【作者】 毛会庆；

【导师】 王永岩；

【作者基本信息】 青岛科技大学 ， 工程力学， 2010， 硕士

【摘要】 直线振动筛有脱水、脱介、脱泥和筛分效果好等优点,是应用比较广泛的筛分产品之一。在振动筛的工作过程中,长期经受高频交变载荷的作用,筛箱的侧板、横梁等部件经常发生断裂。对于大型直线振动筛,这些问题更加突出,随着采煤机械化程度的提高,对振动筛的要求越来越大,因此,研究、设计、制造大型直线振动筛就就显得越发重要。本文以原唐山某煤炭研究院研制的27m2大型直线振动筛为研究对象,针对国产振动筛易出现的横梁断裂,使用寿命相对较短等问题,从动力学和运动学角度出发,对该振动筛的动态性能进行分析。首先本文在研究振动筛的工作原理的基础上,对筛面上物料的运动学及振动筛动力学进行了分析研究,建立振动筛的力学模型;其次采用基于有限元法的ANSYS软件对振动筛进行建模,对大型直线振动筛进行静力学、模态、时间历程响应分析,与试验模态分析相结合,优化结构,确保振动筛能正常工作。最后针对大型直线振动筛使用寿命低的特点对振动筛重点位置进行疲劳寿命预测,为振动筛的设计、安装、使用提供参考。本文采用有限元分析和实验模态分析等动态设计方法,为解决振动筛强度问题提供了一种新的结构改进方案,对振动筛的设计和制造具有指导意义。更多还原

【Abstract】 The linear vibration screener with advantages of dehydration, sculping, desliming and effective screening ,is used widely for screening products. During the working process,the main parts of vibration screener endure long time high-frequency alternating loads,often resulting in crack on lateral board and beams. The strength problem is much more serious for large-scale linear vibration screener. With the increase in coal mining mechanization, the requirements on the vibration screening machine are increasing, therefore, the research,design, and manufacture on the large-scale linear vibration screener has become more important.In this paper, a 27 m2 large-scale linear vibration screener were developed by the original Tangshan Coal Research Institute as the research object. In the view of the proning to beam fracture and the short operation life in domestic vibration screeners, from the perspective of dynamics and kinematics, this paper has dong dynamic performance analysis on the vibration screener. Firstly, in the study on the basis of working principle of vibration screener. Learn the kinematics of materials on the surface of screener and kinetics analysis of vibration screener, building the mechanical model of vibration screener; Secondly, The finite element analysis ANSYS software was applied to establish the finite element model of vibration screener. Deduced the static, modal, time-history of response, by the combining with experimental modal analysis. the structure has been optimized to ensure the vibration screener normal operation. Finally, for the low life of large-scale linear vibration screener, forcast the fatigue life of key location on the vibration screener, for reference. design, installation, use of vibration screenerIn this paper, the finite element analysis and experimental modal analysis are used to solve the strength problem of vibration screener, It is provides a new structure modification program for solving vibration screener strength problem,and is meaningful for the design of vibrating screens.更多还原