Single beam grab crane with 0.5m3, 0.75m3, 1.0m3 and 1.5m3 light grab and opening and closing operation of lifting device.which is a lightweight grab lifting equipment, can be used to grab the material density of less than 1 t / m 3 the following granular or excavate loose soil,applicable from the weight of 2 tons, 3 tons, 5 tons, span 7.5 meters to 22.5 meters, the working-level A3 ~ A5, working environment temperature of -25 to +40. C. This cranes is widely for ports, railway stations, coal warehouses, construction sites and other places of underwater operations, ground handling and a cab with two forms of manipulation. According to user requirements, for users of non-standard product design and manufacturing.