A carton printing wastewater integrated purification and reuse equipment

Abstract

The application provides a carton printing wastewater integrated purification and recycling equipment, and belongs to the technical field of printing wastewater treatment. The device comprises a frame, a reaction bucket, a stirring mechanism, an adjusting mechanism, a foam discharge mechanism and a mixing mechanism. The reaction bucket is arranged on the frame and is used for containing carton printing wastewater and a reaction reagent. The stirring mechanism is arranged on the reaction bucket and comprises a rotating shaft and two symmetrically arranged paddles. The rotating shaft drives the two paddles to rotate, and the wastewater and the reaction reagent in the reaction bucket are stirred and mixed. The adjusting mechanism is fixed on the rotating shaft and is in transmission connection with the paddles. The adjusting mechanism comprises two symmetrically arranged swing blocks, and the swing blocks can be tilted to adapt to the rotating speed of the rotating shaft. The device realizes dynamic self-adaptive switching of the paddle angle and the flow field shear force through the rotating speed linkage adjusting mechanism, and respectively adapts to the differentiated requirements of acid separation high-shear demulsification, coagulation medium shear mixing and flocculation low-shear alunite flower growth.

Description

Technical Field

[0001] This application relates to the field of printing wastewater treatment technology, and more specifically, to an integrated purification and reuse device for cardboard box printing wastewater. Background Technology

[0002] Water-based printing inks are now widely used in the cardboard packaging industry. The wastewater from their cleaning process is rich in acrylic resin, organic pigments, wax emulsions, and various additives. This wastewater exhibits strong colloidal stability and a high concentration of organic matter, making it a typical example of recalcitrant organic wastewater. Currently, the mainstream treatment process in the industry is a sequential batch process of acid washing to break down the colloidal structure of the resin emulsion, causing the suspended resin to destabilize and precipitate. Then, coagulants and flocculants are added sequentially to promote the aggregation and flocculation of the precipitated resin and pigment particles, achieving efficient solid-liquid separation.

[0003] The three core processing stages of this process have different and contradictory requirements for the hydraulic flow field of the agitation and the shear strength of the impeller: the acid precipitation and demulsification stage requires high shear and strong turbulence, relying on the radial high shear flow field formed by the 90° straight impeller to achieve rapid and full-area dispersion of acid and efficiently break the stable structure of the emulsion; the coagulation and decolorization stage requires a medium shear shaft diameter composite flow field, adapted to a 45° inclined impeller structure, to ensure rapid mixing of the reagent while protecting the nascent micro-flocs from shear breakage; the flocculation stage requires a low shear, large circulation axial mild flow field, using an inclined impeller at a 45° angle opposite to that of the coagulation stage to ensure stable collision and aggregation of micro-flocs, forming large-particle flocs with a dense structure, effectively avoiding floc breakage and loosening.

[0004] Existing traditional treatment equipment all employ a fixed single-blade structure, with no adjustable hydraulic flow field throughout the process, resulting in a structural and technical contradiction: while a straight blade can meet the requirements for acid precipitation and demulsification, the continuous high shear force will break down subsequent flocculants, leading to excessive suspended solids in the effluent; a small-angle inclined blade can adapt to flocculation temperature and operating conditions, but the mixing efficiency during the acid precipitation stage is low, demulsification is incomplete, and reagent consumption increases significantly. This technical defect is the core reason for the serious reagent waste, large fluctuations in effluent quality, and long-term retention of scum on the liquid surface in traditional equipment.

[0005] Meanwhile, during the acid precipitation reaction, the destabilized and hydrophobic acrylic resin precipitates out, easily carrying microbubbles, wax, and additive residues, forming highly viscous resin scum on the liquid surface. Traditional equipment lacks an immediate scum removal structure, and the scum enters subsequent treatment stages with the water, causing multiple process drawbacks: First, the viscous resin impurities consume additional coagulants, significantly increasing operating costs; second, the viscous scum continuously adheres to the impeller, shaft, and tank wall, forming stubborn scale, disrupting the dynamic balance of stirring, and reducing mass transfer efficiency; third, the scum interferes with the flocculation reaction, generating loose, difficult-to-settle abnormal flocs, causing excessive suspended solids in the effluent, and the viscous resin easily clogs the downstream ultrafiltration membrane, seriously affecting the stable operation of the wastewater reuse system.

[0006] Therefore, there is an urgent need for an integrated purification and reuse equipment for cardboard box printing wastewater that can adaptively adjust the blade angle and remove floating scum in real time. Summary of the Invention

[0007] This application aims to address at least one of the technical problems existing in the prior art or related technologies.

