A multi-stage treatment device and process for wastewater used in water-based varnish production

Abstract

The present invention relates to the field of wastewater treatment technology, and more specifically, to a multi-stage wastewater treatment device and process for water-based varnish production, comprising a primary sedimentation tank and a secondary sedimentation tank located below the primary sedimentation tank. The primary and secondary sedimentation tanks are each provided with a dewatering structure for conveying bottom sludge upward and extruding and dewatering it. One side of the dewatering structure is connected to a slag discharge structure, and the outer side of the dewatering structure is sheathed with a cleaning component for cleaning the dewatering structure. The dewatering structure of the present invention can complete the dewatering of the sludge while conveying the sludge upward. The dewatering method is simple and quick. More importantly, it can facilitate the rapid return of the extruded water to the corresponding primary and secondary sedimentation tanks, thereby avoiding the need to design an additional water delivery structure to convey the extruded water back to the sedimentation tank.

Description

Technical Field

[0001] The present invention relates to the technical field of wastewater treatment, and in particular to a multi-stage treatment device and process for wastewater used in water-based varnish production. Background Art

[0002] The production of water-based varnishes generates large amounts of wastewater with complex compositions, including resins, pigments, solvents, surfactants, and other pollutants. If this wastewater is discharged directly without effective treatment, it will inevitably cause serious harm to the ecological environment.

[0003] At present, the treatment method for this type of wastewater is mostly to add the wastewater to a sedimentation tank, add flocculants for flocculation and sedimentation, and then discharge the sludge at the bottom for dehydration and drying to complete the rapid treatment of the wastewater. However, a single sedimentation tank is difficult to ensure the adequacy of sedimentation, and the wastewater generated during the sludge dewatering process needs to be transported back to the sedimentation tank through water supply equipment, which further reduces the convenience of wastewater treatment and increases the energy consumption of the water purification process. Summary of the Invention

[0004] In response to the problems in the prior art, the present invention provides a multi-stage treatment device and process for wastewater used in water-based varnish production to solve the problem that a single sedimentation tank is difficult to fully precipitate and the wastewater generated by sludge dehydration is inconvenient to transport back to the sedimentation tank.

[0005] The technical solution adopted by the present invention to solve its technical problems is a multi-stage wastewater treatment device for water-based varnish production, including a primary sedimentation tank and a secondary sedimentation tank located below the primary sedimentation tank. Both the primary sedimentation tank and the secondary sedimentation tank are provided with a dewatering structure for transporting the bottom sludge upward and squeezing and dehydrating it. One side of the dewatering structure is connected to the slag discharge structure, and the outer side of the dewatering structure is provided with a cleaning component for cleaning the dewatering structure.

[0006] Preferably, the bottoms of the primary sedimentation tank and the secondary sedimentation tank are both connected to an aggregate trough with an opening upward, the dehydration structure includes a conveying cylinder vertically fixedly connected to the bottom of the aggregate trough, the bottom of the conveying cylinder is provided with a slag inlet, the bottom of the conveying cylinder is sleeved with a sealing cylinder for closing the slag inlet, the top outer side of the sealing cylinder is connected to a movable plate that is sealingly and slidingly connected to the aggregate trough, a support spring is connected between the lower surface of the movable plate and the bottom of the aggregate trough, the upper end of the conveying cylinder is connected to a conical tube that is small at the top and large at the bottom, and a filter hole is provided on the conical tube, a vertical sleeve is provided in the primary sedimentation tank and the secondary sedimentation tank, the sleeve passes through the aggregate trough, the conveying cylinder and the conical tube and is rotatably connected to the aggregate trough, a spiral plate connected to the sleeve is provided in the conveying cylinder, and a conical spiral blade connected to the sleeve is provided in the conical tube, and a driving mechanism for driving the sleeve to rotate is installed at the bottom of the secondary sedimentation tank.

[0007] Preferably, the cleaning assembly is sleeved on the outside of the conical tube, and the cleaning assembly includes several groups of movable sheets arranged around the conical tube, the inner side surfaces of the movable sheets are connected with cleaning needles corresponding to the filter holes, and springs are connected between adjacent movable sheets. When the adjacent movable sheets are squeezed close together, a conical tube fitting with a larger upper part and a smaller lower part is formed, and a conical extrusion tube with a larger upper part and a smaller lower part is sleeved on the outside of the conical tube fitting, and the outer side of the conical extrusion tube is connected to the movable plate through a vertically arranged pull rod, and the slag discharge structure includes a discharge bin connected to the upper end of the conical tube, and the lower surface of the discharge bin is provided with a positioning slide corresponding to the movable sheet, and the upper end of the movable sheet is connected with a positioning slider, and the positioning slider is slidably connected to the positioning slide.

