| 摘要 |
<p>PURPOSE:To eliminate the cooling errors of steel products and to produce the steel products having stable quality by calculating the actual pass time of a coolig zone by using steel sheet detectors and controlling a water spraying rate in accordance with the difference between the calculated pass time and the predicted pass time. CONSTITUTION:The steel sheet detectors 3 are disposed in the cooling zone to detect the front or rear part of a strip; at the same time, the actual pass time of coolers 51-53, 61-63 is calculated from the pass time between the respective detectors. The calculated pass time and the predicted pass time are compared in a speed correcting circuit 14 and the water spraying rate is so determined that the target temp. error after cooling by the difference between both is made zero. The number of valves for water spraying is then controlled with a spraying rate control circuit 13 in accordance with the determined water spraying rate. The temp. errors after cooling of the steel products are thus made substantially zero and the steel products having the uniform quality are obtd.</p> |
