JPS6056553B2 - continuous coating machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement in a continuous coating machine that continuously coats and bakes a metal strip with paint.

First, an outline of the conventional continuous coating machine shown in FIG. 1 will be described, and then the present invention will be explained. 1 is a backup role,
2 is a metal strip wound around the backup roll 1, 3
Reference numeral 4 indicates an applicator roll rotatably supported on the support portion of the pedestal 11; 4 indicates a pickup roll rotatably supported on the support portion of the mount 10; and 5 indicates a metering roll rotatably supported on the support portion of the mount 9. It's a roll.

The pedestal 9 is slidably mounted on a pedestal 10, and is slid on the pedestal 10 by a gap adjustment device 6 provided on the pedestal 10 to adjust the gap between the metering roll 5 and the pickup roll 4. The pedestal 10 is placed on the pedestal 11, and the pedestal 10 is adjusted by operating the cap adjustment device 7 provided on the pedestal 11.
1 to adjust the gap between the pickup roll 4 and the applicator roll 3. The pedestal 11 is placed on a quick-open slider 12, and slides on the slider 12 by operating a gap adjustment device 8 provided on the slider 12 to adjust the gap between the applicator roll 3 and the metal strip plate 2. . The quick open slider 12 is
The main body base 13 is slidably mounted on the main body base 13.
communicates with a quick open cylinder 14 provided in the
By operating the cylinder 14, the slider 12 and the rolls 3, 4, and 5 placed on the slider 12 via the frames 11, 10, and 9 are quickly opened. FIG. 3 shows a detailed view of the gap adjustment devices 6, 7, and 8. In this embodiment, a worm mechanism type is adopted, but this can be done using well-known techniques such as a bevel gear type, etc. The same is true even if it belongs to.

In such a conventional coating machine with a roll type, paint is picked up by a pickup roll 4, transferred to an applicator roll 3, wound around a backup roll 1, and coated on a running metal strip 2. be.

However, in the case of a natural coat, the coating method is generally such that the applicator roll 3 is transferred while rotating in the same direction as the running direction of the metal strip 2 and at a speed slower than the running speed. .

In the case of reverse coating, the applicator roll 3 is generally rotated in the opposite direction to the running direction of the metal strip 2 and at a high speed faster than the running speed for transferring. The applicator roll 3 is rubber-lined, and the rubber-lined roll is applied with a preset amount of push while keeping it pressed against the traveling metal strip 2. It had been.

In this case, the rubber lining becomes soft due to the thinner contained in the paint, and the roll diameter tends to increase over time due to this phenomenon.

Furthermore, the damage caused by friction with the applicator roll 3 was severe, and it was necessary to replace the applicator roll with a new one each time. Further, in order to obtain a constant coating, the amount of push of the applicator roll 3 must be adjusted to an appropriate amount of push. Conventional adjustment simply adjusts the amount of push-in, and the push-in amount is maintained at a constant value by setting the pushing force as shown in FIG. However, roll swelling due to thinner)
Since changes in roll diameter and hardness change over time due to the jump, at the beginning of coating, the indentation vs. load curve shown by the solid line A in Figure 4 was given. However, after a certain period of time, the curve changes to a curve having characteristics as shown by a dashed line B.

Moreover, these characteristics vary depending on the history of use of the roll, the thickness of the lining, the material of the rubber, the characteristics of the thinner, etc., and in actual work, it is extremely difficult to maintain a constant pressing force all the time. It was a skill. For these reasons, in the past, operations have been carried out to maintain a nearly constant pressing force by relying on the operator's intuition by observing the required torque of the adjustment shaft, coater drive horsepower, etc.

This invention has been made to address the above-mentioned conventional problems.

However, when considering the actual coating process, the amount of paint adhered to the applicator roll is set to be the same amount depending on various conditions such as the pickup roll conditions, paint conditions, and the running speed of the metal strip. The process of applying the coating from the applicator roll to the metal strip is, in principle, simply a process of smooth transfer.

