Core pulling structure

The invention relates to the technical field of injection molds, in particular to a core pulling structure which comprises a bottom plate, a first sliding assembly, a second sliding assembly, a driving part and a retreating limiting assembly. The first sliding assembly comprises a first sliding block and a core pulling block. The second sliding assembly comprises a second sliding block, a fixed block and a movable insert, the second sliding block is arranged on the bottom plate in a sliding mode in the first direction, and the fixed block is fixed to the second sliding block. And the core-pulling block drives the movable insert to move, so that the movable insert and the product back-off design position are firstly demolded. After the first sliding block moves for a certain distance, the limiting piece is gradually changed from the state of stretching out of the pressing plate to the state of retracting into the pressing plate so as to relieve the limiting effect of the limiting piece on the check block, so t