This paper described the structure, features, test results and application effect of the newly developed Model QFZ-22 portable drilling machine for outburst control.
介绍了新研制的QFZ—22轻便型防突钻机的结构、特点、试验情况及推广应用效果。
A portable and rotary type ultrasonic drilling machine is developed and designed for drilling of carbon fibre composition components.
为碳纤维复合材料构件的钻孔，研制出一种便携式旋转超声钻。
A portable and rotary type ultrasonic drilling machine is developed and designed for drilling of carbon fibre composition components.
为碳纤维复合材料构件的钻孔，研制出一种便携式旋转超声钻。
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