[0008] Therefore, this application provides an integrated purification and reuse equipment for wastewater from cardboard box printing. Through a speed linkage adjustment mechanism, it can achieve dynamic adaptive switching of blade angle and flow field shear force to adapt to the differentiated needs of acid precipitation high-shear demulsification, coagulation medium-shear mixing, and flocculation low-shear alum cultivation.

[0009] This application provides an integrated purification and reuse device for wastewater from cardboard box printing, comprising a frame, a reaction tank, a stirring mechanism, an adjusting mechanism, a foam removal mechanism, and a mixing mechanism. The reaction tank, mounted on the frame, contains cardboard box printing wastewater and reaction reagents. The stirring mechanism, mounted on the reaction tank, includes a rotating shaft and two symmetrically arranged blades. The rotating shaft drives the two blades to rotate, mixing the wastewater and reaction reagents within the reaction tank. The adjusting mechanism, fixed to the rotating shaft and drivenly connected to the blades, includes two symmetrically arranged swing blocks. The swing blocks tilt to adapt to the rotational speed of the rotating shaft, and the tilting motion of the swing blocks is transmitted to the corresponding blades. To achieve the adjustment of the blade angle, the liquid level in the reaction tank is level with the height of the swing block in stages, and the swing block can push and sweep away the scum on the liquid surface while rotating; a defoaming mechanism is set on the frame and connected to the side wall of the reaction tank, and the inlet end of the defoaming mechanism is level with the height of the swing block in stages, which can receive the scum pushed and swept by the swing block; a mixing mechanism is set at the outlet end of the defoaming mechanism and located at the outlet end of the reaction tank, so that the liquid in the reaction tank can open the liquid discharge channel of the defoaming mechanism to complete homogeneous mixing.

[0010] In some embodiments, the system further includes: a buffer tank, disposed on the frame and connected to the reaction tank via a connecting pipe; a sludge discharge valve, disposed on a drain pipe at the bottom of the reaction tank; a clear liquid pipe, disposed on one side of the reaction tank; a defoaming trough, formed on the side wall of the reaction tank, and the defoaming mechanism disposed at the defoaming trough; multiple reagent addition components, disposed on the frame and connected to the inside of the reaction tank; a screw press, disposed on the frame and connected to the drain pipe at the bottom of the reaction tank; and a clear liquid tank, disposed on the frame and located at the output end of the clear liquid pipe.

[0011] In some embodiments, the stirring mechanism further includes: a crossbeam disposed on the reaction vessel; a motor disposed on the crossbeam, the rotating shaft being connected to the output shaft of the motor; a base frame disposed on the inner bottom wall of the reaction vessel and rotatably sleeved on the outside of the rotating shaft; a slide cylinder slidably sleeved on the rotating shaft, with two blades symmetrically distributed on both sides of the slide cylinder; and a sealing sleeve disposed between the blade rotation shaft and the slide cylinder.

[0012] In some embodiments, the adjusting mechanism further includes: a fixed sleeve fitted onto the rotating shaft; two arc-shaped arms symmetrically arranged on both sides of the fixed sleeve, each arc-shaped arm being rotatably connected to the fixed sleeve, and the swing block being correspondingly arranged at the end of the arc-shaped arm away from the fixed sleeve; two connecting rods, each connecting rod having one end hinged to the corresponding arc-shaped arm and the other end hinged to the slide cylinder; a fixed frame fitted onto the rotating shaft and located within the sealed cavity of the slide cylinder; two V-shaped grooves symmetrically opened on both sides of the fixed frame; two swing members, each swing member having one end slidably fitted into the corresponding V-shaped groove and the other end connected to the corresponding blade rotating shaft; and two mud scraper sleeves respectively disposed at both ends of the slide cylinder and fitting against the outer wall of the rotating shaft.

[0013] In some embodiments, the defoaming mechanism includes: a fixed base, fixedly disposed on the side of the reaction tank near the defoaming trough; an electric push rod disposed on the fixed base; a baffle disposed at the output end of the electric push rod, the baffle being larger than the size of the defoaming trough; a collection trough disposed on the outer wall of the reaction tank and covering the outside of the defoaming trough; a defoaming pipe connected to the collection trough; and a defoaming storage tank disposed at the other end of the defoaming pipe.

[0014] In some embodiments, the mixing mechanism includes: a connecting cover, one end of which is connected to the foam storage tank and the other end of which is connected to the drain pipe of the reaction tank; a trough column, which is rotatably disposed at one end of the connecting cover near the drain pipe of the reaction tank, and the trough column is provided with a plurality of flow guiding grooves; and two toothed discs, which are symmetrically disposed on both sides of the trough column.

