Spiral bevel and double helical gear reduction mixers enable the
most efficient transformation of horsepower into torque. The more torque
available, the greater the ability to mix the contents of a tank. Torque
is horsepower divided by speed, so the higher the agitator shaft speed, at
constant horsepower, the lower the available torque, the lower the mixing
capability. The purpose of a double reduction gearbox is to lower the
agitator shaft output speed and increase torque. Think of a double
reduction gearbox as a magic black box or a large lever arm to leverage your
work load.
The concept of mixer speed is counter-intuitive, in that most think that a
higher speed mixer is what they need. It is for this reason, for flow
controlled applications, that you will mostly see slow speed mixers being applied to
larger tanks and the highest speed mixers are applied to the smallest
tanks.
Double reduction drives typically provide
agitator shaft speeds between 24 to 175 RPM's. Triple gear reductions are
available but are not as common. Due to the numerous number of speed
options, vertical versus right angle drives, mounting options, and gearbox
torque capacities (case sizes) available, these designs do not lend itself to
insertion into a price matrix. Therefore, we'd rather handle these
applications by referring them to the factory.
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