Sludge dewatering device and method for engineering environmental protection construction

Abstract

The application discloses a sludge dewatering device and method for engineering environmental protection construction, relates to the technical field of sludge dewatering, and comprises a rack, a dewatering bin, an extrusion dewatering mechanism, a communication bin, a drain pipe, a fixed pipe, a sliding pipe, filter cloth and a connecting ring. The lower end of the sliding pipe is coaxially fixedly connected with a connecting part. The connecting part is located in the ring hole of the connecting ring and is fixedly connected with the ring hole wall of the connecting ring. The connecting part is provided with a sludge discharge port. The rack is provided with a water storage tank located below the filter cloth. A screwing mechanism is used for driving the sliding pipe to move downward and rotate, so that the filter cloth is in an elongated and wrung state. In the application, the filter cloth can be used for further filtering of sewage, so that the liquid and solid in the sewage can be separated. The filter cloth is wrung by the screwing mechanism, so that the separated solid in the sewage can be compacted. In the compacting process, the liquid is further extruded, so that the separation of the solid and liquid in the sewage is more thorough, and the dewatering effect of the sludge is improved.

Description

Technical Field

[0001] This invention relates to the field of sludge dewatering technology, specifically to a sludge dewatering device and method for environmental protection engineering construction. Background Technology

[0002] Sludge dewatering refers to the process of removing water from sludge through physical or chemical methods, thereby reducing sludge volume and facilitating transportation and disposal. The main methods of sludge dewatering include mechanical dewatering (such as belt filter presses, centrifugal dewatering machines, plate and frame filter presses, etc.) and natural dewatering (such as drying beds). Mechanical dewatering is highly efficient and suitable for large-scale treatment, while natural dewatering is low-cost but time-consuming. Key parameters for sludge dewatering include moisture content (typically required to be reduced to 60%-80%), throughput (e.g., 60-120 kg / h of oven-dried sludge), and additive ratio (e.g., 1:1000% flocculant).

[0003] In the prior art, when using spiral blades to compress and dewater sludge, the spiral blades rotate, shearing and conveying the sludge while simultaneously compressing it. During the compression process, wastewater in the sludge will be filtered out through the filter holes. The filtered wastewater usually contains a certain amount of diluted sludge. This relatively thin sludge cannot be conveyed through the spiral blades, thus failing to produce a compression effect. Therefore, a sludge dewatering device is needed to further dewater the filtered wastewater. Summary of the Invention

[0004] The purpose of this invention is to provide a sludge dewatering device and method for environmental protection engineering construction, so as to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a sludge dewatering device for environmental protection engineering construction, comprising a dewatering chamber mounted on a frame, wherein a plurality of filter holes are provided on the lower side wall of the dewatering chamber, and the frame is provided with a squeezing dewatering mechanism, and further comprising:

[0006] A connecting chamber is fixedly connected to the dehydration chamber and communicates with the filter holes; a drain pipe is provided at the bottom of the connecting chamber.

[0007] A fixed pipe is coaxially connected to the drain pipe. A sliding pipe is slidably fitted around the periphery of the fixed pipe. The lower end of the sliding pipe is closed and a first connecting groove is provided on its lower side wall. A second connecting groove is provided on the lower side wall of the fixed pipe to cooperate with the first connecting groove.

[0008] The filter cloth, when fully extended, has a rotating outer contour and two through-hole mounting holes. The upper end of the fixed tube is fixed to one of the mounting holes, and the other mounting hole is fixed to a connecting ring. The lower end of the sliding tube is coaxially fixed to a connecting part. The connecting part is located inside the annular hole of the connecting ring and is fixed to the annular hole wall of the connecting ring. The connecting part has a through-hole sludge discharge port. The frame has a water storage tank located below the filter cloth.

[0009] A twisting mechanism is provided on the frame and is used to drive the sliding tube to move downward and rotate, thereby causing the filter cloth to be stretched and twisted.

