An impact-resistant hybrid hollow and solid core fiber optic cable and method of making the same

Abstract

The application belongs to the technical field of cable, and discloses an impact-resistant hollow-core and solid-core hybrid fiber optical cable, which has a sheath layer and an elastic framework, the elastic framework comprises a framework center body and n elastic framework strips, the side walls of the framework strips are uniformly provided with a plurality of elliptical fiber accommodating grooves, and the fiber accommodating grooves can accommodate a mixed fiber bundle of a plurality of hollow-core optical fibers and solid-core optical fibers; the elastic framework can make the optical cable have better impact resistance, the fiber accommodating grooves are communicated with the second arc-shaped cavities through the expansion gaps, the fiber accommodating grooves are filled with water-blocking gel, the optical cable not only has better waterproof performance, but also can further improve the impact resistance of the optical cable, and the water-blocking gel can flow from the fiber accommodating grooves into the second arc-shaped cavities when the optical cable is subjected to extrusion and impact, so that the deformation of the fiber accommodating grooves after being subjected to extrusion and impact is prevented, the local impact stress of the optical fiber is avoided, the optical fiber is prevented from being broken, and the optical fiber is better protected; and the application also discloses a preparation method.

Description

Technical Field

[0001] This invention belongs to the field of cable technology, and in particular discloses an impact-resistant hybrid optical fiber cable with hollow and solid cores and its preparation method. Background Technology

[0002] Hollow-core optical fiber is a new type of optical fiber product that uses air instead of glass core as the transmission medium, and it plays an important role in the construction of artificial intelligence computing infrastructure.

[0003] Hollow-core optical fibers have a more complex structure than ordinary optical fibers. After forming, local defects are more likely to cause breakage or overall failure, thus affecting the operation of artificial intelligence computing infrastructure. Therefore, better protection is needed for hollow-core optical fibers.

[0004] In the prior art, CN115755303A describes an optical cable comprising: a sheath structure, a three-dimensional support member, a core tube, and optical fibers; a central cavity is provided at the core of the sheath structure; the three-dimensional support member is coaxially disposed in the central cavity with the sheath structure, comprising a cylindrical central tube portion and several three-dimensional support ribs circumferentially distributed on the outer wall of the central tube; the three-dimensional support ribs are arranged radially along the optical cable, with their inner ends bent towards the circumferential side and tangentially fixed to the outer wall of the central tube, and their outer ends abutting against the inner wall of the central cavity, dividing the central cavity into several sub-cavities, each sub-cavity containing a sponge filling strip; the sponge filling strip has an optical fiber groove for mounting the optical fibers. This invention's optical cable, through a reasonable structural arrangement, effectively achieves lightweighting of the optical cable and significantly improves its mechanical properties without the need for reinforcing members, giving the optical cable excellent pressure and impact resistance.

[0005] The existing technologies mentioned above have the following drawbacks: 1. They have complex structures and low production efficiency for optical cables; 2. It is inconvenient to obtain optical fibers for construction; 3. The protection effect on optical fibers is relatively weak. Summary of the Invention

[0006] To address the aforementioned problems, the present invention aims to disclose an impact-resistant hybrid hollow and solid optical fiber cable and its manufacturing method, which is achieved using the following technical solutions.

[0007] An impact-resistant hybrid hollow and solid optical fiber cable includes a sheath layer and an elastic skeleton, wherein the elastic skeleton is located inside the sheath layer; The sheath layer consists of n identical arc-shaped sheath walls, n≥3, all arc-shaped sheath walls are connected end to end, and the connection point of two adjacent arc-shaped sheath walls is recessed towards the center of the sheath layer; The elastic skeleton includes a skeleton center body and n elastic skeleton strips. The n skeleton strips are evenly distributed around the skeleton center body. One end of the skeleton strip is connected to the skeleton center body. The skeleton strip can bend clockwise into an arc shape under force and form a second arc-shaped cavity. The sidewall of the skeleton strip on the clockwise side is uniformly provided with multiple elliptical openings for fiber optic slots. The skeleton strips are elastic and fit tightly against the inner wall of the corresponding arc-shaped sheath. The fiber optic slot contains a bundle of multiple hollow and solid optical fibers, wherein the solid optical fibers are of the specifications of G.652D, G.654E or G.655 optical fibers. The gaps within the sheath layer are filled with water-resistant gel.

