基于有限元计算的流化床振槽的结构改进分析

摘要

Vibration tank is a major part of fluidized bed. According to the maximum stress conditions ,static analysis, modal analysis and notions of the response analysis were analyzed with finite elemental method to vibration tank structure. The results showed that:The stress of vibration tank structure in fluidized bed is not well-distributed. Under the effect of sinusoidal excitation,on the edge of reinforcing plate there will be a large stress concentration. According to the stress distribution, this paper puts forward four kinds of schemes for vibration tank structure improvement ,in order to reduce the quality of vibration tank and solve the reinforcing plate crack. After comprehensive analysis ,by the way of moving reinforcing plate structure which has crack problems to the outside of the main bearing area, shortening the support span between the spring seats on the both sides,to improve the uneven structure and the performance of the vibration tank. In the end the quality of vibration tank reduced from 3 875 kg to 3 556 kg ,which is equivalent to 11.28 percent of the original quality.%振槽是流化床的主要部件。采用有限元法对流化床的振槽部分，按最大受力条件进行静力分析、模态分析和谐响应分析。结果表明：振槽的应力分布不均匀。在正弦激振力作用下，加强板边缘会有较大应力集中。根据应力分布情况，提出四种方案对振槽进行结构改进，以减轻振槽质量并解决振槽的加强板开裂的问题。综合分析后，采用把有开裂问题的加强板结构移动到主承载区域外，缩短弹簧座之间的支撑跨距并对拉筋增加肋板的方式，以改进受力不均的结构和改善振槽的整个结构性能。改进后的流化床振槽的质量从原来的3875 kg减少到3438 kg，整体质量减轻了11.28%。