[0008] Preferably, the driving mechanism includes a driving motor fixedly mounted on the bottom of the secondary sedimentation tank, the output end of the driving motor is connected to a vertical driving shaft, the driving shaft passes through a sleeve and is rotationally connected to the sleeve, and the sleeve and the driving shaft are transmitted through an opening and closing assembly.

[0009] Preferably, the opening and closing assembly includes a driving ratchet fixedly connected to the upper end of the sleeve with the tooth surface facing upward, a driven ratchet vertically slidably connected to the driving shaft with the tooth surface facing downward, an annular positioning groove is provided on the outer side of the driven ratchet, and a support plate is rotatably connected to the outer side of the annular positioning groove through the annular positioning groove, and a vertically arranged push rod is fixedly connected to the side of the conical extrusion tube, and the upper end of the push rod is in extrusion contact with the lower surface of the support plate.

[0010] Preferably, the slag discharge structure includes a discharge shell connected to one side of the discharge bin, the sleeve passes through the discharge bin and is rotatably connected to the discharge bin, and the lower end of the discharge shell is connected to the slag discharge pipe.

[0011] Preferably, a heating plate is installed on the inner bottom of the discharge shell, and an exhaust window is detachably connected to the upper part of the discharge shell.

[0012] Preferably, the bottoms of the primary sedimentation tank and the secondary sedimentation tank are both funnel-shaped structures, and the lower ends of the funnel-shaped structures are connected to the aggregate trough.

[0013] Preferably, a tension spring is connected between the side of the positioning slider away from the driving shaft and the positioning slot.

[0014] A multi-stage treatment process for wastewater from water-based varnish production, using the above-mentioned multi-stage treatment device for wastewater from water-based varnish production, specifically comprises the following steps:

[0015] Step 1: transport the wastewater to the primary sedimentation tank and add flocculant to the primary sedimentation tank;

[0016] Step 2: After the flocculation in the primary sedimentation tank is completed, the dewatering structure transports the sludge at the bottom of the primary sedimentation tank upward and squeezes and dehydrates it. The water discharged by squeezing falls back into the primary sedimentation tank, and the dehydrated waste residue is discharged through the slag discharge structure;

[0017] Step 3: After the dehydration work of the dehydration structure is completed, the cleaning component cleans the dehydration structure, and at the same time, the water that has been precipitated in the primary sedimentation tank is transported to the secondary sedimentation tank, and new wastewater is added to the primary sedimentation tank;

[0018] Step 4: Add flocculant to the primary sedimentation tank and add flocculant to the secondary sedimentation tank again;

[0019] Step 5. After the sedimentation in the primary sedimentation tank is completed, the dewatering structure transports the sludge at the bottom of the primary sedimentation tank and the secondary sedimentation tank upward and squeezes the water out. The squeezed and discharged water falls back to the corresponding primary sedimentation tank and the secondary sedimentation tank, and the dehydrated waste residue is discharged through the slag discharge structure.

[0020] Beneficial effects of the present invention:

[0021] (1) The present invention discloses a multi-stage wastewater treatment device and process for water-based varnish production. The secondary sedimentation tank serves as a supplement to the primary sedimentation tank. When the primary sedimentation tank is fully precipitated, the secondary sedimentation tank can be used to perform secondary sedimentation, thereby improving the wastewater sedimentation effect. The dewatering structure can complete the dewatering of the sludge while transporting the sludge upward. The dewatering method is simple and fast. More importantly, the water discharged by the squeeze can be quickly returned to the corresponding sedimentation tank, thereby avoiding the need to design an additional water supply structure to transport the water discharged by the squeeze back to the sedimentation tank.

[0022] (2) The multi-stage treatment device and process for wastewater used in the production of water-based varnish described in the present invention is that when the driving mechanism drives the sleeve to rotate, the spiral plate and the conical spiral blades can be driven to rotate. The rotation of the spiral plate transports the sludge at the lower end of the conveying cylinder upward into the conical tube. The rotation of the conical spiral blades can drive the sludge to move further upward. Since the pitch and diameter of the conical spiral blades gradually decrease, the sludge is squeezed and dehydrated when being conveyed in the conical spiral blades. The squeezed and discharged water is discharged through the filter holes and falls back into the corresponding primary sedimentation tank and secondary sedimentation tank; the waste residue after squeezing and dehydration will enter the slag discharge structure for discharge;

