Papermaking sewage treatment device and method

Abstract

The invention discloses a papermaking sewage treatment device and method, and relates to the technical field of sewage treatment device.The papermaking sewage treatment device comprises a pretreatment tank and a sedimentation tank, the output end of the pretreatment tank communicates with the feeding end of the sedimentation tank, and a mixing mechanism is arranged above the feeding end of the pretreatment tank and comprises a mixing barrel, a water injection pipe and a material pipe used for guiding a flocculating agent; and the mixing cylinder is arranged at the upper part in the pretreatment tank. After sewage is guided into the sedimentation tank to be settled, sediments approach to the spiral shaft, the sediments and part of the sewage are guided into the fixed pipe under the continuous and slow rotation of the spiral shaft, and the screw pitch of the spiral shaft is gradually reduced from top to bottom, so that the sediments are continuously compressed in the fixed pipe until the sewage is discharged into the outer pipe from the draining holes; dehydrated sediments are discharged from the slag discharge pipe, so that the sediments are continuously discharged in the precipitation process, the dehydration effect of the sediments is ensured, and a large amount of sewage is prevented from being discharged together during sewage discharge.

Description

Technical Field

[0001] The invention relates to the technical field of sewage treatment devices, in particular to a papermaking sewage treatment device and a method thereof. Background Art

[0002] With the acceleration of urbanization and industrialization in China, the demand gap for water resources is also increasing. Against this background, the sewage treatment industry has become an emerging industry. It is currently in the same important position as the tap water production, water supply, drainage, and reclaimed water reuse industries. Among them, the papermaking industry ranks first among the five major water-intensive industries in my country.

[0003] For example, a papermaking wastewater treatment device of "CN106946390A" includes a sedimentation tank, a vertical coagulation pipe is connected to the upper left side of the sedimentation tank, a stirring shaft is arranged inside the coagulation pipe, bearings are arranged at both left and right ends of the stirring shaft, the left and right ends of the stirring shaft are fixedly connected to the inner ring of the bearing, the outer end of the outer ring of the bearing is fixedly connected to the inner wall of the coagulation pipe through a connecting rod, a stirring blade is arranged on the outer wall of the stirring shaft, an ultrasonic generator is embedded on the inner wall of the coagulation pipe, a pulp recovery valve is installed at the lower middle end of the sedimentation tank, and a water outlet pipe is connected to the top of the sedimentation tank; this new type of papermaking wastewater treatment device has high wastewater treatment efficiency, high flocculant utilization rate, prevents coagulation pipe blockage, saves resources, has strong applicability, and is suitable for large-scale promotion;

[0004] In the above patent, the sewage treatment effect is achieved by adding flocculants to the sewage and stirring and then settling. However, when the sewage is precipitated in the sedimentation tank, a large amount of sediment accumulates at the sewage outlet at the lower end of the sedimentation tank after a period of time. When discharging sewage, the sewage outlet is usually opened directly. Under the action of gravity, the sludge accumulated at the sewage outlet is mixed with part of the sewage and discharged. When discharging sewage, more sewage will be taken away, affecting the collection and treatment of sewage and causing environmental pollution. Summary of the invention

[0005] In view of the above existing problems, the present invention is proposed.

[0006] The purpose of the present invention is to solve the problem in the prior art that when discharging sewage, the sewage outlet is usually opened directly, and the sludge accumulated at the sewage outlet is discharged mixed with part of the sewage under the action of gravity. When discharging sewage, a lot of sewage will be taken away, which affects the collection and treatment of sewage and causes environmental pollution.

[0007] In order to solve the above technical problems, the present invention provides the following technical solutions:

[0008] On the one hand, the present invention provides a papermaking wastewater treatment device, which includes a pretreatment tank and a sedimentation tank, wherein the output end of the pretreatment tank is connected to the feed end of the sedimentation tank, a mixing mechanism is provided above the feed end of the pretreatment tank, the mixing mechanism includes a mixing cylinder, a water injection pipe and a material pipe for guiding flocculants, the mixing cylinder is arranged above the interior of the pretreatment tank, the output end of the water injection pipe passes through the upper end of the mixing cylinder and extends to the interior to be connected with a water distribution pipe, the material pipe is arranged in the mixing cylinder, the output end of the water distribution pipe is located above the output end of the material pipe, a conical pipe connected to the outside is provided below the mixing cylinder, the inner wall of the sedimentation tank is annular, and the inside of the sedimentation tank is provided with a conical pipe connected to the outside. A funnel-shaped structure is arranged below the wall, a slag outlet is arranged at the center position of the lower end of the sedimentation tank, a slag removal mechanism is arranged at the slag outlet, the slag removal mechanism includes a mounting sleeve, a spiral shaft, an outer tube and a cleaning strip, a fixed tube is arranged on the inner wall of the slag outlet through the mounting sleeve, the spiral shaft is rotatably arranged on the inner wall of the fixed tube and the upper end is driven to rotate by a waterproof motor, the upper end of the fixed tube is connected to the interior of the sedimentation tank, the outer tube is sleeved on the outer wall of the fixed tube, a drainage hole is arranged on the side wall of the fixed tube and is connected to the outer tube, the pitch of the spiral shaft gradually decreases from top to bottom, a slag discharge pipe is arranged at the lower end of the fixed tube, and the cleaning strip is rotatably arranged at the bottom of the interior of the sedimentation tank.

