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Conveying
Choosing the correct conveyor lead to excessive
Turning now to the choice of conveyor, below are the main noise and wear.
parameters, advantages and disadvantages applicable to the The main
types of conveyor manufactured by Spiroflow and, of course, advantage of the
those of other suppliers too. flexible screw type is
its inherent simplicity
Flexible Screw Conveyors that results in low
These are often the simplest and lowest cost solution for initial cost, quick
transferring a host of materials from A to B at rates of up to 40 installation times and
tonnes an hour over distances of up to 20 metres. Multiple, low maintenance.
linked units can extend to greater distances as required. Specific models are
Flexible screw conveyors comprise a special heat treated and available for
tempered carbon or stainless steel spiral rotating within an Ultra pharmaceutical, food
High Molecular Weight Polyethylene (UHMWPE) food grade and dairy applications
tube. This type of conveyor suits powdered, granular and flaked that can be safely
materials with a bulk density up to 2.5kg/l. stripped down in
The term ‘flexible’ means that the conveyor can be curved to minutes for thorough
some extent, dependent upon its diameter. This offers the cleaning.
flexibility to route the conveyor around an obstacle between the Wear is only a
inlet and outlet. Normally, only one continuous curve is problem with
Aero-Mechanical Conveyors
recommended. abrasive products
For most applications, the spiral has a round cross section but and life with other materials is almost indefinite. Tubes and
a flat or profiled version can be used for fine materials or for spirals can be easily replaced. Latest developments include
those which are cohesive or have a tendency to smear. abrasion resistant rubber tubes for applications involving
It is desirable to have a head of material in the feed hopper, as aggregates, sand, cement, glass cullet etc.
this assists the elevation of material when starting. This type of Because of the need to maintain product within the conveyor
conveyor is designed to run full of material - running empty will during operation, flexible screw conveyors are not ideal for
30 Solids & Bulk Handling • August 2007
www.solidsandbulk.co.uk
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