Preparation method and preparation equipment of metal armored submarine cable

Abstract

The invention relates to the technical field of submarine cable manufacturing, and provides a preparation method and preparation equipment of a metal armored submarine cable, and the preparation method comprises the steps: wrapping a cable core with a thermal insulation layer to form a first cable; stranding and armoring the stranded wire on the first cable to form a second cable with an armoring layer; and heating the second cable, straightening the second cable after the armor layer reaches the first temperature, and enabling the armor layer to be attached to the heat insulation layer to form the metal armored submarine cable. According to the preparation method of the metal armored submarine cable, the outer side of the cable core is coated with the heat insulation layer, so that the cable core is protected, and the cable core is prevented from being damaged due to direct contact with a high-temperature stranded wire in the subsequent heating process. After the stranded wires are stranded and armored on the outer side of the heat insulation layer to form the armor layer, the armor layer and the cable core are integrally heated and then straightened, residual stress of the armor layer is eliminated, the armor layer can be completely attached to the cable core, and the situation that steel wires are uneven in stress, prone to abrasion and prone to breakage due to the fact that the armor layer and the cable core are not attached is avoided.

Description

Technical Field

[0001] The present invention relates to the technical field of submarine cable manufacturing, and in particular to a preparation method and preparation equipment for a metal armored submarine cable. Background Art

[0002] More than 70% of the earth's surface is covered by the ocean. The seabed is rich in resources such as oil, gas, minerals, and organisms, as well as material information about the origin of the earth, biological evolution, and the evolution of human society. Ocean exploration and geological sampling are the prerequisites for conducting marine scientific research, developing marine resources, and building marine engineering projects, and have become an important field for countries around the world to compete. With the development needs of the deep sea and polar regions, cabled unmanned submersibles have become an important tool for offshore development. As one of the components of the umbilical cable, it can realize the power transmission and control data transmission between the water control unit and the cabled unmanned submersible.

[0003] Metal armored umbilical cable is the most widely used umbilical cable due to its outstanding wear resistance and high strength. High-strength galvanized steel wire has the advantages of excellent corrosion resistance, wear resistance, high strength and low raw material price, and is the first choice for most metal armored umbilical cable armor materials. In the prior art, the steel wire is pre-deformed before twisting, and the steel wire is deformed in advance by a pre-deformation device into a curved state that will be formed after being twisted on the cable core. The degree of pre-deformation is positively correlated with the outer diameter of the cable core. However, due to the fluctuation of the outer diameter of the cable core, the degree of pre-deformation of the steel wire cannot be adjusted in real time, so the steel wire armor is prone to problems such as not fitting, loose, arching, and the cable is not round, resulting in uneven force on the steel wire, easy wear, and eventually lead to steel wire breakage. Summary of the invention

[0004] The present invention provides a method and equipment for preparing a metal armored submarine cable, which are used to solve the defects in the prior art that the steel wire armor and the cable core are not in close contact, which easily leads to uneven force on the steel wire, easy wear and easy breakage.

[0005] In a first aspect, the present invention provides a method for preparing a metal armored submarine cable, comprising: Wrapping a heat insulation layer on the outside of the cable core to form a first cable; Twisting and armoring the stranded wires with the first cable to form a second cable with an armor layer; The second cable is heated, and after the armor layer reaches a first temperature, the second cable is straightened to make the armor layer conform to the thermal insulation layer, so as to form the metal armored submarine cable.

[0006] According to the method for preparing the metal armored submarine cable of the present invention, before the step of twisting and armoring the stranded wires with the first cable to form a second cable with an armor layer, the method comprises: The strands are heated to a second temperature.

[0007] According to the method for preparing a metal armored submarine cable of the present invention, the first temperature is greater than or equal to 300°C and less than or equal to 350°C; the second temperature is greater than or equal to 80°C and less than or equal to 100°C.

