The utility model relates to a gnaw rail device, overhead traveling crane, belong to a bridge crane technical field, concretely relates to rail gnawing prevention device, hanging beam overhead traveling crane that is used for the hanging beam overhead traveling crane. Include: connect the crossbeam, the hinged -support of platform truck is connected at its both ends, the center hinge, its one end fixed connection central beam, the other end stretch into in the connecting hole at frame end beam middle part. Move the equilibrium of platform truck atress from north to south and adapt to the deformation of frame bridge crane horn side sway for guaranteeing, adopt central hinge in the middle part of the overhead traveling crane frame end beam and move the platform truck from north to south and be connected, on the direct support of frame girder tip moves the platform truck from north to south. The rail can automatic adjustment adaptation be gnawed to this rail gnawing prevention device, and the long -time rail of gnawing is avoided to side direction effort between automatically released wheel and the track.