A modular integrated wastewater treatment and recycling system for heavy metal paint spraying

Abstract

This invention relates to the field of multi-stage wastewater treatment technology and discloses a modular integrated heavy metal paint spraying wastewater treatment and circulation system, including a tank. A partition is fixedly installed inside the tank, and the tank's interior sequentially forms a complex-breaking zone, a coagulation and flocculation zone, and an air flotation separation zone along the wastewater flow direction. This modular integrated heavy metal paint spraying wastewater treatment and circulation system effectively solves the problem in existing technologies where the air flotation chamber in paint spraying wastewater treatment has a baffle. A chain-driven scraper needs to push the scum above the baffle for overflow collection. However, existing scrapers follow the sprocket in an arc-shaped rotation path, while the baffles are mostly oblique, straight structures. The arc-shaped movement trajectory of the scraper differs from the oblique surface of the baffle, inevitably creating a gap between the scraper and the baffle. This prevents the scum from being fully pushed above the baffle, leaving some scum trapped in the gap, resulting in incomplete scum removal and affecting the wastewater treatment effect.

Description

Technical Field

[0001] This invention relates to the field of multi-stage wastewater treatment technology, specifically to a modular integrated heavy metal paint spraying wastewater treatment and recycling system. Background Technology

[0002] In the production processes of spray painting and electroplating industries, the wastewater generated usually contains heavy metal ions, organic solvents, and suspended particulate pollutants. For the treatment of such wastewater, the common practice is to first break down the complex structure in the wastewater through a complex-breaking reaction to release heavy metal ions; then add coagulants and flocculants to make the pollutants form flocs; finally, use air flotation technology to make the flocs adhere to tiny air bubbles and float to the liquid surface to form a scum layer, thereby achieving solid-liquid separation.

[0003] In existing technologies, the flotation chamber in paint spraying wastewater treatment is equipped with baffles. A scraper driven by a chain is required to scrape and push the scum above the baffle for overflow collection. However, the existing scraper follows the sprocket in an arc-shaped rotation path, while the baffle is mostly a slanted, straight structure. The arc-shaped movement trajectory of the scraper does not coincide with the slanted surface of the baffle, and there will inevitably be a gap between the scraper and the baffle. The scum cannot be fully scraped and pushed above the baffle, and some scum will be trapped in the gap, resulting in incomplete removal of scum and affecting the wastewater treatment effect. Summary of the Invention

[0004] To address the aforementioned shortcomings of existing technologies, this invention provides a modular integrated heavy metal paint spraying wastewater treatment and recycling system. This system effectively solves the problem in existing technologies where the flotation chamber contains baffles, and a chain-driven scraper pushes scum above the baffles for overflow collection. However, existing scrapers follow a sprocket in an arc-shaped rotation path, while the baffles are mostly oblique, straight structures. The arc-shaped movement trajectory of the scraper does not coincide with the oblique surface of the baffle, inevitably creating a gap between the scraper and the baffle. As a result, scum cannot be fully pushed above the baffle, and some scum becomes trapped in the gaps, leading to incomplete scum removal and affecting wastewater treatment efficiency.

[0005] To achieve the above objectives, the present invention provides the following technical solution: This invention provides a modular integrated wastewater treatment and recycling system for heavy metal paint spraying, comprising: The tank has a partition fixedly installed inside. The tank is formed sequentially along the sewage flow direction into a fibrous breaking zone, a coagulation and flocculation zone, and an air flotation separation zone. The air flotation separation zone is equipped with a sludge scraping structure. The system includes two rotatably connected internal stirring shafts in the breaking-of-network zone and the coagulation-flocculation zone. The slag scraping structure comprises two sprockets, sprocket one and sprocket two, arranged horizontally within the air flotation separation zone. Sprocket two is located on the side of sprocket one furthest from the breaking-of-network zone. Rotating shafts, rotatably connected to the inner wall of the tank, are fixedly mounted on the inner circumference of both sprockets. Chains are meshed with the outer surfaces of both sprockets, and connecting blocks are fixedly connected to the outer surfaces of the chains. Slag scraping plates are mounted on the outer surfaces of the connecting blocks. An upright plate, fixedly connected to the inner wall of the tank, is located inside the air flotation separation zone. An arc-shaped overflow plate is fixedly connected to the top of the upright plate, with the center of curvature of the arc-shaped overflow plate coinciding with the rotation center of sprocket two. When the slag scraping plate moves to the outside of sprocket two, the distance from the rotation center of sprocket two to the outer end of the slag scraping plate is the same as the distance from the rotation center of sprocket two to the surface of the arc-shaped overflow plate.

