Air-blowing optical cable

Abstract

The utility model discloses an air-blowing optical cable, which comprises a cable core and an outer sheath coated outside the cable core, the cable core comprises a plurality of optical fibers and a bonding part for bonding the plurality of optical fibers at intervals in the axial direction, after the outer sheath is formed, a protruding piece is arranged on the outer sheath, and the protruding piece is arranged on the outer sheath. The protruding part surrounds the outer surface of the outer sheath in a spiral shape, and the protruding part extends towards the outer side in the radial direction of the air-blowing optical cable and protrudes out of the outer sheath. The protruding piece and the outer sheath are separately molded, so that deformation caused by uneven heating and cooling of the protruding piece during integral extrusion molding is avoided; meanwhile, materials of the protruding pieces can be flexibly selected according to different construction environments, and the antifriction effect and the abrasion resistance of the optical cable in air blowing construction can be improved; according to different construction environments, the stability of the protruding part of the optical cable and flexible selection of materials are achieved, the problem that the protruding part is prone to deformation in the cooling forming process is effectively solved, and different materials can be selected according to requirements to meet the comprehensive performance requirement of the optical cable.

Description

TECHNICAL FIELD

[0001] The utility model relates to cable product especially relates to a gas blowing optical cable. BACKGROUND

[0002] The gas blowing optical cable can utilize the blowing force of compressed air and the thrust of the transmission device, and is commonly used for quickly and efficiently laying the optical cable in the urban pipeline, underground pipe network and long-distance transmission scene. In order to reduce the friction between the optical cable and the pipe wall during laying, a specific air guide groove or protruding structure is usually arranged on the outer surface of the optical cable. Through these structures, the contact area between the optical cable and the pipe can be reduced, the blowing cable efficiency can be optimized, and the optical cable itself can be protected from excessive friction damage.

[0003] However, the air guide groove is generally formed by the "integrated extrusion" method in the prior art, which often has the problem of deformation of the air guide groove caused by the cooling link, affecting the laying effect of the optical cable in the pipe; in addition, the integrated forming usually requires that the outer sheath and the air guide groove material are consistent, which easily limits the performance of the optical cable and cannot flexibly replace the material of the air guide groove according to different use requirements. Therefore, a spiral protruding structure is needed to be formed step by step with the optical cable main body in the production stage, so as to avoid deformation as much as possible and improve the flexibility of material selection, thereby fundamentally solving the defects of the above-mentioned prior art. SUMMARY

[0004] The utility model overcomes the insufficient prior art and provides a gas blowing optical cable. By arranging a spiral protruding piece on the outer sheath and adopting a step-by-step forming manufacturing method, the stability of the optical cable protruding piece and the flexible selection of the material are realized, so as to effectively reduce the problem of deformation of the protrusion in the cooling forming process, and different materials can be selected according to the requirements to meet the comprehensive performance requirements of the optical cable.

[0005] To achieve the above-mentioned purpose, the utility model adopts the technical scheme that a gas blowing optical cable comprises a cable core and an outer sheath covering the cable core, the cable core comprises a plurality of optical fibers and a bonding part intermittently bonding the plurality of optical fibers in the axial direction, a protruding piece is arranged on the outer sheath after the outer sheath is formed, the protruding piece is spirally arranged on the outer surface of the outer sheath, and the protruding piece extends outward along the radial direction of the gas blowing optical cable and protrudes from the outer sheath.

[0006] Further specifically, the two adjacent pitches of the spiral protruding piece are equal.

[0007] Further specifically, the two adjacent pitches of the spiral protruding piece are not equal.

[0008] Further specifically, the protruding pieces are arranged intermittently.

[0009] Further specifically, the protruding pieces are arranged continuously. Further specifically, the protruding pieces are arranged continuously.

[0010] Further, a placing groove is formed on the outer sheath and recessed radially inwardly, and the protruding member is arranged in the placing groove and partially extends out of the placing groove.

[0011] Further, the protruding member is arranged as a protruding strip, and the protruding strip is arranged in the placing groove.

[0012] Further, the protruding member is arranged as a plurality of balls, and the balls are uniformly arranged in the placing groove.

[0013] Further, the balls fill the placing groove.

