External structure power cable and manufacturing method thereof
By adopting a combined structure of central reinforcement, loose sleeve, insulating wire and shield in the external structure power cable, combined with continuous and spaced distribution of upper concave and lower convex components, the problems of complex structure and slow manufacturing speed in the prior art are solved, and efficient and low-cost cable manufacturing and excellent performance are achieved.
Patent Information
- Application Number
- CN202510142745.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-02-10
- Publication Date
- 2025-04-25
- Estimated Expiration
- Not applicable · inactive patent
AI Technical Summary
In the prior art, the special-shaped components of the external structure power cable have complex structures, slow manufacturing speed, and difficult to form a circle, resulting in waste of materials, increased weight and increased costs.
The structure of central reinforcement, multiple loose sleeves, multiple insulating wires and outer cover is formed by continuous and spaced upper concave parts and lower convex components, forming an integrated semicircular cylinder structure, combining the inner cover and outer cover layer to achieve the forming and protection of the cable.
It achieves simple structure, fast manufacturing speed, and round products, improves space utilization, side pressure resistance and construction efficiency, reduces material consumption and cost, and improves heat dissipation effect.
Smart Images
Figure CN119889774A_ABST
Abstract
Description
Technical Field
[0001] The invention belongs to the technical field of electric power, and in particular discloses an external structure power cable and a manufacturing method thereof. Background Art
[0002] In the prior art, CN118363127A discloses an outdoor cable for communication, which has an optical communication component, a reinforcement, an insulated conductor, and an outer sheath; and a special-shaped component consisting of a substrate and at least two bending plates, each of which is composed of three forming sections connected in sequence. After the special-shaped component is formed, each bending plate forms a cavity with the substrate through the bending of its own forming section, and the substrate forms a central cavity through bending. All cavities are distributed around the periphery of the central cavity, and a receiving space is formed between adjacent cavities; the insulated conductor is located in the receiving space, the optical communication component is located in the cavity, the reinforcement is located in the central cavity, and the outer sheath covers all the insulated conductors and the special-shaped components as a whole. It is formed by bending the special-shaped component consisting of at least two bending plates, and the structure is relatively complex, the manufacturing speed is slow, the product cannot be formed into a circle, or more external materials are required when forming a circle, resulting in waste of materials, increase in deadweight, and increase in cost, which is not conducive to promotion and application, and it is not convenient to form more units. Summary of the invention
[0003] To solve the above problems, the purpose of the present invention is to disclose an external structure power cable and a manufacturing method thereof, which is achieved by adopting the following technical solutions.
[0004] The invention discloses an external structure power cable, comprising a central reinforcement member, a plurality of loose tubes, a plurality of insulating wires and an outer sheath. The loose tubes are composed of a plurality of optical fibers and a tube body. The optical fibers are located in a cavity inside the tube body. The insulating wires are composed of an electric conductor and an insulating layer. The insulating layer is coated on the outside of the electric conductor. The invention is characterized in that: the invention further comprises an accommodating component, the accommodating component is composed of an upper concave component and a lower convex component which are continuously and spacedly distributed. The adjacent upper concave components and lower convex components are connected together. The upper concave components and the lower convex components are both semi-circular cylindrical structures. Before the accommodating component is formed, the upper concave component has an upper concave cavity with an opening facing upward, and the lower convex component has a lower convex cavity with an opening facing downward. After the accommodating component is formed, the bottoms of all the upper concave components are in close contact with the outer edge of the central reinforcement member. The accommodating component is coated on the outside of the central reinforcement member and the head end and the tail end of the accommodating component are combined. The loose tube is located in the lower convex cavity, the insulating wire is located in the upper concave cavity, and the outer sheath covers the accommodating component.
[0005] The above-mentioned external structure power cable is characterized by: it also has an inner protective layer, the inner protective layer covers the accommodating component, and the outer protective layer covers the inner protective layer.
[0006] The above-mentioned external structure power cable is characterized in that after the accommodating component is formed, the tops of the lower convex cavities are on the same circumference.
[0007] The above-mentioned external structure power cable is characterized in that the outer edges of the inner sheath and the outer sheath are both circular.
[0008] The above-mentioned external structure power cable is characterized in that the accommodating component is an integrated structure.
[0009] The above-mentioned external structure power cable is characterized in that the material of the accommodating component is plastic.
[0010] The above-mentioned external structure power cable is characterized in that the materials of the inner sheath and the outer sheath can both be plastic.