[0006] Furthermore, the outer surface of the box is provided with an inlet pipe that communicates with the interior of the flocculation breaking zone, and an aeration pipe is provided on the side of the air flotation separation zone near the coagulation and flocculation zone.

[0007] Furthermore, the outer surface of the connecting block adopts a convex arc surface design, and the side of the scraper plate near the chain adopts a concave arc surface design that slides in contact with the convex arc surface of the connecting block.

[0008] Furthermore, a horizontal groove is formed on the inner wall surface of the box, and a peeling strip that slides on the inner wall surface of the horizontal groove is provided inside the breaking zone. A cylinder is provided at the top of the box, and the output end of the cylinder is fixedly connected to the side of the peeling strip.

[0009] Furthermore, the front side of the scraper plate along its direction of movement is the working surface, used to scrape and push floating slag, and the scraper plate is provided with a connecting member through a receiving cavity opened inside it.

[0010] Furthermore, the connecting member includes an abutment rod that slides perpendicularly to the working surface. One end of the abutment rod extends into the interior of the receiving cavity and is hinged to a rotating rod. The end of the rotating rod away from the abutment rod is hinged to a wedge-shaped rod. The outer end of the wedge-shaped rod penetrates the receiving cavity and extends to the outer surface of the concave arc surface of the scraper. A locking block is fixedly connected to the side of the connecting block. An elastic sheet connected to the inner end of the wedge-shaped rod is provided on the inner surface of the receiving cavity.

[0011] Furthermore, a protrusion is fixedly connected to the side of the connecting block, and an arc-shaped rod is fixedly connected to the side of the protrusion away from the locking block. A fixing block that slides on the outer circumference of the arc-shaped rod is fixedly connected to the concave arc surface of the scraper, and a tension spring is sleeved on the outer circumference of the arc-shaped rod.

[0012] Furthermore, the side of the card block near the scraper plate is provided with a wedge-shaped groove that fits with the outer end of the wedge-shaped rod, and the front side of the card block along its direction of movement is the contact surface.

[0013] The technical solution provided by this invention has the following advantages compared with the prior art: 1. In existing technology, the liquid level in the flotation separation zone is determined by the height of the baffle in the collection tank. However, the bottom of the scum layer formed after flocculation is not flush with the liquid surface, but rather below the liquid surface at a certain depth. If the scraper is higher than or flush with the top of the baffle, it cannot reach the scum layer below the liquid surface, resulting in incomplete scum removal. Some scum remains in the flotation zone and flows with the water into subsequent treatment units or effluent, affecting the treatment effect. If the scraper is lower than the baffle, although it can contact the scum layer, the scraper's trajectory will have gaps with the baffle as it rotates around the sprocket with the chain. The scum cannot be fully scraped and pushed above the baffle, resulting in incomplete scum removal and affecting the wastewater treatment effect. This invention achieves thorough and damage-free removal of scum by aligning the center of curvature of the arc-shaped overflow plate with the center of rotation of the second sprocket, and ensuring that the distance from the center of rotation of the second sprocket to the outer end of the scraper plate is equal to the distance from the center of rotation of the second sprocket to the surface of the arc-shaped overflow plate. Because the two are concentric arcs, the distance between the outer end of the scraper plate and the surface of the arc-shaped overflow plate remains constant and zero during the rotation of the scraper plate around the second sprocket. This eliminates both dead angles caused by excessive spacing and mechanical collisions due to trajectory interference, thus achieving thorough and damage-free removal of scum.

