Optical cable, production mold and preparation method

Abstract

The invention discloses an optical cable, a production mold and a preparation method, and relates to the technical field of optical fiber cables, the optical cable comprises a loose tube, at least two cable cores, a first armor layer, a plurality of reinforcing wires, an insulation shielding layer and an outer sheath, the at least two cable cores are arranged in the loose tube and are symmetrically distributed along the central axis of the loose tube, and the first armor layer is arranged in the loose tube. The cross section of the first armor layer is in an equilateral triangle shape and is sleeved outside the loose tube, the insulation shielding layer is sleeved outside the first armor layer, the outer sheath is sleeved outside the insulation shielding layer, the plurality of reinforcing wires are located between the first armor layer and the insulation shielding layer, and the triangular stainless steel band is used for armoring, so that the compression resistance and shock resistance of the optical cable are greatly enhanced. And the cable core is wrapped by the insulation shielding layer, so that the optical cable has stronger lightning protection capability while having stronger side pressure resistance and tensile property.

Description

Technical Field

[0001] The present invention relates to the field of optical fiber cables, and more specifically, to a pressure-resistant, shock-resistant, and lightning-proof optical cable. Furthermore, the present invention relates to a production mold for molding the optical cable and a method for preparing the optical cable. Background Art

[0002] After decades of development, the optical cable industry has developed relatively mature structures and processes. Among them, stranded, central tube, and skeleton cable structures are the most widely produced and used. Each of these structures has its own advantages and characteristics. Natural disasters such as earthquakes and lightning often wreak devastating damage on communication lines. Although optical fiber itself is insulated and non-conductive, optical cables often have metal reinforcements, such as steel wire or other metal materials, to increase their strength. If struck by lightning, these metal components can introduce strong currents, causing equipment damage or fire. Furthermore, lightning can indirectly affect optical cables through nearby metal pipes and wires, necessitating lightning protection measures. Optical cables are typically laid underground, overhead, or alongside buildings. Earthquakes and vibrations can cause cables to break, bend, or bend excessively, impacting signal transmission. Especially in earthquake-prone areas, earthquake resistance can reduce the risk of damage to optical cables.

[0003] Among the current structures of stranded optical cables, the structure of large-core optical cables is relatively simple and is subject to structural limitations. The cost is often high, the cable outer diameter is large, and the optical cable has poor seismic and compressive resistance.

[0004] In summary, how to provide an optical cable with multi-layer protection and a large optical fiber bending angle is an urgent problem to be solved by those skilled in the art. Summary of the Invention

[0005] In view of this, the purpose of the present invention is to provide an optical cable with a multi-layer protective structure to improve the compression and shock resistance of the cable. At the same time, the optical cable has a large bending angle and is more adaptable.

[0006] Another object of the present invention is to provide a production mold for the above-mentioned optical cable, which can quickly form the first armor layer and wrap the cable core.

[0007] Another object of the present invention is to provide a preparation method for the above-mentioned optical cable production.

[0008] In order to achieve the above object, the present invention provides the following technical solutions:

[0009] An optical cable comprising:

[0010] Loose tube,

[0011] At least two cable cores, wherein the at least two cable cores are arranged in the loose tube and symmetrically distributed along the central axis of the loose tube;

[0012] a first armor layer, wherein the cross section of the first armor layer is an equilateral triangle and is sleeved on the outside of the loose tube;

[0013] an insulating shielding layer and an outer sheath, wherein the insulating shielding layer is sleeved on the outside of the first armor layer, and the outer sheath is sleeved on the outside of the insulating shielding layer;

[0014] A plurality of reinforcing wires are located between the first armor layer and the insulating shielding layer.

[0015] The present invention further includes:

[0016] The second armor layer has a circular cross section and coincides with the center axis of the loose tube. The second armor layer is located between the insulating shielding layer and the first armor layer.

[0017] Furthermore, the present invention provides that the plurality of reinforcing wires are respectively located outside three sides of the first armor layer, and none of the reinforcing wires are in contact with the first armor layer and the second armor layer.

[0018] Furthermore, the present invention provides that an elastic water-blocking material is filled between the first armor layer and the second armor layer.

[0019] Furthermore, the present invention is arranged coaxially with the second armor layer, and the outer wall of the loose tube is in contact with the inner wall of the first armor layer.

[0020] Furthermore, in the present invention, aramid is filled between the first armor layer and the loose tube.

