Loose tube hybrid optical fiber ribbon cable and method of manufacturing the same

Abstract

The application belongs to the field of optical cables, and discloses a loose tube embedded optical fiber ribbon cable, which has a central reinforcing member (1), a loose tube (4) and an outer sheath (6). The cable is characterized in that it further has an embedded component (5) which is composed of an embedded body (52), a first embedded end (51) and a second embedded end (53). The loose tube (4) has a tube body (41) with a groove (410) on the outer edge of the tube body. The inner part of the loose tube has a tube cavity (40) with an optical fiber ribbon in the tube cavity. The first embedded end and the second embedded end are embedded in the groove of each loose tube. The outer edges of the embedded bodies of all the embedded components are on the same cylindrical surface. The outer sheath (6) is wrapped outside the embedded component (5). The application further discloses a manufacturing method. The application has the following main beneficial technical effects: simple structure, easy manufacturing, stable structure, more stable and reliable temperature performance, and no phenomenon of damaging the loose tube by the yarn.

Description

TECHNICAL FIELD

[0001] The present application belongs to the field of optical cable, in particular discloses a loose tube embedded type optical fiber ribbon cable and a manufacturing method thereof. BACKGROUND

[0002] The Chinese communication industry standards YD / T 981 and YD / T 901 recommend several typical layer-stranded ribbon optical cables and layer-stranded optical cables. They are composed of a central strength member, a loose tube, a protective layer, and an outer sheath tube. The loose tube is generally wrapped with polyester yarn, which can stabilize the cable core and the structure of the product. Under the conditions of production winding, construction unwinding, inspection, construction, repeated bending, twisting, impact, etc., the cable core structure can still remain stable, and the performance of the optical fiber in it is stable. However, the use of polyester yarn has the following defects: due to the large difference between the thermal shrinkage and expansion of polyester yarn and the material of the loose tube, when the temperature changes, the polyester yarn often causes the loose tube to be damaged, and in severe cases, the optical fiber is cracked and stressed; the transmission performance of the optical fiber changes, mainly manifested as an increase in optical transmission attenuation, affecting normal communication. On the other hand, the wrapped polyester yarn requires wrapping equipment, which occupies a large space, has high noise, high equipment investment cost, and is easy to damage, thus increasing the cost.

[0003] CN115291349A discloses a no-yarn optical cable and a preparation method thereof, which includes a reinforcing core, at least one optical unit and at least one filling rope arranged circumferentially along the reinforcing core; the optical unit and the filling rope are twisted and arranged on the outer periphery of the reinforcing core in an SZ twisting manner; a solidified glue layer is spaced and wrapped at the radial section of the reinforcing core, the optical unit and the filling rope to form a water-blocking section in the radial direction of the no-yarn optical cable; and an outer sheath is wrapped on the outer periphery of the solidified glue layer to protect the internal optical unit, filling rope and solidified glue layer. Although the use of glue filling makes the cable core integrated, it is inconvenient to open and peel, the solidified glue affects the original performance of the loose tube, and the temperature adaptability is poor.

[0004] CN110333585A discloses a no-yarn layer-stranded optical cable and a manufacturing method thereof, which includes a central strength member, at least one first water-blocking yarn, a cable core, a water-blocking element, and an outer sheath, the first water-blocking yarn is wrapped on the outer surface of the central strength member; the cable core is arranged on the outer surface of the central strength member, the cable core includes m loose tubes and n filling ropes twisted in an SZ manner, wherein m≥1 and n≥0, the loose tube contains 1-48 optical fibers; the outer sheath is arranged on the outer side of the cable core; the water-blocking element is arranged between the cable core and the outer sheath; the structure is actually a well-known structure, and the cable core structure is unstable.

[0005] CN113534382A discloses a layer-stranded optical cable with pressure-resistant loose tube, having an outer sheath, a tape layer, at least three loose tubes and a central reinforcing member, at least one optical communication component is arranged in the loose tube, characterized in that the loose tube is a loose tube combination, the loose tube combination is composed of an outer sleeve and an inner sleeve, the outer sleeve is composed of an outer sleeve body, at least three pairs of pressure-resistant clamping teeth are arranged on the inner wall of the outer sleeve body, the inner sleeve is composed of an inner sleeve body and a clamping plate, the clamping plate is arranged on the outer wall of the inner sleeve body and is engaged with the pressure-resistant clamping teeth, the optical communication component is arranged in the cavity of the inner sleeve body, and the inner sleeve body is clamped to realize pressure resistance. SUMMARY

[0006] To solve the above problems, the purpose of the present application is to disclose a loose tube embedded optical fiber ribbon cable and its manufacturing method, which is realized by the following technical scheme.

[0007] A loose tube embedded optical fiber ribbon cable has a central reinforcing member, a plurality of loose tubes and an outer sheath, and the plurality of loose tubes are located outside the central reinforcing member; characterized in that: it also has a plurality of embedded components, the embedded component is composed of an embedded body, a first embedded end and a second embedded end located at both ends of the embedded body, the outer edge of the embedded body is part of a cylindrical surface, and the first embedded end and the second embedded end both extend to the axis direction of the cylinder where the outer edge of the embedded body is located; the loose tube is composed of a sleeve body, the outer edge of the sleeve body has a groove, the inside of the loose tube has a sleeve cavity extending in the axial direction, the sleeve cavity has at least one optical fiber ribbon, the optical fiber ribbon is composed of a plurality of optical fibers and a bonding layer that entirely covers the plurality of optical fibers, the groove on the loose tube faces the outer sheath, the first embedded end of one embedded component and the second embedded end of another embedded component are embedded in the groove of each loose tube, the first embedded end and the second embedded end in the groove of each loose tube are in close contact with the inner wall of the groove of the loose tube, the outer edges of the embedded bodies of all embedded components are on the same cylindrical surface, and the outer sheath covers the embedded components.

