Die heads for PPR pipe inner wire replacement and method for inner wire replacement through die heads

The invention discloses a method for replacing a PPR pipe inner wire through a wire taking die head and a wire pressing die head. The method comprises the steps that a, the wire taking die head is screwed into the PPR pipe inner wire, and the wire taking die head and the inner wire are matched; b, the wire pressing die head is fixed to one side of a heating plate of a hot melting device; c, the wire taking die head is fixed to the other side of the heating plate of the hot melting device; d, a to-be-replaced new inner wire is arranged on the wire pressing die head; e, the hot melting device iselectrified for 4-5 min; f, the hot melting device is slowly outwards pulled, and the heated old inner wire is moved out accordingly; g, the heating plate of the hot melting device is overturned by 180 degrees, and the wire pressing die head side faces a PPR pipe; h, the heated new inner wire on the wire pressing die head is aligned with the PPR pipe, force is exerted on the back face of the heating plate, the inner wire