[0009] Furthermore, a guide pipe is provided at the upper end of the pretreatment tank, and the guide pipe is replaced. One end of the guide pipe is connected to one end of the water injection pipe. Fan blades are provided at the lower part of the guide pipe for sealing and rotation. A plurality of fan blades are provided at intervals. The fan blades are arranged at the same height as the inside of the guide pipe and have a matching diameter. The guide pipe is used to supply water to the water injection pipe.

[0010] Furthermore, a plurality of stirring shafts are rotatably arranged in the pretreatment tank, a fixed frame is provided at the upper end of the pretreatment tank, the upper end of the stirring shaft is rotatably arranged on the fixed frame, the upper end of the fixed frame is assembled and connected with the guide pipe through a support frame, the upper end of the stirring shaft is linked with the fan blade through a connecting shaft, a water pump is provided outside the pretreatment tank, the lower water outlet on one side of the pretreatment tank is connected with the upper end of the sedimentation tank through the water pump, the mixed sewage in the pretreatment tank is introduced into the sedimentation tank for sedimentation treatment by pumping water through the water pump, when the sewage passes through the guide pipe, the sewage impacts the fan blade to rotate, driving the connecting shaft and the stirring shaft to rotate, so that the sewage flowing into the pretreatment tank is more fully mixed with the flocculant, ensuring the flocculation effect, and the fan blades are driven to rotate by the flow of sewage, thereby saving the purchase cost of the driving equipment when the stirring shaft rotates.

[0011] Furthermore, the material pipe is arranged in a ring shape in the upper middle part of the inner wall of the mixing cylinder, and a plurality of nozzles are connected to the material pipe. The output end of the nozzle is inclined toward the center position of the lower end of the mixing cylinder. The water distribution pipes are provided in multiple and distributed in a ring shape, and the lower end of the water distribution pipe is located directly above the output end of the nozzle. By arranging the output end of the water distribution pipe directly above the output end of the nozzle, the sprayed sewage is fully in contact with the flocculant sprayed by the nozzle.

[0012] Furthermore, the conical tube is arranged in a structure that is narrow at the top and wide at the bottom. The lower end of the conical tube is assembled and connected to the center position of the lower end of the mixing barrel, and the upper end of the conical tube extends to the upper part of the mixing barrel. Through the arranged conical tube, the sewage that initially contacts the flocculant can collide and mix between the outer wall of the conical tube and the inner wall of the mixing barrel. As the sewage increases, it gradually rises and is discharged from the upper end of the conical tube and flows into the pretreatment tank.

[0013] Furthermore, the spiral shaft comprises a front shaft, a middle shaft and a rear shaft, the pitches of the front shaft, the middle shaft and the rear shaft decrease successively, a sealing strip is provided at the edge of the spiral shaft and is slidably arranged with the inner wall of the fixed pipe, and the pitch of the spiral shaft is reduced successively from top to bottom, so that the sediment in the sewage just enters and gradually fills the space between the front shaft and the fixed pipe when it is between the front shaft, and when it passes through the middle shaft, the space is gradually compressed, and part of the sewage in the sediment is squeezed out, and when it passes through the rear shaft, the sewage in the sediment is basically squeezed out, and the squeezed sewage is discharged from the drain hole, and the squeezed sediment is discharged from the slag discharge pipe.

[0014] Furthermore, the mounting sleeve is a hollow structure and a rotating ring is provided at the upper inner portion for sealing and rotation, and a plurality of slots are opened on the rotating ring, and a plug shaft is provided in the slot for sealing and rotation, and a connecting ring is rotatably provided at the outer ring of the upper end of the mounting sleeve, and the end faces of the plurality of cleaning strips are assembled and connected with the connecting ring, and a slot and a limit block are respectively provided at the upper end of the connecting ring and the upper end edge of the spiral shaft, and a notch is formed between two adjacent limit blocks, and a limit plate is provided at the upper end of the plug shaft, and blocks which are engaged with the slot and the notch are respectively provided below the two ends of the limit plate. When cleaning the bottom of the sedimentation tank, the plug shaft is lifted into the sedimentation tank for a distance so that the limit plate is higher than the connecting ring and the limit block, and the plug shaft is rotated at a certain angle so that the two ends of the limit plate are respectively located above the connecting ring and the limit block, and the plug shaft is pulled down so that the block is engaged with the slot and the notch for limiting. At this time, when the spiral shaft rotates, the plug shaft and the rotating ring can be driven to rotate, and the plug shaft drives the connecting ring and the cleaning strip to rotate, so as to achieve the effect of rotating and cleaning the lower part of the inner wall of the sedimentation tank.

