Automatic coating liquid backflow and collection device
By employing a multi-stage filtration system and activated carbon adsorption technology, the problems of coating liquid waste and pollution have been solved, achieving efficient recovery and purification, reducing costs, and ensuring coating quality.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- 广东华柔纸业有限公司
- Filing Date
- 2024-11-29
- Publication Date
- 2026-04-28
AI Technical Summary
Existing coating solutions have complex compositions, contain expensive chemical raw materials, resulting in significant waste. Volatile organic compounds pollute the environment, increase production costs, and exacerbate air pollution.
Design an automatic reflux collection device for coating liquid, which adopts a multi-stage filtration system, including ceramic fiber, primary filter plate, secondary filter plate made of stainless steel and tertiary filter plate made of aluminum plate, combined with activated carbon, ceramic micropores and ion exchange resin layer to achieve multi-stage fine filtration, adsorb volatile organic compounds and remove impurities and metal ions.
It achieves efficient recovery and purification of coating liquid, reduces waste, lowers production costs, improves the working environment, ensures coating quality, and avoids pollution.
Smart Images
Figure CN224167098U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the technical field of coating liquid, and in particular to an automatic reflux collection device for coating liquid. Background Technology
[0002] A coating solution is a liquid material used for coating various material surfaces. It is typically a mixture of multiple components, including but not limited to solvents, solutes, binders, pigments, and additives. The solvent acts as a carrier, dissolving the other components and giving the coating solution suitable fluidity for uniform coating onto the material surface. The solute may be a substance providing a specific function; for example, in the electronics industry, the solute might be a conductive material used to manufacture conductive coatings. The binder's role is to ensure the coating solution adheres firmly to the surface of the coated material after drying or curing. For instance, in paper coating, the binder binds pigments and other components to the surface. Paper fibers are tightly bonded together, and pigments are mainly used to give the coating color to meet aesthetic or labeling requirements. Additives can be added according to specific applications. For example, preservatives can prevent the coating liquid from deteriorating during storage, and leveling agents can make the coated surface smoother. From a physical state perspective, the coating liquid can be a solution, emulsion, or suspension. A solution is a state in which the solute is completely dissolved in a solvent; an emulsion is a system in which a liquid is dispersed in the form of tiny droplets in another immiscible liquid; and a suspension is a state in which solid particles are dispersed in a liquid. In order to recycle and reuse resources, an automatic return and collection device for coating liquid is particularly needed.
[0003] However, existing coating solutions are usually quite complex in composition, containing a variety of expensive chemical raw materials. In some high-end electronic products, the coating solutions contain high-purity metal compounds and special polymers. These raw materials are extremely expensive. If the coating solution is not recycled, the unused portion during each coating process will be wasted, which will undoubtedly increase production costs significantly. At the same time, some volatile organic compounds in the coating solution will volatilize when exposed to air. These will participate in photochemical reactions and produce harmful pollutants such as ozone and peroxyacetyl nitrate, exacerbating air pollution phenomena such as smog and photochemical smog. Utility Model Content
[0004] The purpose of this invention is to provide an automatic coating liquid return and collection device to solve the problem of the existing automatic coating liquid return and collection device mentioned in the background art. However, the composition of existing coating liquids is usually quite complex, containing a variety of expensive chemical raw materials. In some high-end electronic products, the coating liquid contains high-purity metal compounds, special polymers, etc., which are extremely expensive. If the coating liquid is not recycled, the unused portion in each coating process will be wasted, which will undoubtedly increase production costs significantly. At the same time, some volatile organic compounds in the coating liquid will volatilize when exposed to air. These will participate in photochemical reactions and produce harmful pollutants such as ozone and peroxyacetyl nitrate, exacerbating the problem of air pollution such as smog and photochemical smog.
[0005] To achieve the above objectives, this utility model provides the following technical solution: an automatic reflux collection device for coating liquid, comprising a base frame, universal wheels installed at the bottom of the base frame, a top frame fixedly connected to the upper surface of the base frame, a container rack connected to the upper surface of the base frame, support feet fixedly connected to the bottom of the container rack, a reflux box fixedly connected to the upper surface of the top frame, a sealing cover fixedly connected to the upper surface of the reflux box, an injection port provided in the middle of the sealing cover, sealing gaskets fixedly connected to the surfaces of the reflux box and the sealing cover, a primary filter plate connected inside the reflux box, a secondary filter plate connected inside the reflux box, a tertiary filter plate connected inside the reflux box, and an overflow filtration mechanism provided at the bottom of the reflux box, the overflow filtration mechanism comprising an overflow device and a filtration device.