[0010] Through the above technical solution, the wastewater can be further filtered using filter cloth, allowing the liquid and solid in the wastewater to be separated. Furthermore, by twisting the filter cloth through a screwing mechanism, the separated solids in the wastewater can be compacted. During the compaction process, the liquid is further squeezed out, thereby making the separation of solids and liquid in the wastewater more thorough and improving the dewatering effect on sludge.

[0011] Furthermore, the extrusion dehydration mechanism includes a rotating shaft that is horizontally rotatably connected to the frame. The rotating shaft is coaxially inserted into the dehydration chamber. A spiral blade is fixedly sleeved on the part of the rotating shaft located inside the dehydration chamber. A motor is installed at one end of the frame, and the motor is drivenly connected to the rotating shaft.

[0012] The above technical solution involves a motor driving a rotating shaft to rotate, which in turn drives a spiral blade to rotate, thereby conveying the sludge into the dewatering chamber and allowing the spiral blade to compress the sludge.

[0013] Furthermore, a feeding port is connected to one end of the dehydration chamber.

[0014] The above technical solution involves setting up a feeding port to facilitate the feeding of sludge into the dewatering chamber.

[0015] Furthermore, the frame is equipped with a hydraulic cylinder via a hydraulic cylinder support, and the hydraulic cylinder is driven by a back pressure plate, which is used to seal the open end of the dehydration chamber.

[0016] The above technical solution involves a hydraulic cylinder driving a back pressure plate to move toward the dewatering chamber, thereby sealing the open end of the dewatering chamber. After dewatering, the hydraulic cylinder drives the back pressure plate to move in the opposite direction, opening the open end of the dewatering chamber, allowing the dewatered sludge to fall from the open end of the dewatering chamber for collection.

[0017] Furthermore, the water storage tank is provided with a drain outlet.

[0018] The above technical solution enables the liquid that passes through the filter cloth to be discharged from the drain outlet.

[0019] Furthermore, the screwing mechanism includes a lifting cylinder vertically installed at the bottom of the water storage tank, the cylinder rod end of the lifting cylinder is rotatably connected to the connecting part, the inner wall of the sliding tube is rotatably embedded with balls, and the periphery of the fixed tube is provided with a spiral rolling groove for the balls to engage and roll freely.

[0020] With the above technical solution, the connecting part is driven to move downward by the lifting cylinder. When the connecting part moves downward, the ball will roll in the spiral rolling groove, which will allow the sliding tube to rotate on the periphery of the fixed tube. During the rotation, the sliding tube can twist the lower end of the filter cloth.

[0021] Furthermore, the sliding tube is provided with a spreading unit, which is used to spread the filter cloth when the sliding tube moves upward. The spreading unit includes multiple spreading rods hinged to the upper end of the fixed tube. A rotating ring is coaxially and slidably fitted on the lower periphery of the sliding tube. The rotating ring is hinged with multiple hinge rods, and the upper end of each hinge rod is correspondingly hinged to the spreading rod.

[0022] Through the above technical solution, when the sliding tube moves downward, it can cause the rotating ring to move downward. When the rotating ring moves downward, it will cause the hinge rod to drive the spreading rod to swing downward, thereby changing the filter cloth from an open state to a contracted state. This makes it easier to twist the filter cloth when the sliding tube rotates. In addition, when the sliding tube moves upward, the spreading rod can unfold, thereby opening the filter cloth. This prevents the filter cloth from folding and reducing the permeability of sewage, which would prevent sewage from quickly passing through the filter cloth and accumulating inside the filter cloth.

[0023] Furthermore, a limiting ring is fixedly fitted on the upper side of the sliding tube, and a floating spring is wrapped around the periphery of the sliding tube. The two ends of the floating spring elastically abut against the limiting ring and the rotating ring, respectively, in the direction of the spring force.

