KR20110131476A - Manufacturing method of ignition cable for vehicle and the manufactured ignition cable - Google Patents

Manufacturing method of ignition cable for vehicle and the manufactured ignition cable Download PDF

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Publication number
KR20110131476A
KR20110131476A KR1020100050929A KR20100050929A KR20110131476A KR 20110131476 A KR20110131476 A KR 20110131476A KR 1020100050929 A KR1020100050929 A KR 1020100050929A KR 20100050929 A KR20100050929 A KR 20100050929A KR 20110131476 A KR20110131476 A KR 20110131476A
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South Korea
Prior art keywords
conductor
fiber
ignition cable
circumferential surface
vehicle
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KR1020100050929A
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Korean (ko)
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KR101173581B1 (en
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성훈용
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성훈용
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Publication of KR101173581B1 publication Critical patent/KR101173581B1/en

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B13/00—Apparatus or processes specially adapted for manufacturing conductors or cables
    • H01B13/0016—Apparatus or processes specially adapted for manufacturing conductors or cables for heat treatment
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B13/00—Apparatus or processes specially adapted for manufacturing conductors or cables
    • H01B13/06—Insulating conductors or cables
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B13/00—Apparatus or processes specially adapted for manufacturing conductors or cables
    • H01B13/22—Sheathing; Armouring; Screening; Applying other protective layers
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B13/00—Apparatus or processes specially adapted for manufacturing conductors or cables
    • H01B13/32—Filling or coating with impervious material
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B3/00—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties
    • H01B3/18—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances
    • H01B3/30—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances plastics; resins; waxes
    • H01B3/46—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances plastics; resins; waxes silicones
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B3/00—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties
    • H01B3/18—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances
    • H01B3/30—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances plastics; resins; waxes
    • H01B3/47—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances plastics; resins; waxes fibre-reinforced plastics, e.g. glass-reinforced plastics
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B7/00—Insulated conductors or cables characterised by their form
    • H01B7/0063—Ignition cables

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  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Physics & Mathematics (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • Insulated Conductors (AREA)
  • Ignition Installations For Internal Combustion Engines (AREA)
  • Thermal Sciences (AREA)

Abstract

PURPOSE: An ignition cable for vehicles is provided to absorb and eliminate high frequency noise, improve engine power of vehicles, assure stability by maintaining uniform adhesive state between a resistance conductor and insulator when wiring working. CONSTITUTION: A manufacturing method of ignition cable for vehicles(100) comprises: a step of manufacturing fiber aggregate as internal conductor(112) by throwing one selected from 600-1000d denier glass fiber, yarn, aramid fiber, and polyester fiber; and a step of manufacturing resistance(110) conductor by forming external conductor(114) on the external surface of the internal conductor by the extrusion of conductive compound; and a step of coating insulator(120) on the external surface of the resistance conductor.

Description

Manufacturing method of vehicle ignition cable and ignition cable manufactured by the method {manufacturing method of Ignition cable for vehicle and the manufactured Ignition cable}

The present invention relates to a method for manufacturing a vehicle ignition cable and to an ignition cable manufactured by the method. More particularly, the high voltage generated from the ignition coil located between the vehicle battery of an automobile or the like and the spark plug of the engine is a distributor ( Method for manufacturing a vehicle ignition cable that can prevent the occurrence of high-frequency noise (e.g., various electrical devices) provided in the vehicle when the cable is delivered to the spark plug via a distributor and an ignition cable manufactured by the same method It is about.

In general, a vehicle ignition cable is a cable that transmits a high voltage signal of about 20,000V generated from an ignition coil to a distributor (distributor) and a spark plug.

On the other hand, in recent years, the vehicle is equipped with a number of equipment such as audio, TV, navigation, other communication equipment and electronic control device.

However, during engine ignition of a vehicle, high-frequency noise generated when a high voltage of 20,000 V or more generated by the ignition coil located between the battery and the ignition plug of the engine comes into contact with the ignition plug through a distributor is used. It causes noise or malfunction of communication equipment and electronic control devices. In particular, in the case of automobiles, electronics and automation may cause fatal consequences such as injury or fire due to malfunction of electronic control devices.

Meanwhile, the conventional ignition cable for a vehicle has a structure in which an insulator surrounds a resistance conductor located at a center and the resistance conductor, and in general, due to a non-uniform relationship between the resistance conductor and the insulating rubber, In the case of cutting one end, the phenomenon that the resistance conductor is separated and separated from the insulator easily occurs, and there is a problem that a poor contact with the terminal (terminal) may occur during wiring.

