Aggregates Manager Digital Magazine
Issue link: http://read.dmtmag.com/i/248272
Aluminum rollers Aluminum conveyor rollers, from Horizon Conveyor Equipment, are said to offer robust strength at nearly half the weight of their standard steel counterparts. Designed using a 6-mm-thick aluminum tube, the rollers contain a steel shaft and sealed bearings, with the bearing housings manufactured from electrically conductive, glass-reinforced nylon. A large stationary integral stone guard forms the outer primary labyrinth seal, which prevents spillage buildup between the roller and the frame. Dust, debris, and smaller contaminants are kept out by a greased inner cupped lip seal, together with a sealed bearing. Horizon Conveyor Equipment | www.horizonconveyors.co.uk More powerful artics The new Cat C-Series articulated dump trucks, 725C, 730C, and 730C EJ ejector, feature new engines with more power, advanced transmission control, enhanced operator amenities, new serviceability features, and — for the 730C and 730C EJ models — automatic traction control. The design centers on customer requests for increased productivity, lower operating costs, superior availability, long-term durability, added rimpull/retarding capability, ease of operation, and high resale value. The 725C has a rated payload capacity of 26 tons and is powered by a Cat C9.3 ACERT engine rated at 314 horsepower. The 730C and 730C EJ are rated at 31 tons and are powered by a Cat 13 ACERT engine rated at 367 horsepower. All three models are available in Tier 2, Tier 3, or Tier 4 Final configurations. A diesel particulate filter and selective-catalytic-reduction system provide exhaust after treatment for Tier 4 Final models. Compared to prior models, the 725C has a 4-percent gain in gross power and a 20-percent boost in gross torque; the 730C and 730C EJ models have nearly 16 percent more power and more than a 30-percent gross torque improvement. To control speeds on downhill grades, 730C models employ a new engine-compression brake that provides 60 percent more retarding power than predecessor models. The 725C uses a fluid retarder with four operating modes. Caterpillar | www.cat.com Vocational truck The all-new Kenworth T880 is designed for heavy-duty use, including hauling applications. It comes standard with a PAACAR MX-13 engine rated at up to 500 horsepower and 1,850 foot-pounds of torque. The engine provides lightweight, fuel-efficient power for vocational applications. The unit can be ordered with a 116.5-inch BBC hood optimized for the PACCAR engine or with the 122.5-inch BBC hood. The truck features a panoramic windshield for better visibility, quiet cab with triple-sealed doors, a five-piece Metton hood for easier and faster repairs, air-assisted hydraulic clutch, and lightweight, factory-installed lift axles. Kenworth Truck Co. | www.kenworth.com Electric-driven air compressor Doosan Portable Power's new electric-driven VP900e portable air compressor operates between 400 and 900 cfm, without wasted energy. Replacing the typical diesel engine on the air compressor are three onboard electric motors that are controlled by a variable frequency drive system (VFD) — one air end motor and two cooling fan motors. The design creates operational efficiencies, using less power than is required of a typical, one-motor-fits-all design. The VFD monitors the needs of the compressor by changing performance of the motors to meet precise power requirements, preventing the use of unnecessary power. A low power start further enhances energy efficiency as it requires only a fraction of the power typically needed for motor start-up. Doosan Portable Power | www.doosanportablepower.com 14 AGGREGATES MANAGER February 2014