In the 1980s, Komatsu introduced its first trolley-assist mining trucks, the 685E and later the 730E-DC. While the 685E is no longer available, Komatsu has complemented the 730E with the new 860E-1K. This new rigid-frame, electric-drive truck was introduced at Minexpo in September 2008. A new size for the company at 280 short tons, it fits nicely between the 830E (at 240 tons) and 930E (at 320 tons). With a GVW of 1,001,700 pounds, the truck is powered by a 2,700-horsepower Cummins QSK60 Tier 2 engine and meets the latest U.S. EPA emissions regulations.
When equipped with the factory-installed trolley system, the new trucks run on either 1,600- or 1,800-volt overhead power lines. After connecting with those lines, the engine rpm lowers nearly to idle and the truck is propelled by the trolley system. Benefits include significant fuel savings, lower emissions, and longer component life.
“Although the trolley infrastructure can cost up to $2 million per mile,” says Don Lindell, product manager for mining trucks, “some mines are in locations where power is inexpensive, so the benefits of trolley operation significantly outweigh the setup costs.”
Komatsu mining trucks (200 tons and up) have always been electric drive. But the 860E-1K marks the first model with a Komatsu-designed drive system and Siemens power-management system. In both trolley and non-trolley applications, the drive system produces a top travel speed of 40 mph, with a 35.52:1 final gear ratio. The liquid-cooled IGBT AC-drive system from Siemens provides many advanced features and a smooth application of torque and traction, according to the company. In addition, the 860E is said to offer outstanding braking power. The “ultra-quiet” dynamic retarding system, capable of 4,650 horsepower, is assisted by four-wheel, wet-disc brakes.
The truck also features a spacious, isolation-mounted ROPS/FOPS cab with improved access systems. It has a five-position, adjustable air seat as well as full-size passenger seat. An integrated electronic dash display provides standard instrument gauges and payload data. The Vehicle Health Monitoring System (VHMS) allows easy access to performance data and is capable of giving technicians more information such as critical faults and pressure checks. It features a secure, easy-to-use Internet interface that doesn't require additional IT infrastructure investment by the mine.
The 860E is scheduled for limited release in 2009 with full-scale production beginning in 2010.
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