Automatic centralized treatment method and system for dam area construction wastewater

Abstract

The invention relates to the technical field of wastewater treatment, and particularly provides an automatic centralized treatment method and system for dam area construction wastewater. The automatic centralized treatment system for the dam area construction wastewater comprises a shell, a transmission device and at least one slag scraping device, an air floatation tank is arranged below the shell; the transmission device drives the slag scraping device to circularly rotate and move, so that the slag scraping device is periodically immersed in the wastewater and translates to scrape impurities on the surface of the wastewater; the slag scraping device comprises a plurality of first slag scraping boxes and a plurality of second slag scraping boxes which are arranged in a staggered manner; filtering holes are formed in the parts, immersed in water, of filtering plates of the first slag scraping boxes and the second slag scraping boxes; the filter plate of the first slag scraping box protrudes out of the second slag scraping box in the direction deviating from the moving direction, and a filter screen is arranged on the side edge, protruding out of the second slag scraping box, of the first slag scraping box. According to the scheme provided by the invention, the overall flow area of wastewater passing through the slag scraping device is increased, so that the liquid resistance is reduced, and the cleaning efficiency is improved.

Description

Technical Field

[0001] This invention relates to the field of wastewater treatment technology, and in particular to an automated centralized treatment method and system for construction wastewater in dam areas. Background Technology

[0002] During the construction of hydropower projects, various types of scattered and difficult-to-collect wastewater, such as concrete flushing water from the dam area, are generated. Large and medium-sized hydropower stations are mostly located in high mountain and canyon areas with steep terrain and scarce land resources, making the construction of large-scale wastewater collection and treatment facilities extremely challenging.

[0003] Existing technologies mostly employ a combination of air flotation and flocculation to treat wastewater in dam areas. To adapt to changes in liquid level, scrapers typically extend below the liquid surface to simultaneously remove flocculated material. However, this deep penetration increases operating resistance, reducing cleaning efficiency. Furthermore, to avoid collisions between the scraper and the sidewall of the air flotation tank during operation, existing technologies involve the scraper rotating and rising after approaching the sidewall, thus passing over it. However, this upward movement creates a dead zone between the scraper and the sidewall, causing some impurities to escape and preventing thorough cleaning. Summary of the Invention

[0004] One objective of this invention is to reduce the liquid resistance encountered by the scraper when it moves in wastewater, thereby improving cleaning efficiency.

[0005] Another objective of this invention is to reduce the risk of impurities being missed during slag scraping by the slag scraping device and to improve the cleaning effect.

[0006] Specifically, this invention provides an automated centralized treatment system for construction wastewater in dam areas, comprising: a shell, a transmission device, and at least one sludge scraping device; an air flotation tank is disposed below the shell; the air flotation tank is used to hold wastewater and inject microbubbles into the wastewater, causing impurities in the wastewater to float to the surface; the transmission device is disposed inside the shell, and at least one sludge scraping device is disposed thereon; the transmission device drives the sludge scraping device to rotate and move cyclically, causing the sludge scraping device to periodically immerse itself in the wastewater and horizontally scrape away impurities from the surface of the wastewater; the sludge scraping device includes multiple first sludge scraping boxes. The system includes multiple second scraper boxes, multiple first scraper boxes, and multiple second scraper boxes, which are staggered in a horizontal direction perpendicular to the direction of movement, with adjacent first and second scraper boxes abutting against each other. The openings of both the first and second scraper boxes face the direction of movement, and the bottoms of both the first and second scraper boxes opposite to their openings are vertical filter plates. Each filter plate has filter holes in the part immersed in water. The filter plate of the first scraper box protrudes from the second scraper box away from the direction of movement, and a filter screen is provided on the side of the first scraper box protruding from the second scraper box.

[0007] Furthermore, the transmission device includes two synchronously driven chains arranged opposite each other, and the two ends of the slag scraper are fixedly connected to the two chains respectively.

[0008] Furthermore, the first and second scraper boxes also include side plates located on both sides of the filter plate and a bottom plate located at the bottom of the filter plate; wherein, the bottom plate extends beyond the side plates at the opening; during the process of immersion in wastewater and translation, the first scraper box gradually moves backward relative to the second scraper box.

[0009] Furthermore, the side plates of the first and second scraper boxes that abut against each other are respectively provided with a horizontal first sliding groove and a corresponding first slider.

