A municipal sewage treatment device and method of use

Abstract

This invention provides a municipal sewage treatment device and its usage method, solving the problems that most municipal sewage pipes are buried underground, making it inconvenient to collect and clean the solid waste filtered out of the pipes. Furthermore, some waste tends to clump together, forming large clumps that not only accumulate at the bottom of the treatment device, causing it to malfunction, but also block the sewage pipes. The invention includes a first sewage pipe pre-buried underground; the first sewage pipe has an L-shaped structure, with a fan-shaped drawer fixed at its bottom end, and a second sewage pipe extending vertically fixed at the bottom of the fan-shaped drawer. By installing a filtration device within the fan-shaped drawer, some solid waste, under the influence of potential energy, flows along the inclined direction of the second filter plate through the sewage pipe and into the collection cage. A conveying mechanism within the fan-shaped drawer conveys the solid waste on the surface of the second filter plate into the collection cage, achieving the purpose of filtering and collecting solid waste from the pipes.

Description

Technical Field

[0001] This invention relates to the field of municipal wastewater treatment, and in particular to a municipal wastewater treatment device and its usage method. Background Technology

[0002] Wastewater treatment is the process of purifying wastewater to meet the water quality requirements for discharge into a water body or for reuse. Taking municipal wastewater as an example, it is generally collected by urban pipe networks and treated at urban wastewater treatment plants before being discharged into water bodies.

[0003] Municipal sewage contains a large amount of organic matter, bacteria, and viruses, and often contains silt. While the stones in the silt will settle to the bottom of the water under the influence of gravity, the mud, branches, and other debris in the sewage are difficult to settle to the bottom when the water is flowing. During sewage filtration, small mud pieces often clog the filter screen, affecting the filtration effect.

[0004] In the prior art, such as the invention patent with patent number 202310556693.1, a municipal sewage treatment device and its usage method are disclosed. The device includes a connecting pipe installed on a sewage pipeline, and a separator is installed inside the connecting pipe. The separator includes notches on both sides of the connecting pipe surface, and a fan-shaped drawer is installed in each notch. The drawer body on one side inside the connecting pipe is aligned with the horizontal plane. This invention can achieve the continuous filtration of solid waste from sewage, preventing solid waste from clogging the water holes and affecting the sewage treatment effect. However, most municipal sewage pipelines are buried underground, making it inconvenient to collect and clean the solid waste filtered out of the pipeline. Furthermore, some waste may clump together to form large volumes of solid waste, which not only accumulates at the bottom of the treatment device, causing it to malfunction, but also clogs the sewage pipeline. Summary of the Invention

[0005] In order to address the problems in the background art where most municipal sewage pipes are buried underground, making it inconvenient to collect and clean the solid waste filtered out of the pipes, and when the solid waste is large in volume, it is easy to accumulate at the bottom of the treatment device, causing the treatment device to malfunction and also clogging the sewage pipes, this invention proposes a municipal sewage treatment device and its usage method.

[0006] The technical solution of the present invention is: a municipal sewage treatment device, comprising a first sewage pipe pre-buried underground;

[0007] The first sewage pipe has an L-shaped pipe structure. A fan-shaped drawer is fixedly installed at the bottom of the first sewage pipe, and a second sewage pipe extending in the vertical direction is fixedly installed at the bottom of the fan-shaped drawer.

[0008] The fan drawer has a cylindrical structure and a drain pipe is fixed on it. The drain pipe is inclined from left to right and from top to bottom and is connected to the fan drawer. The bottom end of the drain pipe is connected to the middle of the drain well that extends in the vertical direction. The top of the drain well is flush with the ground and a manhole cover is detachably fixed at the opening at the top of the drain well. A collection cage that can be raised and lowered is installed inside the drain well. The collection cage has a cylindrical mesh structure with an opening at the top and the opening of the collection cage is located below the bottom outlet of the drain pipe.

[0009] A sedimentation well extending in the front-to-back direction is fixedly installed at the bottom of the sewage well. The sedimentation well is connected to the sewage well. The diameter of the sedimentation well gradually decreases from top to bottom. A connecting pipe is fixedly installed on the outer circumference of the top of the sedimentation well and is connected to the sedimentation well. The end of the connecting pipe away from the sedimentation well is fixedly installed on the second sewage pipe and is connected to the second sewage pipe.

