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Gravimetric Batch Blenders w/Mitsubishi Control Chapter 2: Functional Description 20
Weigh Hopper Discharge Valve
The weigh hopper discharge valve holds the material until it is dumped into the mixing
section. The cylinder is actuated by a solenoid in the valve stack on the rear of the blender.
In looking at the pneumatic circuit, you can see that the air regulator controls the flow of air
to the valve stack. When the weigh hopper discharge cylinder solenoid valve is not
electrically energized, it will provide air pressure to the air cylinder and hold the shaft in an
extended position, holding the dump valve closed.
When the air cylinder is actuated, the air pressure to the dump valve will be removed, causing
it to open.
The air cylinder on the weigh hopper includes a spring return to allow the cylinder to retract
in the absence of air pressure on the cylinder. This will cause the dump valve to open.
Caution! The pneumatic system used on the Slide Gate/Auger blender, like all
pneumatic systems, is highly sensitive to oily, dirty, wet or contaminated
air. If oil, dirt, water, or any other air-borne contaminates enter the system,
the components could be damaged and injury to the operator could result.
A proper air supply must be supplied to the blender.
When the safety circuit is disabled, the air pressure to the cylinder will drop off by shutting
off all the air supply to the valve stack with the pilot operated master air valve. This will also
cause the weigh hopper discharge door to open.
Mix Chamber
All of the batch blenders are equipped with an integral mix chamber. The mix chamber holds
multiple batches of material so any variations in a batch are averaged over time.
Opti-Mixer™
The Opti-mixer™ is designed to provide bi-directional mixing action and can be easily taken
apart for cleaning. This design is standard on all Slide Gate blenders, and is optional on all
Auger models.
“HC” Mixer
The “HC” Mixer features an open wheel design and is best used for multiple regrind
materials and rigid pellets. It is standard on all Auger models.
WARNING!
Never reach into the mix section of the blender without disconnecting the power or air
supply.
WARNING! Serious injury can result from getting your hand caught in the rotating mixer!