The invention relates to a lower automatic-tension hopper lifter, wherein, main drive wheel of lifter is mounted in the upper chamber to be rotated by using motor via the reducer; the driven wheel of lifter is via the bearing base mounted on two sides of lower chamber inside the lower chamber, with a adjuster for moving the bearing base up-and-down; two pipes on the upper part of lower chamber are individually matched with the lifting pipe and backhaul pipe on the base; the lower chamber is mounted inside the base to move up-and-down; the center of the upper part of lower chamber has a compression spring, via compression plate, dual-head bolt, cushion ring and nut, connecting two sides of base to supply tension force; the feeding hopper is mounted on the base to connect the feeding inlet of lower chamber. The invention has tight structure, easy installment, lower cost and reliable property. |