A sludge pre-deposition device for environmental dredging

Abstract

The application discloses an environment-friendly sludge pre-precipitation device for dredging, and belongs to the technical field of environment-friendly dredging, which comprises a sand settling basin, and further comprises: a water inlet pipe and a water outlet pipe; a supporting plate, a rotating shaft is rotatably arranged on the supporting plate through a bearing, a plurality of height-adjustable impellers are arranged on the rotating shaft; a fixing mechanism for limiting and fixing the impellers adjusted to different heights; in the scheme, the sludge sewage flows into the sand settling basin from the tangent direction of the inner wall of the sand settling basin, and a cyclone is formed along the inner wall; the driving mechanism drives the rotating shaft and the impeller to rotate, so that the sludge sewage flows spirally, the separation of organic matters and sand particles is promoted, the separation efficiency is accelerated, and the subsequent processing period is reduced; the fixing of the impeller by the fixing mechanism is released, then the impeller can be driven to move up and down to adjust the position, the position of the impeller can be adjusted according to the different sand settling treatment requirements of the sand settling basin, and the separation effect of the sand particles from the organic matters and water is better.

Description

Technical Field

[0001] This invention belongs to the field of environmental dredging technology, and more specifically, relates to a sludge pre-sedimentation device for environmental dredging. Background Technology

[0002] Environmental dredging is a solution for treating river pollution. It aims to remove polluted sediment from rivers and lakes, reduce the release of endogenous pollutants, lower water pollution levels, and combine environmental dredging with ecological restoration. This approach combines the characteristics of environmental dredging with the creation of conditions for the restoration of aquatic ecosystems, thereby improving the water environment of shallow rivers and lakes. The advantage of underwater environmental dredging lies in its targeted approach, enabling it to quickly reduce pollutants.

[0003] Currently, environmental dredging equipment is relatively crude. During construction, the equipment disturbs the bottom sediment and extracts the sludge from the bottom of the water. The sludge that comes ashore has a high water content. Generally, the sludge is pumped into a sedimentation tank for long-term static sedimentation before being introduced into equalization tanks and equalization tanks for further treatment. However, the sedimentation of sludge takes a long time, which will prolong the subsequent treatment period. Moreover, the inability to settle quickly will increase the burden on subsequent wastewater treatment.

[0004] Currently, vortex grit chambers are also used for pretreatment of sludge. The denser sand particles are thrown against the chamber walls and sink to the bottom under gravity, while lighter organic matter separates from the sand and is carried out of the chamber by the swirling effluent. However, the impeller position in this equipment is fixed and cannot be adjusted according to different grit treatment needs, resulting in poor flexibility, limited application, and an inability to achieve optimal treatment results.

[0005] Therefore, it is necessary to provide an environmentally friendly dredging sludge pre-sedimentation device to solve the above-mentioned technical problems. Summary of the Invention

[0006] The purpose of this invention is to provide an environmentally friendly dredging sludge pre-sedimentation device to solve the above-mentioned technical problems.

[0007] To achieve the above objectives, the present invention adopts the following technical solution:

[0008] An environmentally friendly dredging sludge pre-sedimentation device includes a sedimentation tank and further includes:

[0009] Both the inlet pipe and the outlet pipe are located on the sedimentation tank and are connected to its interior;

[0010] A support plate is provided at the top of the sedimentation tank. A rotating shaft is rotatably mounted on the support plate via a bearing. Multiple height-adjustable impellers are mounted on the rotating shaft.

[0011] A drive mechanism, mounted on the support plate, is used to drive the rotating shaft to rotate;

[0012] A fixing mechanism, located on the rotating shaft, is used to restrict and fix the impeller when it is adjusted to different heights.

[0013] Furthermore, a collar is slidably sleeved on the outer wall of the rotating shaft, and multiple impellers are evenly arranged on the collar. Multiple fixing holes are opened on the inner wall of the collar.

