回转式日粮混合机混合机理分析与性能试验优化

发布时间：2018-04-06 20:14

本文选题：日粮混合机　切入点：回转式　出处：《农业机械学报》2017年08期

【摘要】：针对我国日粮混合机机理研究及自主设计不足的问题,结合我国畜牧业发展的实际需要,设计了一种在筒体内壁安装抄板的回转式日粮混合机,实现日粮的均匀混合。为揭示其混合机理,利用回转式日粮混合试验装置,借助高速摄像技术对其混合过程进行了观察和分析,结果可知:按筒体内物料颗粒群运动特征可将物料分布区域划分为提料区、抛落区、回料区,其中抛落区是主混合区,其物料以剪切混合为主、以扩散与对流混合为辅,且各个区域的位置、大小、形状受结构和运行参数的影响很大;同时,以筒体转速、物料装载率、混合时间、抄板安装角和抄板高度为试验因素,以变异系数、净功耗为评价指标,采用五因素五水平(1/2部分实施)正交旋转组合试验方法进行了性能优化试验,并确定其最佳参数组合为:筒体转速23.5 r/min、物料装载率65%、混合时间4 min、抄板安装角11°、抄板高度109 mm,此时变异系数、净功耗分别为2.09%、33.734 kJ,比优化前分别降低了64.4%和15.1%。
[Abstract]:In view of the insufficient research on the mechanism and independent design of the ration mixer in our country and the actual needs of the development of animal husbandry in China, a rotary type ration mixer was designed, which was mounted on the inner wall of the barrel, and realized the uniform mixing of the ration.In order to reveal its mixing mechanism, the mixing process was observed and analyzed with the help of high speed camera technology.The results show that according to the movement characteristics of particle group in the cylinder, the distribution area of the material can be divided into three areas: the material extraction area, the drop area and the return zone, in which the main mixing zone is the drop zone, the shearing mixing is the main area, and the diffusion and convection mixing is the secondary area.The location, size and shape of each region are greatly affected by the structure and operation parameters, and the variation coefficient is taken as the test factors, such as the rotating speed of the cylinder, the loading rate of the material, the mixing time, the mounting angle of the plate and the height of the plate.The net power consumption is used as the evaluation index, and the performance optimization test is carried out by using the orthogonal rotation combination test method, which is implemented by five factors and five levels / one / two parts.The optimum parameters were determined as follows: rotating speed 23.5 rmin, loading rate 65, mixing time 4 min, mounting angle 11 掳and height 109 mm. The coefficient of variation and net power consumption were 2.09 and 33.734 kJ, respectively, which were 64.4% and 15.1kJ lower than those before optimization.
【作者单位】：东北农业大学工程学院;
【基金】：国家重点研发计划项目(2016YFD0701300) 国家自然科学基金项目(51405076)
【分类号】：S817.124

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