[0015] Furthermore, the lower end of the plug shaft passes through the bottom of the rotating ring and is assembled and connected through a fixed ring. A fixed support is provided under the fixed ring through a cylinder. The fixed support is assembled and connected to the lower end of the sedimentation tank. The lower end of the plug shaft is rotatably connected to the fixed ring and adjacent plug shafts are linked by belts. The upper end of the cylinder is slidably connected to the bottom of the fixed ring. The lower end of one plug shaft is driven to rotate by a first motor. By driving the first motor to rotate one plug shaft, all the plug shafts are driven to rotate by a certain angle. The lifting of the cylinder can drive the plug shaft to lift and lower, thereby realizing the engagement and separation operations of the limit plate, the cleaning strip and the spiral shaft.

[0016] Furthermore, a waterproof cover is provided at the center of the sedimentation tank, the upper end of the waterproof cover is arranged in a conical structure, the waterproof motor is arranged in the waterproof cover, the upper end of the spiral shaft is assembled and connected with the output end of the waterproof motor through a linkage shaft, and the waterproof cover is provided to support the waterproof motor and enhance the waterproof effect, thereby ensuring the normal use of the waterproof motor in sewage.

[0017] In another aspect, the present invention provides a method for using a papermaking wastewater treatment device, comprising:

[0018] Step S1, connecting the sewage to the water injection pipe and injecting it into the mixing drum through the water distribution pipe, introducing the prepared flocculant into the mixing drum through the material pipe and spraying it evenly, the sewage discharged through the water distribution pipe is evenly contacted and mixed with the flocculant, and then discharged from the conical pipe into the pretreatment tank;

[0019] Step S2, the sewage that has been preliminarily mixed with the flocculant enters the pretreatment tank, and the flow of sewage in the guide pipe drives the fan blades to rotate, and then drives the stirring shaft to rotate, so that the sewage in the pretreatment tank and the flocculant are fully mixed;

[0020] Step S3, the sewage in the pretreatment tank is introduced into the sedimentation tank by a water pump. After a period of sedimentation, the fibers or other fine sediments in the sewage are deposited at the bottom of the sedimentation tank;

[0021] Step S4, during the sedimentation process, the waterproof motor drives the spiral shaft to rotate slowly. During the slow rotation, the sediment and sewage are slowly rolled into the fixed pipe, and are squeezed through the front shaft, the middle shaft and the rear shaft in turn. The squeezed water is discharged from the drain hole into the outer pipe and flows into the next sewage treatment stage. Before the spiral shaft starts to rotate, the slag discharge pipe is blocked, and the spiral shaft is started to rotate. When the sediment enters the rear shaft and accumulates, the slag discharge pipe is opened for slag discharge;

[0022] Step S5, cleaning the inner wall of the sedimentation tank, by lifting the plug shaft into the sedimentation tank for a distance so that the limit plate is higher than the connecting ring and the limit block, rotating the plug shaft so that the two ends of the limit plate are respectively located above the connecting ring and the limit block, pulling down the plug shaft so that the block is engaged with the slot and the notch to limit the position, rotating the spiral shaft can drive the plug shaft and the rotating ring to rotate, and the plug shaft drives the connecting ring and the cleaning strip to rotate to clean the bottom of the pool.

[0023] The beneficial effects of the present invention are:

[0024] 1. After the sewage is introduced into the sedimentation tank for sedimentation, the sediment approaches the spiral shaft, and the sediment and part of the sewage are introduced into the fixed pipe under the continuous and slow rotation of the spiral shaft. The spiral shaft is set with a gradually decreasing pitch from top to bottom, so that the sediment is continuously compressed in the fixed pipe until the sewage is discharged from the drain hole into the outer pipe, and the dehydrated sediment is discharged from the slag discharge pipe, so that the sediment is continuously discharged during the sedimentation process, and the dehydration effect of the sediment is guaranteed, so as to avoid discharging a large amount of sewage together when discharging sewage.

[0025] 2. The sewage mixed in the sediment during slag discharge of the present invention is discharged from the drain hole, and the edge of the spiral shaft is always slidably connected with the inner wall of the fixed pipe, so that the sediment attached to the drain hole can be scraped off, ensuring that the drain hole can always work normally and avoid clogging.

