Impact Dynamics of High-speed Metamorphic Mechanism for Comber
Comber is the key equipment to produce yarn with high quality and the development tendency of this kind of machine is high speed.Nipper mechanism in comber is a typical constrained metamorphic mechanism and jaw impact force generated at the time of configuration change has a negative effect on nipper opening-closing time and combed product property.Therefore,how to effectively reduce the impact force by optimizing the parameters of nipper mechanism has become an important and chief research topic which must be solved urgently.Firstly,the structure of Nipper mechanism with geometric and force constraints is analyzed and dynamics models of each sub-configuration are established by using Lagrange equations.Secondly,it is proposed to connect metamorphosis with topology and multi-body dynamics to reveal the principle of impact motion of metamorphic mechanism at the time of changing configuration.A contact force with hysteresis damping factor is introduced as an external force to analyze the impact process between nipper knife and nipper plate during configuration change.The result obtained is compared with impact impulse method and virtual simulation to verify the effectiveness of models established.Finally,according to the study of impact dynamic modeling and optimum design of nipper mechanism,important theoretical foundation will be provided for design of comber with high efficiency and low energy consumption.
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