Elevator car frame with lower beam provided with reinforcing rib structure

The utility model belongs to the field of elevators, and particularly relates to an elevator car frame with a reinforcing rib structure on a lower beam, which comprises a left straight beam, a right straight beam, an upper beam mounted between the upper ends of the two straight beams in a matched manner and a lower beam mounted between the lower ends of the two straight beams in a matched manner, the lower beam comprises a lower beam upper transverse portion, a lower beam middle portion and a lower beam lower transverse portion which are sequentially connected from top to bottom and form an I-shaped structure, beam grooves are formed in the front side and the rear side of the lower beam respectively, a plurality of reinforcing ribs are arranged in each beam groove, and two reinforcing ribs are located at the ends of the lower beam. The two reinforcing ribs and the corresponding straight beams are installed in a matched mode through fasteners. The lower beam is designed to be of the I-shaped structure, the rei