阅读说明：本技术 一种用于智慧城市地下缆线管廊中的综合线缆制造方法 (Manufacturing method of comprehensive cable for smart city underground cable pipe gallery ) 是由 汤代兵 于 2019-08-21 设计创作，主要内容包括：本发明涉及线缆技术领域,尤其是一种用于智慧城市地下缆线管廊中的综合线缆制造方法,第一绝缘层使用一种负温度系数热敏聚合物作为绝缘材料,该材料在温度环境温度发生变化时,回路间的绝缘阻值随之变化,其电容值小,当发生过载或短路时,线缆导体不会产生火花,在可燃性气体环境中不发生闪爆,其防爆性能高。第一绝缘层挤包于第一内导体表面形成信号控制线缆不同颜色线芯,通过将两个不同颜色的线芯按一定的节距进行绞合形成线对,信号控制线缆共有四个线对,第一屏蔽层使用双面导体金属箔绕包于四个线对绞合体表面形成屏蔽体,屏蔽层出是使用密度为80％以上的镀锡金属网包覆于第一屏蔽层表面,形成第一层屏蔽结构,该结构具备良好的电磁兼容性。(The invention relates to the technical field of cables, in particular to a manufacturing method of an integrated cable used in an underground cable pipe gallery of a smart city. The first insulating layer is extruded and wrapped on the surface of the first inner conductor to form wire cores of different colors of the signal control cable, the two wire cores of different colors are twisted according to a certain pitch to form wire pairs, the signal control cable has four wire pairs, the first shielding layer is wrapped on the surfaces of the four wire pair twisted bodies by using double-sided conductor metal foils to form shielding bodies, and the shielding layer is wrapped on the surface of the first shielding layer by using a tinned metal net with the density of more than 80% to form a first layer shielding structure which has good electromagnetic compatibility.)

1. A manufacturing method of comprehensive cables for smart city underground cable pipe galleries is characterized by comprising the following steps:

s1: selecting a tin-plated copper conductor as a first inner conductor (1), and extruding a first insulating layer (2) on the surface of the first inner conductor (1) to form wire cores with different colors to form four signal wire pairs;

s2: wrapping a first shielding layer (3) on the surfaces of the four signal pair twisted bodies by using double-sided conductive metal foil;

s3: the surface of the first shielding layer (3) is coated with a second shielding layer (4) in a 360-degree braided net structure by adopting a tinned copper conductor to form a first shielding structure form of a signal control cable, and the surface of the second shielding layer (4) is extruded and coated with a first inner protective layer (5) by using a ceramic polyolefin material;

s4: selecting an oxygen-free tin-plated copper conductor as a second inner conductor (6), extruding and wrapping the surface of the second inner conductor (6) by using a polyethylene material physical foaming method through a three-layer co-extrusion method to construct a second insulating layer (7) to form a wire core, and longitudinally wrapping the surface of the second insulating layer (7) with a hot-melt double-sided conductive aluminum foil material to form a third shielding layer (8);

s5: a tinned copper conductor is wrapped on the surface of the third shielding layer (8) in a 360-degree braided net structure to form a fourth shielding layer (9) to construct a second shielding structure form of the communication coaxial cable, and then a ceramic polyolefin material is extruded on the surface of the fourth shielding layer (9) to form a second inner protection layer (10);

s6: a plurality of strands of soft tinned copper conductors are adopted as a third inner conductor (11), a power cable conductive wire core with a third insulating layer (12) is formed by extruding and wrapping a ceramic polyolefin material on the surface of the third inner conductor (11), and a layer of flame-retardant and fire-resistant glass fiber tape is wrapped on the surface of a power cable conductive wire core strand to form a fourth flame-retardant layer (13);

s7: a tinned copper conductor is wrapped on the surface of a fourth fire-resistant layer (13) in a 360-degree braided net structure to form a fifth shielding layer (14), a third shielding structure form of the power cable is constructed, and a ceramic polyolefin material is extruded and wrapped on the surface of the fifth shielding layer (14) to form a third inner protection layer (15) of the power cable;

