A tower machine coating line pretreatment wastewater treatment device

Abstract

The application discloses a tower machine coating line pretreatment wastewater treatment device and particularly relates to the field of wastewater treatment, which comprises a first filtering box, a second filtering box and a third filtering box, the inner cavities of the first filtering box, the second filtering box and the third filtering box are fixedly connected with conical plates, and the middle parts of the three conical plates are respectively provided with a first filter layer, a second filter layer and a third filter layer. The application firstly realizes the functions of precise drug distribution of the liquid ring, liquid scattering and diffusion by the first conical cover and the flow equalizing ball, liquid gathering by the liquid collecting bucket and secondary diffusion by the second conical cover, realizes the synchronous and continuous addition of waste liquid and additives, efficient mixing and continuous discharge of the mixed liquid, realizes the continuous input of wastewater, mixing in the flowing process, filtering and then direct discharge. The design can match the industrial production rhythm of the continuous generation of the tower machine coating line pretreatment wastewater, avoids the problems of treatment process interruption and waste liquid retention and accumulation.

Description

Technical Field

[0001] This invention relates to the field of wastewater treatment technology, and more specifically, to a wastewater treatment device for pretreatment of tower crane painting lines. Background Technology

[0002] Tower cranes, as large-scale engineering machinery, require their structural components to undergo coating treatment to improve corrosion resistance and extend service life. Pre-coating treatment is a crucial process for ensuring coating quality, mainly including degreasing, pickling and rust removal, and phosphating. Each step generates a large amount of combined wastewater. This wastewater has a complex composition, containing pollutants such as grease, surfactants, Fe²⁺, Zn²⁺, PO₄³⁻, fine suspended solids, and colloidal particles. Furthermore, it exhibits significant fluctuations in water quality and high pollutant concentrations. Existing wastewater treatment devices for tower crane painting lines typically use in-tank mixing to mix wastewater and additives. This requires injecting a measured amount of wastewater and additives into the tank, followed by mixing and reaction, before the mixture is discharged to the next treatment unit. This method of wastewater treatment cannot achieve continuous addition of wastewater and continuous discharge of the mixture, leading to interruptions in the treatment process and failing to match the continuous industrial production rhythm of tower crane painting line wastewater generation. Furthermore, to ensure effective mixing, a certain residence time is required during the mixing stage, further extending the treatment cycle for each batch of wastewater and significantly reducing overall wastewater treatment efficiency. Additionally, traditional filtration devices often have planar filter layers, allowing impurities to accumulate on the surface as wastewater flows through, increasing filtration resistance and reducing filtration efficiency. Therefore, a new wastewater treatment device for tower crane painting lines is proposed. Summary of the Invention

[0003] In order to overcome the above-mentioned defects of the prior art, the present invention provides a wastewater treatment device for the pretreatment of tower crane painting lines, so as to solve the problems mentioned in the background art.

[0004] To achieve the above objectives, the present invention provides the following technical solution: a pretreatment wastewater treatment device for tower crane painting lines, comprising a primary filter box, a secondary filter box, and a tertiary filter box, wherein conical plates are fixedly connected to the inner cavities of the primary filter box, the secondary filter box, and the tertiary filter box, respectively, and a first filter layer, a second filter layer, and a third filter layer are respectively provided in the middle portion of the three conical plates, and a mixing mechanism for automatically mixing with additives is provided at the top of the conical plates; The mixing mechanism includes a first rotating shaft that passes through a conical plate. A first conical cover, a liquid collection hopper, a second conical cover, and a sleeve are fitted in the middle of the first rotating shaft. A second scraper frame is fixedly connected to the outside of the sleeve. A liquid spraying ring is fixedly fitted on the outside of the top of the primary filter box. The top of the primary filter box is provided with a pretreatment cover for preliminary filtration of waste liquid. A first filter screen is fixedly connected to the middle of the pretreatment cover. The first filter screen and the bottom side of the conical plate are both connected to an impurity output pipe for discharging solid impurities. The top of the secondary filter box and the tertiary filter box are provided with top plates. The top of the two top plates are respectively provided with a first waste gas treatment box and a second waste gas treatment box.

[0005] In a preferred embodiment, the top of the primary filter box, the secondary filter box, and the tertiary filter box are all fixedly connected with connecting flanges, and the bottom of the pretreatment cover and the top plate are all fixedly connected with connecting flanges. The primary filter box and the pretreatment cover, the secondary filter box and the tertiary filter box are all fixedly connected to the corresponding top plate by connecting flanges and bolts.

[0006] In a preferred embodiment, the inclined surface of the conical plate is provided with strip-shaped holes, and the first filter layer, the second filter layer, and the third filter layer are all corresponding to the strip-shaped holes. The surfaces of the first filter layer, the second filter layer, and the third filter layer are adapted to the surface of the conical plate. The first filter layer is a quartz sand filter layer, the second filter layer is a double-layer filter layer of anthracite and quartz sand, and the third filter layer is a ceramic membrane filter layer.

