DOUBLE ROD CYLINDER FEED SYSTEM

摘要

A hydraulic system for moving a drilling head in a rectilinear motion between a mast crown and a mast table on a drilling machine includes a double rod hydraulic cylinder connected at a bottom end to a mast table and at a top end to a traveling sheave block; first and second flexible connector members for connecting a drilling head to the mast through the sheave block; and hydraulic feed circuitry for actuating the cylinder to move the sheave block and drilling head alternately in a first pulldown direction and in a second pullback direction.