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专利号:89 2 14200.6 申请日:1989年7月15日申请人:西安石油学院说明书摘要:本实用新型适用于外排屑深孔钻,利用负压机理改善外排屑深孔钻的排屑条件,有助
The patent application number: 89 2 14200.6 Application Date: July 15, 1989 Applicant: Specification of Xi’an Petroleum Institute Abstract: The utility model is suitable for the deep-hole drilling with external chip removal, and the negative pressure mechanism is used to improve the chip removal of the deep-hole drilling of the outer chip. Condition, helpful