[0008] The manufacturing method of the above-mentioned loose tube embedded optical fiber ribbon cable is characterized in that:

[0009] First step: optical fiber coloring, different colored optical fibers are coated on the outer layer of the optical fiber to realize two-by-two division;

[0010] Second step: ribbonizing, a plurality of optical fibers are placed in parallel, and a bonding coating is applied to the outside to form an optical fiber ribbon;

[0011] Third step: forming a loose tube, a plastic tube is extruded through an extrusion mold, and an optical fiber ribbon is inserted into the plastic tube, and then pulled and cooled to form a loose tube;

[0012] Fourth step: manufacturing embedded components, continuous embedded components are formed by extrusion;

[0013] Fifth step: manufacturing the cable core, taking the central reinforcing member through the central hole of the cabling machine, taking the plurality of loose tubes formed in the third step through the surrounding holes of the cabling machine, and making the grooves of the loose tubes away from the central hole and facing outward, making the symmetry axis plane of the grooves pass through the axis of the central hole, taking the fitting members manufactured in the fourth step, making the first fitting end of one fitting member and the second fitting end of another fitting member embedded in the grooves of each loose tube, making the first fitting end and the second fitting end in the grooves of each loose tube close to each other and to the inner wall of the groove of the loose tube, and taking the central reinforcing member, the loose tubes and all the fitting members together through the cylindrical forming hole and properly heating to make the first fitting end and the second fitting end bonded in the grooves, forming the cable core with a cylindrical surface;

[0014] Sixth step: manufacturing the finished product, taking the cable core through the mold core hole of the sheath extruding machine, extruding plastic and covering the cable core outside to form the outer sheath, and completing the manufacturing of the loose-tube fitting type optical fiber ribbon cable with fitting members.

[0015] A loose-tube fitting type optical fiber ribbon cable has a central reinforcing member, an even number of loose tubes and an outer sheath, and all the loose tubes are located outside the central reinforcing member; characterized in that it further has a plurality of fitting members, each fitting member is composed of a fitting body, a first fitting end and a second fitting end located at two ends of the fitting body, and a third fitting end located between the first fitting end and the second fitting end, the outer edge of the fitting body is a part of a cylindrical surface, and the first fitting end, the second fitting end and the third fitting end all extend toward the axis of the cylinder where the outer edge of the fitting body is located; each loose tube is composed of a tube body, and the outer edge of the tube body has a groove, and the inside of the loose tube has a tube cavity extending in the axial direction, and the tube cavity has at least one optical fiber ribbon, and each optical fiber ribbon is composed of a plurality of optical fibers and a bonding layer covering the plurality of optical fibers as a whole; the groove of each loose tube faces the outer sheath, and in the three adjacent loose tubes: the third fitting end is embedded in the groove of the middle loose tube, the third fitting end is close to the inner wall of the groove of the middle loose tube, and the first fitting end of one fitting member and the second fitting end of another fitting member are respectively embedded in the grooves of the two end loose tubes, and the first fitting end and the second fitting end in the grooves of the two end loose tubes are close to each other and to the inner wall of the groove of the loose tube; the outer edges of the fitting bodies of all the fitting members are on the same cylindrical surface, and the outer sheath covers the fitting members.

[0016] The loose-tube fitting type optical fiber ribbon cable described above is characterized in that the groove of each loose tube has a protruding strip extending upward from the bottom of the groove, and the protruding strip and the tube body are in an integral structure, and the first fitting end and the second fitting end in the groove of each loose tube are separated by the protruding strip.

[0017] The loose tube embedded optical fiber ribbon cable is characterized in that the embedded parts are spaced along the axial direction of the cable.

[0018] The loose tube embedded optical fiber ribbon cable is characterized in that the embedded parts are spaced along the axial direction of the cable.

[0019] The first step is to color the optical fibers, and the outer layer of the optical fibers is coated and cured with different colors of optical fibers to achieve two-by-two differentiation.

[0020] The second step is to ribbonize, and a plurality of optical fibers are placed in parallel and are integrally coated with adhesive coating on the outside to form an optical fiber ribbon.

[0021] The third step is to form a loose tube, and a plastic tube is extruded through an extrusion mold and the optical fiber ribbon is inserted into the plastic tube, and the loose tube is formed by traction and cooling.

[0022] The fourth step is to manufacture the embedded parts, and continuous embedded parts are formed by extrusion and are cut into short embedded parts.

[0023] The fifth step is to manufacture the cable core, the central reinforcing member is passed through the central hole of the cabling machine, a plurality of loose tubes formed in the third step are passed through the surrounding holes of the cabling machine, the grooves of the loose tubes are away from the central hole and face outward, the symmetry axis plane of the grooves passes through the axis of the central hole, the short embedded parts manufactured in the fourth step are taken, the first embedded end of each embedded part and the second embedded end of another embedded part are embedded in the groove of each loose tube, the first embedded end and the second embedded end in the groove of each loose tube are in close contact with the inner wall of the groove of the loose tube, the embedded parts are embedded in segments, the embedded parts are spaced along the axial direction of the central reinforcing member, the central reinforcing member, the loose tubes and all the embedded parts are pulled through the cylindrical forming hole, and the first embedded end and the second embedded end are bonded in the groove by appropriate heating to form a cable core with a cylindrical surface.

