Sewage purification system

Abstract

The invention discloses a sewage purification system, and relates to the field of sewage treatment devices. A sewage purification system comprises a purification box, a treatment box and a sorting box are arranged in the purification box from top to bottom, and the sewage purification system further comprises a filtering assembly installed in the treatment box and used for filtering sewage entering the treatment box; the sorting assembly is mounted in the sorting box, and the sorting assembly is used for sorting particles in the filtered sewage; according to the method, no chemical agents such as flocculants and coagulant aids need to be added, particle sorting is achieved only through the physical and mechanical effect, extra costs such as agent purchasing and sludge disposal are avoided, meanwhile, physical sorting does not damage the particle purity, the recycled particles can be directly used for recycling, and the resource value is further improved.

Description

Technical Field

[0001] This invention belongs to the technical field of wastewater treatment devices, and more specifically, relates to a wastewater purification system. Background Technology

[0002] In the field of wastewater treatment and particle recycling, the large number of recyclable particles contained in wastewater (such as metal particles and quartz sand in industrial wastewater, and construction sand and organic debris in municipal wastewater) are important renewable resources.

[0003] Current methods for sorting and recycling these types of particles mainly rely on two technological approaches: Settling and stratification: Wastewater containing large particulate impurities after filtration is settled using equipment such as sedimentation tanks and settling tanks. The density difference between particles and water is used to achieve natural sedimentation and stratification. This method does not require complex equipment, but the sorting efficiency is extremely low. The settling time is usually 4 to 12 hours, and it is easily affected by the viscosity of wastewater and particle agglomeration, resulting in poor stratification and failing to meet the needs of large-scale treatment and efficient recycling. At the same time, sticky impurities are prone to precipitate and clump during the settling process, making subsequent cleaning difficult.

[0004] Flocculant-assisted sorting: Flocculants (such as PAC and PAM) are added to wastewater to cause fine and dispersed particles to aggregate into large flocs, which are then separated by sedimentation or filtration. While this method can improve the separation efficiency of fine particles, it requires continuous purchase of chemical agents, leading to increased treatment costs. Furthermore, flocculant residues may cause secondary pollution, and the resulting chemical-containing sludge is difficult and costly to dispose of, while also compromising the original purity of the particles and affecting their subsequent resource recovery value.

[0005] Therefore, the industry urgently needs a particle recovery technology that does not rely on chemical agents, is low in cost, and has efficient sorting and anti-clogging functions, so as to achieve low-cost, high-value recovery of recyclable particles from wastewater. Summary of the Invention

[0006] The technical problem to be solved by the present invention is to overcome the shortcomings of the prior art and provide a wastewater treatment device that can overcome or at least partially solve the above problems.

[0007] To solve the above-mentioned technical problems, the basic concept of the technical solution adopted by the present invention is: a wastewater purification system, including a purification tank, wherein a treatment tank and a sorting tank are arranged from top to bottom inside the purification tank, and further comprising: A filter assembly is installed inside the treatment tank, and the filter assembly is used to filter the wastewater entering the treatment tank; A sorting component is installed inside the sorting box, and the sorting component is used to sort particles in the filtered wastewater. The sorting assembly includes a telescopic motor, a mounting plate, and a sorting plate. The telescopic motor is fixedly connected inside the sorting box, and the mounting plate is fixedly connected to the telescopic end of the telescopic motor. The sorting plate is mounted on the mounting plate, and a conveyor belt is rotatably connected inside the sorting plate. A partition is fixedly connected to the sorting plate, and the partition is in contact with the upper surface of the conveyor belt.

[0008] Furthermore, a telescopic cylinder is rotatably connected to the mounting plate, and the sorting plate is rotatably connected to the telescopic end of the telescopic cylinder. The tilt angle of the sorting plate can be adjusted through the telescopic cylinder.

[0009] Furthermore, a servo motor is fixedly connected to the sorting plate, and the output end of the servo motor is connected to the conveyor belt for rotating the conveyor belt.