[0007] In a preferred embodiment, a sealing gasket is provided between the first rotating shaft and the conical plate. The first rotating shaft has a first limiting groove and a second limiting groove on its outer side. The length of the first limiting groove is less than the length of the second limiting groove. A connecting slot is provided at the top of the first rotating shaft. The first conical cover is provided at the top of the liquid-gathering hopper. The second conical cover is provided at the bottom of the liquid-gathering hopper. A plurality of second connecting columns are fixedly connected between the second conical cover and the liquid-gathering hopper. The sleeve is located in the middle of the conical plate.

[0008] In a preferred embodiment, a first limiting block is fixedly connected to the middle of the first conical cover, the first limiting block is disposed in the middle of the first limiting groove and is adapted to the first limiting groove, a plurality of flow equalization balls are fixedly connected to the top of the first conical cover, the inner cavity of the spray ring is provided with a spray port corresponding to the surface of the first conical cover, and one side of the spray ring is connected to the medicine tank through a pipe and a booster pump.

[0009] In a preferred embodiment, a through hole is provided in the middle of the liquid collection hopper, a second limiting block is fixedly connected to the middle of the second conical cover, the second limiting block is disposed in the middle of the second limiting groove and is adapted to the second limiting groove, a third limiting block is fixedly connected to the middle of the sleeve, the third limiting block is disposed in the middle of the second limiting groove and is adapted to the second limiting groove, and the wall of the second scraper frame is in contact with the surface wall of the conical plate and the first filter layer, the second filter layer and the third filter layer.

[0010] In a preferred embodiment, the top of the pretreatment hood is fixedly connected to an inlet pipe and a first reduction motor. The output end of the first reduction motor is connected to a second rotating shaft. The second rotating shaft passes through the bottom of the first filter screen and is fixedly connected to a first connecting post that is inserted into a connecting slot and splinedly connected to the connecting slot. The middle part of the second rotating shaft is fixedly connected to a first scraping frame. The wall of the first scraping frame is in contact with the inner wall of the first filter screen.

[0011] In a preferred embodiment, both the secondary and tertiary filter boxes are equipped with a liquid pump and an inlet ring at their tops. The input end of the liquid pump at the top of the secondary filter box is connected to the bottom of the inner cavity of the primary filter box via a pipe. The input end of the liquid pump at the top of the tertiary filter box is connected to the bottom of the inner cavity of the secondary filter box via a pipe. The output end of the liquid pump is connected to the inner cavity of the inlet ring. An outlet is provided at the bottom of the inlet ring. A third geared motor and a pressure sensor are fixedly connected to the top of the top plate. The output end of the third geared motor is connected to a third connecting post that is inserted into a connecting slot and splined with the connecting slot.

[0012] In a preferred embodiment, two perforated plates are fixedly connected to the middle of both the first and second waste gas treatment boxes. An air pump and an exhaust pipe are provided on the top of the top plate. One end of the exhaust pipe passes through the middle of the top plate, and the other end is connected to the input end of the air pump. The output ends of the two air pumps are connected to the bottom side of the corresponding first and second waste gas treatment boxes through pipes equipped with check valves. A drain pipe and an exhaust pipe are connected to one side of the first and second waste gas treatment boxes.

[0013] In a preferred embodiment, the cross-sectional shape of the impurity output pipe is set to "Z" shape. One end of the plurality of impurity output pipes is connected to the bottom side of the corresponding first filter screen and conical plate, and the other end of the impurity output pipe extends to the outside. A valve is provided at the end of the impurity output pipe near the first filter screen and the conical plate. A second filter screen is provided on the bottom wall of the impurity output pipe. A third rotating shaft is provided in the middle of the impurity output pipe. A second reduction motor is connected to the end of the third rotating shaft away from the valve. A spiral conveying blade is fixedly connected to the middle of the third rotating shaft. The wall of the spiral conveying blade is tightly fitted with the inner wall of the impurity output pipe.

