Sludge dewatering device for sewage treatment

Abstract

The application discloses a sludge dewatering device for sewage treatment and belongs to the technical field of sewage treatment. The device comprises a dewatering mechanism, a driving mechanism and an auxiliary mechanism. The dewatering mechanism comprises a filter bag. The driving mechanism comprises a rotary driving assembly, a moving driving assembly and two constraint components. The constraint components are used for binding the filter bag. The rotary driving assembly is used for driving the constraint component at the bottom to rotate around the axis of the filter bag. The moving driving assembly is used for driving the constraint component at the bottom to move along the axial direction of the filter bag. The auxiliary mechanism comprises an upper extruding piece, a lower extruding piece and an auxiliary driving assembly. The auxiliary driving assembly drives the lower extruding piece to move along the axial direction of the filter bag relative to the upper extruding piece. The application solves the problem that the service life of the filter bag is greatly reduced due to the large pulling strength during the rotation and the fixed position of both ends of the filter bag when the filter bag is twisted to dewater the sludge.

Description

Technical Field

[0001] This invention belongs to the field of wastewater treatment technology, specifically a sludge dewatering device for wastewater treatment. Background Technology

[0002] In the field of sludge treatment, dewatering is the core process for reducing sludge volume and achieving solid-liquid separation. Inadequately dewatered sludge typically contains 70%-90% water; direct disposal significantly increases transportation energy consumption and landfill costs. Furthermore, high-moisture sludge easily generates leachate, posing an environmental risk of groundwater pollution. Current mainstream technologies primarily employ geotextile wrapping or mechanical dewatering with filter bags.

[0003] For example, Chinese utility model patent CN208517260U discloses a sludge dewatering machine. This sludge dewatering machine dewaters sludge by rotating and tightening filter bags. It has a simple structure, low cost, and can hold a large amount of sludge in the filter bags at one time, resulting in a large processing capacity. It also uses high-pressure gas backflushing to clean the filter bags, making cleaning convenient and operation simple, which facilitates sludge dewatering operations. However, the fixed constraint at both ends of the filter bags causes the axial tensile stress and circumferential torsional stress of the filter bags to be superimposed, forming a mechanical stress concentration area. This results in a large tensile strength on the filter bags, and under long-term sludge dewatering operations, the lifespan of the filter bags is greatly reduced. Summary of the Invention

[0004] This invention overcomes the shortcomings of the prior art and proposes a sludge dewatering device for sewage treatment; it solves the problem that when using a rotating and tightening filter bag to dewater sludge, the fixed positions at both ends of the filter bag result in high tensile strength during tightening, which leads to a significant reduction in the lifespan of the filter bag under long-term operation.

[0005] This invention is achieved through the following technical solution:

[0006] A sludge dewatering device for wastewater treatment includes a dewatering mechanism, a driving mechanism, and an auxiliary mechanism. The dewatering mechanism includes a feed pipe, a filter bag, and a discharge pipe connected in sequence. The driving mechanism includes a rotary driving component, a moving driving component, and two constraint components. The two constraint components are respectively disposed at the upper and lower ends of the filter bag and are used to tighten the filter bag. The rotary driving component drives the constraint component located at the bottom to rotate around the axis of the filter bag, and the moving driving component drives the constraint component located at the bottom to move along the axial direction of the filter bag.

[0007] The auxiliary mechanism includes an upper extruder, a lower extruder, and an auxiliary drive assembly. The bottom end of the upper extruder extends into the interior of the filter bag, and a sliding cavity is provided inside the bottom end of the upper extruder. The outer wall of the lower extruder is slidably connected to the inner wall of the sliding cavity. One side of the lower extruder is connected to the auxiliary drive assembly, and the auxiliary drive assembly drives the lower extruder to move relative to the upper extruder along the axial direction of the filter bag.