[0008] The aforementioned shock-resistant hybrid hollow and solid optical fiber cable has an optical fiber slot connected to the second arc-shaped cavity via a telescopic gap, and the diameters of both the hollow and solid optical fibers are larger than the width of the telescopic gap.

[0009] The aforementioned shock-resistant hybrid hollow and solid optical fiber cable has an optical unit in each second arc-shaped cavity, and multiple hybrid hollow and solid optical fibers are arranged in the optical unit. The optical unit is connected to the connection point on the clockwise side through a connector.

[0010] The aforementioned shock-resistant hybrid hollow and solid fiber optic cable has an arc-shaped connector with the same radius as the arc-shaped sheath wall. The connector and the adjacent clockwise side of the arc-shaped sheath wall are located on the same circumference.

[0011] The aforementioned shock-resistant hybrid hollow and solid fiber optic cable has a connector cavity formed between the other end of any one skeleton bar and the adjacent clockwise skeleton bar.

[0012] The aforementioned shock-resistant hybrid hollow and solid fiber optic cable has an inner sleeve as its optical unit. An optical fiber cavity is formed inside the inner sleeve, and a bundle of multiple hybrid hollow and solid optical fibers is located within the optical fiber cavity. A first arc-shaped cavity is formed between the inner sleeve and the corresponding arc-shaped sheath wall. A skeleton strip is located within a corresponding first arc-shaped cavity. The width of the first arc-shaped cavity is greater than the width of the skeleton strip. The inner sleeve does not contact the corresponding skeleton strip, and the connector is located within the corresponding connector receiving cavity.

[0013] The aforementioned shock-resistant hybrid hollow and solid fiber optic cable uses a butterfly unit as its optical unit. The butterfly unit comprises a butterfly unit sheath, two butterfly unit reinforcements, and a bundle of mixed hollow and solid fibers. The two butterfly unit reinforcements and the bundle of mixed hollow and solid fibers are located within the butterfly unit sheath, and between the two butterfly unit reinforcements. The line connecting the axes of the two butterfly unit reinforcements is the long axis of the butterfly unit. The sidewalls of the butterfly unit sheath at both ends of the long axis are arc-shaped. A first arc-shaped cavity is formed between one arc-shaped sidewall of the butterfly unit sheath and the corresponding arc-shaped sheath wall. The skeleton strip is located within the corresponding first arc-shaped cavity. The butterfly unit does not contact the corresponding skeleton strip, and the connector is located within the corresponding connector receiving cavity.

[0014] The aforementioned shock-resistant hybrid hollow and solid fiber optic cable has an expansion gap that is aligned with the major axis of the ellipse of the fiber optic slot.

[0015] The aforementioned shock-resistant hybrid hollow and solid fiber optic cable has a central reinforcing member inside the core of its skeleton.

[0016] A method for preparing the above-mentioned shock-resistant hollow and solid hybrid optical fiber cable includes the following steps: Step 01: Extruding elastic skeleton, the elastic skeleton includes a skeleton center body and n elastic skeleton strips, n≥3. There is a skeleton center body inside the skeleton center body, and all skeleton strips are distributed at equal intervals around the skeleton center body. One end of the skeleton strip is connected to the skeleton center body, and the skeleton strips are straight strips. Step 02: Pass the elastic skeleton from Step 01 through the shaping mold. The shaping mold includes a mold body, n edge-rolling molds, n mandrels, and two mounting components. The mounting components are fixed to the mold body. The mold body is a hollow frustum shape. The edge-rolling mold is fixed to the inner wall of the mold body. The front opening of the edge-rolling mold has a large diameter, and the rear opening has a small diameter. After unfolding, the edge-rolling mold is a 1 / 3 ring. The mandrel is located inside the corresponding edge-rolling mold. The mandrel is coaxial with the edge-rolling mold. A third arc-shaped cavity is formed between the mandrel and the edge-rolling mold. A central hole is formed between the n mandrels. One side of the edge-rolling mold away from the central hole is connected and fixed to the mandrel through a positioning connection component. An extension mold is connected to the rear opening of the edge-rolling mold. The cross-section of the extension mold is the same as the cross-section of the rear opening of the edge-rolling mold. The connection between the extension mold and the rear opening of the edge-rolling mold is smooth. When the elastic skeleton passes through the shaping mold, the elastic skeleton enters from the front end of the curling mold, the skeleton center body passes through the central hole, and the skeleton strip passes through the corresponding third arc cavity. The skeleton strip gradually bends into an arc shape in the third arc cavity until the two side walls of the expansion gap are in contact. When the elastic skeleton passes through the shaping mold, a bundle of optical fibers mixed with hollow optical fibers and solid optical fibers is simultaneously placed in the optical fiber cavity, and the optical fiber cavity is filled with water-blocking gel. The extension die passes through the central cavity of the extrusion mold core of the sheath layer. During the extrusion molding of the sheath layer, the skeleton strip is directly located inside the corresponding arc-shaped sheath wall. After passing through the extension die, the skeleton strip automatically expands outward to form an expansion gap, and the skeleton strip is attached to the corresponding arc-shaped sheath wall.

