A device for dewatering and treating water supply and drainage sludge

Abstract

The present invention relates to the field of water supply and drainage sludge dewatering treatment, and discloses a water supply and drainage sludge dewatering treatment device, which includes a rectangular sludge tank. One end of the rectangular sludge tank is fixedly connected with a dehydration tank. A leaky conveyor belt is installed in the middle of the rectangular sludge tank. One end of the leaky conveyor belt is fixed at the bottom inside the rectangular sludge tank, and the other end of the leaky conveyor belt is placed above the dehydration tank. A rotary dehydration assembly is installed on the right side inside the dehydration tank, and a sludge secondary dehydration and discharging assembly is installed on the left side of the rotary dehydration assembly. Compared with the prior art, the present application can perform three-stage dehydration treatment on sludge, and the entire dehydration process is continuous, with good dehydration effect and a huge increase in the sludge treatment capacity.

Description

Technical Field

[0001] The present invention relates to the field of water supply and drainage sludge dewatering treatment, and specifically to a water supply and drainage sludge dewatering treatment device. Background Art

[0002] The major of water supply and drainage engineering is one of the engineering disciplines, abbreviated as water supply and drainage. Generally, water supply and drainage science and engineering refer to the urban water supply system and drainage system (municipal water supply and drainage and building water supply and drainage), abbreviated as water supply and drainage. The study of water supply and drainage engineering focuses on the social cycle of water. In drainage engineering, since sludge is often mixed in sewage to form sludge, the sludge is generally in a fluid state before treatment and contains a large amount of sewage, and the sewage contains a large amount of toxic components. Random discharge will cause environmental pollution. Therefore, during sludge treatment, the sludge will be disinfected, the sewage in the sludge will be separated, and the sludge will be turned into a solid state to facilitate the subsequent treatment of the sludge and further reduce environmental pollution.

[0003] After retrieval, it is found that the prior art publication number is CN108623111B, which discloses a sludge dewatering device for water supply and drainage, including a support frame, a disinfection mechanism, a dewatering mechanism and a discharging mechanism. The dewatering mechanism includes a dewatering tank, a squeezing member, a cloth bag and a hydraulic cylinder. The discharging mechanism includes a sewage passage and a sludge passage; both the dewatering tank and the squeezing member are in a pot shape, and the outer surface of the squeezing member is adapted to the inner surface of the dewatering tank. The squeezing member is located directly above the dewatering tank, the cloth bag is suspended on the squeezing member, and the upper port of the cloth bag is installed on the circumference of the upper part of the bottom surface of the squeezing member.

[0004] Therefore, based on the above retrieval and combined with the existing sludge dewatering treatment equipment, the sludge is wrapped by a cloth bag, and then the cloth bag wrapped with the sludge is squeezed to squeeze out the sewage in the sludge, and then the sludge wrapped by the cloth bag is discharged. Then, the sludge is wrapped by the cloth bag for dewatering treatment. In the above process, not only the dewatering method of the sludge is single and the dewatering effect is poor, but also the sludge treatment capacity is very limited and the efficiency is extremely low during the whole process. Therefore, in view of the above problems, the present invention provides a water supply and drainage sludge dewatering treatment device. Summary of the Invention

[0005] Aiming at the deficiencies of the prior art, the present invention provides a water supply and drainage sludge dewatering treatment device, which has the advantages of continuous high efficiency, etc., and solves a series of problems such as single dewatering method and low efficiency.

[0006] To achieve the above object, the present invention provides the following technical solution: a water supply and drainage sludge dewatering treatment device, including a rectangular sludge tank, one end of the rectangular sludge tank is fixedly connected with a dewatering tank, a leaky conveyor belt is installed in the middle of the rectangular sludge tank, one end of the leaky conveyor belt is fixed at the bottom of the rectangular sludge tank, the other end of the leaky conveyor belt is placed above the dewatering tank, a rotary dewatering component is installed on the right side in the dewatering tank, a sludge secondary dewatering and discharging component is installed on the left side of the rotary dewatering component, a first sewage discharge port is connected to the lower side of the side wall of the rectangular sludge tank, a second sewage discharge port is connected to the lower side of the side wall of the dewatering tank, a partition board is fixedly arranged in the rectangular sludge tank, and the partition board is located below the leaky conveyor belt.

