CN214954252U

CN214954252U - Layer-stranded optical cable with different yarn binding pitches

Info

Publication number: CN214954252U
Application number: CN202121036521.4U
Authority: CN
Inventors: 祁庆庆; 钱峰; 何茂友; 胡古月; 胡国华; 陈保平
Original assignee: Fiberhome Telecommunication Technologies Co Ltd
Current assignee: Fiberhome Telecommunication Technologies Co Ltd
Priority date: 2021-05-14
Filing date: 2021-05-14
Publication date: 2021-11-30
Anticipated expiration: 2031-05-14
Also published as: ES1291249U8; PL130785U1; NL2031850A; NL2031850B1; ES1291249U; ES1291249Y; DE202022102602U1

Abstract

The application relates to a layer stranded optical cable with different binding yarn pitches, which comprises a central reinforcing piece, a plurality of optical fiber loose tubes and at least two binding yarns; the optical fiber loose tubes are arranged side by side and are stranded on the central reinforcing part according to a first stranding pitch to form a cable core, and an outer sheath is arranged outside the cable core; the binding yarns are positioned in the outer sheath, two binding yarns exist and are respectively stranded on the cable core according to the second stranding pitch and the third stranding pitch; the two binding yarns have opposite spiral twisting directions, and the second twisting pitch and the third twisting pitch are not equal and are both smaller than the first twisting pitch. The twisting pitches of the binding yarns are unequal and smaller than the twisting pitch of the optical fiber loose tube, so that the twisting elements are not loosened and untwisted. When the production speed is increased, the rotating speed of one of the yarn binding machines is only required to be increased to keep the twisting pitch, and the rotating speed of the other yarn binding machine is kept unchanged, so that the yarn binding speed requirement is reduced, the yarn binding cost and the yarn binding equipment cost are saved on the premise of keeping the stable twisting of the cable core, and the production efficiency is improved.

Description

Layer-stranded optical cable with different yarn binding pitches

Technical Field

The application relates to the technical field of optical fiber communication, in particular to a layer stranded optical cable with different tying pitches.

Background

Referring to fig. 1, in the related art, a core of a layer stranded optical cable is formed by twisting a plurality of optical fiber loose tubes 2 around a central strength member 1 into a circle, wherein the optical fiber loose tubes 2 refer to loose tubes containing a plurality of optical fibers, a metal or non-metal central strength member 1 is located at the center of the optical cable, and the optical fiber loose tubes 2 are arranged around the central strength member 1 with a twisting pitch, which is defined as a distance by which a twisting unit is advanced by one rotation along a twisting axis.

In order to prevent the back twist of the reversing point, referring to fig. 1, the cable cores of the layer stranded optical cable all adopt a bidirectional same-point yarn binding mode, that is, at least two binding yarns 4 with the same twisting pitch are fixed outside the cable core, and the two binding yarns 4 have different spiral twisting directions. The twisting pitch of the binding yarn 4 is usually between 20mm and 20mm, the twisting pitch of the optical fiber loose tube 2 is different according to the design requirement of the optical cable mechanical property, the twisting pitch of the optical fiber loose tube 2 can be between 55mm and 500mm, but the twisting pitch of the binding yarn 4 is not larger than the twisting pitch of the optical fiber loose tube 2, so as to ensure that the optical fiber loose tube 2 can be fixed to be formed with enough binding force, the optical fiber loose tube 2 is not loose, meanwhile, the deformation of the optical fiber loose tube 2 is not caused, and the performance degradation of the optical fiber is avoided.

When the twisting pitch of the binder yarn and the twisting pitch process of the optical fiber loose tube are fixed, in order to improve the production efficiency and increase the unit output, the twisting speed of the cable core can be improved. However, when the twisting speed of the cable core is increased:

if the twisting pitch of the two binding yarns is kept unchanged, the yarn binding speed of the two yarn binding machines needs to be increased, and under the condition that the yarn binding requirement is kept unchanged, the yarn binding speed of the two yarn binding machines needs to be increased, the control precision of the yarn binding machines needs to be increased, and therefore the production cost of the yarn binding machines is increased.

If the twisting pitch of two binding yarns is increased simultaneously to match the increase of the twisting speed of the cable core, the binding of the cable core is unstable, the loose sleeve is loosened, the reversing point is untwisted, and the final mechanical performance of the optical cable is possibly unqualified.

Disclosure of Invention

The embodiment of the application provides a layer stranded optical cable with different yarn binding pitches, and aims to solve the problem that in order to improve production efficiency, the stranding speed of a cable core and the yarn binding speed of two yarn binding machines are improved, and the production cost of the yarn binding machines is improved in the related art.

