Study On The Coiler Tension Control Of Cold Rolling Production Line

On the basis of technical transformation of coiler tension control equipments in continuous pickling line in Shougang qian’an iron&steel company, this thesis thoroughly studies the coiler tension control equipment and digests the related technique. This paper will mainly discuss the tension control of coiler.Firstly, in order to control coiler tension accurately and effectively, controlling the speed of strip steel is a feasible scheme. By the dynamic equation between speed and tension, the paper points out that the dynamic relation is one order system other than integral system used usually. This conclusion sustains the theory of indirect tension control. Secondly, with analysis of the coiler driver system, the mathematic model of the coiler speed system is constructed. Furthermore, the paper acquires the cause and the countermeasure of the undulate tension in the course of forming tension by discussing the compensations of dynamic torque in detail. In the end, tension control of coiler is a time-varying parameter system. As a result, the adaptive control theory is applied on the speed controller. KN adaption of speed controller is related to the coil diameter. By studying the rule of winding steel, this thesis acquires the counter diameter as the primary diameter. Using the rule of mass flow conservation, this thesis monitors and corrects the primary diameter. Therefore, the algorithm of coil diameter is built. the thesis analyses the data acquired in the course of debugging tension control system in continuous pickling line.Using the algorithm of coil diameter and the T400technology board, the toiler tension is nearly constant.