Filtering device for water-based paint production

Abstract

The invention belongs to the technical field of filtering devices, and discloses a filtering device for water-based paint production, the filtering device comprises a metal separation mechanism, a multi-stage filtering mechanism and a cleaning mechanism, an inclined U-shaped trough is arranged in a separation box of the metal separation mechanism, the U-shaped trough rotates around a rotating shaft in a reciprocating manner, and an electromagnetic wire is mounted at the outer bottom of the U-shaped trough and can adsorb, dump and separate metal impurities; double groups of moving bins are slidably mounted in a filter box of the multi-stage filter mechanism, multi-stage filter plates are obliquely arranged in the moving bins to realize graded filtration of coatings, discharge pipes and water nozzles corresponding to the filter plates are arranged in double cleaning boxes of the cleaning mechanism, the moving bins are driven by telescopic cylinders to switch to realize online cleaning of the filter plates, and the double moving bins and the double cleaning boxes alternately work to guarantee production continuity. The water-based paint filtering device integrally forms an integrated structure, can realize separation and graded filtration of metal impurities and online cleaning of the filter plate, does not need shutdown disassembly, improves the water-based paint filtering efficiency, and is convenient to maintain.

Description

A filtration device for water-based coating production Technical Field

[0001] This invention belongs to the field of filtration device technology, and specifically relates to a filtration device for the production of water-based coatings. Background Technology

[0002] Water-based coatings are coating products that use water as a solvent or dispersion medium. With their advantages such as environmental friendliness, low VOCs, convenient application, and strong compatibility, they are gradually replacing traditional solvent-based coatings and becoming the core choice in fields such as architectural coatings, industrial corrosion protection, and furniture manufacturing. In the industrial production process of water-based coatings, the filtration process is a crucial step in ensuring the final quality of the product. Its core function is to remove metallic impurities, solid particles, coating lumps, fibrous impurities, etc., generated during the coating preparation process. This prevents residual impurities from affecting the coating's core properties such as film uniformity, hiding power, weather resistance, and adhesion. It also prevents impurities from causing wear and blockage to production equipment such as pumps, mixing tanks, and spraying equipment, ensuring the continuous and stable production process. As the application scenarios of water-based coatings continue to expand, market demands for coating quality are constantly increasing. This requires not only higher filtration precision to meet the needs of high-end coatings but also filtration devices with efficient separation capabilities, convenient maintenance, and automated operation to meet the pace of large-scale production. Single filtration processes are no longer sufficient to address the characteristics of water-based coatings, such as a wide range of impurity particle sizes, high viscosity, and easy adhesion. The industry urgently needs an integrated filtration device that can achieve deep separation of metal impurities, multi-stage particle size classification, and online cleaning and maintenance, in order to overcome the limitations of existing filtration processes and adapt to the development trend of high-quality and large-scale water-based coatings.

[0003] Currently, filtration devices used in water-based coating production are mainly divided into three categories, all of which address the basic needs of coating filtration to some extent, but each also has its own technical limitations. The first category is a single-mesh filter, which separates impurities through a single-pore size filter. It has a simple structure and low cost, but its filtration precision is limited and it cannot classify impurities based on particle size differences in the coating. For water-based coatings with a large particle size range, fine impurities may remain, or coarse impurities may cause filter clogging. Furthermore, the fixed filter requires complete disassembly and cleaning after shutdown, resulting in extremely low maintenance efficiency and severely impacting production continuity. The second category is a combination of magnetic separation and simple filtration. After removing metallic impurities from the coating through a magnetic structure, a single-layer filter is used for preliminary filtration. While this solves the key issue of metallic impurities, the lack of linkage between the metal separation mechanism and the subsequent filtration mechanism leads to mixing and backflow of the coating during flow, reducing separation efficiency. Moreover, the separated metallic impurities cannot be collected separately from the coating impurities, increasing the cost and difficulty of subsequent processing. The third type is a device with multi-stage filtration function. It achieves graded filtration by gradually reducing the pore size of multiple layers of filter screens, which improves the separation accuracy to a certain extent. However, all multi-stage filter screens are fixedly installed. When a filter screen of a certain stage becomes clogged, the entire filter unit needs to be stopped and disassembled for cleaning. The maintenance process is cumbersome and time-consuming. At the same time, this type of device lacks a matching online cleaning mechanism, which cannot achieve rapid cleaning and restoration of the filter screen, further restricting production efficiency. Summary of the Invention

[0004] In view of the problems raised in the background art above, the object of the present invention is to provide a filtration device for the production of water-based coatings.