[0007] Preferably, the leaky conveyor belt is a chain plate conveyor belt, sludge baffles are fixedly connected to both sides of the leaky conveyor belt, a plurality of fixing plates are installed on the leaky conveyor belt, an arc-shaped dredging grab plate is integrally connected to the outer end of each fixing plate, and the multiple fixing plates on the leaky conveyor belt are evenly distributed along the conveyor belt.

[0008] Preferably, the rotary dewatering component includes side plates fixedly arranged on the front and rear side walls in the dewatering tank, a rotating shaft is rotatably connected between the two side plates, a first motor is installed on the outer side wall of the dewatering tank, an output end of the first motor is fixedly connected to the rotating shaft, a plurality of circulating dewatering components are installed on the outer surface of the rotating shaft, there are three groups of the circulating dewatering components, and the three groups of the circulating dewatering components are evenly distributed on the outer surface of the rotating shaft.

[0009] Preferably, the sludge secondary dewatering and discharging component includes a receiving hopper fixed on the bottom side wall in the dewatering tank, a discharging and dewatering cylinder is fixedly connected to the lower end of the receiving hopper, the outer end of the discharging and dewatering cylinder extends out of the dewatering tank, a spiral feeding shaft is rotatably installed in the receiving hopper, a third motor is installed on the outer side wall of the dewatering tank, and an output end of the third motor is fixedly connected to the spiral feeding shaft.

[0010] Preferably, the circulating dewatering component includes a fixed frame fixedly connected to the outer surface of the rotating shaft, a rotating frame is rotatably connected to one end of the fixed frame close to the rotating shaft, a rubber sheet is connected to the surface of the rotating frame, a bottom dewatering gauze is arranged in the middle of the inner bottom of the fixed frame, side dewatering mesh plates are arranged on both side walls of the fixed frame, a transmission shaft is fixedly penetrated through the lower end of the rotating frame, both ends of the transmission shaft extend out of the fixed frame and are fixedly connected with transmission gears, semi-gears are fixedly connected to the opposite side end faces of the two side plates, the semi-gears are sleeved on the periphery of the rotating shaft, the transmission gears are meshed with the semi-gears, and a plurality of reset springs are connected between the back surface of the rotating frame and the upper end surface of the fixed frame.

[0011] Preferably, three dehydration pressure rollers are rotatably installed between the rotating frame and the rubber sheet. A first transmission belt is connected between the central axes of the upper dehydration pressure roller and the middle dehydration pressure roller, and a second transmission belt is connected between the central axes of the middle dehydration pressure roller and the lower dehydration pressure roller. A second motor is installed on the back of the rotating frame, and a third transmission belt is connected between the output end of the second motor and the central axis of the lower dehydration pressure roller. The three dehydration pressure rollers between the rotating frame and the rubber sheet are distributed in a triangle, and dehydration pressing plates are symmetrically and integrally connected to the outer surface of the dehydration pressure rollers.

[0012] Preferably, a pull rope is connected between the center of the rubber sheet and the center of the bottom dehydration gauze.

[0013] Preferably, the discharge dehydration cylinder is a conical cylinder. The diameter of the end of the discharge dehydration cylinder extending outside the dehydration tank is smaller than the diameter of the end where the discharge dehydration cylinder is connected to the material receiving hopper. The spiral feeding shaft is a conical spiral rod, and the discharge dehydration cylinder is a mesh cylinder.

[0014] Preferably, a sludge baffle is fixedly arranged at the connection between the rectangular sludge tank and the dehydration tank.

[0015] Compared with the prior art, the present invention provides a water supply and drainage sludge dewatering treatment device, which has the following beneficial effects:

[0016] 1. For this water supply and drainage sludge dewatering treatment device, the sludge transported on the leaky conveyor belt will automatically filter out the water in the sludge under the conditions of gravity and chain plate filtration during the transportation process. Before the sludge transported by the leaky conveyor belt falls into the dehydration tank, it is initially dehydrated, realizing the continuous transportation of the sludge and preliminary dehydration during the transportation process.

