Page 525 - Flipbook_SolidDesignSoutheast2020

ModelBDF-1.5-2 Volumetric Feeder

Background
Specifications for auger type dry solids volumetric feeders
for a given application generally stipulate maximum feed
range output capabilities of 10:1, 20:1, 30:1 or 50:1, which
can be achieved with a single metering auger (or twin inter-
meshing augers) since the variable speed drives of most
auger type volumetric feeders are capable of providing
such speed ranges. However, for the majority of applica-
tions, optimum levels of metering performance are
achieved when the output feed (speed) range for a given
metering auger size is restricted (perhaps to 10:1 or less).
And in such instances, particularly when a high degree of
short-term metering performance is a process require-
ment, more than one metering auger(s) is often necessary.
When a dry solids auger type volumetric feeder is operat-
ing, product discharge pulsates, which to varying degrees,
is common to all type auger feeders, and which pulsations
are directly related to the design and speed of the meter-
ing auger. At lower auger speeds, feed output pulsations
are most pronounced, which may be undesirable for cer-
tain processes; in fact, many modern-day processes
require smoothest possible feed input. And because of
this, processors often operate auger type dry solids feed-
ers at higher speeds; however, operating a metering auger
at high speeds (i.e., in excess of 200 RPM) could create another metering auger size (larger or smaller) has his-
other problems (i.e., heat generation that may adversely torically been the route taken.
affect product characteristics, product degradation and/or
attrition, adhesion, etc.). To enhance very short-term metering performance (even
as short a a fraction of a second), Acrison offers a number
Optimizing the speed range of the metering auger of a dry of uniquely designed metering augers (some proprietary in
solids feeder is always a crucial consideration associated nature) specifically to produce highest levels of short-term
with overall feeder performance, particularly short-term metering accuracy. And although not suitable for all dry
accuracy. Consequently, whenever a specific application solid ingredients, tests utilizing such metering augers
requires a feed range output that is beyond the optimal can be performed (with the actual material) to determine
speed range of a given size metering auger, changing to performance characteristics.

Features/Benefits
• All product contact surfaces are 304 stainless steel, including • The entire feeder is heavy-duty in construction and dust-tight.
all drive shafts and seal components. • The feeder is virtually silent when operating.
• The metering augers are 316 stainless steel. • All non-stainless steel external surfaces are painted with
• The agitators are flange-attached to their respective drive Acrison’s standard (blue color) enamel.
shafts. The metering augers utilize a threaded attachment
to their drive shafts. Optional/Accessory Equipment
• The two discharge cylinders for the metering augers are
mounted onto a common plate that attaches to the feeder’s • Various materials of construction.
feed chamber. • Integral supply hoppers of various capacities (depending
• As standard, the feeder is equipped with a four (4) cubic foot upon product handling characteristics).
vertical supply hopper. • Discharge cylinders equipped with a common right-angle
• The two metering augers are independently driven by downspout.
heavy-duty variable speed AC or DC gearmotors having • Various variable speed controllers, speed ranges and control
either a 10:1, 20:1, 30:1 or a 50:1speed range. modes.
• The two agitators are independently driven by heavy-duty • Quick disconnect construction for ease of cleanout.
constant speed gearmotors powered by AC motors. • Sanitary construction to satisfy FDA and USDA sanitary codes
• All motors are totally enclosed. (includes quick disconnect construction).
• All applicable controls and controllers are mounted in a • High temperature construction.
common NEMA 12 Enclosure furnished separately for
user mounting.

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