[0024] Through the above technical solution, the floating spring generates an elastic resisting force on the limiting ring, so that when the downward movement of the sliding tube is large, the rotating ring slides on the sliding tube and compresses the floating spring, thereby preventing the hinge rod from being pulled and broken.

[0025] Furthermore, a baffle is slidably fitted around the periphery of the sliding tube. When the baffle abuts against the upper surface of the connecting part, it will close the sludge discharge port. Multiple connecting rods are vertically fixed to the baffle. The connecting rods slidably penetrate the connecting part. A protrusion is fixed to the water storage tank. The connecting rods and the protrusion are used in conjunction.

[0026] With the above technical solution, in the initial state, the baffle will seal the sludge discharge port to prevent solids in the sewage from falling into the water storage tank and remixing with the liquid in the water storage tank. In addition, when the sliding tube moves downward to the fixed position, the lower end of the connecting rod will abut against the upper surface of the protrusion, so that the connecting rod can move the baffle and the connecting part relatively away, allowing the solids in the filter cloth to fall from the sludge discharge port, thus facilitating collection.

[0027] A sludge dewatering method for environmental protection engineering construction, applied to the sludge dewatering device described above, includes:

[0028] Watery sludge is discharged into the dewatering chamber, where the extrusion dewatering mechanism extrudes and transports the sludge. During the transport and extrusion process, the wastewater in the sludge flows through the filter holes into the connecting chamber, and then the liquid enters the fixed pipe through the drain pipe.

[0029] The wastewater will then enter the first connecting channel from the second connecting channel, and then enter the filter cloth from the first connecting channel. The wastewater will be filtered through the filter cloth, and the liquid will flow through the filter cloth into the water storage tank, while the sludge in the wastewater will remain in the filter cloth.

[0030] After the sludge is dewatered, the sliding tube moves downward through the twisting mechanism. During the downward movement of the sliding tube, it also rotates. When rotating, the filter cloth is twisted, which compacts the sludge and compresses the liquid, allowing the liquid to pass through the filter cloth quickly.

[0031] Through the above technical solution, the filter cloth can further filter sewage, so that the liquid and solid in the sewage can be separated. The filter cloth is twisted by the twisting mechanism, which can then compact the separated solids in the sewage. During the compaction process, the liquid is further squeezed out, thereby making the separation of solids and liquid in the sewage more thorough and improving the dewatering effect of sludge.

[0032] Compared with the prior art, the beneficial effects of the present invention are:

[0033] 1. In this invention, the filter cloth can further filter the sewage, so that the liquid and solid in the sewage can be separated. The filter cloth is twisted by the twisting mechanism, which can then compact the separated solid in the sewage. During the compaction process, the liquid is further squeezed out, thereby making the separation of solid and liquid in the sewage more thorough and improving the dewatering effect of sludge.

[0034] 2. In this invention, when the sliding tube moves downward, it can cause the rotating ring to move downward. When the rotating ring moves downward, it will cause the hinge rod to drive the spreading rod to swing downward, thereby changing the filter cloth from an open state to a contracted state. This makes it easier to twist the filter cloth when the sliding tube rotates. In addition, when the sliding tube moves upward, the spreading rod can unfold, thereby opening the filter cloth. This prevents the filter cloth from folding and causing a decrease in the permeability of sewage, which would prevent sewage from quickly passing through the filter cloth and accumulating inside the filter cloth.

[0035] 3. In this invention, by setting a baffle, a connecting rod, and a protrusion, in the initial state, the baffle will seal the sludge discharge port to prevent solids in the sewage from falling into the water storage tank and remixing with the liquid in the water storage tank. In addition, when the sliding tube moves downward to a fixed position, the lower end of the connecting rod will abut against the upper surface of the protrusion, thereby allowing the connecting rod to move the baffle and the connecting part relatively away, so that the solids in the filter cloth can fall from the sludge discharge port, thus facilitating collection. Attached Figure Description

[0036] Figure 1 This is a schematic diagram of the overall structure of a sludge dewatering device for environmental protection construction in engineering projects according to the present invention.

