The shield gantry crane (DMG) is mainly used to install the cutting machine and shield machine in the underground trenchless equipment. DMG has high production efficiency, stable performance and convenient maintenance. The upper lifting device can be rotated to meet the requirements of excavation in different directions. The operation mode is flexible, the safety instructions are complete, and the device is equipped with overload protection to ensure the requirements of excavation in different directions. The electrical panel adopts PLC variable frequency controller for adjustment.