[0008] Furthermore, the constraint component includes a constraint drive assembly and multiple knotting members. The multiple knotting members are arranged in a circumferential array with the axis of the filter bag as the center. One side of each of the multiple knotting members is connected to the constraint drive assembly, which is used to drive the multiple knotting members to move radially along the filter bag.

[0009] Furthermore, the constraint drive assembly includes a fixed housing, on the inner wall of which multiple racks are slidably mounted. Each rack corresponds to a multiple retaining member. One end of each rack is fixedly connected to its corresponding retaining member. One side of each rack is meshed with a B gear, and one side of each B gear is meshed with the same internal gear ring. One side of the internal gear ring is rotatably connected to the inner wall of the fixed housing. Each B gear has a rotating shaft fixedly fitted inside it. One end of each rotating shaft is rotatably connected to the fixed housing. The other end of one of the rotating shafts is connected to an A rotary drive member for driving it to rotate around its own axis.

[0010] Furthermore, the moving drive assembly includes a turntable and two A-type telescopic drive members. The outer wall of the discharge pipe is movably connected to the turntable. The moving ends of the two A-type telescopic drive members pass through the turntable and are fixedly connected to the fixed shell inside the constraint component at the bottom. The fixed ends of the two A-type telescopic drive members are fixedly connected to the turntable.

[0011] Furthermore, the rotary drive assembly includes an external gear ring, gear A, and rotary drive component B. Gear A is fixedly sleeved outside the output shaft of rotary drive component B. One side of gear A meshes with the external gear ring, which is fixedly sleeved outside the turntable.

[0012] Furthermore, the auxiliary drive assembly includes a sleeve and a cylindrical groove formed on the lower extruder. The top end of the sleeve is rotatably connected to the upper extruder. A drive rod is slidably connected inside the sleeve. A push rod is fixedly installed on the outer wall of the bottom end of the sleeve. A spiral groove is formed on the inner wall of the cylindrical groove. The outer wall of the push rod is slidably connected to the inner wall of the spiral groove. A spring is provided between the sleeve and the drive rod. The two ends of the spring are fixedly connected to the sleeve and the drive rod, respectively.

[0013] Furthermore, the bottom of the drive rod is covered with a friction pad.

[0014] Furthermore, the auxiliary driving component is a B telescopic driving member, the fixed end of which is fixedly connected to the upper extrusion member, and the movable end of which is fixedly connected to the lower extrusion member.

[0015] Furthermore, it also includes a processing chamber, the top of which is provided with a feeding trough, and the interior of which is provided with a partition plate, which divides the interior of the processing chamber into a dehydration zone and a discharge zone; the filter bag is placed inside the dehydration zone, the top end of the feeding pipe passes through the bottom plate of the feeding trough and is fixedly connected to the bottom plate of the feeding trough, and the bottom end of the discharge pipe extends into the discharge zone.

[0016] Furthermore, multiple sets of corresponding dehydration mechanisms, drive mechanisms, and auxiliary mechanisms are evenly installed inside the processing chamber.

[0017] The beneficial effects of this invention compared to the prior art are as follows:

[0018] This invention drives the filter bag to rotate around an axis by rotating the bottom constraint component, which forms a spiral extrusion on the sludge to achieve dewatering. At the same time, the moving drive component moves the bottom constraint component upward, causing the filter bag to shrink axially, preventing the filter bag from breaking due to stress concentration during the twisting process and extending its service life.

[0019] By using the upper and lower extrusion components in the auxiliary mechanism, the sludge is twisted and squeezed at the bottom of the filter bag. The lower extrusion component moves downward relative to the upper extrusion component, and the sludge is dispersed by mechanical pressure. This effectively solves the problem of uneven dewatering in the central area of ​​traditional devices, and effectively improves the sludge dewatering efficiency and dewatering effect. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the external three-dimensional structure provided in an embodiment of the present invention;

[0021] Figure 2 This is a schematic diagram of a first partial cross-sectional structure provided in an embodiment of the present invention;

[0022] Figure 3 This is a schematic diagram showing the combination of the rotation drive assembly, the movement drive assembly, and the constraint component provided in an embodiment of the present invention;

