20 Ton Double Girder Overhead Crane 25m Span for Large Manufacturing Facility

Double girder overhead cranes are used when capacity and span requirements are too great for a single girder crane to be used. Double girder overhead  cranes also provide higher hook heights because the hoist is placed between the two cross girders rather than below (under the cross girder), this adds up to 3 feet more for the items lifted off the floor. Double girder overhead cranes are also excellent solutions for handling large loads with long spans. Full length walkways can also be provided for easier servicing of the crane.

             Double girder overhead crane consists of two end trucks with gear motors, two bridge girders, trolley hoist unit (or electric winch), electric panel, push button  station, which include safety equipment of cross bar limit switches, overload limiter, siren light, etc. In these components, bridge girders (main girder) are beam or box, trolley hoist is double girder, festoon flat cable power supply  system or energy chain supply power of the hoist, trolley or festoon flat cable  power supply system supply power of the crane, two-speed motors on lifting  and travelling mechanisms or stepless speed control by means of  frequency inverters, and 3 types of control for you choose: independent  overhead control box with buttons, or remote radio control, or cabin. What’s  more, in order to ensure the high-quality of our double girder overhead cranes, the parts all adopt from well-respected names. We provide maintenance and  operating pamphlet to our customers, which makes our overhead cranes become easy to hand and easy to change the parts.

            Our double girder overhead cranes are designed by professional workers to show outstanding and excellent performance. The structure of our crane kits is made of rectangular  steel tube or steel plate. Besides, the steel’s material is national standard Q345B or Q235B, which can provides more safety to the load works and prolongs our products service life. Main girder is the principal horizontal beam  of the crane bridge which supported by end trucks, and it has the function of supporting the trolley hoist. End truck is located on either side of the  bridge. The high-quality wheels of end truck ensure the whole crane to travel.  It is an important component of double girder overhead cranes, which can support the main girder or the trolley cross members. Trolley is a unit which carry the hoist mechanism to travel on the bridge rails. It is have the function of transport the load safely.

            Double girder overhead cranes also can be called bridge cranes, which consist of the  assembled structure which spans between parallel rails or runway tracks, and are  adapted to carry a suspended load horizontally along the runway. Bridge cranes can be top running or under-hung with single or double girder configurations. They also incorporate hoists on trolleys to move the load laterally as well as vertically. Bridge cranes can be mobilized via push  trucks, geared, or motorized end trucks.

          Compared with single girder overhead cranes, double girder overhead cranes have many own advantages. The maximum lifting load is more higher than others. Besides, the variable frequency control of big or small trolleys makes running become more stability, reliable and safety. The design of reasonable structure minimizes abrasion and maintenance of cranes during using, also ensures good running status of hoist.

           They are widely used in petrochemical, metallurgical workshop, machinery manufacturing shop, petroleum, building materials, ports,  electronics, paper making and other industries workshops, yards, warehouses,etc. Besides, double girder overhead cranes support CMAA Class C, D, E, F,  Mill Duty Hot metal and Magnet applications.

           They are also named Double girder top running overhead cranes, Top running Double girder overhead crane kits with hoist, Double girder bridge cranes, Double girder overhead travelling crane, Double girder bridge overhead cranes. It is a totally new but not used crane, Please check above for downloading specification, double girder overhead crane design, drawings and price will be sent on your request.