Electrophoretic coating production device and production process

Abstract

The electrophoretic coating production device comprises an electrophoretic coating pool and is characterized in that a box body is arranged on one side of the electrophoretic coating pool, the box body comprises a recycling tank and a mixing tank, the recycling tank is used for recycling tank liquid obtained after electrophoresis is completed, the mixing tank is used for processing and reusing the tank liquid in the recycling tank, and the recycling tank is used for recycling the tank liquid in the mixing tank. A second flow guide pipe is connected between the recovery tank and the mixing tank; detecting the concentration of coating particles in the tank liquid under different electric conductivities, enabling the filtered tank liquid to enter a recovery tank, discharging at one end, close to the recovery tank, of a second flow guide pipe with the discharge capacity of a, and detecting the electric charge of the tank liquid at the other end of the second flow guide pipe as b, calculating the conductivity of the bath solution as # imgabs0 #, extracting and detecting the coating particle concentration C of the bath solution sample in the recovery tank at the moment, and drawing a first spline curve according to different coating particle concentrations in the bath solution and the corresponding conductivity; the problem that a traditional electrophoresis device cannot adjust electrophoresis coating parameters is solved.

Description

Technical Field

[0001] The invention relates to the technical field of electrophoretic coating, and in particular to an electrophoretic coating production device and a production process. Background Art

[0002] As an efficient and environmentally friendly surface coating method, electrophoretic coating technology has been widely used in modern industrial production. Especially in the coating process of complex-shaped workpieces such as metal castings, electrophoretic coating technology has shown unique advantages. However, the stability of the electrophoretic coating process and the coating quality are affected by many factors, among which the stability of the bath and the concentration control of the coating particles are particularly critical.

[0003] In the traditional electrophoretic coating process, the stability of the bath liquid and the concentration of the paint particles are usually controlled by manual experience and regular testing. This method is not only inefficient, but also difficult to ensure the stability and consistency of the coating quality. Therefore, an electrophoretic coating production device and production process are designed to solve the problem of being unable to control the concentration of impurity ions in the bath liquid and low electrophoresis efficiency. Summary of the invention

[0004] The purpose of the present invention is to provide an electrophoretic coating production device and a production process to solve the problems raised in the above background technology.

[0005] In order to solve the above technical problems, the present invention provides the following technical solution: a box is provided on one side of the electrophoretic coating pool, and the box includes a recovery tank and a mixing tank;

[0006] The concentration detection method is as follows:

[0007] S1: The filtered tank liquid enters the recovery tank, and the tank liquid is discharged at one end during the process of entering the mixing tank from the recovery tank, and the discharge amount is a. The charge of the tank liquid at the other end during the process of entering the mixing tank from the recovery tank is b. At this time, the conductivity of the tank liquid is d, and

[0008] S2: extracting a bath sample from the recovery tank, detecting the concentration of coating particles in the bath solution as C, and observing the electrophoretic coating effect of the metal casting at the current concentration;

[0009] S3: Draw a spline curve by detecting different concentrations of coating particles in the bath and their corresponding conductivity, draw a spline curve by detecting different concentrations of coating particles in the bath and the corresponding coating effects of metal castings, and determine when the coating particle concentration is C 1 Time slot liquid coating works best;

[0010] S4: Detect the conductivity of the bath liquid with the same paint particle concentration at different temperatures. When the paint particle concentration of the bath liquid is C 1When the temperature of the bath liquid is adjusted by the heating device, the temperature w with the highest conductivity is measured and found;

[0011] S5: During the operation, the operating temperature is maintained at w, and the conductivity of the tank liquid is calculated by the receiving guide block and the detector to obtain the concentration of the coating particles in the tank liquid in the recovery tank at this time;

[0012] If the actual concentration of coating particles in the bath is C 2 When the volume of the existing tank liquid in the mixing tank is L, the specific amount of the coating particles or solvent input into the mixing tank is L|C 1 -C 2 |.

[0013] According to the above technical solution, during the electrophoretic coating of metal castings, the tank liquid is introduced into the recovery tank, and the excess impurities are filtered out of the tank liquid during the process of entering the recovery tank, and the filtered tank liquid enters the recovery tank;

[0014] The discharge guide block is energized, and the tank liquid in the recovery tank is input into the mixing tank through the pump body 1, and the amount of electricity carried is detected in the process;

[0015] The conductivity of the bath liquid is obtained by calculating the ratio of the detected electric quantity to the discharged electric quantity.

[0016] According to the above technical solution, by repeating the steps S1 and S2, the conductivity and coating effect corresponding to the bath solution of different concentrations are obtained;

[0017] Draw a spline curve with the coating particle concentration as the horizontal axis and the conductivity as the vertical axis;

[0018] It is known that the best coating thickness of metal castings is m. During the working process, the closer the coating thickness of metal castings is to m, the better the coating effect is. A spline curve is drawn with the coating particle concentration as the horizontal axis and the coating effect as the vertical axis.

