饲料混合机可靠性分析与设计

发布时间：2019-06-22 09:31

【摘要】：饲料混合是饲料加工工艺中的重要组成部分,混合机也是饲料行业中占有举足轻重地位的饲料机械。其中双轴桨叶式混合机更是由于其具有混合效率高、残留量低、混合均匀度好、使用维修方便等特点,在国内外饲料加工生产中有着广泛的应用。本文将从某型号双轴桨叶式混合机的故障出发,利用可靠性理论对其可靠性影响因素进行分析,进而指导混合机可靠性的改善。主要进行了以下研究：1.掌握双轴桨叶式混合机结构及工作原理,在此基础上对混合机进行子系统划分、故障模式划分及故障编码。依据收集与整理的混合机故障信息,对饲料混合机的故障模式、故障部位、故障原因进行分析,初步获得饲料混合机的故障情况。2.依据故障信息及结构特点建立混合机的重要度模型,并运用可靠性分析方法,确定其各子系统的重要度指标,从而找出饲料混合机的薄弱系统与关键故障；根据子系统重要度指标设计子系统的可靠度分配方法,得到各个子系统的可靠度。3.针对关键部件传动轴的运动特点,分析其力学特性,再对传动轴进行弯扭组合测试获得其载荷信息,继而通过有限元分析以获得传动轴应力分布情况,最终确定传动轴失效原因。4.确定传动轴的失效原因后,结合传动轴上载荷信息和其力学特性,利用“应力—强度”干涉理论对传动轴进行可靠性改进设计：传动轴过盈连接的可靠性设计以及传动轴的疲劳强度可靠性设计。
[Abstract]:Feed mixing is an important part of feed processing technology, and mixer is also an important feed machinery in feed industry. Among them, the biaxial blade mixer is widely used in feed processing and production at home and abroad because of its high mixing efficiency, low residue, good mixing uniformity and convenient use and maintenance. In this paper, based on the fault of a certain type of biaxial blade mixer, the influencing factors of reliability are analyzed by using reliability theory, and then the improvement of reliability of mixer is guided. The following studies have been carried out: 1. The structure and working principle of the biaxial blade mixer are mastered, on the basis of which the subsystems, fault modes and fault coding of the mixer are divided. According to the fault information of the mixer collected and sorted out, the fault mode, fault location and fault cause of the feed mixer are analyzed, and the fault situation of the feed mixer is preliminarily obtained. 2. According to the fault information and structural characteristics, the importance model of the mixer is established, and the importance index of each subsystem is determined by using the reliability analysis method, so as to find out the weak system and key faults of the feed mixer; according to the importance index of the subsystem, the reliability distribution method of the subsystem is designed, and the reliability of each subsystem is obtained. According to the motion characteristics of the transmission shaft, the mechanical characteristics of the transmission shaft are analyzed, and then the load information of the transmission shaft is obtained by bending and torsional combination test, and then the stress distribution of the transmission shaft is obtained by finite element analysis, and the failure cause of the transmission shaft is finally determined. 4. After determining the failure cause of the transmission shaft, combined with the load information on the transmission shaft and its mechanical characteristics, the reliability design of the transmission shaft is improved by using the "stress-strength" interference theory: the reliability design of the interference connection of the transmission shaft and the fatigue strength reliability design of the transmission shaft.
【学位授予单位】：南京理工大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：S817.124

【引证文献】