[0008] According to the method for preparing a metal armored submarine cable of the present invention, the step of twisting and armoring the stranded wires with the first cable to form a second cable having an armor layer comprises: Pulling the stranded wire and the first cable through the stranding holes on the stranding die, and controlling the stranding die to rotate so that the stranded wire is wound around and stranded on the outside of the thermal insulation layer to form the armor layer; Wherein, a stranding diameter of the stranding die is smaller than a diameter of the second cable.

[0009] According to the method for preparing a metal armored submarine cable of the present invention, the step of heating the second cable and straightening the second cable after the armor layer reaches the first temperature comprises: pulling the second cable through a heating chamber of a heating device, and controlling the heating device to heat the second cable in the heating chamber so that the armor layer at an outlet of the heating chamber reaches the first temperature; The heated second cable is pulled and wound around a straightening wheel for straightening.

[0010] According to the method for preparing the metal armored submarine cable of the present invention, the step of coating the outer side of the cable core to form a heat insulation layer comprises: A polyimide aerogel tape is wound around the outer side of the cable core to form the thermal insulation layer covering the cable core.

[0011] According to the method for preparing the metal armored submarine cable of the present invention, the thickness of the thermal insulation layer is greater than or equal to 3 mm.

[0012] According to the method for preparing a metal armored submarine cable of the present invention, after the step of heating the second cable, straightening the second cable after the armor layer reaches the first temperature, and making the armor layer conform to the thermal insulation layer to form the metal armored submarine cable, the method further comprises: Cooling the metal armored submarine cable; An anti-corrosion coating is applied on the cooled armor layer.

[0013] In a second aspect, the present invention further provides a preparation device for the preparation method of the metal armored submarine cable according to any one of the above, comprising: Traction device, stranding die, first heating device, straightening wheel; The pulling device is used to pull the first cable and the stranded wire to the stranding mold, and the stranding mold is used to strand the stranded wire with the first cable to form the second cable; The traction device is used to pull the second cable to the first heating device, and the first heating device is used to heat the second cable; The traction device is used to wind the heated second cable around the straightening wheel, and the straightening wheel is used to straighten the second cable.

[0014] The preparation device according to the present invention further comprises a second heating device, wherein the second heating device is provided with a first heating chamber with openings at both ends; A plurality of heating tubes are circumferentially arranged on the cavity wall of the first heating cavity, and a heating hole is arranged on the heating tube. The heating hole is used to pass a single stranded wire, and the heating tube is used to heat the stranded wire in the heating hole; the traction device is also used to pull the stranded wire through the heating hole, and pull the heated stranded wire to the stranding mold.

[0015] The preparation method of the metal armored submarine cable of the present invention protects the cable core by coating the heat insulation layer on the outside of the cable core, so as to prevent the cable core from being damaged by direct contact with the high-temperature stranded wire during the subsequent heating process. After the stranded wire is twisted and armored on the outside of the heat insulation layer to form an armor layer, the armor layer and the cable core are heated and straightened as a whole to eliminate the residual stress of the armor layer, and the armor layer can be completely attached to the cable core, which effectively solves the problem that the steel wire armor and the cable core are not attached to each other, which easily leads to uneven force on the steel wire, easy wear and easy breakage. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions in the present invention or the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0017] Figure 1 This is one of the flow diagrams of the method for preparing a metal armored submarine cable provided in an embodiment of the present invention.

[0018] Figure 2 This is the second flow chart of the method for preparing the metal armored submarine cable provided in the embodiment of the present invention.

[0019] Figure 3 This is the third flow chart of the method for preparing the metal armored submarine cable provided in the embodiment of the present invention.

[0020] Figure 4Schematic diagram of a metal armored submarine cable provided in an embodiment of the present invention.

[0021] Figure 5 It is a schematic diagram of a first heating device provided in an embodiment of the present invention.

[0022] Figure 6 Schematic diagram of a second heating device provided in an embodiment of the present invention.

