JPH0739799A - Roll positioning method in roll coater - Google Patents

Abstract

PURPOSE:To execute good painting by setting the distance from the present position of an applicator roll to the contact position of the applicator roll with a steel panel corresponding to the thickness of the steel panel and adjusting the position of the applicator to the position immediately before the contact with the steel panel at the start time of painting. CONSTITUTION:In the positioning of the applicator roll 1 before the start of painting of a roll coater, the distance from the present position of the applicator roll 1 to the contact position of the roll 1 with a steel panel 10 or the position where a predetermined gap is formed between the roll 1 and the steel panel 10 is set from the diameter of the applicator roll 1, the thickness of the steel panel 10 and the strain quantity of a backup roll stand 12 due to the tensile force of the steel panel 10 and the position of the applicator roll 1 is adjusted to the position immediately before the contact with the steel panel 10 or the position where the predetermined gap is obtained at the start time of painting. As a result, a coater truck 8 advances in painting start timing to reach a painting position and good painting can immediately be performed and product yield can be enhanced.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for positioning an applicator roll in a roll coater used for manufacturing equipment such as coated steel sheets.

[0002]

2. Description of the Related Art A roll coater as shown in FIG. 1 is known as a coating facility for continuously coating a strip of continuous steel plate or the like. This is composed of two rolls, an applicator roll 1 and a pickup roll 4. The applicator roll 1 and the pickup roll 4 are mounted on the coater carriage 8. At the coating start timing, the coater carriage 8 is moved forward to the coating position by the coater carriage forward / backward moving mechanism 9, and the steel plate 10 is brought into contact with two rolls in a rotatable state. The pick-up roll 4 scoops the paint from the paint pan 7, transfers the paint to the applicator roll 1 with a uniform thickness, and further transfers the applicator roll 1 to the steel plate 10 with a uniform thickness.

In the coating method in which the applicator roll 1 is in contact with the steel plate 10 when the material of the applicator roll 1 is rubber, the applicator roll 1 is reached by the coater carriage forward / backward movement mechanism 9 when the coater carriage 8 reaches the coating position. And the steel plate 10 come into contact with each other, and when the applicator roll 1 is made of steel, a coating method in which a predetermined gap is provided between the applicator roll 1 and the steel plate 10 is a coater carriage forward / backward moving mechanism. The applicator roll 1 is moved by the stepping motor 2 before the start of coating so that a predetermined gap is formed between the applicator roll 1 and the steel plate 10 when the coater carriage 8 reaches the coating position by 9. At the coating start timing, the coater carriage 8 advances to the coating position by the coater carriage forward / backward movement mechanism 9, and the applicator roll 1 moves to a position just before contacting the steel plate 10 or a position where a predetermined gap is formed.

In order to improve the product yield, in the coating method in which the applicator roll is brought into contact with the steel plate, the position of the applicator roll should be adjusted so that the applicator roll and the steel plate come close to each other at the timing of the start of coating. It is desirable to adjust in advance. However, because the material of the applicator roll is rubber, if the applicator roll and the steel plate come into contact with each other while the coater cart is moving forward, the coater cart forward / backward mechanism will cause the coater cart to move forward at high speed. The pressing pressure between the applicator roll and the steel plate fluctuates greatly, and it takes a long time to adjust to the appropriate pressing pressure.Therefore, it is necessary to make sure that the applicator roll and the steel plate do not come into contact at the coating start timing. There is.

Conventionally, the position of the applicator roll is adjusted based on the diameter of the applicator roll and the thickness of the steel plate. However, the strain amount of the backup roll mount due to the tensile force of the steel plate is always present between the applicator roll and the steel plate. There is a corresponding gap. The amount of distortion of this backup roll mount changes in proportion to the total tension from the steel plate, but in the catenary furnace for baking after painting, the unit tension is kept constant in order to adjust the catenary height to a constant level. We are operating under the conditions, for example, in the coating equipment, the steel plate size is 0.27 mm.
~ 1.2mm, the width of the plate is generally 600 ~ 1,250mm, but in this case, the total tension is 1
There is a change of about 0 times, and the strain amount of the backup roll mount also changes about 10 times in proportion to the total tension, which is a non-negligible amount.

According to the conventional method, after the coater carriage reaches the coating position by the coater carriage forward / backward movement mechanism and before the actual coating is started, the applicator roll is moved by the stepping motor so that the gap varies depending on the distortion amount of the backup roll mount. Need dead time. In this case, the moving speed of the stepping motor has a limit to speeding up because it suppresses the fluctuation of the pressing pressure when the applicator roll and the steel plate are in contact, and it takes a long time for the applicator roll to contact the steel plate. This leads to a decrease in product yield.

Further, even in the coating method in which the applicator roll and the steel plate have a predetermined gap, the operator visually confirms the influence of the increment of the gap corresponding to the strain amount of the backup roll base on the coating appearance after the start of coating. Then
Since it is necessary for the worker to finely adjust the gap as needed, it requires a labor-intensive work for the worker and causes a reduction in product yield.