[0023] Figure 4 This is a schematic diagram of the constraint component structure provided in an embodiment of the present invention;

[0024] Figure 5 A schematic diagram illustrating the combination of the feed pipe, filter bag, and discharge pipe provided in an embodiment of the present invention;

[0025] Figure 6 This is a schematic diagram of a second partial cross-sectional structure provided in an embodiment of the present invention;

[0026] Figure 7 Provided for embodiments of the present invention Figure 6 Enlarged diagram of point A in the diagram;

[0027] Figure 8 A schematic diagram illustrating the combination of the lower extruder, cylindrical groove, and spiral groove provided in an embodiment of the present invention;

[0028] Figure 9 This is a schematic diagram showing the combination of the upper extrusion member, the lower extrusion member, and the B telescopic drive member provided in an embodiment of the present invention.

[0029] Explanation of reference numerals in the attached figures:

[0030] 100. Processing chamber; 101. Feed chute; 102. Divider plate; 103. Dehydration zone; 104. Discharge zone; 105. Discharge port.

[0031] 200. Dewatering mechanism; 210. Feed pipe; 220. Filter bag; 230. Discharge pipe.

[0032] 300. Drive mechanism; 310. Rotary drive assembly; 311. External gear ring; 312. Gear A; 313. Rotary drive component B; 320. Motion drive assembly; 321. Turntable; 322. Telescopic drive component A; 330. Constraint component; 331. Gear clamp; 332. Fixed shell; 333. Rack; 334. Gear B; 335. Internal gear ring; 336. Rotating shaft; 337. Rotary drive component A.

[0033] 400, Auxiliary mechanism; 410, Upper extrusion component; 420, Lower extrusion component; 430, Sleeve; 440, Drive rod; 441, Friction pad; 450, Cylindrical groove; 460, Push rod; 470, Spiral groove; 480, Spring; 490, B Telescopic drive component. Detailed Implementation

[0034] To make the technical problems to be solved, the technical solutions, and the beneficial effects of this invention clearer, the invention will be further described in detail with reference to the embodiments and accompanying drawings. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention. The technical solutions of this invention are described in detail below with reference to the embodiments and accompanying drawings, but the scope of protection is not limited thereto.

[0035] Please see Figures 1 to 8 This embodiment proposes a sludge dewatering device for wastewater treatment, including a treatment chamber 100, a feed trough 101 at the top of the treatment chamber 100, a partition plate 102 inside the treatment chamber 100 dividing the interior of the treatment chamber 100 into a dewatering zone 103 and a discharge zone 104, and a discharge port 105 at the bottom of the treatment chamber 100. It also includes:

[0036] Multiple dewatering mechanisms 200 are evenly installed on the processing chamber 100. Each dewatering mechanism 200 includes a feed pipe 210, a filter bag 220, and a discharge pipe 230 arranged coaxially. The filter bag 220 is disposed inside the dewatering zone 103. The top end of the feed pipe 210 passes through the bottom plate of the feed trough 101 and is fixedly connected to the bottom plate of the feed trough 101. The bottom end of the feed pipe 210 extends to the dewatering zone 103 and communicates with the inside of the filter bag 220. The bottom end of the filter bag 220 communicates with the inside of the discharge pipe 230. The bottom end of the discharge pipe 230 extends into the discharge zone 104.

[0037] Multiple drive mechanisms 300 are installed inside the processing chamber 100. Each drive mechanism 300 corresponds to a dewatering mechanism 200. Each drive mechanism 300 includes a rotary drive assembly 310, a moving drive assembly 320, and two constraint components 330. The two constraint components 330 are respectively disposed at the upper and lower ends of the filter bag 220 corresponding to them. The constraint components 330 are used to bind the filter bag 200.

[0038] The rotary drive assembly 310 is used to drive the bottom constraint member 330 to rotate around the axis of the filter bag 220, and the movable drive assembly 320 is used to drive the bottom constraint member 330 to move along the axial direction of the filter bag 220.

