Layer stranded optical cable with branching member

Abstract

The application belongs to the technical field of optical cable, and discloses a layer-stranded optical cable with a branch component, which comprises a central reinforcing member, a plurality of loose tubes, a protective layer and an outer sheath, wherein the loose tube is composed of a tube body and an optical fiber, the optical fiber is located in a cavity inside the tube body, and the layer-stranded optical cable further comprises an integrally-formed branch component, the branch component is composed of a base strip and n branch strips, the outer surface of the base strip is in a cylindrical structure, the branch strips are distributed along the inner surface of the base strip towards the center of the base strip, branch cavities are formed between adjacent branch strips, a central cavity is formed between the top ends of the base strip, the central reinforcing member is located in the central cavity, the outer surface of the central reinforcing member is in contact with the branch strips, the protective layer is wrapped outside the base strip, the outer sheath is wrapped outside the protective layer, and n is a positive integer greater than or equal to 2. The application has the following main beneficial technical effects: simple manufacturing, less investment in equipment and site, fast production speed, less manual labor, stable diameter, and more stable and reliable optical fiber performance.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of optical cable, in particular to a layer-stranded optical cable with branch components. BACKGROUND

[0002] The layer-stranded optical cable in the prior art strands a plurality of loose tubes around a central strength member to form a cable core, and adds a required protective layer outside the cable core. The existing defects are that the cable forming equipment is expensive, occupies a large area, has high working noise, consumes much power, has slow production speed, and needs more manpower; on the other hand, the loose tubes of the same specification are not flexible, and the twisting of the loose tubes of different sizes will cause disorder, and the twisted loose tubes cannot be arranged in clockwise or counterclockwise direction after production, and the twisting will cause the loose tubes to be damaged and the optical fiber performance to be degraded. SUMMARY

[0003] To solve the above problems, the purpose of the present application is to disclose a layer-stranded optical cable with branch components, which is realized by the following technical scheme.

[0004] A layer-stranded optical cable with branch components, comprising a central strength member, a plurality of loose tubes, a protective layer, and an outer sheath, wherein the loose tube is composed of a tube body and an optical fiber, the optical fiber is located in the cavity inside the tube body, and the layer-stranded optical cable further comprises integrally formed branch components, the branch components are composed of a base strip and n branch strips, the outer surface of the base strip is in a cylindrical structure, the branch strips are distributed along the inner surface of the base strip towards the center of the base strip, branch cavities are formed between adjacent branch strips, a central cavity is formed between the top ends of the base strip, the central strength member is located in the central cavity, the outer surface of the central strength member is in contact with the branch strips, the protective layer is wrapped outside the base strip, the outer sheath is wrapped outside the protective layer, n is greater than or equal to 2, and n is a positive integer.

[0005] The cross section of the loose tube is a part of a sector with a circular arc, or the cross section of the loose tube is circular.

[0006] At least one loose tube is replaced by an insulating wire, the insulating wire is composed of an insulating layer and a conductor, the insulating layer is wrapped outside the conductor, and the outer surface of the insulating layer is in a cylindrical structure.

[0007] The heights of all the branch strips are equal.

[0008] The sum of the thickness of the base strip and the height of the branch strip multiplied by (2π) is less than the length of the base strip after being developed.

[0009] The branch members are distributed on the inner surface of the base member in a symmetrical or asymmetrical manner. When distributed in a symmetrical manner, a regular structure can be formed; when distributed in an asymmetrical manner, a regular structure can be formed, such as different core numbers and different sizes of inspection sleeves located in different sizes of branch cavities.

[0010] The present application has the following main beneficial technical effects: simple manufacturing, less equipment and site investment, fast production speed, less manual labor, stable diameter, and more stable and reliable optical fiber performance. BRIEF DESCRIPTION OF DRAWINGS

[0011] Figure 1 A schematic diagram of a sectional structure of a part of the embodiment 1 after dissection.

[0012] Figure 2 A schematic diagram of a sectional structure of a part of the embodiment 1 after dissection. Figure 1 A schematic diagram of a sectional structure of a part of the embodiment 1 after dissection.

[0013] Figure 3 A schematic diagram of a sectional structure of a part of the embodiment 1 after dissection.

[0014] Figure 4 A schematic diagram of a sectional structure of a part of the embodiment 1 after dissection. Figure 3 A schematic diagram of a sectional structure of a part of the embodiment 1 after dissection.

