Modeling Investigation On The Dynamics Of Intermittent Chain

The actuating mechanism of many automatic machines is implemented by chain drive, the chain drive performed the intermittent motion as the output mechanism in this kind of machine, which transferred the materials and semi-manufactured goods needed to be processed to anticipative position in order to the other part of this automatic machine finished the corresponding workThe intermittent chain is applied in medicine, foodstuff and the assembly machine of electronic element widely, but the dynamics research about this kind of intermittent chain is almost blank at home. In this paper, it takes the intermittent chain as object to establish the dynamics model and analyze the dynamics characteristic in order to provide us with theory foundation for enhancing the design level of this kind of machine products.In order to making the research problems have generality, we neglect the guide form, the rows of chain and sprocket difference between the drive wheel and driven wheel, etc, and take the realization of intermittent motion as main characteristic to establish the dynamics model with lamp. The dynamic equation of this system was established through applying the finite element method to make the chain discretize into the combined body of a great number of basic units connected with node and regarding each basic unit as to the pole unit of longitudinal vibration. On the basis of above analysis, this paper takes the mode superposition method to solve the dynamic equation.The system dynamic model is established considering motor and the corresponding differential equations are obtained. The mechanism position is discretized for applying the mode superposition method and numerical method to solve the equations.Considering the damp and motor, when the modified sine curves, the modified constant velocity curves and the modified trapezoid curves, etc, are adopted for implementing the intermittent motion, the acceleration response's difference of chain link for the chain system is analyzed, and the acceleration response's variety of different linkfor the same notion curves is also discussed.The modeling method for the intermittent chain presented in this paper has profound meanings for the further study. Some valuable conclusion drawn from above discussion can be provided for dynamics analysis and engineering design of the intermittent chain.