Leaky coaxial cable of dual-steel wire enhanced internal conductor and its making method
A technology of inner conductor and steel wire, which is applied in the manufacture of coaxial cables, coaxial cables/analog cables, etc. It can solve problems such as low tensile strength, fluctuation of coupling loss, and deterioration of leakage coaxial characteristics, and achieve stable and reliable coupling performance , The effect of increasing the tensile strength and reducing the amount of copper used
Inactive Publication Date: 2007-07-11
BEIJING JIAOTONG UNIV
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Problems solved by technology
One is metal copper tubes, which need to consume hundreds of kilograms of high-purity electrolytic copper. Due to the increasingly scarce copper resources, the price of copper has increased several times in the past two years, so the inner conductor made of copper tubes is expensive and must be improved.
Another kind of inner conductor is composed of copper-clad aluminum wire. Its tensile strength is low, and it is easy to stretch and deform during construction, which makes the characteristics of the entire leaky coaxial line worse. The leaky coaxial line with the above two inner conductors is in the It is easy to reverse during the construction process, so that the radiation trough of the leaky coaxial line is not in a straight line, causing large fluctuations in the coupling loss between the leaky coaxial line and the locomotive antenna, and greatly increasing the bit error rate of the vehicle-ground communication
In addition, neither of these two kinds of leaky coaxes can be made into a comprehensive optical cable containing optical fiber bundles, and it is impossible to make optical fiber transmission and leaky cable radiation transmission organically form a highly stable vehicle-to-ground communication system
Method used
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[0018] 1 In the process of extruding the empty plastic tube (1), two reinforcing steel wires (2) need to be added in parallel, and the extruded empty tube contains the reinforcing steel wires in the tube wall to form a mechanical support for the inner conductor (3). Among them, the two steel wires should be on the same plane as the center line of the plastic empty pipe. As shown in Figure 1.
[0019] 2. Put the mechanical support body (3) of the above-mentioned inner conductor into the copper foil longitudinal wrapping machine, and the width of the copper-plastic composite tape (4) with a longitudinal thickness of about 0.05mm is 3-5mm longer than the circumference of the plastic outer tube. After the longitudinal cladding is formed, heating air is required to bond the lapped parts of the longitudinal clad copper foil composite tape into a whole to form a plastic tube of the longitudinal clad copper foil composite tape, which is used as a leaky coaxial inner conductor (5) of a...
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This invention relates to one leakage axis with double steel wire conductor and its process method, wherein, the conductor uses plastic tube with steel wires as mechanic supporter; the steel wires and the tube center lines are in same plane to ensure not to generate torque in the pavement process; the inner conductor presses physical bubble insulation layer; the layer is banded with each circle eradion tank copper band to form leakage axis outer conductor covered by outer plastic cover.
Description
technical field [0001] The invention relates to the technical field of rail transit vehicle-ground communication. Specifically, it is a leaky coaxial with double steel wire reinforced inner conductor and its manufacturing method, which is applied in high-speed railway vehicle-to-ground communication. Background technique [0002] At present, there are two kinds of inner conductors of leaky coaxial cables used in rail transit vehicle-to-ground communication. One is metal copper tubes, which need to consume hundreds of kilograms of high-purity electrolytic copper. Due to the increasing scarcity of copper resources, the price of copper has increased several times in the past two years, so the inner conductor made of copper tubes is expensive and must be improved. Another kind of inner conductor is composed of copper-clad aluminum wire. Its tensile strength is low, and it is easy to stretch and deform during construction, which makes the characteristics of the entire leaky coax...
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Login to View More IPC IPC(8): H01B11/18H01B13/016
Inventor 简伟卫延方宏苏晓星王琳
Owner BEIJING JIAOTONG UNIV