[0015] In some embodiments, the motor is configured with three speed settings to switch the working state of the blades on the rotating shaft, sequentially matching the three stirring conditions of acid precipitation stage, coagulation stage, and flocculation stage.

[0016] In some embodiments, the shaft is defined to rotate in a constant counterclockwise unidirectional direction.

[0017] Compared with the prior art, the technical solution provided in this application includes at least the following technical effects: This application provides an integrated purification and reuse equipment for wastewater from cardboard box printing. Through a speed-linked adjustment mechanism, it achieves dynamic adaptive switching of blade angle and flow field shear force, adapting to the differentiated needs of acid precipitation high-shear demulsification, coagulation medium-shear mixing of chemicals, and flocculation low-shear floc cultivation. This solves the technical problems of incomplete demulsification or floc breakage in traditional equipment, significantly improving reaction efficiency and effluent stability. At the same time, relying on the phased flush structure of the oscillating block with the liquid surface and the foam removal mechanism, it scrapes and removes scum in real time during the critical stage of acid precipitation scum formation, avoiding the mixing of sticky resin scum into subsequent coagulation and flocculation processes. This effectively solves the problems of high chemical consumption, agitation wall scaling, and membrane module fouling caused by scum residue in traditional processes, reducing operation and maintenance costs and the probability of equipment failure.

[0018] Additional aspects and advantages of this application will become apparent in the following description or may be learned by practice of this application. Attached Figure Description

[0019] The above and / or additional aspects and advantages of this application will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which: Figure 1 This is one of the overall structural schematic diagrams of the device according to some embodiments of this application; Figure 2 This is a second schematic diagram of the overall structure of the device according to some embodiments of this application; Figure 3 This is a schematic diagram of the framework and reaction vessel structure of some embodiments of this application; Figure 4 This is a schematic diagram of the structure of the reaction tank and stirring mechanism in some embodiments of this application; Figure 5 This is a schematic diagram of the stirring mechanism and adjusting mechanism in some embodiments of this application; Figure 6 This is a schematic diagram of the internal cross-sectional structure of the adjustment mechanism in some embodiments of this application; Figure 7 This is a schematic diagram of the regulating mechanism in the acid precipitation stage according to some embodiments of this application; Figure 8 This is a schematic diagram of the adjustment mechanism in the coagulation stage according to some embodiments of this application; Figure 9 This is a schematic diagram of the regulating mechanism in the flocculation stage according to some embodiments of this application; Figure 10 This is a schematic diagram of the structure of the defoaming mechanism and the mixing mechanism in some embodiments of this application; Figure 11 This is a schematic diagram of the structure of a hybrid mechanism according to some embodiments of this application.

[0020] in, Figures 1 to 11 The correspondence between the reference numerals and component names in the attached drawings is as follows: 110. Frame; 120. Buffer tank; 130. Reaction tank; 131. Mud discharge valve; 132. Clarified liquid pipe; 133. Foam removal tank; 140. Reagent addition assembly; 150. Screw press; 160. Clarified liquid tank; 200. Stirring mechanism; 210. Cross frame; 220. Motor; 230. Rotating shaft; 240. Base frame; 250. Slide drum; 260. Paddle blades; 270. Sealing sleeve; 300. Adjustment mechanism; 310. Fixed sleeve; 320. Arc arm; 330. Swing block; 340. Connecting rod; 350. Fixed frame; 351. V-groove; 360. Swing component; 370. Sludge scraper sleeve; 400. Desiccation mechanism; 410. Fixed base; 420. Electric push rod; 430. Baffle; 440. Collection tank; 450. Desiccation pipe; 460. Desiccation storage tank; 500, Mixing mechanism; 510, Connecting cover; 520, Groove column; 530, Gear disc. Detailed Implementation

[0021] To better understand the above-mentioned objectives, features, and advantages of this application, the application will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other.

[0022] Many specific details are set forth in the following description in order to provide a full understanding of this application. However, this application may also be implemented in other ways different from those described herein. Therefore, the scope of protection of this application is not limited to the specific embodiments disclosed below.

[0023] The following reference Figures 1 to 11 This application describes an integrated purification and reuse device for wastewater from cardboard box printing, provided according to some embodiments.