s8: filling water-blocking yarns in the power cable, the signal control cable and the communication coaxial cable stranded body, and designing a second water-blocking layer (16) by adopting a longitudinal water-blocking structure to form a second water-blocking structure;

s9: wrapping a halogen-free low-smoke flame-retardant fiber cloth belt on the surface of the second water-resistant layer (16) to construct a third flame-resistant layer (17) to obtain a third flame-resistant structure of the integrated cable;

s10: a black halogen-free low-smoke flame-retardant material is extruded and wrapped on the surface of the third flame-retardant layer (17) and a first water-blocking layer (18) is formed by adopting a radial water-blocking structure design, so that a first water-blocking structure of the comprehensive cable is obtained;

s11: wrapping a round thin steel wire on the surface of the first water-resistant layer (18) at 360 degrees to form a compressive strength (19) to obtain a compressive strength layer;

s12: wrapping a ceramic-armored fireproof and fireproof mica tape on the surface of the compressive strength (19) to form a second fireproof layer (20) to obtain a second fireproof structure of the integrated cable;

s13: a ceramic halogen-free low-smoke polyolefin flame-retardant and flame-retardant sheath material is extruded and coated on the surface of a second flame-retardant layer (20) to form a first flame-retardant layer (21) to obtain a first flame-retardant structure of the comprehensive cable, and the surface of the first flame-retardant layer (21) is extruded and coated with a layer of crosslinkable flame-retardant polyolefin material by a double-layer co-extrusion method.

2. The manufacturing method of the integrated cable for the smart city underground cable pipe rack according to claim 1, wherein the first insulating layer (2) in S1 uses ntc thermosensitive polymer as an insulating material.

Technical Field

The invention relates to the technical field of cables, in particular to a comprehensive cable for an underground cable pipe gallery of a smart city.

Background

Because of underground pipe gallery because of being in special environment, its underfloor high low temperature, water level pressure, toxic gas, the animal gnaws and eat, combustible gas, the conflagration, corrosive substance etc. all can produce the destructiveness to the cable in the piping lane system, consequently the cable of each utility system connection usefulness becomes the controllability engineering in the piping lane management link in the wisdom city cable piping lane environment, and its effect is very crucial.

Disclosure of Invention

The invention aims to solve the defects in the prior art and provides a method for manufacturing an integrated cable used in an underground cable pipe gallery of a smart city.

In order to achieve the purpose, the invention adopts the following technical scheme:

a manufacturing method of an integrated cable used in an intelligent city underground cable pipe gallery is designed, and is characterized by comprising the following steps:

s1: selecting a tin-plated copper conductor as a first inner conductor (1), and extruding a first insulating layer (2) on the surface of the first inner conductor (1) to form wire cores with different colors to form four signal wire pairs;

s2: wrapping a first shielding layer (3) on the surfaces of the four signal pair twisted bodies by using double-sided conductive metal foil;

s3: the surface of the first shielding layer (3) is coated with a second shielding layer (4) in a 360-degree braided net structure by adopting a tinned copper conductor to form a first shielding structure form of a signal control cable, and the surface of the second shielding layer (4) is extruded and coated with a first inner protective layer (5) by using a ceramic polyolefin material;

s4: selecting an oxygen-free tin-plated copper conductor as a second inner conductor (6), extruding and wrapping the surface of the second inner conductor (6) by using a polyethylene material physical foaming method through a three-layer co-extrusion method to construct a second insulating layer (7) to form a wire core, and longitudinally wrapping the surface of the second insulating layer (7) with a hot-melt double-sided conductive aluminum foil material to form a third shielding layer (8);