[0010] Furthermore, the sorting plate is fixedly connected to cleaning components at both ends of the conveyor belt.

[0011] Furthermore, the cleaning assembly includes a base plate, a housing, a sliding rod, and a scraper. The base plate is detachably mounted on the sorting plate. Multiple sets of housings are fixedly connected to the base plate at equal intervals. The sliding rod is slidably connected to the housing. The scraper is fixedly connected to the sliding rod and abuts against the conveyor belt. A spring is installed inside the housing, and the other end of the sliding rod is connected to the spring.

[0012] Furthermore, the filtration assembly includes partition plates, solenoid valves, and filter screens. Multiple sets of partition plates are fixedly connected at equal intervals inside the treatment tank. The solenoid valves are installed on the partition plates and are used to control the discharge of sewage through the partition plates. The filter screens are installed between two adjacent sets of partition plates, and the filter holes on the filter screens gradually decrease in size from top to bottom.

[0013] Furthermore, a connecting pipe is installed on the outlet of the solenoid valve located on the bottom partition plate, and the liquid outlet end of the connecting pipe is located on the sorting plate.

[0014] Furthermore, multiple sets of piston cylinders are fixedly connected to the inner wall of the purification box, and an air outlet pipe is connected to the air outlet end of each piston cylinder. Multiple sets of air outlets are connected to the air outlet pipe, and the air outlets are located between two adjacent sets of partition plates.

[0015] Furthermore, a pressure sensor and a laser particle sensor are respectively installed in the processing box and the sorting box, and an electric control valve is installed in the air outlet. The pressure sensor is used to detect the water pressure in two adjacent sets of partition plates, and the laser particle sensor is used to detect the amount of particles on the conveyor belt.

[0016] Furthermore, multiple sets of collection and discharge pipes are fixedly connected inside the sorting box, and the collection and discharge pipes are used to collect and discharge the sorted liquid and particles flowing out of the conveyor belt respectively.

[0017] After adopting the above technical solution, the present invention has the following beneficial effects compared with the prior art: The present invention does not require the addition of any flocculants, coagulants or other chemical agents, and achieves particle sorting only through physical and mechanical action, avoiding additional costs such as agent procurement and sludge disposal. At the same time, physical sorting does not damage the purity of the particles, and the recovered particles can be directly used for recycling, further enhancing the value of resources. Attached Figure Description

[0018] In the attached diagram: Figure 1 This is a schematic diagram of the structure of a wastewater purification system proposed in this invention; Figure 2 This is a schematic cross-sectional view of a wastewater purification system proposed in this invention. Figure 1 ; Figure 3 This is a schematic cross-sectional view of a wastewater purification system proposed in this invention. Figure 2 ; Figure 4 This invention proposes a wastewater purification system. Figure 3 A schematic diagram of the structure of part A; Figure 5 This is a schematic diagram of the structure of a sorting plate, piston cylinder, and air outlet pipe in a wastewater purification system proposed in this invention; Figure 6 This invention proposes a wastewater purification system. Figure 5 A structural diagram of section B; Figure 7 This is a schematic diagram of the structure of a piston cylinder, an air outlet pipe, and a mounting plate in a wastewater purification system proposed in this invention; Figure 8 This invention proposes a wastewater purification system. Figure 7 A structural diagram of section C; Figure 9 This invention proposes a wastewater purification system. Figure 7 A structural diagram of section D; Figure 10 This is a schematic diagram of the structure of the mounting plate, telescopic cylinder, sorting plate, and conveyor belt in a wastewater purification system proposed in this invention.

