| 摘要 |
<p>PURPOSE:To prevent control of a plate thickness to an extremely small value by holding the output from a rolling-down monitor AGC until the passage of a weld point between a stand and a position where a thickness gauge is installed ends. CONSTITUTION:A weld point is discriminated from whether the output from a BISRA.AGC9 increases in a tightening direction by a prescribed value or above or not during serveral times of sampling period of a pressure monitor AGC. When the increase is disciminated a control command Sc for holding the output from a rolling-down monitor AGC11 is outputted to the AGC circuit 11 by granting that the weld point passes. A control part 30 detects the passage of the weld point in accordance with the input information and calculates the time for the passage of the weld point to the set position of an X-ray thickness gauge 10. The holding of the monitor AGC is released at the point of the time when the passing time is attained and the circuit 11 is returned to an ordinary operating state.</p> |
