The injection molding work is completed by the thrust action on the thrust shaft of the screw, and the thrust action on the nozzle is completed by the thrust action on the screw.

The device can realize the forward and backward action of the injection seat when the moving cylinder is fed, and ensure that the injection nozzle of the domestic injection molding machine brand is in close contact with the circular surface of the main pouring sleeve of the mold, so as to generate the pressure of the injection seat that can seal the melt.

The accuracy of injection parts requires that after assembly, the whole injection parts should be placed on the rack, to ensure that the injection mouth and the main pouring sleeve of the mold are closely engaged to prevent overflow, and the center line of the injection parts is required to be parallel to the center line of the closing parts; In order to ensure the accuracy of the injection screw and the inner hole of the barrel, it is necessary to ensure that the two injection cylinder holes are parallel to the center hole of the barrel and symmetrical with the center line;

For the horizontal machine, the parallelism of the guide hole of the two mixed two-color injection molding machine and the symmetry of the center line must also be ensured, and the symmetry between the center line and the center line of the hole of the two-seat oil shifting cylinder must be ensured for the vertical head. The factors that affect the positioning accuracy are the dimensional accuracy, geometric accuracy, manufacturing accuracy and assembly accuracy of the hole and shaft of the associated parts.