterheads, the addition of anti-diffusion covers, and thin-layer cutting, to maximize efficiency while minimizing sediment disturbance and pollutant diffusion, thus avoiding secondary pollution. Environmentally friendly cutter suction dredging is the most widely used due to its high efficiency and environmental friendliness. Large-scale dredging generates massive amounts of high-moisture (>90%) slurry. The primary step in its treatment is the comprehensive removal of various types of garbage, rocks, and other debris mixed in to ensure smooth subsequent pipeline transportation and dewatering processes.

[0004] Under high-pressure dredging and pumping conditions, traditional screening equipment often causes slurry splashing when dealing with high-water-content, high-pressure slurry, polluting the environment and interfering with construction. Especially in urban rivers, landscape lakes, and other water bodies rich in debris, screen clogging occurs frequently, severely restricting project progress. Utility Model Content

[0005] Purpose of the invention: The purpose of this utility model is to provide a dredging mud and waste screening device that combines efficient graded impurity removal with environmental friendliness.

[0006] Technical solution: The dredging sludge and waste screening device of this utility model includes a sludge inlet pipe, a drum-type filter screen, a vibrating filter screen, a waste conveyor belt, a slag discharge channel, a sludge discharge channel, and a sludge sedimentation tank; the sludge inlet pipe is connected to the drum-type filter screen for primary filtration, the vibrating filter screen is used for secondary filtration and is located below the drum-type filter screen, the slag discharge channel is located on the slag discharge side of the drum-type filter screen and the vibrating filter screen, the waste conveyor belt is connected to the slag discharge port of the slag discharge channel, and the sludge discharge channel is connected to the vibrating filter screen and the sludge sedimentation tank.

[0007] Furthermore, the outlet of the slurry inlet pipe is connected to a slurry guide, which is placed inside a drum-type filter screen. The end of the slurry guide away from the outlet is closed, and an elliptical perforation is opened in the middle. By optimizing the flow guiding structure, a dead-angle-free flow channel is formed, making it difficult for fibrous debris to accumulate, and ensuring that the slurry flows vertically and stably down the pipe axis to the drum-type filter screen.

[0008] Furthermore, a sludge hopper is installed between the drum filter screen and the vibrating filter screen. This hopper is used to collect the sludge from the drum filter screen and guide it to the vibrating filter screen.

[0009] Furthermore, an emergency slurry buffer tank is installed directly below the slag discharge side of the drum filter screen, and an overflow port is opened on the side wall of the emergency slurry buffer tank near the slurry settling tank. When the drum filter screen fails, it can be used to buffer a large amount of slurry transported by the slurry inlet pipe and discharge the filtered slurry to the slurry settling tank through the overflow port.

[0010] Furthermore, the drum-type filter screen includes an inclined screen cylinder, a spiral plate installed on the inner wall of the screen cylinder, and an anti-splash structure on the outer side of the screen cylinder. The spiral plate rotates towards the slag discharge side to guide and push the waste into the slag discharge channel. The combination of the screen cylinder and the anti-splash structure can effectively prevent mud and waste particles from splashing outward during the screening process. The thrown mud falls into the vibrating filter screen after being blocked by the anti-splash structure.

[0011] Furthermore, the vibrating filter screen includes a multi-level vibrating screen, in which the screen mesh is evenly and densely covered with mesh openings, the diameter of which decreases from top to bottom. It can effectively remove over 99% of small-diameter debris such as shell fragments, water chestnuts, and clay balls, as well as easily entangled impurities.

[0012] Furthermore, the screen cylinder is evenly and densely covered with multi-sized screen holes, the diameter of which increases along the axial direction of the screen cylinder. This allows for the removal of over 90% of shellfish and other large-diameter waste.

[0013] Furthermore, the anti-splash structure is a shell or baffle that is disposed on the outside of the screen cylinder and forms a protective gap between the shell and the screen cylinder to block mud splashing.

[0014] Furthermore, the screen cylinder is tilted at an angle of 5° to 15° towards the sludge discharge direction. This allows for better conveying of waste such as plastics and fishing nets into the slag discharge channel.

