国内外天井钻机现状与展望

Current status and trends of raise boring machines at home and abroad

从钻进方式、传动关系、规格品种和结构类型等方面阐述了国内外天井钻机的发展概况，并对今后我国天井钻机的发展方向提出了看法。

The development of raise borers inside and outside china is presented,including drilling patterns,drive relations,specifications and structures. The developmental trend for raise borers in china is also discussed.