CN211086702U

CN211086702U - Anti-shrinkage loose tube based on thermoplastic reinforcing wire MFR

Info

Publication number: CN211086702U
Application number: CN201921775055.4U
Authority: CN
Inventors: 徐济长; 陈双双
Original assignee: Anhui Hangyue Communication Equipment Co ltd
Current assignee: Anhui Hangyue Communication Equipment Co ltd
Priority date: 2019-10-22
Filing date: 2019-10-22
Publication date: 2020-07-24
Anticipated expiration: 2029-10-22

Abstract

The utility model discloses an anti-shrinkage loose tube based on thermoplastic reinforcing wire MFR, which mainly comprises a steel mesh hard armor layer, a glass fiber soft armor layer and a nylon sheath layer, wherein anti-skid semicircular strips are annularly distributed on the inner side of the steel mesh hard armor layer, and a fiber paste is filled between the steel mesh hard armor layer and an optical fiber central tube bundle; the glass fiber soft armor layer consists of a polypropylene rubber insulating layer and glass fiber yarns, wherein the glass fiber yarns are mostly embedded in the polypropylene rubber insulating layer and are slightly embedded in the nylon sheath layer; the outer ring of the nylon sheath layer is embedded with thermoplastic reinforcing wires MFR. The utility model discloses a loose tube socket adopts three-layer tensile structure's combination formula tensile structure, makes loose tube socket receive ambient temperature to influence under, only takes place the shrink of radial volume, and does not take place axial length's shrink, avoids the unfavorable phenomenon of longitudinal sliding pull-apart optical fiber core on the one hand, and on the other hand loose tube socket has certain radial volume contractibility, has guaranteed the crooked and pliability of optical cable, can use in the region that the difference in temperature is big, the environment is abominable.

Description

Anti-shrinkage loose tube based on thermoplastic reinforcing wire MFR

Technical Field

The utility model relates to a loose tube technical field especially relates to an anti shrink loose tube based on thermoplastic reinforcement MFR.

Background

In a stranded loose tube cable in which the loose tube is twisted around the central strength member, there is sufficient friction between the loose tube and the strength member so that there is no longitudinal relative movement between them. However, in a central tube bundle cable where the strength members are disposed within the jacket, the friction between the loose tube and the jacket may not be sufficient to prevent such longitudinal movement.

In areas with large environmental temperature difference, such as high and cold areas in Qinghai Tibet of China, the shrinkage of the loose tube at low temperature causes additional loss and even breakage of the optical fiber in the splice box.

Thermoplastic-processing Fiber Reinforced Plastics (MFR) is a novel Fiber material formed by combining filaments made of two materials, namely PC (polycarbonate) and L CP (lyotropic liquid crystal polymer), and the novel Fiber material is originally exposed at the head corner in the field of tensile fibers, and is also developed and applied by various foreign top-grade plastic manufacturers (such as DuPont, Dow, Gord and the like) including some domestic manufacturers.

If this thermoplastic reinforcing filament MFR can be combined with the special shrink-resistance requirement in the field of loose tubes, the axial shrink-resistance of the loose tube can be improved without affecting the flexibility and radial shrink-resistance of the loose tube, but there is no such loose tube cable structure available on the market.

SUMMERY OF THE UTILITY MODEL

The utility model aims at solving the defects in the prior art, and provides an anti-shrinkage loose tube based on thermoplastic reinforcing wire MFR.

In order to achieve the above purpose, the utility model adopts the following technical scheme:

a shrinkage-resistant loose sleeve based on thermoplastic reinforcing wire MFR mainly comprises a steel mesh hard armor layer wrapped outside an optical fiber central tube bundle, a glass fiber soft armor layer wrapped outside the steel mesh hard armor layer and a nylon sheath layer wrapped outside the glass fiber soft armor layer, wherein anti-skid semicircular strips are annularly distributed on the inner side of the steel mesh hard armor layer, and fiber paste is filled between the steel mesh hard armor layer and the optical fiber central tube bundle;

the glass fiber soft armor layer is composed of a polypropylene rubber insulating layer and glass fiber yarns embedded in the outer ring of the polypropylene rubber insulating layer, the glass fiber yarns are distributed annularly, gaps are reserved between adjacent glass fiber yarns, the majority of the glass fiber yarns are embedded in the polypropylene rubber insulating layer, the small half of the glass fiber yarns are embedded in the nylon sheath layer, and the glass fiber yarns are parallel to the optical fiber central tube bundle;

the outer ring of the nylon sheath layer is embedded with a thermoplastic reinforcing wire MFR, the whole part of the thermoplastic reinforcing wire MFR is wrapped in the nylon sheath layer, and the vertical distance between the thermoplastic reinforcing wire MFR and the outer wall of the nylon sheath layer is 0.01-0.02 mm.

