一、前言跳汰选矿具有处理量大、选别粒度范围宽、操作简单、设备维护方便等优点,长期以来在钨、锡、金及煤等选别中得到了广泛的应用。但传统的跳汰机多是采用偏心连杆机构带动隔膜运动,水流脉动呈正弦对称周期。实践证明,这种脉动曲线不宜以宽级别物料入选,对-2毫米细粒级选别效果较差,而且筛上粗粒精矿一般不能连续顺利排出, I. Introduction Jig dressing has the advantages of large processing capacity, wide range of sorting and sorting, simple operation and convenient equipment maintenance. It has been widely used in the sorting of tungsten, tin, gold and coal for a long time. However, the traditional jig is the use of eccentric linkage mechanism driven diaphragm movement, water flow was sinusoidal symmetrical cycle. Practice has proved that such a pulsation curve should not be a wide selection of materials, the classification of -2 mm fine grade less effective, and the sieve coarse ore concentrate generally can not be discharged smoothly,