Mineral insulation metal sheath cable and production method thereof

Abstract

The invention relates to the technical field of cables, in particular to a mineral insulation metal sheath cable and a production method thereof. The cable comprises a cable core, a mineral oxygen barrier layer, an inner flame-retardant layer, a semiconductor water-blocking tape, a metal reinforcing layer, an outer flame-retardant layer, a galvanized steel wire coating layer and an outer sheath which are sequentially sleeved from inside to outside. The invention aims to provide a mineral insulated metal sheath cable, so as to solve the problem that the existing method of only filling a water-blocking material into the cable is difficult to meet the high-performance water-blocking requirements of open seas and deep seas; the second purpose of the invention is to provide the production method of the mineral insulation metal sheath cable so as to solve the problems that the submarine cable in the existing production process is heavy and the performance of the water-blocking material manufacturing mode is poor.

Description

Technical Field

[0001] The present invention relates to the technical field of cables, and in particular to a mineral insulated metal sheathed cable and a production method thereof. Background Art

[0002] With the continuous acceleration of the economic construction speed, the number of various large industrial facilities, high-rise commercial buildings, underground buildings and residential houses is gradually increasing, and among them, the demand for cables in the domestic offshore wind power industry is gradually increasing.

[0003] At present, the execution standards of domestic flame retardant cables are mainly based on GB / T19666-2005 "General Rules for Flame Retardant and Fire Resistant Wires and Cables". Existing submarine cables are mostly applied in the near-shallow sea with a working water depth of less than 45m. The water-blocking conductor of the cable adopts a process design of filling water-blocking materials, while the conductor adopts a process of filling water-blocking materials between each flame retardant layer and the outer sheath, which is difficult to meet the water-blocking requirements of large cross-sections, large water depths and high performance.

[0004] Therefore, how to design a mineral insulated metal sheathed cable and a production method thereof that can solve the above technical problems is a technical problem to be solved. Summary of the Invention

[0005] In order to solve the above problems, the first object of the present invention is to provide a mineral insulated metal sheathed cable to solve the problem that the existing method of only filling water-blocking materials into the cable is difficult to meet the high-performance water-blocking requirements in the far sea and deep sea; the second object of the present invention is to provide a production method of a mineral insulated metal sheathed cable to solve the problems that the submarine cable in the existing production process is heavy and the performance of the production method of the water-blocking material is not good.

[0006] To achieve the first object, the present invention adopts the following technical solutions: including a cable core, a mineral oxygen isolation layer, an inner flame retardant layer, a semiconductor water-blocking tape, a metal strengthening layer, an outer flame retardant layer, a galvanized steel wire outer covering layer and an outer sheath, which are sleeved in sequence from inside to outside;

[0007] The cable core is sequentially sleeved with a water-blocking copper conductor, a mineral insulation layer, a metal sheath and an anti-corrosion plastic layer from inside to outside; the outer periphery of the anti-corrosion plastic layer is sequentially coated with the mineral oxygen isolation layer, the inner flame retardant layer, the semiconductor water-blocking tape, the metal strengthening layer, the outer flame retardant layer, the galvanized steel wire outer covering layer and the outer sheath;

[0008] The number of cores of the cable core is 3;

[0009] The thickness of the mineral insulation layer is 0.5 - 1.7mm;

[0010] The thickness of the anti-corrosion plastic layer is 1.3 - 1.7mm;

[0011] The thickness of the mineral oxygen isolation layer is 1.1 - 1.9 mm;

[0012] The thickness of the inner flame retardant layer is 1.3 - 1.7 mm;

[0013] The thickness of the semiconductor water blocking tape is 2.0 - 3.0 mm;

[0014] The thickness of the metal strengthening layer is 1.3 - 1.9 mm;

[0015] The thickness of the outer flame retardant layer is 1.3 - 1.7 mm;

[0016] The thickness of the galvanized steel wire outer sheath layer is 4.0 - 5.0 mm;

[0017] The thickness of the outer sheath is 1.9 - 3.7 mm.

