基于柔性动力学的辊道窑烧结过程匣钵运动特性分析

盛装锂电正极材料的匣钵在辊道窑烧结过程中极易出现异常横向运动,为此基于柔性动力学分析辊道柔性对传动过程匣钵运动特性的影响。首先,基于柔性动力学建立匣钵-辊道传动动力学简化模型,分析辊棒弹性变形及传送时匣钵运动特性,并通过实验验证了模型的有效性;其次,建立相应的匣钵-辊道刚体动力学模型,通过对比分析刚性和柔性两种辊棒传送条件下匣钵运动特性的变化以及不同辊棒挠度下匣钵横向运动的变化,揭示辊道柔性对匣钵运动特性的影响。在此基础上,对原有辊棒进行了改进并开展实验验证改进方案的效果。结果表明:由于弹性变形的影响,匣钵在前行的同时,匣钵之间间隙出现了明显向外扩张趋势,而当辊棒呈现刚性时匣钵则几乎无外扩现象;辊棒挠度对横向运动有重要影响,在辊棒挠度从0到2 mm区间变化时,其匣钵扩展间隙随挠度增加而呈增大趋势,而当辊棒挠度超过2 mm后,匣钵扩展间隙随挠度增加反而呈减小趋势。改进实验效果表明,适当增大辊棒刚度可显著减轻匣钵异常横向运动现象。

Motion characteristic analysis of saggar during the calcination process in roller kiln based on flexibility dynamics

The saggar that contains Li ion battery cathode material is prone to abnormal lateral movement behavior during the calcination process of roller kiln. So, in this paper, the influence of roller table flexibility on the motion characteristics of the saggar in the driving process is analyzed based on flexibility dynamics. Firstly, a simplified model of the saggar roller table driving dynamics is established based on flexibility dynamics. Using this model, the elastic deformation of the roller and the motion behavior of the saggar during transmission are analyzed, and experiment was conducted to verify the effectiveness of the model. Secondly, the corresponding rigid dynamics model of saggar roller table is established. Through comparing the kinematic characteristic variation of the saggar under the transmission conditions of flexible and rigid rollers and the lateral movement variation of the saggar under different roller deflection, the influence of the flexibility of the roller table on the saggar kinematic characteristic is revealed. Based on these, the original roller was improved, and corresponding experiment was carried out to verify the effect of the improved scheme. Results show that: Because of the influence of elastic deformation, obvious outward expansion of the gaps among the saggars occurs while the saggars are transmitted forward, however there is almost no expansion of the gaps among the saggars when the roller shows rigidity; The deflection of the roller has an important influence on the lateral movement of the the saggars. When the deflection of the roller is changed from 0 to 2 mm, the expansion gap of the saggars increases with the increasing of the deflection. When the deflection of the roller exceeds 2 mm, the expansion gap of the saggars decreases with the increasing of the deflection; The experiment results for the improved roller show that the properly increasing the rigidity of the roller can significantly reduce the abnormal lateral motion of the saggars.