[0014] 2. During the slag scraping process, the scraper plate follows the chain angle change via connecting blocks. If the residual slag on its working surface is not removed in time, it will fall back into the air flotation separation zone during the scraper plate's return stroke, causing secondary pollution or even breaking the flocs. This invention uses a cylinder to drive a stripping bar to slide horizontally along a horizontal groove. The lower surface of the stripping bar horizontally scrapes the working surface of the scraper plate, thoroughly removing the residual slag to the outside of the air flotation separation zone. This ensures that the outer surface of the scraper plate will not bring the slag back into the air flotation separation zone during the scraper plate's return stroke, effectively avoiding secondary pollution and improving the stability of the effluent water quality.

[0015] 3. The sprocket needs to rotate continuously to ensure continuous operation of the equipment and avoid frequent shutdowns. Consequently, the scraper plate will always move with the sprocket and cannot remain stationary. If the residual scum on the scraper plate's working surface is not cleaned in time, it will be poured back into the air flotation separation zone when the scraper plate flips back, causing secondary pollution. At the same time, because the scraper plate is constantly moving, the stripping strip cannot always maintain close contact with the working surface during cleaning, and relative displacement is likely to occur, resulting in poor cleaning effect and incomplete removal of residual scum. This invention effectively solves the above-mentioned defects by realizing a sliding connection between the scraper plate and the connecting block: In the initial state, the elastic sheet is in the unfolded state, and the outer end of the wedge rod extends to the outer surface of the concave arc surface of the scraper plate under the push of the elastic sheet. The side of the wedge rod away from the working surface is in contact with the abutting surface of the locking block, realizing the initial limiting of the scraper plate and the connecting block, ensuring that the two can move synchronously to perform scraping operations; When the scraper plate rotates around the sprocket to a horizontal state, the abutting rod is squeezed into the receiving cavity under the reaction of the peeling strip, causing the wedge rod to retract, and the wedge rod disengages from the locking block, releasing the limiting between the scraper plate and the connecting block. At this time, the connecting block continues to move with the rotation of the sprocket, while the scraper plate is limited by the peeling strip and its position is temporarily fixed, ensuring that when the peeling strip scrapes the working surface, the two are always in close contact without relative displacement, which can thoroughly remove the residual scum on the working surface, avoid the scum falling back due to incomplete cleaning, eliminate secondary pollution, and at the same time, it does not affect the continuous rotation of the sprocket and the continuous operation of the equipment, taking into account both cleaning effect and operating efficiency.

[0016] 4. The connecting block and scraper plate of this invention adopt a design that combines convex and concave arc surfaces, ensuring a stable connection between the scraper plate and the connecting block while allowing the scraper plate to slide relative to the connecting block along the arc surface at specific positions. When the scraper plate is at the rightmost position for cleaning, the connecting block continues to rotate a small angle around the sprocket, and the concave arc surface of the scraper plate slides against the convex arc surface of the connecting block, while the tension spring is stretched to store elastic potential energy. After the stripping strip has completely passed the working surface of the scraper plate, the tension spring releases its elastic potential energy, pulling the scraper plate to slide and reset quickly. Under the action of the elastic plate, the wedge rod again contacts the contact surface of the locking block, completing the automatic reset of the scraper plate. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the accompanying drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are merely some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without any creative effort.

[0018] Figure 1 This is a three-dimensional structural diagram of an embodiment of the present invention; Figure 2 This is a structural schematic diagram from another perspective of an embodiment of the present invention; Figure 3 This is a cross-sectional structural diagram of the box body according to an embodiment of the present invention; Figure 4 This is an embodiment of the present invention. Figure 3 A magnified structural diagram of part A in the middle; Figure 5 This is a schematic diagram of the slag scraping structure according to an embodiment of the present invention; Figure 6 This is a schematic diagram of the structure of the peeling strip, horizontal groove, scraper, and connecting block according to an embodiment of the present invention; Figure 7 This is a schematic diagram of the structure of the present invention with the working surface facing vertically to the right in an embodiment; Figure 8 This is a schematic diagram of the structure of the present invention with the working surface facing upwards, according to an embodiment of the invention.

