粮油籽粒振动清理筛结构动力学特性研究

Structural dynamics characteristics of vibration cleaning screen for grain and oilseed

为提高粮油籽粒振动清理筛的可靠性和使用寿命,为振动清理筛的动力学试验研究和结构优化提供理论指导。采用三维建模软件和有限元软件建立振动清理筛的虚拟样机模型和有限元模型,并对振动清理筛整机进行了模态分析、谐响应分析。结果显示:振动清理筛在工作状态下不会产生共振,但在启动和停机过程中会产生短暂的共振,由于时间短暂,对整机结构和振动影响甚微;在工作状态下振动清理筛最大等效应力发生在橡胶弹簧与筛体之间支撑板处,该结果与文献试验测量结果吻合;振动清理筛筛体振幅为4. 11 mm,筛体前端点振幅略大于后端点,差别为2. 9%,从工程角度上可以认为振动清理筛在做往复运动。

In order to improve the reliability and service life of the vibration cleaning screen for grain and oilseed,and to provide theoretical guidance for dynamic experimental research and structural optimization design of the vibration cleaning screen,a virtual prototype simplified model and a finite element model of the vibration cleaning screen were established by three-dimensional modeling software and finite element software,and the modal analysis and harmonic response analysis of the whole structure of the vibration cleaning screen were carried out.The results showed that the vibration cleaning screen would not produce harmonic resonance under stable working condition,but it would produce short-term resonance in the start-up and shutdown process.Due to the short time,it had little influence on the structure and vibration of the whole machine.The maximum equivalent stress of the vibration cleaning screen in the working state occurred at the support plate between the rubber spring and the sieve body,and the conclusion was consistent with the literature measurement result.The amplitude of the sieve body was 4.11 mm.The amplitude of the front end point of the sieve body was larger than the rear end point slightly,and the difference was 2.9%.From the engineering point of view,it could be considered that the vibration cleaning screen was performing a reciprocating linear motion.