CN104749729A

CN104749729A - Method for manufacturing layer-stranding cable

Info

Publication number: CN104749729A
Application number: CN201510196789.7A
Authority: CN
Inventors: 吴俊�
Original assignee: 吴俊�
Current assignee: Guangdong BEIC Network Co., Ltd.
Priority date: 2015-04-23
Filing date: 2015-04-23
Publication date: 2015-07-01
Anticipated expiration: 2035-04-23
Also published as: CN104749729B; CN107121745A; CN107092060A

Abstract

The invention belongs to the technical field of cables, and particularly relates to a method for manufacturing a layer-stranding cable. The method for manufacturing the layer-stranding cable is characterized by comprising a light-guide fiber coloring step, a loose tube forming step, a cable core forming step and a protective jacket layer forming step. The method for manufacturing the layer-stranding cable has the advantages that the layer-stranding cable is simple in structure and easy to manufacture, the cost is saved, the optical performance is stable after a wide temperature variation range is changed, and used machinery equipment is simple, and investment is low, a water resisting effect is excellent, and the length of a cable core can be known.

Description

A kind of method of fabrication layer stranded cables

Technical field

The invention belongs to technical field of cables, especially relate to a kind of layer-stranding cable and manufacture method.

Background technology

People's Republic of China's post and telecommunications industry standard: the basic structure and the requirement that define layer-stranding cable in YD/T 901-2009; its layer-stranding cable be by many Loose tube and presumable gasket for packing stranded around central reinforce member; then dress outside yarn class material at intertwist body and form cable core; cable core structure is stablized; then at cable core bag coated protective seam formation layer-stranding cable again, fill in cable core gap or do not fill the material that blocks water.Mainly there is following defect in this structure: higher for wrapping yarn class material requirement, enough intensity should be had, fracture is unlikely in machine wrapping, require that again having low temperature becomes contraction or expansion performance, if it is excessive that temperature becomes contraction, easily cause and stab Loose tube, cause fibercuts what is more, have a strong impact on communication; If warm variable expansion is excessive, wrapping can be made not tight, insecure, cause intertwist body coiling or scattering in using, Loose tube is out of shape and causes Optical Fiber Transmission performance to reduce.On the other hand, reach effectively block water to make optical cable core, need all to fill the material that blocks water intertwist body is inside and outside, the filling of the material that blocks water needs the equipment of specialty, and not easily reaches desirable block-water effect.Current sheath material is when having anti-flammability, and process velocity is on the low side, after making sheath, and anti-electrocorrosion poor-performing.Intertwist body, owing to using the wrapping of yarn class material, therefore, cannot learn the length of intertwist body by easy method.For this reason, people expect have better method to solve the problems referred to above.

Summary of the invention

In order to solve the problem, the object of the invention is the manufacture method disclosing a kind of layer-stranding cable; It realizes by the following technical solutions.

A method for fabrication layer stranded cables, is characterized in that it includes following steps:

The first step: the step of colouring optical fibres: get G.652 type or G.653 type G.654 type or G.655 type G.656 type or G.657 type or A1a type or A1b type or A1c type or A1d type or OM1 type or OM2 type or the naked light transmitting fiber of OM3 type on optical fiber coloring machine, carry out UV solidification painted, make the thickness of dyed layer be 1 ~ 3 μm, color solidification degree >=85%; Repeated multiple times, form many light transmitting fibers, any two different fibre-optic dyed layers have different colors;

Second step: Loose tube forming step: get modified polypropene or polybutylene terephthalate melts in the spiral shell chamber of secondary coated extruding machine, and the color masterbatch adding the color masterbatch of 1% ~ 3% of modified polypropene general assembly (TW) or 1% ~ 3% of polybutylene terephthalate general assembly (TW) melts together and stirs; Be there is by the stretched inside of the extrusion head of secondary coated extruding machine the original Loose tube of cavity, the light transmitting fiber that the first step is formed is penetrated in the cavity of original Loose tube inside simultaneously, drawing original Loose tube makes the light transmitting fiber in cavity move the bosh of 20 ~ 40 DEG C with original Loose tube, form finished product Loose tube, fibre-optic length in finished product Loose tube is 1.002 ~ 1.008 times of finished product Loose tube length, the light transmitting fiber in finished product Loose tube at least one; Repeated multiple times, form many finished product Loose tube;

3rd step: cable core forming step: (1) get steel wire or fiberglass-reinforced plastic lever to be placed on the reinforcement discharge device of cable-former as reinforcement and pull-out through the first stranded mould the first medium pore, then through the second stranded mould the first center pit, after the first interstitial hole of the 3rd stranded mould, cross cable core hole again through extrusion head inside; (2) that second step is formed and around the finished product Loose tube on dish tool by rolling wheels and through the first stranded mould the first edge hole, again through the second stranded mould the first hole, edge, then through the 3rd stranded mould the first holes around, then emptyly cross crossing cable core hole and guaranteeing that finished product Loose tube is positioned at outside reinforcement of extrusion head inside; There are many Loose tube and Loose tube is positioned at adjacent position time make adjacent Loose tube tangent; (3) get the gasket for packing that polypropylene or polythene material make, through the first stranded mould the first edge hole, again through the second stranded mould the first hole, edge, then through the 3rd stranded mould the first holes around, then emptyly cross crossing cable core hole and guaranteeing that finished product gasket for packing is positioned at outside reinforcement of extrusion head inside; Have many gasket for packings and gasket for packing is positioned at adjacent position time make adjacent gasket for packing tangent, gasket for packing and adjacent Loose tube tangent; (4) reinforcement of extrusion head, gasket for packing and Loose tube was drawn, and make the first stranded mould, the second stranded mould, the 3rd stranded mould keeps motionless, the polypropylene of melting or tygon or polybutylene terephthalate are injected the injecting hole of extrusion head, adopt air extractor to make the polypropylene of melting or tygon or polybutylene terephthalate be close to finished product Loose tube in the right-hand member exit crossing cable core hole and gasket for packing forms fixed bed outward; And then formation cable core; The quantity of Loose tube and the quantity sum of gasket for packing are not less than 3;

