Tonic testing device

The tensile strength testing apparatus addresses detection accuracy issues in wire ropes by dynamically adjusting magnetic field interaction with the rope ends, ensuring precise defect detection through mode-specific demagnetization or magnetization.

JP7881001B2Active Publication Date: 2026-06-26MITSUBISHI ELECTRIC CORP +1
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Patent Information

Application Number
JP2024574142
Authority / Receiving Office
JP · JP
Patent Type
Patents
Current Assignee / Owner
Filing Date
2023-02-01
Publication Date
2026-06-26
Estimated Expiration
2043-02-01

AI Technical Summary

Technical Problem

The detection accuracy of existing magnetic sensor-based inspection devices for wire ropes in endless handrails is compromised due to varying overlap and separation of wire rope ends, leading to either strong magnetic fields exceeding sensor limits or reduced accuracy when widening the sensor range.

Method used

A tensile strength testing apparatus with a magnetic sensor, detection magnet, demagnetizer, and magnetizer that adjusts its operation mode based on the overlap or gap between wire rope ends, either demagnetizing or magnetizing the rope to manage magnetic fields effectively.

Benefits of technology

The apparatus maintains high detection accuracy by controlling magnetic fields, allowing for precise detection of defects in wire ropes with varying end configurations without needing to widen the sensor's detectable range.

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Abstract

This tensile body inspection device (1) comprises: a magnetic sensor (30) having a detection element (31) for detecting a magnetic field, the detection element (31) facing an object (6) that includes a tensile body (61), and a detection magnet (32) for generating a magnetic field that acts on the object (6); and a demagnetizer (2) for demagnetizing the tensile body (61), the demagnetizer (2) facing the object (6) at a position that is set apart from the magnetic sensor (30) in the extension direction of the tensile body (61).
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Citation Information

Patent Citations

  • Damage detector for escalator handrail

    JP1994316394A

  • Method for detecting breaking of reinforcing rod of concrete structure

    JP2005003405A

  • Wire rope severance sensing device

    JP2005162379A

  • Rail inspection device

    JP2008111753A

  • Device for monitoring metal wires

    JP2012514207A