Research on mine-used wire rope flaw detector based on Hall element
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摘要: 针对目前钢丝绳探伤仪无法准确检测钢丝绳是否发生损伤的问题，基于漏磁检测法设计了一种基于霍尔元件的矿用钢丝绳探伤仪。采用永磁体磁化钢丝绳，当钢丝绳受损时损伤处会有漏磁产生，利用霍尔元件采集钢丝绳损伤处的漏磁信号，通过分析霍尔元件的输出电压波形判断钢丝绳是否存在损伤。为了进一步提高该探伤仪检测的准确度，优化了霍尔元件的轴向、周向和径向布置方式：利用Ansoft Maxwell对钢丝绳的磁化情况进行仿真，根据仿真结果确定霍尔元件的轴向布置方式，霍尔元件的轴向位置选择布置在探伤仪的中心位置；为了消除钢丝绳的股间效应，对霍尔元件的周向布置进行了计算与设计，当2个检测点的周向距离为29 mm时可基本消除股间效应的影响；采用改变提离距离的方法研究了霍尔元件的径向布置，钢丝绳运动过程中会产生抖动，为防止钢丝绳与霍尔元件产生接触导致设备损坏，需根据钢丝绳的抖动情况选择合适的提离距离布置霍尔元件。实验结果表明，该探伤仪可以根据钢丝绳损伤处信号突变情况准确检测钢丝绳是否发生损伤。Abstract: In view of problem that current wire rope flaw detector cannot accurately detect whether the wire rope is damaged or not, a mine-used wire rope flaw detector based on Hall elements was designed according to magnetic flux leakage detection method. Permanent magnet magnetization wire rope is adopted. When the wire rope is damaged, there will be magnetic leakage at the damaged part. Hall element is used to collect magnetic leakage signal at the damaged part of the wire rope, and by analyzing output voltage waveform of Hall element it is determined whether the wire rope is damaged or not. In order to further improve detection accuracy of wire rope flaw detector, axial, circumferential and radial arrangement of the Hall element is optimized: uses Ansoft Maxwell to simulate magnetization condition of wire rope, the axial arrangement of Hall elements is determined based on simulation results, and the axial position of the Hall element is selected in center of the flaw detector. In order to eliminate inter-strand effect of wire rope, the circumferential arrangement of Hall elements is calculated and designed. The inter-strand effect can be basically eliminated when circumferential distance between two detection points is 29 mm. The radial arrangement of Hall element is studied by changing lifting distance through experiment. There will be jitter during movement of the wire rope, in order to prevent equipment from being damaged due to contact between the wire rope and the Hall element, the appropriate lifting distance should be selected to arrange the Hall element according to jitter of the wire rope. The experimental results show that the flaw detector can accurately detect whether the wire rope has damaged or not according to the signal mutation at the wire rope damage.
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期刊类型引用(14)
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