[0018] Furthermore, the material of the water blocking copper conductor is copper;

[0019] The material of the mineral insulation layer is refractory mica;

[0020] The material of the anti-corrosion plastic layer is polyethylene or cross-linked polyethylene;

[0021] The material of the mineral oxygen isolation layer is a mixture of perlite, magnesium hydroxide and graphite;

[0022] The material of the inner flame retardant layer is a low-smoke and halogen-free flame retardant material.

[0023] To achieve the above-mentioned second object, the present invention adopts the following technical solutions:

[0024] Step 1: Wind the mineral insulation material around the outer layer of the water blocking copper conductor to form a mineral insulation layer;

[0025] Step 2: Continuously extrude aluminum metal around the outer periphery of the mineral insulation layer to form an aluminum metal sheath;

[0026] Step 3: Extrude the anti-corrosion plastic around the outer side of the aluminum metal sheath to form an anti-corrosion plastic layer;

[0027] Step 4: Twist 3 water blocking copper conductors coated with mineral insulation material, metal sheath and anti-corrosion plastic layer into a cable core, and then extrude the mineral oxygen isolation material around the outer side of the anti-corrosion plastic layer to form an oxygen isolation layer;

[0028] Step 5: On the outer periphery of the mineral oxygen isolation layer, form an inner flame retardant layer by overlapping winding with a flame retardant tape;

[0029] Step 6: Extrude the conductor water blocking material around the outer side of the inner flame retardant layer and make it form a semiconductor water blocking tape through on-line curing;

[0030] Step 7: Weave with metal wires outside the semiconductor water-blocking tape to form a metal reinforcement layer;

[0031] Step 8: Overlap and wrap the outside of the metal reinforcement layer with a flame-retardant ceramic silicone rubber tape to form an outer flame-retardant layer;

[0032] Step 9: Wrap the outside of the outer flame-retardant layer with galvanized steel wire armor to form a galvanized steel wire outer sheath;

[0033] Step 10: Extrude a low-smoke and halogen-free flame-retardant material outside the galvanized steel wire outer sheath to form a low-smoke and halogen-free flame-retardant outer sheath.

[0034] Among them, in Step 1, the mineral insulation material is refractory mica;

[0035] Among them, in Step 1, the thickness of the mineral insulation layer is 0.5 - 1.7 mm.

[0036] Among them, in Step 2, the extrusion is carried out by an extruder, and a feed guide plate and a cavity are installed on the die holder of the extruder;

[0037] Among them, in Step 2, the temperature of the extrusion is 480 - 530 °C.

[0038] Among them, in Step 3, the anti-corrosion plastic is polyethylene or cross-linked polyethylene;

[0039] Among them, in Step 3, the extrusion is carried out by a 90-type extruder;

[0040] Among them, in Step 3, the extrusion needs to go through the temperatures of at least seven temperature zones in sequence, which are 170 - 175 °C, 175 - 180 °C, 180 - 185 °C, 185 - 190 °C, 190 - 195 °C, 195 - 200 °C.

[0041] Among them, in Step 4, the extrusion is carried out in a cold extrusion manner;

[0042] Among them, in Step 4, the thickness of the mineral oxygen isolation layer is 1.1 - 1.9 mm;

[0043] Among them, in Step 4, the mineral oxygen isolation material is a mixture of perlite, magnesium hydroxide and graphite.

[0044] Among them, in Step 5, the thickness of the inner flame-retardant layer is 1.3 - 1.7 mm;

[0045] Among them, in Step 5, the flame-retardant tape is made of a low-smoke and halogen-free flame-retardant material.

[0046] Among them, in Step 6, the conductor water-blocking material is made of a polymer conductive material;

[0047] Among them, in step six, after the operation step of extruding the conductor water-blocking material, the conductor water-blocking material is subjected to on-line curing treatment;

[0048] Among them, in step six, the thickness of the semiconductor water-blocking tape is 2.0 - 3.0 mm.

