Special equipment for quarry operations
At this year’s steinexpo in Homberg, Nieder-Ofleiden/Germany from 03.-06.09.2014, Liebherr from Biberach/Riss presented large items of equipment from the earthmoving programme and, for the first time, also the crawler excavator R 970 SME, and exhibited the mining excavator R 9150 (Fig. 1). The equipment in the 100 tonnes category (130 short tons) had its début at the Minexpo 2012 in Las Vegas/USA and is the successor of the R 984 C. At Homberg it was in a bottom-dump bucket version with a bucket capacity of 8 m3.
In addition, Liebherr showed the mining excavator R 9100 as a backhoe bucket version, which had its début at the bauma trade fair in 2010. The 100 tonnes excavator is equipped with a Liebherr bucket with a nominal volume of 7 m3. The R 9100 is powered by a Liebherr V12 diesel engine, which complies with all USA/EPA emissions regulations and, at the same time, guarantees a high level of fuel efficiency. Together with the efficient hydraulic system, the innovative V12 engine has an output of 565 kW / 757 HP and provides the high breakaway and tear-out forces required.
At the steinexpo 2014, visitors also saw the premier of the new crawler excavator R 970 SME (Fig. 2) with wear protected 4.5 m3 bottom-dump bucket. The bottom-dump bucket is equipped with the new Liebherr Z-type tooth system, which features self-sharpening teeth in order to offer the best penetration over a long period of time. The unit has an operating weight of approx. 80 tonnes and replaces the Super Mass Excavation version of the R 964 C.
The R 970 SME is capable of tear-out forces of up to 370 kN and penetrating forces of up to 500 kN. The use of undercarriage elements from the larger R 976 and the increased ballast weight increase the stability of the R 970 SME. In this way, the excavator can be operated with bucket sizes of up to 5 m3. The Liebherr V8 diesel engine delivers 330 kW / 449 HP and complies with the exhaust emission requirements of Stage IIIB/Tier 4i.
With the L 586 (Fig. 3), Liebherr presented at Homberg the largest hydrostatically driven wheel loader in the world. The machine is equipped with a 5.5 m3 rock shovel and tyre protection chains. It weighs 31 380 kg in its standard version and achieves a tipping load of 20 430 kg. With a 6-cylinder diesel engine from Liebherr, the L 586 has a performance of 250 kW/340 HP.
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