[0011] Furthermore, the above-mentioned external structure power cable is characterized in that the inner sheath and the outer sheath are both cross-linked polyethylene insulation materials.
[0012] The above-mentioned external structure power cable is characterized in that the material of the sleeve body is plastic.
[0013] The above-mentioned external structure power cable is characterized in that the material of the conductor is copper or aluminum or copper alloy or aluminum alloy.
[0014] The above-mentioned external structure power cable is characterized in that the material of the insulating wire is plastic.
[0015] The above-mentioned external structure power cable is characterized in that the material of the central reinforcement member is steel wire, aluminum wire, iron wire, copper wire or glass fiber reinforced plastic.
[0016] The above-mentioned external structure power cable is characterized in that the material of the inner sheath can also be glass fiber reinforced plastic tape, mica tape, polyester tape, water-blocking tape, or fire-retardant tape.
[0017] The above-mentioned external structure power cable is characterized in that: before being formed, the bottom of the upper concave part of the accommodating part is on the first plane.
[0018] The above-mentioned external structure power cable is characterized in that: before being formed, the top of the downward convex part of the accommodating part is on the second plane.
[0019] The above-mentioned external structure power cable is characterized in that before being formed, the first plane is parallel to the second plane.
[0020] The above-mentioned external structure power cable is characterized in that: before being formed, the leftmost end of the accommodating component is an upward concave component, and the rightmost end of the accommodating component is a downward convex component.
[0021] The above-mentioned external structure power cable is characterized in that: the insulating wire and the inner sheath are not in contact with each other; the insulating wire and the accommodating component are bonded, either continuously or with gaps.
[0022] The above-mentioned external structure power cable is characterized in that: the loose tube and the central reinforcement member are not in contact; the loose tube and the accommodating component are bonded, either continuously or intermittently; or the lower convex component can clamp the loose tube.
[0023] The manufacturing method of the above-mentioned external structure power cable is as follows: The first step is to take the central reinforcement and pass it through the central hole of the die of the sheath extruder head and through the extruder head; The second step is to take the unformed receiving component and pass it through the preforming die and the extruder head, bend the left edge of the upper concave part at the leftmost end of the receiving component downward, and bend the right edge of the lower convex part at the rightmost end of the receiving component downward, so that it is preformed into an approximate cylinder, and pass it through the middle hole of the die of the sheath extruder head, and the edge hole is located outside the central hole; The third step is to pass the inner sheath through the edge hole of the die of the sheath extruder head and through the extruder head, and the edge hole is located outside the middle layer hole; Step 4: Take the loose tube and insert it into the lower convex cavity, take the insulated wire and insert it into the upper concave cavity, and pass it through the extruder head; The fifth step is to start the vacuum device at the mold entrance of the sheath extruder, start the sheath extruder, extrude the plastic and cover it on the inner sheath to form an outer sheath, and at the front end of the sheath extruder head, pull the central reinforcement, accommodating components, loose tube, insulated wire, inner sheath, and outer sheath through the cooling water tank to form an external structure power cable.
[0024] The present application has the following main beneficial technical effects: simple structure, easy manufacturing, fast manufacturing speed, higher space utilization when the product is round and used for circular pipes, stronger resistance to lateral pressure, high construction efficiency, less material consumption, light weight, low cost, and better heat dissipation effect. BRIEF DESCRIPTION OF THE DRAWINGS
[0025] Figure 1 This is a schematic diagram of the three-dimensional structure after dissection of Example 1.
[0026] Figure 2 for Figure 1 Schematic diagram of the enlarged cross-section structure.
[0027] Figure 3 for Figure 1Schematic diagram of the cross-sectional structure of the central reinforcement and the accommodating component used in.
[0028] Figure 4 for Figure 3 A schematic diagram of the three-dimensional structure of a dissected section of the accommodation component before molding.
[0029] Figure 5 for Figure 4 Schematic diagram of the enlarged cross-section structure.
[0030] Figure 6 It is a schematic diagram of forming a receiving component in implementation example 2.
[0031] Figure 7 This is a schematic diagram of the cross-sectional structure of implementation example 3.
[0032] Figure 8 This is a schematic diagram of the cross-sectional structure of implementation example 4.
[0033] Fig. 9 This is a schematic diagram of the cross-sectional structure of the accommodation component of Example 5 before molding.