[0010] The first sewage pipe is equipped with a cutting device inside the vertical pipe. The cutting device is used to cut solid waste in the sewage. The cutting device includes multiple annular shells fixedly installed inside the vertical pipe of the first sewage pipe. The multiple annular shells are spaced apart along the circumference of the vertical pipe of the first sewage pipe. The annular shells are equipped with cutting blades with the blades facing upward.

[0011] The fan drawer is equipped with a filter device to filter out solid waste from the first sewage pipe and discharge it into the collection cage. The filter device includes a second filter plate fixedly installed in the fan drawer. The second filter plate is inclined from left to right and from top to bottom, and the bottom end of the second filter plate is fixed to the bottom end of the inner wall of the sewage pipe. The second filter plate has multiple through slots that are spaced apart in the front-back direction and are open from top to bottom.

[0012] A conveying mechanism is fixedly installed inside the fan drawer. The conveying mechanism is used to convey solid waste from the surface of the second filter plate into the collection cage.

[0013] The top of the sewage well is equipped with a lifting device, which is used to lift and lower the collection cage.

[0014] Preferably, the annular housing has an annular mounting space, and the annular mounting space has a buffer mechanism to buffer the force of solid waste impacting the cutting blade.

[0015] The buffer mechanism includes a first stop fixedly disposed inside the annular housing, a second stop slidably disposed inside the annular housing, and a spring disposed between the first stop and the second stop;

[0016] A rotating ring is provided inside the annular shell. The first stop is slidably connected to the rotating ring, and the second stop is fixedly connected to the rotating ring.

[0017] An arc-shaped groove is provided on the circumferential side of the annular shell, and the cutting blade passes through the arc-shaped groove and is fixed on the rotating ring.

[0018] Preferably, the feeding mechanism includes a fixed shaft fixedly installed inside the fan drawer, a rotating roller fixedly sleeved on the fixed shaft, and a plurality of first filter plates fixedly installed on the rotating roller at intervals along its circumferential direction. The first filter plates include a plurality of rods at intervals in the front-back direction, and the rods can pass through the through groove when rotating.

[0019] Preferably, the lifting device includes an electric hoist installed in the ground, with a housing fixedly fitted on the electric hoist. The housing is buried in the ground, and the top of the housing is flush with the ground.

[0020] The top of the inner wall of the sewage well is fixedly equipped with a support, and a pulley is rotatably mounted on the support. The hoisting cable of the electric hoist passes around the pulley and is fixed to the bottom of the collection cage.

[0021] Preferably, the inner wall of the sewage well is provided with multiple grooves arranged along its circumference. The multiple grooves extend in the vertical direction, and guide sliders that can slide up and down are provided on the grooves. The lifting cable of the electric hoist is fixed on the guide slider.

[0022] The bottom of the collection cage is fixed with multiple support rods, and the bottom ends of the support rods are fixed on the guide slider.

[0023] A limit block is fixed at the bottom of the trough rail to limit the descent height of the collection cage.

[0024] Preferably, a check valve is fixedly installed inside the connecting pipe to prevent sewage in the second sewage pipe from flowing back into the sedimentation well.

[0025] Preferably, the bottom of the sedimentation well is equipped with a sludge pumping device, which is used to pump out the sludge in the sedimentation well;

[0026] The mud pumping device includes a mud pipe fixed at the bottom of the settling well, and the settling well is connected to the mud pipe. A mud pump is fixed at the end of the mud pipe away from the settling well, and the mud outlet of the mud pump extends out of the ground.

[0027] Preferably, the top of the sewage well is equipped with a drainage mechanism to assist in the discharge of rainwater from the urban surface;

[0028] The drainage mechanism includes an arc-shaped cylinder fixedly installed on the outer circumferential surface of the top of the sewage well. The arc-shaped cylinder extends along the circumferential direction of the sewage well, and the top of the arc-shaped cylinder is flush with the ground. Multiple filter holes are opened at intervals along its circumference on the top of the arc-shaped cylinder. A U-shaped pipe is fixedly installed at the bottom of the arc-shaped cylinder, and the U-shaped pipe is connected to the interior of the arc-shaped cylinder. The end of the U-shaped pipe away from the arc-shaped cylinder is fixedly installed on the sewage well, and the U-shaped pipe is connected to the sewage well.

