A sludge dewatering treatment device for urban sewage

Abstract

This invention belongs to the technical field of sludge dewatering equipment and discloses a sludge dewatering treatment device for urban sewage. The device includes a casing, with a feeding hopper and a discharging hopper respectively located at the bottom of the top and side walls of the casing. A central shaft is fixedly connected to the output end of a drive motor on the top wall of the casing, and the central shaft is movably connected to the casing. This sludge dewatering treatment device utilizes a sludge dewatering mechanism design, achieving dewatering through spraying, extruding, and heating of sludge, significantly improving the efficiency of sludge dewatering operations. The discharge assembly and steam pressurization recovery mechanism enable rapid discharge of dried sludge, achieving continuous sludge processing and solving the problems mentioned in the background art.

Description

Technical Field

[0001] This invention relates to the technical field of sludge dewatering equipment, specifically a sludge dewatering treatment device for urban sewage. Background Technology

[0002] Wastewater contains a large amount of sludge. Directly discharging the sludge along with the wastewater would result in waste of the sludge. Therefore, sludge dewatering is necessary. Currently, sludge dewatering involves stirring the sludge and then using a squeezing method. Such equipment is typically large and time-consuming, making continuous dewatering difficult. For example, filter presses have long processing times per cycle, and sludge discharge also requires a considerable amount of time. Therefore, we propose a sludge dewatering treatment device for urban wastewater. Summary of the Invention

[0003] The purpose of this invention is to provide a sludge dewatering treatment device for urban sewage, which solves the problems mentioned in the background art.

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

[0005] A mixing tank is fixedly connected to the inner top wall of the machine casing. The central shaft is inserted inside the mixing tank. A mixing rod is installed on the central shaft and inside the mixing tank. Several mud discharge holes are opened on the bottom wall of the mixing tank. A sleeve is movably connected to the bottom wall of the mixing tank corresponding to the position of the mud discharge holes. The sleeve is also fixedly connected to the central shaft. A mud dewatering mechanism is also provided inside the machine casing for mud dewatering.

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

[0007] The casing is also equipped with a steam pressurization and recovery mechanism for steam recovery.

[0008] Preferably, the mud spraying assembly includes a crossbar, a mud spraying shell, a butterfly valve, an ultrasonic generator, a mud discharge port, and a scraper. One end of the crossbar is fixedly connected to the central shaft, and the mud spraying shell is fixedly connected to the other end of the crossbar. The butterfly valve is fixedly installed on the top wall of the mud spraying shell and communicates with the inside of the mud spraying shell. The feed port of the butterfly valve is connected to the inside of the sleeve through a connecting pipe. The ultrasonic generator is fixedly installed on the inner wall of the mud spraying shell. The bottom wall of the mud spraying shell has a funnel-shaped cross-section, and the mud discharge port is located at the lowest point of the bottom wall of the mud spraying shell. 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 plate, and an electric heating tube. The protective shell is fixedly connected to the lower surface of the mud-laying ring, the heat spreader plate is fixedly installed on the lower surface of the mud-laying ring and is located inside the protective shell, and the electric heating tube is fixedly installed on the heat spreader plate.

[0010] Preferably, the discharge assembly includes an inner ring, drainage holes, strip grooves, perforations, guide tubes, a push rod, and an arc-shaped push plate. The inner ring is fixedly connected to the inner wall of the mud-laying ring, and the top of the inner ring extends upward above the upper surface of the mud-laying ring. The inner ring has evenly distributed drainage holes. The outer wall of the inner ring has several strip grooves. A perforation is formed 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 at the position corresponding to the perforation. The push rod is inserted into the guide tube. The arc-shaped push plate is inserted into the strip groove. A spring groove is also formed in the bottom wall of the strip groove. The bottom wall of the spring groove is connected to the inner wall of the arc-shaped push plate by a limiting spring. 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 pressurization and recovery mechanism to move in the guide tube.