[0034] Fig.10 It is a schematic diagram of stacking multiple accommodating components of Example 5 before forming. DETAILED DESCRIPTION
[0035] In order to enable those skilled in the art to better understand and implement this patent, the marks in the drawings are now described in detail in conjunction with the drawings in the specification.
[0036] In the figure: 1-central reinforcement member, 2-accommodating component, 3-loose tube, 4-insulated wire, 5-inner sheath, 6-outer sheath, 31-optical fiber, 32-tube body, 41-electric conductor, 42-insulating layer, 21-upper concave component, 22-lower convex component, 210-upper concave cavity, 220-lower convex cavity.
[0037] Implementation Example 1: Please see Figures 1 to 5, an external structure power cable, comprising a central reinforcement member 1, five loose tubes 3, five insulating wires 4, an inner sheath 5, and an outer sheath 6, wherein the loose tube 3 is composed of a plurality of optical fibers 31 and a tube body 32, wherein the optical fibers 31 are located in a cavity inside the tube body 32, and the insulating wires 4 are composed of an electrical conductor 41 and an insulating layer 42, wherein the insulating layer 42 is coated on the outside of the electrical conductor 41, characterized in that: it also comprises an accommodating component 2, wherein the accommodating component 2 is composed of an upper concave component 21 and a lower convex component 22 which are continuously and spaced apart, wherein adjacent upper concave components 21 and lower convex components 22 are connected together, wherein the upper concave component 21 and the lower convex component 22 are both semicircular cylindrical structures, and before the accommodating component 2 is formed, the upper concave component 21 has an upper concave cavity 210 which opens upward, The lower convex component 22 has a lower convex cavity 220 opening downward. After the accommodating component 2 is formed, the bottoms of all the upper concave components 21 are tightly attached to the outer edge of the central reinforcement 1, the accommodating component 2 is wrapped around the outside of the central reinforcement 1, and the head end and the tail end of the accommodating component 2 are combined; the loose sleeve 3 is located in the lower convex cavity 220, the insulating wire 4 is located in the upper concave cavity 210, the inner sheath 5 covers the accommodating component 2, and the outer sheath 6 covers the inner sheath 5.
[0038] The above-mentioned external structure power cable is characterized in that after the accommodating component 2 is formed, the tops of the lower convex cavities 220 are on the same circumference.
[0039] The above-mentioned external structure power cable is characterized in that the outer edges of the inner sheath 5 and the outer sheath 6 are both circular.
[0040] The above-mentioned external structure power cable is characterized in that the accommodating component 2 is an integrated structure.
[0041] The above-mentioned external structure power cable is characterized in that the material of the accommodating component 2 is plastic.
[0042] The above-mentioned external structure power cable is characterized in that the materials of the inner sheath and the outer sheath can be plastic.
[0043] Furthermore, the above-mentioned external structure power cable is characterized in that the inner sheath and the outer sheath are both cross-linked polyethylene insulation materials.
[0044] The above-mentioned external structure power cable is characterized in that the model of the optical fiber 31 is G.652 or G.653 or G.654 or G.655 or G.656 or G.657 or A1a or A1b or A1c.
[0045] The above-mentioned external structure power cable is characterized in that the material of the sleeve body 32 is plastic.
[0046] The above-mentioned external structure power cable is characterized in that the material of the conductor 41 is copper or aluminum or copper alloy or aluminum alloy.
[0047] The above-mentioned external structure power cable is characterized in that the material of the insulating wire 4 is plastic.
[0048] The above-mentioned external structure power cable is characterized in that the material of the central reinforcement member 1 is steel wire, aluminum wire, iron wire, copper wire or glass fiber reinforced plastic.
[0049] The above-mentioned external structure power cable is characterized in that the material of the inner sheath 5 can also be glass fiber reinforced plastic tape, mica tape, polyester tape, water-blocking tape, or fire-retardant tape.
[0050] The above-mentioned external structure power cable is characterized in that: before being formed, the bottom of the upper concave part 21 of the accommodating part 2 is on the first plane.
[0051] The above-mentioned external structure power cable is characterized in that: before being formed, the top of the downward convex part 22 of the accommodating part 2 is on the second plane.
[0052] The above-mentioned external structure power cable is characterized in that before being formed, the first plane is parallel to the second plane.
[0053] The above-mentioned external structure power cable is characterized in that: before being formed, the leftmost end of the accommodating component 2 is an upward concave component 21, and the rightmost end of the accommodating component 2 is a downward convex component 22.
