LE-LB series plug-in line is composed of plug-in special guide rail, frame, circuit board adjusting device, parallel connection device, etc. According to the working mode, it can be divided into manual plug-in line and chain automatic plug-in line. Series plug-in line combination and configuration can be arbitrarily changed, plug-in line speed can be adjusted by variable speed knob, width can be adjusted at any time with the width of the circuit board, line body friction is small, low noise, no pollution to the PCB transported, widely used in the electronic industry.