Roller conveying line structure

The utility model discloses a roller conveying line structure which comprises a machine frame and a plurality of rollers rotationally arranged on the machine frame along the same linear direction, and cantilevers are symmetrically arranged on the two sides of the machine frame. A plurality of first arc-shaped clamping seats are evenly distributed on the upper side of the cantilever in the length direction of the cantilever, and a plurality of first balls are arranged on the inner sides of the first arc-shaped clamping seats at intervals along the arc surfaces of the first arc-shaped clamping seats; the roller mounting assemblies correspond to the first arc-shaped clamping seats in number and comprise second arc-shaped clamping seats which are symmetrically arranged on the two sides of the first arc-shaped clamping seats and can move close to or away from the first arc-shaped clamping seats, and a plurality of second balls are arranged on the inner sides of the second arc-shaped clamping seats at intervals alo