CN108597661B - Anti-fracture detection cable and manufacturing method thereof - Google Patents

Anti-fracture detection cable and manufacturing method thereof Download PDF

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Publication number
CN108597661B
CN108597661B CN201810337122.8A CN201810337122A CN108597661B CN 108597661 B CN108597661 B CN 108597661B CN 201810337122 A CN201810337122 A CN 201810337122A CN 108597661 B CN108597661 B CN 108597661B
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cavities
cable
sliding blocks
grooves
core wire
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CN108597661A (en
Inventor
董吟梅
刘芳
陆秀国
杨茂明
王友香
郭宗亚
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Anhui Hui Ning Electrical Instrument Group Co ltd
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Anhui Hui Ning Electrical Instrument Group Co ltd
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    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01BCABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B7/00Insulated conductors or cables characterised by their form
    • H01B7/17Protection against damage caused by external factors, e.g. sheaths or armouring
    • H01B7/18Protection against damage caused by wear, mechanical force or pressure; Sheaths; Armouring
    • H01B7/184Sheaths comprising grooves, ribs or other projections
    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01BCABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B13/00Apparatus or processes specially adapted for manufacturing conductors or cables
    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01BCABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B13/00Apparatus or processes specially adapted for manufacturing conductors or cables
    • H01B13/0006Apparatus or processes specially adapted for manufacturing conductors or cables for reducing the size of conductors or cables
    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01BCABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B13/00Apparatus or processes specially adapted for manufacturing conductors or cables
    • H01B13/0016Apparatus or processes specially adapted for manufacturing conductors or cables for heat treatment
    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01BCABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B13/00Apparatus or processes specially adapted for manufacturing conductors or cables
    • H01B13/22Sheathing; Armouring; Screening; Applying other protective layers
    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01BCABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B7/00Insulated conductors or cables characterised by their form
    • H01B7/0045Cable-harnesses
    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01BCABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B7/00Insulated conductors or cables characterised by their form
    • H01B7/0072Electrical cables comprising fluid supply conductors
    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01BCABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B7/00Insulated conductors or cables characterised by their form
    • H01B7/04Flexible cables, conductors, or cords, e.g. trailing cables
    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01BCABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B7/00Insulated conductors or cables characterised by their form
    • H01B7/17Protection against damage caused by external factors, e.g. sheaths or armouring
    • H01B7/18Protection against damage caused by wear, mechanical force or pressure; Sheaths; Armouring
    • H01B7/1805Protections not provided for in groups H01B7/182 - H01B7/26
    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01BCABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B7/00Insulated conductors or cables characterised by their form
    • H01B7/17Protection against damage caused by external factors, e.g. sheaths or armouring
    • H01B7/18Protection against damage caused by wear, mechanical force or pressure; Sheaths; Armouring
    • H01B7/1805Protections not provided for in groups H01B7/182 - H01B7/26
    • H01B7/1815Protections not provided for in groups H01B7/182 - H01B7/26 composed of longitudinal inserts
    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01BCABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B7/00Insulated conductors or cables characterised by their form
    • H01B7/17Protection against damage caused by external factors, e.g. sheaths or armouring
    • H01B7/18Protection against damage caused by wear, mechanical force or pressure; Sheaths; Armouring
    • H01B7/185Sheaths comprising internal cavities or channels

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  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Insulated Conductors (AREA)

Abstract

The invention discloses an anti-fracture detection cable and a manufacturing method thereof, and the anti-fracture detection cable comprises an air guide pipe, a signal core wire unit and a power supply core wire unit, wherein first cavities are arranged outside the signal core wire unit and the power supply core wire unit, a plurality of second cavities are correspondingly arranged inside the upper side wall and the lower side wall of each cavity, grooves are correspondingly arranged on the opposite sides of the two second cavities, a plurality of first sliding blocks are connected inside the two second cavities in a sliding manner, second sliding blocks are fixedly arranged on the opposite sides of the plurality of first sliding blocks respectively positioned in the two first cavities, one ends of the plurality of second sliding blocks, far away from the first sliding blocks, respectively penetrate through the two grooves and extend into the first cavities, and springs are respectively arranged between the plurality of second sliding blocks respectively positioned in the two second cavities. The invention can ensure that the detection cable has better flexibility, can prevent the detection cable from breaking and can better protect the detection cable.