[0019] Observe the spline curve of paint particle concentration and coating effect, and determine the paint particle concentration when the coating effect is optimal.

[0020] According to the above technical solution, when the concentration of the coating particles is greater than the concentration required for electrophoresis, the concentration of the coating particles in the tank liquid is ensured to be maintained within the optimal range by inputting a solvent into the mixing tank;

[0021] When the concentration of the coating particles is less than the concentration required for electrophoresis, the concentration of the coating particles in the tank liquid is ensured to be maintained within an optimal range by inputting the coating particles into the mixing tank.

[0022] According to the above technical solution, four lifting rods equipped with a hydraulic drive system are fixedly installed at the bottom of the electrophoretic coating pool, and a fixing frame is fixedly installed on the top of the four lifting rods. The fixing frame is used to load metal castings. In order to load the metal castings, multiple metal strips are welded in the fixing frame, and the metal castings are hollow castings;

[0023] When sealing the two ends of the metal casting, an external sleeve is used for sealing. The sealing process is to divide the two ends of the metal casting into a top tube and a bottom tube, and a sealing sleeve 1 is spirally arranged on the top tube, and a sealing sleeve 2 is spirally arranged on the bottom tube.

[0024] A pipe opening 1 is arranged on the sealing sleeve 1, a pipe opening 2 is arranged on the sealing sleeve 2, the pipe openings 1 of all metal castings are connected to the main pipe 1, the pipe openings 2 of all metal castings are connected to the main pipe 2, the main pipe 1 is sealedly connected to the conduit 1, the main pipe 2 is sealedly connected to the conduit 2, and the conduit 1 and the conduit 2 are both connected to the box body.

[0025] According to the above technical solution, the sealing sleeve 1 includes a fixing part 1, an anode guide block and an anode thin rod. The fixing part 1 is a cylindrical shell. One side of the inner wall surface of the fixing part is provided with a thread, and the other side of the inner wall surface is provided with a mounting hole 1.

[0026] The thread is connected to the top pipe thread, the anode guide block is fixed in the mounting hole 1, a certain gap is left between the anode guide block and the inner wall of the fixing part, the end of the anode guide block away from the mounting hole 1 is fixedly connected to the anode thin rod, and the anode thin rod is located inside the metal casting.

[0027] According to the above technical solution, the sealing sleeve includes a second fixing member and a second cathode guide block, the second fixing member includes a second mounting hole and a second connecting hole, the structure of the second fixing member is the same as that of the first fixing member and will not be described again, the cathode guide block is fixed in the second connecting hole, and the cathode guide block is in contact with the inner wall of the metal casting;

[0028] The anode guide block is used to connect to the positive electrode of the power supply, and the cathode guide block is used to connect to the negative electrode of the power supply;

[0029] The box body also includes a pump body 1 and a flow guide pipe 2;

[0030] The recovery trough is communicated with the conduit 1, and the recovery trough is fixedly connected with the pump body 1. A guide tube 1 is fixed to the input end of the pump body 1, and the guide tube 1 penetrates the recovery trough and enters the interior thereof. The output end of the pump body 1 is fixedly connected with the guide tube 2, and the interior of the guide tube 2 is fixedly connected with the discharge guide block. The discharge guide block is connected to the power supply and is located on one side of the discharge guide block. The receiving guide block is fixedly connected to the interior of the guide tube 2, and the receiving guide block is electrically connected to the detector.

[0031] According to the above technical solution, the recovery tank is connected to the mixing tank through the guide pipe 2, and the mixing tank is connected to the solvent tank and the paint particle tank through the guide pipe 3 and the guide pipe 4 respectively, the guide pipe 3 is fixed to the pump body 2 at the connection with the solvent tank, and the guide pipe 4 is fixed to the pump body 3 at the connection with the paint particle tank.

[0032] According to the above technical solution, a stirring device is provided inside the mixing tank, and a pump body 4 is fixed above the mixing tank.

[0033] According to the above technical solution, a pump body 5 and a filter are provided at the connection between the recovery tank and the conduit 1.