[0010] Furthermore, a tension spring is provided between adjacent first and second scraper boxes; a slider assembly is provided at both ends of the top plate of the first scraper box, the slider assembly includes multiple second sliders spaced apart along the moving direction of the first scraper box, and multiple second sliding grooves are correspondingly provided on the top plate of the first scraper box; the second sliders are movably disposed in the second sliding grooves along the arrangement direction of the first scraper boxes; a third sliding groove is connected below the multiple second sliding grooves located at the same end, and the second sliders pass through the second sliding grooves and extend into the third sliding grooves; the opening of the third sliding groove faces the adjacent second scraper box, the first The bottom of the three-slide groove is provided with multiple grooves, each corresponding to a second slider. A first compression spring connected to the second slider is provided in each groove. A third slider is provided on the side plate of the second scraper box. The third slider extends into the third slide groove and is pushed against the end of the third slide groove away from the moving direction of the first scraper box by multiple second sliders. During the movement of the first scraper box in the wastewater, among the multiple second sliders in each slider group, starting from the end closest to the third slider, the second sliders move one by one along the arrangement direction of the first scraper box, providing sliding space for the third slider.

[0011] Furthermore, the filter screen is W-shaped. As it moves through the wastewater, it gradually expands into a U-shape and returns to its W-shape after leaving the wastewater.

[0012] Furthermore, the filter screen has hinge posts at both ends, which are hinged to the first scraper box; the bottom of the filter screen has a support plate fixedly connected to the first scraper box, and the support plate has a fourth sliding groove; the filter screen includes a first filter plate, a second filter plate, a third filter plate, and a fourth filter plate that are hinged in sequence; the bottom of the hinge rod of the second filter plate and the third filter plate has a fourth slider, which is movably disposed in the fourth sliding groove, and the end of the fourth slider away from the first scraper box has a second compression spring.

[0013] Furthermore, after the device moves horizontally in the wastewater until it comes into contact with the wall of the flotation tank, the scraper moves upward along the wall of the flotation tank to scrape off the impurities accumulated on the wall of the flotation tank.

[0014] Furthermore, a connecting assembly is provided between the slag scraping device and the transmission device. The connecting assembly includes a fixed block fixed on the transmission device and a fifth slider fixed on the slag scraping device. The fixed block is provided with a fifth sliding groove that is inclined toward the slag scraping device in its moving direction. A third compression spring is provided in the fifth sliding groove. The fifth slider is slidably disposed in the fifth sliding groove and abuts against the end of the third compression spring away from the transmission device.

[0015] The present invention also provides an automated centralized treatment method for construction wastewater in dam areas, applicable to any of the above-mentioned automated centralized treatment systems for construction wastewater in dam areas, comprising the following steps: injecting wastewater and microbubbles into an air flotation tank to make impurities in the wastewater float to the surface; activating a transmission device to drive a scraper to rotate and move in a cycle, so that the scraper periodically immerses itself in the wastewater and moves horizontally to scrape off impurities on the surface of the wastewater.

[0016] The beneficial effects of this invention are: This invention relates to an automated centralized treatment system for construction wastewater in dam areas. The system comprises a scraping device consisting of multiple staggered first and second scraping boxes. Filter holes are provided on the filter plates of both boxes, with the perforated portion immersed in the wastewater and the solid portion above the surface. The solid portion of the filter plate effectively scrapes away floating impurities while allowing wastewater below the surface to flow smoothly through the filter holes, collecting the impurities in the first and second scraping boxes, thus improving impurity removal efficiency. Furthermore, the filter plate of the first scraping box protrudes beyond the second scraping box, and filter screens are installed on the protruding sides of the first and second scraping boxes. This allows wastewater flowing towards the first scraping box to exit through both the filter holes on the filter plate and the filter screens on both sides during the scraping process. This increases the overall flow area of ​​the wastewater passing through the scraping device, reducing the liquid resistance encountered by the scraping device and improving cleaning efficiency.

[0017] Furthermore, the automated centralized treatment system for dam construction wastewater of the present invention, by setting up a slag scraper, moves in the wastewater to abut against the wall of the flotation tank and then moves upward along the wall of the flotation tank, thereby scraping off the impurities accumulated on the wall of the flotation tank, reducing the risk of impurity leakage and improving the cleaning effect.

[0018] The automated centralized treatment method for dam construction wastewater of the present invention, since it is applied to the aforementioned automated centralized treatment system for dam construction wastewater, also possesses the beneficial technical effects of the aforementioned automated centralized treatment system for dam construction wastewater. Attached Figure Description

