A feeding system and temperature control method of a color coating machine in a color coating process

Abstract

The invention discloses a feeding system of a color coating machine in a color coating process and a temperature control method thereof, comprising a constant temperature stirring tank and a pneumatic diaphragm pump feeding system, wherein the constant temperature stirring tank is provided with a paint feeding port and a paint reflux port, one end of the pneumatic diaphragm pump feeding system is connected with the constant temperature stirring tank at the paint feeding port, and the other end is connected with the constant temperature stirring tank at the paint reflux port, and the constant temperature stirring tank forms a closed loop through the pneumatic diaphragm pump feeding system; the feeding system of the color coating machine in the color coating process can effectively convey and reflux the paint when in use, which is beneficial to saving resources, and the paint temperature and the coating film thickness on the strip can be adjusted, and the temperature control method can obtain accurate paint temperature, thereby keeping the paint temperature in the tank constant, which will directly improve the color coating quality of the strip and meet production needs.

Description

Technical Field

[0001] The invention relates to the technical field of strip color coating technology, and in particular to a feeding system of a color coating machine in the color coating technology and a temperature control method thereof. Background Art

[0002] The roller color coating machine is one of the important equipment in the production of aluminum alloy half bags. It mainly performs surface color coating on cold-rolled strips after trimming, cleaning, straightening and passivation. The feeding system is also an important part of the color coating machine. The coating mechanism of the roller color coating machine is also called the coating head, which consists of a feeding roller, a coating roller and a paint tray. The function of the feeding roller is to pick up the paint from the paint tray and transfer the paint to the coating roller, which applies the paint to the surface of the coil. The color coating of coil materials is a continuous production process, and paint needs to be continuously supplied to the material tray during the operation of the equipment. The traditional feeding method is to lift the paint in the paint bucket into the material tray through a pneumatic diaphragm pump, and the pick-up roller immersed in the material tray transfers the paint to the coating roller. The excess paint in the material tray flows back into the paint bucket through the return pipe on the upper part of the material tray. An agitator is installed in the paint bucket to prevent the paint surface from solidifying and forming crusts. However, the traditional feeding method cannot adjust the coating thickness according to demand, and the temperature in the tank is unstable, and the viscosity of the paint cannot be adjusted according to the temperature, which will directly affect the color coating quality of the strip. Summary of the invention

[0003] The purpose of the present invention is to solve the above-mentioned problems and to provide a device that can effectively transport and reflux paint during use, which is beneficial to saving resources, and the paint temperature and the coating thickness on the strip can be adjusted, and its temperature control method can obtain accurate paint temperature, thereby keeping the paint temperature in the tank constant, which will directly improve the color coating quality of the strip and meet the production needs of the color coating process. The feeding system and temperature control method of the color coating machine.

[0004] To achieve the above-mentioned purpose, the technical solution of the present invention is: a feeding system of a color coating machine in a color coating process and a temperature control method thereof, comprising a constant temperature stirring tank and a pneumatic diaphragm pump feeding system, the constant temperature stirring tank being provided with a paint feeding port and a paint return port, one end of the pneumatic diaphragm pump feeding system being connected to the constant temperature stirring tank at the paint feeding port, and the other end being connected to the constant temperature stirring tank at the paint return port, the constant temperature stirring tank forming a closed loop through the pneumatic diaphragm pump feeding system.

[0005] Preferably, the pneumatic diaphragm pump feeding system includes a feeding pipeline, a return pipeline, a pneumatic diaphragm pump and a material tray. One end of the feeding pipeline is connected to the constant temperature stirring tank at the paint feeding port, and the other end is connected to the material tray. One end of the return pipeline is connected to the material tray, and the other end is connected to the constant temperature stirring tank at the paint return port. The pneumatic diaphragm pump is arranged on the feeding pipeline.

[0006] Preferably, a feeding roller and a coating roller are provided in the material tray, wherein the material tray is established along the length direction of the feeding roller and the coating roller, the circumferential surface of the feeding roller contacts the paint in the material tray, and the coating roller is arranged at the upper right of the feeding roller, wherein a gap is left between the feeding roller and the coating roller.

