Plate crossbow correction device and plate crossbow correction method

Abstract

Each of the moving blocks of the plate crossbow correction device includes distance sensors and electromagnets, and plate crossbow is corrected by adjusting electromagnetic force by the electromagnets in accordance with distances to strips. The moving blocks are movable in the horizontal direction and ratios of moving distances of the moving blocks are adjusted to be constant when seen from a central position.

What is claimed is: 
     
         1 . A plate crossbow correction device including:
 a correction mechanism on a front surface side disposed on a front surface side of a conveyed steel plate which adjusts electromagnetic force applied to the steel plate in accordance with a distance to the steel plate and corrects crossbow of the steel plate, and   a correction mechanism on a back surface side disposed on a back surface side of the conveyed steel plate which adjusts electromagnetic force applied to the steel plate in accordance with a distance to the steel plate and corrects crossbow of the steel plate,   wherein the correction mechanism on the front surface side and the correction mechanism on the back surface side respectively comprise   a plurality of moving blocks comprised with distance sensors detecting a distance to the steel plate and electromagnets applying electromagnetic force to the steel plate,   a guide structure supporting the plurality of blocks to be movable along a plate width direction of the steel plate, and   a moving structure moving a moving block close to an end portion of the steel plate from among the plurality of moving blocks along the guide structure and moving the remaining blocks along the guide structure following the moving block close to the end portion of the steel plate.   
     
     
         2 . The plate crossbow correction device according to  claim 1 ,
 wherein the moving mechanism includes   a servomotor and   a rack and pinion mechanism transmitting driving force of the servomotor to the plurality of moving blocks and moving the plurality of moving blocks.   
     
     
         3 . The plate crossbow correction device according to  claim 2 ,
 wherein the rack and pinion mechanism is arranged in that   the gear ratio is determined such that moving distances each of the moving blocks move when seen from a central position of the plate crossbow correction device become a distance which is in accordance with a preliminarily determined stroke ratio.   
     
     
         4 . The plate crossbow correction device according to  claim 1 , further comprising
 a plate edge sensor detecting plate width edge positions which are positions at ends in the plate width direction of the steel plate, and   a control unit controlling moving operations of the moving mechanism such that a moving block close to an end portion of the steel plates from among the plurality of moving blocks opposes the plate width edge position.   
     
     
         5 . A plate crossbow correction device further including
 an overall moving mechanism on the front surface side moving the correction mechanism on the front surface side according to  claim 1  along the plate width direction of the steel plate, and   an overall moving mechanism on the back surface side moving the correction mechanism on the back surface side according to  claim 1  along the plate width direction of the steel plate.   
     
     
         6 . A plate crossbow correction method by a plate crossbow correction device,
 wherein a correction mechanism on a front surface side disposed on a front surface side of a conveyed steel plate which adjusts electromagnetic force applied to the steel plate in accordance with a distance to the steel plate and corrects crossbow of the steel plate, and   a correction mechanism on a back surface side disposed on a back surface side of the conveyed steel plate which adjusts electromagnetic force applied to the steel plate in accordance with a distance to the steel plate and corrects crossbow of the steel plate, respectively include   a plurality of moving blocks comprised with distance sensors detecting a distance to the steel plate and electromagnets applying electromagnetic force to the steel plate, and   a guide structure supporting the plurality of blocks to be movable along a plate width direction of the steel plate,   wherein a moving block close to an end portion of the steel plate from among the plurality of moving blocks is moved along the guide structure and the remaining moving blocks are moved along the guide structure following movements of the moving block close to the end portion of the steel plate.   
     
     
         7 . The plate crossbow correction method according to  claim 6 ,
 wherein the plurality of moving blocks are moved such that moving distances each of the moving blocks move when seen from a central position of the plate crossbow correction device become a distance which is in accordance with a preliminarily determined stroke ratio.   
     
     
         8 . The plate crossbow correction method according to  claim 6 ,
 wherein plate width edge positions which are positions at ends in the plate width direction of the steel plate are detected, and   a moving block close to an end portion of the steel plate from among the plurality of moving blocks is moved to a position opposing the plate width edge position.