Measurement of lay length of wire rope
US9470657B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Oct 4, 2012 |
| Grant date | Oct 18, 2016 |
| Priority date | — |
| Expiry date | Oct 27, 2032 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N27/90
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
The invention relates to a method and apparatus for measuring lay length of a wire rope having a number or external strands to form a rope having spiral grooves in the surface between the strands. A magnetic flux circuit is generated, part of which is formed within a region of the advancing wire rope. Variations of magnetic field around the region of the rope or variations of magnetic flux entering or leaving the rope are sensed by at least two sensors arranged around the rope. Signals from the sensors are subtractively combined to eliminate variations due to off-axis movements of the rope, and the combined signals reveal an oscillating pattern due to the undulating surface of the rope. Linking the oscillating pattern to distance along the rope reveals the lay length, which corresponds to a number of oscillations which is the same as the number of strands at the surface.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.