Accordingly, the present invention is to solve these problems, the purpose of which is to remove the high-frequency noise that causes noise or malfunction of the radio and other communication equipment and electronic control device of the vehicle, as well as located in the center The present invention provides a method of manufacturing a vehicle ignition cable that can ensure stability even during wiring work by maintaining a uniform adhesive state between the resistance conductor and the insulator surrounding the resistance conductor, and an ignition cable manufactured by the same method.

The present invention to solve this technical problem;

A first step of collectively twisting any one of glass fibers, yarns, aramid fibers, and polyester fibers to produce fiber aggregate yarns as inner conductors; A second step of forming an outer conductor by extruding a conductive compound on an outer surface of the inner conductor to form an outer conductor; And a third step of coating the insulator on the outer circumferential surface of the resistance conductor.

In this case, the fiber set yarn is characterized in that the collective twist of any one of 600 ~ 1,000 denier glass fiber (yarn), yarn (yarn) aramid fiber (polyamide), polyester (Polyester) fiber in three combinations. .

In addition, the conductive compound; 100PHR (Part per Hundred Resin) of any one of EPDM, synthetic resin mixture, and silicone rubber, conductive carbon black 70PHR, stabilizer 5.0PHR, reinforcement 10PHR, hardener 3.0PHR, other additives 5.0 It is characterized in that the mixture is prepared by the ratio of PHR.

In the second process, the conductive compound is extruded on the aggregated twisted fiber yarn with an outer diameter of 0.8 to 2.0 mm of the resistance conductor to be vulcanized in a direct vulcanizing tube at a temperature range of 190 to 210 ° C. to form an outer conductor. It is characterized by.

In addition, the fourth step of forming a reinforcing material wrapped with a glass braid (Glass Braid) to reinforce the outer circumferential surface of the insulator, and the rubber compound extruded by a rubber molding extruder on the outer circumferential surface of the reinforcing material to cover the outer skin; It is characterized by including.

On the other hand, the present invention; A first step of collectively twisting any one of glass fiber, yarn aramid fiber, and polyester fiber to manufacture fiber aggregate twisted yarn as an inner conductor; A second step of forming a magnetic core on an outer surface of the inner conductor and winding a conductive wire on an outer circumferential surface of the magnetic core; Also provided is a third step of coating an insulator on an outer circumferential surface of the resistance conductor.

At this time, the magnetic core is mixed with heat-resistant silicone rubber (2.5 ~ 3.5gr) and ferrite (Ferrite) synthetic powder (6.5 ~ 7.5gr) to make EMI electromagnetic shielding compound and extruded to a rubber molding extruder with an outer diameter of 1.8 ~ 2.3mm It is characterized by being vulcanized and formed.

In addition, the conductive wire has a diameter of 0.07 ~ 0.08mm and consists of 1.6 ~ 1.8Ω / ㎝ stainless steel wire, the stainless steel wire is wound around 45 ~ 55 times / ㎝ on the outer peripheral surface of the magnetic core It is done.

The present invention also provides an ignition cable for a vehicle, which is produced by the above methods.

And a resistance conductor provided in the center, an insulator coated on the outer circumferential surface of the resistance conductor, a reinforcing material surrounding the outer circumferential surface of the insulator, and an outer sheath coated on the outer circumferential surface of the reinforcing material.

Here, the resistance conductor is characterized in that it consists of an inner conductor consisting of a fiber-set twisted yarn in the center, and an outer conductor formed by extruding a conductive compound on the outer peripheral surface of the inner conductor.

In addition, the resistance conductor is characterized in that it consists of an inner conductor consisting of fiber-twisted yarn in the center, a magnetic core formed on the outer surface of the inner conductor, and a conductive wire wound on the outer circumferential surface of the magnetic core.

The vehicle ignition cable manufactured by the manufacturing method according to the present invention not only absorbs and removes high frequency noise, but also greatly reduces the resistance value of the resistance conductor, thereby improving the engine output of the vehicle and completely burning the fuel in the cylinder to cause environmental pollution. In addition, the resistance conductor located in the center and the insulator surrounding the resistance conductor maintain a uniform adhesive state to ensure stability during wiring.

1 is a perspective view illustrating the structure of a vehicle ignition cable according to an embodiment of the present invention.
2 is a cross-sectional view for explaining the structure of a vehicle ignition cable according to an embodiment of the present invention.
3 is a view illustrating a structure of a vehicle ignition cable according to another embodiment of the present invention.

