| 摘要 |
A pulling tool for use in a pipe or wellbore has a motor (3) connected to several hydraulically activated levers (5) for forcing drive wheels (4) against an inner surface of the wellbore. A coupling device (2), disposed between the motor (3) and levers (5), has an incoming shaft (12) with sloping surfaces (25) at the end. An outgoing shaft (15) has rollers (24) distributed on an adapter (17) at its end, such that the rollers (24) engage the sloping surfaces (25) on the incoming shaft (12). When a torque is applied to the incoming shaft, a relative rotation between the incoming shaft (12) and outgoing shaft (15) causes an axial displacement of the adapter (17). This axial displacement controls, pistons providing a hydraulic pressure. forcing the levers (5) outwards, thus forcing the wheels (4) against the inner surface of the pipe or wellbore. |
