Sewage purification system

Abstract

The present invention relates to a sewage purification system, comprising: a grit chamber, a sand discharge port being formed at the bottom of the grit chamber; a controller, the controller being disposed outside the grit chamber; a driving assembly, the driving assembly being fixed to the inner wall of the grit chamber through a mounting frame and being electrically connected to the controller, the driving assembly being capable of outputting bidirectional power in clockwise and counterclockwise directions; and a dredging actuator, the dredging actuator being drivingly connected to the driving assembly, and the dredging actuator comprising a first dredging arm and a second dredging arm, the first dredging arm and the second dredging arm being capable of alternately inserting into or withdrawing from the sand discharge port. Along with the continuous operation of the first dredging arm and the second dredging arm, it is very difficult for sediment to accumulate and block the sand discharge port, ensuring that the settled sediment can be normally and reliably discharged from the sand discharge port, ensuring the normal progress of the sand-water separation work, and ensuring the normal operation of the water purification plant.

Description

Technical Field

[0001] The invention relates to the technical field of sewage purification and treatment, and in particular to a sewage purification system. Background Art

[0002] At present, water purification plants are used to purify domestic or industrial sewage, so as to circulate clean tap water for people's use. Sewage will inevitably be mixed with mud and sand during migration, flow and collection. If the mud and sand in the sewage are not separated and removed by sedimentation in advance, it will affect the operation of subsequent treatment equipment. The most important of these effects are wear of pumps, blockage of pipe networks, interference and even destruction of biochemical treatment processes. Generally speaking, grit chambers are mainly used to remove sand particles with a particle size greater than 0.2mm and a density greater than 2.65t / cubic meter in sewage to protect pipes, valves and other facilities from wear and blockage. Its working principle is based on gravity separation. By controlling the water inlet flow rate of the grit chamber, inorganic particles with a large specific gravity can sink by themselves, while organic suspended particles can flow away with the water.

[0003] However, for most of the current water purification plants, the sand-water separator circulation system with a sand settling tank is generally used for sand settling work, and the working method is to suck sand once an hour, each time for 15 minutes. However, due to factors such as insufficient suction, small pipe diameter, and large sand and water treatment volume, the sand discharge pipe is prone to blockage, resulting in the inability to effectively carry out the sand and water separation work, which seriously affects the normal production and operation of the water purification plant. Summary of the invention

[0004] Based on this, it is necessary to provide a sewage purification system, which aims to solve the problem that mud and sand block the sand discharge port in the prior art and the sand and water separation work cannot be carried out normally.

[0005] The present application provides a sewage purification system, including a sand settling tank and a reciprocating rod insertion device;

[0006] The bottom of the grit chamber is provided with a sand discharge port; the side wall of the grit chamber is provided with a sewage inlet, and the side wall of the grit chamber is also provided with a drain port, the axis of the sewage inlet is staggered with the axis of the grit chamber, so that the sand-water mixed medium flows along a circular path in the grit chamber; the drain port and the sewage inlet are distributed in an annular direction, and along the flow direction of the sewage in the grit chamber, the drain port is located downstream of the sewage inlet;

[0007] The reciprocating insertion rod device includes a controller, a driving component, and a dredging actuator. The controller is arranged outside the grit chamber. The driving component is fixed on the inner wall of the grit chamber through a mounting frame and is electrically connected to the controller. The driving component can output bidirectional power in clockwise and counterclockwise directions. The dredging actuator is drivingly connected to the driving component, and the dredging actuator includes a first dredging arm and a second dredging arm. The first dredging arm and the second dredging arm can alternately insert into or withdraw from the sand discharge port.

[0008] When the sewage purification system is working, sewage continuously flows into the grit chamber. The sand and silt mixed in the sewage will settle by themselves under the action of their own weight and finally discharge from the sand discharge port of the grit chamber. If the sewage flow is very large during some periods, or the sand and silt particles in the sewage are large and sticky, it is easy to cause untimely sand discharge, and the sand and silt accumulate at the sand discharge port and block the sand discharge port.