[0011] Preferably, the steam pressurization and recovery mechanism includes an extraction hood, a spiral flat tube, an air pump, a pressurization bottle, a pressure relief valve, a first switch valve, an air supply pipe, a second switch valve, and a drain pipe. The spiral flat tube is installed on the outer wall of the mixing tank. The air outlet of the extraction hood is fixedly connected to the air inlet of the spiral flat tube, and the air inlet of the extraction hood points towards the upper surface of the sludge-laying ring. The air pump is fixedly installed on the inner wall of the machine casing, and the air inlet of the air pump is connected to the air outlet of the spiral flat tube. The pressurization bottle is fixedly installed on the outer wall of the machine casing, and the air outlet of the air pump is connected to the air inlet of the pressurization bottle. A pressure relief valve and a first switch valve are fixedly installed on the side wall of the pressurization bottle. The air inlet of the air supply pipe is fixedly connected to the first switch valve. The bottom of the pressurization bottle is fixedly connected to the drain pipe through the second switch valve. The air supply pipe is connected to the guide pipe, and the air supply pipe supplies air into the guide pipe, causing the push rod to drive the arc-shaped push plate to push the sludge on the upper surface of the sludge-laying ring.

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

[0013] Preferably, a drain pipe is fixedly connected to the lower surface of the housing, a conveying ring is fixedly connected to the central axis extending downward and connected to the central axis via a connecting rod, and a guide plate is fixedly connected to the inner wall of the housing at the position corresponding to the discharge hopper to guide the dried sludge on the conveying ring to the discharge hopper.

[0014] Preferably, the end of the push rod away from the arc-shaped push plate is provided with an air groove, and the lower surface of the push rod is provided with a plurality of exhaust holes communicating with the air groove along its axial direction.

[0015] By adopting the aforementioned technical solution, the beneficial effects of the present invention are:

[0016] This sludge dewatering treatment device for urban sewage utilizes a sludge dewatering mechanism to achieve dewatering by spraying sludge, squeezing, and heating it. This significantly improves the efficiency of sludge dewatering operations. The discharge component and steam pressurization recovery mechanism enable rapid discharge of dried sludge, achieving continuous sludge processing and solving the problems mentioned in the background technology. Attached Figure Description

[0017] Figure 1 This is a cross-sectional view of the present invention;

[0018] Figure 2 For the present invention Figure 1 Enlarged view of point A in the middle;

[0019] Figure 3 For the present invention Figure 1 Enlarged view of point B in the middle;

[0020] Figure 4 For the present invention Figure 3 Enlarged view of point C in the middle;

[0021] Figure 5 This is a schematic diagram of the material discharge component of the present invention.

[0022] In the diagram: 1. Machine casing; 2. Feed hopper;

[0023] Mud dewatering mechanism; 31. Mud laying ring; 32. Mud spraying assembly; 321. Crossbar; 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 distribution plate; 353. Electric heating tube; 36. Discharge assembly; 361. Inner ring; 362. Drainage hole; 363. Strip groove; 364. Perforation; 365. Guide tube; 366. Top rod; 367. Arc-shaped push plate; 368. Spring groove; 369. Limiting spring;

[0024] 4. Discharge hopper; 5. Drive motor;

[0025] Steam pressurization and recovery mechanism; 61. Evacuation hood; 62. Spiral flat tube; 63. Air pump; 64. Pressurization bottle; 65. Pressure relief valve; 66. Switch valve one; 67. Air supply pipe; 68. Switch valve two; 69. Drain pipe;

[0026] 7. Mixing tank; 8. Mixing rod; 9. Spiral blade; 10. Mud discharge hole; 11. Central shaft; 12. Connecting pipe; 13. Connecting rod; 14. Conveying ring; 15. Guide plate; 16. Sleeve; 17. Air groove; 18. Exhaust hole. Detailed Implementation

[0027] Please see Figure 1-5 The present invention provides a technical solution: a sludge dewatering treatment device for urban sewage, comprising a housing 1, a feeding hopper 2 fixedly installed on the top wall of the housing 1, a discharge hopper 4 fixedly installed at the bottom end of the side wall of the housing 1, a drive motor 5 fixedly installed on the top wall of the housing 1, and a central shaft 11 fixedly connected to the output end of the drive motor 5. The central shaft 11 is movably connected to the top wall of the housing 1 and extends into the housing 1.

