TDC plug-in flange system is one of the two major systems for flange connection in the international general pipeline manufacturing. It has the characteristics of time-saving, material-saving, high work efficiency, good sealing, sturdiness and durability, and strong connection. It is especially suitable for air ducts with large cross-sectional area of ventilation ducts. This machine can be divided into grinding wheel cutting and non-stop cutting system. Non-stop cutting system can realize cut to length. The cutting burr is small and fully automated production can be realized. Its working speed is 6 m/min.