[0009] At this time, the controller controls the driving component to start operating. The driving component can periodically and alternately output clockwise rotation power and counterclockwise rotation power. Since the dredging actuator is drivingly connected to the driving component, the first dredging arm and the second dredging arm can alternately insert into or withdraw from the sand discharge port. That is, when the driving component outputs clockwise rotation power, the first dredging arm inserts into the sand discharge port and the second dredging arm withdraws from the sand discharge port. At this time, the first dredging arm plays a role in loosening and dredging the sand and silt blocked at the sand discharge port. Similarly, when the driving component outputs counterclockwise rotation power, the first dredging arm withdraws from the sand discharge port and the second dredging arm inserts into the sand discharge port. At this time, the second dredging arm can continue to play a role in loosening and dredging the sand and silt blocked at the sand discharge port. Thus, with the continuous operation of the first dredging arm and the second dredging arm, it is very difficult for the sand and silt to accumulate and block the sand discharge port, ensuring that the settled sand and silt can be normally and reliably discharged from the sand discharge port, ensuring the normal operation of the sand-water separation work, and the normal operation of the water purification plant.

[0010] In one embodiment, the driving component includes a motor, a reducer, a coupling, and a driving wheel. The motor is fixed on the mounting frame. The reducer is connected to the motor. The reducer is connected to the coupling. The driving wheel is connected to the coupling. The first dredging arm and the second dredging arm are arranged opposite to each other at intervals on the rim of the driving wheel.

[0011] In one embodiment, the dredging actuator further includes a mounting body. The mounting body is wound around the outside of the driving wheel. The first dredging arm is connected to the first end of the mounting body. The second dredging arm is connected to the second end of the mounting body.

[0012] In one embodiment, an abrasion-increasing layer is provided on the inner side surface of the mounting body facing the driving wheel. The abrasion-increasing layer is pressed against the wheel surface of the driving wheel.

[0013] In one embodiment, a first tooth structure is provided on the inner side of the installation body facing the driving wheel, a second tooth structure is provided on the wheel surface of the driving wheel, and the first tooth structure meshes with the second tooth structure.

[0014] In one embodiment, the ends of the first dredging arm and the second dredging arm close to the sand discharge port are formed into a tapered structure.

[0015] In one embodiment, it further includes a first support guide frame and a second support guide frame. The first support guide frame and the second support guide frame are respectively arranged on the inner wall of the grit chamber, and both the first support guide frame and the second support guide frame include a support rod, a support sliding ring and a rolling body. The support sliding ring is arranged at the end of the support rod, the rolling body is rotatably arranged in a rolling groove preset on the inner ring wall of the support sliding ring, and both the first dredging arm and the second dredging arm pass through the inner ring cavity of the support sliding ring and are in rolling contact with the rolling body.

[0016] In one embodiment, the reciprocating moving plugging rod device further includes a vibration motor and a vibrating rod. The vibration motor is arranged at the ends of the first dredging arm and the second dredging arm, the vibrating rod is drivingly connected to the vibration motor, and the vibrating rod can be inserted into or withdrawn from the sand discharge port.

[0017] In one embodiment, the reciprocating moving plugging rod device further includes a rotary cylinder and a rotary screw. The rotary cylinder is arranged at the ends of the first dredging arm and the second dredging arm, the rotary screw is drivingly connected to the rotary cylinder, and the rotary screw can be inserted into or withdrawn from the sand discharge port. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The drawings constituting a part of this application are used to provide a further understanding of the present invention. The schematic embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation to the present invention.

[0019] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0020] Figure 1 It is a schematic structural diagram of the reciprocating moving plugging rod device according to an embodiment of the present invention.

[0021] Description of the reference numerals:

[0022] 10. Sand settling tank; 11. Sand discharge port; 12. Sewage inlet; 13. Drain port; 20. Driving assembly; 30. Cleaning execution member; 31. First cleaning arm; 32. Second cleaning arm; 33. Installation main body; 40. First support guide; 50. Second support guide; 51. Support rod; 52. Support sliding ring; 53. Rolling body; 60. Rotary cylinder; 70. Rotary screw; 80. Sand discharge pipe; 90. Sand pumping pump. Detailed implementation manners

[0023] To make the above objects, features, and advantages of the present invention more obvious and understandable, the following will describe the detailed implementation manners of the present invention with reference to the accompanying drawings. Many specific details are set forth in the following description to fully understand the present invention. However, the present invention can be implemented in many other ways different from those described herein. Those skilled in the art can make similar improvements without departing from the connotation of the present invention. Therefore, the present invention is not limited by the specific embodiments disclosed below.

[0024] The embodiment of the present application provides a sewage purification system, and the sewage purification system is, for example, a complete set of equipment for realizing sewage purification treatment in a water purification plant. According to actual needs, the sewage purification system can work by using biological purification methods, physical purification methods, or chemical purification schemes, which are not specifically limited herein.