[0026] 3. The present invention uses a water pump to pump water to introduce the mixed sewage in the pretreatment tank into the sedimentation tank for sedimentation treatment. When the sewage passes through the guide pipe, the sewage impacts the fan blades to rotate, driving the connecting shaft and the stirring shaft to rotate, so that the sewage flowing into the pretreatment tank is more fully mixed with the flocculant, ensuring the flocculation effect. The flow of sewage drives the fan blades to rotate, saving the cost of purchasing the driving equipment when the stirring shaft rotates.

[0027] 4. The present invention lifts the plug shaft into the sedimentation tank for a certain distance so that the limit plate is higher than the connecting ring and the limit block, and rotates the plug shaft at a certain angle so that the two ends of the limit plate are respectively located above the connecting ring and the limit block, and pulls down the plug shaft so that the block engages with the slot and the notch to limit the position. At this time, when the spiral shaft rotates, it can drive the plug shaft and the rotating ring to rotate, and the plug shaft drives the connecting ring and the cleaning strip to rotate, thereby achieving the effect of rotating and cleaning the lower part of the inner wall of the sedimentation tank. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying creative work.

[0029] Figure 1A three-dimensional diagram of a papermaking wastewater treatment device and method provided by the present invention;

[0030] Figure 2 A schematic diagram of the internal structure of a pretreatment tank of a papermaking wastewater treatment device and method provided by the present invention;

[0031] Figure 3 A schematic diagram of the internal structure of a guide pipe of a papermaking wastewater treatment device and method provided by the present invention;

[0032] Figure 4 A schematic diagram of the internal structure of a mixing drum of a papermaking wastewater treatment device and method provided by the present invention;

[0033] Figure 5 A schematic diagram of the positions of a mixing cylinder and a conical tube of a papermaking wastewater treatment device and method provided by the present invention;

[0034] Figure 6 A schematic diagram of the internal structure of a sedimentation tank of a papermaking wastewater treatment device and method provided by the present invention;

[0035] Figure 7 A schematic diagram of a slag removal mechanism of a papermaking wastewater treatment device and method provided by the present invention;

[0036] Figure 8 A schematic diagram of an installation sleeve of a papermaking wastewater treatment device and method provided by the present invention;

[0037] Fig. 9 A schematic diagram of the position of a fixed pipe and a spiral shaft of a papermaking wastewater treatment device and method provided by the present invention.

[0038] Legend:

[0039] 1. Pretreatment tank; 2. Sedimentation tank; 311. Mixing barrel; 312. Water injection pipe; 313. Material pipe; 314. Water distribution pipe; 315. Conical pipe; 4. Slag outlet; 511. Mounting sleeve; 512. Screw shaft; 513. Outer pipe; 514. Cleaning strip; 515. Fixed pipe; 516. Waterproof motor; 517. Drain hole; 518. Slag discharge pipe; 611. Flow guide pipe; 612. Fan blade; 613. Stirring shaft; 614. Fixed frame; 615. Support Support frame; 616, connecting shaft; 617, water pump; 7, nozzle; 811, front shaft; 812, middle shaft; 813, rear shaft; 911, rotating ring; 912, slot; 913, plug shaft; 914, connecting ring; 915, slot; 916, limit block; 917, limit plate; 918, block; 101, fixing ring; 102, cylinder; 103, fixing support; 104, belt; 105, first motor; 11, waterproof cover; 12, linkage shaft. DETAILED DESCRIPTION

[0040] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are described in detail below in conjunction with the accompanying drawings.

[0041] In the following description, many specific details are set forth to facilitate a full understanding of the present invention, but the present invention may also be implemented in other ways different from those described herein, and those skilled in the art may make similar generalizations without violating the connotation of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0042] Secondly, as referred to herein, "one embodiment" or "embodiment" refers to a specific feature, structure, or characteristic that can be included in at least one implementation of the present invention. The "in one embodiment" that appears in different places in this specification does not necessarily refer to the same embodiment, nor is it a separate or selective embodiment that is mutually exclusive with other embodiments.

