This kind of production and assembly line adopts special guide rail, takes double speed chain as the transmission medium, combines electric and pneumatic control, and operates in a relatively free beat state. It is widely used in the production, assembly, debugging and testing of TV sets, displays, instruments, air conditioners, gas stoves, water pumps, automobile and motorcycle accessories, paper shredders and other products. At the same time, it can form a cross circulation production system with a hoist or a suspension line and an automatic handling manipulator;