[0021] Furthermore, the present invention provides that the loose tube is filled with optical fiber paste.

[0022] A production mold comprises a mold body, wherein the mold body is used to form the first armor layer into an equilateral triangle structure.

[0023] Furthermore, the present invention provides a discharge end and a feed end at both ends of the mold body, and a forming hole is formed through the mold body, and the discharge end is an equilateral triangle structure;

[0024] Also includes:

[0025] The sleeve is located in the forming hole and is used to allow the cable core to pass through the mold body.

[0026] A preparation method, applied to any of the above-mentioned optical cables:

[0027] The optical fiber bundles are dyed through a coloring process and bundled into a cable core;

[0028] Sheathing at least two groups of cable cores with loose tubes through the sheathing process;

[0029] Fill the loose tube with fiber paste;

[0030] The steel strip is placed in the forming hole of the mold body, and the loose tube filled with fiber paste is inserted into the sleeve of the mold body, so that the first armor layer is sleeved on the outside of the loose tube;

[0031] Aramid is filled in the first armor layer;

[0032] Arranging a plurality of reinforcing wires outside the first armor layer;

[0033] Passing the steel strip through a die to form a second armor layer and sheathing it on the outside of the first armor layer;

[0034] Filling elastic water-blocking material between the first armor layer and the second armor layer;

[0035] Wrapping the insulating shielding material around the outside of the second armor layer by a wrapping machine to form an insulating shielding layer;

[0036] The cable core with the insulating shielding layer is formed into an outer sheath through an extruder to form a finished optical cable.

[0037] The optical cable provided by the present invention, when in use, disperses the optical fibers forming the cable core and forms at least two cable cores, thereby reducing the bending strain of the optical fibers when the cable is bent under stress, thereby minimizing the bending performance of the optical cable as a whole. The cross-section of the first armor layer is an equilateral triangle and is sleeved on the outside of the loose tube. The triangle has strong stability. Therefore, under the action of the first armor layer, the stability of the optical cable can be effectively improved, so that it has sufficient lateral pressure resistance and greatly increases the service life of the optical cable. The insulating shielding layer is sleeved on the outside of the first armor layer, so that the optical cable can more effectively protect the internal cable core from the influence of lightning factors when encountering lightning, thereby making the optical cable have a strong lightning protection effect. The outer sheath is sleeved on the outside of the insulating shielding layer, and the outer sheath makes the optical cable have better wear resistance. A plurality of reinforcing wires are located between the first armor layer and the insulating shielding layer. The plurality of reinforcing wires are used to enhance the excellent tensile strength of the optical cable, so that the optical cable can be more resistant to tension when encountering earthquake disasters.

[0038] The present invention also provides a production mold for quickly molding the first armor layer and wrapping the cable core.

[0039] The present invention also provides a preparation method for producing the above optical cable. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in 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 merely embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying any creative work.

[0041] Figure 1 This is a schematic structural diagram of the cable cross section provided by the present invention;

[0042] Figure 2 This is a schematic structural diagram of the axial side of the mold body provided by the present invention;

[0043] Figure 3 This is a schematic structural diagram of the side cross-section of the mold body provided by the present invention;

[0044] Figure 4 This is a schematic structural diagram of the feed end section of the mold body provided by the present invention;

[0045] Figure 5 This is a schematic structural diagram of a cross-section at a first position in the middle of the mold body provided by the present invention;

[0046] Figure 6 This is a schematic structural diagram of the second cross-section in the middle of the mold body provided by the present invention;

[0047] Figure 7 This is a structural schematic diagram of the cross-section of the discharge end of the mold body provided by the present invention.

[0048] Figure 1-Figure 7 , the reference numerals include:

[0049] 1. Outer sheath; 2. Insulation shielding layer; 3. Second armor layer; 4. Elastic water-blocking material; 5. Reinforcement wire; 6. Cable core; 7. Optical fiber paste; 8. Loose tube; 9. First armor layer; 10. Discharge end; 11. Mold body; 12. Sleeve; 13. Forming hole. DETAILED DESCRIPTION

[0050] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only 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 making creative efforts are within the scope of protection of the present invention.

[0051] The core of the present invention is to provide an optical cable with a multi-layer protective structure to improve the cable's compression and shock resistance. At the same time, the optical cable has a large bending angle and is more adaptable.

