DEVICE FOR DETECTING THE POSITION OF A HOT ROLLED STEEL SHEET INSIDE AN ACCELERATED COOLER, CAPABLE OF DETECTING THE POSITIONS OF THE FRONT END PORTION AND THE TAIL END PORTION OF THE HOT ROLLED STEEL SHEET THROUGH THE ROTATIONAL DIRECTION OF A POSITION MEASURING ROLLER

摘要

PURPOSE: A device for detecting the position of a hot rolled steel sheet inside an accelerated cooler is provided to accurately detect the position of the hot rolled steel sheet during cooling in order to reduce overcooling and temperature variation though an efficient cooling control, thereby improving a winding shape and product quality.;CONSTITUTION: A device for detecting the position of a hot rolled steel sheet inside an accelerated cooler comprises a position measuring roller(27), an actuating motor(42), an encoder(50), and a controller(60). The position measuring roller is installed in between transferring rollers which transfer the hot rolled steel sheet to the accelerated cooler. The actuating motor rotates the position measuring roller in a reverse direction to the rotational direction of the transferring rollers. The encoder measures the rotational direction of the position measuring roller. The controller receives the rotational direction of the position measuring roller from the encoder, and then detects the position of the hot rolled steel sheet by determining a point where the rotational direction changes. The actuating torque of the actuating motor can rotate the position measuring roller, but cannot transfer the hot rolled steel sheet. The positions of the hot rolled steel sheet are the entry point of the front end portion of the hot rolled steel sheet, and the exit point of the tail end portion of the hot rolled steel sheet. The change of the rotational direction of the position measuring roller from the reverse direction to the transferring rollers to the same direction to the transferring rollers is determined as the entry of the front end portion of the hot rolled steel sheet to the position measuring roller. The change of the rotational direction of the position measuring roller from the same direction to the transferring rollers to the reverse direction to the transferring rollers is determined as the exit of the tail end portion of the hot rolled steel sheet from the position measuring roller.;COPYRIGHT KIPO 2013;[Reference numerals] (27) Position measuring roller; (42) Actuating motor; (50) Encoder; (60) Controller; (70) Cooling control device