A fish-scale airway air-blown microcable, its preparation method, and its application.

Abstract

This invention discloses a fish-scale air-blown microcable with an air duct, its preparation method, and its application, belonging to the field of optical cable manufacturing technology. It includes a traction optical unit; cutting the surface of a heat-shrinkable tape along a first direction to form a fish-scale structure; rolling the heat-shrinkable tape to form a tube; setting a first extrusion die; introducing the optical unit and the fish-scale tube into the first extrusion die; and extruding an outer sheath in the first extrusion die. The fish-scale structure shrinks and curls under the action of the sheath material, forming protrusions that curve upwards in the same direction within the fish-scale tube. The preparation method of the fish-scale air-blown microcable of this invention involves cutting the surface of a heat-shrinkable tape to form a fish-scale structure. The heat released during sheath material forming causes the fish-scale structure to shrink along the tube direction. The fish-scale protrusion structure reduces the contact area between the air-blown microcable and the wall of the air-blowing hole, facilitating the deployment of the air-blown microcable within the air-blowing hole and increasing the fiber density.

Description

Technical Field

[0001] This invention belongs to the field of optical cable manufacturing technology, specifically relating to a fish-scale air-blown microcable with air channels, its manufacturing method, and its application. Background Technology

[0002] With the arrival of the 5G era, data is growing explosively, and massive amounts of data need to be processed through dense networking.

[0003] Air-blown microcables are optical cables that can be installed using air-blowing methods. They offer advantages such as high fiber density, small diameter, light weight, and high air-blowing installation efficiency. They are widely used in backbone networks, local area networks, and access networks, effectively saving pipeline resources. While air-blown microcables offer high installation efficiency, their small size and flexible, bendable structure (designed for fiber transport) cause them to easily accumulate at the bottom of the pipeline during installation. A significant amount of airflow remains within the pipeline, failing to provide a propulsive effect and wasting considerable air-blowing energy, thus limiting the air-blowing distance. Furthermore, once installed, air-blown microcables occupy existing pipeline resources, making subsequent small-scale expansion impractical. Summary of the Invention

[0004] In view of one or more of the above-mentioned defects or improvement needs of the prior art, the present invention provides a method for preparing a fish-scale airway air-blown microcable. The prepared cable realizes the purpose of expanding the space of the air-blown microcable structure within the space range of the existing cable in the later stage, and solves the problems of low air-blowing efficiency and short air-blowing distance of the existing air-blown microcable.

[0005] To achieve the above objectives, the present invention provides a method for preparing a fish-scale airway air-blown microcable, which includes the following steps: S1, Traction Light Unit; S2. Preparation of fish scale tube body: Prepare heat shrinkable tape, cut the surface of the heat shrinkable tape along the first direction to form a fish scale-like structure on the surface of the heat shrinkable tape; roll the heat shrinkable tape to form a tube body, the extension direction of the tube body is the same as the extension direction of the fish scale-like structure, and the heat shrinking direction of the heat shrinkable tape is the same as the extension direction of the tube body. S3. Set up a first extrusion die, and introduce the light unit and the fish scale tube into the first extrusion die respectively; S4. The outer sheath is extruded and formed in the first extrusion die. The fish scale-like structure shrinks and curls under the action of the sheath material, forming protrusions that rise in the same direction inside the fish scale tube.

[0006] As a further improvement of the present invention, the preparation of the heat-shrinkable tape in step S2 includes: A second extrusion die is set up, and low-shrinkage polyethylene is added inside the second extrusion die. A third extrusion die is set up, and polyoxymethylene is added inside the third extrusion die. The outlet of the third extrusion die is connected to the second extrusion die to extrude and form a low-shrinkage polyethylene sheet with linear polyoxymethylene on the second extrusion die. The sheet is then stretched, cooled, and shaped to form a heat-shrinkable tape.

[0007] As a further improvement of the present invention, step S2, which involves rolling the heat-shrinkable tape to form a tubular structure, specifically includes: Set up a figure-6 mold, roll up the heat shrinkable tape and insert it into the figure-6 mold to form a tubular heat shrinkable tape. Apply hot melt adhesive to the seam of the heat shrinkable tape and bond the tape to form a fish scale tube.

