Filtering device for water pollution prevention and control

Abstract

The utility model discloses a filtering device for water pollution prevention and control, and belongs to the technical field of water pollution prevention and control. The filtering device for water pollution prevention and control comprises a connecting piece, a liquid inlet assembly and a filtering assembly, the filtering assembly is arranged outside the connecting piece, the liquid inlet assembly is arranged above the filtering assembly, the liquid inlet assembly comprises a pair of circular plates, the top ends of the pair of circular plates are communicated with liquid inlet pipes, and a communicating pipe is communicated between the ends, away from the circular plates, of the two liquid inlet pipes; solenoid valves are installed at the ends, away from the communicating pipe, of the two liquid inlet pipes, hollow bases are arranged at the bottom ends of the pair of circular plates, connecting rings are arranged at the bottom ends of the two hollow bases, the ends, away from the liquid inlet pipes, of the two solenoid valves communicate with pipelines, and the ends, away from the solenoid valves, of the two pipelines penetrate through the circular plates and the hollow bases and extend into the hollow bases. The filter assembly comprises a pair of filter cartridges, and the filter cartridges are installed on the two sides of the outer portion of the connecting piece respectively.

Description

A filtration device for water pollution control Technical Field

[0001] This utility model relates to the field of water pollution control technology, specifically a filtration device for water pollution control. Background Technology

[0002] Water pollution prevention and control refers to the prevention and treatment of water pollution caused by the introduction of certain substances, which alters the chemical, physical, biological, or radioactive properties of water bodies, thereby affecting the effective use of water, endangering human health, or damaging the ecological environment, and causing water quality deterioration. In the process of water pollution prevention and control, filtration devices are needed to filter wastewater to obtain pure water that can be reused.

[0003] Based on the above, the inventors have discovered the following problem: In the current filtration device, the filter plate becomes clogged during wastewater filtration, affecting the filtration speed. At this time, the filter plate needs to be disassembled for maintenance. During the cleaning or replacement maintenance process, the machine needs to be stopped, thereby reducing the efficiency of wastewater filtration.

[0004] Therefore, in view of this, we will study and improve the existing structure and its shortcomings to provide a filtration device for water pollution prevention and control, in order to achieve a more practical value. Summary of the Invention

[0005] The purpose of this invention is to provide a filtration device for water pollution prevention and control, so as to solve the problems mentioned in the background art.

[0006] In view of the above problems, the technical solution proposed by this utility model is as follows:

[0007] A filtration device for water pollution control includes a connector, an inlet assembly, and a filter assembly. The filter assembly is disposed outside the connector, and the inlet assembly is disposed above the filter assembly. The inlet assembly allows wastewater to enter the filter assembly, and the filter assembly filters the wastewater. The inlet assembly includes a pair of circular plates, each with an inlet pipe connected to its top. A connecting pipe connects the two inlet pipes at their ends away from the circular plates. A solenoid valve is installed at the end of each inlet pipe away from the connecting pipe. A hollow seat is provided at the bottom of each pair of circular plates, and a connecting ring is provided at the bottom of each hollow seat. A pipe connects the two solenoid valves at their ends away from the inlet pipes. The pipes extend through the circular plates and hollow seats to the interior of the hollow seats at their ends away from the solenoid valves. The filter assembly includes a pair of filter cylinders, which are respectively installed on both sides of the connector, and the top surfaces of the filter cylinders are fixedly connected to the bottom surfaces of the connecting rings.

[0008] Furthermore, a long opening is provided on one side of the bottom end of the hollow seat. The top and bottom surfaces of the hollow seat are connected to the bottom surface of the circular plate and the top surface of the connecting ring respectively through bearings. A toothed ring is fitted on the outside of the hollow seat. A rotating shaft is rotatably connected between the opposite sides of the circular plate and the connecting ring. A gear is fitted on the outside of the rotating shaft. The gear meshes with the toothed ring. A servo motor is installed on one side of the top surface of the circular plate. The output end of the servo motor is fixedly connected to the rotating shaft.

