Powder feed device, especially for powder coating material

Details Powder feed device, especially for powder coating material Powder feed device, especially for powder coating material

1994-07-26

1997-12-30

Hoge, Gary C.

Conveyors: fluid current

With means to control conveying fluid or movement of load in...

Control of conveying fluid

406 14, 406 28, 406 93, 406153, B65G 5314

Patent

active

057022097

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.

REFERENCES:
patent: 4284032 (1981-08-01), Moos et al.
patent: 4758117 (1988-07-01), Maki et al.
patent: 4941778 (1990-07-01), Lehmann
patent: 5271695 (1993-12-01), Bischof et al.

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