[0024] like Figures 1 to 11As shown, the integrated purification and reuse equipment for cardboard printing wastewater provided according to some embodiments of this application includes a frame 110, a reaction tank 130, a stirring mechanism 200, an adjusting mechanism 300, a defoaming mechanism 400, and a mixing mechanism 500. The reaction tank 130, mounted on the frame 110, is used to contain cardboard printing wastewater and reaction reagents. The stirring mechanism 200, mounted on the reaction tank 130, includes a rotating shaft 230 and two symmetrically arranged blades 260. The rotating shaft 230 drives the two blades 260 to rotate, stirring and mixing the wastewater and reaction reagents in the reaction tank 130. The adjusting mechanism 300, fixed to the rotating shaft 230 and connected to the blades 260, includes two symmetrically arranged swing blocks 330. The swing blocks 330 can tilt to adapt to the rotational speed of the rotating shaft 230, and the tilting action of the swing blocks 330 is transmitted to the adjusting mechanism 500. The blade 260 is used to adjust the angle of the blade 260. The liquid level in the reaction tank 130 is level with the height of the swing block 330 in stages. The swing block 330 can push and sweep the scum on the liquid surface while rotating. The defoaming mechanism 400 is set on the frame 110 and connected to the side wall of the reaction tank 130. The height of the inlet end of the defoaming mechanism 400 is level with the height of the swing block 330 in stages. It can receive the scum pushed and swept by the swing block 330. The mixing mechanism 500 is set at the outlet end of the defoaming mechanism 400 and is located at the outlet end of the reaction tank 130. The liquid in the reaction tank 130 can open the liquid discharge channel of the defoaming mechanism 400 to complete the homogeneous mixing.

[0025] In this embodiment, the wastewater from cardboard printing and the acid precipitation agent are first injected into the reaction tank 130. The shaft 230 of the stirring mechanism 200 rotates at high speed. The high speed causes the swing block 330 of the adjusting mechanism 300 to generate a large centrifugal force, tilting outward significantly. The linkage blade 260 is adjusted to a 90° straight blade state, forming a strong turbulent, high-shear radial flow field, which can quickly complete the full-area dispersion of acid, destroy the stable structure of acrylic resin emulsion, and achieve efficient demulsification. At this stage, the liquid surface is level with the swing block 330. The swing block 330 continuously pushes and sweeps the scum precipitated on the liquid surface as it rotates at high speed. The scum is collected and discharged in real time by the foam removal mechanism 400 to avoid scum lingering in the water. After the acid precipitation demulsification is completed, the speed of the shaft 230 is reduced. The centrifugal force of the swing block 330 decreases, and it tilts downward under the action of gravity. The linkage blade 260 is adjusted to a 45° oblique blade state. The rotation of the blade 260 is in a downward pressing shape, forming a medium-shear flow field with axial and radial composite. At this time, a coagulant is added, and the medium-shear flow field is further enhanced. The shear force combined with the downward pressure of the water flow ensures that the agent and the water are fully mixed, neutralizes the colloidal charge, removes pigments from the water, and does not break the small flocs formed in the early stage. After coagulation and decolorization, the rotating shaft 230 is reduced to a low speed, the swing block 330 tilts downward again, and the linkage blade 260 switches to a 45° tilt angle opposite to the coagulation stage. The blade 260 rotates in an upward lifting shape, forming a low-shear, large-circulation axial flow field. After the addition of polymer flocculant, the lifting water can stably suspend the micro-flocs in the water, allowing the micro-flocs to slowly collide and aggregate into large flocs. After the three-stage reaction is completed, after a period of settling, the water in the reaction tank 130 forms a layered phenomenon with a clear liquid on the top and sediment at the bottom. The clear water on the top of the reaction tank 130 is discharged, while the water containing flocs settles to the bottom and is discharged through the bottom drain pipe. During the flow of this water, it can be mixed with the water in the foam removal mechanism 400 after settling and foam removal through the mixing mechanism 500, and finally enters the subsequent process.

[0026] In some possible embodiments, such as Figures 1 to 4 As shown, it also includes: a buffer tank 120, which is mounted on the frame 110 and connected to the reaction tank 130 via a connecting pipe; a mud discharge valve 131, which is mounted on the drain pipe at the bottom of the reaction tank 130; a clear liquid pipe 132, which is mounted on one side of the reaction tank 130; a foam defoaming trough 133, which is opened on the side wall of the reaction tank 130, and a foam defoaming mechanism 400 is mounted at the foam defoaming trough 133; multiple reagent addition components 140, which are mounted on the frame 110 and connected to the inside of the reaction tank 130; a screw press 150, which is mounted on the frame 110 and connected to the drain pipe at the bottom of the reaction tank 130; and a clear liquid tank 160, which is mounted on the frame 110 and located at the output end of the clear liquid pipe 132.

