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In the midst of the Silverthorn mountain range in the American
state of Colorado lies the Henderson molybdenum mine. Molybdenum is
used in the production of stainless steel, amongst other things.
The mine is situated 2800 m (9190 ft) above sea level, in the heart
of a fertile region teeming with wildlife. There are 3 conveyors in
total, extending over a distance of more than 24 km (15 miles). The
central conveyor PC2 is approx. 17 km (10,5 miles) long. The
installation consists of 4 identical braking systems from Svendborg
Brakes, each positioned between the electric motor and gearbox.
Each system consists of a BSFH 350 - AWA (self-adjusting) brake
with accompanying SOBO hydraulics. The brake systems ensure that
the final conveyor belt does not become overloaded in the event of
an emergency shutdown of the conveyor system. The actual conveyor
belt, on which the brakes have been installed, is by and large
horizontal, with a modest 3-degree incline.
Due to the fact that conveyor PC2 is 17 km (10.5 miles) long and
operated by only one driving station, it makes it the longest
single flight conveyor in the world.
The driving station consists of 4 powerful 2 MW motors, which
together ensure that more than 2500 tons can be transported at a
speed of 22km/hour.
The interconnection and brake regulation feature a specially
designed SOBO system from SoboTech that guarantees gentle,
controllable deceleration in the event of an emergency shutdown,
preventing the conveyor and gearbox being put under strain in a
braking situation, as would otherwise be the case in normal
deceleration without SOBO.
The SOBO system is supplied with full redundancy, which means that
the system will function extremely reliably in any conceivable
situation.
General specifications for the conveyor PC2:
Length: 55,195 feet
Lift: 1,556 feet
Belt width: 48 inches
Speed: 1,200 fpm(max)
Design capacity: 2,500 tph
Installed power: 11,000 HP
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