SOUTH MILWAUKEE, Wisconsin - Although it is not at liberty to release the name of its customer, BUCYRUS INTERNATIONAL has sold a new 8750 AC walking dragline to a "major" Canadian coal mining company. This dragline, with a contract value in excess of US$100 million, will have a complete AC-IGBT electrical drive system for all motions.
Ultimately the combined drives for the hoist, drag, swing, and walking motions of the 8750 will have over 27.8 MW. When in full operating mode, it will be able to lower its 84.1-cubic-metre bucket to a maximum depth of 76.2 m and drag it until it is filled with nearly 136,500 kg of overburden. The full bucket can then be hoisted to a maximum height of 55.5 m while turning and finally dumping the material 121.6 m away. This machine's operating weight is approximately 7.3 million kg.
Bucyrus, with its partner SIEMENS ENERGY & AUTOMATION, pioneered the use of AC drive systems on mining equipment nearly 30 years ago. Due to the reliability and maintenance-reducing advantages of the AC systems, AC drives have become the norm for heavy excavating equipment in the surface mining industry. Their use on draglines is no exception.
If a dragline is too large for your mine, see the complete range of Bucyrus shovels at www.Bucyrus.com.