| 摘要 |
The arrangement comprises a bottom plate (6) which contains a lifting and locking unit (3). THis is able to grip and move a drilling tube (7). The unit (6) supports two towers (4) and (5). THese are able to move sideways or rotate. Each has a lifting/rotation unit (2) and (1) respectively. The units (1, 2, 3) and towers cooperate to position the tube lengths (7) and screw them together. |
