One, the overview of this specification is suitable for the LD type electric single-girder crane installation, use and maintenance, for installation and maintenance personnel.1. The main use of LD type electric single-girder crane (hereinafter referred to as "crane") is designed according to standard JB/T1306-1994 used together with CD1 and MD1 model electric hoist supporting the use of the space transportation, main effect is intermittent, the workings of a cycle, by lifting hook, or other take device in a timely manner and quickly complete the displacement of the object, is a modern industrial enterprise realize mechanization, automation production process.Reduce the heavy manual labor, improve the labor productivity of important tools and equipment.2. The scope of LD type of crane is applicable to the work level A3 ~ A5, working environment temperature 25 ℃ ~ + 40 ℃, relative humidity of 85% or less of no inflammable, explosive danger under the working conditions and the corrosive medium environment.Ban lifting melting metal, toxic substances and flammable and explosive items.3. The environmental conditions (1) the power of the crane for three-phase ac, rated frequency 50 hz