WO2016078428A1

WO2016078428A1 - Optical cable-embedded composite leaky coaxial cable and manufacturing method thereof

Info

Publication number: WO2016078428A1
Application number: PCT/CN2015/083432
Authority: WO
Inventors: 潘艺新; 许波华; 蓝燕锐; 赵瑞静; 黄德兵
Original assignee: 中天日立射频电缆有限公司
Priority date: 2014-11-18
Filing date: 2015-07-07
Publication date: 2016-05-26
Also published as: CN104362418B; CN104362418A

Abstract

An optical cable-embedded composite leaky coaxial cable comprises an optical cable (1), a corrugated copper tube (2), a polyethylene foaming insulation layer (3), a slotted copper strip (4) and a polyolefin outer sheath (5); the corrugated copper tube (2) is internally coated with the optical cable (1), the polyethylene foaming insulation layer (3) is extruded outside of the corrugated copper tube (2), the polyethylene foaming insulation layer (3) is externally coated with a layer of slotted copper strip (4), and the polyethylene foaming insulation layer (5) is extruded outside of the slotted copper strip (4). With an optical cable embedded therein, the optical cable-embedded composite leaky coaxial cable is reasonably combined to form a composite structure, which ensures that the cable not only has the electrical performances of the leaky coaxial cable, but is also additionally imparted with the electrical performances of the optical cable; therefore, the cable is a multifunctional new product.

Description

Embedded optical cable composite leakage coaxial cable and manufacturing method thereof

Technical field

The invention relates to an embedded optical cable composite leakage coaxial cable and a manufacturing method thereof, which not only retains all the performance advantages of the leaky coaxial cable, but also increases the optical cable compared to a single leaky coaxial cable product. Performance advantage. At the same time, the optical cable is embedded in the design, and the optical cable has a relatively stable external environment in the process of transmitting optical signals, which reduces the influence of uncertainties in the external environment. Effectively ensure reliable and stable transmission of optical signal information. In the closed environment, the leaky coaxial cable can fully utilize the performance advantages of the optical cable, effectively change the environment of the inner conductor, increase the transmission rate, and reduce the attenuation. Therefore, the invention relates to an in-line cable composite leaky coaxial cable.

Background technique

The conventional leaky coaxial cable can basically satisfy the effective propagation of signals such as mountains, hills, tunnels, underground railways, mines, underground buildings, shopping malls or other electromagnetic fields to provide a sufficiently large electromagnetic field. However, in some public places, it is necessary to leak a coaxial cable to provide communication in an electromagnetic field environment, and an optical cable is required to transmit the optical signal. In an environment like a shopping mall, the space for housing cables is very limited, and it is not suitable for installing leaky coaxial cables and cables at the same time. In order to solve this problem, an in-line cable-type leaky coaxial cable was developed to meet the diverse needs of the market.

Summary of the invention

The object of the present invention is to provide an embedded optical cable composite leakage coaxial cable and a manufacturing method thereof for the above-mentioned deficiencies, and to integrate the optical cable composite leakage of the present invention in order to realize the diversified demand for electromagnetic field propagation electrical signals and optical signals to be simultaneously propagated. The coaxial cable is properly combined by the embedded optical cable to form a composite structure, which ensures that the cable has both the electrical performance of the leaky coaxial cable and the electrical performance of the optical cable, and is a multifunctional new product. .

The embedded optical cable composite leakage coaxial cable of the invention and the manufacturing method thereof are realized by the following technical solutions:

The embedded optical cable composite leakage coaxial cable comprises an optical cable, a braided copper tube, a polyethylene foamed insulation layer, a slotted copper strip and a polyolefin outer sheath; the optical cable is wrapped in the braided copper tube, and the braided copper tube is wrapped The outer layer is extruded with a polyethylene foamed insulation layer, and a layer of slotted copper strip is wrapped on the outside of the polyethylene foamed insulation layer, and a polyolefin outer sheath is extruded on the outside of the slotted copper strip.

The optical cable comprises a central reinforcing core, an optical fiber unit, a plastic coated aluminum tube and a polyethylene outer sheath; a single optical fiber unit is surrounded around the central reinforcing core, and a plastic coated aluminum tube is wrapped on the outer side of the optical fiber unit. The outer surface of the plastic aluminum tube is extruded with a polyethylene outer sheath. A reinforcing core is arranged in the center of the cable to facilitate the wrapping of the single-core cable while increasing the strength of the cable and the leaky coaxial cable.

