Qy-type insulated hook bridge crane, suitable for smelting aluminum, magnesium and other electrolytic nonferrous metal materials factory workshop. This crane consists of four parts: box bridge, big car running mechanism, trolley and electrical equipment. In order to prevent in the process of work, the current on charged by lifting to crane, endanger the life and safety equipment of the driver, at proper positions of the crane, several insulation devices are set up. This crane is a heavy duty working system. To ensure lifting safety, the main lifting mechanism is equipped with double brakes. All the agencies operate in the driver's room.