[0037] Figure 2 for Figure 1 A diagram illustrating the positional relationship from another perspective;

[0038] Figure 3 for Figure 1 A schematic diagram showing the positional relationship of the middle section after it has been cut open;

[0039] Figure 4 for Figure 3 Enlarged schematic diagram of the local structure at point A;

[0040] Figure 5 This is a schematic diagram showing the positional relationship of the filter cloth, sliding tube, and fixed tube after assembly in this invention;

[0041] Figure 6 for Figure 5 A schematic diagram showing the positional relationship of the filter cloth (omitted).

[0042] Figure 7 for Figure 6 A diagram illustrating the positional relationship from another perspective;

[0043] Figure 8 for Figure 6 A schematic diagram of the explosive decomposition of the medium structure.

[0044] The following are explanations of the reference numerals in the figures: 1. Frame; 2. Motor; 3. Feed inlet; 4. Dewatering chamber; 5. Back pressure plate; 6. Cylinder support; 7. Cylinder; 8. Rotating shaft; 9. Spreading rod; 10. Protrusion; 11. Lifting cylinder; 12. Water storage tank; 13. Filter cloth; 14. Connecting chamber; 15. Drain pipe; 16. Spiral blade; 17. Filter hole; 18. Sliding pipe; 19. Drain outlet; 20. Hinge rod; 21. Limiting ring; 22. Floating spring; 23. Rotating ring; 24. Baffle; 25. Return spring; 26. Nut; 27. First connecting groove; 28. Connecting part; 29. ​​Connecting rod; 30. Sludge discharge port; 31. Fixed pipe; 32. Second connecting groove; 33. Spiral rolling groove; 34. Ball bearing. 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 Figures 1-8 This invention provides a technical solution: a sludge dewatering device for environmental engineering construction, comprising a frame 1 mounted on a placement surface via multiple legs, a cylindrical dewatering chamber 4 horizontally mounted on the frame 1, the dewatering chamber 4 being closed at one end and open at the other, with a feeding port 3 fixedly connected to the periphery of the closed end of the dewatering chamber 4, the feeding port 3 being connected to an external conveying pump via a water pipe, the conveying pump conveying water-containing sludge to the feeding port 3, and then conveying it into the dewatering chamber 4, the lower side wall of the dewatering chamber 4 having multiple filter holes 17, and a rotating shaft 8 horizontally rotatably connected to the frame 1, the rotating shaft 8 being coaxially inserted through the dewatering chamber 4. Inside, a spiral blade 16 is coaxially fixed to the periphery of the rotating shaft 8. The spiral blade 16 is located inside the dehydration chamber 4. A motor 2 is installed on one side of the frame 1 corresponding to the closed end of the dehydration chamber 4. The motor shaft of the motor 2 is driven to the end of the rotating shaft 8. A cylinder support 6 is provided at the end of the frame 1 away from the motor 2. Two cylinders 7 are horizontally installed on the cylinder support 6. The ends of the telescopic rods of the two cylinders 7 are driven to the back pressure plate 5. A through hole is opened on the surface of the back pressure plate 5 for the rotating shaft 8 to pass freely. In addition, the telescopic rod of the cylinder 7 extends and drives the back pressure plate 5 to move towards the dehydration chamber 4, so that the back pressure plate 5 can close the open end of the dehydration chamber 4.