[0019] The following sections will describe some specific embodiments of the invention in a detailed manner by way of example and not limitation, with reference to the accompanying drawings. The same reference numerals in the drawings denote the same or similar parts or components. In the drawings: Figure 1 This is a schematic diagram of an automated centralized treatment system for construction wastewater in dam areas according to an embodiment of the present invention; Figure 2 This is an exploded view of an automated centralized treatment system for construction wastewater in dam areas according to an embodiment of the present invention; Figure 3 yes Figure 2 A schematic enlarged view of region A in the middle; Figure 4 This is an exploded view of an automated centralized treatment system for dam construction wastewater according to another embodiment of the present invention, with the air flotation tank structure hidden. Figure 5 This is an exploded view of a slag scraping device according to an embodiment of the present invention; Figure 6 This is an exploded view of a connection component according to an embodiment of the present invention; Figure 7 This is a schematic diagram of the structure of a first slag scraper box and a second slag scraper box according to an embodiment of the present invention; Figure 8 This is a schematic diagram of the structure of the first and second scraper boxes from another angle according to an embodiment of the present invention; Figure 9 It is along Figure 8 A schematic cross-sectional view cut off by the section line BB in the diagram; Figure 10 This is an exploded view of the first slag scraper box according to an embodiment of the present invention; Figure 11 yes Figure 10 A schematic enlarged view of region C in the middle; Figure 12 This is an exploded view of a filter screen according to an embodiment of the present invention; Figure 13 This is a schematic diagram of the structure of an adjustment plate according to an embodiment of the present invention; Figure 14 yes Figure 13 A schematic enlarged view of region D in the middle; Figure 15 yes Figure 13 A schematic enlarged view of region E in the middle; Figure 16 yes Figure 9 A schematic diagram of the U-shaped structure of the filter screen in the middle; Figure 17 yes Figure 9A schematic diagram of the structure in which the first scraper box is moved backward relative to the second scraper box; Figure 18 yes Figure 17 A schematic enlarged view of the central region F; Figure 19 This is a schematic flowchart of an automated centralized treatment method for construction wastewater in dam areas according to an embodiment of the present invention.

[0020] in: 100. Shell; 110. Air flotation tank; 120. Adjusting plate; 130. Pressure bar assembly; 131. Pressure bar; 200. Transmission device; 210. Chain; 220. Drive motor; 230. Through transmission shaft; 240. Transmission gear; 300. Slag scraping device; 310. First slag scraping box; 311. First chute; 312. Second chute; 313. Third chute; 314. Groove; 315. Support plate; 316. Fourth chute; 320. Second slag scraping box; 321. First slider; 322. Third slider 330, Filter plate; 331, Filter hole; 340, Filter screen; 341, Hinge column; 342, First filter rotating plate; 343, Second filter rotating plate; 344, Third filter rotating plate; 345, Fourth filter rotating plate; 346, Hinge rod; 347, Fourth slider; 348, Second compression spring; 350, Tension spring; 360, Slider assembly; 361, Second slider; 362, First compression spring; 400, Connecting assembly; 410, Fixing block; 411, Fifth slide groove; 412, Third compression spring; 420, Fifth slider. Detailed Implementation

[0021] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below through embodiments and in conjunction with the accompanying drawings. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

[0022] The terms "first" and "second" used herein are 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, that is, include one or more of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified. When a feature "includes or contains" one or more of the features it encompasses, unless otherwise specifically stated, this indicates that other features are not excluded and may be further included.

[0023] Unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; 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; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art should be able to understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0024] The following reference Figures 1 to 19 This invention describes an automated centralized treatment method and system for dam construction wastewater.

[0025] This embodiment first provides an automated centralized treatment system for construction wastewater in dam areas. The automated centralized treatment system for construction wastewater in dam areas generally includes: a housing 100, a transmission device 200, and at least one slag scraper 300.

[0026] An air flotation tank 110 is provided below the housing 100. The air flotation tank 110 is used to hold wastewater and inject microbubbles into the wastewater, causing impurities in the wastewater to float to the surface. A transmission device 200 is disposed inside the housing 100, and at least one scraping device 300 is disposed thereon. The transmission device 200 drives the scraping device 300 to rotate and move cyclically, so that the scraping device 300 is periodically immersed in the wastewater and moves horizontally to scrape away impurities on the surface of the wastewater. The scraping device 300 includes multiple first scraping boxes 310 and multiple second scraping boxes 320, which are staggered along a horizontal direction perpendicular to the direction of movement, and adjacent first scraping boxes 310 and second scraping boxes 320 abut against each other. The openings of both the first scraper box 310 and the second scraper box 320 face the direction of movement. The bottoms of both boxes, opposite to their openings, are vertical filter plates 330. Each filter plate 330 has filter holes 331 in the portion submerged in water. The filter plate 330 of the first scraper box 310 protrudes from the second scraper box 320 away from the direction of movement, and a filter screen 340 is provided on the side of the first scraper box 310 protruding from the second scraper box 320.