Hereinafter, a method for manufacturing a vehicle ignition cable according to the present invention and a ignition cable manufactured by the method will be described in detail with reference to the accompanying drawings.

1 and 2, the vehicle ignition cable 100 according to an embodiment of the present invention has a resistance conductor 110 is provided in the center and the heat resistance and insulation that is coated on the outer peripheral surface of the resistance conductor 110 It consists of an insulator 120, a reinforcing material 130 surrounding the outer circumferential surface of the insulator 120 and reinforcing strength, and an outer shell 140 coated on the outer circumferential surface of the reinforcing material 130.

In this case, the resistance conductor 110 is composed of an inner conductor 112 made of fiber-twisted yarn in the center, and an outer conductor 114 formed by extruding a conductive compound on the outer circumferential surface of the inner conductor 112.

Hereinafter, a manufacturing process of a vehicle ignition cable according to an embodiment of the present invention will be described.

At this time, the vehicle ignition cable is divided into a process of manufacturing the resistance conductor 110, and forming the insulator 120 and the outer shell 140.

First, the resistance conductor 110 is a manufacturing process of the inner conductor 112 made of fiber-set twisted yarn provided at the center, and the outer conductor 1140 of the outer conductor 1140 formed by extruding the conductive compound on the outer surface of the inner conductor 112. It is produced by performing the forming process.

The inner conductor 112 uses any one of glass fiber, yarn aramid fiber, and polyester fiber, which are highly resistant to mechanical strength, tensile strength, vibration, and the like. It is produced by collectively twisting ~ 1,000 Denia (De ') into 3 sets. Such inner conductor 112 is a collective twisted fiber yarn of 1,800 ~ 3,000 denier.

Meanwhile, the conductive compound is manufactured to form the outer conductor 114 which integrally surrounds the outer circumferential surface of the inner conductor 112.

The conductive compound for forming the outer conductor 114 is any one of rubber material 100PHR (EPDM), synthetic resin mixture or silicone rubber (EPDM), which has excellent ozone resistance, weather resistance and chemical resistance. Part per Hundred Resin), conductive carbon black 70PHR, stabilizer 5.0PHR, reinforcing agent 10PHR, curing agent 3.0PHR, and other additives 5.0PHR. At this time, the conductive compound has a volume resistivity of 50 ~ 90 Ω / ㎠.

The above-mentioned conductive compound is extruded on the collective twisted fiber yarn, which is the inner conductor 112, with an outer diameter of 0.8 to 2.0 mm of the resistance conductor, and vulcanized in a direct vulcanizing tube at a temperature range of 190 to 210 ° C. to form an outer conductor 114. By doing so, the resistance conductor 110 in which the inner conductor 112 and the outer conductor 114 are integrated is manufactured.

On the other hand, when the outer conductor 114 is to be formed on the outer surface of the inner conductor 112, a conductive twisted yarn of 1,800 to 3,000 denier as the inner conductor 112 is formed by dissolving a conductive compound in an organic solvent. The impregnated coating may be manufactured to have an outer diameter of 0.8 to 2.0 mm, and vulcanized and dried in a heating tube (electric furnace) of 100 ° C. to 200 ° C. to manufacture the resistance conductor 110.

As described above, after the resistance conductor 110 is manufactured by integrating the inner conductor 112 and the outer conductor 114, the insulation 120 is coated on the outer circumferential surface of the resistance conductor 110 to ensure heat resistance and insulation.

At this time, the insulator 120 is made of heat-resistant silicone rubber or EPDM rubber as a main raw material to produce a rubber compound having excellent electrical and mechanical properties such as weather resistance, tracking resistance, and arc resistance, and extruded with a rubber molding extruder to have an overall outer diameter of 3.5. By extruding the insulator 120 to ˜4.5mm it is vulcanized in a direct vulcanization continuous vulcanization apparatus to form a cooling.

In addition, the reinforcing member 130 is formed on the outer circumferential surface of the insulator 120 by wrapping it with a glass braid.

Next, the rubber compound using heat-resistant silicone rubber or EPDM sheath (Jachet) of the same material as the insulator 120 is extruded with a rubber molding extruder so that the entire ignition cable has an outer diameter of 7.0 to 8.0 mm and vulcanized with a continuous direct vulcanizer. By coating the outer shell 140 on the outer peripheral surface of the reinforcing material 130.