[0024] The sixth step is to manufacture the finished product, the cable core is passed through the mold core hole of the sheath extrusion machine, plastic is extruded and coated outside the cable core to form an outer sheath, and the manufacturing of the layer-twisted ribbon optical cable with embedded parts is completed.

[0025] The loose tube embedded optical fiber ribbon cable is characterized in that the embedded parts are spaced along the axial direction of the cable.

[0026] The loose tube embedded optical fiber ribbon cable is characterized in that the embedded parts are spaced along the axial direction of the cable.

[0027] First step: coloring the optical fiber, coating the outer layer of the optical fiber with different colors to distinguish each other;

[0028] Second step: ribbonizing, placing multiple optical fibers in parallel and coating the outside with adhesive to form an optical fiber ribbon;

[0029] Third step: forming loose tube, extruding plastic tube through the extrusion mold and inserting the optical fiber ribbon into the plastic tube, pulling and cooling to form the loose tube;

[0030] Fourth step: manufacturing the fitting part, forming a continuous fitting part by extrusion and cutting it into short segments;

[0031] Fifth step: manufacturing the cable core, taking the central strength member through the central hole of the cabling machine, taking multiple loose tubes formed in the third step through the surrounding holes of the cabling machine, making the grooves of the loose tubes away from the central hole and facing outward, making the symmetric axis plane of the grooves pass through the axis of the central hole, taking the short segments of the fitting part manufactured in the fourth step, inserting the first fitting end of one fitting part and the second fitting end of another fitting part into the groove of each loose tube, making the first fitting end and the second fitting end in the groove of each loose tube tightly close to each other and the inner wall of the groove, and inserting the fitting part segment by segment, making the fitting part distributed along the axis of the central strength member, pulling the central strength member, the loose tube and all the fitting parts through the cylindrical forming hole together and heating appropriately to make the first fitting end and the second fitting end adhere to the groove, forming a cable core with a cylindrical surface; the segment-by-segment insertion of the fitting part is achieved by pressing along the axis of the central strength member or by pressing the fitting part from the outside; using time control, the fitting parts between adjacent loose tubes are sent at different times, that is, the adjacent fitting parts are staggered in space;

[0032] Sixth step: manufacturing the finished product, taking the cable core through the mold core hole of the jacket extruder, extruding plastic and coating the outside of the cable core to form an outer jacket, completing the manufacturing of the layer-stranded ribbon optical cable with fitting parts.

[0033] A loose-tube spliced ​​fiber optic cable comprises a central reinforcing member, multiple loose tubes, and an outer sheath, with the multiple loose tubes located outside the central reinforcing member. The loose tubes are characterized by: a one-piece structure comprising a tube body, a ridge, a splicing component, and at least one fiber ribbon; a groove on the outer wall of the tube body, with the ridge located within the groove and its bottom integrated with the tube body, dividing the groove into two parts; an axially extending tube cavity inside the loose tube, with at least one fiber ribbon located within the tube cavity; each fiber ribbon comprising multiple optical fibers and an adhesive layer that completely covers the multiple optical fibers; and a splicing component comprising a splicing body and splices located at both ends of the splicing body. The first fitting end and the second fitting end are formed. The outer edge of the fitting body is part of a cylindrical surface. Both the first fitting end and the second fitting end extend towards the axis of the cylinder where the outer edge of the fitting body is located. The first fitting end is located in the groove and is integrated with the sleeve body. The first fitting end is located below the convex strip. The groove on the loose sleeve faces the outer sheath. The second fitting end of another fitting component is embedded in the groove of each loose sleeve. The second fitting end in the groove of each loose sleeve is in close contact with the inner wall of the groove of the loose sleeve. The outer edges of the fitting bodies of all fitting components are on the same cylindrical surface. The outer sheath covers the fitting components.

[0034] This application has the following main beneficial technical effects: simple structure, easy to manufacture, more stable and reliable temperature performance; and will not cause the phenomenon of yarn tangling and damage to the loose sleeve. Attached Figure Description

[0035] Figure 1 This is a schematic diagram of a three-dimensional structure after dissection, as shown in Example 1.

[0036] Figure 2 for Figure 1 Enlarged cross-sectional structural diagram.

[0037] Figure 3 for Figure 1 A schematic diagram of the cross-sectional structure of the loose sleeve used.

[0038] Figure 4 for Figure 2 A magnified diagram of a portion of the image.

[0039] Figure 5 This is a schematic diagram of the cross-sectional structure of another fitting component used in Implementation Example 1.

[0040] Figure 6 This is a schematic diagram of a dissected three-dimensional structure for Example 2.

[0041] Figure 7 for Figure 6 Enlarged cross-sectional structural diagram.

[0042] Figure 8 Fig. 1 is a schematic view of a cross-sectional structure of a conventional optical fiber cable. Figure 6 Fig. 2 is a schematic view of a cross-sectional structure of a conventional optical fiber cable.

[0043] Figure 9 Fig. 3 is a schematic view of a cross-sectional structure of a conventional optical fiber cable. Figure 6 Fig. 4 is a schematic view of a cross-sectional structure of a conventional optical fiber cable.

[0044] Figure 10 Fig. 5 is a schematic view of a cross-sectional structure of a conventional optical fiber cable.

[0045] Figure 11 Fig. 6 is a schematic view of a cross-sectional structure of a conventional optical fiber cable.

[0046] Figure 12 Fig. 7 is a schematic view of a cross-sectional structure of a conventional optical fiber cable.

[0047] For a better understanding of the present application and to provide further information with regard to the prior art, the drawings will be described in detail below.

