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为解决煤矿井下瓦斯抽排孔施工过程中正循环压风钻进工艺产生的粉尘污染问题,借鉴引射器原理设计近水平反循环钻头,利用单因素试验设计原理对钻头底部5个结构参数进行试验优化研究,得到钻头底部最优结构参数。当近水平反循环钻头直径为96 mm时,其最优底部结构参数是:底喷孔直径D1=3 mm、底喷孔扩大段直径D2=10 mm、底喷孔扩大段厚度H1=20mm、扩压槽深度H2=20 mm、扩压槽螺旋角度A=10°。
In order to solve the problem of dust pollution caused by the positive pressure air blow-through process during the process of gas drainage holes in coal mine, the horizontal anti-cyclic drill bit is designed based on the principle of ejector. The five structural parameters at the bottom of the drill bit are optimized by the single factor experimental design principle Research, get the bottom of the bit the best structural parameters. When the horizontal drilling bit diameter is 96 mm, the optimum bottom structural parameters are as follows: the diameter of the bottom nozzle hole is D1 = 3 mm, the diameter of the bottom nozzle hole is D2 = 10 mm, the thickness of the bottom nozzle hole is H1 = 20mm , The depth of the expansion tank H2 = 20 mm, the angle of the expansion tank spiral A = 10 °.