[0015] Figure 5 A schematic diagram of a sectional structure of a part of the embodiment 1 after dissection.

[0016] Figure 6 A schematic diagram of a sectional structure of a part of the embodiment 1 after dissection. Figure 5 A schematic diagram of a sectional structure of a part of the embodiment 1 after dissection.

[0017] Figure 7 A schematic diagram of a sectional structure of a part of the embodiment 1 after dissection.

[0018] Figure 8 A schematic diagram of a sectional structure of a part of the embodiment 1 after dissection. Figure 7 A schematic diagram of a sectional structure of a part of the embodiment 1 after dissection.

[0019] Figure 9 A schematic diagram of a sectional structure of a part of the embodiment 1 after dissection.

[0020] Figure 10 A schematic diagram of a sectional structure of a part of the embodiment 1 after dissection.

[0021] Figure 11 A schematic diagram of a sectional structure of a part of the embodiment 1 after dissection.

[0022] Figure 12 A schematic diagram of a sectional structure of a part of the embodiment 1 after dissection. DETAILED DESCRIPTION

[0023] For those skilled in the art to better understand and implement the patent, now combined with the drawings of the specification for the detailed description of the marks in the drawings.

[0024] In the figure: 1 - branch component, 2 - loose tube, 3 - central reinforcing member, 4 - protective layer, 5 - outer sheath, 6 - forming die sleeve, 7 - insulated wire, 11 - base strip, 12 - branch strip, 13 - branch cavity, 14 - central cavity, 21 - tube body, 22 - optical fiber, 61 - die sleeve body, 62 - limit column, 63 - die sleeve cavity, 71 - insulation layer, 72 - conductor.

[0025] Implementation Example 1: see Figures 1 to 9 A layer-stranded optical cable with a branch component, having a central reinforcing member 3, a plurality of loose tubes 2, a protective layer 4, and an outer sheath 5, the loose tube being composed of a tube body 21 and an optical fiber 22, the optical fiber being located in the cavity inside the tube body, and further having an integrally formed branch component 1, the branch component being composed of a base strip 11 and n branch strips 12, the outer surface of the base strip being cylindrical in structure, the branch strips being distributed along the inner surface of the base strip towards the center of the base strip, the branch cavities 13 being formed between adjacent branch strips, and the central cavity 14 being formed between the top ends of the base strip, the central reinforcing member being located in the central cavity, the outer surface of the central reinforcing member being in contact with the branch strips, the protective layer being wrapped around the base strip, and the outer sheath being wrapped around the protective layer, n ≥ 2, n being a positive integer.

[0026] The layer-stranded optical cable with a branch component described above, the cross-section of the loose tube being a part of a sector with a circular arc.

[0027] A method for manufacturing a layer-stranded optical cable with a branch component, comprising the following steps:

[0028] First step: take the original branch component 1, the branch component being composed of a base strip 11 and n branch strips 12, the branch strips being distributed in sequence above the base strip, the branch cavities 13 being formed between adjacent branch strips, the distance between adjacent branch strips being L, the distance between the leftmost branch strip and the left end of the base strip being L / 2, the distance between the rightmost branch strip and the right end of the base strip being L / 2, the sum of the thickness of the base strip and the height of the branch strips being H, the base strip being perpendicular to the branch strips, H < nL / (2π), n ≥ 2, n being a positive integer;

[0029] Second step: forming the branch component: first, put the loose tube into the branch cavity of the original branch component; then, pass the original branch component through the preforming die, so that the original branch component goes straight and curls upward at the end of the preforming die; then, pass the curled branch component into the forming die sleeve 6, pass the central reinforcing member through the center of the forming die sleeve and continuously pull it forward, the forming die sleeve is composed of a die sleeve body 61 with a circular inner surface and a limiting column 62, the die sleeve body has a cylindrical die sleeve cavity 63 inside, and the limiting column is located in the die sleeve cavity, the upper end of the limiting column is integrated with the inner surface of the die sleeve body, so that the left end of the base strip abuts against the left side surface of the limiting column and the right end of the base strip abuts against the right side surface of the limiting column; continuously pull the branch component forward to form the formed branch component, and pull the formed branch component and the central reinforcing member forward together.

[0030] Third step: forming the protective layer: longitudinally or spirally wrap the protective layer 4 outside the formed branch component;

[0031] Fourth step: forming the outer sheath: extrusion wrap the outer sheath 5 outside the protective layer, and the manufacturing of the layer-stranded optical cable with the branch component is completed.

