Harvester threshing clutch device with pneumatic assistance

The utility model discloses a harvester threshing clutch device with pneumatic assistance. The device comprises a swing rod which is rotatably mounted on a rack and is connected with a tensioning wheel, the pneumatic power assisting device is installed on the rack and drives the tensioning wheel to press the transmission belt, a swing arm mechanism installed on the rack is connected between the pneumatic power assisting device and the tensioning wheel, and an adjusting device for adjusting the tensioning degree of the transmission belt is arranged on the swing arm mechanism; the air pressure power assisting device pushes the swing arm mechanism to rotate, the swing arm mechanism can drive the tensioning wheel to swing upwards gradually in the rotating process, the transmission belt is pressed tightly so that the transmission belt can make close contact with the belt wheel, and power combination is achieved. The labor-saving device is simple in structure and labor-saving in operation, the labor intensity of a