[0027] In this embodiment, the sludge scraping device 300 is composed of multiple staggered first sludge scraping boxes 310 and second sludge scraping boxes 320. Filter holes 331 are provided on the filter plates 330 of the first and second sludge scraping boxes 310 and 320, such that the portion of the filter plate 330 with the filter holes 331 is immersed in the wastewater, while the solid portion is located above the wastewater surface. By effectively scraping away impurities floating on the liquid surface using the solid portion of the filter plate 330, wastewater below the liquid surface flows smoothly through the filter holes 331, collecting the impurities in the first and second sludge scraping boxes 310 and 320, thereby improving the impurity removal efficiency.

[0028] Furthermore, in this embodiment, the filter plate 330 of the first scraper box 310 protrudes from the second scraper box 320, and a filter screen 340 is provided on the side of the first scraper box 310 protruding from the second scraper box 320. This allows the wastewater flowing towards the first scraper box 310 to flow out through the filter holes 331 on the filter plate 330 and also through the filter screens 340 on both sides during the scraping process of the scraper device 300 immersed in the wastewater. This increases the overall flow area of ​​the wastewater as it passes through the scraper device 300, thereby reducing the liquid resistance encountered by the scraper device 300 when it moves in the wastewater and improving the cleaning efficiency.

[0029] In some preferred embodiments, a plurality of scraping devices 300 may be evenly arranged on the transmission device 200 to improve the efficiency of removing impurities.

[0030] The transmission device 200 includes two synchronously driven chains 210 arranged opposite each other, and the two ends of the slag scraping device 300 are fixedly connected to the two chains 210 respectively.

[0031] like Figure 1 , 2 As shown, two chains 210 are respectively mounted on the side wall of the housing 100 and are symmetrical to each other. A drive motor 220 is mounted on the outside of the side wall of the housing 100, which drives the two chains 210 to rotate synchronously in the direction shown in the figure through a drive shaft 230 and a drive gear 240.

[0032] In this embodiment, the synchronously driven chain 210 drives the slag scraping device 300 to move, making the movement of the slag scraping device 300 more stable and ensuring the continuity and stability of the slag scraping operation. In addition, the chain 210 has a simple structure, is sturdy and durable, and greatly reduces maintenance costs.

[0033] like Figure 5 As shown, in some embodiments, a first scraper box 310 and a second scraper box 320 are located at both ends of the scraper device 300. The first scraper box 310 and the second scraper box 320 located at both ends are fixedly connected to two chains 210 and respectively attached to the side walls on both sides of the air flotation tank 110.

[0034] Depending on the width of the flotation tank 110, the slag scraping device 300 can be adapted to it by increasing or decreasing its length (i.e., increasing the number of first slag scraping boxes 310 and second slag scraping boxes 320). Therefore, in some embodiments, there may be two first slag scraping boxes 310 or two second slag scraping boxes 320 located at both ends of the slag scraping device 300.

[0035] In some embodiments, the transmission device 200 may employ a belt-driven structure to drive the rotation and movement of the scraper 300.

[0036] In a further embodiment, the distance between the first scraper box 310 and the second scraper box 320 in the moving direction is adjustable.

[0037] The first scraper box 310 and the second scraper box 320 also include side plates located on both sides of the filter plate 330 and a bottom plate located at the bottom end of the filter plate 330. The bottom plate extends beyond the side plates at its opening. During the translational movement while immersed in wastewater, the first scraper box 310 gradually moves backward relative to the second scraper box 320.

[0038] In this embodiment, the first scraper box 310 is gradually moved backward relative to the second scraper box 320 during the translation process of being immersed in wastewater. This causes the side plates of the first scraper box 310 and the second scraper box 320 to gradually shift apart in the direction of movement. By utilizing the cooperation between the side plate of the second scraper box 320 and the bottom plate of the first scraper box 310, the space in the first scraper box 310 that can accommodate impurities is increased, thereby improving the scraping efficiency and scraping effect of the scraper device 300.

[0039] Furthermore, in this embodiment, the first scraper box 310 is gradually moved backward after being immersed in wastewater, minimizing the total contact area between the scraper device 300 and the wastewater immediately upon immersion. This reduces the probability of bubbles in the flotation tank 110 breaking upon contact with the side plate of the scraper device 300. Additionally, the space for accommodating impurities in the first scraper box 310 gradually increases. This minimizes the impact of the backward movement of the first scraper box 310 (i.e., the increased total contact area between the scraper device 300 and the wastewater) on bubble breakage while simultaneously meeting the impurity collection space requirements of the scraper device 300, thus improving the overall cleaning effect on impurities in the wastewater.

[0040] like Figure 7 As shown, filter holes 331 can also be provided on the bottom plates of the first scraper box 310 and the second scraper box 320. The bottom plates are inclined downwards and forwards in the direction of movement in the wastewater, so that after the bottom plates are removed from the wastewater, the impurities in the first scraper box 310 and the second scraper box 320 can slide off the bottom plates more effectively.

