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3. Applications

3.1 Woodchips - Mobile Plough

The very first application for the aeroconveyor was in the woodchips industry in

1981. After 12 years, the conveyors are still running well and its total enclosure has

ensured a great reduction in dust pollution in its immediate environment. The ease of

installation and easy enclosure due to self-supporting structures was impressive and

the saving of costs on support structures was evident to this customer.

Soon afterwards, Aeroconveyors supplied two 40 m conveyors to a manufacturer

stockpiling large quantities of wood chips within an enclosed area. The manufacturer

required a compact system allowing for reduced head room, increased storage

capacity and a clean and smooth operation. Two aeroconveyors below the roof line

were suspended from the roof trusses. Both conveyors were fitted with a mobile

plough (Fig. 1).

Fig. 1: An aeroconveyor mobile plough in operation

The aeroconveyor mobile plough has a low profile as the track section for the plough

is secured to the standard box section. The sideskirts of the plough ensure that the

material is carried free of the box section as these extend past the conveyors

preventing build-up of material on the conveyor structure. The material is removed

from the belt by the floating plough and discharged off either side. An even

distribution of the material is achieved by a bed of rollers in the section where the

belt is flattened. Longitudinal travel of the plough is obtained through its own drive

motor enabling continuous stockpiling of 36 m. The ploughs run parallel to one

another and are manufactured from steel to take the brunt of the wear. The actual

bearing surfaces against the belt, however, are made of Vulealon, a low friction

material normally used on belt cleaners. Also, a special seal beneath one plough

controls the air escape for a smooth operation of the remainder of the aeroconveyor,

after it has moved through the plough.

Eight years later, 10 more conveyors were supplied to this wood board manufacturer

which are incorporated with the existing aeroconveyors, improving and extending the

running of this product. A feature of this installation is the tripper discharge running

at a speed of 1 m/min which functions for the distribution of the product over a 40 m

bunker.

3.2 Chemical Industries: Glassworks and Dust-Proofing

Several applications have taken place in the chemical industry, amongst others, at a

glass-making industry where soda-ash, feldspar and calcite are handled. (These

chemicals are used in the glass-making process). The system starts with the

underground hopper where bottom-opening railway trucks dump the products. A

cross-feed arrangement takes the products to the main conveyor which car- ries it to

138 m high silos. Here a special cross feed shuttle arrangement transports the product

to one of a number of silos. The system can carry up to 120 t/h. There is a convex

curve as well (with a few rollers on the curved section only) to take the conveyor into

the penthouse at the top of the silos.

As a result of the good performance and iow maintenance costs that these conveyors

have incurred, the manufacturer was recently prompted to place another order for 3

more conveyors and a complex shuttle conveyor arrangement.

Probably the most valued asset of the aeroconveyor here is its ability for total

enclosure since there are several food processing plants in this area and the products

being conveyed are powdery. This protection offered by the covered conveyors, i.e.

the protection of the environment from the product or, vice versa, the product from

the elements, has made a profound impression on clients and has played a major role

in influencing their decision in choosing the aeroconveyor as opposed to

conventional or other conveyors.

Environmental conditions and climate are particularly dusty and dry in the Northern

part of South Africa where most of the general industry and mining is to be found

and there has been a substantial increase in the demand for dust preventive measures

and general increased interest in environmental friendly products (for which the

aeroconveyor certainly does qualify).

Aeroconveyors has also found a solution for extreme dustiness including a high-rised

cover on which a dust-extractor may be superimposed positioned at a prescribed

distance form the loading point.

Fig. 2: An aeroconveyor significantly inclined, feeding a set of silos

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