Powder feeding device

The utility model discloses a powder feeding device, which belongs to a vibratory feeding device and solves the problems of safety hidden trouble, incapability of vibratory screening and absence of thermal insulation treatment of the conventional vibratory feeding device. The powder feeding device, provided by the utility model, comprises a thermal insulation feed cylinder, a weighing device, a support, a storage hopper and a controller, wherein the weighing device is arranged on the support, the upper part of the thermal insulation feed cylinder is connected with the weighing device, and the lower end of the thermal insulation feed cylinder is flexibly connected with the storage hopper; a screen is arranged on the upper end face of the storage hopper, a pneumatic exciter is arranged on the lateral surface of the storage hopper, and the bottom of the storage hopper is connected with a pneumatic rubber tube valve and a discharge pipe; the weighing device is connected with the controller through a cable, the controller is connected with an electric ratio adjusting valve through the cable, the air inlet of the electric ratio adjusting valve is connected with an air source, and the air outlet of the electric ratio adjusting valve is respectively connected with the pneumatic exciter and the pneumatic rubber tube valve. The powder feeding device, provided by the utility model, has the advantages of simple structure, safety and reliability, capability of vibratory screening and remote control of powder falling speed, simple operation, easy transfer, and capability of thermal insulation treatment in a feeding process, and is suitable for adding flammable and explosive powder.