A microcable with an internally expandable airway, its preparation method, and its applications.

Abstract

This invention discloses a blown microcable with internal expandable air channels, 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-like structure; filling the space between the heat-shrinkable tape and the fish-scale-like structure with expanding particles; setting a first extrusion die; and extruding and forming an outer sheath within the first extrusion die, where the expanding particles expand and deform under the action of the sheath material. The preparation method of the blown microcable with internal expandable air channels in this application involves filling the space between the heat-shrinkable tape and the fish-scale-like structure with expanding particles. When the fish-scale tube is extruded into the outer sheath, the expanding particles expand due to heat and lift the fish-scale-like structure. The fish-scale protrusions can obstruct airflow within the air channels, increasing the optical cable laying distance. Simultaneously, the fish-scale air channels can be used for secondary laying of the blown microcable, achieving the purpose of expanding the space of the blown microcable structure within the space of the existing cable in the later stages.

Description

Technical Field

[0001] This invention belongs to the field of optical cable manufacturing technology, specifically relating to an air-blown microcable with an internal expandable air channel, 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 (LANs), and access networks, effectively saving pipeline resources and meeting the needs of network expansion. 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 duct during installation. A large amount of airflow remains within the duct, failing to provide a propulsive effect and wasting significant air-blowing energy, thus limiting the air-blowing distance. Furthermore, once installed, air-blown microcables occupy existing pipeline resources, making subsequent small-scale expansions 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 an air-blown microcable with an internal expandable air channel, so as to solve the problems of low air-blowing efficiency and short air-blowing distance of air-blown microcables prepared by the existing method.

[0005] To achieve the above objectives, the present invention provides a method for preparing a blown microcable with an internally expandable airway, comprising the following steps: S1, Traction Light Unit; S2. Preparation of fish scale tube body: Select heat shrinkable tape, cut the surface of heat shrinkable tape along the first direction to form a fish scale-like structure on the surface of heat shrinkable tape, and fill the space between heat shrinkable tape and fish scale-like structure with expanding particles. 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 expanding particles expand and deform under the action of heating the sheath material, and the fish scale-like structure forms protrusions that rise in the same direction in the fish scale tube body. The angle of the protrusions can be controlled by the amount of expanding particles filled.

[0006] As a further improvement of the present invention, the expanded particles are expanded microspheres.

[0007] As a further improvement of the present invention, step S2 specifically includes: Set a V-shaped cutter, place expansion particles at the groove of the V-shaped cutter, lay the heat shrinkable tape flat, cut the V-shaped cutter into the surface of the heat shrinkable tape along the first direction, and send the expansion particles between the heat shrinkable tape and the fish scale structure.

[0008] This application also provides another method for preparing a blown microcable with an internally expandable airway, which includes the following steps: S1, Traction Light Unit; S2. Select 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, and fill the space between the heat shrinkable tape and the fish scale-like structure with a separating material. S3. Set up a first extrusion die, open a first flow channel and a second flow channel in the first extrusion die, introduce the light unit into the first flow channel, roll the heat shrinkable tape into a fish scale tube, blow air into the fish scale tube, and introduce the fish scale tube into the second flow channel. S4. The outer sheath is extruded and formed in the first extrusion die. The fish scale-like structure softens when heated in the first extrusion die, but due to the presence of the separator, the scale-like structure will not fuse with the substrate. The airflow in the fish scale tube causes the fish scale-like structure to curl up and form fish scale protrusions. The angle of the protrusion can be controlled by the airflow pressure and flow rate.

[0009] As a further improvement of the present invention, the heat shrinkable tape is a thermoplastic tape, and the melting point of the heat shrinkable tape is 120~150℃.

[0010] As a further improvement of the present invention, the heat-shrinkable tape is rolled into a fish-scale tube, and airflow is blown into the fish-scale tube, specifically including: Set up a figure-6 mold, feed the heat-shrinkable tape into the figure-6 mold and roll it into shape. Airflow is introduced into the opening of the figure-6 mold. The heat-shrinkable tape is rolled into a fish-scale tube shape along with the figure-6 mold, and airflow is formed inside the fish-scale tube.

