A high temperature resistant and aging resistant cable and preparation method thereof

Abstract

The present invention relates to the technical field of cable preparation, and in particular to a high temperature resistant and aging resistant cable and a preparation method thereof, comprising a central conductor, a composite high temperature resistant fluororubber winding layer coated on the periphery of the central conductor, a first braided layer coated on the periphery of the composite high temperature resistant fluororubber winding layer, a first insulating layer and a second insulating layer coated sequentially from the inside to the outside on the periphery of the first braided layer, a high temperature resistant yarn braided layer coated on the outer layer of the second insulating layer, a first hydrophobic water blocking layer and a second hydrophobic layer coated on the outside of the high temperature resistant yarn braided layer, and an outer sheath coated on the outside of the plastic coated tape layer. The high temperature resistant and aging resistant cable of the present invention can effectively ensure the high temperature resistance and aging resistance of the cable. During the construction and laying process, the cable has good easy bending performance, which reduces the difficulty of bending the cable during the installation process, improves its flexibility and ensures the protection of its internal central conductor.

Description

Technical Field

[0001] The invention relates to the technical field of cable preparation, in particular to a high temperature resistant and aging resistant cable and a preparation method thereof. Background Art

[0002] Power cables are cables used to transmit and distribute electrical energy. Power cables are commonly used in urban underground power grids, power station lead-out lines, internal power supply for industrial and mining enterprises, and underwater transmission lines across rivers and seas.

[0003] There are many types of cable products on the market, which are mainly divided into: power cables, control cables, compensation cables, shielded cables, high-temperature cables, computer cables, signal cables, coaxial cables, fire-resistant cables, marine cables, mining cables, aluminum alloy cables, etc. Their structure is composed of single or multiple strands of wires and an insulation layer, which are used to connect circuits, electrical appliances, etc.

[0004] In the prior art, many improved types of cables have also appeared in recent years. For example, in the patent publication number CN113035422B, it includes a reinforcing core, a reinforcing plate is fixedly connected to the surface of the reinforcing core, a protective sleeve is fixedly connected to one end of the reinforcing plate, a circular arc-shaped protrusion is fixedly connected to the surface of the reinforcing core, a circular through hole is provided in the circular arc-shaped protrusion, a cable core is arranged in the cavity formed by the reinforcing core and the protective sleeve, a filler is arranged around the cable core in the cavity, a shielding layer is sheathed on the outer surface of the protective sleeve, a fire-resistant layer is sheathed on the outer surface of the shielding layer, a reinforcing layer is sheathed on the outer surface of the fire-resistant layer, a sheath layer is sheathed on the outer surface of the reinforcing layer, a reinforcing ring is fixedly connected to the outer side of the reinforcing layer, reinforcing ribs are arranged inside the reinforcing ring, and an anti-pressure ring is fixedly connected to the outer side of the reinforcing layer... an inner reinforcing layer is sheathed on the outer side of the inner shielding layer, an inner sheath layer is sheathed on the outer side of the inner reinforcing layer, an inner anti-pressure ring is fixedly connected to the outer surface of the inner reinforcing layer, and the outer surface of the inner anti-pressure ring contacts the inner surface of the inner sheath layer.

[0005] It can be seen from the structure of the cable recorded in the above patent that an array-distributed reinforcing plate structure is used to enhance the supporting strength of the cable. However, this structural design brings difficulties to the bending of the cable during laying, resulting in a decrease in the bending resistance of the cable. Under small-diameter installation conditions, the cable is prone to being difficult to bend or unable to bend to the expected angle.

[0006] In addition, this cable structure in the prior art has an impact on its overall heat dissipation capacity and high temperature resistance when used in high power and high heat situations.