Preferably, the antiskid semicircular strip is a polyurethane foam rubber strip, and the antiskid semicircular strip is welded on the inner wall of the steel mesh hard armor layer.

Preferably, a gap is reserved between adjacent anti-slip semicircular strips, and the anti-slip semicircular strips are in a spiral winding structure along the axial direction of the optical fiber central tube bundle.

Preferably, the thermoplastic reinforcing filaments MFR have a diameter in the range of 0.1-0.4 mm.

Compared with the prior art, the beneficial effects of the utility model are that:

the utility model discloses a total three layer construction of pine pipe box: namely, the steel mesh hard armor layer on the inner layer, the glass fiber soft armor layer on the middle layer and the nylon sheath layer on the outer layer are embedded with anti-skidding semicircular strips on the inner side of the steel mesh hard armor layer so as to improve the friction force between the optical fiber core and the loose pipe sleeve; the hard glass fiber yarns are embedded between the glass fiber soft armor layer and the nylon sheath layer, so that the tensile rigidity of the loose pipe sleeve is improved, and the axial shrinkage is resisted rigidly; the thermoplastic reinforcing wire MFR7 made of special materials is embedded in the outer ring layer of the nylon sheath layer, the axial shrinkage resistance of the thermoplastic reinforcing wire MFR7 is utilized, the loose tube sleeve is guaranteed to be under the influence of external temperature, only the shrinkage of the radial volume is generated, the shrinkage of the axial length is not generated, on one hand, the adverse phenomenon that the longitudinal sliding and the breaking of the optical fiber core are avoided, on the other hand, the loose tube sleeve has certain radial volume shrinkage, and the bending and the flexibility of the optical cable are guaranteed.

The utility model discloses a loose sleeve pipe has advantages such as rational in infrastructure, with low costs and anti shrink nature, has solved current loose sheathed tube shrink and longitudinal stability scheduling problem, can use in places such as the difference in temperature is big, the environment is abominable, and this kind of anti shrink loose sleeve pipe will certainly become the important component part of communication trade.

Drawings

Fig. 1 is a schematic structural view of an anti-shrinkage loose tube based on thermoplastic reinforcing filaments MFR according to the present invention;

in the figure: the cable comprises an optical fiber central tube bundle 1, a steel mesh hard armor layer 2, a glass fiber soft armor layer 3, a polypropylene rubber insulating layer 301, glass fiber yarns 302, a nylon sheath layer 4, anti-skid semicircular strips 5, fiber paste 6 and thermoplastic reinforcing wires MFR 7.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments.

Referring to fig. 1, the shrink-resistant loose tube based on thermoplastic reinforcing wire MFR is mainly composed of a steel mesh hard armor layer 2 wrapped outside an optical fiber central tube bundle 1, a glass fiber soft armor layer 3 wrapped outside the steel mesh hard armor layer 2 and a nylon sheath layer 4 wrapped outside the glass fiber soft armor layer 3, wherein antiskid semicircular strips 5 are annularly distributed on the inner side of the steel mesh hard armor layer 2, and a fiber paste 6 is filled between the steel mesh hard armor layer 2 and the optical fiber central tube bundle 1; the glass fiber soft armor layer 3 is specifically composed of a polypropylene rubber insulating layer 301 and glass fiber yarns 302 embedded in the outer ring of the polypropylene rubber insulating layer 301, the glass fiber yarns 302 are distributed annularly, the majority of the glass fiber yarns 302 are embedded in the polypropylene rubber insulating layer 301, the small half of the glass fiber yarns 302 are embedded in the nylon sheath layer 4, and the glass fiber yarns 302 are parallel to the optical fiber central tube bundle 1; the outer ring of the nylon sheath layer 4 is embedded with thermoplastic reinforcing wires MFR7, the whole part of the thermoplastic reinforcing wires MFR7 is wrapped in the nylon sheath layer 4, and the vertical distance between the thermoplastic reinforcing wires MFR7 and the outer wall of the nylon sheath layer 4 is 0.01-0.02 mm.

Referring to fig. 1, antiskid semicircle strip 5 specifically is polyurethane foam rubber strip, antiskid semicircle strip 5 butt fusion is on the 2 inner walls of steel mesh hard armor, it is gapped between the adjacent antiskid semicircle strip 5, and antiskid semicircle strip 5 is spiral winding structure along the axial of optic fibre center tube bank 1, the antislip strip is the protection optical fiber core, improve the frictional force between optical fiber core and the whole loose sheathed tube tubular structure, when tubular structure's axial shrink can guarantee, can fully drag the optical fiber core, make optical fiber core or its outer insulating layer or shielding layer not receive the shrink yet, thereby play the axial anti-shrinkage nature of strengthening the optical fiber core, improve the safety in utilization of optical cable.