[0006] Preferably, the overflow device includes an overflow pipe, a self-priming pump, a connection port, and a container bottle. The bottom of the return box is fixedly connected to the overflow pipe, the surface of the overflow pipe is provided with a self-priming pump, the inside of the overflow pipe is connected to the connection port, the bottom of the connection port is fixedly connected to the container bottle, and the filter device is disposed inside the connection port.
[0007] Preferably, the filtration device includes a first filter layer, a second filter layer, and a third filter layer. The first filter layer is disposed inside the connection port, the second filter layer is disposed on the bottom surface of the first filter layer, and the third filter layer is disposed on the bottom surface of the second filter layer.
[0008] Preferably, multiple sets of the casters are provided at the bottom of the base frame, and are symmetrically arranged at the four corners of the base frame with respect to the central axis of the base frame.
[0009] Preferably, the primary filter plate is made of ceramic fiber, the secondary filter plate is made of stainless steel, and the tertiary filter plate is made of aluminum.
[0010] Preferably, the pore sizes of the primary filter plate, secondary filter plate, and tertiary filter plate decrease sequentially, with the pore size of the primary filter plate being 0.5-1 mm, the pore size of the secondary filter plate being 0.1-0.5 mm, and the pore size of the tertiary filter plate being less than 0.1 mm.
[0011] Preferably, the first filter layer is an activated carbon filter layer, the second filter layer is a ceramic microporous filter layer, and the third filter layer is an ion exchange resin layer.
[0012] Preferably, the outer wall of the connection port is provided with an elastic sealing ring, the outer wall of the elastic sealing ring is tightly fitted with the bottom inner wall of the overflow pipe (13), and the inner wall surface of the connection port is provided with an annular groove, and the first filter layer, the second filter layer and the third filter layer are all embedded in the annular groove and tightly fitted.
[0013] Compared with the prior art, the beneficial effects of this utility model are as follows: This automatic coating liquid return and collection device, firstly, after the coating operation begins, excess coating liquid flows to the injection port of this automatic return and collection device through a corresponding return pipe or collection device. Because the sealing cap and the return box are sealed by multiple sets of sealing gaskets distributed at the four corners, the coating liquid will not leak from the gaps, and outside air cannot enter. After the coating liquid enters the return box from the injection port, it first contacts the primary filter plate. The primary filter plate is made of ceramic fiber material, and its 0.5-1mm pore size can intercept... Large particles such as dust and large paint agglomerates are removed. Furthermore, the ceramic fiber material remains undeformed and undamaged when exposed to heat generated by friction during the coating liquid's reflux, ensuring a stable and reliable filtration process. After initial filtration by the primary filter plate, the coating liquid continues to the secondary filter plate. The stainless steel secondary filter plate possesses high mechanical strength, capable of withstanding pressure differences and occasional liquid impacts during filtration. Its 0.1-0.5mm pore size further filters out medium-sized particles, maintaining structural integrity and stable filtration performance. Subsequently, the coating liquid... The coating solution reaches the three-stage filter plate. Made of lightweight aluminum, the three-stage filter plate facilitates the movement and operation of the entire device. It is also easy to process to meet the precision requirement of a pore size of less than 0.1mm, effectively removing fine particles and further improving the purity of the coating solution. This three-stage filter plate design, with progressively decreasing pore sizes, achieves multi-stage fine filtration, not only improving filtration efficiency and reducing the risk of clogging on a single filter plate, but also extending the service life of the filter plates and reducing maintenance costs. After three-stage filtration in the return box, the coating solution flows out through the overflow pipe at the bottom. The surface of the overflow pipe... The installed self-priming pump adjusts its power according to the actual situation. If the coating liquid flow rate is high, the self-priming pump automatically increases its power; conversely, it decreases its power, thus ensuring that the coating liquid flows towards the connection port at a stable speed. When the coating liquid reaches the connection port, it first passes through the first filter layer. Since the coating liquid may contain volatile organic compounds and other components that can pollute the environment and affect its own quality, the rich pore structure of activated carbon can adsorb these volatile organic compounds, reduce odor, improve the working environment, and prevent the coating liquid from deteriorating due to the accumulation of volatiles. Then, the coating liquid passes through the second filter layer, which has a viscosity of 0.05-0.The 1mm micropore size can intercept abrasive particles or incompletely adsorbed micro-impurities generated by the activated carbon layer, further improving filtration accuracy and ensuring the purity of the coating solution. Finally, the coating solution passes through a third filtration layer, which removes metal ions that may be present in the coating solution from raw materials or production process contaminants. This prevents these ions from adversely affecting the coating quality during coating, such as causing spots or affecting the conductivity of conductive coatings, thus further improving the purity of the coating solution. After this series of filtrations, the pure coating solution finally flows into a container bottle for collection and storage. The entire process achieves efficient recovery and purification of complex-component coating solutions, avoiding waste and environmental pollution, effectively reducing production costs, and ensuring the quality of subsequent coating operations. When the device needs to be moved, the symmetrically arranged casters at the four corners of the base frame can easily move the device to a suitable location, while multiple symmetrical support feet at the bottom of the container frame ensure the stability of the container bottle during collection. Attached Figure Description
[0014] Figure 1 This is a front view structural diagram of the present utility model;
[0015] Figure 2 This is a side view of the structure of the present utility model;
[0016] Figure 3 This is a schematic diagram of the cross-sectional structure of the present utility model;
[0017] Figure 4 This is a schematic diagram of the connection port and container bottle of this utility model in mutual cooperation.
