Communication cable and production method thereof

Abstract

The invention discloses a communication cable and a production method thereof. The communication cable comprises a conductor, an insulating layer, a shielding layer, an optical fiber net and a sheath which are sequentially arranged from inside to outside. Wherein the optical fibers are fixedly arranged and laid to form the optical fiber net, the optical fiber net is in a grid shape, the optical fiber net is fixed on the shielding layer in a wrapping mode, and the shielding layer is arranged outside the conductor in a sleeving mode. The insulating layer is prepared by blending a polyvinyl chloride cross-linked body and a polyethylene cross-linked body according to a ratio of 1: (0.5-1.5). Magnesium is introduced into an aluminum-silicon alloy to manufacture the shielding layer, and the shielding layer is composed of, by mass, 80%-90% of aluminum, 3%-12% of silicon and 1%-3% of magnesium. According to the communication cable, the temperature resistance of the insulating layer is optimized, magnesium with good conductivity and magnetism is introduced into the aluminum-silicon alloy, the electromagnetic shielding performance is optimized, electromagnetic interference can be well resisted, and the communication cable which is excellent in comprehensive performance, good in weather resistance and capable of positioning a damaged position is produced.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of cable manufacturing, in particular to a communication cable, and a production method of the communication cable. BACKGROUND

[0002] In the field of communication, the mobile communication cable for base station is a kind of commonly used base station signal transmission cable, which is widely used in mobile communication base station signal transmission, signal distribution and other information transmission. With the progress of science and technology and the development of society, people's demand for network is getting higher and higher. In practical application, there are more and more occasions that require mobile communication signals and the requirements for signal transmission are getting higher and higher.

[0003] Referring to the patent application No. CN116052946A, a kind of communication cable and its production method are disclosed, which adopts three-layer structure for insulation layer, and the innermost layer directly contacting with inner conductor is mixed with foam polyolefin and steel fiber, the middle layer is made of hollow type by foam polyolefin, and the outermost layer is made of foam polyolefin. The technical content is analyzed in detail, and the problems are as follows: the foam polyolefin is polyethylene product, which will soften, fuse and deform after high temperature, resulting in poor temperature resistance of the communication cable insulation layer, affecting the weather resistance and stability of the communication cable. SUMMARY

[0004] In view of the above-mentioned shortcomings of the prior art, the present application aims to provide a kind of communication cable and its production method.

[0005] A kind of communication cable, which includes conductor, insulation layer, shielding layer, optical fiber network and sheath arranged from inside to outside;Wherein, the optical fiber is arranged by fixed arrangement to form the optical fiber network, and the optical fiber network is in grid shape, the optical fiber network is fixedly covered on the shielding layer, and the shielding layer is sleeved outside the conductor.

[0006] As a further improvement of the above-mentioned scheme, the optical fiber is arranged in a reciprocating manner of horizontal, vertical, horizontal and vertical, forming a continuous and non-repetitive optical fiber network in each grid, and in the optical fiber network, there is only one optical fiber passing through each grid, one end of the communication cable is connected to the power distribution center, and the power distribution center is provided with an optical time domain reflectometer for emitting optical signal, and one end of the optical fiber is connected to the power distribution center through the optical time domain reflectometer.

[0007] As a further improvement of the above-mentioned scheme, a mapping table of optical signal transmission distance in optical fiber and optical fiber network grid number is stored in the power distribution center; the mapping table is formed according to the length of the laid optical fiber, and the optical transmission distance corresponds to the length of the optical fiber.

[0008] As a further improvement of the above-mentioned scheme, at least five copper wires are twisted to obtain the conductor, and the copper wires are made of oxygen-free copper material with a purity of 99.9%; and the conductor is plated with a silver layer on the surface. The present application is based on high-purity oxygen-free copper material to make the conductor, so as to ensure the stability of signal transmission and reduce the loss. At the same time, the surface silver plating treatment is matched to reduce the contact resistance of the conductor, improve the conductivity, and optimize the signal transmission efficiency to meet the demand of high-frequency communication of communication cables.

[0009] As a further improvement of the above-mentioned scheme, the insulating layer is filled between the conductor and the shielding layer; the insulating layer has the following components: polyvinyl chloride crosslinked body and polyethylene crosslinked body are blended in a ratio of 1:0.5~1.5 to make the insulating layer.

