直线筛筛网的空间运动轨迹计算及仿真

Calculation and simulation on motion trajectory of straight screen mesh

为详细了解筛网在空间中的运动轨迹,根据刚体动力学理论,推导出筛网上任意点在空间中的运动轨迹方程,基于实体建模技术和虚拟样机技术对筛网上任意点进行了运动轨迹分析。结果发现:当激振力不通过振动筛机体质心且置于机体两侧时,筛网上任意点的运动是随机体质心的平动和绕各个坐标轴转动的合成运动,通过调节偏振块与振动筛机体质心的相对位置,实现筛网上任意点在激振力的作用下做椭圆率互不相等的类似椭圆轨迹运动,实现了筛网在入料口的振幅达到2mm,有利于物料分层。

In order to clearly understand the trajectory of the screen,according to the rigid body dynamics theory,the trajectory equation of the mesh was deduced. Based on virtual prototyping technique and the virtual prototyping technology,the trajectories of the points on mesh were simulated. When the exciting forces did not pass through the body＇s centroid and were placed on both sides of the body,the movement of arbitrary point on the mesh was the synthetic motion combined with translation along coordinate axis and the rotation around this axis. Through adjusting the relative position between polarized block and the centroid of the vibrating screen, the arbitrary point on mesh was moved like an ellipse with ellipticities unequal to each other, and the amplitude of screen at the entrance reached 2 mm, which is conducive to material stratification.