[0008] As a further improvement of the present invention, the low-shrinkage polyethylene has a shrinkage rate of 1% to 1.2% along the axial direction of the fish-scale tube at 180 to 200°C; the polyoxymethylene has a shrinkage rate of 2% to 3.5% along the axial direction of the fish-scale tube at 180 to 200°C.

[0009] As a further improvement of the present invention, the formation of a fish-scale-like structure on the surface of the heat-shrinkable tape specifically includes: A V-shaped cutter is set up, the surface of the V-shaped cutter is heated, the heat shrinkable tape is laid flat, and the V-shaped cutter is cut into the surface of the heat shrinkable tape along the first direction to form a fish scale-like structure on the heat shrinkable tape.

[0010] As a further improvement of the present invention, when the V-shaped cutter cuts into the surface of the heat-shrinkable tape, the cutting thickness of the V-shaped cutter is less than the thickness of the heat-shrinkable tape.

[0011] As a further improvement of the present invention, the inner wall of the first extrusion die is provided with a notch opened along the extrusion direction; the outlet direction of the first extrusion die is also provided with a swinging component, which is used to drive the molding outer sheath to swing radially.

[0012] This application also includes a fish-scale airway air-blown microcable, which is prepared by the above-described method for preparing fish-scale airway air-blown microcables, and comprises: At least one optical unit; the optical unit is covered with an outer sheath; the outer sheath has a plurality of air blowing holes along the axial direction, and the inner walls of the plurality of air blowing holes have a plurality of fish scale protrusions along a second direction, the plurality of fish scale protrusions form an inclination angle with the inner walls of the air blowing holes, and the inclination angles of the plurality of fish scale protrusions are in the same direction.

[0013] As a further improvement of the present invention, the outer sheath surface has a plurality of radially protruding air-blowing ridges, and the plurality of air-blowing ridges are arranged spirally wound along the axial direction of the outer sheath.

[0014] This application also includes the application of a fish-scale airway air-blowing microcable in secondary air-blowing construction, which includes: introducing the fish-scale airway air-blowing microcable into a pipeline, introducing airflow in the opposite direction of the fish-scale protrusions, and air-blowing the fish-scale airway air-blowing microcable. Introduce an air-blowing micro-cable into the air-blowing hole and blow the micro-cable into the fish scale protrusions in the positive direction.

[0015] The aforementioned improved technical features can be combined with each other as long as they do not conflict with each other.

[0016] In summary, the beneficial effects of the above-described technical solutions conceived by this invention compared with the prior art include: (1) The fish-scale air-blowing micro-cable of the present invention has an air-blowing hole in the outer sheath and multiple fish-scale protrusions in one direction in the air-blowing hole. When the fish-scale air-blowing micro-cable is laid, the airflow is injected in the opposite direction of the fish-scale protrusions. The fish-scale protrusions form an obstruction to the airflow in the airway, thereby increasing the thrust of the airflow on the fish-scale air-blowing micro-cable and increasing the laying distance of the fish-scale air-blowing micro-cable. At the same time, when a secondary laying of the cable is required, a smaller diameter air-blowing micro-cable can be laid in the forward direction of the fish-scale protrusions. At this time, because the fish-scale protrusions have a smaller contact area with the cable and less friction, they can help the air-blowing micro-cable to travel in the air-blowing hole, so as to facilitate the secondary laying of the air-blowing micro-cable, improve the utilization rate of the fish-scale air-blowing micro-cable, and increase the fiber optic laying density.