[0017] 2. For this water supply and drainage sludge dewatering treatment device, the second motor drives the three dehydration pressure rollers in the rotating frame to rotate by itself through the third transmission belt. The dehydration pressing plates on the surface of the dehydration pressure rollers continuously squeeze the sludge repeatedly, improving the dehydration effect of the sludge. This dehydration process continues until the teeth on the surface of the transmission gear and the half gear are separated. At this time, the transmission gear loses the limit of the teeth on the surface of the half gear, and under the action of the return spring, the rotating frame rotates and resets itself. And at this time, the entire circulating dehydration assembly has rotated to the upper part of the sludge secondary dehydration and discharging assembly along with the rotating shaft. As shown in Figure 4 the figure, the state of the circulating dehydration assembly moving to the upper part of the sludge secondary dehydration and discharging assembly is that the opening of the fixed frame faces downward. Therefore, through the three circulating dehydration assemblies on the outer surface of the rotating shaft, continuous dehydration operation of the sludge can be realized, and the dehydration effect is excellent.

[0018] 3. For this sewage and drainage sludge dewatering treatment device, after the sludge is initially dewatered by the rotary dewatering component, it falls from the fixed frame into the receiving hopper. Then, turn on the third motor, which drives the spiral feeding shaft at the bottom of the receiving hopper to rotate. The rotating spiral feeding shaft pushes the sludge to be transported along the discharging and dewatering cylinder. Since the spiral feeding shaft and the discharging and dewatering cylinder around it are in a conical structure, during the transportation of the sludge falling into the spiral feeding shaft by the spiral feeding shaft, the sludge is continuously squeezed to achieve secondary dewatering. The removed sewage passes through the discharging and dewatering cylinder and is discharged into the bottom of the dewatering tank. Finally, the sludge that has undergone three - stage dewatering is finally discharged from the end of the discharging and dewatering cylinder, realizing excellent continuous dewatering operation of the sludge. Brief Description of the Drawings

[0019] Figure 1 Isometric three - dimensional structure schematic diagram of the present invention;

[0020] Figure 2 Stereo structure schematic diagram of the arc - shaped dredging grab plate of the present invention;

[0021] Figure 3 Internal structure schematic diagram of the dewatering tank of the present invention;

[0022] Figure 4 Stereo structure schematic diagram of the rotary dewatering component of the present invention;

[0023] Figure 5 Front - view stereo structure schematic diagram of the circulating dewatering component of the present invention;

[0024] Figure 6 Rear - view stereo structure schematic diagram of the circulating dewatering component of the present invention;

[0025] Figure 7 Schematic diagram of the installation structure of the semi - gear of the present invention;

[0026] Figure 8 Stereo structure schematic diagram of the sludge secondary dewatering and discharging component of the present invention;

[0027] Figure 9 Schematic diagram of the structure of the spiral feeding shaft of the present invention.

[0028] In the figure: 1. rectangular sludge tank; 2. water leakage conveyor belt; 3. dehydration tank; 4. rotary dehydration component; 5. fixed plate; 6. arc dredging grab plate; 7. sludge baffle; 8. sludge secondary dehydration discharge component; 9. first motor; 10. side plate; 11. rotating shaft; 12. circulating dehydration component; 13. pull rope; 14. bottom dehydration gauze; 15. fixed frame; 16. side dehydration screen plate; 17. transmission gear; 18. transmission shaft; 19. rubber strip; 20. rotating frame; 21. dehydration pressing plate; 22. dehydration pressing roller; 23. first transmission belt; 24. second transmission belt; 25. third transmission belt; 26. second motor; 27. return spring; 28. half gear; 29. discharge dehydration cylinder; 30. receiving hopper; 31. spiral feeding shaft; 32. third motor; 33. first sewage outlet; 34. second sewage outlet; 35. partition board. Detailed implementation mode

[0029] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0030] As introduced in the background art, there are deficiencies in the prior art. To solve the above technical problems, the present application proposes a water supply and drainage sludge dehydration treatment device.

