钢丝绳探伤永磁励磁装置的结构与通用性分析

Analysis of Structure and Universal Property of Permanent Magnet Excitation Device for Steel Wire Rope Flaw Detection

为了进一步探究钢丝绳无损检测永磁励磁装置的特性,以提高检测器的性能,对励磁装置进行了全面的分析。通过三维建模,有限元仿真的方法分析了永磁励磁装置中永久磁铁的位置、励磁回路的方式对励磁效果的影响,设计了用于直径36mm钢丝绳励磁的励磁装置的结构尺寸,并用该励磁装置对直径16~36mm的钢丝绳进行励磁,通过等效磁路计算和有限元仿真的方法对励磁效果进行了分析。研究结果表明:将永久磁铁放在永磁励磁装置的两端可以使励磁装置中部形成均匀磁化段,利于检测元件的放置;采用多回路周向均布励磁磁路可以使钢丝绳磁化得更均匀,而且更容易将钢丝绳磁化到饱和状态;永磁励磁装置具有通用性。

In order to further explore the characteristics of the permanent magnet excitation device for steel wire rope nondestructive testing,a comprehensive analysis of the excitation device is carried out in order to improve the performance of the detector.The three-dimensional modeling and finite element simulation method are used to analyze the influence of the position of the permanent magnet in the permanent magnet excitation device and the excitation circuit on the excitation effect.The structure size of the excitation device for the excitation of the steel wire rope with a diameter of 36 mm is designed and used.The device excites the wire rope with a diameter of 16~36 mm,and the excitation effect by equivalent magnetic circuit calculation and finite element simulation.The research results show that placing permanent magnets on both ends of the permanent magnet excitation device can form a uniform magnetization section in the middle of the excitation device,which is beneficial to the placement of the detecting components.The multi-circuit circumferentially distributed excitation magnetic circuit can make the steel wire magnetize more evenly and it is easier to magnetize the wire rope to saturation state,the permanent magnet excitation device has universal property.