[0007] Preferably, the constant temperature stirring tank is also provided with a cold water inlet and a hot water outlet for adjusting the internal temperature, and a temperature sensor for detecting the temperature of the paint is provided inside the constant temperature stirring tank.

[0008] Preferably, the thermostatic stirring tank is provided with a feeding port at the top and an emptying port at the bottom.

[0009] Preferably, an end cover is further provided on the top of the constant temperature stirring tank, and a pneumatic stirrer is provided on the end cover, and a stirring rod of the pneumatic stirrer extends vertically into the constant temperature stirring tank.

[0010] The present invention also discloses a temperature control method of a feeding system of a color coating machine in a color coating process, comprising the following steps:

[0011] (1) Check the temperature sensor manual to determine the measurement error variance R of the temperature sensor;

[0012] (2) Determine the fluctuation variance Q of the paint temperature during the stirring process using statistical methods;

[0013] (3) Let the temperature value measured by the temperature sensor be X. When the system starts, let X eve =X,P eve =1, where X eve is the optimal estimated value of temperature at the previous moment, P eve is the error variance of the optimal estimated value of temperature at the previous moment;

[0014] (4) After the system is started, the loop is executed iteratively.

[0015] Preferably, the step (4) further comprises the following steps:

[0016] (4.1) Use the temperature measurement value at the previous moment to predict the current temperature, X pre =X eve , where X pre is the estimated value of the current moment for the next moment;

[0017] (4.2) Calculate the prediction error variance, P pre =P eve +Q, where P pre is the forecast error covariance;

[0018] (4.3) Calculate the gain, K = P pre / (P pre +R), where K is the filter gain,

[0019] (4.4) Combined with the temperature measurement value X of the current scanning cycle, calculate the optimal estimate, X / =X pre +K(XX pre );

[0020] (4.5) Error method for calculating the optimal temperature estimate, P / = (1-K)X pre ;

[0021] (4.6) X / As the actual value of the paint temperature in the current cycle, it is sent to PID control to realize temperature closed-loop control;

[0022] (4.7) Let P eve =P / , X eve =X / , iteratively performs calculation and control of the next scanning cycle;

[0023] (4.8) Repeat the above steps 4.1-4.7 repeatedly.

[0024] The present invention discloses a feeding system of a color coating machine in a color coating process and a temperature control method thereof, comprising a constant temperature stirring tank and a pneumatic diaphragm pump feeding system, wherein the constant temperature stirring tank is provided with a paint feeding port and a paint reflux port, one end of the pneumatic diaphragm pump feeding system is connected with the constant temperature stirring tank at the paint feeding port, and the other end is connected with the constant temperature stirring tank at the paint reflux port, and the constant temperature stirring tank forms a closed loop through the pneumatic diaphragm pump feeding system; the feeding system of the color coating machine in the color coating process can effectively convey and reflux the paint when in use, which is beneficial to saving resources, and the paint temperature and the coating film thickness on the strip can be adjusted, and the temperature control method can obtain accurate paint temperature, thereby keeping the paint temperature in the tank constant, which will directly improve the color coating quality of the strip and meet production needs. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 The present invention is a schematic structural diagram of a feeding system of a color coating machine and a temperature control method thereof in a color coating process.

[0026] Figure 2 The figure is a principle block diagram of the constant temperature control system of the stirring tank in the present invention.

[0027] Figure 3 It is a temperature measurement curve diagram of the constant temperature control method of the stirring tank of the present invention.

[0028] Among them: 1. Constant temperature stirring tank; 11. Feeding port; 12. Cold water inlet; 13. Hot water outlet; 14. Drain port; 15. Pneumatic agitator; 16. Paint feeding port; 17. Paint return port; 2. Pneumatic diaphragm pump feeding system; 21. Feeding pipeline; 22. Return pipeline; 23. Pneumatic diaphragm pump; 24. Material tray; 25. Feeding roller; 26. Coating roller. DETAILED DESCRIPTION

[0029] The present invention will now be described in further detail with reference to the accompanying drawings. The accompanying drawings are simplified schematic diagrams, which only illustrate the basic structure of the present invention in a schematic manner, and thus only show the components related to the present invention.

