Belt conveyor tail spiral tensioning device

The utility model discloses a belt conveyor tail spiral tensioning device which comprises a fixing frame, a sliding way plate, a sliding way, a baffle, a sliding block, a roller inserting hole, a threaded hole and a screw rod. The other end of the screw is assembled in a threaded hole formed in the baffle at the other end of the fixing frame in a threaded mode and then extends to the outer side of the baffle, and a limiting clamping plate is fixed to the outer side of the baffle at the other end of the fixing frame and used for limiting movement of the screw in the length direction of the fixing frame. Compared with the prior art, the screw rod is adopted to drive the sliding block, namely the spiral motion of the screw rod is converted into the linear motion of the sliding block so as to adjust the tensioning of the belt by the tail roller of the belt conveyor, and the stroke of the sliding block in the slideway is long, so that the adjusting range of the tail roller of the belt conveyor is large; due to the