Caterpillar Global Mining Equipment LLC

Caterpillar Inc.

Prasana R

Charles Taylor Hudson

Elangovan Umapathy

Anand S P

Elangovan U

A hydraulic tensioning system is associated with a wire rope feed system of a drilling rig for applying tension to the hoist and pulldown ropes during hoist and pulldown operations. The hydraulic tensioning system includes a hydraulic tensioning circuit with a hoist hydraulic circuit directing hydraulic fluid to a hoist actuator applying tension to the hoist wire rope and a pulldown hydraulic circuit directing hydraulic fluid to a pulldown hydraulic actuator applying tension to a pulldown wire rope. A hydraulic control valve can selectively direct flow to the hoist and pulldown hydraulic circuits.

Rope tensioning system for drilling rig

A rotary drilling rig includes a vertical mast and a rotary head that can vertically move along the mast with respect to a work surface. To move the rotary head along the mast, a hydraulic feed actuator is connected with the rotary head via a wire rope feed system including a hoist rope and a pulldown rope. To maintain the hoist and pulldown ropes in tension and prevent them from dislodging from the respective pulleys of the wire rope system, the hoist and pulldown ropes can be connected to respective hoist and pulldown tensioning actuators. The hoist actuator can be associated with a hoist hydraulic circuit and the pulldown tensioning actuator can be associated with a separate pulldown hydraulic circuit.

A system for controlling an operation of a hydrostatic circuit of a work machine includes a flush control valve. The flush control valve is configured to be fluidly coupled to the hydrostatic circuit. The hydrostatic circuit is configured to operate in at least two operating modes to supply fluid power to selectively run a plurality of sub-systems of the work machine. In at least one operating mode of the at least two operating modes of the hydrostatic circuit, the flush control valve is configured to move and regulate a flushing flow rate of the fluid to equalize the flushing flow rate with a desired flushing flow rate based on a signal indicative of the at least one operating mode.

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Chennai, India

Prasana R