[0034] Compared with the prior art, the beneficial effects achieved by the present invention are as follows: the present invention, by providing a filtering system, a 50um filter bag can meet the quality requirements of the paint film, ensuring that the paint film formed by the tank liquid during the coating process has good adhesion, glossiness, weather resistance and other properties; secondly, the 50um filter bag solves the clogging problem of the filter bag to a certain extent; compared with the filter bag with a larger aperture, the 50um filter bag achieves a balance in filtering effect and preventing clogging; by reasonably selecting a 50um filter bag, the quality and performance of the tank liquid can be guaranteed, the clogging problem of the filter bag can be solved, and the tank liquid production efficiency can be improved; in actual operation, the filter aperture should also be reasonably selected according to production needs and actual conditions to achieve the production of high-quality tank liquid; in terms of filter design, in addition to the mesh bag structure, other forms can also be considered, such as metal filter mesh, fiber filter layer, etc., to meet the needs of different tank liquids and processes; at the same time, the layout and installation method of the filter also need to be considered to ensure that the tank liquid can pass through the filter evenly and effectively during the transportation process.

[0035] By flexibly adjusting electrophoretic coating parameters, such as bath concentration and circulation volume, according to the different specifications and requirements of metal castings, efficient coating of different types of metal castings is achieved. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0037] Figure 1 is a schematic diagram of the overall front structure of an embodiment of the present invention;

[0038] Figure 2 The electrophoretic coating structure of the embodiment of the present invention is schematically shown in FIG. Figure 1 ;

[0039] Figure 3The electrophoretic coating structure of the embodiment of the present invention is schematically shown in FIG. Figure 2 ;

[0040] Figure 4 is a schematic diagram of main pipe 1 and main pipe 2 of an embodiment of the present invention;

[0041] Figure 5 is a schematic diagram of a metal casting according to an embodiment of the present invention;

[0042] Figure 6 is an exploded schematic diagram of an electrophoretic coating structure according to an embodiment of the present invention;

[0043] Figure 7 is a schematic diagram of the internal structure of a metal casting according to an embodiment of the present invention;

[0044] Figure 8 Embodiment of the present invention Figure 7 A magnified schematic diagram of region A;

[0045] Fig. 9 Embodiment of the present invention Figure 8 A magnified schematic diagram of region B;

[0046] Fig.10 Schematic diagram of the internal structure of the box according to an embodiment of the present invention;

[0047] Fig.11 is a schematic diagram of the relationship between the conductivity of the bath solution and the concentration of the coating particles in an embodiment of the present invention;

[0048] Fig.12 is a schematic diagram of the relationship between the conductivity of the bath solution and the concentration of the coating particles in an embodiment of the present invention;

[0049] In the figure: 1. electrophoretic coating pool; 2. box body; 201. recovery tank; 202. pump body one; 203. guide tube two; 204. discharge guide block; 205. receiving guide block; 206. detector; 207. mixing tank; 208. solvent tank; 209. paint particle tank; 210. pump body two; 211. pump body three; 3. conduit one; 4. conduit two; 5. fixing frame; 6. lifting rod; 7. top tube; 8. end tube; 9. sealing sleeve one; 901. fixing part one; 902. anode guide block; 903. anode thin rod; 10. sealing sleeve two; 1001. fixing part two; 1002. cathode guide block; 11. pipe mouth one; 12. pipe mouth two; 13. main line one; 14. main line two; 15. pump body four; 16. pump body five; 17. filter. DETAILED DESCRIPTION

[0050] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0051] See also Figure 1-12 , the present invention provides a technical solution: an electrophoretic coating production device and a production process, the device comprising an electrophoretic coating pool 1;

[0052] like Figure 1-6 As shown, in some embodiments, four lifting rods 6 equipped with a hydraulic drive system are fixedly installed at the bottom of the electrophoretic coating pool 1, and a fixing frame 5 is fixedly installed on the top of the four lifting rods 6. The fixing frame 5 is used to load metal castings. In order to load the metal castings, multiple metal strips are welded in the fixing frame 5, and multiple areas are formed by the metal strips to restrict the metal castings. The metal castings are hollow castings. By sealing the two ends of the metal castings, preparations are made for the electrophoretic coating production of metal castings.

[0053] When the two ends of the metal casting are sealed, an external sleeve is used for sealing. The sealing process device is to divide the two ends of the metal casting into a top tube 7 and a bottom tube 8. A sealing sleeve 1 9 is spirally arranged on the top tube 7, and a sealing sleeve 2 10 is spirally arranged on the bottom tube 8.

[0054] A pipe opening 11 is provided on the sealing sleeve 19, a pipe opening 2 12 is provided on the sealing sleeve 2 10, the pipe openings 11 of all metal castings are connected to the main pipe 13, the pipe openings 2 12 of all metal castings are connected to the main pipe 2 14, the main pipe 13 is sealed and connected to the conduit 13, the main pipe 2 14 is sealed and connected to the conduit 2 4, a box 2 is provided on one side of the electrophoretic coating pool 1, and the conduit 1 3 and the conduit 2 4 are both connected to the box 2;

[0055] like Figure 7 and Figure 8 As shown, in some embodiments, the sealing sleeve 9 includes a fixing member 901, an anode guide block 902 and an anode thin rod 903. The fixing member 901 is a cylindrical shell. One side of the inner wall of the fixing member 901 is provided with a thread, and the other side of the inner wall is provided with a mounting hole.