[0049] Among them, in step six, the on-line curing treatment is carried out according to the following steps: adjust and control the temperature of the heating oven equipment at 65 - 75 °C, and the on-line curing is to place it in the oven at 65 - 75 °C for 168 hours.

[0050] Among them, in step seven, the metal wire is a stainless steel wire or a copper wire;

[0051] Among them, in step seven, the thickness of the metal strengthening layer is 1.3 - 1.9 mm;

[0052] Among them, in step seven, the diameter of the metal wire is 0.6 - 1.0 mm.

[0053] Among them, in step eight, the thickness of the outer flame-retardant layer is 1.3 - 1.7 mm.

[0054] Among them, in step nine, the thickness of the galvanized steel wire outer sheath is 4.0 - 5.0 mm;

[0055] Among them, in step nine, the galvanized steel wire is armored by a cradle type untwisting pay-off device, and the cradle rotates 360° within each armor pitch, so that the rotation angle of the wire direction within each pitch is 10°.

[0056] Among them, in step ten, the extrusion is carried out by a 120-type extruder;

[0057] Among them, in step ten, the low-smoke and halogen-free flame-retardant material is a polyolefin material;

[0058] Among them, in step ten, the thickness of the outer sheath is 1.9 - 3.7 mm.

[0059] The present invention has the following beneficial effects:

[0060] 1 - In the present invention, the conductor water-blocking material is extruded outside the inner flame-retardant layer and is made into a semiconductor water-blocking tape through on-line curing. When the fire-resistant cable is used under the sea, after the on-line curing of the conductor water-blocking material, it has good adhesion, strong thermal stability and excellent water-blocking performance. Through the water seepage test verification, the water seepage distance of the conductor is less than 1 m after 10 days under the water pressure of 5 MPa, meeting the requirements of high-performance water-blocking under large water depth projects.

[0061] 2. In the present invention, galvanized steel wires are sheathed outside the conductor. The galvanized steel wires are sheathed by a cradle-type untwisting pay-off device. Within each sheathing pitch, the cradle rotates 360°, so that the wire direction rotates by 10° within each pitch. On the one hand, the stress value of the galvanized steel wire at 0.5% strain is selected, which has a sufficient safety margin and a more reasonable working tension. On the other hand, the weight of the submarine cable is reduced and the mechanical properties of the submarine cable are improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0062] Figure 1 It is a schematic diagram of the present invention.

[0063] Description of the reference numerals in the drawings:

[0064] 1 - Cable core, 11 - Water-blocking copper conductor, 12 - Mineral insulation layer, 13 - Metal sheath, 14 - Anti-corrosion plastic layer;

[0065] 2 - Mineral oxygen isolation layer;

[0066] 3 - Inner flame retardant;

[0067] 4 - Semiconductor water-blocking tape;

[0068] 5 - Metal strengthening layer;

[0069] 6 - Outer flame retardant layer;

[0070] 7 - Galvanized steel wire outer covering;

[0071] 8 - Outer sheath. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0072] The present invention will be further described in detail below with reference to the drawings and specific embodiments:

[0073] Embodiment 1

[0074] See Figure 1 As shown, this solution includes a cable core 1, a mineral oxygen isolation layer 2, an inner flame retardant layer 3, a semiconductor water-blocking tape 4, a metal strengthening layer 5, an outer flame retardant layer 6, a galvanized steel wire outer covering 7, and an outer sheath 8, which are sleeved in sequence from the inside to the outside;

[0075] The cable core 1 is sequentially sleeved with a water-blocking copper conductor 11, a mineral insulation layer 12, a metal sheath 13, and an anti-corrosion plastic layer 14 from the inside to the outside; the outer periphery of the anti-corrosion plastic layer 14 is sequentially coated with the mineral oxygen isolation layer 2, the inner flame retardant layer 3, the semiconductor water-blocking tape 4, the metal strengthening layer 5, the outer flame retardant layer 6, the galvanized steel wire outer covering 7, and the outer sheath 8. The number of cores of the cable core 1 is 3 cores;