[0017] The present invention has the following beneficial effects: 1. The elastic skeleton is bent to form multiple fiber optic slots, and multiple fiber optic slots are formed in one step, which is convenient and quick.

[0018] 2. When retrieving the optical fiber from the optical fiber slot, simply break the corresponding arc-shaped sheath wall. Due to the internal stress of the skeleton strip, the skeleton strip will automatically unfold, allowing the optical fiber to be retrieved. Compared to the loose tube structure, retrieving the optical fiber is more convenient.

[0019] 3. The skeleton strips are elastic, which makes the optical cable more impact resistant.

[0020] 4. Setting an expansion gap not only further improves the impact resistance of the optical cable, but also allows the hydroblocking gel to flow from the fiber optic slot into the second arc-shaped cavity when the optical cable is subjected to compression and impact. This prevents the fiber optic slot from deforming after being compressed and impacted, thus preventing the optical fiber from being subjected to excessive local short-term impact pressure and breaking.

[0021] 5. After the optical cable is assembled, the fiber optic slots are elliptical, and the major axes of all the fiber optic slots intersect at the center of the arc-shaped skeleton strip. Compared with a circular structure, it has better compressive strength.

[0022] 6. The inner sleeve or butterfly unit is integrally formed with the sheath layer through connectors, which improves production efficiency. The arc-shaped skeleton strip also provides further protection for the inner sleeve or butterfly unit.

[0023] 7. When the elastic skeleton passes through the shaping mold, the optical fiber is simultaneously placed into the optical fiber cavity and filled with water-blocking gel. The water-blocking gel not only provides water-blocking effect, but also provides lubrication when the elastic skeleton passes through the shaping mold.

[0024] 8. The fiber optic slot openings of the skeleton strip face inwards, providing better protection for the optical fiber compared to traditional skeleton-type optical cables. Attached Figure Description

[0025] Figure 1 This is a three-dimensional structural schematic diagram of a segment of Embodiment 1 of the present invention.

[0026] Figure 2 This is the front view of Embodiment 1 of the present invention.

[0027] Figure 3 This is a front view of the sheath layer of Embodiment 1 of the present invention.

[0028] Figure 4 This is a front view of the elastic skeleton after bending in Embodiment 1 of the present invention.

[0029] Figure 5 This is a three-dimensional structural schematic diagram of a segment of Embodiment 2 of the present invention.

[0030] Figure 6 This is the front view of Embodiment 2 of the present invention.

[0031] Figure 7 This is a front view of the sheath layer in Embodiment 2 of the present invention.

[0032] Figure 8 This is a front view of the elastic skeleton after bending and the optical fiber in Embodiment 2 of the present invention.

[0033] Figure 9 This is a front view of the elastic skeleton in Embodiment 4 of the present invention, which is curved.

[0034] Figure 10 This is a three-dimensional structural schematic diagram of the shaping mold of Embodiment 4 of the present invention.

[0035] Figure 11 This is a front view of the shaping mold of Embodiment 4 of the present invention.

[0036] Figure 12 This is a three-dimensional structural diagram of the mold core of the shaping mold and the sheath extrusion mold of Embodiment 4 of the present invention after being combined and fixed.