[0007] To this end, the present invention has improved the problems existing in the prior art, and hereby proposes a cable product that is resistant to high temperature, aging and has good bending resistance and a preparation method thereof, so as to better solve the problems existing in the prior art. Summary of the invention

[0008] The present invention solves one of the above-mentioned technical problems, and the technical solution adopted is: a high-temperature resistant and aging-resistant cable, including a central conductor, a composite high-temperature resistant fluororubber winding layer is tightly wrapped around the periphery of the central conductor in a spirally wound manner, a first braided layer is coated around the periphery of the composite high-temperature resistant fluororubber winding layer, a first insulating layer and a second insulating layer are sequentially coated on the periphery of the first braided layer from the inside to the outside, a high-temperature resistant yarn braided layer is coated on the outer layer, a first hydrophobic water-blocking layer and a second hydrophobic layer are coated on the outside of the high-temperature resistant yarn braided layer, a plastic-coated tape layer is arranged between the first hydrophobic water-blocking layer and the second hydrophobic layer, and an outer protective layer is coated on the outside of the plastic-coated tape layer.

[0009] In any of the above solutions, preferably, a second braided layer covering the outside of the first insulating layer is further provided between the first insulating layer and the second insulating layer.

[0010] In any of the above solutions, preferably, the first braided layer and the second braided layer are both metal composite braided layers woven from copper ribbons and insulating high-temperature resistant material ribbons.

[0011] In any of the above schemes, it is preferred that the copper wire belt is mixed with the insulating high-temperature resistant material wire belt and is woven into a metal braided layer, the main purposes of which include: first, it is coated on the periphery of the central conductor to shield or reduce the influence of external electric and magnetic fields; second, as a braided structure, it can achieve covering protection for the internal central conductor, and at the same time, the braided structure can have a certain degree of flexibility, which makes it easy to bend while providing protection, thereby reducing the difficulty of turning when laying cables and reducing the difficulty of construction.

[0012] In any of the above solutions, preferably, the outer protective layer is made of high temperature resistant PVC material.

[0013] In any of the above schemes, preferably, the composite high temperature resistant fluororubber winding layer includes a high temperature resistant shaping rubber strip tightly threadedly wound around the periphery of the central conductor, and the pitch between adjacent thread segments of the high temperature resistant shaping rubber strip is 3mm-5mm.

[0014] In any of the above schemes, preferably, the cross-section of the high-temperature resistant shaping rubber strip is H-shaped, and the inner side wall and the outer side wall of the high-temperature resistant shaping rubber strip are respectively provided with an inner spiral heat dissipation groove and an outer thread heat dissipation groove.

[0015] A plurality of communicating heat dissipation holes are arranged between the inner spiral heat dissipation groove and the outer thread heat dissipation groove at intervals along the spiral winding direction thereof.

[0016] In any of the above schemes, it is preferred that the preparation materials of the high temperature resistant shaping rubber strip include the following components in parts by weight: 30-40 parts of fluororubber raw rubber particles, 10 parts of carbon black powder, 5-10 parts of ceramic powder, 0.1-0.5 parts of dispersant, 5-10 parts of flame retardant, 0.02-0.06 parts of vulcanizing aid, 1-2 parts of paraffin oil, 3-0.7 parts of zinc oxide powder, 0.15-0.5 parts of antioxidant, and 0.2-0.8 parts of vulcanizing agent.

[0017] In any of the above schemes, preferably, the method for preparing the high temperature resistant shaping rubber strip comprises the following steps:

[0018] Put the following solid materials in the above weight proportions: fluororubber raw rubber particles, carbon black powder, ceramic powder, and zinc oxide powder into the mixer and mix thoroughly;

[0019] After the solid materials are mixed, they are put into the internal mixer in batches by means of vibration. The internal mixer is cooled by water during operation.

[0020] The temperature of the internal mixer working room is controlled to be less than 150°C, and the mixer is operated for 30-60 seconds. Then, the following liquid materials in the above weight proportions: dispersant, flame retardant, and paraffin oil are added into the internal mixer, and the mixing is performed for 4-8 minutes. The temperature of the rubber is controlled to be between 120°C and 150°C, and the rubber is discharged and cooled to obtain the first-grade rubber mixture.

