Phosphorus removal method for wastewater from regeneration of waste lithium battery

Abstract

The application discloses a kind of phosphorus removal methods for waste water of waste lithium battery regeneration, belong to wastewater phosphorus removal technical field.A kind of phosphorus removal methods for waste water of waste lithium battery regeneration, comprising the following steps:S1: wastewater is passed into box body inside, processing liquid is added to box body inside, then start push rod motor and drive motor, drive motor drives connecting shaft to rotate, connecting shaft drives stirring plate to rotate, while push rod motor is pushed to guide plate.The application can be stirred and mixed to treat waste gas, harmful substances in wastewater are generated to form a precipitate, the precipitate in wastewater is separated, the precipitate is collected separately, and the treated wastewater is transported to the next process for treatment, improving practicality.

Description

Technical Field

[0001] This invention belongs to the field of wastewater phosphorus removal technology, specifically relating to a method for phosphorus removal from waste lithium battery regeneration wastewater. Background Technology

[0002] CN115448501 discloses a method for removing phosphorus from wastewater from the recycling of waste lithium iron phosphate batteries. The method includes the following steps: taking the wastewater from the recycling of waste lithium iron phosphate batteries, adjusting the pH to 2-3, adding an appropriate amount of hypochlorite solution, reacting for a certain time to oxidize phosphorus in different valence states in the wastewater into phosphate ions; adding an appropriate amount of calcium chloride, then adding an appropriate amount of sodium hydroxide solution to adjust the pH to 11; adding an appropriate amount of polyacrylamide; filtering the treated wastewater from the recycling of waste lithium iron phosphate batteries, adjusting the pH of the filtrate to 7-8, detecting the total phosphorus concentration in the filtrate, and discharging after meeting the discharge standards. This invention provides a method for phosphorus removal from wastewater from the recycling of waste lithium iron phosphate batteries. This method produces less slag and enhances the precipitation effect by adding polyacrylamide, further reducing the total phosphorus concentration to meet emission standards. While this method can remove harmful substances from wastewater through precipitation, the precipitate needs to be collected separately after precipitation. It is not possible to automatically collect the generated precipitate separately during transportation, which reduces the level of automation. Therefore, we propose a method for phosphorus removal from waste lithium battery recycling wastewater. Summary of the Invention

[0003] The purpose of this invention is to provide a method for removing phosphorus from wastewater from the recycling of waste lithium batteries, so as to solve the problems mentioned in the background art.

[0004] To achieve the above objectives, the present invention provides the following technical solution:

[0005] A method for removing phosphorus from waste lithium battery regeneration wastewater includes a phosphorus removal device. The phosphorus removal device comprises a base, support, housing, filter table, filter channel, filter screen, driven shaft, connecting seat one, connecting seat two, connecting seat three, guide plate, push rod motor, drive motor, connecting shaft, stirring plate, fixed seat, fixed shaft, bevel gear one, bevel gear two, adjusting gear, adjusting plate, adjusting rack, connecting groove, connecting plate, connecting block, sliding plate, collection box one, collection box two, fixed gear, and fixed rack. The method includes the following steps:

[0006] S1: The wastewater is introduced into the tank, the treatment liquid is added into the tank, and then the push rod motor and the drive motor are started. The drive motor drives the connecting shaft to rotate, the connecting shaft drives the stirring plate to rotate, and at the same time the push rod motor pushes the guide plate, the guide plate drives the stirring plate to move, so that the stirring plate enters the tank and mixes and settles the wastewater and treatment liquid inside the tank.

[0007] S2: After processing, the push rod motor drives the stirring plate to move out of the box, and then the valve is opened to allow the treated wastewater and sediment to enter the filtration channel. After being filtered by the filter screen, the filtered wastewater falls into the collection tank. By opening the control valve, the wastewater in the collection tank is transported to the next processing point through the conveying pipe.