[0017] (2) The method for preparing the fish-scale air-blown microcable of the present invention involves cutting a fish-scale structure on the surface of a heat-shrinkable tape. When the fish-scale tape is longitudinally wrapped into a tube and inserted into the outer sheath, the heat released during the forming of the sheath material causes the fish-scale structure to shrink along the direction of the tube. The material thickness at the end of the fish-scale structure connected to the heat-shrinkable tape is thicker than that at the end, and its shrinkage is greater. This causes the fish-scale structure to curl up inside the fish-scale tube, forming a curled structure arranged in a fish-scale pattern inside the air-blown hole. The curled structure can provide air-blowing resistance when the fish-scale air-blown microcable is laid out, increasing the laying distance of the fish-scale air-blown microcable. At the same time, the curled structure can reduce the contact area between the air-blown microcable and the wall of the air-blown hole, facilitating the laying of the air-blown microcable inside the air-blown hole and increasing the fiber density.

[0018] (3) The method for preparing the fish scale airway air-blowing microcable of the present invention involves embedding reinforcing ribs along the extension direction of the heat-shrinkable tape. The reinforcing ribs have a higher shrinkage rate than the tape substrate. When the fish scale tube is heated, the reinforcing ribs shrink and pull the unidirectionally cut, inverted scales to rise, so as to form fish scale protrusions that rise in one direction in the air-blowing hole, thus ensuring the formation of the fish scale airway air-blowing microcable. Attached Figure Description

[0019] Figure 1This is a schematic diagram of the overall structure of the fish-scale airway air-blowing microcable in an embodiment of the present invention; Figure 2 This is an extrusion schematic diagram of the fish-scale airway air-blown microcable preparation method in an embodiment of the present invention; Figure 3 This is a schematic diagram of the surface cutting of the heat-shrinkable tape in an embodiment of the present invention; Figure 4 This is a schematic diagram of the air-blowing installation of the fish-scale airway air-blowing micro-cable in an embodiment of the present invention; Figure 5 This is a schematic diagram of laying air-blown micro-cables inside the air-blowing holes in an embodiment of the present invention.

[0020] In all the accompanying drawings, the same reference numerals denote the same technical features, specifically: 1. Optical unit; 2. Outer sheath; 3. Air blow hole; 4. Protrusion; 5. Air blow ridge; 6. Water-blocking tape; 7. First extrusion die; 8. Fish scale tube body; 9. Heat shrinkable tape; 10. Fish scale structure; 11. Pipe. Detailed Implementation

[0021] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention. Furthermore, the technical features involved in the various embodiments of this invention described below can be combined with each other as long as they do not conflict with each other.

[0022] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention 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 limitations on this invention.

[0023] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0024] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0025] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0026] Example: Please see Figures 1-5 The fish-scale air-blowing microcable of the preferred embodiment of the present invention includes: at least one optical unit 1, the outer periphery of the optical unit 1 is covered with an outer sheath 2; a plurality of air-blowing holes 3 are opened in the outer sheath 2 along the axial direction, and a plurality of fish-scale protrusions 4 are formed on the inner wall of the plurality of air-blowing holes 3 along a second direction, the plurality of fish-scale protrusions 4 form an inclination angle with the inner wall of the air-blowing holes 3, and the inclination angles of the plurality of fish-scale protrusions 4 are in the same direction.

[0027] The fish-scale air-blown microcable of this application features an air-blowing hole 3 inside the outer sheath 2, with multiple fish-scale protrusions 4 forming in one direction within the air-blowing hole 3. During installation, airflow is injected in the opposite direction of the fish-scale protrusions 4, creating airflow obstruction within the airway and increasing the thrust of the airflow on the microcable, thus extending its installation distance. Furthermore, when secondary cable installation is required, the microcable can be installed in the forward direction of the fish-scale protrusions 4. These protrusions reduce the contact area between the microcable and the inner wall of the air-blowing hole 3, facilitating installation within the hole and increasing the air-blowing distance. This installation direction also improves the utilization rate of the microcable, increases fiber optic density, and facilitates secondary expansion of the network.

