Manufacturing process of railway signal cables

Abstract

The invention discloses a manufacturing process of a railway signal cable. The cable comprises a cable core, a cable core tape layer, an aluminum sheath layer covering the cable core tape layer, and an outer sheath layer. The aluminum sheath The material of the sheath layer is an electrical pure aluminum strip, and the aluminum sheath layer is welded by a welding torch, and the gas channel of the welding torch is provided with a mixed gas composed of helium and argon as a welding shielding gas; the thickness of the aluminum sheath layer is The relationship between the mixing ratio of helium and argon is as follows: when the thickness of the aluminum sheath layer is 1.0~1.2mm, 1.3~1.5mm, 1.6~2.0mm, the mixing ratio of helium / argon is 1:5.0~1 : 3.5, 1: 3.5 ~ 1: 2.0, 1: 2.5 ~ 1: 1.7. The invention manufactures the cable with welding seam, which has good welding quality, high welding seam compactness, small deformation of welding parts, small area of ​​aluminum sheath surface affected by welding arc light heat, and fast welding speed.

Description

Technical field [0001] The invention relates to the field of railway signal cables, in particular to a manufacturing process of railway signal cables. Background technique [0002] In order to improve the shielding ability of the cable against external electric field interference, the aluminum sheath structure layer is set in the sheath structure of most communication cables and railway signal cables. Its main function is to shield the cable core from the electric field. Improve the ability of the cable to resist external electric field interference, thereby improving the transmission stability of the cable. (The typical structure of the aluminum sheathed railway signal cable is detailed in the attachment figure 1 ). [0003] In the actual production process of the cable, the common production process is to use the argon arc welding technology: that is, the electrical pure aluminum strip, which is the raw material of the cable aluminum sheath, is formed after continuous processing...

AI Technical Summary

Problems solved by technology

[0007] Therefore, during the continuous welding operation of the aluminum sheath of the cable, the selection of the shielding gas, the flow rate, and the size of the welding current will affect the air tightness of the aluminum sheath and the mechanical strength of the weld, thereby affecting the aluminum sheath. The welding quality of the sleeve

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