[0014] The technical effects and advantages of this invention are as follows: 1. This invention firstly achieves precise drug distribution by the spray ring, dispersion and diffusion of the liquid by the first conical hood and the flow equalization ball, convergence by the liquid collection hopper, and further diffusion by the second conical hood through the set mixing mechanism. This enables the synchronous and continuous addition of waste liquid and additives, efficient mixing and continuous discharge of the mixed liquid, and continuous input of wastewater. The wastewater is mixed and filtered during the flow process and then directly discharged. This design can match the industrial production rhythm of continuous generation of pretreatment wastewater in tower crane painting lines, avoiding the problems of process interruption and waste liquid retention and accumulation. At the same time, there is no need to set a separate stirring residence time to ensure the mixing effect, which greatly shortens the treatment cycle of a single batch of wastewater. 2. The present invention also uses a first filter screen to pre-filter impurities in wastewater, and uses a conical plate in conjunction with it. The conical inclined structure can guide the wastewater to flow evenly along the inclined surface through the filter layer. The gravity causes the impurities to slide to the bottom, reducing the accumulation of impurities on the surface of the filter layer. With the synchronous operation of the second scraper frame, impurities and flocs on the surface of the conical plate and the filter layer can be scraped off in real time, reducing the risk of filter layer blockage from the source, effectively alleviating the problem of increased filtration resistance, and ensuring stable filtration efficiency. 3. This invention integrates the mixing mechanism and the graded filtration mechanism into the same equipment system. The mixed waste liquid can flow directly along the conical plate through the filter layer to complete the purification, avoiding the problems of agent and waste liquid separation and insufficient reaction that occur during the transportation process after intermittent stirring in traditional devices. At the same time, the first and second waste gas treatment boxes can treat the harmful gases generated during the wastewater treatment process. The impurities after filtration can be discharged at any time through the impurity output pipe to ensure the continuity of filtration. In summary, through the interaction of the above-mentioned multiple functions, continuous treatment can be achieved in the wastewater treatment process, avoiding the problems of process interruption and waste liquid retention and accumulation, significantly shortening the treatment cycle of a single batch of wastewater, and at the same time, it can remove impurities and flocs from the surface of the conical plate and filter layer in real time, reducing the risk of filter layer clogging and improving the quality of wastewater treatment. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the overall structure of the present invention.

[0016] Figure 2 This is a schematic diagram of the cross-sectional structure of the present invention.

[0017] Figure 3 This is a schematic cross-sectional view of the primary filter box of the present invention.

[0018] Figure 4 This is a schematic diagram of the disassembled structure of the pretreatment cover and the second rotating shaft of the present invention.

[0019] Figure 5 This is a schematic diagram of the cross-sectional structure of the impurity output tube of the present invention.

[0020] Figure 6 This is a schematic diagram of the split structure of the hybrid mechanism of the present invention.

[0021] Figure 7 This is a schematic diagram of a partial cross-sectional structure of the top plate of the present invention.

[0022] The attached figures are labeled as follows: 1. Primary filter box; 2. Secondary filter box; 3. Tertiary filter box; 4. Conical plate; 5. First filter layer; 6. Second filter layer; 7. Third filter layer; 8. Pretreatment hood; 9. Top plate; 10. First filter screen; 11. Impurity output pipe; 12. Mixing mechanism; 13. First rotating shaft; 14. First conical hood; 15. Liquid collection hopper; 16. Second conical hood; 17. First waste gas treatment box; 18. Second waste gas treatment box; 19. Liquid pump; 20. Liquid inlet ring; 21. Liquid inlet pipe; 22. First geared motor; 23. Second rotating shaft; 24. First scraper frame; 5. First connecting post; 26. Connecting slot; 27. First limiting slot; 28. Second limiting slot; 29. ​​First limiting block; 30. Flow equalization ball; 31. Second limiting block; 32. Second connecting post; 33. Sleeve; 34. Second scraper frame; 35. Third limiting block; 36. Spray ring; 37. Spray nozzle; 38. Valve; 39. Second filter screen; 40. Third rotating shaft; 41. Spiral conveyor blade; 42. Second geared motor; 43. Third geared motor; 44. Third connecting post; 45. Perforated plate; 46. Exhaust pipe; 47. Air pump; 48. Pressure sensor. Detailed Implementation

[0023] 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 embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0024] Example 1 As attached Figure 1-7 The above-described wastewater treatment device for a tower crane painting line includes a primary filter box 1, a secondary filter box 2, and a tertiary filter box 3. The inner cavities of the primary filter box 1, the secondary filter box 2, and the tertiary filter box 3 are all fixedly connected with conical plates 4. The middle portions of the three conical plates 4 are respectively provided with a first filter layer 5, a second filter layer 6, and a third filter layer 7. The top of the conical plates 4 is provided with a mixing mechanism 12 for automatic mixing with additives. The tops of the primary filter box 1, the secondary filter box 2, and the tertiary filter box 3 are all fixedly connected with connecting flanges. The bottoms of the pretreatment cover 8 and the top plate 9 are also fixedly connected with connecting flanges. The primary filter box 1 and the pretreatment cover 8, the secondary filter box 2 and the tertiary filter box 3 and the corresponding top plate 9 are all fixedly connected by connecting flanges and bolts. The inclined surface of the conical plate 4 has strip-shaped holes. The first filter layer 5, the second filter layer 6 and the third filter layer 7 are all corresponding to the strip-shaped holes. The surfaces of the first filter layer 5, the second filter layer 6 and the third filter layer 7 are adapted to the surface of the conical plate 4. The first filter layer 5 is a quartz sand filter layer, the second filter layer 6 is a double-layer filter layer of anthracite and quartz sand, and the third filter layer 7 is a ceramic membrane filter layer. In this embodiment, fine suspended solids and colloidal particles are removed by the first filter layer 5 inside the primary filter box 1, heavy metal chelates and enhanced flocs are removed by the second filter layer 6 inside the secondary filter box 2, and fine suspended solids and calcium phosphate precipitates are intercepted by the third filter layer 7 inside the tertiary filter box 3, ensuring that the effluent meets the standards. At the same time, the conical plate 4 adopts a conical structure and is equipped with inclined nipple-shaped holes, which can guide the wastewater to flow evenly through the filter layer along the inclined surface, reduce the filtration efficiency, prolong the time of wastewater at the top of the conical plate 4, improve the flocculation and mixing effect, and thus improve the removal effect. Furthermore, the primary filter box 1 and the pretreatment cover 8, as well as the secondary and tertiary filter boxes and the top plate 9, are all fixedly connected by connecting flanges and bolts, making disassembly and assembly convenient and facilitating subsequent maintenance, replacement of filter layers, or cleaning of internal impurities.