[0014] Furthermore, the rotating shaft has a transmission cavity inside, and the fixing mechanism includes:

[0015] A telescopic component is provided on the inner wall of the transmission cavity, and a movable rod is provided at the telescopic end of the telescopic component;

[0016] Multiple block groups are evenly distributed at different heights on the rotating shaft. Each block group includes multiple fixed blocks that move through the outer wall of the rotating shaft and are adapted to the fixing holes.

[0017] Multiple connecting rods, one end of which is hinged to each of the fixed blocks, and the other end of which is hinged to the rotating shaft.

[0018] Furthermore, the driving mechanism includes a first driving member disposed on the support plate, the output end of the first driving member is provided with a gear, and the outer wall of the rotating shaft is provided with a gear ring that meshes with the gear.

[0019] Furthermore, the outer wall of the collar is provided with a plurality of mounting blocks, each mounting block having a slot and a through hole. The impeller is provided with an insert plate that matches the slot, and the insert plate has a mounting hole that matches the through hole.

[0020] Furthermore, it also includes a top plate disposed at the end of the rotating shaft, the rotating shaft having a through cavity, the top plate having a through hole communicating with the through cavity, and the top plate being provided with a lifting component for driving the collar to move up and down.

[0021] Furthermore, the lifting component includes two support plates on the top plate, a rotating rod rotatably arranged between the two support plates, a second driving member connected to the rotating rod on the support plate, a rope winding wheel on the outer wall of the rotating rod, a first traction rope wound on the rope winding wheel, a plurality of second traction ropes on the movable end of the first traction rope, and the other end of the second traction ropes connected to the collar.

[0022] Furthermore, the outer wall of the rotating shaft is provided with multiple brackets, and a steering wheel is rotatably mounted on the bracket for steering the second traction rope.

[0023] Furthermore, a grid mesh is installed inside the water outlet pipe, and an installation port is opened at the position corresponding to the grid mesh in the water outlet pipe. A cover plate is hinged to the installation port, and a limiting component for restricting the grid mesh is provided inside the installation port.

[0024] Furthermore, the limiting component includes:

[0025] An indentation is formed in the side wall of the mounting port, and a limiting block is slidably provided in the indentation;

[0026] The elastic element has one end connected to the limiting block and the other end connected to the inner wall of the recessed groove.

[0027] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0028] 1. In this solution, the sludge wastewater flows tangentially into the inner wall of the grit chamber, forming a swirling flow along its inner wall. Sand particles are thrown against the chamber wall and sink to the bottom under gravity. Lighter organic matter separates from the sand and is discharged from the outlet pipe with the water flow, achieving a pretreatment effect of solid-liquid separation in the sludge. At the same time, the drive mechanism drives the rotating shaft and impeller to rotate, which makes the sludge flow in a spiral shape, increasing the swirling effect in the grit chamber. This allows for better separation of relatively denser sand particles from organic matter and water, accelerating the separation efficiency, reducing the treatment period, and lowering the cost and time risk of subsequent sludge dewatering treatment.

[0029] 2. This solution removes the fixing mechanism from the impeller, allowing it to move up and down along the shaft to adjust its height. After adjustment, the impeller is fixed back in place by the fixing mechanism. This allows for flexible adjustment of the impeller's position according to the different sedimentation treatment needs of the sedimentation tank, making it highly adaptable and unrestricted in use. This results in optimal separation of organic matter and sand, significantly increasing the swirling effect in the sedimentation tank and improving the separation of sand from organic matter and water.

[0030] 3. This solution allows for the disassembly and installation of the impeller, avoiding the current practice where impellers are fixed to the shaft. This facilitates subsequent impeller inspection and replacement without the need for forceful cutting, disassembly, or welding, saving time and effort while minimizing damage to the shaft and impeller. Furthermore, different impeller specifications can be used to meet various needs, allowing for adjustments based on different situations and processing requirements, making it highly practical.

[0031] 4. In this solution, after the fixing mechanism is released from the impeller, the position of the collar can be adjusted by moving it up and down through the lifting component. This eliminates the need for manual operation or the use of other tools, saving a significant amount of labor and time, and resulting in high work efficiency. Furthermore, when the impeller needs to be inspected or replaced, it can be raised to its highest position through the lifting component. At this point, the staff can operate it from the top of the sedimentation tank without having to enter the interior of the sedimentation tank, saving time and effort and increasing work efficiency.

