混凝土振动搅拌机轴端密封结构的分析与设计

发布时间：2018-03-28 03:03

本文选题：混凝土　切入点：振动搅拌　出处：《长安大学》2015年硕士论文

【摘要】：双卧轴混凝土振动搅拌机具有搅拌质量好、生产效率高等众多优点,已经开始应用于各类大型水泥混凝土施工工程。然而,轴端密封问题是限制混凝土振动搅拌机市场推广的一个重要因素,迫切需要一种可用于混凝土振动搅拌机的新型轴端密封结构。本文按照“提出问题——分析问题——解决问题”的研究思路,采用文献分析、列举、对比、理论分析、仿真分析、试验研究等方法,对混凝土振动搅拌机动态轴端密封问题进行了研究。在分析问题阶段,首先对动态轴端密封问题的特殊性进行了分析,指出了动态轴端密封结构要解决的三个问题;然后从密封结构及其原理、零件的制造精度及存储、搅拌轴系的振动和动平衡、搅拌轴系受力后的形变和搅拌装置五个方面对动态密封技术的影响因素进行了分析;最后,介绍了现有动态轴端密封技术,陈述了其密封结构和原理,探究了轴端密封失效的外在表现和内在原因。结构设计阶段,按照“设计计划——方案设计——结构设计”的设计流程,首先,提出了设计目标和任务;然后,通过“二级评价法”在提出的多个可能方案中选取了较优方案;最后,结合列举法、对比法、经验设计法,并在理论计算中引入p?V?T?h系统设计法,完成了密封新结构设计。新结构设计完成后,通过ABAQUS有限元软件,对新结构进行了动态分析和运转状态分析,分析结果显示:新结构前六阶固有频率依次为170.14Hz、170.17Hz、187.04Hz、214.97Hz、234.67Hz、234.75Hz,与振动搅拌机系统的激振频率并不重合,可避免产生共振;弹性元件阻尼合理,且在常规冲击载荷下密封界面可保持正常工作状态;摩擦副处运动规律和实际观测情况吻合,受力状态良好。设计的新结构性能试验,混凝土振动搅拌机在实际生产环境连续100h试验中,轴端密封新结构温度和磨损量均符合要求,没有出现水泥砂浆泄漏和润滑油脂泄漏现象,试验结果表明:轴端密封新结构密封性能良好,满足设计要求,可投入工业使用。
[Abstract]:Double horizontal shaft concrete vibratory mixer has many advantages, such as good mixing quality, high production efficiency and so on. It has already been applied to all kinds of large-scale cement concrete construction projects. The problem of shaft end seal is an important factor to restrict the market popularization of concrete vibratory mixer. There is an urgent need for a new type of shaft end sealing structure which can be used in concrete vibratory mixer. According to the research idea of "posing problem-analyzing problem-solving problem", this paper adopts literature analysis, enumeration, comparison, theoretical analysis, simulation analysis, In the stage of analysis, the particularity of dynamic shaft end seal is analyzed. This paper points out three problems to be solved in dynamic shaft end sealing structure, and then from the aspects of sealing structure and its principle, manufacturing precision and storage of parts, vibration and dynamic balance of stirring shafting, The influence factors of dynamic sealing technology are analyzed from five aspects: deformation of stirring shaft system and stirring device. Finally, the existing dynamic shaft end sealing technology is introduced, and its sealing structure and principle are described. In the structural design stage, according to the design flow of "design plan-scheme design-structure design", the design goal and task are put forward firstly. Through the "two-level evaluation method", the best scheme is selected among the several possible schemes put forward. Finally, combining the enumeration method, the contrast method, the empirical design method, and the introduction of p? V? T? H system design method. After the new structure design is finished, the dynamic analysis and operation state analysis of the new structure are carried out by ABAQUS finite element software. The analysis results show that the first six natural frequencies of the new structure are 170.14Hzn 170.17Hzn 187.04Hzn 214.97Hzn 234.67Hzn 234.75Hzin, which does not coincide with the exciting frequency of the vibratory mixer system and can avoid resonance, and the damping of the elastic element is reasonable. The sealing interface can be kept in normal working state under conventional impact load, and the motion law of friction pair is in good agreement with the actual observation, and the stress state is good. The new structure performance test is designed. In the actual production environment of the concrete vibratory mixer for 100h, the new structure temperature and wear quantity of the shaft end seal meet the requirements, and there is no leakage of cement mortar and lubricating oil. The experimental results show that the new structure seal of shaft end seal has good performance and meets the design requirements and can be used in industry.
【学位授予单位】：长安大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TU642

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