However, in actual work, it is obvious that the membrane breaks and
Various phenomena such as uneven film thickness, dotted swelling of the coating film, and residual bubbles occur, but unless these conditions are properly satisfied, the quality of the product will be greatly affected.

Furthermore, if an abnormal pushing amount is reached, the mechanical device will require an extremely large transmission force, which will cause damage to the device due to overload acting on various parts of the drive system. Therefore, in order to stabilize the work in the process of transferring paint from the applicator roll to the metal strip, we conducted various experiments and found that the aforementioned product defects, such as film breakage, film thickness unevenness, etc.
Fluids, residual bubbles, etc. can be removed by keeping the line pressure of the part where the applicator roll contacts the metal strip at an appropriate constant pressure.
We have discovered that these drawbacks can be reliably prevented, and based on this, we have developed a mechanism that keeps the pushing force of the applicator roll constant as shown in Figure 2.
Swelling when replacing rolls or due to roll thinner,
A continuous coating machine with extremely high operability that does not require changing settings depending on the thickness of the material to be handled has been achieved.

The following will explain based on the example shown in FIG.
The parts other than the important constituent parts of the present invention are completely the same as those of the conventional device shown in FIG. do.

In FIG. 2, the gap adjustment device between the pickup roll 4 and the metering roll 5 is the same, but the stand 11 of the applicator roll 3 is placed directly on the main body base 13, and the cylinder 15 presses the stand 11 on the main body base 13. The cylinder 15 and the mount 11 or the main body base 1 are provided.
A pressing pressure detecting device (not shown) is provided at the connection with the cylinder 15, and when a change occurs in the preset pressing force, the pressing pressure detecting device is activated, and its detection output signal causes the cylinder 15 to be activated.
The feature is that the pressing force of the applicator roll 3 pressed against the metal band plate 2 wound around the backup roll 1 is always maintained at a constant pressure by operating the hydraulic pressure source.

Furthermore, in order to stabilize the pressing force, the pedestal 11 is designed to reduce frictional resistance by means of wheels 16 attached thereto. The cylinder 15 is also designed to allow a quick open operation to quickly separate the metal strip 2 from the applicator roll 3 when passing through the connection point of the metal strip 2 or when changing the paint. There is.

The installation position of the detection device is between the cylinder 15 and the pedestal 1.
1 or the connecting portion with the main body base 13, but may be any position as long as the pressing force of the applicator roll 3 can be appropriately detected.

For example, a pressure gauge may be provided in the piping system to the cylinder 15. With this configuration, the pressing force of the applicator roll 3 pressed against the metal strip 2 is reduced by the cylinder 15.
The value can be maintained at a constant value at all times, and the intended purpose of the invention can be achieved reliably without the need for adjustments that would otherwise have been made due to changes in treated paint, swelling of the roll, replacement of applicator rolls, etc. can do.

Furthermore, since the cylinder 15 can be used for quick opening at the same time, it is possible to omit the quick opening slider 12 that was conventionally required, and the mechanism can be further simplified, which is extremely effective.

[Brief explanation of the drawings] Figure 1 is a schematic front view of a conventional continuous coating machine;
The figure is a schematic front view of a continuous coating machine according to the present invention, FIG. 3 is a detailed sectional view of a gap adjustment device in a conventional system, and FIG. 4 is a curve diagram of an applicator roll push-in amount versus load in a conventional system. 1...Backup roll, 2...Metal band plate, 3...Applicator roll, 4...
・Zeck up roll, 5...Meetering 7-
6, 7, 8... Gap adjustment device, 9, 10,
11...Roll mount, 12...Quick open slider, 13...Body base,
14...Quick open cylinder, 15.
...Cylinder, 16...Wheel.

Claims (1)

[Claims] 1. A pickup roll and a metering roll are placed on the applicator roll mount via a mount that can be moved and adjusted, and the applicator roll is pressed against the metal band plate that is wound around the backup roll and runs. , equipped with a cylinder and an extrusion pressure detection device that detects its pressing force,
A continuous coating machine characterized in that the cylinder is controlled by the pressing pressure detection device so that the pressing force always remains at a constant value.