Chain type conveying tensioning device

The utility model discloses a chain type conveying tensioning device, which belongs to the technical field of chain type conveying and comprises a tensioning box fixed at the bottom of a conveying device, movable tensioning wheels are arranged on two sides of the inner wall of the tensioning box, a same rotating roller is rotatably connected between the bottoms of the inner walls of two ends of the tensioning box through bearings, and the rotating roller is provided with a rotating shaft. The two sides of the inner wall of the tensioning box are each provided with a connecting frame of a U-shaped structure. The rotating disc is held by a hand, at the moment, the threaded rod rotates in the inner wall of the threaded hole so that the connecting frame can move, the sliding block can slide in the inner wall of the sliding groove, the distance between the two tensioning wheels can be changed, and tensioning operation can be conducted; on the premise of ensuring that the conveying chain is in a tensioning state an