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CN-122025258-A - High-flexibility high-fire-resistance composite sheath cable and manufacturing method thereof

CN122025258ACN 122025258 ACN122025258 ACN 122025258ACN-122025258-A

Abstract

The invention belongs to the technical field of cables, and particularly relates to a high-flexibility high-fire-resistance composite sheath cable and a manufacturing method thereof. The composite sheath cable comprises a conductor, wherein an insulating layer is extruded outside the conductor, the conductor extruded with the insulating layer is formed into a cable core in a 0+6 structure, a core filling is filled in a central layer of the cable core, an inner sheath is extruded on the outer layer of the cable core, a fire-resistant shielding layer is wrapped on the outer layer of the inner sheath, and a composite outer sheath is arranged on the outer layer of the fire-resistant shielding layer. The cable overcomes the defect that the cable in the prior art is difficult to have high flexibility and high fire resistance at the same time through innovative layered structure and material design, has novel structure and can still maintain circuit integrity and fire resistance under severe mechanical stress, and is suitable for special occasions with high vibration, frequent bending and extremely high requirements on fire resistance, such as a robot drag chain, an offshore oil platform and internal wiring of automatic equipment.

Inventors

  • DING ZHAOYAN
  • TAN BO
  • WU SHENG
  • SONG YE
  • WEI XING
  • ZHOU WENHAO
  • Lv Zhuocheng
  • LIU HAOJIE
  • SHI XUAN
  • HAN MENGGANG
  • XU JINGYA
  • TANG HAIWEI
  • CHU FENGFENG
  • JIANG CHANGHAI
  • TANG LEI
  • XU HAIMIN
  • WANG XINGHONG
  • HU SHUXIONG
  • LI CHONG

Assignees

  • 江苏中煤电缆有限公司

Dates

Publication Date
20260512
Application Date
20260317

Claims (10)