[0032] 5. In this design, floating debris such as leaves on the water flow will be blocked by the grating in the outlet pipe, preventing them from flowing out with the water. This filtration of floating debris improves the subsequent water treatment effect and enhances the practicality of the device. After a period of use, the grating can be removed from the outlet pipe for cleaning or replacement, making the process convenient, quick, time-saving, and labor-saving, thus improving performance. Attached Figure Description

[0033] Figure 1 This is a schematic diagram of the external structure of the sedimentation tank of the present invention;

[0034] Figure 2 This is a schematic diagram of the internal structure of the sedimentation tank of the present invention;

[0035] Figure 3 for Figure 2 Enlarged structural diagram at point A in the middle;

[0036] Figure 4 for Figure 2 Enlarged structural diagram at point B;

[0037] Figure 5 for Figure 2 Enlarged structural diagram at point C;

[0038] Figure 6 This is an exploded view of the components on the impeller and collar of the present invention;

[0039] Figure 7 This is a partial cross-sectional view of the rotating shaft of the present invention;

[0040] Figure 8 for Figure 7 Enlarged structural diagram at point D;

[0041] Figure 9 for Figure 7 Enlarged structural diagram at point E;

[0042] Figure 10 This is a schematic diagram of the cover plate of the water outlet pipe of the present invention in the open state;

[0043] Explanation of the labels in the diagram:

[0044] 1. Sedimentation tank; 2. Inlet pipe; 3. Outlet pipe; 4. Support plate; 5. Rotating shaft; 6. Impeller; 7. Drive mechanism; 71. First drive component; 72. Gear; 73. Gear ring; 8. Fixing mechanism; 81. Telescopic component; 82. Moving rod; 83. Fixing block; 84. Connecting rod; 9. Collar; 10. Fixing hole; 11. Transmission cavity; 12. Mounting sleeve; 13. Slot; 14. Through hole; 15. Insert plate; 16. Mounting hole; 17. Top plate; 18. Through cavity; 19. Through hole; 20. Lifting component; 201. Support plate; 202. Rotating rod; 203. Second driving component; 204. Rope wheel; 205. First traction rope; 206. Second traction rope; 21. Bracket; 22. Steering wheel; 23. Grid mesh; 24. Mounting port; 25. Cover plate; 26. Restriction component; 261. Inner groove; 262. Restriction block; 263. Elastic element; 27. Stop block. Detailed Implementation

[0045] 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.

[0046] Please see Figure 1-4 and Figure 6-7 An environmentally friendly dredging sludge pre-sedimentation device includes a sedimentation tank 1, and further includes: an inlet pipe 2 and an outlet pipe 3, both installed on the sedimentation tank 1 and communicating with its interior; a support plate 4, installed on the top of the sedimentation tank 1, with a rotating shaft 5 rotatably mounted on the support plate 4 via bearings, and multiple height-adjustable impellers 6 mounted on the rotating shaft 5; a drive mechanism 7, installed on the support plate 4, for driving the rotating shaft 5 to rotate; and a fixing mechanism 8, installed on the rotating shaft 5, for restricting and fixing the impellers 6 adjusted to different heights.

[0047] In operation, the sludge wastewater is introduced into the grit chamber 1 through the inlet pipe 2. The wastewater flows tangentially into the inner wall of the grit chamber 1. Utilizing a portion of the pump's hydraulic pressure, the grit chamber 1 creates a swirling flow along its inner wall, throwing sand particles against the wall and causing them to sink to the bottom under gravity. Lighter organic matter separates from the sand and is discharged with the water flow through the outlet pipe 3, achieving solid-liquid separation in the sludge, thus pre-treating it. Simultaneously, the drive mechanism 7 rotates the shaft 5, which in turn rotates the impeller 6. The impeller 6 causes the sludge wastewater to flow in a spiral pattern, further promoting the separation of organic matter and sand particles and enhancing the swirling effect in the grit chamber 1. This allows for better separation of denser sand particles from organic matter and water. Therefore, this swirling separation pre-treatment of the sludge wastewater accelerates sand separation efficiency, reduces subsequent treatment time, and lowers the cost and time risks of subsequent sludge dewatering treatment, resulting in good performance.