[0011] As a further improvement to the present invention, the following is included before step S4: A preheating device is installed around the outer periphery of the fish-scale tube body to heat the circumference of the fish-scale tube body. The preheating temperature is 150~180℃.

[0012] As a further improvement of the present invention, the separating material in step S2 is one or more of talc, calcium carbonate, and nanofillers.

[0013] This application also includes a blown microcable with an internally expandable airway, comprising: At least one optical unit, the outer periphery of which is covered by an outer sheath, and a plurality of air blowing holes are provided in the inner wall of the outer sheath along the axial direction. A plurality of fish scale protrusions are formed on the inner wall of the plurality of air blowing holes along a first direction, and a filler is provided between the fish scale protrusions and the inner wall of the air blowing holes. The multiple fish-scale protrusions form an angle with the inner wall of the air blowing hole, and the angles of the multiple fish-scale protrusions are oriented in the same direction.

[0014] This application also includes the application of an air-blown microcable with an internally expandable air duct in secondary construction, which includes: A micro-cable with an internal expandable airway is introduced into the pipeline, and airflow is introduced in the opposite direction along the fish scale protrusions. The micro-cable with an internal expandable airway is then deployed by air blowing. 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 air-blown microcable with internal expandable air duct of the present invention has an air-blowing hole in the outer sheath and multiple fish-scale protrusions in one direction formed in the air-blowing hole. When the air-blown microcable with internal expandable air duct 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 air duct, thereby increasing the thrust of the airflow on the air-blown microcable with internal expandable air duct and increasing the laying distance of the air-blown microcable with internal expandable air duct. At the same time, when a secondary laying of the cable is required, an air-blown microcable with a smaller diameter 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-blown microcable to travel in the air-blowing hole, so as to facilitate the secondary laying of the air-blown microcable, improve the utilization rate of the air-blown microcable with internal expandable air duct, and increase the fiber optic laying density.

[0017] (2) The method for preparing the air-blown microcable with internal expandable airway of the present invention involves cutting a fish-scale structure on the surface of a heat-shrinkable tape, and filling the space between the heat-shrinkable tape and the fish-scale structure with expansion particles. When the fish-scale tube is extruded into the outer sheath, the sheath material heats the fish-scale tube. At this time, the expansion particles expand due to heat and lift the fish-scale structure to form a raised shape in the same direction inside the fish-scale tube.

[0018] (3) The method for preparing the air-blown microcable with internal expandable air duct of the present invention is to form a fish scale-like structure by cutting the surface of the heat-shrinkable tape, and fill the space between the heat-shrinkable tape and the fish scale-like structure. When the sheath material heats the surface of the fish scale tube, the fish scale-like structure softens at high temperature and is blown up with the airflow. When the fish scale tube cools and solidifies with the outer sheath, fish scale protrusions that are blown up along the air blowing direction are formed inside the fish scale tube. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the overall structure of the air-blown microcable with an internally expandable airway in an embodiment of the present invention; Figure 2 This is an extrusion schematic diagram of the method for preparing air-blown microcables with internal expandable air channels 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 side cutting of the heat shrinkable tape in an embodiment of the present invention; Figure 5 This is a schematic diagram of the air-blowing laying of an air-blowing micro-cable with an internally expandable air duct in an embodiment of the present invention; Figure 6 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. Fish scale protrusions; 5. Air blow ridge; 6. Water-blocking tape; 7. First extrusion die; 8. Fish scale tube body; 9. Heat shrinkable tape; 10. V-shaped cutter; 11. Fish scale sheet structure; 12. 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 1-6The preferred embodiment of the present invention has an internally expandable air duct air-blowing microcable, which includes: at least one optical unit 1, the outer periphery of which is covered by an outer sheath 2, a plurality of air-blowing holes 3 are formed axially inside the outer sheath 2, a plurality of fish-scale protrusions 4 are formed on the inner wall of the plurality of air-blowing holes 3 along a first direction, and a filler is provided between the fish-scale protrusions 4 and the inner wall of the air-blowing holes 3; at the same time, 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 oriented in the same direction.

