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THREADED CONNECTION FOR DRILLING CORE INTENDED FOR IMPACT DRILLING IN ROCKS
THREADED CONNECTION FOR DRILLING CORE INTENDED FOR IMPACT DRILLING IN ROCKS
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机译:岩石冲击钻探用螺纹连接
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摘要
In percussion rock drilling a screw joint for a drill run or drill string including male and female screw threads (5, 9) on the elements (1, 2) are joined together to form a drill string. Within the screw joint the male thread (5) and the female thread (9) have a trapezoidal shape and a slight conical inclination.
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