A device and method for reducing sludge volume in urban wastewater treatment plants

Abstract

This invention discloses a sludge reduction device and method for urban wastewater treatment plants, relating to the field of sludge treatment technology. The device includes: a sedimentation tank; a sludge filter press located on the right side of the sedimentation tank; a sludge pump positioned between the sedimentation tank and the sludge filter press; a hydraulic rod installed on the inner wall of the sludge filter press; a filter plate slidably mounted on the output end of the hydraulic rod; a fixed frame fixedly mounted on the inner wall of the sludge filter press; a fixed rod fixedly mounted on the top of the inner wall of the filter plate; a trapezoidal frame slidably mounted on the top of the inner wall of the fixed frame; a sealing plate fixedly mounted on the surface of the trapezoidal frame; a trapezoidal plate fixedly mounted on the top of the sludge filter press; and a sliding rod slidably mounted on the surface of the filter plate. A triangular plate is used to assist in pushing sludge residue inside the filter cloth downwards, effectively preventing sludge residue from getting stuck inside the filter plate and avoiding subsequent reductions in sludge treatment volume and efficiency.

Description

Technical Field

[0001] This invention belongs to the field of sludge treatment, specifically relating to a sludge reduction device and method for urban wastewater treatment plants. Background Technology

[0002] A large amount of sludge is generated during the urban sewage treatment process, which requires centralized treatment.

[0003] Patent publication number CN207294558U relates to a sludge reduction device for urban wastewater treatment plants, comprising a primary sedimentation tank, a secondary sedimentation tank, a sludge thickening and drying tank, and a sludge composting tunnel chamber. The top of the primary sedimentation tank is connected to the secondary sedimentation tank via a pipe, and the bottoms of both the primary and secondary sedimentation tanks are connected to the sludge thickening and drying tank via pipes. The sludge thickening and drying tank is connected to the sludge composting tunnel chamber via a pipe, which includes an upper tunnel chamber and a lower tunnel chamber. This patent achieves sludge reduction in wastewater treatment equipment through sludge composting, and the sludge compost is used to improve urban greening soil, increasing sludge reuse efficiency and saving energy and protecting the environment. The two-layer sludge composting tunnel chamber reduces the floor space required for sludge composting and lowers the cost of sludge reduction and composting. It also provides uniform heating for the composted sludge, improving the efficiency and quality of sludge composting.

[0004] In existing technologies, sludge composting tunnel chambers are set up in two layers, which can reduce the floor space occupied by the sludge composting tunnel chamber and reduce the cost of sludge reduction composting. They can also evenly increase the temperature of composted sludge, improving the efficiency and quality of sludge composting. However, during the sludge dewatering process, sludge residue gets stuck inside the filter plate, which will affect the sludge treatment volume and reduce the treatment effect. At the same time, sludge will remain on the filter cloth during the treatment process, which will block the filter cloth pores and affect the sludge treatment efficiency. Summary of the Invention

[0005] Various embodiments of the disclosed technology relate to a sludge reduction device for urban wastewater treatment plants that can improve sludge dewatering.

[0006] According to the disclosed embodiments, a sludge reduction device for a municipal wastewater treatment plant includes: a sedimentation tank, a sludge filter press located on the right side of the sedimentation tank, a sludge pump located between the sedimentation tank and the sludge filter press, a hydraulic rod located on the inner wall of the sludge filter press, a filter plate slidably mounted on the output end of the hydraulic rod, a fixed frame fixedly mounted on the inner wall of the sludge filter press, a fixed rod fixedly mounted on the top of the inner wall of the filter plate, a trapezoidal frame slidably mounted on the top of the inner wall of the fixed frame, a sealing plate fixedly mounted on the surface of the trapezoidal frame, a trapezoidal plate fixedly mounted on the top of the sludge filter press, a sliding rod slidably mounted on the surface of the filter plate, a triangular plate fixedly mounted on the bottom of the sliding rod, and a drain pipe connected to the bottom of the filter plate. When the filter plate moves away from the fixed frame to reset and unload, the sliding rod loses its support, moves downward, and drives the triangular plate to move downward synchronously.