[0019] The labels in the diagram represent: 1. Box body; 10. Inlet pipe; 11. Baffle plate; 12. Horizontal groove; 13. Stripping strip; 131. Cylinder; 2. Breaking zone; 21. Stirring shaft; 3. Coagulation and flocculation zone; 4. Air flotation separation zone; 41. Slag scraping structure; 411. Sprocket one; 412. Sprocket two; 413. Rotating shaft; 414. Chain; 415. Connecting block; 416. Slag scraper; 4161. Working surface; 4162. Receiving cavity; 42. Vertical plate; 43. Arc-shaped overflow plate; 44. Aeration pipe; 45. Connecting piece; 451. Abutment rod; 452. Rotating rod; 453. Wedge rod; 454. Locking block; 4541. Wedge groove; 455. Elastic sheet; 456. Protrusion; 457. Arc-shaped rod; 458. Fixing block; 459. Tension spring. Detailed Implementation

[0020] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0021] The present invention will be further described below with reference to embodiments.

[0022] Example: Please see Figures 1-8 This invention provides a technical solution: a modular integrated wastewater treatment and recycling system for heavy metal paint spraying, comprising: The tank 1 has a partition 11 fixedly installed inside the tank 1. The interior of the tank 1 is divided into a series of sections along the sewage flow direction by the partition 11, forming a fibrous breaking zone 2, a coagulation and flocculation zone 3 and an air flotation separation zone 4. The air flotation separation zone 4 is equipped with a sludge scraping structure 41. Both the breaking zone 2 and the coagulation and flocculation zone 3 are rotatably connected to a stirring shaft 21. A stirring paddle for mixing chemical agents is fixedly connected to the outer circumference of the stirring shaft 21. The slag scraping structure 41 includes a first sprocket 411 and a second sprocket 412 disposed inside the air flotation separation zone 4. Two sprockets 411 and two sprockets 412 are provided, arranged horizontally in sequence. The second sprocket 412 is located on the side of the first sprocket 411 furthest from the breaking zone 2. The inner circumference of both sprockets 411 and sprockets 412 is fixedly fitted with a rotating connection to the inner wall surface of the tank 1. A chain 414 is meshed with the outer surfaces of the rotating shaft 413, sprocket 411, and sprocket 412. Connecting blocks 415 are fixedly connected to the outer surfaces of the chains 414. Several connecting blocks 415 are evenly distributed on the outer surfaces of the chains 414. Scraper plates 416 are slidably connected to the outer surfaces of the connecting blocks 415. Inside the air flotation separation zone 4, a vertical plate 42 is fixedly connected to the inner wall of the tank 1. An arc-shaped overflow plate 43 is fixedly connected to the top of the vertical plate 42. The center of curvature of the arc-shaped overflow plate 43 coincides with the rotation center of sprocket 412. When the scraper plate 416 moves to the outside of sprocket 412, the distance from the rotation center of sprocket 412 to the outer end of the scraper plate 416 is equal to the distance from the rotation center of sprocket 412 to the surface of the arc-shaped overflow plate 43.

[0023] The outer surface of the tank 1 is provided with an inlet pipe 10 that is connected to the interior of the breaking zone 2, and an aeration pipe 44 is provided on the side of the air flotation separation zone 4 near the coagulation and flocculation zone 3.

[0024] The outer surface of the connecting block 415 is designed with a convex arc surface, and the side of the scraper plate 416 near the chain 414 is designed with a concave arc surface that slides in contact with the convex arc surface of the connecting block 415.

[0025] A horizontal groove 12 is provided on the inner wall surface of the box 1. A peeling strip 13 that slides on the inner wall surface of the horizontal groove 12 is provided inside the breaking zone 2. A cylinder 131 is provided at the top of the box 1. The output end of the cylinder 131 is fixedly connected to the side of the peeling strip 13.

[0026] The front side of the scraper plate 416 along its direction of movement is the working surface 4161, which is used to scrape and push the scum. The scraper plate 416 is provided with a connecting member 45 through the receiving cavity 4162 opened inside it.