[0054] The above-mentioned external structure power cable is characterized in that: the insulating wire 4 and the inner sheath 5 are not in contact with each other; the insulating wire 4 and the accommodating component 2 are bonded, either continuously or with gaps.
[0055] The above-mentioned external structure power cable is characterized in that: the loose tube 3 and the central reinforcement member 1 are not in contact; the loose tube 3 and the accommodating component 2 are bonded, either continuously or intermittently; or the lower convex component 22 clamps the loose tube 3.
[0056] The above-described external structure power cable is characterized in that: the number of loose tubes 3 is not limited to five, and the number of insulating wires 4 is not limited to five; it can also be any integer not less than three; after the accommodating component 2 is formed, the number of upper concave components 21 and the number of lower convex components 22 are equal, and the number of loose tubes 3 and the number of insulating wires 4 can be equal to the number of upper concave components 21.
[0057] Implementation Example 2: Please see Figure 6 , and refer to Figures 1 to 5, a method for manufacturing an external structure power cable, characterized in that: The first step is to take the central reinforcement member 1 and pass it through the central hole of the die of the sheath extruder head and through the extruder head; The second step is to take the unformed receiving component 2 and pass it through the preforming die and the extruder head, bend the left edge of the upper concave component 21 at the leftmost end of the receiving component 2 downward, and bend the right edge of the lower convex component 22 at the rightmost end of the receiving component 2 downward, so that it is preformed into an approximate cylinder, and pass it through the middle hole of the die of the sheath extruder head, and the edge hole is located outside the central hole; The third step is to pass the inner sheath 5 through the edge hole of the die of the sheath extruder head and through the extruder head, and the edge hole is located outside the middle layer hole; Step 4: Take the loose tube 3 and insert it into the lower convex cavity 220, take the insulated wire 4 and insert it into the upper concave cavity 210, and pass it through the extruder head; The fifth step is to start the vacuum device at the mold entrance of the sheath extruder, start the sheath extruder, extrude the plastic and cover it on the inner sheath 5 to form an outer sheath 6, and at the front end of the sheath extruder head, pull the central reinforcement 1, the accommodating component 2, the loose tube 3, the insulating wire 4, the inner sheath 5, and the outer sheath 6 through the cooling water tank to form an external structure power cable.
[0058] In the above manufacturing method, the vacuum device ensures that the bottom of the upper concave part 21 at the leftmost end of the accommodating part 2 is close to the outer edge of the central reinforcement 1, and the inner protective layer 5 and the outer protective layer 6 are tightly wrapped and formed. There is cooling water in the cooling water tank, which ensures the rapid shrinkage and shaping of the inner protective layer 5 and the outer protective layer 6, ensuring the stability and reliability of the structure. Furthermore, before the unformed accommodating part 2 passes through the preforming mold and through the extruder head, the left and right ends of the accommodating part 2 can also be heated by electromagnetic or other means to make the two ends more tightly combined during the molding process. In this method, the upper concave part 21 and the lower convex part 22 are accurately positioned by the mold to ensure the stability of the structure.
[0059] In the manufacturing method described above: during manufacturing, the insulating wire 4 and the inner protective layer 5 are not in contact with each other; adhesive is sprayed between the insulating wire 4 and the accommodating component 2 to achieve bonding, so that the insulating wire 4 and the inner protective layer 5 are not in contact with each other.
[0060] In the manufacturing method described above: during manufacturing, adhesive is sprayed between the loose tube 3 and the accommodating component 2 to achieve bonding, so that the loose tube 3 and the central reinforcement member 1 are not in contact; or the lower convex component 22 clamps the loose tube 3, so that the loose tube 3 and the central reinforcement member 1 are not in contact.
[0061] In the manufacturing method described above: the left and right ends of the accommodating component 2 are heated by electromagnetic or other means so that they can be closely attached to the central reinforcement member, thus making the structure stable and preventing the contact between the accommodating component 2 and the central reinforcement member from slipping.
[0062] Implementation Example 3: Please see Figure 7 , and refer to Figures 1 to 6 , an external structure power cable, which is basically the same as implementation example 1, but different in that: the inner sheath 5 is omitted, and the outer sheath 6 is directly covered on the outside of the accommodating component 2.
[0063] Implementation Example 4: Please see Figure 8 , and refer to Figures 1 to 7 , an external structure power cable, is basically the same as embodiment 3, except that: the cross-section of the outer sheath 6 is not circular, but polygonal, preferably a regular polygon, so that the insulating wire 4 can be tangent to the inner edge of the outer sheath 6, so that there is no need to bond the insulating wire 4 and the accommodating component 2, and the structure can be stable.
