Patent ID: 7257977

Claim:
A thermo-electromechanical system comprising two mutually superimposed devices (A) in respective fireproof shells (A′) with inner burners ( 7 ) of natural gas, able to coil, on a relevant central chuck ( 6 ) by means of couples of input and output rolls ( 2 ), a pre-strip ( a ) with a thickness comprised between 30 and 8 mm from a roughing mill directly connected to a casting line for thin slabs, and subsequently to rotate on themselves and uncoil said pre-strip for allowing the inlet to the following descaler and finishing rolling mill, characterized in that said devices (A) are also provided with outer (4) burners; said inner burners ( 7 ) are able to optimise the temperature of the pre-strip ( a ) to be entered into the finishing roller mill, by means of a suitable control software also provided with an algorithm able to change the flow rate of burners to achieve automatically a steady temperature between the leading and trailing ends of the strip both when coiled and uncoiled or as a function of the kind of steel of pre-strip ( a ) and the properties to be obtained on the finished product; said outer burners ( 4 ) are able to homogenize through a special control software the temperature of pre-strip ( a ) on the whole length thereof from the coiled core to a terminal tail portion ( c ), which remains outside, whereby the complete uniformity of the mechanical and geometric characteristics of the final product, responsive to temperature changes, is ensured; actuating means are provided for the rotation of chucks ( 6 ) of upper and lower devices (A) both when coiled and uncoiled under control of special algorithms of the controlling software to speed up or slow down the coiling of pre-strip ( a ); control means are provided for the speed of said pre-strip ( a ) both when being coiled and uncoiled, consisting of a special process software in order to avoid stretches or compressions of pre-strip, such as to jeopardize the geometric quality of the final product; and means are provided for operating the stop of the chuck ( 6 ) by leaving said tail end ( c ) of pre-strip upon coiling at the outside of said devices (A) and said couples of rolls ( 2 ) for a length comprised between 0 and 800 mm, thus making easier, in the subsequent uncoiling, its entering to the following descaling and final rolling up to the finishing roll train.