Ferromagnetic cable metal cross-sectional area loss detection method and device

Abstract

The invention discloses a method and device for detecting loss of metal cross section area of a ferromagnetic cable rope. The method provided by the invention comprises the following steps of: winding a cable which is connected with a direct-current power supply on a detected cable rope to be used as a direct-current magnetizing coil; distributing an armature group and a magnetism-sensitive element along the circumferential direction of the cable rope; switching on a direct-current power supply and magnetizing the cable rope by a direct-current coil to form a magnetic circuit with the armature group; measuring a magnetic induction intensity value in the circuit by the magnetism-sensitive element which is placed in the magnetic circuit and outputting the value in the form of voltage; obtaining a measuring coefficient through comparing the change of voltages which are output by the magnetism-sensitive element before and after a standard sample is inserted so that the detection of the loss of the metal cross section area of the cable rope is realized. The device provided by the invention comprises the magnetism-sensitive element, the magnetizing coil, a data processor and one or morearmature groups; and each armature group is composed of two symmetrical inverted-L-shaped armatures. By utilizing a way of internally placing a magnetic source, a magnetic field generated by the magnetizing coil is directly acted on the detected cable rope so that a magnetic system needed by the detection method has the advantages of small volume, light weight and convenience for adjusting.

Description

technical field [0001] The invention belongs to the non-destructive detection technology, and relates to a method and a device for detecting the metal cross-sectional area loss of ferromagnetic cables, which are used for detecting the wear and corrosion states of ferromagnetic cables such as steel wire ropes and stay cables. Background technique [0002] Ferromagnetic cables include steel wire ropes, bridge cables, amusement facility cables, etc. As a key load-bearing component, they are widely used in coal mines, metallurgy, construction, transportation, tourism and other industries. Abrasion, or cable corrosion due to external environmental factors, the above two situations will cause the metal cross-sectional area of ​​the cable to decrease, thereby reducing the effective load-bearing cross-sectional area of ​​the cable, and endangering the safe operation of the equipment. Therefore, effective methods must be adopted to detect the loss of cable cross-sectional area to ens...

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Problems solved by technology

In the above detection method, the magnetic flux detection method is due to the external magnetic source, that is, the magnetic field generated by the permanent magnet or the DC coil does not directly act on the cable under test, but the magnetic flux is introduced into the cable through a certain magnetic circuit design. , due to the existence of leakage flux, it will inevitably cause loss of magnetic energy. In order to meet the magnetization requirements of the detection method, the magnetization energy must be increased, so that the volume and weight of the entire magnetization system will increase. In the main flux detection method, due to Only the coil method can be used to induce the change of the magnetic field, which is greatly affected by the detection speed; the magnetic bridge circuit method uses the integration of multiple magnetic circuits, and the adjustment of the entire magnetic circuit is complicated in order to achieve the linear operating point of the magnetic circuit.

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