[0007] In some implementations, the inner wall of the filter plate is provided with filter cloth, the inner wall of the fixing frame is provided with a rubber diaphragm, the top of the fixing frame is provided with an air injection device, a first spring is provided between the fixing frame and the trapezoidal frame, and the trapezoidal frame is reset by the elastic force of the first spring, a second spring is provided between the filter plate and the sliding rod, and the sliding rod is reset by the elastic force of the second spring, and a reset spring is provided between the hydraulic rod and the filter plate, and the filter plate is reset by the elastic force of the reset spring.

[0008] In some implementations, the sludge filter press is equipped with an anti-adhesion device and a recycling device to prevent sludge adhesion. The anti-adhesion device includes an L-shaped slide plate, a fixed plate, a long plate, an L-shaped rod, and a trapezoidal slide plate. The inner wall of the filter plate has a groove. The L-shaped slide plate is slidably installed on the inner wall of the groove. The fixed plate is fixedly installed on the bottom of the L-shaped slide plate. The long plate is fixedly installed on the bottom of the filter plate. The L-shaped rod is slidably installed on the bottom of the fixed frame. The trapezoidal slide plate is slidably installed on the surface of the fixed frame. The L-shaped slide plate and the fixed plate move towards the fixed frame as the filter plate moves towards the fixed frame. When the L-shaped slide plate contacts the fixed frame, the reverse force pushes the L-shaped slide plate and the fixed plate away from the fixed frame.

[0009] In some implementations, a round rod is fixedly installed on the surface of the filter plate, a rotating plate is rotatably installed on the inner wall of the sludge filter press, and a limit plate is fixedly installed on the inner wall of the sludge filter press. During the reset process, the round rod is squeezed downward by the rotating plate, and the downward movement of the round rod will drive the filter plate to move downward. When the round rod is disengaged from the rotating plate, the elastic force of the reset spring will drive the filter plate to reset.

[0010] In some implementations, a No. 3 spring is provided between the L-shaped slide plate and the chute, and the L-shaped slide plate is reset by the elastic force of the No. 3 spring. A No. 4 spring is provided between the L-shaped rod and the fixed frame, and the L-shaped rod is reset by the elastic force of the No. 4 spring. A No. 5 spring is provided between the trapezoidal slide plate and the fixed frame, and the trapezoidal slide plate is reset by the elastic force of the No. 5 spring. A No. 1 torsion spring is provided between the sludge filter press and the rotating plate, and the rotating plate is reset by the elastic force of the No. 1 torsion spring.

[0011] In some implementations, the recycling device includes a collection frame, a tripod, a push rod, and a rotating plate. The collection frame is fixedly installed on the inner wall of the sludge filter press, the tripod is fixedly installed on the inner wall of the collection frame, the push rod is fixedly installed at the bottom of the trapezoidal slide plate, and the rotating plate is rotatably installed on the inner wall of the collection frame. The downward movement of the trapezoidal slide plate drives the push rod to move downward, which in turn pushes the rotating plate to rotate downward, opening the feed inlet of the collection frame and allowing the sludge accumulated above the rotating plate to fall into the collection frame.

[0012] In some implementations, a short plate is fixedly installed on the circumferential surface of the rotating plate, and a sliding plate is slidably installed on the inner wall of the collection frame. A connecting rope is fixedly installed at one end of the short plate, and the other end of the connecting rope is fixedly installed on the top of the sliding plate. When the connecting rope moves upward, it will pull the sliding plate upward. When the rotating plate is reset, it will lose the pull and move downward. The sludge inside is shaken flat by the up and down movement of the sliding plate.

[0013] In some implementations, a second torsion spring is provided between the rotating plate and the collecting frame, and the rotating plate is reset by the elastic force of the second torsion spring itself. A sixth spring is provided between the collecting frame and the sliding plate, and the sliding plate is reset by the elastic force of the sixth spring itself.