[0029] Preferably, the top of the collection cage is provided with a conical wing plate, which is located below the bottom outlet of the sewage pipe. The diameter of the conical wing plate gradually increases from bottom to top, and the outer diameter of the top of the conical wing plate is the same as the inner diameter of the sewage well. Multiple second slots are provided on the conical wing plate, which are evenly distributed along its circumference and are open from top to bottom.

[0030] The conical wing plate has a third slot for the hoisting cable to pass through, and a fourth slot for the rail to pass through.

[0031] A method of using a municipal wastewater treatment device includes the following steps:

[0032] S1 - When sewage containing solid waste enters the vertical pipe of the first sewage pipe, under the action of potential energy, the solid waste impacts the blade of the cutting blade and is divided and broken by multiple cutting blades;

[0033] S2 - After the crushed solid waste enters the fan drawer with the sewage, the sewage passes through the through groove in the second filter plate and enters the second sewage pipe. The solid waste is intercepted in the fan drawer by the second filter plate.

[0034] S3 - Some solid waste, under the action of potential energy, passes through the sewage pipe along the inclined direction of the second filter plate and enters the collection cage. At the same time, when the sewage flows through the fan drawer, it impacts the first filter plate from top to bottom and pushes the rotating roller and multiple first filter plates to rotate, pushing the solid waste on the side of the second filter plate and in the fan drawer through the sewage pipe into the collection cage.

[0035] S4 - Some of the sewage and sludge that enter the collection cage along with the solid waste are affected by their own gravity and enter the sedimentation well. The sludge sinks to the bottom of the sedimentation well, and after the sewage in the sedimentation well is higher than the connecting pipe, the sewage in the sedimentation well enters the second sewage pipe through the connecting pipe and is discharged.

[0036] S5 - Start the mud pump at regular intervals to extract the sludge from the bottom of the sedimentation well through the mud pipe for processing and reuse;

[0037] S6 - Open the manhole cover at a set time, start the electric hoist, and remove the collection cage containing solid waste from the sedimentation well for processing.

[0038] Advantages of the present invention: The present invention, by setting a filter device in the fan drawer, allows some solid waste to pass through the sewage pipe and enter the collection cage under the action of potential energy along the inclined direction of the second filter plate. By setting a conveying mechanism in the fan drawer, the solid waste on the surface of the second filter plate is conveyed to the collection cage, thereby achieving the purpose of filtering and collecting solid waste in the pipeline.

[0039] The collection cage has an open-top cylindrical mesh structure, which can filter out moisture and silt from the surface of the collected solid waste, reducing the weight and volume of the solid waste and facilitating subsequent solid waste processing.

[0040] By installing a sedimentation well and connecting pipe at the bottom of the sewage discharge well, the sewage that enters the collection cage along with solid waste and the sewage filtered off the surface of the solid waste can be returned to the sewage pipeline system where the second sewage pipe is located. At the same time, the sewage discharge well can settle the sludge in the sewage before the sewage is returned to the second sewage pipe, reducing the sludge content in the sewage pipeline system and increasing the flow rate of sewage in the sewage pipeline system.

[0041] By installing multiple cutting devices inside the vertical pipe of the first sewage pipe, when sewage containing solid waste enters the vertical pipe of the first sewage pipe, the solid waste impacts the blades of the cutting blades under the action of potential energy, and is divided and broken by multiple cutting blades, preventing the solid waste from becoming too large and causing blockage after entering the fan drawer with the sewage. Attached Figure Description

[0042] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0043] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0044] Figure 2 This is a cross-sectional view of the overall structure of the present invention;

[0045] Figure 3 This is a schematic diagram of the slitting device of the present invention;

[0046] Figure 4 This is a cross-sectional view of the annular shell of the present invention;

[0047] Figure 5 This is a schematic diagram of the structure of the dialing mechanism of the present invention;

[0048] Figure 6 This is a schematic diagram of the lifting device of the present invention. Figure 1 ;

[0049] Figure 7 This is a schematic diagram of the lifting device of the present invention. Figure 2 ;

[0050] Figure 8 This is a schematic diagram of the structure of the collection cage of the present invention.