[0014] Further, an embedded spiral groove is arranged in the placing groove, the embedded spiral groove is arranged in the placing groove, and the balls are arranged in the embedded spiral groove.

[0015] Further, the embedded spiral groove comprises an embedding body and a ball groove arranged on the embedding body, and the opening size of the ball groove is smaller than the diameter of the ball.

[0016] Further, any adhesive part on any optical fiber is a first reference adhesive part, the adjacent adhesive part on the optical fiber adjacent to the first reference adhesive part is a second reference adhesive part, the adjacent adhesive part on the optical fiber adjacent to the second reference adhesive part is a third reference adhesive part, and the first reference adhesive part, the second reference adhesive part and the third reference adhesive part are on the same straight line.

[0017] Compared with the prior art, the beneficial effects of the utility model lie in that: the protruding member is separated from the outer sheath for forming, so that the deformation caused by uneven heating and cooling of the protruding member during integrated extrusion is avoided; meanwhile, the protruding member can be flexibly selected according to different construction environments, which helps to improve the friction reduction effect and wear resistance of the optical cable in air blowing construction; according to different construction environments, the stability of the protruding member and the flexible selection of the material are realized, so as to effectively reduce the problem that the protruding member is easily deformed during the cooling forming process, and different materials can be selected according to the requirements to meet the comprehensive performance requirements of the optical cable, in addition, the utility model also takes into account the design of the reinforcing member and the water blocking assembly inside the optical cable, which further enhances the mechanical strength and waterproof performance of the optical cable, and provides more reliable protection for long-distance and high-efficiency optical cable laying. BRIEF DESCRIPTION OF DRAWINGS

[0018] The utility model will be further explained in connection with the drawings and embodiments;

[0019] Figure 1 It is the radial section structure schematic diagram of the protruding member of the utility model arranged as a protruding strip;

[0020] Figure 2is the radial section structure schematic diagram of the protruding piece set as a convex strip when the convex strip is disassembled;

[0021] Figure 3 is the radial section structure schematic diagram of the protruding piece set as a ball when the ball and the embedded spiral groove are disassembled;

[0022] Figure 4 is the radial section structure schematic diagram of the protruding piece set as a ball when the ball and the embedded spiral groove are disassembled;

[0023] Figure 5 is the side view structure schematic diagram of the protruding piece set as a convex strip;

[0024] Figure 6 is the three-dimensional structure schematic diagram of the embedded spiral groove;

[0025] Figure 7 is the structure schematic diagram of the plurality of optical fibers and the adhesive part;

[0026] Figure 8 is the structure schematic diagram of the plurality of optical fibers and the water-blocking yarn through the color thread bundling;

[0027] In the figure: 1, cable core; 11, optical fiber; 12, adhesive part; 13, water-blocking yarn; 14, color thread; 2, water-blocking tape; 3, outer sheath; 4, reinforcing member; 51, convex strip; 52, ball; 6, embedded spiral groove; 61, embedded body; 62, ball groove; 7, placing groove. DETAILED DESCRIPTION

[0028] In order to make the purpose, technical scheme and advantages of the utility model clearer, the following will combine the drawings in the utility model embodiment, and the technical scheme in the utility model embodiment is described in more detail. In the drawings, the same or similar signs represent the same or similar elements or elements with the same or similar functions. The described embodiments are part of the embodiments of the utility model, not all embodiments. The embodiments described below by referring to the drawings are exemplary and are intended to explain the utility model, and cannot be understood as limiting the utility model. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor belong to the scope of protection of the utility model.

[0029] In the description of this utility model, it should be understood that the terms "center," "longitudinal," "lateral," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting the scope of protection of this utility model. The embodiments of this utility model will be described in detail below with reference to the accompanying drawings.

[0030] It should be understood that the accompanying drawings are for illustrative purposes only.

[0031] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. These drawings are simplified schematic diagrams, which are only used to illustrate the basic structure of the present invention in a schematic manner, and therefore only show the components related to the present invention.

[0032] A type of air-blown optical cable, such as Figures 1-8 As shown, it includes a cable core 1 and an outer sheath 3 covering the cable core 1.

