A paperboard production wastewater treatment and recycling device

Abstract

The application relates to the technical field of paperboard production wastewater treatment, and discloses a paperboard production wastewater treatment and recycling device, which comprises a guide pipe, a shunt frame, a filter cartridge and a liquid storage frame. Two water inlet pipes and two elbow pipes are arranged in the guide pipe in a communication mode, the two water inlet pipes are located above the two elbow pipes, a top cover is threadedly connected to the top end of the guide pipe, an annular plate is fixedly installed in the guide pipe, and a supporting ring is fixedly installed in the guide pipe. The device is provided with a valve-free switching structure of the magnetic sealing plugging and bypass elbow pipe, the valve-free switching structure is used for realizing the non-stop cleaning and replacement of the first-stage filter plate, a double-path sealing switching structure of the shaft-driven shunt plate is used for realizing the non-stop replacement and maintenance of the deep filter cartridge, the industry pain points that the traditional paperboard wastewater treatment device must be completely stopped, the wastewater treatment process is interrupted, and the continuous operation rhythm of the paperboard production line is dragged are solved, and the wastewater treatment efficiency and the production line adaptability are greatly improved.

Description

Technical Field

[0001] This invention relates to the field of wastewater treatment technology in paperboard production, specifically to a wastewater treatment and recycling device for paperboard production. Background Technology

[0002] Paperboard production is a water-intensive industry. The wastewater generated during the production process contains a large amount of pulp fiber, suspended particulate matter and organic pollutants. Direct discharge will cause serious environmental pollution and waste of water resources. Efficient treatment and recycling of wastewater is the core requirement for paperboard manufacturers to reduce costs, increase efficiency and achieve green production. Current wastewater treatment devices for paperboard production mostly adopt single-stage or multi-stage integrated filtration structures. When the filter media becomes clogged, the entire line must be shut down for replacement, which cannot meet the requirements of continuous operation of paperboard production lines. Frequent shutdowns not only significantly reduce wastewater treatment efficiency but also disrupt the normal production rhythm of the paperboard production line. Some devices with non-stop switching functions rely on multiple sets of electric valves and complex control systems, which are cumbersome in structure, have a high failure rate, and high operation and maintenance costs, making them difficult to widely apply in small and medium-sized paperboard production enterprises. Meanwhile, existing devices mostly use a single filtration structure, which cannot achieve graded interception of suspended solids in cardboard wastewater with a wide range of particle sizes. The filter media is prone to rapid clogging, and it is difficult to balance filtration accuracy and service life. Furthermore, the wastewater treatment and reuse stages are set up separately, which requires a large area and cannot achieve closed-loop on-site reuse of wastewater. In summary, existing devices can no longer meet the industry's needs for continuous, low-cost, and refined wastewater treatment and reuse. Summary of the Invention

[0003] To address the shortcomings of existing technologies, this invention provides a wastewater treatment and recycling device for paperboard production, thereby solving the problems mentioned in the background section.

[0004] To achieve the above objectives, the present invention provides the following technical solution: A wastewater treatment and recycling device for paperboard production includes: a guide pipe, a diversion frame, a filter cylinder, and a liquid storage frame; The guide tube is internally connected to two water inlet pipes and two bends, with the two water inlet pipes located above the two bends. A top cover is threaded to the top of the guide tube. An annular plate is fixedly installed inside the guide tube, and multiple magnet plates are fixedly installed on the outer side of the annular plate. A support ring is fixedly installed inside the guide tube, located above the annular plate. A filter plate is positioned above the support ring, and a mounting block is movably fitted to the bottom of the filter plate. Magnet blocks are fixedly installed at both the top and bottom of the mounting block. A support rod is fixedly installed at the top of the mounting block, and a sealing plate is movably fitted to the bottom of the mounting block, located between the support ring and the annular plate. An annular mesh is movably fitted inside the guide tube, and two movable rods are fixedly installed at the top of the annular mesh. The bottom end of the guide tube is connected to the diversion frame, and the inside of the diversion frame is rotatably connected to the shaft. A diversion plate is fixedly installed on the outside of the shaft, and sealing strips are fixedly installed around the diversion plate. One end of the shaft passes through the side wall of the diversion frame, and a turntable is fixedly installed at the end of the shaft that passes through the diversion frame. A pointer plate is fixedly installed on the outside of the turntable. Two limiting plates are fixedly installed on the outside of the diversion frame. The bottom of the diversion frame is connected to two threaded cylinders, and the outside of each of the two threaded cylinders is threadedly connected to the filter cylinder. Multiple filter cottons are fixedly installed inside each of the two filter cylinders. A connecting rod is fixedly installed on the outside of the diversion frame, and a spray pipe is fixedly installed at the bottom end of the connecting rod; two fixing plates are fixedly installed on the outside of the diversion frame, and the liquid storage frame is fixedly installed at the bottom end of the two fixing plates, with a drainage pipe connected inside the liquid storage frame.

