Sludge dewatering treatment device for urban sewage

Abstract

The invention belongs to the technical field of sludge dewatering equipment, and discloses a sludge dewatering treatment device for urban sewage. The sludge dewatering treatment device for urban sewage comprises a machine shell, a feeding hopper and a discharging hopper are arranged at the bottom end of the top wall and the bottom end of the side wall of the machine shell respectively, the output end of a driving motor on the top wall of the machine shell is fixedly connected with a center shaft, and the center shaft is movably connected to the machine shell. According to the sludge dewatering treatment device for the urban sewage, the sludge dewatering purpose is achieved by extruding and heating sprayed sludge through the design of the sludge dewatering mechanism, the working efficiency of sludge dewatering operation can be greatly improved, rapid discharging of dried sludge can be achieved through the discharging assembly and the steam pressurizing and recycling mechanism, and the sludge dewatering treatment device has the advantages of being simple in structure and convenient to use. The continuous processing of the sludge is realized, and the problems in the background technology are solved.

Description

Technical Field

[0001] The invention relates to the technical field of sludge dewatering equipment, in particular to a sludge dewatering treatment device used in urban sewage. Background Art

[0002] Sewage contains a large amount of sludge. If the sludge is directly discharged with sewage, it will cause waste of sludge. Therefore, the sludge needs to be dehydrated. At present, when dehydrating the sludge, the sludge is stirred and then squeezed to dehydrate the sludge. This type of equipment is usually large in size and time-consuming. It is usually difficult to achieve continuous dehydration processing. For example, filter press equipment takes a long time for a single processing and it also takes a long time to discharge the sludge. Therefore, we propose a sludge dehydration treatment device for urban sewage. Summary of the invention

[0003] The object of the present invention is to provide a sludge dewatering treatment device for urban sewage, which solves the problems raised in the background technology.

[0004] To achieve the above objectives, the present invention is implemented through the following technical solutions: a sludge dewatering treatment device for urban sewage, comprising a casing, wherein a feeding hopper and a discharging hopper are respectively arranged at the top wall and the bottom end of the side wall of the casing, and the output end of the driving motor on the top wall of the casing is fixedly connected to a central shaft, and the central shaft is movably connected to the casing.

[0005] The inner top wall of the casing is fixedly connected with a mixing barrel, the central axis is inserted in the mixing barrel, a mixing rod is arranged on the central axis and in the mixing barrel, a plurality of mud discharge holes are opened on the bottom wall of the mixing barrel, a sleeve is movably connected with the position of the mud discharge holes on the bottom wall of the mixing barrel, the sleeve is also fixedly connected with the central axis, and a mud dehydration mechanism is also arranged in the casing for mud dehydration.

[0006] The mud dewatering mechanism includes a mud laying ring, a mud spraying assembly, a support rod, a mud pressing roller, a heating assembly and a discharging assembly. The mud laying ring is fixedly connected to the inner wall of the casing by a connecting rod, and the axis of the mud laying ring coincides with the axis of the central axis. The mud spraying assembly is arranged on the central axis and is located on the upper side of the mud laying ring, and is used to spray mud on the upper surface of the mud laying ring, and the mud spraying assembly obtains mud from the sleeve through a connecting pipe. One end of the support rod is also fixedly connected to the central axis, and the other end of the support rod extends to the upper side of the mud laying ring and is equipped with a mud pressing roller to pressurize and dehydrate the mud. The heating assembly is installed on the lower surface of the mud laying ring to heat and dehydrate the mud, and the discharging assembly is installed in the mud laying ring for discharging the dehydrated sludge.

[0007] A steam pressurization recovery mechanism is also provided in the casing for steam recovery.

[0008] Preferably, the mud spraying assembly includes a cross bar, a mud spraying shell, a butterfly valve, an ultrasonic generator, a mud discharge port and a scraper, one end of the cross bar is fixedly connected to the central axis, the mud spraying shell is fixedly connected to the other end of the cross bar, the butterfly valve is fixedly mounted on the top wall of the mud spraying shell and communicated with the inside of the mud spraying shell, the feed port of the butterfly valve is communicated with the inside of the sleeve through a connecting pipe, the ultrasonic generator is fixedly mounted on the inner wall of the mud spraying shell, the bottom wall cross-section of the mud spraying shell is funnel-shaped, the mud discharge port is at the lowest point of the bottom wall of the mud spraying shell, and the scraper is fixedly connected to the lower surface of the mud spraying shell near the mud discharge port.

