Excavator bucket design pdf Book of World Records. File:Tagebau Garzweiler bei Otzerath Schaufelradbagger Januar2008.
Bucket-wheel excavators have been used in mining for the past century, with some of the first being manufactured in the 1920s. While the overall concepts that go into a BWE have not changed much, their size has grown drastically since the end of World War II. In the 1950s two German mining firms ordered the world’s first extremely large BWEs, and had three BWEs built for mining lignite near Cologne, Germany. 20 buckets, each of which can hold over 15 cubic metres of material.
BWEs have also advanced with respect to the extreme conditions in which they are now capable of operating. Developers are now moving their focus toward automation and the use of electrical power. The bucket wheel from which the machines get their name is a large, round wheel with a configuration of scoops which is fixed to a boom and is capable of rotating. Material picked up by the cutting wheel is transferred back along the boom.
In early cell-type bucket wheels, the material was transferred through a chute leading from each bucket, while newer cell-less and semi-cell designs use a stationary chute through which all of the buckets discharge. A discharge boom receives material through the superstructure from the cutting boom and carries it away from the machine, frequently to an external conveyor system. In the larger BWEs, all three booms are supported by cables running across towers at the top of the superstructure. Beneath the superstructure lay the movement systems.