JPH0129865B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to the structure of a support device for a strip that prevents and corrects vibrations of a traveling strip and defects in the shape of the strip in a non-contact manner. This relates to an improvement of the fluid pressure pad arranged in the area.

Vibration prevention and shape correction of running strips are strongly required in many fields.
For example, threading a strip between two fixed support points over a relatively long distance, such as supporting a steel strip after gas wiping in a continuous hot-dip galvanizing line, or supporting a steel plate during drying of a painted steel plate. It may be necessary to hold the strips in contact with each other. As a means of supporting the strip between such fixed support points in a non-contact state and preventing the strip from vibrating and warping in the width direction, fluid dynamic pressure or fluid static pressure is applied to the strip surface and the fluid cushioning effect is enhanced. Techniques for supporting strips are known. What is important in such a strip support device is that the fluid ejected from the nozzle does not adversely affect the strip product.

For example, in a strip melt plating line using the gas wiping method, when performing non-contact support for the strip pulled out vertically from the plating bath, a conventional quadrilateral nozzle is used to support the strip in a direction parallel to the direction in which the strip travels. Cooling by the fluid ejected from the strip, or if the ejected fluid is hot air, overheating causes temperature unevenness in the width direction of the strip, causing uneven plating, which is a fatal defect in the product.

The object of the present invention is to solve the above-mentioned problems found in the conventional non-contact control means for strips, to eliminate temperature unevenness in the width direction of the strip surface and the strip itself, and to effectively prevent strip vibrations and C warping. An object of the present invention is to provide a hydraulic pad.

The gist of the present invention is that, in a fluid pressure pad disposed in a non-contact manner with respect to the surface of a running strip, the pad is constructed of a slit that is inclined in a direction parallel to the traveling direction of the strip and a slit that is inclined in a direction parallel to the traveling direction of the strip, or that the slit that is inclined is The hydraulic pad has a polygonal nozzle defined by a slit that is perpendicular to the slit.

The following will explain the structure of the fluid pressure pad of the present invention.

FIG. 1 shows an example in which the present invention is applied to vibration prevention and correction of crosswise warpage (C warp) of a strip drawn out from a plating bath in a continuous hot-dip plating line for steel strip. In FIG. 1, a strip is pulled vertically upward between 1 a plating bath in a plating bath 2, 3 a sink roll 4 in a plating bath 1, and a top roll 5 provided at a long distance above the plating bath 1. , 6 is plating bath 1 of strip 3
A pair of wiping nozzles placed opposite each other immediately after being pulled out from the container. Reference numeral 7 denotes a fluid pressure pad for correcting the vibration and C-curvature of this strip.

FIG. 2 shows a conventional quadrilateral slit hydraulic pad. In this quadrilateral slit, there is a part 8 parallel to the traveling direction of the strip 3, so the ejected fluid directly hits the strip for about 25 to 100 times more time in this part than in other parts, resulting in supercooling and the plating surface. Unevenness 9 occurs.

FIG. 3 shows an example of the polygonal nozzle type fluid pressure pad of the present invention, in which the nozzle is composed of a slit 8a perpendicular to the direction of strip movement and a slit 8b inclined to the direction of movement of the strip. As a result, there are no overcooled portions, and the above-mentioned appearance unevenness 9 is prevented from occurring.

Figure 4 shows a double polygonal nozzle type fluid pressure pad that is adapted from the pad in Figure 3 to accommodate changes in strip width.
In addition to doubling c and 8d, the inside of the pad body is divided as shown in b, and fluid supply means to each slit is provided.
This is an example where Qc and Qs are made independent. When the strip width is between a and b, fluid is flowed only from Qc, and when the strip width is greater than b, fluid is flowed from Qc and Qs, making it possible to control the range of static pressure generation.

FIG. 5 shows another example of the polygonal nozzle type fluid pressure pad of the present invention, which has a nozzle formed with a slit, for example, a diamond-shaped slit, inclined with respect to the direction of strip movement. The effect is no different from the previous example.

The pad of the present invention can be used even in the case shown in Fig. 1, but as shown in Fig. 6, it is used in a box (seal box) 10 in which the position of the pad on the bath surface is controlled in a specific atmosphere. It is also possible.

As described above, according to the fluid pressure pad of the present invention, vibration and C warping of the strip can be prevented in a non-contact manner, and temperature unevenness on the surface of the strip can be completely eliminated.

[Brief explanation of drawings]

Figure 1 is a diagram showing the fluid pressure pad of the present invention arranged in a continuous melt plating line of steel strip, Figure 2 is a diagram showing a conventional type of fluid pressure pad, where A is a front view, B is a sectional view, and Figure 3 is a diagram showing a conventional hydraulic pad. 4 is a diagram showing another example of the fluid pressure pad of the present invention, A is a front view, B is a sectional view, and FIG. 5 is a diagram showing still another example of the present invention. The front view shown in FIG. 6 shows the fluid pressure pad of the present invention placed in a seal box above the plating bath surface. DESCRIPTION OF SYMBOLS 1...Plating bath, 2...Plating tank, 3...Strip, 4...Sink roll, 5...Top roll, 6...Wiping nozzle, 7...Fluid pressure pad, 8...Fluid ejection slit, 9...Irregular appearance of Metsuki, 10...Seal box.

Claims (1)

[Claims] 1. A fluid pressure pad arranged in a non-contact manner with respect to the surface of a traveling strip, which is composed of a slit that is inclined with respect to a direction parallel to the traveling direction of the strip, or is composed of a slit that is inclined in a direction parallel to the direction in which the strip travels, or A polygonal nozzle type fluid pressure pad, characterized in that it has a polygonal nozzle constituted by a slit that is perpendicular to the polygonal nozzle.