Wherein, dish tool can rotate relative to fixing Fang Guan mechanism, and rolling wheels are positioned at the top of Fang Guan mechanism; Releasing direction along Loose tube: the front that Fang Guan mechanism is positioned at the rear of the first stranded mould, the second stranded mould is positioned at the first stranded mould, the 3rd stranded mould are positioned at the front of the second stranded mould, extrusion head is positioned at the 3rd stranded mould front; First medium pore, the first edge hole run through the first stranded mould and the first medium pore is positioned at the central authorities of the first stranded mould, first edge hole has multiple and to be distributed in outside the first medium pore and the first edge hole does not communicate with the first medium pore, and the distance of the first medium pore central axis and the first edge hole central axis is the first spacing; First center pit, the first hole, edge run through the second stranded mould and the first center pit is positioned at the central authorities of the second stranded mould, first hole, edge has multiple and is distributed in outside the first center pit and the first hole, edge and does not communicate with the first center pit, and the distance of the first center pit central axis and the first hole, edge central axis is the second spacing; First interstitial hole, the first holes around run through the second stranded mould and the first interstitial hole is positioned at the central authorities of the second stranded mould, first holes around has multiple and to be distributed in outside the first interstitial hole and the first holes around does not communicate with the first interstitial hole, first hole, edge has multiple and is distributed in outside the first center pit and the first hole, edge and does not communicate with the first center pit, and the distance of the first interstitial hole central axis and the first holes around central axis is the 3rd spacing; First spacing > second spacing > the 3rd spacing; The injecting hole of extrusion head is connected with mistake cable core hole; Distance between first stranded mould and the second stranded mould is 1000 ~ 2000mm, distance between second stranded mould and the 3rd stranded mould is 500 ~ 1000mm, and the distance between the first stranded mould and the second stranded mould is 2 ~ 5 times of the distance between the second stranded mould and the 3rd stranded mould;

4th step: restrictive coating forming step: low-smoke non-halogen flame-retardant tygon or linear low density polyethylene or Low Density Polyethylene or medium density polyethylene or high density polyethylene are coated on outside the cable core that the 3rd step formed by sheath extruding machine extrusion molding, form restrictive coating, complete the making of layer-stranding cable.

Layer-stranding cable in the present invention have structure simple, be easy to make, more save cost, stable optical performance after the temperature scope that broadens becomes, the machinery and equipment of use is simple, less investment; The beneficial effects such as block-water effect is excellent, cable core length is known.

Accompanying drawing explanation

Fig. 1 is the cross-sectional structure schematic diagram of the invention process example 1.

Fig. 2 is the cross-sectional structure schematic diagram of the invention process example 2.

Fig. 3 is the cross-sectional structure schematic diagram of the invention process example 3.

Fig. 4 is the cross-sectional structure schematic diagram of the invention process example 4.

Fig. 5 is the perspective view of the stranded part used in manufacture method of the present invention.

Embodiment

Embodiment 1 to embodiment 4 is embodiments of layer-stranding cable in the present invention; Embodiment 5 is embodiments of method for making in the present invention.

embodiment 1

Ask for an interview Fig. 1, layer-stranding cable, it includes cable core and extrusion molding and is coated on restrictive coating 6 outside cable core, it is characterized in that described cable core by be positioned at central authorities reinforcement 3, form around stranded three Loose tube 1 of reinforcement, the fixed bed 4 that all Loose tube integral coating are lived, the packed layer 5 be positioned at outside fixed bed, any two adjacent Loose tube are mutually circumscribed, all have eight light transmitting fibers 2 in every root Loose tube; Fixed bed is liquid sealing relative to the Loose tube of inside, and the material of fixed bed is polypropylene or tygon or polybutylene terephthalate.

Layer-stranding cable described above, is characterized in that described Loose tube can be other many, and the light transmitting fiber in every root Loose tube at least has one.

Further, layer-stranding cable described above, it is characterized in that described adjacent Loose tube can also be nontangential mutually between two, and the spacing maximum between adjacent Loose tube is 0.2mm; Fixed bed extend in the internal clearance of Loose tube formation.

Layer-stranding cable described above, it is characterized in that the material of described packed layer is polypropylene or tygon, and the material of packed layer and the material of fixed bed is not identical.

