Automatic roll feeding device and control method

The invention provides an automatic coil feeding device and a control method. The coil feeding device comprises a coil trolley and a PLC, and further comprises laser ranging equipment arranged on the side of a mandrel. The coiled material trolley is used for horizontally placing the coiled material through a liftable saddle and controlling the vertical position of the coiled material; the running path of the coiled material trolley, the core shaft and the central axis of the coiled material are parallel to one another and are positioned in the same vertical working surface; a photoelectric correlation switch group is arranged at the running path of the coiled material trolley; the PLC detects the specification of the coiled material through the photoelectric correlation switch group and the laser ranging device, measures the distance between the coiled material trolley and the mandrel through the laser ranging device, and controls the coiled material trolley to automatically insert the coiled material to the