Structure of Foreign and Domestic Downhole Electric Drill.
浅析国内外潜孔电钻的结构特点
The Structure Design and Manufacture of Hydraulic Rock Drill
水压凿岩机的结构设计与试制
The structure used to support the crown blocks and the drill string of a drilling rig.
用于支撑天车和钻机上钻柱的结构。
Internal Combustion Rock Drill Stem Throttle Parts of Structure to Improved Operational
内燃凿岩机柄体部件油门操作机构的结构改进
The knock preventing spanner drill chuck has simple whole structure and high clamping precision.
本实用新型整体结构简单，夹紧精度高。
Large degree of freedom of drilling frame structure can enlarger efficiently operation scope of drill rig.
多自由度钻架结构, 有效地扩展了钻机的作业范围。
Basic structure and operation principle of the parallel grinder for helical drill point grinding is presented.
给出螺旋面钻尖刃磨机床的基本结构及其工作原理。
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