[0064] Implementation Example 5: Please see Figures 9 and 10 , and refer to Figures 1 to 8 , an external structure power cable, is basically the same as any of the above-mentioned embodiments, except that the number of upper concave parts 21 and lower convex parts 22 is different. Three accommodating parts 2 are illustrated, and before being formed, they are stacked up and down; the upper concave part 21 of the upper layer is stacked on the upper concave part 21 of the lower layer, and the lower convex part 22 of the upper layer is stacked on the lower convex part 22 of the lower layer; of course, the accommodating parts 2 in other embodiments can also be stacked in this way. This method effectively saves space, turns the circle into a straight line, and can be stacked in multiple layers, achieving the purpose of easy storage and easy placement.
[0065] Furthermore, in the present application, a sufficiently wide accommodating component 2 can be made, on which there are a large number of upper concave components 21 and lower convex components 22, and tearing openings that can be torn apart are set at the connections between adjacent upper concave components 21 and lower convex components 22, so that they can be taken and torn as needed, which speeds up the production speed and reduces the inventory specifications of the accommodating component 2.
[0066] The present application overcomes the technical difficulties in the prior art of bending and forming special-shaped parts composed of at least two bending plates, which has a complex structure, slow manufacturing speed, and the product cannot be formed into a circle. When forming a circle, more external materials are required, resulting in material waste, increased dead weight, increased costs, and other technical difficulties. In addition, it can form multi-path power transmission and light transmission; the upper concave cavity and the lower convex cavity formed by the upper concave component 21 and the lower convex component 22 dissipate heat more effectively, are convenient to take and place, and are more convenient for detection and construction, with higher efficiency. Due to better heat dissipation, the power transmission capacity is stronger; since it is a circular structure, the pressure resistance in all directions is more uniform, and the resistance to lateral pressure is stronger.
[0067] As a further improvement, the present application can also be as follows: the loose tube and the insulated wire are interchangeable. If the insulated wire is outside the accommodating component 2, the heat dissipation is better. However, if it is inside the accommodating component 2, since there is also space inside the lower convex cavity 220, it also has an excellent heat dissipation effect. Inside refers to the lower convex cavity 220 being connected to the central reinforcement.
[0068] As a further improvement, the present application can also be as follows: multiple optical fiber ribbons are vertically arranged in the lower convex cavity 220, and in each lower convex cavity 220, multiple optical fiber ribbons are distributed in a stacked manner. The so-called vertical direction means that: the symmetry plane of the lower convex cavity 220 passes through the central axis of the central reinforcement member, and on the cross section of the optical fiber ribbon in the symmetry plane of the lower convex cavity 220 with the optical fiber ribbon, the length of the optical fiber ribbon is parallel to the symmetry plane of the lower convex cavity 220. Of course, some or all of the lower convex cavities 220 can have optical fiber ribbon stacks, which makes more effective use of space. On the cross section of the optical fiber ribbon, one end of the optical fiber ribbon in the length direction contacts the central reinforcement member, and the other end contacts the inner surface or the lower surface of the lower convex portion 22, which makes full use of the space and improves the core density.
[0069] The present application has the following main beneficial technical effects: simple structure, easy manufacturing, fast manufacturing speed, higher space utilization when the product is round and used for circular pipes, stronger resistance to lateral pressure, high construction efficiency, less material consumption, light weight, low cost, and better heat dissipation effect.
[0070] The present application can be used as an intelligent sensor or intelligent sensing element; since it can transmit voice and images, it can also be used as a physical sensor, such as a voice sensor or an image sensor; since the optical fiber transmits optical signals through the principle of total reflection, it can also be used as a distance sensor; the optical fiber in the present application is an optical waveguide itself, so it can be used as an optical waveguide, such as an array optical waveguide or a diffraction optical waveguide; the present application can also be used in the field of optical computing, as part of optical chip computing, in the fields of optical computing, optical computing, and optical network computing.
[0071] The cable in the present application can be an aluminum alloy conductor, so it can be called an aluminum alloy power cable. Due to the effective electrical isolation of the accommodating components, it can transmit very high power levels, so it can also be called a high-voltage or ultra-high-voltage cable. In the present application, since it has optical fiber communication capabilities, it can be used in smart grids. The materials of the inner sheath and / or outer sheath and the materials of the accommodating components can be cross-linked polyethylene insulating materials, so it can also be called a cross-linked polyethylene insulated power cable.
