Determination of the state of a suspension means
AssigneeInventio AG
InventorsFlorian Dold, Volker Zapf
Life of this patent
Estimating the term…
Abstract
A method and an apparatus monitor the physical state of a suspension means that is connected to an elevator car and can move the same. The support means has markings along its length that divide the support means into segments. The strain difference of the suspension means is monitored segment by segment using a first strain at a first load and a second strain at a second load being determined by a signal processing unit from a distance between two selected markings detected by a detection device, and a strain difference representing the elastic behavior of the segment is calculated from the two strains, wherein the load acting on the suspension means between the two selected markings is measured by a load measuring device.
Claims15
A method for monitoring a physical state of a suspension means for moving an elevator car, the suspension means being connected to and suspending the elevator car, the suspension means being divided into segments by markings along a length of the suspension means, the method comprising the steps of:
- detecting the markings with a detection device;
- monitoring a strain difference of the suspension means segment by segment by determining using a signal processing unit a first strain at a first load acting on the suspension means and a second strain at a second load acting on the suspension means from a distance between two selected ones of the detected markings, wherein the first load and the second load acting on the suspension means between the two selected markings are measured by a load measuring device;
- calculating the strain difference representing an elastic behavior of a one of the segments that is between the two selected markings from the first strain and the second strain;
- performing the monitoring and the calculating for additional ones of the segments;
- and
- generating an alarm signal when any one of the calculated strain differences indicates that the suspension means is at a point of discard.
A method for monitoring a physical state of a suspension means for moving an elevator car in an elevator system, the suspension means being connected to and suspending the elevator car, the suspension means being divided into segments by markings along a length of the suspension means, the method comprising the steps of:
- selecting one of segments;
- determining by a signal processing unit a first strain at a first load acting on the suspension means and a second strain at a second load acting on the suspension means from a distance between two of the markings detected by the detection device that delimit the selected one segment, wherein the first load and the second load acting on the suspension means between the two markings are measured by a load measuring device;
- calculating a strain difference representing an elastic behavior of the selected one segment between the two markings from the first strain and the second strain;
- generating an alarm signal when the calculated strain difference indicates that the suspension means is at a point of discard and transmitting the alarm signal to at least one of a control unit of the elevator system and an output unit of the elevator system;
- and
- performing the method steps for at least another of the segments of the suspension means.
Dependencies are inferred from the claim text.