About BREVINI
Brevini UK headquarters are located in Warrington,
Cheshire, at the heart of the motorway network.
Our facilities include 900 sq.m. of offices,
manufacturing and warehousing for the Brevini
products in Warrington and 800 sq.m. of offices
and manufacturing for the PIV Drives helical
products in Scunthorpe, Lincolnshire. We are an
enthusiastic staff with long experience in power
transmissions and we offer a 'solutions based'
approach.
Using advanced software, our engineers are able
to select gearbox units to last the machines total
design life. Our UK stock of standard parts, thanks
to Brevini's modular construction, allows short lead
times for a larger number of variants and sizes.
All of these units are supported by extensive UK
technical expertise.
Each gearbox was powered by a 185 kW,
6-pole, IE3 electric motor that was fitted
with an incremental encoder, thermistors,
space heaters and labyrinth seals. The
6-pole design gives a running speed
of 1,188 rpm, which allowed Brevini to
improve the overall efficiency of the drive
system by using a 2-stage reduction
gearbox.
The encoders were included in the design
to provide feedback and position control
in conjunction with the variable speed
drives (VSDs) to enable load sharing, and
also to prevent any individual drive trying
to operate alone. In this way the drives are
synchronised in their operation and the
design prevents any abnormal loads being
applied that could lead to premature
gearbox wear.
In addition to the main barrel screen drive
units, Brevini also designed and supplied
the feed and discharge screw conveyor
drives that used 37 kW motors connected
to Posiplan gearboxes. Again, the design
was based on efficiency and reliability,
using IE3 motors and the proven Posiplan
drive fitted with labyrinth and cassette
seals.
The electrical control system was designed
and built as a bespoke package that
would maximise the effectiveness of
the drives and improve efficiency. The
system provides complete integration of
the control circuits and ensures safe and
reliable operation of the barrel screens.
This includes a progressive start-up
procedure that minimises the load on the
motors and achieves normal operating
speed within 15 seconds.
The completed trommel was fully
assembled in the Holborne premises
before being tested to ensure that
everything operated as designed. This
required the company to bring in five
generators in order to provide sufficient
power to the machine for the final stages
of the project. Once all the systems had
been verified the vast machine was then
dismantled in preparation for shipping to
Trinidad.
Carl Hanson, Managing Director at
Holborne, commen ts: "This has been
another great project for us that has
also benefitted from the expertise and
flexibility of the Brevini engineers. Their
experience and manufacturing capabilities
have helped to deliver a product that
will provide many years' service in a very
unforgiving application."
www.brevini.co.uk