Jetting-moulding screw of plastic jetting-moulding machine

Abstract

The invention relates to an injection screw of an injection machine which has the functions of preventing a material from refluxing and stopping reverse and consists of a screw head, a check ring, a thrust ring and a screw body. The novel check ring with an inner flange and a clamping head, the screw head with a radial cutting groove and the thrust ring with a step surface realize excellent seal performance and eliminate the leakage problem caused by nonmelt grains, contaminations or other impurities by the slide closure between the inner flange of the check ring and the cylinder of the screw head as well as between the inner annular surface of the check ring and the step surface of the trust ring. In injection, the area of the larger end surface of the check ring ensures the realization of fast starting and shortens the closing time of the check ring. The fused masses are promoted to be further mixed when the radical cutting groove of the screw head is plasticized; in injection, the refluxing of the fused masses can be buffered; the leakage amount of the fussed massed can be reduced and the measuring precision is improved.

Description

technical field [0001] The invention relates to a screw rod of a plastic injection molding machine, in particular to an injection molding screw rod capable of preventing material backflow and anti-reverse function. Background technique [0002] Injection screw is one of the key parts of injection molding machine. It rotates in the barrel of the injection molding machine. Its main function is to melt and plasticize solid plastic particles or plastic powder, store and measure, and then inject a certain amount of molten plastic into the mold. After the mold is cooled, it is ejected to obtain plastic. products. [0003] Screw with ring check screw head in injection molding screw (such as figure 1 shown) consists of the following parts: screw head 1, check ring 2, thrust ring 3 and screw body 4. The non-return ring is located between the conical screw head and the thrust ring, and is wrapped on the circular cylinder of the screw head; the screw head is connected to the screw b...

AI Technical Summary

Problems solved by technology

The wear between the screw head and the non-return ring will increase the closing distance of the non-return ring, which will increase the closing time and increase the occurrence of backflow; the wear between the outer diameter of the non-return ring and the inner diameter of the barrel will increase the The gap between the ring and the barrel is conducive to the rapid movement of the non-reverse ring, but at the same time increases the occurrence of leakage, which affects the stability of the weight of the injection molded product and the sealing effect

[0006] The annular non-return screw head also has problems such as serious leakage caused by non-alignment, particle contamination, and poor contact of the contact surface due to the presence of unmelted particles.

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