[0027] It is worth noting that in this application, the angles of the multiple fish scale protrusions 4 are directed towards the same fish scale protrusions 4 protruding from the inner wall surface of the air blow hole 3, and are arranged on the same side facing the opening direction of the air blow hole 3.

[0028] Preferably, there can be multiple optical units 1 in this application. Multiple optical units 1 can be directly placed in the outer sheath 2 or twisted together with the reinforcing core. Correspondingly, when the optical units 1 in this application are loosely arranged in the outer sheath 2, the outer sheath 2 needs to be formed by vacuum sizing; when the optical units 1 in this application are twisted together, a twisting device needs to be arranged to twist multiple optical units 1 together in the circumferential direction of the reinforcing core.

[0029] The air-blown microcable with internal expandable air duct in this application has an air-blowing hole 3 inside the outer sheath 2, and multiple fish-scale protrusions 4 forming in one direction within the air-blowing hole 3. When laying the air-blown microcable with internal expandable air duct, airflow is injected in the opposite direction of the fish-scale protrusions 4. The fish-scale protrusions 4 form airflow obstruction within the air duct, thereby increasing the thrust of the airflow on the air-blown microcable with internal expandable air duct and increasing the laying distance of the air-blown microcable with internal expandable air duct. At the same time, when secondary cable laying is required, the air-blown microcable can be laid in the forward direction of the fish-scale protrusions 4. The fish-scale protrusions 4 can reduce the contact area between the air-blown microcable and the inner wall of the air-blowing hole 3, so as to facilitate the laying of the air-blown microcable within the air-blowing hole 3 and increase the air-blowing distance. In addition, this laying direction can improve the utilization rate of the air-blown microcable with internal expandable air duct, increase the fiber optic laying density, and facilitate the secondary expansion of network lines.

[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 the multiple air-blowing 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 air-blowing microcable with an internally expandable air channel is placed into the pipe 12, the air-blowing microcable will adhere to the inner wall of the pipe 12, thus causing difficulties in air blowing. This application provides 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 12, the surface of the outer sheath 2 will not be completely adhered to the pipe 12, reducing the contact area between the air-blowing microcable and the pipe 12, reducing the friction between the two, and increasing the air blowing distance of the air-blowing microcable with an internally expandable air channel.

[0033] More preferably, for the air-blown microcable with internal expandable airway in this application, this application includes a method for preparing the air-blown microcable with internal expandable airway, which includes the following steps: S1, Traction Light Unit 1; S2. Preparation of fish scale tube body 8: Select heat shrinkable tape 9, cut the surface of heat shrinkable tape 9 along the first direction to form a fish scale structure 11 on the surface of heat shrinkable tape 9, and fill the space between heat shrinkable tape 9 and fish scale structure 11 with expanding particles. S3. Set up a first extrusion die 7, and introduce the light unit 1 and the fish scale tube 8 into the first extrusion die 7 respectively; S4. The outer sheath 2 is extruded and formed in the first extrusion die 7. The expanding particles expand and deform under the action of heating the sheath material, and the fish scale-like structure 11 forms protrusions that rise in the same direction inside the fish scale tube body 8. The angle of the protrusion can be controlled by the amount of expanding particles filled.

[0034] More preferably, the expanding particles in this application are expanding microspheres. Specifically, the expanding microspheres are thermoplastic hollow polymer microspheres, which consist of a thermoplastic polymer shell and encapsulated liquid alkane gas. The average diameter of the expanding particles is 10~50μm. When the expanding microspheres are heated, the gas pressure inside the shell increases and the thermoplastic shell softens, resulting in a significant increase in the number of expanding microsphere particles; upon cooling, the shell of the expanding microspheres hardens again, at which point the expanding microspheres increase in size and their volume remains fixed. It is worth noting that the expansion temperature of the expanding microspheres is 80~230℃, while the extrusion temperature in the first extrusion die is often around 200℃, perfectly matching the expansion temperature range of the expanding microspheres. Due to the good thermal expansion properties of the expanding microspheres, when the fish-scale tube body 8 is heated, the expanding microspheres expand and lift the fish-scale structure 11 to form a fish-scale protrusion 4 structure within the air blowing hole 3. Furthermore, after cooling, the expanded microsphere will continue to adhere to the fish-scale structure 11, causing the fish-scale structure 11 to continuously lift up, thereby forming a stable air-blown microcable with internal expandable air channels.

