A anchor clamps that is used for centre gripping major diameter hole work piece

The utility model provides an anchor clamps that is used for centre gripping major diameter hole work piece belongs to mechanical technical field. It has solved the problem that current anchor clamps can't carry out the centre gripping to large diameter work piece. This an anchor clamps that is used for centre gripping major diameter hole work piece, include and overlap with rising of the coaxial setting of lathe spindle is tight, locating in the tight cover that rises expand the head with locate in the tight cover that rises with expand the pull rod that the head linked firmly, the tight front end that overlaps that rises has the spreading lamella of a plurality of even settings, it is banding support piece all to articulate to have through hinge structure on every spreading lamella, support piece has the face of cylinder along the length direction extension of the tight cover that rises and support piece's the outside, be equipped with the regulation structure that makes support piece and spreading lamella keeping parallelism between spreading lamella and the support piece. The utility model has the advantages of low in production cost, centre gripping are effectual.