[0048] The impeller 6 can be fixed by the fixing mechanism 8, and then the impeller 6 can be moved up and down along the rotating shaft 5 to adjust its height position on the rotating shaft 5. After adjustment, the impeller 6 can be fixed by the fixing mechanism 8 again. Thus, the impeller 6 in the grit chamber 1 is adjustable and its position can be adjusted according to the different grit treatment needs of the grit chamber 1. It is highly flexible and the use of the impeller 6 is not limited, thereby achieving the best separation effect between organic matter and sand particles, greatly increasing the swirling effect in the grit chamber 1, and making the separation effect of sand particles, organic matter and water better.

[0049] In this embodiment, preferably, please refer to [reference needed]. Figure 2-4 and Figure 6-8 A collar 9 is slidably fitted onto the outer wall of the rotating shaft 5, and multiple impellers 6 are evenly distributed on the collar 9. Multiple fixing holes 10 are opened on the inner wall of the collar 9. The impellers 6 are mounted on the collar 9, and the collar 9 will drive the multiple impellers 6 to slide up and down along the rotating shaft 5 to adjust their positions.

[0050] In this embodiment, preferably, please refer to [reference needed]. Figure 4 and Figure 6-8 The rotating shaft 5 has a transmission cavity 11 inside. The fixing mechanism 8 includes: a telescopic member 81, which is located on the inner wall of the transmission cavity 11. The telescopic end of the telescopic member 81 is provided with a moving rod 82. The telescopic member 81 in this application is an electric telescopic rod; multiple block groups, which are evenly distributed at different heights on the rotating shaft 5. Each block group includes multiple fixed blocks 83 that move through the outer wall of the rotating shaft 5 and are adapted to the fixing holes 10; and multiple connecting rods 84, one end of which is hinged to each fixed block 83 and the other end of which is hinged to the rotating shaft 5.

[0051] The telescopic component 81 drives the moving rod 82 to retract, so as to Figure 6For example, when the moving rod 82 moves upward, it will simultaneously engage with multiple connecting rods 84, causing multiple fixing blocks 83 to move horizontally synchronously. Ultimately, the fixing blocks 83 will disengage from the fixing holes 10 of the collar 9. Once the collar 9 is no longer restricted by the fixing blocks 83, it can slide up and down along the outer wall of the rotating shaft 5. This allows for adjustment of the height of the collar 9 and the impeller 6, providing high flexibility and allowing for adjustment as needed. After adjustment, the collar 9 is positioned at the adjusted location of the fixing blocks 83. Then, the moving rod 82 is extended via the telescopic component 81, causing it to move downward. This downward movement of the moving rod 82 will simultaneously engage with multiple connecting rods 84, causing multiple fixing blocks 83 to move horizontally synchronously. The fixing blocks 83 will then move outward from the rotating shaft 5, and the fixing blocks 83 at the collar 9 will eventually enter the fixing holes 10 of the collar 9, thus restricting and fixing the collar 9 and the impeller 6, ensuring the subsequent performance of the impeller 6.

[0052] The force exerted by the moving rod 82 and the connecting rod 84 on the fixed block 83 in the horizontal direction is greater than the force exerted on the fixed block 83 in other directions, so as to ensure that the fixed block 83 can move smoothly in the horizontal direction, and the fixed block 83 only needs to move a small distance.

[0053] In this embodiment, preferably, please refer to [reference needed]. Figure 2-3 The drive mechanism 7 includes a first drive member 71 mounted on the support plate 4. A gear 72 is mounted on the output end of the first drive member 71, and a gear ring 73 meshing with the gear 72 is mounted on the outer wall of the rotating shaft 5. In this application, the first drive member 71 is a servo motor. The first drive member 71 drives the gear 72 to rotate, which in turn drives the gear ring 73 and the rotating shaft 5 to rotate, thus causing the impeller 6 to rotate and resulting in a spiral flow of the sewage slurry.

