Axle conveying line

The invention discloses an axle conveying line which comprises a main machine frame and a conveying mechanism installed on the main machine frame, the conveying mechanism comprises two synchronously-rotating conveying chains installed on the main machine frame, supporting guide rail sets are arranged on the main machine frame, and the number and the position of the supporting guide rail sets correspond to the number and the position of the conveying chains in a one-to-one mode. Each supporting guide rail set comprises an upper guide rail and a lower guide rail which are installed on the main machine frame in parallel in the vertical direction, each conveying chain comprises a plurality of rollers connected in sequence, every two adjacent rollers are connected through an inner chain plate and an outer chain plate, and the conveying chains are further provided with a plurality of supporting wheel sets. The supporting wheel sets are higher than the outer side faces of the conveying chains and used for being supp