High-resolution weigher/feeder for fine particulate materials

Fluent material handling – with receiver or receiver coacting mea – With testing or weighing receiver content

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141128, 222 77, 222196, 222 55, 177 50, 177120, B65D 500, G01G 1100

Patent

active

049459570

ABSTRACT:
A highly accurate weighing, feeding and conditioning apparatus for powders and other fine particulate materials is provided. The material is conditioned in a hopper by pulsating inflatable pads within the hopper, or by ultrasonic transmitters mounted on the hopper walls, in apertures in the hopper walls, or on a body at least partially submerged in the fine particulate material. The material is fed by a double auger, one inside the other. In bulk feed mode, both augers rotate at a first, higher speed. In dribble feed mode, only the inner, smaller auger is rotated, at a second, lower speed. This arrangement provides a turn-down ratio of about 500:1. The entire assembly is coupled to a high resolution balance, such as a magnetic force restoration balance, for accurate control of the weight of material fed.

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