On the other hand, Figure 3 is a view showing a vehicle ignition cable according to another embodiment of the present invention, the vehicle ignition cable 100 is an insulator 120, the reinforcing material 130, the shell 140 of the configuration of Figure 1 and Figure Same as the embodiment 2, the manufacturing method of the resistance conductor 110 provided in the center is different.

In this case, the resistance conductor 110 is made of a winding type, the inner conductor 112 made of fiber-set yarns in the center, the magnetic core 116 formed on the outer surface of the inner conductor 112, and the magnetic The conductive wire 118 is wound around the outer circumferential surface of the core 116.

The inner conductor 112 uses any one of glass fiber, yarn aramid fiber, and polyester fiber, which are highly resistant to mechanical strength, tensile strength, vibration, and the like. It is 1,800 ~ 3,000 denier twisted yarns produced by collectively twisting ~ 1,000 deniers (De ') into 3 sets.

On the other hand, the magnetic core 116 surrounding the outside of the inner conductor 112 is mixed with heat-resistant silicone rubber (2.5 ~ 3.5gr) and ferrite (Ferrite) synthetic powder (6.5 ~ 7.5gr) to create a EMI electromagnetic wave blocking compound It is formed by molding extrusion vulcanization with a rubber molding extruder with an outer diameter of 1.8 ~ 2.3mm. At this time, it is preferable to mix and knead the curing agent at a ratio of 1.2 PHR with respect to the EMI shielding compound 100PHR.

The conductive wire 118 wound on the outer circumferential surface of the magnetic core 116 has a diameter of 0.07 to 0.08 mm and is a stainless steel wire of 1.6 to 1.8 mW / cm as a winding machine (not shown). Winding at 45 ~ 55 times / ㎝ to produce a resistance conductor 110 having a resistance value of 4.5 ~ 6.7 ㏀ / ㎝.

Of course, preferably, the stainless steel wire has a diameter of 0.075 mm and a resistance of 1.7 kV / cm, and wound the stainless steel wire 50 times per cm on the surface of the magnetic core 116. Lower the resistance to 5.6 mA / cm.

Of course, after the resistance conductor 110 is formed, a series of processes for manufacturing the vehicle ignition cable 100 by forming the insulator 120, the reinforcement 130 and the outer shell 140 on the outer peripheral surface of the resistance conductor 110 Since is substantially the same as the manufacturing process of the ignition cable shown in FIG. 1 described above, description thereof will be omitted.

The test report (heat resistant silicone rubber) of the vehicle ignition cable according to the present invention shown in Figures 1 to 3 are shown in Table 1 below. That is, it can be seen that the resistance value of the resistance conductor is within the standard value, and in various tests such as withstand voltage and heat resistance, the result is within or without the standard value.

Inspection items Standard Found Conductor resistance 5.5㏀ / M ± 20% 5.5㏀ Withstand voltage 3.5 ㏀ / 30 minutes 23 ± 5 ℃ No salt solution 5.0% / 4 hours or more Heat resistance 200 ℃ / 168H No defect after leaving Tensile force 1200mm / 5min weight of 250N Withstand more than 5.0 minutes Cold resistance -50 ℃ / 4H No deformation Oil resistance Battery brake fluid / 48 hours Within 10% of cable change rate Bendability 180 ° C angle / 5000 times clear torsion Torque 29NM clear

Although the preferred embodiments of the present invention have been described above, the scope of the present invention is not limited thereto, and the scope of the present invention extends to the scope of the present invention to be substantially equivalent to the embodiments of the present invention. Various modifications can be made by those skilled in the art without departing from the scope of the present invention.

100: vehicle ignition cable 110: resistance conductor
112: inner conductor 114: outer conductor
116: magnetic core 118: conductive wire
120: insulator 130: reinforcing material
140: sheath

Claims (12)

