| 摘要 |
According to one aspect, a drilling rig carriage (24, 142, 200, 224) is adapted to move along a drilling mast (18, 92, 198, 222), and includes a body structure (146, 178) with electric motors (52a-c, 54a-c, 148a-d, 150a-d, 206a-b, 232a-b) coupled thereto, and pinions (56, 58, 208a-b, 234a-b) operably coupled to the electric motors (52a-c, 54a-c, 148a-d, 150a-d, 206a-b, 232a-b), respectively, optionally having a top drive (26, 100, 143) coupled to the body structure (146, 178). The pinions (56, 58, 208a-b, 234a-b) are adapted to engage racks (36a-b, 158, 160, 162, 164, 204a-b, 230a-b). In another aspect, a drilling mast (18, 92, 198, 222) includes a longitudinally-extending frame (32, 156, 202, 228) having a first side portion (146a) and a second side portion (146b) spaced therefrom. Racks (36a-b, 158, 160, 162, 164, 204a-b, 230a-b) are coupled to the frame (32, 156, 202, 228) at the first side portion (146a). |