[0033] To reduce friction during the air-blowing installation of optical cables into external ducts, protrusions are typically provided on the outer wall of the outer sheath 3. However, the outer sheath 3 and the protrusions are usually extruded as a single unit, which requires the protrusion material to be the same as the outer sheath 3 material, thus limiting the material selection. Furthermore, since friction needs to be reduced during the installation of optical cables into external ducts, the protrusion material is generally chosen to be PE material with low friction. However, this material may deform due to cooling during the production process. Therefore, this solution provides a protrusion that is separate from the outer sheath 3, thereby solving the above problems.

[0034] like Figure 1 , Figure 2 , Figure 3 , Figure 4 as well as Figure 5As shown, after the outer sheath 3 is formed, a protrusion is provided on the outer surface of the outer sheath 3. The protrusion is spirally wrapped around the surface of the outer sheath 3. The height direction of the protrusion extends outward along the radial direction of the optical cable and protrudes from the outer sheath 3. The distance between any two adjacent pitches of the spiral protrusion is equal or unequal. The entire spiral protrusion is continuously or intermittently arranged on the outer sheath. Specifically, the entire spiral protrusion can be continuously and evenly wrapped around the outer sheath 3, or it can be intermittently arranged, but all the pitches are the same. Alternatively, the entire spiral protrusion can be continuously but not evenly arranged. Of course, the entire spiral protrusion can also be intermittently arranged, and all or part of the pitches are unequal. That is, the protrusion and the outer sheath 3 are no longer integrally formed, and can be spirally arranged on the outer sheath 3 in any state. When the spiral protrusions are not uniformly arranged, the frictional resistance between the optical cable and the external duct can be reduced, and the additional strength or flexibility in a specific area can be enhanced. In different laying environments, the non-uniform pitch design helps the optical cable to better adapt to these environmental changes and ensures the smooth progress of the laying process. When the spiral protrusions are intermittently arranged, the frictional resistance can be reduced, the airflow dynamics can be optimized, the laying speed can be increased, and the mechanical strength can be enhanced.

[0035] The pitch of the spiral protrusion is set to be less than or equal to 0.5m. When the pitch is greater than 0.5m, the pushing force of the optical cable in the external duct is less than 50N, resulting in poor air-blowing laying efficiency. Furthermore, when the pitch of the spiral protrusion 5 is set to 0.1-0.5m, there is only one protrusion 5 on any radial surface of the optical cable, leading to better air-blowing effect. By separating the protrusion from the outer sheath 3 during molding, the deformation caused by cooling shrinkage during the integral extrusion process of conventional protrusions can be avoided. At the same time, the material of the protrusion can be flexibly selected and replaced according to different construction environments and requirements, thereby overcoming the problem in the existing technology where the protrusion material must be consistent with the optical cable sheath material, which limits the overall performance of the optical cable.

[0036] The additional protrusion 5 technology focuses on enhancing the utilization of high-pressure gas by the optical cable itself during the air-blowing deployment process. The purpose of the protrusion 5 is not only to reduce contact with the external pipe wall to some extent, but more importantly, to increase its contact with air, allowing it to be more stably supported by high-pressure air within the pipe. The subsequent installation of the protrusion 5 provides greater advantages than synchronous extrusion in the following three aspects:

[0037] Intermittent and uneven settings are possible: After adopting asynchronous extrusion of the ribs 5, the ribs 5 no longer need to be extruded synchronously with the outer sheath 3. Only under this production condition can uneven settings be adopted. The outer end of the optical cable is set with denser ribs 5. The outer end is the end that enters the pipe first during laying. More high-pressure gas is obtained at the beginning of the laying construction to assist the driving force. As the optical cable extends, the density of the ribs 5 is gradually reduced and the pitch is increased, thereby saving materials and optimizing the bending performance of the optical cable, making it smoother to pass through the pipe later.

[0038] Greater production flexibility: Separating the production line for the embossed strip 5 from the optical cable production line allows for personalized customization based on different laying pipes and air blowing equipment. For example, when the external pipe size is small, a material with greater hardness can be used to prepare a embossed strip 5 with a smaller height. When the air blowing equipment has a higher pressure, a material with a higher surface friction coefficient can be used to prepare a embossed strip 5 of the same volume.