[0051] In the diagram: 1. First sewage pipe; 2. Fan-shaped drawer; 3. Second sewage pipe; 4. Sewage pipe; 5. Sewage well; 6. Well cover; 7. Collection cage; 8. Cutting device; 801. Annular shell; 802. Cutting blade; 803. First stop block; 804. Second stop block; 805. Spring; 806. Rotating ring; 901. Rotating roller; 902. First filter plate; 903. Second filter plate; 101. Electric hoist; 102. Shell; 105. Pulley; 106. Track rail; 107. Guide slider; 108. Support rod; 109. Limiting block; 11. Conical wing plate; 12. Connecting pipe; 13. Sedimentation well; 14. Mud pipe; 15. Mud pump; 16. Arc-shaped cylinder; 17. U-shaped pipe. Detailed Implementation

[0052] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0053] Example 1: A municipal wastewater treatment device, such as Figure 1-8 As shown, the system includes a first sewage pipe 1 pre-buried underground. The first sewage pipe 1 has an L-shaped pipe structure. A fan-shaped drawer 2 is fixedly installed at the bottom of the first sewage pipe 1. A second sewage pipe 3 extending vertically is fixedly installed at the bottom of the fan-shaped drawer 2. The fan-shaped drawer 2 has a cylindrical structure. A sewage pipe 4 is fixedly installed on the fan-shaped drawer 2. Specifically, the sewage pipe 4 is connected to the fan-shaped drawer 2. The sewage pipe 4 is inclined from left to right and from top to bottom to facilitate the downward discharge of solid waste. The bottom of the sewage pipe 4 is connected to the middle of a sewage well 5 extending vertically. The top of the sewage well 5 is flush with the ground. A well cover 6 is detachably fixed at the opening at the top of the sewage well 5. A collection cage 7 that can be raised and lowered and can collect solid waste is installed inside the sewage well 5. Specifically, the collection cage 7 has an open cylindrical mesh structure. The opening of the collection cage 7 is located below the bottom outlet of the sewage pipe 4 to facilitate the collection of solid waste discharged from the sewage pipe 4.

[0054] The first sewage pipe 1 is equipped with a cutting device 8 that can cut solid waste in sewage. Specifically, the cutting device 8 includes multiple annular shells 801 fixedly installed in the vertical pipe of the first sewage pipe 1. The multiple annular shells 801 are spaced apart along the circumference of the vertical pipe of the first sewage pipe 1. The annular shells 801 are equipped with cutting blades 802 with the blades of the cutting blades 802 facing upward.

[0055] The cutting device 8 is equipped with a buffer mechanism that can buffer the force generated when solid waste impacts the cutting blade 802. Specifically, the buffer mechanism includes a first stop 803 fixedly installed inside the annular housing 801, a second stop 804 slidably installed inside the annular housing 801, and a spring 805 between the first stop 803 and the second stop 804; a rotating ring 806 is rotatably installed inside the annular housing 801, the first stop 803 is slidably connected to the rotating ring 806, and the second stop 804 is fixedly connected to the rotating ring 806; an arc-shaped groove is opened on the circumferential side of the annular housing 801, and the cutting blade 802 passes through the arc-shaped groove and is fixedly installed on the rotating ring 806.

[0056] When solid waste impacts the cutting blade 802, the cutting blade 802 can divide and break up the solid waste. At the same time, the cutting blade 802 moves downward due to the impact force of the solid waste. When the impact force on the cutting blade 802 is lower than the force exerted on the cutting blade 802 by the spring 805 through the second stop 804, the cutting blade 802 resets. When solid waste adheres to or wraps around the surface of the cutting blade 802, the cutting blade 802 is washed by sewage, causing it to move downward. This makes the direction of extension of the cutting blade 802 the same as the direction of water flow, which facilitates the washing away of the solid waste adhering to or wrapping around the surface of the cutting blade 802 and prevents blockage of the sewage pipe.