[0023] Reference numerals: 1. Cable core; 11. Conductor; 12. Optical fiber unit; 13. Cable core filling material; 14. Metal shielding sleeve; 15. Protective sleeve; 2. Thermal insulation layer; 3. Armor layer; 4. first heating device; 41. first shell; 42. second shell; 5. Second heating device; 51. First heating chamber; 52. Heating tube; 53. Heating hole. DETAILED DESCRIPTION

[0024] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be clearly and completely described below in conjunction with the drawings of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0025] Combine the following Figure 1-Figure 4 The preparation method of the metal armored submarine cable of the present invention is described.

[0026] In some embodiments, Figure 1 and Figure 4 As shown, the present invention provides a method for preparing a metal armored submarine cable, comprising the following steps: Step S101: Wrapping a heat insulation layer on the outside of the cable core to form a first cable.

[0027] Step S102: Twisting the stranded wires together and armoring the first cable to form a second cable with an armor layer.

[0028] Step S103: heating the second cable, and straightening the second cable after the armor layer reaches the first temperature, so that the armor layer is attached to the thermal insulation layer, so as to form a metal armored submarine cable.

[0029] In this embodiment, firstly, a thermal insulation layer 2 of sufficient thickness is formed on the outside of the cable core 1 by coating, winding, etc. The thermal insulation layer 2 has the properties of high and low temperature resistance, heat insulation, and non-flammability, and can provide thermal insulation protection for the cable core 1 during the subsequent heating process to prevent the cable core 1 from being damaged by direct contact with the high-temperature stranded wire. At the same time, the thermal insulation layer 2 can maintain its shape when the metal armored submarine cable is used in seawater for a long time after it is manufactured, and will not affect the performance of the metal armored submarine cable. The cable core 1 and the thermal insulation layer 2 together constitute a first cable.

[0030] After the first cable is manufactured, a plurality of stranded wires are twisted together with the first cable so that the plurality of stranded wires form a stacked structure on the outside of the first cable, and the stranded wires can be wound around the first cable, so that the plurality of stranded wires are completely covered on the first cable to form an armor layer 3. The armor layer 3 can serve as a load-bearing structure of the cable, increase the longitudinal tensile strength, and protect the cable core 1 from mechanical damage. The armor layer 3 and the first cable constitute the second cable.

[0031] After the second cable is manufactured, the second cable is placed in a heating device and the second cable is heated as a whole so that the armor layer 3 of the second cable can reach the first temperature. During the heating process, the heat insulation layer 2 on the outside of the cable core 1 can play a heat insulation role to prevent the cable core 1 from being damaged by direct contact with the high-temperature armor layer 3. After the armor layer 3 reaches the first temperature, the second cable is straightened as a whole in a hot state. After the hot straightening, the residual stress of each strand of the armor layer 3 is eliminated, and each strand of the innermost layer of the armor layer 3 can be completely attached to the heat insulation layer 2 on the outside of the cable core 1, thereby preventing the occurrence of major problems such as strand wear or even breakage due to abnormal strands.

[0032] The preparation method of the metal armored submarine cable of the present invention is to protect the cable core 1 by coating the heat insulation layer 2 on the outside of the cable core 1, so as to prevent the cable core 1 from being damaged by direct contact with the high-temperature stranded wire during the subsequent heating process. After the stranded wire is twisted and armored on the outside of the heat insulation layer 2 to form the armor layer 3, the armor layer 3 and the cable core 1 are heated and straightened as a whole to eliminate the residual stress of the armor layer 3, and the armor layer 3 can be completely attached to the cable core 1, which effectively solves the problem that the steel wire armor and the cable core are not attached, which easily leads to uneven force on the steel wire, easy wear and easy breakage.

