Bundling pipe capable of sleeving optical fibers and production device

Abstract

The utility model discloses a bundling tube capable of sleeving optical fibers, which comprises a plurality of inner tubes, the peripheries of the adjacent inner tubes are arranged in an externally tangent manner, and an outer tube formed by extrusion is wound on the outer sides of the plurality of inner tubes, so that the inner tubes and the outer tube form an integral bundling tube structure. The utility model further discloses a production device for the bundling pipe, the production device comprises an outer-layer pipe mold, an inner pipe inlet, a cavity and a bundling pipe outlet which are sequentially arranged in the outer-layer pipe mold, a feeding port used for feeding materials is formed in the side face of the cavity, a heat insulation plate is arranged at the inner pipe inlet, and a pipe passing through hole corresponding to the inner pipe is formed in the heat insulation plate. The utility model has the advantages that the extrusion molding of the inner pipe and the outer pipe which are made of different materials can be realized, and the molding efficiency of the bundling pipe is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of cluster tubes, in particular to a cluster tube capable of housing optical fibers and a production device. Background Art

[0002] Optical fiber cables play a great role in the transmission of civil and military signals, and are gradually being promoted to all walks of life. Currently, most optical fiber cables must be covered with a multi-layer protective structure before use. The structure is complex and the cost is high. The protective structure is provided as a tube for covering the optical fiber cable, and a cluster tube is usually used. For example, in the Chinese patent literature, there is a patent for "Low Smoke Halogen-Free Microtube Cluster Tube" disclosed with publication number CN107037555A. The low smoke halogen-free microtube cluster tube disclosed in the application includes an outer sheath and at least two microtubes. The microtubes are arranged in the outer sheath. The material of the outer sheath is low smoke halogen-free flame retardant plastic. The inner wall of the outer sheath is provided with a solid lubricating silicon material layer, and the inner wall of the microtube is also provided with a solid lubricating silicon material layer. The application also discloses a production process for the cluster tube, in which the outer sheath and the microtubes of the same material are extruded together.

[0003] The shortcoming of the existing technology is that the production process can only be applied to the scheme where the outer sheath and microtube are made of the same material. The outer sheath and microtube of different materials cannot be extruded together. In the process of secondary molding of bundled tubes, large-diameter tubes and small-diameter tubes are usually processed separately first, and finally combined into bundled tubes by glue and adhesive, which has low processing efficiency. Utility Model Content

[0004] In order to overcome the above-mentioned deficiencies in the prior art, the present invention provides a cluster tube capable of housing optical fibers and a production device thereof, which can realize extrusion molding of inner tubes and outer tubes of different materials, thereby improving the molding efficiency of the cluster tube.

[0005] In order to achieve the above-mentioned purpose, the present utility model adopts the following technical solutions.

[0006] A bundle tube capable of housing optical fibers comprises a plurality of inner tubes, the outer peripheries of adjacent inner tubes being circumscribed, and the outer sides of the plurality of inner tubes being surrounded by an extruded outer tube so that the inner and outer tubes form an integral bundle tube structure.

[0007] The outer tube is directly extruded on the outside of the inner tube, which not only realizes the connection between the outer tube and the inner tube, but also realizes the limitation between the inner tubes. It can realize the rapid molding of inner tubes and outer tubes of the same material, and can also realize the rapid molding of inner tubes and outer tubes of different materials, thereby improving the molding efficiency of the bundled tube.

[0008] Preferably, four inner tubes are provided, and the four inner tubes are arranged in a rectangular array to protect four optical fibers and cables.

[0009] A production device for the above-mentioned optical fiber-capable cluster tube includes an outer tube mold, in which an inner tube inlet, a cavity and a cluster tube outlet are arranged in sequence, a feed port for material entry is provided on the side of the cavity, and the inner tube inlet is provided with a heat insulation board, and the heat insulation board is provided with a tube through hole corresponding to the inner tube.