[0054] In this embodiment, preferably, please refer to [reference needed]. Figure 4 and Figure 6-7The outer wall of the collar 9 is provided with multiple mounting blocks 12. Each mounting block 12 has a slot 13 and a through hole 14. The impeller 6 has an insert plate 15 that matches the slot 13, and the insert plate 15 has a mounting hole 16 that matches the through hole 14. By inserting the insert plate 15 on the impeller 6 into the through hole 14 of the mounting block 12, and then inserting bolts into the through hole 14 and mounting hole 16 respectively, and finally securing them with nuts, the insert plate 15 and the impeller 6 can be fixed to the mounting block 12, thus achieving the installation of the impeller 6. Disassembly of the impeller 6 is similar, simple to operate, and allows for easy disassembly and installation, avoiding the current practice of fixing the impeller 6 to the shaft 5. This facilitates subsequent maintenance and replacement of the impeller 6 without the need for forceful cutting, disassembly, or welding, saving time and effort while reducing damage to the shaft 5 and the impeller 6. At the same time, different specifications of impellers can be replaced according to different needs, so that adjustments can be made for different occasions and processing requirements, making it highly practical.

[0055] In this embodiment, preferably, please refer to [reference needed]. Figure 1-4 and Figure 6-7 It also includes a top plate 17 located at the end of the rotating shaft 5. A through cavity 18 is provided inside the rotating shaft 5, and a through hole 19 communicating with the through cavity 18 is provided on the top plate 17. A lifting component 20 for driving the collar 9 to move up and down is provided on the top plate 17. When the fixing mechanism 8 is released from fixing the impeller 6, the collar 9 can be moved up and down by the lifting component 20, thereby moving the impeller 6 up and down to adjust its position. This allows for convenient adjustment of the impeller 6 without the need for manual operation or the use of other tools. Because the impeller 6 is relatively heavy, this greatly facilitates operation, saving a significant amount of labor and time, and increasing work efficiency. When adjusting the position of the impeller 6, it can be adjusted up and down by the lifting component 20, making the operation simple and convenient. Furthermore, when it is necessary to inspect or replace the impeller 6, the lifting component 20 can be used to raise the impeller 6 to the highest position. At this time, the staff can operate it from the top of the sedimentation tank 1 without having to enter the interior of the sedimentation tank 1. This avoids the difficulties of entry and exit and operation, saving time and effort and increasing work efficiency.

[0056] In this embodiment, preferably, please refer to [reference needed]. Figure 3-4 and Figure 6-7The lifting component 20 includes two support plates 201 mounted on the top plate 17. A rotating rod 202 is rotatably mounted between the two support plates 201. A second driving component 203 is mounted on the support plate 201 and is connected to the rotating rod 202. The second driving component 203 in this application is a servo motor. A rope winding wheel 204 is mounted on the outer wall of the rotating rod 202. A first traction rope 205 is wound on the rope winding wheel 204. A plurality of second traction ropes 206 are mounted on the movable end of the first traction rope 205. The other end of the second traction rope 206 is connected to the collar 9. The second driving component 203 drives the rotating rod 202 and the rope wheel 204 to rotate. As the rope wheel 204 rotates, it tightens or loosens the first traction rope 205. When it drives the collar 9 and impeller 6 to rise, the rope wheel 204 tightens the first traction rope 205, which in turn pulls the second traction rope 206. The second traction rope 206 then drives the collar 9 and impeller 6 to rise along the rotating shaft 5. When the rope wheel 204 loosens the first traction rope 205, the collar 9 and impeller 6 will move downwards due to gravity, thus realizing the up-and-down movement of the collar 9 and impeller 6.

[0057] In this embodiment, preferably, please refer to [reference needed]. Figure 7 and Figure 9 The outer wall of the rotating shaft 5 is provided with multiple brackets 21, and a steering wheel 22 is rotatably mounted on the bracket 21 for steering the second traction rope 206. The steering wheel 22 allows the second traction rope 206 to slide along the steering wheel 22, which can reduce the friction of the second traction rope 206, improve its service life, and also ensure the smooth movement of the second traction rope 206.

