JPH08257487A - Method for supplying coating material in steel sheet coating line - Google Patents

Abstract

PURPOSE: To minimize the amt. of the coating material remaining in a tank after the end of operation and to reduce a coating material cost by determining the deficient amt. of the coating material from the amt. of the residual coating material determined from the consumption of the coating material and the required amt. of the coating material and the required amt. of the coating material of non-coated steel sheets calculated on the basis of the specifications of the steel sheets to be coated. CONSTITUTION: A process computer 16 calculates the required amt. of the coating material for a prescribed number of sheets based on the specifications of the steel sheets A to N to be coated and to be subjected to coating of this time, supplies this amt. to the coating material supply tank 14 and calculates the amt. of the coating material consumed from the number of sheets of the steel sheets A to D subjected to coating up to the present during the course or near the end of the operation. The amt. of the residual coating material in the coating material supply tank 14 is determined from the consumption of the coating material obtd. by adding the inevitable consumption of the coating material generated by tip clogging, overspraying, trial spraying, etc., of the coating material during the operation to this consumption of the coating material. The deficient amt. of the coating material is determined from the amt. of the residual coating material and the required amt. of the coating material of the uncoated steel sheets E to N calculated on the basis of the specifications of the steel sheets to be coated. The tank 14 is replenished with the coating material of this deficient amt.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a coating material supply method capable of constantly supplying an appropriate amount of coating material to a coating device in a coating line for spraying thick steel plates and the like.

[0002]

2. Description of the Related Art A coating line (for example, a primer line) for spraying thick steel plates is shown in FIG.
A spray coating device 3 is installed above, and the paint in the paint supply tank 4 is supplied to this coating device by a pump 5.
The steel plates 6 on the transfer line 1 are coated one by one.

The coating procedure will be briefly described below.
Specifications of the steel plate to be painted this time (painted steel plate) (application area,
The required amount of paint is calculated from the coating film thickness, paint unit, etc.), and that amount of paint is supplied to the paint supply tank 4. After that, the steel plate 6 on the transfer line 1 is sprayed by the spray coating device 3.
I will paint one by one. Then, near the end of the operation, the amount of paint in the paint supply tank 4 becomes less than the required amount due to chip clogging and overspray of the paint generated during the operation, or trial spraying performed prior to the operation. Since there is not enough paint to paint all the steel plates planned this time, paint is supplied again to the paint supply tank and the remaining unpainted steel plates are painted. At that time, conventionally, the amount of the remaining paint in the paint tank cannot be accurately determined, and therefore the operator supplies the paint based on his experience.

[0004]

As described above, in the steel plate coating line, it is necessary to coat all of the steel plates planned this time, but with the amount of paint currently remaining in the paint supply tank, the chips of the paint in operation The amount of paint remaining in the paint tank can be reduced by supplying paint again to the tank because the paint is insufficient due to clogging, overspraying, or trial spraying. However, in the conventional supply method in which the operator judges the amount of the replenishment paint based on experience and supplies it, the paint is excessively supplied. If the coating material is excessively supplied, the coating material remaining in the tank has a high viscosity and solidifies with the passage of time, and becomes unusable.

The present invention has been made in view of such a conventional situation, and in order to prevent the excessive supply of the paint and to use the paint economically without waste, the amount of the paint remaining in the tank is accurately determined. Therefore, it is intended to propose a paint supply method capable of always replenishing the tank with an appropriate amount of paint.

[0006]

SUMMARY OF THE INVENTION The present invention is applied to the case where all the steel sheets planned this time are to be painted, but the paint is supplied again because the amount of paint remaining in the paint supply tank is insufficient. It is a method that can accurately grasp the shortage amount and always supply the minimum necessary paint to the paint tank.The point is that the paint in the paint supply tank is pumped to the steel plate on the transport table. In a steel plate coating line equipped with a spraying device that performs spray coating, calculate the required number of required paints based on the specifications (coating area, coating thickness, paint unit, etc.) of the steel plate to be coated this time. The above paint is supplied to the paint supply tank, and after the start of spray painting, the amount of paint consumed up to the present is calculated from the number of coated steel plates during or near the end of operation, and the amount of paint consumed During ~ The amount of paint remaining in the paint supply tank is calculated from the amount of paint consumed including the amount of paint inevitable that is inevitable due to paint clogging, overspray, test spraying, etc., and the amount of paint remaining and the steel sheet to be coated It is characterized in that the insufficient paint amount is obtained from the required paint amount of the unpainted steel sheet calculated based on the specifications (application area, coating film thickness, paint unit) and supplies the insufficient paint amount to the tank. It is a thing.