[0027] In this embodiment, the wastewater to be treated is first stored in a buffer tank 120 to achieve homogenization and adjustment of water quality and quantity, and then smoothly fed into the reaction tank 130. Multiple sets of reagent addition components 140 precisely add corresponding reagents in stages according to the sequence of acid precipitation, coagulation, and flocculation, and work with the stirring mechanism 200 and the regulating mechanism 300 to complete the pitch change reaction. The viscous scum precipitated during the acid precipitation stage is discharged in time through the foam discharge trough 133 on the side wall of the reaction tank 130 in conjunction with the foam discharge mechanism 400 to avoid scum accumulation and water pollution. After the entire batch reaction is completed, after a period of time... During the static settling process, the water in the reaction tank 130 forms a stratified phenomenon with a clear liquid on top and sediment at the bottom. The clear water on top is introduced into the clear liquid tank 160 for storage through the clear liquid pipe 132 on the side wall for recycling in the workshop. The mixed water at the bottom, containing dense flocs and sedimented sludge, is discharged by opening the sludge discharge valve 131 and sent to the screw press 150. The screw press 150 squeezes and dewaters the sludge flocs, solidifies the ink residue and transports it off-site, and the dewatered filtrate is returned to the buffer tank 120 for further treatment. The entire process realizes a closed-loop recycling treatment of wastewater, sludge and filtrate.

[0028] In some possible embodiments, such as Figure 4 , Figure 5 As shown, the stirring mechanism 200 also includes: a cross frame 210, which is mounted on the reaction tank 130; a motor 220, which is mounted on the cross frame 210, and a rotating shaft 230 connected to the output shaft of the motor 220; a base frame 240, which is mounted on the inner bottom wall of the reaction tank 130 and rotatably sleeved on the outside of the rotating shaft 230; a slide cylinder 250, which is slidably sleeved on the rotating shaft 230, and two blades 260 are symmetrically distributed on both sides of the slide cylinder 250; and a sealing sleeve 270, which is mounted between the rotating shaft of the blades 260 and the slide cylinder 250.

[0029] In this embodiment, when the device is running, the motor 220 outputs power through the crossbeam 210 to drive the rotating shaft 230 to rotate. The rotating shaft 230 is connected to the top motor 220 and limited by the bottom base frame 240 to maintain vertical and stable rotation, and drives the slide cylinder 250 and the two side blades 260 to rotate synchronously. The motor 220 is set to three rotation speeds to adapt to the three angle rotations of the blades 260.

[0030] In some possible embodiments, such as Figures 5 to 9As shown, the adjustment mechanism 300 further includes: a fixed sleeve 310, sleeved on the rotating shaft 230; two arc-shaped arms 320, symmetrically arranged on both sides of the fixed sleeve 310, each arc-shaped arm 320 being rotatably connected to the fixed sleeve 310, and a swing block 330 correspondingly arranged at the end of the arc-shaped arm 320 away from the fixed sleeve 310; two connecting rods 340, each connecting rod 340 having one end hinged to the corresponding arc-shaped arm 320 and the other end hinged to the slide cylinder 250; a fixed frame 350, sleeved on the rotating shaft 230 and located in the sealed cavity of the slide cylinder 250; two V-shaped grooves 351, symmetrically opened on both sides of the fixed frame 350; two swinging members 360, each swinging member 360 having one end slidably fitted in the corresponding V-shaped groove 351 and the other end connected to the rotating shaft of the corresponding blade 260; and two mud scraper sleeves 370, respectively arranged at both ends of the slide cylinder 250 and fitting against the outer wall of the rotating shaft 230.

[0031] In this embodiment, during the acid precipitation stage, the rotating shaft 230 rotates at high speed, and the swing block 330, under the action of a large centrifugal force, drives the arc arm 320 to swing outward significantly. The arc arm 320 pulls the connecting rod 340 to pull the slide cylinder 250 upward. The slide cylinder 250 moves upward along the rotating shaft 230, causing the inner swing member 360 to slide upward along the V-groove 351. Under the guiding and limiting effect of the V-groove 351, the double-sided blades 260 are opened to a horizontal 90° vertical state (e.g., Figure 7 As shown), a turbulent high-shear radial flow field is formed, which meets the process requirements of rapid demulsification and dispersion of the reagent in acid precipitation. At the same time, the swing block 330 drives the arc arm 320 to rotate and sweep the liquid surface, sweeping away the scum. After the acid precipitation is completed, the speed is reduced, the centrifugal force of the swing block 330 decreases, and under the action of gravity, it drives the arc arm 320 to swing downward. The connecting rod 340 pushes the slide cylinder 250 to move slightly downward, and the swing component 360 slides along the V-groove 351 until the blade 260 switches to a positive 45° downward tilting state (as shown). Figure 8 As shown), a composite medium shear flow field is formed around the shaft diameter. The downward-pressurized water flow ensures thorough mixing of the reagents and neutralization of colloidal charges, while protecting the nascent micro-flocs from shear breakage, making it suitable for coagulation and decolorization conditions. After coagulation, the centrifugal force of the swing block 330 decreases again, the arc-shaped arm 320 tilts downward, the connecting rod 340 further pushes the slide cylinder 250 downward, and the swing component 360 slides along the V-groove 351 to the bottom and reverses direction, causing the blade 260 to flip and switch to a reverse 45° upward tilting lifting state opposite to the coagulation stage (as shown). Figure 9 As shown in the figure, a low-shear, large-circulation axial flow field is formed, and the water lifts the micro flocs to collide and aggregate, forming large-particle flocs; during the sliding process of the slide cylinder 250, the upper and lower scraper sleeves 370 slide synchronously to scrape off the material adhering to the rotating shaft 230 in real time, ensuring that the slide cylinder 250 slides without jamming.

