M A G U I R E P R O D U C T S , I N C .
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G R A V I M E T R I C A U G E R F E E D E R
PRINCIPLE OF FEEDER OPERATION
The MAGUIRE GRAVIMETRIC FEEDER is a rugged industrial auger feeder designed to meter
precise quantities of color concentrate very accurately into the main flow of virgin material directly
above the throat of your process machine. The two 10" square steel plates, separated by 4 steel
corner posts, form a sturdy, low profile adaptor assembly. This assembly is drilled with the proper
bolt pattern and mounted to the throat of your process machine under the main material hopper.
Natural material flows through the adaptor.
On this adaptor frame, we hang the weighing platform, which then, in turn, supports the hopper
and auger assembly. To ensure accurate weight readings, the hopper assembly does not contact
any stationary part. The ease of removal allows for easy clean-out of the hopper for color
changes. Two butterfly latches allow easy removal of the auger / motor assembly for complete
access to all areas for 100 percent cleanout.
Virgin material flow is visible through the flow chamber, which uses clear acrylic plastic windows
and stainless steel baffles. The baffles direct the flow of natural material so that color is dropped
into the flow from an air space and is evenly distributed over a steady and predictable flow of
natural material. This assures uniform distribution of color into the natural material. The windows
provide a clear operator view of the combined flow.
The hopper holds up to 10 pounds of concentrate. Four sight glasses provide a view of the
material level.
PRINCIPLE OF CONTROLLER OPERATION
The MAGUIRE Gravimetric Controller coupled with two loss in weight load cells, provides the
precise speed regulation and metering control necessary to assure absolute accuracy over your
color usage.
Metering rate is directly related to motor speed or motor run time. Accuracy is obtained by
controlling the exact degree of off-time of the motor. Feed back from the load cells confirms the
actual dispense and motor off-time is then adjusted to assure perfect dispense weights over time.
Though use of a stepper motor, RPM is precisely controlled in increments of 200 steps per
revolution, allowing metering to occur uniformly over the entire screw return cycle (for injection
molding applications) or though continuous operation (for extrusion applications). The metering
rate is constantly monitored and adjusted to maintain accuracy. Changing cycle times or
fluctuations in plant voltage are automatically detected and compensated for with no effect on
metering accuracy.
Summary of Contents for GRAVIMETRIC AUGER FEEDER MGF-ST
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