基于幅频特性的工业型弛张筛合理工作点的确定

考察了工业型弛张筛的状况, 从双质体非线性振动系统的角度分析了它的幅频特性, 绘制了计算机辅助的国产CZS系列3个规格弛张筛的幅频特性曲面, 得到了频率比z₀=0.85～0.91, 转速n=600 r/min,阻力比b=0.05,相对振幅 λ= 7～12 mm的结果提出了采用近亚共振动力状态, 即低频大振幅工作条件的建议, 完善了弛张筛在环保和节能应用中的理论和技术支持.

Determination of the operation range for flip-flow screen in industrial scale based on amplitude-frequency response

The amplitude frequency response of the flip flow screen was analyzed by combining computer aided three dimensional plot, called A3D method, for a double mass nonlinear vibration system. The optimum operation conditions of flip flow screen were found to be frequency ratio z0=0.85～0.91,rotational speedn=600 r/min,damp ratiob=0.05, relative amplitude λ=7~12 mm. The results agreed very well with from the reality as well as our previous study. A proposal of using low frequency but high amplitude technology for flip flow screen was put forward. This is essential for the fine coal wet sieving in energy saving and environmental protection field.