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CN-122025265-A - High-strength impact-resistant flame-retardant insulated cable and production process thereof

CN122025265ACN 122025265 ACN122025265 ACN 122025265ACN-122025265-A

Abstract

The invention discloses a high-strength impact-resistant flame-retardant insulated cable and a production process thereof, which relate to the field of cables and comprise a conductive wire core and an outer sheath, wherein the outer sheath is positioned at the outer side of the conductive wire core, the outside winding of conductive core has separate insulating fire-retardant area, and a plurality of conductive core and separate insulating fire-retardant area's outside parcel have fire-retardant sheath. According to the high-strength impact-resistant flame-retardant insulated cable and the production process thereof, the flame retardant grade, the tracking resistance and the insulation reliability of the cable are obviously improved by the synergistic effect, the interlayer binding force and the overall tensile strength are greatly enhanced, the unique hollow buffer sleeve structure can effectively absorb and disperse stress when external impact is applied, the internal wire core is protected, the active regulation and uniform heat dissipation of the temperature are realized, the current carrying capacity and the long-term operation safety of the cable are improved, the internal stress is effectively reduced, the cable outer sheath is more compact, wear-resistant and cracking-resistant, and the service life is prolonged.

Inventors

  • Zhou Hengjian
  • HE CHAO
  • HE ZHONGBING

Assignees

  • 安徽齐宝电线电缆有限公司

Dates

Publication Date
20260512
Application Date
20260313

Claims (10)

  1. 1. The high-strength impact-resistant flame-retardant insulated cable comprises a conductive wire core (1) and an outer jacket (7), wherein the outer jacket (7) is positioned on the outer side of the conductive wire core (1), and is characterized in that a separation insulating flame-retardant belt (2) is wound on the outer side of the conductive wire core (1), a plurality of flame-retardant jackets (3) are wrapped on the outer sides of the conductive wire core (1) and the separation insulating flame-retardant belt (2), a fiber woven reinforcing layer (4) is wrapped on the outer side of the flame-retardant jackets (3), an inner liner (5) is wrapped on the outer side of the fiber woven reinforcing layer (4), and a hollow buffer sleeve (6) positioned inside the conductive wire core (1) is wrapped on the outer side of the inner liner (5).
  2. 2. The high-strength impact-resistant flame-retardant insulated cable according to claim 1, wherein the number of the conductive wire cores (1) is the same as that of the separated insulating flame-retardant tapes (2), and the sizes of the plurality of conductive wire cores (1) are the same.
  3. 3. The high-strength impact-resistant flame-retardant insulated cable according to claim 1, wherein the inner bushing (5) penetrates into the hollow buffer sleeve (6) to be fixedly connected, and the hollow buffer sleeve (6) is connected with the outer jacket (7) in an extrusion molding mode.
  4. 4. A process for producing a high-strength impact-resistant flame-retardant insulated cable according to any one of claims 1 to 3, characterized in that it comprises the following steps: Firstly, conductor pretreatment and wire core molding, namely twisting a plurality of metal conductor monofilaments to form a conductive wire core (1), coating insulating paint on the surface of the conductive wire core (1) and drying, and spirally winding a separated insulating flame-retardant belt (2) to form a primary wire core unit; step two, forming a flame-retardant sheath, twisting the wire core units prepared in the step one together with a filling rope, then synchronously extruding and wrapping the flame-retardant sheath (3) material outside the twisted body through an extrusion die, wherein the extrusion of the flame-retardant sheath (3) is completed in a crosslinking pipeline, and an electron beam irradiation crosslinking process is adopted; Step three, braiding reinforcement and lining compounding, braiding a fiber braiding reinforcement layer (4) on the outer side of the flame-retardant sheath (3) after cooling and shaping, coating a layer of hot melt adhesive on the surface of the fiber braiding reinforcement layer (4), immediately extruding an inner lining (5) material through an extrusion die, and melting the hot melt adhesive by utilizing extrusion temperature to realize fusion bonding compounding of the inner lining (5) and the fiber braiding reinforcement layer (4); step four, preparing and assembling a hollow buffer sleeve, preparing a tubular hollow buffer sleeve (6) in advance through extrusion molding, and injecting a phase change energy storage material mixed with nano ceramic powder into the cavity of the hollow buffer sleeve to be blocked; Step five, forming an outer sheath, namely extruding the material of the outer sheath (7) outside the hollow buffer sheath (6) by adopting an extrusion die, and applying circumferential rotation traction force by the die in the extrusion process to enable the material of the outer sheath (7) to generate a directional fiber orientation structure in a molten state; and step six, post-processing and winding, performing water-cooling shaping and spark detection on the coated cable, and finally collecting the cable into a disc through a winding device.
  5. 5. The production process of the high-strength impact-resistant flame-retardant insulated cable according to claim 4, wherein the preparation method of the flame-retardant sheath (3) material in the second step comprises the steps of taking, by weight, 40-60 parts of polybenzoxazine resin, 10-20 parts of boron nitride nanosheets, 30-50 parts of aluminum hydroxide, 5-10 parts of silicone master batch and 1-3 parts of processing aid, uniformly mixing all components except the polybenzoxazine resin in a high-speed mixer, and then carrying out melt blending and extrusion granulation with the polybenzoxazine resin in a double-screw extruder to obtain the flame-retardant sheath (3) particle material, wherein the dose of electron beam irradiation crosslinking is 80-150kGy.
  6. 6. The production process of the high-strength impact-resistant flame-retardant insulated cable according to claim 4, wherein the phase-change energy storage material in the fourth step is a composite of paraffin and expanded graphite, the phase-change temperature range is 50-70 ℃, and the nano ceramic powder is alumina or silicon nitride powder, and the addition amount of the nano ceramic powder is 5-15% of the weight of the phase-change energy storage material.
  7. 7. The production process of the high-strength impact-resistant flame-retardant insulated cable according to claim 4, wherein the woven fibers of the fiber woven reinforcing layer (4) in the third step are subjected to pretreatment before weaving, the pretreatment process comprises the steps of sequentially immersing the fibers in an ethanol solution of a silane coupling agent, drying, treating the fibers in an ultrasonic treatment tank containing a nano graphene dispersion liquid, and finally drying for later use.
  8. 8. The process for producing the high-strength impact-resistant flame-retardant insulated cable according to claim 4, wherein the extrusion molding of the outer sheath (7) in the fifth step adopts a rotary extrusion die, the die rotates around the cable axis at a rotating speed of 100-500r/min, the extrusion temperature is 150-180 ℃, the cable immediately enters a controllable step cooling channel after the extrusion, and the temperature in the channel gradually decreases from 180 ℃ to 60 ℃ along the cable travelling direction.
  9. 9. The process for producing the high-strength impact-resistant flame-retardant insulated cable according to claim 4, wherein the method further comprises the steps of intelligent online monitoring, setting an online calliper and a thermal infrared imager at the outlet of the extrusion die in the second step and the fifth step, setting a comprehensive measurement and control table after spark detection in the sixth step, monitoring the outer diameter, the temperature and insulation defect data in real time, linking with a central control system, and automatically adjusting the process parameters of the corresponding links.
  10. 10. The process for producing the high-strength impact-resistant flame-retardant insulated cable according to claim 4, wherein a laser marking machine is arranged in front of the winding device in the step six, and information comprising production batches, specifications, lengths and unique traceability codes is printed on the surface of the cable outer sheath (7) according to a central control system instruction.

