Powered guide tubes

Details Powered guide tubes Powered guide tubes

1994-08-04

1997-03-18

Rivell, John

Heat exchange

With alarm, indicator, signal, register, recorder, test or...

Remotely controlled inspection means

165 111, 376249, F28F 2700

Patent

active

056113919

ABSTRACT:
An apparatus for positioning a search device and a retrieval device in a steam generator includes a guide mechanism for guiding the devices through the annulus to the tube sheet and drive mechanisms for driving the cables of the devices. Alternatively, a plurality of guide mechanisms and a plurality of drive mechanisms may be provided for a plurality of search and retrieval devices. The guide mechanism may include two double-dog-leg, single-piece, guide tubes between the handhole and the tube sheet for guiding the cables. The drive mechanisms may each include a pair of pinch rollers for driving a corresponding cable, a remote energizing mechanism for independently energizing the corresponding drive mechanism, and a reversible motor having a drive shaft. One pinch roller is driven by one drive shaft and the other pinch roller freely rotates about the other drive shaft. The guide mechanism may also include a guide plate mounted to the handhole and dual sets of guide tubes for the two halves of the tube sheet. The apparatus may further include a selection mechanism for selecting either half of the tube sheet for positioning the devices thereon. The selection mechanism may include a moving mechanism for moving the drive mechanisms between the halves of the guide plate. The moving mechanism may include a handle mechanism for rotating the drive mechanisms between the halves. A pivot mechanism may be fixedly attached to a holding mechanism, which holds the plurality of drive mechanisms, in order to pivot the holding mechanism about the guide plate.

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