Spiral-Screw Conveyors, Mechanic Transfer and Pneumatic Transfer
Mechanical Transfer, although how difficult it may appear and have a
set of patterns, is the most cost-effective solution in terms of
power consumption. Investment cost is high in the long distances,
however, the power consumption is less. In general, it is also used
for transfer at fixed flow rate volumetrically in all pneumatic
transport operations.
Pneumatic transport is the most expensive, but at the same time most
flexible structure, compared to the screw spiral, band and chain
conveyor. Although it is required to operate with a number of
auxiliary instruments and dust separating system, it is the most
preferred transport system thanks to its flexible structure.
Each product transported by air is first mixed with air and then
separated from the air. Although both these operations are difficult,
they are preferred due to their flexible structure. While the mixing
operation is performed by help of air locks, loading stations and
venture, the separation operation is performed by means of filters.
On the other hand, pneumatic means dust, dust separation and
absolute filtering.
Blowers are used as generator of air, the transport source; in other
words, low pressure fans with high flow rate of air are used.
However it seems that the transport is performed by mixing process
pressure air with the product, it requires serious engineering
operation and experience. On the other hand, pressure and vacuum may
also be used in the pneumatic transport processes.
Each product to be transported pneumatically bears different
characteristic. For this reason, density and efficient transport
pressure of each product differs. And this, in turn, differs ways of
transport. If you attempt to transport sugar on a line used for
transport of flour without any modification, your line is doomed to
fail as it may be expected normally. None of the equipment you use
may operate properly. If the process is designed correctly and it is
operated with proper instruments and equipment, you may transport
both sugar and flour on the same line after making parametric
changes in the automation system. This example shows necessity of a
serious infrastructure and concept of experience in the practice.
Vibration Conveyors
It is a transport method especially used in the short-distance
application, line-up operations and packaging systems. They perform
regular transfer operation. In general, they are used for products
with uniform granular size. The medical drug machines and nail line-up
may be shown as example.