[0018] Figure 5 This is a schematic diagram of the structure of the first filter layer, the second filter layer, and the third filter layer of this utility model in cooperation with each other.
[0019] In the diagram: 1. Base frame; 2. Casters; 3. Top frame; 4. Container rack; 5. Support legs; 6. Return box; 7. Sealing cap; 8. Injection port; 9. Sealing gasket; 10. Primary filter plate; 11. Secondary filter plate; 12. Tertiary filter plate; 13. Overflow filtration mechanism; 1301. Overflow pipe; 1302. Self-priming pump; 1303. Connection port; 1304. Container bottle; 1305. First filter layer; 1306. Second filter layer; 1307. Third filter layer. Detailed Implementation
[0020] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.
[0021] Please see Figures 1-5 This utility model provides a technical solution: an automatic return and collection device for coating liquid, including a base frame 1, universal wheels 2 installed at the bottom of the base frame 1, a top frame 3 fixedly connected to the upper surface of the base frame 1, a container rack 4 connected to the upper surface of the base frame 1, support feet 5 fixedly connected to the bottom of the container rack 4, a return box 6 fixedly connected to the upper surface of the top frame 3, a sealing cover 7 fixedly connected to the upper surface of the return box 6, an injection port 8 provided in the middle of the sealing cover 7, sealing gaskets 9 fixedly connected to the surfaces of the return box 6 and the sealing cover 7, a primary filter plate 10 connected inside the return box 6, a secondary filter plate 11 connected inside the return box 6, a tertiary filter plate 12 connected inside the return box 6, and an overflow filtration mechanism 13 provided at the bottom of the return box 6. The overflow filtration mechanism 13 includes an overflow device and a filtration device, and the filtration device filters the coating liquid overflowing from the overflow device.
[0022] Furthermore, the overflow device includes an overflow pipe 1301, a self-priming pump 1302, a connection port 1303, and a container bottle 1304. The overflow pipe 1301 is fixedly connected to the bottom of the return tank 6. The self-priming pump 1302 is installed on the surface of the overflow pipe 1301. The connection port 1303 is connected inside the overflow pipe 1301. The container bottle 1304 is fixedly connected to the bottom of the connection port 1303. A filter device is installed inside the connection port 1303. Through the overflow device 1301, when the coating liquid level in the return tank 6 reaches a certain height, the overflow process is initiated. First, the self-priming pump 1302 located on the overflow pipe 1301 starts working, providing power for the entire overflow process. Under the action of the self-priming pump 1302, the coating liquid flows within the overflow pipe 1301. Then, the coating liquid flows through the connection port 1303 inside the overflow pipe 1301. The container bottle 1304 flowing to the bottom has a filter device inside the connection port 1303. When the coating liquid passes through the connection port 1303, the impurities in it are intercepted by the filter device, which achieves preliminary filtration of the overflow coating liquid. This ensures that the coating liquid flowing into the container bottle 1304 is relatively pure, reduces impurities, and facilitates further processing or reuse of these coating liquids. This improves the working efficiency of the entire automatic coating liquid return collection device and the quality of the collected liquid.
