螺旋分选机动力学分析及参数优化探讨

为了探索螺旋分选机主要结构参数对颗粒运动规律的影响,基于螺旋线的形成特性,利用微元的思想将颗粒在螺旋槽上复杂的受力进行简化,推导出集物料性质、螺旋分选机结构参数为一体的数学模型;以1.0~0.5 mm粒度级的不同密度级粗煤泥为入料,探究了不同密度级颗粒在螺旋分选机出料端沿径向的分布情况,与数学模型分析出的结果进行对比验证,并分析了螺距、流量、螺旋槽内径和槽深等参数对颗粒达运动平衡后径向距离的影响;结果表明:提出的数学模型可以定性分析颗粒在螺旋分选机中的运动行为,颗粒密度越大,其平衡半径越靠近螺旋槽内缘;颗粒达平衡状态后的径向距离随螺距、流量以及内径的减小而减小,随槽深的减小而增加;较小的螺距、较小的内径和较大的槽深有利于粗煤泥的分选。

Dynamic and optimization analysis of spiral separator

For the purpose of exploring the effect of parameters on particle moving,the force of particles in a spiral separator was simplified based on infinitesimal method and the characteristic of spiral concentrator.The mathematical model including the particle features and the parameters of spirals was proposed to analyze the effect of parameters on particle moving.Separation experiments were conducted by using different densities materials with the size between 1.0 mm to 0.5 mm in the experimental spiral concentrator and the results were used to verify the accuracy of the model.Effect of parameters on particle moving was analyzed based on the model.The results showed that the radial distance of balanced particles decreases with the increase of the density of particles.Equilibrium radius decreases with the decrease of pitch,flow rate and internal diameter.However,equilibrium radius decreases with the increase of the depth of trough.It is beneficial to coarse coal slim separation using spiral concentrator with lower internal diameter,higher depth of the trough and smaller pitch.