• CN:11-2187/TH
  • ISSN:0577-6686

机械工程学报 ›› 2020, Vol. 56 ›› Issue (12): 34-41.doi: 10.3901/JME.2020.12.034

• 仪器科学与技术 • 上一篇    下一篇

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矩形线圈钢丝绳捻距涡流检测研究

李军霞1,2,3, 李聪豪1,2,3, 焦少妮1,2,3, 李腾宇1,2,3, 寇子明1,2,3   

  1. 1. 太原理工大学机械运载与工程学院 太原 030024;
    2. 山西省矿山流体控制工程技术研究中心 太原 030024;
    3. 矿山流体控制国家地方联合工程实验室 太原 030024
  • 收稿日期:2019-06-27 修回日期:2019-12-24 出版日期:2020-06-20 发布日期:2020-07-14
  • 通讯作者: 焦少妮(通信作者),女,1986年出生,博士,讲师。主要研究方向为电磁检测。E-mail:532689699@qq.com
  • 作者简介:李军霞,女,1976年出生,博士,教授,博士研究生导师。主要研究方向为机电液一体化。E-mail:1983767665@qq.com;寇子明,男,1964年出生,博士,教授,博士研究生导师。主要研究方向为机电液一体化。E-mail:zmkou@163.com
  • 基金资助:
    山西煤基低碳联合基金重点支持(U1510205)、山西省应用基础研究(201801D121177)和远东无损检测新技术论坛创新人才支持计划资助项目。

Research on Eddy Current Testing of the Lay Length of Wire Rope with Rectangular Coil

LI Junxia1,2,3, LI Conghao1,2,3, JIAO Shaoni1,2,3, LI Tengyu1,2,3, KOU Ziming1,2,3   

  1. 1. College of Mechanical and Vehicle Engineering, Taiyuan University of Technology, Taiyuan 030024;
    2. Shanxi Province Engineering Technology Research Center For Mine Fluid Control, Taiyuan 030024;
    3. National-local Joint Engineering Laboratory of Mining Fluid Control, Taiyuan 030024
  • Received:2019-06-27 Revised:2019-12-24 Online:2020-06-20 Published:2020-07-14

摘要: 捻距不均匀会造成钢丝绳提前报废,对捻距进行检测可以为其生产工艺的改进提供设计依据,提升钢丝绳的安全使用性能。针对传统捻距检测无法对运动中钢丝绳进行实时检测,机器视觉检测对外界光照和钢丝绳表面清洁度要求高等问题,提出用涡流法对钢丝绳捻距进行检测。为扩大细长钢丝绳结构表面磁场的覆盖面积,利用矩形线圈组成的差分电桥进行检测。对钢丝绳捻距双矩形差分电桥涡流检测进行有限元分析,差分电压实部变化曲线中相邻波峰或者波谷的间距为钢丝绳的股间隙,一个捻距扫描范围内出现的波峰和波谷数量与钢丝绳的股数相对应。矩形线圈上、下边电流元感应的涡流会在钢丝绳表面对消,对消效应越小,钢丝绳捻距检测灵敏度越高。为提取试验中的有用信号,利用集合经验模态分解对扫描信号进行后处理。当相关系数较大时,相邻波峰或波谷的间距为钢丝绳捻距。当相关系数较小时,一个捻距内的波峰或波谷数与有限元分析结果吻合。涡流法得到的捻距与理论捻距的最大相对误差为2.38%。

关键词: 捻距, 矩形线圈, 涡流检测, 有限元法, 后处理

Abstract: The uneven lay length leads to the early retirement of the wire rope. The lay length detection provides the design bases for improving the production technology and enhances the safe use of the wire rope. The wire rope in motion can not be detected by the traditional lay length detection method. The imaging recognition method for measuring the lay length is limited by the external light and the attachment on the surface of the wire rope. In view of the above problems, the lay length is detected by the eddy current method. To enlarge the covering area of the magnetic field, the differential bridge composed of the rectangular coil is utilized. The finite element analysis of the lay length of the wire rope with the differential bridge is conducted. The curve of the real part of the differential voltage shows that the distance between the adjacent peaks or throughs of the scanning signal is the gap between the two adjacent strands. In the range of a lay length the number of the peaks or throughs of the scanning signal is related to the strands number of the wire rope. The eddy currents induced by the current element in the upper side and lower side of the rectangular coil cancel on the wire rope surface. The weaker the cancellation effect, the higher the detection sensitivity of the lay length. To extract the useful information from the experimental results, the scanning signal is post-processed by the ensemble empirical mode decomposition (EEMD) method. As the correlation coefficient is large, the distance between the adjacent peaks or throughs is the lay length. As the correlation coefficient is small, the number of the peaks or throughs in a lay length is the same with the simulated result. The results show that the relative error of the wire rope lay length obtained by this method is less than 2.38%.

Key words: lay length, rectangular coil, eddy current testing, finite element method, post-processed

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