[0039] It can be compatible with various materials with different melting temperatures: In traditional manufacturing processes, the material of the raised strip 5 and the outer sheath 3 are the same material with the same melting temperature. However, with additional processes, more special materials with melting temperatures different from those of the outer sheath material can be used, giving the optical cable different additional properties, such as metal materials to enhance strength, and low-density materials with low melting temperatures to reduce the overall weight of the optical cable and accelerate laying.

[0040] The protrusion can be fixed to the outside of the outer sheath by means of bonding, snapping or embedding. For ease of installation, a placement groove 7 is formed by radially recessing on the outer sheath 3. The placement groove 7 is spirally wrapped around the surface of the outer sheath 3. The protrusion is set in the placement groove 7 and a part of the protrusion extends out of the placement groove.

[0041] The protruding component allows for a step-by-step production process. First, the outer sheath 3 is extruded, forming a placement groove 7 on its surface. Then, the protruding component is fixed within the placement groove 7 using methods such as adhesive bonding, embedding, or snap-fitting, resulting in a more stable protruding component. Simultaneously, the protruding component and the outer sheath 3 can be selectively fitted with materials tailored to their friction characteristics, toughness, and weather resistance. This allows the optical cable to contact the duct wall with lower friction and higher efficiency during air-blowing construction, reducing deformation and enhancing laying reliability. This solution not only facilitates maintenance and upgrades but also effectively solves the deformation and material limitations common in conventional protrusion forming methods, achieving broad applicability of air-blown optical cables in diverse construction environments.

[0042] The form of the protrusion is not limited; it can be set as a protruding strip 51 structure or as a ball bearing 52 form.

[0043] like Figure 1 , Figure 2 as well as Figure 5As shown, when the protrusion is set as a ridge 51, the ridge 51 is set in the placement groove 7 by means of bonding, embedding, etc. In this solution, the ridge 51 is bonded to the placement groove 7. By setting the protrusion as a ridge 51 and using bonding to fix it, the placement groove 7 can be formed on the outer sheath 3 first, and then the material of the ridge 51 can be selected as flexible plastic or metal material with better wear resistance, so that it is firmly bonded to the placement groove 7 with adhesive. Since the ridge 51 extends radially outward along the optical cable in the height direction, its contact surface with the pipe wall is relatively small, which can effectively reduce the friction of the optical cable during air blowing construction. By using a step-by-step molding method in the later stage, the defect of deformation caused by uneven cooling during the integral extrusion of the ridge 51 is avoided; in addition, the material of the ridge 51 can be different from the sheath material, breaking through the limitation of integral molding, thus having higher design flexibility in terms of strength, flexibility and friction reduction characteristics, and being more convenient in use, maintenance and upgrading. This design maintains the spiral distribution while facilitating material replacement, thereby improving the adaptability of optical cables in different pipeline environments.

[0044] When the protrusion is set as a ridge, the ridge is set intermittently, and the shape of the ridge is set as an arc shape that is more conducive to air lifting. This can reduce the air pressure used for lifting during the air blowing process, reduce energy consumption and achieve the same deployment effect.

[0045] like Figure 3 , Figure 4 As shown, when the protrusion is configured as a ball bearing 52, the ball bearing 52 is rotatably disposed within the placement groove 7. The number of balls bearing 52 is not limited; the balls bearing 52 can fill the entire placement groove 7, or gaps can be left between adjacent balls bearing 52. However, it is necessary to ensure that the position of the balls bearing 52 is uniform to avoid situations where some positions within the placement groove 7 are empty after the balls bearing 52 have moved, thus affecting friction. By enabling the ball bearing 52 to roll freely in the placement groove 7 on the surface of the outer sheath 3, the frictional resistance of the optical cable during air-blowing construction can be further reduced. The local contact characteristics of the ball bearing 52 reduce the friction surface with the pipe wall, and the rotatability of the ball bearing 52 allows it to maintain a relatively stable fit with the outer sheath 3, thus maintaining the smoothness of laying under high air pressure or long distance. At the same time, the protrusion of the ball bearing 52 and the outer sheath 3 are not integrally extruded, avoiding the cooling deformation problem that is easy to occur during one-time molding, and allowing the material of the ball bearing 52 to be flexibly selected to adapt to different construction operation environments, thereby improving the overall wear resistance and service life of the optical cable.

