Experimental Study on Mixing Mechanism of Fresh Concrete in A New Type of Vertical Continuous Mixer with Gravity

1995年秋，前田先生和山田先生新开发了连续式M-Y混合机。该混合器具有串联连接的多个混合单元。立式使用时，只需在重力作用下进行混合工作，采用改进的颗粒间碰撞和冲击机制。这种连续混合器的垂直设置被称为重力垂直连续混合器。立式连续混炼机内部的混炼过程与现有混炼机完全不同。然而，混合器内部的混合过程机理尚不清楚，也无法解释如何确定混合器所组成的单元的形状和尺寸。本文的目的是弄清立式重力连续混炼机的混炼机理，为设计高性能的立式重力连续混炼机提供有用的信息。在这项研究中，在这种连续混合机的混合机制进行了实验研究，使用可视化技术。作为这项实验研究的结果，在不发生物料堵塞的前提下，物料在混合器内的堆积时间要长，下落物料的速度和角度要有很大的紊流，以增加混合效果这是连续搅拌机的效率。

In the fall of 1995, Dr.M.Maeda and Dr.K.Yamada developed continuous M-Y mixer newly. This mixer has number of mixing units connected in series. When using this mixer in the vertical way, mixing work can be done under gravity force only, with the new modified mechanism of inter-particle collision and impact. The vertical set-up of this continuous mixer is called as vertical continuous mixer with gravity. The mixing process inside the vertical continuous mixer is totally different with that of existing mixers. However, the mechanism of mixing process inside the mixer is not clear and they can't explain that how to decide the shape and the dimension of the units consisted by the mixer. The aim of this paper is to be clear the mechanism of mixing process of the vertical continuous mixer with gravity and to obtain the useful information on the design of a high-performance this continuous mixer. In this research, the mixing mechanism at work in this continuous mixer was investigated experimentally using a visualization technique.As a result of this experimental study, it is very important that the time of accumulation of materials inside mixing units is long and the turbulence of velocity and angle of falling materials is very large as far as the blockade of materials through mixing units is not happened in order to increase the mixing efficiency of this continuous mixer.