[0021] The obtained first-grade rubber mix is ​​put into a refrigerator to be solidified at low temperature, and the solidified first-grade rubber mix is ​​crushed to form granular or powdered rubber mix crushed material;

[0022] The obtained rubber powder is put into the internal mixer again for secondary internal mixing, and the mixture is worked for 30-60 seconds. Then, the vulcanizing aid, vulcanizing agent and antioxidant in the above-mentioned weight proportions are evenly dispersed and put into the internal mixer for internal mixing for 2-3 minutes. The temperature of the rubber is controlled to be below 110°C, and the rubber is sent to the injection molding machine for extrusion molding to obtain a straight high-temperature resistant rubber strip. The molded high-temperature resistant rubber strip is pulled into the cross-linking vulcanization workshop and spirally wound on the outer wall of the copper wire as the central conductor under the action of the spiral winding machine.

[0023] In any of the above schemes, preferably, the high temperature resistant shaping rubber strip is prepared and formed by mixing high temperature resistant rubber material and ceramic powder.

[0024] The present invention also provides a method for preparing a high temperature resistant and aging resistant cable, wherein the cable is the above-mentioned high temperature resistant and aging resistant cable, and the method for preparing the high temperature resistant and aging resistant cable comprises the following steps:

[0025] S1: A thick copper wire with an outer diameter of 10 mm is fed into a wire drawing machine for drawing to form a copper wire with an outer diameter of 4 mm as a central conductor, and the tension is controlled and monitored during the drawing process;

[0026] S2: The drawn copper wire enters the spiral winding machine inside the cross-linking vulcanization workshop in a stretched state according to the set stretching speed, and the winding speed of the spiral winding machine is adjusted to match the traveling speed of the copper wire, and the spiral winding of the high-temperature resistant shaping rubber strip is completed during the traveling process. After the spiral winding is completed, a composite high-temperature resistant fluororubber winding layer is formed on the outer wall of the central conductor;

[0027] S3: heating the interior of the cross-linking vulcanization workshop and controlling the internal temperature to 260°C-300°C, maintaining the temperature at the above temperature to complete the cross-linking and shaping of the rubber of the composite high-temperature resistant fluororubber winding layer, and maintaining the temperature at the above temperature, controlling the treatment time to complete the low-temperature annealing treatment of the copper wire of the central conductor;

[0028] S4: The central conductor is coated with the composite high-temperature resistant fluororubber winding layer and is continuously pulled downstream and sent into the low-speed braiding machine to complete the coating and braiding of the first braided layer on its outer wall, and is continuously pulled and transported;

[0029] S5: The semi-finished cable being towed and transported is sent to a coating process to complete coating of the first insulating layer outside the first braided layer. After coating, it is further sent downward to a high-speed braiding machine to complete braiding of the second braided layer. After braiding, it is sent to a downstream process to complete coating of the second insulating layer.

[0030] S6: After the second insulation layer coating process is completed, it is sent to the downstream process and the high temperature resistant yarn braiding layer is coated by a yarn braiding machine;

[0031] S7: After the coating of the high temperature resistant yarn braided layer is completed, it is continuously transported downstream and the coating process of the first hydrophobic water blocking layer, the plastic coated tape layer, and the second hydrophobic layer is completed in sequence;

[0032] S8: Finally, the outermost outer sheath is extruded, coated and formed to complete the coating of the cable harness. After the coating is completed, the entire cable is formed;

[0033] S9: The formed cables are sent to the downstream cable winding machine for performance inspection and winding. After winding, the cables are packaged, transported and shipped out.

[0034] Compared with the prior art, the present invention has the following beneficial effects:

[0035] 1. The high temperature resistant and aging resistant cable of the present invention can effectively ensure the high temperature resistance and aging resistance of the cable. At the same time, during the construction and laying process, the cable can have good bending performance, reduce the difficulty of bending the cable during the installation process, improve its flexibility, and ensure the protection of its internal center conductor.

[0036] 2. The spirally wound composite high temperature resistant fluororubber winding layer can effectively wrap around the center conductor. After the wrapping is completed, the presence of multiple pitch intervals can ensure good heat dissipation of the center conductor, and at the same time provide sufficient space for the bending of the center conductor to ensure its flexibility.

[0037] 3. The copper wire of the central conductor in this cable is subjected to low temperature annealing treatment, which can effectively reduce the internal stress and effectively improve the flexibility of the conductor.

