Fast clamping mechanism

The utility model discloses a fast clamping mechanism with simple structure. The utility model comprises a fixed semicircular ring and a movable semicircular ring which match with each other, wherein the inner walls of the fixed semicircular ring and the movable semicircular ring are respectively provided with inclined wedge surfaces matched with the connection mouth bevel faces of an extruder and a granulator; one end of the movable semicircular ring is movably hinged with one end of the fixed semicircular ring, and the other end of the movable semicircular ring is provided with a switching spanner which enables the fixed semicircular ring and the movable semicircular ring to be mutually matched or separated; the other end of the fixed semicircular ring is provided with a clamping block which matches with the switching spanner. Compared with the prior art, the utility model has the advantages of safety, reliability, high connecting or separating speed and long service life, and does not need to be replaced frequently, so the utility model has great practical value in the connection of the extruder and the granulator.