Quick change mechanism for large hole punch

The utility model discloses a large hole punch quick-changing mechanism which comprises an upper die and a lower die, and further comprises a guide mechanism arranged between an upper die base and a mounting base, one end of the guide mechanism is connected with the upper die base, and the other end of the guide mechanism is connected with the mounting base; a cylinder body of the pushing cylinder is connected with the upper die base, and a piston rod is arranged in the horizontal direction; the translation cushion block is connected with a piston rod of the pushing air cylinder, and the translation cushion block has a first state in which the translation cushion block is clamped by the upper die base and the mounting base and a second state in which the translation cushion block is separated from the upper die base and the mounting base; when the translation cushion block is in the second state, when the upper die base moves downwards, the pressure transmitted to the installation base through the guide mecha