Layer-stranding cable described above, it includes cable core and extrusion molding and is coated on restrictive coating outside cable core, it is characterized in that described cable core by be positioned at central authorities reinforcement, form around the stranded many Loose tube of reinforcement, the fixed bed that all Loose tube integral coating are lived, the packed layer be positioned at outside fixed bed, any two adjacent Loose tube are mutually circumscribed, all have at least one light transmitting fiber in every root Loose tube; Fixed bed is liquid sealing relative to the Loose tube of inside, and the material of fixed bed is polypropylene or tygon or polybutylene terephthalate.

embodiment 2

Ask for an interview Fig. 2, layer-stranding cable, it includes cable core and extrusion molding and is coated on restrictive coating 6 outside cable core, it is characterized in that described cable core by be positioned at central authorities reinforcement 3, around stranded seven Loose tube 1 of reinforcement, the fixed bed 4 that all Loose tube integral coating are lived is formed, the Loose tube of arbitrary neighborhood is nontangential mutually between two, and the spacing maximum between adjacent Loose tube is 0.2mm, fixed bed extend in the internal clearance of Loose tube formation, all has eight light transmitting fibers 2 in every root Loose tube; Fixed bed is liquid sealing relative to the Loose tube of inside, and the material of fixed bed is polypropylene or tygon or polybutylene terephthalate.

Layer-stranding cable described above can also be adjacent Loose tube is mutually circumscribed, and fixed bed does not extend in the internal clearance of Loose tube formation.

embodiment 3

Ask for an interview Fig. 3, layer-stranding cable, substantially with embodiment 2, difference is that wherein two Loose tube are filled rope 7 and replaces; The material of gasket for packing is polypropylene or tygon.

Layer-stranding cable in this embodiment, it includes cable core and extrusion molding and is coated on restrictive coating outside cable core, it is characterized in that described cable core is by the reinforcement being positioned at central authorities, around at least one Loose tube that reinforcement is stranded, at least one gasket for packing, the fixed bed of all Loose tube and gasket for packing integral coating being lived is formed, when having many Loose tube, the Loose tube of arbitrary neighborhood is nontangential mutually, and the spacing maximum between adjacent Loose tube is 0.2mm, when having many gasket for packings, the gasket for packing of arbitrary neighborhood is nontangential mutually, and the spacing maximum between adjacent gasket for packing is 0.2mm, adjacent Loose tube and gasket for packing are nontangential mutually, and the spacing maximum between adjacent Loose tube and gasket for packing is 0.2mm, fixed bed extend into Loose tube, in the internal clearance that gasket for packing is formed, in every root Loose tube, all there is at least one light transmitting fiber, the quantity of Loose tube and the quantity sum of gasket for packing are not less than 3, fixed bed is liquid sealing relative to the Loose tube of inside and gasket for packing, and the material of fixed bed is polypropylene or tygon or polybutylene terephthalate.

Further, layer-stranding cable described in this embodiment, it includes cable core and extrusion molding and is coated on restrictive coating outside cable core, it is characterized in that described cable core is by the reinforcement being positioned at central authorities, around at least one Loose tube that reinforcement is stranded, at least one gasket for packing, the fixed bed of all Loose tube and gasket for packing integral coating being lived is formed, when having many Loose tube, the Loose tube of arbitrary neighborhood is tangent, when having many gasket for packings, the gasket for packing of arbitrary neighborhood is tangent, adjacent Loose tube and gasket for packing are tangent, in every root Loose tube, all there is at least one light transmitting fiber, the quantity of Loose tube and the quantity sum of gasket for packing are not less than 3, fixed bed is liquid sealing relative to the Loose tube of inside and gasket for packing, and the material of fixed bed is polypropylene or tygon or polybutylene terephthalate.

embodiment 4

Ask for an interview Fig. 4, layer-stranding cable, it includes cable core, be positioned at the first protective seam 8 outside cable core, be positioned at the second protective seam 9 outside the first protective seam, and extrusion molding is coated on the restrictive coating 6 outside the second protective seam, it is characterized in that described cable core is by the reinforcement 3 being positioned at central authorities, around five Loose tube 1 that reinforcement is stranded, two gasket for packings 7, the fixed bed 4 that all Loose tube and all gasket for packing integral coating are lived is formed, the Loose tube of arbitrary neighborhood is nontangential mutually between two, the Loose tube of arbitrary neighborhood and gasket for packing are nontangential mutually between two, the gasket for packing of arbitrary neighborhood is nontangential mutually between two, and the spacing maximum between adjacent Loose tube is 0.2mm, spacing maximum between adjacent gasket for packing is 0.2mm, spacing maximum between adjacent Loose tube and gasket for packing is 0.2mm, fixed bed extend in the internal clearance of Loose tube and gasket for packing formation, all there are in every root Loose tube eight light transmitting fibers 2, fixed bed is liquid sealing relative to the Loose tube of inside and gasket for packing, and the material of fixed bed is polypropylene or tygon or polybutylene terephthalate, the material of the first protective seam is waterstop, and the material of the second protective seam is steel band or aluminium strip.

Certainly, in this embodiment, can also be be be tangent between tangent, adjacent Loose tube and gasket for packing between tangent, adjacent gasket for packing between adjacent Loose tube.

