Patent ID: 9631869
Date: 2017-04-25
CPC Classifications: F27D,G01G

Claim:
1. A powder supply device for supplying powder in a feed tank to an outside of the feed tank, the device comprising: a powder feed pipe, at least part of which is an expansion/contraction part that expands and contracts in a vertical direction, the powder feed pipe being provided with a powder feed valve and being connected to a top portion of the feed tank and configured to feed the powder into the feed tank; a load cell configured to detect a load from the feed tank; a pressure indicator configured to detect a pressure in the expansion/contraction part; and a controller, wherein the controller calculates a powder weight or a rate of change in powder weight in the feed tank by using a value obtained by performing a subtraction of a value proportional to the pressure in the expansion/contraction part detected by the pressure indicator from the load detected by the load cell and an addition of a value proportional to a rate of change in pressure in the expansion/contraction part, and wherein the controller controls a flow rate of the powder to be fed to the outside of the feed tank by using the calculated powder weight or the rate of change in powder weight.