[0033] It is understandable that the cable core 1 generally includes various functional wire harnesses, fillers, metal shielding structures and protective structures inside. Specifically, the cable core 1 includes a conductor 11, an optical fiber unit 12, a cable core filling material 13, a metal shielding sleeve 14 and a protective sleeve 15. A receiving cavity is formed in the metal shielding sleeve 14, and the conductor 11, the optical fiber unit 12 and the cable core filling material 13 are arranged in the receiving cavity. The conductor 11 is used to transmit electric energy, the optical fiber unit 12 is used to transmit optical signals, and the cable core filling material 13 is used to fill the gap between the receiving cavity, the conductor 11 and the optical fiber unit 12. The metal shielding sleeve 14 is used to block the interference of the external electromagnetic field, reduce the electromagnetic radiation of the conductor 11 to the outside of the cable core 1, and protect the conductor 11, the optical fiber unit 12 and the cable core filling material 13. The protective sleeve 15 is sleeved on the outside of the metal shielding sleeve 14 to further protect the structure inside the cable core 1.

[0034] In a specific embodiment, the conductor 11 includes a conductor composed of twisted copper monofilaments and an insulating layer coated on the outside of the conductor; the optical fiber unit 12 includes a 316L seamless stainless steel tube and an optical fiber and optical paste arranged in the seamless stainless steel tube; the cable core filling material 13 is a water-blocking composite material that can be cured at room temperature; the metal shielding sleeve 14 is composed of a metal tape wrapping or a tape wrapping plus a metal wire braid. When the metal tape or other tape is wrapped, in order to ensure that the cable core 1 is completely covered to prevent the cable core filling material 13 from overflowing, the wrapping overlap rate is usually controlled at 30%; the protective sleeve 15 is composed of an insulating polyethylene extrusion package.

[0035] Optionally, the stranded wires may be galvanized steel wires or stainless steel wires.

[0036] In some embodiments, Figure 2 and Figure 4 As shown, before step S102: twisting the stranded wires together and armoring the first cable to form a second cable with an armor layer, the following steps are also included: Step S1019: heating the strands to a second temperature.

[0037] In this embodiment, before the stranded wires are twisted and armored on the first cable, the stranded wires can be preheated to the second temperature, and then the heated stranded wires are twisted and armored on the first cable to form the armor layer 3, so that the armor layer 3 has a higher initial temperature. When the second cable is subsequently heated, the time for heating the armor layer 3 to the first temperature can be effectively shortened. By preheating the stranded wires in advance, the subsequent heating time of the entire second cable can be effectively shortened, thereby improving the production efficiency of the metal armored submarine cable.

[0038] It will be appreciated that the second temperature is typically lower than the first temperature.

[0039] Specifically, in some embodiments, the first temperature is greater than or equal to 300° C. and less than or equal to 350° C.; the second temperature is greater than or equal to 80° C. and less than or equal to 100° C.

[0040] In this embodiment, before the stranded wires are twisted and armored on the first cable, the stranded wires can be preheated to between 80 and 100°C, which will not have a significant impact on the mechanical properties of the stranded wires, nor will it affect the subsequent twisting and armoring operations. At the same time, it will not cause damage to the twisting equipment due to excessive temperature, and can effectively shorten the subsequent heating time of heating the armor layer 3 to the first temperature. The first temperature is greater than or equal to 300°C and less than or equal to 350°C, which can effectively eliminate the residual stress of each strand in the armor layer 3 and facilitate straightening.

[0041] Specifically, in some embodiments, step S102: twisting and armoring the stranded wires with the first cable to form a second cable with an armor layer includes: The pulling stranded wire and the first cable pass through the stranding holes on the stranding die, and the stranding die is controlled to rotate so that the stranded wire is wound and stranded on the outside of the thermal insulation layer to form an armor layer.

[0042] The stranding diameter of the stranding die is smaller than the diameter of the second cable.

