| 摘要 |
A pipeline pig having improved means of sensing changes in the internal configuration of the pipeline through which the pig passes is provided by the invention which employs a pipeline pig body, a radial cup of elastomeric material supported to the body having a circumferential edge which engages the interior of the pipeline, a longitudinally positionable stylus shaft supported coaxially of the body and the cup, the inner end of the shaft providing means to actuate an instrumentation recording device, a transfer plate affixed in a radial manner to the outer end of the shaft rearwardly of the cup, and a plurality of spaced apart sensor members, each formed of a metal rod, the inner end of each of the sensor members being affixed to the body and the outer ends being affixed to the transfer plate, the intermediate portion of the sensor members having an integral coil portion which resiliently deflects the outer ends outwardly, the coil engaging the inner circumferential surface of the cup lip portion so that as an indentation in the pipeline deflects the cup inwardly, the intermediate portion of one or more of the sensor members is also inwardly deflected, pivoting the transfer plate which in turn longitudinally displaces the stylus shaft to provide an indication of such pipeline indentation.
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