The belt conveyor is interlocked with the upper belt conveyor when it works in the automatic state. When it operates in the manual state, it is not interlocked with the upper belt conveyor and needs to be operated manually. The anti reverse function of the belt conveyor is completed by the backstop installed by the transmission device. During operation, the belt conveyor has the following protection functions: Coal stacking, anti deviation, emergency stop along the line, smoke, low-speed slip, temperature, electrical fault (overload, short circuit, voltage loss), etc.; during operation, the protection device can automatically set the fault signal of the sensor, perform the corresponding protection operation and display the fault.