| 摘要 |
<p>A torque reactor for a top drive drilling rig (19) converts reactive torque on the top drive housing (20) into a rotational torque on a torque shaft (31). The torque shaft extends vertically in the derrick parallel with the drive stem (21). A torque case (39) carries two bushings (41,47), one of the bushings receiving the drive stem (21) of the top drive and the other slidingly receiving the torque shaft (31). The drive unit bushing (41) is rigidly connected to the housing (20) of the top drive. The torque shaft bushing (47) will transmit rotational force to the torque shaft (31). Linkages interconnect the bushings. Rotational torque imposed on the drive unit bushing creates a rotational torque in the torque shaft bushing. That torque is transmitted to the torque shaft which is held stationary to absorb the torque.</p> |