[0005] Preferably, the two water inlet pipes are symmetrically distributed along the central axis of the guide pipe, and the two bends are symmetrically distributed along the central axis of the guide pipe, with the axis of the water inlet pipe and the axis of the bend parallel to each other.

[0006] Preferably, the inner diameter of the support ring is smaller than the outer diameter of the filter plate, the outer diameter of the mounting block is smaller than the inner diameter of the support ring, and the outer diameter of the sealing plate is larger than the inner diameter of the annular plate.

[0007] Preferably, the central axis of the rotating shaft coincides with the central axis of the diverter frame, the outer diameter of the diverter plate is adapted to the inner diameter of the diverter frame, the two limiting plates are symmetrically distributed along the central axis of the rotating shaft, and the side of the pointer plate is movably fitted with the side of the limiting plate.

[0008] Preferably, the two threaded cylinders are symmetrically distributed along the central axis of the diverter frame, the external threads of the threaded cylinders are adapted to the internal threads of the filter cylinders, and the plurality of filter cottons are equidistantly distributed along the axial direction of the filter cylinders.

[0009] Preferably, the outer diameter of the annular mesh is adapted to the inner diameter of the guide tube, the two movable rods are symmetrically distributed along the central axis of the annular mesh, and the top of the movable rods extends to the top opening of the guide tube.

[0010] Preferably, the spray pipe is located above the liquid storage frame, the axis of the spray pipe is parallel to the top surface of the liquid storage frame, and the nozzle of the spray pipe faces the internal cavity of the liquid storage frame.

[0011] Preferably, the plurality of magnet plates are evenly distributed along the circumference of the annular plate, and the top surface of the magnet plates is flush with the top surface of the annular plate.

[0012] Compared with the prior art, the beneficial effects of the present invention are: 1. This wastewater treatment and recycling device for cardboard production features a dual-station, non-stop filter media replacement structure, ensuring continuous operation and adapting to the continuous production line requirements. The device achieves non-stop cleaning and replacement of the primary filter plate through a valveless switching structure using magnetic sealing and bypass bends; and achieves non-stop replacement and maintenance of the deep filter cartridge through a dual-path sealing switching structure driven by a rotating shaft. This completely solves the industry pain point of traditional cardboard wastewater treatment devices requiring a complete shutdown for filter media replacement, interrupting the wastewater treatment process and slowing down the continuous operation of the cardboard production line, significantly improving wastewater treatment efficiency and production line adaptability.

[0013] 2. This wastewater treatment and recycling device for paperboard production features a gradient multi-stage filtration structure that progressively traps impurities, improving both anti-clogging performance and filtration accuracy. Addressing the characteristics of paperboard production wastewater—high pulp fiber content and a wide range of suspended solids particle sizes—this device employs a gradient filtration structure consisting of a primary coarse filtration plate, a secondary fine filtration ring mesh, and a multi-layered filter cotton for deep filtration within the filter cartridge. This progressively traps impurities of different particle sizes, preventing rapid clogging of a single filter medium and significantly extending the filter replacement cycle. Simultaneously, it achieves refined filtration of wastewater, effectively reducing the load on subsequent degradation treatments and ensuring stable effluent quality that meets standards.

[0014] 3. This wastewater treatment and recycling device for cardboard production features a valveless magnetic suction sealing and switching structure. Its simple and reliable design significantly improves ease of operation. Through the cooperation of the magnetic plate on the annular plate, the upper and lower magnetic suction structure of the mounting block, and the sealing plate, the device eliminates the need for complex electric valve assemblies. Seamless switching between the main filtration water path and the bypass water path can be achieved simply by pushing and pulling the support rod. The simple structure and reliable sealing allow for quick filter plate replacement by a single person. This solves the problems of complex valve structures, high failure rates, and high maintenance costs associated with traditional non-stop switching systems, thus lowering the operational threshold and maintenance costs.