[0028] Preferably, the first direction in this application is the direction in which the V-shaped cutter cuts into the surface of the heat-shrinkable tape 9. When the heat-shrinkable tape 9 is placed on a horizontal plane, the cutting angle of the V-shaped cutter is between 5° and 30°. This can increase the height of the protrusion 4 of the fish-scale structure 10 without causing significant damage to the radial strength of the fish-scale tube 8, thus preventing the outer sheath 2 from directly flattening the fish-scale tube 8 during extrusion molding and causing the air blowhole 3 to fail to form. The second direction in this application is the lifting height of the fish-scale structure 10 after heating. When the heat-shrinkable tape 9 is placed on a horizontal plane, the protrusion 4 angle of the fish-scale structure 10 is between 10° and 30°. It is worth noting that the cutting angle of the V-shaped cutter and the protrusion 4 angle of the fish-scale structure 10 are not completely linearly related. The lifting angle of the fish-scale structure 10 is mainly related to the shrinkage degree of the heat-shrinkable tape 9 and the expansion rate of the reinforcing ribs.

[0029] Preferably, there can be multiple optical units 1 in this application. Multiple optical units 1 can be placed directly in the outer sheath 2 or twisted together with the reinforcing core.

[0030] Preferably, the outer sheath 2 in this application can be made of one of PE (polyethylene), PP (polypropylene), PVC (polyvinyl chloride) or LSZH (low smoke halogen-free material).

[0031] As a further preferred embodiment of the present invention, multiple reinforcing cores are embedded axially within the outer sheath 2 of this application. These reinforcing cores can be one or more of steel wire, GFRP (glass fiber reinforced material), KFRP (aramid fiber reinforced material), or aramid. Optionally, the outer periphery of the stranded optical unit 1 in this application is also covered with a water-blocking tape 6, water-blocking yarn, or coated with water-blocking paste to ensure the water-blocking capability of the air-blown microcable.

[0032] Furthermore, the outer sheath 2 of this application has multiple radially protruding air-blowing ridges 5, and these ridges 5 are spirally wound along the axial direction of the outer sheath 2. Since the outer sheath 2 of the air-blowing microcable is a flexible structure, when the fish-scale airway air-blowing microcable is placed inside the pipe 11, the microcable will adhere to the inner wall of the pipe 11, making air blowing difficult. This application addresses this by providing air-blowing ridges 5 on the surface of the outer sheath 2. When the air-blowing ridges 5 abut against the inner wall of the pipe 11, the surface of the outer sheath 2 will not be completely adhered to the pipe 11, reducing the contact area between the fish-scale airway air-blowing microcable and the pipe 11, reducing friction, and increasing the air blowing distance of the fish-scale airway air-blowing microcable. Specifically, the air-blowing ridge 5 structure on the surface of the outer sheath 2 can be achieved by changing the shape of the extrusion die; simply changing the extrusion shape of the die to have a protruding ridge 4 structure is sufficient. Meanwhile, after the outer sheath 2 is cooled and formed, the outer sheath 2 is driven to rotate or swing radially by the rotating structure. The formed outer sheath 2 rotates with the rotating structure, and the outer sheath 2 that has just been extruded from the extrusion die swings accordingly, thereby forming air blown ridges 5 arranged in a spiral on the surface of the outer sheath 2.

[0033] Because this application requires embedding a fish-scale tube 8 within the outer sheath 2, and the fish-scale tube 8 itself needs to be formed with fish-scale protrusions 4, existing manufacturing processes cannot adequately address the forming of this type of optical cable. This application correspondingly includes a method for preparing a fish-scale air-blown microcable, which includes the following steps: S1, Traction Light Unit 1; S2. Preparation of fish scale tube body 8: Prepare heat shrinkable tape 9, cut the surface of heat shrinkable tape 9 along the first direction to form a fish scale-like structure 10 on the surface of heat shrinkable tape 9; roll heat shrinkable tape 9 to form tube body, and the extension direction of tube body is the same as the extension direction of fish scale, and the heat shrinking direction of heat shrinkable tape 9 is the same as the extension direction of tube body. S3. Set up the first extrusion mold 7, and introduce the light unit 1 and the fish scale tube 8 into the first extrusion mold 7; S4. The outer sheath 2 is extruded and formed in the first extrusion die 7. The fish scale structure 10 is thermally shrunken and curled under the action of the sheath material, forming protrusions 4 that are raised in the same direction inside the fish scale tube body 8.