[0010] The cluster tube production device disclosed in this application is capable of forming an outer tube outside an inner tube, forming several inner tubes into one piece while retaining a margin of movement on one side of the inner tube to achieve reliable fit with optical fiber cables. The heat shield prevents the heat from the molten material in the outer tube from being blocked when it is transferred to the heat shield, preventing heat from being lost to the outside of the heat shield and preventing material from leaking outside the outer tube mold. Furthermore, the heat shield is provided with tube through-holes, which correspond to the positions of the limit tube through-holes one by one, thereby limiting the inner tube during cluster tube production and ensuring the quality of the cluster tube molding.

[0011] Preferably, the outer tube mold comprises a first mold and a second mold, and the mold cavity is provided on opposite sides of the first mold and the second mold. The outer tube mold and the mold cavity adopt a split structure in which the first mold and the second mold are installed in a split manner, which facilitates the molding and manufacturing of the mold cavity.

[0012] Preferably, the first mold and the second mold are provided with matching boss and groove matching structures on the opposite sides to form a curved sealing surface, thereby improving the anti-overflow capability of the mold cavity.

[0013] Preferably, a first cavity is provided in the first mold, and a second cavity is provided in the second mold. The first and second cavities are combined to form a mold cavity. The first cavity is a cylindrical cavity, and the second cavity is a frustum cavity with a tapered angle facing away from the cylindrical cavity. The frustum cavity has the function of gathering material, thereby improving the molding quality of the outer tube.

[0014] Preferably, an inner tube bundling device is provided on the outer side of the heat insulation board, and the inner tube bundling device is provided with a first guide hole corresponding to the tube through hole. The first guide hole guides the inner tube outside the heat insulation board to facilitate the inner tube to enter the outer tube mold.

[0015] Preferably, a core mold is provided in the mold cavity, the core mold is supported and fixed in the first cavity, the core mold is provided with a conical surface facing and extending into the first cavity, a feed gap is provided between the conical surface and the cavity wall of the truncated cone cavity to connect the feed port, the conical surface of the core mold is coaxially arranged with the truncated cone cavity, a second guide hole is provided in the core mold for the inner tube to pass through, and the second guide hole tangentially squeezes the side wall of the inner tube together. The core mold supports the inner tube, and the feed gap between the core mold and the truncated cone cavity can achieve material aggregation and uniform distribution. When the molten material flows through the feed gap, it can also preheat the inner tube, causing the inner tube to expand slightly, better cooperating with the compression and guiding effect of the second guide hole. When the inner tube moves outward from the second guide hole, it contacts the outer tube material. The outer tube material is laid outside the inner tube to form an outer tube, but due to the tangential extrusion between the inner tubes, the outer tube material cannot flow into the inner part between the inner tubes or the outer tube axis position, ensuring that there is a movable margin inside the inner tube, thereby achieving the cooperation between the inner tube and the optical fiber cable. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a schematic structural diagram of a bundle tube capable of housing optical fibers disclosed in one embodiment of the present utility model.

[0017] Figure 2 It is a structural schematic diagram of a production device for a bundled tube capable of housing optical fibers disclosed in one embodiment of the present utility model.

[0018] Figure 3 It is a structural schematic diagram of a heat insulation board in a production device for a cluster tube capable of housing optical fibers disclosed in one embodiment of the present utility model.

[0019] Figure 4 It is a structural schematic diagram of a core mold in a production device for a cluster tube capable of housing optical fibers disclosed in one embodiment of the present utility model.

[0020] In the figure: inner tube 1, outer tube 2, inner tube inlet 3, cavity 4, cluster tube outlet 5, feed port 6, heat insulation plate 7, tube through hole 8, inner tube clustering device 9, first guide hole 10, first mold 11, second mold 12, sealing surface 13, first cavity 14, second cavity 15, core mold 16, tapered surface 17, second guide hole 18, feed gap 19. DETAILED DESCRIPTION

[0021] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0022] One embodiment of the present invention discloses a bundled tube capable of housing optical fibers, such as Figure 1 As shown, a bundle tube that can be used to sheath optical fibers includes several inner tubes 1, the outer circumferences of adjacent inner tubes 1 are circumscribed, and the outer sides of several inner tubes 1 are surrounded by extruded outer tubes 2 so that the inner tubes 1 and the outer tubes 2 form an integral bundle tube structure.

