长螺旋钻孔机临界转速的确定  

Determination of critical rotation speed of long earth boring auger

作　　者：孙景武[1] 刘帝芳 

机构地区：[1]南京建筑工程学院

出　　处：《工程机械》1992年第8期12-16,48,共5页Construction Machinery and Equipment

摘　　要：在理论分析和试验观测的基础上,建立了长螺旋钻孔机新的输土力学模型。进行受力分析时,不仅考虑了螺旋升角变化的影响,还考虑了土壤在叶片上不同半径处的下滑倾斜力、阻止叶片上升的摩擦力以及朗金土压力的影响。在此基础上,建立了长螺旋钻孔机临界转速的计算公式,从而使理论分析较传统方法更为完善。Based on theoretical analysis and experi-mental observation, a new soil-transporting me-chanical model of long earth boring auger isestablished. In this forced analysis of the newestablished mechanical model, not only the ef-fect of the spiral angle variation is considered,but also the downward slipping force on thesoil at different radius, the friction resistancerising along the blades and the 'W. J. M.Ran Kine' soil pressure. All these made thetheoretical analysis more perfect than conven-tional methods and on this basis a formula forcalculating the critical rotational speed of thelong earth boring auger is presented in this paper.

关 键 词：钻孔机 螺旋线 力特性 临界转速 

分 类 号：TU67[建筑科学—建筑技术科学]