[0007]

In the present invention, first, the specification (application area, coating thickness, paint unit, etc.) of the steel sheet to be coated this time and the number of coatings are input to the business computer (upper level), and information from this business computer is input. Based on the above, the process computer calculates the required amount of the required number of paints, and the operator causes the process computer to input the required amount of the paints, and at the same time, supplies the amount to the paint supply tank. In the paint supply tank, the amount of paint corresponding to the total number of paints to be applied this time is stored.

When the paint in the paint supply tank is supplied to the steel plate on the transport table by the pump and the spray painting is started by the painting device, the order registered in the process computer in advance and the sequence from the lower sequencer Sensor o
From the n / off signal, the process computer determines the position of the steel plate on the transfer line. At this time, the distinction between the unpainted steel plate and the painted steel plate is determined by the painting start / completion signal from the lower sequencer.

After the spray coating is started, the amount of paint required to coat all the remaining unpainted steel sheets is calculated by the process computer during or near the end of the operation. In that case, first calculate the amount of paint consumed up to the present from the number of coated steel plates, and use this consumed amount of paint for other causes (clogging of paint chips during operation, overspray, The total amount initially calculated from the consumption paint amount including the unavoidable paint consumption amount caused by trial spraying, etc., the specifications of the coated steel sheet to be coated this time (application area, coating thickness, coating unit, etc.) and the number of coatings. The amount of paint remaining in the current paint supply tank is calculated from the amount of paint required to coat steel plates, and the amount of paint required to coat that number of steel plates is calculated from the number of remaining unpainted steel plates. Then, the residual paint amount is compared with the required paint amount of the unpainted steel plate, and the number of paints that can be applied with the residual paint amount and the paint amount required to paint all the painted steel plates on the line are calculated. Amount of paint required to paint all unpainted steel The lack of paint amount) guidance to the operator. In addition, clogging of paint chips during operation,
The inevitable paint consumption caused by overspray, test spraying, etc.) is an estimated value.

[0010]

【Example】

Example 1 FIG. 1 is a schematic view showing an example in which the present invention is applied to a steel sheet primer line, 11 is a primer line,
12 is a spray coating device, 13 is a paint supply pump, 14
Is a paint supply tank, 15 is a paint supply control system, 16 is a process computer, 17 is a business computer (upper), 18 is a sequencer (lower), 19 is transfer, 20 is a shot blasting line, 21 is a shot blasting device, A to N is the steel plate to be painted this time.

This embodiment illustrates the case where 14 steel plates are coated with a primer, and the steel plate to be coated with the primer is shot blast line 20 as a pretreatment.
The surface treatment is carried out at and is introduced into the primer line 11 via the transfer 19. When applying primer coating to these 14 steel plates, first apply this time 14
The specifications (application area, coating thickness, paint unit, etc.) of one steel plate are input to the business computer (upper) 17, and based on the information from this business computer 17, the process computer 16 per steel plate The necessary paint amount and the necessary paint amount for all 14 sheets are calculated, and the values are input to the process computer 16, and at the same time, the amount is instructed to the paint supply control system 15 and the paint supply tank 14
The required amount of paint is stored in. The required amount of paint per steel plate is obtained by multiplying the paint basic unit X, the plate width W, and the plate length l. The required paint amount of all 14 sheets is obtained by multiplying the required paint amount of each steel plate by the number of sheets.

