差动式干选机分选床运动特性分析

Kinematic characteristics analysis of differential dry separator sorting bed

针对差动式干选机零部件强度计算、生产参数调节困难的问题,对差动式干选机分选床运动特性进行了研究。运用机械动力学理论建立了分选床的力学模型和运动微分方程,运用数值模拟技术研究了不同相位角、角频率之比、偏心质量矩之比对差动系数的影响。研究结果表明:干选机零部件所受激振力为两个简谐力叠加而成的复合谐波规律驱动力;激振器初始相位角为180°,高速轴与低速轴角频率之比为2,偏心质量矩之比为1/4左右时差动系数最大,最有利于提高干选机的分选效率;研究结果对差动式干选机的设计以及生产参数的调节具有一定的指导意义。

Aiming at the difficulty in calculating the strength of components and adjusting the production parameters of differential dry separator, the kinematic characteristics of the sorting bed of differential dry separator was studied. The mechanical model and differential equation of motion of the separating bed were established by using the theory of mechanical dynamics. The influence of phase angle, angular frequency ratio and eccentric mass moment ratio on differential coefficient were studied by numerical simulation. The results show that the excitation force on the components of the dry separator is a composite harmonic law driven by two simple harmonic forces. When the initial phase angle of the exciter is 180 degrees, the ratio of angular frequency of high speed shaft to low speed shaft is 2, and the ratio of eccentric mass moment is about 1/4, the differential coefficient is the largest, which is most conducive to improving the sorting efficiency of the dry separator. The research results have certain guiding significance for the design of differential dry separator and the adjustment of production parameters.