[0023] Furthermore, the filtration device includes a first filter layer 1305, a second filter layer 1306, and a third filter layer 1307. The first filter layer 1305 is disposed inside the connection port 1303, the second filter layer 1306 is disposed on the bottom surface of the first filter layer 1305, and the third filter layer 1307 is disposed on the bottom surface of the second filter layer 1306. Through this filtration device, when the coating liquid flows through the connection port 1303 under the action of the self-priming pump 1302, it first contacts the first filter layer 1305. The first filter layer 1305 has a larger pore size, which can intercept larger particles of impurities in the coating liquid, such as potentially large dust particles or large agglomerates, thus performing preliminary coarse filtration of the coating liquid. The coating liquid filtered by the first filter layer 1305 continues to flow downwards to reach the second filter layer 1306. The pore size of the second filter layer 1306 is larger than that of the first filter layer 1305. The small pore size allows it to further intercept medium-sized impurities, such as smaller agglomerates or incompletely dissolved particles, further improving the purity of the coating solution. Subsequently, the coating solution flows to the third filter layer 1307, which has an even smaller pore size and can effectively remove tiny impurities, such as any fine particles or impurity ions, so that the coating solution that finally flows into the container bottle 1304 achieves a high purity, meeting the quality requirements of subsequent production processes and ensuring the stability of the coating process and product quality.
[0024] Furthermore, multiple sets of casters 2 are installed at the bottom of the base frame 1, symmetrically arranged at the four corners of the base frame 1 along its central axis. The even distribution of these casters at the four corners ensures uniform force distribution on the entire device during placement, allowing it to be placed stably on the ground and preventing it from tipping over due to instability. When the device needs to be moved, operators can easily push it from all directions without lifting it, greatly improving its mobility and ease of use. For example, transferring the device between different coating work areas can be done quickly and conveniently, saving manpower and time. The symmetrically arranged casters 2 facilitate precise control of the device's direction and position, enabling it to move accurately to the required location, such as a suitable position near the coating equipment for coating liquid recovery. Moreover, during movement, it can flexibly navigate around obstacles, ensuring the device reaches its destination smoothly.
[0025] Furthermore, the primary filter plate 10 is made of ceramic fiber, the secondary filter plate 11 is made of stainless steel, and the tertiary filter plate 12 is made of aluminum. Through the arrangement of the primary filter plate 10, secondary filter plate 11, and tertiary filter plate 12, the primary filter plate 10, made of ceramic fiber, exhibits good high-temperature resistance. During the coating liquid reflux process, a certain amount of heat may be generated due to friction or other factors. The ceramic fiber primary filter plate 10 can withstand high temperatures without deforming or being damaged, ensuring the stability and reliability of the filtration process. The secondary filter plate 11, made of stainless steel, possesses high mechanical properties. The stainless steel secondary filter plate 11 is strong enough to withstand certain pressure and impact, and is not easily damaged during long-term use. During the filtration of the coating liquid, there may be a certain pressure difference or occasional liquid impact. The stainless steel secondary filter plate 11 can maintain its structural integrity and ensure stable filtration performance. The tertiary filter plate 12 is made of aluminum plate. Aluminum plate is relatively light, which is beneficial to the structural design of the entire device. It can reduce the weight of the device and facilitate movement and operation. At the same time, aluminum plate is easy to process into the required shape and precision, which can meet the processing requirements of the tertiary filter plate 12 for fine requirements such as filter pore size, and ensure the consistency of its filtration effect.
[0026] Furthermore, the pore sizes of the primary filter plate 10, secondary filter plate 11, and tertiary filter plate 12 decrease sequentially. The pore size of the primary filter plate 10 is 0.5-1 mm, the pore size of the secondary filter plate 11 is 0.1-0.5 mm, and the pore size of the tertiary filter plate 12 is less than 0.1 mm. Through the arrangement of the primary filter plate 10, secondary filter plate 11, and tertiary filter plate 12, multi-stage fine filtration is achieved. The progressively decreasing pore size design allows for graded filtration of the coating liquid. Firstly, the primary filter plate 10, with its larger pore size, can effectively intercept large particulate impurities in the coating liquid, such as dust and large paint agglomerates, thus initially preventing filtration. The coating solution is purified, and then the secondary filter plate 11 further filters out medium-sized particles, while the tertiary filter plate 12 is responsible for removing fine particles, ensuring that the coating solution entering the overflow pipe 13 has a high purity, meeting the requirements for subsequent use or treatment, improving filtration efficiency and extending the life of the filter plates. This staged filtration method avoids filtering all impurities on a single filter plate, reducing the filtration burden on a single filter plate. Large particles of impurities are intercepted at the primary filter plate 10 and will not cause blockage to the subsequent finer secondary and tertiary filter plates, thereby improving the filtration efficiency of the entire filtration system, while also extending the service life of each stage of filter plates and reducing maintenance costs.