[0028] A mixing tank 7 is fixedly connected to the inner top wall of the casing 1. A central shaft 11 is inserted inside the mixing tank 7. The feeding hopper 2 is connected to the inside of the mixing tank 7. A mixing rod 8 is fixedly connected to the central shaft 11 inside the mixing tank 7. A spiral blade 9 is fixedly connected to the central shaft 11 near the bottom wall of the mixing tank 7 for conveying mud. Several mud discharge holes 10 are opened on the bottom wall of the mixing tank 7. A sleeve 16 is movably connected to the bottom wall of the mixing tank 7 corresponding to the mud discharge holes 10 through a bearing. The sleeve 16 is also fixedly connected to the central shaft 11. A mud dewatering mechanism 3 is set on the lower side of the casing 1 and the mixing tank 7 for mud dewatering.

[0029] The mud dewatering mechanism 3 includes a mud-laying ring 31, a mud-spraying assembly 32, a support rod 33, a mud-pressing roller 34, a heating assembly 35, and a discharge assembly 36. The mud-laying ring 31 is fixedly connected to the inner wall of the housing 1 by a connecting rod, and the axis of the mud-laying ring 31 coincides with the axis of the central shaft 11. The mud-spraying assembly 32 is mounted on the central shaft 11 and located above the mud-laying ring 31, and is used to spray mud onto the upper surface of the mud-laying ring 31. The mud-spraying assembly 32 is connected to the connecting pipe 12. Slurry is obtained from inside the sleeve 16. One end of a 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-laying ring 31 and is equipped with a mud-pressing roller 34 to press and dewater the slurry. The mud-pressing roller 34 is made of rubber and can adapt to the increase in the thickness of the sludge on the mud-laying ring 31. The heating component 35 is installed on the lower surface of the mud-laying ring 31 to heat and dewater the slurry. The discharge component 36 is installed inside the mud-laying ring 31 for discharging the dewatered sludge.

[0030] The casing 1 is also equipped with a steam pressurization and recovery mechanism 6 for steam recovery.

[0031] The mud spraying assembly 32 includes a crossbar 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 crossbar 321 is fixedly connected to the central shaft 11, and the mud spraying shell 322 is fixedly connected to the other end of the crossbar 321. The crossbar 321 and the support rod 33 should be installed separately. 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 connected to 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 of the mud spraying shell 322 has a funnel-shaped cross section. The mud discharge port 325 is located 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.

[0032] The heating assembly 35 includes a protective shell 351, a heat spreader plate 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 plate 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 plate 352.

[0033] The discharge assembly 36 includes an inner ring 361, drainage holes 362, strip grooves 363, perforations 364, guide tubes 365, push rods 366, arc-shaped push plates 367, spring grooves 368, and limiting springs 369. The inner ring 361 is fixedly connected to the inner wall of the mud-laying ring 31, and the top of the inner ring 361 extends upward above the upper surface of the mud-laying ring 31. The inner ring 361 has evenly distributed drainage holes 362. The inner side of the mud-laying ring 31 slopes downward for wastewater discharge. Several strip grooves 363 are formed on the outer wall of the inner ring 361. The bottom wall of the strip grooves 363... A perforation 364 is provided in the middle. A guide tube 365 is fixedly connected to the inner wall of the inner ring 361 at the position corresponding to the perforation 364. A push rod 366 is inserted into the guide tube 365. An arc-shaped push plate 367 is inserted into the strip groove 363. A spring groove 368 is also provided on the bottom wall of the strip groove 363. The bottom wall of the spring groove 368 is connected to the inner side wall of the arc-shaped push plate 367 through a limiting spring 369. One end of the push rod 366 passes through the perforation 364 and is fixedly connected to the arc-shaped push plate 367. The push rod 366 is powered by the steam pressurization and recovery mechanism 6 to move in the guide tube 365.

[0034] An air groove 17 is provided at the end of the push rod 366 away from the arc-shaped push plate 367. Several exhaust holes 18 communicating with 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 tilted in the opposite direction to the arc-shaped push plate 367 to enhance its ability to blow off sludge. There are no less than two exhaust holes 18, and the diameter of each exhaust hole 18 increases from the arc-shaped push plate 367 to the air supply pipe 67 to ensure the continuity of the push rod 366 under the thrust of the airflow.