[0032] In some possible embodiments, such as Figure 10As shown, the defoaming mechanism 400 includes: a fixed base 410, which is fixedly installed on the side of the reaction tank 130 near the defoaming trough 133; an electric push rod 420, which is installed on the fixed base 410; a baffle 430, which is installed at the output end of the electric push rod 420, and the size of the baffle 430 is larger than the size of the defoaming trough 133; a collection tank 440, which is installed on the outer wall of the reaction tank 130 and covers the outside of the defoaming trough 133; a defoaming pipe 450, which is connected to the collection tank 440; and a defoaming storage tank 460, which is installed at the other end of the defoaming pipe 450.

[0033] In this embodiment, during the acid precipitation stage, the liquid level of the equipment is level with the swing block 330 and the foam discharge tank 133. The electric push rod 420 retracts, causing the baffle 430 to rise and open the foam discharge tank 133. The arc arm 320 rotates and sweeps the liquid surface to collect highly viscous resin scum. The scum is pushed into the collection tank 440 through the foam discharge tank 133 and enters the foam storage tank 460. The foam storage tank 460 treats the scum wastewater by settling, which can gradually eliminate some of the air bubbles carried by the water until the acid precipitation and scum discharge are completed. The electric push rod 420 extends and pushes the baffle 430 down to seal the foam discharge tank 133, ensuring that the internal cavity of the reaction tank 130 is sealed. The water in the foam storage tank 460 that has been settled and defoamed can be incorporated into the mixing mechanism 500 during the water discharge stage of the reaction tank 130 and homogenized with the upper clear water and the bottom water containing floc in the reaction tank 130.

[0034] In some possible embodiments, such as Figure 10 , Figure 11 As shown, the mixing mechanism 500 includes: a connecting cover 510, one end of which is connected to the foam storage tank 460 and the other end of which is connected to the drain pipe of the reaction tank 130; a trough column 520, which is rotatably disposed at one end of the connecting cover 510 near the drain pipe of the reaction tank 130, and a plurality of flow guiding grooves are provided on the trough column 520; and two toothed discs 530, which are symmetrically disposed on both sides of the trough column 520.

[0035] In this embodiment, after the acid precipitation, coagulation, and flocculation reactions are completed, the lower layer of floc-containing water in the reaction tank 130 is discharged at high speed through the bottom drain pipe and flows into the connecting cover 510. The high-speed water flow directly impacts the toothed disc 530 structure on both sides of the tank column 520, using the impact force of the water flow to drive the toothed disc 530 to rotate, thereby causing the entire tank column 520 to rotate synchronously. At the same time, the scum water inside the floc storage tank 460 is introduced into the tank column 520 area through the connecting cover 510. During the rotation of the tank column 520, the scum water... The scum water introduced by the foam tank 460 continuously enters the multiple guide grooves on the surface of the column 520. As the grooves rotate at high speed, they are sheared and diverted. The guide grooves can mechanically disperse and refine the residual fine sticky scum and loose foam clumps, eliminating the phenomenon of scum agglomeration. At the same time, the dispersed scum water and the alum floc-containing water discharged from the reaction tank 130 are fully convected, mixed and homogenized inside the connecting cover 510, realizing the deep mixing of the two water bodies and avoiding the blockage of the screw press 150 caused by the separate treatment of the highly viscous scum.

[0036] Furthermore, the motor 220 sets three speed levels to switch the working state of the impeller 260 via the rotating shaft 230, sequentially matching the three stirring conditions of the acid precipitation stage, coagulation stage, and flocculation stage.