[0027] The connector 45 includes an abutment rod 451 that slides perpendicularly to the working surface 4161. One end of the abutment rod 451 extends into the interior of the receiving cavity 4162 and is hinged to a rotating rod 452. The end of the rotating rod 452 away from the abutment rod 451 is hinged to a wedge rod 453. The outer end of the wedge rod 453 penetrates the receiving cavity 4162 and extends to the outer surface of the concave arc surface of the scraper plate 416. A locking block 454 is fixedly connected to the side of the connecting block 415. An elastic piece 455 connected to the inner end of the wedge rod 453 is provided on the inner surface of the receiving cavity 4162.

[0028] A protrusion 456 is fixedly connected to the side of the connecting block 415. An arc-shaped rod 457 is fixedly connected to the side of the protrusion 456 away from the locking block 454. A fixing block 458 that slides on the outer circumference of the arc-shaped rod 457 is fixedly connected to the concave arc surface of the scraper plate 416. A tension spring 459 is sleeved on the outer circumference of the arc-shaped rod 457.

[0029] The side of the locking block 454 near the scraper plate 416 has a wedge groove 4541 that fits with the outer end of the wedge rod 453, and the front side of the locking block 454 along its direction of movement is the contact surface.

[0030] In the existing technology, the liquid level in the flotation separation zone 4 is determined by the height of the baffle of the collection tank. However, the bottom of the scum layer formed after the flocculation reaction is not flush with the liquid surface, but is located below the liquid surface and has a certain depth. When removing scum, if the scraper 416 is higher than or flush with the height of the baffle of the collection tank, the scraper 416 cannot reach the scum layer below the liquid surface, resulting in incomplete scum removal. Some scum remains in the flotation zone and enters the subsequent treatment unit or effluent with the water flow, affecting the treatment effect. If the scraper 416 is lower than the height of the baffle of the collection tank, although it can contact the scum layer, when the scraper 416 rotates around the sprocket with the chain 414, its extension trajectory will have a gap with the baffle of the collection tank. The scum cannot be fully scraped and pushed above the baffle, resulting in incomplete scum removal and affecting the sewage treatment effect.

[0031] In the initial state, the connecting block 415 is flush with the side of the scraper plate 416, and the scraper plate 416 is located in the horizontal section below the chain 414. The elastic plate 455 in the connecting piece 45 is in the unfolded state. The outer end of the wedge rod 453 extends to the outer surface of the concave arc surface of the scraper plate 416 under the push of the elastic plate 455, and the distance is the longest within its stroke range. At this time, the angle between the wedge rod 453 and the rotating rod 452 is the largest within the range of motion. At the same time, the abutment rod 451 is also in the fully unfolded state, and the distance extended to the action surface 4161 is the largest. The side of the wedge rod 453 away from the action surface 4161 is in contact with the abutment surface of the locking block 454, realizing the initial limit of the scraper plate 416 and the connecting block 415, ensuring that the two can move synchronously. At this time, the cylinder 131 on the inner wall of the housing 1 is in the extended state, which drives the peeling strip 13 to be in the horizontal groove 12 near the water inlet pipe 10. The tension spring 459 is in the naturally contracted state, and the distance between the fixing block 458 and the protrusion 456 is at the minimum value within its stroke range.

[0032] The process of classifying and treating wastewater: Heavy metal-laden paint spraying wastewater enters the complex-breaking zone 2 through the inlet pipe 10. An external drive mechanism rotates the stirring shaft 21 within the complex-breaking zone 2, thoroughly mixing the wastewater with the complex-breaking agent to achieve the complex-breaking reaction of heavy metal ions in the wastewater. The complex-broken wastewater then flows naturally into the coagulation and flocculation zone 3 through the water passage on the baffle 11. The stirring shaft 21 within the coagulation and flocculation zone 3 rotates synchronously, thoroughly mixing the wastewater with the flocculant and coagulant aid, causing the pollutants in the wastewater to form dense flocs. Simultaneously, the aeration pipe 44 releases microbubbles into the air flotation separation zone 4. After the flocs flow into the air flotation separation zone 4 with the wastewater, they adsorb onto the microbubbles, causing the flocs to float to the liquid surface, forming scum, thus completing the air flotation separation process.