[0005] To achieve the above technical objectives, the present invention adopts the following technical solution: a filtration device for water-based coating production, comprising a metal separation mechanism, a multi-stage filtration mechanism, and a cleaning mechanism; the metal separation mechanism includes a separation box, which has an inlet and a metal outlet; a rotating shaft is rotatably mounted inside the separation box; a motor is connected to the power end of the rotating shaft; and a U-shaped material trough is fixedly connected to the other end of the rotating shaft. The U-shaped material trough is inclined and reciprocates within the separation box about the rotating shaft as its axis, thus tilting the material. The operation involves an electromagnetic wire installed at the bottom of the U-shaped material trough, which is equipped with a controllable switch. Under the control of the controllable switch, the electromagnetic wire causes the U-shaped material trough to be magnetized or demagnetized as needed. The separation box has a primary discharge port at the output end of the U-shaped material trough. The multi-stage filtration mechanism includes a filter box, inside which a movable chamber is slidably installed. Multiple filter plates with different pore sizes are obliquely installed in the movable chamber. The filter plates are installed with pore sizes decreasing from top to bottom. The input end of the uppermost filter plate is located at... Two sets of mobile chambers are installed side-by-side, connected to the primary discharge port. A partition forms a common wall between the two sets of mobile chambers. The filter plates on both sets of mobile chambers are installed in the same position. Each set of mobile chambers has a U-shaped structure, with only its top and bottom ends and the corresponding discharge end of the filter plate open; the rest of the area is closed. The filter box has a secondary discharge port that connects to the discharge end of each filter plate. The cleaning mechanism includes cleaning boxes located on both sides of the filter box. The internal structure of the two cleaning boxes is identical. The cleaning boxes contain... The system includes pipes of corresponding quantity and position to the filter plates. Each pipe has a water nozzle at its output end, with the nozzle output end corresponding to the surface of the filter plate. All pipes share a single vertical pipe as their input end. This vertical pipe passes through the top of the cleaning tank and connects to the water supply circuit. A telescopic cylinder is fixedly installed on the outer wall of one of the cleaning tanks. The output end of the telescopic cylinder is connected to the outer wall of the movable chamber. The telescopic cylinder serves as the power source for the movable chamber, enabling it to move and switch between the filter tank and the two cleaning tanks. The lower end of each cleaning tank is a water outlet.

[0006] Further specified, the inclination of the U-shaped material trough is thirty degrees, and several air nozzles are installed on the upper side of the output end of the U-shaped material trough. The output end of the air nozzles acts on the entire inner bottom surface of the U-shaped material trough, and the input end of the air nozzles is connected to an air pump through an air pipe. The installation and connection accessories of the air nozzles will not interfere with the rotation of the U-shaped material trough, ensuring stable delivery of the coating. The airflow avoids adhesion to the inner wall of the material trough, improves the magnetic separation efficiency of metal impurities, and the installation of the air nozzles does not interfere with the rotation of the material trough, ensuring smooth separation.

[0007] Furthermore, the filter plate is provided with baffles on both sides to prevent the coating from overflowing from both sides during grading, ensuring filtration integrity, avoiding coating loss and mixing, and improving the multi-stage filtration separation accuracy.

[0008] Furthermore, the filter box has a sliding groove on its side, and the movable chamber slides and matches the sliding groove, providing stable guidance for the sliding switching of the movable chamber, ensuring its smooth movement between the filter box and the cleaning box, and improving the operational stability of the equipment.

[0009] Furthermore, the cleaning chamber is equipped with drying pipes on both sides inside, which can dry the filter plates after cleaning, remove residual moisture, avoid affecting the quality of subsequent coatings, and accelerate the recovery of the filter plates, thereby improving the efficiency of equipment use.

[0010] Furthermore, the cleaning chamber is equipped with a number of fans corresponding to the filter plates to accelerate air circulation, improve the efficiency of cleaning wastewater discharge and drying effect, optimize the cleaning and drying process, and shorten equipment recovery time.

[0011] Furthermore, one side of the cleaning box is a ventilation surface with several ventilation holes. A dust filter is inserted and installed near the ventilation holes in the cleaning box to allow air circulation while preventing external dust from entering, avoiding contamination of the filter plate and cleaning medium, and ensuring cleanliness.

[0012] Furthermore, the feed inlet is equipped with an electrically controlled valve to achieve automated control of paint feeding, precisely adjust the flow rate, avoid excessive flow leading to blockage, and improve the automation level of the equipment.

[0013] Furthermore, the input ends of the two vertical pipes are connected to an electrically controlled three-way valve to achieve synchronous control and switching of water supply to the two cleaning tanks, simplifying the water supply pipeline control structure, reducing control complexity, ensuring synchronous operation of the two cleaning tanks, and improving overall efficiency.