[0034] The core of the fish-scale airway air-blowing micro-cable in this application lies in the pretreatment of the fish-scale tube body 8. This is achieved by forming a heat-shrinkable tape 9 along the direction of the tube body, and then cutting the surface of the heat-shrinkable tape 9 to form a fish-scale structure 10 on the surface of the heat-shrinkable tape 9. Then, by rolling the heat-shrinkable tape 9 into a tubular structure, the heat of the sheath material is transferred to the surface of the fish-scale tube body 8 when the outer sheath 2 is formed, causing the fish-scale tube body 8 to shrink. The material thickness at the end of the fish-scale structure 10 connected to the heat-shrinkable tape 9 is thicker than that at the end, and its shrinkage degree is higher. This causes the fish-scale structure 10 to curl up inside the fish-scale tube body 8, forming a curled structure arranged in a fish-scale pattern inside the air-blowing hole 3. In conventional optical cable manufacturing processes, there is usually no need to form a uniformly distributed fish-scale structure 10 inside the air-blowing tube. Furthermore, since the diameter of the air-blowing microcable is typically between 3.5 and 15 mm, the size of the air-blowing tube is often even smaller, making it impossible to obtain the fish-scale tube structure 8 using conventional embedding or die extrusion molding methods. This application cleverly utilizes the residual heat during the molding of the outer sheath 2 and controls the thermal shrinkage direction of the fish-scale tube 8 to make the fish-scale structure 10 curl and curl up under heat to form a fish-scale structure.

[0035] Furthermore, as a preferred embodiment of the present invention, the preparation of the heat-shrinkable tape 9 in step S2 of this application specifically includes: A second extrusion die is set up, and low-shrinkage polyethylene is added inside the second extrusion die. A third extrusion die is set up, and polyoxymethylene (POM) is added inside the third extrusion die. The outlet of the third extrusion die is connected to the second extrusion die to extrude and form a low-shrinkage polyethylene sheet with linear POM on the second extrusion die. The sheet is then stretched, cooled, and shaped to form a heat-shrinkable tape 9. To ensure the fish-scale protrusions 4 rise properly during the forming of the heat-shrinkable tape 9, this application embeds POM within the low-shrinkage polyethylene sheet during extrusion. Typically, the shrinkage rate of low-shrinkage polyethylene at 180-200°C is 1%-1.2%, and the shrinkage rate of POM at 180-200°C is 2%-3.5%. The extrusion temperature of the sheath material is 180-230°C. When the outer sheath 2 is extruded onto the surface of the fish-scale tube 8, the temperature of the sheath material heats the surface of the fish-scale tube 8. At this time, the linear POM stretches and pulls the fish-scale structure 10, causing the fish-scale structure 10 to rise. It is worth noting that this application mainly achieves the curling of the fish scale structure 10 through the shrinkage of polyoxymethylene. The low shrinkage rate of the low-shrinkage polyethylene sheet is mainly to avoid excessive shrinkage of the fish scale tube 8, which would make it difficult to control the excess length of the optical fiber.

[0036] Further preferably, step S2 of this application, where the heat-shrinkable tape 9 is rolled to form a tubular structure, specifically includes: setting a figure-6 mold, rolling the heat-shrinkable tape 9 and inserting it into the figure-6 mold to form a tubular heat-shrinkable tape 9, applying hot melt adhesive to the seam of the heat-shrinkable tape 9, and bonding the heat-shrinkable tape 9 to form a fish-scale tube body 8. In this application, the fish-scale tube body 8 needs to be inserted into the outer sheath 2 in order to form the air blowing hole 3 within the outer sheath 2, while the inside of the tube structure cannot be normally cut to form a fish-scale sheet structure 10. In this application, the surface of the heat-shrinkable tape 9 is cut to form the fish-scale sheet structure 10; then, a figure-6 mold is used to roll the heat-shrinkable tape 9 to form a tubular structure, thus completing the preparation process of the fish-scale tube body 8.