[0019] In the diagram: 1. Purification box; 101. Processing box; 102. Sorting box; 201. Divider plate; 202. Solenoid valve; 203. Filter screen; 204. Connecting pipe; 301. Telescopic motor; 302. Mounting plate; 303. Telescopic cylinder; 401. Sorting plate; 402. Servo motor; 403. Conveyor belt; 404. Partition bar; 501. Base plate; 502. Housing; 503. Sliding rod; 504. Scraper bar; 601. Piston cylinder; 602. Air outlet pipe; 701. Laser particle sensor; 702. Pressure sensor; 8. Collection and discharge pipe. Detailed Implementation

[0020] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments will be clearly and completely described below with reference to the accompanying drawings. The following embodiments are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0021] Example: Refer to Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 , Figure 10 A wastewater purification system includes a purification tank 1, within which a treatment tank 101 and a sorting tank 102 are arranged from top to bottom. The system also includes: A filter assembly is installed inside the treatment tank 101. The filter assembly is used to filter the wastewater entering the treatment tank 101. The sorting component is installed inside the sorting box 102. The sorting component is used to sort particles in the filtered wastewater. Specifically, the filtration unit is used to filter out larger impurities in wastewater, resulting in finer particles. These particulate impurities can then be sorted by the sorting unit and subsequently recycled for reuse.

[0022] The sorting assembly includes a telescopic motor 301, a mounting plate 302, and a sorting plate 401. The telescopic motor 301 is fixedly connected inside the sorting box 102. The mounting plate 302 is fixedly connected to the telescopic end of the telescopic motor 301. The sorting plate 401 is mounted on the mounting plate 302. A conveyor belt 403 is rotatably connected inside the sorting plate 401. A spacer 404 is fixedly connected to the sorting plate 401. The spacer 404 is in contact with the upper surface of the conveyor belt 403. Specifically, the spacer 404 is uniformly fixed on the surface of the sorting plate 401 along the length of the sorting plate 401, and the lower surface of the spacer 404 is closely attached to the upper surface of the conveyor belt 403 to form multiple sets of dynamic sorting grooves (groove width 2~8mm, depth 3~6mm). The sorting plate 401 is set at an angle. When the filtered wastewater flows onto the sorting plate 401, the telescopic motor 301 causes the sorting plate 401 to make an asymmetrical reciprocating motion of "fast forward and slow backward". This motion generates inertial force, which in turn sorts the particles in the wastewater. During the sorting process, some sticky particles will remain between the spacers 404. At this time, the conveyor belt 403 rotates to transport the adhering particles, so that the relatively clean surface of the conveyor belt 403 comes into contact with the sewage, which facilitates sorting.

[0023] Furthermore, such as Figure 1 As shown, the purification box 1 is a closed box, and a control panel is fixedly installed on its outer wall. The control panel integrates the control system and the display panel. The control system is based on a PLC controller, with pre-stored control programs. It can receive signals from various sensors and output control commands to realize automated control of components such as telescopic motor 301, servo motor 402, solenoid valve 202, piston cylinder 601, and electric control valve. It also supports manual mode switching. The display panel uses a 10-inch touch screen, which can display in real time the water pressure data of each filter chamber detected by the pressure sensor 702, the particle size / density distribution data detected by the laser particle sensor 701, the rotation direction and speed of the conveyor belt 403, the tilt angle of the sorting plate 401, the on / off status of the solenoid valve 202, the working status of the piston cylinder 601, and other information. It also has fault alarm (such as filter screen 203 blockage, motor abnormality) and parameter setting (such as sorting mode, cleaning cycle) functions.

[0024] A telescopic cylinder 303 is rotatably connected to the mounting plate 302. The sorting plate 401 is rotatably connected to the telescopic end of the telescopic cylinder 303. The tilt angle of the sorting plate 401 can be adjusted through the telescopic cylinder 303.

[0025] A servo motor 402 is fixedly connected to the sorting plate 401. The output end of the servo motor 402 is connected to the conveyor belt 403 for the rotation of the conveyor belt 403.

[0026] Cleaning components are fixedly connected to both ends of the conveyor belt 403 on the sorting plate 401.

[0027] Furthermore, such as Figure 7 , Figure 8 , Figure 9As shown, the cleaning assembly includes a base plate 501, a housing 502, a sliding rod 503, and a scraper 504. The base plate 501 is detachably mounted on the sorting plate 401. Multiple housings 502 are fixedly connected to the base plate 501 at equal intervals. The sliding rod 503 is slidably connected to the housing 502. The scraper 504 is fixedly connected to the sliding rod 503 and abuts against the conveyor belt 403. A spring is installed inside the housing 502, and the other end of the sliding rod 503 is connected to the spring.