[0009] The beneficial effect of adopting the above-mentioned further solution is that, through the combined use of the hollow seat, gear ring, gear and servo motor, since a long opening is opened on one side of the bottom of the hollow seat, the length of the long opening is consistent with the radius of the hollow seat. When the servo motor works, it drives the rotating shaft and gear to rotate. The gear meshes with the gear ring, thereby driving the hollow seat to rotate. When sewage enters the filter cartridge through the inlet pipe and the hollow seat, the sewage can be more evenly distributed in the filter cartridge, avoiding excessive local filtration pressure and improving filtration efficiency and effect.

[0010] Furthermore, the inner walls of the through holes of the two hollow seats are connected with sealing rings, and the outer walls of the two liquid inlet pipes are respectively fitted with the inner walls of the two sealing rings with clearance.

[0011] The beneficial effect of adopting the above-mentioned further solution is that by setting a sealing ring, the inner wall of the sealing ring is fitted with the outer wall of the inlet pipe with a clearance, which prevents sewage from leaking from the connection between the inlet pipe and the hollow seat without affecting the rotation of the hollow seat, thus ensuring the sealing performance and normal operation of the device.

[0012] Furthermore, each of the pair of filter cartridges has a hollow ring connected to its bottom end, and a hollow cylinder is provided at the top end of the hollow ring. Sliding grooves are provided on both sides of the inner wall of the hollow cylinder. Sliding strips are provided inside each pair of sliding grooves. Three mounting rings are slidably arranged between the pair of sliding strips. The three mounting rings are arranged sequentially from top to bottom, and a coarse filter screen, a fine filter screen, and an ultrafiltration membrane are respectively connected inside the three mounting rings.

[0013] The beneficial effect of adopting the above-mentioned further solution is that by using coarse filter screen, fine filter screen and ultrafiltration membrane in combination, wastewater is filtered in multiple stages, gradually removing impurities and pollutants of different sizes from the wastewater, thereby improving the accuracy and quality of filtration. By using sliding strips and sliding grooves in combination, when it is necessary to disassemble and clean the coarse filter screen, fine filter screen and ultrafiltration membrane, the two sliding strips are separated from the two sliding grooves by pulling the sliding strips upward, and the coarse filter screen, fine filter screen and ultrafiltration membrane are taken out as a whole from the inside of the hollow cylinder.

[0014] Furthermore, the outer wall of the slide bar slides in slidable engagement with the inner wall of the slide groove. Notches are provided on both outer sides of the mounting plate, and the inner walls of the notches slide in slidable engagement with the outer wall of the slide bar. Connecting plates are connected to the bottom of the mounting plate on both sides of the notches. A first square hole is provided inside each pair of connecting plates. A second square hole is provided inside the slide bar at the location of the first square hole. A square rod is provided between the second square hole and the pair of first square holes. The outer wall of the square rod slides in slidable engagement with the inner walls of the first and second square holes.

[0015] The beneficial effect of adopting the above-mentioned further solution is that, through the coordinated use of the first square hole, the second square hole, and the square rod, when it is necessary to replace or clean the coarse filter screen, the fine filter screen, and the ultrafiltration membrane, the slide bar is pulled upward to separate the two slide bars from the two slide grooves, and the coarse filter screen, the fine filter screen, and the ultrafiltration membrane are taken out of the hollow cylinder as a whole. Then, by pulling the square rod outward, the square rod is separated from the first square hole and the second square hole, and the mounting ring is removed from the slide bar under the action of the notch and the slide bar, and the coarse filter screen, the fine filter screen, and the ultrafiltration membrane set on the three mounting rings are cleaned.

[0016] Furthermore, each of the pair of filter cartridges has a locking inlet on the side away from the connecting strip. The locking inlet has a locking plate inside, and the outer wall of the locking plate is in clearance fit with the inner wall of the locking inlet. One side of the locking plate is fixedly connected to the outer wall of the hollow cartridge, and a pair of handles are connected to the locking plate on the side away from the hollow cartridge.

[0017] The beneficial effect of adopting the above-mentioned further solution is that, by using the combination of the insert plate and the insert inlet, the insert plate can be removed from the insert inlet by the handle, thereby removing the hollow cylinder and its internal mounting ring, coarse filter screen, fine filter screen and ultrafiltration membrane as a whole.