[0025] Since it is inevitable for sewage to mix with sediment during the processes of migration, flow, and collection. If the sediment in the sewage is not removed by sedimentation separation in advance, it will affect the operation of subsequent treatment equipment. For example, larger sediment particles will cause serious wear and even scrapping of pumps; or the sediment will cause blockage of pipe networks; or the sediment will interfere with or even damage the biochemical treatment process, etc. Based on this, a reciprocating moving plug device is provided in the sewage purification system to separate and remove the sediment in the sewage to avoid the above problems.

[0026] As Figure 1 shown, a reciprocating moving plug device shown in an embodiment of the present application includes: a sand settling tank 10, a controller, a driving assembly 20, and a cleaning execution member 30. The sand settling tank 10 is set as a structure made of brick and concrete, usually buried underground to avoid occupying ground space. The sand settling tank 10 is used as the front-stage process of the purification process to separate sand and water from sewage to remove sediment particles in the sewage. For example, in this embodiment, the sand settling tank 10 is in a conical cylinder shape.

[0027] Please continue to refer to Figure 1The side wall of the grit chamber 10 is provided with a sewage inlet 12, the side wall of the grit chamber 10 is also provided with a drain port 13, and the bottom of the grit chamber 10 is provided with a sand outlet 11. The axis of the sewage inlet 12 is staggered with the axis of the grit chamber 10 so that the sand-water mixed medium flows along a circular path in the grit chamber 10. By such an arrangement, the sand-water mixed medium (i.e., sewage) flowing into the grit chamber 10 can flow a longer path in the grit chamber 10, so that the mud and sand have enough time to settle more fully, which is helpful to separate the mud and sand in the sewage.

[0028] Please continue reading Figure 1 The drain port 13 and the sewage inlet 12 are distributed in the annular direction, and along the flow direction of the sewage in the grit chamber 10, the drain port 13 is located downstream of the sewage inlet 12. Therefore, after the sewage flows in the grit chamber 10 for one circle, the slightly cleaner sewage after the sedimentation and removal of the mud and sand can be quickly discharged from the drain port 13 downstream, avoiding occupying the space of the grit chamber 10 and causing impact and interference to the mud and sand mixed medium that subsequently flows into the grit chamber 10, thereby helping to increase the sewage treatment capacity.

[0029] Furthermore, a filter is installed at the drain outlet 13. The filter can block the residual mud and sand particles in the sewage that have not been completely separated from the sand, so as to prevent them from flowing out of the sand settling tank 10, causing wear on the pump and clogging the pipe network. It can be understood that the filter is a mesh plate with multiple mesh holes arranged in an array. According to actual needs, one filter can be set, or two or more filters can be set in sequence along the water flow direction.

[0030] In addition, in order to further accelerate the discharge of mud and sand from the sand discharge port 11, the sand discharge port 11 is also connected to a sand discharge pipe 80, and a sand pump 90 is connected to the sand discharge pipe 80. When the sand pump 90 is working, it can generate suction force in the sand discharge pipe 80, thereby accelerating the mud and sand to pass through the sand discharge port 11 and reducing the probability of blockage.

[0031] The controller is arranged outside the grit chamber 10. For example, the controller may be a PLC, a numerical control system, a microcontroller, etc.

[0032] Please continue reading Figure 1 The driving component 20 is fixed to the inner wall of the sand settling tank 10 through a mounting frame and is electrically connected to the controller. The driving component 20 can output clockwise and counterclockwise bidirectional power; the dredging actuator 30 is drivingly connected to the driving component 20, and the dredging actuator 30 includes a first dredging arm 31 and a second dredging arm 32. The first dredging arm 31 and the second dredging arm 32 can be alternately inserted into or withdrawn from the sand discharge port 11.

[0033] When the sewage purification system is working, sewage continuously flows into the grit chamber 10. The sand and silt mixed in the sewage will settle by their own weight and finally be discharged from the sand discharge port 11 out of the grit chamber 10. If the sewage flow rate is very large during some periods, or the sand and silt particles in the sewage are large and sticky, it is easy to cause untimely sand discharge, and the sand and silt accumulate at the sand discharge port 11 and block the sand discharge port 11.