[0052] Another core of the present invention is to provide a production mold for the above-mentioned optical cable, which can quickly form the first armor layer and wrap the cable core.

[0053] Another core of the present invention is to provide a preparation method for the above-mentioned optical cable production.

[0054] Please refer to Figure 1 An optical cable comprises at least two cable cores 6, a first armor layer 9, a plurality of reinforcing wires 5, an insulating shielding layer 2 and an outer sheath 1. The at least two cable cores 6 are symmetrically distributed along the central axis of the optical cable. A loose tube 8 is provided on the outside of the at least two cable cores 6. The cross-section of the first armor layer 9 is an equilateral triangle and is sleeved on the outside of the loose tube 8. The insulating shielding layer 2 is sleeved on the outside of the first armor layer 9. The outer sheath 1 is sleeved on the outside of the insulating shielding layer 2. The plurality of reinforcing wires 5 are located between the first armor layer 9 and the insulating shielding layer 2.

[0055] It should be noted that, in the embodiment of the present invention, the number of cable cores 6 can be selected according to actual use. For example, four cable cores 6 can be selected and evenly distributed around the axis of the optical cable. Three cable cores 6 can also be used and evenly distributed around the axis of the optical cable. At the same time, the three cable cores 6 are arranged corresponding to the three corners of the first armor layer 9, which can further enhance the support strength of the cable core 6 and prevent the first armor layer 9 from squeezing the cable core 6 when deformed.

[0056] Optionally, in some embodiments, the reinforcing wire 5 is made of phosphated steel or glass fiber, and the diameter of the reinforcing wire 5 can be determined according to usage.

[0057] Optionally, in some embodiments, the first armor layer 9 may also adopt other shapes, such as circular, hexagonal, or quadrilateral.

[0058] Optionally, in some embodiments, the number of reinforcing wires 5 can be determined according to usage. Specifically, the number of reinforcing wires 5 is a multiple of three and is evenly distributed on the three sides of the first armor layer 9 of the equilateral triangle. For example, if the number of reinforcing wires 5 is three, one reinforcing wire 5 is provided on each side of the first armor layer 9. If the number of reinforcing wires 5 is six, two reinforcing wires 5 are provided on each side of the first armor layer 9.

[0059] During use, the optical fibers forming the cable core 6 are dispersed and at least two cable cores 6 are formed, so as to reduce the bending strain of the optical fibers when the cable is bent under stress, thereby effectively improving the bending performance of the optical cable as a whole. The cross-section of the first armor layer 9 is an equilateral triangle, and is sleeved on the outside of the loose tube 8. The triangle has strong stability. Therefore, under the action of the first armor layer 9, the stability of the optical cable can be effectively improved, so that it has sufficient lateral pressure resistance, which greatly increases the service life of the optical cable. The insulating shielding layer 2 is sleeved on the outside of the first armor layer 9, so that the optical cable can more effectively protect the internal cable core 6 from the influence of lightning factors when encountering lightning, thereby making the optical cable have a stronger lightning protection effect. The outer sheath 1 is sleeved on the outside of the insulating shielding layer 2, and the outer sheath 1 makes the optical cable have better wear resistance. Several reinforcing wires 5 are located between the first armor layer 9 and the insulating shielding layer 2. Several reinforcing wires 5 are used to enhance the optical cable to have excellent tensile strength, so that the optical cable can be more resistant to tension when encountering an earthquake disaster.

[0060] Please refer to Figure 1 In some embodiments, a second armor layer 3 is further included. The cross-section of the second armor layer 3 is circular and coincides with the center axis of the optical cable. The second armor layer 3 is located between the insulating shielding layer 2 and the first armor layer 9. That is to say, by adding the second armor layer 3, on the one hand, the compressive and seismic resistance of the optical cable is further enhanced, and on the other hand, the circular structure of the second armor layer 3 can improve the overall roundness of the optical cable.

[0061] Optionally, in some embodiments, the first armor layer 9 and the second armor layer 3 are both made of stainless steel strips.

[0062] Optionally, in some embodiments, in order to further improve the compressive performance of the optical cable, three support belts extending along the axial direction of the optical cable are arranged between the first armor layer 9 and the second armor layer 3, and the two sides of the support belts are respectively in contact with the first armor layer 9 and the second armor layer 3. Therefore, under the action of the support belts, the compressive performance of the optical cable can be further improved.