[0048] In the drawings: 1 - central strength member, 2 - optical fiber, 3 - adhesive layer, 4 - loose tube, 5 - fitting member, 6 - outer sheath, 40 - tube cavity, 41 - tube body, 42 - protrusion, 410 - recess, 51 - first fitting end, 52 - fitting body, 53 - second fitting end, 54 - third fitting end. DETAILED DESCRIPTION

[0049] Embodiment 1

[0050] See Figures 1 to 5A loose tube embedded type fiber optic cable, having a central strength member 1, a plurality of loose tubes 4, an outer jacket 6, the plurality of loose tubes 4 being located outside the central strength member 1; characterized in that: further having a plurality of embedded components 5, the embedded component 5 being composed of an embedded body 52, a first embedded end 51 and a second embedded end 53 located at both ends of the embedded body 52, the outer edge of the embedded body 52 being a part of a cylindrical surface, the first embedded end 51 and the second embedded end 53 both extending towards the axis direction of the cylinder where the outer edge of the embedded body 52 is located; the loose tube 4 being composed of a tube body 41, the outer edge of the tube body 41 having a groove 410, the inside of the loose tube 4 having a tube cavity 40 extending in the axial direction, the tube cavity 40 having at least one optical fiber ribbon inside, the optical fiber ribbon being composed of a plurality of optical fibers 2 and a bonding layer 3 covering the plurality of optical fibers 2 as a whole; the groove 410 on the loose tube 4 facing the outer jacket 6, the first embedded end 51 of one embedded component 5 and the second embedded end 53 of another embedded component 5 being embedded in the groove 410 of each loose tube, the first embedded end 51 and the second embedded end 53 in the groove 410 of each loose tube being in close contact with the inner wall of the groove 410 of the loose tube, the outer edges of the embedded bodies 52 of all the embedded components 5 being on the same cylindrical surface, the outer jacket 6 being covered outside the embedded components 5.

[0051] The loose tube embedded type fiber optic cable described above, characterized in that the manufacturing method is:

[0052] First step: optical fiber coloring, coloring the outer layer of the optical fiber with different colors to achieve two-by-two differentiation;

[0053] Second step: ribbonizing, placing a plurality of optical fibers in parallel and covering the outside as a whole with bonding paint to form an optical fiber ribbon;

[0054] Third step: forming loose tubes, extruding plastic tubes through an extrusion mold and inserting optical fiber ribbons inside the plastic tubes to pull and cool to form loose tubes;

[0055] Fourth step: manufacturing embedded components, forming continuous embedded components through extrusion;

[0056] Fifth step: manufacturing a cable core, taking a central strength member through the central hole of a cabling machine, taking a plurality of loose tubes formed in the third step through the surrounding holes of the cabling machine, and making the grooves of the loose tubes face away from the central hole and face outward, making the symmetry axis plane of the grooves pass through the axis of the central hole, taking the embedded components manufactured in the fourth step, embedding the first embedded end of one embedded component and the second embedded end of another embedded component in the groove of each loose tube, making the first embedded end and the second embedded end in the groove of each loose tube be in close contact with the inner wall of the groove of the loose tube, while pulling the central strength member, the loose tubes, and all the embedded components through the cylindrical forming hole together and appropriately heating to bond the first embedded end and the second embedded end in the groove, forming a cable core with a cylindrical surface.

[0057] Step 6: Manufacture the product, pass the cable core through the mold core hole of the sheath extruder, extrude the plastic and coat the cable core to form an outer sheath, and complete the manufacture of the layer-stranded ribbon optical cable with the embedded components.

[0058] See Figure 5 As an improvement of the above embodiment, the embedded component 5 is composed of an embedded body 52, a first embedded end 51 and a second embedded end 53 located at both ends of the embedded body 52, and a third embedded end 54 located between the first embedded end 51 and the second embedded end 53. The outer edge of the embedded body 52 is part of a cylindrical surface, and the first embedded end 51, the second embedded end 53, and the third embedded end 54 all extend towards the axis of the cylinder where the outer edge of the embedded body 52 is located. This structure is suitable for an optical cable with an even number of loose tubes 4. In the three adjacent loose tubes, the third embedded end 54 is embedded in the groove 410 of the middle loose tube, the third embedded end 54 is in close contact with the inner wall of the groove 410 of the middle loose tube, and the first embedded end 51 of one embedded component 5 and the second embedded end 53 of another embedded component 5 are respectively embedded in the grooves 410 of the two end loose tubes. The first embedded end 51 and the second embedded end 53 in the grooves 410 of the two end loose tubes are in close contact with each other and with the inner wall of the groove 410 of the loose tube. The outer edges of the embedded bodies 52 of all embedded components 5 are on the same cylindrical surface, and the outer sheath 6 is coated outside the embedded components 5. The width of the third embedded end 54 is greater than the width of the first embedded end 51 and the width of the second embedded end 53.

[0059] Embodiment Example 2

[0060] See Figures 6 to 9 and refer to Figures 1 to 5 A loose-tube embedded optical fiber ribbon cable, which is basically the same as Embodiment Example 1, except that the groove 410 of the loose tube has a protrusion 42 extending upward from the bottom of the groove 410, and the protrusion 42 is in a one-piece structure with the tube body 41. The first embedded end 51 and the second embedded end 53 in the groove 410 of each loose tube are separated by the protrusion 42.

[0061] Embodiment Example 3

[0062] See Figure 10 and refer to Figures 1 to 9 A loose-tube embedded optical fiber ribbon cable, which is basically the same as Embodiment Example 2, except that the embedded components 5 are spaced along the axial direction of the optical cable.

[0063] The embedded components 5 in Embodiment Examples 1 and 2 are continuously distributed along the axial direction of the optical cable.

