Research And Optimization Of Cam Link Mechanism Of High-speed Packaging Paper Picking Device

The paper picking device is an important part of high-speed packaging machine.The paper pick-up mechanism of the paper pick-up device removes and feeds the stacked cardboards in sequence.It has a high working frequency and requires high motion trajectory and the stability of the mechanism.Therefore,the performance of the mechanism has an important influence on the operation of the equipment.In order to obtain a paper picking mechanism with good kinematics performance,based on the research of this team,this thesis propose a paper picking mechanism in the form of a cam-link combination.The mechanism analysis and synthesis,mechanism design,kinematics analysis and kinematics optimization are carried out on the institution.The movement of the end output par of the mechanism actuator during the paper picking process is analyzed.The position and attitude requirements of the actuator in this process are obtained.The characteristics of various mechanisms are analyzed,and the mechanism original kinematic chain and topological graph of the mechanism are obtained based on the requirements of the position of the actuator.Through the evolution and analysis of the original mechanism chain,the combined mechanism form of the dual-cam conjugate control five-bar mechanism is finally obtained.This method of backward derivation can provide a new idea for mechanism designers to solve problems.According to the obtained double cam-five bar combination configuration scheme,combined with some dimensional constraints and existing research,the dimension relationship of some components is defined,and the dimensional synthesis of the mechanism is completed.The mechanism simulation model is established in UG,and the correctness of the design is verified.Finally,the kinematics model and mathematical expression of the paper picking mechanism are completed.It is concluded that in this configuration scheme,the position and posture of the actuator are controlled separately.The calculation process is simpler and the accuracy is higher,which has certain popularization significance.In order to improve the kinematic performance at the movement of the paper picking mechanism,the mechanism optimization with the minimum acceleration maximum as the goal is established.The in-depth analysis of the kinematic formula of the mechanism determined the independent variables,and the influence of these independent variables on the maximum acceleration and maximum pressure angle is analyzed.A multi-objective nonlinear constraint optimization design model is established by combining seven linear and non-linear constraints such as the constraint range of variables and the conditions of normal movement of the cam mechanism.Finally,the optimal solution is obtained by using the genetic algorithm to optimize the calculation.The calculation results show that compared with before optimization,the maximum acceleration of rods 3 and 5 is reduced by 31.5%,and the maximum acceleration of rods 2 and 4 is reduced by 44.8%.Based on the paper pickup action,the air path of the paper picking function is designed.In the UG environment,The design of the parts and the establishment of the 3D model are completed through parametric modeling Finally,the built part model is assembled into a virtual prototype according to the constraint relationship between the parts,and the actuality is summarized key technical points during assembly.