[0063] Optionally, in some embodiments, the second armor layer 3 may also adopt a hexagonal structure, and the three corners of the first armor layer 9 correspond to the midpoints of the three sides of the hexagon, which can further improve its supporting strength.

[0064] Optionally, in some embodiments, the first armor layer 9 does not contact the second armor layer 3. Specifically, a buffer zone is provided between the three top corners of the first armor layer 9 and the second armor layer 3. The buffer zone is made of wear-resistant material to prevent wear caused by direct contact between the two armor layers, which can effectively increase the service life of the optical cable.

[0065] Optionally, in some embodiments, circular arcs are provided on the three top corners of the first armor layer 9. Specifically, the use of circular arcs can increase the contact area and reduce the pressure during release, thereby further reducing its wear.

[0066] Please refer to Figure 1 In some embodiments, several reinforcing wires 5 are respectively located outside three sides of the first armor layer 9, and none of them contacts the first armor layer 9 and the second armor layer 3. That is to say, the positions of the reinforcing wires 5 are limited, and none of the reinforcing wires 5 contacts the first armor layer 9 and the second armor layer 3. This can effectively prevent wear between the reinforcing wires 5 and the first armor layer 9 and the second armor layer 3 when the optical cable is bent, thereby increasing its service life.

[0067] Please continue to refer to Figure 1 In some embodiments, an elastic water-blocking material 4 is filled between the first armor layer 9 and the second armor layer 3. That is to say, the elastic water-blocking material 4 can achieve the purpose of water blocking. At the same time, the interior of the optical cable has a certain elasticity, so that the cable core 6 has sufficient elastic deformation space when the optical cable is under pressure in the event of an earthquake disaster.

[0068] Optionally, in some embodiments, the elastic water-blocking material 4 may be made of water-blocking powder, water-blocking paste, water-blocking yarn, or the like.

[0069] In the above embodiment, the reinforcing wire 5 is not in contact with the first armor layer 9 and the second armor layer 3 through the elastic water-blocking material 4. Therefore, when in use, the elastic water-blocking material 4 can not only improve the elasticity of the optical cable and give it a certain elastic deformation space, but also the reinforcing wire 5 has lower stress when the optical cable is bent under the wrapping of the elastic water-blocking material 4, making the optical cable easier to bend and facilitating the arrangement of the optical cable.

[0070] Please refer to Figure 1 In some embodiments, the loose tube 8 is coaxially arranged with the second armor layer 3, and the outer wall of the loose tube 8 contacts the inner wall of the first armor layer 9. That is, the cable core 6 is fixed by the loose tube 8, and the loose tube 8 contacts the inner wall of the first armor layer 9 to achieve relative fixation between the loose tube 8 and the first armor layer 9, thereby achieving further fixation of the cable core 6. At the same time, the contact between the loose tube 8 and the first armor layer 9 can also provide support for the first armor layer 9 to enhance the support effect of the first armor layer 9.

[0071] Please continue to refer to Figure 1In some embodiments, aramid is filled between the first armor layer 9 and the loose tube 8. That is, the gap between the first armor layer 9 and the loose tube 8 is filled with aramid to further enhance the firmness of the loose tube 8 inside the first armor layer 9. Aramid has ultra-high strength and modulus, with a tensile strength of more than 3,000 MPa (about 5 times that of steel wire), a modulus of up to 70-200 GPa, and a strength (strength / density) that is 10 times that of steel wire, achieving "lightweight and high strength" to improve the strength of the optical cable during use.

[0072] Optionally, in some embodiments, ultra-high molecular weight polyethylene fiber may be used instead of aramid, or glass fiber may be used instead of aramid.

[0073] Optionally, in some embodiments, the loose tube 8 is filled with optical fiber paste 7 .

[0074] That is to say, the focus of the present invention is: adopting the method of at least two cable cores 6, so as to reduce the bending strain of the optical fiber when the cable is bent under stress, thereby minimizing the bending strain of the optical fiber, and thus effectively improving the bending performance of the optical cable as a whole; the cross section of the first armor layer 9 is an equilateral triangle, and is sleeved on the outside of the loose tube 8; the triangle has stronger stability; therefore, under the action of the first armor layer 9, the stability of the optical cable can be effectively improved, so that it has enough lateral pressure resistance, greatly increasing the service life of the optical cable; the insulating shielding layer 2 is sleeved on the outside of the first armor layer 9, so that the optical cable can more effectively protect the internal cable core 6 from being affected by lightning factors when encountering lightning, thereby making the optical cable have stronger lightning protection effect; the outer sheath 1 is sleeved on the outside of the insulating shielding layer 2, and the outer sheath 1 makes the optical cable have better wear resistance; a plurality of reinforcing wires 5 are located between the first armor layer 9 and the insulating shielding layer 2; a plurality of reinforcing wires 5 are used to enhance the optical cable and have better tensile strength, so that the optical cable can be more tensile-resistant when encountering earthquake disasters.