Description

Anti-fracture detection cable and manufacturing method thereof
Technical Field
The invention relates to the technical field of cables, in particular to an anti-fracture detection cable and a manufacturing method thereof.
Background
Cable conductors are typically rope-like cables made by stranding several or groups of conductors (at least two in each group), each group being insulated from each other and often twisted around a center, the entire outer surface being coated with a highly insulating coating. The cable has the characteristics of internal electrification and external insulation. The cable includes power cable, control cable, compensation cable, shielding cable, high-temperature cable, computer cable, signal cable, coaxial cable, fire-resistant cable, marine cable, mining cable, aluminum alloy cable and the like. They are composed of single or multi-strand wires and insulating layers, and are used for connecting circuits, electric appliances and the like.
Through retrieval, the chinese patent with grant number CN105869744A discloses a detection cable and a manufacturing method thereof, comprising an air duct, a plurality of signal core wire units and power core wire units arranged at intervals around the air duct, a strapping tape wound outside the plurality of signal core wire units and power core wire units, and an outer sleeve sleeved outside the strapping tape, the outer sleeve is sequentially provided with a fastening belt, a shielding belt and an outer protecting belt in a laminating way along the radius direction from the axis of the detection cable, two sides of the shielding belt are respectively bonded with the fastening belt and the outer protective belt, a flexible ball and a retainer are arranged between the strapping belt and the fastening belt, the flexible ball is arranged in the accommodating cavity of the retainer and can rotate in the accommodating cavity, the retainer is fixedly connected with the strapping tape, and the strapping tape and the outer sleeve realize relative movement along the axial direction of the detection cable under the action of the flexible ball. The anti-fracture characteristics of the detection cable in the above patent are poor, and the service life of the detection cable is affected when the detection cable is used for a long time. Therefore, the invention designs an anti-fracture detection cable and a manufacturing method thereof.
Disclosure of Invention
The invention aims to solve the problems that the detection cable in the prior art is poor in fracture resistance and the service life of the detection cable is influenced when the detection cable is used for a long time, and provides an anti-fracture detection cable and a manufacturing method thereof.
In order to achieve the purpose, the invention adopts the following technical scheme:
a breakage-proof detection cable and a manufacturing method thereof comprise an air duct, a signal core wire unit and a power core wire unit, wherein a first cavity is arranged outside the signal core wire unit and the power core wire unit, a plurality of second cavities are correspondingly arranged inside the upper side wall and the lower side wall of the cavity, grooves are correspondingly arranged on the opposite sides of the two second cavities, a plurality of first sliders are respectively connected inside the two second cavities in a sliding manner, second sliders are respectively fixedly arranged on the opposite sides of the plurality of first sliders in the two first cavities, one ends of the plurality of second sliders, far away from the first sliders, respectively penetrate through the two grooves and extend into the first cavities, springs are respectively arranged between the plurality of second sliders in the two second cavities, the two ends of each spring are respectively fixedly connected with the side walls of the two second sliders, arc-shaped placing grooves are respectively arranged on the opposite side walls of the plurality of second sliders in the two grooves, the inside of a plurality of arc standing grooves is equipped with cylindrical elastic strip.
Preferably, a heat dissipation layer is arranged outside the first cavity.
Preferably, an insulating layer is arranged outside the heat dissipation layer.
Preferably, the first sliding block, the second sliding block and the cylindrical elastic strip are made of insulating rubber.
Preferably, a plurality of the inner walls of the arc-shaped placing grooves are provided with nylon layers.
Preferably, the number of the second cavities and the grooves is at least 6.
A method of making a rupture prevention probe cable, including the method of any one of claims 1 to 6, comprising the steps of:
step 1: drawing copper and aluminum monofilaments. The common copper and aluminum rod material for wire and cable has reduced cross section, increased length and raised strength at normal temperature through one or several drawing dies.
Step 2: and (5) annealing the monofilaments. The copper and aluminum monofilaments are heated to a certain temperature, and the toughness of the monofilaments and the strength of the monofilaments are improved in a recrystallization mode so as to meet the requirements of wires and cables on conductive wire cores.