The embodiment of the application provides a layer stranded cable with different bundle yarn pitches, and this layer stranded cable includes:

a central reinforcement;

the optical fiber loose tubes are arranged side by side and are twisted on the central reinforcing piece according to a first twisting pitch to form a cable core, and an outer sheath is arranged outside the cable core;

the binding yarns are positioned in the outer sheath, wherein two binding yarns exist and are respectively stranded on the cable core according to a second stranding pitch and a third stranding pitch; and the number of the first and second groups,

the two binding yarns have opposite spiral twisting directions, and the second twisting pitch and the third twisting pitch are not equal and are both smaller than the first twisting pitch.

In this embodiment, the twisting pitches of the two binding yarns are set to be unequal, and meanwhile, the twisting pitch of the binding yarns is smaller than that of the optical fiber loose tube, so that the twisting element can be ensured not to be loosened and untwisted, and the effect of the binding yarns is ensured.

In the production process, when the twisting production speed of the cable core is increased, the rotating speed of one of the yarn binding machines is only required to be increased to keep the twisting pitch, and the rotating speed of the other yarn binding machine is kept unchanged, so that the yarn binding speed requirement of the yarn binding machines is reduced by increasing the twisting pitch of one of the yarn binding machines, the cost of yarn binding equipment can be effectively saved, and the production efficiency is improved.

When the twisting pitch of one of the binding yarns is increased, the cost of the binding yarns can be saved on the premise of keeping the stable twisting of the cable core.

In some embodiments, at least one of the second twisting pitch and the third twisting pitch is not greater than half of the first twisting pitch, so that the tying yarn has enough binding force to ensure that the twisting of the cable core is stable and not loose, and the tying yarn effect is improved.

In some embodiments, neither the second twisting pitch nor the third twisting pitch is greater than half of the first twisting pitch.

In some embodiments, a plane parallel to the central reinforcing member is used as a reference plane, and a projection connecting line of the intersection point of the two binding yarns on the reference plane is a fold line in the first twist pitch range.

In some embodiments, there are 6 optical fiber loose tubes, the first stranding pitch is 60mm, the second stranding pitch is one of 25mm and 35 mm, and the third stranding pitch is the other of 25mm and 35 mm.

In some embodiments, there are 12 optical fiber loose tubes, the first stranding pitch is 150mm, the second stranding pitch is one of 30mm and 60mm, and the third stranding pitch is the other of 30mm and 60 mm.

In some embodiments, the fiber optic loose tube is stranded on the central strength member using an SZ stranding method or a one-way spiral stranding method.

In some embodiments, the loose tube of the optical fiber loose tube is made of any one of polybutylene terephthalate (PBT), modified polypropylene (PP), Polycarbonate (PC), Polyamide (PA) and Polyethylene (PE).

In some embodiments, the central stiffener is made of any one of phosphated steel wire, galvanized steel wire, glass fiber reinforced plastic rod GFRP, and aramid fiber reinforced plastic rod KFRP.

In some embodiments, the outer sheath is made of any one of linear low density polyethylene LLDPE, medium density polyethylene MDPE, high density polyethylene HDPE, halogen-free low smoke flame retardant LSZH, polyvinyl chloride PVC, and thermoplastic polyurethane elastomer rubber TPU.

The beneficial effect that technical scheme that this application provided brought includes:

the embodiment of the application provides a layer stranded optical cable with different yarn binding pitches, the application sets the twisting pitch of two binding yarns to be unequal, and simultaneously, in order to ensure the yarn binding effect, the twisting pitch of the binding yarns is smaller than that of an optical fiber loose tube, so that the loosening and untwisting of a twisting element are ensured.

When the stranding production speed of the cable core is increased, the rotating speed of one of the yarn binding machines is only required to be increased to keep the stranding pitch, and the rotating speed of the other yarn binding machine is kept unchanged, so that the yarn binding speed requirement of the yarn binding machines is reduced by increasing the stranding pitch of one of the yarn binding machines, the cost of yarn binding equipment can be effectively saved, and the production efficiency is improved.

In order to further improve the yarn binding effect, at least one of the second twisting pitch and the third twisting pitch is not more than half of the first twisting pitch, so that the binding yarn has enough binding force to ensure that the twisting of the cable core is stable and not loose.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.

Fig. 1 is a schematic view of a related art layer-stranded optical cable in which two binder yarns have the same stranding pitch;

FIG. 2 is a schematic view of a layer-stranded cable having two binder yarns with different stranding pitches according to one embodiment of the present application;

fig. 3 is a schematic view of a layer-stranded optical cable having two binder yarns with different stranding pitches according to another embodiment of the present application.

