The assembly line consists of a transmission system, conveyor belt, frame, electrical control system, additional facilities, etc. It can complete different production tasks in one assembly line, and multiple people can work together to complete a labor-intensive product.

The basic principle of assembly line: using the conveyor belt on the assembly line to continuously transport accessories to various workstations, the personnel on each workstation are responsible for their own work, cooperate and complete the production of the product, and then send the product to the back-end process through the conveyor belt. Academically speaking, it is to decompose a repetitive process into several sub processes, where the previous sub process creates execution conditions for the next sub process, and each process can be carried out simultaneously with other sub processes. The section with the longest execution time in each segment is the bottleneck of the entire Ningbo assembly line, and its execution time is generally referred to as the cycle of the Ningbo assembly line.