[0032] In the above-mentioned manufacturing method of the layer-stranded optical cable with the branch component, the left end of the base strip abuts against the left side surface of the limiting column, the right end of the base strip abuts against the right side surface of the limiting column, the branch component is continuously pulled forward, and after being pulled through the forming die sleeve, the left end surface of the base strip contacts the right end surface, and a bonding material is applied at the contact position to bond the left end and the right end of the base strip into one body.

[0033] In the above-mentioned manufacturing method of the layer-stranded optical cable with the branch component, the bonding material is the same material as the base strip; the base strip is bonded into one body by high-frequency heating or welding or casting, and the outer surface is maintained as a cylindrical surface.

[0034] Embodiment 2: please see Figure 10 , and refer to Figures 1 to 9 , a layer-stranded optical cable with a branch component, which is basically the same as Embodiment 1, except that the cross section of the loose tube is circular.

[0035] Embodiment 3: please see Figure 11 , and refer to Figures 1 to 10 , a layer-stranded optical cable with a branch component, which is basically the same as Embodiment 2, except that the loose tube is replaced by an insulated wire 7, which is composed of an insulating layer 71 and a conductor 72, the insulating layer wraps the conductor, and the outer surface of the insulating layer is cylindrical.

[0036] Embodiment 4: please see Figure 12 , and refer to Figures 1 to 11A layer-stranded optical cable with branch members, substantially the same as Embodiment 1, except that only n-1 branch strips 12 are present, and the branch strip at the position of the second branch strip from the left end of the base strip to the right is missing, so that different specifications of loose tubes or insulated wires can be placed, expanding the application. Of course, multiple branch strips can be omitted, but at least two are present.

[0037] Of course, multiple branch strips can be omitted, as long as the number of branch strips is not less than 2.

[0038] The manufacturing method of Embodiments 2 to 4 is the same as the manufacturing method of Embodiment 1.

[0039] The layer-stranded optical cable with branch members described in the present application is made of plastic or metal or alloy for both the base strip and the branch strip.

[0040] The layer-stranded optical cable with branch members described in the present application is made of steel or iron or aluminum or copper or glass fiber reinforced plastic for the central strength member.

[0041] The layer-stranded optical cable with branch members described in the present application is made of plastic or metal for the jacket body.

[0042] The layer-stranded optical cable with branch members described in the present application is made of G.652 or G.653 or G.654 or G.655 or G.656 or G.657 or A1a or A1b or A1c or A1d for the optical fiber.

[0043] The layer-stranded optical cable with branch members described in the present application is made of plastic for the insulating layer.

[0044] The layer-stranded optical cable with branch members described in the present application is made of copper or aluminum or copper alloy or aluminum alloy for the conductor.

[0045] The layer-stranded optical cable with branch members described in the present application is made of steel tape or aluminum tape or copper tape or glass fiber reinforced plastic tape or water-blocking tape or polyester tape or non-woven fabric or mica tape for the protective layer.

[0046] The layer-stranded optical cable with branch members described in the present application is made of plastic for the outer sheath.

[0047] In the present application, the protective layer can be omitted, and in addition, multiple protective layers required can be added between the base strip and the outer sheath to achieve various required functions such as strength enhancement, pressure resistance, impact resistance, fire resistance, corrosion resistance, and water resistance.

[0048] Compared with the prior art, the cable manufacturing device is not required in the application, so the production speed is fast, the labor requirement is low, the optical cable diameter is stable when different core numbers of loose tubes are used in the same optical cable, the twisting and jumping of the cable do not occur in the production, and the optical fiber performance is more stable and reliable.

[0049] In the application, the insulated wire can partially or entirely replace the loose tube, the optical cable partially replaced by the insulated wire can also be referred to as an optical and electrical composite cable or an optical and electrical hybrid cable, and the optical cable entirely replaced by the insulated wire can be referred to as an electrical cable.

[0050] The application has the following main beneficial technical effects: simple manufacturing, less investment in equipment and site, fast production speed, low labor requirement, stable diameter, and more stable and reliable optical fiber performance.

[0051] The above-described embodiments are merely preferred technical solutions of the application, and should not be regarded as a limitation on the application. The protection scope of the application should be based on the technical solutions described in the claims, and include equivalent replacement solutions of the technical features of the technical solutions described in the claims. That is, equivalent replacement improvements within this range are also within the protection scope of the application.