[0064] The loose-tube embedded optical fiber ribbon cable described above is characterized by a manufacturing method comprising:

[0065] First step: color the optical fiber, coat the outer layer of the optical fiber with different colors to distinguish each other;

[0066] Second step: ribbon, place multiple optical fibers in parallel and coat the outside with adhesive to form an optical fiber ribbon;

[0067] Third step: form the loose tube, extrude the plastic tube through the extrusion mold and insert the optical fiber ribbon into the plastic tube, pull and cool to form the loose tube;

[0068] Fourth step: make the fitting part, form a continuous fitting part by extrusion, and cut it into short sections;

[0069] Fifth step: make the cable core, take the central reinforcing member through the central hole of the cabling machine, take multiple loose tubes formed in the third step through the surrounding holes of the cabling machine, and make the grooves of the loose tubes face outward away from the central hole, with the axis of symmetry of the grooves passing through the axis of the central hole. Take the short fitting parts made in the fourth step, and insert one first fitting end of a fitting part and one second fitting end of another fitting part into the groove of each loose tube, so that the first fitting end and the second fitting end in the groove of each loose tube are tightly attached to the inner wall of the groove of the loose tube. Insert the fitting parts section by section, so that the fitting parts are distributed along the axis of the central reinforcing member, and then pull the central reinforcing member, the loose tubes, and all the fitting parts through the cylindrical forming hole and heat them appropriately to bond the first fitting end and the second fitting end in the groove, forming a cable core with a cylindrical surface.

[0070] Sixth step: make the finished product, take the cable core through the mold core hole of the jacket extruder, extrude plastic and coat the outside of the cable core to form an outer jacket, completing the manufacture of the layer-stranded ribbon optical cable with fitting parts.

[0071] The above-mentioned external pressure interval insertion of the fitting part is similar to the structure of a stapler staple, which is only one embodiment, and those skilled in the art can implement it as long as the fitting part can be inserted and damaged the loose tube.

[0072] Implementation Example 4

[0073] See Figure 11 and refer to Figures 1 to 10 A loose tube fitting type optical fiber ribbon cable, basically the same as implementation example 2, the difference is that the fitting parts 5 are distributed along the axis of the cable, clockwise or counterclockwise, and adjacent fitting parts 5 are staggered in space.

[0074] The loose tube hybrid optical fiber ribbon cable is characterized by a manufacturing method as follows:

[0075] Step 1: Color the optical fibers, coat and cure the optical fibers with different colors on the outer layer to distinguish each other;

[0076] Step 2: Ribbonize, place the multiple optical fibers in parallel and coat the whole outside with adhesive to form an optical fiber ribbon;

[0077] Step 3: Form the loose tube, extrude the plastic tube through the extrusion mold and pass the optical fiber ribbon into the plastic tube, pull and cool to form the loose tube;

[0078] Step 4: Manufacture the hybrid component, form the continuous hybrid component through extrusion and cut to form the short hybrid components;

[0079] Step 5: Manufacture the cable core, pass the central strength member through the central hole of the cabling machine, pass the multiple loose tubes formed in Step 3 through the surrounding holes of the cabling machine, make the grooves of the loose tubes away from the central hole and face outward, make the symmetric axis plane of the grooves pass the axis of the central hole, take the short hybrid components manufactured in Step 4, make the first hybrid end of one hybrid component and the second hybrid end of another hybrid component embedded in the groove of each loose tube, make the first hybrid end and the second hybrid end in the groove of each loose tube closely adhere to the inner wall of the groove of the loose tube, and embed the hybrid components in segments, make the hybrid components distributed along the axis of the central strength member, pull the central strength member, the loose tubes and all the hybrid components through the cylindrical forming hole together, and properly heat to make the first hybrid end and the second hybrid end adhere in the groove, form the cable core with the cylindrical surface; embed the hybrid components in segments by pressing along the axis of the central strength member, or press the hybrid components from the outside in intervals; adopt time sequence control to make the hybrid components between the adjacent loose tubes sent in staggered time, so that the adjacent hybrid components are staggered in space;

[0080] Step 6: Manufacture the finished product, pass the cable core through the mold core hole of the sheath extrusion machine, extrude the plastic and coat the outside of the cable core to form the outer sheath, complete the manufacturing of the layer-stranded ribbon optical fiber cable with the hybrid components.

[0081] Embodiment 5

[0082] See Figure 12 and refer to Figures 1 to 11A loose tube embedded type optical fiber ribbon cable as shown in the embodiment 2, the difference is that the loose tube 4 is an integrated structure, the loose tube 4 is composed of a tube body 41, a protrusion 42, an embedded component, and at least one optical fiber ribbon, the tube body 41 has a groove 410 on the outer wall, the protrusion 42 is located in the groove 410, the bottom of the protrusion 42 is integrated with the tube body 41, the protrusion 42 divides the groove 410 into two parts, the inside of the loose tube 4 has a tube cavity 40 extending in the axial direction, at least one optical fiber ribbon is located in the tube cavity 40, each optical fiber ribbon is composed of a plurality of optical fibers 2 and a bonding layer 3 that entirely covers the plurality of optical fibers 2, the embedded component is composed of an embedded body 52, a first embedded end 51 and a second embedded end 53 located at both ends of the embedded body 52, the outer edge of the embedded body 52 is part of a cylindrical surface, the first embedded end 51 and the second embedded end 53 both extend towards the axis of the cylinder where the outer edge of the embedded body 52 is located, the first embedded end 51 is located in the groove 410 and is integrated with the tube body 41, and the first embedded end 51 is located below the protrusion 42; the groove 410 on the loose tube 4 faces the outer sheath 6, and the second embedded end 53 of another embedded component is embedded in the groove 410 of each loose tube, and the second embedded end 53 is located above the protrusion 42; the second embedded end 53 in the groove 410 of each loose tube is tightly attached to the inner wall of the groove 410 of the loose tube, the outer edges of the embedded bodies 52 of all embedded components are on the same cylindrical surface, and the outer sheath 6 covers the embedded component 5. In this embodiment, the process of storing the embedded component is simplified.

