一种多自由度-刚柔耦合筛分机械的构型设计与分析

Design and analysis on configuration of a multiple DOF and rigid-flexible coupling sieving machine

针对振动筛是一种通过柔性关节连接浮动中心刚体和挠性附件(如弹簧、阻尼器等)组成的刚柔耦合复杂系统,在筛面采用不同的运动形式时,将影响系统的稳定度和筛分能力。基于模块化理论,提出一种多自由且自由度间存在强耦合的振动构型,对其结构特点、筛分原理和设计理念进行了分析,并在理论上解析了筛面不同方向的运动学参数。建立虚拟样机进行仿真分析,验证了所提出的构型通过改变耦合传动比能灵活地调整筛面的运动轨迹,筛面的小幅振动有利于提高筛分效率。

Since the vibrating screen is complicated rigid-flexible coupling system whose flexible joints connect the rigid body of the floating center and the flexible parts(such as spring,damper etc.),the motion mode of the sieving surface affects the stability and the sieving efficiency of the system.Based on the modularity theory,a multiple DOF vibrating configuration with strong coupling among multiple DOF(degree of freedom)was proposed,and its structural features,sieving principle and design conception were analyzed.And then,the kinematic parameters of the sieving surface in various directions were theoretically analyzed.In addition,virtual prototype was established and simulation analysis was conducted,the results showed the proposed configuration could flexibly adjust the motion trajectory of the sieving surface by altering the coupling transmission ratio,and the small amplitude vibration of the sieving surface was beneficial to the enhancement of the sieving efficiency.