[0043] See also Figure 1-Figure 9 The present invention provides a technical solution: a papermaking wastewater treatment device, including a pretreatment tank 1 and a sedimentation tank 2, the output end of the pretreatment tank 1 is connected to the feed end of the sedimentation tank 2, a mixing mechanism is provided above the feed end of the pretreatment tank 1, the mixing mechanism includes a mixing cylinder 311, a water injection pipe 312 and a material pipe 313 for guiding flocculants, the mixing cylinder 311 is arranged above the interior of the pretreatment tank 1, the output end of the water injection pipe 312 passes through the upper end of the mixing cylinder 311 and extends to the interior to be connected with a water distribution pipe 314, the material pipe 313 is arranged in the mixing cylinder 311, the output end of the water distribution pipe 314 is located above the output end of the material pipe 313, a conical pipe 315 connected to the outside is provided below the mixing cylinder 311, the inner wall of the sedimentation tank 2 is annular, and the inner wall of the sedimentation tank 2 is funnel-shaped below A slag outlet 4 is provided at the center of the lower end of the sedimentation tank 2, and a slag removal mechanism is provided at the slag outlet 4. The slag removal mechanism includes a mounting sleeve 511, a spiral shaft 512, an outer tube 513 and a cleaning strip 514. A fixed tube 515 is provided on the inner wall of the slag outlet 4 through the mounting sleeve 511. The spiral shaft 512 is rotatably arranged on the inner wall of the fixed tube 515 and the upper end is driven to rotate by a waterproof motor 516. The upper end of the fixed tube 515 is connected to the interior of the sedimentation tank 2. The outer tube 513 is sleeved on the outer wall of the fixed tube 515. A drainage hole 517 connected to the outer tube 513 is provided on the side wall of the fixed tube 515. The pitch of the spiral shaft 512 gradually decreases from top to bottom. A slag discharge pipe 518 is provided at the lower end of the fixed tube 515, and a cleaning strip 514 is rotatably arranged at the lower part of the interior of the sedimentation tank 2.

[0044] like Figure 1-Figure 9As shown, a guide pipe 611 is provided at the upper end of the pretreatment tank 1. The guide pipe 611 is replaced, and one end of the guide pipe 611 is connected to one end of the water injection pipe 312. A fan blade 612 is provided at the lower part of the guide pipe 611 for sealing and rotation. A plurality of fan blades 612 are provided at intervals. The fan blades 612 are arranged at the same height as the inside of the guide pipe 611 and have a matching diameter. The guide pipe 611 is used to supply water to the water injection pipe 312.

[0045] like Figure 1-Figure 9 As shown, a plurality of stirring shafts 613 are rotated in the pretreatment tank 1, a fixing frame 614 is provided at the upper end of the pretreatment tank 1, and the upper end of the stirring shaft 613 is rotatably set on the fixing frame 614, and the upper end of the fixing frame 614 is assembled and connected with the guide pipe 611 through a support frame 615, and the upper end of the stirring shaft 613 is linked with the fan blade 612 through a connecting shaft 616. A water pump 617 is provided outside the pretreatment tank 1, and a water outlet at the lower side of the pretreatment tank 1 is connected with the upper end of the sedimentation tank 2 through the water pump 617. The mixed sewage in the pretreatment tank 1 is introduced into the sedimentation tank 2 for sedimentation treatment by pumping water through the water pump 617. When the sewage passes through the guide pipe 611, the sewage impacts the fan blade 612 to rotate, driving the connecting shaft 616 and the stirring shaft 613 to rotate, so that the sewage flowing into the pretreatment tank 1 is more fully mixed with the flocculant to ensure the flocculation effect, and the fan blade 612 is driven to rotate by the flow of sewage, which saves the purchase cost of the driving equipment when the stirring shaft 613 rotates.

[0046] like Figure 1-Figure 9 As shown, the material pipe 313 is arranged in an annular shape in the middle and upper part of the inner wall of the mixing cylinder 311, and a plurality of nozzles 7 are connected to the material pipe 313. The output end of the nozzle 7 is inclined toward the center position of the lower end of the mixing cylinder 311. There are multiple water distribution pipes 314 and they are distributed in an annular shape. The lower end of the water distribution pipe 314 is located directly above the output end of the nozzle 7. By arranging the output end of the water distribution pipe 314 directly above the output end of the nozzle 7, the sprayed sewage is fully in contact with the flocculant sprayed by the nozzle 7.

[0047] like Figure 1-Figure 9 As shown, the conical tube 315 is arranged in a structure that is narrow at the top and wide at the bottom. The lower end of the conical tube 315 is assembled and connected to the center position of the lower end of the mixing drum 311, and the upper end of the conical tube 315 extends to the upper part of the mixing drum 311. Through the set conical tube 315, the sewage that initially contacts the flocculant can collide and mix between the outer wall of the conical tube 315 and the inner wall of the mixing drum 311. As the sewage increases, it gradually rises and is discharged from the upper end of the conical tube 315 and flows into the pretreatment tank 1.

[0048] like Figure 1-Figure 9As shown, the spiral shaft 512 includes a front shaft 811, a middle shaft 812 and a rear shaft 813, and the pitches of the front shaft 811, the middle shaft 812 and the rear shaft 813 decrease successively. A sealing strip is provided at the edge of the spiral shaft 512 and is slidably arranged with the inner wall of the fixed pipe 515. By reducing the pitch of the spiral shaft 512 from top to bottom, the sediment in the sewage just enters and gradually fills the space between the front shaft 811 and the fixed pipe 515 when it is between the front shaft 811. When passing through the middle shaft 812, the space is gradually compressed, and a part of the sewage in the sediment is squeezed out. When passing through the rear shaft 813, the sewage in the sediment is basically squeezed out, and the squeezed sewage is discharged from the drain hole 517, and the squeezed sediment is discharged from the slag discharge pipe 518.