[0018] Furthermore, each of the two filter cylinders has a drain pipe connected to its bottom end, and a valve is connected to the end of the drain pipe away from the filter cylinder. Support legs are connected to both sides of the outer side of each of the two filter cylinders.

[0019] The beneficial effect of adopting the above-mentioned further solution is that, through the coordinated use of the drain pipe and the valve, the opening and closing of the valve can realize the opening and closing of the drain pipe, and by setting up the support legs, the stability of the filtration device is improved.

[0020] Compared with the prior art, the beneficial effects of this utility model are as follows: This filtration device for water pollution prevention opens the solenoid valve at the left inlet pipe and closes the solenoid valve at the right inlet pipe. Wastewater enters the interior of the left filter cylinder through the connecting pipe, the left inlet pipe, and the left hollow seat. Through the combined use of coarse filter, fine filter, and ultrafiltration membrane, the wastewater undergoes multi-stage filtration, gradually removing impurities and pollutants of different sizes from the wastewater, thereby improving the accuracy and quality of filtration. When a large amount of impurities accumulate on the surface of the coarse and fine filter screens inside the left filter cylinder, the solenoid valve at the left inlet pipe is closed, and the solenoid valve at the right inlet pipe is opened. This changes the wastewater flow path, allowing the wastewater to enter the interior of the right filter cylinder through the connecting pipe, the right inlet pipe, and the right hollow seat. At the same time, the left retaining plate is removed from the retaining port by the handle, thereby removing the hollow cylinder and its internal mounting ring, coarse filter, fine filter, and ultrafiltration membrane from the left filter cylinder as a whole, thus avoiding downtime and improving filtration efficiency. Attached Figure Description

[0021] Figure 1 is a three-dimensional structural schematic diagram of a filtration device for water pollution prevention and control provided by this utility model;

[0022] Figure 2 is a bottom-view three-dimensional structural diagram of a filtration device for water pollution prevention provided by this utility model;

[0023] Figure 3 is an exploded three-dimensional structural diagram of the liquid inlet component of a filtration device for water pollution prevention provided by this utility model;

[0024] Figure 4 is an exploded three-dimensional structural diagram of the filter component of a water pollution prevention and control filter device provided by this utility model.

[0025] Figure 5 is an exploded three-dimensional structural diagram of the mounting ring and slide bar of a water pollution prevention and control filter device provided by this utility model.

[0026] In the diagram: 1. Connector; 2. Liquid inlet assembly; 21. Circular plate; 22. Liquid inlet pipe; 23. Connecting pipe; 24. Solenoid valve; 25. Connecting ring; 26. Hollow seat; 27. Gear ring; 28. Gear; 29. ​​Servo motor; 3. Filter assembly; 31. Filter cartridge; 32. Hollow cylinder; 33. Slide groove; 34. Slide bar; 35. Mounting ring; 36. Connecting plate; 37. First square hole; 38. Second square hole; 39. Square rod; 310. Hollow ring; 311. Drain pipe; 312. Snap-in plate; 313. Handle. Detailed Implementation

