Shivvers® Incorporated, began in 1968 when Charles Shivvers
developed the patented tapered sweep auger, the basis for
the first commercially successful counterflow drying system.
Shivvers® has designed, manufactured, and marketed in-bin
continuous flow drying systems and related products like
fans, floors, spreaders, and controls for over thirty years.
In the early 80's, Shivvers® was the first grain drying company
in the industry to design, patent and market computer controls
for grain dryers. Today Shivvers® continues to lead the industry
with the best, most accurate moisture control on the market,
the CompuDry Command Center.
Shivvers®' Circu-Lator I & II are complete, totally
automated grain handling and drying systems. Wet grain
from the field is unloaded directly into the drying
bin. This grain is dried and automatically transferred
to storage bins which may be located over one hundred
The Circulator System can be easily expanded, fitting
the needs of operations handling from 6,000 to 300,000
bushels per year.
No other drying system can match this combination of built-in
surge capacity, totally automatic drying, and push-button
The Circulator has a built-in unloading auger
which will unload the bin at high speed until the grain
will no longer flow by gravity. At this point, the Tapered
Sweep Auger may be used to continue unloading.
Start your fan, heater and Circulator Fill
the bin to any level with wet grain. The Circu-Trol (control
panel) automatically starts the Circulator when the bottom
layer of grain becomes dry. The Tapered Sweep Auger rotates
around the bin removing dry grain in a thin even layer.
This dry grain is pulled to bin center where
it is elevated to the top by the Center Vertical Auger,
and transferred to the storage bin for cooling by the Continuous
Flow Auger. The Circu-Trol stops the Tapered Sweep when
all the dry grain has been removed, automatically starting
it again when necessary.
The drying process continues around the clock
automatically day and night. Moisture checks three times
a day are all that are required. These may be taken from
the ground, using the Grain Sampling Valve. Circulator owners
operate the system 24 hours a day, without babysitting.
Recirculating Batch Dryer
The Continuous Flow Auger is turned off when the adjacent
storage bins are filled, and the Circulator becomes a Recirculating
Batch Dryer. In recirculation, the dry grain is removed from
the bin floor, elevated up the Center Vertical Auger
and respread on top by the Recirculation Spreader.
The grain is normally dried in two passes when recirculating.
In the first pass the Circu-Trol is adjusted to recirculate
the grain when it reaches 20% moisture content. Wet
grain is then added to the bin, drying as it is filled.
After the bin becomes full, the Circu-Trol
is reset to dry to the desired moisture content in the final
pass. When the bin is c completely dried, the burner is
turned off and the grain is cooled by the drying fan.
The basic Circulator may be initially installed
without the Continuous Flow Auger and operated alone as
a Recirculating Batch Dryer. The Continuous Flow Auger can
be added later, converting the system in a Continuous Flow
The Circulator System has wet holding capacity
as large as the drying bin. Wet grain may be added to the
drying bin at any time - as fast as you harvest. This large
surge capacity lets you harvest rapidly when the going is
good - and stretches out the drying load when weather and
other problems slow you down.