[0014] This invention provides a device and method for reducing sludge volume in urban wastewater treatment plants. It has the following beneficial effects: This invention utilizes a flexible rubber diaphragm that is pushed outward by air pressure, causing it to bulge outward and protrude towards one side of the filter plate. This directly squeezes the sludge cake in the middle of the filter cloth, allowing water to pass through the filter cloth and be discharged through the drain pipe. The sludge remains between the rubber diaphragm and the filter cloth. When the trapezoidal frame moves, it causes the sealing plate to move synchronously away from the fixed rod. This movement of the sealing plate away from the fixed rod opens the inlet of the sludge pump, allowing for normal sludge extraction. When the filter plate moves away from the fixed frame to reset and unload, the sealing plate re-seals the inlet of the sludge pump, preventing residual sludge and wastewater from continuously dripping from the sludge pump pipeline during the unloading stage and contaminating the sludge cake and equipment.

[0015] In this invention, when the filter plate moves towards the fixed frame, it drives the sliding rod to move towards the fixed frame in a synchronous manner. After the sliding rod moves, it contacts the inclined surface of the trapezoidal plate. Guided by the inclined surface of the trapezoidal plate, the sliding rod and the triangular plate move upward. When the filter plate moves away from the fixed frame to reset and unload, the sliding rod loses its support and automatically resets under the elastic force of the second spring. The sliding rod moves downward and drives the triangular plate to move downward in a synchronous manner. The downward displacement of the triangular plate assists in pushing the sludge inside the filter cloth, effectively preventing the sludge from getting stuck inside the filter plate and avoiding the problems of reduced sludge treatment volume and reduced treatment efficiency in the future.

[0016] This invention uses a fixed plate to reset and push the sludge inside the filter cloth away from the filter plate, preventing the sludge from getting stuck on the top of the filter cloth and affecting subsequent filtration. When the L-shaped rod reaches its limit position, it will hold the filter plate in place, preventing the filter plate from moving further towards the fixed frame, which would cause excessive sealing and clamping of the fixed frame and affect the service life of the equipment. When the round rod moves downward, it will drive the filter plate downward. When the round rod disengages from the rotating plate, the elasticity of the reset spring will drive the filter plate to reset. The up-and-down movement of the filter plate shakes off the sludge remaining inside the filter plate, improving the sludge cleaning effect.

[0017] This invention utilizes a trapezoidal sliding plate that moves downwards, causing a push rod to move downwards. The downward movement of the push rod pushes a rotating plate downwards, opening the inlet of the collection frame. The sludge accumulated above the rotating plate falls into the collection frame. When the filter plate resets, the elasticity of the second torsion spring causes the rotating plate to reset, sealing the collection frame. This prevents the inlet of the collection frame from remaining open for extended periods when there is untreated sludge, which could lead to odor leakage from the sludge inside the collection frame and affect the working environment. The sliding plate moves up and down to level the sludge inside, preventing it from accumulating on one side of the collection frame and blocking the inlet, thus affecting subsequent sludge collection. Attached Figure Description

[0018] Figure 1 This is an overall schematic diagram illustrating an exemplary embodiment of the disclosed technology; Figure 2 This is a schematic cross-sectional view illustrating an exemplary embodiment of the disclosed technology; Figure 3 This is a schematic diagram illustrating a filter plate and a round rod according to an exemplary embodiment of the disclosed technology; Figure 4 This is a schematic cross-sectional view of a fixed frame according to an exemplary embodiment of the disclosed technology; Figure 5 This is a schematic cross-sectional view of a filter plate according to an exemplary embodiment of the disclosed technology; Figure 6This is a schematic cross-sectional view of a collection frame according to an exemplary embodiment of the disclosed technology; Figure 7 This is a schematic diagram illustrating a rotating plate and a limiting plate according to an exemplary embodiment of the disclosed technology.

[0019] Figure label: 1. Sedimentation tank; 2. Sludge filter press; 3. Sludge pump; 4. Hydraulic rod; 5. Filter plate; 6. Fixing frame; 7. Air injection device; 8. Filter cloth; 9. Rubber diaphragm; 10. Fixing rod; 11. Trapezoidal frame; 12. Sealing plate; 13. Trapezoidal plate; 14. Sliding rod; 15. Triangular plate; 161. L-shaped sliding plate; 162. Fixing plate; 163. Long plate; 164. L-shaped rod; 165. Trapezoidal sliding plate; 166. Round rod; 167. Rotating plate; 168. Limiting plate; 171. Collection frame; 172. Triangular frame; 173. Push rod; 174. Rotating plate; 175. Sliding plate; 176. Short plate; 177. Connecting rope. Detailed Implementation

[0020] The technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments.