[0034] At this time, the controller controls the driving assembly 20 to start operating. The driving assembly 20 can periodically alternately output clockwise rotation power and counterclockwise rotation power. Since the dredging actuator 30 is drivingly connected to the driving assembly 20, the first dredging arm 31 and the second dredging arm 32 can alternately insert into or withdraw from the sand discharge port 11. That is, when the driving assembly 20 outputs clockwise rotation power, the first dredging arm 31 inserts into the sand discharge port 11 and the second dredging arm 32 withdraws from the sand discharge port 11. At this time, the first dredging arm 31 plays a role in loosening and dredging the sand and silt blocked at the sand discharge port 11; similarly, when the driving assembly 20 outputs counterclockwise rotation power, the first dredging arm 31 withdraws from the sand discharge port 11 and the second dredging arm 32 inserts into the sand discharge port 11. At this time, the second dredging arm 32 can continue to play a role in loosening and dredging the sand and silt blocked at the sand discharge port 11. Thus, with the continuous operation of the first dredging arm 31 and the second dredging arm 32, it is very difficult for the sand and silt to accumulate and block the sand discharge port 11, ensuring that the settled sand and silt can be normally and reliably discharged from the sand discharge port 11, ensuring the normal operation of the sand-water separation work, and the normal operation of the water purification plant.

[0035] In some embodiments, the driving assembly 20 includes a motor, a reducer, a coupling and a driving wheel. The motor is fixed to the mounting frame. The reducer is connected to the motor. The reducer is connected to the coupling. The driving wheel is connected to the coupling. The first dredging arm 31 and the second dredging arm 32 are arranged opposite to each other at intervals on the rim of the driving wheel. When it is necessary to dredge and prevent blockage of the sand discharge port 11, the motor starts to output rotational power. The reducer decelerates the power output by the motor and at the same time increases the torque. The coupling further transmits the rotational power to the driving wheel. The driving wheel first rotates clockwise, driving the first dredging arm 31 to insert into the sand discharge port 11 to form a dredging effect on the sand and silt; then the driving wheel rotates counterclockwise, the first dredging arm 31 withdraws and the second dredging arm 32 seamlessly inserts into the sand discharge port 11, always keeping the sand and silt in the sand discharge port 11 loose to prevent accumulation and blockage.

[0036] Please continue to refer to Figure 1, Further, the dredging actuator 30 further includes an installation body 33. The installation body 33 is wound around the outside of the driving wheel. The first dredging arm 31 is connected to the first end of the installation body 33, and the second dredging arm 32 is connected to the second end of the installation body 33. Since the outer contour of the driving wheel is arc-shaped, the installation body 33 can adapt to this arc shape and be assembled around the outer surface of the driving wheel, enabling both the first dredging arm 31 and the second dredging arm 32 to face the sand discharge port 11. Thus, when the driving wheel rotates, the first dredging arm 31 and the second dredging arm 32 can move in a straight-line trajectory to insert and extract from the sand discharge port 11, improving the dredging efficiency and ensuring the accuracy of the first dredging arm 31 and the second dredging arm 32 inserting and extracting from the sand discharge port 11.

[0037] Optionally, the installation body 33 can be a semi-closed ring body made of materials such as metal and hard plastic, and its inner ring contour is adapted to the outer contour of the driving wheel.

[0038] It can be understood that in the above embodiment, the driving wheel drives the installation body 33 to rotate together through friction, thereby driving the first dredging arm 31 and the second dredging arm 32 to move. In order to avoid the resistance and reaction force of the mud and sand during the insertion and extraction, causing the installation body 33 to slip on the driving wheel and affecting the dredging effect, further, an anti-slip layer is provided on the inner side surface of the installation body 33 facing the driving wheel, and the anti-slip layer is pressed against the wheel surface of the driving wheel. The anti-slip layer can increase the friction between the installation body 33 and the driving wheel, thereby preventing slipping and strengthening the dredging ability of the first dredging arm 31 and the second dredging arm 32 on the mud and sand at the sand discharge port 11.

[0039] Alternatively, as an alternative solution to the above embodiment, a first tooth structure is provided on the inner side surface of the installation body 33 facing the driving wheel, and a second tooth structure is provided on the wheel surface of the driving wheel. The first tooth structure meshes with the second tooth structure. Using the first tooth structure and the second tooth structure to mesh can also ensure that the installation body 33 reliably rotates synchronously and in the same direction as the driving wheel, effectively driving the first dredging arm 31 and the second dredging arm 32 to alternately insert and extract from the sand discharge port 11 to prevent blockage problems.

