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Since structure design of spiral door exist the flaws, they always lead to matters of folding people when people are using it.The original design of the spiral door easily folds people because the gap between the glass of door leaf and curved wall is very narrow. And human’s skin is so flexible. So people can not pull out skin from the gap. Unless we take the folder door by force to save the victim. Therefore, we try to make a flexible structure of the built in spring. When the people were jammed in the aluminum alloy doors and curved walls of glass border autonomously to pull.