[0041] Each pair of adjacent first scraper boxes 310 can be connected together by connecting rods or connecting plates, and each pair of adjacent second scraper boxes 320 can also be connected together by connecting rods or connecting plates, so that the backward movement of multiple first scraper boxes 310 relative to multiple second scraper boxes 320 remains synchronized.

[0042] In some preferred embodiments, filter holes 331 may also be provided on the side plates of the first scraper box 310 and / or the second scraper box 320.

[0043] The first scraper box 310 and the second scraper box 320 are respectively provided with a horizontal first slide groove 311 and a corresponding first slider 321 on their side plates that abut against each other.

[0044] In this embodiment, by providing a first sliding groove 311 and a first sliding block 321 on the first slag scraper box 310 and the second slag scraper box 320 respectively, the sliding of the first slag scraper box 310 relative to the second slag scraper box 320 is more stable and smooth.

[0045] like Figure 10 As shown, in some embodiments, the first slag scraper box 310 may be provided with a plurality of parallel first sliding grooves 311, and the second slag scraper box 320 may be provided with a plurality of corresponding second sliding blocks 361, so that the moving direction of the first slag scraper box 310 is more precise.

[0046] A tension spring 350 is provided between adjacent first scraper boxes 310 and second scraper boxes 320. A slider assembly 360 is provided at each end of the top plate of the first scraper box 310. The slider assembly 360 includes multiple second sliders 361 spaced apart along the moving direction of the first scraper box 310. Multiple second sliding grooves 312 are correspondingly provided on the top plate of the first scraper box 310. The second sliders 361 are movably disposed in the second sliding grooves 312 along the arrangement direction of the first scraper boxes 310. A third sliding groove 313 is connected below the multiple second sliding grooves 312 located at the same end. The second sliders 361 pass through the second sliding grooves 312 and extend into the third sliding groove 313. The opening of the third sliding groove 313 faces the adjacent second scraper box 320. Multiple grooves 314 are provided at the bottom of the third sliding groove 313. Each groove 314 corresponds to one of the multiple second sliders 361. A first compression spring 362 connected to the second slider 361 is provided within each groove 314. A third slider 322 is provided on the side plate of the second scraper box 320. The third slider 322 extends into the third slide groove 313 and is pushed against the end of the third slide groove 313 away from the moving direction of the first scraper box 310 by a plurality of second sliders 361. During the movement of the first scraper box 310 in the wastewater, among the plurality of second sliders 361 in each slider group 360, starting from the end closest to the third slider 322, the second sliders 361 move one by one along the arrangement direction of the first scraper box 310, providing sliding space for the third slider 322.

[0047] In this embodiment, multiple second sliders 361 are provided on the top plate of the first scraper box 310, and these second sliders 361 slide sequentially away from the third slider 322. This causes the third slider 322 to slide gradually within the third groove 313. As the first scraper box 310 moves through the wastewater, it gradually moves backward relative to the second scraper box 320 under the impact of the water flow. This increases the space available for the first scraper box 310 to hold impurities, thus improving scraping efficiency. After the first scraper box 310 disengages from the adjusting plate 120, it resets under the action of the tension spring 350, and the second sliders 361 reset under the action of the first compression spring 362.

[0048] like Figures 10-11 , Figures 13-15As shown, in order to allow the multiple second sliders 361 to slide sequentially, in some embodiments, an adjusting plate 120 may be provided on the housing 100. A pressure strip group 130 is provided on the area of ​​the adjusting plate 120 opposite to each slider group 360. The pressure strip group 130 includes multiple spaced pressure strips 131. One end of each pressure strip 131 facing away from the moving direction of the first scraper box 310 is wedge-shaped, and the other end is flush. The lengths of the multiple pressure strips 131 decrease sequentially, and the first pressure strip 131 that presses against the second slider 361 can be integrally formed with the adjusting plate 120. The portion of each second slider 361 extending out of the second slide groove 312 forms an L-shape, and a gap is formed in the sliding direction of the vertical portions of two adjacent second sliders 361 extending out of the second slide groove 312. When the first scraper box 310 moves horizontally in the wastewater, the first pressure strip 131 first presses against the first second slider 361 to slide. Then, multiple pressure strips 131 are inserted into the gaps between the corresponding second sliders 361 in sequence, thereby pressing the multiple second sliders 361 to move one by one away from the end of the third slider 322, providing space for the sliding of the third slider 322. After the first scraper box 310 passes the adjusting plate 120, the second sliders 361 are reset under the action of the first compression spring 362. The end of the third slider 322 facing the filter screen 340 is wedge-shaped to ensure that after the first scraper box 310 is removed from the wastewater, it can smoothly push against the second sliders 361 and reset under the action of the tension spring 350.