[0021] Please see Figure 1 - Figure 5 One embodiment of the present invention is: a sludge reduction device for urban sewage treatment plants, comprising: a sedimentation tank 1, a sludge filter press 2 arranged on the right side of the sedimentation tank 1, a sludge pump 3 arranged between the sedimentation tank 1 and the sludge filter press 2, a hydraulic rod 4 arranged on the inner wall of the sludge filter press 2, a filter plate 5 slidably installed at the output end of the hydraulic rod 4, a fixed frame 6 fixedly installed on the inner wall of the sludge filter press 2, a fixed rod 10 fixedly installed on the top of the inner wall of the filter plate 5, a trapezoidal frame 11 slidably installed on the top of the inner wall of the fixed frame 6, a sealing plate 12 fixedly installed on the surface of the trapezoidal frame 11, a trapezoidal plate 13 fixedly installed on the top of the sludge filter press 2, a sliding rod 14 slidably installed on the surface of the filter plate 5, a triangular plate 15 fixedly installed at the bottom of the sliding rod 14, and a drain pipe connected to the bottom of the filter plate 5. The downward displacement of the triangular plate 15 assists in pushing the sludge residue inside the filter cloth 8, effectively preventing the sludge residue from getting stuck inside the filter plate 5, and avoiding the problems of reduced sludge treatment volume and reduced treatment efficiency in the future.

[0022] The filter plate 5 is lined with filter cloth 8 on its inner wall, the fixed frame 6 is lined with rubber diaphragm 9 on its inner wall, the fixed frame 6 is equipped with an air injection device 7 on its top, a first spring is provided between the fixed frame 6 and the trapezoidal frame 11, and the trapezoidal frame 11 is reset by the elastic force of the first spring, a second spring is provided between the filter plate 5 and the sliding rod 14, and the sliding rod 14 is reset by the elastic force of the second spring, and a reset spring is provided between the hydraulic rod 4 and the filter plate 5, and the filter plate 5 is reset by the elastic force of the reset spring.

[0023] A method for reducing sludge volume in a municipal wastewater treatment plant sludge reduction device includes the following steps: Step 1: First, the hydraulic rod 4 drives the filter plate 5 to move closer to the fixed frame 6, so that the filter plate 5 seals the fixed frame 6. Then, the sludge settled at the bottom of the sedimentation tank 1 is pumped into the space between the filter plate 5 and the fixed frame 6 by the sludge pump 3. Then, high-pressure gas is introduced into the cavity between the fixed frame 6 and the rubber diaphragm 9 by the air injection device 7, so that the rubber diaphragm 9 expands and squeezes the sludge towards the filter cloth 8. Water flows out through the filter cloth 8, while the sludge solids are intercepted and retained, so that the sludge remains between the rubber diaphragm 9 and the filter cloth 8. When the hydraulic rod 4 drives the filter plate 5 to reset, the sludge residue inside the filter plate 5 falls off, realizing the sludge dewatering and cleaning operation. Step 2: Simultaneously, when the filter plate 5 moves toward the fixed frame 6, it drives the fixed rod 10 to move toward the fixed frame 6 in sync. During the movement of the fixed rod 10, it pushes the trapezoidal frame 11 to move away from the fixed rod 10. The movement of the trapezoidal frame 11 drives the sealing plate 12 to move away from the fixed rod 10 in sync. Step 3: Move the sealing plate 12 away from the fixed rod 10 to open the inlet of the sludge pump 3, so that sludge can be pumped normally. When the filter plate 5 moves away from the fixed frame 6 to reset and unload, the sealing plate 12 re-seals the inlet of the sludge pump 3 to prevent the sludge pump 3 from continuously dripping sludge and sewage during the discharge of sludge residue, so as to avoid affecting the overall sludge treatment effect. Step 4: Simultaneously, as the filter plate 5 moves towards the fixed frame 6, it drives the sliding rod 14 to move towards the fixed frame 6 in a synchronized manner. After the sliding rod 14 moves, it contacts the inclined surface of the trapezoidal plate 13. Guided by the inclined surface of the trapezoidal plate 13, the sliding rod 14 and the triangular plate 15 move upward. When the filter plate 5 moves away from the fixed frame 6 to reset and unload, the sliding rod 14 loses its support and automatically resets under the elastic force of the second spring. The sliding rod 14 moves downward and drives the triangular plate 15 to move downward in sync. The downward displacement of the triangular plate 15 assists in pushing the sludge inside the filter cloth 8, effectively preventing the sludge from getting stuck inside the filter plate 5 and avoiding the problems of reduced sludge treatment volume and reduced treatment efficiency in the future.