In the figure: 1. a central reinforcement; 2. an optical fiber loose tube; 3. an outer sheath; 4. yarn binding; 5. the intersection point.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some embodiments of the present application, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

The embodiment of the application provides a layer stranded optical cable with different yarn binding pitches, which can solve the problem that in order to improve the production efficiency, the stranding speed of a cable core and the yarn binding speed of two yarn binding machines are improved, so that the production cost of the yarn binding machines is improved in the related art.

Referring to fig. 2, a layer stranded optical cable having different binder pitches includes a central strength member 1, a plurality of optical fiber loose tubes 2, and at least two binder yarns 4; the optical fiber loose tubes 2 are arranged side by side and are stranded on the central reinforcing member 1 according to a first stranding pitch to form a cable core, and an outer sheath 3 is arranged outside the cable core; the binding yarns 4 are positioned in the outer sheath 3, wherein two binding yarns 4 exist, and the two binding yarns 4 are respectively stranded on the cable core according to a second stranding pitch and a third stranding pitch; and the two binding yarns 4 have opposite spiral twisting directions, and the second twisting pitch and the third twisting pitch are not equal and are both smaller than the first twisting pitch.

The twisting pitches of the two binding yarns 4 are unequal, and meanwhile, in order to guarantee the effect of the binding yarns, the twisting pitch of the binding yarns 4 is smaller than that of the optical fiber loose tube 2, so that the twisting elements are guaranteed not to be loose and untwisted.

In order to further improve the yarn binding effect, in a preferred embodiment, at least one of the second twisting pitch and the third twisting pitch is not more than half of the first twisting pitch, so as to ensure that the binding yarn 4 has enough binding force to ensure that the twisting of the cable core is stable and not loose.

In a preferred embodiment, neither the second twisting pitch nor the third twisting pitch is greater than half the first twisting pitch.

In a preferred embodiment, a projection line of the intersection 5 of the two bundles of yarns 4 on the reference plane is a fold line in the first twist pitch range, taking a plane parallel to the central reinforcing member 1 as the reference plane.

In a preferred embodiment, referring to fig. 2, in the present embodiment, the optical fiber loose tube 2 has an outer diameter of 1.6mm, the central strength member 1 has an outer diameter of 1.7mm, 6 optical fiber loose tubes 2 are wound around the central strength member 1 in an SZ-stranding manner, 6 optical fiber loose tubes 2 have a stranding pitch of 60mm, i.e., a first stranding pitch of 60mm, two binder yarns 4 are provided with different stranding pitches having opposite helical stranding directions, i.e., a second stranding pitch of one of 25mm and 35 mm, and a third stranding pitch of the other of 25mm and 35 mm.

Compared with two cable cores with the same twisting pitch (25mm) of the binding yarns in the related art, the twisting efficiency can be effectively improved, and the using amount of the binding yarns 4 with the twisting pitch of 60mm is reduced.

In a preferred embodiment, referring to fig. 3, in the present embodiment, the optical fiber loose tube 2 has an outer diameter of 2.3mm, the central strength member 1 has an outer diameter of 7.4mm, 12 optical fiber loose tubes 2 are wound around the central strength member 1 in an SZ stranding manner, 12 optical fiber loose tubes 2 have a stranding pitch of 150mm, i.e., a first stranding pitch of 150mm, two binder yarns 4 are provided with different stranding pitches having opposite helical stranding directions, i.e., a second stranding pitch of one of 30mm and 60mm, and a third stranding pitch of the other of 30mm and 60 mm.

Compared with two cable cores with the same binding yarn twisting pitch (30mm) in the related art, the twisting efficiency can be effectively improved, and the using amount of the binding yarn 4 with the twisting pitch of 60mm is reduced.

In a preferred embodiment, the optical fiber loose tube 2 is stranded on the central strength member 1 in an SZ stranding method, and in addition, the optical fiber loose tube 2 may be stranded on the central strength member 1 in an unidirectional spiral stranding method, which method is adopted for stranding, which method is not mandatory in the present application, and may be selected according to actual conditions.

In a preferred embodiment, the loose tube of the optical fiber loose tube 2 is made of any one of polybutylene terephthalate (pbt) (polybutylene terephthalate), modified polypropylene (pp), Polycarbonate (PC), Polyamide (PA) and Polyethylene (PE).

In a preferred embodiment, the central stiffener 1 is made of any one of phosphated steel wire, galvanized steel wire, glass Fiber Reinforced plastic rods gfrp (glass Fiber Reinforced plastics) and aramid Fiber Reinforced plastic rods kfrp (kevlar Fiber Reinforced plastics).