[0037] In some possible embodiments, the rotating shaft 230 is defined to rotate in a constant counterclockwise unidirectional direction.

[0038] In this embodiment, the linkage transmission structure composed of the arc arm 320, connecting rod 340, slide 250, and swinging component 360 is only adapted to the centrifugal force distribution generated by counterclockwise rotation. The rotating shaft 230 is fixed to rotate counterclockwise. The force direction of the outward tilt of the swing block 330, the swing trajectory of the arc arm 320, and the displacement stroke of the connecting rod 340 pulling the slide 250 are all within the design standard range. It can stably realize the switching of three attitudes: 90° flat propeller, 45° downward propeller, and 45° upward propeller in the opposite direction. Bidirectional rotation will change the lateral component of the centrifugal force, causing the pitch change to jam and the blade 260 tilt angle to be not adjusted properly, thus disrupting the three-stage stirring flow field.

[0039] When this integrated wastewater purification and reuse equipment for cardboard box printing is in operation, the wastewater first flows into the buffer tank 120, where the water quality and quantity are homogenized and regulated. It then flows into the reaction tank 130, where the motor 220 drives the rotating shaft 230 to rotate counter-clockwise. Three preset speeds are matched to the three-stage treatment process. During the acid precipitation stage, the motor 220 operates at high speed, and the swing block 330, under the action of large centrifugal force, drives the arc-shaped arm 320 to swing. The connecting rod 340 pulls the slide cylinder 250 upwards, and the V-groove 351 guides the blade 260 to a 90° straight position, forming a high shear diameter. The acid is rapidly dispersed in the flow field, disrupting the emulsion structure and achieving efficient demulsification. During this stage, the oscillating block 330 is level with the liquid surface and the foam removal tank 133. The oscillating block 330 and the arc-shaped arm 320 rotate with the rotating shaft 230 to push and sweep the scum on the liquid surface. The baffle 430 of the foam removal mechanism 400 opens, and the scum flows into the foam storage tank 460 through the collection tank 440 and the foam removal pipe 450. After acid precipitation is completed, the motor 220 switches to the medium speed gear, the centrifugal force of the oscillating block 330 decreases and gravity causes it to drop, driving the slide 250 to move downward. The blade 260 switches to a positive 45° downward pressing posture, and the coagulant is added in conjunction with the reagent addition component 140. The downward-pressurized water flow can quickly mix the agents, neutralize the colloidal charge, and remove pigments from the water. Simultaneously, the moderate shear force protects the nascent micro-flocs from breakage, ensuring stable coagulation and decolorization. After coagulation, the motor 220 operates at low speed, the oscillating block 330 deflects downwards, the slide cylinder 250 moves further downwards, and the oscillating component 360 slides along the V-groove 351 in a reverse direction, causing the blade 260 to switch to a 45° upward-supporting posture, forming a low-shear, large-circulation flow field. After the addition of the polymer flocculant, the water flow is lifted to stably suspend the micro-flocs, promoting their slow collision and aggregation to form dense, easily settling large-particle flocs. The slide cylinder 250 moves... During the process, the sludge scraper sleeves 370 at both ends of the sliding cylinder 250 scrape off the dirt on the rotating shaft 230 in real time as it slides. After the three-stage reaction is completed, after a period of settling, the water in the reaction tank 130 forms a layered phenomenon with an upper layer of clear liquid and a bottom layer of sediment. The upper layer of clear water flows into the clear liquid tank 160 through the clear liquid pipe 132, while the water containing alum floc sludge at the bottom is discharged through the sludge discharge valve 131 and the drain pipe. The high-flow-rate drain impacts the toothed disc 530 of the mixing mechanism 500, driving the column 520 to rotate. The scum water in the foam storage tank 460 flows into the connecting cover 510 simultaneously, and is sheared and dispersed by the guide groove of the column 520, so that the two water bodies are fully mixed synchronously.