[0010] As a further improvement of the above-mentioned scheme, magnesium is introduced into the aluminum-silicon alloy to make the shielding layer, and the mass composition of the shielding layer is as follows: aluminum 80%~90%, silicon 3%~12%, magnesium 1%~3%. In the present application, magnesium with good conductivity and magnetism is introduced into the aluminum-silicon alloy. Under the external electric field, magnesium quickly establishes an internal electric field, weakens the penetration ability of the external electric field, effectively absorbs the stray magnetic field, reflects part of the electromagnetic wave to change the propagation trajectory of the electromagnetic wave, enhances the comprehensive performance of the obtained shielding layer, optimizes the electromagnetic shielding performance, and can well resist electromagnetic interference, which is beneficial to the signal transmission of the communication cable.

[0011] As a further improvement of the above-mentioned scheme, polyethylene, polyurethane, nylon, phosphorus-nitrogen compound and lubricant are mixed to make the sheath. In the present application, polyethylene+polyurethane is introduced into the sheath to meet the wear resistance, nylon is introduced to improve the tensile strength, phosphorus-nitrogen compound is introduced to provide flame retardant protection, and lubricant is introduced to play a laying protection role. The above-mentioned components synergistically optimize the comprehensive performance of the outer material of the communication cable, improve the weather resistance of the communication cable, and prolong the service life.

[0012] As a further improvement of the above scheme, the sheath has a mass fraction composition as follows: polyethylene 30%~60%, polyurethane 10%~40%, nylon 4%~10%, phosphorus-nitrogen compound 2%~7%, lubricant 1%~5%. In the present application, the phosphorus-nitrogen compound is introduced into the sheath to impart flame-retardant properties. Specifically, when the phosphorus-nitrogen compound is decomposed by heat, it is easy to release non-combustible gases such as ammonia, nitrogen, deep nitrogen oxides, and water vapor. On the one hand, the generation of these gases and the endothermic decomposition of the phosphorus-nitrogen compound take away most of the heat, greatly reducing the surface temperature, diluting the concentration of oxygen in the air and the combustible gases generated by the thermal decomposition of the polymer. On the other hand, the reaction of non-combustible gases with oxygen in the air generates nitrogen, water, and deep oxides, which consumes oxygen and achieves good flame-retardant effect.

[0013] As a further improvement of the above scheme, the lubricant is stearic acid or oleic acid. In the present application, the introduced lubricant migrates to the surface due to its low compatibility with polyethylene, thereby modifying the surface of polyethylene. The sheath has sliding and anti-sticking properties, thereby reducing the friction and traction force during the laying of the communication cable and reducing the probability of damage to the communication cable.

[0014] A production method of a communication cable, comprising the following steps: (1) oxygen-free copper material with a purity of 99.9% is stretched into copper wires through a multi-die drawing machine, the copper wire surface is plated with silver and then annealed, and a plurality of copper wires are stranded by a pipe stranding machine to obtain a conductor; (2) polyvinyl chloride is taken to react under the initiation of diallyl phthalate to obtain a polyvinyl chloride crosslinked body, polyethylene is taken to react under the initiation of dicumyl peroxide to obtain a polyethylene crosslinked body, the polyvinyl chloride crosslinked body and the polyethylene crosslinked body are blended in a mixing machine to obtain an insulating material, the insulating material is extruded on a double roller mill to form a sheet, and then is placed in a flat vulcanizing machine to press to obtain an insulating layer; (3) aluminum-silicon alloy and magnesium are put into a vacuum furnace, melted at 650~700°C to obtain an alloy liquid, and then subjected to two-stage annealing treatment to obtain a shielding material, the shielding material is extruded on a double roller mill, and then is placed in a flat vulcanizing machine to press to obtain a shielding layer; (4) polyethylene, polyurethane, and nylon are first mixed and melted on a double roller mill, the mixing temperature is 125~135°C, then the phosphorus-nitrogen compound and the lubricant are added and mixed for 15~25 min, and then the sheet is taken out of the double roller mill, and then is placed in a flat vulcanizing machine to press to obtain a sheath of the communication cable; (5) the insulating layer prepared in step (2) is coated on the conductor obtained in step (1) through an extruder, and is cooled and shaped through a water cooling tank to obtain a cable core; (6) sequentially pass the shielding layer obtained in step (3), the optical fiber net and the sheath obtained in step (4) through the extruder to wrap the cable core obtained in step (5), and obtain the communication cable product after cooling.

