Apron Weighfeeder MULTIDOS-VDP
K Apron weighfeeder for
difficult-to-extract bulk solids
K Combination of bin extraction
and feeding ensures low
investment cost
K High-tech direct-weighing
technology ensures high
feeding accuracy
K Self-cleaning extraction plates
K Pin gate can be integrated into
frame
K Particular suitability for
applications in the cement and
steel industries
Application
Particularly in the cement and steel
industries, the need often occurs to
discharge bulk solids which are difficult to
extract, e.g. marl, clay, gypsum, trass or
sludge from bins, and to feed them into
production processes in a controlled
manner.
Until now, apron
conveyors were used for
the purpose, either as a prefeeder for a
weighfeeder, or in purely volumetric
mode.
Schenck apron weighfeeders combine the
two functions of extraction and
gravimetric feeding, thus providing the
following advantages:
K Minimal investment and follow-up cost
(i.e. operation and maintenance cost)
K Easy installation and low space
requirements
K Improved accuracy and higher quality
of the end product compared to
volumetrically operating extraction
apron
conveyors.
Construction
The standard equipment of the apron
weighfeeder comprises:
K sturdy mechanical equipment
K feed hopper with high-adjustable slide
gate
K transport belt
K direct-weighing equipment
K AC geared motor
K frequency transducer
K precabling for easy connection to
electronics
The transport belt consists of overlapping
sheet-metal plates. This shape ensures
smooth extraction of sticky and moist bulk
solids.
The following accessories are available for
different applications:
K pins for the pin gate integrated into the
apron weighfeeder, for shutting off the
feed hopper
K discharge aid roller for homogenising
the material discharge
K scraper
conveyor for removing dropped
material
Working principle
The apron weighfeeder is designed as a
speed-controlled apron
conveyor with
integral direct-weighing equipment for the
determination of the weight of the belt
load. The speed of the circulating belt is
measured with the help of a frequency
transducer.
From these two measured variables, the
actual feed rate is determined. The belt
speed is then controlled as a function of
the control difference (difference between
set point and actual value), so that the
exact feed rate set point is maintained.
Smooth direct extraction of the bulk solid
is ensured by the buckle plate design of
the transport belt and the optimum
feeding cross section of the feed hopper.
The buckle plate belt is guided along a
rail over rollers connected to each other
by means of a chain. This transport rail
includes a weighing rail for determining
the belt load.
At the discharge point, the pockets of the
buckle plates increase thus releasing any
material that has stuck. This self-cleaning
method ensures excellent extraction from
the storage bin, and reduces material
losses underneath the apron feeder to a
minimum.
BV-D2043GB