[0035] The steam pressurization and recovery mechanism 6 includes an extraction hood 61, a spiral flat tube 62, an air pump 63, a pressurization bottle 64, a pressure relief valve 65, a first switching valve 66, an air supply pipe 67, a second switching valve 68, and a drain pipe 69. The spiral flat tube 62 is installed on the outer wall of the mixing tank 7. The outlet end of the extraction hood 61 is fixedly connected to the inlet end of the spiral flat tube 62, and the inlet end of the extraction hood 61 points towards the upper surface of the mud-laying ring 31. The air pump 63 is fixedly installed on the inner wall of the housing 1, and the inlet end of the air pump 63 is connected to the outlet end of the spiral flat tube 62. The pressurization bottle 64 is fixedly installed on the outer wall of the housing 1, and the outlet end of the air pump 63 is connected to the inlet end of the pressurization bottle 64. The side wall of the pressurization bottle 64 is fixed with... The pressure relief valve 65 and the first switch valve 66 are installed. The air inlet of the air supply pipe 67 is fixedly connected to the first switch valve 66. In actual implementation, the first switch valve 66 should be connected to the air inlet 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 and air supply feeding. The bottom of the pressure bottle 64 is fixedly connected to the drain pipe 69 through the second switch valve 68. The air supply pipe 67 is connected to the guide pipe 365. The air supply pipe 67 supplies air into the guide pipe 365, causing the push rod 366 to drive the arc-shaped push plate 367 to push the sludge on the upper surface of the mud-laying ring 31.

[0036] A drain pipe 69 is fixedly connected to the lower surface of the casing 1. The central shaft 11 extends downward and is fixedly connected to a conveying ring 14 via a connecting rod 13. A guide plate 15 is fixedly connected to the inner wall of the casing 1 at the position corresponding to the discharge hopper 4 to guide the dried sludge on the conveying ring 14 to the discharge hopper 4.

[0037] When this sludge dewatering treatment device for urban sewage is in operation, sludge and chemicals are fed into the mixing tank 7 through the feeding hopper 2. The drive motor 5 drives the central shaft 11 to drive the mixing rod 8 to mix the sludge, making it uniform and easy to flow. The butterfly valve 323 opens, and the sludge enters the sludge spraying shell 322. After being dispersed by the ultrasonic generator 324, it falls onto the sludge spreading ring 31 and is then scraped flat on the sludge spreading ring 31 by the scraper 326. The heat emitted by the electric heating tube 353 is transferred to the sludge spreading ring 31 through the heat spreader 352, heating the scraped sludge and causing water separation to generate water vapor. At the same time, the pressing roller 34 squeezes the sludge to dewater it. The air pump 63 draws steam through the air extraction hood 61. When the steam passes through the spiral flat tube 62, it exchanges heat with the sludge in the mixing tank 7 to preheat the sludge. Then, it enters the pressure bottle 64 for pressurization. As water droplets form and slurry is sprayed layer by layer onto the upper surface of the mud-laying ring 31 to the set thickness, the amount of slurry sprayed gradually decreases. Assuming that a single dewatering process requires four cycles from the start of slurry spraying to material discharge, the switch valve 66 can be opened on the fourth cycle. Moist, high-pressure gas is blown into the guide tube 365, and the airflow enters the air groove 17 to push the push rod 366, causing the arc-shaped push plate 367 to push the dry sludge on the mud-laying ring 31 onto the conveying ring 14. During this process, the moist airflow enters through the exhaust hole 18 and accelerates the separation between the dry sludge and the upper surface of the mud-laying ring 31. With the rotation of the conveying ring 14, the sludge is guided by the guide plate 15 to the discharge hopper 4 and discharged from the casing 1. It should be noted that the corresponding guide tube 365 should be vented only after the pressing roller 34 has passed through to avoid the pressing roller 34 blocking the movement of the arc-shaped push plate 367.