[0023] (3) The multi-stage treatment device and process for wastewater used in the production of water-based varnish described in the present invention is that as the movable plate moves downward, the pull rod will move downward, thereby driving the conical extrusion tube to move downward; after the conical extrusion tube moves downward, the movable plate moves outward by relying on the spring to reset, and the cleaning needle is separated from the filter hole; after the sludge on the movable plate is discharged, the movable plate is reset by relying on the supporting spring, and pushes the pull rod to move upward, and the upward movement of the pull rod drives the conical extrusion tube to move upward, thereby squeezing all the movable plates to shrink inward, and after the movable plates shrink inward, the cleaning needle is driven to be inserted into the filter hole, pushing the sludge blocked in the filter hole back into the conical tube, thereby completing the cleaning of the filter hole; at the same time, the cleaning needle is inserted into the filter hole, which can also reduce the situation where wastewater splashes into the conical tube through the filter hole. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The present invention will be further described below with reference to the accompanying drawings and examples.

[0025] Figure 1 This is an axonometric diagram of a multi-stage wastewater treatment device for water-based varnish production according to the present invention;

[0026] Figure 2 It is a partial cross-sectional view of the multi-stage wastewater treatment device for water-based varnish production of the present invention;

[0027] Figure 3 for Figure 2 A magnified view of area A;

[0028] Figure 4 for Figure 2 A magnified schematic diagram of area B;

[0029] Figure 5 It is an axonometric view of the conveying cylinder of the present invention;

[0030] Figure 6 is an axonometric view of the spiral plate of the present invention;

[0031] Figure 7 It is an axonometric drawing of the movable sheet of the present invention;

[0032] Figure 8 is an axonometric view of the tapered extruded tube of the present invention;

[0033] In the figure: 1. Primary sedimentation tank; 2. Secondary sedimentation tank; 3. Support frame; 4. Aggregate trough; 5. Conveying cylinder; 6. Slag inlet; 7. Sealing cylinder; 8. Movable plate; 9. Support spring; 10. Conical tube; 11. Filter hole; 12. Sleeve; 13. Spiral plate; 14. Conical spiral blade; 15. Movable plate; 16. Cleaning needle; 17. Spring; 18. Conical extrusion tube; 19. Pull rod; 20. Discharge bin; 21. Positioning chute; 22. Positioning slider; 23. Driving motor; 24. Driving shaft; 25. Driving ratchet; 26. Driven ratchet; 27. Positioning protrusion; 28. Positioning groove; 29. Annular positioning groove; 30. Support plate; 31. Ejector rod; 32. Discharge shell; 33. Slag discharge pipe; 34. Exhaust window. DETAILED DESCRIPTION

[0034] In order to make the technical means, creative features, objectives and effects achieved by the present invention easier to understand, the present invention is further described below in conjunction with specific implementation methods.

[0035] As an embodiment of the present invention, Figures 1 to 8 As shown, the multi-stage treatment device for wastewater used in the production of water-based varnish described in the present invention includes a primary sedimentation tank 1 and a secondary sedimentation tank 2 located below the primary sedimentation tank 1. Both the primary sedimentation tank 1 and the secondary sedimentation tank 2 are provided with a dewatering structure for transporting the bottom sludge upward and squeezing it for dehydration. One side of the dewatering structure is connected to the slag discharge structure, and the outer side of the dewatering structure is provided with a cleaning component for cleaning the dewatering structure.

[0036] During use, wastewater can be transported to the primary sedimentation tank 1, and flocculants are added to the primary sedimentation tank 1. After flocculation in the primary sedimentation tank 1 is completed, the sludge at the bottom of the primary sedimentation tank 1 is transported upward and squeezed for dewatering by the dewatering structure. The squeezed and discharged water falls back into the primary sedimentation tank 1, and the dewatered waste residue is discharged through the slag discharge structure. After the dewatering work of the dewatering structure is completed, the dewatering structure is cleaned by the cleaning component, and the water that has settled in the primary sedimentation tank 1 is transported to the secondary sedimentation tank 2, and new wastewater is added to the primary sedimentation tank 1. In addition, when the flocculants are added to the primary sedimentation tank 1, the flocculants need to be added to the secondary sedimentation tank 2 again. After the sedimentation in the primary sedimentation tank 1 is completed, the sludge at the bottom of the primary sedimentation tank 1 and the secondary sedimentation tank 2 is transported upward and squeezed for drainage by the dewatering structure. The squeezed and discharged water falls back into the corresponding primary sedimentation tank 1 and the secondary sedimentation tank 2, and the dewatered waste residue is discharged through the slag discharge structure. The secondary sedimentation tank 2 serves as a supplement to the primary sedimentation tank 1 and can perform a second sedimentation work when the primary sedimentation tank 1 is fully settled, thereby improving the wastewater sedimentation effect. The dewatering structure can complete the dewatering of the sludge while transporting it upward. The dewatering method is simple and fast. More importantly, it can facilitate the rapid return of the extruded water to the corresponding sedimentation tank, thus avoiding the need to design an additional water delivery structure to transport the extruded water back to the sedimentation tank. It should be noted that a support frame 3 is connected between the primary sedimentation tank 1 and the secondary sedimentation tank 2 to ensure the stability between the primary sedimentation tank 1 and the secondary sedimentation tank 2.