[0027] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0028] Please refer to Figures 1-5. This utility model provides a technical solution: a filtration device for water pollution prevention and control, including a connector 1, a liquid inlet assembly 2, and a filter assembly 3. The filter assembly 3 is disposed outside the connector 1, and the liquid inlet assembly 2 is disposed above the filter assembly 3. The liquid inlet assembly 2 is used for sewage to enter the filter assembly 3, and the filter assembly 3 is used to filter the sewage. The liquid inlet assembly 2 includes a pair of circular plates 21, and the top of each pair of circular plates 21 is connected to a liquid inlet pipe 22. The two liquid inlet pipes 22 are located away from the circular plates 21. A connecting pipe 23 connects the two ends of the two inlet pipes 22. A solenoid valve 24 is installed at the end of each inlet pipe 22 away from the connecting pipe 23. A hollow seat 26 is provided at the bottom end of each pair of circular plates 21. A connecting ring 25 is provided at the bottom end of each hollow seat 26. A pipe is connected to the end of each solenoid valve 24 away from the inlet pipe 22. Both pipes extend through the circular plates 21 and the hollow seats 26 to the interior of the hollow seats 26 at the end away from the solenoid valves 24. The filter assembly 3 includes a pair of filter cartridges 31, which are respectively installed on the connecting pipe 23. On the outer sides of component 1, and with the top surfaces of a pair of filter cylinders 31 fixedly connected to the bottom surfaces of a pair of connecting rings 25 respectively, the solenoid valve 24 at the left inlet pipe 22 is opened, and the solenoid valve 24 at the right inlet pipe 22 is closed. Wastewater enters the interior of the left filter cylinder 31 through the connecting pipe 23, the left inlet pipe 22, and the left hollow seat 26. Through the combined use of coarse filter screen, fine filter screen, and ultrafiltration membrane, the wastewater undergoes multi-stage filtration, gradually removing impurities and pollutants of different sizes from the wastewater, improving the accuracy and quality of filtration. When the left... When a lot of impurities accumulate on the surface of the coarse and fine filter screens inside the side filter cartridge 31, close the solenoid valve 24 at the left inlet pipe 22 and open the solenoid valve 24 at the right inlet pipe 22 to change the sewage flow path. This allows the sewage to enter the interior of the right filter cartridge 31 through the connecting pipe 23, the right inlet pipe 22, and the right hollow seat 26. At the same time, remove the hollow cylinder 32 inside the left filter cartridge 31, along with its internal mounting ring 35, coarse filter screen, fine filter screen, and ultrafiltration membrane. This avoids downtime and improves filtration efficiency.

[0029] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0030] Please refer to Figures 1-5. This utility model provides a technical solution: A long opening is provided on one side of the bottom end of the hollow seat 26. The top and bottom surfaces of the hollow seat 26 are respectively connected to the bottom surface of the circular plate 21 and the top surface of the connecting ring 25 via bearings. A toothed ring 27 is fitted on the outside of the hollow seat 26. A rotating shaft is rotatably connected between the opposite sides of the circular plate 21 and the connecting ring 25. A gear 28 is fitted on the outside of the rotating shaft. The gear 28 meshes with the toothed ring 27. A servo motor 29 is installed on one side of the top surface of the circular plate 21. The output end of the servo motor 29 is fixedly connected to the rotating shaft. Sealing rings are connected to the inner walls of the through holes of the two hollow seats 26. Two liquid inlet pipes 2... The outer wall of the 2 is clearance-fitted with the inner wall of the two sealing rings. When the servo motor 29 works, it drives the rotating shaft and gear 28 to rotate. The gear 28 meshes with the gear ring 27, thereby driving the hollow seat 26 to rotate. When sewage enters the filter cylinder 31 through the inlet pipe 22 and the hollow seat 26, the sewage can be more evenly distributed in the filter cylinder 31, avoiding excessive local filtration pressure and improving filtration efficiency and effect. By setting the sealing ring, the inner wall of the sealing ring is clearance-fitted with the outer wall of the inlet pipe 22, preventing sewage from leaking from the connection between the inlet pipe 22 and the hollow seat 26 without affecting the rotation of the hollow seat 26, thus ensuring the sealing and normal operation of the device.