[0076] The preparation method of this embodiment includes the following steps:

[0077] Step 1: Strands the water-blocking copper conductor 11 into a metal conductor, and then wraps a refractory mica tape around its outer side to form a mineral insulation layer 12, where the thickness of the mineral insulation layer 12 is 0.5 - 1.7 mm;

[0078] Step 2: Continuously extrudes aluminum metal around the outer periphery of the mineral insulation layer 12 to form an aluminum metal sheath 13;

[0079] Step 3: Extrudes anticorrosive plastic around the outer side of the aluminum metal sheath 13 using a 90-type extruder to form an anticorrosive plastic layer; among them, the extrusion needs to go through the temperatures of at least seven temperature zones in sequence, which are 170 - 175 °C, 175 - 180 °C, 180 - 185 °C, 185 - 190 °C, 190 - 195 °C, 195 - 200 °C, and the thickness of the anticorrosive plastic layer 14 is 1.3 - 1.7 mm;

[0080] Step 4: Strands 3 water-blocking copper conductors 11 coated with mineral insulation material, metal sheath 13, and anticorrosive plastic layer into a cable core 1 to keep the surface of the cable core flat; then uses the cold extrusion method to extrude the mineral oxygen barrier material around the outer side of the anticorrosive plastic layer to form an oxygen barrier layer, and the thickness of the mineral oxygen barrier layer 2 is 1.1 - 1.9 mm;

[0081] Step 5: Overlappingly wraps an inner flame-retardant layer 3 around the outer periphery of the mineral oxygen barrier layer 2; among them, the thickness of the inner flame-retardant layer 3 is 1.3 - 1.7 mm.

[0082] Step 6: Extrudes the conductor water-blocking material around the outer side of the inner flame-retardant layer 3 and forms a semiconductor water-blocking tape 4 through on-line curing; after the operation step of extruding the conductor water-blocking material, the conductor water-blocking material is subjected to on-line curing treatment, where the on-line curing treatment is carried out according to the following steps: adjusts and controls the temperature of the heating oven equipment at 65 - 75 °C, and the on-line curing is to place it in an oven at 65 - 75 °C for 168 hours, and the thickness of the semiconductor water-blocking tape 4 is 2.0 - 3.0 mm.

[0083] Step 7: Weaves with metal wires around the outer side of the semiconductor water-blocking tape 4 to form a metal reinforcement layer 5 to make the cable have an anti-impact function, where the thickness of the metal reinforcement layer 5 is 1.3 - 1.9 mm;

[0084] Step 8: Overlappingly wraps an outer flame-retardant layer 6 with a flame-retardant ceramic silicone rubber tape around the outer side of the metal reinforcement layer 5, where the thickness of the outer flame-retardant layer 6 is 1.3 - 1.7 mm;

[0085] Step 9: Wrap the outer flame-retardant layer 6 with galvanized steel wire armor to form a galvanized steel wire outer sheath 7. Among them, the galvanized steel wire is armored by a cradle-type untwisting pay-off device, and rotates 360° in the cradle direction within each armor pitch, so that the rotation angle of the wire direction within each pitch is 10°. Among them, the thickness of the galvanized steel wire outer sheath 7 is 4.0 - 5.0 mm;

[0086] Step 10: Extrude a low-smoke and halogen-free flame-retardant material on the outside of the galvanized steel wire outer sheath 7 to form a low-smoke and halogen-free flame-retardant outer sheath 8.

[0087] When the fire-resistant cable of this embodiment is used underwater, it has excellent water-blocking performance. Through the water seepage test, it is verified that the seepage distance of the conductor is less than 1 m after 10 days under a water pressure of 5 MPa, meeting the requirements of high-performance water-blocking under deep-water engineering; at the same time, galvanized steel wires are armored outside the conductor. On the one hand, the stress value of the galvanized steel wire at 0.5% strain is selected, with a sufficient safety margin and a more reasonable working tension. On the other hand, the weight of the submarine cable is reduced, and the mechanical properties of the submarine cable are improved.

