Tail pipe plug assembly for drilling liner cementing

The utility model relates to a plug assembly technical field is a tail pipe plug assembly for drilling liner cementing, it includes short circuit head, sliding sleeve, pawl cover and plug dabber, being fixed with the ring platform in the inboard an organic whole in the middle part of short circuit head, being equipped with at least one arc annular groove in the upper portion inboard of ring platform, be fixed with the pawl at the upper end equipartition of pawl cover, an organic whole is fixed with the flange in the upper end outside of pawl, and the flange on the pawl clamps in arc annular groove, and the lower part suit of short circuit head is sheathe in at the pawl, the lower part of sliding sleeve and the middle part of pawl cover through at least one shearing pin nail fixed connection together. The utility model has the advantages of reasonable and compact structure, convenient to use uses through the cooperation of short circuit head, sliding sleeve, pawl cover and plug dabber,realizes going on smoothl