[0037] In order to ensure the dehydration effect of the dehydration structure, as an embodiment of the present invention, the bottoms of the primary sedimentation tank 1 and the secondary sedimentation tank 2 of the present invention are both connected to an aggregate trough 4 with an opening upward, and the dehydration structure includes a conveying cylinder 5 vertically fixedly connected to the bottom of the aggregate trough 4, and a slag inlet 6 is provided at the bottom of the conveying cylinder 5. A sealing cylinder 7 for closing the slag inlet 6 is provided at the bottom of the conveying cylinder 5, and a movable plate 8 is connected to the outer side of the top of the sealing cylinder 7 with a sealing and sliding connection to the aggregate trough 4, and a support is connected between the lower surface of the movable plate 8 and the bottom of the aggregate trough 4. Spring 9, the upper end of the conveying cylinder 5 is connected to a tapered tube 10 with a small upper part and a large lower part, and a filter hole 11 is provided on the tapered tube 10. A vertical sleeve 12 is provided in the primary sedimentation tank 1 and the secondary sedimentation tank 2. The sleeve 12 passes through the aggregate trough 4, the conveying cylinder 5 and the tapered tube 10 and is rotatably connected to the aggregate trough 4. A spiral plate 13 connected to the sleeve 12 is provided in the conveying cylinder 5, and a conical spiral blade 14 connected to the sleeve 12 is provided in the tapered tube 10. A driving mechanism for driving the sleeve 12 to rotate is installed at the bottom of the secondary sedimentation tank 2.

[0038] When in use, the sludge deposited at the bottom of the primary sedimentation tank 1 and the secondary sedimentation tank 2 will accumulate in the aggregate trough 4. Due to the high density of the sludge, the pressure on the movable plate 8 increases. As the amount of sludge accumulated on the movable plate 8 increases, the movable plate 8 gradually moves downward. When the movable plate 8 drives the sealing cylinder 7 to move below the slag inlet 6, the sludge accumulated in the aggregate trough 4 will enter the conveying cylinder 5 through the slag inlet 6; when the driving mechanism drives the sleeve 12 to rotate, it can drive the spiral plate 13 and the conical spiral blade 14 to rotate. The rotation of the spiral plate 13 thereby conveys the sludge at the lower end of the conveying cylinder 5 upward into the conical pipe 10. Relying on the rotation of the conical spiral blade 14, the sludge can be driven to move further upward. Since the pitch and diameter of the conical spiral blade 14 gradually decrease, the sludge is squeezed and dehydrated when being conveyed in the conical spiral blade 14. The squeezed and discharged water is discharged through the filter hole 11 and falls back to the corresponding primary sedimentation tank 1 and secondary sedimentation tank 2; the waste residue after squeezing and dehydration will enter the slag discharge structure for discharge.

[0039] In order to reduce the blockage of the dehydration structure and ensure the dehydration effect of the dehydration structure, as an embodiment of the present invention, the cleaning assembly of the present invention is sleeved on the outside of the conical tube 10, and the cleaning assembly includes several groups of movable plates 15 arranged around the conical tube 10, and the inner side of the movable plate 15 is connected with a cleaning needle 16 corresponding to the filter hole 11, and a spring 17 is connected between adjacent movable plates 15. When the adjacent movable plates 15 are squeezed close together, a conical pipe fitting with a larger upper part and a smaller lower part is formed. The outer side of the conical pipe fitting is sleeved with a conical extrusion tube 18 with a larger upper part and a smaller lower part. The outer side of the conical extrusion tube 18 is connected to the movable plate 8 through a vertically arranged pull rod 19. The slag discharge structure includes a discharge bin 20 connected to the upper end of the conical tube 10, and the lower surface of the discharge bin 20 is provided with a positioning slide groove 21 corresponding to the movable plate 15. The upper end of the movable plate 15 is connected with a positioning slider 22, and the positioning slider 22 is slidably connected to the positioning slide groove 21.