[0035] Optionally, the expanding particles in this application are nano-glue. Specifically, nano-glue is a material composed of a mixture of polymeric materials and nanoparticles. It generally exists as a gel at room temperature but expands when heated. High temperatures weaken the interaction between the polymeric materials and nanoparticles in the nano-glue, while the molecular chains of the polymeric materials become more active. The nanoparticles also move more violently due to the heat, thus enhancing the interaction between the nanoparticles and the polymeric materials. Upon cooling, the interaction between the molecular chains of the polymeric materials and the nanoparticles decreases, the molecular chains of the polymeric materials rearrange, and the nanoparticles reassemble and clump together, forming a denser structure and achieving the expansion of the nano-glue's volume. Similarly, after the nano-glue expands, it correspondingly lifts the fish-scale structure 11 to form the fish-scale protrusion 4 structure within the air-blowing hole 3.

[0036] More preferably, step S2 of this application specifically includes: A V-shaped cutter 10 is provided, and expansion particles are placed at the groove of the V-shaped cutter 10. The heat shrinkable tape 9 is laid flat, and the V-shaped cutter 10 is cut into the surface of the heat shrinkable tape 9 along a first direction, so that the expansion particles are delivered between the heat shrinkable tape 9 and the fish scale-like structure 11. The V-shaped cutter 10 is a long strip-shaped cutter 10 structure in the shape of a V. The heat shrinkable tape 9 itself has a certain thickness. The V-shaped cutter 10 cuts along the surface of the heat shrinkable tape 9 at a certain angle, and the surface of the heat shrinkable tape 9 is partially cut. At the same time, the V-shaped cutter 10 is embedded between the heat shrinkable tape 9 and the fish scale-like structure 11, and the expansion particles on the V-shaped cutter 10 are delivered between the heat shrinkable tape 9 and the fish scale-like structure 11. Preferably, the cutting angle of the V-shaped cutter 10 is between 5° and 15°. Since expansion particles need to be embedded between the heat-shrinkable tape 9 and the fish-scale structure 11, in order to avoid the fish-scale structure 11 having an excessively large protrusion angle, which would make it difficult for the heat-shrinkable tape 9 to be rolled into a fish-scale tube 8, this application controls the cutting angle of the V-shaped cutter 10 and controls the amount of expansion particles fed in, so as to ensure the forming of the fish-scale tube 8.

[0037] Furthermore, this application also includes another method for preparing an air-blown microcable with an internally expandable airway, which includes the following steps: S1, Traction Light Unit 1; S2. Select heat shrinkable tape 9, cut the surface of heat shrinkable tape 9 along the first direction to form a fish scale structure 11 on the surface of heat shrinkable tape 9, and fill the space between heat shrinkable tape 9 and fish scale structure 11 with a separating material. S3. Set up a first extrusion die 7, open a first flow channel and a second flow channel in the first extrusion die 7, introduce the light unit 1 into the first flow channel; roll the heat shrinkable tape 9 to form a fish scale tube 8, and blow air into the fish scale tube 8 to introduce the fish scale tube 8 into the second flow channel. S4. The outer sheath 2 is extruded and formed in the first extrusion mold 7. The fish scale-like structure 11 is softened by heat in the first extrusion mold 7. The airflow in the fish scale tube 8 drives the fish scale-like structure 11 to curl up and form fish scale protrusions 4.