[0056] The thread is threadedly connected to the top tube 7, the anode guide block 902 is fixed in the mounting hole 1, a certain gap is left between the anode guide block 902 and the inner wall of the fixing part 901, the end of the anode guide block 902 away from the mounting hole 1 is fixedly connected to the anode thin rod 903, and the anode thin rod 903 is located inside the metal casting.

[0057] A connecting hole 1 is provided on the surface of the fixing member 901, and the connecting hole 1 is used to connect with the pipe mouth 11.

[0058] like Figure 7 and Fig. 9 As shown, in some embodiments, the sealing sleeve 10 includes a second fixing piece 1001 and a second cathode guide block 1002, the second fixing piece 1001 includes a second mounting hole and a second connecting hole, the structure of the second fixing piece 1001 is the same as the structure of the first fixing piece 901 and will not be repeated here, the cathode guide block 1002 is fixed in the second connecting hole, and the cathode guide block 1002 is in contact with the inner wall of the metal casting.

[0059] The anode guide block 902 is used to connect to the positive electrode of the power supply, and the cathode guide block 1002 is used to connect to the negative electrode of the power supply. Under the action of the electric field, the coating particles in the tank liquid will be deposited on the inner tube wall of the metal casting, and the electrophoretic coating process of the inner tube wall of the metal casting will be completed.

[0060] like Fig.10 As shown, in some embodiments, the box body 2 includes a recovery tank 201, a pump body 1 202, a guide pipe 2 203, a discharge guide block 204, a receiving guide block 205, a detector 206, a mixing tank 207, a solvent tank 208, a coating particle tank 209, a pump body 210, a pump body 3 211, wherein:

[0061] The recovery tank 201 is communicated with the conduit 3, and the recovery tank 201 is fixedly connected with the pump body 202. The input end of the pump body 202 is fixed with a guide tube 1, and the guide tube 1 penetrates the recovery tank 201 and enters the interior thereof. The output end of the pump body 202 is fixedly connected with the guide tube 2 203, and the interior of the guide tube 203 is fixedly connected with the discharge guide block 204. The discharge guide block 204 is connected to the power supply, and the discharge guide block 204 is used to discharge the tank liquid inside the guide tube 203, and is located on one side of the discharge guide block 204. The receiving guide block 205 is fixedly connected to the interior of the guide tube 203, and the receiving guide block 205 is electrically connected to the detector 206. The detector 206 is used to detect the amount of charge of the tank liquid flowing through the surface of the receiving guide block 205, and calculate the conductivity of the tank liquid.

[0062] The recovery tank 201 is connected to the mixing tank 207 through the guide pipe 203, and the mixing tank 207 is connected to the solvent tank 208 and the paint particle tank 209 through the guide pipe 3 and the guide pipe 4 respectively. The guide pipe 3 is fixed to the pump body 210 at the connection with the solvent tank 208, and the pump body 2 is used to transport the solvent inside the solvent tank 208 to the mixing tank 207. The guide pipe 4 is fixed to the pump body 3 211 at the connection with the paint particle tank 209, and the pump body 3 211 is used to transport the paint particles inside the paint particle tank 209 to the mixing tank 207.

[0063] A stirring device is provided inside the mixing tank 207, and the stirring device is used to stir the tank liquid inside the mixing tank 207. A pump body 415 is fixed above the mixing tank 207, and the pump body 415 is used to introduce the tank liquid inside the conduit 24 into the mixing tank 207.

[0064] A pump body 5 16 and a filter are provided at the connection between the recovery tank 201 and the conduit 1 3 , and the pump body 5 16 is used to guide the tank liquid in the conduit 1 3 into the interior of the recovery tank 201 .

[0065] Embodiment 1: In this embodiment, electrophoresis of metal castings is implemented, and efficient electrophoresis is achieved through this process.

[0066] The electrophoretic coating process of metal surface is: pre-cleaning → online → degreasing → water washing → rust removal → water washing → neutralization → water washing → phosphating → water washing → passivation → electrophoretic coating → tank cleaning → ultrafiltration water washing → drying → offline;

[0067] Pre-cleaning process: The substrate and pre-treatment of the coated object have a great influence on the electrophoretic coating. Metal castings are generally derusted by sandblasting or shot blasting. Cotton yarn is used to remove dust on the surface of the workpiece, and 80#~120# sandpaper is used to remove steel shots and other debris remaining on the surface. The surface of the metal casting is degreased and derusted. When the electrophoretic coating of metal castings has high requirements on the surface, phosphating and passivation surface treatments are performed. Metal castings must be phosphated before anodic electrophoresis, otherwise the corrosion resistance of the paint film is poor. During phosphating, zinc salt phosphating film is generally selected with a thickness of about 1~2um, and the phosphating film is required to be fine and uniform in crystallization.