[0040] During use, as the movable plate 8 moves downward, the pull rod 19 will be driven downward, thereby driving the conical extrusion tube 18 downward; after the conical extrusion tube 18 moves downward, the movable plate 15 relies on the spring 17 to reset and move outward, and the cleaning needle 16 is separated from the filter hole 11; after the sludge on the movable plate 8 is discharged, the movable plate 8 relies on the support spring 9 to reset and push the pull rod 19 to move upward. The upward movement of the pull rod 19 drives the conical extrusion tube 18 to move upward, thereby squeezing all the movable plates 15 to shrink inward. After the movable plates 15 shrink inward, the cleaning needle 16 is driven to be inserted into the filter hole 11, pushing the sludge blocked in the filter hole 11 back into the conical tube 10, thereby completing the cleaning of the filter hole 11; at the same time, the cleaning needle 16 is inserted into the filter hole 11, which can also reduce the situation where wastewater splashes into the conical tube 10 through the filter hole 11.

[0041] In order to facilitate the driving structure to dewater sludge in the primary sedimentation tank 1 and the secondary sedimentation tank 2, as an embodiment of the present invention, the driving mechanism of the present invention includes a driving motor 23 fixedly installed at the bottom of the secondary sedimentation tank 2, and the output end of the driving motor 23 is connected to a vertical driving shaft 24, and the driving shaft 24 passes through the sleeve 12 and is rotatably connected to the sleeve 12, and the sleeve 12 and the driving shaft 24 are transmitted through an opening and closing assembly.

[0042] During use, when the opening and closing component driving sleeve 12 and the driving shaft 24 are able to transmit, the driving motor 23 can be used to drive the driving shaft 24 to rotate, thereby driving the sleeve 12 to rotate. The rotation of the sleeve 12 can drive the spiral plate 13 and the conical spiral blade 14 to rotate, thereby driving the dehydration structure to realize the sludge transportation and dehydration of the primary sedimentation tank 1 and the secondary sedimentation tank 2.

[0043] In order to facilitate the opening and closing assembly to automatically transmit the sleeve 12 and the drive shaft 24, as an embodiment of the present invention, the opening and closing assembly of the present invention includes a driving ratchet 25 fixedly connected to the upper end of the sleeve 12 with the tooth surface facing upward, and a driven ratchet 26 with the tooth surface facing downward is vertically slidably connected to the drive shaft 24. An annular positioning groove 29 is provided on the outer side of the driven ratchet 26, and a support plate 30 is rotatably connected to the outer side of the annular positioning groove 29 through the annular positioning groove 29. A vertically arranged push rod 31 is fixedly connected to the side of the conical extrusion tube 18, and the upper end of the push rod 31 is in extrusion contact with the lower surface of the support plate 30.

[0044] When in use, as the movable plate 8 moves downward, the pull rod 19 will be driven downward, thereby driving the conical extrusion tube 18 downward. When the conical tube 10 moves downward, the push rod 31 will be driven downward, thereby causing the driven ratchet 26 to move downward. After the driven ratchet 26 moves downward, it engages with the driving ratchet 25. At this time, the drive shaft 24 and the sleeve 12 realize transmission. After that, the drive motor 23 is turned on to drive the sleeve 12 to rotate, thereby driving the dewatering structure to transport and dewater the sludge. After the sludge on the movable plate 8 is discharged, the movable plate 8 is turned on. The plate 8 is reset by the support spring 9 and pushes the pull rod 19 upward. The upward movement of the pull rod 19 drives the tapered extrusion tube 18 upward, thereby driving the push rod 31 upward, so that the driven ratchet 26 moves upward and disengages from the driving ratchet 25, disconnecting the transmission between the drive shaft 24 and the sleeve 12. After the drive shaft 24 and the sleeve 12 are disconnected, the resistance to the rotation of the drive shaft 24 can be effectively reduced, avoiding the situation where the dewatering structure is still connected to the drive shaft 24 when the sedimentation tank corresponding to the sleeve 12 does not need to be cleaned of sludge, thereby increasing the resistance to the operation of the drive shaft 24. It should be pointed out that in order to ensure the sliding effect of the driven ratchet 26 and the drive shaft 24, a positioning protrusion 27 is connected to the inner side of the driven ratchet 26, and a positioning groove 28 is provided on the drive shaft 24 to be slidably connected to the positioning protrusion 27.

