| 摘要 |
An improved power-operated drill pipe spinner and an improved combination of a power-spinner and conventional drill pipe tongs are disclosed. The spinner comprises a pair of hydraulically actuated gripping jaws each provided with a power-driven, endless silent chain for spinning a drill pipe section into or out of threaded engagement with a drill string and a hydraulic system for operating the same. The spinner is operatively connected to a pair of conventional pipe tongs having a lever arm and articulated jaws connected thereto. The tong jaws have an open position for receiving the drill pipe section, a latch position in which the jaws engage in non-gripping relation about the pipe and a pipe gripping position in which the jaws grippingly engage the pipe. A hydraulic ram is mechanically connected between the spinner and tongs and in hydraulic circuit with the spinning chain drive to effect automatic shifting of the tongs jaws from the latched position to the pipe gripping position.
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