percussion tool drilling 标签 ; 顿钻钻井法
percussion tool weight 冲击钻具重量
hydraulic percussion tool 液动射流式冲击器
N a power driven tool which operates by striking rapid blows: the power may be electricity or compressed air 冲击工具
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：在冲击—回转式凿岩机向岩石钻进过程中，旋转中的钻具承受着两种力矩的作用：一是驱动其旋转的动力矩；二是被钻岩石阻止其旋转的阻力矩。
The tool box contains 48 pc tools with both percussion or electric drill for routine maintenance of biogas works. The box is made of aluminum.
本工具箱选用冲击，电钻两用钻，选配适合沼气日常维修的48件工具组合，采用铝合金箱配装。
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