s5: a tinned copper conductor is wrapped on the surface of the third shielding layer (8) in a 360-degree braided net structure to form a fourth shielding layer (9) to construct a second shielding structure form of the communication coaxial cable, and then a ceramic polyolefin material is extruded on the surface of the fourth shielding layer (9) to form a second inner protection layer (10);

s6: a plurality of strands of soft tinned copper conductors are adopted as a third inner conductor (11), a power cable conductive wire core with a third insulating layer (12) is formed by extruding and wrapping a ceramic polyolefin material on the surface of the third inner conductor (11), and a layer of flame-retardant and fire-resistant glass fiber tape is wrapped on the surface of a power cable conductive wire core strand to form a fourth flame-retardant layer (13);

s7: a tinned copper conductor is wrapped on the surface of a fourth fire-resistant layer (13) in a 360-degree braided net structure to form a fifth shielding layer (14), a third shielding structure form of the power cable is constructed, and a ceramic polyolefin material is extruded and wrapped on the surface of the fifth shielding layer (14) to form a third inner protection layer (15) of the power cable;

s8: filling water-blocking yarns in the power cable, the signal control cable and the communication coaxial cable stranded body, and designing a second water-blocking layer (16) by adopting a longitudinal water-blocking structure to form a second water-blocking structure;

s9: wrapping a halogen-free low-smoke flame-retardant fiber cloth belt on the surface of the second water-resistant layer (16) to construct a third flame-resistant layer (17) to obtain a third flame-resistant structure of the integrated cable;

s10: a black halogen-free low-smoke flame-retardant material is extruded and wrapped on the surface of the third flame-retardant layer (17) and a first water-blocking layer (18) is formed by adopting a radial water-blocking structure design, so that a first water-blocking structure of the comprehensive cable is obtained;

s11: wrapping a round thin steel wire on the surface of the first water-resistant layer (18) at 360 degrees to form a compressive strength (19) to obtain a compressive strength layer;

s12: wrapping a ceramic-armored fireproof and fireproof mica tape on the surface of the compressive strength (19) to form a second fireproof layer (20) to obtain a second fireproof structure of the integrated cable;

s13: a ceramic halogen-free low-smoke polyolefin flame-retardant and flame-retardant sheath material is extruded and coated on the surface of a second flame-retardant layer (20) to form a first flame-retardant layer (21) to obtain a first flame-retardant structure of the comprehensive cable, and the surface of the first flame-retardant layer (21) is extruded and coated with a layer of crosslinkable flame-retardant polyolefin material by a double-layer co-extrusion method.

Preferably, the first insulating layer (2) in S1 uses a negative temperature coefficient thermosensitive polymer as an insulating material.

The invention provides a manufacturing method of a comprehensive cable for an underground cable pipe gallery of a smart city, which has the beneficial effects that: the novel water-resistant and explosion-proof composite material meets the requirements of flame retardance, water resistance, corrosivity, rat and ant bite resistance, high and low temperature resistance, pressure resistance and explosion resistance on the performance, and is characterized in that a two-layer water-resistant structure and a three-layer fire-resistant structure are arranged by using a new material and in a structural design, and a physical compression-resistant layer and a three-layer shielding structure are added.

Drawings

Fig. 1 is a schematic diagram of a comprehensive cable structure used in a smart city underground cable pipe gallery.

In the figure: the anti-explosion inner conductor comprises a first inner conductor 1, a first insulating layer 2, a first shielding layer 3, a second shielding layer 4, a first inner protective layer 5, a second inner conductor 6, a second insulating layer 7, a third shielding layer 8, a fourth shielding layer 9, a second inner protective layer, 10, a third inner conductor 11, a third insulating layer 12, a fourth flame retardant coating 13, a fifth shielding layer 14, a third inner protective layer 15, a second water blocking layer 16, a third flame retardant coating 17, a first water blocking layer 18, a compressive strength 19, a second flame retardant coating 20 and a first flame retardant coating 21.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments.