[0046] When the protrusion is set as a ball bearing 52, an embedded spiral groove 6 is provided in the placement groove 7, and the embedded spiral groove 6 is bonded to the placement groove 7. The ball bearing 52 can also be directly placed in the placement groove 7, but the ball bearing 52 is easy to fall out of the placement groove 7 during air blowing. If the placement groove 7 is made sufficiently enveloping to prevent the ball bearing 52 from falling out, it will complicate the manufacturing process of the outer sheath 3. The embedded spiral groove 6 includes an insert 61 and a ball bearing groove 62 formed on the insert 61. The opening of the ball bearing groove 62 is smaller than the diameter of the ball bearing 52, ensuring that the ball bearing groove 62 envelops the ball bearing 52 and prevents the ball bearing 52 from falling out. At the same time, the front and rear ends of the embedded spiral groove 6 are blocked to prevent the ball bearing 52 from falling out. By first fixing the embedded spiral groove 6 into the placement groove 7 on the surface of the outer sheath 3, and then installing the ball bearing 52 into the embedded spiral groove 6, the ball bearing 52 is reliably positioned while maintaining its rotatability, preventing it from falling off or shifting during high-speed air blowing construction in the pipeline. Simultaneously, the embedded spiral groove 6 can be made of flexible or elastic material as needed and is firmly bonded to the placement groove 7 with adhesive, overcoming the structural deformation problem caused by inconsistent thermal expansion and contraction of materials in one-piece molding. This solution separates the ball bearing 52 from the embedded spiral groove 6 from the outer sheath 3, improving maintainability and replaceability while allowing for the selection of appropriate materials for different construction environments, achieving superior overall performance in terms of friction reduction, wear resistance, and weather resistance.

[0047] like Figure 7 , Figure 8As shown, the cable core 1 includes a plurality of optical fibers 11 and adhesive portions 12 that intermittently bond the plurality of optical fibers 11 in the axial direction. Any adhesive portion 12 on any optical fiber 11 is a first reference adhesive portion, an adjacent adhesive portion 12 on an optical fiber 11 adjacent to the first reference adhesive portion is a second reference adhesive portion, and an adjacent adhesive portion 12 on an optical fiber 11 adjacent to the second reference adhesive portion is a third reference adhesive portion. The first reference adhesive portion, the second reference adhesive portion, and the third reference adhesive portion are on the same straight line. For example, three optical fibers 11 are arranged in sequence as the first optical fiber, the second optical fiber, and the third optical fiber. Each optical fiber 11 has three adhesive portions 12, arranged in sequence as the first adhesive portion, the second adhesive portion, and the third adhesive portion. The first adhesive portion on the second optical fiber is defined as the first reference adhesive portion. The optical fibers adjacent to the first reference adhesive portion are the first optical fiber and the third optical fiber. The adhesive portions adjacent to the first reference adhesive portion are the first adhesive portions of the first optical fiber and the first adhesive portions of the third optical fiber. The two first adhesive portions are the second reference adhesive portions. If there is a fourth optical fiber, the optical fiber adjacent to the second reference adhesive portion is the fourth optical fiber. The first adhesive portion adjacent to the second reference adhesive portion is the first adhesive portion of the fourth optical fiber. This first adhesive portion is the third reference adhesive portion. The first reference adhesive portion, the second reference adhesive portion, and the third reference adhesive portion are on the same straight line, that is, the first adhesive portions of the first optical fiber, the second optical fiber, the third optical fiber, and the fourth optical fiber are on the same straight line.

[0048] The high-precision dispensing technology used in the fiber optic strip 11 ensures that the connecting lines of adjacent adhesive portions 12 of any adjacent fiber optic strip 11 are on the same straight line. In this design, the adhesive portions 12 are set as adhesive dots with a deviation of less than 0.1mm between them. This high precision helps ensure that the cross-sectional differences between several fibers 11 after cutting are minimal during the overall fusion splicing process of the fiber optic strip 11, maximizing the stability of the fusion splicing performance and reducing fusion loss.