[0008] S3: After wastewater filtration is completed, solid impurities are still on the surface of the filter screen. Then, the connecting plate is moved, which drives the connecting block to move, allowing the connecting block to enter the connecting groove. Then, the push rod motor drives the guide plate to move downward and then upward. During the downward movement of the guide plate, the guide plate drives the connecting plate to move, which in turn drives the adjusting plate to move downward. The adjusting plate drives the adjusting rack to move, which in turn meshes with the adjusting gear, causing the driven shaft to rotate. The driven shaft causes the filter screen to flip over. At the same time, the driven shaft drives the second bevel gear to rotate, which meshes with the first bevel gear, causing the fixed shaft to rotate. The fixed shaft drives the fixed gear to rotate, which in turn meshes with the fixed rack, causing the sliding plate to move. This causes the sliding plate to move the collection box directly below the filter screen, allowing the solid impurities on the filter screen surface to fall into the second collection box for separate collection.

[0009] S4: After collection is completed, the guide plate moves upward, and through the above transmission principle, the filter screen flips to the initial state. The slide moves the collection box to be located directly below the filter screen. Then the connecting plate is removed, and the connecting plate moves the connecting block out of the connecting groove.

[0010] It should be noted in the solution that the phosphorus removal equipment includes a base, with symmetrically distributed support seats fixed at both ends of the base. A box is fixed at the top of the support seats, and a filter table is arranged below the box. The two ends of the filter table are fixed to the side walls of the support seats. A filter channel is opened vertically on the upper surface of the filter table. A filter screen is rotatably connected to the inner wall of the filter channel. A sliding plate is slidably connected to the upper surface of the base. A collection box one and a collection box two are placed at the top of the sliding plate. The collection box one is located directly below the filter screen. A conveying pipe is connected to the outer wall of the collection box one, and a control valve is connected to the conveying pipe.

[0011] It is worth noting that a connecting seat 1 is fixed to the outer wall of the box, and a connecting seat 2 is fixed to the other end of the connecting seat 1. The connecting seat 1 and the connecting seat 2 are arranged perpendicularly to each other, and a connecting seat 3 is fixed to the top of the connecting seat 2.

[0012] Furthermore, it should be noted that a push rod motor is fixed to the top of the connecting seat three, a guide plate is slidably connected to one side wall of the connecting seat two, a drive motor is fixed to the top side wall of the guide plate, the output shaft of the drive motor is fixed to a connecting shaft through a coupling, and symmetrically distributed stirring plates are fixed to the outer wall of the connecting shaft, with the stirring plates located directly above the box body, and the connecting shaft and the stirring plates are vertically arranged.

[0013] Preferably, the output shaft of the push rod motor passes through the connecting seat three and is fixed to the upper surface of the guide plate. A driven shaft is fixed to one side wall of the filter screen, and an adjusting gear is fixed to the other end of the driven shaft outside the filter table.

[0014] Preferably, the outer wall of the filter table is damped and slidably connected to an adjusting plate, and an adjusting rack is provided on the side wall of the adjusting plate near the driven shaft along its length direction, and the adjusting gear and the adjusting rack are meshed and connected for transmission.

[0015] Preferably, the top sidewall of the adjusting plate and the bottom sidewall of the guide plate are provided with connecting grooves, a connecting plate is provided above the adjusting plate, and connecting blocks are fixed at both ends of the connecting plate, and the connecting blocks are engaged with the connecting grooves.

[0016] Preferably, the outer wall of the filter table is fixed with a fixed seat, the upper surface of the fixed seat is provided with a fixed channel in the vertical direction, the inner wall of the fixed channel is rotatably connected with a fixed shaft, the top end of the fixed shaft is fixed with a bevel gear one, the outer wall of the driven shaft is fixed with a bevel gear two, and the bevel gear one and bevel gear two are meshed and connected for transmission.

[0017] Preferably, a fixed gear is fixed to the bottom end of the fixed shaft, and a fixed rack is provided on the side wall of the slide plate near the fixed shaft. The fixed gear and the fixed rack mesh and drive each other, which can automatically drive the collection box two to switch positions during the flipping of the filter screen, and collect and process the solid matter on the surface of the filter screen separately. A discharge pipe is fixed to the bottom side wall of the box body, and a valve is connected to the discharge pipe. The discharge pipe is located directly above the filter screen.

[0018] Compared with the prior art, the phosphorus removal method for waste lithium battery regeneration wastewater provided by the present invention has at least the following beneficial effects:

[0019] (1) The present invention, through the combination of the set box, stirring plate, drive motor, filter table, filter screen and collection box one and collection box two, can stir and mix the waste gas, generate precipitates of harmful substances in the wastewater, separate the precipitates in the wastewater, collect the precipitates separately, and transport the treated wastewater to the next process for further treatment, thereby improving its practicality.

