Monotonic key groove hopper extension sliding rail

The utility model discloses a monotonic key groove hopper extension sliding rail, relates to a hopper extension sliding rail mechanism for a vertical mine slagging-off loader, and mainly solves the problem that the conventional hopper extension sliding rail mechanism for the vertical mine slagging-off loader has low loading capacity, short service life and low mechanical property because a sliding groove is matched with a pulley. The monotonic key groove hopper extension sliding rail consists of a fixed block with a sliding block and a fixed block with a sliding groove, wherein the two fixed blocks are arranged on the same plane; and the sliding block on the fixed block is arranged in the sliding groove on the other fixed block in a clearance fit mode. During use, the fixed block with the sliding block is fixed on a lifting hopper bottom plate, and the fixed block with the sliding groove is fixed on a lifting driving mechanism through a balance frame. By matching the sliding groove with the sliding block, the