[0049] like Figure 1-Figure 9 As shown, the mounting sleeve 511 is a hollow structure and a rotating ring 911 is provided on the upper part of the interior for sealing and rotation. A plurality of slots 912 are provided on the rotating ring 911. A plug shaft 913 is provided in the slot 912 for sealing and rotation. A connecting ring 914 is provided at the outer ring of the upper end of the mounting sleeve 511 for rotation. The end faces of a plurality of cleaning strips 514 are assembled and connected with the connecting ring 914. A card slot 915 and a limit block 916 are provided on the upper part of the connecting ring 914 and on the upper edge of the spiral shaft 512, respectively. A notch is formed between two adjacent limit blocks 916. A limit plate 917 is provided on the upper end of the plug shaft 913. A card slot 915 and a limit block 916 are provided at the lower part of both ends of the limit plate 917. The block 918 is arranged together, and when cleaning the bottom of the sedimentation tank 2, the plug shaft 913 is lifted into the sedimentation tank 2 for a distance so that the limit plate 917 is higher than the connecting ring 914 and the limit block 916, and the plug shaft 913 is rotated at a certain angle so that the two ends of the limit plate 917 are respectively located above the connecting ring 914 and the limit block 916, and the plug shaft 913 is pulled down so that the block 918 is engaged with the slot 915 and the notch to limit the position. At this time, when the spiral shaft 512 rotates, it can drive the plug shaft 913 and the rotating ring 911 to rotate, and the plug shaft 913 drives the connecting ring 914 and the cleaning strip 514 to rotate, thereby achieving the effect of rotating and cleaning the lower part of the inner wall of the sedimentation tank 2.

[0050] like Figure 1-Figure 9As shown, the lower end of the plug shaft 913 passes through the bottom of the rotating ring 911 and is assembled and connected through the fixed ring 101. A fixed support 103 is provided below the fixed ring 101 through a cylinder 102. The fixed support 103 is assembled and connected to the lower end of the sedimentation tank 2. The lower end of the plug shaft 913 is rotatably connected to the fixed ring 101 and adjacent plug shafts 913 are linked by belts 104. The upper end of the cylinder 102 is slidably connected to the bottom of the fixed ring 101. The lower end of an plug shaft 913 is driven to rotate by a first motor 105. The first motor 105 is linked with the fixed ring 101. By driving the first motor 105, one plug shaft 913 is driven to rotate, and then all the plug shafts 913 are driven to rotate a certain angle. The lifting and lowering of the cylinder 102 can drive the plug shaft 913 to lift and lower, thereby realizing the engagement and separation operations of the limit plate 917 with the cleaning strip 514 and the spiral shaft 512.

[0051] like Figure 1-Figure 9 As shown, a waterproof cover 11 is provided at the center of the sedimentation tank 2. The upper end of the waterproof cover 11 is in a conical structure. The waterproof motor 516 is arranged in the waterproof cover 11. The upper end of the spiral shaft 512 is assembled and connected with the output end of the waterproof motor 516 through a linkage shaft 12. The waterproof cover 11 is provided to support the waterproof motor 516 and enhance the waterproof effect, thereby ensuring the normal use of the waterproof motor 516 in sewage.

[0052] Working principle:

[0053] Step S1, the sewage is connected to the water injection pipe 312 and injected into the mixing drum 311 through the water distribution pipe 314, the flocculant prepared in advance is introduced into the mixing drum 311 through the material pipe 313 and sprayed evenly, the sewage discharged through the water distribution pipe 314 is evenly contacted and mixed with the flocculant, and then discharged from the tapered pipe 315 into the pretreatment tank 1;

[0054] Step S2, the sewage that has been preliminarily mixed with the flocculant enters the pretreatment tank 1, and the flow of sewage in the guide pipe 611 drives the fan blade 612 to rotate, and then drives the stirring shaft 613 to rotate, so that the sewage and flocculant in the pretreatment tank 1 are fully mixed;

[0055] Step S3: The sewage in the pretreatment tank 1 is introduced into the sedimentation tank 2 by the water pump 617. After a period of sedimentation, the fibers or other fine sediments in the sewage are deposited at the bottom of the sedimentation tank 2.