Layer-stranding cable described in this embodiment, it includes cable core, be positioned at the first protective seam outside cable core, be positioned at the second protective seam outside the first protective seam, and extrusion molding is coated on the restrictive coating outside the second protective seam, it is characterized in that described cable core is by the reinforcement being positioned at central authorities, around at least one Loose tube that reinforcement is stranded, at least one gasket for packing, the fixed bed of all Loose tube and all gasket for packing integral coating being lived is formed, when having many Loose tube, the Loose tube of arbitrary neighborhood is nontangential mutually, and the spacing maximum between adjacent Loose tube is 0.2mm, when having many gasket for packings, the gasket for packing of arbitrary neighborhood is nontangential mutually, and the spacing maximum between adjacent gasket for packing is 0.2mm, adjacent Loose tube and gasket for packing are nontangential mutually, and the spacing maximum between adjacent Loose tube and gasket for packing is 0.2mm, fixed bed extend into Loose tube, in the internal clearance that gasket for packing is formed, in every root Loose tube, all there is at least one light transmitting fiber, the quantity of Loose tube and the quantity sum of gasket for packing are not less than 3, fixed bed is liquid sealing relative to the Loose tube of inside and gasket for packing, and the material of fixed bed is polypropylene or tygon or polybutylene terephthalate, the material of the first protective seam is waterstop, and the material of the second protective seam is steel band or aluminium strip.

Further, layer-stranding cable described in this embodiment, it includes cable core, be positioned at the first protective seam outside cable core, be positioned at the second protective seam outside the first protective seam, and extrusion molding is coated on the restrictive coating outside the second protective seam, it is characterized in that described cable core is by the reinforcement being positioned at central authorities, around at least one Loose tube that reinforcement is stranded, at least one gasket for packing, the fixed bed of all Loose tube and all gasket for packing integral coating being lived is formed, when having many Loose tube, the Loose tube of arbitrary neighborhood is tangent, when having many gasket for packings, the gasket for packing of arbitrary neighborhood is tangent, adjacent Loose tube and gasket for packing are tangent, in every root Loose tube, all there is at least one light transmitting fiber, the quantity of Loose tube and the quantity sum of gasket for packing are not less than 3, fixed bed is liquid sealing relative to the Loose tube of inside and gasket for packing, and the material of fixed bed is polypropylene or tygon or polybutylene terephthalate, the material of the first protective seam is waterstop, and the material of the second protective seam is steel band or aluminium strip.

In this embodiment, the difference depending on application scenario can also be omitted separately the first protective seam or omit the second protective seam separately.

In embodiment 3 and embodiment 4, being not limited to two gasket for packings, can be other many gasket for packings, also can be an only gasket for packing.

Certainly, the layer-stranding cable in the invention process example 1 to embodiment 3 described in arbitrary embodiment, as embodiment 4, can arrange the first protective seam and the second protective seam between cable core and restrictive coating; Further, can also the first protective seam be only set between cable core and restrictive coating or the second protective seam is only set.

Layer-stranding cable described in above-mentioned arbitrary embodiment, can also arranging multiple protective seam, as first arranged steel belt layer, then arranging external sheath layer outside restrictive coating, more effectively can protect optical fiber wherein like this, the performances such as mechanical resistance to compression are strengthened greatly; Nylon layer can also be set outside restrictive coating, the object of anti-ant can be reached like this; Etc., numerous.

Layer-stranding cable described in above-mentioned arbitrary embodiment, is characterized in that the material of described reinforcement is steel wire or fiberglass-reinforced plastic lever.

As simplifying further, layer-stranding cable described in above-mentioned embodiment 1,2, is characterized in that the Loose tube in described cable core can also be arranged in parallel, instead of stranded setting, be arranged in parallel the stranding device can saved in cabling device, even do not need cabling device; Certainly, Loose tube and optical fiber can also be saved due to the length of stranded generation, cost can be saved further.

As simplifying further, layer-stranding cable described in above-mentioned embodiment 3,4, is characterized in that the Loose tube in described cable core, gasket for packing can also be arranged in parallel, instead of stranded setting, be arranged in parallel the stranding device can saved in cabling device, even do not need cabling device; Certainly, Loose tube and optical fiber can also be saved due to the length of stranded generation, cost can be saved further.

Layer-stranding cable described in above-mentioned arbitrary embodiment, is characterized in that the material of described restrictive coating is low-smoke non-halogen flame-retardant tygon or linear low density polyethylene or Low Density Polyethylene or medium density polyethylene or high density polyethylene.

Layer-stranding cable described in above-mentioned arbitrary embodiment, is characterized in that the material of described Loose tube is modified polypropene or polybutylene terephthalate.

Layer-stranding cable described in above-mentioned arbitrary embodiment, is characterized in that described light transmitting fiber is G.652 type or G.653 type or G.654 type or G.655 type or G.656 type or G.657 type or A1a type or A1b type or A1c type or A1d type or OM1 type or OM2 type or OM3 type.

embodiment 5

Ask for an interview Fig. 5, and referring to figs. 1 to Fig. 4, the method for a kind of fabrication layer stranded cables described in embodiment 1, is characterized in that it includes following steps:

The first step: the step of colouring optical fibres: get G.652 type or G.653 type G.654 type or G.655 type G.656 type or G.657 type or A1a type or A1b type or A1c type or A1d type or OM1 type or OM2 type or the naked light transmitting fiber of OM3 type on optical fiber coloring machine, carry out UV solidification painted, make the thickness of dyed layer be 1 ~ 3 μm, color solidification degree >=85%; Eight times repeatedly, form eight light transmitting fibers, any two different fibre-optic dyed layers have different colors;