[0038] 4. The spirally wound center conductor will generate heat during actual use. When the center conductor is overheated, heat will be dissipated through the space cavity at the pitch position. In addition, heat will also be conducted inside the spiral cavity formed by the inner spiral heat dissipation grooves and the outer wall of the center conductor.

[0039] 5. The first braided layer and the second braided layer wrapped around the outside are mainly used to shield the external electric field and magnetic field. The braided structure can effectively ensure the bendability of the entire cable. At the same time, the metal braided structure can also improve its overall flexibility and protection. The first braided layer combined with the composite high-temperature resistant fluororubber winding layer can also achieve the purpose of effective and rapid heat conduction in terms of heat dissipation and heat conduction. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following is a brief introduction to the drawings required for the specific embodiments or the description of the prior art. In all the drawings, similar elements or components are generally identified by similar reference numerals. In the drawings, the elements or components are not necessarily drawn according to the actual scale.

[0041] Figure 1 It is a schematic diagram of the cross-sectional structure of the cable of the present invention.

[0042] Figure 2 It is a schematic diagram of the winding structure of the composite high temperature resistant fluororubber winding layer of the present invention.

[0043] Figure 3 It is a schematic diagram of the three-dimensional structure of the composite high-temperature resistant fluororubber winding layer of the present invention.

[0044] Figure 4 for Figure 2 Schematic diagram of the local enlarged structure of part A in FIG.

[0045] In the figure, 1, center conductor; 2, composite high temperature resistant fluororubber winding layer; 201, high temperature resistant shaping rubber strip; 202, pitch; 203, inner spiral heat dissipation groove; 204, outer thread heat dissipation groove; 205, connecting heat dissipation hole; 3, first braided layer; 4, first insulating layer; 5, second insulating layer; 6, high temperature resistant yarn braided layer; 7, first hydrophobic water blocking layer; 8, second hydrophobic layer; 9, plastic coated tape layer; 10, outer sheath; 11, second braided layer. DETAILED DESCRIPTION

[0046] The following is a detailed description of the embodiments of the technical solution of the present invention in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present invention, and are therefore only used as examples, and cannot be used to limit the scope of protection of the present invention. Figure 1-Figure 4 as shown in .

[0047] Embodiment 1: A high temperature resistant and aging resistant cable comprises a central conductor 1, a composite high temperature resistant fluororubber winding layer 2 is tightly wrapped around the outer periphery of the central conductor 1 in a spirally wound manner, a first braided layer 3 is wrapped around the outer periphery of the composite high temperature resistant fluororubber winding layer 2, a first insulating layer 4 and a second insulating layer 5 are sequentially wrapped around the outer periphery of the first braided layer 3 from the inside to the outside, a high temperature resistant yarn braided layer 6 is wrapped around the outer layer of the second insulating layer 5, a first hydrophobic water blocking layer 7 and a second hydrophobic layer 8 are wrapped on the outside of the high temperature resistant yarn braided layer 6, a plastic coated tape layer 9 is arranged between the first hydrophobic water blocking layer 7 and the second hydrophobic layer 8, and an outer protective layer 10 is wrapped on the outside of the plastic coated tape layer 9.

[0048] In any of the above solutions, preferably, a second braided layer 11 covering the outside of the first insulating layer 4 is further provided between the first insulating layer 4 and the second insulating layer 5 .

[0049] In the present invention, tightly wrapping the composite high-temperature resistant fluororubber winding layer 2 in a spiral winding manner can effectively improve the bending ability of the entire central conductor 1 and reduce the difficulty of construction.

[0050] The first braided layer 3 and the second braided layer 11 wrapped around the outside mainly play the role of shielding the external electric field and magnetic field. The braided structure can effectively ensure the bendability of the entire cable. At the same time, the metal braided structure can also improve its overall flexibility and protection. The first braided layer 3 combined with the composite high-temperature resistant fluororubber winding layer 2 can also play the role of effective and rapid heat conduction in terms of heat dissipation and heat conduction.