[0015] 4. This wastewater treatment and recycling device for paperboard production features an integrated closed-loop treatment and reuse structure, which occupies a small area and has a high resource utilization rate. This device integrates the functions of pretreatment filtration, deep filtration, chemical degradation, and liquid storage and reuse into one unit, eliminating the need for separate sedimentation tanks, filtration tanks, reaction tanks, and other civil engineering facilities, thus significantly reducing the equipment footprint. The treated wastewater can be directly reused in the pulping and rinsing stages of paperboard production through a diversion pipe, realizing the closed-loop recycling of wastewater. This effectively reduces the fresh water consumption and wastewater treatment costs in paperboard production, perfectly adapting to the site conditions and capacity requirements of small and medium-sized paperboard production lines. Attached Figure Description

[0016] Figure 1 This is a three-dimensional schematic diagram of the structure of the present invention; Figure 2 This is a rear view schematic diagram of the structure of the present invention; Figure 3 This is a three-dimensional schematic diagram of the flow divider and its related structures of the present invention; Figure 4 This is a front sectional view of the flow divider and its related structures of the present invention; Figure 5 This is a frontal sectional view of the guide tube of the present invention; Figure 6 This is a three-dimensional schematic diagram of the guide tube and related structures of the present invention; Figure 7 This is a three-dimensional schematic diagram of the top cover and related structures of the present invention; Figure 8 This is a three-dimensional schematic diagram of the ring mesh and related structures of the present invention; Figure 9 This is a three-dimensional schematic diagram of the filter cartridge and related structures of the present invention.

[0017] In the diagram: 1. Guide pipe; 2. Inlet pipe; 3. Bend; 4. Top cover; 5. Annular plate; 6. Magnetic plate; 7. Support ring; 8. Filter plate; 9. Mounting block; 10. Sealing plate; 11. Annular mesh; 12. Moving rod; 13. Diverter frame; 14. Rotating shaft; 15. Diverter plate; 16. Turntable; 17. Pointer plate; 18. Limiting plate; 19. Threaded cylinder; 20. Filter cylinder; 21. Connecting rod; 22. Spray pipe; 23. Fixing plate; 24. Liquid storage frame; 25. Drain pipe; 26. Filter cotton; 27. Support rod. Detailed Implementation