[0057] The drawer 2 is equipped with a filter device that can filter solid waste from the first sewage pipe 1 and discharge it into the collection cage 7. Specifically, the filter device includes a second filter plate 903 fixedly installed in the drawer 2. The second filter plate 903 has multiple through slots that are spaced apart in the front-back direction and are open from top to bottom. The second filter plate 903 is inclined from left to right and from top to bottom, and the bottom end of the second filter plate 903 is fixedly installed on the bottom end of the inner wall of the sewage pipe 4, so that solid waste can pass through the sewage pipe 4 and directly enter the collection cage 7 under the action of potential energy along the inclined direction of the second filter plate 903.

[0058] The drawer 2 is equipped with a conveying mechanism that can convey solid waste on the surface of the second filter plate 903 to the collection cage 7. Specifically, the conveying mechanism includes a fixed shaft fixedly installed in the drawer 2, a rotating roller 901 fixedly sleeved on the fixed shaft, and a plurality of first filter plates 902 spaced apart along its circumferential direction fixedly installed on the rotating roller 901. The first filter plate 902 includes a plurality of rods spaced apart in the front-back direction, and the rods can pass through the through groove when rotating.

[0059] The top of the sewage well 5 is equipped with a lifting device that can drive the collection cage 7 to rise and fall. Specifically, the lifting device includes an electric hoist 101 installed in the ground. A housing 102 is fixedly fitted on the electric hoist 101. The housing 102 is buried in the ground and the top of the housing 102 is flush with the ground. A support is fixedly installed on the top of the inner wall of the sewage well 5. A pulley 105 is rotatably installed on the support. The sling of the electric hoist 101 passes around the pulley 105 and is fixed to the bottom of the collection cage 7.

[0060] The inner wall of the sewage well 5 is provided with multiple circumferentially arranged grooves 106, which extend vertically. Guide sliders 107 that can slide up and down are provided on the grooves 106, and the sling of the electric hoist 101 is fixed on the guide sliders 107. Multiple support rods 108 are fixed at the bottom of the collection cage 7, and the bottom ends of the support rods 108 are fixed on the guide sliders 107. The support rods 108 have a certain length, which allows the collection cage 7 to rise above the top opening of the sewage well 5 when the electric hoist 101 drives the guide sliders 107 to slide, without the guide sliders 107 disengaging from the grooves 106, so as to facilitate the cleaning of solid waste in the collection cage 7.

[0061] A limiting block 109 is fixedly provided at the bottom end of the trough rail 106. The limiting block 109 is used to limit the descent height of the collection cage 7. The limiting block 109 can limit the descent height of the collection cage 7, and at the same time, the limiting block 109 can bear the weight of the collection cage 7, so that the electric hoist 101 does not need to pull the collection cage 7 for a long time.

[0062] The bottom of the sewage well 5 is fixedly provided with a sedimentation well 13, which can settle the sludge in the sewage. Specifically, the sedimentation well 13 extends in the front-to-back direction and is connected to the sewage well 5. The bottom diameter of the sedimentation well 13 gradually decreases from top to bottom.

[0063] The sedimentation well 13 is equipped with a connecting pipe 12 that can discharge the internal sewage back into the sewage pipeline system. Specifically, the connecting pipe 12 is fixedly installed on the top outer circumference of the sedimentation well 13 and is connected to the sedimentation well 13. The end of the connecting pipe 12 away from the sedimentation well 13 is fixedly installed on the second sewage pipe 3 and is connected to the second sewage pipe 3. A check valve is fixedly installed inside the connecting pipe 12 to prevent the sewage in the second sewage pipe 3 from flowing back into the sedimentation well 13.

[0064] The bottom of the sedimentation well 13 is fixedly equipped with a mud pumping device that can pump out and clean the sludge in the sedimentation well 13. Specifically, the mud pumping device includes a mud pipe 14 fixedly installed at the bottom of the sedimentation well 13, and the sedimentation well 13 is connected to the mud pipe 14. A mud pump 15 is fixedly installed at the end of the mud pipe 14 away from the sedimentation well 13, and the mud outlet of the mud pump 15 extends out of the ground.