[0025] Example 2 Based on Example 1, this embodiment also discloses a wastewater treatment device for the pretreatment of tower crane painting lines, as shown in the attached diagram. Figure 2 , 3 As shown in Figures 6 and 7, the mixing mechanism 12 includes a first rotating shaft 13 that passes through the conical plate 4. A first conical cover 14, a liquid collection hopper 15, a second conical cover 16, and a sleeve 33 are fitted in the middle of the first rotating shaft 13. A second scraper frame 34 is fixedly connected to the outside of the sleeve 33. A spray ring 36 is fixedly fitted on the outside of the top of the primary filter box 1. A sealing gasket is provided between the first rotating shaft 13 and the conical plate 4. A first limiting groove 27 and a second limiting groove 28 are provided on the outside of the first rotating shaft 13. The length of the first limiting groove 27 is less than the length of the second limiting groove 28. A connecting slot 26 is provided at the top of the first rotating shaft 13. A first conical cover 14 is located at the top of the liquid-gathering hopper 15, and a second conical cover 16 is located at the bottom of the liquid-gathering hopper 15. Multiple second connecting posts 32 are fixedly connected between the second conical cover 16 and the liquid-gathering hopper 15. A sleeve 33 is located in the middle of the conical plate 4. A first limiting block 29 is fixedly connected to the middle of the first conical cover 14. The first limiting block 29 is located in the middle of the first limiting groove 27 and is adapted to the first limiting groove 27. The top of the first conical cover 14... Multiple flow equalization balls 30 are fixedly connected to the part. The inner cavity of the spray ring 36 is provided with a spray nozzle 37 corresponding to the surface of the first conical cover 14. One side of the spray ring 36 is connected to the reagent tank through a pipe and a booster pump. A through hole is provided in the middle of the liquid collection hopper 15. A second limiting block 31 is fixedly connected to the middle of the second conical cover 16. The second limiting block 31 is located in the middle of the second limiting groove 28 and is adapted to the second limiting groove 28. A third limiting block 35 is fixedly connected to the middle of the sleeve 33. The third limiting block 35 is located in the middle of the second limiting groove 28 and is adapted to the second limiting groove 28. The wall of the second scraper frame 34 is in contact with the surface wall of the conical plate 4 and the first filter layer 5, the second filter layer 6, and the third filter layer 7. In this embodiment, by cooperating with the first limiting block 29 and the first limiting slot 27, and by cooperating with the second limiting block 31 and the third limiting block 35 and the second limiting slot 28, the first conical cover 14, the liquid collection hopper 15, the second conical cover 16, and the sleeve 33 can be driven to rotate when the first rotating shaft 13 rotates, thus preventing the components from shifting during operation. The sleeve 33 drives the second scraper frame 34 to rotate in the middle of the conical plate 4, which can scrape off the impurities and flocs accumulated on the surface of the conical plate 4 and the filter layer, thus preventing the filter layer from clogging and promoting the mixing reaction of the reagent and the wastewater. The sealing gasket between the first rotating shaft 13 and the conical plate 4 ensures the connection is sealed and prevents wastewater leakage. The agent is evenly sprayed onto the surface of the first conical cover 14 through the spray nozzle 37 of the spray ring 36, and the liquid falling from the top first filter screen 10 falls directly onto the first conical cover 14. The rotating first conical cover 14 causes the agent to diffuse along the conical surface. The flow equalization ball 30 further disperses the agent droplets, achieving preliminary mixing of the agent and wastewater. The liquid collection hopper 15 collects the preliminarily mixed wastewater and agent and gathers them in the middle. The mixture then falls through the through hole in the middle of the liquid collection hopper 15 onto the surface of the second conical cover 16. The rotation of the second conical cover 16 further enhances the mixing and improves the reaction efficiency between the agent and pollutants. The connection strength between the liquid hopper 15 and the second conical cover 16 can be improved by the cooperation of the second connecting column 32.

