质心偏移式等质量矩双轴振动筛运动特性研究

Research on Motion Character of Two-axle Vibrating Screen with Same Mass Moment and Mass Center Deviated Vibrator

通过分析直线振动筛电机的安装方式,提出了一种质心偏移式直线振动筛,建立了该振动筛的力学模型和运动微分方程,讨论了合成质心的运动及其影响因素,分析了筛箱上特征点的运动轨迹及变化规律。研究结果表明:质心的偏移不影响质心的运动,只影响筛箱的扭转振动;筛箱上除质心外的各特征点运动轨迹为椭圆,但椭圆短轴很小,可将其近似看成为直线;质心两侧筛面水平位移较大,质心正下方最小,而垂直位移由质心一侧到另一侧逐渐增大。研究结果可用于指导研制结构简单、安装制造方便的高效振动筛。

By analyzing the way of installing vibrator of linear vibrating screen, a kind of vibrating screen with mass center deviated vibrator was put forward. Its mechanics model and motion differential equations were established. The motion and its influence factors of composed center of masses were discussed. The motion trail and its changing laws of shaker deck were analyzed. Research results showed that the deviation of mass center had no influence on its motion, only had influence on torsion vibration of deck. Except the center of mass, the motion trails of deck were ellipses, but the length of short axle was very small, the motion trails could be regarded as approximate lines. The horizontal displacement was bigger on both sides of mass center, and smallest below the center of mass, while vertical displacement gradually became bigger from one side of mass center to another. These research results could be used as reference for development of high efficiency vibrating screen with simple structure and convenient manufacture.