[0058] In this embodiment, preferably, please refer to [reference needed]. Figure 1-2 , Figure 5 and Figure 10 A grid 23 is installed inside the outlet pipe 3, and an installation port 24 is provided at the corresponding position of the grid 23. A cover plate 25 is hinged to the installation port 24, and a limiting component 26 is provided inside the installation port 24 to restrict the grid 23. Through the grid 23, when it sinks to the bottom under the action of gravity, lighter organic matter separates from sand and is discharged from the outlet pipe 3 with the water flow. At this time, floating objects such as leaves on the water flow will be blocked by the grid 23 in the outlet pipe 3, which can prevent floating objects such as leaves from flowing out with the water. This can filter floating objects, improve the subsequent water treatment effect, and improve the practicality of this device.

[0059] When installing the bar screen 23, open the cover plate 25 and insert the bar screen 23 into the outlet pipe 3 through the installation port 24. The limiting component 26 then restricts the bar screen 23 to ensure its stability during use. After closing the cover plate 25 and securing it, it is ready for use. After a period of use, open the cover plate 25 and release the limiting component 26 from the bar screen 23. The bar screen 23 can then be removed from the outlet pipe 3 for cleaning or replacement. This convenient and quick process saves time and effort, improving the performance of the device.

[0060] In this embodiment, preferably, please refer to [reference needed]. Figure 5 and Figure 10 The limiting component 26 includes: a recessed groove 261, which is opened on the side wall of the mounting port 24, and a limiting block 262 is slidably provided in the recessed groove 261; an elastic element 263, one end of which is connected to the limiting block 262 and the other end of which is connected to the inner wall of the recessed groove 261. The elastic element 263 in this application is a spring. The inner wall of the water outlet pipe 3 is provided with multiple blocks 27, which are located on both sides of the grid mesh 23. When the grating 23 is inserted into the outlet pipe 3 through the mounting port 24, the grating 23 will squeeze the limiting block 262, and the limiting block 262 will enter the recessed groove 261 and compress the elastic element 263. When the grating 23 is fully inserted into the outlet pipe 3, the limiting block 262 will no longer be under pressure. The rebound force of the recessed groove 261 will drive the limiting block 262 out of the recessed groove 261. Finally, the limiting block 262 will be above the grating 23. The limiting block 262 can restrict the grating 23, and the bottom side of the grating 23 will be restricted by the stop block 27 to ensure the stability of the grating 23 in use.

[0061] This application can also employ a filter press tailwater reuse system:

[0062] In this environmental dredging project, a large amount of alkaline agents are added to the homogenization tank during sludge treatment to react with the wastewater. When the sludge is subsequently treated by a filter press, which primarily performs solid-liquid separation, the effluent from the filter press still contains soluble alkaline substances that were not fully reacted in the homogenization tank – the role of the alkaline agents. This effluent from the filter press is collected and stored, and then discharged into a regulating tank. The alkaline substances in this effluent can again combine with fine particles in the sludge in the regulating tank to form flocs and precipitate. Adding this recovered effluent to the regulating tank accelerates the sedimentation of particulate matter in the sludge, thereby improving the wastewater treatment effect. The amount of effluent added from the filter press can be controlled by the amount of sludge produced at the front end, ensuring that the agent concentration in the regulating tank is within a reasonable range, guaranteeing sedimentation and subsequent treatment effects.

[0063] It should be understood that the examples and embodiments described herein are for illustrative purposes only and are not intended to limit the invention. Those skilled in the art can make various modifications or changes based on them. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the invention should be included within the protection scope of the invention.

[0064] It should be noted that if the embodiments of the present invention involve directional indicators such as up, down, left, right, front, back, etc., the directional indicators are only used to explain the relative positional relationship and movement of the components in a specific posture as shown in the attached figure. If the specific posture changes, the directional indicators will also change accordingly.

[0065] Furthermore, if the embodiments of this invention involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the meaning of "and / or" throughout the text includes three parallel solutions; for example, "A and / or B" includes solution A, solution B, or a solution where both A and B are satisfied simultaneously. Furthermore, "multiple" refers to two or more. Moreover, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this invention.