[0015] As a further improvement of the above scheme, in step (3), the two-stage annealing treatment comprises intermediate annealing and finished product annealing, wherein the temperature of the intermediate annealing is 280-320 DEG C, and the annealing time is 30-50 min; the temperature of the finished product annealing is 250-300 DEG C, and the annealing time is 20-40 min.

[0016] Compared with the prior art, the present application has the following beneficial effects: In the present application, the polyvinyl chloride with good processability and low cost and the polyethylene with good electrical properties are crosslinked respectively, and the crosslinked bodies of the two are combined, and the molecular structure after crosslinking becomes a three-dimensional combined structure, which will not melt and flow even if the temperature rises above the melting point, overcoming the problem that polyvinyl chloride and polyethylene soften, fuse and deform after being subjected to high temperature, so that the temperature resistance of the prepared insulation layer is optimized, and the insulation protection function is better played.

[0017] In the present application, magnesium with good electrical conductivity and magnetic property is introduced into aluminum-silicon alloy to optimize the electromagnetic shielding performance, which can well resist electromagnetic interference and is beneficial to signal transmission of the communication cable.

[0018] The communication cable prepared by the present application has excellent comprehensive performance and good weather resistance, and the damaged position can be located for troubleshooting and maintenance, so the application has excellent popularization prospect. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 Fig. 1 is a cross-sectional view of a communication cable provided by the present application.

[0020] 1, conductor; 2, insulation layer; 3, shielding layer; 4, optical fiber net; 5, sheath.

[0021] The above main element symbol explanations are further explained in detail in combination with the drawings and the specific embodiments. DETAILED DESCRIPTION

[0022] In order to make the objects, technical solutions and advantages of the present application clearer, the following will further describe the present application with examples. The additional aspects and advantages of the present application will be partly given in the following description, partly will become obvious from the following description, or will be understood through the practice of the present application. It should be understood that the following description is only used to explain the present application, and is not used to limit the present application.

[0023] The following will describe the specific examples of the present application in detail.

[0024] Example 1

[0025] The present example provides a production method of a communication cable, which comprises the following steps: (1) The oxygen-free copper material with a purity of 99.9% is stretched into copper wires through a multi-die drawing machine, the copper wires are silver-plated and then annealed, and a plurality of copper wires are twisted through a pipe twisting machine to obtain a conductor 1. In the present example, the conductor 1 is made of high-purity oxygen-free copper material to ensure the stability of signal transmission and reduce the loss. At the same time, the surface silver-plating treatment is used to reduce the contact resistance of the conductor 1, improve the conductivity, and optimize the signal transmission efficiency to meet the demand of high-frequency communication of the communication cable. The purpose of annealing is to reduce the hardness of the copper wires, enhance the toughness, and prevent oxidation.

[0026] (2) The polyvinyl chloride is taken to react under the initiation of diallyl phthalate to obtain a polyvinyl chloride crosslinking body, and the polyethylene is taken to react under the initiation of dicumyl peroxide to obtain a polyethylene crosslinking body. The polyvinyl chloride crosslinking body and the polyethylene crosslinking body are blended in a mixing machine at a ratio of 1:0.5 to obtain an insulating material. The insulating material is extruded on a double-roller open mill, and then is pressed in a flat vulcanizing machine to obtain an insulating layer 2. In the present example, the polyvinyl chloride with good processability and low cost and the polyethylene with good electrical performance are crosslinked respectively, and the crosslinking bodies of the two are combined. The molecular structure of the crosslinked bodies becomes a three-dimensional combined structure, which will not melt and flow even if the temperature rises above the melting point, overcoming the problem that the polyvinyl chloride and the polyethylene soften, melt and deform when high temperature is encountered. The temperature resistance of the prepared insulating layer is optimized, and the insulating protection function is better played.