[0049] A first countersunk hole may be provided on the second slider 361 at a position opposite to the first compression spring 362. One end of the first compression spring 362 abuts against the bottom of the first countersunk hole, and the other end abuts against the bottom of the groove 314. After the second slider 361 slides away from the third slider 322, the first compression spring 362 is compressed into the first countersunk hole.

[0050] In order to make the multiple second sliders 361 slide one by one, in some other embodiments, each second slider 361 may be provided with a motor, and the multiple motors drive the second sliders 361 to move one by one according to a preset program.

[0051] In some embodiments, guide blocks may be provided on the first slag scraper box 310 and the second slag scraper box 320, and corresponding guide grooves may be provided on the adjusting plate 120, so that the first slag scraper box 310 and the second slag scraper box 320 slide more smoothly when passing through the adjusting plate 120.

[0052] The filter screen 340 is W-shaped. As it moves through the wastewater, the filter screen 340 gradually expands into a U-shape and returns to a W-shape after leaving the wastewater.

[0053] In this embodiment, the filter screen 340 gradually expands into a U-shape as it moves through the wastewater. This not only loosens the impurities accumulated on the filter screen 340 due to its deformation, reducing the risk of impurities caking on the screen, but also increases the effective flow area of ​​the liquid, improving the smoothness of wastewater flow through the filter screen 340. Furthermore, it increases the volume of the filter screen 340, thereby removing more impurities. After leaving the wastewater, the filter screen 340 returns to a W-shape, further facilitating the discharge of accumulated impurities.

[0054] The filter screen 340 has hinge posts 341 at both ends, which are hinged to the first scraper box 310. The bottom of the filter screen 340 has a support plate 315 fixedly connected to the first scraper box 310, and the support plate 315 has a fourth sliding groove 316. The filter screen 340 includes a first filter rotating plate 342, a second filter rotating plate 343, a third filter rotating plate 344, and a fourth filter rotating plate 345, which are sequentially hinged. The bottom of the hinge rod 346 of the second filter rotating plate 343 and the third filter rotating plate 344 has a fourth slider 347, which is movably disposed in the fourth sliding groove 316, and a second compression spring 348 is provided at the end of the fourth slider 347 away from the first scraper box 310.

[0055] In this embodiment, the filter screen 340 is composed of a first filter rotating plate 342, a second filter rotating plate 343, a third filter rotating plate 344, and a fourth filter rotating plate 345, which are hinged sequentially. The pressure applied to the filter screen 340 when wastewater flows through it pushes the filter screen 340 against the elastic force of the second compression spring 348. This makes the degree of opening of the filter screen 340 positively correlated with the amount of impurities accumulated inside the filter screen 340 and the degree of clogging, thereby improving the cleaning effect. The elastic force of the second compression spring 348 causes the filter screen 340 to automatically return to its original position after being detached from the wastewater, thus automatically squeezing out the accumulated impurities. This design is not only simple and low-cost, but also stable and reliable in operation.

[0056] like Figure 18 As shown, the fourth slide groove 316 is arranged parallel to the axis of symmetry of the two hinge pillars 341, which makes the movement of the fourth slider 347 in the fourth slide groove 316 smoother when the filter screen 340 deforms. A second countersunk hole can be provided at the end of the fourth slide groove 316 away from the side plate of the first scraper box 310. After the filter screen 340 unfolds from a W shape to a U shape, the second compression spring 348 is compressed into the second countersunk hole.

[0057] In some embodiments, the upper and lower ends of the filter screen 340 may be provided with support plates 315, and the two support plates 315 may be provided with a fourth slide groove 316 respectively. The two ends of the hinge rod 346 may be provided with a fourth slider 347 and a second compression spring 348 respectively.

[0058] After being moved horizontally in the wastewater until it comes into contact with the wall of the flotation tank 110, the sludge scraping device 300 moves upward along the wall of the flotation tank 110 to scrape off the impurities accumulated on the wall of the flotation tank 110.

[0059] In this embodiment, the sludge scraping device 300 moves in the wastewater until it comes into contact with the wall of the flotation tank 110, and then moves upward along the wall of the flotation tank 110 to scrape off the impurities accumulated on the wall of the flotation tank 110, thereby reducing the risk of impurity leakage and improving the cleaning effect.

[0060] To enable the scraper 300 to move upward along the wall of the flotation tank 110 after contacting the tank wall, in some embodiments, a connecting assembly 400 is provided between the scraper 300 and the transmission device 200. The connecting assembly 400 includes a fixing block 410 fixed to the transmission device 200 and a fifth slider 420 fixed to the scraper 300. The fixing block 410 is provided with a fifth sliding groove 411 inclined towards the scraper 300 in its moving direction, and a third compression spring 412 is provided in the fifth sliding groove 411. The fifth slider 420 is slidably disposed in the fifth sliding groove 411 and abuts against the end of the third compression spring 412 away from the transmission device 200.

