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自1979年对装配式回转钻头进行研究以来,曾在131煤田地质勘探队进行过试验。1981年为了配合大同矿区“注水放顶”课题的研究,在大同四矿注水孔的钻进中成批投入了使用。 四矿注水孔的结构如图1所示。钻孔布
Since 1979, the assembly rotary drill bit has been in the coal field geological team 131 has been tested. In 1981 in order to cooperate Datong mining “water injection” project, in Datong No.4 mine water hole drilling put into use in batches. Four ore filling hole structure shown in Figure 1. Drilling cloth