[0020] (2) The present invention, through the combination of driven shaft, adjusting plate, connecting plate, connecting block, connecting groove, sliding plate and other structures, can quickly flip the filter screen, so that the sediment on the surface of the filter screen is automatically collected without manual collection. After the sediment is collected, the collection box can be automatically switched, which has a high degree of automation and strong flexibility. Attached Figure Description

[0021] Figure 1 This is a front view of the structure of the present invention;

[0022] Figure 2 This is a side view of the structure of the present invention;

[0023] Figure 3 This is a rear view of the structure of the present invention.

[0024] In the picture:

[0025] 1. Base; 2. Support seat; 3. Box body; 4. Filter table; 5. Filter channel; 6. Filter screen; 7. Driven shaft; 8. Connecting seat one; 9. Connecting seat two; 10. Connecting seat three; 11. Guide plate; 12. Push rod motor; 13. Drive motor; 14. Connecting shaft; 15. Stirring plate; 16. Fixed seat; 17. Fixed shaft; 18. Bevel gear one; 19. Bevel gear two; 20. Adjusting gear; 21. Adjusting plate; 22. Adjusting rack; 23. Connecting groove; 24. Connecting plate; 25. Connecting block; 26. Slide plate; 27. Collection box one; 28. Collection box two; 29. ​​Fixed gear; 30. Fixed rack. Detailed Implementation

[0026] The present invention will be further described below with reference to embodiments.

[0027] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, 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 some embodiments of the present invention, but not all embodiments. Based on the described 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.

[0028] The following embodiments are used to illustrate the present invention, but should not be used to limit the scope of protection of the present invention. The conditions in the embodiments can be further adjusted according to specific conditions, and simple improvements to the method of the present invention under the premise of the concept of the present invention are all within the scope of protection claimed by the present invention.

[0029] Please see Figure 1-3This invention provides a method for removing phosphorus from waste lithium battery regeneration wastewater, including a phosphorus removal device. The phosphorus removal device includes a base 1, a support 2, a housing 3, a filter table 4, a filter channel 5, a filter screen 6, a driven shaft 7, a first connecting seat 8, a second connecting seat 9, a third connecting seat 10, a guide plate 11, a push rod motor 12, a drive motor 13, a connecting shaft 14, a stirring plate 15, a fixed seat 16, a fixed shaft 17, a first bevel gear 18, a second bevel gear 19, an adjusting gear 20, an adjusting plate 21, an adjusting rack 22, a connecting groove 23, a connecting plate 24, a connecting block 25, a sliding plate 26, a first collection box 27, a second collection box 28, a fixed gear 29, and a fixed rack 30. The method is characterized by the following steps:

[0030] S1: Wastewater is introduced into the tank 3, treatment liquid is added into the tank 3, and then push rod motor 12 and drive motor 13 are started. Drive motor 13 drives connecting shaft 14 to rotate, connecting shaft 14 drives stirring plate 15 to rotate, and push rod motor 12 pushes guide plate 11. Guide plate 11 drives stirring plate 15 to move, so that stirring plate 15 enters the tank 3 to mix and settle the wastewater and treatment liquid inside the tank 3.

[0031] S2: After processing, the push rod motor 12 drives the stirring plate 15 to move out of the box 3, and then the valve is opened so that the treated wastewater and sediment enter the filter channel 5 and are filtered through the filter screen 6. The filtered wastewater falls into the collection box 27. By opening the control valve, the wastewater in the collection box 27 is transported to the next processing point through the conveying pipe.

[0032] S3: After wastewater filtration is complete, solid impurities remain on the surface of filter screen 6. Then, the connecting plate 24 is moved, causing the connecting block 25 to move and enter the connecting groove 23. Then, the push rod motor 12 drives the guide plate 11 to move downwards and then upwards. During the downward movement of the guide plate 11, the guide plate 11 drives the connecting plate 24 to move, causing the connecting plate 24 to drive the adjusting plate 21 to move downwards. The adjusting plate 21 drives the adjusting rack 22 to move, so that the adjusting rack 22 and the adjusting gear 20... The intermeshing transmission drives the driven shaft 7 to rotate, which in turn drives the filter screen 6 to flip. At the same time, the driven shaft 7 drives the second bevel gear 19 to rotate. The meshing transmission between the second bevel gear 19 and the first bevel gear 18 drives the fixed shaft 17 to rotate. The fixed shaft 17 drives the fixed gear 29 to rotate. The meshing transmission between the fixed gear 29 and the fixed rack 30 drives the slide plate 26 to move. This causes the slide plate 26 to move the collection box directly below the filter screen 6, so that solid impurities on the surface of the filter screen 6 fall into the second collection box 28 for separate collection.

