Verfahren und Vorrichtung zur Kontrolle von Hebeseilen

摘要

A hoisting rope (18) for an elevator includes a plurality of longitudinally spaced, discrete targets (36) retained within the rope (18). The targets (36) have a characteristic that may be monitored by a device that is responsive to that characteristic. In a particular embodiment, the targets (36) are formed from a magnetically permeable material and the monitoring device responds to changes in the magnetic field as the target (36) passes the monitoring device. In another embodiment, the targets (36) are formed from material that reflects electromagnetic energy. In this embodiment, the monitoring device emits electromagnetic energy and is sensitive to the energy that is reflected back from the target (36). A method of inspecting the hoisting ropes (18) includes the steps of positioning the monitoring device proximate to the hoisting rope (18), moving the hoisting rope relative to the device, and monitoring the targets (36) to determine the spacing between targets. Changes in spacing are indicative of stretching of the rope, and thereby degradation of the rope.