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882.00207.00 Chapter 2: Functional Description 18 of 102
Figure 6: Typical Slide Gate Assembly
Each of the diamond gate air cylinders is actuated by a solenoid valve, which is controlled by the
blender controller.
When the solenoid valve is energized, it opens the metering valve cylinder. When the solenoid valve
is de-energized, it closes the metering valve cylinder.
If the power is interrupted to the blender, the metering valves will return to the closed position to
prevent material from over-filling the weigh hopper/mix chamber.
Caution! If the blender is in metering mode with one of the slide gates open, do not open
the front door of the blender!
Weigh Hopper
The weigh hopper on the Slide Gate/Auger blender is used to weigh each batch of material and
includes an air-operated discharge valve. After the batch is weighed and the level sensor in the lower
mix section is uncovered, the valve will open and discharge the batch into the mixer with the
existing blended material. The discharge valve is also provided with a quick disconnect so the weigh
hopper can be removed for cleaning.
On a Slide Gate blender, the weigh hopper rests on each side on a precision cantilever load cell. To
remove the weigh hopper, lift the hopper from the bottom, hold the dump door closed, and slide it
out once clear of the locating tab on the bracket above the load cell.
Once the hopper has been cleaned, reposition it onto the load cell brackets, using care not to damage
the load cells. Position the hopper as close to the center position between the load cells as possible.
Caution! Use care when replacing the weigh hopper, since the load cells are delicate
weighing instruments and can be easily damaged. Do not use force to push in the
weigh hopper. If it is positioned properly, it will slide in very easily.
Note: The safety switch shuts off the air supply to the blender. An open feeder slide
gate stays open and an overflow of the weigh hopper can occur.
Note: Load cells, if damaged, will have to be sent back to the manufacturer for testing
and evaluation.