[0065] The top of the sewage well 5 is equipped with a drainage mechanism to assist in the discharge of rainwater from the urban ground. Specifically, the drainage mechanism includes an arc-shaped cylinder 16 fixedly installed on the outer circumference of the top of the sewage well 5. The arc-shaped cylinder 16 extends along the circumferential direction of the sewage well 5, and the top of the arc-shaped cylinder 16 is flush with the ground. The top of the arc-shaped cylinder 16 has multiple filter holes spaced apart along its circumference, allowing rainwater to pass through the filter holes and enter the arc-shaped cylinder 16, while blocking solid waste outside the arc-shaped cylinder 16 to prevent blockage. A U-shaped pipe 17 is fixedly installed at the bottom of the arc-shaped cylinder 16, and the U-shaped pipe 17 is connected to the interior of the arc-shaped cylinder 16. The end of the U-shaped pipe 17 away from the arc-shaped cylinder 16 is fixedly installed on the sewage well 5, and the U-shaped pipe 17 is connected to the sewage well 5. A certain amount of water can be accumulated inside the U-shaped pipe 17 to prevent the odor generated by solid waste in the sewage well 5 from escaping to the outside.

[0066] The top of the collection cage 7 is provided with a conical wing plate 11 that can guide solid waste into the collection cage 7. Specifically, the conical wing plate 11 is located below the bottom outlet of the sewage pipe 4. The diameter of the conical wing plate 11 gradually increases from bottom to top, and the outer diameter of the top of the conical wing plate 11 is the same as the inner diameter of the sewage well 5. Multiple second slots are opened on the conical wing plate 11, which are evenly distributed along its circumference and are open from top to bottom, so that rainwater can enter the sewage well 5 through the drainage mechanism and can directly enter the sedimentation well 13 through the second slots, thus preventing rainwater from directly entering the solid waste in the collection cage 7.

[0067] A method of using a municipal wastewater treatment device includes the following steps:

[0068] S1 - When sewage containing solid waste enters the vertical pipe of the first sewage pipe 1, under the action of potential energy, the solid waste impacts the blade of the cutting blade 802 and is divided and broken by multiple cutting blades 802.

[0069] S2 - After the crushed solid waste enters the fan drawer 2 with the sewage, the sewage passes through the through groove in the second filter plate 903 and enters the second sewage pipe 3. The solid waste is intercepted in the fan drawer 2 by the second filter plate 903.

[0070] S3 - Some solid waste, under the action of potential energy, flows along the inclined direction of the second filter plate 903 through the sewage pipe 4 and enters the collection cage 7. At the same time, when the sewage flows through the fan drawer 2, it impacts the first filter plate 902 from top to bottom and pushes the rotating roller 901 and multiple first filter plates 902 to rotate, pushing the solid waste on the side of the second filter plate 903 and in the fan drawer 2 through the sewage pipe 4 into the collection cage 7.

[0071] S4~Part of the sewage and sludge that enter the collection cage 7 along with the solid waste are affected by their own gravity and enter the sedimentation well 13. The sludge sinks to the bottom of the sedimentation well 13. After the sewage in the sedimentation well 13 is higher than the connecting pipe 12, the sewage in the sedimentation well 13 enters the second sewage pipe 3 through the connecting pipe 12 and is discharged.

[0072] S5 - Start the mud pump 15 at regular intervals to extract the sludge from the bottom of the sedimentation well 13 through the mud pipe 14 for processing and reuse;

[0073] S6 - Open the manhole cover 6 at a set time, start the electric hoist 101, and remove the collection cage 7 containing solid waste from the sedimentation well 13 for processing.

