B - Operations – Transporting – 05 – B
Patent
B - Operations, Transporting
05
B
222/42
B05B 7/12 (2006.01) B05B 7/14 (2006.01) B05B 12/08 (2006.01) B65G 53/66 (2006.01)
Patent
CA 1307774
ABSTRACT A powder feeding system, includes closed loop regulation of powder feed rate. A feed gas is discharged under constant pressure into an enclosed hopper. A valve is disposed to constrict a carrier conduit conveying powder in a carrier gas. A load cell measures the rate at which powder is flowing from the hopper through an intake orifice into the carrier conduit, and a filtered flow rate signal is produced. A first controller produces a reference signal representative of the difference between a set point signal and the flow rate signal. A differential signal is produced corresponding to the pressure difference between the hopper pressure and a carrier conduit pressure taken between the intake orifice and the valve. A second controller produces a control signal representative of the difference between the differential signal and the reference signal. The valve is responsive to the control signal to proportionately constrict the carrier gas stream such as to regulate the powder flow rate. Preferably the time constant of the second controller is faster than the time constant of the first controller.
569630
Garistina Gregory
Gianella Edward P.
Spaulding Mark F.
Garistina Gregory
Gianella Edward P.
Osler Hoskin & Harcourt Llp
Perkin-Elmer Corporation The
Spaulding Mark F.
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