[0072] The above embodiments are only preferred technical solutions of the present invention and should not be regarded as limiting the present invention. The protection scope of the present invention shall be the technical solutions recorded in the claims, including the equivalent replacement solutions of the technical features in the technical solutions recorded in the claims. That is, equivalent replacement improvements within this scope are also within the protection scope of the present invention.
Claims
1. An external structure power cable, comprising a central reinforcement member (1), a plurality of loose tubes (3), a plurality of insulating wires (4), and an outer sheath (6), characterized in that: The container (2) further comprises an accommodating component (2), wherein the accommodating component (2) is composed of upper concave components (21) and lower convex components (22) which are continuously and spaced apart, wherein adjacent upper concave components (21) and lower convex components (22) are connected together, and both the upper concave components (21) and the lower convex components (22) are semi-circular cylindrical structures. Before the accommodating component (2) is formed, the upper concave component (21) has an upper concave cavity (210) which opens upward. The lower convex component (22) has a lower convex cavity (220) opening downward. After the accommodating component (2) is formed, the bottoms of all the upper concave components (21) are tightly attached to the outer edge of the central reinforcement component (1). The accommodating component (2) is wrapped around the outside of the central reinforcement component (1) and the head end and the tail end of the accommodating component (2) are combined. The loose tube (3) is located in the lower convex cavity (220), the insulating wire (4) is located in the upper concave cavity (210), and the outer sheath (6) covers the accommodating component (2).
2. The external structure power cable according to claim 1, characterized in that: It also has an inner protective layer (5), and the inner protective layer (5) is located between the accommodating component (2) and the outer protective layer (6).
3. The external structure power cable according to claim 2, characterized in that: The accommodating component (2) is an integrated structure.
4. The external structure power cable according to claim 3, characterized in that: After the accommodating component (2) is formed, the top of the lower convex cavity (220) is on the same circumference; and the outer edges of the inner protective layer (5) and the outer protective layer (6) are both circular.
5. The external structure power cable according to claim 4, characterized in that: Before molding, the bottom of the upper concave part (21) of the accommodating part (2) is on the first plane.
6. The external structure power cable according to claim 5, characterized in that: Before forming, the top of the lower convex part (22) of the accommodating part (2) is on the second plane; the first plane is parallel to the second plane.
7. The external structure power cable according to claim 6, characterized in that: Before forming, the leftmost end of the accommodating component (2) is an upward concave component (21), and the rightmost end of the accommodating component (2) is a downward convex component (22).
8. The external structure power cable according to claim 7, characterized in that: The insulating wire (4) and the inner protective layer (5) are not in contact with each other; the insulating wire (4) and the accommodating component (2) are bonded together, and the bonding is continuous or intermittent bonding.
9. The external structure power cable according to claim 8, characterized in that: The loose tube (3) and the central reinforcement member (1) are not in contact with each other; the loose tube (3) and the accommodating component (2) are bonded together, and the bonding is continuous or intermittent bonding; or the lower convex component (22) clamps the loose tube (3).
10. An external structure power cable according to any one of claims 1 to 9, characterized in that: The manufacturing method is: The first step is to take the central reinforcement member (1) and pass it through the central hole of the die of the sheath extruder head and through the extruder head; The second step is to take the unformed receiving component (2) and pass it through the preforming die and the extruder head, bend the left edge of the upper concave component (21) at the leftmost end of the receiving component (2) downward, and bend the right edge of the lower convex component (22) at the rightmost end of the receiving component (2) downward, so that it is preformed into an approximate cylinder, and pass it through the middle hole of the die of the sheath extruder head, with the edge hole located outside the central hole; The third step is to pass the inner protective layer (5) through the edge hole of the die of the sheath extruder head and through the extruder head, wherein the edge hole is located outside the middle layer hole; Step 4: Take the loose tube (3) and insert it into the lower convex cavity (220), take the insulating wire (4) and insert it into the upper concave cavity (210), and pass it through the extruder head; In the fifth step, a vacuum device is turned on at the mold entrance of the sheath extruder, and the sheath extruder is turned on to extrude plastic and cover the plastic on the inner sheath (5) to form an outer sheath (6). At the front end of the sheath extruder head, the central reinforcement member (1), the accommodating member (2), the loose tube (3), the insulating wire (4), the inner sheath (5), and the outer sheath (6) are pulled together through the cooling water tank to form an external structure power cable.