[0031] In a typical implementation mode of the present application, as Figures 1-9As shown in the figure, a water supply and drainage sludge dewatering treatment device includes a rectangular sludge tank 1. One end of the rectangular sludge tank 1 is fixedly connected to a dewatering tank 3. In the middle of the rectangular sludge tank 1, a leaky conveyor belt 2 is installed. One end of the leaky conveyor belt 2 is fixed at the bottom inside the rectangular sludge tank 1, and the other end of the leaky conveyor belt 2 is placed above the dewatering tank 3. On the right side inside the dewatering tank 3, a rotary dewatering component 4 is installed. On the left side of the rotary dewatering component 4, a sludge secondary dewatering and discharging component 8 is installed. Below the side wall of the rectangular sludge tank 1, a first sewage outlet 33 is connected. Below the side wall of the dewatering tank 3, a second sewage outlet 34 is connected. Inside the rectangular sludge tank 1, a partition plate 35 is fixedly arranged. The partition plate 35 is located below the leaky conveyor belt 2. The leaky conveyor belt 2 is a chain plate conveyor belt. On both sides of the leaky conveyor belt 2, sludge baffles are fixedly connected. On the leaky conveyor belt 2, a number of fixing plates 5 are installed. At the outer end of each fixing plate 5, an arc-shaped dredging grab plate 6 is integrally connected. The multiple fixing plates 5 on the leaky conveyor belt 2 are evenly distributed along the conveyor belt. The rotary dewatering component 4 includes side plates 10 fixedly arranged on the front and rear side walls inside the dewatering tank 3. Between the two side plates 10, a rotating shaft 11 is rotatably connected. On the outer side wall of the dewatering tank 3, a first motor 9 is installed. The output end of the first motor 9 is fixedly connected to the rotating shaft 11. On the outer surface of the rotating shaft 11, a number of circulating dewatering components 12 are installed. There are three groups of circulating dewatering components 12, and the three groups of circulating dewatering components 12 are evenly distributed on the outer surface of the rotating shaft 11. The circulating dewatering component 12 includes a fixed frame 15 fixedly connected to the outer surface of the rotating shaft 11. At one end of the fixed frame 15 close to the rotating shaft 11, a rotating frame 20 is rotatably connected. On the surface of the rotating frame 20, a rubber strip 19 is connected. In the middle of the bottom inside the fixed frame 15, a bottom dewatering gauze 14 is arranged. On both side walls of the fixed frame 15, side dewatering mesh plates 16 are arranged. At the lower end of the rotating frame 20, a transmission shaft 18 is fixedly penetrated. The two ends of the transmission shaft 18 extend out of the fixed frame 15 and are fixedly connected to transmission gears 17. On the opposite side end faces of the two side plates 10, a half gear 28 is fixedly connected. The half gear 28 is sleeved around the rotating shaft 11. The transmission gear 17 and the half gear 28 are meshed. Between the back surface of the rotating frame 20 and the upper end surface of the fixed frame 15, a number of return springs 27 are connected. Between the rotating frame 20 and the rubber strip 19, three groups of dewatering pressure rollers 22 are rotatably installed. Between the central axes of the upper dewatering pressure roller 22 and the middle dewatering pressure roller 22, a first transmission belt 23 is connected. Between the central axes of the middle dewatering pressure roller 22 and the lower dewatering pressure roller 22, a second transmission belt 24 is connected. On the output end of the second motor 26 installed on the back surface of the rotating frame 20 and the central axis of the lower dewatering pressure roller 22, a third transmission belt 25 is connected. The three groups of dewatering pressure rollers 22 between the rotating frame 20 and the rubber strip 19 are distributed in a triangle. On the outer surface of the dewatering pressure roller 22, dewatering pressure plates 21 are symmetrically integrally connected. The rectangular sludge tank 1 is used to place the sludge to be dewatered.

[0032] During specific operation, sludge is poured into the rectangular sludge tank 1. When the water-leaking conveyor belt 2 is in operation, a number of fixed plates 5 and arc-shaped dredging grab plates 6 connected to its surface will rotate along with the water-leaking conveyor belt 2. During the rotation process, the sludge in the rectangular sludge tank 1 is carried out by the fixed plates 5 and the arc-shaped dredging grab plates 6. Since the water-leaking conveyor belt 2 is a chain plate conveyor belt, therefore, the water in the sludge will be automatically filtered out under the conditions of gravity and chain plate filtration during the transportation of the sludge on the water-leaking conveyor belt 2. Before the sludge transported along with the water-leaking conveyor belt 2 falls into the dehydration tank 3, it is initially dehydrated, and the dehydrated water flows into the left side of the partition plate 35 in the rectangular sludge tank 1 and is discharged from the first sewage outlet 33.