The steps of the method for manufacturing the embedded optical cable composite leakage coaxial cable are as follows

1. The fiber optic cable can be composed of a single fiber unit or a plurality of fiber units according to the needs of the customer. A single fiber unit is surrounded around the center reinforcing core, and a plastic coated aluminum tube is wrapped on the outside of the fiber unit. The outer surface of the aluminum tube is extruded with a polyethylene outer sheath, and the outer diameter of the optical cable is required to be smaller than the inner diameter of the braided copper tube.

2. After the copper strip is trimmed by the copper strip, it is bent into a circular shape through the U-shaped groove, the optical cable is wrapped inside, and it is welded into a closed copper tube by argon arc welding gas welding. The eccentric weaving method makes the smooth copper tube into a spiral-shaped copper tube, and the weld seam is not required to have a problem of virtual welding. The thickness of the copper strip should conform to the standard; the peaks, troughs and pitch of the zigzag formation should be within strict control requirements.

3. After the production of the braided copper tube is completed, the extruded polyethylene foam insulation layer is continued in the physical foaming production line. First, the endothelium material is squeezed on the outside of the braided copper tube. The endothelium material is made of low-density polyethylene. The temperature of the endothelial extruder is controlled at 140 ° C ~ 200 ° C, and the surface is directly extruded to the outside of the braided copper tube. An endothelial layer is formed; then a polyethylene foamed insulation layer is extruded outside the endothelial layer. The polyethylene foam insulation material is a mixture of low density polyethylene, high density polyethylene and nucleating agent, and the weight ratio of low density polyethylene, high density polyethylene and nucleating agent is 74:25:1; The material of the nucleating agent is a polyethylene material. The mixture is injected with nitrogen or carbon dioxide gas at a high pressure in a molten state at 130 ° C to 200 ° C. Under the action of rotation and shear of the screw, the molten plastic and the gas are thoroughly mixed, and the molten polyethylene mixture and the gas are mixed and nucleated, and the foaming mixture is passed. The extrusion head is uniformly and stably extruded, coated on the outside of the above-mentioned braided copper tube extruded with the endothelial layer to form a polyethylene foamed insulation layer, and the temperature of the extruder is controlled at 130 ° C to 200 ° C. After the temperature of the hot water bath is cooled (35 ° C ~ 40 ° C), it is cooled by a cold water tank (20 ° C ~ 30 ° C), dried, and finally wound on the disc. It is required that no cell can be formed between the inner layer and the polyethylene foam insulating layer, and the outer surface of the polyethylene foamed insulating layer is smooth, round, without bulging, eccentricity and ellipticity ≤ 4%.

4. Slotted copper strip manufacturing process, slotted copper strip is automatically punched according to pre-designed groove structure, and size punching, punching pitch deviation ± 0.15mm, punching hole difference ± 0.2mm, slot Complete without burr, copper without oxidation, according to different performance requirements of customers, choose the corresponding groove type, the groove spacing and stroke of the punch must be within the required range

5. Vertical package and extrusion integration are carried out in the sheath production line, and the polyethylene foam insulation layer produced by physical foaming is pulled through the pay-off frame and passed through the arc groove type device in front of the extruder head. The slotted copper strip is tightly wrapped on the outside of the polyethylene foamed insulation layer, and the polyolefin outer sheath is extruded on the outside of the slotted copper strip by longitudinally wrapping and extrusion molding, using polyolefin, and extrusion temperature control At 120-160 ° C, after exiting the machine head, first pass through the hot water tank, the temperature is controlled to cool at 35 ° C ~ 40 ° C, and then through the cold water tank, the temperature is controlled at 20 ° C ~ 30 ° C for cooling, after drying, in the slotted copper A polyolefin outer sheath 5 is formed on the outer side of the belt, and is wound around the cabled disc to form an in-line composite leaky coaxial cable.

The surface of the polyolefin outer sheath of the in-line composite leaky coaxial cable should be complete, without holes and cracks.

The method for manufacturing a built-in optical cable composite leakage coaxial cable according to claim 3, wherein the surface of the polyolefin outer sheath of the in-line composite leakage coaxial cable is required to be complete, without holes and cracks.

