Method for detecting and straightening head warping of hot-rolled steel plate

The invention discloses a method for detecting and straightening head warping of a hot-rolled steel plate. The method specifically comprises the following steps that S1, a laser cold detection device is arranged; the laser cold detection device is provided with a first height h1, a second height h2,..., and an nth height hn; and a limit height H; s2, the steel plate moves towards a cooling bed, and when the head of the steel plate shields a signal of a laser cold detection device, an anti-straightening signal is triggered; s3, the PLC control system receives an anti-straightening signal of the limit height H to stop straightening of the steel plate, and an operator manually cuts off the warping part of the steel plate exceeding the limit height H; s4, the PLC control system automatically judges the reverse straightening signal of the nth height hn with the highest execution height; s5, after the head of the steel plate is leveled by the hot straightener, other parts of the steel plate are continuously straigh