Dynamic Analysis Of The Eight-bar Linkage In Filling Bag Opening Device For Packaging Machine

A kind of synchronized opening bag agency which suitable yellow paper bag(single bag) or paper-plastic bag(double bag) was designed to achieve the yellow paper bag and paper-plastic bag opened and sealed synchronous in the filling station.The design method and dynamic characteristics of the filling open bag device for packaging machine device with the basic function and the design requirements were researched by combining the simulation and experiment, which provides some reference value for the mechanical design of the multi-bar mechanism.The main research contents in thesis are as follows:(1) The paper plastic composite bag packaging machine process and the basic mechanism of the device operation were analyzed, the dynamics model of eight-bar linkage filling bag device was established based on the characteristics of the planar linkage mechanism, and kinematics and dynamics equations of the eight-bar linkage were derived.(2) Characteristics of the eight-bar linkage in filling bag opening device were studied, and the method of the optimum design of eight-bar mechanism was given to take the institutional phase angle minimum as the objective function of the optimization model. The eight-bar mechanism design dimensions were determined by using MATLAB. Moreover, a virtual organization model in ADAMS was established to verify the rationality of the optimized design results.(3) The importance of eight-bar mechanism end suction action synchronization to mechanism design was analyzed. The virtual prototype was built, and the dynamics simulation of virtual model in Solid Works Motion was carried out to obtain the dynamic characteristic curve of the left and right suction cups at different speeds. The end open bag suction nozzle velocity and acceleration characteristics were analyzed. It is verified that the end sucker action synchronization of the filling bag opening device meet the technical requirements.(4) The influence of end suction device to speed up the process was analyzed, and the stress simulation of key parts by using Simulation Solid Works were carried out to calculate the stress, strain and the safety coefficient of the corresponding stress. Therefore, the stability of the mechanical design of the device was proved, and the effect of speed impact on the end was excluded.