Second step: Loose tube forming step: get modified polypropene or polybutylene terephthalate melts in the spiral shell chamber of secondary coated extruding machine, and the color masterbatch adding the color masterbatch of 1% ~ 3% of modified polypropene general assembly (TW) or 1% ~ 3% of polybutylene terephthalate general assembly (TW) melts together and stirs; Be there is by the stretched inside of the extrusion head of secondary coated extruding machine the original Loose tube of cavity, the light transmitting fiber that the first step is formed is penetrated in the cavity of original Loose tube inside simultaneously, drawing original Loose tube makes the light transmitting fiber in cavity move the bosh of 20 ~ 40 DEG C with original Loose tube, form finished product Loose tube, the fibre-optic length in finished product Loose tube is 1.002 ~ 1.008 times of finished product Loose tube length; Three times repeatedly, form three finished product Loose tube 2;

3rd step: cable core forming step: (1) get steel wire or fiberglass-reinforced plastic lever to be placed on the reinforcement discharge device of cable-former as reinforcement 3 and pull-out through the first stranded mould 41 the first medium pore 410, then through the second stranded mould 42 the first center pit, after the first interstitial hole of the 3rd stranded mould 43, cross cable core hole 52 again through extrusion head 51 inside; (2) that second step is formed and around the finished product Loose tube 2 on the first dish tool 11 by the first rolling wheels 31 and through the first stranded mould 41 the first edge hole 411, again through the second stranded mould 42 the first hole, edge 421, then through the 3rd stranded mould 43 the first holes around 431, then emptyly cross crossing cable core hole and guaranteeing that finished product Loose tube is positioned at outside reinforcement of extrusion head 51 inside; That second step is formed and around the finished product Loose tube 2 on the second dish tool 12 by the second rolling wheels 32 and through the first stranded mould 41 the first edge hole 411, again through the second stranded mould 42 the first hole, edge 421, then through the 3rd stranded mould 43 the first holes around 431, then emptyly cross crossing cable core hole and guaranteeing that finished product Loose tube is positioned at outside reinforcement of extrusion head 51 inside; That second step is formed and around the finished product Loose tube 2 on the 3rd dish tool 13 by the 3rd rolling wheels 33 and through the first stranded mould 41 the first edge hole 411, again through the second stranded mould 42 the first hole, edge 421, then through the 3rd stranded mould 43 the first holes around 431, then emptyly cross crossing cable core hole and guaranteeing that finished product Loose tube is positioned at outside reinforcement of extrusion head 51 inside; Make adjacent Loose tube tangent; (3) reinforcement and the Loose tube of extrusion head was drawn, and make the first stranded mould, the second stranded mould, the 3rd stranded mould keeps motionless, the polypropylene of melting or tygon or polybutylene terephthalate are injected the injecting hole 53 of extrusion head, adopt air extractor to make the polypropylene of melting or tygon or polybutylene terephthalate be close to finished product Loose tube in the right-hand member exit crossing cable core hole and form fixed bed outward; (4) bar getting polypropylene or tygon formation is filled in outside fixed bed and forms packed layer; And then formation cable core; The material of packed layer and the material of fixed bed are not identical;

Wherein, the first dish tool 11 can rotate relative to the first fixing Fang Guan mechanism 21, and the first rolling wheels 31 are positioned at the top of the first Fang Guan mechanism 21; Second dish tool 12 can rotate relative to the second fixing Fang Guan mechanism 22, and the second rolling wheels 32 are positioned at the top of the second Fang Guan mechanism 22; 3rd dish tool 13 can rotate relative to the 3rd fixing Fang Guan mechanism 23, and the 3rd rolling wheels 33 are positioned at the top of the 3rd Fang Guan mechanism 23; Releasing direction along Loose tube: the front that the front that the 3rd Fang Guan mechanism is positioned at the front of the second Fang Guan mechanism, the second Fang Guan mechanism is positioned at the first Fang Guan mechanism, the first Fang Guan mechanism are positioned at the rear of the first stranded mould, the second stranded mould is positioned at the first stranded mould, the 3rd stranded mould are positioned at the front of the second stranded mould, extrusion head is positioned at the 3rd stranded mould front; First medium pore, the first edge hole run through the first stranded mould and the first medium pore is positioned at the central authorities of the first stranded mould, first edge hole has multiple and to be distributed in outside the first medium pore and the first edge hole does not communicate with the first medium pore, and the distance of the first medium pore central axis and the first edge hole central axis is the first spacing; First center pit, the first hole, edge run through the second stranded mould and the first center pit is positioned at the central authorities of the second stranded mould, first hole, edge has multiple and is distributed in outside the first center pit and the first hole, edge and does not communicate with the first center pit, and the distance of the first center pit central axis and the first hole, edge central axis is the second spacing; First interstitial hole, the first holes around run through the second stranded mould and the first interstitial hole is positioned at the central authorities of the second stranded mould, first holes around has multiple and to be distributed in outside the first interstitial hole and the first holes around does not communicate with the first interstitial hole, first hole, edge has multiple and is distributed in outside the first center pit and the first hole, edge and does not communicate with the first center pit, and the distance of the first interstitial hole central axis and the first holes around central axis is the 3rd spacing; First spacing > second spacing > the 3rd spacing; The injecting hole of extrusion head is connected with mistake cable core hole; Distance between first stranded mould and the second stranded mould is 1000 ~ 2000mm, distance between second stranded mould and the 3rd stranded mould is 500 ~ 1000mm, and the distance between the first stranded mould and the second stranded mould is 2 ~ 5 times of the distance between the second stranded mould and the 3rd stranded mould;