[0074] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims and not by the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. A municipal sewage treatment plant, characterised in that: Including the first sewage pipe (1) pre-buried underground; The first sewage pipe (1) has an L-shaped pipe structure. A fan-shaped drawer (2) is fixedly installed at the bottom of the first sewage pipe (1). A second sewage pipe (3) extending in the vertical direction is fixedly installed at the bottom of the fan-shaped drawer (2). The fan drawer (2) is a cylindrical structure. A drain pipe (4) is fixedly installed on the fan drawer (2). The drain pipe (4) is inclined from left to right and from top to bottom. The drain pipe (4) is connected to the fan drawer (2). The bottom end of the drain pipe (4) is connected to the middle part of the drain well (5) extending in the vertical direction. The top end of the drain well (5) is flush with the ground. A well cover (6) is detachably fixed at the opening at the top of the drain well (5). A collection cage (7) that can be raised and lowered is installed inside the drain well (5). The collection cage (7) is a cylindrical mesh structure with an upper opening. The opening of the collection cage (7) is located below the bottom outlet of the drain pipe (4). A sedimentation well (13) extending in the front-to-back direction is fixedly provided at the bottom of the sewage well (5). The sedimentation well (13) is connected to the sewage well (5). The diameter of the sedimentation well (13) gradually decreases from top to bottom. A connecting pipe (12) is fixedly provided on the outer circumference of the top of the sedimentation well (13). The connecting pipe (12) is connected to the sedimentation well (13). The end of the connecting pipe (12) away from the sedimentation well (13) is fixedly provided on the second sewage pipe (3). The connecting pipe (12) is connected to the second sewage pipe (3). The first sewage pipe (1) is equipped with a cutting device (8) inside the vertical pipe. The cutting device (8) is used to cut solid waste in sewage. The cutting device (8) includes multiple annular shells (801) fixedly installed inside the vertical pipe of the first sewage pipe (1). The multiple annular shells (801) are spaced apart along the circumference of the vertical pipe of the first sewage pipe (1). The annular shells (801) are equipped with cutting blades (802), and the blades of the cutting blades (802) face upward. The drawer (2) is equipped with a filter device to filter out solid waste from the first sewage pipe (1) and discharge it into the collection cage (7). The filter device includes a second filter plate (903) fixedly installed in the drawer (2). The second filter plate (903) is inclined from left to right and from top to bottom, and the bottom end of the second filter plate (903) is fixedly installed on the bottom end of the inner wall of the sewage pipe (4). The second filter plate (903) has multiple through slots that are spaced apart in the front-back direction and are open from top to bottom. A conveying mechanism is fixedly installed inside the fan drawer (2). The conveying mechanism is used to convey the solid waste on the surface of the second filter plate (903) into the collection cage (7). The top of the sewage well (5) is equipped with a lifting device, which is used to lift the collection cage (7) up and down; The annular housing (801) has an annular installation space inside, and a buffer mechanism is provided inside the annular installation space. The buffer mechanism buffers the force of solid waste hitting the cutting blade (802). The buffer mechanism includes a first stop (803) fixedly disposed inside the annular housing (801), a second stop (804) slidably disposed inside the annular housing (801), and a spring (805) disposed between the first stop (803) and the second stop (804). A rotating ring (806) is rotatably provided inside the annular shell (801). The first stop (803) is slidably connected to the rotating ring (806), and the second stop (804) is fixedly connected to the rotating ring (806). An arc-shaped groove is provided on the circumferential side of the annular shell (801), and the cutting blade (802) passes through the arc-shaped groove and is fixed on the rotating ring (806).

2. The municipal sewage treatment device according to claim 1, characterized in that: The feeding mechanism includes a fixed shaft fixedly installed inside the fan drawer (2), a rotating roller (901) fixedly sleeved on the fixed shaft, and a plurality of first filter plates (902) fixedly installed on the rotating roller (901) at intervals along its circumferential direction. The first filter plate (902) includes a plurality of rods at intervals in the front-back direction, and the rods can pass through the through slot when rotating.

3. The municipal sewage treatment device according to claim 1, characterized in that: The lifting device includes an electric hoist (101) installed in the ground, and a housing (102) is fixedly fitted on the electric hoist (101). The housing (102) is buried in the ground, and the top of the housing (102) is flush with the ground. A support is fixedly installed on the top of the inner wall of the sewage well (5), and a pulley (105) is rotatably installed on the support. The hoisting cable of the electric hoist (101) passes around the pulley (105) and is fixedly installed at the bottom of the collection cage (7).

4. A municipal sewage treatment plant according to claim 3, characterised in that: The inner wall of the sewage well (5) is provided with multiple grooves (106) arranged along its circumference. The multiple grooves (106) extend in the vertical direction. The grooves (106) are provided with guide sliders (107) that can slide up and down. The sling of the electric hoist (101) is fixed on the guide sliders (107). The bottom of the collection cage (7) is fixedly provided with multiple support rods (108), and the bottom end of the support rods (108) is fixedly provided on the guide slider (107); A limiting block (109) is fixedly provided at the bottom end of the trough (106) to limit the descent height of the collection cage (7).

