U-shaped dumper and carriage chassis thereof

The utility model provides a U-shaped dumper carriage chassis. The U-shaped dumper carriage chassis comprises a carriage chassis body, two parallel main longitudinal beams, a plurality of cross beams, a first through cross beam, a second through cross beam, two segmented longitudinal beams and two pieces of turnover seat welding iron. The two main longitudinal beams are arranged on the carriage chassis in parallel, and the cross beams are connected between the two main longitudinal beams; the rear ends of the two main longitudinal beams are connected with segmented longitudinal beams respectively, the first through cross beam and the second through cross beam are installed on the segmented longitudinal beams in parallel in a crossing mode, the overturning seat welding iron is installed on the first through cross beam and the second through cross beam in a crossing mode in the longitudinal direction, and the two overturning seat welding iron are parallel to each other. And the two turnover seat welding irons a