[0051] The first insulating layer 4 and the second insulating layer 5 sandwich and cover the second braided layer 11 to ensure the structural stability of the second braided layer 11. At the same time, it can effectively ensure the bendability of the entire cable. At the same time, the metal braided structure can also improve its overall flexibility and protection.

[0052] The structure of the first hydrophobic water-blocking layer 7 and the second hydrophobic layer 8 can improve the waterproof performance of the entire cable, effectively improving the internal waterproof effect of the cable; in addition, a plastic-coated tape layer 9 is provided between the first hydrophobic water-blocking layer 7 and the second hydrophobic layer 8 to enhance its corrosion resistance and chemical stability while improving its waterproof performance, effectively improving the protection of the entire cable structure to the internal metal conductor.

[0053] The high temperature resistant yarn braided layer 6 wrapped around the outside of the first insulating layer 4 can enhance the strength of the entire cable internal structure, effectively ensure the restraint protection of the cable inside the first insulating layer 4, and at the same time, the use of high temperature resistant yarn braiding can ensure high temperature resistance and fireproof performance.

[0054] In any of the above solutions, it is preferred that the first braided layer 3 and the second braided layer 11 are both metal composite braided layers woven from copper ribbons and insulating high-temperature resistant material ribbons.

[0055] The first braided layer 3 and the first braided layer 3 can shield electromagnetic interference, eliminate the shielding effect of the surface potential of the power cable, and at the same time bundle the internal conductors to eliminate induced electricity; in addition, it can also play a shielding role for safety protection. When the copper wire belt of the braided layer is in good contact with the ground core or is used as a ground wire, it can promptly reflect the leakage situation.

[0056] In any of the above schemes, it is preferred that the copper wire belt is mixed with the insulating high-temperature resistant material wire belt and woven together to form a metal braided layer, the main purposes of which include: first, it is coated on the periphery of the central conductor 1 to shield or reduce the influence of external electric and magnetic fields; second, as a braided structure, it can achieve coating protection for the internal central conductor 1, and at the same time, the braided structure can have a certain degree of flexibility, which makes it easy to bend while providing protection, thereby reducing the difficulty of turning when laying cables and reducing the difficulty of construction.

[0057] In any of the above solutions, preferably, the outer protective layer 10 is made of high temperature resistant PVC material.

[0058] The outer sheath 10 at the outermost side plays a role in protecting the entire cable and effectively protects the cable from being scratched.

[0059] In any of the above schemes, preferably, the composite high temperature resistant fluororubber winding layer 2 includes a high temperature resistant shaping rubber strip 201 tightly threadedly wound around the periphery of the central conductor 1, and the pitch 202 between adjacent thread segments of the high temperature resistant shaping rubber strip 201 is 3mm-5mm.

[0060] By setting the appropriate pitch 202 interval, a bare section of the center conductor 1 can be formed at a certain interval, thereby ensuring the heat dissipation of the center conductor 1; in addition, the design of the pitch 202 space can effectively ensure the degree of bending when the entire cable is bent, making it more flexible and reducing the difficulty of bending operations during the installation process.

[0061] In any of the above schemes, preferably, the cross section of the high temperature resistant shaping rubber strip 201 is H-shaped, and the inner side wall and the outer side wall of the high temperature resistant shaping rubber strip 201 are respectively provided with an inner spiral heat dissipation groove 203 and an outer thread heat dissipation groove 204.

[0062] A plurality of communicating heat dissipation holes 205 are arranged between the inner spiral heat dissipation groove 203 and the outer spiral heat dissipation groove 204 at intervals along the spiral winding direction.

[0063] The spirally wound center conductor 1 will generate heat during actual use. When the center conductor 1 is overheated, heat will be dissipated through the space cavity at the pitch 202. In addition, heat will be conducted inside the spiral cavity formed by the inner spiral heat dissipation grooves 203 and the outer wall of the center conductor 1. When there is still excess heat, it will be dissipated from the inner spiral heat dissipation grooves 203 to the outer thread heat dissipation grooves 204 through the connected heat dissipation holes 205, thereby effectively ensuring the rapid cooling of the center conductor 1 cable. When dissipating heat to the periphery, since the outer high-temperature resistant shaping rubber strip 201 is made of high-temperature resistant and heat-dissipating materials, high-temperature resistance and flame retardancy safety can be guaranteed.