  1. 1. The utility model provides a high-flexibility high fire-resistant composite sheath cable, its characterized in that, including conductor (1), conductor (1) crowded package insulating layer (2) outward, crowded package has conductor (1) of insulating layer (2) become the cable core with the structure cabling of 0+6, the central layer of cable core is filled with and fills out core (3), the outer crowded package of cable core has inner sheath (4), the outer package of inner sheath (4) has fire-resistant shielding layer (5), the outer layer of fire-resistant shielding layer (5) is provided with composite oversheath (6).
  2. 2. The high-flexibility high-fire-resistance composite sheath cable according to claim 1, characterized in that the conductor (1) is formed by twisting the bundle group according to a 1+6 structure, the twisting pitch being 10-12 times the outer diameter of the twisting; The bundle twisting group is formed by twisting a plurality of single filaments, and the bundle twisting pitch is 16-18 times of the bundle twisting outer diameter.
  3. 3. The high-flexibility high-fire-resistance composite sheath cable according to claim 1, wherein the fire-resistance shielding layer (5) is formed by overlapping and wrapping a ceramic silicon rubber belt; The width of the ceramic silicon rubber belt is 20-30mm, and the width of the overlapped lapping cover is 4.0-6.0mm.
  4. 4. The high flexibility high fire resistant composite sheath cable according to claim 1, wherein the composite outer sheath (6) comprises an inner layer and an outer layer; the inner layer is a fireproof shielding layer, the fireproof shielding layer comprises a weaving layer and a fireproof coating, the weaving layer is formed by weaving aramid fibers, and the fireproof coating is formed by curing an intumescent fireproof coating; The outer layer is a polyurethane elastomer layer.
  5. 5. The preparation method of the high-flexibility high-fire-resistance composite sheath cable is characterized by comprising the following steps of: Step S1, conductor manufacturing Bundle twisting, namely adopting a plurality of monofilaments to carry out bundle twisting to form a bundle twisting group, wherein the bundle twisting pitch is 16-18 times of the outer diameter of the bundle twisted group; The double twisting, namely 7 groups of bundle twisting groups are adopted to carry out double twisting according to a twisting structure of 1+6 to form a conductor (1), the double twisting direction is the same as the bundle twisting direction, the double twisting pitch is 10-12 times of the outer diameter after double twisting, Step S2, insulation extrusion Extruding polyvinyl chloride outside the conductor (1) by adopting a 50-type extruder to form an insulating layer (2), controlling the linear speed to be 10-15 m/min, and combining sectional air cooling and water cooling for outlet cooling; Step S3, cabling stranding Twisting the conductor (1) extruded with the insulating layer (2) into a cable core by adopting a 0+6 structure, wherein the cable forming direction is opposite to the twisting direction, the central layer of the cable core is filled by adopting a filling core (3), and the linear speed is controlled to be 5-8 m/min; Step S4, extruding an inner sheath The outer layer of the cable core is extruded with elastomer sheath material by adopting a 70-type extruder to form an inner sheath (4), the linear speed is controlled to be 5-8 m/min, and the wire outlet cooling is combined by adopting sectional air cooling and water cooling; Step S5, wrapping the fireproof shielding layer The outer layer of the inner sheath (4) is overlapped and wrapped by adopting a ceramic silicon rubber belt to form a fire-resistant shielding layer (5), and the linear speed is controlled to be 5-8 m/min; S6, forming a composite outer sheath Sequentially forming an inner layer and an outer layer of a composite outer sheath (6) on the outer layer of the refractory shielding layer (5); the inner layer is a fire-resistant shielding layer, the fire-resistant shielding layer comprises a weaving layer and a fire-resistant coating, the inner layer is formed by weaving aramid fibers by adopting a 24-spindle weaving machine, the weaving density is controlled to be 60-62%, and the weaving angle is controlled to be 40-60 degrees; Then coating liquid expansion fireproof paint on the weaving layer, forming a fireproof coating after drying and curing, and adopting a production line for drying and coiling while coating the fireproof coating, wherein the drying temperature is 70+/-2 ℃ and the production line speed is 1-1.5 m/min; And extruding polyurethane from the inner layer and the outer layer by adopting a 90-degree extruder to form the outer layer.
  6. 6. The method for producing a highly flexible and highly fire resistant composite jacketed cable according to claim 5, wherein in step S2, the temperature of the type 50 extruder is set such that the body 1 region is 160±10 ℃, the body 2 region is 170±10 ℃, the body 3 region is 180±10 ℃, the body 4 region is 185±10 ℃, the body 5 region is 185±10 ℃, the flange is 180±10 ℃, the die 1:175±10 ℃, the die 2:175±10 ℃, and the die 3:170±10 ℃.
  7. 7. The method for preparing the high-flexibility high-fire-resistance composite sheath cable according to claim 5, wherein in the step S2, the die is made of carbon structural steel during insulation extrusion, the surface of the die is subjected to chromium plating treatment, the die core size of the die is the outside diameter of a conductor plus 0.3mm, and the die sleeve size of the die is the outside diameter of insulation control plus 0.1mm.
  8. 8. The method for preparing the high-flexibility high-fire-resistance composite sheath cable according to claim 5, wherein in the step S3, a tungsten steel die with a smooth inner wall is adopted as a cabling die, and the die size is 0.97mm in calculated twisting outer diameter.
  9. 9. The method for producing a highly flexible highly fire resistant composite jacketed cable according to claim 5, wherein in step S4, the temperature of the 70-type extruder is set to 140±10 ℃ in the body 1 region, 145±10 ℃ in the body 2 region, 150±10 ℃ in the body 3 region, 155±10 ℃ in the body 4 region, 155±10 ℃ in the body 5 region, 160±10 ℃ in the flange, 155±10 ℃ in the die 1, 155±10 ℃ in the die 2, 155±10 ℃ in the die 3:150±10 ℃; the extrusion die adopts carbon structural steel, the surface of the extrusion die adopts chromium plating treatment, and the size of the extrusion die is that the outer diameter of the extruded extrusion die is-0.05 mm.
  10. 10. The method for manufacturing a high-flexibility high-fire-resistance composite sheath cable according to claim 5, wherein in step S6, the temperature of the 90-type extruder is set such that a body 1 zone is 150±10 ℃, a body 2 zone is 160±10 ℃, a body 3 zone is 170±10 ℃, a body 4 zone is 180±10 ℃, a flange is 180±10 ℃, a die 1:190±10 ℃, a die 2:200±10 ℃ and a die 3:210±10 ℃; The outer layer extrusion die is made of carbon structural steel, the surface of the outer layer extrusion die is treated by chromium plating, the die core size of the die is that the outer diameter of the die is +0.3mm before extrusion, and the die sleeve size of the die is that the outer diameter of the die is +0.1mm after extrusion.

