基于静磁效应的TBM滚刀磨损量检测方法

DETECTION METHOD FOR CUTTER WEAR OF TBM BASED ON MAGNETOSTATIC EFFECT

全断面隧道硬岩掘进机(TBM)的滚刀磨损使掘进能力显著下降。针对现有磨损量检测法的缺陷,提出基于静磁效应的检测法,极大放宽了防护壳的材料限制,并且具有线性度高的优势。首先提出了检测方法的原理图,并通过有限元方法研究了检测方法的可行性。其次,搭建了实验测试装置及信号处理电路,测试结果验证了静磁力与磨损量间的线性变化特点,静磁力变化率始终保持在-592 mN/mm左右,远高于25 mN的压力传感器精度,因此保证了较高的精确度。

The cutter wear of TBM significantly reduce the tunneling ability. For overcoming the defects of current testing method, the detection based on magnetostatic effect is proposed in this work. The proposed method greatly loosens the limitation of the protective shell material and has the advantage of high linearity. At first, the principle of detection method is presented, and the feasibility is investigated by finite element method. Secondly, the experimental equipment and signal processing circuit were built. The test results verify the linear variation feature between static magnetic force and wear loss. The gradient of static magnetic force is always about-592 mN/mm, which is much higher than the 25 mN accuracy of pressure sensor, so high accuracy was ensured.