Novel internal shielding railway digital signal cable and manufacturing method thereof
A digital signal cable and inner shielding technology, which is applied in cable/conductor manufacturing, twisted/quad twisted cables, circuits, etc., can solve problems such as interference
Inactive Publication Date: 2010-05-26
ZHONGTIAN RADIO FREQUENCY CABLE CO LTD
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Problems solved by technology
[0002] The current inner shielded railway digital signal cable core is composed of core wires of several wire groups, and there is at least one inner shielded quadruple wire group in the cable core. According to the electromagnetic field theory, it can be known that an alternating electromagnetic field will be generated around the wire pair, and Under the action of this electromagnetic field, other adjacent wire groups are used to generate induced currents. This is the mechanism of crosstalk coupling between cable wire groups. Therefore, in the process of information transmission, using the same pitch will cause serious problems. interference
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[0022] The present invention will be described in detail below in conjunction with the accompanying drawings and embodiments.
[0023] The present invention provides a Image 6 The inner shielded railway digital signal cable shown is composed of a cable core and an outer covering layer 2, the cable core is composed of core wires of several wire groups 1, and the outer covering layer 2 is an outer shielding layer 2-1, an inner sheath 2-2, steel tape armor layer 2-3 and outer sheath 2-4, its wire group 1 is composed of wire core, twisted group 1-2 such as image 3 , Star twisted four-wire group 1-3 such as Figure 4 and shielded star-quad 1-4 such as Figure 5 Composed, the shielded star-quad quadruple group 1-4, the outer copper shielding layer 1-4-1, the wire core is an insulated single wire 1-1 such as figure 2 , the shielded star-quad quads 1-4 may adopt the same pitch, and the shielded quads 1-4 and the unshielded quads may adopt the same pitch.
[0024] Its specific p...
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The invention relates to a novel internal shielding railway digital signal cable and a manufacturing method thereof. The manufacturing method comprises the following steps: (a) processing insulated single wires outside an oxygen-free copper conductor by the physical foaming three-layer co-extrusion technology; (b) stranding four insulated single wires of different colors at certain pitches into a spiral quad or two groups of multiple-twin quads, and wrapping the spiral quad or the multiple-twin quads with yarns or ribbons of different colors for distinguishing; (c) coating a copper shielding layer outside part of the spiral quad to form a spiral quad with a shielding layer; (d) stranding the spiral quad, the multiple-twin quads, the spiral quad with the shielding layer and the insulated single wires used as wire cores at certain pitches; and (e) sequentially coating an external shielding layer, an internal sheath, a steel-tape armouring layer and an external sheath outside a cable core. The manufacturing method of the invention can simplify the product structure, can greatly improve the production efficiency and can not lower the product quality. The experiment proves that all performance indexes of the product processed by the method fully meet and exceed the standard specifications.
Description
technical field [0001] The invention relates to a cable and a manufacturing method thereof, in particular to a novel inner-shielding railway digital signal cable and a manufacturing method thereof. Background technique [0002] The current inner shielded railway digital signal cable core is composed of core wires of several wire groups, and there is at least one inner shielded quadruple wire group in the cable core. According to the electromagnetic field theory, it can be known that an alternating electromagnetic field will be generated around the wire pair, and Under the action of this electromagnetic field, other adjacent wire groups are used to generate induced currents. This is the mechanism of crosstalk coupling between cable wire groups. Therefore, in the process of information transmission, using the same pitch will cause serious problems. interference. For this reason, in the production of cables, adjacent wire pairs adopt different pitches, and the coupling current...
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Login to View More IPC IPC(8): H01B11/04H01B11/06H01B13/00H01B13/04
Inventor 蓝燕锐徐友胜
Owner ZHONGTIAN RADIO FREQUENCY CABLE CO LTD