[0038] More preferably, the heat-shrinkable tape 9 in this application is a thermoplastic tape, and the melting point of the heat-shrinkable tape 9 is 120~150℃. Specifically, the heat-shrinkable tape 9 in this application is preferably low-density linear PE or TPE. By selecting heat-shrinkable tape 9 with a melting point between 120~150℃, when the heat-shrinkable tape 9 enters the first extrusion die 7, the sheath material is usually processed at around 200℃. At this time, the heat-shrinkable tape 9 tends to soften. Since the first extrusion die 7 itself is relatively short, the heat-shrinkable tape 9 will not collapse in the first die. The fish scale structure 11 is a thin sheet structure, which has a higher degree of softening. Furthermore, due to the separating effect of the separator, when airflow passes through the fish scale tube 8, the fish scale structure 11 bends and curls under the action of airflow. At the same time, the airflow itself can carry away some of the heat on the fish scale structure 11, so that the fish scale structure 11 cools and solidifies, forming curled fish scale protrusions 4 inside the fish scale tube 8.

[0039] Furthermore, in step S3 of this application, the heat-shrinkable tape 9 is rolled into a fish-scale tube 8, and airflow is blown into the fish-scale tube 8, specifically including: A figure-six mold is set up, and heat-shrinkable tape 9 is fed into the figure-six mold and rolled into shape. Airflow is introduced into the opening of the figure-six mold, and heat-shrinkable tape 9 is rolled into fish-scale tube body 8 along with the figure-six mold, forming airflow inside the fish-scale tube body 8. The figure-six mold is mainly used to roll heat-shrinkable tape 9 into a tubular structure. At the same time, due to the forming method of the figure-six mold itself from opening to tightening, the figure-six mold is in an open state at the inlet end of heat-shrinkable tape 9, so that airflow can be injected into the inside of the fish-scale tube body 8, so that the softened fish-scale sheet structure 11 is blown into a raised state by the airflow, so as to form fish-scale protrusions 4 raised in the same direction inside the fish-scale tube body 8.

[0040] Furthermore, as a preferred embodiment of the present invention, the application further includes the following step before step S4: A preheating device is installed around the outer periphery of the fish-scale tube body 8. The fish-scale tube body 8 is preheated around its periphery by the preheating device, and the preheating temperature is 150~180℃. Because the length of the first extrusion die 7 is limited, heating the fish scale tube 8 in such a short time cannot soften the fish scale-like structure 11 on the inner wall of the fish scale tube 8, resulting in the internal airflow being unable to blow the fish scale tube 8 into a warped state. Therefore, this application sets a preheating device on the outer periphery of the fish scale tube 8. After the fish scale tube 8 is formed, the circumferential sidewall of the fish scale tube 8 is heated by the preheating device, so that the fish scale tube 8 is initially softened. When the fish scale tube 8 enters the first extrusion die 7, it is further softened under the action of the sheath material. At this time, the fish scale-like structure 11 and the fish scale tube 8 are separated by the separating material. When the airflow blows through the gap between the fish scale-like structure 11 and the fish scale tube 8, the softened fish scale-like structure 11 warps. At the same time, the airflow temperature is lower than the sheath material temperature, which can initially shape the softened fish scale-like structure 11. After secondary cooling by the subsequent cooling water tank, the fish scale protrusion 4 structure is formed inside the fish scale tube 8.

[0041] Preferably, the separating material in this application is one of talc, calcium carbonate, or nanofiller. The talc, calcium carbonate, or nanofiller themselves do not react with the heat-shrinkable tape 9, and the fish-scale tube 8 itself is used for air blowing. After the fish-scale protrusions 4 cool and solidify, the talc can be carried away by the airflow inside the fish-scale tube 8, so as to facilitate the smooth operation of the airflow inside the fish-scale tube 8.

[0042] Furthermore, this application also includes the application of an air-blowing microcable with an internally expandable air duct in secondary air-blowing construction. Specifically, when blowing the air-blowing microcable with an internally expandable air duct into the pipe 12, the fish-scale air duct air-blowing microcable is introduced into the pipe 12, and then airflow is introduced in the opposite direction of the fish-scale protrusions 4 to air-blow the air-blowing microcable with an internally expandable air duct for air-blowing deployment; when expansion is required to increase the fiber optic arrangement density, the air-blowing microcable is introduced into the air-blowing hole 3 and blown in the forward direction of the fish-scale protrusions 4.