[0009] Preferably, the heating assembly includes a protective shell, a heat spreader and an electric heating tube. The protective shell is fixedly connected to the lower surface of the mud-laying ring. The heat spreader is fixedly installed on the lower surface of the mud-laying ring and is located in the protective shell. The electric heating tube is fixedly installed on the heat spreader.

[0010] Preferably, the discharging assembly includes an inner ring, drainage holes, strip grooves, perforations, a guide tube, a push rod and an arc-shaped push plate. The inner ring is fixedly connected to the inner side wall of the mud-laying ring, and the top end of the inner ring extends upwardly above the upper surface of the mud-laying ring. The inner ring is provided with evenly distributed drainage holes, and the outer wall of the inner ring is provided with a plurality of strip grooves. A perforation is provided in the middle of the bottom wall of the strip groove. A guide tube is fixedly connected to the inner wall of the inner ring corresponding to the perforation. The push rod is inserted in the guide tube, and the arc-shaped push plate is inserted in the strip groove. A spring groove is also provided in the bottom wall of the strip groove. The bottom wall of the spring groove is connected to the inner side wall of the arc-shaped push plate by a limit spring, and one end of the push rod passes through the perforation and is fixedly connected to the arc-shaped push plate. The push rod is powered by a steam pressurized recovery mechanism to move in the guide tube.

[0011] Preferably, the steam pressurized recovery mechanism includes an exhaust hood, a spiral flat tube, an air pump, a pressurizing bottle, a pressure relief valve, a switch valve 1, an air supply pipe, a switch valve 2 and a drain pipe, the spiral flat tube is installed on the outer wall of the mixing barrel, the air outlet end of the exhaust hood is fixedly connected to the air inlet end of the spiral flat tube, the air inlet end of the exhaust hood points to the upper surface of the mud laying ring, the air pump is fixedly installed on the inner wall of the casing, the air inlet end of the air pump is connected to the air outlet end of the spiral flat tube, the pressurizing bottle is fixedly installed on the outer wall of the casing, the air outlet end of the air pump is connected to the air inlet end of the pressurizing bottle, the side walls of the pressurizing bottle are respectively fixedly installed with a pressure relief valve and a switch valve 1, the switch valve 1 is fixedly connected with the air inlet end of the air supply pipe, the bottom of the pressurizing bottle is fixedly connected with a drain pipe through the switch valve 2, the air supply pipe is connected with the guide pipe, and the air supply pipe supplies air into the guide pipe so that the push rod drives the arc-shaped push plate to push the sludge on the upper surface of the mud laying ring.

[0012] Preferably, the inner side of the mud-laying ring is tilted downward for sewage discharge.

[0013] Preferably, the lower surface of the casing is fixedly connected to a drain pipe, the central axis extends downward and is fixedly connected to a material transport ring through a connecting rod, and a guide plate is fixedly connected to the position of the inner wall of the casing corresponding to the discharge hopper for guiding the dry sludge on the material transport ring to the discharge hopper.

[0014] Preferably, an air groove is formed at one end of the push rod away from the arc-shaped push plate, and a plurality of exhaust holes connected to the air groove are formed on the lower surface of the push rod along its axial direction.

[0015] By adopting the above technical solution, the beneficial effects of the present invention are: The sludge dewatering treatment device used in urban sewage utilizes the design of a sludge dewatering mechanism to achieve the purpose of dehydration by spraying sludge, extruding it, and heating it, which can greatly improve the work efficiency of the sludge dewatering operation. The discharge component and the steam pressurized recovery mechanism can realize the rapid discharge of dry sludge, realize continuous processing of sludge, and solve the problems raised in the background technology. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a cross-sectional view of the present invention; Figure 2 For the present invention Figure 1 The enlarged view of point A in the middle; Figure 3 For the present invention Figure 1 The enlarged view of point B in the middle; Figure 4 For the present invention Figure 3 The enlarged view of the middle C; Figure 5 It is a structural schematic diagram of the discharging assembly of the present invention.