[0039] Multiple auxiliary mechanisms 400 correspond one-to-one with multiple dewatering mechanisms 200. Each auxiliary mechanism 400 includes an upper extruder 410, a lower extruder 420, and an auxiliary drive assembly. The top end of the upper extruder 410 is fixedly connected to the processing chamber 100, and the bottom end of the upper extruder 410 extends into the interior of the corresponding filter bag 220. A sliding cavity is provided inside the bottom end of the upper extruder 410. The outer wall of the lower extruder 420 is slidably connected to the inner wall of the sliding cavity. One side of the lower extruder 420 is connected to the auxiliary drive assembly, which can drive the lower extruder 420 to move relative to the upper extruder 410 along the axial direction of the filter bag 220.

[0040] Specifically, the bottom end of the filter bag 220 is tightened by the constraint member 330 located at the bottom to prevent the sludge entering the filter bag 220 from being discharged directly from the discharge pipe 230 without dewatering. The sludge is then transported to the feed trough 101 at the top of the treatment chamber 100. The sludge enters the filter bag 220 from the feed pipe 210, and the top end of the filter bag 220 is tightened by multiple tightening members 331 in the top constraint member 330. At this time, the bottom constraint member 330 is driven to rotate around the axis of the filter bag 220 by the rotation drive assembly 310, and the bottom constraint member 330 is driven to move upward along the axial direction of the filter bag 220 by the movement drive assembly 320. The bottom constraint component 330 moves the filter bag 220 upward and rotates the bottom end of the filter bag 220. The filter bag 220 twists and squeezes the sludge inside to squeeze out the water. The squeezed water enters the dewatering zone 103. Since the bottom constraint component 330 moves the bottom end of the filter bag 220 upward, it can prevent the filter bag 220 from being pulled and broken during twisting, thus effectively dewatering the sludge. After dewatering, the bottom constraint component 330 is driven to rotate in the opposite direction around the axis of the filter bag 220 by the rotation drive component 310. The dewatered sludge is discharged from the discharge port 105 to the discharge zone 104 and discharged from the discharge port 105.

[0041] Although the filter bag 220 can dewater the sludge to a certain extent when it is twisted, the dewatering effect on the sludge located in the center of the filter bag 220 is insufficient due to the fixed diameter of the filter bag 220. Therefore, after the sludge enters the filter bag 220, the auxiliary drive assembly drives the lower extruder 420 to move downward. The lower extruder 420 assists in extruding the sludge, and the mechanical pressing enhances the sludge dewatering effect. Furthermore, the upper extruder 410 and the lower extruder 420 are located in the center of the filter bag 220, which can disperse the sludge to a certain extent, so as to avoid poor dewatering effect of the sludge located in the center.

[0042] In one embodiment of the present invention, the constraint component 330 includes a constraint driving assembly and a plurality of knotting members 331. The plurality of knotting members 331 are arranged in a circumferential array with the axis of the filter bag 220 as the center. One side of each of the plurality of knotting members 331 is connected to the constraint driving assembly. The constraint driving assembly is used to drive the plurality of knotting members 331 to move radially along the filter bag 220.

[0043] Specifically, the constraint drive assembly in the constraint component 330 at the bottom drives multiple clamping members 331 to move radially along the filter bag 220. The multiple clamping members 331 move to clamp the bottom of the filter bag 220 to prevent the sludge that has entered the filter bag 220 from being discharged directly from the discharge pipe 230 without being dewatered.

