叶板式饲料混合机混合机理分析与参数优化

发布时间：2018-08-12 07:51

【摘要】：针对我国饲料混合机的发展需要及其混合机理的研究现状,对叶板式饲料混合机进行了机理分析与参数优化。通过理论分析和高速摄像研究,按物料运动特征将混合室内物料分布区域划分为蠕动区、滑动区、抛落区,其中蠕动区以剪切混合为主,滑动区以较强的剪切混合为主,抛落区以较强的剪切混合与扩散混合为主、伴随较弱的对流混合,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。在物料充满系数为65%的条件下(通过预试验确定),以影响混合过程的主要因素——叶板宽度、转子转速、混合时间作为试验因素,以变异系数作为评价指标,采用三因素五水平正交旋转组合试验方法进行试验。结果表明:各因素对变异系数的影响由大到小依次为转子转速、混合时间、叶板宽度;当试验参数组合为叶板宽度138 mm、混合时间4.7 min、转子转速32.5 r/min时,变异系数为3.11%。
[Abstract]:In view of the development needs of feed mixer in China and the research status of its mixing mechanism, the mechanism analysis and parameter optimization of blade plate feed mixer were carried out. Through theoretical analysis and high speed camera research, the distribution area of materials in mixing room is divided into creep zone, sliding zone and falling area according to the characteristics of material movement. Among them, shearing mixing is dominant in creep zone and strong shear mixing is in sliding zone. The falling zone is dominated by strong shear mixing and diffusion mixing, accompanied by weak convection mixing, and the location, size and shape of each region are greatly affected by the structure and operation parameters. Under the condition of material filling coefficient of 65% (determined by pre-test), the main factors affecting the mixing process, such as blade width, rotor speed and mixing time, are taken as test factors and coefficient of variation as evaluation index. Three factors and five levels of orthogonal rotation combined test method was used to carry out the test. The results showed that the influence of various factors on the coefficient of variation was the rotor speed, mixing time and blade width, and the coefficient of variation was 3.11 when the test parameters were 138mm for the width of the blade plate, 4.7 minutes for the mixing time and 32.5 r/min for the rotor speed.
【作者单位】：东北农业大学工程学院;农业部生猪养殖设施工程重点实验室;
【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

【相似文献】