[0040] Preferably, the ends of the first dredging arm 31 and the second dredging arm 32 close to the sand discharge port 11 are formed into a tapered structure. Since the sediment is generally solid particles with a relatively large particle size, such as small gravel, etc., and has a certain hardness, and after the sediment coagulates into blocks, the hardness will be further improved. By designing and manufacturing the ends of the first dredging arm 31 and the second dredging arm 32 into a tapered shape, it can be more easily inserted into the accumulated and blocked sediment. And as the insertion depth increases, the first dredging arm 31 and the second dredging arm 32 with a larger diameter can exert a squeezing and pushing effect on the sediment, causing the sediment particles to move relative to each other, breaking the force balance state of the blocked sediment pile, so that the sediment can follow the water flow through the sand discharge port 11 to achieve the dredging effect.

[0041] Please continue to refer to Figure 1 , in addition, on the basis of any of the above embodiments, it further includes a first support guide frame 40 and a second support guide frame 50. The first support guide frame 40 and the second support guide frame 50 are respectively arranged on the inner wall of the grit chamber 10, and the first support guide frame 40 and the second support guide frame 50 both include a support rod 51, a support sliding ring 52 and a rolling body 53. The support sliding ring 52 is arranged at the end of the support rod 51, and the rolling body 53 is rotatably arranged in a rolling groove preset on the inner ring wall of the support sliding ring 52. The first dredging arm 31 and the second dredging arm 32 both pass through the inner ring cavity of the support sliding ring 52 and are in rolling contact with the rolling body 53.

[0042] The first support guide frame 40 and the second support guide frame 50 can respectively play a guiding and supporting role for the first dredging arm 31 and the second dredging arm 32, which helps to increase the stiffness of the first dredging arm 31 and the second dredging arm 32, so as to dredge the sediment more reliably. The rolling body 53 pre-installed on the inner ring wall of the support sliding ring 52 can reduce the frictional resistance to the first dredging arm 31 and the second dredging arm 32, and thus reduce the load loss of the motor.

[0043] Further, on the basis of any of the above embodiments, the reciprocating moving plug rod device further includes a vibration motor and a vibrating rod. The vibration motor is arranged at the ends of the first dredging arm 31 and the second dredging arm 32, and the vibrating rod is drivingly connected to the vibration motor. The vibrating rod can insert into or withdraw from the sand discharge port 11. When the first dredging arm 31 or the second dredging arm 32 inserts into the sand discharge port 11, the vibration motor synchronously drives the vibrating rod to generate vibration, and the vibrating rod plays a role in vibrating and loosening the sediment flowing through the sand discharge port 11, so as to further prevent the sediment from accumulating and blocking, and ensure the reliable progress of sand-water separation.

[0044] Please continue to refer to Figure 1, or, as an alternative to the above embodiments, the reciprocating insertion rod device further includes a rotary cylinder 60 and a rotary screw 70. The rotary cylinder 60 is disposed at the ends of the first dredging arm 31 and the second dredging arm 32. The rotary screw 70 is drivingly connected to the rotary cylinder 60, and the rotary screw 70 can be inserted into or withdrawn from the sand discharge port 11. After the first dredging arm 31 or the second dredging arm 32 is inserted into the sand discharge port 11, the rotary cylinder 60 drives the rotary screw 70 to rotate. The rotary screw 70 also plays a role in spirally loosening and pushing the sediment flowing through the sand discharge port 11, thereby accelerating the passage of sediment particles through the sand discharge port 11 and simultaneously playing a certain role in crushing the sediment particles, and further fundamentally preventing the occurrence of blockage problems.

[0045] The technical features of the above embodiments can be combined arbitrarily. For the sake of brevity of description, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, it should be considered as the scope described in this specification.

[0046] The above embodiments only represent several implementation manners of the present invention. The description is relatively specific and detailed, but it should not be construed as a limitation on the scope of the invention patent. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present invention, several modifications and improvements can be made, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the present invention patent should be subject to the appended claims.

[0047] In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation on the present invention.

[0048] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one of such features. In the description of the present invention, "a plurality" means at least two, such as two, three, etc., unless otherwise specifically defined.