[0028] Specifically, the cleaning assembly is used to remove sticky impurities adhering to the conveyor belt 403, including a base plate 501, a housing 502, a sliding rod 503, and a scraper 504. The base plate 501 is detachably installed at both ends of the sorting plate 401 by bolts. Multiple housings 502 are fixed at equal intervals to the upper surface of the base plate 501. The sliding rod 503 is slidably connected to the inside of the housing 502 in the vertical direction. The scraper 504 is fixed to the top of the sliding rod 503, and the upper surface of the scraper 504 is in close contact with the lower surface of the conveyor belt 403. A spring is installed inside the housing 502. One end of the spring is fixed to the bottom of the housing 502, and the other end is connected to the bottom end of the sliding rod 503. The elastic force of the spring provides a continuous pressing force to the scraper 504, ensuring that the sticky impurities are effectively scraped off.

[0029] Specifically, such as Figure 2 , Figure 3 As shown, the filtration assembly includes a partition plate 201, a solenoid valve 202, and a filter screen 203. Multiple partition plates 201 are fixedly connected at equal intervals inside the treatment box 101. The solenoid valve 202 is installed on the partition plate 201 and is used to control the discharge of sewage through the partition plate 201. The filter screen 203 is installed between two adjacent partition plates 201, and the filter holes on the filter screen 203 gradually decrease in size from top to bottom.

[0030] A connecting pipe 204 is installed on the outlet of the solenoid valve 202 located on the bottom partition plate 201, and the liquid outlet end of the connecting pipe 204 is located on the sorting plate 401.

[0031] Multiple sets of piston cylinders 601 are fixedly connected to the inner wall of the purification box 1. An air outlet pipe 602 is connected to the air outlet end of the piston cylinder 601. Multiple sets of air outlets are connected to the air outlet pipe 602. The air outlets are located between two adjacent sets of partition plates 201.

[0032] Specifically, such as Figure 2 As shown, a pressure sensor 702 and a laser particle sensor 701 are installed in the processing box 101 and the sorting box 102, respectively. An electric control valve is installed in the air outlet. The pressure sensor 702 is used to detect the water pressure in the two adjacent sets of partition plates 201, and the laser particle sensor 701 is used to detect the amount of particles on the conveyor belt 403.

[0033] At this time, the partition plate 201 is fixed in the processing box 101 at equal intervals in multiple layers, dividing the processing box 101 into 3 to 5 independent filter chambers (preferably 4 layers in this embodiment), and each filter chamber corresponds to a set of filter screens 203 and pressure sensors 702.

[0034] The solenoid valve 202 is installed in the middle through hole of each partition plate 201, and is controlled by the control system to realize the step-by-step flow and cut-off of sewage in each filter chamber.

[0035] The filter screen 203 is installed between two adjacent sets of partition plates 201. The filter pore size gradually decreases from top to bottom (the upper filter screen 203 has a filter pore diameter of 8~10mm, which intercepts large particles such as stones and fiber clumps; the middle filter screen 203 has a filter pore diameter of 2~5mm, which intercepts sand, coarse metal particles, etc.; and the lower filter screen 203 has a filter pore diameter of 0.1~1mm, which intercepts fine metal particles, chemical precipitates, etc.), thus achieving "coarse to fine" graded filtration.

[0036] Specifically, piston cylinder 601 is fixed to the inner wall of purification chamber 1, and each set of filter chambers corresponds to one set of piston cylinder 601. One end of the air outlet pipe 602 is connected to the air outlet end of piston cylinder 601, and the other end extends into the filter chamber. Multiple sets of air outlets are evenly distributed on the side of the air outlet pipe 602 facing the filter screen 203. An electric control valve (controlled by the control system) is installed in the air outlet for automatic back cleaning of filter screen 203.

