Study On The Tension Control Of Coiler

On the basis of technical transformation of coiler tension control equipments in continuous pickling line in one domestic steel company, this thesis thoroughly studies the coiler tension control equipment and digests the related technique. The main works are as follows:1. 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.2. 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.3. Tension control of coiler is a time-varying parameter system. As a result, the adaptive control theory is applied on the speed controller. K_N 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.4. 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 T400 technology board, the coiler tension is nearly constant.