Die head device capable of exchanging 8mm copper rod cold welding equipment

The utility model discloses a die head device capable of exchanging 8mm copper rod cold welding equipment, relates to the technical field of copper rod cold welding, and solves the technical problem that the service life is affected due to the fact that a die head is easy to damage when the die head carries out direct compression joint or gasket compression joint on a non-8mm copper rod. Comprising two first die head bodies which are symmetrically arranged up and down and two second die head bodies which are symmetrically arranged up and down, disassembly and assembly grooves are formed in the opposite sides of the two first die head bodies and the two second die head bodies correspondingly, and die nozzles used for clamping a copper rod are arranged in the disassembly and assembly grooves; a convex dovetail-shaped son dovetail is mounted on one side, close to the dismounting groove, of the die nozzle; and a mother groove matched with the son dovetail is formed in the bottom of the dismounting groove. The die