roller gate 卷闸 ; 滚子门 ; 辊式闸门

free roller gate 辊闸门

fixed roller gate 定轮闸门

roller-bearing gate 滚轮闸门

Gate fixed roller 定辊闸门

Gate free roller 活辊闸门

roller-chain gate 链轮闸门

roller bin gate 滚筒式料仓闭锁器

wedge roller gate 楔形滚动闸门