It is mainly composed of mast (main beam, support legs, lower cross beam, etc.), lifting mechanism, running mechanism, and electronic control part. It uses an electric hoist as a lifting mechanism, and travels along the main beam bottom flange. The truss has a light weight and strong wind resistance. The whole machine has the characteristics of light weight, simple structure, convenient installation and maintenance, etc. It is suitable for general loading and unloading and lifting work in outdoor places such as factories, mines, freight yards and warehouses within the range of small and medium lifting weights. There are three operating modes: pendant button control, wireless remote control and driver's cab. Power supply can be cable reel and high-altitude sliding wire.