[0047] A connecting chamber 14 is fixedly connected to the lower wall of the dehydration chamber 4. The connecting chamber 14 is in a through-hole state with multiple filter holes 17. In addition, a drain pipe 15 is vertically fixedly connected to the bottom of the connecting chamber 14. The lower end of the drain pipe 15 is connected to a fixed pipe 31, and the fixed pipe 31 and the drain pipe 15 are coaxially connected. A sliding pipe 18 is slidably fitted around the periphery of the fixed pipe 31. The lower end of the sliding pipe 18 is closed and a first connecting groove 27 is opened on its lower wall. A second connecting groove 32 is opened on the lower wall of the fixed pipe 31 to cooperate with the first connecting groove 27. When the sliding pipe 18 slides upward on the periphery of the fixed pipe 31, the first connecting groove 27 and the second connecting groove 32 are connected. The lower part of the connecting chamber 14... The frame is provided with a filter cloth 13. The outer contour of the filter cloth 13 is spherical or cylindrical when fully expanded. The filter cloth 13 has two through holes. The upper end of the fixing tube 31 is fixed to one of the mounting holes, and the other mounting hole is fixed to a connecting ring. The lower end of the sliding tube 18 is coaxially fixed to a connecting part 28. The connecting part 28 is located in the ring hole of the connecting ring and is fixed to the ring hole wall of the connecting ring, so that the lower side of the filter cloth 13 can move with the movement of the connecting part 28. The connecting part 28 has a through hole sludge discharge port 30. The frame 1 is provided with a water storage tank 12 located below the filter cloth 13. The water storage tank 12 has a drain port 19. The drain port 19 is connected to an external liquid collection device through a pipeline.

[0048] A lifting cylinder 11 is vertically installed at the bottom of the water storage tank 12. The cylinder rod end of the lifting cylinder 11 is rotatably connected to the connecting part 28. A ball bearing 34 is rotatably embedded in the inner wall of the sliding tube 18. A spiral rolling groove 33 is opened around the periphery of the fixed tube 31 for the ball bearing 34 to engage and roll freely. Multiple supporting rods 9 are arranged in an array along the axial direction at the upper end of the fixed tube 31. A rotating ring 23 is coaxially slidably fitted on the lower periphery of the sliding tube 18. Multiple hinge rods 20 are hinged to the rotating ring 23. The upper end of the hinge rod 20 is correspondingly hinged to the supporting rod 9. A limiting ring 21 is fixedly fitted on the upper side of the sliding tube 18. A floating spring 22 is wrapped around the periphery of the sliding tube 18. The two ends of the floating spring 22 elastically abut against the limiting ring 21 and the rotating ring 23 respectively in the direction of the elastic force. When the sliding tube 18 slides upward into place on the periphery of the fixed tube 31, the floating spring 22 has a downward elastic abutting force on the rotating ring 23.

[0049] A baffle 24 is slidably fitted around the periphery of the sliding tube 18. When the baffle 24 abuts against the upper surface of the connecting part 28, it will close the sludge discharge port 30. Multiple connecting rods 29 are vertically fixed to the baffle 24. The connecting rods 29 slidably penetrate the connecting part 28. A protrusion 10 is fixedly connected to the water storage tank 12. The connecting rods 29 and the protrusion 10 are used in conjunction. In addition, a nut 26 is threadedly fitted onto the lower end of the connecting rod 29. A return spring 25 is wrapped around the periphery of the connecting rod 29. The two ends of the return spring 25 elastically abut against the connecting part 28 and the nut 26 respectively in the direction of the elastic force.

[0050] Working principle of the invention:

[0051] An external conveying pump transports water-containing sludge to the feeding port 3, and then from the feeding port 3 to the dewatering chamber 4. The motor 2 is started, and the motor shaft of the motor 2 rotates, which drives the rotating shaft 8 to rotate. When the rotating shaft 8 rotates, it drives the spiral blade 16 to rotate. When the spiral blade 16 rotates, it can transport the sludge from the closed end of the dewatering chamber 4 to the back pressure plate 5 side. During the transportation process, the spiral blade 16 squeezes the sludge. When the sludge is blocked by the back pressure plate 5 and cannot move, the squeezing force generated by the spiral blade 16 on the sludge is large, so that the sewage in the sludge can be squeezed out and then flow into the connecting chamber 14 from the filter hole 17, and then into the fixed pipe 31 through the drain pipe 15. The sewage then enters the filter cloth 13 through the second connecting groove 32 and the first connecting groove 27. At this time, the liquid in the sewage will pass through the filter cloth 13 and flow into the water storage tank 12, while the solid in the sewage cannot pass through the filter cloth 13, so the solid will remain in the filter cloth 13.