[0033] In the present invention, the fixed plate 5 does not necessarily need to be arranged perpendicular to the water-leaking conveyor belt 2, and it can also be arranged obliquely at a certain angle. When the water-leaking conveyor belt 2 drives the fixed plate 5 to convey obliquely upward from the rectangular sludge tank 1, the sludge carried by the fixed plate 5 and the arc-shaped dredging grab plate 6 will not completely fall on the water-leaking conveyor belt 2. When the water-leaking conveyor belt 2 drives the fixed plate 5 to move horizontally towards the dehydration tank 3 at the highest point, the sludge will completely fall on the water-leaking conveyor belt 2. In this way, the water initially filtered out from the sludge on the water-leaking conveyor belt 2 will pass through the water-leaking conveyor belt 2 and fall into the left side of the partition plate 35 (refer to Figure 1 ) and will not return to the right side of the partition plate 35 (refer to Figure 1 ) and mix with the sludge.

[0034] For the sludge transported along with the water-leaking conveyor belt 2, when it is transported at the end of the water-leaking conveyor belt 2, the fixed plates 5 and the arc-shaped dredging grab plates 6 at the end of the water-leaking conveyor belt 2 are both inverted downward. Under the action of gravity, the sludge carried by the fixed plates 5 and the arc-shaped dredging grab plates 6 falls and lands in the fixed frame 15 in the circulating dehydration assembly 12. The bottom dehydration gauze 14 between the fixed frames 15 will hold the sludge. At this time, the first motor 9 outside the dehydration tank 3 is turned on, and the first motor 9 drives the rotating shaft 11 and the fixed frame 15 on its outer surface to rotate upward, as shown in Figure 5 、 6As shown in FIGS. 7, the rotating frame 20 connected to the fixed frame 15 rotates synchronously. The rotation axis of the rotating frame 20 rotates synchronously with the transmission shaft 18, and the transmission gear 17 at the end of the transmission shaft 18 rotates synchronously. During the rotation of the transmission gear 17, it meshes with several tooth openings in the half gear 28 fixed on the side plate 10. Since the half gear 28 remains fixed while the transmission gear 17 rotates with the rotating shaft 11, the transmission gear 17 itself rotates under the action of the half gear 28, and the transmission shaft 18 and the rotating frame 20 connected to the transmission gear 17 rotate themselves. The rotating frame 20 rotates towards the fixed frame 15. The rubber strips 19 connected to the surface of the rotating frame 20 gradually contact the sludge on the bottom dewatering gauze 14 as the rotating frame 20 rotates. Several dewatering rollers 22 in the rubber strips 19 press down on the sludge on the bottom dewatering gauze 14 and squeeze out the water in the sludge. The squeezed-out water passes through the bottom dewatering gauze 14 and the side dewatering mesh plate 16 and flows into the bottom of the dewatering tank 3, and finally is discharged.

[0035] In the above process, when the second motor 26 is turned on, the second motor 26 drives the three groups of dewatering rollers 22 in the rotating frame 20 to rotate themselves through the third transmission belt 25. The dewatering plates 21 on the surface of the dewatering rollers 22 continuously squeeze the sludge repeatedly to improve the dewatering effect of the sludge. The above dewatering process continues until the tooth openings on the surfaces of the transmission gear 17 and the half gear 28 are separated. At this time, without the limit of the tooth openings on the surface of the half gear 28 and under the action of the return spring 27, the rotating frame 20 rotates and resets itself, and at this time, the entire circulating dewatering assembly 12 has rotated to the upper part of the sludge secondary dewatering and discharging assembly 8 along with the rotating shaft 11, as Figure 4 shown. The state of the circulating dewatering assembly 12 moving to the upper part of the sludge secondary dewatering and discharging assembly 8 is that the opening of the fixed frame 15 faces downward. In summary, through the three groups of circulating dewatering assemblies 12 on the outer surface of the rotating shaft 11, continuous dewatering operation of the sludge can be realized, and the dewatering effect is good.

[0036] It should be noted that whenever the arc-shaped dredging grab plate 6 on the surface of the water leakage conveyor belt 2 conveys the sludge to the end of the water leakage conveyor belt 2, at this time, exactly one of the fixed frames 15 in a group of circulating dewatering assemblies 12 on the outer surface of the rotating shaft 11 has an upward opening and can catch the sludge falling from the water leakage conveyor belt 2.

