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SAS 1SF - Twin Screw Feeder Assy & Control - APRIL 2020
OPERATING PRINCIPLE
TWIN SCREW FEEDER
The D series screw feeders are equipped with a double extracting screw, they guarantee
a homogeneous material flow, high precision and dosing regularity thanks also to the
screws that are machine made for a perfect coupling.
The D series twin screw feeders are designed for the dosing of powdered material and
synthetic fibres. They are available both on volumetric and gravimetric version with an
electronic loading cell weighting system that guarantees high precision and reliability.
They are used in their different configurations in all industrial fields, from concrete to
chemistry, from food to pharmaceutical industry.
The different configurations make them suitable for the use of materials that have very
different granulometry and fluency.
They are available also in configuration for ATEX areas.
A screw feeder makes the function to unload a theoretically constant material quantity on
each turn. This behaviour allows to make a specific load both on the granulometric and
volumetric version. It is expressed in dm³/h and the value is determined by the following
factors:
o
Dosing screw rotating speed.
o
Dosing screw pitch and diameter length.
o
Used product specific weight.
The machine is given with dosage members suitable to guarantee the required capacities
in connection with the material characteristic, as written in the specifications transmitted
by the manufacturer.
The machine dimensions are based on tables obtained by the manufacturer expertise.
For this reason, potential differences of behaviour due to the specific material to be
processed and due to the specific environment cannot be discovered before the test.
In any case, if it is necessary to change some part of the system to change the capacity
or to process different materials from the ones foreseen, consult the manufacturer.
The D-series twin screw feeder is provided completely assembled in one piece with
different dimensions composed by:
o
Hopper
o
2 three-phase induction motors; (Fig.4.A)
o
2 worm reduction gearboxes; (Fig.4.B)
o
A screw feeder body made of stainless steel for containing the material; (Fig.4.B)
o
A mixing paddle chosen between different models to mix the material inside the
screw feeder body (Fig.4.B)
o
Two endless screws for the transport of the material (Fig.4.B)
