Method for controlling dynamic shearing of hot continuous rolling mill

The invention relates to a method for controlling dynamic shearing of a hot continuous rolling mill. The method comprises the following steps: (1) a pair of flying shears performs shearing to trigger a photoelectric tube to detect band steel; (2) the actual position of the head of the band steel is calculated; (3) the band steel reaches a target value, and the flying shears move; (4) the flying shears start speed control; (5) the situation that the flying shears enter into a tail part shearing position is detected through angles. According to the method, dynamic shearing control is used for variable speed control under the condition of different band steel, and present situations can be effectively improved, so that the operating speed of different band steel is combined for improvement; according to the inherent characteristics of the band steel, stepless speed regulating control is used, the influence of the position of the band steel, the speed and the shearing preposed rate in the process of control is combined, the control mode of using conversion functions is used, and the dynamic control is realized, so that the shearing precision control of different band steel during steel feed at various speeds is satisfied. The method has extensive promotion prospects for improving dynamic shearing precision.