[0027] (3) The aluminum-silicon alloy and magnesium are put into a vacuum furnace, and are smelted at 650℃ to obtain an alloy liquid. Then, a two-stage annealing treatment is adopted to obtain a shielding material. The two-stage annealing treatment comprises intermediate annealing and finished product annealing. The temperature of the intermediate annealing is 280℃, and the annealing time is 30 min. The temperature of the finished product annealing is 250℃, and the annealing time is 20 min. The shielding material is extruded on a double-roller open mill, and then is pressed in a flat vulcanizing machine to obtain a shielding layer 3. The mass composition of the prepared shielding layer 3 is as follows: aluminum 90%, silicon 9%, and magnesium 1%.

[0028] In this embodiment, magnesium with good electrical conductivity and magnetic properties is introduced into the aluminum-silicon alloy. Under the external electric field, magnesium quickly establishes an internal electric field, weakening the penetration ability of the external electric field, and effectively absorbing the stray magnetic field, reflecting part of the electromagnetic waves to change the propagation trajectory of the electromagnetic waves, enhancing the comprehensive performance of the obtained shielding layer 3, optimizing its electromagnetic shielding performance, and well resisting electromagnetic interference, which is beneficial to the signal transmission of the communication cable. At the same time, by optimizing the annealing process, the elongation of the shielding material is improved from 12% to 18%, so that the obtained shielding layer 3 can deform plastically without breaking when subjected to external forces such as tension or bending, and has better impact resistance and fatigue resistance.

[0029] (4) First, polyethylene, polyurethane, and nylon are mixed and melted on a two-roll open mill, the mixing temperature is 125°C, then phosphorus-nitrogen compound and stearic acid are added and mixed for 15 minutes, then the sheet is taken out of the two-roll open mill, and then placed in a flat curing machine to press to obtain the sheath 5 of the communication cable. The mass parts of the obtained sheath 5 are as follows: polyethylene 50%, polyurethane 20%, nylon 10%, phosphorus-nitrogen compound 7%, and stearic acid 3%.

[0030] In this embodiment, phosphorus-nitrogen compound is introduced into the sheath 5 to impart flame retardant properties. Specifically, when the phosphorus-nitrogen compound is heated and decomposed, it easily releases non-combustible gases such as ammonia, nitrogen, deep nitrogen oxides, and water vapor. On the one hand, the generation of these gases and the heat absorption of the decomposition of the phosphorus-nitrogen compound take away most of the heat, greatly reducing the surface temperature, diluting the concentration of oxygen in the air and the combustible gases generated by the thermal decomposition of the polymer. On the other hand, the non-combustible gases react with oxygen in the air to generate nitrogen, water, and deep oxides, consuming oxygen and achieving good flame retardant effect. The introduced stearic acid has low compatibility with polyethylene and can migrate to the surface, thereby modifying the surface of polyethylene and imparting sliding and anti-sticking properties to the sheath 5, thereby reducing the friction and traction force during the laying of the communication cable and reducing the probability of damage to the communication cable.

[0031] The sheath 5 of this embodiment introduces polyethylene + polyurethane to meet the wear resistance, introduces nylon to improve the tensile strength, introduces phosphorus-nitrogen compound to provide flame retardant protection, and introduces lubricant to play a laying protection role. The aforementioned components synergistically optimize the comprehensive performance of the outer material of the communication cable, improve the weather resistance of the communication cable, and prolong its service life.

[0032] (5) The insulating layer 2 obtained in step (2) is coated on the conductor 1 obtained in step (1) by an extruder, and is cooled and shaped by a water cooling tank to obtain a cable core.

[0033] (6) The shielding layer 3 obtained in step (3), the optical fiber net 4, and the sheath 5 obtained in step (4) are sequentially wrapped on the cable core obtained in step (5) by means of an extruder, and a communication cable product is obtained after cooling.

[0034] Example 2

[0035] The present embodiment provides a production method of a communication cable, which comprises the following steps: (1) The same as example 1.

[0036] (2) The polyvinyl chloride cross-linking body is obtained by reacting polyvinyl chloride under the initiation of diallyl phthalate, and the polyethylene cross-linking body is obtained by reacting polyethylene under the initiation of dicumyl peroxide. The polyvinyl chloride cross-linking body and the polyethylene cross-linking body are blended in a mixing machine at a ratio of 1:1 to obtain an insulating material. The insulating material is extruded on a double roller mill and then pressed in a flat vulcanizing machine to obtain the insulating layer 2.

