rotary drill

基本解釋

The rock stratum drilled by a rotary drill is random distributed and complicated, so it is difficult to define the drilling process.
牙輪鉆機鉆鑿的巖層是隨機分布、錯綜復雜的，因而鉆進過程難以定義。
This paper demonstrates developing history of the technique, introduces some new types of percussion-rotary drill and operating technology, and analyzes developing trend.
簡要闡述了沖擊旋轉鉆進技術的發(fā)展歷程，著重介紹了一些沖擊器新品種及其相關的鉆進新工藝，分析了該項技術的發(fā)展趨勢。
In rock drilling process with percussion-rotary drill rotating drilling tool bears two toques: dynamic torque which drives drilling tool into rock mass, and resistance torque of rock mass.
前言：在沖擊—回轉式鑿巖機向巖石鉆進過程中，旋轉中的鉆具承受著兩種力矩的作用：一是驅動其旋轉的動力矩；二是被鉆巖石阻止其旋轉的阻力矩。

The number of oil and gas rotary drill operates in the metropolitan region is 14 times the national average.
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