Optimal Design And Application Of Cushioned Package For Kitchen Appliances

Traditional kitchen electrical packaging has always been in the form of cushion and carton.At the same time,with the rapid development of film packaging,the thermal shrinkable film with high puncture resistance,tear resistance and good shrinkage is becoming more and more common.At present,some scholars have discussed the application of film packaging in household electrical appliances.In this thesis,thermal shrinkable film packaging without carton for gas cooker products is designed.The reliability of this alternative is evaluated by finite element analysis,and the multi-objective optimization design of bottom cushion structure is carried out.Shrink packaging of small-sized household appliances without cartons solves not only the shortage of raw paper resources,but also the problems of cartons susceptible to moisture and bulging.It is a new way to visualize the products,which are worth exploring creatively.Firstly,according to the characteristics of cookers,in this thesis the shrink packaging alternative without carton was designed,the product model was established by Creo 3.0,and the drop simulation under ten working conditions of "one corner,three edges and six sides" was completed by ANSYS Workbench..The reliability evaluation of the packaging alternative is completed by analyzing and observing the velocity-time curve,maximum acceleration of glass panel,equivalent stress contour of key elements and equivalent strain contour.The maximum acceleration of glass panels under ten events is obtained,the maximum stress and strain contour of key elements are analyzed.The weaker portion of the bottom cushion structure is found out,and the improvement basis for the followup optimization design was put forward.Secondly,the multi-objective optimization of the bottom cushion structure was carried out.Through the response surface optimization module,three design variables were determined according to the structural characteristics.and the constraints and objective functions were determined according to the optimization purpose.The optimization analysis of the bottom pad of the packaging alternative was completed.The optimal solution to the bottom cushion size for optimization of the objective function is obtained,and the drop simulation analysis is carried out again.By comparing the simulation results of packaging alternative before and after optimization,it is found that the mass of the optimized scheme is reduced by 4%,and the maximum equivalent stress of glass panel is reduced by 39.3%,42.0%,42.5% under the drop conditions of "edge 1","face 5" and "face 4",respectively.The overall cushioning performance is significantly improved,and the expected optimization goal is achieved.Finally,the samples for optimized packaged product were made,and the acceleration of key components in drop test was collected by data acquisition system.The simulation results were compared with the acceleration-time curves obtained by optimization simulation to verify the accuracy of the simulation results.The cushioning performance was analyzed through vibration test,pressure test and transportation test.The results show that after drop test,the drop angle of cushion liner is slightly cracked and deformed,but the product is intact and undamaged;the trend of change of acceleration-time curve acquired by drop simulation and test is very similar,and the error ratio of maximum acceleration value is less than 10%,which verifies the accuracy of simulation results;the results of vibration test,pressure test and transportation test are all qualified.It proves again that the cushioning effect of the cushioning pad of heat shrinkage packaging of cookers is good and meets the protection function of the products.It also verifies the feasibility of the packaging scheme of the heat shrinkage film of cookers,which is of profound significance to the packaging of similar products,kitchen appliances and even household appliances industry.