Roller type sliding rail mechanism of commercial vehicle middle-mounted battery system

The invention discloses a roller type slide rail mechanism of a commercial vehicle central battery system, which comprises a guide piece, two support pieces and a plurality of rail transverse plates, the guide piece is located between the two support pieces, the guide piece and the two support pieces are arranged in parallel, and the plurality of rail transverse plates are jointly fixed on the lower sides of the guide piece and the two support pieces; the cooperation of the guide piece and the guide rod provides a guide effect for battery replacement of the battery system and ensures smooth butt joint of a quick-change plug-in unit in front of the battery system, so that middle-mounted battery replacement and contact and cooperation of the smooth rod and the universal ball of the supporting piece are realized, the universal ball can support the weight of a battery pack, and meanwhile, in the moving process of a battery box, the battery pack can be conveniently and rapidly replaced. The universal ball can redu