[0044] In one embodiment of the present invention, the constraint drive assembly includes a fixed shell 332. A plurality of racks 333 are slidably mounted on the inner wall of the fixed shell 332. The plurality of racks 333 correspond one-to-one with a plurality of clamping members 331. One end of the plurality of racks 333 is fixedly connected to its corresponding clamping member 331. A B gear 334 is meshed on one side of each of the plurality of racks 333. The same internal gear ring 335 is meshed on one side of each of the plurality of B gears 334. One side of the internal gear ring 335 is rotatably connected to the inner wall of the fixed shell 332. A rotating shaft 336 is fixedly sleeved inside each of the plurality of B gears 334. One end of each of the plurality of rotating shafts 336 is rotatably connected to the fixed shell 332. The other end of one of the rotating shafts 336 is connected to an A rotary drive member 337 for driving it to rotate around its own axis. The A rotary drive member 337 is a rotary cylinder or a motor.

[0045] The upper surface of the fixed shell 332 in the top constraint member 330 is fixedly connected to the lower surface of the feed trough 101 via a bracket;

[0046] Specifically, the A rotary drive 337 drives the shaft 336 to rotate the B gear 334. The B gear 334 meshes with the internal gear ring 335, which in turn drives the internal gear ring 335 to rotate. The internal gear ring 335 then drives the remaining multiple B gears 334 to rotate, thereby enabling multiple racks 333 to move radially synchronously. This controls the tightening or loosening of the filter bag 220 port by the mouth-binding member 331. The fixed shell 332 of the top constraint member 330 is fixed to the bottom plate of the feed trough 101 by a bracket, while the bottom constraint member 330 is movable.

[0047] In one embodiment of the present invention, the moving drive assembly 320 includes a turntable 321 and two A telescopic drive members 322. The turntable 321 is rotatably mounted on the partition plate 102. The outer side wall of the discharge pipe 230 is movably connected to the turntable 321 corresponding to it. The moving ends of the two A telescopic drive members 322 respectively pass through the turntable 321 and are fixedly connected to the fixed shell 332 inside the constraint member 330 located at the bottom. The fixed ends of the two A telescopic drive members 322 are fixedly connected to the turntable 321 respectively. The A telescopic drive members 322 are hydraulic cylinders or electric telescopic rods.

[0048] Specifically, the two A telescopic drive components 322 push the fixed shell 332 of the bottom constraint component 330 to move along the axial direction of the filter bag 220, causing the bottom of the filter bag 220 to rise or fall. The turntable 321 is movably connected to the discharge pipe 230, and the discharge pipe 230 can rotate or move up and down relative to the turntable 321. A sealing ring is provided between the turntable 321 and the discharge pipe 230.

[0049] In one embodiment of the present invention, the rotary drive assembly 310 includes an external gear ring 311, an A gear 312, and a B rotary drive component 313. The B rotary drive component 313 is a motor or a rotary cylinder. The A gear 312 is fixedly sleeved outside the output shaft of the B rotary drive component 313. The B rotary drive component 313 is fixedly installed at the bottom of the partition plate 102. One side of the A gear 312 meshes with the external gear ring 311. The external gear ring 311 is fixedly sleeved outside the turntable 321.

[0050] Specifically, the B rotary drive component 313 drives the A gear 312 to rotate, the A gear 312 drives the turntable 321 to rotate through the external gear ring 311, and the turntable 321 drives the bottom of the filter bag 220 to rotate through the moving drive component 320, thereby realizing the twisting and squeezing of the sludge inside the filter bag 220.

[0051] In one embodiment of the present invention, the auxiliary drive assembly includes a sleeve 430 and a cylindrical groove 450 formed on the lower extruder 420. The top end of the sleeve 430 is rotatably connected to the upper extruder 410. A drive rod 440 is slidably connected inside the sleeve 430. A push rod 460 is fixedly installed on the outer wall of the bottom end of the sleeve 430. A spiral groove 470 is formed on the inner wall of the cylindrical groove 450. The outer wall of the push rod 460 is slidably connected to the inner wall of the spiral groove 470. A spring 480 is provided between the sleeve 430 and the drive rod 440 to facilitate the reset of the drive rod 440. The two ends of the spring 480 are fixedly connected to the sleeve 430 and the drive rod 440 respectively.