[0068] The staff fixes the metal casting in the fixing frame 5, and connects the sealing sleeve 1 9 to the top pipe 7, the sealing sleeve 2 10 to the end pipe 8, and the discharge guide block 204 is connected to the power supply.

[0069] The recovery tank 201 is filled with tank liquid, the solvent tank 208 is filled with solvent, and the coating particle tank 209 is filled with coating particles.

[0070] By transferring the bath liquid from the terminal tube 8 of the metal casting to the top tube 7, the anode guide block 902 is connected to the positive electrode of the power supply, and the cathode guide block 1002 is connected to the negative electrode of the power supply. Under the action of the connection, the anode thin rod 903 acts as an anode, and the inner wall of the metal casting acts as a cathode. Under the action of the electric field, the coating particles in the bath liquid will be deposited on the inner tube wall of the metal casting, and the electrophoretic coating process of the inner tube wall of the metal casting is completed;

[0071] The size of the circulation volume of the electrophoretic coating circulation system is controlled by controlling the pump body four 15 and the pump body five 16. The size of the circulation volume of the electrophoretic coating circulation system directly affects the stability of the bath liquid and the quality of the paint film. If the bath liquid circulation volume is increased by the pump body four 15 and the pump body five 16, the precipitation and bubbles of the bath liquid are reduced, and the quality of the paint film is improved. However, the bath liquid ages faster, the energy consumption increases, and the stability of the bath liquid deteriorates. If the bath liquid circulation volume is reduced by the pump body four 15 and the pump body five 16, the quality of the paint film is poor. It is ideal to control the number of bath liquid cycles to 6 to 8 times / h, which not only ensures the quality of the paint film, but also ensures the stable operation of the bath liquid.

[0072] As the tank liquid is circulated, the impurities in the tank liquid are removed by the filter 17 to ensure the quality and stability of the tank liquid. Its structure is mainly a mesh bag type. The pore size of the mesh bag filter has a direct impact on the filtering effect of the tank liquid and the quality of the paint film. Generally speaking, the pore size of the filter is between 25 and 75 um. Within this range, the electrophoresis tank liquid is transported to the filter for filtration through a vertical pump. In this process, impurities in the tank liquid are effectively intercepted on the filter, thereby ensuring the cleanliness of the tank liquid. However, in actual operation, the pore size of the filter is not the larger the better. Considering factors such as the comprehensive replacement cycle and the quality of the paint film, the filter bag with a pore size of 50 um is considered to be the best choice. First of all, the filter bag with a 50 um pore size can meet the quality requirements of the paint film and ensure that the paint film formed by the tank liquid during the coating process has good adhesion and gloss. Secondly, the 50um filter bag solves the clogging problem of the filter bag to a certain extent. Compared with the filter bag with larger pore size, the 50um filter bag reaches a balance in filtering effect and preventing clogging. By reasonably selecting the 50um filter bag, the quality and performance of the tank liquid can be guaranteed, and the clogging problem of the filter bag can be solved, thereby improving the tank liquid production efficiency. In actual operation, the pore size of the filter 17 should be reasonably selected according to production needs and actual conditions to achieve the production of high-quality tank liquid. In the design of the filter 17, in addition to the mesh bag structure, other forms can also be considered, such as metal filter mesh, fiber filter layer, etc., to meet the needs of different tank liquids and processes. At the same time, the layout and installation method of the filter also need to be considered to ensure that the tank liquid can pass through the filter 17 evenly and effectively during the transportation process.

[0073] In terms of operation management, the use of the filter should be checked regularly, and the blocked or damaged filter bags should be replaced in time. In addition, it is also necessary to pay attention to controlling the delivery speed and pressure of the tank liquid to avoid excessive flow rate causing impact and damage to the filter. At the same time, it is also very important to keep the filter system clean and hygienic to prevent the growth of impurities and microorganisms;

[0074] By installing sensors and control systems, the flow, pressure and filtration effect of the tank liquid can be monitored in real time, the operating parameters of the filter can be automatically adjusted, and intelligent control can be achieved. This can not only improve the stability and reliability of the filtration system, but also reduce the difficulty and cost of manual operation, optimize the design and operation management of the filtration system, and combine with the application of intelligent technology, which will help improve the quality and efficiency of tank liquid production.

[0075] An ultrafiltration system is set up during the circulation of the tank liquid. The ultrafiltration system can effectively control the concentration of impurity ions in the tank liquid circulation and filtration process, thereby ensuring the coating quality. The quality of coating directly affects the service life and appearance of the product. Therefore, the stable operation of the ultrafiltration system is crucial.

