Method and apparatus for detecting degradation of resin film

摘要

A method for detecting degradation of resin film detects whether a resin coated rope having a circumferential portion coated with resin film has the resin film degraded. The method for detecting degradation of resin film includes: winding a wire on a circumferential portion of the resin coated rope; applying tension to the wire to compress the resin film in a radial direction of the resin coated rope; and comparing a first relationship with a second relationship to determine how the resin film is degraded, the first relationship indicating a relationship between the tension of the wire and how much amount the resin film has compressed, as obtained in the applying, the second relationship indicating a relationship between the tension of the wire and how much amount the resin film has compressed, as predetermined as a reference.

主权项

1. A method for detecting degradation of resin film to detect whether a resin coated rope for an elevator, that has a circumferential portion coated with resin film and internally has a twisted steel wire bundle, has said resin film degraded, comprising:
winding a linear object on said circumferential portion of said resin coated rope; applying tension to said linear object to compress said resin film along an entire circumference of said resin coated rope in a radial direction of said resin coated rope; and comparing a first relationship with a second relationship to determine how said resin film is degraded, said first relationship indicating a relationship between said tension of said linear object and how much amount said resin film has compressed, as obtained in the applying, said second relationship indicating a relationship between said tension of said linear object and said how much amount said resin film has compressed, as predetermined as a reference, wherein said linear object is a wire having an outer diameter of 0.1-1.0 mm, wherein said resin film is thermoplastic polyurethane elastomer, and wherein comparing a first relationship with a second relationship to determine how said resin film is degraded includes comparing a rate of change obtained by dividing an absolute value of a difference between a value of said first relationship and a value of said second relationship by said value of said second relationship with a predetermined rate of change to determine how said resin film is degraded.