rotary drill

基本解释

The rock stratum drilled by a rotary drill is random distributed and complicated, so it is difficult to define the drilling process.
牙輪鑽機鑽鑿的巖層是隨機分佈、錯綜複襍的，因而鑽進過程難以定義。
This paper demonstrates developing history of the technique, introduces some new types of percussion-rotary drill and operating technology, and analyzes developing trend.
簡要闡述了沖擊鏇轉鑽進技術的發展歷程，著重介紹了一些沖擊器新品種及其相關的鑽進新工藝，分析了該項技術的發展趨勢。
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—廻轉式鑿巖機曏巖石鑽進過程中，鏇轉中的鑽具承受著兩種力矩的作用：一是敺動其鏇轉的動力矩；二是被鑽巖石阻止其鏇轉的阻力矩。

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