[0037] Multiple sets of collection and discharge pipes 8 are fixedly connected inside the sorting box 102. The collection and discharge pipes 8 are used to collect and discharge the sorted liquid and particles flowing out of the conveyor belt 403 respectively.

[0038] When using this device, please refer to the following usage procedure: Hierarchical filtration process Step 1: The user starts the system through the display panel of the control panel and selects "automatic mode" or "manual mode" (this embodiment takes automatic mode as an example). The control system controls the water inlet valve at the top of the treatment tank 101 to open, and the sewage to be treated (such as electroplating wastewater, sand washing wastewater, etc.) flows into the uppermost filter chamber of the treatment tank 101. Step 2: The control system closes the solenoid valve 202 on the top partition plate 201, and the sewage remains in the top filter chamber for 10-30 seconds, and large particles (such as stones, fiber clumps, and large metal fragments) are intercepted by the upper filter screen 203 (8-10mm filter holes). Step 3: After sufficient time, the control system opens the lower solenoid valve 202, and the filtered sewage flows into the second filter chamber. The second filter screen 203 (filter holes 2~5mm) traps medium-sized impurities such as sand and coarse metal particles, and the above process is repeated. Step 4: Wastewater flows through the third and fourth filter chambers in sequence. It passes through the lower filter screen 203 (0.1~1mm filter holes) to trap fine metal particles, chemical precipitates and other fine particulate impurities. Finally, it flows into the connecting pipe 204 through the solenoid valve 202 on the bottom partition plate 201, and is evenly transported to the feed end of the sorting plate 401 by the connecting pipe 204. Step 5: During the tiered filtration process, the display panel shows the water pressure value of each filter chamber and the on / off status of solenoid valve 202 in real time, making it easy for users to monitor the filtration progress.

[0039] Subsequent automatic cleaning process: Under normal conditions, each filter chamber is not filled with water, which facilitates the filtration of wastewater through the filter screen 203. If the filter screen 203 becomes clogged, it will cause the water pressure in this filter chamber to increase. When the pressure sensor 702 of a certain filter chamber detects that the water pressure exceeds 0.2MPa (the blockage warning threshold for example; under normal conditions, the water pressure is below 0.2MPa), or when the control system opens the solenoid valve 202 of that layer and the water pressure does not drop within 30 seconds (indicating severe blockage of the filter holes and that sewage cannot flow normally), the automatic back-cleaning process is triggered. Cleaning process: The control system immediately closes all solenoid valves 202 above this floor to cut off the sewage inflow, and at the same time closes the solenoid valve 202 on this floor to prevent sewage backflow. The control system opens the piston cylinder 601 corresponding to the filter chamber and the air outlet solenoid valve. The piston cylinder 601 generates airflow, which is sprayed onto the surface of the filter screen 203 through the air outlet of the air outlet pipe 602. This makes the pressure at the bottom of the filter chamber greater than the pressure at the top, thereby impacting the surface of the filter screen 203, causing some impurities to fall off, thus making the filter screen 203 partially unobstructed, allowing the liquid to pass through smoothly and reach the bottom, thereby reducing the pressure and returning to the normal state. After cleaning is complete, close piston cylinder 601 and the electronic control valve, reopen solenoid valve 202 for that layer, and continuously monitor water pressure with pressure sensor 702. If the water pressure returns to 0.05~0.1MPa, the system resumes normal filtration; if the water pressure is still higher than the threshold, repeat the back-cleaning process (up to 3 times). It should be noted that the air outlets on the air outlet pipe 602 are normally open and are equipped with a one-way valve to prevent liquid backflow. When cleaning is required, close the other air outlets and leave only the outlets that need to be used for air discharge.

[0040] This method is only for temporary cleaning. Afterwards, it is still necessary to manually open and clean the filter 203.