[0043] In this embodiment, after the first cable is manufactured, the first cable and the stranded wire are pulled and passed through the stranding holes on the stranding mold. During the passage of the first cable and the stranded wire, the stranding mold is controlled to rotate, so that the stranded wire can be driven to rotate around the first cable and the stranded wire is pressed against the outside of the thermal insulation layer 2, so that the stranded wire is twisted outside the thermal insulation layer 2 to form an armor layer 3.

[0044] At the same time, the stranding diameter of the stranding die is set to be smaller than the diameter of the second cable. It is understandable that the stranding die is provided with a clamping mechanism for clamping the stranded wire to the thermal insulation layer 2, and the clamping mechanism surrounds the first cable, so that when the stranded wire is clamped to the thermal insulation layer 2, the distance between the clamping mechanism and the central axis of the first cable needs to be smaller than the outer diameter of the second cable, so that the stranded wire can be better clamped to the thermal insulation layer 2. After the stranding is completed, the armor layer 3 will rebound slightly, so that the second cable after the stranding reaches the designed outer diameter.

[0045] Specifically, in some embodiments, the stranding diameter=(second cable outer diameter−0.1-0.2) mm.

[0046] In some embodiments, the step of heating the second cable and straightening the second cable after the armor layer reaches the first temperature comprises the following steps: The second cable is pulled through the heating chamber of the heating device, and the heating device is controlled to heat the second cable in the heating chamber, so that the armor layer at the outlet of the heating chamber reaches the first temperature.

[0047] The heated second cable is pulled and wound around a straightening wheel for straightening.

[0048] In this embodiment, the second cable is allowed to pass through the heating chamber of the heating device by means of traction. The second cable is heated when passing through the heating chamber, and the armor layer 3 reaches the first temperature at the exit position of the heating chamber, so that the second cable with the armor layer 3 reaching the first temperature can be subsequently pulled onto the straightening wheel for correction. The traction movement method can enable the second cable to move continuously without pausing in between, which is beneficial to improving production efficiency.

[0049] In some embodiments, the step of forming a thermal insulation layer on the outer side of the cable core includes: A polyimide aerogel tape is wound around the outside of the cable core to form a heat insulation layer covering the cable core.

[0050] In this embodiment, a polyimide aerogel tape is wrapped around the outside of the cable core 1 to form an insulation layer 2, which can ensure that the cable core 1 is not burned by the heated armor layer 3. The polyimide aerogel has excellent properties such as high and low temperature resistance, heat insulation, ultra-lightness, non-flammability, and good toughness. After being coated on the outer layer of the cable core 1, it has excellent insulation performance and will not affect the performance of the final metal armored submarine cable.

[0051] Specifically, in some embodiments, the thickness of the thermal insulation layer 2 is greater than or equal to 3 mm. In this embodiment, by setting the thickness of the thermal insulation layer 2 to 3 mm or more, the thermal insulation layer 2 has better thermal insulation performance, and can protect the cable core 1 from damage when the instantaneous temperature outside the thermal insulation layer 2 reaches up to 450°C.

[0052] In some embodiments, Figure 3 and Figure 4 As shown, step S103: heating the second cable, straightening the second cable after the armor layer reaches the first temperature, so that the armor layer is attached to the insulation layer to form a metal armored submarine cable, and further comprising the following steps: Step S104: Cooling the metal armored submarine cable.

[0053] Step S105: applying an anti-corrosion coating on the cooled armor layer.

[0054] In this embodiment, after the second cable is straightened to form a metal armored submarine cable, the metal armored submarine cable can be cooled by air cooling or the like to prevent the long-term high temperature of the armor layer 3 from damaging the internal cable core 1. After the metal armored submarine cable is completely cooled, an anti-corrosion coating can be applied to the outside of the armor layer 3 to enhance the anti-corrosion performance of the armor layer 3.

[0055] On the other hand, the present invention further provides a preparation device, which adopts the preparation method of the metal armored submarine cable in the above embodiment to manufacture the metal armored submarine cable. By adopting the preparation method in the above embodiment, the preparation device of the present invention also has the advantages of the above preparation method, which will not be repeated here.

