Disclosed is a lump
coal bunker automatic unloading method. The lump
coal bunker automatic unloading method includes the following steps that an ultrasonic wave sensor is added on a portion of an unloading dolly, where a
coal falling groove is located, drop signals fed back by the ultrasonic wave sensor are collected by a
programmable logic controller (PLC) in periodicity mode, and the result that whether the dolly moves or not is confirmed after the drop signals are compared with a set numerical value; when the unloading dolly moves, the PLC sends signals to a coal feeding hand wheel above a belt and enables the coal feeding hand wheel to stop feeding lump coal and a plow unloading
machine of the unloading dolly is uplifted firstly, and then the whole unloading dolly moves forwards; when the unloading dolly moves to the
terminal point of a coal
bunker, the unloading dolly automatically returns to the
initial point of the coal bunker, and the unloading dolly runs in continuous circulation mode. The lump coal bunker automatic unloading method is high in automatic degree, accurate in drop control, and safe, reliable and efficient in run, achieves work environment optimization of employees, prevents the employees from working in a work environment large in
noise intensity and large in dust quantity for a long term, guarantees health of the employees, can guarantee continuity and reliability of production, guarantees that dropping points of the lump coal are located in a prescribed range, guarantees
production rate of the lump coal, and improves economic benefit.