[0076] During the operation of the ultrafiltration system, once the ultrafiltration system is started, it must maintain continuous operation. Interruption of operation is strictly prohibited because the ultrafiltration membrane is prone to dryness and stickiness after a long period of non-operation. Once the surface of the ultrafiltration membrane is dry and adheres to impurity ions, these impurity ions will seriously affect the water permeability and service life of the ultrafiltration membrane. Therefore, maintaining the continuous operation of the ultrafiltration system is the basis for ensuring its normal operation.

[0077] In addition, the water output rate of the ultrafiltration membrane will gradually decrease with the passage of time. This is because the impurities on the membrane surface continue to accumulate, resulting in a decrease in the membrane's water permeability. In order to ensure the amount of ultrafiltration water required for ultrafiltration immersion and flushing, the ultrafiltration system should be cleaned after working continuously for 30 to 40 days. This can effectively remove impurities on the membrane surface, restore the membrane's water permeability, and extend its service life. At the same time, through reasonable maintenance of the ultrafiltration system, the failure rate can also be reduced and the equipment service life can be increased.

[0078] Electrophoretic coating plays an important role in modern industrial production, especially in the production process of large-scale assembly lines. It shows extremely high efficiency and effect. This coating method can not only improve the surface quality of the product, but also greatly improve production efficiency. The renewal cycle of the bath liquid should be within 3 months. This is because the bath liquid will gradually produce impurities and precipitation during long-term use. These impurities will affect the coating effect and reduce the quality of the product.

[0079] Embodiment 2: Based on embodiment 1, the chamber of this process also has the function of detecting the concentration of coating particles in the bath liquid, and the concentration of coating particles in the bath liquid is reflected by measuring the conductivity of the bath liquid.

[0080] S 1 : The filtered tank liquid enters the recovery tank 201, and the tank liquid in the recovery tank 201 passes through the discharge guide block 204. If the discharge amount of the discharge guide block 204 is a, when the tank liquid passes through the receiving guide block 205, due to the conductivity of the coating particles in the tank liquid, the detector 206 can detect the amount of electricity of the tank liquid flowing through the surface of the receiving guide block 205. At this time, the amount of electricity detected by the detector 206 is b, and the conductivity of the tank liquid is d, and

[0081] S 2 : Extract the tank liquid in the recovery tank 201 as a sample, and use a laser particle size analyzer to detect the concentration of coating particles in the tank liquid as c, and observe the electrophoretic coating effect of the metal casting at this concentration;

[0082] S 3 : A spline curve is drawn by detecting different concentrations of coating particles in the bath and their corresponding conductivity, and a spline curve is drawn by detecting different concentrations of coating particles in the bath and the corresponding coating effects of metal castings;

[0083] S 4 :Test the conductivity of the bath solution with the same coating particle concentration at different temperatures. 3 The concentration of paint particles was found to be C 1 The coating effect of the tank liquid is the best. When the coating particle concentration of the tank liquid is C 1 When the bath liquid is heated by placing a heating device in the recovery tank 201, the conductivity of the bath liquid is measured after a period of circulation. By measuring the bath liquids at different temperatures for multiple times, it is found that the conductivity of the bath liquid is the highest when the temperature is w, and the conductivity of the bath liquid at this time is d 1 .

[0084] S 5 : During operation, the conductivity of the tank liquid is calculated by the receiving guide block 205 and the detector 206, and the concentration of the coating particles in the tank liquid in the recovery tank 201 is obtained;

[0085] When the concentration of the coating particles is greater than the concentration required for electrophoresis, the solvent in the solvent tank 208 is input into the mixing tank 207 through the second pump body 210;

[0086] When the concentration of the coating particles is less than the concentration required for electrophoresis, the coating particles in the coating particle tank 209 are input into the mixing tank 207 through the pump body 3 211;

[0087] The specific amount of coating particles or solvent input into the mixing tank 207 is related to the volume of the tank liquid in the mixing tank 207 according to the difference between the actual concentration and the required concentration. For example, when the actual concentration of coating particles in the tank liquid is C 2 , when the existing tank liquid volume in the mixing tank 207 is L, the specific amount of the coating particles or solvent input into the mixing tank 207 is L|C 1 -C 2 |.

[0088] Example 3, based on Example 2, the specific steps of S1 are as follows:

[0089] During the electrophoretic coating of metal castings, the bath liquid is introduced into the recovery tank, and the excess impurities are filtered out of the bath liquid during the process of entering the recovery tank, and the filtered bath liquid enters the recovery tank;

[0090] The discharge guide block is energized, and the tank liquid in the recovery tank is input into the mixing tank through the pump body 1, and the amount of electricity carried is detected in the process;

[0091] The conductivity of the bath liquid is obtained by calculating the ratio of the detected electric quantity to the discharged electric quantity.

