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1958年罗马尼亚提出一种电动振动式凿岩机,该机械在冲击机构上安有两个伞齿轮,由电动机带动旋转;利用固定在齿轮上的偏心质量的离心力作用,使冲击机构作往复运动。在冲击锤回程时,钎子回转;利用旁测给水冲洗法排除岩粉。试制的凿岩机的技术性
In 1958 Romania proposed an electric vibratory rock drill with two bevel gears mounted on the percussion mechanism and driven by the motor to rotate. The impact mechanism was reciprocated by the centrifugal force of the eccentric mass fixed on the gear. In the hammer return, the solder rotation; the use of next measure water rinse method to exclude rock powder. Trial production of rock drill technical