[0037] In the figure, the corresponding figures are as follows: 1. Sheath layer, 11. Arc-shaped sheath wall, 12. First arc-shaped cavity, 13. Connector, 14. Inner sleeve, 15. Fiber cavity, 16. Butterfly unit sheath, 17. Butterfly unit reinforcement, 2. Elastic skeleton, 21. Skeleton strip, 22. Fiber cavity, 23. Expansion gap, 24. Second arc-shaped cavity, 25. Central reinforcement, 26. Connector cavity, 3. Fiber bundle, 4. Mold body, 5. Mounting component, 6. Edge curling mold, 7. Extension mold, 8. Third arc-shaped cavity, 9. Mandrel, 10. Central hole, 11. Positioning connection component. Detailed Implementation

[0038] Example 1: As Figures 1 to 4 An impact-resistant hybrid hollow and solid optical fiber cable includes a sheath layer 1 and an elastic skeleton 2, wherein the elastic skeleton 2 is located inside the sheath layer 1. The sheath layer 1 includes four identical arc-shaped sheath walls 11, which are connected end to end. The connection point of two adjacent arc-shaped sheath walls is recessed towards the center of the sheath layer 1. Each arc-shaped sheath wall 11 has a circular inner tube 14 inside its arc. An optical fiber cavity 15 is formed inside the inner tube 14. The optical fiber cavity 15 contains a bundle of multiple hollow and solid optical fibers 3. A first arc-shaped cavity 12 is formed between the inner tube 14 and the corresponding arc-shaped sheath wall 11. The connection point of the inner tube 14 to the clockwise side is connected by a connector 13. The connector 13 is arc-shaped and its radius is the same as that of the arc-shaped sheath wall 11. The connector 13 and the adjacent clockwise arc-shaped sheath wall 11 are located on the same circumference. The elastic skeleton 2 includes a skeleton center body and four elastic skeleton strips 21. A central reinforcing member 25 is provided in the skeleton center body. The four skeleton strips 21 are distributed around the skeleton center body. One end of the skeleton strip 21 is connected to the skeleton center body. The two adjacent skeleton strips 21 are at 90°. The skeleton strip 21 can be bent into an arc shape in a clockwise direction under force and form a second arc cavity 24. The other end of any skeleton strip 21 forms a connecting member receiving cavity 26 with the adjacent skeleton strip 21 on the clockwise side. Multiple elliptical fiber receiving slots 22 are evenly provided on the side wall of the skeleton strip 21 on the clockwise side. The fiber receiving slots 22 are connected to the second arc cavity 24 through a telescopic gap 23. The telescopic gap 23 and the major axis of the ellipse of the fiber receiving slot 22 are on the same straight line. Each of the four skeleton strips 21 is located in a corresponding first arc-shaped cavity 12, and the skeleton strips 21 are elastically attached to the inner wall of the corresponding arc-shaped sheath wall 11. The width of the first arc-shaped cavity 12 is greater than the width of the skeleton strips 21. The inner sleeve 14 is located in the second arc-shaped cavity 24. The inner sleeve 14 does not contact the corresponding skeleton strip 21. The connector 13 is located in the corresponding connector receiving cavity 26. The fiber optic slot 22 contains a bundle of multiple hollow and solid optical fibers 3. The diameters of both the hollow and solid optical fibers are larger than the width of the expansion gap 23. Preferably, the diameters of the hollow and solid optical fibers are more than twice the width of the expansion gap 23 to prevent the hollow and solid optical fibers from detaching from the expansion gap 23. When the skeleton strip 21 is not under stress, it is straight, and the inner wall of the fiber optic slot 22 is arc-shaped.

