大型凹底平车一般由凹底架、中底架、小底架及转向架等组成。凹底架由承载梁、端臂、心盘梁及心盘等组成。承载梁及心盘梁均由上下盖板、腹板及隔板组焊成箱形 ,端臂则由上下盖板、腹板及隔板组焊成双箱形。作为凹底平车主要承载部件的凹底架 ,其弯角部结构影响到凹底架的强度 Large concave flat car generally concave chassis, the chassis, small chassis and bogies and other components. Concave chassis by the bearing beam, arm, heart tray and heart plate and other components. The bearing beam and the heart plate beam are welded into the box shape by the upper and lower cover plates, the webs and the separator plates, and the end arms are welded into the double box shape by the upper and lower cover plates, the webs and the separator plates. As the main bearing concave concave flat car chassis, the corner of the structure of the angle of the concave chassis affect the strength