同向旋转三螺杆挤出机固体输送段输送特性研究

基于离散元法分别对同向旋转的三螺杆以及双螺杆挤出机固体输送行为进行仿真模拟,对三螺杆挤出机颗粒速度分布以及受力分布进行分析,将三螺杆和双螺杆挤出机颗粒填充效率、输送质量以及质量流率进行对比分析.结果表明,位于螺棱和机筒附近位置的颗粒受到螺棱推力及机筒摩擦力影响较大,具有较高的速度;挤出机内部各区域颗粒填充顺序受螺杆旋转...

Research on conveying characteristics of solid conveying section of three-screw extruder

Based on the discrete element method， the solid conveying behaviors of a three?screw and a twin?screw extru?der were simulated respectively， and the particle movement trajectory， velocity distribution， and force distribution of the three?screw extruder were analyzed. The particles， filling efficiency， conveying quality and mass flow rates of the three?screw and twin?screw extruder were investigated comparatively. The results indicated that the particles located near the screw edge and barrel were greatly affected by the screw edge thrust and friction force of the barrel along with a higher speed. The filling sequence of particles in each area of the extruder was influenced by the direction of the screw rotation. The particles located in the meshing zone were affected by the spiral edge of the other side of the screw， which reduced the tendency of relative sliding between the particles and therefore improved the conveying capacity of the particles. There are more meshing areas on the three?screw extruder， so its filling efficiency is higher than that of the twin?screw extruder. As the rotation speed increases， the mass flow rates of the two extruders were improved significantly. Meanwhile， the mass flow rate of the three?screw extruder is about 25 % higher than that of the twin?screw extruder.