| 摘要 |
A novel cutting head, especially taking seabed sample drillings, has two or more counter-rotating, coaxial cutting wheels. To form an approximately round borehole cross section, the wheel diameter reduces to one side. Preferably, the cutter is implemented as a full-width cutter. The cutters are oppositely-rotating, frustrated-conical wheels. Four such wheels (2) are arranged in pairs on drive plates (6), with drive motors above. Spacer plates on the head (1), co-operating with the cutter wheel teeth (5), reduce the drillings to defined maximum grain size. A suction casing extracts the particles through a suction line. Also claimed are: the drilling equipment used, including the shipboard rig; and the corresponding method of seabed drilling. |
