Bolt special for internally and externally shielded cable material

Abstract

The invention discloses a bolt special for an internally and externally shielded cable material, comprising a feeding section and a compression section as well as a homogenization section arranged at the front end of the bolt. A threaded section for preventing materials from refluxing is also arranged at the end part of the feeding section, the bolt diameter of the compression section is gradually increased along the axial direction of the bolt, the bolt groove depth of the compression section is gradually reduced along the axial direction of the bolt, the bolt diameter of the feeding sectionis smaller than that of the homogenization section, the feeding section, the compression section and the homogenization section have identical thread pitch, the bolt length of the homogenization section is smaller than that of of the compression section, and the bolt length of the compression section is smaller than that of the feeding section. The bolt special for the internally and externally shielded cable material ensures that the internally and externally shielded cable material is fully, tightly and evenly compressed during the conveying and ensures the product quality; and the bolt diameter of the homogenization section is larger than that of the feeding section so that the internally and externally shielded cable material is stably fed, the homogenization section outputs in balance, the melting and extruding speeds are increased, and the production efficiency of enterprises are increased.

Description

technical field [0001] The invention relates to a screw structure, in particular to a special screw structure for an extruder used for inner and outer shielding cable materials. Background technique [0002] The screw of the extruder is an important part of the extruder. It is made of high-strength and corrosion-resistant alloy steel. Through its rotation, the plastic in the barrel can move, get pressurized and part of the heat (friction heat) . The application range and productivity of the extruder directly depend on the temperature uniformity of the melt extruded by the machine and the stability of the pressure and extrusion volume, and these parameters directly depend on the structural characteristics of the screw. [0003] The geometric parameters of the screw, such as diameter, length-to-diameter ratio, length ratio of each segment and depth of the screw groove, etc., have a significant impact on the working characteristics of the screw. The existing screw can be divi...

AI Technical Summary

Problems solved by technology

[0004] However, when the screw with the above structure is used in the extruder to transport the inner and outer shielded cable materials, due to the equal diameter of the screw at the compression end, the molten outer shielded cable material is mixed unevenly, the compression is not compact, and the feeding is unstable. The output is unbalanced, which reduces the quality of the melt, and also slows down the rate of melting and conveying, which affects the production efficiency of the enterprise. In addition, at the same time, the connection between the threaded end and the barrel is prone to material backflow, and its sealing performance is poor.

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