Control device for a dragline excavator

A control device for a dragline excavator, comprising hoist and drag rope length increment transducers and revolving platform swing angle transducers responding to the movement of a bucket from its breakout point on the face to the dumping point and from the dumping point to the point where the bucket is lowered onto the face, speed transducers for the bucket hoisting and dragging and revolving platform swinging mechanism, as well as a bucket transportation time calculator and speed setters for the bucket hoisting and dragging and platform swinging mechanisms, associated with said transducers. The device of the invention determines bucket travel times by measuring the hoist and drag rope length increments and the swing angle of the platform, in the presence of limitations on the speeds and accelerations, and then calculates and plots velocity diagrams for the bucket hoisting and dragging and platform swinging mechanisms.