[0023] The inner tubes 1 are arranged tangentially in a circular array and then the outer tube 2 is directly extruded on the outside of the ring structure, so that the inner tube 1 and the outer tube 2 form a reliable overall structure with high production efficiency. At the same time, the inner side of the ring structure formed by the inner tube 1 is hollow, which maintains the deformation space inside the inner tube 1 and cooperates with the deformation margin of the inner tube 1, making it convenient to realize the coordinated setting of optical fiber cable and bundle tube.

[0024] In this embodiment, four inner tubes 1 are provided, and the four inner tubes 1 are arranged in a rectangular array.

[0025] As a simple replacement of the above solution, the number of the inner tubes 1 can be 2, 3, 5, etc.

[0026] One embodiment of the present invention discloses a production device for the above-mentioned optical fiber bundle tube, such as Figures 2 to 4 As shown, it includes an outer tube mold, in which an inner tube inlet 3, a cavity 4 and a cluster tube outlet 5 are arranged in sequence. A feed port 6 for material entry is provided on the side of the cavity 4. The inner tube inlet 3 is provided with a heat insulation plate 7, and the heat insulation plate 7 is provided with a tube through hole 8 corresponding to the inner tube 1.

[0027] During cluster tube production, four small-diameter inner tubes 1 are first formed using a small extruder. These are then coated with an outer layer by a large extruder positioned perpendicular to the direction of movement of the inner tubes 1 and an outer tube mold. The outer tube mold serves as the die of the large extruder. The four inner tubes 1 enter the mold cavity 4 from the inner tube inlet 3 through the tube through-hole 8. After being coated on the outside, they exit the die through the cluster tube outlet 5. The cluster tube is then cooled by water spray and shaped to the required size. The outer tube 2 and inner tube 1 form a tight structure. The shaped cluster tube continues to extend under the action of a traction machine. The length can be customized to the length of the optical fiber cable. The formed cluster tube can be wound onto a fixed disk. The outer tube 2 is made of high-density polyethylene, while the inner tube 1 is made of low-density polyethylene. In this embodiment, the tube through hole 8 on the insulation board 7 can provide limitation and guidance when the inner tube 1 passes through and enters the cavity 4, thereby realizing the arrangement of the inner tube 1 and facilitating the extrusion production of the outer tube 2 on the outside of the inner tube 1. The insulation board 7 has a heat insulating effect and can prevent the material in the cavity 4 from overflowing, thereby ensuring the utilization rate of the material.

[0028] Further, such as Figure 2 As shown, an inner tube clustering device 9 is provided on the outside of the heat shield 7, and the inner tube clustering device 9 is provided with a first guide hole 10 corresponding to the tube through hole 8. The first guide hole 10 can guide the inner tube 1, so that the inner tubes 1 can be reliably inserted into the mold cavity 4 in an array, ensuring the subsequent processing of the clustered tubes. It should be noted that Figure 2 The cross section of the inner tube clustering device 9 and the cross section of the heat insulation board 7 are cross sections through the axes of the two longitudinally arranged first guide holes 10, while the cross section of the outer tube mold is the axial cross section of the outer tube mold.

[0029] The outer tube mold includes a first mold 11 and a second mold 12, with a cavity 4 provided on opposite sides of the first mold 11 and the second mold 12. Furthermore, to ensure reliable extrusion of the cavity 4 and prevent overflow between the first mold 11 and the second mold 12, mating boss and groove structures are provided on opposite sides of the first mold 11 and the second mold 12 to form a curved sealing surface 13.

[0030] The outer tube mold is formed by assembling the first mold 11 and the second mold 12 in a spliced ​​manner, which facilitates the construction of the cavity 4. At the same time, the setting of the sealing surface 13 can seal the connection position of the first mold 11 and the second mold 12 to prevent material from overflowing and avoid waste.