[0014] Furthermore, the outlet and the secondary discharge port are oriented in opposite directions to achieve separate discharge of cleaning wastewater and graded impurities, avoiding secondary pollution caused by mixed flow, facilitating subsequent classification and recycling, and improving resource utilization.

[0015] The beneficial effects of this invention are as follows: This invention solves the problems of single filtration devices having limited filtration accuracy and being prone to clogging. The metal separation mechanism utilizes the reciprocating rotation of the U-shaped material trough and the magnetic attraction of the electromagnetic wire to achieve deep separation of metal impurities. Combined with the graded design of the multi-stage filter plates in the multi-stage filtration mechanism, the coating is filtered to gradually reduce the particle size, effectively improving the separation accuracy and efficiency of the coating. This solves the problems of disconnect between metal separation and grading, and insufficient grading filtration accuracy in the prior art. The cleaning mechanism of this invention uses a telescopic cylinder to drive the moving chamber to flexibly switch between the filter box and the cleaning box, realizing the linkage operation of filtration and cleaning. Combined with the high-pressure cleaning of the pipe, the hot drying of the drying pipe, and the accelerated ventilation of the fan, the filter plates can be quickly cleaned and dried online. This solves the problems of complex equipment maintenance and cumbersome cleaning process, significantly shortens the equipment maintenance time, and ensures the continuity of production. Attached Figure Description

[0016] The present invention can be further illustrated by the non-limiting embodiments given in the accompanying drawings; Figure 1 is a structural schematic diagram from one perspective of an embodiment of a filtration device for water-based coating production according to the present invention; Figure 2 is a structural schematic diagram from another perspective of an embodiment of a filtration device for water-based coating production according to the present invention; Figure 3 is a schematic diagram of the internal structure of an embodiment of a filtration device for water-based coating production according to the present invention; Figure 4 is a schematic diagram of the cross-sectional structure of the filter box of an embodiment of a filtration device for water-based coating production according to the present invention; Figure 5 is a schematic diagram of the transverse cross-sectional structure of the cleaning box and the filter box of an embodiment of a filtration device for water-based coating production according to the present invention; Figure 6 is a schematic diagram of the filtration device for water-based coating production according to the present invention. A schematic diagram of the cross-sectional structure of the cleaning tank in the example; the symbols of the main components are explained as follows: metal separation mechanism 1; multi-stage filtration mechanism 2; cleaning mechanism 3; separation box 11; inlet 12; metal impurity outlet 13; rotating shaft 14; motor 15; U-shaped material trough 16; electromagnetic wire 17; controllable switch 18; primary outlet 19; air nozzle 110; filter box 21; moving chamber 22; filter plate 23; partition 24; secondary outlet 25; side guard 26; chute 27; cleaning tank 31; pipe 32; water nozzle 321; vertical pipe 33; telescopic cylinder 34; water outlet 35; drying pipe 36; fan 37; air exchange hole 38; dust filter screen 39; electrically controlled three-way valve 40. Detailed Implementation

[0017] To enable those skilled in the art to better understand the present invention, the technical solution of the present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0018] As shown in Figures 1 to 6, a filtration device for water-based coating production according to the present invention includes a metal separation mechanism 1, a multi-stage filtration mechanism 2, and a cleaning mechanism 3. The metal separation mechanism 1 includes a separation box 11, which has an inlet 12 and a metal outlet 13. A rotating shaft 14 is rotatably mounted inside the separation box 11. A motor 15 is connected to the power end of the rotating shaft 14, and a U-shaped material trough 16 is fixedly connected to the other end of the rotating shaft 14. The U-shaped material trough 16 is inclined and reciprocates inside the separation box 11 around the rotating shaft 14, performing a tilting action. An electromagnetic wire 17 is installed at the bottom of the material trough 16. A controllable switch 18 is installed on the electromagnetic wire 17. Under the control of the controllable switch 18, the electromagnetic wire 17 causes the U-shaped material trough 16 to be magnetized or demagnetized as needed. The separation box 11 has a primary discharge port 19 at the output end of the U-shaped material trough 16. The multi-stage filtration mechanism 2 includes a filter box 21. A movable chamber 22 is slidably installed inside the filter box 21. Multiple filter plates 23 with different filter hole sizes are installed obliquely inside the movable chamber 22. The filter plates 23 are installed in order of decreasing filter hole size from top to bottom. The input end of the uppermost filter plate 23 is connected to... At the primary discharge port 19, two sets of mobile chambers 22 are installed side by side, with a partition 24 forming a common wall between the two sets of mobile chambers 22. The filter plates 23 on the two sets of mobile chambers 22 are installed in the same position. Each set of mobile chambers 22 has a U-shaped structure, with only its upper and lower ends and the corresponding discharge ends of the filter plates 23 being open, while the rest of the area is enclosed. The filter box 21 has a secondary discharge port 25 that connects to the discharge end of each filter plate 23. The cleaning mechanism 3 includes cleaning boxes 31 located on both sides of the filter box 21. The internal structure of the two cleaning boxes 31 is exactly the same, and several cleaning boxes 31 are installed inside. The quantity and position correspond to the pipes 32 of the filter plate 23. The output end of the pipes 32 is equipped with a water nozzle 321. The output end of the water nozzle 321 corresponds to the surface of the filter plate 23. All pipes 32 share a vertical pipe 33 as the input end. The vertical pipe 33 passes through the top of the cleaning box 31 and is connected to the water supply circuit. A telescopic cylinder 34 is fixedly installed on the outer wall of one of the cleaning boxes 31. The output end of the telescopic cylinder 34 is connected to the outer wall of the moving chamber 22. The telescopic cylinder 34 serves as the power for the moving chamber 22, enabling the moving chamber 22 to move and switch between the filter box 21 and the two cleaning boxes 31. The lower end of the cleaning box 31 is the water outlet 35.

