| 摘要 |
A coiled tubing injector includes two chains mounted for continuous, opposi ng rotation and aligned to grip between the continuous tubing. Behind a portion of each chain is a straight skate that presses gripper elements on the chain against the tubi ng as it passes between the chains. The skate includes a beam. Rollers are mounted on carriers, and the carriers slide into slots formed on the beam. A resilient pad is placed between the carriers and the beam. The gripper elements roll over the rollers as they are being pressed against the continuous tubing. Dimensional variations in gripper elements, rollers, and the roller carriers that may otherwise cause grippers to be out of alignment are accommodated by compression of the pad. Furthermore, the last roller at each end of each ska te is mounted for pivoting against a spring in order to deflect as gripper elements turn into, or out of, alignment with the skate.
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