Study On Disassembly Sequence Planning Of Waste Smartphone For Value Recycling

Disassembly and recycling are two of the most important steps throughout the life cycles of many information and communication technology products.The rapid growth in the generation of waste electronics has led to an increasing effort to develop technologies for product recovery in the form of material recycling and part reuse.Since smartphone is one of the most popular electronic devices but have a short service life,they are the fastest growing products of waste electronic and electrical facility(WEEE),and the problems of disassembly and recycling waste smartphone urgently need to be properly resolved.Currently,however,there are almost no researches for disassembly sequence planning of waste smartphone.(1)A disassembly model based on a hybrid graph of waste smartphone is established,and the connection of the smartphone is considered as quasi-parts to participate in the disassembly model.Taking disassembly time and recycling profit as optimization goals,a dual-objective optimization mathematical model is established,and multiple indicators affecting disassembly time and recycling profit are simultaneously considered.(2)Two improved algorithms are designed to optimize the disassembly sequence of smartphone,namely the improved dual-population Genetic Algorithm(GA)and improved Genetic Algorithm-Particle Swarm Optimization(GA-PSO)hybrid algorithm,and the applicability and superiority of the two improved algorithms in solving the disassembly sequence of smartphone is clarified.The “Android system”smartphone and the “i OS system” smartphone are selected for instance verification,which demonstrated the feasibility and superiority of this method.For the "MI 3" smartphone,compared with the experience disassembly and Genetic Algorithm,the two improved algorithms reduced the auxiliary disassembly time by 35.9% and 13.8%,and the recycling profit increase by 7.8% and 2.0%,respectively.For the "i Phone6" smartphone,the auxiliary disassembly time was reduced by 50.8% and 17.1%,and the recycling profit increased by 6.6% and 1.3%,respectively.Sensitivity analysis results showed that for the recycling profit of waste smartphone,the most important impact was the recycling revenue,followed by the purchase price,and the least impact is the disassembly cost.(3)The overall design of the disassembly facility of the waste smartphone is carried out,establishe the three-dimensional model of the disassembly facility,the design plan of the disassembly facility is completed,the structure of each part of the actuator are designed,and the executing process of the disassembly facility is clarified.This study provides a solution for the disassembly and recycling of waste smartphone,improving the disassembly efficiency and recycling value of waste smartphone,and realize the recycling and reuse of waste smartphone.The results of this study also provide theoretical support for a greener design for new smartphone products.