[0017] In the figure: 1. housing; 2. hopper; Mud dewatering mechanism; 31, mud spreading ring; 32, mud spraying assembly; 321, cross bar; 322, mud spraying shell; 323, butterfly valve; 324, ultrasonic generator; 325, mud discharge port; 326, scraper; 33, support rod; 34, mud pressing roller; 35, heating assembly; 351, protective shell; 352, heat plate; 353, electric heating pipe; 36, discharge assembly; 361, inner ring; 362, drainage hole; 363, strip groove; 364, perforation; 365, guide tube; 366, push rod; 367, arc push plate; 368, spring groove; 369, limit spring; 4. Discharging hopper; 5. Driving motor; Steam pressurization recovery mechanism; 61, vacuum hood; 62, spiral flat tube; 63, air pump; 64, pressurization bottle; 65, pressure relief valve; 66, switch valve 1; 67, air supply pipe; 68, switch valve 2; 69, drain pipe; 7. Mixing barrel; 8. Mixing rod; 9. Spiral blade; 10. Mud discharge hole; 11. Center axis; 12. Connecting pipe; 13. Connecting rod; 14. Material transport ring; 15. Material guide plate; 16. Sleeve; 17. Air groove; 18. Exhaust hole. DETAILED DESCRIPTION

[0018] See also Figure 1-5 The present invention provides a technical solution: a sludge dewatering treatment device for urban sewage, comprising a casing 1, a feeding hopper 2 is fixedly installed on the top wall of the casing 1, a discharging hopper 4 is fixedly installed on the bottom end of the side wall of the casing 1, a driving motor 5 is fixedly installed on the top wall of the casing 1, and the output end of the driving motor 5 is fixedly connected to a central shaft 11, and the central shaft 11 is movably connected to the top wall of the casing 1 and extends into the casing 1.

[0019] A mixing barrel 7 is fixedly connected to the inner top wall of the casing 1, a central axis 11 is inserted in the mixing barrel 7, a feeding hopper 2 is communicated with the mixing barrel 7, a mixing rod 8 is fixedly connected on the central axis 11 and in the mixing barrel 7, a spiral blade 9 is fixedly connected on the central axis 11 near the bottom wall of the mixing barrel 7 for conveying mud, a plurality of mud discharge holes 10 are provided on the bottom wall of the mixing barrel 7, a sleeve 16 is movably connected to the position of the bottom wall of the mixing barrel 7 corresponding to the mud discharge holes 10 through a bearing, the sleeve 16 is also fixedly connected to the central axis 11, a mud dehydration mechanism 3 is provided on the casing 1 and at the lower side of the mixing barrel 7 for mud dehydration.

[0020] The mud dewatering mechanism 3 includes a mud spreading ring 31, a mud spraying assembly 32, a support rod 33, a mud pressing roller 34, a heating assembly 35 and a discharging assembly 36. The mud spreading ring 31 is fixedly connected to the inner wall of the casing 1 through a connecting rod, and the axis of the mud spreading ring 31 coincides with the axis of the central axis 11. The mud spraying assembly 32 is arranged on the central axis 11 and is located on the upper side of the mud spreading ring 31, and is used to spray mud on the upper surface of the mud spreading ring 31, and the mud spraying assembly 32 is connected to the inner wall of the casing 1 through a connecting rod. The mud is obtained from the sleeve 16, and one end of the support rod 33 is fixedly connected to the central shaft 11. The other end of the support rod 33 extends to the upper side of the mud spreading ring 31 and is equipped with a mud pressing roller 34 to pressurize and dehydrate the mud. The mud pressing roller 34 is made of rubber material and can adapt to the increase in the thickness of the sludge on the mud spreading ring 31. The heating component 35 is installed on the lower surface of the mud spreading ring 31 to heat and dehydrate the mud. The discharge component 36 is installed inside the mud spreading ring 31 for discharging the dehydrated sludge.

[0021] A steam pressurization recovery mechanism 6 is also provided in the casing 1 for recovering steam.

[0022] The mud spraying assembly 32 includes a cross bar 321, a mud spraying shell 322, a butterfly valve 323, an ultrasonic generator 324, a mud discharge port 325 and a scraper 326. One end of the cross bar 321 is fixedly connected to the central axis 11, and the mud spraying shell 322 is fixedly connected to the other end of the cross bar 321. The cross bar 321 and the support rod 33 should be installed staggered. The butterfly valve 323 is fixedly installed on the top wall of the mud spraying shell 322 and communicates with the inside of the mud spraying shell 322. The feed port of the butterfly valve 323 is communicated with the inside of the sleeve 16 through the connecting pipe 12. The ultrasonic generator 324 is fixedly installed on the inner wall of the mud spraying shell 322. The bottom wall cross section of the mud spraying shell 322 is funnel-shaped. The mud discharge port 325 is at the lowest point of the bottom wall of the mud spraying shell 322. The scraper 326 is fixedly connected to the lower surface of the mud spraying shell 322 near the mud discharge port 325.