[0037] As a preferred implementation mode in this embodiment, the sludge secondary dehydration discharging assembly 8 includes a receiving hopper 30 fixed on the inner bottom side wall of the dehydration tank 3. The lower end of the receiving hopper 30 is fixedly connected with a discharging dehydration cylinder 29. The outer end of the discharging dehydration cylinder 29 extends outside the dehydration tank 3. A spiral feeding shaft 31 is rotatably installed in the receiving hopper 30. A third motor 32 is installed on the outer side wall of the dehydration tank 3. The output end of the third motor 32 is fixedly connected with the spiral feeding shaft 31. The discharging dehydration cylinder 29 is a conical cylinder. The diameter of the end of the discharging dehydration cylinder 29 extending outside the dehydration tank 3 is smaller than the diameter of the end where the discharging dehydration cylinder 29 is connected with the receiving hopper 30. The spiral feeding shaft 31 is a conical spiral rod, and the discharging dehydration cylinder 29 is a mesh cylinder.

[0038] After the sludge is initially dehydrated by the rotary dehydration assembly 4, it falls from the fixed frame 15 into the receiving hopper 30. The third motor 32 is turned on. The third motor 32 drives the spiral feeding shaft 31 at the inner bottom of the receiving hopper 30 to rotate. The sludge is pushed along the discharging dehydration cylinder 29 by the rotating spiral feeding shaft 31. Because the spiral feeding shaft 31 and the discharging dehydration cylinder 29 around it are of a conical structure, therefore, the sludge falling into the spiral feeding shaft 31 is continuously squeezed during the conveying process by the spiral feeding shaft 31, realizing secondary dehydration. The removed sewage passes through the discharging dehydration cylinder 29 and is discharged into the inner bottom of the dehydration tank 3. Finally, the sludge that has been dehydrated twice is finally discharged from the end of the discharging dehydration cylinder 29, further improving the sludge dehydration effect.

[0039] As a preferred implementation mode in this embodiment, a pull rope 13 is connected between the center of the rubber strip 19 and the center of the bottom dehydration gauze 14. Because the bottom dehydration gauze 14 is squeezed during the sludge dehydration process, after the dehydration is completed, the fixed frame 15 has its opening facing downwards. The bottom dehydration gauze 14 can be conveniently pulled out of the fixed frame 15 through the pull rope 13, facilitating the sludge held by the bottom dehydration gauze 14 to fall into the receiving hopper 30.

[0040] As a preferred implementation mode in this embodiment, a sludge baffle 7 is fixedly arranged at the connection between the rectangular sludge tank 1 and the dehydration tank 3. The sludge conveyed by the water leakage conveyor belt 2 falls into the dehydration tank 3 from the upper end of the water leakage conveyor belt 2. The sludge baffle 7 can ensure that the sludge falls into the dehydration tank 3.

[0041] Working principle of the present invention: During use, the rectangular sludge tank 1 is used to place the sludge to be dehydrated. Specifically, when working, the sludge is poured into the rectangular sludge tank 1. When the water-leaking conveyor belt 2 is working, a number of fixed plates 5 and arc-shaped dredging grab plates 6 connected to its surface will rotate with the water-leaking conveyor belt 2. During the rotation process, the sludge in the rectangular sludge tank 1 is carried out by the fixed plates 5 and the arc-shaped dredging grab plates 6. Since the water-leaking conveyor belt 2 is a chain plate conveyor belt, therefore, the sludge transported on the water-leaking conveyor belt 2 will automatically filter out the water in the sludge during the transportation under the conditions of gravity and chain plate filtration. Before the sludge transported with the water-leaking conveyor belt 2 falls into the dehydration tank 3, it is dehydrated for the first time, and the dehydrated water flows into the left side of the partition plate 35 in the rectangular sludge tank 1 and is discharged from the first sewage outlet 33;