[0045] In order to facilitate the slag discharge work of the slag discharge structure, as an embodiment of the present invention, the slag discharge structure of the present invention includes a discharge shell 32 connected to one side of the discharge bin 20, the sleeve 12 passes through the discharge bin 20 and is rotatably connected to the discharge bin 20, and the lower end of the discharge shell 32 is commonly connected to the slag discharge pipe 33.

[0046] During use, the sludge continues to move upward and is squeezed and dehydrated as the dewatering structure works. The water squeezed out is discharged through the filter hole 11 and falls back to the corresponding primary sedimentation tank 1 and secondary sedimentation tank 2. The waste residue after squeezing and dehydration will enter the discharge bin 20 of the slag discharge structure and be discharged to the slag discharge pipe 33 through the discharge shell 32. The processing equipment can be connected to the lower end of the slag discharge pipe 33 for subsequent processing.

[0047] In order to facilitate further drying of the dehydrated waste residue, as an embodiment of the present invention, a heating plate is installed on the inner bottom of the discharge shell 32, and an exhaust window 34 is detachably connected to the upper part of the discharge shell 32.

[0048] During use, the waste residue passes through the discharge bin 20 and enters the discharge housing 32. It then moves downward along the bottom of the discharge housing 32. The heating plate heats and dries the waste residue, and steam is discharged through the exhaust window 34. The dried waste residue enters the slag discharge pipe 33. It should be noted that, in order to ensure environmental protection, it is generally necessary to connect the exhaust window 34 to an exhaust gas treatment device to prevent harmful substances in the steam from polluting the environment.

[0049] In order to facilitate the convergence of the sludge box aggregate trough 4 at the bottom of the primary sedimentation tank 1 and the secondary sedimentation tank 2, as an embodiment of the present invention, the bottoms of the primary sedimentation tank 1 and the secondary sedimentation tank 2 of the present invention are both funnel-shaped structures, and the lower ends of the funnel-shaped structures are connected to the aggregate trough 4.

[0050] In order to further improve the convenience of resetting the movable plate 8, a tension spring is connected between the side of the positioning slider 22 away from the drive shaft 24 and the positioning slot 21. The design of the tension spring can further facilitate the outward movement of the movable plate 15 and the separation of the cleaning needle 16 from the filter hole 11 when the tapered extrusion tube 18 moves downward.

[0051] The present invention also provides a multi-stage treatment process for wastewater from water-based varnish production. The multi-stage treatment device for wastewater from water-based varnish production specifically comprises the following steps:

[0052] Step 1: transporting the wastewater to the primary sedimentation tank 1 and adding flocculant to the primary sedimentation tank 1;

[0053] Step 2: After the flocculation in the primary sedimentation tank 1 is completed, the dewatering structure transports the sludge at the bottom of the primary sedimentation tank 1 upward and squeezes and dehydrates it. The water discharged by squeezing falls back into the primary sedimentation tank 1, and the dehydrated waste residue is discharged through the slag discharge structure;

[0054] Step 3: After the dehydration work of the dehydration structure is completed, the cleaning component cleans the dehydration structure, and at the same time, the water that has been precipitated in the primary sedimentation tank 1 is transported to the secondary sedimentation tank 2, and new wastewater is added to the primary sedimentation tank 1;

[0055] Step 4: Add flocculant to the primary sedimentation tank 1 and add flocculant to the secondary sedimentation tank 2 again;

[0056] Step 5. After the sedimentation in the primary sedimentation tank 1 is completed, the dewatering structure transports the sludge at the bottom of the primary sedimentation tank 1 and the secondary sedimentation tank 2 upward and squeezes the water out. The squeezed and discharged water falls back to the corresponding primary sedimentation tank 1 and the secondary sedimentation tank 2, and the dehydrated waste residue is discharged through the slag discharge structure.

