Patent ID: 11959342
Assignee: CATERPILLAR GLOBAL MINING EQUIPMENT LLC
Field: Civil engineering (Other fields)
Classification: CPC E | IPC E

Claim 0:
1. A rotary drilling rig comprising:
a rig frame supported on a work surface;
a mast mounted to the rig frame;
a rotary head movably supported along the mast and operatively coupled to and adapted to rotate a drilling string with respect to the work surface;
a wire rope feed actuator movable with respect to the mast;
a wire rope feed system operatively connecting the rotary head and the wire rope feed actuator, the wire rope feed system including:
a hoist wire rope operatively associated with a hoist tensioning actuator and connected at a hoist rope end to the rotary head; and
a pulldown wire rope operatively associated with a pulldown tensioning actuator and connected at a pulldown rope end to the rotary head; and

a hydraulic tensioning circuit configured to direct hydraulic fluid to the hoist tensioning actuator and to the pulldown tensioning actuator, the hydraulic tensioning circuit including a hydraulic control valve in fluid communication with and configured to selectively direct hydraulic fluid between the hydraulic tensioning circuit and the wire rope feed actuator.