CONTROL METHOD OF APPARATUS FOR ROTATING SLAB AND CONTROL SYSTEM THEREOF

A method of controlling a slab turning device used in a rolling line having a rolling mill for rolling a slab heated in a heating furnace. While a preceding slab is being rolled by the rolling mill, the slab turning device holds, lifts, and turns, on the upstream of the rolling mill, a following slab by using holding members (21) of a tongue mechanism system which have holding claws (21a) at four corners of a horizontal base (13). The holding claws (21a) at the front ends of the holding members (21) are closed, with a turning section (15), which supports the holding members (21) of the slab turning device, made to be freely turnable. Force of the closing of the holding claws allows the turning section (15) to freely turn to the same angle as the inclination angle of the slab (S), and this causes all the holding claws (21a) to be in contact with side surfaces of the slab. After that, the side surfaces of the slab (S) are held by the holding claws (21a) of the tongue mechanism. By this, the slab (S) can be stably lifted before being loaded into the rolling mill. Thus, the slab can be stably lifted during a slab turning process before being loaded into the rolling mill, and the turning process can be automated.