[0057] When the present invention is in use, wastewater is transported to the primary sedimentation tank 1, and flocculant is added to the primary sedimentation tank 1; after the flocculation in the primary sedimentation tank 1 is completed, the sludge in the primary sedimentation tank 1 will accumulate in the aggregate trough 4, and as the amount of sludge accumulated on the movable plate 8 increases, the movable plate 8 gradually moves downward, and when the movable plate 8 drives the sealing cylinder 7 to move below the slag inlet 6, the sludge accumulated in the aggregate trough 4 will enter the conveying cylinder 5 through the slag inlet 6; as the movable plate 8 moves downward, the pull rod 19 will be driven downward, thereby driving the conical extrusion tube 18 to move downward, and when the conical tube 10 moves downward, the push rod 31 will be driven downward, thereby causing the driven ratchet 26 to move downward, and the driven ratchet 26 will engage with the driving ratchet 25 after moving downward, and at this time the driving shaft 24 and the sleeve 12 realize transmission; the driving motor 23 drives the driving shaft 24 to rotate, thereby driving the sleeve 12 to rotate, relying on the sleeve The rotation of 12 can drive the spiral plate 13 and the conical spiral blades 14 to rotate, thereby driving the dewatering structure to realize the sludge transportation and dewatering of the primary sedimentation tank 1; the waste residue after extrusion and dehydration will enter the discharge bin 20 of the slag discharge structure and be discharged to the slag discharge pipe 33 through the discharge shell 32, and can be connected to the processing equipment at the lower end of the slag discharge pipe 33 for subsequent treatment; the squeezed and discharged water is discharged through the filter hole 11 and falls back to the primary sedimentation tank 1; after the sludge on the movable plate 8 is discharged, the movable plate 8 relies on the support spring 9 to reset and push the pull rod 19 to move upward. The pull rod 19 moves upward to drive the conical extrusion tube 18 to move upward, thereby squeezing all the movable pieces 15 to retract inward. After the movable piece 15 retracts inward, it drives the cleaning needle 16 to insert into the filter hole 11, and pushes the sludge blocked in the filter hole 11 back into the conical tube 10, thereby completing the cleaning of the filter hole 11.

[0058] The settled water in the primary sedimentation tank 1 is then transported to the secondary sedimentation tank 2, and new wastewater is added to the primary sedimentation tank 1. While adding flocculants to the primary sedimentation tank 1, flocculants need to be added again to the secondary sedimentation tank 2. After the primary sedimentation tank 1 completes the second settling, the sludge at the bottom of the primary and secondary sedimentation tanks 1 and 2 is transported upward and squeezed out by the dewatering structure. The squeezed-out water then falls back into the corresponding primary and secondary sedimentation tanks 1 and 2, and the dewatered waste residue is discharged through the slag discharge structure.

[0059] The basic principles, main features, and advantages of the present invention are shown and described above. Those skilled in the art should understand that the present invention is not limited to the above-described embodiments. The above-described embodiments and descriptions are merely illustrative of the principles of the present invention. Various changes and modifications may be made to the present invention without departing from the spirit and scope of the present invention. Such changes and modifications are intended to fall within the scope of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A multi-stage treatment device for wastewater from water-based varnish production, characterized in that: The invention comprises a primary sedimentation tank (1) and a secondary sedimentation tank (2) located below the primary sedimentation tank (1). The primary sedimentation tank (1) and the secondary sedimentation tank (2) are both provided with a dewatering structure for transporting bottom sludge upward and squeezing and dewatering it. One side of the dewatering structure is connected to a slag discharge structure. The outer side of the dewatering structure is provided with a cleaning component for cleaning the dewatering structure. The bottoms of the primary sedimentation tank (1) and the secondary sedimentation tank (2) are both connected to an upwardly opening aggregate trough (4), the dehydration structure comprises a conveying cylinder (5) vertically fixedly connected to the bottom of the aggregate trough (4), the bottom of the conveying cylinder (5) is provided with a slag inlet (6), the bottom of the conveying cylinder (5) is sleeved with a sealing cylinder (7) for closing the slag inlet (6), the top outer side of the sealing cylinder (7) is connected to a movable plate (8) in sealing and sliding connection with the aggregate trough (4), a support spring (9) is connected between the lower surface of the movable plate (8) and the bottom of the aggregate trough (4), the upper end of the conveying cylinder (5) is connected to an upper A tapered tube (10) with a small bottom and a large bottom is provided, wherein a filter hole (11) is provided on the tapered tube (10), a vertical sleeve (12) is provided in each of the primary sedimentation tank (1) and the secondary sedimentation tank (2), wherein the sleeve (12) passes through the aggregate trough (4), the conveying cylinder (5) and the tapered tube (10) and is rotatably connected to the aggregate trough (4), a spiral plate (13) connected to the sleeve (12) is provided in the conveying cylinder (5), a tapered spiral blade (14) connected to the sleeve (12) is provided in the tapered tube (10), and a driving mechanism for driving the sleeve (12) to rotate is installed at the bottom of the secondary sedimentation tank (2); The cleaning assembly is sleeved on the outside of the conical tube (10), and the cleaning assembly includes a plurality of groups of movable sheets (15) arranged around the conical tube (10), the inner side of the movable sheet (15) is connected with a cleaning needle (16) corresponding to the filter hole (11), and a spring (17) is connected between adjacent movable sheets (15). When the adjacent movable sheets (15) are squeezed close together, a conical tube with a larger upper part and a smaller lower part is formed, and a conical extrusion tube (18) with a larger upper part and a smaller lower part is sleeved on the outer side of the conical tube, and the outer side of the conical extrusion tube (18) is connected to the movable plate (8) through a vertically arranged pull rod (19); The driving mechanism comprises a driving motor (23) fixedly mounted on the bottom of the secondary sedimentation tank (2); an output end of the driving motor (23) is connected to a vertical driving shaft (24); the driving shaft (24) passes through the sleeve (12) and is rotatably connected to the sleeve (12); the sleeve (12) and the driving shaft (24) are driven by an opening and closing assembly; The opening and closing assembly comprises a driving ratchet (25) fixedly connected to the upper end of the sleeve (12) and with its tooth surface facing upward, a driven ratchet (26) with its tooth surface facing downward being vertically slidably connected to the driving shaft (24), an annular positioning groove (29) being provided on the outer side of the driven ratchet (26), a supporting plate (30) being rotatably connected to the outer side of the annular positioning groove (29) through the annular positioning groove (29), a vertically arranged push rod (31) being fixedly connected to the side surface of the conical extrusion tube (18), and an upper end of the push rod (31) being in extrusion contact with the lower surface of the supporting plate (30).