[0088] Embodiment 2

[0089] The production method of the mineral insulated metal sheath 13 cable of this embodiment includes the following steps:

[0090] Step 1: Wrap the mineral insulating material around the outer layer of the water-blocking copper conductor 11 to form a mineral insulating layer 12;

[0091] Step 2: Continuously extrude aluminum metal around the outer circumference of the mineral insulating layer 12 to form an aluminum metal sheath 13;

[0092] Step 3: Extrude the anti-corrosion plastic on the outside of the aluminum metal sheath 13 to form an anti-corrosion plastic layer;

[0093] Step 4: Strands 3 water-blocking copper conductors 11 wrapped with mineral insulating materials, metal sheaths 13, and anti-corrosion plastic layers into a cable core 1, and then extrude the mineral oxygen-isolating material on the outside of the anti-corrosion plastic layer to form an oxygen-isolating layer;

[0094] Step 5: Overlap and wrap the inner flame-retardant layer 3 around the outer circumference of the mineral oxygen-isolating layer 2 through a flame-retardant tape;

[0095] Step 6: Extrude the conductor water-blocking material on the outside of the inner flame-retardant layer 3 and make it form a semiconductor water-blocking tape 4 through on-line curing;

[0096] Step 7: Weave metal wires on the outside of the semiconductor water-blocking tape 4 to form a metal strengthening layer 5;

[0097] Step 8: Overlap and wrap the outer flame-retardant layer 6 around the outside of the metal strengthening layer 5 through a flame-retardant ceramic silicone rubber tape;

[0098] Step Nine: Wrap the outer flame-retardant layer 6 with galvanized steel wire armor to form a galvanized steel wire outer sheath 7;

[0099] Step Ten: Extrude a low-smoke and halogen-free flame-retardant material on the outside of the galvanized steel wire outer sheath 7 to form a low-smoke and halogen-free flame-retardant outer sheath 8.

[0100] In Step One, the mineral insulating material is refractory mica;

[0101] In Step One, the thickness of the mineral insulating layer 12 is 0.5 - 1.7 mm.

[0102] In Step Two, the extrusion is carried out using an extruder, and a feed guide plate and a cavity are installed on the die base of the extruder;

[0103] In Step Two, the temperature of the extrusion is 480 - 530 °C.

[0104] In Step Three, the anti-corrosion plastic is polyethylene or cross-linked polyethylene;

[0105] In Step Three, the extrusion is carried out using a 90-type extruder;

[0106] In Step Three, the extrusion needs to go through the temperatures of at least seven temperature zones in sequence, which are 170 - 175 °C, 175 - 180 °C, 180 - 185 °C, 185 - 190 °C, 190 - 195 °C, 195 - 200 °C.

[0107] In Step Four, the extrusion is carried out in a cold extrusion manner;

[0108] In Step Four, the thickness of the mineral oxygen isolation layer 2 is 1.1 - 1.9 mm;

[0109] In Step Four, the mineral oxygen isolation material is a mixture of perlite, magnesium hydroxide and graphite.

[0110] In Step Five, the thickness of the inner flame-retardant layer 3 is 1.3 - 1.7 mm;

[0111] In Step Five, the flame-retardant tape is made of a low-smoke and halogen-free flame-retardant material.

[0112] In Step Six, the conductor water-blocking material is made of a polymer conductive material;

[0113] In Step Six, after the operation step of extruding the conductor water-blocking material, the conductor water-blocking material is subjected to an on-line curing treatment;

[0114] In Step Six, the thickness of the semiconductor water-blocking tape 4 is 2.0 - 3.0 mm.

[0115] In Step 6, the on-line curing process is carried out according to the following steps: adjust and control the temperature of the heating oven equipment to 65-75°C, and the on-line curing is to place it in the oven at 65-75°C for 168 hours.