[0033] S4: After collection is completed, the guide plate 11 moves upward, and through the above transmission principle, the filter screen 6 flips to the initial state. The slide plate 26 drives the collection box 27 to be located directly below the filter screen 6. Then the connecting plate 24 is removed, and the connecting plate 24 drives the connecting block 25 to move out of the connecting groove 23.

[0034] The phosphorus removal equipment includes a base 1, with symmetrically distributed support seats 2 fixed at both ends of the base 1. A box body 3 is fixed at the top of the support seats 2. A filter table 4 is arranged below the box body 3. The two ends of the filter table 4 are fixed to the side walls of the support seats 2. A filter channel 5 is opened vertically on the upper surface of the filter table 4. A filter screen 6 is rotatably connected to the inner wall of the filter channel 5. A sliding plate 26 is slidably connected to the upper surface of the base 1. A collection box 1 27 and a collection box 28 are placed at the top of the sliding plate 26. The collection box 1 27 is located directly below the filter screen 6. A conveying pipe is connected to the outer wall of the collection box 1 27. A control valve is connected to the conveying pipe. A connecting seat 1 8 is fixed to the outer wall of the box body 3. A connecting seat 2 9 is fixed to the other end of the connecting seat 1 8. The connecting seat 1 8 and the connecting seat 2 9 are arranged vertically. A connecting seat 3 10 is fixed to the top of the connecting seat 2 9.

[0035] A push rod motor 12 is fixed to the top of the connecting seat 3 10. A guide plate 11 is slidably connected to one side wall of the connecting seat 2 9. A drive motor 13 is fixed to the top side wall of the guide plate 11. The output shaft of the drive motor 13 is fixed to the connecting shaft 14 through a coupling. Symmetrically distributed stirring plates 15 are fixed to the outer wall of the connecting shaft 14, and the stirring plates 15 are located directly above the box 3. The connecting shaft 14 and the stirring plates 15 are vertically arranged. The output shaft of the push rod motor 12 passes through the connecting seat 3 10 and is fixed to the upper surface of the guide plate 11.

[0036] A driven shaft 7 is fixed to one side wall of the filter screen 6. An adjusting gear 20 is fixed to the other end of the driven shaft 7 outside the filter table 4. An adjusting plate 21 is slidably connected to the outer wall of the filter table 4. An adjusting rack 22 is provided along the length of the side wall of the adjusting plate 21 near the driven shaft 7. The adjusting gear 20 and the adjusting rack 22 are meshed and connected. A connecting groove 23 is provided on the top side wall of the adjusting plate 21 and the bottom side wall of the guide plate 11. A connecting plate 24 is provided above the adjusting plate 21. Both ends of the connecting plate 24 are fixed. A connecting block 25 is fixed, which engages with the connecting groove 23. When the connecting plate 24 drives the connecting block 25 into the connecting groove 23, the connecting plate 24 connects with the adjusting plate 21 and the guide plate 11 in the vertical direction. When the guide plate 11 moves, it will drive the connecting plate 24 to move. The connecting plate 24 drives the adjusting plate 21 to move, so that the adjusting plate 21 drives the adjusting rack 22 to mesh with the adjusting gear 20, which drives the driven shaft 7 to rotate. This causes the driven shaft 7 to rotate the filter screen 6.