[0083] The loose tube embedded type optical fiber ribbon cable as shown in the application, the feature is that part of the loose tube can be replaced by a solid or hollow filling rope, but at least one loose tube, when hollow, the filling rope has the same structure as the loose tube, except that the filling rope does not have an optical fiber ribbon inside; when solid, the difference between the filling rope and the loose tube is that the filling rope does not have an optical fiber ribbon inside and does not have a tube cavity.

[0084] The loose tube embedded type optical fiber ribbon cable as shown in the application, the feature is that the loose tube has different colors and can be distinguished in pairs; or, when there are three or more loose tubes, at least two colors are provided, and the colors are combined to achieve the distinction, for example, there are six loose tubes in total, one red, one green, and four white, the red and green are together, and the other white is together, in this way, when facing one end, the clockwise direction is red green white white white, and when facing the other end clockwise, it is green red white white white, in this way, the combination of color and sequence position can achieve the distinction of each loose tube.

[0085] The application, Figure 5 The other embedded component as shown in the application can also be used in the embodiments 2 to 4.

[0086] By analogy, in the present application, Figure 3 The loose tube and the fitting component without the third fitting end in Embodiment 1 are also suitable for use in other embodiments.

[0087] By analogy, the fitting components in Embodiments 3 and 4 are also suitable for use in other embodiments.

[0088] The gap inside the loose tube of the present application can also be filled with water-blocking materials such as water-blocking paste, water-blocking yarn, water-blocking powder, etc.

[0089] The gap between the cable cores in the present application can also be filled with cable core water-blocking materials such as cable paste, water-blocking yarn, water-blocking powder, etc.

[0090] The loose tube fitting optical fiber ribbon cable described in the present application is characterized in that the material of the central strength member 1 is steel wire or aluminum wire or iron wire or copper wire or glass fiber reinforced plastic rod.

[0091] The loose tube fitting optical fiber ribbon cable described in the present application is characterized in that the model of the optical fiber 2 is 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 or A1e.

[0092] The loose tube fitting optical fiber ribbon cable described in the present application is characterized in that the material of the loose tube 4 is modified polypropylene or polybutylene terephthalate.

[0093] The loose tube fitting optical fiber ribbon cable described in the present application is characterized in that the material of the protrusions is the same as that of the loose tube.

[0094] The loose tube fitting optical fiber ribbon cable described in the present application is characterized in that the fitting component 5 is of a one-piece structure.

[0095] The loose tube fitting optical fiber ribbon cable described in the present application is characterized in that the material of the fitting component 5 is plastic or a substance with high elasticity.

[0096] The substance with high elasticity described above is, for example, a rubber strip, etc.

[0097] The loose tube fitting optical fiber ribbon cable described above is characterized in that the material of the fitting component 5 can also be the same as that of the loose tube.

[0098] The loose tube fitting optical fiber ribbon cable described in the present application is characterized in that the material of the outer sheath 6 is plastic, preferably low-density polyethylene or medium-density polyethylene or high-density polyethylene or low-smoke halogen-free polyethylene or polyvinyl chloride.

[0099] Compared with the prior art, the application does not need continuous polyester yarn, and the position of the cable core is fixed, the adjacent loose tubes are combined firmly by the embedded parts, the segmented embedded parts avoid the problem that the polyester yarn is damaged due to the difference between the shrinkage or expansion coefficients of the loose tube and the polyester yarn when the temperature changes, and even the problem that the optical fiber is damaged, so that the temperature performance of the optical cable is more reliable; and the integrity of the cable core structure can be maintained under the conditions of winding, unwinding, inspection, construction, repeated bending, twisting, impact and the like; in addition, due to the use of the segmented embedded parts or even the gap embedded parts, the stripping performance of the cable core is greatly improved, and the original state can be restored quickly and conveniently as long as the embedded parts are removed; in the prior art, the polyester yarn is spiral wrapped, so it is very difficult to take out the loose tube, and the polyester yarn needs to be cut or broken, and a lot of time is also needed to restore the original state; in addition, due to the existence of the groove, the loose tube is more convenient to open and strip, and the embedded parts can be conveniently cut and the optical fiber ribbon can be taken out after the embedded parts are removed. At the same time, the application avoids the defects that the polyester yarn needs expensive wrapping equipment, occupies a large space, has high noise, is easy to be damaged and the like. Compared with the structure that the cable core is bonded by curing glue, the application is more convenient for construction, inspection and the like; at the same time, the loose tube and the embedded parts can be universal, and can be used in optical cables of different types and specifications.

[0100] The application has the following main beneficial technical effects: simple structure, easy to manufacture, more stable and reliable temperature performance; and the phenomenon that the loose tube is damaged by the polyester yarn does not occur.

[0101] The above embodiments are only preferred technical solutions of the application, and should not be regarded as a limitation of the application. The protection scope of the application should be the technical solutions recited in the claims, and include equivalent replacement solutions of the technical features recited in the claims. That is, equivalent replacement improvements within this range are also within the protection scope of the application.

