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双轴变椭圆振动筛的主要特点是筛面抛掷指数从泥浆入料端到出料端 由大到小递减，在泥浆入端具有较大的抛掷指数，能有效地提高固液分离速度，减少钻井液沿筛面的流程分布；出料端抛掷指数较小，可减少岩屑颗粒的硫碎和透筛量；同时，岩屑沿筛面的运移速度基本保持不变，可保证岩屑顺利排除，并避免了平动筛在出料端输送能力过剩。因此提高了振动筛的处理能力。文章介绍了该筛的工作原理，筛面运动参数的仿真，讨论了力心与质心的相对位置关系对筛面运动规律的影响。给出的结论可以直接指导双轴变椭圆振动筛的设计和研究。

The Principle and Simulation of Two-axle Excitation Variable Elliptic Motion Shaker

Two axle excitation variable elliptic motion shaker is characterized by this main point as follows:the throwing index on the screen surface becomes smaller and smaller from the end of entrance to that of discharge.The bigger throwing index at the end of entrance can effectively increase the detaching speed of solids from fluids and also cut down the flowing distance of drilling fluids on the screen surface.The smaller throwing index at the end of discharge can decrease the amount of solids broken and thrown through the screen.At the same time,solid conveyance speed is almost kept at a certain level on the surface of screen,which makes solids discharge smoothly and avoids the superfluous conveyance at the discharging end of balance elliptic shaker.Therefore,this shaker can improve the ability of dealing with drilling fluids.It is then discussed the working principle of this shaker,the motion simulation of screen surface and the effects on the motion regularity by the different distances between the center of excitation force and the mass center of the shaker box.Results given out can be relied on to help in designing and studying on the two axle excitation variable elliptic motion shaker.