[0008]

SUMMARY OF THE INVENTION The present invention has been made in order to solve the above problems, and in an applicator roll positioning method before the start of coating of a roll coater, the coater carriage reaches the coating position before coating. Move the applicator roll in advance so that the applicator roll and the steel plate come into contact with each other at the time of advancing or a predetermined gap, and the coater carriage advances at the timing of coating start and immediately after reaching the coating position. An object of the present invention is to provide an applicator roll positioning method that enables good coating and improves product yield.

[0009]

The present invention advantageously solves the problems of the prior art, and as a result of the inventors' originality and ingenuity in order to achieve the above object, the coater is applied at the coating start timing. It is possible to improve the product yield by minimizing the time required for a good coating to start after the trolley reaches the coating position, and the gist of the invention is the application of the roll coater before the coating is started. In the troll positioning method, the distance from the current position of the applicator roll to the contact between the applicator roll and the steel plate or the distance to a predetermined gap is backed up by the applicator roll diameter, steel plate thickness and steel plate tensile force. Set based on the amount of distortion of the roll base, and set it so that the applicator roll and the steel plate will be in contact with each other at the beginning of coating or at the specified gap. In applicator roll positioning method and adjusting the position of the applicator roll.

[0010]

Operation and Embodiments The operation and embodiments of the present invention will be described in detail below with reference to the drawings. Fig. 2 shows the backup generated by the tensile force of the steel plate in the coating equipment with the steel plate thickness of 0.3 to 1.2 mm, the plate width of 500 to 1,200 mm, and the unit tension of 3.5 kg / mm ² (constant). An example of the relationship between the strain amount of the roll mount and the plate thickness and plate width of the steel plate is shown. Since the strain amount of the backup roll mount is almost proportional to the total tension of the steel plate, it largely changes depending on the plate thickness and the plate width of the steel plate, as shown in FIG. It was found that the amount of strain of the backup roll mount is about 800 μm and the moving speed of the stepping motor is about 300 μm / sec at the maximum when the total tension is maximum, which is a non-negligible amount.

According to the method of the present invention, the movement amount y of the applicator roll before the start of coating is backed up with the plate thickness of the steel plate and the plate thickness as variables so that the applicator roll and the steel plate have a predetermined gap at the start of coating. Adjust the position of the applicator roll by setting the following formula that includes the amount of distortion of the roll mount. y = L−D / 2−t−g + X (w, t) where L is the coating position of the coater carriage, and the backup roll has no steel plate, from the current position of the center point of the applicator roll to the backup roll. Distance to contact surface D: Applicator roll diameter t: Steel plate thickness g: Gap between the applicator roll and the steel plate at the start of coating (however, when the applicator roll and the steel plate are on the verge of contact, g = 0) w: plate width of steel plate X (t, w): amount of strain of backup roll mount

FIGS. 3 and 4 show a conventional method of coating an applicator roll by contacting it with a steel plate, that is, a method of adjusting the position of the applicator roll from the diameter of the applicator roll and the thickness of the steel plate (FIG. It is a graph which shows the change of the pressing pressure between an applicator roll and a steel plate from the start of coating in 3) and the example (FIG. 4) of the present invention.
In the conventional method, a dead time of about 2 seconds was required to move the distortion amount of the backup roll frame after the coater carriage reached the coating position and before the actual coating was started.
According to the present invention, it is possible to eliminate the dead time until the actual coating is started, and it is possible to perform favorable coating.

The embodiment described above is an example of a method of coating by bringing the applicator roll into contact with a steel plate, but the same applies to the method of coating with a predetermined gap between the applicator roll and the steel plate. The invention can be applied.

[0014]

As described above, according to the present invention,
At the start of painting, after the coater truck reaches the painting position,
Immediate good coating was possible, and it was possible to contribute to the improvement of product yield, and great results could be obtained.

[Brief description of drawings]

FIG. 1 is a schematic view of equipment of a roll coater.

FIG. 2 shows an example of the relationship between the amount of strain of the backup roll mount generated by the tensile force of the steel plate and the plate thickness and plate width of the steel plate.

FIG. 3 is a graph showing a change in pressing pressure between an applicator roll and a steel plate from the start of coating in a conventional method as a comparative example of the present invention.

FIG. 4 is a graph showing a change in pressing pressure between an applicator roll and a steel plate from the start of coating when the present invention is carried out.

[Explanation of symbols]

 1 Applicator roll 2 Stepping motor (for applicator roll) 3 Torque sensor (for applicator roll) 4 Pickup roll 5 Stepping motor (for pickup roll) 6 Torque sensor (for pickup roll) 7 Paint pan 8 Coater truck 9 Coater truck Forward / backward mechanism 10 Steel plate 11 Backup roll 12 Backup roll mount

Claims (1)

[Claims] 1. A method for positioning an applicator roll before the start of coating of a roll coater, wherein the distance from the current position of the applicator roll to the point at which the applicator roll contacts the steel plate or becomes a predetermined gap is the applicator roll diameter and the steel plate. Of the backup roll base due to the sheet thickness and the pulling force of the steel plate, and adjust the position of the applicator roll so that the applicator roll and the steel plate come into contact with each other at the beginning of coating or there is a predetermined gap. Characteristic applicator roll positioning method.