INSTRUMENT FOR MEASURING MASS FLOW RATE OF POWDER, AND ELECTROSTATIC POWDER COATING APPARATUS UTILIZING THE SAME

摘要

A miniaturized, inexpensive instrument for measuring the mass flow rate of powder, which is capable of directly outputting the mass flow rate of powder and whose characteristics are not influenced by the kind and physical properties of the powder. The instrument can be easily manufactured, installed, operated, and maintained, and the color can be easily changed. An apparatus for dispensing powder, which is constructed based on this mass flow rate measuring instrument and an electrostatic powder coating system utilizing this supply apparatus and having a high performance and a high effective operation factor are also provided. A gas to be measured, the flow rate of which is regulated, is turned into a thin-layer high-speed gas stream by a dispersion means, powder is cross-dispersed and introduced into a measuring conduit, the differential pressure occurring is measured, and a supply means is subjected to feedback control so that the output of the differential pressure agrees with a set level.