[0092] The specific steps of S3 are as follows:

[0093] By repeating the steps of S1 and S2, the conductivity and coating effect corresponding to the bath solution of different concentrations are obtained;

[0094] Draw a spline curve with the coating particle concentration as the horizontal axis and the conductivity as the vertical axis;

[0095] It is known that the best coating thickness of metal castings is m. During the working process, the closer the coating thickness of metal castings is to m, the better the coating effect is. A spline curve is drawn with the coating particle concentration as the horizontal axis and the coating effect as the vertical axis.

[0096] Observe the spline curve of paint particle concentration and coating effect, and determine the paint particle concentration when the coating effect is optimal.

[0097] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0098] Finally, it should be noted that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A concentration detection method for an electrophoretic coating production device, comprising an electrophoretic coating pool, characterized in that: A box is provided on one side of the electrophoretic coating pool, and the box includes a recovery tank and a mixing tank, the recovery tank is used to recover the tank liquid after the electrophoresis is completed, and the mixing tank is used to process the tank liquid in the recovery tank and reuse it, and a second guide pipe is connected between the recovery tank and the mixing tank; The concentration detection method is as follows: S1: Detect the concentration of paint particles in the tank liquid at different conductivity. The filtered tank liquid enters the recovery tank and discharges at one end of the second guide tube close to the recovery tank with a discharge amount of a. The charge of the tank liquid at the other end of the second guide tube is detected to be b. The conductivity of the tank liquid is calculated as The coating particle concentration C of the bath solution sample in the recovery tank is extracted and detected, and a first spline curve is drawn according to different coating particle concentrations in the bath solution and their corresponding electrical conductivity; S2: Detecting the electroplating effect of the bath solution at different coating particle concentrations, observing the electrophoretic coating effect of the metal casting at the current concentration when detecting the concentration of coating particles in the bath solution, and drawing a second spline curve according to different coating particle concentrations in the bath solution and the corresponding electrophoretic coating effect of the metal casting, and determining through the second spline curve that the bath solution coating effect is best when the coating particle concentration is C1; S3: Detect the conductivity of the bath liquid with the same coating particle concentration at different temperatures. When the coating particle concentration of the bath liquid is C1, adjust the bath liquid temperature through the heating device, measure and find the temperature w with the highest conductivity; S4: During the electrophoretic coating of metal castings, the bath temperature is maintained at w, the conductivity of the bath liquid is calculated and the concentration C2 of the paint particles in the bath liquid in the recovery tank is obtained through the first profile curve. The amount of paint particles or solvent that needs to be input into the mixing tank is L|C1-C2|, where L is the capacity of the existing bath liquid in the mixing tank.

2. The concentration detection method of an electrophoretic coating production device according to claim 1, characterized in that: The specific steps of S1 are as follows: During the electrophoretic coating of metal castings, the bath liquid is introduced into the recovery tank, and excess impurities are filtered out of the bath liquid during the process of entering the recovery tank, and the filtered bath liquid enters the recovery tank; A discharge guide block is provided at one end of the second guide tube close to the recovery tank and is energized, and a receiving guide block is provided at the other end of the second guide tube. The tank liquid in the recovery tank is input into the mixing tank, and the amount of electricity carried by the receiving guide block is detected during this process; The paint particle concentration of the bath liquid in the recovery tank is extracted and detected. The first line curve is drawn through multiple detections. It can be found that as the coating work on the metal casting proceeds, the paint particle concentration of the bath liquid gradually decreases, and the conductivity of the bath liquid gradually decreases.

3. The concentration detection method of an electrophoretic coating production device according to claim 1, characterized in that: The specific steps of S2 are as follows: Detecting the particle concentration of the tank liquid in the recovery tank, inputting the tank liquid in the recovery tank into the mixing tank and starting electrophoretic coating of the metal casting, and observing the coating effect of the metal cast iron after the electrophoretic coating is completed; Given that the optimal coating thickness of metal castings is m, a spline curve is drawn with the coating particle concentration as the horizontal axis and the coating effect as the vertical axis; Observe the spline curve of paint particle concentration and coating effect, and determine the paint particle concentration when the coating effect is optimal.

4. The concentration detection method of an electrophoretic coating production device according to claim 1, characterized in that: The specific steps of S5 are as follows: When the concentration of the coating particles is greater than the concentration required for electrophoresis, a solvent is input into the mixing tank; When the concentration of the coating particles is less than the concentration required for electrophoresis, the coating particles are input into the mixing tank.