[0026] Example 3 Based on Example 1, this embodiment also discloses a wastewater treatment device for the pretreatment of tower crane painting lines, as shown in the attached diagram. Figure 1 , 2 As shown in Figures 4, 5, and 7, the top of the primary filter box 1 is provided with a pretreatment cover 8 for preliminary filtration of waste liquid. A first filter screen 10 is fixedly connected to the middle of the pretreatment cover 8. The first filter screen 10 and the bottom side of the conical plate 4 are both connected to an impurity output pipe 11 for discharging solid impurities. The top of the secondary filter box 2 and the tertiary filter box 3 are provided with a top plate 9. The top of the two top plates 9 are respectively provided with a first waste gas treatment box 17 and a second waste gas treatment box 18.

[0027] The top of the pretreatment hood 8 is fixedly connected to an inlet pipe 21 and a first reduction motor 22. The output end of the first reduction motor 22 is connected to a second rotating shaft 23. The second rotating shaft 23 passes through the bottom of the first filter screen 10 and is fixedly connected to a first connecting post 25 that is splinedly connected to the insertion connecting slot 26. The middle part of the second rotating shaft 23 is fixedly connected to a first scraping frame 24. The wall of the first scraping frame 24 fits against the inner wall of the first filter screen 10. The tops of the secondary filter box 2 and the tertiary filter box 3 are both equipped with a liquid pump 19 and an inlet ring 20. The input end of the liquid pump 19 at the top of the secondary filter box 2 is connected to the bottom of the inner cavity of the primary filter box 1 through a pipe. The input end of the liquid pump 19 at the top of the tertiary filter box 3 is connected to the bottom of the inner cavity of the secondary filter box 2 through a pipe. The output end of the liquid pump 19 is connected to the inlet ring 20. The inner cavities are connected. The bottom of the liquid inlet ring 20 is provided with a liquid outlet. The top of the top plate 9 is fixedly connected with a third reduction motor 43 and a pressure sensor 48. The output end of the third reduction motor 43 is connected to a third connecting post 44 that is splined to the insertion connecting slot 26. The middle of the first waste gas treatment box 17 and the second waste gas treatment box 18 are fixedly connected with two perforated plates 45. The top of the top plate 9 is provided with an air pump 47 and an exhaust pipe 46. One end of the exhaust pipe 46 passes through the middle of the top plate 9 and the other end is connected to the input end of the air pump 47. The output ends of the two air pumps 47 are connected to the bottom side of the corresponding first waste gas treatment box 17 and second waste gas treatment box 18 through pipes with check valves. The first waste gas treatment box 17 and the second waste gas treatment box 18 are connected to a drain pipe and an exhaust pipe on one side.

[0028] In this embodiment, wastewater is introduced into the pretreatment hood 8 through the inlet pipe 21. The first filter screen 10 can accurately intercept large particles of impurities such as paint residue and metal fragments in the wastewater. The first geared motor 22 drives the second rotating shaft 23 to rotate, which drives the first scraper frame 24 to rotate along the inner wall of the first filter screen 10, so as to scrape off the impurities accumulated on the filter screen in time, avoid filter screen blockage, and ensure pretreatment efficiency. The first connecting column 25 is splinedly connected to the connecting slot 26 of the first rotating shaft 13, so as to realize that a single motor can drive the mixing mechanism 12 to run at the same time, simplifying the power structure and reducing energy consumption. The third geared motor 43 controls the third connecting column 44 to drive the corresponding mixing mechanism 12 to run, which facilitates drive control. Moreover, the "Z"-shaped cross-section design of the impurity output pipe 11 can effectively prevent the odor generated during the wastewater treatment process from spreading from the pipe opening. Meanwhile, the exhaust pipe 46 accurately collects the exhaust gas generated in the secondary and tertiary filter boxes, such as hydrogen sulfide generated by the heavy metal capture reaction and dust-containing carbon dioxide generated by the lime milk neutralization reaction. The air pump 47 pumps the exhaust gas to the corresponding exhaust gas treatment box. The check valve on the pipeline can effectively prevent the treated exhaust gas from flowing back and avoid secondary pollution. Furthermore, starting the liquid pump 19 can transport the pre-filtered wastewater to the inlet ring 20, and the inlet ring 20 can evenly enter the middle of the corresponding filter box through the bottom outlet. The first waste gas treatment box 17 is equipped with an alkaline solution, which can efficiently adsorb acidic harmful gases such as hydrogen sulfide and convert them into non-toxic sulfides. Two porous plates 45 extend the contact time between the waste gas and the alkaline solution, thereby improving the adsorption efficiency. The second waste gas treatment box 18 is equipped with a dust removal liquid, which can adsorb dust in the waste gas and avoid dust pollution. The waste liquid after waste gas treatment is discharged through the drain pipe, and the qualified waste gas is discharged through the exhaust pipe. The pressure sensor 48 monitors the air pressure in the filter box in real time, which facilitates the start of the air pump 47 to release pressure and treat the corresponding first waste gas treatment box 17 and second waste gas treatment box 18.

