斗式提升机的卸料方式及卸料曲线研究

斗式提升机作为一种运输设备,凭借在粉状、粒状以及小块状物料垂直提升中的良好应用效果,被广泛用于粮油、化工、建材等行业。本文就斗式提升机的卸料方式和卸料曲线展开研究,探讨并解决斗式提升机使用过程中的常见问题。

斗式提升机卸料轨迹曲线的研究

以离心式卸料为例,以单一颗粒为研究对象,分析料斗内物料受力情况;借助于计算机确定物料颗粒受力平衡临界点,得到料斗内物料颗粒开始相对滑动时的料斗相位角;推导颗粒运动微分方程并求解,从而确定卸料时物料颗粒脱离料斗边缘时的料斗相位角。用VC6.0编程求取微分方程数值解,并描绘抛料曲线,以便显示物料的卸料轨迹,为设计机头卸料罩壳提供有力的理论依据。最后,给出了绘制粮食颗粒的卸料轨迹曲线的应用程序及图形。

Water Retention Curve and Particle Breakage of Aggregates Recycled from Demolition Waste

CDW （construction and demolition wastes） present a high amount of aggregate chips covered with mortar. This results in high absorption of water with a direct impact in particle breakage or disaggregation. It is supposed that intra particle suction plays an important role in this phenomenon. However, WRCs （water retention curves） of CDW are not well understood. In this work, the WRCs of dynamically compacted specimens of aggregates recycled from the demolition of the National Stadium in Brasilia are studied. The objective of this study is to obtain WRCs of the recycled materials by using the pressure plate and filter paper methods. The breaking effect during compaction is quantified from the grain size distribution curves. The particle breakage during compaction increases when the energy is augmented. The results from the WRCs were incorporated into a pore size capillary model to predict pore size distribution.