[0037] Furthermore, as an optional embodiment of the present invention, the formation of a fish-scale-like structure 10 on the surface of the heat-shrinkable tape 9 specifically includes: A V-shaped cutter is set up, the surface of the V-shaped cutter is heated, the heat shrinkable tape 9 is laid flat, and the V-shaped cutter is cut into the surface of the heat shrinkable tape 9 along the first direction to form a fish scale-like structure 10 on the heat shrinkable tape 9.

[0038] When forming the fish-scale structure 10 on the surface of the heat-shrinkable tape 9 using a V-shaped cutter, in addition to cutting the surface of the heat-shrinkable tape 9, the V-shaped cutter can also be appropriately heated. When the V-shaped cutter cuts the surface of the heat-shrinkable tape 9, the heat-shrinkable tape 9 is correspondingly heated, and the polyoxymethylene shrinks slightly to achieve the separation of the fish-scale structure 10 from the heat-shrinkable tape 9, which facilitates the subsequent extrusion of the outer sheath 2, where the fish-scale structure 10 heat-shrinks and curls to form the protrusion structure 4.

[0039] Furthermore, as a preferred embodiment of the present invention, when the V-shaped cutter cuts into the surface of the heat-shrinkable tape 9, the cutting thickness of the V-shaped cutter is less than the thickness of the heat-shrinkable tape 9. This application primarily aims to achieve a raised protrusion 4 structure on the surface of the heat-shrinkable tape 9. Since the heat-shrinkable tape 9 needs to be rolled into a fish-scale tube 8 later, when the V-shaped cutter cuts through the heat-shrinkable tape 9, it will damage the tubular structure of the fish-scale tube 8, greatly reducing its pressure-bearing capacity. This can easily cause the fish-scale tube 8 to be flattened during the molding of the outer sheath 2, preventing the air-blowing holes 3 from forming. Simultaneously, damage to the fish-scale tube 8 will also cause sheath material to leak into it, which on one hand damages the air-blowing capability of the air-blowing holes 3, and on the other hand causes fluctuations in the extrusion pressure of the extrusion die, resulting in the failure of the outer sheath 2 molding.

[0040] More preferably, the extrusion inner wall of the first extrusion die 7 in this application is provided with a notch opened along the extrusion direction, and the first extrusion die 7 is also provided with a swinging component in the exit direction. The swinging component is used to drive the formed outer sheath 2 to swing radially. Specifically, the notch is used to form raised ridges on the surface of the outer sheath 2, and the swinging component is used to drive the outer sheath 2 to rotate or swing. After the outer sheath 2 is cooled and formed, the rotating structure drives the outer sheath 2 to rotate or swing radially. The formed outer sheath 2 rotates with the rotating structure, and the outer sheath 2 that has just been extruded from the extrusion die will swing accordingly, thereby forming air-blown ridges 5 arranged in a spiral winding on the surface of the outer sheath 2.

[0041] Furthermore, this application also includes the application of a fish-scale air duct air-blowing microcable in secondary air-blowing construction. Specifically, when blowing the fish-scale air duct air-blowing microcable into the pipe 11, the fish-scale air duct air-blowing microcable is introduced into the pipe 11, and then airflow is introduced in the opposite direction of the fish-scale protrusions 4 to air-blow the fish-scale air duct air-blowing microcable; when it is necessary to expand the capacity and increase the fiber optic arrangement density, the air-blowing microcable is introduced into the air-blowing hole 3 and blown into the fish-scale protrusions 4 in the forward direction.

[0042] Those skilled in the art will readily understand that the above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A method for preparing a fish-scale airway air-blown microcable, characterized in that, Includes the following steps: S1, Traction Light Unit; S2. Preparation of fish scale tube body: Prepare heat shrinkable tape, cut the surface of the heat shrinkable tape along the first direction to form a fish scale-like structure on the surface of the heat shrinkable tape; roll the heat shrinkable tape to form a tube body, the extension direction of the tube body is the same as the extension direction of the fish scale-like structure, and the heat shrinking direction of the heat shrinkable tape is the same as the extension direction of the tube body. S3. Set up a first extrusion die, and introduce the light unit and the fish scale tube into the first extrusion die respectively; S4. The outer sheath is extruded and formed in the first extrusion die. The fish scale-like structure shrinks and curls under the action of the sheath material, forming protrusions that rise in the same direction inside the fish scale tube.

