镐齿滚刀的齿形及布齿参数优化试验研究

Experimental Study on Optimization of Pick Tooth Shape and Arrangement Parameters for Pick Tooth Inserted Cutter

为研究镶齿滚刀上镐齿的齿形参数以及齿间距、排间距对其破岩效率及齿下岩石损伤区的影响规律,选用不同齿形的镐齿对尺寸为300 mm×300 mm×300 mm北山花岗岩进行侵入破岩试验,对镐齿侵入试验过程、侵入力、破岩体积、破岩效率、齿下岩石损伤区特征进行分析。试验结果表明:1)所选试验齿形中直径为18 mm镐齿破岩效率最高;2)齿间距和排间距为35~40 mm时,镐齿侵入破岩效率最高;3)应用荧光裂纹显现法分析齿下岩石裂纹分布特征,获得了不同齿形参数下岩石损伤区范围及裂纹扩展模式、裂纹特征分析结果,与通过侵入力、破岩比能分析得出的破岩效率结论一致。

To examine the influence of tooth shape parameters,tooth spacing,and row spacing on the rock breaking efficiency and rock damage zone under the teeth of the toothed roller cutter,different tooth shapes of the toothed cutter are selected to conduct intrusion rock breaking tests on Beishan granite with a size of 300 mm×300 mm×300 mm.The intrusion process,intrusion force,rock breaking volume,rock breaking efficiency,and characteristics of rock damage zone under the teeth are analyzed.The experimental results reveal the following:(1)The rock breaking efficiency of the selected test tooth shape with a diameter of 18 mm is the highest.(2)When the tooth spacing and row spacing ranging from 35 to 40 mm can achieve the highest rock breaking efficiency of the pick tooth intrusion.(3)The fluorescence crack visualization method is employed to analyze the distribution characteristics of rock cracks under teeth.The range of rock damage zone and crack propagation mode under different tooth shape parameters are obtained,and the crack characteristic analysis results are consistent with the results of rock breaking efficiency obtained through intrusion force and rock breaking specific energy analysis.