| 摘要 |
<p>1. A circuit arrangement for the regulation of the tensile force transferred in the rolled stock between the stages (minimal tensile regulation) and the rolling speed of a mill train comprising m or 4 stages, each of which is equipped with driving means, a speed control unit for each driving means and a control circuit which comprises an actual value calculator (16) for determining the actual values of the torque, which is conditional upon the tension, from the respective values of driving, accelerating and deforming moments, and which comprise a theoretical value calculator (17) for calculating the theoretical values of the torques, which are conditional upon the tension, of each individual stage from the predetermined values of the (specific) tensile stress which is related to the cross-sectional unit of the rolled stock, the roller radius and the cross-section of the rolled stock for each stage, where a correction value for the theoretical value of the speed regulator is formed from the theoretical/actual value comparison of the torques which are conditional upon the tension, and which comprises a superimposed correction regulator which forms a correction value sigma k * which is fed to the theoretical value calculators for the superimposed correction of the theoretical values of the torques which are conditional upon the tension, characterised in that in order to stabilise the rolling speed of the mill train during the transit phase of the rolled stock the speed regulator (4.7) of the last stage (m or 4) is operated by means of a firmly predetermined, uncorrected theoretical value (n*) and the control circuit of the last stage (4.16; 4.17; 32) is designed to be such that on the basis of the theoretical/actual value comparison of the tension-dependent torque (DELTA Mz) of the stage it forms a correction value (sigma k *) for the superimposed control devices assigned to the speed regulators of all stages (1.7 to 4.7), which influences the theoretical values for the output specific tensile force (sigma A *) of the individual stages on the basis of the correction value (sigma k *) in such a manner that the deviation of the tensile force between the penultimate (m-1 or 3) and the ultimate stage (m or 4) is compensated by a predetermined theoretical value.</p> |