[0024] In this embodiment, during operation: First, the hydraulic rod 4 moves the filter plate 5 closer to the fixed frame 6, sealing the fixed frame 6 with the filter plate 5. Then, the sludge settled at the bottom of the sedimentation tank 1 is pumped into the space between the filter plate 5 and the fixed frame 6 by the sludge pump 3. Next, high-pressure gas is introduced into the interlayer cavity between the fixed frame 6 and the rubber diaphragm 9 through the air injection device 7. The air pressure in the sealed cavity increases, causing the flexible rubber diaphragm 9 to be pushed outward and bulge, protruding towards one side of the filter plate 5, directly squeezing the sludge cake in the middle of the filter cloth 8, allowing water to pass through the filter. The filter cloth 8 is discharged from the drain pipe, leaving the sludge between the rubber diaphragm 9 and the filter cloth 8. When the hydraulic rod 4 drives the filter plate 5 to reset, the sludge inside the filter plate 5 falls off, realizing the sludge dewatering and cleaning operation. At the same time, when the filter plate 5 moves towards the fixed frame 6, it drives the fixed rod 10 to move towards the fixed frame 6 in sync. During the movement of the fixed rod 10, it pushes the trapezoidal frame 11 to move away from the fixed rod 10. The movement of the trapezoidal frame 11 drives the sealing plate 12 to move away from the fixed rod 10 in sync. The movement of the sealing plate 12 away from the fixed rod 10 opens the inlet of the sludge pump 3, allowing it to pump sludge normally. When the filter plate 5 moves away from the fixed frame 6 to reset and unload, the sealing plate 12 re-seals the inlet of the sludge pump 3 to prevent residual sludge and sewage from continuously dripping from the sludge pump 3 pipeline during the unloading stage. Simultaneously, as the filter plate 5 moves closer to the fixed frame 6, it drives the sliding rod 14 to move towards the fixed frame 6. After moving, the sliding rod 14 contacts the inclined surface of the trapezoidal plate 13, and the inclined surface of the trapezoidal plate 13 guides the sliding rod 14 and the triangular plate 15 to move upward. When the filter plate 5 moves away from the fixed frame 6 to reset and unload, the sliding rod 14 loses support and automatically resets under the elastic force of the second spring. The sliding rod 14 moves downward and drives the triangular plate 15 to move downward simultaneously. The downward displacement of the triangular plate 15 assists in pushing the sludge inside the filter cloth 8, effectively preventing the sludge from getting stuck inside the filter plate 5 and avoiding problems such as reduced sludge treatment capacity and lower treatment efficiency.

[0025] Please see Figure 1 - Figure 7Based on the above embodiments, in another embodiment of the present invention, the sludge filter press 2 is provided with an anti-adhesion device and a recycling device to prevent sludge adhesion. The anti-adhesion device includes an L-shaped slide plate 161, a fixed plate 162, a long plate 163, an L-shaped rod 164, and a trapezoidal slide plate 165. The inner wall of the filter plate 5 is provided with a sliding groove. The L-shaped slide plate 161 is slidably installed on the inner wall of the sliding groove. The fixed plate 162 is fixedly installed on the bottom of the L-shaped slide plate 161. The long plate 163 is fixedly installed on the bottom of the filter plate 5. The L-shaped rod 164 is slidably installed on the bottom of the fixed frame 6. The trapezoidal slide plate 165 is slidably installed on the surface of the fixed frame 6. When the filter plate 5 is processed and moves away from the fixed frame 6, the fixed plate 162 resets and pushes the sludge residue inside the filter cloth 8 to move away from the filter plate 5, preventing the sludge residue from getting stuck on the filter cloth 8 and affecting subsequent filtration.

