Powder conveying device for online gas-material separation and conveying method thereof

According to the technical scheme, the powder conveying device for on-line gas-material separation comprises a metering mechanism for weighing powder; the control valve body is arranged on the metering mechanism and communicated with the metering mechanism, and a circulating channel communicated with the powder tank is arranged on the control valve body; the control valve body comprises a vertical three-way pipeline, a valve is rotationally arranged in the vertical three-way pipeline, and a driving part for driving the valve to rotate is arranged on the vertical three-way pipeline; and when the metering mechanism is in a closed state, the valve seals and closes the middle pipe on the vertical three-way pipeline. The invention has the advantages that the whole conveying process adopts closed conveying, the problem of dust overflow can be effectively solved, and as the whole conveying process is carried out in a closed environment, the dust cannot overflow, the influence of the dust on the working environment a