[0038] Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the invention is not to be limited to the embodiments shown herein, but is to be accorded 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 provided at the bottom ends of the top wall and side walls of the housing, characterized in that: The output end of the drive motor on the top wall of the housing is fixedly connected to a central shaft, which is movably connected to the housing. A mixing barrel is fixedly connected to the inner top wall of the machine casing. A central shaft is inserted inside the mixing barrel. A mixing rod is installed on the central shaft and inside the mixing barrel. Several mud discharge holes are opened on the bottom wall of the mixing barrel. A sleeve is movably connected to the bottom wall of the mixing barrel corresponding to the position of the mud discharge holes. The sleeve is also fixedly connected to the central shaft. A mud dewatering mechanism is also provided inside the machine casing for mud dewatering. The sludge dewatering mechanism includes a sludge-laying ring, a sludge-spraying assembly, a support rod, a sludge-pressing roller, a heating assembly, and a discharge assembly. The sludge-laying ring is fixedly connected to the inner wall of the machine casing by a connecting rod, and the axis of the sludge-laying ring coincides with the axis of the central shaft. The sludge-spraying assembly is set on the central shaft and located above the sludge-laying ring. It is used to spray sludge onto the upper surface of the sludge-laying ring. The sludge-spraying assembly obtains sludge from the sleeve through a connecting pipe. One end of the support rod is also fixedly connected to the central shaft. The other end of the support rod extends to the upper side of the sludge-laying ring and is equipped with a sludge-pressing roller to pressurize and dewater the sludge. The heating assembly is installed on the lower surface of the sludge-laying ring to heat and dewater the sludge. The discharge assembly is installed inside the sludge-laying ring for discharging the dewatered sludge. The casing is also equipped with a steam pressurization and recovery mechanism for steam recovery.

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

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

4. The sludge dewatering treatment device for urban sewage according to claim 3, characterized in that: The discharge assembly includes an inner ring, drainage holes, strip grooves, perforations, guide tubes, a push rod, and an arc-shaped push plate. The inner ring is fixedly connected to the inner wall of the mud-laying ring, and the top of the inner ring extends upward above the upper surface of the mud-laying ring. The inner ring has evenly distributed drainage holes. The outer wall of the inner ring has several strip grooves. A perforation is formed 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 at the position corresponding to the perforation. The push rod is inserted into the guide tube. The arc-shaped push plate is inserted into the strip groove. A spring groove is also formed in the bottom wall of the strip groove. The bottom wall of the spring groove is connected to the inner wall of the arc-shaped push plate by a limiting spring. 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 pressurization and 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 pressurization and recovery mechanism includes an extraction hood, a spiral flat tube, an air pump, a pressurization bottle, a pressure relief valve, a first switch valve, an air supply pipe, a second switch valve, and a drain pipe. The spiral flat tube is installed on the outer wall of the mixing tank. The air outlet of the extraction hood is fixedly connected to the air inlet of the spiral flat tube, and the air inlet of the extraction hood points towards the upper surface of the sludge-laying ring. The air pump is fixedly installed on the inner wall of the machine casing, and the air inlet of the air pump is connected to the air outlet of the spiral flat tube. The pressurization bottle is fixedly installed on the outer wall of the machine casing, and the air outlet of the air pump is connected to the air inlet of the pressurization bottle. A pressure relief valve and a first switch valve are fixedly installed on the side wall of the pressurization bottle. The air inlet of the air supply pipe is fixedly connected to the first switch valve. The bottom of the pressurization bottle is fixedly connected to the drain pipe through the second switch valve. The air supply pipe is connected to the guide pipe, and the air supply pipe supplies air into the guide pipe, causing the push rod to drive the arc-shaped push plate to push the sludge on the upper surface of the sludge-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 inclined downwards for wastewater discharge.

7. A sludge dewatering treatment device for urban sewage according to claim 6, characterized in that: A drain pipe is fixedly connected to the lower surface of the casing. A conveying ring is fixedly connected to the central axis extending downward and connected to the central axis via a connecting rod. A guide plate is fixedly connected to the inner wall of the casing at the position corresponding to the discharge hopper to guide the dried sludge on the conveying ring to the discharge hopper.

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

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