Referring to fig. 1, a method for manufacturing an integrated cable for a smart city underground cable pipe gallery includes the steps of:

s1: extruding a first insulating layer 2 to wrap the surface of a first inner conductor 1 to form wire cores with different colors to form four signal wire pairs, wherein the first inner conductor 1 is a tin-plated copper conductor, and the first insulating layer 2 uses a negative temperature coefficient thermosensitive polymer as an insulating material;

s2: wrapping the first shielding layer 3 on the surfaces of the four signal line pair twister bodies by using double-sided conductive metal foil;

s3: coating the second shielding layer 4 on the surface of the first shielding layer 3 by using a tinned copper conductor in a 360-degree braided net structure to form a first shielding structure form of a signal control cable, and extruding and coating the first inner protection layer 5 on the surface of the second shielding layer 4 by using a ceramic polyolefin material;

s4: a second insulating layer 7 is extruded and coated on the surface of a second inner conductor 6 by a physical foaming polyethylene material through a three-layer co-extrusion method to form a wire core, the second inner conductor 6 is an oxygen-free tin-plated copper conductor, and a third shielding layer 8 is longitudinally coated on the surface of the second insulating layer 7 by a hot-melt double-sided conductive aluminum foil material;

s5: the fourth shielding layer 9 is coated on the surface of the third shielding layer 8 in a 360-degree braided net structure by using a tin-plated copper conductor to form a second shielding structure form of the communication coaxial cable, and then the second inner protection layer 10 is extruded and coated on the surface of the fourth shielding layer 9 by using a ceramic polyolefin material;

s6: a third insulating layer 12 is extruded and coated on the surface of a third inner conductor 11 by using a ceramic polyolefin material to form a power cable conductive core, and a fourth flame retardant layer 13 is wrapped on the surface of a power cable conductive core strand by using a layer of flame retardant and flame retardant glass fiber tape;

s7: the fifth shielding layer 14 is coated on the surface of the fourth fire-resistant layer 13 in a 360-degree braided net structure through a tinned copper conductor to form a third shielding structure form of the power cable, and the third inner protection layer 15 is extruded and coated on the surface of the fifth shielding layer 14 by using a ceramic polyolefin material to form the power cable;

s8: the second water-blocking layer 16 is designed by a longitudinal water-blocking structure, and water-blocking yarns are filled in the power cable, the signal control cable and the communication coaxial cable stranded body to form a second water-blocking structure;

s9: the third fire-resistant layer 17 is a third fire-resistant structure formed by wrapping a halogen-free low-smoke flame-retardant fiber cloth tape on the surface of the second water-resistant layer 16;

s10: the first water-blocking layer 18 is designed by a radial water-blocking structure, and is extruded on the surface of the third flame-retardant layer 17 by using a black halogen-free low-smoke flame-retardant material, so that a first water-blocking structure of the comprehensive cable is formed;

s11: the compressive strength 19 is wrapped on the surface of the first water-resistant layer 18 by 360 degrees by using a round thin steel wire to form a compressive strength layer;

s12: the second fireproof layer 20 is formed by wrapping a ceramic fireproof mica tape on the surface of the compressive strength 19 to form a second fireproof structure of the integrated cable;

s13: the first fire-resistant layer 21 is formed by extruding a ceramic halogen-free low-smoke polyolefin fire-resistant sheath material on the surface of the second fire-resistant layer 20 to form a first fire-resistant structure of the integrated cable, and the surface of the first fire-resistant layer 21 is extruded with a layer of crosslinkable fire-resistant polyolefin material by a double-layer co-extrusion method.

The specific implementation process of the invention is as follows: the first inner conductor 1 of the signal control cable is a tinned copper conductor which has excellent oxidation resistance and corrosion resistance, the first insulating layer 2 is made of a negative temperature coefficient thermosensitive polymer serving as an insulating material, the insulating resistance between loops of the material changes along with the change of the temperature of a temperature environment, the capacitance value of the material is small, the cable conductor cannot generate sparks when overload or short circuit occurs, flash explosion does not occur in a combustible gas environment, and the explosion resistance of the cable is high.