5. The municipal sewage treatment device according to claim 1, characterized in that: A check valve is fixedly installed inside the connecting pipe (12) to prevent sewage in the second sewage pipe (3) from flowing back into the sedimentation well (13).

6. A municipal sewage treatment plant as claimed in claim 1, wherein: The bottom of the sedimentation well (13) is equipped with a sludge pumping device, which is used to pump out the sludge in the sedimentation well (13); The mud pumping device includes a mud pipe (14) fixed at the bottom of the sedimentation well (13), and the sedimentation well (13) is connected to the mud pipe (14). A mud pump (15) is fixed at one end of the mud pipe (14) away from the sedimentation well (13), and the mud outlet of the mud pump (15) extends out of the ground.

7. A municipal wastewater treatment device according to claim 1, characterized in that: The top of the sewage well (5) is equipped with a drainage mechanism, which is used to assist in the discharge of rainwater on the urban ground. The drainage mechanism includes an arc-shaped cylinder (16) fixedly installed on the outer circumferential surface of the top of the sewage well (5). The arc-shaped cylinder (16) extends along the circumferential direction of the sewage well (5). The top of the arc-shaped cylinder (16) is flush with the ground. The top of the arc-shaped cylinder (16) is provided with multiple filter holes spaced apart along its circumference. The bottom of the arc-shaped cylinder (16) is fixedly provided with a U-shaped pipe (17). The U-shaped pipe (17) is connected to the interior of the arc-shaped cylinder (16). The end of the U-shaped pipe (17) away from the arc-shaped cylinder (16) is fixedly installed on the sewage well (5) and is connected to the sewage well (5).

8. A municipal wastewater treatment device according to claim 1, characterized in that: The top of the collection cage (7) is provided with a conical wing plate (11). The conical wing plate (11) is located below the bottom outlet of the sewage pipe (4). The diameter of the conical wing plate (11) gradually increases from bottom to top, and the outer diameter of the top of the conical wing plate (11) is the same as the inner diameter of the sewage well (5). Multiple second slots are evenly distributed along its circumference and are open from top to bottom on the conical wing plate (11). The conical wing plate (11) has a third slot for the hoisting cable (103) to pass through, and the conical wing plate (11) has a fourth slot for the rail (106) to pass through.

9. A method of using a municipal wastewater treatment device according to claims 1-8, comprising the following steps: When sewage containing solid waste enters the vertical pipe of the first sewage pipe (1) in S1, under the action of potential energy, the solid waste hits the blade of the cutting knife (802) and is divided and broken by multiple cutting knives (802); S2 - After the crushed solid waste enters the fan drawer (2) along with the sewage, the sewage passes through the through groove in the second filter plate (903) and enters the second sewage pipe (3). The solid waste is intercepted in the fan drawer (2) by the second filter plate (903). S3~Some solid waste, under the action of potential energy, flows along the inclined direction of the second filter plate (903) through the sewage pipe (4) and enters the collection cage (7). At the same time, when the sewage flows through the fan drawer (2), it impacts the first filter plate (902) from top to bottom and pushes the rotating roller (901) and multiple first filter plates (902) to rotate, pushing the solid waste on the side of the second filter plate (903) and in the fan drawer (2) through the sewage pipe (4) into the collection cage (7). S4~Part of the sewage and sludge that enter the collection cage (7) along with the solid waste are affected by their own gravity and enter the sedimentation well (13). The sludge sinks to the bottom of the sedimentation well (13). After the sewage in the sedimentation well (13) is higher than the connecting pipe (12), the sewage in the sedimentation well (13) enters the second sewage pipe (3) through the connecting pipe (12) and is discharged. S5 - Start the mud pump (15) at regular intervals to extract the sludge at the bottom of the sedimentation well (13) through the mud pipe (14) for processing and reuse; S6 - Open the well cover (6) at a set time, start the electric hoist (101), and take out the collection cage (7) with solid waste from the sedimentation well (13) for processing.

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