[0026] A round rod 166 is fixedly installed on the surface of the filter plate 5. A rotating plate 167 is rotatably installed on the inner wall of the sludge filter press 2. A limit plate 168 is fixedly installed on the inner wall of the sludge filter press 2. By moving the filter plate 5 up and down, the sludge residue remaining inside the filter plate 5 is shaken off, thereby improving the cleaning effect of the sludge.

[0027] A No. 3 spring is installed between the L-shaped slide plate 161 and the slide groove. The L-shaped slide plate 161 is reset by the elastic force of the No. 3 spring. A No. 4 spring is installed between the L-shaped rod 164 and the fixed frame 6. The L-shaped rod 164 is reset by the elastic force of the No. 4 spring. A No. 5 spring is installed between the trapezoidal slide plate 165 and the fixed frame 6. The trapezoidal slide plate 165 is reset by the elastic force of the No. 5 spring. A No. 1 torsion spring is installed between the sludge filter press 2 and the rotating plate 167. The rotating plate 167 is reset by the elastic force of the No. 1 torsion spring.

[0028] In this embodiment, the filter plate 5 moves towards the fixed frame 6, causing the L-shaped sliding plate 161 and the fixed plate 162 to move towards the fixed frame 6. When the L-shaped sliding plate 161 contacts the fixed frame 6, the reverse force pushes the L-shaped sliding plate 161 and the fixed plate 162 away from the fixed frame 6. When the filter plate 5 moves away from the fixed frame 6 after processing, the elastic force of the No. 3 spring causes the L-shaped sliding plate 161 and the fixed plate 162 to reset. The reset of the fixed plate 162 pushes the sludge inside the filter cloth 8 away from the filter plate 5, preventing the sludge from getting stuck on the top of the filter cloth 8 and affecting subsequent filtration. Simultaneously, the movement of filter plate 5 towards the fixed frame 6 will cause the long plate 163 to move towards the fixed frame 6. This movement of the long plate 163 will push the L-shaped rod 164 towards the fixed frame 6. The L-shaped rod 164 will then contact the inclined surface of the trapezoidal sliding plate 165, pushing it downwards. When the L-shaped rod 164 reaches its limit position, it will stop the filter plate 5, preventing it from continuing to move towards the fixed frame 6, which could lead to an overly tight seal and affect the equipment's operation. In addition to extending the filter plate's lifespan, when the hydraulic rod 4 drives the filter plate 5 to reset, the filter plate 5 will drive the round rod 166 to reset. During the reset process, the round rod 166 will come into contact with the rotating plate 167. The rotating plate 167 will be limited by the limiting plate 168, causing the round rod 166 to move downward under the pressure of the rotating plate 167. The downward movement of the round rod 166 will drive the filter plate 5 to move downward. When the round rod 166 disengages from the rotating plate 167, the elastic force of the reset spring will drive the filter plate 5 to reset. The up and down movement of the filter plate 5 will shake off the sludge residue inside the filter plate 5, improving the sludge cleaning effect.

[0029] The recycling device includes a collection frame 171, a tripod 172, a push rod 173, and a rotating plate 174. The collection frame 171 is fixedly installed on the inner wall of the sludge filter press 2, the tripod 172 is fixedly installed on the inner wall of the collection frame 171, the push rod 173 is fixedly installed on the bottom of the trapezoidal slide plate 165, and the rotating plate 174 is rotatably installed on the inner wall of the collection frame 171 to achieve a seal on the collection frame 171. This prevents the inlet of the collection frame 171 from being open for a long time when there is untreated sludge, which would cause the odor generated by the sludge inside the collection frame 171 to leak out and affect the working environment.

[0030] A short plate 176 is fixedly installed on the circumferential surface of the rotating plate 174, and a sliding plate 175 is slidably installed on the inner wall of the collection frame 171. A connecting rope 177 is fixedly installed at one end of the short plate 176, and the other end of the connecting rope 177 is fixedly installed on the top of the sliding plate 175 to prevent sludge from accumulating on one side of the collection frame 171, which would cause the sludge to block the feed inlet and affect the subsequent collection of sludge.

[0031] A second torsion spring is provided between the rotating plate 174 and the collecting frame 171. The rotating plate 174 is reset by the elastic force of the second torsion spring. A sixth spring is provided between the collecting frame 171 and the sliding plate 175. The sliding plate 175 is reset by the elastic force of the sixth spring.