[0029] As attached Figure 1 , 5 As shown, the cross-sectional shape of the impurity output pipe 11 is set to "Z" shape. One end of the multiple impurity output pipes 11 is connected to the bottom side of the corresponding first filter screen 10 and conical plate 4. The other end of the impurity output pipe 11 extends to the outside. A valve 38 is provided at the end of the impurity output pipe 11 near the first filter screen 10 and conical plate 4. A second filter screen 39 is provided on the bottom wall of the impurity output pipe 11. A third rotating shaft 40 is provided in the middle of the impurity output pipe 11. A second reduction motor 42 is connected to the end of the third rotating shaft 40 away from the valve 38. A spiral conveying blade 41 is fixedly connected to the middle of the third rotating shaft 40. The wall of the spiral conveying blade 41 is tightly fitted with the inner wall of the impurity output pipe 11. The working principle is as follows: When it is necessary to discharge impurities from the top of the conical plate 4 and the first filter screen 10, the valve 38 is opened to start the second reduction motor 42. At this time, the third rotating shaft 40 can be controlled to drive the spiral conveying blade 41 to rotate, which will transport the impurities entering the bottom of the impurity output pipe 11 to the top outlet. At the same time, the liquid inside the impurities can be discharged through the second filter screen 39, reducing waste liquid entrainment, improving water resource utilization, and avoiding impurity deposition that clogs the pipe, thereby improving discharge efficiency.

[0030] It should be noted that a controller is installed on one side of the primary filter box 1. The controller is electrically connected to each motor, liquid pump, solenoid valve and pressure sensor for easy drive control. The wall of the liquid collection hopper 15 is tightly fitted with the corresponding internal wall of the filter box to prevent liquid leakage. The reagent tank connected to the top spray ring 36 of the primary filter box 1 contains inorganic flocculant PAC. Through the coagulation effect of PAC, the fine suspended solids and colloidal particles in the wastewater, such as the fine oil droplets after the decomposition of emulsified grease and inorganic colloids, form primary flocs, which can be intercepted and filtered through the first filter layer 5. The reagent tank connected to the top spray ring 36 of the secondary filter box 2 contains a mixture of organic flocculant PAM and heavy metal scavenger. PAM adsorbs and entangles the primary flocs, forming larger and more stable flocs, thus improving the solid-liquid separation efficiency. The heavy metal scavenger undergoes a chelation reaction with heavy metal ions such as Fe²⁺ and Zn²⁺ in the wastewater to generate insoluble chelates, which can be filtered out by the second filter layer 6. The reagent tank connected to the top spray ring 36 of the three-stage filter box 3 contains lime milk Ca(OH)2 and a small amount of polyferric sulfate coagulant. The lime milk reacts with PO4³⁻ in the wastewater to form calcium phosphate precipitate. The coagulant adsorbs the residual fine flocs and colloidal particles to form suspended solids, which can be filtered by the third filter layer 7. As for the existing technology for controlling the addition of chemicals, flow meters are installed at corresponding positions in the primary filter box 1, secondary filter box 2, and tertiary filter box 3 to monitor the wastewater flow in real time. The controller automatically adjusts the dosage of the chemical pump according to the flow to achieve precise mixing. It can be set according to the implementation requirements, and will not be elaborated further.