[0061] In this embodiment, a fixing block 410 is provided on the transmission device 200, and a fifth sliding groove 411 is provided on the fixing block 410 that is inclined toward the slag scraping device 300 along its moving direction. After the slag scraping device 300 abuts against the wall of the flotation tank 110, when the transmission device 200 drives the slag scraping device 300 to continue moving, the fifth slider 420 on the slag scraping device 300 moves obliquely backward and upward along the fifth sliding groove 411, so that the slag scraping device 300 moves upward along the wall of the flotation tank 110. This not only has a simple structure and reliable operation, but also reduces the risk of jamming of the transmission device 200 and improves its service life.

[0062] Furthermore, after the slag scraping device 300 disengages from the wall of the flotation tank 110, the fifth slider 420 resets in the fifth slide groove 411 under the elastic force of the third compression spring 412, thereby causing the slag scraping device 300 to tilt downward and vibrate, thus allowing the impurities on the slag scraping device 300 to fall off better and ensuring the subsequent slag scraping effect.

[0063] In order to enable the scraper 300 to move upward along the wall of the flotation tank 110 after it comes into contact with the wall of the flotation tank 110, in some embodiments, the transmission device 200 can move upward as a whole after detecting that the scraper 300 comes into contact with the wall of the flotation tank 110, thereby driving the scraper 300 to move upward and scraping off the impurities accumulated on the wall of the flotation tank 110.

[0064] In some embodiments, the inner wall of the housing 100, corresponding to the moving area of ​​the scraper device 300 after it leaves the liquid surface, is provided with at least one set of high-pressure flushing nozzles. The nozzles face the second slide groove 312 and the third slide groove 313 of the slider assembly 360, and the first slide groove 311 of the first scraper box 310 and the second scraper box 320. The high-pressure flushing nozzles are linked to the drive motor 220 of the transmission device 200. When the scraper device 300 leaves the wastewater surface and moves to the preset flushing area, the nozzles activate high-pressure flushing, and the flushing duration is adapted to the cycle of the scraper device 300. The specific working process of the automated centralized treatment system for dam construction wastewater provided by the present invention will be described in conjunction with the above embodiments: First, wastewater and microbubbles are injected into the flotation tank 110, causing impurities in the wastewater to float to the surface. Then, the transmission device 200 is controlled to drive the scraper device 300 to rotate and move in a cycle, so that the scraper device 300 is periodically immersed in the wastewater and moves horizontally to scrape off impurities on the surface of the wastewater.

[0065] During the process of the scraping device 300 moving horizontally in the wastewater, the first scraping box 310 gradually moves backward relative to the second scraping box 320, while the filter screen 340 gradually unfolds from a W shape to a U shape, thereby increasing the space for impurities to be contained.

[0066] After the slag scraper 300 moves to contact the bottom of the flotation tank 110, the slag scraper 300 moves up along the tank wall of the flotation tank 110 to scrape the impurities out of the flotation tank 110.

[0067] After the scraper 300 disengages from the wall of the flotation tank 110, it rotates and moves under the drive of the transmission device 200, circulating into the wastewater to scrape off impurities.

[0068] like Figure 19 As shown, this embodiment also provides an automated centralized treatment method for dam construction wastewater, applicable to any of the automated centralized treatment systems for dam construction wastewater described above. The automated centralized treatment method for dam construction wastewater includes the following steps: S101, wastewater and microbubbles are injected into the flotation tank 110 to make the impurities in the wastewater float to the surface.

[0069] S102, start the transmission device 200, drive the scraper device 300 to rotate and move in a cycle, so that the scraper device 300 periodically immerses in the wastewater and moves horizontally to scrape off the impurities on the surface of the wastewater.

[0070] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0071] The embodiments described above are merely illustrative of several implementations of the present invention, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of the invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these modifications and improvements all fall within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the appended claims.

Claims

1. An automated centralized treatment system for construction wastewater in dam areas, characterized in that, include: The shell has an air flotation tank at the bottom; the air flotation tank is used to hold wastewater and inject micro air bubbles into the wastewater to make impurities in the wastewater float to the surface. A transmission device is installed inside the housing, and at least one slag scraping device is installed on it; the transmission device drives the slag scraping device to rotate and move in a cycle, so that the slag scraping device is periodically immersed in the wastewater and moves horizontally to scrape off impurities on the surface of the wastewater. The slag scraping device includes a plurality of first slag scraping boxes and a plurality of second slag scraping boxes. The plurality of first slag scraping boxes and the plurality of second slag scraping boxes are staggered along a horizontal direction perpendicular to the moving direction, and adjacent first slag scraping boxes and second slag scraping boxes abut against each other. The openings of both the first and second scraper boxes face the direction of movement. The bottoms of both the first and second scraper boxes opposite to the openings are vertical filter plates. Each filter plate has filter holes in the part immersed in water. The filter plate of the first scraper box protrudes from the second scraper box away from the direction of movement, and a filter screen is provided on the side of the first scraper box that protrudes from the second scraper box.