[0037] A fixed base 16 is fixed to the outer wall of the filter table 4. A fixed channel is opened on the upper surface of the fixed base 16 in the vertical direction. A fixed shaft 17 is rotatably connected to the inner wall of the fixed channel. A bevel gear 18 is fixed to the top of the fixed shaft 17. A bevel gear 19 is fixed to the outer wall of the driven shaft 7. The bevel gear 18 and the bevel gear 19 are meshed and connected. A fixed gear 29 is fixed to the bottom of the fixed shaft 17. A fixed rack 30 is opened on the side wall of the slide plate 26 near the fixed shaft 17. The fixed gear 29 and the fixed rack 30 are meshed and connected. During the flipping of the filter screen 6, the collection box 28 can be automatically driven to switch positions to collect and process the solid matter on the surface of the filter screen 6 separately. A discharge pipe is fixed to the bottom side wall of the box body 3. A valve is connected to the discharge pipe. The discharge pipe is located directly above the filter screen 6.

[0038] Unless otherwise defined, the technical or scientific terms used in this invention shall have the ordinary meaning understood by one of ordinary skill in the art to which this invention pertains. The words “comprising” or “including” and similar terms used in this invention mean that the element or object preceding the word covers the element or object listed after the word and its equivalents, without excluding other elements or objects. The words “connected” or “linked” and similar terms are not limited to physical or mechanical connections, but may also include electrical connections, whether direct or indirect. “Up,” “down,” “left,” “right,” etc., are used only to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0039] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A method for removing phosphorus from waste lithium battery regeneration wastewater, comprising a phosphorus removal device, wherein the phosphorus removal device comprises a base (1), a support seat (2), a housing (3), a filter table (4), a filter channel (5), a filter screen (6), a driven shaft (7), a connecting seat one (8), a connecting seat two (9), a connecting seat three (10), a guide plate (11), a push rod motor (12), a drive motor (13), a connecting shaft (14), a stirring plate (15), a fixed seat (16), a fixed shaft (17), a bevel gear one (18), a bevel gear two (19), an adjusting gear (20), an adjusting plate (21), an adjusting rack (22), a connecting groove (23), a connecting plate (24), a connecting block (25), a sliding plate (26), a collection box one (27), a collection box two (28), a fixed gear (29), and a fixed rack (30), characterized in that, Includes the following steps: S1: Pass wastewater into the tank (3), add treatment liquid into the tank (3), and then start the push rod motor (12) and drive motor (13). The drive motor (13) drives the connecting shaft (14) to rotate, and the connecting shaft (14) drives the stirring plate (15) to rotate. At the same time, the push rod motor (12) pushes the guide plate (11), and the guide plate (11) drives the stirring plate (15) to move, so that the stirring plate (15) enters the tank (3) and mixes and settles the wastewater and treatment liquid inside the tank (3). S2: After the processing is completed, the push rod motor (12) drives the stirring plate (15) to move out of the box (3), and then the valve is opened so that the treated wastewater and sediment enter the filter channel (5), and are filtered through the filter screen (6). The filtered wastewater falls into the collection box (27). By opening the control valve, the wastewater in the collection box (27) is transported to the next processing point through the conveying pipe. S3: After the wastewater filtration is completed, solid impurities are still on the surface of the filter screen (6). Then, the connecting plate (24) is moved, and the connecting plate (24) drives the connecting block (25) to move, so that the connecting block (25) enters the connecting groove (23). Then, the push rod motor (12) drives the guide plate (11) to move downward and then upward. During the downward movement of the guide plate (11), the guide plate (11) drives the connecting plate (24) to move, so that the connecting plate (24) drives the adjusting plate (21) to move downward. The adjusting plate (21) drives the adjusting rack (22) to move, so that the adjusting rack (22) and the adjusting gear (20) are aligned. The intermeshing transmission drives the driven shaft (7) to rotate, which in turn drives the filter screen (6) to flip. At the same time, the driven shaft (7) drives the second bevel gear (19) to rotate. The meshing transmission between the second bevel gear (19) and the first bevel gear (18) drives the fixed shaft (17) to rotate. The fixed shaft (17) drives the fixed gear (29) to rotate. The meshing transmission between the fixed gear (29) and the fixed rack (30) drives the slide plate (26) to move. This causes the slide plate (26) to move the collection box directly below the filter screen (6), so that solid impurities on the surface of the filter screen (6) fall into the second collection box (28) for separate collection. S4: After collection is completed, the guide plate (11) moves upward. Through the above transmission principle, the filter screen (6) is flipped to the initial state. The slide plate (26) drives the collection box (27) to be located directly below the filter screen (6). Then the connecting plate (24) is removed, and the connecting plate (24) drives the connecting block (25) to move out of the connecting groove (23).