[0032] The downward movement of the trapezoidal sliding plate 165 drives the push rod 173 downward, which in turn pushes the rotating plate 174 downward, opening the inlet of the collection frame 171. The sludge accumulated above the rotating plate 174 falls into the collection frame 171. When the filter plate 5 returns to its original position, the elastic force of the second torsion spring causes the rotating plate 174 to return to its original position, sealing the collection frame 171. This prevents the inlet of the collection frame 171 from remaining open for extended periods when there is untreated sludge, thus preventing the leakage of odors from the sludge inside the collection frame 171. This affects the working environment. When the rotating plate 174 rotates downward, it will drive the short plate 176 to rotate upward around the axis. The upward rotation of the short plate 176 will drive the connecting rope 177 to move upward. The upward movement of the connecting rope 177 will pull the sliding plate 175 to move upward. When the rotating plate 174 returns to its original position, the sliding plate 175 will move downward after losing its pull. The up and down movement of the sliding plate 175 will shake the sludge inside to level it, preventing the sludge from accumulating on one side of the collection frame 171, which would block the feed inlet and affect the subsequent collection of sludge.

[0033] The above description is merely a preferred embodiment of this application, but the scope of protection of this application is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in this application, based on the technical solution and application concept of this application, should be included within the scope of protection of this application.

Claims

1. A sludge reduction device for urban wastewater treatment plants, comprising: A sedimentation tank (1), a sludge filter press (2) is provided on the right side of the sedimentation tank (1), and a sludge pump (3) is provided between the sedimentation tank (1) and the sludge filter press (2), characterized in that: The sludge filter press (2) is provided with a hydraulic rod (4) on its inner wall. A filter plate (5) is slidably installed on the output end of the hydraulic rod (4). A fixed frame (6) is fixedly installed on the inner wall of the sludge filter press (2). A fixed rod (10) is fixedly installed on the top of the inner wall of the filter plate (5). A trapezoidal frame (11) is slidably installed on the top of the inner wall of the fixed frame (6). A sealing plate (12) is fixedly installed on the surface of the trapezoidal frame (11). A trapezoidal plate (13) is fixedly installed on the top of the sludge filter press (2). A sliding rod (14) is slidably installed on the surface of the filter plate (5). A triangular plate (15) is fixedly installed at the bottom of the sliding rod (14). A drain pipe is connected to the bottom of the filter plate (5).

2. The sludge reduction device for urban wastewater treatment plants according to claim 1, characterized in that, The filter plate (5) is provided with a filter cloth (8) on its inner wall, the fixed frame (6) is provided with a rubber diaphragm (9) on its inner wall, the fixed frame (6) is provided with an air injection device (7) on its top, a first spring is provided between the fixed frame (6) and the trapezoidal frame (11), a second spring is provided between the filter plate (5) and the sliding rod (14), a reset spring is provided between the hydraulic rod (4) and the filter plate (5), and the sludge filter press (2) is provided with an anti-adhesion device and a recycling device to prevent sludge from adhering inside.

3. The sludge reduction device for urban wastewater treatment plants according to claim 2, characterized in that, The anti-adhesion device includes an L-shaped slide plate (161), a fixed plate (162), a long plate (163), an L-shaped rod (164), and a trapezoidal slide plate (165). The inner wall of the filter plate (5) is provided with a sliding groove. The L-shaped slide plate (161) is slidably installed on the inner wall of the sliding groove. The fixed plate (162) is fixedly installed on the bottom of the L-shaped slide plate (161). The long plate (163) is fixedly installed on the bottom of the filter plate (5). The L-shaped rod (164) is slidably installed on the bottom of the fixed frame (6). The trapezoidal slide plate (165) is slidably installed on the surface of the fixed frame (6).

4. The sludge reduction device for urban wastewater treatment plants according to claim 3, characterized in that, A round rod (166) is fixedly installed on the surface of the filter plate (5), a rotating plate (167) is rotatably installed on the inner wall of the sludge filter press (2), and a limiting plate (168) is fixedly installed on the inner wall of the sludge filter press (2).