[0037] (3) The aluminum-silicon alloy and magnesium are put into a vacuum furnace, melted at 680°C to obtain an alloy liquid, and then subjected to two-stage annealing treatment to obtain a shielding material. The two-stage annealing treatment comprises intermediate annealing and finished product annealing. The temperature of the intermediate annealing is 300°C, and the annealing time is 40 min. The temperature of the finished product annealing is 270°C, and the annealing time is 30 min. The shielding material is extruded on a double roller mill and then pressed in a flat vulcanizing machine to obtain the shielding layer 3. The mass fraction composition of the prepared shielding layer 3 is as follows: aluminum 90%, silicon 8%, and magnesium 2%.

[0038] (4) The polyethylene, polyurethane, and nylon are first mixed and melted on a double roller mill at a mixing temperature of 132°C. Then, the phosphorus-nitrogen compound and oleic acid are added and mixed for 20 min. The product is then extruded from the double roller mill and pressed in a flat vulcanizing machine to obtain the sheath 5 of the communication cable. The mass fraction composition of the prepared sheath 5 is as follows: polyethylene 51%, polyurethane 35%, nylon 5%, phosphorus-nitrogen compound 6%, and oleic acid 3%. In the present embodiment, the introduced oleic acid migrates to the surface due to its low compatibility with polyethylene, thereby modifying the surface of polyethylene. As a result, the sheath 5 has sliding and anti-sticking properties, thereby reducing the friction and traction force during the laying of the communication cable and reducing the probability of damage to the communication cable.

[0039] (5) and (6), the same as example 1.

[0040] Example 3

[0041] The present embodiment provides a production method of a communication cable, which comprises the following steps: (1) The same as example 1.

[0042] (2) The polyvinyl chloride is taken to react under the initiation of diallyl phthalate to obtain a polyvinyl chloride crosslinking body, and the polyethylene is taken to react under the initiation of dicumyl peroxide to obtain a polyethylene crosslinking body. The polyvinyl chloride crosslinking body and the polyethylene crosslinking body are blended in a proportion of 1:1.2 in a mixing mill to obtain an insulating material. The insulating material is extruded on a double-roller open mill to obtain a sheet, and then is pressed in a flat vulcanizing machine to obtain the insulating layer 2.

[0043] (3) The aluminum-silicon alloy and magnesium are put into a vacuum furnace, and are smelted at 690°C to obtain an alloy liquid. The shielding material is obtained by adopting two-stage annealing treatment. The two-stage annealing treatment includes intermediate annealing and finished product annealing. The temperature of the intermediate annealing is 310°C, and the annealing time is 45 min. The temperature of the finished product annealing is 270°C, and the annealing time is 25 min. The shielding material is extruded on a double-roller open mill to obtain a sheet, and then is pressed in a flat vulcanizing machine to obtain the shielding layer 3. The mass fraction composition of the shielding layer 3 obtained is as follows: aluminum 89%, silicon 8%, and magnesium 3%.

[0044] (4) The same as in Example 2.

[0045] (5) (6), the same as in Example 1.

[0046] Example 4

[0047] The embodiment provides a production method of a communication cable, which comprises the following steps: (1) The same as in Example 1.

[0048] (2) The same as in Example 3.

[0049] (3) The aluminum-silicon alloy and magnesium are put into a vacuum furnace, and are smelted at 650-700°C to obtain an alloy liquid. The shielding material is obtained by adopting two-stage annealing treatment. The two-stage annealing treatment includes intermediate annealing and finished product annealing. The temperature of the intermediate annealing is 290°C, and the annealing time is 35 min. The temperature of the finished product annealing is 260°C, and the annealing time is 35 min. The shielding material is extruded on a double-roller open mill to obtain a sheet, and then is pressed in a flat vulcanizing machine to obtain the shielding layer 3. The mass fraction composition of the shielding layer 3 obtained is as follows: aluminum 85%, silicon 12%, and magnesium 3%.

[0050] (4) The polyethylene, the polyurethane and the nylon are first mixed and melted on a double-roller open mill at a mixing temperature of 130°C. Then the phosphorus-nitrogen compound and the oleic acid are added and mixed for 22 min. The mixture is then extruded on the double-roller open mill to obtain a sheet, and then is pressed in a flat vulcanizing machine to obtain the sheath 5 of the communication cable. The mass fraction composition of the sheath 5 obtained is as follows: polyethylene 55%, polyurethane 30%, nylon 5%, phosphorus-nitrogen compound 5% and oleic acid 5%.