And step 3: and (5) twisting the conductor. In order to improve the flexibility of the electric wire and the electric cable and facilitate laying and installation, the conductive wire core is formed by twisting a plurality of single wires.
And 4, step 4: and (4) insulating and extruding. The plastic wire and cable mainly adopts a solid insulating layer which is extruded, and the main technical requirements of plastic insulation extrusion are as follows:
eccentricity is as follows: the deviation value of the extruded insulation thickness is an important mark reflecting the extrusion process level, and most product structure dimensions and the deviation value thereof are clearly specified in the standard. Smoothness: the surface of the extruded insulating layer is required to be smooth, and the problems of rough surface, scorching and poor quality of impurities cannot be caused. Density: the cross section of the extruded insulating layer needs to be compact and firm, and can not be provided with pinholes visible to the naked eye, so that the existence of air bubbles is avoided.
And 5: cabling is generally required to be twisted into a round shape for a multi-core cable in order to ensure the degree of formation and reduce the appearance of the cable. The twisting mechanism is similar to conductor twisting, and a non-back-twisting mode is mostly adopted due to the larger twisting pitch diameter. The technical requirements of cabling are as follows: firstly, the twisting of the cable caused by the turning over of the special-shaped insulated wire core is avoided; and secondly, the insulating layer is prevented from being scratched.
Step 6: an inner sheath layer. In order to protect the insulated wire core from being bruised by the armour, the insulation layer needs to be properly protected.
And 7: the detection cable can select an inner steel tape armoring structure.
And 8: and an outer sheath is sleeved on the outer part of the cable.
Compared with the prior art, the invention provides an anti-fracture detection cable and a manufacturing method thereof, and the anti-fracture detection cable has the following beneficial effects:
1. according to the anti-fracture detection cable and the manufacturing method thereof, through the springs arranged between the second sliders, when the detection cable is bent, the first sliders and the second sliders can move in the second cavities and the grooves respectively, and then the springs can be pulled by the second sliders mutually, so that the detection cable has good flexibility, and the phenomenon that the detection cable is fractured can be prevented.
2. According to the anti-fracture detection cable and the manufacturing method thereof, through the step 1, the strength of the cable can be improved, through the step 2, the strength of a monofilament can be reduced, meanwhile, the oxidation of a copper wire can be avoided through annealing, through the step 6, an insulation wire core can be protected from being bruised by armor, the insulation layer needs to be properly protected, through the step 7, the cable can bear certain positive pressure, and through the step 8, the insulation layer of the cable can be protected from a structural part corroded by environmental factors.
The invention can make the detecting cable have better flexibility, prevent the detecting cable from breaking, and protect the detecting cable better.
Drawings
Fig. 1 is a schematic structural diagram of an anti-fracture detection cable and a manufacturing method thereof according to the present invention;
FIG. 2 is a schematic structural view of part A of an anti-fracture cable and a method for manufacturing the same according to the present invention;
fig. 3 is a schematic structural diagram of a side view of an anti-fracture detection cable and a manufacturing method thereof according to the present invention.
In the figure: the device comprises an air duct 1, a signal core wire unit 2, a power core wire unit 3, a first cavity 4, a second cavity 5, a groove 6, a first slider 7, a second slider 8, an arc-shaped placing groove 9, a cylindrical elastic strip 10, a spring 11, a heat dissipation layer 12 and an insulating layer 13.
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.
In the description of the present invention, it is to be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention.