[0042] When the sludge transported with the water-leaking conveyor belt 2 is transported at the end of the water-leaking conveyor belt 2, the fixed plate 5 and the arc-shaped dredging grab plate 6 at the end of the water-leaking conveyor belt 2 are both inverted downward. Under the action of gravity, the sludge carried out by the fixed plate 5 and the arc-shaped dredging grab plate 6 falls and lands in the fixed frame 15 in the circulating dehydration assembly 12. The bottom dehydration gauze 14 between the fixed frames 15 will hold the sludge. At this time, the first motor 9 outside the dehydration tank 3 is turned on, and the rotating shaft 11 and the fixed frame 15 on its outer surface are driven by the first motor 9 to rotate upward, as Figure 5 、 6As shown in FIGS. 6 and 7, the rotating frame 20 connected to the fixed frame 15 rotates synchronously. The rotation axis of the rotating frame 20 rotates synchronously with the transmission shaft 18, and the transmission gear 17 at the end of the transmission shaft 18 rotates synchronously. During the rotation of the transmission gear 17, it meshes with several tooth openings in the half gear 28 fixed on the side plate 10. Since the half gear 28 remains fixed while the transmission gear 17 rotates with the rotating shaft 11, the transmission gear 17 itself rotates under the action of the half gear 28, and the transmission shaft 18 and the rotating frame 20 connected to the transmission gear 17 rotate. The rotating frame 20 rotates towards the fixed frame 15. The rubber strips 19 connected to the surface of the rotating frame 20 gradually contact the sludge on the bottom dewatering gauze 14 as the rotating frame 20 rotates. Several dewatering rollers 22 in the rubber strips 19 press down on the sludge on the bottom dewatering gauze 14 and squeeze out the water in the sludge. The squeezed-out water passes through the bottom dewatering gauze 14 and the side dewatering mesh plate 16 and flows into the bottom of the dewatering tank 3 and is finally discharged. During the above process, the second motor 26 is turned on. The second motor 26 drives the three groups of dewatering rollers 22 in the rotating frame 20 to rotate through the third transmission belt 25. The dewatering plates 21 on the surface of the dewatering rollers 22 continuously squeeze the sludge repeatedly to improve the dewatering effect of the sludge. The above dewatering process continues until the tooth openings on the surfaces of the transmission gear 17 and the half gear 28 are separated. At this time, without the limit of the tooth openings on the surface of the half gear 28 and under the action of the return spring 27, the rotating frame 20 rotates and resets itself. And at this time, the entire circulating dewatering assembly 12 has rotated above the sludge secondary dewatering and discharging assembly 8 along with the rotating shaft 11, as Figure 4 shown. The state of the circulating dewatering assembly 12 moving above the sludge secondary dewatering and discharging assembly 8 is that the opening of the fixed frame 15 faces downward. In summary, through the three groups of circulating dewatering assemblies 12 on the outer surface of the rotating shaft 11, continuous dewatering operation of the sludge can be achieved, and the dewatering effect is good;

[0043] After the initial dewatering of the sludge by the rotating dewatering assembly 4, it falls from the fixed frame 15 into the receiving hopper 30. The third motor 32 is turned on. The third motor 32 drives the spiral feeding shaft 31 at the bottom of the receiving hopper 30 to rotate. The sludge is pushed along the discharging and dewatering cylinder 29 through the rotating spiral feeding shaft 31. Since the spiral feeding shaft 31 and the discharging and dewatering cylinder 29 around it are of a conical structure, the sludge falling into the spiral feeding shaft 31 is continuously squeezed during the transportation process by the spiral feeding shaft 31, realizing secondary dewatering. The removed sewage passes through the discharging and dewatering cylinder 29 and is discharged into the bottom of the dewatering tank 3. Finally, the sludge that has been dewatered twice is finally discharged from the end of the discharging and dewatering cylinder 29, further improving the dewatering effect of the sludge.