[0019] In this embodiment, when using a filtration device for water-based coating production, the metal separation mechanism 1 is located at the front end of the device. The separation box 11 serves as the main body of the metal separation mechanism 1, with an inlet 12 on the left side and a metal impurity outlet 13 at the center of the bottom. A rotating shaft 14 is horizontally mounted inside the separation box 11. The power end of the rotating shaft 14 extends out from the left side of the separation box 11 and is connected to a motor 15. The other end of the rotating shaft 14 is fixedly connected to a U-shaped material trough 16. The U-shaped material trough 16 is installed in an inclined state inside the separation box 11. When the motor 15 drives the rotating shaft 14 to rotate, the U-shaped material trough 16 can reciprocate within the separation box 11 around the rotating shaft 14 as its axis. The coating conveying and pouring action involves an electromagnetic wire 17 wound around the bottom of the U-shaped trough 16. The electromagnetic wire 17 is connected to a controllable switch 18, which is installed on the outside of the separation box 11. The controllable switch 18 controls the on / off state of the electromagnetic wire 17, allowing the U-shaped trough 16 to be magnetic or non-magnetic as needed. The separation box 11 has a primary discharge port 19 at the output end of the U-shaped trough 16, from which the coating flows out after metal separation. The multi-stage filtration mechanism 2 is located to the right of the metal separation mechanism 1. The filter box 21 serves as the main body of the multi-stage filtration mechanism 2, with two sets of movable chambers 22 slidingly fitted on its internal side walls. The two sets of movable chambers 22 are arranged side by side. A partition 24 is formed between the shared walls of the two moving chambers 22. Each moving chamber 22 has a U-shaped structure, with only the top and bottom ends and the corresponding discharge ends of the filter plates 23 being open; the rest of the area is closed. Multiple filter plates 23 are installed obliquely inside the moving chamber 22, with the pore size decreasing from top to bottom. The input end of the uppermost filter plate 23 connects to the primary discharge port 19. The filter plates 23 on both moving chambers 22 are installed in the same position. A secondary discharge port 25 is opened inside the filter box 21, connecting to the discharge end of each filter plate 23. Classified impurities are discharged from the secondary discharge port 25. A cleaning mechanism 3 is located on both sides of the filter box 21. The internal structures of the two cleaning boxes 31 are completely identical. The number and position of the pipes 32 installed inside the cleaning tank 31 are all corresponding to those of the filter plate 23. Water nozzles 321 are installed at the output end of the pipes 32. The output end of the water nozzles 321 faces the surface of the filter plate 23. All pipes 32 share a vertical pipe 33 as the input end. The vertical pipe 33 passes through the top of the cleaning tank 31 and is connected to the water supply circuit. A telescopic cylinder 34 is fixedly installed on the outer wall of one of the cleaning tanks 31. The output end of the telescopic cylinder 34 is connected to the outer wall of the moving chamber 22. The telescopic cylinder 34 serves as the power source for the moving chamber 22 and can drive the moving chamber 22 to move and switch between the filter tank 21 and the two cleaning tanks 31. A water outlet 35 is provided at the lower end of the cleaning tank 31, and the cleaning wastewater is discharged from the water outlet 35.The coating to be processed enters the separation box 11 through the inlet 12 and falls into the inclined U-shaped trough 16. Under the inclination of the U-shaped trough 16 and its own weight, the coating moves towards the primary outlet 19. During the flow, the controllable switch 18 keeps the solenoid 17 energized, so the U-shaped trough 16 magnetically attracts metal impurities in the coating. After two hours of continuous operation or after the coating to be processed has been added, the solenoid 17 is de-energized. After de-energization, the U-shaped trough 16 is demagnetized, and the motor 15 drives the rotating shaft 14 to rotate, which in turn causes the U-shaped trough 16 to flip. The impurities remaining in the U-shaped trough 16 are discharged from the metal impurity outlet 13 under its own weight. The coating flows from the primary outlet 19 into the uppermost filter plate 23 and is filtered step by step on the inclined filter plate 23. After grading, large particles of impurities are discharged from the secondary outlet 25. The filtered coating has completed multi-stage grading, and different grades of coating can be treated accordingly. For example, the largest impurities can be crushed and de-floculated, while the smallest impurities can be directly reused. When the filter plate 23 needs cleaning, the filtered movable chamber 22 is moved to the corresponding cleaning box 31. This action is driven by the telescopic cylinder 34. After this action, the other movable chamber 22 is in the filter box 21, achieving uninterrupted filtration during cleaning. The water supply is supplied to the drain pipe 32 through the vertical pipe 33, and the water nozzle 321 sprays cleaning water onto the filter plate 23. The cleaning wastewater is discharged from the outlet 35. This device uses the rotating magnetic attraction design of the metal separation mechanism 1 to achieve active adsorption and tilting separation of metal impurities, avoiding the problem of difficult cleaning of impurities caused by the accumulation of impurities in traditional magnetic attraction devices. The two sets of movable chambers 22, together with the multi-stage filter plates 23, not only achieve graded filtration of coatings, but also complete online cleaning of the filter plates 23 through movement switching without stopping the machine for disassembly. The cleaning mechanism 3 is linked with the multi-stage filtration mechanism 2, and the two cleaning boxes 31 work alternately to ensure production continuity. The whole unit forms an integrated structure, improving the filtration efficiency of water-based coatings and the convenience of equipment maintenance.