[0040] In this application, it should be noted that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0041] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0042] In this application, unless otherwise expressly specified and limited, the terms "installation" and "connection" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. The term "multiple" refers to two or more, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0043] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0044] In this application, the terms "one embodiment," "some embodiments," "specific embodiment," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0045] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. An integrated purification and reuse equipment for wastewater from cardboard box printing, characterized in that, include: frame; A reaction vessel, mounted on the frame, is used to contain wastewater from cardboard printing and reaction reagents; A stirring mechanism is provided on the reaction tank. The stirring mechanism includes a rotating shaft and two symmetrically arranged blades. The rotating shaft drives the two blades to rotate, thereby stirring and mixing the wastewater and reaction reagents in the reaction tank. An adjustment mechanism is fixed on the rotating shaft and connected to the blade drive. The adjustment mechanism includes two symmetrically arranged swing blocks. The swing blocks can tilt to adapt to the rotation speed of the rotating shaft. The tilting action of the swing blocks is transmitted to the corresponding blade to realize the blade angle adjustment. The liquid level in the reaction tank is level with the height of the swing blocks in stages. The swing blocks can push and sweep the scum on the liquid surface while rotating. A defoaming mechanism is installed on the frame and connected to the side wall of the reaction tank. The height of the inlet end of the defoaming mechanism is level with the height of the swing block in stages, and it can receive the liquid surface scum pushed and swept by the swing block. A mixing mechanism is provided at the outlet end of the defoaming mechanism and located at the outlet end of the reaction tank. The liquid in the reaction tank can open the liquid discharge channel of the defoaming mechanism to complete homogeneous mixing.

2. The integrated purification and reuse equipment for cardboard box printing wastewater according to claim 1, characterized in that, Also includes: A buffer tank is mounted on the frame and connected to the reaction vessel via a connecting pipe. A mud discharge valve is installed on the drain pipe at the bottom of the reaction tank; A clear liquid pipe is located on one side of the reaction vessel; A defoaming trough is provided on the side wall of the reaction tank, and the defoaming mechanism is provided at the defoaming trough; Multiple reagent addition components are mounted on the frame and communicate with the interior of the reaction vessel; A screw press is mounted on the frame and connected to the drain pipe at the bottom of the reaction tank; A clear liquid tank is mounted on the frame and located at the output end of the clear liquid pipe.

3. The integrated purification and reuse equipment for cardboard box printing wastewater according to claim 2, characterized in that, The stirring mechanism also includes: A crossbeam is installed on the reaction vessel; A motor is mounted on the crossbeam, and the rotating shaft is connected to the output shaft of the motor; The base frame is installed inside the bottom wall of the reaction vessel and is rotatably sleeved on the outside of the rotating shaft; A sliding cylinder is slidably sleeved on the rotating shaft, and two blades are symmetrically distributed on both sides of the sliding cylinder; A sealing sleeve is disposed between the blade rotation shaft and the slide.

4. The integrated purification and reuse equipment for cardboard box printing wastewater according to claim 3, characterized in that, The adjustment mechanism further includes: A fixing sleeve is fitted onto the rotating shaft; Two arc-shaped arms are symmetrically arranged on both sides of the fixed sleeve. Each arc-shaped arm is rotatably connected to the fixed sleeve. The swing block is correspondingly arranged at the end of the arc-shaped arm away from the fixed sleeve. Two connecting rods, one end of each connecting rod is hinged to the corresponding arc-shaped arm, and the other end is hinged to the slide cylinder; A fixing frame is sleeved on the rotating shaft and located in the sealed cavity of the slide cylinder; Two V-shaped grooves are symmetrically opened on both sides of the fixing frame; Two oscillating components, each of which has one end slidably fitted into the corresponding V-groove and the other end connected to the corresponding blade rotation shaft; Two scraper sleeves are located at both ends of the slide cylinder and are in contact with the outer wall of the rotating shaft.

5. The integrated purification and reuse equipment for cardboard box printing wastewater according to claim 2, characterized in that, The defoaming mechanism includes: A fixed base is fixedly installed on the side of the reaction tank near the defoaming trough; An electric actuator is mounted on the fixed base; A baffle is provided at the output end of the electric push rod, and the size of the baffle is larger than the size of the desiccant. A collection tank is provided on the outer wall of the reaction tank and covers the outside of the defoaming tank; The drooping pipe is connected to the collection tank; A foam storage tank is located at the other end of the foam discharge pipe.

6. The integrated purification and reuse equipment for cardboard box printing wastewater according to claim 5, characterized in that, The hybrid mechanism includes: The connecting cover is connected at one end to the foam storage tank and at the other end to the drain pipe of the reaction tank. The trough column is rotatably mounted at one end of the connecting cover near the drain pipe of the reaction tank, and multiple flow guiding grooves are provided on the trough column; Two toothed discs are symmetrically arranged on both sides of the groove column.

7. The integrated purification and reuse equipment for cardboard box printing wastewater according to claim 1, characterized in that, The motor has three speed settings, which allows the rotating shaft to switch the working state of the blades, sequentially matching the three stirring conditions of acid precipitation stage, coagulation stage, and flocculation stage.

8. The integrated purification and reuse equipment for cardboard box printing wastewater according to claim 7, characterized in that, The rotating shaft is limited to a constant counterclockwise unidirectional rotation.

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