[0041] Further classification of residual impurities in wastewater: After filtration, the wastewater flows through connecting pipe 204 to the surface of sorting plate 401. Laser particle sensor 701 detects the particle size and density distribution in the wastewater in real time and transmits the data to the control system. The control system automatically matches sorting parameters based on the detection data. If "viscous impurities > 20% + particle size > 1mm" is detected (e.g., high-viscosity industrial wastewater), the control system controls the telescopic cylinder 303 to adjust the tilt angle of the sorting plate 401 to 0.5°~1°, and at the same time controls the servo motor 402 to drive the conveyor belt 403 to rotate downward (linear speed 0.02~0.03m / s), prioritizing the anti-clogging effect; If the system detects that "the proportion of fine heavy particles is >30% + particle size 0.01~0.1mm" (such as electronic wastewater containing precious metals), the control system adjusts the tilt angle of the sorting plate 401 to 1°~2° and controls the conveyor belt 403 to rotate upward (linear speed 0.03~0.04m / s) to extend the residence time of fine particles and improve the recovery accuracy. The telescopic motor 301 drives the sorting plate 401 to perform an asymmetrical reciprocating motion of "fast forward and slow backward", which gives the particles in the wastewater an inertial force along the length of the sorting plate 401 (heavy particles have a large inertial force, while light impurities have a small inertial force); at the same time, the tilt angle of the sorting plate 401 generates a component of gravity, which guides the particles to flow along the width of the sorting plate 401. The two work together to make particles with different characteristics form differentiated motion trajectories. The dynamic groove formed by the partition bar 404 and the conveyor belt 403 creates a stable laminar flow of wastewater within the groove (the upper layer consists of light impurities and wastewater, while the lower layer consists of settled heavy particles), preventing particle mixing caused by turbulent water flow. Heavy particles (such as metals and sand, with a density ≥2.6g / cm³) settle to the surface of the conveyor belt 403 and accumulate along the length of the sorting plate 401 under inertial force, eventually flowing into the collection and discharge pipe 8 (located on the far left) of the heavy particle recovery zone. Light impurities (such as organic fibers and debris, with a density ≤1.1g / cm³) flow with the water along the width of the sorting plate 401 and flow into the collection and discharge pipe 8 (located on the far right) of the light impurity collection zone. The middle layer contains medium-density impurities, and the sorted wastewater is discharged through the dedicated collection and discharge pipe 8 and enters subsequent treatment units (such as biological treatment tanks and deep filtration equipment for classified recycling). During the sorting process, the laser particle sensor 701 continuously detects the particle distribution. If a decrease in sorting accuracy is detected (such as heavy particles being mixed into the light impurity collection area), the control system automatically fine-tunes the speed of the conveyor belt 403 or the tilt angle of the sorting plate 401 to ensure stable sorting results.

[0042] Cleaning and recycling of viscous impurities During the sorting process, some sticky impurities (such as organic flocs and fat debris) will adhere to the surface of the conveyor belt 403. When the conveyor belt 403 rotates to both ends of the sorting plate 401, the scraper 504 of the cleaning component will continue to adhere to the surface of the conveyor belt 403 under the elastic pressure of the spring, forcibly scraping off the sticky impurities. The scraped-off sticky impurities fall into the collection tank at the bottom of the sorting box 102. Figure 2 The bottommost area is used for temporary sludge collection. Users can periodically remove the sticky impurities in the collection tank by opening the inspection door on the side of the purification box 1 (not shown in the figure).

[0043] Finally, it should be noted that the impurities within the filter assembly also contain recyclable particles that can be processed again later.

[0044] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make some modifications or alterations to the above-described technical content to create equivalent embodiments without departing from the scope of the present invention. Any simple modifications, equivalent changes, and alterations made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the scope of the present invention.