[0031] As one embodiment of the present invention, a production device for the above-mentioned optical fiber bundle tube is disclosed, such as Figure 2 and Figure 4 As shown, a first cavity 14 is provided in the first mold 11, and a second cavity 15 is provided in the second mold 12. The first cavity 14 and the second cavity 15 are combined to form a mold cavity 4. The first cavity 14 is a cylindrical cavity, and the second cavity 15 is a truncated cone cavity with a taper angle facing away from the cylindrical cavity. The truncated cone cavity has the function of gathering materials. A core mold 16 is provided in the mold cavity 4. The core mold 16 is supported and fixed in the first cavity 14. The core mold 16 is provided with a conical surface 17 facing and extending into the first cavity 14. A feed gap 19 is provided between the conical surface 17 and the cavity wall of the truncated cone cavity to connect to the feed port 6. The conical surface 17 of the core mold 16 is coaxially arranged with the truncated cone cavity. A second guide hole 18 is provided in the core mold 16 for the inner tube 1 to pass through. The second guide hole 18 tangentially squeezes the side walls of the inner tube 1 together.

[0032] The structure of the second guide hole 18 is as follows Figure 4 As shown, it is a hollow four-leaf clover, which limits the four inner tubes 1 and compresses the side walls of the four inner tubes 1 into a tangent setting. This prevents the molten outer tube 2 material from entering the annular structure surrounded by the inner tubes 1 during extrusion production, ensuring the elastic deformation space inside the inner tube 1. The core mold 16 supports the inner tube 1, and the feeding gap 19 between the core mold 16 and the truncated cone cavity can achieve material aggregation and uniform distribution. When the molten material flows through the feeding gap 19, it can also preheat the inner tube 1, causing the inner tube 1 to expand slightly, better cooperating with the compression and guiding effect of the second guide hole 18. When the molten material enters the cavity 4 from the feed port 6, it is gathered and guided through the truncated cone-shaped feeding gap 19, achieving reliable distribution around the inner tube 1 and ensuring the quality of the outer tube 2 molding.

Claims

1. A bundled tube capable of housing optical fibers, characterized in that: The utility model comprises a plurality of inner tubes, the outer peripheries of adjacent inner tubes are circumscribed, and the outer sides of the plurality of inner tubes are surrounded by an extruded outer tube so that the inner tubes and the outer tubes form an integral bundled tube structure.

2. The optical fiber bundle tube according to claim 1, characterized in that: There are four inner tubes, which are arranged in a rectangular array.

3. A device for producing a bundled tube for optical fibers as claimed in claim 1 or 2, characterized in that: It includes an outer tube mold, which is provided with an inner tube inlet, a cavity and a bundled tube outlet arranged in sequence. A feed port for material entry is provided on the side of the cavity. The inner tube inlet is provided with an insulation board, and the insulation board is provided with a through hole corresponding to the inner tube.

4. The production device of a bundled tube capable of housing optical fibers according to claim 3, wherein: The outer tube mold comprises a first mold and a second mold that are assembled together, and cavities are provided on opposite sides of the first mold and the second mold.

5. The production device of a bundled tube capable of housing optical fibers according to claim 4, characterized in that: The opposite sides of the first mold and the second mold are provided with matching boss and groove matching structures to form a bent sealing surface.

6. The production device of a bundle tube capable of housing optical fibers according to claim 4 or 5, characterized in that: A first cavity is provided in the first mold, and a second cavity is provided in the second mold. The first cavity and the second cavity are combined to form a mold cavity. The first cavity is a cylindrical cavity, and the second cavity is a frustum cavity with a taper angle facing away from the cylindrical cavity.

7. The production device for a bundled tube capable of housing optical fibers according to claim 3, wherein: An inner tube bundling device is provided on the outer side of the heat insulation board, and the inner tube bundling device is provided with a first guide hole corresponding to the tube through hole.

8. The production device for a bundled tube capable of housing optical fibers according to claim 6, wherein: A core mold is provided in the mold cavity, and the core mold is supported and fixed in the first cavity. The core mold is provided with a conical surface facing and extending into the first cavity. A feed gap connecting the conical surface and the cavity wall of the truncated cone cavity is provided. The conical surface of the core mold is coaxially arranged with the truncated cone cavity. A second guide hole for the inner tube to pass through is provided in the core mold, and the second guide hole squeezes the side walls of the inner tube together tangentially.

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