Flow line is also called assembly line, an industrial production method, which means that each production unit only focuses on a certain segment of the work to improve efficiency and production; according to the conveying method of flow line can be broadly divided into: belt flow assembly line, plate chain line, multi-speed chain, plug-in line, mesh belt line, suspension line and roller flow line, which are seven types of flow line. It generally includes traction parts, load-bearing components, driving devices, tensioning devices, redirection devices and supporting parts. The line is highly scalable and can be designed according to demand in terms of conveying volume, conveying speed, assembly stations, auxiliary parts (including quick connectors, fans, lights, sockets, process boards, shelving tables, 24 V power supply, wind batches, etc.), so it is widely welcomed by enterprises; the line is an effective combination of man and machine, fully reflecting the flexibility of the equipment, which organically combines the conveying system, accompanying fixtures and online special machines, testing equipment, to meet the requirements of multiple product varieties. to meet the requirements of multi-species product conveying. The conveying line can have synchronous transmission / (forced) or non-synchronous transmission / (flexible), and according to the choice of configuration, it can realize the requirements of assembly and conveying. Conveyor lines are indispensable in the mass production of companies.