| 摘要 |
A drill rig includes a base, a drill tower extending from the base, a drill pipe (38) coupled to and supported by the drill tower, and a driving mechanism (54) coupled to the drill tower that moves the drill pipe relative to the drill tower. The driving mechanism includes a rack and a plurality of pinions (66, 70) that engage the rack (74). The drill rig also includes an adjustment mechanism (102) coupled to the driving mechanism, the adjustment mechanism including a plurality of rollers (146) and an adjustment component (106) that moves the plurality of rollers simultaneously toward the pinions to contact the rack. (p 150 138 102 66-, - 0e 0o 0 0 0 0 126 o * .* 1 0 *3 78 0 * 00 114 106 r **** +'108 62- 0 0 122 e e,,o 138 78 00* 70 150' |