Claims

1. A stranded optical cable with branching components, comprising a central reinforcing member (3), multiple loose tubes (2), a protective layer (4), and an outer sheath (5), wherein the loose tubes are composed of a tube body (21) and optical fibers (22), the optical fibers being located within a cavity inside the tube body, characterized in that: The branch component (1) is integrally formed and consists of a base strip (11) and n branch strips (12). The outer surface of the base strip is cylindrical. The branch strips are distributed along the inner surface of the base strip towards the center of the base strip. Branch cavities (13) are formed between adjacent branch strips. A central cavity (14) is formed between the top ends of the base strip. A central reinforcing member is located in the central cavity. The outer surface of the central reinforcing member is in contact with the branch strips. A protective layer is wrapped around the base strip. An outer sheath is wrapped around the protective layer. n≥2, n is a positive integer. The branch strips are distributed symmetrically or asymmetrically on the inner surface of the base strip. When symmetrically distributed, a regular structure is formed. When asymmetrically distributed, an irregular structure is formed. Different core count and size of the loose tube are located in different size branch cavities. The cross section of the loose tube is a part of a sector with a circular arc. The heights of all branch strips are equal. The thickness of the base strip plus the sum of the heights of the branch strips multiplied by (2π) is less than the length of the base strip when unfolded.

2. A layer-stranded optical cable with a branching member according to claim 1, characterized in that: The materials of the base strip and the branch strips are plastic, metal or alloy.

3. A layer-stranded optical cable with a branching member according to claim 2, characterized in that: The material of the central reinforcing member is steel, aluminum, copper or glass fiber reinforced plastic.

4. A layer-stranded optical cable with a branching member according to claim 3, characterized in that: The material of the protective layer is steel strip, aluminum strip, copper strip, glass fiber reinforced plastic strip, water resistant strip, polyester strip, non-woven fabric or mica tape. The material of the outer sheath is plastic.

5. A method of manufacturing a layer-stranded optical cable having a branch member, characterized by The method comprises the following steps: Step 1: Take the original branch component (1) which consists of a base strip (11) and n branch strips (12). The branch strips are distributed on the base strip in sequence. Branch cavities (13) are formed between adjacent branch strips. The distance between adjacent branch strips is L. The distance between the leftmost branch strip and the left end of the base strip is L / 2. The distance between the rightmost branch strip and the right end of the base strip is L / 2. The thickness of the base strip plus the sum of the heights of the branch strips is H. The base strip and the branch strips are perpendicular. H < nL / (2π). n≥2, n is a positive integer. Step 2: Branch component forming: first, place the loose tube into the branch cavities of the original branch component. Then, pass the original branch component through a preforming die so that the original branch component moves straight and curls upwards at the end of the preforming die. Then, pass the curled branch component into a forming die sleeve (6). Pass the central reinforcing member through the center of the forming die sleeve and continuously pull it forward. The forming die sleeve consists of a die sleeve body (61) with a circular inner surface and a limiting column (62). The die sleeve body has a cylindrical die sleeve cavity (63) inside. The limiting column is located in the die sleeve cavity. The upper end of the limiting column is integrated with the inner surface of the die sleeve body. The left end of the base strip is against the left side surface of the limiting column. The right end of the base strip is against the right side surface of the limiting column. Continuously pull the branch component to form a formed branch component. Pull the formed branch component and the central reinforcing member forward together. The cross section of the loose tube is a part of a sector with a circular arc. Step 3: Form the protective layer: wrap the protective layer (4) longitudinally or spirally around the formed branch component. Step 4: Form the outer sheath: extrude and wrap the outer sheath (5) around the protective layer. The manufacturing of the layer-stranded optical cable with the branch component is completed.

6. A method of manufacturing a layer-stranded optical cable having a branch member according to claim 5, characterized by: The left end of the base strip abuts against the left side surface of the limiting column, the right end of the base strip abuts against the right side surface of the limiting column, the branch part is continuously pulled forward, after the branch part is pulled through the forming die sleeve, the left end surface of the base strip contacts with the right end surface, and the combining material is applied at the contact position to combine the left end and the right end of the base strip into one body; the combining material is the same material as the base strip; the base strip is combined into one body by high-frequency heating or welding or casting and the shape of the outer surface is kept as a cylindrical surface.

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