2. A multi-stage treatment device for wastewater from water-based varnish production according to claim 1, characterized in that: The slag discharge structure comprises a discharge bin (20) connected to the upper end of the conical tube (10); a positioning chute (21) corresponding to the movable piece (15) is provided on the lower surface of the discharge bin (20); a positioning slider (22) is connected to the upper end of the movable piece (15); and the positioning slider (22) is slidably connected to the positioning chute (21).

3. A multi-stage treatment device for wastewater from water-based varnish production according to claim 2, characterized in that: The slag discharge structure comprises a discharge shell (32) connected to one side of the discharge bin (20), the sleeve (12) passes through the discharge bin (20) and is rotatably connected to the discharge bin (20), and the lower end of the discharge shell (32) is connected to the slag discharge pipe (33).

4. A multi-stage treatment device for wastewater from water-based varnish production according to claim 3, characterized in that: A heating plate is installed on the inner bottom of the discharge shell (32), and an exhaust window (34) is detachably connected to the upper portion of the discharge shell (32).

5. A multi-stage treatment device for wastewater from water-based varnish production according to any one of claims 1 to 4, characterized in that: The bottoms of the primary sedimentation tank (1) and the secondary sedimentation tank (2) are both funnel-shaped structures, and the lower ends of the funnel-shaped structures are connected to the aggregate trough (4).

6. A multi-stage treatment device for wastewater from water-based varnish production according to claim 2, characterized in that: A tension spring is connected between the side of the positioning slide block (22) away from the drive shaft (24) and the positioning slide groove (21).

7. A multi-stage treatment process for wastewater from water-based varnish production, characterized in that: The multi-stage treatment device for wastewater from water-based varnish production according to any one of claims 1 to 6 specifically comprises the following steps: Step 1: transporting the wastewater to a primary sedimentation tank (1), and adding a flocculant to the primary sedimentation tank (1); Step 2: After the flocculation of the primary sedimentation tank (1) is completed, the dewatering structure transports the sludge at the bottom of the primary sedimentation tank (1) upward and squeezes and dehydrates it. The water discharged by squeezing falls back into the primary sedimentation tank (1), and the dehydrated waste residue is discharged through the slag discharge structure; Step 3: After the dehydration work of the dehydration structure is completed, the cleaning component cleans the dehydration structure, and at the same time, the water body that has been precipitated in the primary sedimentation tank (1) is transported to the secondary sedimentation tank (2), and new wastewater is added to the primary sedimentation tank (1); Step 4: Add flocculant to the primary sedimentation tank (1) and add flocculant to the secondary sedimentation tank (2) again; Step 5: After the sedimentation in the primary sedimentation tank (1) is completed, the dewatering structure transports the sludge at the bottom of the primary sedimentation tank (1) and the secondary sedimentation tank (2) upward and squeezes out the water. The squeezed out water falls back into the corresponding primary sedimentation tank (1) and the secondary sedimentation tank (2), and the dewatered waste residue is discharged through the slag discharge structure.

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