[0020] The U-shaped material trough 16 is preferably inclined at 30 degrees. Several air nozzles 110 are installed on the upper side of the output end of the U-shaped material trough 16. The output end of the air nozzle 110 acts on the entire inner bottom surface of the U-shaped material trough 16. The input end of the air nozzle 110 is connected to an air pump through an air pipe. The installation and connection accessories of the air nozzle 110 will not interfere with the rotation of the U-shaped material trough 16.

[0021] In this embodiment, the U-shaped material trough 16 is installed at an angle inside the separation box 11. Several air nozzles 110 are installed on the inner wall of the separation box 11 above the output end. The output end of the air nozzles 110 covers the inner bottom surface of the U-shaped material trough 16, and the input end is connected to an air pump through an air pipe. The installation accessories avoid the rotation trajectory of the U-shaped material trough 16 and do not interfere with its reciprocating rotation. A flow regulating valve can be added to the air pipe of the air nozzle 110 to automatically adjust the purging airflow intensity according to the viscosity of the coating. At the same time, the purging timing of the air nozzle 110 is deeply bound to the on / off cycle of the electromagnetic wire 17. 7. During the energized adsorption stage, a weak airflow is used to purge impurities to avoid disturbing them. During the de-energized impurity removal stage of the electromagnetic wire 17, a strong airflow is used to purge impurities. A 30-degree tilt angle ensures stable coating delivery. The air nozzle 110 not only prevents adhesion to the inner wall of the material tank and improves the magnetic separation efficiency of metal impurities, but also assists in purging residues during the tumbling impurity removal stage. Combined with the extended design of flow rate regulation and cycle binding, the separation of metal impurities is further improved. Moreover, the air nozzle installation does not interfere with the rotation of the material tank, ensuring smooth separation. At the same time, the airflow purging improves the coating flow efficiency and ensures the continuous and stable operation of the entire process.

[0022] The filter plate 23 preferably has baffles 26 on both sides.

[0023] In this implementation, baffles 26 are integrally formed on both sides of the filter plate 23. The baffles 26 extend along the length of the filter plate 23 and are perpendicularly connected to the surface of the filter plate 23. After being installed inside the movable chamber 22, the baffles 26 are fitted and sealed to the inner wall of the movable chamber 22, forming a closed enclosure for the coating. A guide channel can be added to the inner side of the baffles 26 to guide impurities to flow along the length of the filter plate 23 to the secondary discharge port 25. At the same time, an elastic sealing strip is added at the joint between the baffles 26 and the movable chamber 22 to further improve the sealing performance of the enclosure and prevent the coating from overflowing from the gaps. This effectively prevents the coating from overflowing from both sides during grading, ensures the integrity of filtration, avoids coating loss and mixing, and improves the separation accuracy of multi-stage filtration. The extended design of the guide channel and the sealing strip further optimizes the directional flow of impurities, reduces coating retention, facilitates the discharge of subsequent cleaning wastewater, and the accurate grading effect provides a reliable material basis for subsequent targeted treatment.