[0030] Please refer to Figure 1 The technical solution of the present invention is: a feeding system of a color coating machine in a color coating process and a temperature control method thereof, comprising a constant temperature stirring tank 1 and a pneumatic diaphragm pump feeding system 2, the constant temperature stirring tank 1 is provided with a paint feeding port 16 and a paint return port 17, one end of the pneumatic diaphragm pump feeding system 2 is connected to the constant temperature stirring tank 1 at the paint feeding port 16, and the other end is connected to the constant temperature stirring tank 1 at the paint return port 17, the constant temperature stirring tank 1 forms a closed loop through the pneumatic diaphragm pump feeding system 2 to color coat the strip.

[0031] In the scheme of the present invention, the pneumatic diaphragm pump feeding system 2 includes a feeding pipeline 21, a return pipeline 22, a pneumatic diaphragm pump 23 and a material tray 24. One end of the feeding pipeline 21 is connected to the constant temperature stirring tank 1 at the paint feeding port 16, and the other end is connected to the material tray 24. One end of the return pipeline 22 is connected to the material tray 24, and the other end is connected to the constant temperature stirring tank 1 at the paint return port 17. The pneumatic diaphragm pump 23 is arranged on the feeding pipeline 21; at this time, the paint in the constant temperature stirring tank 1 is transported to the material tray 24 through the feeding pipeline 21 by the pneumatic diaphragm pump 23, and the remaining paint after use will flow back to the constant temperature stirring tank 1 through the return pipeline 22.

[0032] Furthermore, a feeding roller 25 and a coating roller 26 are provided in the material tray 24, wherein the material tray 24 is set up along the length direction of the feeding roller 25 and the coating roller 26, the circumferential surface of the feeding roller 25 contacts the paint in the material tray 24, and the coating roller 26 is set up at the upper right of the feeding roller 25, wherein a gap is left between the feeding roller 25 and the coating roller 26, and the strip is set up vertically and fits the coating roller 26; during operation, the paint is conveyed into the material tray 24, and when the feeding roller 25 rotates, the paint will be adhered to the circumferential surface of the feeding roller 25, and since the coating roller 26 is close to the feeding roller 25, the paint is further adhered to the coating roller 26, and when the coating roller 26 rotates, the paint is applied to the surface of the strip to complete the color coating.

[0033] The gap between the feed roller 25 and the coating roller 26 is adjustable, so that the coating thickness on the strip surface is adjustable. Specifically, when the gap between the feed roller 25 and the coating roller 26 increases, the paint wrapped on the surface of the feed roller 25 becomes thicker, so that the paint on the coating roller 26 becomes thicker, and finally the coating thickness of the color coating on the strip surface increases; similarly, when the gap between the feed roller 25 and the coating roller 26 decreases, the coating thickness of the color coating on the strip surface will decrease, and it can be adjusted according to demand to meet production needs.

[0034] As a preferred embodiment, the constant temperature stirring tank 1 is also provided with a cold water inlet 12 and a hot water outlet 13 for adjusting the internal paint temperature. The constant temperature stirring tank 1 is provided with a temperature sensor for detecting the paint temperature, wherein the temperature reading of the temperature sensor can be adjusted according to the speed of the cold water inlet 12 and the hot water outlet 13 entering and exiting the cold water. The top of the constant temperature stirring tank 1 is provided with a feeding port 11, and the bottom is provided with an emptying port 14. The top of the constant temperature stirring tank 1 is also provided with an end cover, wherein the end cover can effectively reduce the volatilization of the paint thinner in the tank and the heat loss. The end cover is provided with a pneumatic agitator 15, and the stirring rod of the pneumatic agitator 15 extends vertically into the constant temperature stirring tank 1 to heat the material evenly and mix it with other reagents.