[0049] In the present invention, unless otherwise clearly stipulated and defined, the terms "installed", "connected", "joined", "fixed", etc. shall be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the internal communication between two components or the interaction relationship between two components, unless otherwise clearly defined. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0050] In the present invention, unless otherwise clearly stipulated and defined, the first feature being "on" or "under" the second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature being "above", "over" and "on top of" the second feature may mean that the first feature is directly above or obliquely above the second feature, or merely indicates that the first feature has a higher horizontal height than the second feature. The first feature being "under", "below" and "beneath" the second feature may mean that the first feature is directly below or obliquely below the second feature, or merely indicates that the first feature has a lower horizontal height than the second feature.

[0051] It should be noted that when an element is referred to as "fixed to" or "disposed on" another element, it can be directly on the other element or there may also be an intermediate element. When an element is considered to be "connected" to another element, it can be directly connected to the other element or there may be an intermediate element at the same time. The terms "vertical", "horizontal", "up", "down", "left", "right" and similar expressions used herein are only for the purpose of illustration and do not represent the only implementation.

Claims

1. A sewage purification system, characterized in that, It includes a grit chamber and a reciprocating moving plug rod device; A sand discharge port is formed at the bottom of the grit chamber; a sewage inlet is formed on the side wall of the grit chamber, and a drainage port is also formed on the side wall of the grit chamber. The axis of the sewage inlet intersects and is staggered with the axis of the grit chamber so that the sand-water mixed medium flows along an annular path in the grit chamber; the drainage port and the sewage inlet are distributed circumferentially, and along the flowing direction of the sewage in the grit chamber, the drainage port is downstream of the sewage inlet. The reciprocating moving plug rod device includes a controller, a driving component, and a dredging execution component. The controller is arranged outside the grit chamber; the driving component is fixed on the inner wall of the grit chamber through a mounting frame and is electrically connected to the controller. The driving component can output bidirectional power in the clockwise and counterclockwise directions; the dredging execution component is drivingly connected to the driving component, and the dredging execution component includes a first dredging arm and a second dredging arm, and the first dredging arm and the second dredging arm can alternately insert into or withdraw from the sand discharge port.

2. The sewage purification system according to claim 1, wherein, The driving component includes a motor, a reducer, a coupling, and a driving wheel. The motor is fixed to the mounting frame, the reducer is connected to the motor, the reducer is connected to the coupling, and the driving wheel is connected to the coupling; the first dredging arm and the second dredging arm are arranged oppositely at intervals on the rim of the driving wheel.

3. The sewage purification system according to claim 2, characterized in that, The dredging execution component further includes a mounting body, the mounting body is wound around the outside of the driving wheel, the first dredging arm is connected to the first end of the mounting body, and the second dredging arm is connected to the second end of the mounting body.

4. The sewage purification system according to claim 3, wherein An abrasion-increasing layer is arranged on the inner side surface of the mounting body facing the driving wheel, and the abrasion-increasing layer is pressed against the wheel surface of the driving wheel.

5. The sewage purification system according to claim 3, wherein, A first tooth structure is arranged on the inner side surface of the mounting body facing the driving wheel, and a second tooth structure is arranged on the wheel surface of the driving wheel, and the first tooth structure meshes with the second tooth structure.

6. The sewage purification system according to claim 1, wherein, The ends of the first dredging arm and the second dredging arm close to the sand discharge port are formed into a tapered structure.

7. The sewage purification system according to any one of claims 1 to 6, characterized in that, The reciprocating moving plug rod device further includes a first support guide frame and a second support guide frame. The first support guide frame and the second support guide frame are respectively arranged on the inner wall of the grit chamber, and both the first support guide frame and the second support guide frame include a support rod, a support sliding ring, and a rolling body. The support sliding ring is arranged at the end of the support rod, the rolling body is rotatably arranged in a rolling groove preset on the inner ring wall of the support sliding ring, and both the first dredging arm and the second dredging arm pass through the inner ring cavity of the support sliding ring and are in rolling contact with the rolling body.

8. The sewage purification system according to any one of claims 1 to 6, characterized in that, The reciprocating moving plug rod device further includes a vibration motor and a vibrating rod. The vibration motor is arranged at the ends of the first dredging arm and the second dredging arm, the vibrating rod is drivingly connected to the vibration motor, and the vibrating rod can insert into or withdraw from the sand discharge port.

9. The sewage purification system according to any one of claims 1 to 6, characterized in that, The reciprocating insertion rod device further includes a rotary cylinder and a rotary screw. The rotary cylinder is arranged at the ends of the first dredging arm and the second dredging arm. The rotary screw is drivingly connected to the rotary cylinder, and the rotary screw can be inserted into or withdrawn from the sand discharge port.

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