[0049] like Figure 8As shown, two colored wires 14 are arranged around several optical fibers 11. The two colored wires 14 are twisted in opposite directions to bundle the optical fibers 11 into an optical fiber bundle. Several optical fibers 11 are bonded together to form an optical fiber ribbon. The two colored wires 14 can bundle only one optical fiber ribbon or multiple optical fibers. Water-blocking yarn 13 is arranged inside the optical fiber bundle. The water-blocking yarn 13 is made of high-expansion water-blocking yarn. The colored wires 14 bundle several optical fibers 11 and one water-blocking yarn 13 to form an optical fiber bundle. Several optical fiber bundles are twisted into cable core 1. Prepare several optical fibers 11 and one high-expansion water-blocking yarn, and then prepare two colored wires 14. Wrap several optical fibers 11 and one water-blocking yarn 13 by twisting in opposite directions. The colored wires 14 are made of 111D polyester yarn. The polyester yarn can be designed in different colors according to requirements to facilitate the differentiation of different optical fiber bundles. The optical fiber ribbons in any bundle can be distinguished by inkjet markings. Setting the pitch of the colored thread 14 winding to less than 7cm allows for better differentiation of fiber bundles. Traditional fiber bundles often only have surface markings on the fiber ribbon. When marking is used as the primary identification method, it becomes difficult to quickly distinguish individual fiber bundles as the core count increases. The different colored threads in this solution allow construction workers to quickly separate different fibers based on the colored thread 14, significantly improving the splicing efficiency of ultra-high core count fiber bundles.

[0050] like Figure 1 , Figure 2 , Figure 3 , Figure 4 As shown, to ensure the strength of the optical cable and prevent deformation during transportation or laying, reinforcing members 4 are provided inside the outer sheath 3. These reinforcing members 4 are evenly distributed circumferentially within the outer sheath 3. By embedding multiple reinforcing members 4 circumferentially in the outer sheath 3, the overall mechanical strength and tensile strength of the optical cable can be improved, enabling it to more effectively resist external impacts, bending, or pulling during construction and use. The material of the reinforcing members 4 can be flexibly selected, such as aramid yarn, fiberglass, or metal wire, to adapt to diverse construction environments and extend the service life of the optical cable. The placement of reinforcing members inside the outer sheath 3 does not affect the installation of the grooves 7 and protrusions on the surface of the outer sheath 3, and they can also work together with the protrusions to ensure the stability and durability of the optical cable under air blowing or other laying methods, thereby further overcoming the limitations of existing optical cables in simultaneously achieving both strength and friction reduction performance.

[0051] When the protrusion is set as a ridge strip, the ridge strip is made of tensile material, such as aramid fiber, glass fiber, or galvanized steel wire. Simultaneously, no reinforcement is installed inside the outer sheath. During actual cable deployment, a portion of the tension from the traction equipment or the fixing hardware after installation is transferred to this tensile material, thereby increasing the overall tensile strength of the optical cable and enabling it to withstand greater tension. In this case, the ridge strip primarily functions as an external reinforcement, fixed to the optical cable, significantly improving its tensile strength. Furthermore, the previously embedded reinforcement is no longer necessary, resulting in a simpler structure during production, accelerating production efficiency, and allowing for simpler equipment to reduce stretching of the optical cable during production, thereby reducing fiber attenuation and improving cable performance.

[0052] Of course, a few more embedded reinforcing components can be added to enhance the overall tensile strength of the optical cable.

[0053] like Figure 1 , Figure 2 , Figure 3 , Figure 4 As shown, a water-blocking strip 2 is provided outside the cable core 1. By wrapping the cable core 1 with the water-blocking strip 2, external moisture can be effectively prevented from seeping into the optical cable along the optical fiber axis, thereby enhancing the waterproof reliability of the optical cable. At the same time, the comprehensive configuration of the water-blocking strip 2, the outer sheath 3, and the reinforcing member 4 enables the optical cable to maintain stable performance in humid environments or pipelines for a long time. Combined with the spiral protrusion structure, it not only ensures the efficiency of air-blowing construction but also improves the overall weather resistance and service life of the optical cable.