[0039] Example 2: Figures 5 to 8 An impact-resistant hybrid hollow and solid optical fiber cable includes a sheath layer 1 and an elastic skeleton 2, wherein the elastic skeleton 2 is located inside the sheath layer 1. The sheath layer 1 includes four identical arc-shaped sheath walls 11, which are connected end to end. The connection point of two adjacent arc-shaped sheath walls is recessed towards the center of the sheath layer 1. Each arc-shaped sheath wall 11 has a butterfly unit inside its arc. The butterfly unit consists of a butterfly unit sheath 16, two butterfly unit reinforcements 17, and a fiber bundle 3 composed of multiple hollow and solid optical fibers. The two butterfly unit reinforcements 17 and the fiber bundle 3 composed of multiple hollow and solid optical fibers are located within the butterfly unit sheath 16. Between the two butterfly-shaped unit reinforcement members 17, the line connecting the axes of the two butterfly-shaped unit reinforcement members 17 is the long axis of the butterfly-shaped unit. The sidewalls of the butterfly-shaped unit sheath 16 at both ends of the long axis of the butterfly-shaped unit are arc-shaped. A first arc-shaped cavity 12 is formed between one arc-shaped sidewall of the butterfly-shaped unit sheath 16 and the corresponding arc-shaped sheath wall 11. The connection point of the butterfly-shaped unit and the clockwise side is connected by a connector 13. The connector 13 is arc-shaped, and the radius of the connector 13 is the same as the radius of the arc-shaped sheath wall 11. The connector 13 and the adjacent clockwise side arc-shaped sheath wall 11 are located on the same circumference. The elastic skeleton 2 includes a skeleton center body and four elastic skeleton strips 21. A central reinforcing member 25 is provided in the skeleton center body. The four skeleton strips 21 are distributed around the skeleton center body. One end of the skeleton strip 21 is connected to the skeleton center body. The two adjacent skeleton strips 21 are at 90°. The skeleton strip 21 can be bent into an arc shape in a clockwise direction under force and form a second arc cavity 24. The other end of any skeleton strip 21 forms a connecting member receiving cavity 26 with the adjacent skeleton strip 21 on the clockwise side. Multiple elliptical fiber receiving slots 22 are evenly provided on the side wall of the skeleton strip 21 on the clockwise side. The fiber receiving slots 22 are connected to the second arc cavity 24 through a telescopic gap 23. The telescopic gap 23 and the major axis of the ellipse of the fiber receiving slot 22 are on the same straight line. Four skeleton strips 21 are located in a corresponding first arc-shaped cavity 12, and the skeleton strips 21 are elastically attached to the inner wall of the corresponding arc-shaped sheath wall 11. The width of the first arc-shaped cavity 12 is greater than the width of the skeleton strips 21. The butterfly unit is located in the second arc-shaped cavity 24. The butterfly unit is not in contact with the corresponding skeleton strip 21. The connector 13 is located in the corresponding connector receiving cavity 26. The fiber optic slot 22 contains a bundle of multiple hollow and solid optical fibers 3. The diameters of both the hollow and solid optical fibers are larger than the width of the expansion gap 23. Preferably, the diameters of the hollow and solid optical fibers are more than twice the width of the expansion gap 23 to prevent the hollow and solid optical fibers from detaching from the expansion gap 23. When the skeleton strip 21 is not under stress, it is straight, and the inner wall of the fiber optic slot 22 is arc-shaped.

[0040] Example 3: Reference Figures 1 to 4An optical cable with hollow optical fiber includes a sheath layer 1 and an elastic skeleton 2, wherein the elastic skeleton 2 is located inside the sheath layer 1. The sheath layer 1 includes four identical arc-shaped sheath walls 11, which are connected end to end, and the connection point of two adjacent arc-shaped sheath walls is recessed towards the center of the sheath layer 1. The elastic skeleton 2 includes a skeleton center body and four elastic skeleton strips 21. The four skeleton strips 21 are distributed around the skeleton center body. One end of the skeleton strip 21 is connected to the skeleton center body. The two adjacent skeleton strips 21 are at 90°. The skeleton strips 21 can be bent into an arc shape in a clockwise direction under force and form a second arc cavity 24. The sidewall of the skeleton strip 21 in the clockwise direction is uniformly provided with a plurality of elliptical fiber optic slots 22. The fiber optic slots 22 and the second arc cavity 24 are connected through a telescopic gap 23. The telescopic gap 23 and the major axis of the ellipse of the fiber optic slot 22 are on the same straight line. Furthermore, the skeleton strip 21 is elastic and fits tightly against the inner wall of the corresponding arc-shaped sheath wall 11; The fiber optic slot 22 contains a bundle of multiple hollow and solid optical fibers. The diameters of both the hollow and solid optical fibers are larger than the width of the expansion gap 23. Preferably, the diameters of the hollow and solid optical fibers are more than twice the width of the expansion gap 23 to prevent the hollow and solid optical fibers from detaching from the expansion gap 23. When the skeleton strip 21 is not under stress, it is straight, and the inner wall of the fiber optic slot 22 is arc-shaped.

[0041] In any of the above embodiments, the shock-resistant hollow and solid hybrid optical fiber cable can also have its expansion gap 23 closed.