In addition, an alarm is given out through a connecting device, the first insulating layer 2 is extruded and wrapped on the surface of the first inner conductor 1 to form wire cores of different colors of a signal control cable, the wire cores of two different colors are twisted according to a certain pitch to form wire pairs, and the signal control cable is provided with four wire pairs which are respectively connected with devices with bus interfaces, such as fire fighting, temperature sensing, toxic gas and the like. The first shielding layer 3 is wrapped on the surfaces of the four wire pair twisted bodies by using double-sided conductor metal foil to form a shielding body, the shielding layer outlet 4 is wrapped on the surface of the first shielding layer 3 by using a tinned metal net with the density of more than 80 percent to form a first layer shielding structure, and the structure has good electromagnetic compatibility and simultaneously has the technical requirements of an explosion-proof system.

The first inner protective layer 5 is extruded on the surface of the second shielding layer 4 by using a ceramic polyolefin material, and the material has good flame retardance and fire resistance. The second inner conductor 6 of the communication coaxial cable is a tinned copper conductor, the second insulating layer 7 is wrapped on the surface of the second inner conductor 6 in a physical foaming three-layer co-extrusion structure in an extrusion mode to form a wire core, and the communication coaxial cable has the characteristic of small attenuation in high-frequency signal transmission. The third shielding layer 8 is made of a hot-melt double-sided conductive aluminum foil material and has good electromagnetic radiation resistance, the fourth shielding layer 9 is coated on the surface of the third shielding layer 8 through a tinned metal net with the density of more than 80% to form a second shielding layer structure, and the structure has good electromagnetic compatibility and meets the requirement of good anti-interference capability of the communication coaxial cable.

The second inner sheath 10 is extruded on the surface of the fourth shielding layer 9 by using a ceramic polyolefin material, and the material enables the communication coaxial cable to have good flame retardance and fire resistance. The third inner conductor 11 of the power cable uses a multi-strand soft tin-plated copper conductor, and has a small resistance and a certain corrosion resistance. The third insulating layer 12 is formed by extruding a ceramic polyolefin material on the surface of the third inner conductor 11 to form a conductive wire core, the material can be burnt into a hard ceramic shell when exposed fire burns, the ceramic armor body burnt at a higher temperature for a longer time is harder, the ceramic armor body can form honeycomb ceramic fine pores, so that the effects of fire insulation, heat insulation and water retaining can be well achieved, and the excellent flame retardance can also play a good role in fire prevention.

The fourth flame retardant coating 13 selects a layer of flame retardant and fire resistant glass fiber belt, the material performance meets the stipulated requirements of a JB/T12165-2015 halogen-free low-smoke flame retardant glass fiber cloth belt for electrical insulation, and the fifth shielding layer 14 selects a tin-plated copper woven mesh with the density of more than 80% to cover the surface of the fourth flame retardant coating 13 to form a third layer shielding structure, so that the interference of electromagnetism to a signal cable is favorably reduced. The third inner protective layer 15 is formed by extruding and wrapping a ceramic polyolefin material on the surface of the fifth shielding layer 14 to form a power cable, the material can be burnt into a hard ceramic shell when burning in open fire, the ceramic armor body burnt at a higher temperature for a longer time is harder, the ceramic armor body can form honeycomb ceramic fine micropores, so that good fire insulation, heat insulation and water retaining effects can be achieved, and the excellent flame retardance can also play a good role in fire prevention.