[0051] (5) (6), the same as in Example 1.

[0052] Example 5

[0053] The embodiment provides a production method of a communication cable, which comprises the following steps: (1) The same as in Embodiment 1.

[0054] (2) The polyvinyl chloride is taken to react under the initiation of diallyl phthalate to obtain a polyvinyl chloride crosslinking body, and the polyethylene is taken to react under the initiation of dicumyl peroxide to obtain a polyethylene crosslinking body, the polyvinyl chloride crosslinking body and the polyethylene crosslinking body are blended in a proportion of 1:1.5 in a mixing machine to obtain an insulating material, the insulating material is extruded on a double-roller open mill to be sheeted, and then is pressed in a flat vulcanizing machine to obtain the insulating layer 2.

[0055] (3) The aluminum-silicon alloy and magnesium are put into a vacuum furnace, smelted at 700 DEG C to obtain an alloy liquid, and then subjected to two-stage annealing treatment to obtain a shielding material, the two-stage annealing treatment comprises intermediate annealing and finished product annealing, the temperature of the intermediate annealing is 320 DEG C, the annealing time is 50 min, the temperature of the finished product annealing is 300 DEG C, and the annealing time is 40 min, the shielding material is sheeted on a double-roller open mill, and then is pressed in a flat vulcanizing machine to obtain the shielding layer 3, and the prepared shielding layer 3 comprises the following components in mass parts: 87% of aluminum, 10% of silicon and 3% of magnesium.

[0056] (4) The polyethylene, the polyurethane and the nylon are first mixed and melted on a double-roller open mill, the mixing temperature is 135 DEG C, then the phosphorus-nitrogen compound and the oleic acid are added and mixed for 25 min, then the double-roller open mill is sheeted, and then the flat vulcanizing machine is pressed to obtain the sheath 5 of the communication cable, and the prepared sheath 5 comprises the following components in mass parts: 60% of polyethylene, 27% of polyurethane, 5% of nylon, 6% of the phosphorus-nitrogen compound and 2% of the oleic acid.

[0057] (5) and (6), the same as in Embodiment 1.

[0058] Embodiment 6

[0059] Please refer to Figure 1 The embodiment provides a communication cable, which is prepared by any production method in Embodiments 1 to 5, and is characterized in that the communication cable comprises, from inside to outside, a conductor 1 formed by at least five copper wires being twisted, an insulating layer 2, a shielding layer 3, a fiber mesh 4 and a sheath 5. The insulating layer 2 is filled between the conductor 1 and the shielding layer 3. The fiber mesh 4 is formed by fixedly arranging the optical fibers, the fiber mesh 4 is in a grid shape, the fiber mesh 4 is fixedly covered on the shielding layer 3, and the shielding layer 3 is sleeved outside the conductor 1.

[0060] The optical fiber is arranged in a horizontal, vertical, horizontal, and vertical reciprocating manner to form a light network 4 with continuous and non-repetitive grids, and in the light network 4, there is only one optical fiber passing through each of the four edges of each grid. One end of the communication cable is connected to the distribution center, and the distribution center is provided with an optical time domain reflectometer for emitting an optical signal. One end of the optical fiber is connected to the distribution center through the optical time domain reflectometer. The distribution center stores a mapping table of the transmission distance of the optical signal in the optical fiber and the grid number of the optical fiber network 4. The grid of the optical fiber network 4 is numbered according to the length of the optical fiber to form a mapping table, and the optical transmission distance corresponds to the length of the optical fiber. In this embodiment, the optical fiber is arranged in a horizontal, vertical, horizontal, and vertical reciprocating manner, and the grid is numbered according to the length of the optical fiber to establish a mapping table of the optical transmission distance and the grid number.