[0064] In any of the above schemes, it is preferred that the high-temperature resistant shaping rubber strip 201 is tightly threadedly wound around the periphery of the central conductor 1, which has the following effects: first, it is wrapped around the periphery of the central conductor 1 to protect the conductor; second, it is arranged on the outside of the central conductor 1 in a spirally wound manner. Since there is a pitch 202 gap between adjacent thread segments, it can reduce the bending resistance when the conductor is bent and improve the bendability of the entire cable structure; third, since the pitch 202 space between each adjacent thread segment is arranged on the periphery of the central conductor 1, it can improve the heat dissipation and heat overflow effects of the central conductor 1 when heated; fourth, the entire spirally arranged high-temperature resistant shaping rubber strip 201 is made of high-temperature resistant rubber material mixed with ceramic powder material, which itself has high temperature resistance and good heat dissipation, further ensuring the heat dissipation effect of the central conductor 1 from the material point of view.

[0065] In any of the above schemes, it is preferred that the preparation materials of the high temperature resistant shaping rubber strip 201 include the following components in parts by weight: 30-40 parts of fluororubber raw rubber particles, 10 parts of carbon black powder, 5-10 parts of ceramic powder, 0.1-0.5 parts of dispersant, 5-10 parts of flame retardant, 0.02-0.06 parts of vulcanizing aid, 1-2 parts of paraffin oil, 3-0.7 parts of zinc oxide powder, 0.15-0.5 parts of antioxidant, and 0.2-0.8 parts of vulcanizing agent.

[0066] In any of the above solutions, preferably, the method for preparing the high temperature resistant shaping rubber strip 201 comprises the following steps:

[0067] Put the following solid materials in the above weight proportions: fluororubber raw rubber particles, carbon black powder, ceramic powder, and zinc oxide powder into the mixer and mix thoroughly;

[0068] After the solid materials are mixed, they are put into the internal mixer in batches by means of vibration. The internal mixer is cooled by water during operation.

[0069] The temperature of the internal mixer working room is controlled to be less than 150°C, and the mixer is operated for 30-60 seconds. Then, the following liquid materials in the above weight proportions: dispersant, flame retardant, and paraffin oil are added into the internal mixer, and the mixing is performed for 4-8 minutes. The temperature of the rubber is controlled to be between 120°C and 150°C, and the rubber is discharged and cooled to obtain the first-grade rubber mixture.

[0070] The obtained first-grade rubber mix is ​​put into a refrigerator to be solidified at low temperature, and the solidified first-grade rubber mix is ​​crushed to form granular or powdered rubber mix crushed material;

[0071] The obtained rubber powder is put into the internal mixer again for secondary internal mixing, and the mixing is carried out for 30-60 seconds. Then, the vulcanizing aid, vulcanizing agent and antioxidant in the above-mentioned weight proportions are evenly dispersed and put into the internal mixer, and the mixing is carried out for 2-3 minutes. The temperature of the rubber is controlled to be below 110°C and the rubber is sent to the injection molding machine for extrusion molding to obtain a straight high-temperature resistant rubber strip 201. The molded high-temperature resistant rubber strip 201 is pulled into the cross-linking vulcanization workshop and spirally wound on the outer wall of the copper wire serving as the central conductor 1 under the action of the spiral winding machine.

[0072] In any of the above solutions, preferably, the high temperature resistant shaping rubber strip 201 is prepared and formed by mixing high temperature resistant rubber material and ceramic powder.

[0073] The high temperature resistant molded rubber strip 201 is a protective insulating structure wrapped around the periphery of the central conductor 1. The overall high temperature resistant rubber material can improve its high temperature resistance. In addition, during the material manufacturing process, the use of ceramic powder inside can improve the heat dissipation effect of the entire rubber and at the same time improve its overall protective strength.