[0015] Working principle: This utility model uses a drum-type filter screen to perform primary screening of large-diameter waste such as fishing nets, plastic bags, and stones in the mud. A vibrating filter screen then performs secondary screening, filtering out small-diameter waste such as shells, water chestnuts, and reed fibers, as well as easily tangled materials. The graded mud flows into a mud sedimentation tank through a mud outlet channel. The screened waste such as fishing nets, plastic bags, stones, shells, water chestnuts, and reed fibers is transported out via a waste conveyor belt through a slag outlet channel. When the drum-type filter screen malfunctions, a large amount of mud is temporarily stored in an emergency mud buffer tank. The buffer tank has an overflow outlet to allow this portion of mud to flow into the mud sedimentation tank.

[0016] Beneficial effects: Compared with the prior art, this utility model has the following significant features: 1. By optimizing the flow guiding structure to form a dead-angle-free flow channel, fibrous debris is not easily accumulated, ensuring that the mud is discharged vertically and stably along the pipeline axis; 2. By designing the screen aperture and adjusting the screen surface gradation, equipment blockage is effectively prevented, graded impurity removal is achieved, and the overall impurity removal efficiency of dredging mud is improved; 3. The device has a reasonable structure and reliable operation, solving the problem of splash pollution under high pressure and high water content mud transportation conditions; 4. The setting of the mud emergency buffer pool effectively solves the problem of mud overflow when the machine fails. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of this utility model;

[0018] Figure 2 This is the front view of this utility model;

[0019] Figure 3 This is a schematic diagram of the structure of the drum filter screen 2 and the mud guide 8 of this utility model;

[0020] Figure 4 This is a schematic diagram of the structure of the mud guide device 8 of this utility model;

[0021] Figure 5 This is a schematic diagram of the structure of the screen cylinder 21 of this utility model;

[0022] Figure 6 This is a schematic diagram of the structure of the vibrating filter screen 3 of this utility model;

[0023] Figure 7 This is a schematic diagram of the structure of the multi-level vibrating screen 31 of this utility model. Detailed Implementation

[0024] The present invention will be further described below with reference to specific embodiments.

[0025] like Figure 1 , Figure 2 As shown, the dredged sludge waste screening device includes a sludge inlet pipe 1, a drum filter screen 2, a vibrating filter screen 3, a waste conveyor belt 4, a slag discharge channel 5, a sludge discharge channel 6, and a sludge sedimentation tank 7. The drum filter screen 2 includes an inclined screen cylinder 21 with an anti-splash structure 23 on the outside. The vibrating filter screen 3 includes multi-level vibrating screens 31. The sludge inlet pipe 1 connects to the drum filter screen 2 for primary filtration, the vibrating filter screen 3 is used for secondary filtration and is located below the drum filter screen 2, the slag discharge channel 5 is located on the slag discharge side of the drum filter screen 2 and the vibrating filter screen 3, the waste conveyor belt 4 connects to the slag discharge port of the slag discharge channel 5, and the sludge discharge channel 6 connects the vibrating filter screen 3 and the sludge sedimentation tank 7. A drive motor drives a drum-type filter screen 2, which separates large-diameter waste such as fishing nets, plastic bags, and stones through a screen cylinder 21 with evenly distributed multi-sized sieve holes. The anti-splash structure 23 and the mud hopper 9 effectively prevent mud and waste particles from splashing outwards during the screening process. A vibrating filter screen 3, driven by a high-frequency vibrating motor, uses a multi-level vibrating stainless steel screen 31 to remove more than 99% of small-diameter waste and easily entangled debris such as shell fragments, water chestnuts, and clay balls. The separated waste falls directly into the slag discharge channel 5 and is then transported out by the waste conveyor belt 4. The separated mud flows into the mud sedimentation tank 7 through the mud discharge channel 6 located below the vibrating filter screen 3. An emergency mud buffer tank 10 is set on the slag discharge side of the drum-type filter screen 2. An overflow port 101 is opened on the side wall of the emergency mud buffer tank 10 near the mud sedimentation tank 7. The filtered mud and the mud overflowing from the overflow port 101 flow into the mud sedimentation tank 7.

[0026] like Figure 3 , Figure 4 As shown, the outlet of the mud inlet pipe 1 is connected to a mud guide 8, which is placed inside the screen cylinder 21. The end of the mud guide 8 away from the outlet is closed, and an elliptical perforated hole 81 is opened in the middle. Specifically, the elliptical perforated hole 81 is set on the pipe wall at a distance of 100-150cm from the port. When the mud is transported to the mud guide 8 through the pipe, the high-pressure fluid is discharged vertically from the elliptical perforated hole 81 in the middle. This design is optimized through fluid dynamics: First, the closed port eliminates end eddies and avoids fiber entanglement; Second, the polished flow channel (Ra≤3.2μm) reduces boundary layer resistance, making the mud flow velocity stable at 2.5-3m / s (Reynolds number>4000, turbulent state); Third, the long axis of the elliptical perforated hole 81 matches the mainstream velocity zone, and the short axis controls the shear rate, forming a dead-angle-free flow channel, making it difficult for fibrous debris to accumulate, which is far superior to the traditional straight pipe structure.