A first step of collectively twisting any one of glass fibers, yarns, aramid fibers, and polyester fibers to produce fiber aggregate yarns as inner conductors;
A second step of forming an outer conductor by extruding a conductive compound on an outer surface of the inner conductor to form an outer conductor;
And a third step of covering the insulator on the outer circumferential surface of the resistive conductor.
The method of claim 1,
The fiber aggregate yarn is a vehicle ignition, characterized in that the collective twist of any one of 600 ~ 1,000 denier glass fiber (yarn), yarn (yarn) aramid fiber (polyamide), polyester (Polyester) fiber in three combinations Method of manufacturing the cable.
The method of claim 1, wherein the conductive compound;
100PHR (Part per Hundred Resin) of any one of EPDM, synthetic rubber mixture, and silicone rubber, conductive carbon black 70PHR, stabilizer 5.0PHR, reinforcement 10PHR, hardener 3.0PHR, other additives 5.0 Method for producing a ignition cable for a vehicle, characterized in that the mixture at the ratio of PHR.
The method of claim 1,
In the second step, the conductive compound is extruded on the collective twisted fiber yarn with an outer diameter of 0.8 to 2.0 mm of the resistance conductor to vulcanize in a direct vulcanizing tube at a temperature range of 190 to 210 ° C. to form an outer conductor. Method for manufacturing a vehicle ignition cable.
The method of claim 1,
A fourth step of forming a reinforcing material wrapped with a glass braid to reinforce the outer circumferential surface of the insulator, and extruding the rubber compound on the outer circumferential surface of the reinforcing material with a rubber molding extruder to cover the outer cover; Method for manufacturing a vehicle ignition cable, characterized in that.
A first step of collectively twisting any one of glass fiber, yarn aramid fiber, and polyester fiber to manufacture fiber aggregate twisted yarn as an inner conductor;
A second step of forming a magnetic core on an outer surface of the inner conductor and winding a conductive wire on an outer circumferential surface of the magnetic core;
And a third step of covering the insulator on the outer circumferential surface of the resistive conductor.
The method of claim 6,
The magnetic core is made by mixing heat-resistant silicone rubber (2.5 ~ 3.5gr) and ferrite synthetic powder (6.5 ~ 7.5gr) to make EMI electromagnetic shielding compound and vulcanized by extrusion molding rubber molding extruder with an outer diameter of 1.8 ~ 2.3mm Method for producing a vehicle ignition cable, characterized in that formed.
The method of claim 6,
The conductive wire has a diameter of 0.07 ~ 0.08mm and is made of 1.6 ~ 1.8Ω / ㎝ stainless steel wire, the stainless steel wire is characterized in that wound around 45 ~ 55 times / ㎝ on the outer peripheral surface of the magnetic core Method for manufacturing a vehicle ignition cable.
An ignition cable for a vehicle, which is manufactured according to any one of claims 1 to 8.
An ignition cable for a vehicle comprising a resistance conductor provided in the center, an insulator coated on the outer circumferential surface of the resistance conductor, a reinforcing material surrounding the outer circumferential surface of the insulator, and an outer sheath coated on the outer circumferential surface of the reinforcing material.
The vehicle ignition cable according to claim 10, wherein the resistance conductor comprises an inner conductor made of fiber-bonded twisted yarns in the center, and an outer conductor formed by extruding a conductive compound on the outer circumferential surface of the inner conductor.
11. The vehicle according to claim 10, wherein the resistance conductor comprises an inner conductor composed of fiber-twisted yarns in the center, a magnetic core formed on an outer surface of the inner conductor, and a conductive wire wound on an outer circumferential surface of the magnetic core. Ignition cable.
KR20100050929A 2010-05-31 2010-05-31 manufacturing method of Ignition cable for vehicle and the manufactured Ignition cable KR101173581B1 (en)

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KR20100050929A KR101173581B1 (en) 2010-05-31 2010-05-31 manufacturing method of Ignition cable for vehicle and the manufactured Ignition cable

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Application Number Priority Date Filing Date Title
KR20100050929A KR101173581B1 (en) 2010-05-31 2010-05-31 manufacturing method of Ignition cable for vehicle and the manufactured Ignition cable

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KR20110131476A true KR20110131476A (en) 2011-12-07
KR101173581B1 KR101173581B1 (en) 2012-08-14

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN116606553A (en) * 2023-05-16 2023-08-18 广东新荔湾电缆有限公司 Ceramic insulating material for fire-resistant cable and preparation method and application thereof
CN116978622A (en) * 2023-08-24 2023-10-31 河北永上电缆集团有限公司 Medium-voltage environment-friendly flame-retardant fireproof cable

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5034719A (en) 1989-04-04 1991-07-23 Prestolite Wire Corporation Radio frequency interference suppression ignition cable having a semiconductive polyolefin conductive core

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN116606553A (en) * 2023-05-16 2023-08-18 广东新荔湾电缆有限公司 Ceramic insulating material for fire-resistant cable and preparation method and application thereof
CN116978622A (en) * 2023-08-24 2023-10-31 河北永上电缆集团有限公司 Medium-voltage environment-friendly flame-retardant fireproof cable
CN116978622B (en) * 2023-08-24 2023-12-26 河北永上电缆集团有限公司 Medium-voltage environment-friendly flame-retardant fireproof cable

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