干法造纸成型圆筒的动态特性分析

Analysis on Dynamic Characteristics of Air-laid Paper Cylinder

中文关键词:  干法造纸  成型圆筒  动力学分析  振动

Key Words:air-laid paper  forming cylinder  dynamics analysis  vibration

中文摘要:

      为提高干法造纸技术生产线的工作效率和纸幅质量，根据成型布料器的气流铺网成型原理，运用ANSYS Workbench软件对干法造纸成型圆筒的动力学特性进行分析。对成型圆筒在自由状态和约束状态下的固有频率和振型进行研究，并探讨了成型圆筒转速与圆筒长度对成型圆筒最大应力和最大径向位移的影响规律。结果表明，成型圆筒在约束模态分析时的一阶临界转速和激励转速分别为967.38 r/min和725.54 r/min，且工作转速小于激励转速，因而成型圆筒在运动过程中不会产生共振现象；在工作转速300 r/min时，成型圆筒与闷头接合处的应力较大，闷头两端的应力较小，成型圆筒的中间位置变形最大，最大变形量为3.14 mm；成型圆筒的等效应力和最大径向位移随着成型圆筒转速和圆筒长度的增加而增大。

Abstract:

      In order to improve the operation efficiency and paper quality of the air-laid paper production line， the dynamic characteristics of the air-laid paper forming cylinder were analyzed by ANSYS workbench software according to the airflow forming principle of the forming distributor. The natural frequency and vibration mode of the forming cylinder in free state and constrained condition were studied， and effects of rotating speed and length of the cylinder on the maximum stress and radial displacement of the forming cylinder were discussed. The results showed that the first-order critical rotational speed and excitation speed in the constrained modal analysis were 967.38 and 725.54 r/min， respectively， and the working speed was less than the excitation speed， indicating the forming cylinder does not generate resonance in the high-speed motion. When the working speed was at 300 r/min， the stress at the joint between the cylinder and the bulkhead was large， and stressed at the ends of the bulkhead was small， the deformation of the middle position of the cylinder was the largest， and the maximum deformation was 3.14 mm， and the equivalent stress and the maximum radial displacement of the forming cylinder increase as the cylinder speed and length increased.