Straw pulling chain tensioning mechanism of corn harvester

The utility model relates to the field of chain tensioning, in particular to a seedling pulling chain tensioning mechanism of a corn harvester. The corn harvester standing grain pulling chain tensioning structure can change the effective working width of the two sides of the standing grain pulling chain, and tensioning is more flexible. Main function implementation parts of the device comprise an outer shell, a chain wheel structure and a tensioning structure, the chain wheel structure and the tensioning structure are both arranged in the outer shell, the chain wheel structure is fixedly connected with the outer shell, the tensioning structure is in sliding connection with the outer shell, the tensioning structure is arranged on the chain wheel structure, and the tensioning structure is in sliding connection with the chain wheel structure. The outer shell of the device mainly plays a role in fixing and supporting the chain wheel structure and the tensioning structure, meanwhile, the moving track of the seedli