[0031] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0032] Please refer to Figures 1-5. This utility model provides a technical solution: A hollow ring 310 is connected to the bottom of the inner part of a pair of filter cylinders 31. A hollow cylinder 32 is provided at the upper end of the hollow ring 310. Sliding grooves 33 are provided on both sides of the inner wall of the hollow cylinder 32. Sliding strips 34 are provided inside each pair of sliding grooves 33. Three mounting rings 35 are slidably arranged between the pair of sliding strips 34. The three mounting rings 35 are arranged sequentially from top to bottom, and a coarse filter screen, a fine filter screen, and a filter membrane are respectively connected inside the three mounting rings 35. The outer wall of the sliding strip 34 slides in conjunction with the inner wall of the sliding groove 33. Notches are provided on both sides of the outer side of the mounting plate. The inner wall of the mounting plate slides against the outer wall of the slide bar 34. A connecting plate 36 is connected to both sides of the notch at the bottom of the mounting plate. Each pair of connecting plates 36 has a first square hole 37 inside. A second square hole 38 is formed inside the slide bar 34 at the location of the first square hole 37. A square rod 39 is provided between the opposing second square hole 38 and the pair of first square holes 37. The outer wall of the square rod 39 slides against the inner walls of the first square hole 37 and the second square hole 38. Each pair of filter cylinders 31 has a locking inlet on the side away from the connecting bar. A locking plate 312 is provided inside the locking inlet. The outer wall of the locking plate 312 is flush with the inner wall of the locking inlet. The filter cylinders 31 and 32 are fitted together, with one side of the insert plate 312 fixedly connected to the outer wall of the hollow cylinder 32. A pair of handles 313 are connected to the side of the insert plate 312 away from the hollow cylinder 32. Each pair of filter cylinders 31 has a drain pipe 311 connected to its bottom end. A valve is connected to the end of the drain pipe 311 away from the filter cylinder 31. Support legs are connected to both sides of the outer surface of each pair of filter cylinders 31. Through the combined use of coarse filter screens, fine filter screens, and ultrafiltration membranes, multi-stage filtration of wastewater is achieved, gradually removing impurities and pollutants of different sizes from the wastewater, improving the accuracy and quality of filtration. The valves are opened and closed in conjunction with the drain pipes 311. It can open and close the drain pipe 311. When it is necessary to maintain the coarse filter, fine filter and ultrafiltration membrane, the handle 313 is used to remove the locking plate 312 from the locking port, and the slide bar 34 is pulled upward to separate the two slide bars 34 from the two slide grooves 33. The coarse filter, fine filter and ultrafiltration membrane are taken out of the hollow cylinder 32 as a whole. Then, by pulling the square rod 39 outward, the square rod 39 is separated from the first square hole 37 and the second square hole 38. Under the action of the notch and the slide bar 34, the mounting ring 35 is removed from the slide bar 34. The coarse filter, fine filter and ultrafiltration membrane set on the three mounting rings 35 are cleaned.

[0033] Specifically, the working principle of this water pollution control filtration device is as follows: During use, open the solenoid valve 24 at the left inlet pipe 22 and close the solenoid valve 24 at the right inlet pipe 22. When the servo motor 29 is working, it drives the rotating shaft and gear 28 to rotate. The gear 28 meshes with the gear ring 27, thereby driving the hollow seat 26 to rotate. When sewage enters the filter cylinder 31 through the inlet pipe 22 and the hollow seat 26, the sewage can be more evenly distributed within the filter cylinder 31, avoiding excessive local filtration pressure and improving filtration efficiency and effect. Sewage enters the interior of the left filter cylinder 31 through the connecting pipe 23, the left inlet pipe 22, and the left hollow seat 26. Through the combined use of coarse filter screen, fine filter screen, and ultrafiltration membrane, the sewage undergoes multi-stage filtration, gradually removing impurities and pollutants of different sizes from the sewage, improving the precision and quality of filtration. When the coarse filter screen inside the left filter cylinder 31... When a large amount of impurities accumulate on the surface of the filter screen and the fine filter screen, close the solenoid valve 24 at the left inlet pipe 22 and open the solenoid valve 24 at the right inlet pipe 22 to change the sewage flow path, so that the sewage enters the interior of the right filter cylinder 31 through the connecting pipe 23, the right inlet pipe 22, and the right hollow seat 26. At the same time, remove the left retaining plate 312 from the retaining port by using the handle 313, and pull the slide bar 34 upward to separate the two slide bars 34 from the two slide grooves 33, so that the coarse filter screen, the fine filter screen, and the ultrafiltration membrane can be removed from the interior of the hollow cylinder 32 as a whole. Then, pull the square rod 39 outward to separate the square rod 39 from the first square hole 37 and the second square hole 38, and remove the mounting ring 35 from the slide bar 34 under the action of the notch and the slide bar 34. Clean the coarse filter screen, the fine filter screen, and the ultrafiltration membrane set on the three mounting rings 35, thereby avoiding downtime operation and improving filtration efficiency.