[0056] Specifically, the preparation device of the present invention includes: a traction device (not shown), a stranding mold (not shown), a first heating device 4 (such as Figure 5 The traction device is used to pull the first cable and the stranded wire to the stranding die, and the stranding die is used to strand the stranded wire with the first cable to form a second cable. The traction device is used to pull the second cable to the first heating device 4, and the first heating device 4 is used to heat the second cable; the traction device is used to wind the heated second cable around the straightening wheel, and the straightening wheel is used to straighten the second cable.

[0057] In this embodiment, it is understandable that the traction device has multiple traction ends, and the multiple traction ends can be connected to the first cable, the second cable and the stranded wire through structures such as traction ropes and traction belts, so as to pull the first cable, the second cable and the stranded wire to the corresponding device for processing. Specifically, the traction device can pull the first cable and the stranded wire with the thermal insulation layer 2 to the stranding mold, and the stranding mold will strand the stranded wire to the outside of the first cable to form the armor layer 3 to make the second cable; then the traction device can pull the second cable to the first heating device 4 for heating, and after the armor layer 3 of the second cable is heated to the first temperature, the traction device will continue to pull the second cable to the straightening wheel for straightening to eliminate the residual stress of the stranded wire of the armor layer 3, so that the armor layer 3 is completely attached to the thermal insulation layer 2.

[0058] Specifically, the traction device may include a first traction device and a second traction device. The first traction device is used to connect with the first cable, so that the first cable passes through the twisting mold, and the second cable passes through the first heating device 4 and is wound around the straightening wheel; the second traction device is used to pull multiple strands, and pull the multiple strands to the twisting mold and twist them with the first cable.

[0059] Specifically, in some embodiments, Figure 5 As shown, the first heating device 4 includes a first shell 41 and a second shell 42. The first shell 41 and the second shell 42 are rotatably connected, and the first shell 41 can rotate relative to the second shell 42 between a first position and a second position.

[0060] In the first position, the first shell 41 and the second shell 42 are abutted and surrounded to form a second heating chamber with openings at both ends. A radiation heating device 43 is circumferentially arranged on the inner wall of the second heating chamber to heat the armor layer 3 of the second cable passing through the second heating chamber.

[0061] In the second position, the first housing 41 and the second housing 42 are unfolded to form an opening for the second cable to pass through, so that when the machine is stopped, the first housing 41 and the second housing 42 are unfolded to take out the second cable from the opening.

[0062] In some embodiments, Figure 6 As shown, the preparation equipment also includes a second heating device 5, and a first heating chamber 51 with two ends opened is provided in the second heating device 5. A plurality of heating tubes 52 are arranged circumferentially on the cavity wall of the first heating chamber 51, and a heating hole 53 is arranged on the heating tube 52. The heating hole 53 is used to pass a single stranded wire, and the heating tube 52 is used to heat the stranded wire in the heating hole 53. The traction device is also used to pull the stranded wire through the heating hole 53, and pull the heated stranded wire to the stranding die.

[0063] In this embodiment, a second heating device 5 is provided, the second heating device 5 has a first heating chamber 51 with openings at both ends, a plurality of heating tubes 52 are provided on the chamber wall of the first heating chamber 51, and each heating tube 52 is provided with a heating hole 53. The traction device can pull each strand through the corresponding heating hole 53. When the strand passes through the heating hole 53, it is preheated by the heating tube 52, and after the heating is completed, it is pulled to the stranding mold by the traction device.

[0064] Optionally, a fixing bracket is provided at the end of the second heating device 5 , and a screw hole is provided on the fixing bracket so that the fixing bracket of the second heating device 5 and the external structure can be connected by bolts.