[0024] The preferred filter box 21 has a sliding groove 27 on its side, and the movable chamber 22 slides and matches the sliding groove 27.

[0025] In this embodiment, symmetrical sliding grooves 27 are arranged on both inner walls of the filter box 21. The sliding grooves 27 extend along the length of the filter box 21. The outer wall of the moving chamber 22 is slidably installed in the sliding grooves 27. When the telescopic cylinder 34 drives the moving chamber 22 to perform the switching action of "filter box 21-cleaning box 31", the sliding grooves 27 provide stable linear guidance for the moving chamber 22. A self-lubricating wear-resistant layer can be added to the inner wall of the sliding grooves 27. At the same time, a position sensor is added to the outer wall of the moving chamber 22 to detect the sliding position of the moving chamber 22 in real time. When the moving chamber 22 reaches the designated position of the filter box 21 or the cleaning box 31, the limit lock is automatically triggered to prevent sliding deviation. This provides stable guidance for the sliding switching of the moving chamber, ensuring its smooth movement between the filter box and the cleaning box, improving the stability of equipment operation. The extended design of the self-lubricating layer and the position sensor reduces the friction between the moving chamber and the inner wall of the filter box, extending the service life of the equipment. At the same time, the precise position locking ensures the continuity of the alternating operation of the two chambers and supports the realization of uninterrupted filtration.

[0026] The preferred cleaning box 31 has drying tubes 36 installed on both sides inside.

[0027] In this implementation, drying pipes 36 are symmetrically installed on both sides of the inner sidewalls of the cleaning chamber 31. The drying pipes 36 are arranged along the height of the cleaning chamber 31, with the input end connected to a hot air supply pipeline. Several air outlets are evenly arranged on the outer surface. After the moving chamber 22 enters the cleaning chamber 31 and completes the water washing of the filter plates 23, the drying pipes 36 start spraying hot air. A temperature sensor can be added to the air outlet of the drying pipe 36 to detect the hot air temperature in real time. When the temperature exceeds a preset threshold, the hot air supply intensity is automatically reduced. At the same time, the operation of the drying pipe 36 is linked with the fan 37. During the drying stage, the fan 37 starts synchronously to accelerate air circulation. After cleaning, the filter plates can be dried to remove residual moisture and avoid affecting the quality of subsequent coatings. At the same time, it accelerates the recovery of the filter plates and improves the efficiency of equipment use. The extended design of the temperature sensor and fan linkage further optimizes the drying effect, avoids overheating damage to the filter plates, and the efficient drying effect ensures the rapid readiness of the backup chamber and supports the continuity of alternating operation of the two chambers.

[0028] The preferred cleaning tank 31 is equipped with a number of fans 37 corresponding to the number of filter plates 23.

[0029] In this implementation, several fans 37 are installed inside the cleaning chamber 31. The number of fans 37 corresponds to the number of filter plates 23 inside the cleaning chamber 31. They are installed on the inner wall of the cleaning chamber 31 and correspond to the position of each filter plate 23. The air outlet faces the surface of the filter plate 23. The filter plates 23 are activated during both the water washing and drying stages. A wind speed adjustment module can be added to the air outlet of the fans 37 to automatically adjust the wind speed according to the degree of contamination of the filter plates 23. When the contamination is severe, a high wind speed is used to accelerate the discharge of cleaning wastewater. During the drying stage, a low wind speed is used to enhance the contact efficiency between hot air and the filter plates 23. At the same time, a primary filter is added to the air inlet of the fans 37 to further filter the air entering the cleaning chamber 31. This accelerates air circulation, improves the efficiency of cleaning wastewater discharge and drying effect, optimizes the cleaning and drying process, and shortens the equipment recovery time. The extended design of the wind speed adjustment and the primary filter further improves the adaptability and cleanliness of the fans. At the same time, the fan ventilation can also ventilate and dry the inside of the cleaning chamber when not in operation, keeping the inside of the chamber clean.

[0030] The cleaning box 31 is preferably designed with one side as the ventilation side and has several ventilation holes 38. A dust filter 39 is inserted and installed in the cleaning box 31 near the ventilation holes 38.