[0018] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0019] Example: Please refer to the following: Figure 1-9 , A wastewater treatment and recycling device for paperboard production includes: a guide pipe 1, a diversion frame 13, a filter cylinder 20, and a liquid storage frame 24; The guide pipe 1 is internally connected to two water inlet pipes 2 and two bends 3, with the two water inlet pipes 2 located above the two bends 3. A top cover 4 is threaded to the top of the guide pipe 1. An annular plate 5 is fixedly installed inside the guide pipe 1, and multiple magnet plates 6 are fixedly installed on the outside of the annular plate 5. A support ring 7 is fixedly installed inside the guide pipe 1, located above the annular plate 5. A filter plate 8 is installed above the support ring 7, and a mounting block 9 is movably attached to the bottom of the filter plate 8. Magnet blocks are fixedly installed at both the top and bottom of the mounting block 9. A support rod 27 is fixedly installed at the top of the mounting block 9, and a sealing plate 10 is movably attached to the bottom of the mounting block 9, located between the support ring 7 and the annular plate 5. An annular mesh 11 is movably attached inside the guide pipe 1, and two movable rods 12 are fixedly installed at the top of the annular mesh 11. A diversion frame 13 is connected to the bottom end of the guide tube 1. A rotating shaft 14 is rotatably connected inside the diversion frame 13. A diversion plate 15 is fixedly installed on the outside of the rotating shaft 14. Sealing strips are fixedly installed around the diversion plate 15. One end of the rotating shaft 14 passes through the side wall of the diversion frame 13. A turntable 16 is fixedly installed at the end of the rotating shaft 14 that passes through the diversion frame 13. A pointer plate 17 is fixedly installed on the outside of the turntable 16. Two limit plates 18 are fixedly installed on the outside of the diversion frame 13. Two threaded cylinders 19 are connected to the bottom of the diversion frame 13. Filter cylinders 20 are threadedly connected to the outside of both threaded cylinders 19. Multiple filter cotton 26 are fixedly installed inside both filter cylinders 20. A connecting rod 21 is fixedly installed on the outside of the diversion frame 13, and a spray pipe 22 is fixedly installed at the bottom end of the connecting rod 21; two fixing plates 23 are fixedly installed on the outside of the diversion frame 13, and a liquid storage frame 24 is fixedly installed at the bottom end of the two fixing plates 23; a drainage pipe 25 is connected inside the liquid storage frame 24. Specifically, the pretreatment pipeline structure is as follows: the two inlet pipes 2 and the two bends 3 are all connected to the internal cavity of the guide pipe 1. The inner end opening of the inlet pipe 2 is located in the upper part of the inner cavity of the guide pipe 1, and the inner end opening of the bend 3 is located in the lower part of the inner cavity of the guide pipe 1, forming a fluid channel with upper and lower layers. The internal thread of the top cover 4 and the external thread at the top of the guide pipe 1 form a threaded engagement, which can be screwed to seal or open the top opening of the guide pipe 1. The primary filtration and non-stop replacement structure is as follows: the annular plate 5 and the support ring 7 are coaxially fixed to the inner wall of the guide tube 1, the support ring 7 is located directly above the annular plate 5, and the two are axially spaced apart; the magnet plate 6 is fixed to the top surface of the annular plate 5; the filter plate 8 is placed on the top surface of the support ring 7 to form a primary filtration channel; the top magnet of the mounting block 9 magnetically attaches to the bottom surface of the filter plate 8, and the bottom magnet of the mounting block 9 magnetically attaches to the top surface of the sealing plate 10; the support rod 27 is vertically fixed to the top surface of the mounting block 9, which can drive the mounting block 9 to slide vertically up and down along the axial direction of the guide tube 1; the sealing plate 10 can move down with the mounting block 9, attach to the top surface of the annular plate 5, and magnetically fix with the magnet plate 6; Two-stage filtration structure: The annular mesh 11 is coaxially attached to the inner wall of the guide tube 1, located below the opening of the bend 3, forming a two-stage filtration channel; the movable rod 12 is vertically fixed to the top surface of the annular mesh 11, with its top end extending to the top opening of the guide tube 1, which can drive the annular mesh 11 to slide vertically up and down along the axial direction of the guide tube 1. The diversion and switching structure is as follows: the top opening of the diversion frame 13 is coaxially connected to the bottom opening of the guide tube 1, forming a fluid transition cavity; the rotating shaft 14 passes through the side wall of the diversion frame 13 laterally and can rotate around its own axis; the diversion plate 15 is coaxially fixed to the outside of the rotating shaft 14 and rotates synchronously with the rotating shaft 14; the sealing strips around the diversion plate 15 are in contact with the inner wall of the diversion frame 13 to form a sealed partition; the turntable 16 is coaxially fixed to the outer end of the rotating shaft 14; the pointer plate 17 is fixed to the outside of the turntable 16 and rotates synchronously with the turntable 16; two limiting plates 18 are fixed to the outer wall of the diversion frame 13 and are located on both sides of the turntable 16 respectively; the side of the pointer plate 17 can be in contact with the side of the limiting plate 18 to limit the rotation stroke of the rotating shaft 14. Deep filtration structure: Two threaded cylinders 19 are symmetrically connected at the bottom of the diversion frame 13. The diversion plate 15 can be rotated to isolate the communication channel between one of the threaded cylinders 19 and the diversion frame 13. The internal thread of the filter cylinder 20 and the external thread of the threaded cylinder 19 form a threaded engagement, which can be screwed on for installation or disassembly. Multiple filter cotton 26 are fixed in sequence along the axial direction of the filter cylinder 20 on its inner wall to form a multi-stage deep filtration channel. Degradation and reuse structure: The top end of the connecting rod 21 is fixedly connected to the outer wall of the diversion frame 13, and the bottom end is fixedly connected to the spray pipe 22, forming a support structure for the spray pipe 22; two fixing plates 23 are symmetrically fixed to the outer wall of the diversion frame 13, and the bottom end is fixedly connected to the top surface of the liquid storage frame 24, forming a support structure for the liquid storage frame 24; the liquid storage frame 24 is located directly below the filter cartridge 20 and receives the water flowing out of the filter cartridge 20; the nozzle of the spray pipe 22 faces the internal cavity of the liquid storage frame 24; the inner end of the drainage pipe 25 is connected to the internal cavity of the liquid storage frame 24, and the outer end extends to the outside of the liquid storage frame 24; In the embodiment: two water inlet pipes 2 are symmetrically distributed along the central axis of the guide pipe 1, and two bend pipes 3 are symmetrically distributed along the central axis of the guide pipe 1. The axis of the water inlet pipe 2 and the axis of the bend pipe 3 are parallel to each other. Specifically, the two inlet pipes 2 are arranged symmetrically at 180° with the central axis of the guide pipe 1 as the axis of symmetry, and the inner openings of the two inlet pipes 2 are opposite to each other, so that wastewater can enter the inner cavity of the guide pipe 1 simultaneously from both sides; the two bends 3 are arranged