The invention discloses an injection molding device for an
injection molding machine. A plasticizing part (M) and an injection part (N) are of separated structures; the injection part (N) comprises an injection cylinder body (1), an injection
pipe (2) and an injection
piston (3); the injection
piston (3) is arranged in an inner cavity (11) of the injection cylinder body (1), and is connected with a driving part through a connecting rod; the injection
pipe (2) is arranged on the front part of the injection cylinder body (1), and a material
discharge channel (21) in the injection
pipe (2) is communicated with the inner cavity (11) of the injection cylinder body (1); and the inner cavity (11) of the injection cylinder body (1) is communicated with a material
discharge hole (41) of the plasticizing part (M) through a through hole (12). The injection molding device for the
injection molding machine has the advantages that three parameters of a melt glue screw cannot be affected by axial moving, the melt glue
pressure curve is stable, stable material discharging can be achieved, the phenomena of material feed quantity fluctuation and empty material discharging can be avoided, and meanwhile the
linear relation of yield and speed can be achieved; and in addition, axis positions of the melt glue screw and a
machine barrel can be fixed, the
heating efficiency and the stability of the outer part of the
machine barrel can be ensured, and the variability and lagged effects of
temperature measurement and heating can be furthest reduced.