Powder feed device, especially for powder coating material
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United States of America Patent
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Dec 30, 1997
Grant Date -
N/A
app pub date -
Jul 26, 1994
filing date -
Jul 26, 1993
priority date (Note) -
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status (Latency Note)
Importance
Abstract
A powder feed device, especially for powder coating material, with an injector (2), in which a partial vacuum is created by a feed air stream according to the principle of a Venturi pipe and powder is drawn out of a powder container (10) and transported. An additional air stream can also be added to the feed air stream. In a computer (24), a plurality of predetermined powder feed rates (m) is stored in memory, on a calibration diagram (50), along a first diagram axis, and a plurality of feed air rates (FV) is stored in memory along a second diagram axis, for predetermined total air rates (GV) (feed air and added additional air, if needed). The computer (24) contains a powder rate reference value input (52) to input a selected powder rate reference (m-ref) and calculates the necessary feed air rate (FV) and the necessary additional air rate for this value as a function of the predetermined total air rate (GV), and generates a feed air rate reference value (FV-ref) and an additional air rate reference value (ZV-ref) as a function of the calculation result.
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