[0056] Step S4, during the sedimentation process, the waterproof motor 516 is driven to drive the spiral shaft 512 to rotate slowly. During the slow rotation, the sediment and sewage are slowly rolled into the fixed pipe 515, and are squeezed through the front shaft 811, the middle shaft 812 and the rear shaft 813 in sequence. The squeezed water is discharged from the drain hole 517 into the outer pipe 513 and flows into the next sewage treatment stage. Before the spiral shaft 512 starts to rotate, the slag discharge pipe 518 is blocked, and the spiral shaft 512 is started to rotate. When the sediment enters the rear shaft 813 and accumulates, the slag discharge pipe 518 is opened for slag discharge;

[0057] Step S5, cleaning the inner wall of the sedimentation tank 2, by lifting the plug shaft 913 into the sedimentation tank 2 for a distance so that the limit plate 917 is higher than the connecting ring 914 and the limit block 916, rotating the plug shaft 913 so that the two ends of the limit plate 917 are respectively located above the connecting ring 914 and the limit block 916, pulling down the plug shaft 913 so that the block 918 is engaged with the slot 915 and the notch to limit the position, rotating the spiral shaft 512 can drive the plug shaft 913 and the rotating ring 911 to rotate, and the plug shaft 913 drives the connecting ring 914 and the cleaning strip 514 to rotate to clean the bottom of the pool.

[0058] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should all be included in the scope of the claims of the present invention.

Claims

1. A papermaking wastewater treatment device, comprising a pretreatment tank (1) and a sedimentation tank (2), wherein the output end of the pretreatment tank (1) is connected to the feed end of the sedimentation tank (2), characterized in that: A mixing mechanism is provided above the feed end of the pretreatment tank (1), the mixing mechanism comprising a mixing cylinder (311), a water injection pipe (312) and a material pipe (313) for guiding flocculants. The mixing cylinder (311) is arranged above the interior of the pretreatment tank (1). The output end of the water injection pipe (312) passes through the upper end of the mixing cylinder (311) and extends to the interior to be connected with a water distribution pipe (314). The material pipe (313) is arranged in the mixing cylinder (311). The output end of the water distribution pipe (314) is located above the output end of the material pipe (313). A conical pipe (315) connected to the outside is provided below the mixing cylinder (311). The inner wall of the sedimentation tank (2) is annular in structure. The lower part of the inner wall of the sedimentation tank (2) is arranged in a funnel-shaped structure. A slag outlet (4) is provided at the center of the lower end of the sedimentation tank (2). A slag removal mechanism is provided, the slag removal mechanism comprising a mounting sleeve (511), a spiral shaft (512), an outer tube (513) and a cleaning strip (514); the inner wall of the slag outlet (4) is provided with a fixed tube (515) through the mounting sleeve (511); the spiral shaft (512) is rotatably arranged on the inner wall of the fixed tube (515) and the upper end is driven to rotate by a waterproof motor (516); the upper end of the fixed tube (515) is connected to the interior of the sedimentation tank (2); the outer tube (513) is sleeved on the outer wall of the fixed tube (515); the side wall of the fixed tube (515) is provided with a drainage hole (517) connected to the outer tube (513); the pitch of the spiral shaft (512) gradually decreases from top to bottom; the lower end of the fixed tube (515) is provided with a slag discharge tube (518); and the cleaning strip (514) is rotatably arranged at the lower part of the interior of the sedimentation tank (2).

2. A papermaking wastewater treatment device according to claim 1, characterized in that: A guide pipe (611) is provided at the upper end of the pretreatment pool (1); the guide pipe (611) is arranged in a replaceable manner; one end of the guide pipe (611) is connected to one end of the water injection pipe (312); a fan blade (612) is provided at the lower part of the guide pipe (611) for sealing and rotation; a plurality of the fan blades (612) are arranged at intervals; the fan blades (612) are arranged at the same height as the inside of the guide pipe (611) and have a matching diameter.

3. A papermaking wastewater treatment device according to claim 2, characterized in that: A plurality of stirring shafts (613) are rotatably provided in the pretreatment tank (1). A fixing frame (614) is provided at the upper end of the pretreatment tank (1). The upper end of the stirring shaft (613) is rotatably provided on the fixing frame (614). The upper end of the fixing frame (614) is assembled and connected with the guide pipe (611) via a support frame (615). The upper end of the stirring shaft (613) is linked with the fan blade (612) via a connecting shaft (616). A water pump (617) is provided outside the pretreatment tank (1). A water outlet at the lower side of the pretreatment tank (1) is connected to the upper end of the interior of the sedimentation tank (2) via the water pump (617).

4. A papermaking wastewater treatment device according to claim 3, characterized in that: The material pipe (313) is arranged in an annular shape at the upper middle portion of the inner wall of the mixing barrel (311); a plurality of nozzles (7) are connected to the material pipe (313); the output end of the nozzle (7) is inclined toward the center of the lower end of the mixing barrel (311); a plurality of water distribution pipes (314) are provided and are arranged in an annular shape; the lower end of the water distribution pipe (314) is located directly above the output end of the nozzle (7).

5. A papermaking wastewater treatment device according to claim 4, characterized in that: The conical tube (315) is arranged in a structure that is narrow at the top and wide at the bottom. The lower end of the conical tube (315) is assembled and connected to the center position of the lower end of the mixing cylinder (311), and the upper end of the conical tube (315) extends to the upper middle of the mixing cylinder (311).