Claims

1. A loose tube hybrid fiber optic cable having a central strength member (1), a plurality of loose tubes (4) located outside the central strength member (1), and an outer jacket (6), characterized in that: The application also has a plurality of fitting components (5), which are composed of a fitting body (52), a first fitting end (51) and a second fitting end (53) at both ends of the fitting body (52), the outer edge of the fitting body (52) is a part of a cylindrical surface, and the first fitting end (51) and the second fitting end (53) both extend to the axis direction of the cylinder where the outer edge of the fitting body (52) is located; the loose tube (4) is composed of a tube body (41), the outer edge of the tube body (41) has a groove (410), the inside of the loose tube (4) has a tube cavity (40) extending in the axial direction, the tube cavity (40) has at least one optical fiber ribbon, the optical fiber ribbon is composed of a plurality of optical fibers (2) and a bonding layer (3) for covering the plurality of optical fibers (2) as a whole; the groove (410) of the loose tube (4) faces the outer sheath (6), the groove (410) of each loose tube is embedded with the first fitting end (51) of one fitting component (5) and the second fitting end (53) of another fitting component (5), the first fitting end (51) and the second fitting end (53) in the groove (410) of each loose tube are in close contact with the inner wall of the groove (410) of the loose tube, the outer edges of the fitting bodies (52) of all the fitting components (5) are on the same cylindrical surface, and the outer sheath (6) covers the fitting components (5); the material of the central strength member (1) is a steel wire, an aluminum wire, an iron wire, a copper wire or a glass fiber reinforced plastic rod; the material of the loose tube (4) is polypropylene or polybutylene terephthalate; and the material of the outer sheath (6) is plastic.

2. A method of manufacturing a loose tube hybrid fiber optic cable according to claim 1, characterized by The application comprises the following steps: Step 1: color the optical fibers, so that different outer layers of the optical fibers are coated with different colors to distinguish each other; Step 2: ribbon, place a plurality of optical fibers in parallel and coat the outside with bonding paint to form an optical fiber ribbon; Step 3: form a loose tube, extrude a plastic tube through an extrusion mold and pass the optical fiber ribbon into the plastic tube, pull and cool to form a loose tube; Step 4: manufacture fitting components, form continuous fitting components by extrusion; Step 5: manufacture a cable core, pass the central strength member through the central hole of a cabling machine, pass a plurality of loose tubes formed in step 3 through the surrounding holes of the cabling machine, make the grooves of the loose tubes face outward away from the central hole, make the symmetrical axis planes of the grooves pass through the axis of the central hole, take the fitting components manufactured in step 4, embed the first fitting end of one fitting component and the second fitting end of another fitting component in the groove of each loose tube, make the first fitting end and the second fitting end in the groove of each loose tube be in close contact with the inner wall of the groove of the loose tube, simultaneously pull the central strength member, the loose tube and all the fitting components through the cylindrical forming hole and appropriately heat to bond the first fitting end and the second fitting end in the groove, form a cable core with a cylindrical surface; Step 6: manufacture a finished product, pass the cable core through the mold core hole of a sheath extrusion machine, extrude plastic and coat the outside of the cable core to form an outer sheath, and the manufacture of the loose fitting optical fiber ribbon cable is completed.

3. A loose tube stranded optical fiber cable having a central strength member (1), an even number of loose tubes (4), an outer jacket (6), all of the loose tubes (4) being located outside of the central strength member (1); characterized in that: The application also has a plurality of fitting components (5), which are composed of a fitting body (52), a first fitting end (51) and a second fitting end (53) at both ends of the fitting body (52), and a third fitting end (54) between the first fitting end (51) and the second fitting end (53). The outer edge of the fitting body (52) is a part of a cylindrical surface, and the first fitting end (51), the second fitting end (53), and the third fitting end (54) all extend towards the axis of the cylinder where the outer edge of the fitting body (52) is located. The loose tube (4) is composed of a tube body (41), and the outer edge of the tube body (41) has a groove (410). The inside of the loose tube (4) has a tube cavity (40) extending in the axial direction, and the tube cavity (40) has at least one optical fiber ribbon. The optical fiber ribbon is composed of a plurality of optical fibers (2) and a bonding layer (3) that covers the plurality of optical fibers (2) as a whole. The groove (410) on the loose tube (4) faces the outer sheath (6). In the three adjacent loose tubes, the third fitting end (54) is embedded in the groove (410) of the middle loose tube, the third fitting end (54) is in close contact with the inner wall of the groove (410) of the middle loose tube, and the first fitting end (51) of one fitting component (5) and the second fitting end (53) of another fitting component (5) are embedded in the grooves (410) of the two end loose tubes, respectively. The first fitting end (51) and the second fitting end (53) in the grooves (410) of the two end loose tubes are in close contact and in close contact with the inner wall of the groove (410) of the loose tube. The outer edges of the fitting bodies (52) of all fitting components (5) are on the same cylindrical surface, and the outer sheath (6) covers the fitting components (5). The material of the central reinforcing member (1) is steel wire or aluminum wire or iron wire or copper wire or glass fiber reinforced plastic rod. The material of the loose tube (4) is polypropylene or polybutylene terephthalate. The material of the outer sheath (6) is plastic.

4. The loose tube composite optical fiber ribbon cable of claim 1, wherein: The groove (410) of the loose tube has a protruding strip (42) extending upward from the bottom of the groove (410), and the protruding strip (42) is an integral structure with the tube body (41). The first fitting end (51) and the second fitting end (53) in the groove (410) of each loose tube are separated by the protruding strip (42).

5. The loose tube composite optical fiber ribbon cable of claim 4, wherein: The fitting components (5) are spaced along the axial direction of the optical cable.