[0033] The process of removing scum by the scum scraper structure 41: While the wastewater undergoes air flotation separation, an external drive component drives one of the rotating shafts 413 to rotate. The rotating shaft 413 drives sprocket 1 411 and sprocket 2 412 to rotate counterclockwise synchronously. Sprocket 1 411 and sprocket 2 412 drive chain 414 to move in a circular motion. Chain 414 drives connecting block 415 to move synchronously. When connecting block 415 moves below chain 414, it begins to move horizontally to the right from below chain 414 towards sprocket 2 412.

[0034] At this time, the connector 45 remains in the extended state, the elastic sheet 455 is in the extended state, and the wedge rod 453 and the contact surface of the locking block 454 remain in contact. The working surface 4161 of the scraper plate 416 faces the direction of movement (right side) and contacts the top scum in the air flotation separation zone 4. The scum generates a leftward reaction force on the scraper plate 416. This reaction force drives the side of the wedge rod 453 away from the working surface 4161 to fit tightly against the contact surface of the locking block 454, further enhancing the connection stability between the two. When the connecting block 415 moves to the right, it simultaneously drives the scraper plate 416 to move to the right as well. The working surface 4161 of the scraper plate 416 continuously scrapes and pushes the scum on the liquid surface to the right, realizing the initial scraping and collection of scum.

[0035] As the chain 414 continues to move, the scraper 416 gradually moves to the position of the second sprocket 412 following the connecting block 415. As the second sprocket 412 continues to rotate counterclockwise, the outer end of the scraper 416 begins to rotate synchronously around the axis of the second sprocket 412.

[0036] Since the center of curvature of the arc-shaped overflow plate 43 coincides with the center of rotation of the second sprocket 412, and the distance from the center of rotation of the second sprocket 412 to the outer end of the scraper plate 416 is equal to the distance from the center of rotation of the second sprocket 412 to the surface of the arc-shaped overflow plate 43, the outer edge of the scraper plate 416 can rotate and move in close contact with the surface of the arc-shaped overflow plate 43 without collision or gap. During rotation, the action surface 4161 of the scraper plate 416 continuously scrapes and pushes the scum along the surface of the arc-shaped overflow plate 43 until the outer edge of the scraper plate 416 completely passes through the arc-shaped overflow plate 43, and the scum is completely scraped away into the scum trough on one side of the arc-shaped overflow plate 43, completing the collection of scum.

[0037] During this process, the working surface 4161 of the scraper 416 does not remain vertical as it passes the arc-shaped overflow plate 43. Instead, it gradually changes angle as the sprocket 412 rotates. Therefore, some residual scum remains above the working surface 4161. The working surface 4161 gradually changes to a horizontal and upward state. If the rotation continues, it will gradually change to face downward to the left. Due to the angle change, some scum will remain on the working surface 4161. If it is not removed in time, it will cause the scum to fall back into the air flotation separation zone 4 during the subsequent return stroke.

[0038] The process of releasing the limiting position between the scraper blade 416 and the connecting block 415: The second sprocket 412 continues to rotate counterclockwise, driving the connecting block 415 and the scraper 416 to continue rotating. The working surface 4161 of the scraper 416 gradually changes to a horizontal state. During this process, the connecting piece 45 always remains in an unfolded state until the working surface 4161 is in contact with the lower surface of the stripping strip 13.

[0039] At this time, the abutment rod 451 protruding from the action surface 4161 will first contact the lower surface of the peeling strip 13. The peeling strip 13 will generate a downward reaction force on the abutment rod 451, driving the abutment rod 451 to be squeezed into the receiving cavity 4162. During the squeezing process, the abutment rod 451 drives the rotating rod 452 hinged to it to rotate around the hinge point. When the rotating rod 452 rotates, it drives the wedge rod 453 hinged to it to also contract into the receiving cavity 4162. The side of the wedge rod 453 away from the action surface 4161 slides against the abutment surface of the locking block 454, and the included angle between the rotating rod 452 and the wedge rod 453 gradually decreases.

