Coil discharge method for hot-rolled steel coil

The invention discloses a coil discharge method for a hot-rolled steel coil. The method is applied to the technical field of rolled steel. The method comprises the following steps: controlling a coiling drum to carry out primary reverse rotation in a contact state of a carrier roller and the outermost ring of the steel coil, so as to enable the sum of loosened gaps formed through rotation of the n outer rings of the steel coil to be greater than or equal to a predetermined gap value; fixing the tail part of the steel coil to the outermost ring of the steel coil; controlling the coiling drum to carry out secondary reverse rotation in a secondary expansion state in a separation state of the carrier roller and the outermost ring of the steel coil until the current diameter expansion value of the coiling drum is a predetermined difference value greater than the contraction diameter of the coiling drum; and ascending a coil discharge trolley until the carrier roller is in a coil carrying state relative to the stee