| 摘要 |
PURPOSE:To stably control sheet temp. at outlet side without any influence of changing factors, such as passing rate of the steel sheet, cooling water temp., etc., by adjusting cooling water level in water cooling jacket in the cooling method using the water cooling jacket. CONSTITUTION:The cooling water is introduced into the water cooling jacket 1 from supplying hole at downstream side of running course of the steel sheet S and after flowing forcibly as straightening flow along the both side surface of the steel sheet toward reverse direction of the running course of the steel sheet, it is overflowed from the discharging port. In this cooling apparatus, an elevating plate 6 is arranged at the inlet side of the steel sheet for the straight flow plate 1a and elevated by an elevating device 10, composing of such as cylinder 7, rope 8, sheave 9, etc., to change the overflow level in the cooling apparatus 1. A computing element 16 calculates the overflow level in order to make to the aimed sheet temp. from each detecting signal of thermometer 12 for the steel sheet, level meter 13 for the overflow height and thermometers 14, 15 for cooling water and the aimed cooling temp. 17 of the steel sheet and the passing rate 18 of sheet after treatment. The calculating result is inputted into a controlling device 19 and the elevating plate 6 is controlled by the device 10 so as to affairs the prescribed level.
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