5. The sludge reduction device for urban wastewater treatment plants according to claim 4, characterized in that, A No. 3 spring is provided between the L-shaped slide plate (161) and the slide groove, a No. 4 spring is provided between the L-shaped rod (164) and the fixed frame (6), a No. 5 spring is provided between the trapezoidal slide plate (165) and the fixed frame (6), and a No. 1 torsion spring is provided between the sludge filter press (2) and the rotating plate (167).

6. The sludge reduction device for urban wastewater treatment plants according to claim 5, characterized in that, The recycling device includes a collection frame (171), a tripod (172), a push rod (173), and a rotating plate (174). The collection frame (171) is fixedly installed on the inner wall of the sludge filter press (2), the tripod (172) is fixedly installed on the inner wall of the collection frame (171), the push rod (173) is fixedly installed on the bottom of the trapezoidal slide plate (165), and the rotating plate (174) is rotatably installed on the inner wall of the collection frame (171).

7. A sludge reduction device for urban wastewater treatment plants according to claim 6, characterized in that, A short plate (176) is fixedly installed on the circumference of the rotating plate (174), and a sliding plate (175) is slidably installed on the inner wall of the collecting frame (171). A connecting rope (177) is fixedly installed at one end of the short plate (176), and the other end of the connecting rope (177) is fixedly installed on the top of the sliding plate (175).

8. A sludge reduction device for urban wastewater treatment plants according to claim 7, characterized in that, A second torsion spring is provided between the rotating plate (174) and the collecting frame (171), and a sixth spring is provided between the collecting frame (171) and the sliding plate (175).

9. A sludge reduction method for a municipal wastewater treatment plant sludge reduction device, using the municipal wastewater treatment plant sludge reduction device according to claim 8, characterized in that, Includes the following steps: Step 1: First, the filter plate (5) is moved closer to the fixed frame (6) by the hydraulic rod (4) so ​​that the filter plate (5) seals the fixed frame (6). Then, the sludge settled at the bottom of the sedimentation tank (1) is pumped into the space between the filter plate (5) and the fixed frame (6) by the sludge pump (3). Then, high pressure gas is introduced into the interlayer cavity between the fixed frame (6) and the rubber diaphragm (9) by the air injection device (7) so that the rubber diaphragm (9) expands and squeezes the sludge on the side of the filter cloth (8). Water flows out through the filter cloth (8) and the sludge remains between the rubber diaphragm (9) and the filter cloth (5). When the hydraulic rod (4) drives the filter plate (5) to reset, the sludge inside the filter plate (5) falls off, realizing the sludge dewatering and cleaning operation. Step 2: At the same time, when the filter plate (5) moves toward the fixed frame (6), it drives the fixed rod (10) to move toward the fixed frame (6) in sync. During the movement of the fixed rod (10), it pushes the trapezoidal frame (11) to move away from the fixed rod (10). The movement of the trapezoidal frame (11) drives the sealing plate (12) to move away from the fixed rod (10) in sync. Step 3: Move the sealing plate (12) away from the fixed rod (10) to open the inlet of the sludge pump (3) so that sludge can be pumped normally. When the filter plate (5) moves away from the fixed frame (6) to reset and unload, the sealing plate (12) re-seals the inlet of the sludge pump (3) to prevent the sludge pump (3) from continuously dripping sludge and sewage during the discharge of sludge residue, so as to avoid affecting the overall sludge treatment effect. Step 4: When the filter plate (5) moves toward the fixed frame (6) at the same time, it drives the sliding rod (14) to move toward the fixed frame (6) in sync. After the sliding rod (14) moves, it contacts the inclined surface of the trapezoidal plate (13). The inclined surface of the trapezoidal plate (13) guides and pushes the sliding rod (14) and the triangular plate (15) to move upward. When the filter plate (5) moves away from the fixed frame (6) to reset and unload, the sliding rod (14) loses its support and automatically resets under the elastic force of the second spring. The sliding rod (14) moves downward and drives the triangular plate (15) to move downward in sync. The downward displacement of the triangular plate (15) assists in pushing the sludge inside the filter plate (5), effectively preventing the sludge from getting stuck inside the filter plate (5) and avoiding the problems of reduced sludge treatment volume and reduced treatment efficiency in the future.

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