| 摘要 |
An apparatus for pushing a dual diameter pig through a conical reducer attached to a pig trap and into a pipeline includes a frame configured such that the pig rests and moves forward on the frame, which has a front end adapted for attachment to the trap. The vertical position of the frame can be adjusted to align the pig with the conical reducer. An actuator is supported on the frame rearward of, and aligned with, the pig and an actuator control extends the actuator into contact with the rear end of a pig, and also retracts the actuator. The actuator locks to the frame at lock locations spaced along the frame, and the lock locations are separated by a distance that is less than a stroke of the actuator. The pig is pushed into the trap in steps by repeatedly extending, retracting, and moving the actuator forward.
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