螺旋钻采煤机输送机构的振动频率

研究螺旋钻采煤机输送机构的振动特性,通过假设与简化建立了输送机构的振动模型,根据机械振动学原理建立输送机构固有频率和振型的数学模型,运用MATLAB软件求其前五阶的振型,获得了各阶固有振型的变化规律,分析了输送机构的结构参数和运动参数对固有振动频率的影响。结果表明：输送机构的振动频率随其长度、内径、螺旋升角和转速的增加而减小,随叶片厚度和外径的增加而增大。此研究为合理设计螺旋输送机构的结构参数、运动参数和降低输送机构及其整机的振动提供了参考。

Vibration frequency analysis of spiral conveying mechanism for coal auger

Aimed at studying vibration characteristics of a spiral conveying mechanism for a coal auger,this paper describes the development of a vibration model of a spiral conveying mechanism by simplification and assumption,and a mathematical model of natural frequency and vibration mode according to principles of mechanical vibration,introduces fifth-order vibration modes obtained by using the MATLAB software,gives each order natural vibration mode and their changes,and offers an analysis of effects of structural parameters and kinematical parameters of a conveying mechanism to natural vibration frequencies.Results show that the vibration frequency of the mechanism decreases with increment of its length,diameter,helix angle and rotating speed,and increases with addition of helical vane thickness and outside diameter.The study is of some reference values for rationally designing structural parameters and kinematical parameters of a conveying mechanism and reducing vibration of the mechanism and a coal auger.