In order to address the unclear mechanism of dust generation during coal cutting by picks at the current driving face, experiments on dust generation at different drilling speeds were conducted using a self-built experimental apparatus for coal cutting dust. Numerical simulations were also employed to further analyze the dust generation mechanism during coal cutting by cutter picks. The research findings indicate that as the drilling speed increases, the dust generation initially increases and then stabilizes. The peak values of total dust and potentially respirable dust generation rates were observed at a drilling speed of 200 mm/min, reaching 204.21 g/t and 29.73 g/t, respectively. The particle size distribution of dust generated from the cutting of the same coal followed a similar trend. The coal fragmentation by cutter picks is a result of the combined action of tensile and shear forces. The growth of crack quantity follows an S-shaped curve, characterized by slow growth, rapid growth, and stabilization. With an increase in cutting depth, both the force and torque on the cutting head exhibited a continuous increase followed by stable fluctuations. The energy consumption during the cutting process mainly involves overcoming the coal's strain energy, and the trend of energy dissipation initially increases and then decreases. These research findings provide a theoretical basis for further understanding the mechanism of coal cutting dust generation by cutter picks and achieving efficient control of dust emissions at the source.

中文翻译：

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割头不同钻孔速度下割煤产尘特性研究


为解决当前驱动面截齿采煤时产生粉尘机理不明确的问题，利用自建的采煤扬尘实验装置，对不同钻孔速度下产生的粉尘进行了实验。还采用数值模拟进一步分析了刀具镐割煤过程中的粉尘产生机制。研究结果表明，随着钻孔速度的增加，扬尘量最初增加，然后稳定下来。在 200 mm/min 的钻孔速度下观察到总粉尘和潜在可吸入粉尘产生率的峰值，分别达到 204.21 g/t 和 29.73 g/t。切割相同煤产生的粉尘的粒度分布也遵循类似的趋势。刀具截齿的煤炭碎裂是拉力和剪切力共同作用的结果。裂纹数量的增长遵循 S 形曲线，其特征是缓慢增长、快速增长和稳定。随着切削深度的增加，切削头上的力和扭矩均表现出持续增加，然后是稳定的波动。切割过程中的能耗主要涉及克服煤的应变能，能量耗散的趋势先增加后减少。这些研究结果为进一步理解割煤机理割尘机理，实现从源头上有效控制粉尘排放提供了理论依据。