[0054] A manufacturing process for air-blown optical cables includes the following steps:

[0055] S1, which is provided with several optical fibers 11 and a water-blocking yarn 13, and two colored threads 14 are wrapped around the outer sides of the optical fibers 11 and the water-blocking yarn 13 to form an optical fiber bundle.

[0056] S2, which is equipped with several optical fiber bundles twisted together to form cable core 1, and then enters the mold after cable formation;

[0057] S3, the mold rotates, and the cable core 1 is extruded into the outer sheath 3 in the mold. A placement groove 7 is formed on the outer sheath 3, and the placement groove 7 is spirally arranged on the outer sheath 3.

[0058] S4, the outer sheath 3 is vacuum sizing after curing;

[0059] S5, a protrusion is provided in the placement groove 7;

[0060] S6, when the protrusion is set as a protrusion 51, the protrusion 51 is fixed in the placement groove 7 and the protrusion 51 is bonded to the placement groove 7; when the protrusion is set as a ball 52, the embedded spiral groove 6 is fixed in the placement groove 7 and the ball 52 is set in the embedded spiral groove 6 and the embedded spiral groove 6 is bonded to the placement groove 7.

[0061] By wrapping several optical fibers 11 with water-blocking yarn 13 and two colored threads 14 in opposite directions to form an optical fiber bundle, and then inserting it into the mold after cabling, the orderly distribution of each optical fiber and the waterproof properties of the water-blocking yarn 13 can be effectively guaranteed when the cable core 1 is integrally stranded and formed. In S3, the outer sheath 3 is extruded synchronously by rotating the mold, forming a spiral structure of placement groove 7 on its surface. This ensures the forming accuracy of the outer sheath 3 and the cable core 1, and avoids the problem of easy deformation of protrusions during integrated extrusion. Different molds can be changed to obtain the required outer sheath 3 and placement groove 7 according to the shape and size of the required placement groove 7. By curing and vacuum sizing in S4, a uniform and reliable outer sheath 3 size can be obtained, which is conducive to the subsequent installation of protrusions. The components provide a stable foundation. In S5 and S6, if the protrusion 51 is selected, it can be directly bonded, snapped, or embedded in the placement groove 7. If the ball 52 is selected, it is bonded, snapped, or embedded in the placement groove 7 using the embedded spiral groove 6, and the ball 52 is placed therein, forming a friction-reducing structure that can roll freely or be flexibly replaced. Since the protrusion and the outer sheath 3 are formed in steps and the materials can be selected according to the requirements, it overcomes the defects of traditional one-piece extrusion, which requires the materials to be consistent and the cooling deformation causes the performance of the protrusion to be limited. It realizes the stable setting of the friction-reducing protrusion of the optical cable, and has the comprehensive performance of waterproofing, reinforcement and efficient deployment, further improving the applicability and service life of the optical cable in diverse environments such as air blowing construction.

[0062] In optional embodiments of this invention, the protrusions on the outer sheath 3 can be made of flexible plastic protrusions 51 or balls 52, or metal or composite materials can be selected according to different usage requirements. For example, the protrusions 51 can be made of the same or different types of plastic as the outer sheath 3 to balance friction reduction and wear resistance; the balls 52 can be made of metal, stainless steel, nylon, or other polymer materials to achieve lower friction and better durability during high-pressure air-blowing construction. The embedded spiral groove 6 can be made of soft or elastic materials, such as silicone, TPU, or modified plastics containing polymer elastomers, and is fixed to the placement groove 7 on the surface of the outer sheath 3 by adhesive to achieve reliable support and positioning of the balls 52. For the bonding method, hot melt adhesive, epoxy resin, or rubber adhesive can be used according to the material characteristics to ensure connection strength and weather resistance.

[0063] The reinforcing member 4 can be made of aramid yarn, glass fiber, metal wire, or FRP rod, depending on the tensile strength and durability requirements of the environment in which the optical cable is located. The water-blocking tape 2 can be a waterproof layer containing a water-absorbing polymer or a composite water-blocking material, so that the cable core 1 can quickly absorb and expand when exposed to external moisture and block the spread of moisture. The water-blocking yarn 13 can be made of specially treated yarn or water-absorbing fiber and placed inside the fiber 11 bundle to further block moisture intrusion. Since the bonding part 12 of the optical fiber 11 in the cable core 1 is axially discontinuous and arranged in a straight line on adjacent optical fibers 11, combined with the forward and reverse winding of the two colored threads 14, the regular arrangement of the fiber 11 bundle in cabling and subsequent use can be fully guaranteed and the operation can be simplified. Based on the above-mentioned multiple optional materials and combinations, this utility model can take into account the diverse needs for external friction-reducing protrusions and the internal water-blocking and reinforcement performance requirements in specific implementations, providing the optical cable with wider applicability and longer service life in different construction environments and long-distance transmission occasions.

