| 摘要 |
A mobile drilling rig (1), comprises a wheeled chassis (2), a mounting means (11) for a drilling rig (10) located at a front part (3) of the chassis (2), the mounting means (11) comprising a pair of spaced-apart members (12) rotatably supporting a pair of trunnions (16) extending from opposite sides of a support cradle (17) providing trapping means (23) for engaging slide flanges of a drilling mast (25), with the cradle (17), and hence the mast (25), being rotatable, about the trunnions (16), under the control of a double-acting hydraulic ram (41) connected between the cradle (17) and the front chassis part (3), between an upright or angled, drilling position, and a storage/transportation position, and with the mast (25) being slidably advanceable with respect to the cradle (17), to its drilling position, and slidably retractable with respect to the cradle (17), to its storage/transportation position, by a double-acting hydraulic ram (40) connected between the cradle (17) and the mast (25), a hydraulic motor (29) mounted on a carriage (30) which is also slidably trapped to the mast (25), with the motor (29) being adapted, in use, to drive a drill rod forming part of a drill string, and with means (31 - 33) to advance the carriage (30) along the mast (25), in a drilling direction, and to retract the carriage (30) along the mast (25) for insertion of a fresh drill rod, with a reversal of this procedure to retract a drill string. |
