Rubber continuous vulcanization unit extruder screw

Abstract

The invention discloses a rubber continuous vulcanization unit extruder screw. The screw comprises a screw head and a screw column, and the screw column and the screw head are of an integrated structure; the screw column is provided with an uninterrupted screw edge, and the length-diameter ratio of the screw is 16:1; the whole screw column is provided with a double thread which is equal in interval and unequal in depth, and the depth of the thread is gradually decreased from a feeding inlet to the end of the thread; and the volume ratio of a first thread groove in the feeding section of the screw to a last thread groove of the screw is 1.56. During normal production, the actual outlet speed is improved by 30% compared with a previous mode, on the premise that an applied rubber material isnot changed, that is, on the premise that the formula of the rubber material is not changed, over-vulcanization of the extruded rubber material is avoided, the production requirements are met, and thelabor productivity is improved.

Description

technical field [0001] The invention relates to the technical field of cable screws, in particular to an extruder screw of a rubber continuous sulfur unit. Background technique [0002] Extruder (including extrusion molding and rubber extrusion) is the most basic equipment for wire and cable insulation and sheath processing. The functional characteristics of the extruder determine its important position in the cable processing equipment. The extruder is composed of many parts. An excellent extruder, the quality of each part is not only excellent, but also can coordinate well with each other. The screw of the extruder is one of the most important components that determine the quality of the equipment. [0003] The original screw is a mixed screw with primary and secondary threads, and we have carried out a detailed analysis of its type. The ratio of length to diameter of the original screw is 16:1, and can be divided into feeding section, mixing section and extruding sectio...

AI Technical Summary

Problems solved by technology

It is also found through measurement that the distance between the three reinforced flight sections of the screw is relatively short, and the cooling area is not large, so the heat generated by shearing is not easy to export, the frictional heat is too large, and the material temperature rises too much during the extrusion process of the rubber material. fast (sometimes up to 140°C), the load on the extruder also increases significantly

It can be considered that for high-viscosity rubber, the mixing effect is not very good, and the ideal state of mixing cannot be achieved, especially for such a large extruder and in the production of large cross-section cables, the problem is more serious, resulting in extrusion The rubber compound is not uniform due to insufficient mixing, and at the same time, it will also cause unstable shrinkage of the thickness and cross-section of the rubber compound, and uneven vulcanization effect

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