symmetrically at 180° with the central axis of the guide pipe 1 as the axis of symmetry, and the inner openings of the two bends 3 are opposite to each other; the central axis of the inlet pipe 2 and the central axis of the bend 3 are completely parallel to each other, ensuring that the fluid direction of the inlet and outlet water is consistent and there is no turbulence interference; In the embodiment: the inner diameter of the support ring 7 is smaller than the outer diameter of the filter plate 8, the outer diameter of the mounting block 9 is smaller than the inner diameter of the support ring 7, and the outer diameter of the sealing plate 10 is larger than the inner diameter of the annular plate 5. Specifically, the inner edge of the support ring 7 can support the outer edge of the filter plate 8, preventing the filter plate 8 from falling out of the inner hole of the support ring 7; the mounting block 9 can pass through the inner hole of the support ring 7 without obstruction and slide up and down along the axial direction; the outer edge of the sealing plate 10 can completely cover the inner hole of the annular plate 5, and when it is in contact with the top surface of the annular plate 5, it can completely block the inner hole channel of the annular plate 5. In the embodiment: the central axis of the rotating shaft 14 coincides with the central axis of the diverter frame 13, the outer diameter of the diverter plate 15 is adapted to the inner diameter of the diverter frame 13, the two limiting plates 18 are symmetrically distributed along the central axis of the rotating shaft 14, and the side of the pointer plate 17 is movably attached to the side of the limiting plate 18. Specifically, the central axis of the rotating shaft 14 is completely coincident with the transverse central axis of the diverter frame 13, and there is no eccentricity or radial movement during rotation; the outer diameter of the diverter plate 15 matches the inner diameter of the diverter frame 13, and the sealing strip around it can always be tightly fitted with the inner wall of the diverter frame 13 during rotation, forming a gapless sealing partition; the two limiting plates 18 are arranged symmetrically at 180° with the central axis of the rotating shaft 14 as the axis of symmetry. When the pointer plate 17 rotates to fit with one of the limiting plates 18, the diverter plate 15 completely blocks the threaded cylinder 19 channel on the corresponding side and opens the threaded cylinder 19 channel on the other side; In the embodiment: two threaded cylinders 19 are symmetrically distributed along the central axis of the diversion frame 13, the external threads of the threaded cylinders 19 are adapted to the internal threads of the filter cylinder 20, and multiple filter cottons 26 are equidistantly distributed along the axial direction of the filter cylinder 20. Specifically, the two threaded cylinders 19 are arranged symmetrically at 180° with the vertical central axis of the diversion frame 13 as the axis of symmetry; the outer diameter of the external thread of the threaded cylinder 19 matches the inner diameter of the internal thread of the filter cylinder 20, and there is no radial gap between them when they are screwed together, and the thread fit is tight, forming a sealed fluid channel; multiple filter cottons 26 are arranged at equal intervals along the axial direction of the filter cylinder 20, and the axial distance between adjacent filter cottons 26 is equal. When the wastewater flows through the filter cylinder 20, it passes through each layer of filter cotton 26 in sequence. In the embodiment: the outer diameter of the ring net 11 is adapted to the inner diameter of the guide tube 1, and the two moving rods 12 are symmetrically distributed along the central axis of the ring net 11, with the top of the moving rod 12 extending to the top opening of the guide tube 1. Specifically, the outer diameter of the ring mesh 11 matches the inner diameter of the guide pipe 1, and its outer circumferential surface is tightly fitted with the inner wall of the guide pipe 1 without radial gaps. Wastewater flowing through the guide pipe 1 must completely pass through the mesh of the ring mesh 11. The two moving rods 12 are arranged symmetrically at 180° with the central axis of the ring mesh 11 as the axis of symmetry. The top of the moving rod 12 extends to the top opening of the guide pipe 1. After opening the top cover 4, the ring mesh 11 can be slid upward along the axial direction of the guide pipe 1 by lifting the moving rod 12 and taken out from the top opening of the guide pipe 1. In the embodiment: the spray pipe 22 is located above the liquid storage frame 24, the axis of the spray pipe 22 is parallel to the top surface of the liquid storage frame 24, and the nozzle of the spray pipe 22 faces the internal cavity of the liquid storage frame 24. Specifically, the central axis of the spray pipe 22 is completely parallel to the top surface of the liquid storage frame 24, and the nozzle of the spray pipe 22 is vertically downward toward the internal cavity of the liquid storage frame 24. The liquid in the spray pipe 22 can be evenly sprayed into the water body inside the liquid storage frame 24 through the nozzle. In the embodiment: multiple magnet plates 6 are evenly distributed along the circumference of the annular plate 5, and the top surface of the magnet plates 6 is flush with the top surface of the annular plate 5. Specifically, multiple magnet plates 6 are evenly arranged at equal intervals along the circumference with the central axis of the annular plate 5 as the center; the top surface of the magnet plate 6 is on the same horizontal plane as the top surface of the annular plate 5. When the sealing plate 10 is attached to the top surface of the annular plate 5, it can be completely attached to the top surface of all the magnet plates 6 at the same time to form a uniform magnetic fixation. Working principle: Step 1: Complete wastewater treatment during normal operation of the equipment: Initial setup of the device: The top cover 4 is screwed onto the top of the guide tube 1, sealing the top opening of the guide tube 1; the top magnet of the mounting block 9 is magnetically attached to the bottom surface of the filter plate 8, and the filter plate 8 is supported on the top surface of the support ring 7; the bottom magnet of the mounting block 9 is magnetically attached to the top surface of the sealing plate 10, and the sealing plate 10 is suspended between the support ring 7 and the annular plate 5, with the central inner hole of the annular plate 5 in a fully open state; the annular mesh 11 is attached to the lower part of the inner wall of the guide tube 1, located below the opening of the bend 3; the rotating shaft 14 drives the diversion plate 15 to the initial open position, and the channels of the diversion frame 13 and the two threaded cylinders 19 are both in a open state, and the two filter cylinders 20 are fixed to the outside of the threaded cylinders 19 by screwing them together; the spray pipe 22 is connected to the external degradation agent supply pipeline, and the drainage pipe 25 of the storage frame 24 is connected to the external reuse pipeline; Wastewater inlet and primary filtration: Two inlet pipes 2 are connected to the paperboard production wastewater conveying pipeline. The wastewater enters the upper part of the inner cavity of the guide pipe 1 simultaneously through the two symmetrically arranged inlet pipes 2 and falls evenly to the top surface of the filter plate 8. Large particulate suspended solids, pulp fibers and other impurities in the wastewater are intercepted by the filter plate 8. The filtered wastewater passes through the filter holes of the filter plate 8 and flows downward through the central inner hole of the support ring 7. Secondary filtration of wastewater: After primary filtration, the wastewater flows downward through the central inner hole of