[0061] In this embodiment, the optical time domain reflectometer transmits the optical signal through the optical fiber, and the optical time domain reflectometer monitors the spectrum curve of the optical signal in the optical fiber in real time. The transmission distance of the optical signal in the optical fiber is measured according to the spectrum curve to send the transmission distance to the distribution center in real time. The distribution center compares the received distance signal with the total length of the optical fiber. When the optical fiber network 4 is damaged, the spectrum curve monitored by the optical time domain reflectometer changes at the damage position. The position of the mutation corresponds to the transmission distance of the optical signal in the optical fiber. At this time, the distance signal obtained by the distribution center is less than the total length of the optical fiber, thereby providing a basis for timely warning. At the same time, the mapping table of the optical transmission distance and the grid number is used to query the position of the damaged grid, thereby accurately positioning the damage position of the communication cable. The optical fiber network 4 can be repaired by optical fiber fusion.

[0062] In summary, the communication cable of the embodiment has the following advantages: good weather resistance, and the ability to locate the damage position for troubleshooting and maintenance.

[0063] The above embodiments are only preferred embodiments of the present application, and any simple modification, modification, and alternative change of the above embodiments according to the technical essence of the present application are within the scope of the technical solution of the present application.

Claims

1. A communication cable, characterized by The communication cable comprises a conductor (1), an insulation layer (2), a shielding layer (3), an optical fiber net (4) and a sheath (5) arranged from inside to outside in sequence.

2. The communication cable of claim 1, wherein, The optical fiber is arranged in a reciprocating manner of horizontal, vertical, horizontal and vertical, and each grid of the optical fiber net (4) is continuously and non-repetitively connected by light, and each grid has only one optical fiber passing through the four edges.

3. The communication cable of claim 2, wherein, The distribution center is provided with an optical time domain reflectometer for emitting optical signals.

4. The communication cable of claim 1 or 2, wherein, The distribution center stores a mapping table of the transmission distance of the optical signal in the optical fiber and the grid number of the optical fiber net (4).

5. The communications cable of claim 1, wherein, The conductor (1) is twisted by at least five copper wires, and the copper wire is made of oxygen-free copper material with a purity of 99.9%.

6. The communications cable of claim 1 wherein, The insulation layer (2) is filled between the conductor (1) and the shielding layer (3).

7. The communications cable of claim 1 wherein, The insulation layer (2) is made of polyvinyl chloride crosslinking body and polyethylene crosslinking body blended in a ratio of 1:0.5-1.

5.

8. The communication cable of claim 7, wherein, The shielding layer (3) is made of aluminum-silicon alloy with magnesium.

9. A method of producing a communication cable as claimed in any one of claims 1 to 8, characterized in that, The sheath (5) is made of polyethylene, polyurethane, nylon, phosphorus-nitrogen compound and lubricant. The lubricant is stearic acid or oleic acid. The method comprises the following steps: (1) The oxygen-free copper material with a purity of 99.9% is stretched into copper wires by a multi-mold drawing machine, and the copper wires are annealed after silver plating, and then a plurality of copper wires are twisted by a pipe twisting machine to obtain a conductor. (2) The polyvinyl chloride crosslinking body is obtained by reacting polyvinyl chloride under the initiation of diallyl phthalate, and the polyethylene crosslinking body is obtained by reacting polyethylene under the initiation of dicumyl peroxide. (3) The aluminum-silicon alloy and magnesium are put into a vacuum furnace, and the alloy liquid is obtained by melting at 650-700°C, and then the shielding material is obtained by two-stage annealing, and then the shielding material is pressed to obtain the shielding layer. (4) polyethylene, polyurethane, nylon are first mixed and melted on a two-roller open mill, the mixing temperature is 125-135°C, then the phosphorus-nitrogen compound and lubricant are added and mixed for 15-25 min, then the sheet is taken out from the two-roller open mill, and then placed in a flat vulcanizing machine to be pressed to obtain the sheath of the communication cable; (5) the insulating layer prepared in step (2) is coated on the conductor prepared in step (1) through an extruder, and cooled and shaped through a water cooling tank to obtain a cable core; (6) the shielding layer prepared in step (3), the optical fiber net and the sheath prepared in step (4) are sequentially wrapped on the cable core prepared in step (5) through an extruder, and a communication cable product is obtained after cooling.

10. The production method according to claim 9, characterized by, In step (3), the two-stage annealing treatment includes intermediate annealing and finished product annealing, wherein the temperature of the intermediate annealing is 280-320°C, and the annealing time is 30-50 min; the temperature of the finished product annealing is 250-300°C, and the annealing time is 20-40 min.

Images