Control method for wrapper roller of hot-rolled thin strip steel coiling machine

The invention discloses a method for controlling wrapper rollers of a hot-rolled thin strip steel coiler, which comprises the following steps of: when thin strip steel with the thickness of less than or equal to 4mm is produced, presetting a roller gap between a plurality of wrapper rollers before the head of the strip steel is tracked and detected to reach a finishing mill group F1, setting an actual roller gap S + 5mm, setting the actual roller gap when the head of the strip steel reaches a position 20m in front of a pinch roll, and closing the plurality of wrapper rollers by 5mm, the actual nip roll gap S is achieved; after the head of the strip steel is wound on the winding drum by two circles, full expansion is started, the wrapper roller is started for pressure wrapper for 0.7 s and 0.6 s, detection on load current of the winding drum is started, if the current slope rises stably, the wrapper roller is opened in 0.7 s, and if the current fluctuation of the winding drum rises stably without slope, the wr