Claims

1. A sewage purification system comprising a purification tank (1) in which a treatment tank (101) and a sorting tank (102) are arranged from top to bottom, characterized in that, Also include: Filtering assembly installed in the processing box (101), the filtering assembly is used for filtering treatment to the sewage into the processing box (101); Sorting assembly is installed in the sorting box (102), the sorting assembly is used for sorting the particles in the sewage after filtering treatment; The sorting assembly includes telescopic motor (301), mounting plate (302), sorting plate (401), the telescopic motor (301) is fixedly connected in the sorting box (102), the mounting plate (302) is fixedly connected on the telescopic end of telescopic motor (301), the sorting plate (401) is installed on the mounting plate (302), the sorting plate (401) is rotatably connected with the conveying belt (403), and the sorting plate (401) is fixedly connected with the partition strip (404), the partition strip (404) is attached to the upper surface of the conveying belt (403); The sorting plate (401) is inclinedly arranged, when the filtered sewage flows onto the sorting plate (401), the sorting plate (401) is made to advance fast and retreat slow asymmetric reciprocating motion due to the telescopic motor (301), the inertia force is generated by the motion, and then the particles in the sewage are sorted; When sorting, some particles with strong viscosity will be left between the partition strips (404), at this time, the conveying belt (403) rotates, can transport the adhered particles, make the relatively clean conveying belt (403) surface contact with the sewage, facilitate sorting.

2. A sewage purification system according to claim 1, characterised in that The mounting plate (302) is rotatably connected with the telescopic cylinder (303), the sorting plate (401) is rotatably connected on the telescopic end of the telescopic cylinder (303), the inclination angle of the sorting plate (401) can be adjusted through the telescopic cylinder (303).

3. A sewage purification system according to claim 2, characterised in that The sorting plate (401) is fixedly connected with the servo motor (402), and the output end of the servo motor (402) is connected with the conveying belt (403), which is used for rotating the conveying belt (403).

4. A sewage purification system according to claim 3, wherein The sorting plate (401) is fixedly connected with the cleaning assembly on both ends of the conveying belt (403).

5. A sewage purification system according to claim 4, characterised in that The cleaning assembly includes a bottom plate (501), a housing (502), a sliding rod (503), a scraping strip (504), the bottom plate (501) is detachably installed on the sorting plate (401), a plurality of housings (502) are fixedly connected on the bottom plate (501) at equal intervals, the sliding rod (503) is slidably connected in the housing (502), the scraping strip (504) is fixedly connected on the sliding rod (503), the scraping strip (504) is abutted with the conveying belt (403), the housing (502) is provided with a spring member, and the other end of the sliding rod (503) is connected with the spring member.

6. A sewage purification system according to claim 4, wherein The filter assembly comprises a partition plate (201), a solenoid valve (202) and a filter screen (203), a plurality of the partition plates (201) are fixedly connected in the treatment box (101) at equal intervals, the solenoid valve (202) is installed on the partition plate (201), the solenoid valve (202) is used for controlling sewage to be discharged through the partition plate (201), the filter screen (203) is installed between two adjacent partition plates (201), and filter holes on the filter screen (203) are gradually reduced from top to bottom.

7. A sewage purification system according to claim 6, characterised in that A connecting pipe (204) is installed on the outlet of the solenoid valve (202) on the lowermost partition plate (201), and a liquid outlet end of the connecting pipe (204) is located on the sorting plate (401).

8. A sewage purification system according to claim 7, characterised in that A plurality of piston cylinders (601) are fixedly connected to the inner wall of the purification box (1), a gas outlet pipe (602) is connected to the gas outlet end of the piston cylinder (601), a plurality of gas outlets are connected to the gas outlet pipe (602), and the gas outlets are located between two adjacent partition plates (201).

9. A sewage purification system according to claim 8, characterised in that A pressure sensor (702) and a laser particle sensor (701) are respectively installed in the treatment box (101) and the sorting box (102), an electric control valve is installed in the gas outlet, the pressure sensor (702) is used for detecting the water pressure in two adjacent partition plates (201), and the laser particle sensor (701) is used for detecting the particle amount on the conveying belt (403).

10. The system for purifying wastewater of claim 1, wherein, A plurality of collection and discharge pipes (8) are fixedly connected in the sorting box (102), and the collection and discharge pipes (8) are used for respectively collecting and discharging the sorted liquid and particles flowing out of the conveying belt (403).

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