1967-02-01

Development and Manufacture of a 220 Cu Yd Walking Dragline 670746

The surface mining machine discussed in this paper will dig through areas up to 160 ft deep. A dragline was selected for this application after considerable study of the relative merits of shovels and draglines; and a single large machine was selected in preference to two smaller units.
The machine features hydraulic walking equipment of a new design. Horsepowers and pulls on the drag and hoist machinery are larger than on any draglines currently in operation. Six motor generator sets convert 13,800 v incoming a-c power to d-c power with thyristor control.
The boom is subjected to a combination of primary and secondary loads and required special design treatment.

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