Control method for shortening rolling pass interval time of reversible rough rolling mill

The invention provides a control method for shortening the rolling pass interval time of a reversible rough rolling mill, and belongs to the technical field of metal pressure machining. The method includes the steps that firstly, when the rolling mill conducts throwing, the rolling mill linear speed and the opening degree of rolling mill outlet side guide plates at the moment are locked, the rolling pass is switched to the next pass at the same time, the rolling mill starts to slow down to the zero speed, and a rolling mill roll gap starts to be pre-positioned to the roll gap preset value of the next pass; and then, the speed reduction time during which the rolling mill slows down to the zero speed, the distance by which a rolled piece is thrown out of the rolling mill and the time required by centering of the rolling mill outlet side guide plates are calculated, centering control of the rolling mill outlet side guide plates is started after the rolling mill conducts throwing and timeis delayed by a specific