2. The automated centralized treatment system for construction wastewater in dam areas according to claim 1, characterized in that, The transmission device includes two synchronously driven chains arranged opposite each other, and the two ends of the slag scraper are respectively fixedly connected to the two chains.

3. The automated centralized treatment system for dam construction wastewater according to claim 1, characterized in that, The first slag scraper box and the second slag scraper box further include side plates located on both sides of the filter plate and a bottom plate located at the bottom end of the filter plate; wherein the bottom plate extends beyond the side plates at the opening; During the process of immersion in wastewater and translation, the first scraper box gradually moves backward relative to the second scraper box.

4. The automated centralized treatment system for dam construction wastewater according to claim 3, characterized in that, The first slag scraper box and the second slag scraper box are respectively provided with a horizontal first sliding groove and a corresponding first slider on the side plates that abut against each other.

5. The automated centralized treatment system for dam construction wastewater according to claim 3, characterized in that, A tension spring is provided between adjacent first and second scraper boxes; The top plate of the first slag scraper box has a slider assembly at each end. The slider assembly includes multiple second sliders spaced apart along the moving direction of the first slag scraper box. The top plate of the first slag scraper box has multiple second sliding grooves. The second sliders are movably disposed in the second sliding grooves along the arrangement direction of the first slag scraper box. A third sliding groove is connected below the multiple second sliding grooves located at the same end. The second sliders pass through the second sliding grooves and extend into the third sliding grooves. The opening of the third sliding groove faces the adjacent second slag scraper box. The bottom of the third sliding groove has multiple grooves, each of which corresponds to one of the multiple second sliders. A first compression spring connected to the second slider is disposed in each groove. A third slider is provided on the side plate of the second slag scraper box. The third slider extends into the third slide groove and is pushed against the end of the third slide groove away from the moving direction of the first slag scraper box by a plurality of second sliders. As the first scraper box moves through the wastewater, in each of the multiple second sliders in the slider group, starting from the end closest to the third slider, the second sliders move one by one along the arrangement direction of the first scraper box, providing sliding space for the third slider.

6. The automated centralized treatment system for dam construction wastewater according to claim 1, characterized in that, The filter screen is W-shaped. As it moves through the wastewater, it gradually expands into a U-shape and returns to its W-shape after leaving the wastewater.

7. The automated centralized treatment system for dam construction wastewater according to claim 6, characterized in that, The filter screen is provided with hinged posts at both ends, and the hinged posts are hinged to the first slag scraper box; the bottom of the filter screen is provided with a support plate that is fixedly connected to the first slag scraper box, and the support plate is provided with a fourth sliding groove. The filter screen includes a first filter plate, a second filter plate, a third filter plate, and a fourth filter plate that are hinged together in sequence; a fourth slider is provided at the bottom of the hinge rod of the second filter plate and the third filter plate, the fourth slider is movably disposed in the fourth slide groove, and a second compression spring is provided at the end of the fourth slider away from the first slag box.

8. The automated centralized treatment system for dam construction wastewater according to claim 1, characterized in that, After being moved horizontally in the wastewater until it comes into contact with the wall of the flotation tank, the sludge scraping device moves upward along the wall of the flotation tank to scrape off the impurities accumulated on the wall of the flotation tank.

9. The automated centralized treatment system for dam construction wastewater according to claim 8, characterized in that, A connecting assembly is provided between the slag scraping device and the transmission device. The connecting assembly includes a fixing block fixed on the transmission device and a fifth slider fixed on the slag scraping device. The fixing block is provided with a fifth sliding groove that is inclined toward the slag scraping device in its moving direction. A third compression spring is provided in the fifth sliding groove. The fifth slider is slidably disposed in the fifth sliding groove and abuts against the end of the third compression spring away from the transmission device.

10. An automated centralized treatment method for construction wastewater in dam areas, characterized in that, An automated centralized treatment system for dam construction wastewater, as described in any one of claims 1 to 9, comprises the following steps: Wastewater and tiny air bubbles are injected into the flotation tank, causing impurities in the wastewater to float to the surface. Start the transmission device to drive the slag scraper to rotate and move in a cycle, so that the slag scraper is periodically immersed in the wastewater and moves horizontally to scrape off the impurities on the surface of the wastewater.

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