[0052] After the sludge is dewatered, the hydraulic cylinder 7 is activated. The extension rod of the hydraulic cylinder 7 is shortened, and the back pressure plate 5 is moved away from the dewatering chamber 4. At this time, the motor 2 continues to rotate, so that the spiral blade 16 can drive the sludge to the open end of the dewatering chamber 4, so that the dewatered sludge can fall from the opening of the dewatering chamber 4 into the external collection device, and then the dewatered sludge is collected. After the sludge in the dewatering chamber 4 is collected, the lifting cylinder 11 is activated. The lifting cylinder 11 drives the connecting part 28 to move downward. When the connecting part 28 moves downward, the sliding tube 18 will slide downward on the periphery of the fixed tube 31.

[0053] When the connecting part 28 moves downward, the ball bearing 34 rolls within the spiral rolling groove 33, allowing the sliding tube 18 to rotate around the periphery of the fixed tube 31. During this rotation, the sliding tube 18 can twist the lower end of the filter cloth 13. Furthermore, as the sliding tube 18 moves downward, it causes the rotating ring 23 to move downward. This downward movement of the rotating ring 23 causes the hinge rod 20 to swing the spreading rod 9 downward, thus changing the filter cloth 13 from an open state to a contracted state. During the twisting process, the filter cloth 13 compacts the sludge and simultaneously exerts pressure on the liquid. When the liquid passes through the filter cloth 13 quickly and the sliding tube 18 moves downward to a fixed position, the lower end of the connecting rod 29 will abut against the upper surface of the protrusion 10. This allows the connecting rod 29 to move the baffle 24 away from the connecting part 28, allowing the solids in the filter cloth 13 to fall from the sludge discharge port 30 for easy collection. At this time, the return spring 25 is compressed by the connecting part 28 and accumulates elastic potential energy. When the cylinder rod of the lifting cylinder 11 extends, the sliding tube 18 will move upward and the elastic potential energy accumulated by the return spring 25 will be released, allowing the baffle 24 to re-close the sludge discharge port 30.

[0054] It should be noted that, in this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A sludge dewatering device for environmental protection engineering construction, comprising a dewatering chamber (4) mounted on a frame (1), wherein a plurality of filter holes (17) are provided on the lower side wall of the dewatering chamber (4), and the frame (1) is provided with a squeezing dewatering mechanism, characterized in that, Also includes: A connecting chamber (14) is fixed to the dehydration chamber (4) and connected to the filter hole (17). A drain pipe (15) is provided at the bottom of the connecting chamber (14). A fixed pipe (31) is coaxially connected to the drain pipe (15). A sliding pipe (18) is slidably fitted around the periphery of the fixed pipe (31). The lower end of the sliding pipe (18) is closed and a first connecting groove (27) is provided on the lower side wall. A second connecting groove (32) that cooperates with the first connecting groove (27) is provided on the lower side wall of the fixed pipe (31). The filter cloth (13) has a rotating outer contour after being fully extended, and has two through holes for mounting. The upper end of the fixed tube (31) is fixed to one of the mounting holes, and the other mounting hole is fixed to a connecting ring. The lower end of the sliding tube (18) is coaxially fixed to a connecting part (28). The connecting part (28) is located inside the ring hole of the connecting ring and is fixed to the ring hole wall of the connecting ring. The connecting part (28) has a through hole for discharging mud (30). The frame (1) has a water storage tank (12) located below the filter cloth (13). A twisting mechanism is provided on the frame (1) and is used to drive the sliding tube (18) to move downward and rotate, thereby causing the filter cloth (13) to be in a stretched and twisted state; The screwing mechanism includes a lifting cylinder (11) vertically installed at the bottom of the water storage tank (12). The cylinder rod end of the lifting cylinder (11) is rotatably connected to the connecting part (28). The inner wall of the sliding tube (18) is rotatably embedded with a ball (34). The periphery of the fixed tube (31) is provided with a spiral rolling groove (33) for the ball (34) to engage and roll freely. The sliding tube (18) is provided with a spreading unit, which is used to spread the filter cloth (13) when the sliding tube (18) moves upward. The spreading unit includes a plurality of spreading rods (9) hinged to the upper end of the fixed tube (31). A rotating ring (23) is coaxially and slidably fitted on the lower periphery of the sliding tube (18). The rotating ring (23) is hinged with a plurality of hinge rods (20). The upper end of the hinge rods (20) is correspondingly hinged to the spreading rods (9). The upper side of the sliding tube (18) is fixedly fitted with a limiting ring (21), and a floating spring (22) is wrapped around the periphery of the sliding tube (18). The two ends of the floating spring (22) elastically abut against the limiting ring (21) and the rotating ring (23) respectively in the direction of the elastic force.

