Method and apparatus for measuring powder flow rate
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United States of America Patent
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-
Oct 3, 1995
Grant Date -
N/A
app pub date -
Jul 19, 1994
filing date -
Jul 23, 1993
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A powder flow rate is measured based on a simple construction so as to provide method and apparatus for measuring the powder flow rate for example of a powder coating material, requiring less maintenance cost and facilitating change of color of the coating material. In the method for measuring powder flow rate: a density .rho.1 of the powder within a tank is measured; the powder is drawn out from the tank into a conveying tube; a detecting fluid is blown at a flow rate Qf into the conveying tube a density .rho.2 of the powder in the conveying tube is measured; and a powder flow rate Fm is measured based on an equation of Fm=Qf.multidot..rho.1.multidot..rho.2/(.rho.1-.rho.2). The density .rho.1 of the powder in the tank may be measured by providing a pair of pressure measuring devices at different heights within the tank. The density .rho.2 of the powder in the conveying tube may be measured through a measurement of electrostatic capacity, light transmittance or ultrasonic wave transmittance in the conveying tube.
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