In the process computer 16, A
~ 14 sheets of steel plate are registered, and the order of registration is
The position of each steel plate in the primer line 11 and the shot blast line 20 can be grasped from the sensor on / off signal from the lower sequencer 18. The process computer 16 also has a function of distinguishing a painted steel sheet from an unpainted steel sheet by receiving a painting start / completion signal from the lower sequencer 18.

When the required amount of paint is stored in the paint supply tank 14, the steel plate on the primer line 11 is successively coated by the spray coating device 12. In the drawing,
Steel plates A to D are painted steel plates, and E to N are unpainted steel plates.

Near the end of operation after the start of coating, in addition to the consumption of only the steel plate, there is a shortage of paint in the paint supply tank 14 due to clogging of paint chips during operation, overspray, trial spraying, etc. The amount of paint remaining in the paint supply tank 14 is confirmed, and the amount of paint required for painting all unpainted steel sheets on the line is determined by the process computer 16. To determine the amount of paint remaining, first find the number of painted steel plates from the painting start / completion signal from the lower sequencer 18, calculate the amount of paint consumed to paint only the steel plate up to the present from that number, and The amount of paint that has been consumed up to the present is the amount of paint that has been inevitably consumed due to chip clogging of the paint during operation, overspray, test spraying, etc. First, the amount of residual paint in the current paint supply tank 14 is obtained by subtracting from the required paint amount of the 14 steel plates stored in the paint supply tank 14. In the process computer 16,
From the previously input required paint amount of each unpainted steel plate, the required paint amount of all remaining unpainted steel plates is obtained. Then, the residual paint amount in the tank and the required paint amount of the unpainted steel plate are compared, and the number of steel plates that can be painted with the residual paint amount and the paint amount necessary for painting all unpainted steel plates on the line, that is, the shortage amount Is calculated, and a signal is sent from the process computer 16 to the paint supply control system 15 to supply the shortage to the paint supply tank 14. In the paint supply control system 15, all the remaining unpainted steel plates can be applied to the paint supply tank 14 based on the signal from the process computer 16, and residual paint is generated in the tank 14 after the completion of the application of all the steel plates. Do not supply an appropriate amount of paint. After that, the remaining unpainted steel sheets are painted again.

[0015]

As described above, according to the method of the present invention, when the paint in the paint supply tank runs short on the steel plate coating line during or near the end of the operation, the amount of the remaining paint in the paint supply tank is reduced. Since it is possible to accurately grasp and supply the appropriate amount of paint, it is possible to use the paint economically by preventing the excess supply of paint, and it is possible to reduce the paint cost. Play.

[Brief description of drawings]

FIG. 1 is a schematic view showing an example in which the present invention is applied to a steel sheet primer line.

FIG. 2 is a schematic view showing an example of a coating line (for example, a primer line) for performing spray coating on a cold rolled steel plate, a galvanized steel plate, or the like.

[Explanation of symbols] 11 Primer line 12 Spray coating device 13 Paint supply pump 14 Paint supply tank 15 Paint supply control system 16 Process computer 17 Business computer (upper) 18 Sequencer (lower) 19 Transfer 20 Shot blast line 21 Shot blasting device A ~ N steel plate

Claims (1)

[Claims] 1. A steel plate coating line equipped with a coating device for spray-coating a paint in a paint supply tank to a steel plate on a carrying table, the specification of the steel plate to be coated this time ( Calculate the required amount of the required amount of paint based on the coating area, coating film thickness, paint unit, etc., and supply that amount of paint to the paint supply tank.After spray coating has begun, during or near the end of operation, coating The amount of paint consumed up to the present is calculated from the number of coated steel sheets, and the amount of paint consumed is added to the amount of paint unavoidable that is caused by clogging of paint chips during operation, overspray, test spraying, etc. Unpainted steel calculated from the amount of paint remaining and the amount of paint required in the paint supply tank based on the amount of paint required and the amount of paint remaining and the specifications of the steel sheet to be coated (coating area, coating thickness, paint unit) A paint supply method in a steel plate coating line, characterized in that the amount of paint deficiency is calculated from the amount of paint required for the plate, and the amount of paint deficiency is supplied to a tank and replenished.