[0040] When the working surface 4161 of the scraper 416 becomes completely horizontal, the working surface 4161 is completely in contact with the lower surface of the stripping strip 13, and the outer end of the abutment rod 451 is flush with the lower surface of the stripping strip 13 and no longer protrudes outside the working surface 4161. At this time, the wedge rod 453 is in a fully retracted state, and the wedge rod 453 is completely disengaged from the locking block 454, and the limiting between the scraper 416 and the connecting block 415 is released. The second sprocket 412 rotates counterclockwise, causing the connecting block 415 to slide upwards on the chain 414. Meanwhile, the working surface 4161 of the scraper 416 is blocked by the lower surface of the stripping strip 13 and remains fixed in a horizontal position. The scraper 416 and the connecting block 415 move relative to each other, and the concave arc surface of the scraper 416 slides in contact with the convex arc surface of the connecting block 415 (the stopping of the scraper 416 does not affect the small-angle rotation of the connecting block 415 around the second sprocket 412). At the same time, the fixing block 458 slides along the arc-shaped rod 457, and the tension spring 459 sleeved on the arc-shaped rod 457 is stretched and unfolded to store elastic potential energy.

[0041] The process of removing residual scum from scraper blade 416: After the scraper plate 416 stops in the horizontal position, the cylinder 131 is activated. The output end of the cylinder 131 pulls the stripping strip 13 to slide to the right along the horizontal groove 12. The lower surface of the stripping strip 13 horizontally scrapes the working surface 4161 of the scraper plate 416, thoroughly scraping away the residual scum on the working surface 4161. This ensures that when the scraper plate 416 returns, its outer surface will not carry the scum back into the air flotation separation zone 4, thus avoiding secondary pollution.

[0042] During this process, after the peeling strip 13 slides a short distance to the right, its lower surface will disengage from the outer end of the abutment rod 451 and no longer exert a reaction force on the abutment rod 451. At this time, the elastic sheet 455 returns to the unfolded state under the action of its own elastic force, driving the wedge rod 453 to extend out of the receiving cavity 4162, and the connector 45 returns to the unfolded state again, preparing for the reset of the scraper plate 416.

[0043] After the stripping strip 13 has completely passed the action surface 4161 of the scraper plate 416, the connecting block 415 has rotated slightly around the sprocket 412. At this time, the tension spring 459 releases its stored elastic potential energy, generating tension and pulling the fixing block 458 to slide rapidly along the arc-shaped rod 457 towards the protrusion 456. The fixing block 458 drives the scraper plate 416 to slide synchronously, and the concave arc surface of the scraper plate 416 slides relative to the convex arc surface of the connecting block 415. During this process, the inclined surface of the wedge groove 4541 of the locking block 454 on the connecting block 415 quickly approaches the outer end inclined surface of the wedge rod 453. The inclined surface of the wedge groove 4541 exerts a squeezing force on the wedge rod 453 towards the inside of the receiving cavity 4162, driving the wedge rod 453 to slide into the receiving cavity 4162 until the scraper plate 416 and the side of the connecting block 415 are aligned again. At this time, the elastic plate 455 continues to unfold, pushing the wedge rod 453 to rise to the outside of the receiving cavity 4162. The side of the wedge rod 453 away from the action surface 4161 is once again in contact with the abutting surface of the locking block 454, completing the reset of the scraper plate 416.

[0044] After resetting, the scraper plate 416 continues to circulate with the connecting block 415 following the chain 414, returning to the position below the chain 414, and entering the next round of scum removal process. The clean water in the air flotation separation zone 4 is discharged through the bottom drainage structure, realizing the purification treatment of heavy metal paint spraying wastewater. The entire system operates continuously, completing the continuous treatment of wastewater.

[0045] The above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions will not cause the essence of the corresponding technical solutions to deviate from the protection scope of the technical solutions of the embodiments of the present invention.

