PROPER ENGINEERING LAYOUT
FOR LOADING BELT
CONVEYORS
The Mass Flow Feeder discharges a
continuous rectangular stream of material the same size as the discharge
opening. The PEBCO® Mass Flow Feeder should be centered on the
reclaim belt with the moveable blades parallel to the belt. The discharge
opening is aligned longitudinally with the centerline of the belt. This produces
an improved material profile on the belt. The material is always fed directly
onto the centerline of the belt regardless of the feed rate being provided by
the Double Bladed Mass Flow Feeder.
A conveyor skirt is standard dimensions
with sides and enclosed top should be used under the feeder, and extend 15 feet
downstream from the feeder. The bottom of the PEBCO® feeder
should be as close as possible to the top of the enclosed skirt (usually three-
or four-inches above).
Do not use an additional belt loader or
extend any sides or end plates below the top of the standard skirts as they can
interfere with proper feeder flow to the belt and material profile on the belt.
The feeder blades will provide proper flow onto the belt as long as the feeder
outlet is three- or four-inches above the top of the skirt. The falling material
stream under the skirt at the downstream end of the feeder must be free to move
downstream as it clears the skirt cover. The flow from the downstream end must
be free to form a triangular profile on top of the material from the upstream
end.
PEBCO®'s Double Bladed
Mass Flow Feeders require very little energy to operate. Typically, a five to
ten horsepower hydraulic power unit is all that is required to operate the Mass
Flow Feeder.
The blades on a Double Bladed Mass Flow
Feeder move through a smaller angle for a given opening size or rate of flow.
Thus, allowing a lower discharge rate for the same opening. One of the functions
that controls the discharge rate of the material is the slope of the blades or
blade angle. Because of the requirement to open the blades further for any given
flow than conventional feeding systems, arching and bridging are less likely to
occur at the lower flow rates. Since both blades move, the feeder can attain
larger flow rates before reaching the unstable flow region that has been
experienced with Single Blade Feeders or other mass flow devices.
Double Bladed Mass Flow Feeders can
provide turn down ratios as great as 10 to 1. Flow accuracy can be as good as
+/- four (4) percent.
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