[0035] When the feeding system and temperature control method of the color coating machine in the color coating process are used, the paint and reagents are first added to the constant temperature stirring tank 1 at the feeding port 11, the pneumatic stirrer 15 is started to stir it evenly, and then the internal paint temperature is adjusted by the cold water inlet 12 and the hot water outlet 13. When the material is used, the pneumatic diaphragm pump 23 is started, and the paint is transported to the material tray 24 through the pneumatic diaphragm pump 23 through the feeding pipeline 21. When the material collection roller 25 and the coating roller 26 rotate, the paint is applied to the strip, and the remaining paint in the material tray 24 will flow back to the constant temperature stirring tank 1 through the reflux pipeline 22, which is conducive to saving resources and recycling. When the coating thickness on the strip needs to be adjusted, it is only necessary to adjust the gap between the material collection roller 25 and the coating roller 26 to meet the production needs.

[0036] The present invention also discloses a temperature control method of a feeding system of a color coating machine in a color coating process, comprising the following steps:

[0037] (1) Check the temperature sensor manual to determine the measurement error variance R of the temperature sensor;

[0038] (2) Determine the fluctuation variance Q of the paint temperature during the stirring process using statistical methods;

[0039] (3) Let the temperature value measured by the temperature sensor be X. When the system starts, let X eve =X,P eve =1, where X eve is the optimal estimated value of temperature at the previous moment, P eveis the error variance of the optimal estimated value of temperature at the previous moment;

[0040] (4) After the system is started, the loop is executed iteratively.

[0041] Furthermore, the step (4) further includes the following steps:

[0042] (4.1) Use the temperature measurement value at the previous moment to predict the current temperature, X pre =X eve , where X pre is the estimated value of the next moment at the current moment; where pre is the abbreviation of predict, which means prediction;

[0043] (4.2) Calculate the prediction error variance, P pre =P eve +Q, where P pre is the forecast error covariance;

[0044] (4.3) Calculate the gain, K = P pre / (P pre +R), where K is the filter gain,

[0045] (4.4) Combined with the temperature measurement value X of the current scanning cycle, calculate the optimal estimate, X / =X pre +K(XX pre );

[0046] (4.5) Error method for calculating the optimal temperature estimate, P / = (1-K)X pre ;

[0047] (4.6) X / As the actual value of the paint temperature in the current cycle, it is sent to the PID (proportional integral differential controller) to achieve temperature closed-loop control;

[0048] (4.7) Let P eve =P / , X eve =X / , iteratively performs calculation and control of the next scanning cycle;

[0049] (4.8) Repeat the above steps 4.1-4.7 repeatedly.

[0050] See also Figure 2The temperature sensor is affected by the sensor measurement accuracy and the uniformity of the paint temperature, and the measured value has a certain error. After the above temperature control method is used, the accurate paint temperature value is obtained, and the PID (proportional integral differential controller) is further used to adjust the opening of the hot water outlet proportional valve in real time to ensure that the paint temperature in the mixing tank is consistent with the set value.

[0051] See also Figure 3 , set the temperature setting value in the system to 24℃, the temperature sensor error variance to R=0.25, and the paint temperature fluctuation variance to Q=0.8. Figure 3 As shown in the upper part, the temperature value measured by the sensor is the gray line, and the final estimated temperature value after the temperature control method proposed in the present invention is the black line. Figure 3 It can be seen that the temperature control method proposed in the present invention can make the paint temperature control more stable, effectively reduce the temperature fluctuation caused by the temperature sensor itself and external reasons, and is conducive to more stable temperature control; Figure 3 As shown in (the lower part), it shows that the error variance of the optimal temperature estimate is convergent, that is, the method adopted in the present invention has extremely high stability.

[0052] When the temperature control method is in operation, the above steps are performed in sequence, and steps 4.1-4.7 are loop iterative operations. When the system is running as a whole, the loop iterative operation is performed continuously; and the final loop iterative operation value X / The closest paint temperature value, in X / The temperature value is the standard for adjusting the paint temperature; when X / When it is greater than or less than the set value, the PID controller is further used to adjust the opening of the proportional valve at the hot water outlet 13 in real time to ensure that the paint temperature in the mixing tank is consistent with the set value. After cyclic iterative calculations, the actual temperature deviates from the temperature measured by the temperature sensor, and the temperature required in the production process only needs to be adjusted by X / By comparing it with the set value, the internal temperature can be adjusted in time to further improve the color coating quality of the strip.

