Coal Age

FEB 2013

Coal Age Magazine - For nearly 100 years, Coal Age has been the magazine that readers can trust for guidance and insight on this important industry.

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bauma preview continued ing late January it was starting to take shape. The open-air site includes eight tower cranes, two mobile construction cranes, 10 mobile cranes, four crawler cranes, three duty-cycle crawler cranes, a large rotary drilling rig, three wheeled excavators, seven crawler excavators, eight wheel loaders, three crawler tractors and loaders, a pipelayer and a telescopic handler, six exhibits from the concrete technology program, two material handlers as well as an articulated truck, a mining-class haul truck and a mining-class excavator. To demonstrate its pass matching capabilities with haul trucks, Liebherr will present the face shovel version of its 350-ton R 9400 mining excavator. With a 22-m�� bucket as standard equipment, Liebherr believes it is the ideal machine for loading a mining truck in the 136 metric ton (mt) class. The kinematics of the productiontailored attachment combined with a mining-optimized bucket shape ensure the highest crowd and breakout forces. Even under tough conditions, Liebherr believes the R 9400���s high digging force will improve bucket penetration and offer high bucket fill factors. The R 9400 follows the Liebherr design philosophy of maximizing the machines performance by improving the efficiency of all individual subsystems. Engineered for optimum serviceability the machine is designed to ensure maximum uptime. Designed for hard-digging applications, the R 9400���s heavy duty 3-piece fatigue-resistant undercarriage provides efficient superstructure weight distribution and reduces ground bearing pressure enabling the necessary stability and reliability. Optimizing electrical, mechanical and hydraulic power distribution, the Litronic Plus System allows for easy control even when simultaneous movements are required. Every attachment cylinder is fitted with the patented Liebherr Electronic Damping System that provides controlled end-cushioning for fast and smooth machine���s motions. Intelligent and power-oriented energy management diverts the pump flow during boom lowering, allowing other cylinder motions to operate unimpeded. The R 9400 is powered by a Cummins QSK50 diesel engine that complies with USA/EPA Tier 2 exhaust emission limits and has a rated output of 1,250 kW (1,675 hp). The electric-motor drive also available is an economically viable alternative in a number of application areas, for instance machines intended for work in arctic regions. The R 9400 has a wide, spacious cab that provides the operator with the comfortable working conditions needed for maximum productivity. Mounted on vibration dampers, it also reduces the noise level and creates a quiet environment that promotes the excavator operator���s own performance. In addition to its excellent ergonomic design, the cab provides maximum protection for the operator. The robust steelwork of lowstress design and the safety-glass windows comply with the FOPS standard and protect the operator against falling material. For maximum safety there are several easily reached emergency stop buttons at ground level, in the cab and in the pump and engine compartments. All machine accesses have been optimized. The R 9400���s upperstructure is accessible via a powered 45�� stairway fitted with handrails and the service drop down flap provides easy access to the main servicing features. Fuel, engine and hydraulic oil, grease, windshield wash water can be refilled and drained from ground level. There are currently more than 30 R 9400 hydraulic mining excavators operating in four countries. The latest R 9400 commissioned in a gold mine in Ghana is the first model in face shovel configuration. February 2013 Volvo Penta Improves Diesel Engines for Underground Mining With nine Tier 2 engines and nine Tier 4i engines, Volvo Penta can now offer the mining industry a complete range of engines approved for underground mining applications. These new engines are not only compliant, they also lessen the demand on mine ventilation systems. In 2011, Volvo was one of the first diesel engine manufacturers to receive stage 3B and Tier 4i certificates for its entire engine lineup. Later, the Volvo Penta 13L Tier 4i diesel engines were the first engines to be certified by the U.S. Mine Safety and Health Administration (MSHA) and the Canada Centre for Mineral and Energy Technology���Mining and Mineral Sciences Laboratories (CANMET-MMSL). With its new extended range of engines for mining applications Volvo Penta has made it easier for manufacturers to provide compliant mining machines and vehicles. The new engine line-up consists of 18 engine variants, nine certified for Tier 2 and nine certified for Tier 4i. The Tier 2 engines are the TAD 941/1340/ 1341/1342/1343/1344VE-series ranging from 300 to 479 hp and the TAD1640/1641/1642VE-B-series which ranges between 551 and 700 hp. Ventilation represents a huge cost for underground mines. With a ventilation rate of around 30 cfm/hp, the Tier 4i engines deliver the maximum ventilation rate available for a conventional diesel engine. The Tier 4i engines in the new range are the TAD1360/ 1361/1362/1363/1364/1365VE-series going from 348 to 551 hp and the TAD1660/1661/1662VE-series between 551 and 700 hp. All of these Volvo Penta Tier 4i engines are equipped with a selective catalytic reduction (SCR) units. The SCR technology is the choice Volvo Penta has made to comply with current and future emission legislation. Since Volvo Penta introduced its first SCR engines in 2006, the benefits for the users have been increased power and lower fuel consumption���by 5% 10% compared with corresponding engines. And since the catalytic converter was designed to last the life of the engine, the Volvo Penta SCR systems haven���t demand any increase in service intervals, or caused any additional downtime. The SCR system is based on high-efficiency combustion which reduces the fuel consumption and results in extremely low levels of particulate matter (PM), but also in high levels of nitrogen oxides (NOx). The exhaust NOx is converted into harmless nitrogen gas and water vapor. This is made possible thanks to the SCR system which automatically injects up to 5% AdBlue, a diesel exhaust fluid, to the exhaust gases. The gases are then passed through a catalytic The new Volvo Penta engine range for mining applications provides outstanding ventilation rates. www.coalage.com 39

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