6. A method of manufacturing a loose tube hybrid fiber optic cable according to claim 5, characterized by The method comprises the following steps: First step: coloring the optical fibers, applying different colors to the outer coatings of different optical fibers to distinguish them from each other; Second step: ribbonizing, placing a plurality of optical fibers in parallel and applying adhesive coating to the outside to form an optical fiber ribbon; Third step: forming a loose tube, extruding a plastic tube through an extrusion mold and inserting an optical fiber ribbon into the plastic tube, pulling and cooling to form a loose tube; Fourth step: manufacturing fitting components, continuously forming fitting components by extrusion and cutting them into short sections. Fifth step: manufacturing cable core, taking the central reinforcing member through the central hole of the cabling machine, taking the plurality of loose tube formed in the third step through the surrounding hole of the cabling machine, and making the groove of the loose tube away from the central hole and facing outward, making the symmetry axis plane of the groove pass through the axis of the central hole, taking the short section of the fitting member manufactured in the fourth step, embedding the first fitting end of one fitting member and the second fitting end of another fitting member in the groove of each loose tube, making the first fitting end and the second fitting end in the groove of each loose tube close to each other and close to the inner wall of the groove of the loose tube, and embedding the fitting member in sections, making the fitting members spaced along the axis of the central reinforcing member, while pulling the central reinforcing member, the loose tube and all the fitting members through the cylindrical forming hole and appropriately heating to make the first fitting end and the second fitting end bonded in the groove, forming the cable core with a cylindrical surface; Sixth step: manufacturing finished product, taking the cable core through the mold core hole of the sheath extruding machine, extruding plastic and covering the cable core to form an outer sheath, completing the manufacturing of the loose tube fitting type optical fiber ribbon cable.

7. The loose tube composite optical fiber ribbon cable of claim 5, wherein: The fitting members (5) are spaced along the axial direction of the optical cable, and adjacent fitting members (5) are staggered in space in clockwise or counterclockwise direction.

8. A method of manufacturing a loose tube hybrid fiber optic cable according to claim 7, characterized by The method comprises the following steps: First step: optical fiber coloring, coloring different optical fibers to realize two-by-two division; Second step: ribbonizing, placing a plurality of optical fibers in parallel and forming an optical fiber ribbon by bonding the outer coating with adhesive; Third step: forming loose tube, extruding plastic tube through the extruding mold and inserting the optical fiber ribbon into the plastic tube, pulling and cooling to form the loose tube; Fourth step: manufacturing fitting member, forming continuous fitting member by extrusion and cutting into short sections; Fifth step: manufacturing cable core, taking the central reinforcing member through the central hole of the cabling machine, taking the plurality of loose tube formed in the third step through the surrounding hole of the cabling machine, and making the groove of the loose tube away from the central hole and facing outward, making the symmetry axis plane of the groove pass through the axis of the central hole, taking the short section of the fitting member manufactured in the fourth step, embedding the first fitting end of one fitting member and the second fitting end of another fitting member in the groove of each loose tube, making the first fitting end and the second fitting end in the groove of each loose tube close to each other and close to the inner wall of the groove of the loose tube, and embedding the fitting member in sections, making the fitting members spaced along the axis of the central reinforcing member, while pulling the central reinforcing member, the loose tube and all the fitting members through the cylindrical forming hole and appropriately heating to make the first fitting end and the second fitting end bonded in the groove, forming the cable core with a cylindrical surface; Embedding the fitting member in sections is by pressing along the axis of the central reinforcing member; time sequence control is adopted to stagger the fitting members between adjacent loose tubes, making the adjacent fitting members staggered in space; The sixth step is to manufacture the product, pass the cable core through the mold core hole of the sheath extruder, extrude the plastic and coat the cable core to form an outer sheath, and complete the manufacturing of the loose tube embedded hybrid optical fiber cable.

9. A loose tube stranded optical fiber cable having a central strength member (1), a plurality of loose tubes (4) located outside the central strength member (1), an outer jacket (6), characterized in that: The loose tube (4) is an integrated structure, and the loose tube (4) is composed of a tube body (41), a convex strip (42), an embedded part, and at least one optical fiber ribbon. The outer wall of the tube body (41) has a groove (410), the convex strip (42) is located in the groove (410), the bottom of the convex strip (42) is integrated with the tube body (41), the convex strip (42) divides the groove (410) into two parts, the inside of the loose tube (4) has a tube cavity (40) extending in the axial direction, and at least one optical fiber ribbon is located in the tube cavity (40). Each optical fiber ribbon is composed of a plurality of optical fibers (2) and a bonding layer (3) that covers the plurality of optical fibers (2) as a whole. The embedded part is composed of an embedded body (52), a first embedded end (51) and a second embedded end (53) located at both ends of the embedded body (52). The outer edge of the embedded body (52) is part of a cylindrical surface, the first embedded end (51) and the second embedded end (53) both extend towards the axis of the cylinder where the outer edge of the embedded body (52) is located, the first embedded end (51) is located in the groove (410) and is integrated with the tube body (41), and the first embedded end (51) is located below the convex strip (42). The groove (410) on the loose tube (4) faces the outer sheath (6), and the second embedded end (53) of another embedded part is embedded in the groove (410) of each loose tube. The second embedded end (53) is located above the convex strip (42). The second embedded end (53) in the groove (410) of each loose tube is tightly attached to the inner wall of the groove (410) of the loose tube, the outer edges of the embedded bodies (52) of all embedded parts are on the same cylindrical surface, and the outer sheath (6) covers the embedded part (5). The material of the central reinforcing member (1) is steel wire or aluminum wire or iron wire or copper wire or glass fiber reinforced plastic rod. The material of the loose tube (4) is polypropylene or polybutylene terephthalate. The material of the outer sheath (6) is plastic.

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