[0065] Specifically, in some embodiments, the stranded wire is heated to 80-100°C after passing through the second heating device 5. The length of the second heating chamber of the first heating device 4 is 2m, the pulling speed of the second cable when passing through the second heating chamber is 0.5m / min, each section of the armor layer 3 can be heated in the second heating chamber for 4min, and the temperature of the armor layer 3 rises to 300-350°C after passing through the second heating chamber. The wheel groove width of the straightening wheel = (the outer diameter of the second cable + 0.3) mm.

[0066] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method for preparing a metal armored submarine cable, characterized in that: include: Wrapping a heat insulation layer on the outside of the cable core to form a first cable; Twisting and armoring the stranded wires with the first cable to form a second cable with an armor layer; The second cable is heated, and after the armor layer reaches a first temperature, the second cable is straightened to make the armor layer conform to the thermal insulation layer, so as to form the metal armored submarine cable.

2. The method for preparing a metal armored submarine cable according to claim 1, characterized in that: Before the step of twisting the stranded wires and armoring them on the first cable to form a second cable with an armor layer, the method includes: The strands are heated to a second temperature.

3. The method for preparing a metal armored submarine cable according to claim 2, characterized in that: The first temperature is greater than or equal to 300° C. and less than or equal to 350° C.; the second temperature is greater than or equal to 80° C. and less than or equal to 100° C.

4. The method for preparing a metal armored submarine cable according to claim 1, characterized in that: The step of twisting and armoring the stranded wires with the first cable to form a second cable with an armor layer comprises: Pulling the stranded wire and the first cable through the stranding holes on the stranding die, and controlling the stranding die to rotate so that the stranded wire is wound around and stranded on the outside of the thermal insulation layer to form the armor layer; Wherein, a stranding diameter of the stranding die is smaller than a diameter of the second cable.

5. The method for preparing a metal armored submarine cable according to claim 4, characterized in that: The step of heating the second cable and straightening the second cable after the armor layer reaches the first temperature comprises: pulling the second cable through a heating chamber of a heating device, and controlling the heating device to heat the second cable in the heating chamber so that the armor layer at an outlet of the heating chamber reaches the first temperature; The heated second cable is pulled and wound around a straightening wheel for straightening.

6. The method for preparing a metal armored submarine cable according to claim 1, characterized in that: The step of coating the outer side of the cable core to form a heat insulation layer comprises: A polyimide aerogel tape is wound around the outer side of the cable core to form the heat insulation layer covering the cable core.

7. The method for preparing a metal armored submarine cable according to claim 6, characterized in that: The thickness of the heat insulation layer is greater than or equal to 3 mm.

8. The method for preparing a metal armored submarine cable according to claim 1, characterized in that: After the step of heating the second cable and straightening the second cable after the armor layer reaches the first temperature so as to make the armor layer conform to the thermal insulation layer to form the metal armored submarine cable, the method further includes: Cooling the metal armored submarine cable; An anti-corrosion coating is applied on the cooled armor layer.

9. A preparation device for a metal armored submarine cable according to any one of claims 1 to 8, characterized in that: include: Traction device, stranding die, first heating device, straightening wheel; The pulling device is used to pull the first cable and the stranded wire to the stranding mold, and the stranding mold is used to strand the stranded wire with the first cable to form the second cable; The traction device is used to pull the second cable to the first heating device, and the first heating device is used to heat the second cable; The traction device is used to wind the heated second cable around the straightening wheel, and the straightening wheel is used to straighten the second cable.

10. The preparation device according to claim 9, characterized in that: It also includes a second heating device, wherein the second heating device is provided with a first heating chamber with openings at both ends; A plurality of heating tubes are circumferentially arranged on the cavity wall of the first heating cavity, and a heating hole is arranged on the heating tube. The heating hole is used to pass a single stranded wire, and the heating tube is used to heat the stranded wire in the heating hole; the traction device is also used to pull the stranded wire through the heating hole, and pull the heated stranded wire to the stranding mold.

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