磨料射流定向切顶系统的设计与研制  

Development and optimization of abrasive water-jet directional slitting machine for coal mine

作　　者：卢义玉[1,2] 秦旭前 汤积仁[1,2] 章文峰[1,2] 凌远非 李倩[1,2] LU Yiyu;QIN Xuqian;TANG Jiren;ZHANG Wenfeng;LING Yuanfei;LI Qian(State Key Laboratory of Coal Mine Disaster Dynamics and Control,Chongqing University,Chongqing 400044,P.R.China;National&Local Joint Engineering Laboratory of Gas Drainage in Complex Coal Seam,Chongqing University,Chongqing 400044,P.R.China)

机构地区：[1]重庆大学煤矿灾害动力学与控制国家重点实验室,重庆400044 [2]重庆大学复杂煤气层瓦斯抽采国家地方联合工程实验室,重庆400044

出　　处：《重庆大学学报》2022年第2期1-13,共13页Journal of Chongqing University

基　　金：长江学者和创新团队发展计划资助项目(IRT17R112)。

摘　　要：N00工法是一种节约资源并能降低开采成本的长壁采煤工法,快速无伤定向切割顶板岩石使采空区顶板垮落是该工法的关键。基于水射流理论与技术,提出了利用磨料射流定向切割顶板的新思路,研究了磨料射流定向切顶系统的结构组成及工作原理,设计了水射流喷嘴、切割喷头、定向器、输送机及磨料供给系统等关键部件的结构与尺寸,通过实验优化了磨料射流定向切顶的最优工作参数,并于陕西某矿S1201-Ⅱ工作面进行了顶板切割试验。结果表明,在射流压力25 MPa,喷嘴直径1.5 mm,磨料类型黄沙/石英砂,磨料质量分数3.5%,切割速度4.4 mm/s条件下,系统可在1个循环时间(50 min)、1个步距(840 mm)范围内对7000~8000 mm长度的4孔同步定向切缝,实现对留巷顶板的快速高效定向切割。The N00 method is a highly efficient and resource saving mining method,and its key step is to quickly separate the gob roof and the roadway roof by making a slit between them.Based on the water jet theory and technology,a new idea of using abrasive jet directional cutting roof was proposed.The structural composition and working principle of the abrasive jet directional cutting system were studied,and the water jet nozzle,cutting nozzle,orienter,conveyor,abrasive were designed.Through experiments,the working parameters of the abrasive jet directional cutting were optimized.The roof cutting test was carried out on the S1201-Ⅱworking face of a mine in Shaanxi.The results show that under the conditions of jet pressure 25 MPa,nozzle diameter 1.5 mm,abrasive type yellow sand/quartz sand,abrasive mass concentration 3.5%and cutting speed 4.4 mm/s,the developed system is able to make slits at the same time in 4 holes of 7000-8000 mm deep within a cycle time(50 min).

关 键 词：沿空留巷 切顶卸压 N00工法 磨料射流 定向切缝 

分 类 号：TD431[矿业工程—矿山机电]