Electricity: measuring and testing – Magnetic – Combined
Patent
1990-05-02
1991-11-19
Snow, Walter E.
Electricity: measuring and testing
Magnetic
Combined
324239, 324262, G01N 2772, G01R 3312
Patent
active
050669133
ABSTRACT:
A ferrous metal detector is used in conjunction with a ferrous metal mandrel of a pilger tooling set in a cold-pilgering machine to sense when the mandrel breaks during operation of the machine. The ferrous metal detector includes a transformer located adjacent to an end of the mandrel. The transformer has a primary winding and a secondary winding positioned along the path of tubing movement through the machine and sufficiently close to one another to be magnetically coupled together by a piece of the ferrous mandrel when located therebetween. The primary winding is excited by a suitable source with a constant predetermined signal which is transparent to non-ferrous metal of the tubing. Such signal couples a constant voltage in the secondary winding. An indicator is connected to the secondary winding for detecting a change in the constant voltage in the secondary winding being the result of an increase in magnetic coupling between the primary and secondary windings as would be produced by advancement of a broken piece of the ferrous metal mandrel between the windings.
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Snow Walter E.
Spadacene Joseph C.
Westinghouse Electric Corp.
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