Claims

1. A filtration device for water pollution control, characterized in that, The system includes a connector (1), an inlet assembly (2), and a filter assembly (3). The filter assembly (3) is located outside the connector (1), and the inlet assembly (2) is located above the filter assembly (3). The inlet assembly (2) is used for wastewater to enter the filter assembly (3), and the filter assembly (3) is used to filter the wastewater. The inlet assembly (2) includes a pair of circular plates (21), and each of the top ends of the pair of circular plates (21) is connected to an inlet pipe (22). A connecting pipe (23) is connected between the two inlet pipes (22) at the ends away from the circular plates (21). Each of the two inlet pipes (22) is equipped with a connecting pipe (23) at the ends away from the connecting pipe (23). There is a solenoid valve (24), and a hollow seat (26) is provided at the bottom of each of the two circular plates (21). A connecting ring (25) is provided at the bottom of each of the two hollow seats (26). The two solenoid valves (24) are connected to a pipe at the end away from the liquid inlet pipe (22). The two pipes extend through the circular plate (21) and the hollow seat (26) to the interior of the hollow seat (26) at the end away from the solenoid valve (24). The filter assembly (3) includes a pair of filter cylinders (31). The pair of filter cylinders (31) are respectively installed on the outer sides of the connector (1), and the top surfaces of the pair of filter cylinders (31) are respectively fixedly connected to the bottom surfaces of the pair of connecting rings (25).

2. The filtration device for water pollution control according to claim 1, characterized in that, The hollow seat (26) has a long opening on one side of its bottom end. The top and bottom surfaces of the hollow seat (26) are connected to the bottom surface of the circular plate (21) and the top surface of the connecting ring (25) respectively by bearings. A toothed ring (27) is fitted on the outside of the hollow seat (26). A rotating shaft is rotatably connected between the opposite sides of the circular plate (21) and the connecting ring (25). A gear (28) is fitted on the outside of the rotating shaft. The gear (28) meshes with the toothed ring (27). A servo motor (29) is installed on one side of the top surface of the circular plate (21). The output end of the servo motor (29) is fixedly connected to the rotating shaft.

3. The filtration device for water pollution control according to claim 1, characterized in that, The inner walls of the through holes of the two hollow seats (26) are connected with sealing rings, and the outer walls of the two liquid inlet pipes (22) are respectively fitted with the inner walls of the two sealing rings.

4. A filtration device for water pollution control according to claim 1, characterized in that, Hollow rings (310) are connected to the bottom of the inner walls of each pair of filter cylinders (31). Hollow cylinders (32) are provided at the upper ends of the hollow rings (310). Sliding grooves (33) are provided on both sides of the inner wall of the hollow cylinders (32). Sliding strips (34) are provided inside each pair of sliding grooves (33). Three mounting rings (35) are slidably arranged between the pair of sliding strips (34). The three mounting rings (35) are arranged sequentially from top to bottom, and coarse filter screen, fine filter screen and ultrafiltration membrane are respectively connected inside the three mounting rings (35).

5. A filtration device for water pollution control according to claim 4, characterized in that, The outer wall of the slide bar (34) slides in conjunction with the inner wall of the slide groove (33). The outer sides of the mounting plate are provided with notches, and the inner walls of the notches slide in conjunction with the outer walls of the slide bar (34). The bottom of the mounting plate is connected to the connecting plates (36) on both sides of the notches. The inner walls of the pair of connecting plates (36) are provided with first square holes (37). The inner walls of the slide bar (34) are provided with second square holes (38) at the first square holes (37). A square rod (39) is provided between the second square holes (38) and the pair of first square holes (37). The outer wall of the square rod (39) slides in conjunction with the inner walls of the first square holes (37) and the second square holes (38).

6. A filtration device for water pollution control according to claim 5, characterized in that, Each of the filter cylinders (31) has a slot on the side away from the connecting strip. The slot is provided with a slot plate (312). The outer wall of the slot plate (312) is fitted with the inner wall of the slot. One side of the slot plate (312) is fixedly connected to the outer wall of the hollow cylinder (32). A pair of handles (313) are connected to the slot plate (312) on the side away from the hollow cylinder (32).

7. A filtration device for water pollution control according to claim 6, characterized in that, The bottom ends of each pair of filter cylinders (31) are connected to drain pipes (311), and the drain pipes (311) are connected to valves at the ends away from the filter cylinders (31). Support legs are connected to both sides of the outer sides of each pair of filter cylinders (31).

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