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Note the 40-ton CAT wheeled dozer at lower left for size comparison. A bucket-wheel excavator (BWE) is a large heavy equipment machine used in surface mining. Their primary function is that of a continuous digging machine in large-scale open-pit mining operations, removing thousands of tons of overburden a day.
A chain trencher cuts with a digging chain or belt that is driven around a rounded metal frame, or boom which resembles a giant chainsaw. This type of trencher can cut ground that is too hard to cut with a bucket-type excavator, and can also cut narrow and deep trenches. The angle of the boom can be adjusted to control the depth of the cut.
The arm provides the up-and-down and closer-and-further (or digging movement) movements. Arms typically consist of a boom, stick and bucket with three joints between them and the house. The principle of a hydraulic excavator. The boom attaches to the house and provides the up-and-down movement. It can be one of several different configurations:
Bagger 288 (Excavator 288), previously known as the MAN TAKRAF RB288 [2] built by the German company Krupp for the energy and mining firm Rheinbraun, is a bucket-wheel excavator or mobile strip mining machine. When its construction was completed in 1978, Bagger 288 superseded Big Muskie as the heaviest land vehicle in the world, at 13,500 tons. [3]
Caterpillar increased the power output of the Cat 3524B EUI 24-cylinder diesel engine used in the 797 from net 2,394 kW (3,211 hp) to net 2,513 kW (3,370 hp) enabling the 797B to achieve a 68 km/h (42 mph) top speed when transporting a 345 t (380 short tons) load, a 3.2 km/h (2 mph) increase over the first generation 797.
Open bowl: usually requires a push-cat (bulldozer or similar) to assist in loading. Elevating scraper: self-loading as it uses an elevator to load material; requires no push-cat. Tandem scrapers: separate tractor and scraper engines provide greater power, and better traction in steep or slippery areas