基于低频涡流检测的露天矿破碎机运动铁磁物体监测研究

在露天煤矿生产作业过程中,采掘及运输时脱落的电铲配件、铁板等较大铁磁物体随煤块进入破碎机,将导致破碎机卡死、破碎齿损坏、电机烧毁等严重生产事故.本文基于低频涡流检测原理可检测出铁磁性物体的特点,开展了露天矿二级破碎站运动铁磁物体监测研究;以SANDVIK的CR610/14—35双齿辊式筛分式破碎机为实验对象,依据电磁互...

Research on monitoring of moving ferromagnetic objects in open-pit mine crushing station based on low-frequency eddy current detection

In the process of open-pit coal mine production, mining and transport loss of excavator accessories, iron and other large ferromagnetic objects with the coal into the crusher, will result in crusher jammed, broken tooth damage and even motor burn down and other serious production accidents, based on the principle of low frequency eddy current detection can effectively detect ferromagnetic objects, the characteristics of the ferromagnetic objects open-pit mine secondary crushing plant movement monitoring research. Taking SANDVIK's CR610/14—35 double-tooth roller sieve crusher as the experimental object, the mechanism of the detection system was analytically modeled according to the principle of electromagnetic mutual induction. The results of modeling and experiments show that the eddy current generated by ferromagnetic objects is weak due to the existence of strong background noise. The signal to noise ratio(SNR)can be improved by optimizing the parameters of the detector and planning the path of the detector. According to the characteristics of the experimental object, the maximum SNR was obtained when the ratio of the radius of the metal to the detection distance was 0.048, and the ratio of the coil radius to the detection distance was 0.044 5. In the 1~35 kHz segment, the SNR is higher in the low frequency band than the high frequency band. The initial value and response time of the path entering the detection area perpendicular to the detection axis have obvious advantages over the path entering the detection area parallel to the axis.