[0053] Obviously, the above embodiments are merely examples for the purpose of clear explanation, and are not intended to limit the implementation methods. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived therefrom are still within the scope of protection of the invention.

Claims

1. A feeding system for a color coating machine in a color coating process, characterized in that: It includes a constant temperature stirring tank and a pneumatic diaphragm pump feeding system, the constant temperature stirring tank is provided with a paint feeding port and a paint return port, one end of the pneumatic diaphragm pump feeding system is connected to the constant temperature stirring tank at the paint feeding port, and the other end is connected to the constant temperature stirring tank at the paint return port, and the constant temperature stirring tank forms a closed loop through the pneumatic diaphragm pump feeding system; The temperature control method of the feeding system of the color coating machine in the color coating process includes the following steps: (1) Check the temperature sensor manual to determine the measurement error variance R of the temperature sensor; (2) Determine the fluctuation variance Q of the paint temperature during the stirring process using statistical methods; (3) Let the temperature value measured by the temperature sensor be X. When the system starts, let X eve =X,P eve =1, where X eve is the optimal estimated value of temperature at the previous moment, P eve is the error variance of the optimal estimated value of temperature at the previous moment; (4) After the system is started, the loop is iterated and executed; Step (4) also includes the following steps: (4.1) Use the temperature measurement value at the previous moment to predict the current temperature, X pre =X eve , where X pre is the estimated value of the current moment for the next moment; (4.2) Calculate the prediction error variance, P pre =P eve +Q, where P pre is the forecast error covariance; (4.3) Calculate the gain, K = P pre / (P pre +R), where K is the filter gain, (4.4) Combined with the temperature measurement value X of the current scanning cycle, calculate the optimal estimate, X / =X pre +K(XX pre ); (4.5) Error method for calculating the optimal temperature estimate, P / = (1-K)X pre ; (4.6) X / As the actual value of the paint temperature in the current cycle, it is sent to PID control to realize temperature closed-loop control; (4.7) Let P eve =P / , X eve =X / , iteratively performs calculation and control of the next scanning cycle; (4.8) Repeat the above steps 4.1-4.7 repeatedly.

2. The feeding system of the color coating machine in the color coating process according to claim 1 is characterized in that: The pneumatic diaphragm pump feeding system includes a feeding pipeline, a return pipeline, a pneumatic diaphragm pump and a material tray. One end of the feeding pipeline is connected to the constant temperature stirring tank at the paint feeding port, and the other end is connected to the material tray. One end of the return pipeline is connected to the material tray, and the other end is connected to the constant temperature stirring tank at the paint return port. The pneumatic diaphragm pump is arranged on the feeding pipeline.

3. The feeding system of the color coating machine in the color coating process according to claim 2 is characterized in that: A feeding roller and a coating roller are arranged in the material tray, wherein the material tray is set up along the length direction of the feeding roller and the coating roller, the circumferential surface of the feeding roller contacts the paint in the material tray, and the coating roller is arranged at the upper right of the feeding roller, wherein a gap is left between the feeding roller and the coating roller.

4. The feeding system of the color coating machine in the color coating process according to claim 1 is characterized in that: The constant temperature stirring tank is also provided with a cold water inlet and a hot water outlet for adjusting the internal temperature, and a temperature sensor for detecting the temperature of the paint is provided inside the constant temperature stirring tank.

5. The feeding system of the color coating machine in the color coating process according to claim 4 is characterized in that: The top of the constant temperature stirring tank is provided with a feeding port, and the bottom is provided with an emptying port.

6. The feeding system of the color coating machine in the color coating process according to claim 5 is characterized in that: An end cover is also provided on the top of the constant temperature stirring tank, and a pneumatic stirrer is provided on the end cover. The stirring rod of the pneumatic stirrer extends vertically into the constant temperature stirring tank.

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