Industry Assembly line includes general assembly line, branch assembly line, workshop devices and equipments used on assembly line .Flexible conveying line is adopted to transport work pieces. Automation assembly equipments are collocated to further promote efficiency. The varieties of flexibility transportation conveyor are: accumulation friction roller-bed, startstop dynamic roller-bed and non-power roller-bed etc. Dynamic roller-bed is driven by gear motor +frequency converter. Transmission speed is 3-30m/min.