| 摘要 |
A compactly arranged drilling machine, having all of its components arranged on a single base, is provided. These components comprise a conventional swivel head with hoisting drum, a power means therefor including a constant speed motor, a hydraulic pump driven by the motor, a hydraulic motor driven by the pump, and a drive line from the hydraulic motor to the input shaft of the swivel head. The machine is particularly useful to underground drilling operations in which a saving of up to 40 percent in rock removal, as compared with conventional machines, has been achieved.
|