[0027] Furthermore, the first filter layer 1305 is an activated carbon filter layer, the second filter layer 1306 is a ceramic microporous filter layer, and the third filter layer 1307 is an ion exchange resin layer. Through the arrangement of the first filter layer 1305, the second filter layer 1306, and the third filter layer 1307, the first filter layer 1305, being an activated carbon filter layer, adsorbs volatile organic compounds and odors. The coating solution may contain some volatile organic compounds, which not only pollute the working environment and produce a pungent odor but may also affect the quality of the coating solution. Activated carbon, with its rich porous structure, can effectively adsorb these volatile organic compounds, reduce the odor of the coating solution, improve the working environment, and also help prevent the coating solution from deteriorating due to the accumulation of volatiles. The second filter layer 1306, being a ceramic microporous filter layer, precisely intercepts tiny particles. The micropores of the layer have a diameter of 0.05-0.1 mm, which can effectively intercept tiny particles that may remain after passing through the activated carbon layer. These particles may be particles generated by the wear of the activated carbon itself or tiny impurities that have not been completely adsorbed in the coating liquid. The ceramic microporous filter layer ensures that these particles will not enter the subsequent filter layer or coating liquid, further improving the filtration accuracy of the coating liquid. The third filter layer 1307 is an ion exchange resin layer, which removes impurities such as metal ions. The coating liquid may contain some metal ions, which may come from the raw materials or contamination in the production process. The ion exchange resin layer can remove these metal ions through ion exchange reaction, preventing them from having an adverse effect on the coating quality during the coating process, such as causing spots on the coating or reducing the conductivity of the coating, and further improving the purity of the coating liquid.
[0028] Working principle: Firstly, after the coating operation begins, excess coating liquid flows through the corresponding return pipe or collection device to the injection port 8 of this automatic return collection device. Because the sealing cap 7 and the return box 6 are sealed by multiple sets of sealing gaskets 9 distributed at the four corners, the coating liquid will not leak from the gaps, and outside air cannot enter. After the coating liquid enters the return box 6 from the injection port 8, it first comes into contact with the primary filter plate 10. The primary filter plate 10 is made of ceramic fiber material, and its 0.5-1mm pore size can intercept large particulate impurities such as dust and large paint agglomerates. Furthermore, it effectively filters impurities on the surface. When the coating liquid is recirculated, the ceramic fiber material ensures that it does not deform or break due to the heat generated by friction, thus ensuring a stable and reliable filtration process. After preliminary filtration by the primary filter plate 10, the coating liquid continues to flow to the secondary filter plate 11. The stainless steel material of the secondary filter plate 11 has high mechanical strength and can withstand the pressure difference and occasional liquid impact during the filtration process. Its 0.1-0.5mm pore size can further filter out medium-sized particles, ensuring its structural integrity and stable filtration performance. Subsequently, the coating liquid reaches the tertiary filter plate 12, which is made of aluminum plate. The filter plate 12 is lightweight, facilitating the movement and operation of the entire device. It is also easily manufactured to meet the precision requirements of a filtration pore size of less than 0.1 mm, effectively removing fine particles and further improving the purity of the coating liquid. This three-stage filter plate design with progressively decreasing pore sizes achieves multi-stage fine filtration, not only improving filtration efficiency and reducing the risk of clogging on a single filter plate, but also extending the service life of the filter plates and reducing maintenance costs. The coating liquid, after three-stage filtration in the return box 6, flows out through the overflow pipe 13 at the bottom. The self-priming pump 14 installed on the surface of the overflow pipe 13 will automatically pump according to actual flow conditions. The power is adjusted according to the situation. If the coating liquid flow rate is high, the self-priming pump 14 automatically increases the power, and vice versa, thereby ensuring that the coating liquid flows to the connection port 15 at a stable speed. When the coating liquid reaches the connection port 15, it first passes through the first filter layer 1305. Since the coating liquid may contain volatile organic compounds and other components that may pollute the environment and affect its own quality, the rich pore structure of activated carbon can adsorb these volatile organic compounds, reduce odor, improve the working environment, and prevent the coating liquid from deteriorating due to the accumulation of volatiles. Then, the coating liquid passes through the second filter layer 1306, which has a viscosity of 0.05-0.The 1mm micropore size can intercept abrasive particles or incompletely adsorbed micro-impurities generated by the activated carbon layer, further improving filtration accuracy and ensuring the purity of the coating solution. Finally, the coating solution passes through a third filtration layer 1307, which removes metal ions that may be present in the coating solution from raw materials or production process contaminants, preventing these ions from adversely affecting coating quality during coating, such as causing spots or affecting the conductivity of conductive coatings. This further improves the purity of the coating solution. After this series of filtrations, the pure coating solution finally flows into container bottle 16 for collection and storage. The entire process achieves efficient recovery and purification of complex-component coating solutions, avoiding waste and environmental pollution, effectively reducing production costs, and ensuring the quality of subsequent coating operations. When the device needs to be moved, the symmetrically arranged casters 2 at the four corners of the base frame 1 can easily move the device to a suitable position, while the multiple symmetrical support feet 5 at the bottom of the container frame 4 ensure the stability of container bottle 16 during collection. This completes the operation of an automatic coating solution return collection device.
