After receiving the start-up command, start the early warning (adjustable, set for 10 seconds), start 1 × motor after the end of the early warning, and start 2 × motor after the delay of 3.5 seconds; open the brake after the delay of 1.5 seconds, and then start to pull the coupling scoop (the transmission power of the coupling is proportional to the pull-out distance of the scoop). The two couplings act simultaneously); after the scoop bar reaches the high position, the interlock circuit of the coal feeder is connected, and the coal feeder can be started for operation.