| 摘要 |
<p>PURPOSE:To prevent the generation of the graze of a work roll and material to be tempered by controlling so as to increase the drooping quantity of motor as rolling-down load is reduced in response to the output of a detecting means for rolling-down load. CONSTITUTION:When the increase of rolling-down load is detected with a load cell 29, the signal for controlling an induction motor M13 so as to provide drooping characteristics of speed that the drooping quantity of the induction motor M13 is reduced in accordance with the increase of rolling-down load is given from a line 33 to the discrete contact 25 and given to a speed control circuit 26 through a common contact 24 of a changeover switch 22 with a characteristic control circuit 32. In this way, the induction motor M13 is revolving driven without generating slip between the material 7 to be tempered and the work roll 11, therefore, without generating graze the running speed of the material 7 to be tempered and the circumferential speed of the work roll 11 are kept at the same value.</p> |