[0042] The shock-resistant hybrid hollow and solid fiber optic cable described in any of the above embodiments has extremely high waterproof requirements for hollow fiber. After breakage, the air core is prone to water ingress, leading to failure. It also has weak tolerance to humidity and mechanical vibration. The gaps in the sheath layer 1 are filled with water-blocking gel, and the broken end face will be covered by water-blocking gel, effectively preventing water from entering the air core. In addition, the water-blocking gel can also have an anti-vibration effect.

[0043] In any of the above embodiments, the number of the arc-shaped sheath wall 11 and the skeleton strip 21 can be any number greater than or equal to 3, as long as the number of the arc-shaped sheath wall 11 and the skeleton strip 21 is the same.

[0044] The impact-resistant hollow and solid hybrid optical fiber cable described in any of the above embodiments has an elastic skeleton 2 made of TPU thermoplastic polyurethane.

[0045] Example 4: Figures 9 to 12 A method for preparing an impact-resistant hybrid hollow and solid optical fiber cable as described in Embodiment 3 includes the following steps: Step 01: Extrusion Figure 9 The elastic skeleton 2 includes a skeleton center body and four elastic skeleton strips 21. The skeleton center body is provided inside the skeleton center body, and the four skeleton strips 21 are distributed around the skeleton center body. One end of the skeleton strip 21 is connected to the skeleton center body. The two adjacent skeleton strips 21 are at 90° apart, and the skeleton strips 21 are straight strips. Step 02: Pass the elastic skeleton 2 from Step 01 through the shaping mold. The shaping mold includes a mold body 4, four hemming molds 6, four mandrels 9, and two mounting components 5. The mounting components 5 are fixed on the mold body 4 and are used to install the shaping mold. The mold body 4 is in the shape of a hollow frustum. The hemming mold 6 is fixed to the inner wall of the mold body 4. The diameter of the front opening of the hemming mold 6 is large, and the diameter of the rear opening is small. After unfolding, the hemming mold 6 is a 1 / 3 ring. The mandrel 9 is located in the corresponding hemming mold 6. The mandrel 9 is coaxial with the hemming mold 6. A third arc cavity 8 is formed between the mandrel 9 and the hemming mold 6. A central hole 10 is formed between the four mandrels 9. A side of the hemming mold 6 away from the central hole is connected and fixed to the mandrel 9 through a positioning connection component 11. An extension mold 7 is connected to the rear opening of the hemming mold 6. The cross-section of the extension mold 7 is the same as the cross-section of the rear opening of the hemming mold 6. The connection between the extension mold 7 and the rear opening of the hemming mold 6 is smooth. When the elastic skeleton 2 passes through the shaping mold, the elastic skeleton 2 enters from the front end of the crimping mold 6, the skeleton center body passes through the central hole 10, the skeleton strip 21 passes through the corresponding third arc cavity 8, the skeleton strip 21 gradually bends into an arc shape in the third arc cavity 8 until the two side walls of the expansion gap 23 are in contact. When the elastic skeleton 2 passes through the shaping mold, the fiber bundle 3, which is a mixture of hollow fiber and solid fiber, is simultaneously placed in the fiber optic cavity 22, and the fiber optic cavity 22 is filled with water-blocking gel. The extension mold 7 passes through the central cavity of the extrusion mold core of the sheath layer 1. When the sheath layer 1 is extruded, the skeleton strip 21 is directly located inside the corresponding arc-shaped sheath wall 11. After passing through the extension mold 7, the skeleton strip 21 automatically expands outward to form a telescopic gap 23. The skeleton strip 21 is attached to the corresponding arc-shaped sheath wall 11.

[0046] The extrusion mold for the sheath layer 1 in step 03 described above is existing technology.

[0047] The present invention has the following beneficial effects: 1. The skeleton strips 21 of the elastic skeleton 2 are bent to form multiple fiber optic slots 22. The multiple fiber optic slots 22 are formed in one step, which is convenient and quick.

[0048] 2. When taking the optical fiber from the optical fiber slot 22, simply break the corresponding arc-shaped sheath wall 11. Due to the internal stress of the skeleton strip 21, the skeleton strip 21 will automatically unfold, and the optical fiber can be taken out. Compared with the loose tube structure, taking out the optical fiber is more convenient.

[0049] 3. The skeleton bar 21 is elastic, which makes the optical cable more impact resistant.