2. The sludge dewatering device for environmental protection construction according to claim 1, characterized in that, The extrusion dehydration mechanism includes a rotating shaft (8) that is horizontally rotatably connected to the frame (1). The rotating shaft (8) passes through the dehydration chamber (4) and is coaxial with the dehydration chamber (4). A spiral blade (16) is fixedly sleeved on the part of the rotating shaft (8) located inside the dehydration chamber (4). A motor (2) is installed at one end of the frame (1), and the motor (2) is driven by the rotating shaft (8).

3. The sludge dewatering device for environmental protection construction according to claim 1, characterized in that, The dehydration chamber (4) has a feeding port (3) connected to one end.

4. The sludge dewatering device for environmental protection construction according to claim 1, characterized in that, The frame (1) is equipped with a cylinder (7) via a cylinder support (6). The cylinder (7) drives a back pressure plate (5) which is used to close the open end of the dehydration chamber (4).

5. The sludge dewatering device for environmental protection construction according to claim 1, characterized in that, The water storage tank (12) is provided with a drain outlet (19).

6. The sludge dewatering device for environmental protection construction according to claim 1, characterized in that, The sliding tube (18) is slidably fitted with a baffle (24). When the baffle (24) abuts against the upper surface of the connecting part (28), it will close the sludge discharge port (30). The baffle (24) is vertically fixed with multiple connecting rods (29). The connecting rods (29) slidably penetrate the connecting part (28). The water storage tank (12) is fixed with a protrusion (10). The connecting rods (29) and the protrusion (10) are used in conjunction.

7. A sludge dewatering method for environmental protection engineering construction, applied to the sludge dewatering device according to any one of claims 1 to 6, characterized in that, include: Watery sludge is discharged into the dewatering chamber (4), and the sludge in the dewatering chamber (4) is squeezed and transported by the squeezing dewatering mechanism. During the transportation and squeezing process, the sewage in the sludge will flow into the connecting chamber (14) through the filter hole (17), and then the liquid will enter the fixed pipe (31) through the drain pipe (15). Subsequently, the sewage will enter the first connecting channel (27) through the second connecting channel (32), and then enter the filter cloth (13) through the first connecting channel (27). The sewage will be filtered through the filter cloth (13), and the liquid will flow through the filter cloth (13) into the water storage tank (12), while the sludge in the sewage will remain in the filter cloth (13). After the sludge is dewatered, the sliding tube (18) moves downward through the twisting mechanism. During the downward movement of the sliding tube (18), the sliding tube (18) rotates at the same time. When rotating, the filter cloth (13) is twisted, so that the filter cloth (13) compacts the sludge during the twisting process and exerts pressure on the liquid, so that the liquid quickly passes through the filter cloth (13).

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