基于镜像对称补偿技术的脱皮机转子结构优化研究

Rotor structure optimization of peeling machine based on mirror symmetry compensation technology

为解决谷物脱皮机转子径向膨胀变形的瓶颈问题,根据转子的实际尺寸,建立了转子的有限元模型,对转子的受载特性进行了研究,并对纵梁的变形分布数据进行了拟合。首先,采用两步式策略优化方法及镜像对称方法对模型进行了结构补偿,对转子所受离心载荷进行了计算,确定了p i的取值范围,同时确定了其安全系数及许用应力范围;其次,确定了纵梁扫掠路径的描述函数,采用灵敏度分析方法对参数进行了筛选,采用中心复合设计方法生成了样本;最终得到了3个候选点,对优化结果进行了分析,结果表明:当p 1=1.0990 mm,p 4=3.3011 mm,p 5=4.5004 mm,p 6=3.6038 mm,p 7=2.7477 mm,p 8=2.1978 mm时,纵梁平直度最好,安全系数最高;经补偿,脱皮机转子结构的最大应力降低了12.89%;其最大变形量降低了11.31%;Str值下降了64.30%;安全系数提升了14.78%。研究结果表明:采用镜像对称补偿技术解决脱皮机转子的径向膨胀变形的方法是可行的。

In order to solve the bottleneck problem of radial expansion deformation of the rotor of grain peeling machine, the finite element model of the rotor was established according to the actual size of the rotor, the load characteristics of the rotor were studied, and the deformation distribution data of the longitudinal beam were fitted. First, two-step strategy optimization method and mirror symmetry method were used to compensate the structure of the model: the centrifugal load of the rotor was calculated, the range of pi, the safety factor and allowable stress range was determined. Then, the description function of longitudinal beam sweeping path was determine. Finally, the sensitivity analysis method was used to screen the parameters, and the central composite design method(CCD) was used to generate samples. The results shows that when p1=1.099 0 mm, p4=3.301 1 mm, p5=4.500 4 mm, p6=3.603 8 mm, p7=2.747 7 mm, p8=2.197 8 mm, the longitudinal beam has the best flatness and the highest safety factor. After compensation, the maximum stress of the rotor structure is reduced by 12.89%, the maximum deformation is reduced by 11.31%, the Str value has reduced by 64.30%, and the safety factor is increased by 14.78%. The mirror symmetry compensation technology is effective and feasible for solving the radial expansion deformation of the rotor of the peeling machine.