Elastic tensioning mechanism of belt conveyor

The utility model discloses a belt conveyor elastic tensioning mechanism which comprises a box body, two supporting frames are fixedly connected to the outer surface of the box body, transmission rollers are connected to the supporting frames in a rotating mode, a conveying belt is arranged outside the two transmission rollers in a sleeved mode, a lifting groove and a sliding groove which correspond to each other are formed in the inner wall of the box body, and the lifting groove and the sliding groove are matched with each other. A transverse rod is slidably connected into the lifting groove, one end of the transverse rod penetrates through the sliding groove and is slidably connected with the sliding groove, a first roller is rotatably connected to the transverse rod, and a roller groove corresponding to the first roller is formed in the bottom wall of the box body. Tensioning of the conveying belt is adjusted through lifting of the rotatable first idler wheel, the first idler wheel rotates along with the