Claims

1. A modular integrated wastewater treatment and recycling system for heavy metal paint spraying, characterized in that, include: The box (1) has a partition (11) fixedly installed inside. The box (1) has a series of interconnected zones (2), coagulation and flocculation zones (3) and air flotation separation zones (4) formed inside the box (1) along the direction of sewage flow. The air flotation separation zone (4) is equipped with a sludge scraping structure (41). The internal parts of the breaking zone (2) and the coagulation and flocculation zone (3) are rotatably connected to stirring shafts (21). The slag scraping structure (41) includes a sprocket one (411) and a sprocket two (412) disposed inside the air flotation separation zone (4). The sprocket one (411) and the sprocket two (412) are horizontally distributed in sequence. The sprocket two (412) is located on the side of the sprocket one (411) away from the breaking zone (2). The inner circumference of the sprocket one (411) and the sprocket two (412) are both fixedly installed with rotating shafts (411) that are rotatably connected to the inner wall surface of the box body (1). 13) Both the outer surfaces of the first sprocket (411) and the second sprocket (412) are meshed with chains (414). The outer surface of the chain (414) is fixedly connected with a connecting block (415). The outer surface of the connecting block (415) is provided with a scraper plate (416). The interior of the air flotation separation zone (4) is provided with a vertical plate (42) fixedly connected to the inner wall of the box (1). The top of the vertical plate (42) is fixedly connected with an arc-shaped overflow plate (43). The curvature center of the arc-shaped overflow plate (43) coincides with the rotation center of the second sprocket (412).

2. The modular integrated heavy metal spray painting wastewater treatment and recycling system according to claim 1, characterized in that: The outer surface of the box (1) is provided with an inlet pipe (10) that is connected to the inside of the breaking zone (2), and an aeration pipe (44) is provided on the side of the air flotation separation zone (4) near the coagulation and flocculation zone (3).

3. The modular integrated heavy metal paint spraying wastewater treatment and recycling system according to claim 1, characterized in that: The outer surface of the connecting block (415) is designed with a convex arc surface, and the side of the scraper plate (416) near the chain (414) is designed with a concave arc surface that slides in contact with the convex arc surface of the connecting block (415).

4. The modular integrated heavy metal spray painting wastewater treatment and recycling system according to claim 2, characterized in that: The inner wall surface of the box (1) is provided with a horizontal groove (12), and the inside of the breaking zone (2) is provided with a peeling strip (13) that slides against the inner wall surface of the horizontal groove (12). The top of the box (1) is provided with a cylinder (131), and the output end of the cylinder (131) is fixedly connected to the side of the peeling strip (13).

5. A modular integrated wastewater treatment and recycling system for heavy metal spray painting as described in claim 3, characterized in that: The front side of the scraper (416) along its direction of movement is the working surface (4161), and the scraper (416) is provided with a connector (45) through a receiving cavity (4162) opened inside it.

6. A modular integrated wastewater treatment and recycling system for heavy metal spray painting according to claim 5, characterized in that: The connector (45) includes an abutment rod (451) that slides perpendicularly to the working surface (4161). One end of the abutment rod (451) extends into the interior of the receiving cavity (4162) and is hinged to a rotating rod (452). The end of the rotating rod (452) away from the abutment rod (451) is hinged to a wedge rod (453). The outer end of the wedge rod (453) penetrates the receiving cavity (4162) and extends to the outer surface of the concave arc surface of the scraper plate (416). A locking block (454) is fixedly connected to the side of the connecting block (415). An elastic sheet (455) connected to the inner end of the wedge rod (453) is provided on the inner surface of the receiving cavity (4162).

7. A modular integrated wastewater treatment and recycling system for heavy metal spray painting according to claim 6, characterized in that: A protrusion (456) is fixedly connected to the side of the connecting block (415), and an arc-shaped rod (457) is fixedly connected to the side of the protrusion (456) away from the locking block (454). A fixing block (458) that slides on the outer circumference of the arc-shaped rod (457) is fixedly connected to the concave arc surface of the scraper (416), and a tension spring (459) is sleeved on the outer circumference of the arc-shaped rod (457).

8. A modular integrated wastewater treatment and recycling system for heavy metal paint spraying according to claim 7, characterized in that: The card block (454) has a wedge groove (4541) on the side near the scraper plate (416) that fits with the outer end of the wedge rod (453), and the front side of the card block (454) along its movement direction is the contact surface.

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