袁捷朝,罗 兵,毕 超,王文飞,伊大龙

响应曲面法优化同向旋转双螺杆挤出机最大固体输送量的研究

袁捷朝,罗 兵＊,毕 超,王文飞,伊大龙

(北京化工大学机电工程学院,北京100029)

采用响应曲面法对φ34 mm同向旋转双螺杆挤出机的最大固体输送量进行研究。建立了以最大固体输送量为目标函数的二次式多项数学模型,探讨了目标函数的主要影响因素及其交互作用。结果表明,模型所预测的最大固体输送量和实验值之间的误差小于10%,当螺杆转速为124 r/min、螺纹元件螺旋升角为32°、物料粒径为2.7 mm时,最大固体输送量达到534 g/min,这比优化前的最大固体输送量提高了7.2%。

同向旋转双螺杆挤出机;固体输送;响应曲面法;优化

Abstract:The maximum output of solid convey forφ34 mm co-rotating twin screw extruder was optimized by response surface methodology method.A quadratic multinomial equation model using the maximum output of solid convey as the objective function was built,and the main influencing factors and their corresponding relationships were discussed.It showed that the deviation between predicted values by the model and experimental values was less than 10%.The maximum output of solid convey was obtained as follows,screw speed was 124 r/min,the helix angle of the screw was 32°,and the diameter of the solid particle was 2.7 mm.After optimizing the factors,the maximum output of solid convey was 534 g/min and was increased by 7.2%compared with the value before optimizing.

Key words:co-rotating twin screw extruder;solid convey;response surface methodology;optimization

0 前言

双螺杆挤出机在聚合物加工中的应用十分广泛。同向双螺杆挤出机固体输送段主要使用计量加料,螺槽一般为非充满状态,其输送机理较为复杂。近年来国内外的学者也对同向双螺杆的固体输送现象和机理进行了一定的研究。Carrort等[1]认为啮合同向旋转双螺杆固体输送有2种机理,即沿螺槽方向的输送以及在上啮合区沿轴向的正位移输送,并认为上啮合区的正位移输送量就是全部的正位移输送量。Potente等[2]将输送区分成部分填充进料和完全填充压缩区,建立了力和力矩方程,求解得到最大输送量。刘廷华等[3]根据可视化实验观察有色示踪粒子的运动,建立了侧螺槽非充满散粒体态的固体输送模型,以区域型和边界型相结合的数值计算方法求解了应力场和速度场。……