6. A papermaking wastewater treatment device according to claim 1, characterized in that: The spiral shaft (512) comprises a front shaft (811), a middle shaft (812) and a rear shaft (813), the pitches of the front shaft (811), the middle shaft (812) and the rear shaft (813) decreasing in sequence, and a sealing strip is provided at the edge of the spiral shaft (512) and is slidably arranged with the inner wall of the fixed tube (515).

7. A papermaking wastewater treatment device according to claim 1, characterized in that: The installation sleeve (511) is a hollow structure and a rotating ring (911) is provided on the upper part of the interior for sealing and rotation. A plurality of slots (912) are provided on the rotating ring (911). An insert shaft (913) is provided in the slot (912) for sealing and rotation. A connecting ring (914) is rotatably provided at the outer ring of the upper end of the installation sleeve (511). The end faces of the plurality of cleaning strips (514) are assembled and connected to the connecting ring (914). A slot (915) and a limit block (916) are provided above the connecting ring (914) and at the upper edge of the spiral shaft (512). A notch is formed between two adjacent limit blocks (916). A limit plate (917) is provided at the upper end of the insert shaft (913). Blocks (918) that are engaged with the slot (915) and the notch are provided below the two ends of the limit plate (917).

8. A papermaking wastewater treatment device according to claim 7, characterized in that: The lower end of the plug shaft (913) passes through the bottom of the rotating ring (911) and is assembled and connected through the fixed ring (101). A fixed support (103) is provided below the fixed ring (101) through a cylinder (102). The fixed support (103) is assembled and connected to the lower end of the sedimentation tank (2). The lower end of the plug shaft (913) is rotatably connected to the fixed ring (101) and adjacent plug shafts (913) are linked by belts (104). The upper end of the cylinder (102) is slidably connected to the bottom of the fixed ring (101). The lower end of one of the plug shafts (913) is driven to rotate by a first motor (105).

9. A papermaking wastewater treatment device according to claim 8, characterized in that: A waterproof cover (11) is provided at the center of the sedimentation tank (2), the upper end of the waterproof cover (11) is arranged in a conical structure, the waterproof motor (516) is arranged in the waterproof cover (11), and the upper end of the spiral shaft (512) is assembled and connected to the output end of the waterproof motor (516) via a linkage shaft (12).

10. A method for using a papermaking wastewater treatment device, characterized in that: A papermaking wastewater treatment device according to any one of claims 1 to 9 comprises the following steps: Step S1, connecting the sewage to the water injection pipe (312) and injecting it into the mixing drum (311) through the water distribution pipe (314), introducing the pre-prepared flocculant into the mixing drum (311) through the material pipe (313) and spraying it evenly, the sewage discharged through the water distribution pipe (314) and the flocculant are evenly contacted and mixed, and then discharged from the conical pipe (315) into the pretreatment tank (1); Step S2, the sewage that has been preliminarily mixed with the flocculant enters the pretreatment tank (1), the flow of the sewage in the guide pipe (611) drives the fan blade (612) to rotate, and then drives the stirring shaft (613) to rotate, so that the sewage and the flocculant in the pretreatment tank (1) are fully mixed; Step S3, the sewage in the pretreatment tank (1) is introduced into the sedimentation tank (2) by a water pump (617). After a period of sedimentation, the fibers or other fine sediments in the sewage are deposited at the bottom of the sedimentation tank (2); Step S4, during the sedimentation process, the waterproof motor (516) is driven to drive the spiral shaft (512) to rotate slowly. During the slow rotation process, the sediment and sewage are slowly drawn into the interior of the fixed pipe (515), and are squeezed through the front shaft (811), the middle shaft (812) and the rear shaft (813) in sequence. The squeezed water is discharged from the drain hole (517) into the outer pipe (513) and flows into the next sewage treatment stage. Before the spiral shaft (512) starts to rotate, the slag discharge pipe (518) is blocked, and the spiral shaft (512) is started to rotate. When the sediment enters the rear shaft (813) and accumulates, the slag discharge pipe (518) is opened to discharge the slag; Step S5, cleaning the inner wall of the sedimentation tank (2), by lifting the plug shaft (913) into the sedimentation tank (2) for a certain distance so that the limit plate (917) is higher than the connecting ring (914) and the limit block (916), rotating the plug shaft (913) so that the two ends of the limit plate (917) are respectively located above the connecting ring (914) and the limit block (916), pulling down the plug shaft (913) so that the block (918) is engaged with the slot (915) and the notch to limit the position, rotating the spiral shaft (512) to drive the plug shaft (913) and the rotating ring (911) to rotate, and the plug shaft (913) drives the connecting ring (914) and the cleaning strip (514) to rotate to clean the bottom of the tank.

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