[0023] The heating assembly 35 includes a protective shell 351, a heat spreader 352 and an electric heating tube 353. The protective shell 351 is fixedly connected to the lower surface of the mud-laying ring 31. The heat spreader 352 is fixedly installed on the lower surface of the mud-laying ring 31 and is located inside the protective shell 351. The electric heating tube 353 is fixedly installed on the heat spreader 352.

[0024] The discharge assembly 36 includes an inner ring 361, a drainage hole 362, a strip groove 363, a perforation 364, a guide tube 365, a push rod 366, an arc-shaped push plate 367, a spring groove 368 and a limit spring 369. The inner ring 361 is fixedly connected to the inner side wall of the mud-laying ring 31, and the top of the inner ring 361 extends upward and is higher than the upper surface of the mud-laying ring 31. The inner ring 361 is provided with evenly distributed drainage holes 362. The inner side of the mud-laying ring 31 is tilted downward for sewage discharge. A plurality of strip grooves 363 are provided on the outer wall of the inner ring 361. The bottom wall of the strip groove 363 is A through hole 364 is provided in the middle part, and a guide tube 365 is fixedly connected to the inner wall of the inner ring 361 at a position corresponding to the through hole 364. The push rod 366 is inserted in the guide tube 365, and the arc push plate 367 is inserted in the strip groove 363. The bottom wall of the strip groove 363 is also provided with a spring groove 368. The bottom wall of the spring groove 368 is connected to the inner side wall of the arc push plate 367 through a limit spring 369, and one end of the push rod 366 passes through the through hole 364 and is fixedly connected to the arc push plate 367. The push rod 366 is powered by the steam pressurization recovery mechanism 6 to move in the guide tube 365.

[0025] An air groove 17 is provided at one end of the push rod 366 away from the arc-shaped push plate 367, and a plurality of exhaust holes 18 connected to the air groove 17 are provided on the lower surface of the push rod 366 along its axial direction. The outlet of the exhaust hole 18 can also be inclined in the opposite direction of the arc-shaped push plate 367 to enhance its ability to blow off sludge. The number of the exhaust holes 18 is not less than two, and the diameter of each exhaust hole 18 increases gradually from the arc-shaped push plate 367 to the air supply pipe 67, which can ensure the continuity of the thrust of the airflow on the push rod 366.

[0026] The steam pressurized recovery mechanism 6 includes an exhaust hood 61, a spiral flat tube 62, an air pump 63, a pressurized bottle 64, a pressure relief valve 65, a switch valve 1 66, an air supply pipe 67, a switch valve 2 68 and a drain pipe 69. The spiral flat tube 62 is installed on the outer wall of the mixing barrel 7, the air outlet end of the exhaust hood 61 is fixedly connected to the air inlet end of the spiral flat tube 62, and the air inlet end of the exhaust hood 61 points to the upper surface of the mud laying ring 31. The air pump 63 is fixedly installed on the inner wall of the casing 1, and the air inlet end of the air pump 63 is connected to the air outlet end of the spiral flat tube 62. The pressurized bottle 64 is fixedly installed on the outer wall of the casing 1, and the air outlet end of the air pump 63 is connected to the air inlet end of the pressurized bottle 64. The side walls of the pressurized bottle 64 are respectively fixed with the air pump 63 and the air pump 63 is connected to the air pump 64. A pressure relief valve 65 and a switch valve 66 are installed. The switch valve 66 is fixedly connected to the air inlet end of the air supply pipe 67. In actual implementation, the switch valve 66 should be connected to the air inlet ends of multiple air supply pipes 67, and the number of air supply pipes 67 is the same as the number of guide pipes 365. Each air supply pipe 67 is equipped with a solenoid valve, which can supply air to the designated guide pipe 365 in actual operation, and can achieve the effect of variable mud spraying while supplying air and unloading. The bottom of the pressurized bottle 64 is fixedly connected to a drain pipe 69 through a switch valve 68. The air supply pipe 67 is connected to the guide pipe 365. The air supply pipe 67 supplies air to the guide pipe 365 so that the push rod 366 drives the arc-shaped push plate 367 to push the sludge on the upper surface of the mud-laying ring 31.

