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LH overhead crane with electric hoist has the advantages of compact external dimensions, small clearance height of the building, light self-weight, small wheel pressure and so on. It is applicable for transfer, assembly, maintenance and loading and unloading operation of the mechanical processing workshop, auxiliary workshop of the metallurgical plant, warehouse, material yard, power station and so on; it can also substitute the ordinary double-beam bridge crane, and is used in the production workshop. The work type is divided into the light level and medium level, the operating ambient temperature is -25℃~40℃, and use in the combustible, explosive and corrosive medium environment is prohibited.