Description

High-flexibility high-fire-resistance composite sheath cable and manufacturing method thereof Technical Field The invention belongs to the technical field of cables, and particularly relates to a high-flexibility high-fire-resistance composite sheath cable and a manufacturing method thereof. Background Conventional fire resistant cables typically use mica tape as the fire resistant layer and high flexible cables typically use high quality elastomers as the jacket. The traditional fire-resistant cable mica tape is crisp and hard in texture, is easy to pulverize and fall off under frequent dynamic bending, leads to fire-resistant performance failure, and seriously affects the softness and service life of the cable. The conventional high-flexibility cable adopts high-quality elastomer sheaths such as TPU, PUR and the like, has good flexibility, but has limited flame retardant grade, and is difficult to meet the fire-resistant standard of higher grade. Disclosure of Invention The invention aims to overcome the defects in the prior art and provide a high-flexibility high-fire-resistance composite sheath cable and a manufacturing method thereof. The cable overcomes the defect that the cable in the prior art is difficult to have high flexibility and high fire resistance at the same time through innovative layered structure and material design, has novel structure and can still maintain circuit integrity and fire resistance under severe mechanical stress, and is suitable for special occasions (such as a robot drag chain, an offshore oil platform and internal wiring of automatic equipment) with high vibration, frequent bending and extremely high requirements on fire resistance. In order to achieve the technical purpose, the technical scheme adopted by the embodiment of the invention is as follows: In a first aspect, an embodiment of the present invention provides a high-flexibility and high-fire-resistance composite sheath cable, including a conductor, wherein an insulation layer is extruded outside the conductor, the conductor extruded with the insulation layer is cabled in a structure of 0+6 to form a cable core, a core layer of the cable core is filled with a filler, an inner sheath is extruded outside the cable core, a fire-resistant shielding layer is wrapped outside the inner sheath, and a composite outer sheath is arranged outside the fire-resistant shielding layer. Further, the conductor is formed by twisting the beam twisting groups according to a 1+6 structure, and the twisting pitch is 10-12 times of the outer diameter of the twisting; The bundle twisting group is formed by twisting a plurality of single filaments, and the bundle twisting pitch is 16-18 times of the bundle twisting outer diameter. Further, the fireproof shielding layer is formed by overlapping and wrapping a ceramic silicon rubber belt; The width of the ceramic silicon rubber belt is 20-30mm, and the width of the overlapped lapping cover is 4.0-6.0mm. Further, the composite outer sheath includes an inner layer and an outer layer; the inner layer is a fireproof shielding layer, the fireproof shielding layer comprises a weaving layer and a fireproof coating, the weaving layer is formed by weaving aramid fibers, and the fireproof coating is formed by curing an intumescent fireproof coating; The outer layer is a polyurethane elastomer layer. In a second aspect, the embodiment of the invention provides a preparation method of a high-flexibility high-fire-resistance composite sheath cable, which comprises the following steps: Step S1, conductor manufacturing Bundle twisting, namely adopting a plurality of monofilaments to carry out bundle twisting to form a bundle twisting group, wherein the bundle twisting pitch is 16-18 times of the outer diameter of the bundle twisted group; the double twisting, namely 7 groups of bundle twisting groups are adopted to carry out double twisting according to a twisting structure of 1+6 to form a conductor, the double twisting direction is the same as the bundle twisting direction, the double twisting pitch is 10-12 times of the outer diameter after double twisting, Step S2, insulation extrusion Extruding polyvinyl chloride outside the conductor by adopting a 50-type extruder to form an insulating layer, controlling the linear speed to be 10-15 m/min, and adopting sectional air cooling and water cooling for wire outlet cooling; Step S3, cabling stranding Twisting the conductor wrapped with the insulating layer into a cable by adopting a 0+6 structure to form a cable core, wherein the cable forming direction is opposite to the twisting direction, the central layer of the cable core is filled by adopting a core filling, and the linear speed is controlled to be 5-8 m/min; Step S4, extruding an inner sheath The outer layer of the cable core is extruded with elastomer sheath material by adopting a 70-type extruder to form an inner sheath, the linear speed is controlled to be 5-8 m/min, and the wire outlet cooling is