the annular plate 5 and to the top surface of the annular mesh 11; the fine suspended impurities in the wastewater are intercepted a second time by the annular mesh 11, and the wastewater that has completed secondary filtration passes through the mesh of the annular mesh 11 and flows into the internal cavity of the diversion frame 13 through the bottom opening of the guide pipe 1. Diversion and Deep Filtration: After the wastewater enters the diversion frame 13, it flows into the interior of the two filter cylinders 20 through the two symmetrical threaded cylinders 19 at the bottom. The wastewater passes through multiple layers of equally spaced filter cotton 26 from top to bottom in the filter cylinder 20. The tiny colloids and residual suspended solids in the wastewater are intercepted layer by layer. The wastewater that has completed deep filtration flows out from the bottom opening of the filter cylinder 20 and falls into the liquid storage frame 24 below. Chemical degradation and treatment completed: The external degradation agent is evenly sprayed into the water body in the storage frame 24 through the nozzle of the spray pipe 22, and is fully mixed with the wastewater to complete the degradation treatment of organic pollutants in the wastewater; the treated water body is temporarily stored in the storage frame 24 after meeting the standards. Step 2: Replace the primary filter plate without shutting down the machine (Step 8): Preparation before replacing filter plate 8: Keep the water inlet pipe 2 continuously supplying water and the device running normally. Unscrew the top cover 4 at the top of the guide pipe 1 to expose the internal cavity of the guide pipe 1 and the support rod 27. Magnetic fixing of sealing plate 10 and water path switching: Press down on the support rod 27 to drive the mounting block 9 to move vertically downward along the axis of the guide pipe 1; the mounting block 9 drives the filter plate 8 and the sealing plate 10 to move downward synchronously. When the sealing plate 10 moves down to fit against the top surface of the annular plate 5, stop pressing down on the support rod 27; at this time, the magnet plates 6 evenly distributed around the top surface of the annular plate 5 magnetically fit against the bottom surface of the sealing plate 10, firmly fixing the sealing plate 10 to the top surface of the annular plate 5. The sealing plate 10 completely seals the central inner hole of the annular plate 5, cutting off the original downward water flow channel; Filter plate 8 removal and water circuit switching: Pull the support rod 27 upward, causing the mounting block 9 to move vertically upward along the axis; the magnet at the bottom of the mounting block 9 separates from the magnetically fixed sealing plate 10, and at the same time, the magnet at the top of the mounting block 9 causes the filter plate 8 to move upward synchronously, lifting the filter plate 8 from the support ring 7, and finally removing it from the top opening of the guide pipe 1; at this time, the wastewater level in the guide pipe 1 continues to rise. When the water level rises to the height of the inner opening of the bend 3, the wastewater flows out of the guide pipe 1 through the two symmetrical bends 3 and directly into the internal cavity of the diversion frame 13. The device continues to maintain the wastewater treatment operation state without shutdown or interruption; Filter plate 8 cleaning, replacement and resetting: Clean the removed filter plate 8 or replace it with a new filter plate 8. Magnetically attach the replaced filter plate 8 to the magnet block on top of the mounting block 9. Push the support rod 27 downwards, moving the mounting block 9 and filter plate 8 down to the top surface of the support ring 7. Continue pressing down the support rod 27, causing the magnet block at the bottom of the mounting block 9 to magnetically attach to the top surface of the sealing plate 10 again. Continue pressing down the support rod 27, causing the sealing plate 10 to separate from the magnet plate 6, releasing the blockage of the inner hole of the annular plate 5 and restoring the original downward water flow channel. Loosen the support rod 27 and tighten the top cover 4 back onto the top of the guide pipe 1, completing the non-stop replacement of the filter plate 8 and restoring the device to normal filtration process. Step 3: Replace the depth filter cartridge 20 without shutting down the machine: Water circuit switching before filter cartridge 20 replacement: Keep the device running continuously. When the filter cotton 26 in one of the filter cartridges 20 needs to be replaced, rotate the turntable 16 on the outside of the diversion frame 13 to drive the rotating shaft 14 to rotate around its own axis. The rotating shaft 14 drives the diversion plate 15 to rotate simultaneously. The sealing strip around the diversion plate 15 and the inner wall of the diversion frame 13 always keep sealed and close until the pointer plate 17 on the turntable 16 is in contact with the side of the limit plate 18 on the other side, and then stop rotating the turntable 16. At this time, the diversion plate 15 completely blocks the threaded cylinder 19 channel on the corresponding side of the filter cartridge 20 to be replaced. All the wastewater is diverted to the spare filter cartridge 20 on the other side for deep filtration. The device continues to maintain the wastewater treatment operation state. Filter cartridge 20 disassembly and filter cotton 26 replacement: Rotate the filter cartridge 20 to be replaced to disengage its threaded connection with the threaded cylinder 19 and remove the filter cartridge 20 from the threaded cylinder 19; pour out the used filter cotton 26 inside the filter cartridge 20, replace it with new multi-layer filter cotton 26, and fix the filter cotton 26 at equal intervals along the axial direction of the filter cartridge 20. Filter cartridge 20 reset and water circuit restoration: Re-screw and fix the filter cartridge 20 with the replaced filter cotton 26 onto the threaded cylinder 19; rotate the turntable 16 in the opposite direction to drive the diverter plate 15 to reset to the initial conduction position, restore the synchronous conduction state of the two filter cartridges 20, or maintain the state of single-sided conduction and the other side as standby, to complete the non-stop replacement of the filter cartridge 20. Step 4: Cleaning and replacing ring net 11: With the device running normally or stopped, unscrew the top cover 4 at the top of the guide tube 1, grasp the two moving rods 12 symmetrically arranged at the top of the ring net 11, and pull them vertically upwards, causing the ring net 11 to slide upwards along the inner wall of the guide tube 1, and finally take it out from the opening at the top of the guide tube 1. Rinse and clean the removed ring net 11 to remove trapped impurities, or replace it with a new ring net 11; push the cleaned or replaced ring net 11 down along the inner wall of the guide tube 1 to the initial installation position, and tighten the top cover 4 again to complete the cleaning and replacement of the ring net 11. Step 5: Recycling and reuse of treated wastewater and shutdown and cleaning of the equipment: Wastewater that has been degraded and treated to meet standards in the storage box 24 is extracted through the diversion pipe 25 and transported to the pulping, rinsing and other stages of paperboard production to achieve wastewater recycling. When the device needs to be shut down for overall cleaning, shut off the water supply to the inlet pipe 2, drain the residual water from the guide pipe 1, the diversion frame 13, the filter cylinder 20 and the liquid storage frame 24; disassemble the filter plate 8, the ring mesh 11 and the filter cylinder 20 in sequence, and thoroughly flush and clean all chambers, pipelines and filter elements of the device. After cleaning, reassemble and reset the components for future use.