[0027] like Figure 5As shown, the drum-type filter screen 2 has a screen cylinder 21 with evenly distributed multi-sized screen holes 211. The spiral plates 22 on the inner wall of the cylinder and the increasing diameter of the screen holes 211 along the screen cylinder 21 create a gradient screening mechanism. The first-stage screening zone has 10mm screen holes, separating 45% of small and easily entangled debris, such as shells, water chestnuts, and reed fibers. The second-stage screening zone has 20mm screen holes, capturing 25% of medium-sized debris, such as broken bricks and fishing nets. The third-stage screening zone has 30mm screen holes, capturing 20% ​​of medium to large debris, such as stones and large shells. The fourth-stage screening zone has 40mm screen holes, intercepting 10% of large floating debris, such as plastic buckets and branches. The screen cylinder 21 rotates at 12 rpm. Dynamic verification shows that when the centrifugal acceleration is ≤0.5g, the time for debris to slide against the cylinder wall is ≥8 seconds, ensuring thorough screening. When mud impacts the drum-type filter screen 2, a protective gap is formed between the anti-splash structure 23 and the screen cylinder 21 to block mud splashing. The protective gap is ≤2cm, forming a sealed blocking chamber. The anti-splash structure 23 is an annular shell or a flat baffle. The vertical height of the flat baffle is greater than 4 / 5 of the outer diameter of the drum-type filter screen 2. After the splashed mud hits the baffle, it flows into the mud hopper 9 along the baffle. The intercepted waste is discharged into the waste conveyor belt 4 through the slag discharge channel 5.

[0028] like Figure 6 , Figure 7 As shown, the vibrating filter screen 3 is equipped with a multi-layered stainless steel vibrating screen 31 from top to bottom. Each layer of the screen has a uniformly dense mesh 311, with the diameter of the mesh 311 decreasing from top to bottom. The mesh sizes 311 are 30mm, 20mm, 10mm, 3 mesh, 10 mesh, 20 mesh, 40 mesh, and 60 mesh, which can effectively remove more than 99% of small-diameter debris such as shell fragments, water chestnuts, and clay balls, as well as easily entangled impurities. The vibrating motor runs at 900 rpm with an amplitude of 3mm, causing the shells and water chestnuts to jump, and the screening time is ≤3 seconds. The bottom screen mesh pores deform periodically under vibration (deformation ±0.1mm), peeling off the adhered reed fibers and breaking the mud film coating caused by surface tension.

