Discharge device of injection moulding machine in two-stage type

Abstract

The present invention relates to a material discharge device of two-stage type injection-moulding machine. Said material discharge device includes the following several portions: non-return shaft seat with flow passage, it is placed between material-feeding portion and injection portion of said two-stage type injection-moulding machine for making the plastics in the material-feeding portion be fed into said injection portion by means of said flow passage; at least a non-return shaft placed in the non-return shaft seat, it can be used for closing flow passage and stopping plastics supply according to requirements; at least a cover plate set on one side of said non-return shaft seat, on said cover plate at least one material discharge hole is cut, said material discharge hole can be used for discharging out residual plastics between said non-return shaft seat and non-return shaft; and an adjustable unit for regulating discharging speed of said residual plastics.

Description

technical field [0001] The invention relates to a discharge device of a two-stage injection molding machine, in particular to a discharge device for discharging residual plastics of the two-stage injection molding machine. Background technique [0002] As the precision and quality requirements of injection molding continue to improve, the use of two-stage injection molding machines is becoming more and more widespread. This is due to the fact that the two-stage injection molding machine is as Figure 5 As shown, it includes a feeding part 50 and an injection part 55, and the metering and non-return function of the feeding part 50 can be used to exert the effect of precise metering, thereby improving the quality of injection molding. [0003] The injection action of the two-stage injection molding machine is based on Figure 5 The shown motor 56 drives the metering screw 57 to rotate, so that the plastic in the hopper 58 enters the material pipe 59 for mixing and melting, and...

AI Technical Summary

Problems solved by technology

[0005] However, for this type of two-stage injection molding machine, when it is actually running, due to the relative movement between the non-return shafts 61, 71 and the non-return shaft seats 60, 70, the matching clearance is also likely to cause melting. Glue overflow and leakage

In order to solve this problem in the prior art, the gap between the non-return shafts 61, 71 and the non-return shaft seats 60, 70 is designed to be reduced (the tolerance is reduced), or other leak-proof devices are added to prevent overflow; And during the measurement process, the high-pressure melt glue easily penetrates into the gap, so if the gap is too small, it may cause the non-reverse shafts 61 and 71 to be stuck and unable to rotate; moreover, for plastics with added fibers or powders, when these materials When it penetrates into the gap and cannot be discharged, it will be charred and cracked due to excessive heating. If it is mixed into the melt at this time, it will seriously pollute the quality of the finished product (especially the transparent injection product).

[0006] Therefore, how to invent a new type of discharge device that can be used in two-stage injection machines to solve the problems of non-reverse shaft stuck and deteriorated plastics polluting finished products has indeed become an urgent subject to be solved in related research and development fields.

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