| 摘要 |
An earth drilling machine includes a mast, a crown block assembly mounted on the mast top for providing a drilling line having front sheaves, a fast line sheave mounted to a crown block sheave for reeving the drilling line, a drawworks drum, and a traveling frame assembly a midpoint of a width of a drawworks assembly aligned with the fast line sheave. The drawworks drum has a drum axis, the front sheaves are all aligned on a front axis, the fast line sheave and the deadline sheave are both aligned on a back axis, and the traveling sheaves are aligned on a traveling frame axis. The front axis, back axis, and traveling frame axis are parallel to the drum axis. The crown cross over sheave defines a cross over axis and the cross over axis is mounted perpendicular to the drum axis.
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