JPH07102327A - Gas cooling device for steel strip - Google Patents

Abstract

PURPOSE:To uniformly cool a steel strip by arranging plural pieces of nozzles for ejecting cooling gas along the longitudinal direction of the steel strip and displacing the position of a partition plate in each nozzle, at the time of cooling the steel strip shifted while continuously annealing by the ejection of the cooling gas. CONSTITUTION:At the time of shifting the long steel strip 1 continuously annealed to the vertical direction, the gas for cooling is blown on the surface of the steel strip 1 from a gas cooling device 6 having plural nozzles A, B, etc., in the longitudinal direction of the steel strip 1 and the steel strip surface is cooled. In this case, the position of the partition plate 5 in each nozzle A, B is displaced in the width direction of the steel strip 1, and by this method, the position in the steel strip 1 surface excess-cooled is changed with the partition plate 5, and the defective shape and the bulging of the steel strip caused by uneven cooling can be prevented because the temp. distribution in the width direction of the steel strip 1 is uniformized.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a steel strip gas cooling device provided in a steel strip continuous annealing facility.

[0002]

2. Description of the Related Art In a cooling method using a gas jet cooling device located at opposite positions with a steel strip in between, a partition plate 5 as shown in FIG. 3 is generally provided for the purpose of cooling in the width direction according to the plate width. A cooling gas flow rate adjusting valve 3 is installed in each duct (Japanese Patent Laid-Open No. 60-169524). In this case, the plate temperature distribution in the width direction is affected by the partition plate as shown in FIG. 4, so that the plate temperature distribution in the plate width direction becomes non-uniform.
The steel plate 1 moves in the direction perpendicular to the paper surface, and the gas jet cooling device is arranged on the front and back surfaces of the steel plate, but one is omitted in FIG.

[0003]

By the way, since the steel strip having the temperature profile as shown in FIG. 4 collapses the plate shape, there is a problem that the steel strip tends to buckle when riding on a cooling roll or a hearth roll in the cooling zone or a defective shape. There was a problem such as occurrence. An object of the present invention is to provide a gas cooling device for a steel strip, which solves the above-mentioned problems and is capable of equalizing the plate temperature in the plate width direction.

[0004]

The present invention has a plurality of nozzles along the longitudinal direction of a steel strip, and a partition plate which forms a plurality of small ducts in the width direction of the steel strip within each nozzle. In the steel strip gas cooling device, the width direction position of the partition plate forming the small duct is changed for each nozzle.

[0005]

According to the present invention, as shown in FIG. 2, the position of the partition plate is not fixed to one in the width direction, but the position of each nozzle is changed so that the part that is supercooled by the partition plate is Disperse and prevent local plate temperature drop,
The temperature in the width direction of the steel strip can be made uniform.

[0006]

EXAMPLE FIG. 1A is a schematic view showing an example of the present invention. In this way, the widthwise position of the partition plate of each nozzle,
For example, by changing each 100 mm, it became possible to keep the temperature difference in the width direction of the steel strip within 5 ° C. It should be noted that A and B shown in FIG. 1A respectively indicate one nozzle of the gas cooling device, and A and B in FIG. 1B respectively indicate the plate width when each nozzle independently cools the steel strip. Is a graph showing the temperature distribution in the sheet width direction, and A + B is a graph showing the temperature distribution in the plate width direction when the nozzles A and B are simultaneously operated.

As described above, by changing the position of the partition plate of each nozzle in the plurality of nozzles, uniform cooling in the width direction of the steel strip becomes possible.

[0008]

The present invention provides a gas cooling device for a steel strip having a plurality of nozzles in the longitudinal direction of the steel strip and a partition plate forming a plurality of small ducts in the width direction of the steel strip. By changing the position of the partition plate forming the duct in the width direction for each nozzle, it is possible to uniformly cool the steel strip and prevent defective shape and buckling of the steel strip.

[Brief description of drawings]

FIG. 1A is a perspective view showing one embodiment of a gas cooling device of the present invention, and FIG. 1B is a graph showing a temperature distribution due to cooling in a plate width direction.

FIG. 2 is a horizontal sectional view showing an embodiment of the nozzle of the present invention.

FIG. 3 is a horizontal sectional view of a conventional nozzle.

FIG. 4 is a graph showing a temperature distribution in the plate width direction when a conventional gas cooling device is used.

[Explanation of symbols]

 1 Steel Plate 2 Cooling Gas Chamber 3 Gas Flow Control Valve 4 Blower 5 Fixed Partition Plate 6 Gas Jet Cooling Device

Claims (1)

[Claims] 1. A gas cooling device for a steel strip having a plurality of nozzles along the longitudinal direction of the steel strip and a partition plate forming a plurality of small ducts in the width direction of the steel strip in each nozzle. A gas cooling device for a steel strip, wherein a position in a width direction of a partition plate forming the small duct is changed for each nozzle.