LDhy type single girder electric overhead traveling crane is improved and designed by our company on the basis of LD.compared with LD type,it has the advantages of rational structure and strong rigidness of whole unit which will be used together with electric hoist in the operation.with a hoisting capacity of 1-20t,a span of 7.5-22.5M,operating level of A3-A5 and operating ambient temperature of -25-40,this crane can be extensively used in the different places such as factories ,warehouses and freight yards,etc. And according to the demand of different users,two operating modes, ground and control cabin,are provided.