Engineering & Mining Journal

MAY 2019

Engineering and Mining Journal - Whether the market is copper, gold, nickel, iron ore, lead/zinc, PGM, diamonds or other commodities, E&MJ takes the lead in projecting trends, following development and reporting on the most efficient operating pr

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BAUMA 2019 HIGHLIGHTS MAY 2019 • E&MJ 43 www.e-mj.com See the latest additions to our IntelliMine suite CIM | Booth 2119 87% Improvement in Bench Elevation Accuracy* 30% Reduction in Shovel Hang Time* 25% Reduction in Unplanned Maintenance* 100 Billion Additional Tons of Optimized Haulage* FLEE T MAINTENANCE MACHINE GUIDANCE COLLISION AWARENESS * Achieved at customer sites Doing More to Deliver More Liebherr Mining Goes Electric Liebherr offered bauma visitors a unique experience, starting a 200-metric-ton (mt) mining excavator live by flipping a giant switch. To achieve this, Liebherr's technical teams had to over- come a huge challenge, routing an electric cable to the excavator that can support the 6,000 volts needed to bring the machine to life, while ensuring an optimal level of safety for the thousands of spectators attending the three daily demonstrations. The R 9200 E has been designed to fully support the re- quirements of the mining industry. With a rated output of 850 kW (1,139 hp), the electric 210-mt R 9200 E balances perfor- mance with environmental consciousness. No exposure of peo- ple and the environment to diesel emissions and noise, longer engine life cycle, and up to 25% less maintenance costs com- pared to a diesel excavator. To reduce starting inrush current, all Liebherr Mining electric excavators are equipped with auto- transformer starting devices to avoid disjunctions of the mine's electric network while starting the excavator. Miners work in the most demanding conditions and the electric drive has its advantages for them, too, Liebherr ex- plained. An electric excavator experiences less power loss than a diesel engine at high altitude and is much easier to start in a cold climate. Liebherr offers a cable reel option for all electric drive ex- cavators. This concept offers better mobility and reduces the manpower required on site (moving the cable). The cable reel is totally autonomous and has a capacity of 245 m to 300 m depending on the excavator type. With all these advantages, it's no wonder that some electric hydraulic excavators, in face shovel and backhoe configuration, have already achieved 70,000 operating hours without any ma- jor maintenance operation on the electric motor. Fitted with a 12.5-m 3 (16.4-yd 3 ) heavy-duty face shovel and patented Liebherr GET to load material with a loose density of 1.65 mt/m 3 , the R 9200 E efficiently loads 65-mt haul trucks in three passes and achieves great cycle times — the fastest measured at less than 20 seconds, Liebherr said. Liebherr R 9200 E with electric drive working in Eurovia's Lausitzer Grauwacke, Germany.

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