Flaw detector for wire rope

Abstract

The present invention provides a flaw detector for wire rope, which can less maintain the pushing force relatively to the radial direction of wire rope and can restrain the vibration of the wire rope. The flaw detector comprises the following components: a pair of permanent magnets (2a,2b) which perform magnetization in the length direction of the wire rope (4); a magnetic sensor (3) which is configured near the part of wire rope (4) magnetized by the permanent magnets (2a,2b) for detecting the leakage flux leaded from the magnetized part of the wire cable (4); and a pair of positioning mechanisms (5,6) which are used for positioning the permanent magnets (2a,2b) and the magnetic sensor (3) relatively to the wire rope (4). Each of the positioning mechanisms (5,6) comprises the following components: rotating members (5a,5b,5c,6a,6b,6c) which contact with a mode of surrounding three respective positions on the periphery of the wire rope (4); and spiral springs (5d,5e,6d,6e) which cause the rotating members (5a,5b,5c,6a,6b,6c) to generate compact contact forces relatively to the wire rope (4).

Description

technical field [0001] The present invention relates to a flaw detection device for steel cables suitable for electromagnetic flaw detection. Background technique [0002] Steel cables are widely used in elevators, elevators, cable cars, cranes, etc. However, depending on the frequency of use, local damage due to fatigue or wear occurs, and the steel cables of the structural elements are sequentially broken. This amount of breakage increases year by year, and when the amount of breakage exceeds a predetermined value, the steel cable is judged to have reached the end of its service life and is replaced. Therefore, it is necessary to evaluate whether the steel cable can be used safely by measuring the amount of breakage of the steel cable through regular inspections. [0003] In order to check the amount of breakage of such a steel cable in use, an electromagnetic flaw detection method is known as a flaw detection method for a steel cable that can be easily used. As a device...

AI Technical Summary

Problems solved by technology

Therefore, there is a problem that such a wire rope flaw detection device vibrates in the moving direction of the wire rope, which affects the detection value of the leakage magnetic flux detected by the magnetic sensor.

However, the vibrations of the cables are different among the four cables. If the radial vibration of the cables to the cables is to be suppressed by the pair of rollers, the pushing force of these rollers to the cables must be very large. The setup itself is difficult

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