| 摘要 |
PURPOSE:To detect surely and quickly slip by detecting the field currents of DC motors for un-coiler and coiler. CONSTITUTION:The field currents If1 and If2 of the un-coiling and coiling motors change sharply and simultaneously in the same direction when the slip arises between a material to be rolled and a rolling mill. The detection signal from the current detector 24 of the current If1 is inputted to a differentiator 25 and the detection signal from the current detector 27 of the current If2 is inputted to the other differentiator 28. The signals corresponding to the directions of the change in the currents If1, If2 from differentiators 25, 28 are respectively outputted to a multiplier 26 by which the two signals are multiplied. The output from the multiplier is inputted to a polarity discriminator 29. The polarity of the output from the discriminator 29 changes to (+) when the currents If1, If2 change sharply in the same direction upon generation of the slip. The generation of the roll slip is thus electrically, surely and quickly detected in said direction. |