[0043] 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 gas-blowing microcable having an internally expandable airway, characterized by, Includes the following steps: S1, Traction Light Unit; S2. Preparation of fish scale tube body: Select heat shrinkable tape, cut the surface of heat shrinkable tape along the first direction to form a fish scale-like structure on the surface of heat shrinkable tape, and fill the space between heat shrinkable tape and fish scale-like structure with expanding particles. 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 expanding particles expand and deform under the action of the sheath material, and the fish scale-like structure forms protrusions that rise in the same direction in the fish scale tube.

2. The method for preparing a blown microcable with an internally expandable airway according to claim 1, characterized in that, The expanded particles are expanded microspheres.

3. The method for preparing a blown microcable with an internally expandable airway according to claim 1, characterized in that, Step S2 specifically includes: Set a V-shaped cutter, place expansion particles at the groove of the V-shaped cutter, lay the heat shrinkable tape flat, cut the V-shaped cutter into the surface of the heat shrinkable tape along the first direction, and send the expansion particles between the heat shrinkable tape and the fish scale structure.

4. A method for preparing a blown microcable with an internally expandable airway, characterized in that, Includes the following steps: S1, Traction Light Unit; S2. Select 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, and fill the space between the heat shrinkable tape and the fish scale-like structure with a separating material. S3. Set up a first extrusion die, open a first flow channel and a second flow channel in the first extrusion die, introduce the light unit into the first flow channel; roll the heat shrinkable tape to form a fish scale tube, and blow air into the fish scale tube to introduce the fish scale tube into the second flow channel. S4. The outer sheath is extruded and formed in the first extrusion die. The fish scale-like structure is softened by heat in the first extrusion die. The airflow in the fish scale tube causes the fish scale-like structure to curl up and form fish scale protrusions.

5. The method for preparing a blown microcable with an internally expandable airway according to claim 4, characterized in that, The melting point of the heat-shrinkable tape is 120~150℃.

6. The method for preparing a blown microcable with an internally expandable airway according to claim 4, characterized in that, Step S3, which involves rolling the heat-shrinkable tape to form a fish-scale tube and blowing air into the fish-scale tube, specifically includes: Set up a figure-6 mold, feed the heat-shrinkable tape into the figure-6 mold and roll it into shape. Airflow is introduced into the opening of the figure-6 mold. The heat-shrinkable tape is rolled into a fish-scale tube shape along with the figure-6 mold, and airflow is formed inside the fish-scale tube.

7. The method for preparing a blown microcable with an internally expandable airway according to claim 6, characterized in that, The procedure preceding step S4 also includes: A preheating device is installed around the outer periphery of the fish-scale tube body to preheat the circumference of the fish-scale tube body. The preheating temperature is 150~180℃.

8. The method for preparing a blown microcable with an internally expandable airway according to claim 4, characterized in that, The separating material in step S2 is one or more of talc, calcium carbonate, and nanofillers.

9. A microcable with an internally expandable airway, characterized in that, include: At least one optical unit, the outer periphery of which is covered by an outer sheath, and a plurality of air blowing holes are provided in the inner wall of the outer sheath along the axial direction. A plurality of fish scale protrusions are formed on the inner wall of the plurality of air blowing holes along a first direction, and a filler is provided between the fish scale protrusions and the inner wall of the air blowing holes. The multiple fish-scale protrusions form an angle with the inner wall of the air blowing hole, and the angles of the multiple fish-scale protrusions are oriented in the same direction.

10. The application of an air-blown microcable with an internally expandable air duct in secondary construction, characterized in that, include: The air-blowing microcable with an internal expandable airway as described in claim 9 is introduced into the pipeline, and airflow is introduced in the opposite direction along the fish scale protrusions to air-blow the air-blowing microcable with an internal expandable airway. 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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