[0052] Specifically, after multiple binding members 331 move radially along the filter bag 220, they shrink the filter bag 220. After binding the filter bag 220, the binding members 331 clamp the bottom end of the drive rod 440. Thus, when the constraint member 330 at the bottom rotates, it synchronously drives the drive rod 440 to rotate. The drive rod 440 drives the sleeve 430 to rotate. The push rod 460 on the sleeve 430 pushes against the inner wall of the spiral groove 470, thereby driving the lower extrusion member 420 to move down, so as to achieve mechanical pressing to enhance the sludge dewatering effect.

[0053] In one embodiment of the invention, the bottom end of the drive rod 440 is covered with a friction pad 441 to enhance friction and prevent excessive compression from damaging the filter bag 220.

[0054] In one embodiment of the present invention, please refer to Figure 9 The auxiliary drive component can also be a B telescopic drive component 490. The B telescopic drive component 490 adopts a telescopic cylinder or a hydraulic cylinder. The fixed end of the B telescopic drive component 490 is fixedly connected to the upper extrusion component 410, and the moving end of the B telescopic drive component 490 is fixedly connected to the lower extrusion component 420.

[0055] Specifically, the lower extrusion member 420 moves up and down by extending and retracting the moving end of the B telescopic drive member 490, thereby achieving enhanced sludge dewatering effect through mechanical pressing.

[0056] In one embodiment of the present invention, a corresponding control unit can be set up for cooperative use. This control unit can be any type of controller connected to the electrical components in this application, thereby controlling the start-up and shutdown of each electrical component. This part is prior art. Here, a microcontroller can be provided as the control unit for demonstration. In this embodiment, the microcontroller is a typical embedded microcontroller unit, consisting of an arithmetic logic unit (ALU), a controller, a memory, input / output devices, etc., equivalent to a miniature computer. Compared with the general-purpose microprocessors used in personal computers, it emphasizes self-sufficiency (no external hardware required) and cost savings. Its biggest advantage is its small size, which can be placed inside the instrument, but it has small storage capacity, simple input / output interfaces, and low power consumption.

[0057] The above description is a further detailed explanation of the present invention in conjunction with specific preferred embodiments. It should not be considered that the specific embodiments of the present invention are limited to this. For those skilled in the art, several simple deductions or substitutions can be made without departing from the present invention, and all of these should be considered to fall within the scope of patent protection determined by the submitted claims.

Claims

1. A sludge dewatering device for wastewater treatment, characterized in that, The system includes a dewatering mechanism (200), a driving mechanism (300), and an auxiliary mechanism (400). The dewatering mechanism (200) includes a feed pipe (210), a filter bag (220), and a discharge pipe (230) connected in sequence. The driving mechanism (300) includes a rotary driving assembly (310), a moving driving assembly (320), and two constraint components (330). The two constraint components (330) are respectively disposed at the upper and lower ends of the filter bag (220), and the constraint components (330) are used to bind the filter bag (220). The rotary driving assembly (310) is used to drive the constraint component (330) located at the bottom to rotate around the axis of the filter bag (220), and the moving driving assembly (320) is used to drive the constraint component (330) located at the bottom to move along the axial direction of the filter bag (220). The auxiliary mechanism (400) includes an upper extruder (410), a lower extruder (420), and an auxiliary drive assembly. The bottom end of the upper extruder (410) extends into the interior of the filter bag (220). A sliding cavity is provided inside the bottom end of the upper extruder (410). The outer wall of the lower extruder (420) is slidably connected to the inner wall of the sliding cavity. One side of the lower extruder (420) is connected to the auxiliary drive assembly. The auxiliary drive assembly drives the lower extruder (420) to move relative to the upper extruder (410) along the axial direction of the filter bag (220).

2. The sludge dewatering device for wastewater treatment according to claim 1, characterized in that, The constraint component (330) includes a constraint drive assembly and multiple sag members (331). The multiple sag members (331) are arranged in a circumferential array with the axis of the filter bag (220) as the center. One side of each of the multiple sag members (331) is connected to the constraint drive assembly. The constraint drive assembly is used to drive the multiple sag members (331) to move radially along the filter bag (220).