Claims

1. An environmentally friendly dredging sludge pre-sedimentation device, comprising a sedimentation tank (1), characterized in that, Also includes: The inlet pipe (2) and outlet pipe (3) are both located on the sedimentation tank (1) and are connected to its interior; A support plate (4) is provided on the top of the sedimentation tank (1). A rotating shaft (5) is rotatably provided on the support plate (4) via a bearing. Multiple adjustable impellers (6) are provided on the rotating shaft (5). A drive mechanism (7) is provided on the support plate (4) and is used to drive the rotating shaft (5) to rotate; A fixing mechanism (8) is provided on the rotating shaft (5) for restricting and fixing the impeller (6) when it is adjusted to different heights; The outer wall of the rotating shaft (5) is slidably fitted with a collar (9), and multiple impellers (6) are evenly arranged on the collar (9). Multiple fixing holes (10) are opened on the inner wall of the collar (9). The rotating shaft (5) has a transmission cavity (11) inside, and the fixing mechanism (8) includes: A telescopic component (81) is provided on the inner wall of the transmission cavity (11), and a moving rod (82) is provided at the telescopic end of the telescopic component (81). Multiple block groups are evenly distributed at different heights on the rotating shaft (5). Each block group includes multiple fixed blocks (83) that move through the outer wall of the rotating shaft (5) and are adapted to the fixed holes (10). Multiple connecting rods (84) are hinged at one end to each of the fixed blocks (83) and at the other end to the rotating shaft (5); It also includes a top plate (17) disposed at the end of the rotating shaft (5), a through cavity (18) is provided in the rotating shaft (5), a through hole (19) communicating with the through cavity (18) is provided on the top plate (17), and a lifting component (20) for driving the collar (9) to move up and down is provided on the top plate (17). The lifting component (20) includes two support plates (201) on the top plate (17), and a rotating rod (202) is rotatably arranged between the two support plates (201). The support plate (201) is provided with a second driving member (203) that is drivenly connected to the rotating rod (202). The outer wall of the rotating rod (202) is provided with a rope wheel (204). A first traction rope (205) is wound on the rope wheel (204). The movable end of the first traction rope (205) is provided with a plurality of second traction ropes (206). The other end of the second traction rope (206) is connected to the collar (9).

2. The environmentally friendly dredging sludge pre-sedimentation device according to claim 1, characterized in that, The drive mechanism (7) includes a first drive member (71) disposed on the support plate (4), the output end of the first drive member (71) is provided with a gear (72), and the outer wall of the rotating shaft (5) is provided with a gear ring (73) that meshes with the gear (72).

3. The environmentally friendly dredging sludge pre-sedimentation device according to claim 1, characterized in that, The outer wall of the collar (9) is provided with a plurality of mounting blocks (12), the mounting blocks (12) are provided with slots (13), the mounting blocks (12) are provided with through holes (14), the impeller (6) is provided with insert plates (15) that are compatible with the slots (13), and the insert plates (15) are provided with mounting holes (16) that are compatible with the through holes (14).

4. The environmentally friendly dredging sludge pre-sedimentation device according to claim 1, characterized in that, The outer wall of the rotating shaft (5) is provided with multiple brackets (21), and a steering wheel (22) is rotatably provided on the bracket (21) for turning the second traction rope (206).

5. The environmentally friendly dredging sludge pre-sedimentation device according to claim 1, characterized in that, The water outlet pipe (3) is provided with a grid mesh (23), and the water outlet pipe (3) is provided with an installation port (24) at the position corresponding to the grid mesh (23). A cover plate (25) is hinged to the installation port (24), and a limiting component (26) for limiting the grid mesh (23) is provided in the installation port (24).

6. The environmentally friendly dredging sludge pre-sedimentation device according to claim 5, characterized in that, The limiting component (26) includes: An inner groove (261) is provided on the side wall of the mounting port (24), and a limiting block (262) is slidably provided in the inner groove (261). The elastic element (263) is connected at one end to the limiting block (262) and at the other end to the inner wall of the recessed groove (261).

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