【摘要】 目前双级真空挤出机已经普遍用于砖瓦行业,挤出来的砖具有密度高、机械强度大、含水率适中且均匀、表面质量好等特点,成为今后挤出机研究的主要方向。通过对流变学和流体力学的研究,建立了泥料的弹-黏塑性模型,研究其应力-应变-时间关系,构建了砖瓦泥料的本构方程,并对影响泥料流变特性的因素做了具体分析。通过对挤出机工作原理与机构特点的不断总结,得出了影响挤出效果的主要因素,并给出了可行的控制方案。更多还原

【Abstract】 Nowadays,two-stage vacuum extruder has been widely used in brick and tile industry,and main direction in the future of extruder research is to squeeze out high density,high mechanical strength,moderate moisture content and uniformity,good surface quality’s adobe. Elastic-visco plastic model of mud was established through the study of rheology and fluid mechanics. Constitutive equation of brick and tile mud was built through studying the relationship of stress-strain-time. Effect factors of rheological properties of mud were analyzed concretely. Main factors that affecting quality of extrusion were found through analysis and research of extruder structure and actual working process. Feasible control scheme was put forward.更多还原