Elastic tensioning device of flexible clamping belt of cabbage harvester

The utility model relates to a cabbage harvesting machine in agricultural machinery, in particular to an elastic tensioning device of a flexible clamping belt of a cabbage harvester, which comprises an elastic tensioning frame (1), an extension spring (6) and a tensioning wheel (10), the elastic tensioning frame (1) is a Y-shaped claw frame, the middle of the elastic tensioning frame (1) is movably supported on a rack (5) through a bearing by a pin shaft (3), and the elastic tensioning frame (1) can swing relative to the rack (5); a tensioning wheel (10) is supported on one corner of the Y-shaped elastic tensioning frame (1), the other corner of the Y-shaped elastic tensioning frame (1) is connected to the machine frame (6) through an extension spring (6), the elastic tensioning frame (1) elastically and dynamically swings along with the extension spring (6), and therefore the belt is elastically and dynamically tensioned through the tensioning wheel (10). The automatic tensioning device has the advantages th