筒式网振动筛固相运移动力学研究

Solid conveyance dynamics of shale shaker with roller screen

介绍了一种用于钻井液振动筛的新型筒式结构筛网 ,这种筛网工作时与筛箱一起振动 ,同时还绕自身轴线作为旋转运动 ,具有自洁作用 ,可大大提高筛分效率。为了定量分析固相颗粒在筒式筛网上的运移规律 ,对固相颗粒在筒式筛网上的受力情况进行了分析 ,建立了固相运移动力学模型 ,提出了筒式筛网的抛掷指数、抛掷运移速度及其计算方法 ,讨论了筒式筛网的旋转角速度对固相运移速度的影响 ,给出了旋转角度的极限值计算公式。理论计算结果与试验结果吻合较好。

A new kind of roller structure screen of drilling fluid shaker was introduced.When this kind of screen works,it vibrates with the shaker deck and slowly rotates around its axis.So,it can be cleaned by itself and improve screenging efficiency greatly.In order to quantitatively analyze the regular conveyance pattern of solid grain on the roller screen,the forces acted on solid grains on the screen were analyzed.The model for solid-phase conveyance dynamics was built.The throwing coefficient,conveyance velocity of solid grain on roller screen and their calculating methods were given.The influence of rotating angle velocity of roller screen on solid-phase conveyance velocity was discussed.The formula for calculating the maximum rotating angle velocity of roller screen was presented.The calculating results are coincident with the experimental results.The research conclusions can be applied to selection of structural parameters and dynamic parameters in the design of roller screen shale shaker.