[0075] Please refer to Figure 2 A production mold is used for the optical cable described in any of the above items, including a mold body 11, and the mold body 11 is used to form the first armor layer 9 into an equilateral triangle structure. That is to say, by developing a mold suitable for producing the above-mentioned first armor layer 9, the steel strip passing through is formed into the first armor layer 9 with an equilateral triangle structure through the mold body 11, thereby realizing the molding of the optical fiber.

[0076] Please refer to Figure 3In some embodiments, the mold body 11 includes a forming hole 13 that passes through the mold body 11, and the discharge end 10 of the forming hole 13 is an equilateral triangle structure. Specifically, the mold body 11 is a block or cylindrical structure, and a forming hole 13 is opened on the mold body 11. The forming hole 13 includes a feed end and a discharge end 10. The discharge end 10 is an equilateral triangle structure, which can ensure that the steel strip maintains an equilateral triangle structure during discharge. At the same time, the thickness of the forming hole 13 is slightly larger than the thickness of the steel strip. The forming hole 13 at the feed end is a trumpet-shaped or conical spiral structure, and as the steel strip continues to move in the forming hole 13, the shape of the steel strip gradually deforms into an equilateral triangle structure, and finally the steel strip becomes an equilateral triangle first armor layer 9.

[0077] Optionally, in some embodiments, the mold body 11 further includes a sleeve 12, which is located in the forming hole 13 and is used to pass the cable core 6. That is, the cable core 6 is directly passed through the forming hole 13 and moved synchronously with the steel belt, thereby enabling the first armor layer 9 after the steel belt is formed to directly wrap it.

[0078] Optionally, in some embodiments, a welding station is provided at the discharge port end of the mold body 11 , and the connection seam of the formed first armor layer 9 is welded by the welding station to further improve the supporting strength of the first armor layer 9 .

[0079] A preparation method, applied to any of the above optical cables,

[0080] The optical fiber bundles are dyed through a coloring process and bundled into a cable core 6;

[0081] At least two groups of cable cores 6 are sheathed with loose tubes 8 through a sheathing process;

[0082] Filling the loose tube 8 with fiber paste;

[0083] Place the steel strip in the forming hole 13 of the mold body 11, and allow the loose tube 8 filled with fiber paste to enter the sleeve 12 of the mold body 11, so that the first armor layer 9 is sleeved on the outside of the loose tube 8;

[0084] Filling the first armor layer 9 with aramid;

[0085] Arrange several reinforcing wires 5 outside the first armor layer 9;

[0086] The steel strip is passed through a mold to form a second armor layer 3 and is sheathed outside the first armor layer 9;

[0087] Filling the elastic water-blocking material 4 between the first armor layer 9 and the second armor layer 3;

[0088] Wrapping the insulating shielding material around the outside of the second armor layer 3 by a wrapping machine to form an insulating shielding layer 2;

[0089] The cable core 6 with the insulating shielding layer 2 is formed into an outer sheath 1 through an extruder to form a finished optical cable.

[0090] Adopting above-mentioned technology has the following advantages, specifically, optical cable structure adopts central tube to disperse cable core 6 formula structures, its internal optical fiber is on the axis center position of optical cable, when optical cable is bent under stress, makes the bending strain of optical fiber minimum, loose tube 8 outer coating aramid, uses three reinforcing wires 5 to strengthen simultaneously, makes optical cable have more excellent tensile strength, and when encountering earthquake disaster, optical cable can be more tensile-resistant.In addition this optical cable first armor layer 9 layers are triangle stainless steel belt armoring, because triangle has higher stability, armor layer selects the larger stainless steel belt of hardness simultaneously, makes it have enough anti-lateral pressure capabilities.In order to have bigger anti-lateral pressure capability, elastic water-blocking filler is filled in cable core 6 outer steel belts, makes optical cable have enough elastic deformation spaces when encountering earthquake disaster optical cable under pressure. In order to meet the roundness of the optical cable and sufficient compressive strength, the cable core 6 is covered with a second layer of steel belt armor. Since more metal materials are used, in order to meet the lightning protection characteristics of the optical cable, the second layer of steel belt armor is covered with an insulating shielding layer 2, so that the optical cable can more effectively protect the internal cable core 6 from the influence of lightning factors when encountering lightning.