[0074] Embodiment 2: Compared with Embodiment 1, this embodiment further includes the following contents:

[0075] The present invention also provides a method for preparing a high temperature resistant and aging resistant cable, wherein the cable is the above-mentioned high temperature resistant and aging resistant cable, and the method for preparing the high temperature resistant and aging resistant cable comprises the following steps:

[0076] S1: A thick copper wire with an outer diameter of 10 mm is fed into a wire drawing machine for drawing to form a copper wire with an outer diameter of 4 mm as a central conductor 1, and the tension is controlled and monitored during the drawing process;

[0077] S2: The drawn copper wire enters the spiral winding machine inside the cross-linking vulcanization workshop in a stretched state according to a set stretching speed, and the winding speed of the spiral winding machine is adjusted to match the traveling speed of the copper wire, and the spiral winding of the high-temperature resistant shaping rubber strip 201 is completed during the traveling process. After the spiral winding is completed, a composite high-temperature resistant fluororubber winding layer 2 is formed on the outer wall of the central conductor 1;

[0078] S3: heating the interior of the cross-linking vulcanization workshop and controlling the internal temperature thereof to 260°C-300°C, maintaining the temperature at the above temperature to complete the cross-linking and shaping of the rubber of the composite high-temperature resistant fluororubber wrapping layer 2, and maintaining the temperature at the above temperature, controlling the treatment time to complete the low-temperature annealing treatment of the copper wire of the central conductor 1;

[0079] The cross-linked and shaped composite high-temperature resistant fluororubber winding layer 2 can be better wound on the outer wall of the central conductor 1 to ensure the stability of the winding. The high-temperature resistant shaped rubber strip 201 with fluororubber as the main material under high temperature can better ensure the winding, coating and cross-linking of the central conductor 1, thereby improving the performance of the rubber. At the same time, under the same environment, the internal stress of the copper wire can be eliminated through low-temperature annealing treatment to prevent stress corrosion cracking, and the good plasticity state of the soft copper can be achieved through annealing. The copper wire after annealing can effectively soften the material, effectively ensuring that it can be bent and deformed to a certain extent according to the installation requirements without breaking. When performing the annealing treatment, the low-temperature annealing temperature for eliminating the internal stress is controlled to be 260℃-300℃, and the temperature is kept for 1h.

[0080] When the temperature is between 260°C and 300°C, the high-temperature resistant shaping rubber strip 201 with fluororubber as the main material can complete the cross-linking treatment, and the annealing of the copper conductor and the winding and shaping of the composite high-temperature resistant insulation winding layer can be completed simultaneously, thereby ensuring the high efficiency and synchronization of the molding of the central conductor 1 and the composite high-temperature resistant fluororubber winding layer 2, and ensuring the coating effect of the composite high-temperature resistant fluororubber winding layer 2.

[0081] S4: The composite high-temperature resistant fluororubber winding layer 2 coated on the central conductor 1 continues to be pulled downstream and sent into the low-speed braiding machine to complete the coating and braiding of the first braided layer 3 on its outer wall, and continues to be pulled and transported;

[0082] S5: The semi-finished cable being towed and transported is sent to a coating process to complete the coating of the first insulating layer 4 around the first braided layer 3. After the coating is completed, it is further sent downward to a high-speed braiding machine to complete the braiding of the second braided layer 11. After the braiding is completed, it is sent to a downstream process to complete the coating of the second insulating layer 5;

[0083] The first braided layer 3 is braided using a low-speed braiding machine, and the second braided layer 11 is braided using a high-speed braiding machine, which can effectively ensure the braiding effect.

[0084] S6: After the second insulating layer 5 is coated, it is sent to a downstream process and coated with a high temperature resistant yarn braided layer 6 using a yarn braiding machine;

[0085] S7: After the coating of the high temperature resistant yarn braided layer 6 is completed, it continues to be transported downstream and sequentially completes the coating process of the first hydrophobic water blocking layer 7, the plastic coated tape layer 9, and the second hydrophobic layer 8;

[0086] S8: Finally, the outermost outer sheath 10 is extruded, coated and formed to complete the coating of the cable harness. After the coating is completed, the entire cable is formed;

[0087] S9: The formed cables are sent to the downstream cable winding machine for performance inspection and winding. After winding, the cables are packaged, transported and shipped out.

