Automatic proportioning and mixing device for powder

The utility model provides an automatic powder batching and mixing device, and belongs to the technical field of hollow glass bead production. Comprising a double-cone mixing machine, and the double-cone mixing machine comprises a charging barrel and a rotating shaft rod; the mixing device further comprises a negative pressure pipeline and a plurality of stock bins; the rotating shaft rod is of a hollow structure and communicates with the interior of the charging barrel. The negative pressure pipeline is used for conveying powder; a discharging pipe is arranged at the bottom of the stock bin, and the discharging pipe is communicated with the negative pressure pipeline; an electronic valve is arranged on the discharging pipe, and a weight sensor is further arranged on the stock bin. According to the utility model, the negative pressure pipeline is used for directly conveying powder raw materials into the double-cone mixer from the stock bin, so that the charging can be completed under the condition of no shutd