[0044] Although embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill 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 present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A device for dewatering and treating water supply and drainage sludge, comprising a rectangular sludge tank (1), characterized in that: One end of the rectangular sludge tank (1) is fixedly connected to a dehydration tank (3). A leaky conveyor belt (2) is installed in the middle of the rectangular sludge tank (1). One end of the leaky conveyor belt (2) is fixed at the bottom inside the rectangular sludge tank (1), and the other end of the leaky conveyor belt (2) is placed above the dehydration tank (3). A rotary dehydration assembly (4) is installed on the right side inside the dehydration tank (3), and a sludge secondary dehydration and discharging assembly (8) is installed on the left side of the rotary dehydration assembly (4). A first sewage discharge port (33) is connected to the lower part of the side wall of the rectangular sludge tank (1), and a second sewage discharge port (34) is connected to the lower part of the side wall of the dehydration tank (3). A partition plate (35) is fixedly arranged inside the rectangular sludge tank (1), and the partition plate (35) is located below the leaky conveyor belt (2). The rotary dehydration assembly (4) includes side plates (10) fixedly arranged on the front and rear side walls inside the dehydration tank (3), and a rotating shaft (11) is rotatably connected between the two side plates (10). A plurality of circulating dehydration assemblies (12) are installed on the outer surface of the rotating shaft (11). There are three groups of the circulating dehydration assemblies (12), and the three groups of the circulating dehydration assemblies (12) are evenly distributed on the outer surface of the rotating shaft (11). The circulating dehydration assembly (12) includes a fixed frame (15) fixedly connected to the outer surface of the rotating shaft (11). A rotating frame (20) is rotatably connected to one end of the fixed frame (15) close to the rotating shaft (11). A rubber sheet (19) is connected to the surface of the rotating frame (20). A bottom dehydration gauze (14) is arranged in the middle of the inner bottom of the fixed frame (15). Side dehydration mesh plates (16) are arranged on both side walls of the fixed frame (15). A transmission shaft (18) is fixedly penetrated through the lower end of the rotating frame (20). Both ends of the transmission shaft (18) extend outside the fixed frame (15) and are fixedly connected with transmission gears (17). Opposite end faces of the two side plates (10) are fixedly connected with half gears (28). The half gears (28) are sleeved on the periphery of the rotating shaft (11). The transmission gears (17) are meshed with the half gears (28). A plurality of return springs (27) are connected between the back surface of the rotating frame (20) and the upper end surface of the fixed frame (15). Three groups of dehydration pressure rollers (22) are rotatably installed between the rotating frame (20) and the rubber sheet (19). A first transmission belt (23) is connected between the central axes of the upper dehydration pressure roller (22) and the middle dehydration pressure roller (22). A second transmission belt (24) is connected between the central axes of the middle dehydration pressure roller (22) and the lower dehydration pressure roller (22). A second motor (26) is installed on the back surface of the rotating frame (20). A third transmission belt (25) is connected between the output end of the second motor (26) and the central axis of the lower dehydration pressure roller (22).

2. The water supply and drainage sludge dewatering treatment device according to claim 1, characterized in that: The leaking conveyor belt (2) is a chain plate conveyor belt. Mud baffles are fixedly connected to both sides of the leaking conveyor belt (2). A number of fixing plates (5) are installed on the leaking conveyor belt (2). An arc-shaped dredging grab plate (6) is integrally connected to the outer end of each fixing plate (5). The multiple fixing plates (5) on the leaking conveyor belt (2) are evenly distributed along the conveyor belt.

3. The water supply and drainage sludge dewatering treatment device according to claim 2, characterized in that: A first motor (9) is installed on the outer side wall of the dehydration tank (3). The output end of the first motor (9) is fixedly connected to a rotating shaft (11).

4. The water supply and drainage sludge dewatering treatment device according to claim 3, wherein: The sludge secondary dehydration discharging assembly (8) includes a receiving hopper (30) fixed on the inner bottom side wall of the dehydration tank (3). A discharging dehydration cylinder (29) is fixedly connected to the lower end of the receiving hopper (30). The outer end of the discharging dehydration cylinder (29) extends outside the dehydration tank (3). A spiral feeding shaft (31) is rotatably installed in the receiving hopper (30). A third motor (32) is installed on the outer side wall of the dehydration tank (3). The output end of the third motor (32) is fixedly connected to the spiral feeding shaft (31).

5. The water supply and drainage sludge dewatering treatment device according to claim 4, characterized in that: The three dehydration pressure rollers (22) between the rotating frame (20) and the rubber sheet (19) are distributed in a triangle. Dehydration pressing plates (21) are symmetrically and integrally connected to the outer surface of the dehydration pressure rollers (22).

6. The water supply and drainage sludge dewatering treatment device according to claim 5, characterized in that: A pulling rope (13) is connected between the center of the rubber sheet (19) and the center of the bottom dehydration gauze (14).

7. A water supply and drainage sludge dewatering treatment device according to claim 6, characterized in that: The discharging dehydration cylinder (29) is a conical cylinder. The diameter of the end of the discharging dehydration cylinder (29) extending outside the dehydration tank (3) is smaller than the diameter of the end of the discharging dehydration cylinder (29) connected to the receiving hopper (30). The spiral feeding shaft (31) is a conical spiral rod. The discharging dehydration cylinder (29) is a mesh cylinder.

8. A water supply and drainage sludge dewatering treatment device according to claim 1, characterized in that: A sludge baffle (7) is fixedly arranged at the connection between the rectangular sludge tank (1) and the dehydration tank (3).

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