Self-cleaning powder automatic continuous feeding device

The invention creatively provides a self-cleaning powder automatic continuous feeding device which comprises a feeding unit, a self-cleaning unit and a control system for controlling the on and the off of all valves in the feeding unit and the self-cleaning unit; the feeding unit comprises a powder metering tube arranged corresponding to a feeding port of a reaction kettle and a powder feeding binfor feeding into the powder metering tube; gas supply pipelines are respectively communicatively arranged on the powder feeding bin and the powder metering tube, and a pneumatic balance pipeline is arranged between the gas supply pipelines of the powder feeding bin and the powder metering tube. The self-cleaning powder automatic continuous feeding device creatively provided by the invention has the advantages that automatic feeding is realized by controlling the actions of all the valves by the control system; meanwhile, the possibility of introducing oxygen into a manhole is effectively avoided in a manner of nitrog