Dynamic Analysis Of Key Mechanism Of High Speed Corrugating Machine

With the rapid development of express industry and environmental requirements getting increasingly strict.The demand for corrugated cardboard with the advantages of green environment protection and recyclability has been increasing continuously,and the price of raw paper materials is also rising,which promote the development of corrugating machine towards high speed and low weight.However,In the improving process of corrugating machine,the corrugating machine has the problems of excessive vibration and poor uniformity of base paper forming.In order to improve the competitiveness of products in domestic and foreign markets,these problems need to be solved urgently.Base on this,the dynamics of the key mechanism of corrugating machine was studied by combining theory,simulation and experimental methods.The formed corrugated base paper needs to be bonded with facing paper through the action of pressure roll.Thus,the vibration characteristics of pressure roll mechanism determine the bonding strength of corrugated cardboard.In order to analyze the cause of the vibration,the dynamic model of pressure roll mechanism was established.Then a vibration differential equation of mechanism was established based on Lagrange principle.The generalized HERTZ contact theory was used to calculate the contact stiffness and contact damping of vibration model.The change of center distance between the pressure roller and the upper corrugating roller was used as the displacement excitation,then the natural frequency and vibration response of new pressure roller mechanism was obtained.So as to provide a theoretical foundation for the analysis of vibration characteristics of pressure roll mechanism.A vibration test was conducted on the pressure roller mechanism.According to the experimental requirements.The test scheme was designed,and the vibration signal acquisition program was compiled based on the software of LABVIEW.The least square method and fivepoint cubic smoothing method were used to eliminate the trend term and high frequency random noise signal in the vibration signal.The acceleration obtained from the vibration test was compared with the theoretical analysis curve.Besides,a spectrum analysis was carried out.The accuracy of dynamic model was verified,which provides a theoretical reference for optimizing new pressure roller mechanism and reduce vibration.As one of the key mechanisms of corrugating machine,corrugated roll determines the quality of corrugated base paper.The convex curve of the corrugated roll has a great influence on the contact performance of the corrugated roll.Firstly,the mechanical model of corrugated roll was established according to the theory of material mechanics,then the convex curve of corrugated roll was obtained.After that,the contact performance of corrugated rollers was simulated and analyzed.The shortcomings of the convex curve design method were found.Finally,based on the uniform contact of corrugated roller,a new design method of convex curve was proposed.It effectively improves the contact performance and production width of corrugated rollers.The dynamics and meshing characteristics of corrugated rollers were analyzed.The change of center distance of corrugated roll was analyzed under ideal meshing condition,then the calculation formula of center distance was obtained.In addition,a multi-body dynamics simulation of corrugated roll mechanism was carried out based on ADAMS software.It was found that the change of the center distance of corrugated roll was related to the rotational speed and the pressure of the air spring.It provides a theoretical basis for reducing the vibration impact of corrugated rollers and improving the motion stability of corrugated rollers.