Analysis And Optimization Of Dynamic And Static Characteristics Of Aseptic Brick Package Pre-forming Mechanism

Aseptic carton packaging equipment,also known as aseptic brick packing machine,In recent years,the aseptic beverage market has developed rapidly,and the demand for aseptic brick packaging equipment has continued to increase.At present,the differences in production speed and packaging accuracy of aseptic brick packaging machines at home and abroad have caused large-scale beverage companies to generally adopt multinational equipment,which has led to a situation where the price of aseptic brick packaging drinks is high and the market competitiveness of small and medium-sized enterprises is insufficient.Therefore,the development of higher-performance aseptic brick packaging equipment is of great significance to ensure the healthy development of the domestic market.This article takes a company's BH7500 aseptic brick charter as the research object.Perform kinematics analysis on the actuator according to the kinematic characteristics of the pre-forming mechanism,and analyzes the cause of the movement distortion of the aseptic brick package pre-forming mechanism at high speed through ADAMS simulation analysis;in order to ensure the performance requirements of parts and the dynamic stability of the mechanism,ANSYS Workbench is used to perform static analysis,modal analysis,and topology optimization on some parts.Based on the simulation results,the optimization design is carried out.At the same time,the influence of the component parameters on the dynamic response of the actuator terminal is studied through the establishment of a dynamic model and a harmonic analysis method.The main research content and research results are as follows:(1)Dynamic simulation of pre-forming mechanism of aseptic brick packing machine based on ADAMS.According to the working conditions of the pre-forming mechanism of the aseptic brick package,ADASM is used for dynamic simulation to obtain the speed and force curves of swing arms,vertical shafts and other parts,and to study the causes of instability of the mechanism at high speeds.The results show that the numerical relationship between the vertical axis displacement and the swing arm angle can simplify the design process of cam thrust angle;under actual working conditions,the positions where the high pair fails are at the bag inlet and the bag outlet respectively,and the gripper jaws move smoothly in the constant velocity section;the contact load between the cam and the swing arm roller varies greatly during the working cycle,and the maximum contact force is close to 10000 N.The movement instability of the preforming mechanism is mainly caused by the unreasonable design of the cam thrust angle and the insufficient spring stiffness of the swing arm.(2)Analysis of dynamic and static characteristics of preforming mechanism based on ANSYS Workbench.Through static analysis to study the stress and strain of the preformed mechanism components under different working conditions,the vibration characteristics of the preformed mechanism are studied through modal analysis,and lightweight suggestions are put forward based on the results of topology optimization.The results show that all components meet the strength requirements,but the drive connecting rod,swing arm and other parts have large displacements,and the structural performance of the support base meets the design requirements;the first 6-order natural frequency range of modal analysis calculation is64.55?198.4Hz,the excitation at the actual speed is less than the natural frequency,and the equipment will not resonate at higher speeds;the lightweight model is obtained through topology optimization,and there is still room for improvement in the structure of the yoke,support base and other components.(3)Optimized design of pre-formed cam.According to the ADAMS simulation results and process requirements,fine-tune the motion parameters of the mechanism and select the appropriate motion law,taking the minimization of the dynamic and static load ratio as the design principle,the dimensional parameters of the cam are recalculated and the threedimensional model of the component is recalculated,and various parameters of the cam are optimized.The results show that the radius of curvature and pressure angle of the optimally designed cam meet the design requirements,and the parameters such as the similar speed and the similar jerk indicate that the stable movement of the preforming mechanism can be realized.(4)Dynamic analysis of pre-formed high-speed cam mechanism.According to the movement relationship of the various components of the preforming mechanism,the mathematical analysis of the displacement of the working end is solved by the complex vector method,by establishing a dynamic model to study the influence of parameters such as mass and stiffness on the movement deviation,the harmonic analysis method is used to study and optimize the movement deviation of the gripper jaws in the full working cycle of the cam-driven mechanism.The results show that the reduction of the quality of parts is beneficial to reduce the response error of the mechanism at high speed;the movement deviation of the gripper meets the design standard,and the end gripper of the actuator can achieve precise positioning.