[0027] The lower surface of the casing 1 is fixedly connected to a drain pipe 69, the central axis 11 extends downward and is fixedly connected to a material transport ring 14 through a connecting rod 13, and a guide plate 15 is fixedly connected to the position of the inner wall of the casing 1 corresponding to the discharge hopper 4 for guiding the dry sludge on the material transport ring 14 to the discharge hopper 4.

[0028] When the sludge dewatering treatment device for urban sewage is working, the mud and the reagent are put into the mixing barrel 7 through the feeding hopper 2, the driving motor 5 drives the central shaft 11 to drive the mixing rod 8 to mix the mud so that it is uniform and easy to flow, the butterfly valve 323 is opened, the mud enters the mud spraying shell 322, is shaken and dispersed by the ultrasonic generator 324, and then falls on the mud laying ring 31, and is then scraped flat on the mud laying ring 31 by the scraper 326, and the heat emitted by the electric heating tube 353 is transferred to the mud laying ring 31 through the heat spreader 352, heating the scraped mud to separate its moisture to generate water vapor, and at the same time, the mud pressing roller 34 squeezes the mud for dehydration, and the air pump 63 extracts steam through the exhaust hood 61. When the steam passes through the spiral flat tube 62, it exchanges heat with the mud in the mixing barrel 7 to preheat the mud, and then enters the pressurizing bottle 64 for pressurization Water droplets are formed, and the mud is sprayed layer by layer on the upper surface of the mud spreading ring 31 to the set thickness. During the process, the amount of mud spraying gradually decreases. Assuming that a single dehydration requires four circles from the beginning of mud spraying to the discharge of materials, the switch valve 66 can be opened at the fourth circle, and the moist high-pressure gas is blown into the guide pipe 365. The airflow enters the air groove 17 to push the push rod 366, so that the arc-shaped push plate 367 pushes the dry sludge on the mud spreading ring 31 onto the material transport ring 14, and in this process, the moist airflow enters the exhaust hole 18 between the dry sludge and the upper surface of the mud spreading ring 31 to accelerate the separation, and is guided by the guide plate 15 to the discharge hopper 4 and discharged from the casing 1 along with the rotation of the material transport ring 14. It should be noted that the corresponding guide pipe 365 should be ventilated only after the mud pressing roller 34 passes through, so as to prevent the mud pressing roller 34 from blocking the movement of the arc-shaped push plate 367.

[0029] Various modifications to these embodiments will be apparent to those skilled in the art. The general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the present invention will not be limited to the embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A sludge dewatering treatment device for urban sewage, comprising a housing, wherein a feeding hopper and a discharging hopper are respectively arranged at the top wall and the bottom end of the side wall of the housing, characterized in that: The output end of the driving motor on the top wall of the casing is fixedly connected to a central shaft, and the central shaft is movably connected to the casing; The inner top wall of the casing is fixedly connected with a mixing barrel, the central axis is inserted in the mixing barrel, a mixing rod is arranged on the central axis and in the mixing barrel, a plurality of mud discharge holes are opened on the bottom wall of the mixing barrel, a sleeve is movably connected at the position of the mud discharge holes on the bottom wall of the mixing barrel, and the sleeve is also fixedly connected with the central axis, and a mud dehydration mechanism is also arranged in the casing for mud dehydration; The mud dewatering mechanism includes a mud spreading ring, a mud spraying assembly, a support rod, a mud pressing roller, a heating assembly and a discharging assembly. The mud spreading ring is fixedly connected to the inner wall of the casing through a connecting rod, and the axis of the mud spreading ring coincides with the axis of the central axis. The mud spraying assembly is arranged on the central axis and is located on the upper side of the mud spreading ring, and is used to spray mud on the upper surface of the mud spreading ring, and the mud spraying assembly obtains mud from the sleeve through a connecting pipe. One end of the support rod is also fixedly connected to the central axis, and the other end of the support rod extends to the upper side of the mud spreading ring and is equipped with a mud pressing roller to pressurize and dehydrate the mud. The heating assembly is installed on the lower surface of the mud spreading ring to heat and dehydrate the mud, and the discharging assembly is installed inside the mud spreading ring for discharging the dehydrated sludge. A steam pressurization recovery mechanism is also arranged in the casing for steam recovery.