Similarly, a gap is formed between the adjacent glass fiber yarns 302, so that when the loose tube contracts in the radial direction, the hard glass fiber yarns 302 can approach each other along with the contraction of the polypropylene rubber insulating layer 301, and extrusion cannot be generated.

Referring to FIG. 1, the thermoplastic reinforcing filaments MFR7 have a diameter in the range of 0.1-0.4mm, too thick affecting the flexibility of the cable, and too thin failing to provide axial tensile and shrinkage resistance; similarly, the thickness of the hard glass fiber 302 needs to be controlled within this range.

The utility model discloses a contrast test, the utility model discloses with thermoplastic reinforcement silk MFR be the cellosilk that two kinds of materials melt processing were made of PC (polycarbonate, the Dow chemical company) and L CP (liquid crystal polymer, DuPont company), the thin rope-like structure that twists together and form to with the diameter be 0.2mm MFR evenly distributed around the pine sleeve pipe, extrude MFR and pine sleeve pipe jointly, regard as contrast test with the pure PBT pine sleeve pipe of same thickness.

In the temperature cycle test, the temperature is from 50 ℃ -25 ℃ -0 ℃ to 15 ℃ below zero, each stage is placed for 1h of cycle, and the laser measurement method is adopted to test the length, the loose tube of single pure PBT material is shortened by 0.3%, the loose tube added with MFR in the application has no length change, in the aging test, the temperature is near 70 ℃, the PBT loose tube is contracted by 0.2%, the loose tube added with MFR in the application has no length change, the MFR reinforcing wire added with 20% L CP is compared with the single PBT loose tube, the cost has no obvious difference, and compared with the PBT material, the utility model discloses the cost of MFR is higher by about 0.5 kiloyuan/t.

The above, only be the concrete implementation of the preferred embodiment of the present invention, but the protection scope of the present invention is not limited thereto, and any person skilled in the art is in the technical scope of the present invention, according to the technical solution of the present invention and the utility model, the concept of which is equivalent to replace or change, should be covered within the protection scope of the present invention.

Claims

1. The anti-shrinkage loose sleeve based on the thermoplastic reinforcing wire MFR mainly comprises a steel mesh hard armor layer (2) wrapped outside an optical fiber central tube bundle (1), a glass fiber soft armor layer (3) wrapped outside the steel mesh hard armor layer (2) and a nylon sheath layer (4) wrapped outside the glass fiber soft armor layer (3), and is characterized in that anti-skidding semicircular strips (5) are annularly distributed on the inner side of the steel mesh hard armor layer (2), and a fiber paste (6) is filled between the steel mesh hard armor layer (2) and the optical fiber central tube bundle (1);

the glass fiber soft armor layer (3) is specifically composed of a polypropylene rubber insulating layer (301) and glass fiber yarns (302) embedded in the outer ring of the polypropylene rubber insulating layer (301), the glass fiber yarns (302) are distributed annularly, gaps are reserved between the adjacent glass fiber yarns (302), the majority of the glass fiber yarns (302) are embedded in the polypropylene rubber insulating layer (301), the minority of the glass fiber yarns (302) are embedded in the nylon sheath layer (4), and the glass fiber yarns (302) are parallel to the optical fiber central tube bundle (1);

the outer lane of nylon restrictive coating (4) is embedded with thermoplasticity reinforcing wire MFR (7), the whole part of thermoplasticity reinforcing wire MFR (7) all cup joints in nylon restrictive coating (4), thermoplasticity reinforcing wire MFR (7) with the perpendicular distance between nylon restrictive coating (4) outer wall is 0.01-0.02 mm.

2. A shrink-resistant loose tube based on thermoplastic reinforcement wire MFR according to claim 1, characterized in that the slip-resistant half-round strips (5) are in particular polyurethane foam rubber strips, the slip-resistant half-round strips (5) being welded to the inner wall of the steel mesh stiff armor layer (2).

3. The shrink-resistant loose tube based on thermoplastic reinforcing wire MFR of claim 2, characterized in that there is a gap between adjacent anti-slip semicircular strips (5), and the anti-slip semicircular strips (5) are spirally wound along the axial direction of the optical fiber central tube bundle (1).

4. An anti-shrink loose tube based on thermoplastic reinforcing filaments MFR according to claim 1, characterized in that the diameter of the thermoplastic reinforcing filaments MFR (7) is in the range of 0.1-0.4 mm.