Referring to fig. 1-3, a breakage-proof detection cable comprises an air duct 1, a signal core wire unit 2 and a power core wire unit 3, wherein a first cavity 4 is arranged outside the signal core wire unit 2 and the power core wire unit 3, a heat dissipation layer 12 is arranged outside the first cavity 4 and can dissipate heat inside the cable, an insulating layer 13 is arranged outside the heat dissipation layer 12 and can better isolate electric wires inside the cable, a plurality of second cavities 5 are correspondingly arranged inside the upper side wall and the lower side wall of the cavity 4, at least 6 second cavities 5 and grooves 6 are arranged, grooves 6 are correspondingly arranged on opposite sides of the two second cavities 5, a plurality of first sliders 7 are slidably connected inside the two second cavities 5, second sliders 8 are fixedly arranged on opposite sides of the first sliders 7 respectively positioned in the two first cavities 5, the first sliders 7, the second sliders 8 and a cylindrical elastic strip 10 are made of insulating rubber, one end of each second slider 8, which is far away from the first slider 7, penetrates through the two grooves 6 and extends into the first cavity 4, springs 11 are arranged between the second sliders 8 respectively positioned in the two second cavities 5, two ends of each spring 11 are fixedly connected with the side walls of the two second sliders 8 respectively, the side walls, opposite to the second sliders 8, positioned in the two grooves 6 are provided with arc-shaped placing grooves 9, the inner walls of the arc-shaped placing grooves 9 are provided with nylon layers, cylindrical elastic strips 10 are arranged inside the arc-shaped placing grooves 9, the cylindrical elastic strips 10 can increase the flexibility of the cable, when the detection cable is bent, the first sliders 7 and the second sliders 8 can move in the second cavities 5 and the grooves 6 respectively, and further the second sliders 8 can mutually pull the springs 11, so that the detection cable has better flexibility, the phenomenon of breaking of the detection cable can be prevented.
A method of making a rupture prevention probe cable, including the method of any one of claims 1 to 6, comprising the steps of:
step 1: drawing copper and aluminum monofilaments. The common copper and aluminum rod material for wire and cable has reduced cross section, increased length and raised strength at normal temperature through one or several drawing dies.
Step 2: and (5) annealing the monofilaments. The copper and aluminum monofilaments are heated to a certain temperature, and the toughness of the monofilaments and the strength of the monofilaments are improved in a recrystallization mode so as to meet the requirements of wires and cables on conductive wire cores.
And step 3: and (5) twisting the conductor. In order to improve the flexibility of the electric wire and the electric cable and facilitate laying and installation, the conductive wire core is formed by twisting a plurality of single wires.
And 4, step 4: and (4) insulating and extruding. The plastic wire and cable mainly adopts a solid insulating layer which is extruded, and the main technical requirements of plastic insulation extrusion are as follows:
eccentricity is as follows: the deviation value of the extruded insulation thickness is an important mark reflecting the extrusion process level, and most product structure dimensions and the deviation value thereof are clearly specified in the standard. Smoothness: the surface of the extruded insulating layer is required to be smooth, and the problems of rough surface, scorching and poor quality of impurities cannot be caused. Density: the cross section of the extruded insulating layer needs to be compact and firm, and can not be provided with pinholes visible to the naked eye, so that the existence of air bubbles is avoided.
And 5: cabling is generally required to be twisted into a round shape for a multi-core cable in order to ensure the degree of formation and reduce the appearance of the cable. The twisting mechanism is similar to conductor twisting, and a non-back-twisting mode is mostly adopted due to the larger twisting pitch diameter. The technical requirements of cabling are as follows: firstly, the twisting of the cable caused by the turning over of the special-shaped insulated wire core is avoided; and secondly, the insulating layer is prevented from being scratched.
Step 6: an inner sheath layer. In order to protect the insulated wire core from being bruised by the armour, the insulation layer needs to be properly protected.
And 7: the detection cable can select an inner steel tape armoring structure.
And 8: and an outer sheath is sleeved on the outer part of the cable.
In the invention, when the detection cable is bent in use, the first slider 7 and the second slider 8 can respectively move in the second cavity 5 and the groove 6, and the plurality of second sliders 8 can mutually pull the spring 11, so that the detection cable has better flexibility and can prevent the detection cable from being broken, the strength of the cable can be improved through the step 1, the strength of a monofilament can be reduced through the step 2, meanwhile, the oxidation of a copper wire can be avoided through annealing, the insulated wire core can be protected from being bruised by armor through the step 6, the insulating layer needs to be properly protected, the cable can bear a certain positive pressure through the step 7, and the insulating layer of the cable can be protected from a structural part corroded by environmental factors through the step 8.
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.