[0031] Working principle of the invention: In use, the pretreatment wastewater of the tower crane painting line is introduced into the pretreatment hood 8 through the liquid inlet pipe 21. Large particulate impurities are filtered and intercepted by the first filter screen 10. At the same time, the first reduction motor 22 is started to control the second rotating shaft 23 to drive the first scraper frame 24 to rotate and scrape the impurities on the first filter screen 10 to avoid filter screen blockage. The second rotating shaft 23 drives the first rotating shaft 13 to rotate through the first connecting column 25, and starts the mixing mechanism 12 in the middle of the first-stage filter box 1. The pretreated wastewater enters the primary filter box 1. The spray ring 36 sprays PAC agent onto the surface of the first conical shroud 14 through the spray nozzle 37. The rotating first conical shroud 14 and the flow equalization ball 30 achieve the initial mixing of the agent and the wastewater. The mixed wastewater is collected by the liquid collection hopper 15 and falls onto the second conical shroud 16 for further mixing. PAC reacts with the fine suspended solids and colloidal particles in the wastewater to form primary flocs. The wastewater falls onto the conical plate 4 and is filtered through the first filter layer 5. At the same time, the first rotating shaft 13 drives the second scraper frame 34 to rotate and scrape off the deposits on the surface of the conical plate 4 and the first filter layer 5, and stirs and mixes the liquid in the middle of the conical plate 4 to improve the flocculation effect. The filtered wastewater falls to the bottom of the inner cavity of the primary filter box 1. Start the liquid pump 19 at the top of the secondary filter box 2 to transport the wastewater after primary filtration to the inlet ring 20 and evenly to the top of the inner cavity of the secondary filter box 2. Spray the mixture of PAM and heavy metal capture agent through the spray ring 36 and spray nozzle 37 at the top of the secondary filter box 2. Start the third reduction motor 43 at the top of the secondary filter box 2 to control the mixing mechanism 12 to rotate and mix. The wastewater falls on the conical plate 4 in the middle of the secondary filter box 2 and is filtered through the second filter layer 6, thus falling to the bottom of the inner cavity of the secondary filter box 2. Start the liquid pump 19 at the top of the three-stage filter box 3 to transport the wastewater after secondary filtration to the inside of the liquid inlet ring 20 and evenly input it into the top of the inner cavity of the three-stage filter box 3. Spray the mixture of lime milk and coagulant through the spray ring 36 and spray nozzle 37 at the top of the three-stage filter box 3. Start the third reduction motor 43 at the top of the secondary filter box 2 to control the mixing mechanism 12 to rotate and mix the wastewater onto the conical plate 4 in the middle of the secondary filter box 2. Filter it through the third filter layer 7 and then fall to the bottom of the inner cavity of the three-stage filter box 3 and be discharged through a discharge pipe. During the wastewater treatment process, when impurities in the middle of the first filter screen 10 and the conical plate 4 need to be discharged, the second filter layer 6 opens the corresponding valve 38, starts the second reduction motor 42, and drives the spiral conveying blade 41 to rotate, which can actively transport the impurities to the external collection device. During the transportation process, the liquid inside the impurities is discharged through the second filter screen 39, reducing waste liquid entrainment and improving water resource utilization. While the secondary filter box 2 and the tertiary filter box 3 are reacting, the pressure sensor 48 monitors the corresponding internal air pressure in real time. When the air pressure reaches the preset maximum value, the controller starts the air pump 47 to extract the exhaust gas from the corresponding secondary filter box 2 and the tertiary filter box 3 through the exhaust pipe 46 and deliver it to the middle of the corresponding first exhaust gas treatment box 17 and second exhaust gas treatment box 18 for exhaust gas treatment, and then discharge it.

[0032] The accompanying drawings of the embodiments disclosed in this invention only involve the structures involved in the embodiments of this disclosure. Other structures can refer to the general design. In the absence of conflict, the same embodiment and different embodiments of this invention can be combined with each other. In conclusion, the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A wastewater treatment device for pretreatment of tower crane painting line, comprising a primary filter box (1), a secondary filter box (2), and a tertiary filter box (3), characterized in that: The inner cavities of the primary filter box (1), the secondary filter box (2), and the tertiary filter box (3) are all fixedly connected with conical plates (4). The middle parts of the three conical plates (4) are respectively provided with a first filter layer (5), a second filter layer (6), and a third filter layer (7). The top of the conical plates (4) is provided with a mixing mechanism (12) that automatically mixes with the additives. The mixing mechanism (12) includes a first rotating shaft (13) that passes through the conical plate (4). A first conical cover (14), a liquid collection hopper (15), a second conical cover (16), and a sleeve (33) are sleeved in the middle of the first rotating shaft (13). A second scraper frame (34) is fixedly connected to the outside of the sleeve (33). A spray ring (36) is fixedly sleeved on the top of the primary filter box (1). The top of the primary filter box (1) is provided with a pretreatment cover (8) for preliminary filtration of waste liquid. A first filter screen (10) is fixedly connected to the middle of the pretreatment cover (8). The bottom side of the first filter screen (10) and the conical plate (4) are both connected with impurity output pipes (11) for discharging solid impurities. The top of the secondary filter box (2) and the tertiary filter box (3) is provided with a top plate (9). The top of the two top plates (9) is respectively provided with a first waste gas treatment box (17) and a second waste gas treatment box (18).

2. The wastewater treatment device for tower crane painting line pretreatment according to claim 1, characterized in that: The top of the primary filter box (1), the secondary filter box (2), and the tertiary filter box (3) are all fixedly connected with connecting flanges. The bottom of the pretreatment cover (8) and the top plate (9) are all fixedly connected with connecting flanges. The primary filter box (1) and the pretreatment cover (8), the secondary filter box (2), and the tertiary filter box (3) and the corresponding top plate (9) are all fixedly connected by connecting flanges and bolts.

3. The wastewater treatment device for tower crane painting line pretreatment according to claim 1, characterized in that: The tapered plate (4) has a slotted hole on its inclined surface. The first filter layer (5), the second filter layer (6), and the third filter layer (7) are all corresponding to the slotted hole. The surfaces of the first filter layer (5), the second filter layer (6), and the third filter layer (7) are adapted to the surface of the tapered plate (4). The first filter layer (5) is a quartz sand filter layer, the second filter layer (6) is a double-layer filter layer of anthracite and quartz sand, and the third filter layer (7) is a ceramic membrane filter layer.

