It is a disc or collar with an irregularly shaped edge, which operates in contact with a rod or lever, and causes it to oscillate, or to move to and fro.
它是一个不规则形的圆碟或圆环,和一个杆或棒连接运作,使它上下或往来摆动。
Drill rod and collar are key apparatus in drilling exploration and well drilling industry.
钻杆和钻铤等管状螺纹联接件是钻探和石油钻井工业中的关键设备。
应用推荐