[0031] In this implementation, one side wall of the cleaning chamber 31 is designated as an air exchange surface, with several air exchange holes 38 evenly spaced on the surface. These holes 38 penetrate the side wall of the cleaning chamber 31. A dust filter 39 is inserted and installed near the air exchange holes 38, covering all areas of the air exchange holes 38 and sealing tightly against the side wall. A differential pressure sensor can be added to the outside of the dust filter 39 to detect the pressure difference across the filter in real time. When the pressure difference exceeds a preset threshold, it automatically prompts for filter replacement. Simultaneously, an electric damper is installed inside the air exchange holes 38. During non-cleaning periods, the damper is closed to prevent external dust from entering the cleaning chamber 31. This achieves air circulation while preventing external dust from entering, avoiding contamination of the filter plates and cleaning media, and ensuring cleanliness. The extended design of the differential pressure sensor and electric damper further enhances the intelligence and reliability of dust prevention and ventilation, extends the service life of the filter plates and cleaning media, and reduces maintenance frequency.

[0032] An electric control valve is preferably installed at the feed inlet 12.

[0033] In this implementation case, an electrically controlled valve is installed on the pipeline at the inlet 12. The valve body is fixed to the pipeline at the inlet 12, and the control end is connected to the equipment control system. According to the cycle control logic of "running for two hours or the coating is completely added", the feed flow rate and timing are automatically adjusted. A flow sensor can be added to the output end of the electrically controlled valve to detect the coating feed flow rate in real time. When the flow rate exceeds the preset threshold, the opening of the electrically controlled valve is automatically reduced. At the same time, the operation of the electrically controlled valve is linked with the rotation cycle of the U-shaped material trough 16. During the impurity removal stage of the U-shaped material trough 16, the electrically controlled valve is automatically closed to prevent the coating from entering the separation box 11 during the impurity removal stage. This realizes automated control of coating feed, accurately adjusts the flow rate, avoids blockage caused by excessive flow, improves the automation level of the equipment, and the extended design of the flow sensor and cycle linkage further optimizes the accuracy of feed control, ensures the thorough separation of metal impurities, reduces manual operation costs, ensures stable feed flow rate, and improves overall filtration efficiency.

[0034] Preferably, the input ends of the two vertical pipes 33 are connected together to an electrically controlled three-way valve.

[0035] In this implementation, the input ends of the vertical pipes 33 of the two cleaning tanks 31 are connected to a single electrically controlled three-way valve. The three ports of the electrically controlled three-way valve are connected to the two vertical pipes 33 and the main water supply pipeline, respectively. The control end is connected to the equipment control system, and the water supply is switched according to the switching action of the two moving chambers 22. A pressure sensor can be added to the output end of the electrically controlled three-way valve to detect the water supply pressure in real time. When the pressure is insufficient, an alarm is automatically triggered. At the same time, the switching timing of the electrically controlled three-way valve is linked with the position sensor of the moving chamber 22. When the moving chamber 22 enters the cleaning tank 31, the water supply channel is automatically switched without manual intervention. This achieves synchronous control and switching of the water supply to the two cleaning tanks, simplifies the water supply pipeline control structure, reduces control complexity, ensures synchronous operation of the two cleaning tanks, and improves overall efficiency. The extended design of pressure sensor and position linkage further improves the reliability and automation of water supply control, reduces the number of electrically controlled valves used, and reduces equipment costs.

[0036] The output end of the preferred outlet 35 and the output end of the secondary outlet 25 are oriented in opposite directions.

[0037] In this implementation, the outlet 35 is located at the lower end of the cleaning tank 31, with its output end facing the lower outer side of the cleaning tank 31. The secondary discharge port 25 is located at the lower end of the filter box 21, with its output end facing the lower outer side of the filter box 21. The outlets 35 and 25 have opposite directions, completely separating the flow of cleaning wastewater and graded impurities. A small filter device can be added to the output end of the outlet 35 to perform preliminary filtration of the cleaning wastewater and recover fine paint particles. At the same time, a classification collection box can be added to the output end of the secondary discharge port 25 to classify and collect impurities of different particle sizes for subsequent targeted treatment. This achieves separate discharge of cleaning wastewater and graded impurities, avoiding secondary pollution caused by mixed flow, facilitating subsequent classification treatment and recycling, and improving resource utilization. The extended design of the small filter device and classification collection box further optimizes the efficiency of resource recycling and impurity treatment. Meanwhile, the opposite orientation reduces cross-interference of discharge channels and ensures smooth discharge.

[0038] The above embodiments are merely illustrative of the principles and effects of the present invention and are not intended to limit the invention. Any person skilled in the art can modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by those skilled in the art without departing from the spirit and technical concept disclosed in the present invention should still be covered by the claims of the present invention.

