| 摘要 |
<p>PURPOSE: To accurately determine the speed of a steel sheet and the positions of the tip and rear end of a steel sheet in a cooling device in spite of the length of the steel sheet and to control the quantity of cooling water with high accuracy. CONSTITUTION: Based on the present speed of a hot rolled steel sheet 2 and the position information of the tip and rear end of the hot rolled steel sheet 2 which are obtained by counting pulses from a pulse generator 1a for detecting the number of rotation of a finishing mill 1 and the pulse generator 3a for detecting the number of rotation of a coiler 3 for a fixed time, the quantity of the cooling water in the cooling device 6 which is installed between the finishing mill 1 and the coiler 3 is controlled. One or more steel-sheet position detectors 8a-8h are provided between the finishing mill 1 and the coiler 3 and, based on the detected values with these steel-sheet detectors 8a-8h, the present speed of the hot rolled steel sheet 2 and position information of the tip and rear end of the hot rolled steel sheet 2 in the cooling device 6 are corrected and, based on these corrected speed and position information of the tip and rear end of the hot rolled steel sheet 2, the quantity of the cooling water in the cooling device 6 are changed.</p> |