2. The method for phosphorus removal from waste lithium battery regeneration wastewater according to claim 1, characterized in that: The phosphorus removal equipment includes a base (1), with symmetrically distributed support seats (2) fixed at both ends of the base (1). A box body (3) is fixed at the top of the support seats (2). A filter table (4) is provided below the box body (3). The two ends of the filter table (4) are fixed to the side walls of the support seats (2). A filter channel (5) is opened vertically on the upper surface of the filter table (4). A filter screen (6) is connected to the inner wall of the filter channel (5) with damping rotation. A sliding plate (26) is slidably connected to the upper surface of the base (1). A collection box one (27) and a collection box two (28) are placed at the top of the sliding plate (26). The collection box one (27) is located directly below the filter screen (6). A conveying pipe is connected to the outer wall of the collection box one (27), and a control valve is connected to the conveying pipe.

3. The method for phosphorus removal from waste lithium battery regeneration wastewater according to claim 2, characterized in that: The outer wall of the box (3) is fixed with a connecting seat one (8), and the other end of the connecting seat one (8) is fixed with a connecting seat two (9). The connecting seat one (8) and the connecting seat two (9) are arranged vertically between each other, and the top of the connecting seat two (9) is fixed with a connecting seat three (10).

4. The method for phosphorus removal from waste lithium battery regeneration wastewater according to claim 3, characterized in that: A push rod motor (12) is fixed at the top of the third connecting seat (10). A guide plate (11) is slidably connected to one side wall of the second connecting seat (9). A drive motor (13) is fixed at the top side wall of the guide plate (11). The output shaft of the drive motor (13) is fixed to a connecting shaft (14) through a coupling. Symmetrically distributed stirring plates (15) are fixed on the outer wall of the connecting shaft (14). The stirring plates (15) are located directly above the box body (3). The connecting shaft (14) and the stirring plates (15) are vertically arranged.

5. The method for phosphorus removal from waste lithium battery regeneration wastewater according to claim 4, characterized in that: The output shaft of the push rod motor (12) passes through the connecting seat three (10) and is fixed to the upper surface of the guide plate (11). A driven shaft (7) is fixed to one side wall of the filter screen (6), and an adjusting gear (20) is fixed to the other end of the driven shaft (7) outside the filter table (4).

6. The method for phosphorus removal from waste lithium battery regeneration wastewater according to claim 5, characterized in that: The outer wall of the filter table (4) is damped and slidably connected to an adjustment plate (21). An adjustment rack (22) is provided on the side wall of the adjustment plate (21) near the driven shaft (7) along its length direction. The adjustment gear (20) and the adjustment rack (22) are meshed and connected for transmission.

7. The method for phosphorus removal from waste lithium battery regeneration wastewater according to claim 6, characterized in that: The top sidewall of the adjusting plate (21) and the bottom sidewall of the guide plate (11) are both provided with connecting grooves (23). A connecting plate (24) is provided above the adjusting plate (21). Connecting blocks (25) are fixed at both ends of the connecting plate (24). The connecting blocks (25) are engaged with the connecting grooves (23).

8. The method for phosphorus removal from waste lithium battery regeneration wastewater according to claim 7, characterized in that: The filter table (4) has a fixed base (16) fixed on its outer wall. The upper surface of the fixed base (16) has a fixed channel in the vertical direction. The inner wall of the fixed channel is rotatably connected to a fixed shaft (17). The top end of the fixed shaft (17) is fixed with a bevel gear one (18). The outer wall of the driven shaft (7) is fixed with a bevel gear two (19). The bevel gear one (18) and the bevel gear two (19) are meshed and connected for transmission.

9. A method for removing phosphorus from waste lithium battery regeneration wastewater according to claim 8, characterized in that: A fixed gear (29) is fixed at the bottom end of the fixed shaft (17). A fixed rack (30) is provided on the side wall of the slide plate (26) near the fixed shaft (17). The fixed gear (29) and the fixed rack (30) mesh and drive each other, which can automatically drive the collection box (28) to switch positions during the flipping of the filter screen (6) to collect solid substances on the surface of the filter screen (6) separately. A discharge pipe is fixed on the bottom side wall of the box body (3). A valve is connected to the discharge pipe. The discharge pipe is located directly above the filter screen (6).

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