Rotational flying shears are often used in steel rolling, papermaking and other production lines. In continuous rolling billet workshops or small section steel workshops, it is placed at the back of the rolling line, and the rolling stock is cut to length or only the head and tail are cut. There are various types of flying shears in the transverse shearing unit, heavy shearing unit, galvanizing unit and tinning unit in cold and hot steel workshops, which cut strip steel into fixed lengths or steel coils of specified weight. The widespread use of flying shears is conducive to the rapid development of steel rolling production in the direction of high speed and continuity. Therefore, it is one of the important links in the development of rolling steel production.