[0020] 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 wastewater treatment and recycling device for paperboard production, characterized in that, include: Guide tube (1), diversion box (13), filter cartridge (20) and liquid storage box (24); The guide pipe (1) is internally connected to two water inlet pipes (2) and two bends (3), with the two water inlet pipes (2) located above the two bends (3); a top cover (4) is threaded to the top of the guide pipe (1); an annular plate (5) is fixedly installed inside the guide pipe (1), and multiple magnet plates (6) are fixedly installed on the outer side of the annular plate (5); a support ring (7) is fixedly installed inside the guide pipe (1), and the support ring (7) is located above the annular plate (5); above the support ring (7) is a... A filter plate (8) is provided, and a mounting block (9) is movably attached to the bottom of the filter plate (8). Magnet blocks are fixedly provided at the top and bottom of the mounting block (9). A support rod (27) is fixedly installed at the top of the mounting block (9), and a sealing plate (10) is movably attached to the bottom of the mounting block (9). The sealing plate (10) is located between the support ring (7) and the annular plate (5). An annular mesh (11) is movably attached inside the guide tube (1), and two movable rods (12) are fixedly installed at the top of the annular mesh (11). The bottom end of the guide tube (1) is connected to the diversion frame (13), and the inside of the diversion frame (13) is rotatably connected to the rotating shaft (14). The outside of the rotating shaft (14) is fixedly installed with a diversion plate (15), and the diversion plate (15) is fixedly installed with sealing strips around its perimeter. One end of the rotating shaft (14) passes through the side wall of the diversion frame (13), and the end of the rotating shaft (14) passing through the diversion frame (13) is fixedly installed with a turntable (16). The outside of the turntable (16) is fixedly installed with a pointer plate (17). Two limiting plates (18) are fixedly installed on the outside of the diversion frame (13). The bottom of the diversion frame (13) is connected to two threaded cylinders (19), and the outside of the two threaded cylinders (19) is threadedly connected to the filter cylinder (20). The inside of the two filter cylinders (20) is fixedly installed with multiple filter cotton (26). A connecting rod (21) is fixedly installed on the outside of the diversion frame (13), and a spray pipe (22) is fixedly installed at the bottom end of the connecting rod (21); two fixing plates (23) are fixedly installed on the outside of the diversion frame (13), and a liquid storage frame (24) is fixedly installed at the bottom end of the two fixing plates (23), and a drainage pipe (25) is connected inside the liquid storage frame (24).

