Injection unit for injection molding machine

Abstract

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.

Description

technical field [0001] The invention relates to an injection molding machine, in particular to an injection molding device used in the injection molding machine with stable melt glue and high process control linearity. Background technique [0002] There is an existing Chinese utility model patent with the patent number CN201220207208.7 titled "Injection Molding Mechanism of High-Performance Single-Cylinder Injection Molding Machine", which discloses an injection molding mechanism of an injection molding machine, specifically a high-performance single-cylinder injection molding machine. The injection molding mechanism includes a base, a screw mounted on the base, and an injection cylinder device installed on the rear side of the screw. The rear end of the screw is fixedly connected to a coupling driven by a cycloidal oil motor. The differential injection drives the cycloid oil motor and the coupling for high-speed horizontal linear motion. The invention directly connects th...

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Problems solved by technology

However, during the melt extrusion process of this mechanism, the screw has rotational inertia and cannot be stopped suddenly. Whether the extrusion is random or not is difficult to achieve precise control. At the same time, the extrusion of the melt will be affected by factors such as temperature and pressure when it moves axially The stability and linearity make the extrusion effect unsatisfactory, so the structure of the device needs to be further improved

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