The forming section, sizing section and straightening section respectively including double-layer working table. The working table can be hoisted in subsection and whole when changing rollers The changement of forming stander is achieved by the drive of air cylinder .the whole forming stander can shift out.After that, anther complete set of forming stander with installed rollers can be changed quickly. The fixed side stander and the movable stander are connected with a tooth embedded clutch.it help device can be quick and accurate positioning connected The rollers of device can be adjusted and changed offline .avoid disassembly of transmission shaft’s screw. Saving time of changing roller ,improve production efficiency