2. The wastewater treatment and recycling device for paperboard production according to claim 1, characterized in that, The two water inlet pipes (2) are symmetrically distributed along the central axis of the guide pipe (1), and the two bend pipes (3) are symmetrically distributed along the central axis of the guide pipe (1). The axis of the water inlet pipe (2) is parallel to the axis of the bend pipe (3).

3. The wastewater treatment and recycling device for paperboard production according to claim 1, characterized in that, The inner diameter of the support ring (7) is smaller than the outer diameter of the filter plate (8), the outer diameter of the mounting block (9) is smaller than the inner diameter of the support ring (7), and the outer diameter of the sealing plate (10) is larger than the inner diameter of the annular plate (5).

4. The wastewater treatment and recycling device for paperboard production according to claim 1, characterized in that, The central axis of the rotating shaft (14) coincides with the central axis of the diverter frame (13), the outer diameter of the diverter plate (15) is adapted to the inner diameter of the diverter frame (13), the two limiting plates (18) are symmetrically distributed along the central axis of the rotating shaft (14), and the side of the pointer plate (17) is in contact with the side of the limiting plate (18).

5. The wastewater treatment and recycling device for paperboard production according to claim 1, characterized in that, Two threaded cylinders (19) are symmetrically distributed along the central axis of the diversion frame (13). The external thread of the threaded cylinder (19) is adapted to the internal thread of the filter cylinder (20). A plurality of filter cottons (26) are equidistantly distributed along the axial direction of the filter cylinder (20).

6. The wastewater treatment and recycling device for paperboard production according to claim 1, characterized in that, The outer diameter of the ring net (11) is adapted to the inner diameter of the guide tube (1), and the two moving rods (12) are symmetrically distributed along the central axis of the ring net (11). The top of the moving rod (12) extends to the top opening of the guide tube (1).

7. The wastewater treatment and recycling device for paperboard production according to claim 1, characterized in that, The spray pipe (22) is located above the liquid storage frame (24), the axis of the spray pipe (22) is parallel to the top surface of the liquid storage frame (24), and the nozzle of the spray pipe (22) faces the internal cavity of the liquid storage frame (24).

8. The wastewater treatment and recycling device for paperboard production according to claim 1, characterized in that, Multiple magnet plates (6) are evenly distributed along the circumference of the annular plate (5), and the top surface of the magnet plates (6) is flush with the top surface of the annular plate (5).

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