某型包装机推手机构刚柔耦合系统动力学研究

Dynamic Study of Pusher Device System with Rigid-flexible Coupling in Packing Machine

高速状态下,柔性较小的零件作为纯刚体进行计算,其结果与实际情况有偏差.基于刚柔耦合系统动力学理论,采用有限元方法和模态综合叠加法,将刚度较小的零部件柔性化,建立某型包装机推手机构的刚柔耦合系统动力学模型.基于该模型,计算推包和折边时长臂推手的动态应力,并与ABAQUS中计算结果比较,二者基本吻合,验证了基于刚柔耦合系统动力学理论计算动态应力方法的正确性.对比研究推手机构的多刚体计算模型与刚柔耦合系统动力学模型,表明柔性长臂推手变形会引起一定的位置偏差,验证了在高速状态下该机构刚柔耦合系统动力学模型的计算结果更为准确.

At high speed, the calculated result has deviation compared with that of practical situation if the smaller stiffness parts are regarded as pure rigid body. Based on rigid-flexible coupling dynamic theory, a dynamic model of pusher device system with rigid-flexible coupling of a packaging machine was built in the finite element method and modal superposition method, and the smaller stiffness parts were softened. The dynamic stress of the pushing hands during pushing and folding procedures were calculated according to the above model. The validity of this method was verified by comparing the results with the conclusion in ABAQUS. A comparative study of the pusher device＇s multirigid-body calculation model and rigid-flexible coupling dynamics model has shown that the distortion of flexible pushing hands causes positional deviation, which verifies that the calculation result of the rigid-flexible coupling dynamics model is more accurate at high speed.