MASS FLOW FEEDER
PEBCO®'s patented Double Bladed Mass Flow Feeder (DBMF) has distinct advantages over other
feeders:
- Promotes mass flow
- Handles large volumes of material
- Requires less power
- Has no vibrating parts
- Operates at a low noise level
- Offers up to 10 to 1 turn down ratio
- Feeds centerline of conveyor belt
- Is ideal for blending
Double Bladed Mass Flow Feeder
Mass Flow Feeders are used in conjunction with mass flow silos. They can provide flow rate in excess of 8,000 TPH,
and can be manufactured in sizes ranging from 24" to 60".
Lime Company Installs Mass-Flow
Feeders
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.