[0116] In Step 7, the metal wire is stainless steel wire or copper wire;

[0117] In Step 7, the thickness of the metal reinforcement layer 5 is 1.3-1.9 mm;

[0118] In Step 7, the diameter of the metal wire is 0.6-1.0 mm.

[0119] In Step 8, the thickness of the outer flame-retardant layer 6 is 1.3-1.7 mm.

[0120] In Step 9, the thickness of the galvanized steel wire outer sheath 7 is 4.0-5.0 mm;

[0121] In Step 9, the galvanized steel wire is armored by a cradle-type untwisting pay-off device, and rotates 360° in the cradle direction within each armor pitch, so that the rotation angle of the wire direction within each pitch is 10°.

[0122] In Step 10, the extrusion is carried out by a 120-type extruder;

[0123] In Step 10, the low-smoke and halogen-free flame-retardant material is a polyolefin material;

[0124] In Step 10, the thickness of the outer sheath 8 is 1.9-3.7 mm.

[0125] The above are only the specific embodiments of the present invention, and do not limit the patent scope of the present invention. Any equivalent structural transformation made by using the content of the specification and drawings of the present invention, or directly or indirectly applied in other related technical fields, shall be included in the patent protection scope of the present invention by the same token.

Claims

1. A mineral insulated metal sheathed cable, characterized in that: It comprises a cable core (1), a mineral oxygen-isolating layer (2), an inner flame-retardant (3) layer, a semiconductor water-blocking tape (4), a metal reinforcement layer (5), an outer flame-retardant layer (6), a galvanized steel wire outer layer (7) and an outer sheath (8) which are sequentially sheathed from the inside to the outside; The cable core (1) is sheathed with a water-blocking copper conductor (11), a mineral insulation layer (12), a metal sheath (13) and an anti-corrosion plastic layer (14) in sequence from the inside to the outside; the outer periphery of the anti-corrosion plastic layer (14) is sheathed with the mineral oxygen-isolating layer (2), the inner flame-retardant (3) layer, the semiconductor water-blocking tape (4), the metal reinforcement layer (5), the outer flame-retardant layer (6), the galvanized steel wire outer layer (7) and the outer sheath (8) in sequence; The number of cores of the cable core (1) is 3; The thickness of the mineral insulation layer (12) is 0.5-1.7 mm; The thickness of the anti-corrosion plastic layer (14) is 1.3-1.7 mm; The thickness of the mineral oxygen-isolating layer (2) is 1.1-1.9 mm; The thickness of the inner flame retardant (3) layer is 1.3-1.7 mm; The thickness of the semiconductor water-blocking tape (4) is 2.0-3.0 mm; The thickness of the metal reinforcement layer (5) is 1.3-1.9 mm; The thickness of the outer flame retardant layer (6) is 1.3-1.7 mm; The thickness of the galvanized steel wire outer layer (7) is 4.0-5.0 mm; The thickness of the outer sheath (8) is 1.9-3.7 mm.

2. A mineral insulated metal sheathed (13) cable according to claim 1, characterized in that: the material of the water-blocking copper conductor (11) is copper; The material of the mineral insulation layer (12) is refractory mica; The material of the anti-corrosion plastic layer (14) is polyethylene or cross-linked polyethylene; The material of the mineral oxygen-isolating layer (2) is a mixture of perlite, magnesium hydroxide and graphite; The material of the inner flame retardant (3) layer is low-smoke halogen-free flame retardant material.

