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Nowadays，as more and more people eager to travel, the security check problem occurs inevitablely during their journey. For example, it is difficult for tourists to put their heavy bags on high conveyor belts, or for elders and pregnant women to bent down and put their luggage on low belts.It is laborious and time-consuming to put the suitcase on the conveyor belt while taking heavy luggage through the security machine. Using double screening machine can save energy and improve the speed of security passes because heavy hand luggage will be placed in the lower belt and lightweight bags can be put on the upper belt.
Xi'an University of Technology