5. An electrophoretic coating production device, characterized in that: The box body includes a pump body 1, a receiving guide block, a detector, a solvent tank, a paint particle tank, a pump body 2, a pump body 3, wherein: The recovery tank is communicated with the conduit 1, the recovery tank is fixedly connected with the pump body 1, the input end of the pump body 1 is fixed with a guide tube 1, the guide tube 1 penetrates the recovery tank and enters the interior thereof, the output end of the pump body 1 is fixedly connected with the guide tube 2, the interior of the guide tube 2 is fixedly connected with the discharge guide block, the discharge guide block is connected with the power supply and is located on one side of the discharge guide block, the receiving guide block is fixedly connected with the interior of the guide tube 2, and the receiving guide block is electrically connected with the detector; The recovery tank is connected to the mixing tank through the guide pipe 2, and the mixing tank is connected to the solvent tank and the paint particle tank through the guide pipe 3 and the guide pipe 4 respectively. The guide pipe 3 is fixed to the pump body 2 at the connection with the solvent tank, and the guide pipe 4 is fixed to the pump body 3 at the connection with the paint particle tank; A stirring device is provided inside the mixing tank, and the stirring device is used to stir the tank liquid inside the mixing tank. A pump body 4 is fixed above the mixing tank; A pump body 5 and a filter are arranged at the connection between the recovery tank and the conduit 1.

6. The electrophoretic coating production device according to claim 5, characterized in that: Four lifting rods equipped with a hydraulic drive system are fixedly installed at the bottom of the electrophoretic coating pool, and a fixing frame is fixedly installed on the top of the four lifting rods. The fixing frame is used to load metal castings. In order to load the metal castings, multiple metal strips are welded in the fixing frame. The metal castings are hollow castings. When sealing the two ends of the metal casting, an external sleeve is used for sealing. The sealing process is to divide the two ends of the metal casting into a top tube and a bottom tube, and a sealing sleeve 1 is spirally arranged on the top tube, and a sealing sleeve 2 is spirally arranged on the bottom tube; The sealing sleeve 1 is provided with a pipe opening 1, the sealing sleeve 2 is provided with a pipe opening 2, the pipe openings 1 of all metal castings are connected to the main pipe 1, the pipe openings 2 of all metal castings are connected to the main pipe 2, the main pipe 1 is sealedly connected to the conduit 1, the main pipe 2 is sealedly connected to the conduit 2, and the conduit 1 and the conduit 2 are both connected to the box body; The sealing sleeve 1 includes a fixing part 1, an anode guide block and an anode thin rod. The fixing part 1 is a cylindrical shell. One side of the inner wall of the fixing part is provided with a thread, and the other side of the inner wall of the fixing part is provided with a mounting hole 1. The thread is connected to the top pipe thread, the anode guide block is fixed in the mounting hole 1, a certain gap is left between the anode guide block and the inner wall of the fixing part, the end of the anode guide block away from the mounting hole 1 is fixedly connected to the anode thin rod, and the anode thin rod is located inside the metal casting.

7. The electrophoretic coating production device according to claim 6, characterized in that: A connection hole 1 is provided on the surface of the fixing member 1, and the connection hole 1 is used to connect with the pipe opening 1; The sealing sleeve comprises a second fixing member and a second cathode guide block, the second fixing member comprises a second mounting hole and a second connecting hole, the structure of the second fixing member is the same as that of the first fixing member and will not be described again, the cathode guide block is fixed in the second connecting hole, and the cathode guide block contacts the inner wall of the metal casting; The anode guide block is used to connect to the positive electrode of the power supply, and the cathode guide block is used to connect to the negative electrode of the power supply; The box body also includes a pump body 1 and a flow guide pipe 2; The recovery trough is communicated with the conduit 1, and the recovery trough is fixedly connected with the pump body 1. A guide tube 1 is fixed to the input end of the pump body 1, and the guide tube 1 penetrates the recovery trough and enters the interior thereof. The output end of the pump body 1 is fixedly connected with the guide tube 2, and the interior of the guide tube 2 is fixedly connected with the discharge guide block. The discharge guide block is connected to the power supply and is located on one side of the discharge guide block. The receiving guide block is fixedly connected to the interior of the guide tube 2, and the receiving guide block is electrically connected to the detector.

8. The electrophoretic coating production device according to claim 7, characterized in that: The recovery tank is connected to the mixing tank through the guide pipe 2, and the mixing tank is connected to the solvent tank and the paint particle tank through the guide pipe 3 and the guide pipe 4 respectively. The guide pipe 3 is fixed to the pump body 2 at the connection with the solvent tank, and the guide pipe 4 is fixed to the pump body 3 at the connection with the paint particle tank.

9. The electrophoretic coating production device according to claim 8, characterized in that: A stirring device is arranged inside the mixing tank, and a pump body 4 is fixed above the mixing tank.

10. The electrophoretic coating production device according to claim 9, characterized in that: A pump body 5 and a filter are arranged at the connection between the recovery tank and the conduit 1.

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