[0050] 4. Setting the expansion gap 23 can not only further improve the impact resistance of the optical cable, but also allow the water-blocking gel to flow from the optical fiber cavity 22 into the second arc cavity 24 when the optical cable is squeezed and impacted, preventing the optical fiber cavity 22 from deforming after being squeezed and impacted, and preventing the optical fiber from being subjected to excessive local short-term impact pressure and thus breaking.

[0051] 5. The fiber optic slots 22 after the optical cable is cabled are elliptical, and the major axes of all the ellipses of the fiber optic slots 22 intersect at the center of the arc-shaped skeleton strip 21. Compared with the circular structure, the pressure resistance is better.

[0052] 6. The inner sleeve 14 or the butterfly unit is integrally formed with the sheath layer 1 through the connector 13, which improves production efficiency. The arc-shaped skeleton strip 21 also provides further protection for the inner sleeve 14 or the butterfly unit.

[0053] 7. When the elastic skeleton 2 passes through the shaping mold, the optical fiber is simultaneously placed into the optical fiber cavity 22 and filled with water-blocking gel. The water-blocking gel not only provides water-blocking effect, but also provides lubrication when the elastic skeleton 2 passes through the shaping mold.

[0054] 8. The fiber optic slot 22 of the skeleton bar has an inward opening, which provides better protection for the optical fiber compared to traditional skeleton-type optical cables.

[0055] The above embodiments are merely preferred technical solutions of the present invention and should not be considered as limitations on the present invention. The scope of protection of the present invention should be limited to the technical solutions described in the claims, including equivalent substitutions of the technical features described in the claims. That is, equivalent substitutions and improvements within this scope are also within the scope of protection of the present invention.

Claims

1. An impact-resistant hybrid hollow and solid optical fiber cable, comprising a sheath layer (1) and an elastic skeleton (2), wherein the elastic skeleton (2) is located inside the sheath layer (1); characterized in that The sheath layer (1) includes n identical arc-shaped sheath walls (11), n≥3, all arc-shaped sheath walls (11) are connected end to end, and the connection point of two adjacent arc-shaped sheath walls is recessed towards the center of the sheath layer (1); The elastic skeleton (2) includes a skeleton center body and n elastic skeleton strips (21). The n skeleton strips (21) are distributed at equal intervals around the skeleton center body. One end of the skeleton strip (21) is connected to the skeleton center body. The skeleton strip (21) can be bent into an arc shape in a clockwise direction under force and form a second arc cavity (24). The sidewall of the skeleton strip (21) on the clockwise side is uniformly provided with multiple elliptical opening optical fiber slots (22). The skeleton strip (21) is elastic and fits tightly against the inner wall of the corresponding arc-shaped sheath wall (11); The fiber optic slot (22) contains a bundle (3) of multiple hollow and solid optical fibers, and the solid optical fibers are of the specifications of G.652D, G.654E or G.655 optical fibers. The gaps in the sheath layer (1) are filled with water-resistant gel.

2. The hybrid solid and hollow fiber optical cable according to claim 1, wherein, The fiber optic slot (22) is connected to the second arc cavity (24) through the expansion gap (23), and the diameters of both the hollow fiber and the solid fiber are greater than the width of the expansion gap (23).

3. The hybrid solid and hollow fiber optical cable of claim 2, wherein, Each second arc cavity (24) contains an optical unit, which contains a bundle of multiple hollow and solid optical fibers (3). The optical unit is connected to the connection point on the clockwise side by a connector (13).

4. The hybrid air- and solid-cored fiber optic cable of claim 3, wherein, The connector (13) is arc-shaped, and the radius of the connector (13) is the same as the radius of the arc-shaped sheath wall (11). The connector (13) and the adjacent clockwise side arc-shaped sheath wall (11) are located on the same circumference.

5. The hybrid solid and hollow fiber optical cable of claim 4, wherein, A connector receiving cavity (26) is formed between the other end of any skeleton strip (21) and the adjacent clockwise skeleton strip (21).

6. The impact-resistant hybrid hollow and solid optical fiber cable according to claim 5, characterized in that, The optical unit is an inner sleeve (14), and an optical fiber cavity (15) is formed inside the inner sleeve (14). The optical fiber bundle (3) consisting of a mixture of hollow and solid optical fibers is located inside the optical fiber cavity (15). A first arc-shaped cavity (12) is formed between the inner sleeve (14) and the corresponding arc-shaped sheath wall (11). The skeleton strip (21) is located in the corresponding first arc-shaped cavity (12). The width of the first arc-shaped cavity (12) is greater than the width of the skeleton strip (21). The inner sleeve (14) does not contact the corresponding skeleton strip (21). The connector (13) is located in the corresponding connector receiving cavity (26).

