Ultralow flat car for sanding large power transformer oil tank

The utility model relates to an ultralow flat car for sanding a large power transformer oil tank, belonging to the technical field of special transport equipment for ensuring ultra-large and ultrahigh oil tanks to enter into the sanding, paint spraying and drying procedures. The ultralow flat car is characterized in that the ultralow flat car comprises a car body (2), wheel trains (3) and rigid cross beams (1); the rigid cross beams are connected with the car body and the wheel trains; the wheel trains and the rigid cross beams are welded together; and the rigid cross beams are welded on the under car body. The ultralow flat car has the following beneficial effects: without changing the plant equipment, the height of the flat car is furthest reduced; the load surface of the car body is 250mm away from the track surface and the lower surface is 46mm away from the track plane; and the ultralow flat car almost runs close to the ground, the support height is reduced and the rigidity and carrying tonnage of the fr