基于相对滑移理论的管带机直线爬坡段极限输送倾角研究

Research on limit conveying inclination in circular climbing section of pipe belt conveyor based on relative slip theory

输送倾角是圆管带式输送机直线爬坡段设计中的关键难点,过大会发生胀管事故,过小则需重新布局管线导致整机成本大幅增加。基于相对滑移理论,构建了管带中物料的力学模型,采用导来摩擦因数表征物料与管带之间的滑移状态,推导不同填充率下导来摩擦因数与极限输送倾角之间的关系。然后针对50%,62%,75%三种典型填充率下某型圆管带式输送机运行工况,分析得出导来摩擦因数与输送倾角的函数关系,根据物料与圆管之间不发生相对滑移的基本准则,从而分别确定管带机的极限输送倾角为32°,34°,36°。该方法可为圆管带式输送机直线爬坡段物料输送倾角的设计与分析提供参考。

Conveying inclination is the key difficulty in the design of straight-line climbing section of pipe belt conveyor.Expansion accidents occur during assembly if the inclination is too large.It will be necessary to re-layout the pipeline if the inclination is too small,so that the cost of the whole machine will increase significantly.In this paper,the relative slip theory is used to build a mechanical model of the material in the pipe.The friction coefficient is used to characterize the slippage between the material and the pipe.The relationship between the friction coefficient and the ultimate transport angle under different loading rates is deduced.Then,the transport inclination of the belt conveyor under three typical filling rates of 50%,62% and 75% were analyzed,respectively.The coefficient of friction coefficient and the transport inclination angle were derived.According to the relative slip between the material and the tube,the ultimate conveying inclination of the belt conveyor are determined as 32°,34°and 36°,respectively.The method has some reference values for the design and analysis of material conveying inclination in the straight line climbing section of pipe belt conveyor.