7. The impact-resistant hybrid hollow and solid optical fiber cable according to claim 5, characterized in that, The optical unit is a butterfly unit, which consists of a butterfly unit sheath (16), two butterfly unit reinforcement members (17), and a fiber bundle (3) composed of hollow and solid optical fibers. The two butterfly unit reinforcement members (17) and the fiber bundle (3) are located inside the butterfly unit sheath (16), and the fiber bundle (3) is located between the two butterfly unit reinforcement members (17). The line connecting the axes is the long axis of the butterfly unit. The sidewalls of the butterfly unit sheath (16) at both ends of the long axis of the butterfly unit are arc-shaped. A first arc-shaped cavity (12) is formed between one arc-shaped sidewall of the butterfly unit sheath (16) and the corresponding arc-shaped sheath wall (11). The skeleton strip (21) is located in the corresponding first arc-shaped cavity (12). The butterfly unit position does not contact the corresponding skeleton strip (21). The connector (13) is located in the corresponding connector receiving cavity (26).

8. An impact resistant hybrid solid and hollow fiber optical cable according to claim 6 or claim 7, wherein, The major axis of the ellipse of the expansion gap (23) and the fiber optic slot (22) is on the same straight line.

9. The hybrid air- and solid-core fiber optical cable of claim 8, wherein, A central reinforcing member (25) is provided inside the core of the skeleton.

10. A method of manufacturing the impact resistant hybrid hollow and solid core fiber optic cable of claim 1, wherein, Includes the following steps: Step 01: Extruded elastic skeleton (2), the elastic skeleton (2) includes a skeleton center body and n elastic skeleton strips (21), n≥3, a skeleton center body is provided in the skeleton center body, all skeleton strips (21) are distributed at equal intervals around the skeleton center body, one end of the skeleton strip (21) is connected to the skeleton center body, and the skeleton strips (21) are straight strips. Step 02: Pass the elastic skeleton (2) from Step 01 through the shaping mold. The shaping mold includes a mold body (4), n edge-rolling molds (6), n mandrels (9), and two mounting components (5). The mounting components (5) are fixed to the mold body (4). The mold body (4) is in the shape of a hollow frustum. The edge-rolling molds (6) are fixed to the inner wall of the mold body (4). The diameter of the front opening of the edge-rolling mold (6) is large, and the diameter of the rear opening is small. After unfolding, the edge-rolling mold (6) forms a 1 / 3 ring. The mandrels (9) are located inside the corresponding edge-rolling molds (6). The mandrel (9) is coaxial with the crimping die (6), and a third arc-shaped cavity (8) is formed between the mandrel (9) and the crimping die (6). A central hole (10) is formed between the n mandrels (9). A side of the crimping die (6) away from the central hole is connected and fixed to the mandrel (9) through a positioning connection component (11). An extension die (7) is connected to the rear opening of the crimping die (6). The cross-section of the extension die (7) is the same as the cross-section of the rear opening of the crimping die (6). The connection between the extension die (7) and the rear opening of the crimping die (6) is smooth. When the elastic skeleton (2) passes through the shaping mold, the elastic skeleton (2) enters from the front end of the crimping mold (6), the skeleton center body passes through the central hole (10), the skeleton strip (21) passes through the corresponding third arc cavity (8), the skeleton strip (21) gradually bends into an arc shape in the third arc cavity (8) until the two side walls of the expansion gap (23) are in contact. When the elastic skeleton (2) passes through the shaping mold, the fiber bundle (3) of hollow fiber and solid fiber mixed is simultaneously placed in the fiber optic cavity (22), and the fiber optic cavity (22) is filled with water-blocking gel. The extension mold (7) passes through the central cavity of the core of the extrusion mold of the sheath layer (1). When the sheath layer (1) is extruded, the skeleton strip (21) is directly located in the corresponding arc-shaped sheath wall (11). After passing through the extension mold (7), the skeleton strip (21) automatically expands outward to form a telescoping gap (23). The skeleton strip (21) is attached to the corresponding arc-shaped sheath wall (11).

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