Some Speed lifting Systems of domestic raise-boring machines are described. Based upon an analysis of their functions, some recommendations for their improvement are proposed.
本文介绍了国内天井钻机的几种快速升降系统及其作用并对其进行了分析，提出了改进建议。
Some Speed lifting Systems of domestic raise-boring machines are described. Based upon an analysis of their functions, some recommendations for their improvement are proposed.
本文介绍了国内天井钻机的几种快速升降系统及其作用并对其进行了分析，提出了改进建议。
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