螺旋沟槽单螺杆挤出机双螺棱推动理论模型的研究

Study on Double-flight Driving Theoretic Model for Helically Grooved Feed Single-screw Extruder

通过在单螺杆挤出机固体输送段机筒内壁开设螺旋沟槽,建立了将机筒与螺杆视为一个对物料协同作用的整体的新型物理模型——弧板模型;同时将嵌入机筒沟槽与螺杆螺槽中的物料视为固体塞,提出了新型"双螺棱推动理论",弥补了单螺杆挤出机不能实现正位移输送的传统理论缺陷;最后,通过理论分析确定了螺旋沟槽挤出机由摩擦拖曳输送向正位移输送转换的边界条件方程及正位移输送下沟槽结构参数的设计准则。

Some helical grooves were cut on the inside of feeding sleeve, so that the barrel and the screw could be regarded as an integrated system to cooperatively convey the solid materials, thus a novel physieal model known as ＂are model＂ was formulated. At the same time, all the materials between the groove and channel were considered as a solid-plug, a novel solid conveying theory known as ＂double flight driving theory＂ was proposed, which filled out the flaw in the traditional extruder in the positive conveying. Finally, the boundary conditions in the crossover from friction drag to positive conveying and the design criterion of groove structure were given.