2. The method for preparing the fish-scale airway air-blown microcable according to claim 1, characterized in that, The preparation of the heat-shrinkable tape in step S2 includes: A second extrusion die is set up, and low-shrinkage polyethylene is added inside the second extrusion die; a third extrusion die is set up, and polyoxymethylene is added inside the third extrusion die. The outlet of the third extrusion die is connected to the second extrusion die to extrude and form a low-shrinkage polyethylene sheet with linear polyoxymethylene on the second extrusion die. The sheet is then stretched, cooled, and shaped to form a heat-shrinkable tape.

3. The method for preparing the fish-scale airway air-blown microcable according to claim 1, characterized in that, The step S2, in which the heat-shrinkable tape is rolled to form a tubular structure, specifically includes: Set up a figure-6 mold, roll up the heat shrinkable tape and insert it into the figure-6 mold to form a tubular heat shrinkable tape. Apply hot melt adhesive to the seam of the heat shrinkable tape and bond the heat shrinkable tape to form a fish scale tube.

4. The method for preparing the fish-scale airway air-blown microcable according to claim 2, characterized in that, The low-shrinkage polyethylene has a shrinkage rate of 1% to 1.2% along the axial direction of the fish-scale tube at 180 to 200°C; the polyoxymethylene has a shrinkage rate of 2% to 3.5% along the axial direction of the fish-scale tube at 180 to 200°C.

5. The method for preparing the fish-scale airway air-blown microcable according to claim 1 or 2, characterized in that, The formation of a fish-scale-like structure on the surface of the heat-shrinkable tape specifically includes: A V-shaped cutter is set up, the surface of the V-shaped cutter is heated, the heat shrinkable tape is laid flat, and the V-shaped cutter is cut into the surface of the heat shrinkable tape along the first direction to form a fish scale-like structure on the heat shrinkable tape.

6. The method for preparing the fish-scale airway air-blown microcable according to claim 5, characterized in that, When the V-shaped cutter cuts into the surface of the heat-shrinkable tape, the cutting thickness of the V-shaped cutter is less than the thickness of the heat-shrinkable tape.

7. The method for preparing the fish-scale airway air-blown microcable according to claim 1, characterized in that, The extrusion inner wall of the first extrusion die is provided with a notch opened along the extrusion direction; the outlet direction of the first extrusion die is also provided with a swinging component, which is used to drive the molding outer sheath to swing radially.

8. A fish-scale airway air-blown microcable, prepared by the method for preparing a fish-scale airway air-blown microcable as described in any one of claims 1 to 7, characterized in that, include: At least one optical unit; the optical unit is covered with an outer sheath; the outer sheath has a plurality of air blowing holes along the axial direction, and the inner walls of the plurality of air blowing holes have a plurality of fish scale protrusions along a second direction, the plurality of fish scale protrusions form an inclination angle with the inner walls of the air blowing holes, and the inclination angles of the plurality of fish scale protrusions are in the same direction.

9. The fish-scale airway air-blowing microcable according to claim 8, characterized in that, The outer sheath surface has a plurality of radially protruding air-blowing ridges, which are spirally wound along the axial direction of the outer sheath.

10. The application of a fish-scale air-blowing micro-cable in secondary air-blowing construction, characterized in that, include: The fish-scale airway air-blowing micro-cable as described in claim 8 or 9 is introduced into the pipeline, and airflow is introduced in the opposite direction of the fish-scale protrusions to air-blow the fish-scale airway air-blowing micro-cable. Introduce an air-blowing micro-cable into the air-blowing hole and blow the micro-cable into the fish scale protrusions in the positive direction.

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