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china design double girder gantry crane 20 ton

ELectric single beam gantry crane with hook is applied outside warehouse or railway sideways to do common lifting and unloading works, this kind of crane is composed of bridge, support legs, crane traveling organ, electric equipment, strong lifting winch, the frame adopts boxed-type welding mechanism, crane traveling mechanisms are operated in the driver cabin or remote control, Power is supplied by cable or slide wire. 
Safety feature:
Weight overload protection device, Top quality long time bearing polyurethane materials buffer, Crane traveling limit switch, Voltage lower protection function, Emergency stop system, current overload protection system and so on!
Control method: 
Pendent line with press button or remote control or cabin or both 
Design and construction rules: 
All the standards which is required for the crane is the Chinese standards.