3. The sludge dewatering device for wastewater treatment according to claim 2, characterized in that, The constraint drive assembly includes a fixed shell (332), on which multiple racks (333) are slidably mounted. Each rack (333) corresponds to a multiple clamping member (331). One end of each rack (333) is fixedly connected to its corresponding clamping member (331). Each rack (333) has a B gear (334) meshing on one side. Each B gear (334) has the same internal gear ring (335) meshing on one side. One side of the internal gear ring (335) is rotatably connected to the inner wall of the fixed shell (332). Each B gear (334) has a rotating shaft (336) fixedly fitted inside. One end of each rotating shaft (336) is rotatably connected to the fixed shell (332). The other end of one of the rotating shafts (336) is connected to an A rotary drive member (337) for driving it to rotate around its own axis.

4. The sludge dewatering device for wastewater treatment according to claim 3, characterized in that, The moving drive assembly (320) includes a turntable (321) and two A telescopic drive members (322). The outer wall of the discharge pipe (230) is movably connected to the turntable (321). The moving ends of the two A telescopic drive members (322) pass through the turntable (321) and are fixedly connected to the fixed shell (332) inside the constraint member (330) at the bottom. The fixed ends of the two A telescopic drive members (322) are fixedly connected to the turntable (321).

5. A sludge dewatering device for wastewater treatment according to claim 4, characterized in that, The rotary drive assembly (310) includes an external gear ring (311), an A gear (312), and a B rotary drive component (313). The A gear (312) is fixedly sleeved on the outside of the output shaft of the B rotary drive component (313). One side of the A gear (312) meshes with the external gear ring (311), and the external gear ring (311) is fixedly sleeved on the outside of the turntable (321).

6. The sludge dewatering device for wastewater treatment according to claim 1, characterized in that, The auxiliary drive assembly includes a sleeve (430) and a cylindrical groove (450) formed on the lower extruder (420). The top end of the sleeve (430) is rotatably connected to the upper extruder (410). A drive rod (440) is slidably connected inside the sleeve (430). A push rod (460) is fixedly installed on the outer wall of the bottom end of the sleeve (430). A spiral groove (470) is formed on the inner wall of the cylindrical groove (450). The outer wall of the push rod (460) is slidably connected to the inner wall of the spiral groove (470). A spring (480) is provided between the sleeve (430) and the drive rod (440). The two ends of the spring (480) are fixedly connected to the sleeve (430) and the drive rod (440) respectively.

7. A sludge dewatering device for wastewater treatment according to claim 6, characterized in that, The bottom end of the drive rod (440) is covered with a friction pad (441).

8. A sludge dewatering device for wastewater treatment according to claim 1, characterized in that, The auxiliary drive component is a B telescopic drive member (490). The fixed end of the B telescopic drive member (490) is fixedly connected to the upper extrusion member (410), and the moving end of the B telescopic drive member (490) is fixedly connected to the lower extrusion member (420).

9. A sludge dewatering device for wastewater treatment according to any one of claims 1-8, characterized in that, It also includes a processing chamber (100), the top of which is provided with a feed trough (101), and the interior of the processing chamber (100) is provided with a partition plate (102), which divides the interior of the processing chamber (100) into a dehydration zone (103) and a discharge zone (104); a filter bag (220) is provided inside the dehydration zone (103), the top end of the feed pipe (210) passes through the bottom plate of the feed trough (101) and is fixedly connected to the bottom plate of the feed trough (101), and the bottom end of the discharge pipe (230) extends into the discharge zone (104).

10. A sludge dewatering device for wastewater treatment according to claim 9, characterized in that, Multiple sets of corresponding dehydration mechanisms (200), drive mechanisms (300) and auxiliary mechanisms (400) are evenly installed inside the processing chamber (100).

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