4. The wastewater treatment device for tower crane painting line pretreatment according to claim 1, characterized in that: A sealing gasket is provided between the first rotating shaft (13) and the conical plate (4). The first rotating shaft (13) has a first limiting groove (27) and a second limiting groove (28) on its outside. The length of the first limiting groove (27) is less than the length of the second limiting groove (28). A connecting slot (26) is provided at the top of the first rotating shaft (13). The first conical cover (14) is located at the top of the liquid collection hopper (15). The second conical cover (16) is located at the bottom of the liquid collection hopper (15). A plurality of second connecting columns (32) are fixedly connected between the second conical cover (16) and the liquid collection hopper (15). The sleeve (33) is located in the middle of the conical plate (4).

5. The wastewater treatment device for tower crane painting line pretreatment according to claim 1, characterized in that: A first limiting block (29) is fixedly connected to the middle of the first conical cover (14). The first limiting block (29) is located in the middle of the first limiting groove (27) and is adapted to the first limiting groove (27). A plurality of flow equalization balls (30) are fixedly connected to the top of the first conical cover (14). The inner cavity of the spray ring (36) is provided with a spray port (37) corresponding to the surface of the first conical cover (14). One side of the spray ring (36) is connected to the medicine tank through a pipe and a booster pump.

6. The wastewater treatment device for tower crane painting line pretreatment according to claim 1, characterized in that: The liquid collection hopper (15) has a through hole in the middle. The second conical cover (16) is fixedly connected to the middle of a second limiting block (31). The second limiting block (31) is located in the middle of the second limiting groove (28) and is adapted to the second limiting groove (28). The sleeve (33) is fixedly connected to the middle of a third limiting block (35). The third limiting block (35) is located in the middle of the second limiting groove (28) and is adapted to the second limiting groove (28). The wall of the second scraper frame (34) is in contact with the surface wall of the conical plate (4) and the first filter layer (5), the second filter layer (6), and the third filter layer (7).

7. The wastewater treatment device for tower crane painting line pretreatment according to claim 1, characterized in that: The top of the pretreatment hood (8) is fixedly connected to an inlet pipe (21) and a first reduction motor (22). The output end of the first reduction motor (22) is connected to a second rotating shaft (23). The second rotating shaft (23) passes through the bottom of the first filter screen (10) and is fixedly connected to a first connecting post (25) that is splinedly connected to the insertion connecting slot (26). The middle part of the second rotating shaft (23) is fixedly connected to a first scraping frame (24). The wall of the first scraping frame (24) is in contact with the inner wall of the first filter screen (10).

8. The wastewater treatment device for tower crane painting line pretreatment according to claim 1, characterized in that: The top of both the secondary filter box (2) and the tertiary filter box (3) is equipped with a liquid pump (19) and an inlet ring (20). The input end of the liquid pump (19) at the top of the secondary filter box (2) is connected to the bottom of the inner cavity of the primary filter box (1) through a pipe. The input end of the liquid pump (19) at the top of the tertiary filter box (3) is connected to the bottom of the inner cavity of the secondary filter box (2) through a pipe. The output end of the liquid pump (19) is connected to the inner cavity of the inlet ring (20). The bottom of the inlet ring (20) is provided with an outlet. The top of the top plate (9) is fixedly connected with a third reduction motor (43) and a pressure sensor (48). The output end of the third reduction motor (43) is connected to a third connecting post (44) that is inserted into the connecting slot (26) and splinedly connected to the connecting slot (26).

9. The wastewater treatment device for tower crane painting line pretreatment according to claim 1, characterized in that: Two perforated plates (45) are fixedly connected to the middle of the first waste gas treatment box (17) and the second waste gas treatment box (18). An air pump (47) and an exhaust pipe (46) are provided on the top of the top plate (9). One end of the exhaust pipe (46) passes through the middle of the top plate (9) and the other end is connected to the input end of the air pump (47). The output ends of the two air pumps (47) are connected to the bottom side of the corresponding first waste gas treatment box (17) and second waste gas treatment box (18) through pipes equipped with check valves. A drain pipe and an exhaust pipe are connected to one side of the first waste gas treatment box (17) and the second waste gas treatment box (18).

10. The wastewater treatment device for tower crane painting line pretreatment according to claim 1, characterized in that: The cross-sectional shape of the impurity output pipe (11) is set to "Z" shape. One end of the multiple impurity output pipes (11) is connected to the bottom side of the corresponding first filter screen (10) and conical plate (4). The other end of the impurity output pipe (11) extends to the outside. A valve (38) is provided at the end of the impurity output pipe (11) near the first filter screen (10) and conical plate (4). A second filter screen (39) is provided on the bottom wall of the impurity output pipe (11). A third rotating shaft (40) is provided in the middle of the impurity output pipe (11). A second reduction motor (42) is connected to the end of the third rotating shaft (40) away from the valve (38). A spiral conveying blade (41) is fixedly connected in the middle of the third rotating shaft (40). The wall of the spiral conveying blade (41) is tightly fitted with the inner wall of the impurity output pipe (11).

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