Claims

1. A filtration device for water-based coating production, characterized in that: The system includes a metal separation mechanism (1), a multi-stage filtration mechanism (2), and a cleaning mechanism (3). The metal separation mechanism (1) includes a separation box (11), which has an inlet (12) and a metal discharge outlet (13). A rotating shaft (14) is rotatably installed inside the separation box (11). A motor (15) is connected to the power end of the rotating shaft (14), and a U-shaped material trough (16) is fixedly connected to the other end of the rotating shaft (14). The U-shaped material trough (16) is inclined and rotates back and forth inside the separation box (11) around the rotating shaft (14) to perform a tilting action. An electromagnetic wire (17) is installed on the bottom of the U-shaped material trough (16). (17) A controllable switch (18) is installed. Under the control of the controllable switch (18), the electromagnetic wire (17) makes the U-shaped material trough (16) magnetic or non-magnetic as needed. The separation box (11) is provided with a primary discharge port (19) at the output end of the U-shaped material trough (16). The multi-stage filtration mechanism (2) includes a filter box (21). A movable chamber (22) is slidably installed inside the filter box (21). Multiple filter plates (23) with different filter hole sizes are installed obliquely inside the movable chamber (22). The filter plates (23) are installed in a manner from large to small filter hole size from top to bottom. The input end of the filter plate (23) located on the uppermost side is connected to the primary discharge port (19). The movable chamber (22) Two sets are installed side by side, with a partition (24) forming a common wall between the two sets of mobile chambers (22). The filter plates (23) on the two sets of mobile chambers (22) are installed in the same position. Each set of mobile chambers (22) has a U-shaped structure, with only its upper and lower ends and the corresponding discharge ends of the filter plates (23) being open, while the rest of the area is closed. The filter box (21) is provided with a secondary discharge port (25) that connects to the discharge end of each filter plate (23). The cleaning mechanism (3) includes cleaning boxes (31) located on both sides of the filter box (21). The internal structure of the two cleaning boxes (31) is exactly the same. The cleaning box (31) is equipped with a number and position of pipes (32) corresponding to the filter plates (23). The output end of the pipe (32) is provided with a water nozzle (321), the output end of the water nozzle (321) corresponds to the surface of the filter plate (23), all the pipes (32) share a vertical pipe (33) as the input end, the vertical pipe (33) passes through the top of the cleaning box (31) and connects to the water supply circuit, one of the cleaning boxes (31) has a telescopic cylinder (34) fixedly installed on the outer wall, the output end of the telescopic cylinder (34) is connected to the outer wall of the moving chamber (22), the telescopic cylinder (34) serves as the power for the moving chamber (22), so that the moving chamber (22) moves and switches between the filter box (21) and the two cleaning boxes (31), the lower end of the cleaning box (31) is the water outlet (35).

2. The filtration device for water-based coating production according to claim 1, characterized in that: The U-shaped material trough (16) has an inclination of 30 degrees. Several air nozzles (110) are installed on the upper side of the output end of the U-shaped material trough (16). The output end of the air nozzle (110) acts on the entire inner bottom surface of the U-shaped material trough (16). The input end of the air nozzle (110) is connected to an air pump through an air pipe. The installation and connection accessories of the air nozzle (110) will not interfere with the rotation of the U-shaped material trough (16).

3. The filtration device for water-based coating production according to claim 1, characterized in that: The filter plate (23) is provided with baffles (26) on both sides.

4. A filtration device for water-based coating production according to claim 1, characterized in that: The filter box (21) is provided with a sliding groove (27) on its side, and the movable chamber (22) slides and matches the sliding groove (27).

5. A filtration device for water-based coating production according to claim 1, characterized in that: Drying tubes (36) are installed on both sides inside the cleaning box (31).

6. A filtration device for water-based coating production according to claim 1, characterized in that: The cleaning tank (31) is equipped with a number of fans (37) corresponding to the number of filter plates (23).

7. A filtration device for water-based coating production according to claim 1, characterized in that: One side of the cleaning box (31) is the ventilation surface, and it is provided with a number of ventilation holes (38). A dust filter (39) is inserted and installed in the cleaning box (31) near the ventilation holes (38).

8. A filtration device for water-based coating production according to claim 1, characterized in that: An electrically controlled valve is installed at the feed inlet (12).

9. A filtration device for water-based coating production according to claim 1, characterized in that: The input ends of the two vertical pipes (33) are connected together to an electrically controlled three-way valve.

10. A filtration device for producing water-based coatings according to claim 1, characterized in that: The output end of the outlet (35) and the output end of the secondary outlet (25) are oriented in opposite directions.

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