In a preferred embodiment, the outer sheath 3 is made of any one of linear Low Density polyethylene LLDPE (Linear Low Density polyethylene), medium Density polyethylene MDPE (Medium Density polyethylene), high Density polyethylene HDPE (high Density polyethylene), Halogen-free Low Smoke flame retardant LSZH (Low Smoke Zero Halogen compositions), polyvinyl chloride PVC and thermoplastic polyurethane elastomer rubber TPU.

In summary, in the present application, the twisting pitches of the two binding yarns are set to be different, and meanwhile, the twisting pitch of the binding yarns is smaller than that of the optical fiber loose tube, so that the twisting element is ensured not to be loosened and untwisted, and the effect of the binding yarns is ensured.

In addition, in order to further improve the yarn binding effect, at least one of the second twisting pitch and the third twisting pitch is not more than half of the first twisting pitch, so that the binding yarn has enough binding force to ensure that the twisting of the cable core is stable and not loose.

In the description of the present application, it should be noted that the terms "upper", "lower", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, which are only for convenience in describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and operate, and thus, should not be construed as limiting the present application. Unless expressly stated or limited otherwise, the terms "mounted," "connected," and "connected" are intended to be inclusive and mean, for example, that they may be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as appropriate.

It is noted that, in the present application, relational terms such as "first" and "second", and the like, are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.

The above description is merely exemplary of the present application and is presented to enable those skilled in the art to understand and practice the present application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the application. Thus, the present application is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A layer stranded optical cable having different binder pitches, comprising:

a central reinforcement (1);

the optical fiber loose tubes (2) are arranged side by side and are twisted on the central reinforcing piece (1) according to a first twisting pitch to form a cable core, and an outer sheath (3) is arranged outside the cable core;

at least two binding yarns (4), wherein the binding yarns (4) are positioned in the outer sheath (3), and the two binding yarns (4) are twisted on the cable core according to a second twisting pitch and a third twisting pitch respectively; and the number of the first and second groups,

the two binding yarns (4) are opposite in spiral twisting direction, and the second twisting pitch and the third twisting pitch are not equal and are both smaller than the first twisting pitch.

2. The layer-stranded optical cable having different binder pitches as defined in claim 1, wherein: at least one of the second twisting pitch and the third twisting pitch is not greater than half of the first twisting pitch.

3. The layer-stranded optical cable having different binder pitches as defined in claim 2, wherein: the second twisting pitch and the third twisting pitch are both not greater than half of the first twisting pitch.

4. The layer-stranded optical cable having different binder pitches as defined in claim 1, wherein: and taking a plane parallel to the central reinforcing member (1) as a reference plane, and in the first stranding pitch range, taking a projection connecting line of a cross point (5) of the two binding yarns (4) on the reference plane as a fold line.

5. The layer-stranded optical cable having different binder pitches as defined in claim 1, wherein: the number of the optical fiber loose tubes (2) is 6, the first twisting pitch is 60mm, the second twisting pitch is one of 25mm and 35 mm, and the third twisting pitch is the other of 25mm and 35 mm.

6. The layer-stranded optical cable having different binder pitches as defined in claim 1, wherein: the number of the optical fiber loose tubes (2) is 12, the first stranding pitch is 150mm, the second stranding pitch is one of 30mm and 60mm, and the third stranding pitch is the other of 30mm and 60 mm.

7. The layer-stranded optical cable having different binder pitches as defined in claim 1, wherein: the optical fiber loose tube (2) is stranded on the central reinforcing member (1) in an SZ stranding mode or a one-way spiral stranding mode.

8. The layer-stranded optical cable having different binder pitches as defined in claim 1, wherein: the loose tube of the optical fiber loose tube (2) is made of any one of polybutylene terephthalate (PBT), modified polypropylene, Polycarbonate (PC), Polyamide (PA) and Polyethylene (PE).

9. The layer-stranded optical cable having different binder pitches as defined in claim 1, wherein: the central reinforcement (1) is made of any one of phosphated steel wires, galvanized steel wires, glass fiber reinforced plastic rods GFRP and aramid fiber reinforced plastic rods KFRP.

10. The layer-stranded optical cable having different binder pitches as defined in claim 1, wherein: the outer sheath (3) is made of any one of linear low-density polyethylene LLDPE, medium-density polyethylene MDPE, high-density polyethylene HDPE, halogen-free low-smoke flame-retardant LSZH, polyvinyl chloride PVC and thermoplastic polyurethane elastomer rubber TPU.