POWER TONG

摘要

A power tong includes a rotor, driven by a primary drive, for spinning and torquing threaded connections of a tubular gripped in the rotor. A grip in the rotor grips the tubular. A serpentine member supplies power to actuate the grip. The serpentine member is driven by a secondary drive. The primary and secondary drives are mounted on a stator frame. The rotor is rotatably mounted to the stator frame and driven by the primary drive during continuous three hundred and sixty degrees of rotation. A fixed or backup jaw may also be mounted to the stator frame. Tubular grippers on the fixed jaw grip a first side of a tubular joint. The grip on the rotor grips the opposite side of the tubular joint. High torque low-rotational speed applied to the rotor torques the joint. Low torque high-rotational speed applied to the rotor spins the joint.

主权项

1. A power tong comprising:
a rotor supported for rotation about an axis relative to a drive section, the rotor having a first slot extending from a throat on a periphery of the rotor to an opening at the axis; a first gripper carried on the rotor, the first gripper connected to be powered by energy supplied by one or more generators carried on the rotor; a first drive cooperating between the drive section and the rotor, the first drive operable to drive the rotation of the rotor about the axis; a drive loop arranged to follow a path on the drive section, the drive section and path configured to provide a gap such that when the rotor is rotated to a first angle such that the throat and the gap overlap, the drive section and drive loop permit passage of a tubular oriented parallel to the axis through the gap into the first slot; a second drive operable to drive circulation of the drive loop; a plurality of rotational drive elements mounted for rotation on the rotor and angularly spaced apart around the rotor, each of the plurality of rotational drive elements arranged to contact and be driven in rotation by a surface of the drive loop for a range of angles of the rotor, each of the plurality of rotational drive elements coupled to drive at least one of the generators such that the one or more generators are operable to generate power at any angle of the rotor by driving the drive loop whether or not the rotor is being rotated by the first drive.