2. A sludge dewatering treatment device for urban sewage according to claim 1, characterized in that: The mud spraying assembly comprises a cross bar, a mud spraying shell, a butterfly valve, an ultrasonic generator, a mud discharge port and a scraper. One end of the cross bar is fixedly connected to the central axis, the mud spraying shell is fixedly connected to the other end of the cross bar, the butterfly valve is fixedly mounted on the top wall of the mud spraying shell and communicated with the inside of the mud spraying shell, the feed port of the butterfly valve is communicated with the inside of the sleeve through a connecting pipe, the ultrasonic generator is fixedly mounted on the inner wall of the mud spraying shell, the bottom wall cross section of the mud spraying shell is funnel-shaped, the mud discharge port is at the lowest point of the bottom wall of the mud spraying shell, and the scraper is fixedly connected to the lower surface of the mud spraying shell near the mud discharge port.

3. A sludge dewatering treatment device for urban sewage according to claim 2, characterized in that: The heating component includes a protective shell, a heat spreader and an electric heating tube. The protective shell is fixedly connected to the lower surface of the mud-laying ring. The heat spreader is fixedly installed on the lower surface of the mud-laying ring and is located in the protective shell. The electric heating tube is fixedly installed on the heat spreader.

4. A sludge dewatering treatment device for urban sewage according to claim 3, characterized in that: The discharging assembly includes an inner ring, drainage holes, strip grooves, perforations, a guide tube, a push rod and an arc-shaped push plate. The inner ring is fixedly connected to the inner side wall of the mud-laying ring, and the top end of the inner ring extends upward and is higher than the upper surface of the mud-laying ring. The inner ring is provided with evenly distributed drainage holes, and the outer wall of the inner ring is provided with a plurality of strip grooves. A perforation is provided in the middle of the bottom wall of the strip groove. A guide tube is fixedly connected to the position of the inner wall of the inner ring corresponding to the perforation. The push rod is inserted in the guide tube, and the arc-shaped push plate is inserted in the strip groove. A spring groove is also provided on the bottom wall of the strip groove. The bottom wall of the spring groove is connected to the inner side wall of the arc-shaped push plate by a limit spring, and one end of the push rod passes through the perforation and is fixedly connected to the arc-shaped push plate. The push rod is powered by a steam pressurized recovery mechanism to move in the guide tube.

5. A sludge dewatering treatment device for urban sewage according to claim 4, characterized in that: The steam pressurized recovery mechanism includes an exhaust hood, a spiral flat tube, an air pump, a pressurizing bottle, a pressure relief valve, a switch valve 1, an air supply pipe, a switch valve 2 and a drain pipe, the spiral flat tube is installed on the outer wall of the mixing barrel, the air outlet end of the exhaust hood is fixedly connected to the air inlet end of the spiral flat tube, the air inlet end of the exhaust hood points to the upper surface of the mud laying ring, the air pump is fixedly installed on the inner wall of the casing, the air inlet end of the air pump is connected to the air outlet end of the spiral flat tube, the pressurizing bottle is fixedly installed on the outer wall of the casing, the air outlet end of the air pump is connected to the air inlet end of the pressurizing bottle, the side walls of the pressurizing bottle are respectively fixedly installed with a pressure relief valve and a switch valve 1, the switch valve 1 is fixedly connected with the air inlet end of the air supply pipe, the bottom of the pressurizing bottle is fixedly connected with a drain pipe through the switch valve 2, the air supply pipe is connected with the guide pipe, and the air supply pipe supplies air into the guide pipe so that the push rod drives the arc-shaped push plate to push the sludge on the upper surface of the mud laying ring.

6. A sludge dewatering treatment device for urban sewage according to claim 5, characterized in that: The inner side of the mud-laying ring is tilted downward for sewage discharge.

7. A sludge dewatering treatment device for urban sewage according to claim 6, characterized in that: The lower surface of the casing is fixedly connected to a drainage pipe, the central axis extends downward and is fixedly connected to a material transport ring through a connecting rod, and a guide plate is fixedly connected to the position of the inner wall of the casing corresponding to the discharge hopper for guiding the dry sludge on the material transport ring to the discharge hopper.

8. The sludge dewatering treatment device for urban sewage according to claim 4, characterized in that: An air groove is provided at one end of the push rod away from the arc-shaped push plate, and a plurality of exhaust holes connected with the air groove are provided on the lower surface of the push rod along its axial direction.

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