The embedded optical cable composite leakage coaxial cable of the invention and the manufacturing method thereof have the following features:

The embedded optical cable composite leakage coaxial cable and the manufacturing method thereof relate to the market diversification. The composite leaky coaxial cable can have a wider market space and realize a multi-purpose cable.

1. Adopting the built-in design of optical cable, the optical cable has a relatively stable external environment in the process of transmitting optical signals, which reduces the influence of uncertain factors in the external environment. Effectively ensure reliable and stable transmission of optical signal information;

2. Solve the problem that some places cannot provide the installation of leaky coaxial cable and cable place at the same time due to limited space;

3. The embedded optical cable can strengthen the mechanical hardness of the leaky coaxial cable and is not easily crushed;

4. Eliminating the fixtures and other accessories required for the installation of fixed optical cables, from the perspective of market economy, it has advantages. Compared with the combination of the original leaky coaxial cable and the optical cable. More popular with customers.

DRAWINGS

The invention will be further described below in conjunction with the accompanying drawings:

1 is a schematic structural view of a built-in optical cable composite leakage coaxial cable according to the present invention.

2 is a schematic view showing the structure of an optical cable with a built-in optical cable composite leakage coaxial cable according to the present invention;

3 is a process flow diagram of a method for fabricating a built-in optical cable composite leaky coaxial cable according to the present invention.

detailed description

In order to further clarify the present invention, in order to achieve the intended purpose of the invention and the technical means and effects thereof, the in-line optical cable composite leaky coaxial cable and the manufacturing method thereof according to the present invention are described below with reference to the accompanying drawings and preferred embodiments. The detailed description and the structure will be described.

Referring to Figures 1, 2, and 3, the in-cell cable composite leakage coaxial cable includes a fiber optic cable 1, a braided copper tube 2, a polyethylene foamed insulation layer 3, a slotted copper strip 4, and a polyolefin outer sheath 5; The braided copper tube 2 is wrapped with a fiber optic cable 1 , and a polyethylene foamed insulating layer is extruded outside the braided copper tube 2, and a layer of slotted copper strip 4 is wrapped on the outside of the polyethylene foamed insulating layer 3 to be slotted. The outer surface of the copper strip 4 is extruded with a polyolefin outer sheath.

The optical cable 1 comprises a central reinforcing core 1-1, an optical fiber unit 1-2, a plastic coated aluminum tube 1-3 and a polyethylene outer sheath 1-4; a single fiber unit is surrounded around the central reinforcing core 1-1. 1-2, a plastic coated aluminum tube 1-3 is wrapped on the outer side of the optical fiber unit 1-2, and a polyethylene outer sheath 1-4 is extruded on the outer surface of the plastic coated aluminum tube 1-3. A center reinforcing core 1-1 is disposed at the center of the optical cable 1 to facilitate the wrapping of the single-core optical cable while increasing the strength of the optical cable and the leaky coaxial cable.

Referring to Figures 1, 2, and 3, the steps of the method for manufacturing the embedded optical cable composite leakage coaxial cable are as follows:

1. The fiber optic cable can be composed of a single fiber unit or a plurality of fiber units according to the needs of the customer. A single fiber unit is surrounded around the center reinforcing core, and a plastic coated aluminum tube is wrapped on the outside of the fiber unit. Extrusion of aluminum tube The outer sheath of the polyethylene requires that the outer diameter of the optical cable is smaller than the inner diameter of the braided copper tube to meet the requirements.

The embodiments of the present invention are not limited to the present invention. Those skilled in the art can create a new structure of in-line composite leakage coaxial according to the needs of use, the multi-mode structure of the optical cable and the different types of copper strips. Cables, therefore, variations and modifications without departing from the spirit of the invention are intended to be within the scope of the invention.