Description

High-strength impact-resistant flame-retardant insulated cable and production process thereof Technical Field The invention relates to the field of cables, in particular to a high-strength impact-resistant flame-retardant insulated cable and a production process thereof. Background The insulated cable is a key carrier for transmitting electric energy and transmitting signals, is widely applied to various fields of energy, traffic, construction, industrial production and the like, and is increasingly complex in laying environment along with the development of a modern power system to the directions of high voltage, large capacity and high reliability, so that the comprehensive performance of the cable is increasingly demanding; However, conventional flame-retardant cables mostly adopt a method of adding a large amount of inorganic flame retardant into a polymer matrix to achieve the flame-retardant purpose, however, such a method tends to cause a decrease in mechanical strength of the material, deterioration in processing flowability, and high filling amount required to achieve high flame-retardant level affects insulation performance, and to solve strength problems, a metal braid or armor layer is usually arranged outside the cable core, but this increases weight and cost of the cable and may affect flexibility. In the aspect of heat dissipation, the traditional cable mainly depends on heat conduction of the material and heat dissipation of the external environment, and when a circuit is overloaded or locally overheated, insulation aging is accelerated due to heat accumulation, so that potential safety hazards exist. In impact protection, it is common practice to increase the jacket thickness or to use a stiffer material, but this compromises the bending properties of the cable. Meanwhile, in the cable production process, the problems of residual cross-linking agent, long pre-drying channel, high energy consumption, pollution risk and the like exist in the traditional chemical cross-linking, the extrusion molding of the sheath adopts a conventional direct extrusion mode, the molecular chain orientation of the material is random, the mechanical properties of the sheath in different directions can be different, and the internal stress is easy to generate in the cooling process, so that the long-term dimensional stability and the environmental stress cracking resistance are influenced. In addition, the quality control of the production process is mostly dependent on off-line and spot check modes, so that real-time and closed-loop accurate control of key parameters of the whole production process is difficult to realize, and the product consistency is guaranteed to have a lifting space. Disclosure of Invention The invention mainly aims to provide a high-strength impact-resistant flame-retardant insulated cable and a production process thereof, which can effectively solve the technical problems of the background technology. In order to achieve the above purpose, the technical scheme adopted by the invention is as follows: The utility model provides a fire-retardant insulated cable of high strength shock resistance, includes conductive core and outer sheath, outer sheath is located conductive core's outside, conductive core's outside winding has the insulating fire-retardant area of separation, and is many conductive core and the outside parcel of separating insulating fire-retardant area have fire-retardant sheath, the outside parcel of fire-retardant sheath has the fibre to weave the enhancement layer, the outside parcel of fibre to weave the enhancement layer has the bush, the outside parcel of bush has the hollow buffer sleeve that is located conductive core inside. Preferably, the number of the conductive wire cores is the same as that of the separated insulating flame-retardant tapes, and the sizes of the plurality of conductive wire cores are the same. Preferably, the inner bushing penetrates into the hollow buffer sleeve to be fixedly connected, and the hollow buffer sleeve is connected with the outer sleeve in an extrusion molding manner. The production process of the high-strength impact-resistant flame-retardant insulated cable specifically comprises the following steps: Firstly, conductor pretreatment and wire core molding, namely twisting a plurality of metal conductor monofilaments to form a conductive wire core, coating insulating paint on the surface of the conductive wire core, drying, and spirally winding a separation insulating flame-retardant belt to form a primary wire core unit; Step two, forming a flame-retardant sheath, twisting the wire core units prepared in the step one together with a filling rope, and then synchronously extruding and wrapping a flame-retardant sheath material outside a twisted body through an extrusion die, wherein the extrusion of the flame-retardant sheath is completed in a crosslinking pipeline, and an electron beam irradiation crosslinking process is adopted; Step