The second water-blocking layer 16 is designed by a longitudinal water-blocking structure, a water-blocking yarn is filled in a power cable, a signal control cable and a communication coaxial cable stranded body to form a second water-blocking structure, the related performance of the water-blocking yarn meets the requirements specified in the communication industry standard YD/T1115.2-2001, and the water-blocking mechanism of the filled water-blocking yarn is as follows: if the comprehensive cable is cracked or damaged by external force under the action of natural conditions in the pipe gallery, moisture or humidity can penetrate deeply along the internal structure of the cable, the moisture and humidity can be absorbed by the water-blocking yarns, and the water-blocking materials rapidly expand to form gel-like substances after absorbing water to block a water-permeable channel and stop further inward diffusion and extension of the moisture and humidity, so that the wetting degree of the moisture or the humidity on the cable is reduced to the minimum, and the water-blocking effect is achieved. The third flame retardant coating 17 is wrapped on the surface of the second water resistant layer 16 by using a halogen-free low-smoke flame-retardant fiber cloth tape, the material performance meets the requirements of the specification of the halogen-free low-smoke flame-retardant glass fiber cloth tape for JB/T12165-2015 electrical insulation, and a third flame retardant structure of the comprehensive cable is formed by utilizing the wrapping material structure.

The first water-blocking layer 18 is made of a black halogen-free low-smoke flame-retardant material, the performance of the black halogen-free low-smoke flame-retardant material meets the performance requirement specified in the GB/T32129-2015 standard, the material is a linear flame-retardant high-density polyolefin material and has a longitudinal water-blocking function and a flame-retardant function, and the structure forms a first water-blocking structure of the integrated cable. The compressive strength 19 is wrapped on the surface of the first water-resistant layer 18 by 360 degrees by using a round thin steel wire, and the action mechanism of the compressive strength is to enhance the compressive strength inside the comprehensive cable. The second fire-resistant layer 20 is wrapped on the surface of the compressive strength 19 by using a ceramic armored ceramic fireproof mica tape, the material does not extend and drip when vertically burning, and the fire resistance can reach VW-1 level; under the condition of 500 plus materials at 2300 ℃ with flame and without flame, the ceramic-shaped armor can be fired into a hard ceramic-shaped armor, the ceramic-shaped supporting armor after firing is harder when the temperature is higher and the ablation time is longer, the residue is a pure ceramic inorganic substance, the residue can reach more than 83 percent and does not fall off, the ceramic-shaped armor can play a good role in fire insulation, heat insulation, water retaining and vibration bearing, the ceramic-sheathed ceramic fireproof mica tape has high tensile strength, the bending fracture strength of the ablated armor can reach about 10MPa, and the ceramic-sheathed ceramic-shaped fireproof mica tape has excellent flexibility, electrical property and mechanical property and can be used for a long time in all weather at the temperature of minus 80-350 ℃; under the static condition, the maximum service temperature can reach more than 350-1500 ℃, and the structure forms a second fire-resistant structure of the integrated cable.

The first fire-resistant layer 21 is formed by extruding a ceramic halogen-free low-smoke polyolefin fire-resistant sheath material on the surface of the second fire-resistant layer 20, the material has a dielectric strength of more than or equal to 26MV/m and a volume resistivity of more than or equal to 2 multiplied by 1014 ohm.cm at the temperature, uniform ceramic micropores are generated on the section of the hard shell after ablation, the dielectric strength of a ceramic armor is more than 40KV/mm, the volume resistivity of the ceramic armor is more than 2 multiplied by 1018 ohm.m, the ceramic armor can be used as a sheath layer and a fire-resistant layer, the ceramic armor has the characteristics of the halogen-free low-smoke polyolefin fire-resistant sheath material at the temperature of-55 to 95 ℃, the sintered inorganic ceramic armor can resist the high temperature of 2000 ℃, the inorganic ceramic armor does not delay combustion and does not drip, the smoke toxicity reaches ZA1 level, the smoke density can reach more than 80 percent, the structure forms a first fire-resistant structure of the integrated cable, and a layer of the cross-linkable fire-resistant co-, the material has strong termite bite resistance and acid-base liquid corrosion resistance.

The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.