Claims

An embedded optical cable composite leakage coaxial cable, comprising: an optical cable, a braided copper tube, a polyethylene foamed insulation layer, a slotted copper strip and a polyolefin outer sheath; and is wrapped in a braided copper tube The optical cable is extruded with a polyethylene foamed insulation layer outside the braided copper tube, a layer of slotted copper strip is wrapped on the outside of the polyethylene foamed insulation layer, and a polyolefin outer sheath is extruded on the outside of the slotted copper strip. .
The embedded optical cable composite leakage coaxial cable according to claim 1, wherein said optical cable comprises a central reinforcing core, an optical fiber unit, a plastic coated aluminum tube and a polyethylene outer sheath; and around the central reinforcing core Surrounded by a single fiber unit, a plastic coated aluminum tube is wrapped on the outside of the fiber unit, and a polyethylene outer sheath is extruded on the outside of the plastic coated aluminum tube.
The method for manufacturing a built-in optical cable composite leakage coaxial cable according to claim 1, wherein:
The fiber optic cable can be composed of a single fiber unit or a plurality of fiber units according to the needs of the customer. A single fiber unit is surrounded around the center reinforcing core, and a plastic coated aluminum tube is wrapped on the outside of the fiber unit in the plastic coated aluminum tube. Extrusion of a layer of polyethylene outer sheath on the outside requires that the outer diameter of the cable is smaller than the inner diameter of the braided copper tube.
The ribbed copper tube is bent and rounded by the U-shaped groove after being cut by the U-shaped groove, and the optical cable is wrapped inside, and is welded into a closed copper tube by argon arc welding gas welding. The eccentric weaving method makes the smooth copper tube into a spiral-shaped copper tube, and the weld seam is not required to have a problem of virtual welding. The thickness of the copper strip should conform to the standard; the peaks, troughs and pitch of the zigzag formation should be within strict control requirements.
After the production of the braided copper tube is completed, the extruded polyethylene foam insulation layer is continuously carried out in the physical foaming production line. First, the endothelium material is squeezed on the outside of the braided copper tube. The endothelium material is made of low-density polyethylene. The temperature of the endothelial extruder is controlled at 140 ° C ~ 200 ° C, and the surface is directly extruded to the outside of the braided copper tube. An endothelial layer is formed; then a polyethylene foamed insulation layer is extruded outside the endothelial layer. The polyethylene foam insulation material is a mixture of low density polyethylene, high density polyethylene and nucleating agent, and the weight ratio of low density polyethylene, high density polyethylene and nucleating agent is 74:25:1; The material of the nucleating agent is a polyethylene material. The mixture is injected with nitrogen or carbon dioxide gas at a high pressure in a molten state at 130 ° C to 200 ° C. Under the action of rotation and shear of the screw, the molten plastic and the gas are thoroughly mixed, and the molten polyethylene mixture and the gas are mixed and nucleated, and the foaming mixture is passed. The extrusion head is uniformly and stably extruded, coated on the outside of the above-mentioned braided copper tube extruded with the endothelial layer to form a polyethylene foamed insulation layer, and the temperature of the extruder is controlled at 130 ° C to 200 ° C. After the temperature of the hot water bath is cooled (35 ° C ~ 40 ° C), it is cooled by a cold water tank (20 ° C ~ 30 ° C), dried, and finally wound on the disc. It is required that no cell can be formed between the inner layer and the polyethylene foam insulating layer, and the outer surface of the polyethylene foamed insulating layer is smooth, round, without bulging, eccentricity and ellipticity ≤ 4%.
Slotted copper strip manufacturing process, slotted copper strip is automatically punched according to the pre-designed groove structure, and size punching, punching pitch deviation ± 0.15mm, punching hole difference ± 0.2mm, slot hole intact Burr, copper is non-oxidized, according to different performance requirements of customers, choose the corresponding groove type, the groove spacing and stroke of the punch must be within the required range
Vertically wrapped, extruded and integrated in the sheath production line, the plastic foamed insulation layer produced by physical foaming, After the wire take-up frame is pulled, the circular grooved device is placed in front of the extruder head, and the slotted copper strip is tightly wrapped around the outer surface of the polyethylene foamed insulation layer, and is slotted by the longitudinal package and the extrusion molding method. The outer surface of the copper strip is extruded with a polyolefin outer sheath, and the polyolefin is used. The extrusion temperature is controlled at 120-160 ° C. After exiting the machine head, the hot water tank is passed through, and the temperature is controlled at 35 ° C to 40 ° C for cooling. The cold water tank is cooled at a temperature of 20 ° C to 30 ° C. After being blown dry, a polyolefin outer sheath 5 is formed on the outside of the slotted copper strip, and wound around the cabled disc to form an in-line composite leak coaxial. cable.

The surface of the polyolefin outer sheath of the in-line composite leaky coaxial cable should be complete, without holes and cracks.