Single girder Overhead Crane 1, It is light duty crane with a capacity from 1 to 20tons. The span is 7.5-22.5m. Working grade is A3-A5. Working temperature is -25¡ãC to 40¡ãC. 2, It is widely used in plants, warehouses, material stocks to lift goods. It is prohibited to use in the combustible, explosive or corrosive environment. 3, It has two operational methods, ground or operational room which has open model and close model and can be installed on left or right side according to the practical situation. 4, The direction of entering the gate has two forms, sideway and ends in order to satisfy the users, choice under different conditions. Safety-protection Measures 1, All the cranes are equipped with overload protection device, crane travelling limit switch, voltage protection function, emergency brake system and so on. 2, All operational devices are conducted by central control system