Following the launch of the R 9250 excavator
at bauma 2007 and the presentation
of the first shovel version at MINExpo
2008, Liebherr is now making this successful
model available with an electric
drive unit option. Significant fuel price
increases during recent years have led
many mining operations to investigate
alternative energy sources. In designing
this latest option, Liebherr engineers drew
upon many years of experience gained
from the deployment of the company’s
electrical excavators worldwide. In particular,
experience with the R 9350 Electric
has been applied in the development of
the R 9250E. The new model supplies a
nominal motor output of 1,050 kW (nominal
excavator power of 1,100 kW) in
6,000-v and 50-Hz networks. The AC
squirrel cage motor, according to the company,
requires minimal maintenance so
that uptime and machine utilization are
significantly greater. All electrical installations
are protected on IP 55 EN 60529
Standard and the electrical compartments
are sealed and secured to withstand harsh
mining conditions.
The standard version of the R 9250E is
equipped in backhoe configuration with a
9-m gooseneck boom and a 4-m stick. In
face shovel configuration the machine is
equipped with a 6.3-m swing boom and a
4.2-m stick. In both configurations the
machine has a nominal bucket capacity of
15 m3. Bucket capacities are flexible
depending on the material properties and
mine site requirements. Only three bucket
loads are required to load an 80-mt truck,
with four to five bucket loads for a 120-mt
hauler. The first units have been delivered
to Russia and have commenced operation.
www.liebherr.com
As featured in Womp 2009 Vol 10 - www.womp-int.com