[0088] The high temperature resistant and aging resistant cable of the present invention can effectively ensure the high temperature resistance and aging resistance of the cable. At the same time, during the construction and laying process, the cable can have good bending performance, reduce the difficulty of bending the cable during installation, improve its flexibility and ensure the protection of the central conductor 1 inside it; the spirally wound composite high temperature resistant fluororubber winding layer 2 can effectively wrap around and coat the central conductor 1. After the coating is completed, the presence of multiple pitches 202 intervals can ensure the good heat dissipation of the central conductor 1, and at the same time provide sufficient clearance space for the bending of the central conductor 1 to ensure its flexibility; the copper wire of the central conductor 1 in the cable is subjected to low temperature annealing treatment, which can effectively reduce internal stress and can effectively Improve the flexibility of the conductor; the spirally wound central conductor 1 will generate heat during actual use. When the central conductor 1 is overheated, heat will be dissipated through the space cavity at the pitch 202. In addition, heat will also be conducted inside the spiral cavity formed by the inner spiral heat dissipation grooves 203 and the outer wall of the central conductor 1. The first braided layer 3 and the second braided layer 11 are mainly coated on the periphery to shield the external electric field and magnetic field. The braided structure can effectively ensure the bendability of the entire cable. At the same time, the metal braided structure can also improve its overall flexibility and protection. The first braided layer 3 cooperates with the composite high-temperature resistant fluororubber winding layer 2 to effectively and quickly conduct heat in terms of heat dissipation and heat conduction.

[0089] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that the technical solutions described in the above embodiments can still be modified, or some or all of the technical features can be replaced by equivalents. These modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present invention. For those skilled in the art, any replacement improvements or changes made to the implementation methods of the present invention fall within the protection scope of the present invention.

[0090] The matters not described in detail in the present invention are all known technologies to those skilled in the art.

Claims

1. A high temperature resistant and aging resistant cable, characterized in that: The invention comprises a central conductor, a composite high-temperature resistant fluororubber winding layer is tightly wrapped in a spiral winding manner around the central conductor, a first braided layer is wrapped around the composite high-temperature resistant fluororubber winding layer, a first insulating layer and a second insulating layer are sequentially wrapped around the first braided layer from the inside to the outside, a high-temperature resistant yarn braided layer is wrapped around the outer layer of the second insulating layer, a first hydrophobic water-blocking layer and a second hydrophobic layer are wrapped outside the high-temperature resistant yarn braided layer, a plastic-coated tape layer is arranged between the first hydrophobic water-blocking layer and the second hydrophobic layer, and an outer sheath is wrapped outside the plastic-coated tape layer; The composite high temperature resistant fluororubber winding layer comprises a high temperature resistant shaping rubber strip tightly threadedly wound around the periphery of the central conductor, the pitch between adjacent thread segments of the high temperature resistant shaping rubber strip is 3mm-5mm; the high temperature resistant shaping rubber strip is prepared and formed by combining high temperature resistant rubber material and ceramic powder; The cross section of the high temperature resistant shaping rubber strip is H-shaped, and the inner side wall and the outer side wall of the high temperature resistant shaping rubber strip are respectively provided with an inner spiral heat dissipation groove and an outer thread heat dissipation groove; A plurality of communicating heat dissipation holes are arranged between the inner spiral heat dissipation groove and the outer thread heat dissipation groove at intervals along the spiral winding direction thereof.

2. A high temperature resistant and aging resistant cable according to claim 1, characterized in that: A second braided layer covering the outside of the first insulating layer is further provided between the first insulating layer and the second insulating layer.

3. A high temperature resistant and aging resistant cable according to claim 2, characterized in that: The first braided layer and the second braided layer are both metal composite braided layers woven from copper ribbons and insulating high-temperature resistant material ribbons.

4. A high temperature resistant and aging resistant cable according to claim 3, characterized in that: The outer protective layer is made of high temperature resistant PVC material.

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