3. A method for producing a mineral insulated metal sheathed cable according to any one of claims 1 to 2, characterized in that: It includes the following steps: Step 1: Wrapping a mineral insulating material around the outer layer of the water-blocking copper conductor (11) to form a mineral insulating layer (12); Step 2: continuously extruding aluminum metal around the outer periphery of the mineral insulation layer (12) to form an aluminum metal sheath (13); Step 3: Extruding an anti-corrosion plastic onto the outside of the aluminum metal sheath (13) to form an anti-corrosion plastic layer; Step 4: twist three water-blocking copper conductors (11) coated with mineral insulating material, metal sheath (13) and anti-corrosion plastic layer into a cable core (1), and then extrude a mineral oxygen-insulating material on the outside of the anti-corrosion plastic layer to form an oxygen-insulating layer; Step 5: wrapping the outer periphery of the mineral oxygen-isolating layer (2) with a flame-retardant wrapping tape to form an inner flame-retardant layer (3); Step 6: Extruding the conductive water-blocking material onto the outer side of the inner flame-retardant (3) layer, and forming a semiconductor water-blocking tape (4) by online curing; Step 7: Weaving metal wires on the outside of the semiconductor water-blocking tape (4) to form a metal reinforcement layer (5); Step 8: wrapping the outer side of the metal reinforcement layer (5) with a flame retardant ceramic silicone rubber tape to form an outer flame retardant layer (6); Step nine: Wrapping the outer periphery of the outer flame retardant layer (6) with a galvanized steel wire armor to form a galvanized steel wire outer layer (7); Step 10: Extruding a polyolefin material onto the outer side of the galvanized steel wire outer layer (7) to form a polyolefin outer sheath (8).

4. The method for producing a mineral insulated metal sheathed cable according to claim 3, characterized in that: In step 1, the mineral insulating material is a fire-resistant final; In step 1, the thickness of the mineral insulation layer (12) is 0.5-1.7 mm; In step 2, the extrusion is carried out by an extruder, and a feed guide plate and a cavity are installed on the die base of the extruder; In step 2, the extrusion temperature is 480-530°C.

5. The method for producing a mineral insulated metal sheathed cable according to claim 3, characterized in that: In step 3, the anti-corrosion plastic is polyethylene or cross-linked polyethylene; In step 3, the extrusion is carried out using a 90-type extruder; In step 3, the extruded package needs to sequentially experience temperatures in at least seven temperature zones, namely 170-175°C, 175-180°C, 180-185°C, 185-190°C, 190-195°C, and 195-200°C; In step 4, the extrusion bag is cold extruded; In step 4, the thickness of the mineral oxygen barrier layer (2) is 1.1-1.9 mm; In step 4, the mineral oxygen-isolating material is a mixture of perlite, magnesium hydroxide and graphite.

6. The method for producing a mineral insulated metal sheathed cable according to claim 3, characterized in that: In step 5, the thickness of the inner flame retardant (3) layer is 1.3-1.7 mm; In step 5, the flame retardant tape is made of low-smoke halogen-free flame retardant material; In step six, the conductor water-blocking material is made of a polymer conductive material; In step six, after the operation step of extruding the conductor water-blocking material, the conductor water-blocking material is subjected to online curing treatment; In step six, the thickness of the semiconductor water blocking tape (4) is 2.0-3.0 mm.

7. The method for producing a mineral insulated metal sheathed cable according to claim 6, characterized in that: In step six, the online curing treatment is carried out according to the following steps, the temperature of the heating oven equipment is adjusted to 65-75°C, and the online curing is placed in the oven at 65-75°C for 168 hours.

8. The method for producing a mineral insulated metal sheathed cable according to claim 3, characterized in that: In step 7, the metal wire is a stainless steel wire or a copper wire; In step 7, the thickness of the metal reinforcement layer (5) is 1.3-1.9 mm; In step seven, the diameter of the metal wire is 0.6-1.0 mm. In step eight, the thickness of the outer flame retardant layer (6) is 1.3-1.7 mm.

9. The method for producing a mineral insulated metal sheathed cable according to claim 3, characterized in that: In step nine, the thickness of the galvanized steel wire outer layer (7) is 4.0-5.0 mm; In step nine, the galvanized steel wire is armored using a cradle-type back-twisting and wire-paying device, and the cradle direction is rotated 360° within each armoring pitch, so that the rotation angle of the steel wire direction within each pitch is 10°.

10. The method for producing a mineral insulated metal sheathed cable according to claim 3, characterized in that: In step 10, the extrusion is carried out using a 120-type extruder; In step ten, the thickness of the outer sheath (8) is 1.9-3.7 mm.

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