[0091] The various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.

[0092] The above describes in detail the optical cable, production mold, and preparation method provided by the present invention. Specific examples are used herein to illustrate the principles and implementation methods of the present invention. The description of the above examples is intended only to facilitate understanding of the method and core concepts of the present invention. It should be noted that those skilled in the art may make various improvements and modifications to the present invention without departing from the principles of the present invention, and such improvements and modifications also fall within the scope of protection of the present invention.

Claims

1. An optical cable, characterized in that: include: Loose tube (8), At least two cable cores (6), wherein the at least two cable cores (6) are arranged in the loose tube (8) and are symmetrically distributed along the central axis of the loose tube (8); A first armor layer (9), the cross section of the first armor layer (9) is an equilateral triangle, and is sleeved on the outside of the loose tube (8); An insulating shielding layer (2) and an outer sheath (1), wherein the insulating shielding layer (2) is sleeved on the outside of the first armor layer (9), and the outer sheath (1) is sleeved on the outside of the insulating shielding layer (2); A plurality of reinforcing wires (5), wherein the plurality of reinforcing wires (5) are located between the first armor layer (9) and the insulating shielding layer (2).

2. The optical cable according to claim 1, wherein Also includes: A second armor layer (3), wherein the cross section of the second armor layer (3) is circular and coincides with the center axis of the loose tube (8), and the second armor layer (3) is located between the insulating shielding layer (2) and the first armor layer (9).

3. The optical cable according to claim 2, wherein: The plurality of reinforcing wires (5) are respectively located outside three sides of the first armor layer (9), and none of them are in contact with the first armor layer (9) and the second armor layer (3).

4. The optical cable according to claim 3, wherein An elastic water-blocking material (4) is filled between the first armor layer (9) and the second armor layer (3).

5. The optical cable according to claim 2, wherein The loose tube (8) is coaxially arranged with the second armor layer (3), and the outer wall of the loose tube (8) is in contact with the inner wall of the first armor layer (9).

6. The optical cable according to any one of claims 1 to 5, characterized in that: Aramid is filled between the first armor layer (9) and the loose tube (8).

7. The optical cable according to any one of claims 1 to 5, characterized in that: The loose tube (8) is filled with optical fiber paste (7).

8. A production mold, applied to the optical cable according to any one of claims 1 to 7, characterized in that: It comprises a mold body (11), wherein the mold body (11) is used to form the first armor layer (9) into an equilateral triangle structure.

9. The production mold according to claim 8, characterized in that The two ends of the mold body (11) are provided with a discharge end (10) and a feed end, and a forming hole (13) is formed through the mold body (11), and the discharge end (10) is an equilateral triangle structure; Also includes: A sleeve (12) is located in the forming hole (13) and is used to allow the cable core (6) to pass through the mold body (11).

10. A preparation method, applied to the optical cable according to any one of claims 1 to 7, characterized in that: The optical fiber bundles are dyed through a dyeing process and bundled into a cable core (6); Sheathing at least two groups of cable cores (6) with loose tubes (8) through a sheathing process; Filling the loose tube (8) with fiber paste; The steel strip is placed in the forming hole (13) of the mold body (11), and the loose tube (8) filled with fiber paste is inserted into the tube (12) of the mold body (11), so that the first armor layer (9) is sleeved on the outside of the loose tube (8); Filling the first armor layer (9) with aramid (10); Arranging a plurality of reinforcing wires (5) outside the first armor layer (9); Passing the steel strip through a die to form a second armor layer (3) and sleeved onto the outside of the first armor layer (9); Filling an elastic water-blocking material (4) between the first armor layer (9) and the second armor layer (3); Wrapping an insulating shielding material around the outside of the second armor layer (3) using a wrapping machine to form an insulating shielding layer (2); The cable core (6) with the insulating shielding layer (2) is formed into an outer sheath (1) through an extruder to form a finished optical cable.

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