[0029] When the dredging sludge and waste screening device is in use, the sludge inlet pipe 1 is connected to the sludge conveying pipe from the cutter suction dredger via a flange, and the sludge outlet of the sludge inlet pipe 1 is connected to the sludge guide 8. The sludge enters the sludge guide 8 through the sludge inlet pipe 1 and flows vertically and stably down through the elliptical hollow hole 81 to the drum filter screen 2. The drum filter screen 2 rotates under the drive of the drive motor. The anti-splash structure 23 effectively prevents sludge and waste particles from splashing outward during the screening process. The sludge flows out through the screen holes 211 set on the screen cylinder 21 and enters the sludge funnel 9, falling into the vibrating filter screen 3. Large-diameter waste such as fishing nets, plastic bags, and stones remain inside the drum filter screen 2. The screen cylinder 21 is set with an inclination angle of 5° to 10°. Under the combined action of the spiral plates 22 set on the inner wall of the screen cylinder, the waste screened out of the cylinder is pushed out of the screen cylinder 21 and falls into the slag discharge channel 5. The separated slurry flows into the vibrating filter screen 3 through the sludge funnel 9. Under the action of the high-frequency vibration motor, the slurry flows through the stainless steel multi-level vibrating screen 31 set from top to bottom, and finally flows into the sludge sedimentation tank 7 through the sludge discharge channel 6. Small-diameter waste such as shells, water chestnuts, and reed fibers, as well as easily entangled materials, are trapped in the multi-level vibrating screen. On the multi-level vibrating screen 31, a high-frequency vibrating motor drives the screen surface to vibrate at high frequency to prevent clogging (cleaning cycle ≥ 24h). Under the vibration of the high-frequency vibrating motor, the garbage in the stainless steel multi-level vibrating screen 31 is pushed towards the slag discharge channel 5. All the garbage enters the garbage conveyor belt 4 from the slag discharge port of the slag discharge channel 5. The inclination angle of the garbage conveyor belt 4 is 15°~30°, closely attached to the slag discharge port of the slag discharge channel. The garbage processing capacity is 4t / h, which can better and more directly transport the garbage separated by the drum filter screen 2 and the vibrating filter screen 3. An emergency slurry buffer tank 10 is set directly below the slag discharge side of the drum filter screen 2. An overflow port 101 is opened on the side wall of the emergency slurry buffer tank 10 near the slurry sedimentation tank 7 to form an overflow structure. When the drum filter screen 2 malfunctions, a large amount of slurry transported by the slurry inlet pipe 1 flows out and falls into the slag discharge channel 5 on the slag discharge side, and the garbage conveyor belt 4 is shut off in an emergency. At this time, the slurry falls into the emergency slurry buffer tank 10 for storage. Several overflow ports 101 with filter screens are opened on the side wall of the emergency slurry sedimentation tank 10 near the slurry sedimentation tank 7. The large amount of temporarily stored slurry flows into the slurry sedimentation tank 7 after being filtered through the overflow ports 101. Finally, the slurry screened out and the slurry overflowing from the emergency slurry buffer tank 10 both enter the slurry sedimentation tank 7, waiting for the subsequent dewatering process.

Claims

1. A dredging sludge waste screening device, characterized in that: The system includes a sludge inlet pipe (1), a drum filter screen (2), a vibrating filter screen (3), a waste conveyor belt (4), a slag discharge channel (5), a sludge discharge channel (6), and a sludge sedimentation tank (7). The sludge inlet pipe (1) is connected to the drum filter screen (2) for primary filtration. The vibrating filter screen (3) is used for secondary filtration and is located below the drum filter screen (2). The slag discharge channel (5) is located on the slag discharge side of the drum filter screen (2) and the vibrating filter screen (3). The waste conveyor belt (4) is connected to the slag discharge port of the slag discharge channel (5). The sludge discharge channel (6) is connected to the vibrating filter screen (3) and the sludge sedimentation tank (7).

2. The dredging sludge waste screening device according to claim 1, characterized in that: The mud outlet of the mud inlet guide (1) is connected to the mud guide (8), which is placed inside the drum filter screen (2). The mud guide (8) is closed at one end away from the mud outlet and has an elliptical hollow hole (81) in the middle.

3. The dredging sludge waste screening device according to claim 1, characterized in that: A sludge hopper (9) is provided between the drum filter screen (2) and the vibrating filter screen (3).

4. The dredging sludge waste screening device according to claim 1, characterized in that: The drum filter screen (2) is provided with a mud emergency buffer tank (10) on the slag discharge side, and the mud emergency buffer tank (10) has an overflow port (101) on the side wall near the mud sedimentation tank (7).

5. The dredging sludge waste screening device according to claim 1, characterized in that: The drum filter screen (2) includes an inclined screen cylinder (21), a spiral plate (22) set on the inner wall of the screen cylinder (21), and an anti-splash structure (23) on the outer side of the screen cylinder (21).

6. The dredging sludge waste screening device according to claim 1, characterized in that: The vibrating filter screen (3) includes a multi-level vibrating screen (31), on which screens are evenly and densely covered with screen holes (311), and the diameter of the screen holes (311) decreases from top to bottom.

7. The dredging sludge waste screening device according to claim 5, characterized in that: The screen cylinder (21) is uniformly covered with multi-diameter screen holes (211), and the diameter of the screen holes (211) increases along the axial direction of the screen cylinder (21).

8. The dredging sludge waste screening device according to claim 5, characterized in that: The anti-splash structure (23) is a shell or baffle that is disposed on the outside of the screen cylinder (21) and forms a protective gap between the screen cylinder (21) and the screen cylinder (21) to block mud splashing.

9. The dredging sludge waste screening device according to claim 5, characterized in that: The screen cylinder (21) is inclined at an angle of 5°~15° towards the mud discharge direction.

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