[0029] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.
Claims
1. An automatic return and collection device for coating liquid, comprising a base frame (1), characterized in that: The bottom of the base frame (1) is equipped with casters (2), the top frame (3) is fixedly connected to the upper surface of the base frame (1), the container rack (4) is connected to the upper surface of the base frame (1), the bottom of the container rack (4) is fixedly connected with support feet (5), the upper surface of the top frame (3) is fixedly connected with a reflux box (6), the upper surface of the reflux box (6) is fixedly connected with a sealing cover (7), the middle of the sealing cover (7) is provided with a liquid injection port (8), the surfaces of the reflux box (6) and the sealing cover (7) are both fixedly connected with sealing gaskets (9), the inside of the reflux box (6) is connected with a primary filter plate (10), the inside of the reflux box (6) is connected with a secondary filter plate (11), the inside of the reflux box (6) is connected with a tertiary filter plate (12), and the bottom of the reflux box (6) is provided with an overflow filtration mechanism (13). The overflow filtration mechanism (13) includes an overflow device and a filtration device, wherein the filtration device filters the coating liquid overflowing from the overflow device.
2. The automatic reflux collection device for coating liquid according to claim 1, characterized in that: The overflow device includes an overflow pipe (1301), a self-priming pump (1302), a connection port (1303), and a container bottle (1304). The bottom of the return box (6) is fixedly connected to the overflow pipe (1301). The surface of the overflow pipe (1301) is provided with the self-priming pump (1302). The inside of the overflow pipe (1301) is connected to the connection port (1303). The bottom of the connection port (1303) is fixedly connected to the container bottle (1304). The filter device is located inside the connection port (1303).
3. The automatic reflux collection device for coating liquid according to claim 2, characterized in that: The filtration device includes a first filter layer (1305), a second filter layer (1306), and a third filter layer (1307). The first filter layer (1305) is disposed inside the connection port (1303), the second filter layer (1306) is disposed on the bottom surface of the first filter layer (1305), and the third filter layer (1307) is disposed on the bottom surface of the second filter layer (1306).
4. The automatic reflux collection device for coating liquid according to claim 1, characterized in that: The casters (2) are provided in multiple sets at the bottom of the base frame (1) and are symmetrically arranged at the four corners of the base frame (1) with respect to the central axis of the base frame (1).
5. The automatic reflux collection device for coating liquid according to claim 1, characterized in that: The primary filter plate (10) is made of ceramic fiber, the secondary filter plate (11) is made of stainless steel, and the tertiary filter plate (12) is made of aluminum plate.
6. The automatic reflux collection device for coating liquid according to claim 1, characterized in that: The pore sizes of the primary filter plate (10), secondary filter plate (11) and tertiary filter plate (12) decrease sequentially, with the pore size of the primary filter plate (10) being 0.5-1 mm, the pore size of the secondary filter plate (11) being 0.1-0.5 mm, and the pore size of the tertiary filter plate (12) being less than 0.1 mm.
7. The automatic reflux collection device for coating liquid according to claim 3, characterized in that: The first filter layer (1305) is an activated carbon filter layer, the second filter layer (1306) is a ceramic microporous filter layer, and the third filter layer (1307) is an ion exchange resin layer.