Claims (1)

1. The anti-fracture detection cable comprises an air duct (1), a signal core wire unit (2) and a power core wire unit (3), and is characterized in that a first cavity (4) is arranged outside the signal core wire unit (2) and the power core wire unit (3), a plurality of second cavities (5) are correspondingly arranged on the upper side wall and the lower side wall of the first cavity (4), a groove (6) is correspondingly arranged on one opposite side of each of the two second cavities (5), a plurality of first sliding blocks (7) are respectively connected inside the two second cavities (5) in a sliding manner, a second sliding block (8) is fixedly arranged on one opposite side of each of the first sliding blocks (7) respectively positioned in the two second cavities (5), one ends, far away from the first sliding blocks (7), of the second sliding blocks (8) respectively penetrate through the two grooves (6) and extend into the first cavities (4), springs (11) are arranged between the second sliding blocks (8) respectively positioned in the two second cavities (5), two ends of each spring (11) are fixedly connected with the side walls of the two second sliding blocks (8), arc-shaped placing grooves (9) are formed in the side walls, opposite to the second sliding blocks (8), positioned in the two grooves (6), and cylindrical elastic strips (10) are arranged inside the arc-shaped placing grooves (9);
a heat dissipation layer (12) is arranged outside the first cavity (4);
an insulating layer (13) is arranged outside the heat dissipation layer (12);
the first sliding block (7), the second sliding block (8) and the cylindrical elastic strip (10) are made of insulating rubber;
the inner walls of the arc-shaped placing grooves (9) are provided with nylon layers;
the number of the second cavities (5) and the number of the grooves (6) are at least 6;
the manufacturing method comprises the following steps:
step 1: drawing copper and aluminum monofilaments, wherein the common copper and aluminum rods for wires and cables are reduced in section, increased in length and improved in strength at normal temperature by using a wire drawing machine through one or more die holes of a drawing die;
step 2: annealing the monofilaments, namely heating the copper and aluminum monofilaments to a certain temperature, and improving the toughness and reducing the strength of the monofilaments in a recrystallization mode so as to meet the requirements of wires and cables on conductive wire cores;
and step 3: the conductor is twisted, in order to improve the flexibility of the electric wire and the electric cable and facilitate laying and installation, the conductive wire core is formed by twisting a plurality of monofilaments;
and 4, step 4: extruding the plastic wire and cable in an insulating way, wherein the plastic wire and cable mainly adopts an extruded solid insulating layer;
and 5: detecting a cable to select an inner steel belt armored structure;
step 6: and an outer sheath is sleeved on the outer part of the cable.
CN201810337122.8A 2018-04-16 2018-04-16 Anti-fracture detection cable and manufacturing method thereof Active CN108597661B (en)

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CN108597661B true CN108597661B (en) 2021-05-11

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Publication number Priority date Publication date Assignee Title
CN109559845B (en) * 2019-01-14 2020-05-05 福建南新电缆有限公司 Wear-resisting anti-bending cable
CN110033896B (en) * 2019-05-13 2020-11-20 安徽省康利亚股份有限公司 Train is high temperature resistant cable for current collector
CN111083609B (en) * 2019-12-06 2021-11-26 歌尔股份有限公司 Voice coil wire, voice coil and sound production device for sound production device
CN111716676B (en) * 2020-06-19 2022-05-06 安徽渡江电缆集团有限公司 Auxiliary device for cable rubber extrusion continuous vulcanization process

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105869744A (en) * 2016-06-02 2016-08-17 天津朗兴电线电缆有限公司 Detection cable and manufacturing method thereof
CN206412116U (en) * 2016-12-20 2017-08-15 新疆峰岩线缆有限公司 A kind of environmental protection safety type fireproof cable
CN206574936U (en) * 2017-03-10 2017-10-20 中山市世纪飞翔电子有限公司 Novel high-strength data wire
CN107591223A (en) * 2017-08-30 2018-01-16 成都君华睿道科技有限公司 A kind of high performance cable for Aero-Space
CN206991800U (en) * 2017-05-23 2018-02-09 刘辉 A kind of good high-tension cable of pliability
CN207134161U (en) * 2017-09-07 2018-03-23 余姚市捷飞电器有限公司 A kind of fire safe type environment-friendly cable

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105869744A (en) * 2016-06-02 2016-08-17 天津朗兴电线电缆有限公司 Detection cable and manufacturing method thereof
CN206412116U (en) * 2016-12-20 2017-08-15 新疆峰岩线缆有限公司 A kind of environmental protection safety type fireproof cable
CN206574936U (en) * 2017-03-10 2017-10-20 中山市世纪飞翔电子有限公司 Novel high-strength data wire
CN206991800U (en) * 2017-05-23 2018-02-09 刘辉 A kind of good high-tension cable of pliability
CN107591223A (en) * 2017-08-30 2018-01-16 成都君华睿道科技有限公司 A kind of high performance cable for Aero-Space
CN207134161U (en) * 2017-09-07 2018-03-23 余姚市捷飞电器有限公司 A kind of fire safe type environment-friendly cable

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