[0064] In summary, by separating the spiral protrusion structure from the optical cable sheath during molding, deformation caused by uneven heating and cooling of the protrusion during integral extrusion is avoided. Simultaneously, the spiral protrusion can be flexibly materialized according to different construction environments, which helps improve the friction reduction and wear resistance of the optical cable during air-blowing construction. The stability of the optical cable protrusion and the flexibility in material selection are achieved according to different construction environments, effectively reducing the problem of easy deformation of the protrusion during cooling molding. Different materials can be selected according to requirements to meet the comprehensive performance needs of the optical cable. Furthermore, this invention also considers the design of the internal reinforcing member 4 and water-blocking component of the optical cable, further enhancing the mechanical strength and waterproof performance of the optical cable, providing a more reliable guarantee for long-distance, high-efficiency optical cable laying.

[0065] Based on the preferred embodiments of this utility model described above, those skilled in the art can make various changes and modifications without departing from the technical concept of this utility model. The technical scope of this utility model is not limited to the contents of the specification, but must be determined according to the scope of the claims.

[0066] The preferred embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the specific details of the above embodiments. Within the scope of the technical concept of the present invention, various simple modifications can be made to the technical solution of the present invention, and these simple modifications all fall within the protection scope of the present invention.

[0067] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable way without contradiction. In order to avoid unnecessary repetition, this utility model will not describe the various possible combinations separately.

[0068] Furthermore, various different embodiments of this utility model can be combined in any way, as long as they do not violate the spirit of this utility model, they should also be regarded as the content disclosed by this utility model.

Claims

1. An air-blown optical cable, characterized in that: The cable includes a cable core (1) and an outer sheath (3) covering the cable core (1). The cable core (1) includes a plurality of optical fibers (11) and an adhesive portion (12) that intermittently bonds the plurality of optical fibers (11) in the axial direction. After the outer sheath (3) is formed, a protrusion is provided on the outer sheath (3). The protrusion is spirally wrapped around the outer surface of the outer sheath (3). The protrusion extends outward along the radial direction of the air-blown optical cable and protrudes out of the outer sheath (3).

2. The air-blown optical cable according to claim 1, characterized in that: The pitch of two adjacent spiral protrusions is equal.

3. The air-blown optical cable according to claim 1, characterized in that: The pitch of two adjacent spiral protrusions is not equal.

4. The air-blown optical cable according to claim 2 or 3, characterized in that: The protrusions are intermittently arranged.

5. The air-blown optical cable according to claim 2 or 3, characterized in that: The protrusions are continuously arranged.

6. The air-blown optical cable according to claim 1, characterized in that: A placement groove (7) is formed radially inward on the outer sheath (3), and the protrusion is disposed in the placement groove (7) and partially extends out of the placement groove (7).

7. The air-blown optical cable according to claim 6, characterized in that: The protrusion is configured as a ridge (51), which is disposed within the placement groove (7).

8. The air-blown optical cable according to claim 6, characterized in that: The protrusion is configured as a ball (52), and a plurality of balls (52) are provided, which are evenly arranged in the placement groove (7).

9. The air-blown optical cable according to claim 8, characterized in that: The ball bearings (52) are distributed throughout the placement groove (7).

10. The air-blown optical cable according to claim 8 or 9, characterized in that: An embedded spiral groove (6) is provided in the placement groove (7). The embedded spiral groove (6) is provided in the placement groove (7), and the ball (52) is provided in the embedded spiral groove (6). The embedded spiral groove (6) includes an insert (61) and a ball groove (62) formed on the insert (61). The opening of the ball groove (62) is smaller than the diameter of the ball (52).

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