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分析了钻割一体化水力割煤过程中各阶段的特点,推导和描述了磨料在射流中的受力状况和速度分布,首次提出深孔水力割煤中存在“水打架”和“穿越水带”现象,分析得出这两种现象削弱了射流的割缝能力.为减少这两种不利影响,通过物理实验对割缝入射角和割缝方式进行了优化,得出当入射角为62°时割缝效果最佳,并依此设计了钻头.最后将优化结果在高瓦斯低透气性矿井进行了实际应用,应用结果表明,优化后的钻头和割缝方式能显著提高设备割缝能力和矿井瓦斯抽采效率.
The characteristics of all stages in the process of hydraulic cutting coal cutting are analyzed. The stress and velocity distribution of abrasive in the jet are deduced and described. It is proposed for the first time that “water fighting” and “ Through the water band ”phenomenon, analysis of these two phenomena weakened jet cutting ability.In order to reduce these two adverse effects, through the physical experiment of the kerf incision angle and kerf mode was optimized, come to the conclusion that when the incident The best kerf is obtained when the angle is 62 °, and the drill bit is designed accordingly.At last, the optimization results are practically applied in high gas and low permeability mine. The application results show that the optimized drill and kerf method can significantly improve the equipment Skidding capacity and mine gas drainage efficiency.