| 摘要 |
A scraping-wheel drill bit comprising a drill bit body (1), a scraping-wheel (2), the drill bit body (1) further comprises a bit leg (3). The scraping-wheel (2) is mounted for rotation on the corresponding journal (6) of the bit leg (3), an outer-ring (4) is deployed on the scraping-wheel (2), wherein: the angular deflection ± of the scraping-wheel (2) is in the range of 20° ‰¤ | ± | ‰¤ 90°. Cutters on the scraping-wheel break rocks by means of successive scraping, thus achieving high rock-breaking efficiency, even wear, high cooling performance, and a longer service life for the cutters, bearings and the drill bit. |