Certainly, in said method, Loose tube is not limited to three, also can be many; As long as correspondingly increase the coiling dish tool of Loose tube, Fang Guan mechanism, rolling wheels; Light transmitting fiber in Loose tube is also not limited to eight, but is at least one.

The method of the another kind of fabrication layer stranded cables described in embodiment 1, is characterized in that it includes following steps:

3rd step: cable core forming step: (1) get steel wire or fiberglass-reinforced plastic lever to be placed on the reinforcement discharge device of cable-former as reinforcement 3 and pull-out through the first stranded mould 41 the first medium pore 410, then through the second stranded mould 42 the first center pit, after the first interstitial hole of the 3rd stranded mould 43, cross cable core hole 52 again through extrusion head 51 inside; (2) that second step is formed and around the finished product Loose tube 2 on the first dish tool 11 by the first rolling wheels 31 and through the first stranded mould 41 the first edge hole 411, again through the second stranded mould 42 the first hole, edge 421, then through the 3rd stranded mould 43 the first holes around 431, then emptyly cross crossing cable core hole and guaranteeing that finished product Loose tube is positioned at outside reinforcement of extrusion head 51 inside; That second step is formed and around the finished product Loose tube 2 on the second dish tool 12 by the second rolling wheels 32 and through the first stranded mould 41 the first edge hole 411, again through the second stranded mould 42 the first hole, edge 421, then through the 3rd stranded mould 43 the first holes around 431, then emptyly cross crossing cable core hole and guaranteeing that finished product Loose tube is positioned at outside reinforcement of extrusion head 51 inside; That second step is formed and around the finished product Loose tube 2 on the 3rd dish tool 13 by the 3rd rolling wheels 33 and through the first stranded mould 41 the first edge hole 411, again through the second stranded mould 42 the first hole, edge 421, then through the 3rd stranded mould 43 the first holes around 431, then emptyly cross crossing cable core hole and guaranteeing that finished product Loose tube is positioned at outside reinforcement of extrusion head 51 inside; Make that there is between adjacent Loose tube the gap being not more than 0.2mm; (3) reinforcement and the Loose tube of extrusion head was drawn, and make the first stranded mould, the second stranded mould, the 3rd stranded mould keeps motionless, the polypropylene of melting or tygon or polybutylene terephthalate are injected the injecting hole 53 of extrusion head, adopt in the right-hand member exit crossing cable core hole air extractor to make the polypropylene of melting or tygon or polybutylene terephthalate be close to finished product Loose tube outer and enter the fixed bed forming integration in the internal clearance that Loose tube formed; (4) bar getting polypropylene or tygon formation is filled in outside fixed bed and forms packed layer; And then formation cable core; The material of packed layer and the material of fixed bed are not identical;

The method of a kind of fabrication layer stranded cables described in embodiment 2, is characterized in that it includes following steps:

3rd step: cable core forming step: (1) get steel wire or fiberglass-reinforced plastic lever to be placed on the reinforcement discharge device of cable-former as reinforcement and pull-out through the first stranded mould 41 the first medium pore 410, then through the second stranded mould 42 the first center pit, after the first interstitial hole of the 3rd stranded mould 43, cross cable core hole 52 again through extrusion head 51 inside; (2) that second step is formed and around the finished product Loose tube on dish tool by rolling wheels and through the first stranded mould 41 the first edge hole 411, again through the second stranded mould 42 the first hole, edge 421, then through the 3rd stranded mould 43 the first holes around 431, then emptyly cross crossing cable core hole and guaranteeing that finished product Loose tube is positioned at outside reinforcement of extrusion head 51 inside; Make adjacent Loose tube tangent; (3) reinforcement and the Loose tube of extrusion head was drawn, and make the first stranded mould, the second stranded mould, the 3rd stranded mould keeps motionless, the polypropylene of melting or tygon or polybutylene terephthalate are injected the injecting hole 53 of extrusion head, adopt air extractor to make the polypropylene of melting or tygon or polybutylene terephthalate be close to finished product Loose tube in the right-hand member exit crossing cable core hole and form fixed bed outward; And then formation cable core;

The method of the another kind of fabrication layer stranded cables described in embodiment 2, is characterized in that it includes following steps:

3rd step: cable core forming step: (1) get steel wire or fiberglass-reinforced plastic lever to be placed on the reinforcement discharge device of cable-former as reinforcement and pull-out through the first stranded mould 41 the first medium pore 410, then through the second stranded mould 42 the first center pit, after the first interstitial hole of the 3rd stranded mould 43, cross cable core hole 52 again through extrusion head 51 inside; (2) that second step is formed and around the finished product Loose tube on dish tool by rolling wheels and through the first stranded mould 41 the first edge hole 411, again through the second stranded mould 42 the first hole, edge 421, then through the 3rd stranded mould 43 the first holes around 431, then emptyly cross crossing cable core hole and guaranteeing that finished product Loose tube is positioned at outside reinforcement of extrusion head 51 inside; Make that there is between adjacent Loose tube the gap being not more than 0.2mm; (3) reinforcement and the Loose tube of extrusion head was drawn, and make the first stranded mould, the second stranded mould, the 3rd stranded mould keeps motionless, the polypropylene of melting or tygon or polybutylene terephthalate are injected the injecting hole 53 of extrusion head, adopt in the right-hand member exit crossing cable core hole air extractor to make the polypropylene of melting or tygon or polybutylene terephthalate be close to finished product Loose tube outer and enter the fixed bed forming integration in the internal clearance that Loose tube formed; And then formation cable core;

The method of a kind of fabrication layer stranded cables described in embodiment 3, is characterized in that it includes following steps:

3rd step: cable core forming step: (1) get steel wire or fiberglass-reinforced plastic lever to be placed on the reinforcement discharge device of cable-former as reinforcement and pull-out through the first stranded mould 41 the first medium pore 410, then through the second stranded mould 42 the first center pit, after the first interstitial hole of the 3rd stranded mould 43, cross cable core hole 52 again through extrusion head 51 inside; (2) that second step is formed and around the finished product Loose tube on dish tool by rolling wheels and through the first stranded mould 41 the first edge hole 411, again through the second stranded mould 42 the first hole, edge 421, then through the 3rd stranded mould 43 the first holes around 431, then emptyly cross crossing cable core hole and guaranteeing that finished product Loose tube is positioned at outside reinforcement of extrusion head 51 inside; There are many Loose tube and Loose tube is positioned at adjacent position time make adjacent Loose tube tangent; (3) get the gasket for packing that polypropylene or polythene material make, through the first stranded mould 41 the first edge hole 411, again through the second stranded mould 42 the first hole, edge 421, then through the 3rd stranded mould 43 the first holes around 431, then emptyly cross crossing cable core hole and guaranteeing that finished product gasket for packing is positioned at outside reinforcement of extrusion head 51 inside; Have many gasket for packings and gasket for packing is positioned at adjacent position time make adjacent gasket for packing tangent, gasket for packing and adjacent Loose tube tangent; (4) reinforcement of extrusion head, gasket for packing and Loose tube was drawn, and make the first stranded mould, the second stranded mould, the 3rd stranded mould keeps motionless, the polypropylene of melting or tygon or polybutylene terephthalate are injected the injecting hole 53 of extrusion head, adopt air extractor to make the polypropylene of melting or tygon or polybutylene terephthalate be close to finished product Loose tube in the right-hand member exit crossing cable core hole and gasket for packing forms fixed bed outward; And then formation cable core; The quantity of Loose tube and the quantity sum of gasket for packing are not less than 3;

The method of the another kind of fabrication layer stranded cables described in embodiment 3, is characterized in that it includes following steps:

3rd step: cable core forming step: (1) get steel wire or fiberglass-reinforced plastic lever to be placed on the reinforcement discharge device of cable-former as reinforcement and pull-out through the first stranded mould 41 the first medium pore 410, then through the second stranded mould 42 the first center pit, after the first interstitial hole of the 3rd stranded mould 43, cross cable core hole 52 again through extrusion head 51 inside; (2) that second step is formed and around the finished product Loose tube on dish tool by rolling wheels and through the first stranded mould 41 the first edge hole 411, again through the second stranded mould 42 the first hole, edge 421, then through the 3rd stranded mould 43 the first holes around 431, then emptyly cross crossing cable core hole and guaranteeing that finished product Loose tube is positioned at outside reinforcement of extrusion head 51 inside; There are many Loose tube and Loose tube is positioned at adjacent position time, the gap between the Loose tube that adjacent Loose tube is tangent and not adjacent is not more than 0.2mm; (3) get the gasket for packing that polypropylene or polythene material make, through the first stranded mould 41 the first edge hole 411, again through the second stranded mould 42 the first hole, edge 421, then through the 3rd stranded mould 43 the first holes around 431, then emptyly cross crossing cable core hole and guaranteeing that finished product gasket for packing is positioned at outside reinforcement of extrusion head 51 inside; Have many gasket for packings and gasket for packing is positioned at adjacent position time, adjacent gasket for packing is not tangent, and the gap between adjacent gasket for packing is not more than 0.2mm, and the gap between gasket for packing and adjacent Loose tube is not more than 0.2mm; (4) reinforcement of extrusion head, gasket for packing and Loose tube was drawn, and make the first stranded mould, the second stranded mould, the 3rd stranded mould keeps motionless, the polypropylene of melting or tygon or polybutylene terephthalate are injected the injecting hole 53 of extrusion head, adopt air extractor to make the polypropylene of melting or tygon or polybutylene terephthalate be close to finished product Loose tube in the right-hand member exit crossing cable core hole and gasket for packing outer and enter the fixed bed forming integration in the internal clearance that Loose tube formed; And then formation cable core; The quantity of Loose tube and the quantity sum of gasket for packing are not less than 3;

The method of a kind of fabrication layer stranded cables described in embodiment 4, is characterized in that it includes following steps:

4th step: the step forming the first protective seam: get outside the longitudinal cable core being coated on the 3rd step formation of waterstop and form the first protective seam, the overlapping widths of waterstop lap-joint is 2 ~ 4mm;

5th step: the step forming the second protective seam: get outside steel band or longitudinal the first protective seam being coated on the 4th step formation of aluminium strip and form the second protective seam, when the first protective seam diameter is not more than 8.5mm, the overlapping widths of steel band or aluminium strip lap-joint is not less than 20% of the first protective seam diameter; When the first protective seam diameter is greater than 8.5mm, the overlapping widths of steel band or aluminium strip lap-joint is not less than 5mm;

6th step: restrictive coating forming step: low-smoke non-halogen flame-retardant tygon or linear low density polyethylene or Low Density Polyethylene or medium density polyethylene or high density polyethylene are coated on outside the second protective seam that the 5th step formed by sheath extruding machine extrusion molding; form restrictive coating, complete the making of layer-stranding cable.

The method of the another kind of fabrication layer stranded cables described in embodiment 4, is characterized in that it includes following steps:

Compared with the present invention wraps up with traditional employing yarn class, there is speed of production advantage faster, reach the fastest stranding speed of 250m/min, and stranding speed of the prior art only 80m/min; Therefore, the input of electric power and artificial input is obviously saved.

Do the water penetration test of 1000 optical cables equally, the present invention compared with traditional layer-stranding cable, the method test specified by YD/T901-2009, infiltration phenomenon is not had in the present invention, and traditional layer-stranding cable reaches the seepage rate of 10%, therefore, the present invention has better water permeability resistance energy.

The present invention is placed in-50 to+90 DEG C of temperature test chambers and does experiment, and keeps 24 hours with-50 DEG C ,+90 DEG C every temperature spots, and be alternately once a circulation, continuous 300 times, maximum temperature variation additional attenuation value is 0.035dB/km; And layer-stranding cable of the prior art, within the scope of said temperature, 2 circulations have just occurred that temperature variation additional attenuation value is the phenomenon of 0.3dB/km, have impact on normally carrying out of optical communication, through dissecting, having on the Loose tube of many places and occurring pricking trace; Therefore, the present invention has more excellent temperature resistance sex change energy.

In method of the present invention, the distance between the first stranded mould and the second stranded mould is 2 ~ 5 times of the distance between the second stranded mould and the 3rd stranded mould; Ensure that the stability of Loose tube and presumable gasket for packing in cable core in layer-stranding cable, distortion can not be occurred in fixed bed forming process, after forming finished cable, also can keep excellent mechanical property.

In the present invention, length mark can be stamped on fixed bed, the convenient object identified can be reached, meanwhile, the fixed bed of different colours can also be used, reach the object of differentiation.

Or, in the manufacture method of layer-stranding cable described above or layer-stranding cable, described restrictive coating is made up of the raw material of following weight portion: tygon: 65 parts, polypropylene: 6 parts, antioxidant 1010: 2 parts, aluminium hydroxide: 10 parts, HK type antistatic agent: 1 part, ethyl acetate: 3 parts, carbon black: 2 parts, titanium dioxide: 1 part, sodium rice monox: 8 parts, Tissuemat E: 2 parts.Above-mentioned formula has excellent processing characteristics, and when 100m/min process velocity, jacket surface is smooth, rounding, free of pinholes still; After tested, material oxygen index >=41 are the interval of 16 ~ 50KV at space potential after making the thick sheath of 1.6mm, use continuously for a long time through 700 days, sheath have no the vestige of electrocorrosion.

Layer-stranding cable in the present invention have structure simple, be easy to make, more save cost, stable optical performance after the temperature scope that broadens becomes, the machinery and equipment of use is simple, less investment; The main Advantageous Effects such as block-water effect is excellent, cable core length is known.

The present invention is not limited to above-mentioned preferred forms, and should be appreciated that design of the present invention can be implemented to use by other various forms, they drop in protection scope of the present invention equally.

Claims

1. a method for fabrication layer stranded cables, is characterized in that it includes following steps:

2. a method for fabrication layer stranded cables, is characterized in that it includes following steps:

3rd step: cable core forming step: (1) get steel wire or fiberglass-reinforced plastic lever to be placed on the reinforcement discharge device of cable-former as reinforcement and pull-out through the first stranded mould the first medium pore, then through the second stranded mould the first center pit, after the first interstitial hole of the 3rd stranded mould, cross cable core hole again through extrusion head inside; (2) that second step is formed and around the finished product Loose tube on dish tool by rolling wheels and through the first stranded mould the first edge hole, again through the second stranded mould the first hole, edge, then through the 3rd stranded mould the first holes around, then emptyly cross crossing cable core hole and guaranteeing that finished product Loose tube is positioned at outside reinforcement of extrusion head inside; There are many Loose tube and Loose tube is positioned at adjacent position time, the gap between the Loose tube that adjacent Loose tube is tangent and not adjacent is not more than 0.2mm; (3) get the gasket for packing that polypropylene or polythene material make, through the first stranded mould the first edge hole, again through the second stranded mould the first hole, edge, then through the 3rd stranded mould the first holes around, then emptyly cross crossing cable core hole and guaranteeing that finished product gasket for packing is positioned at outside reinforcement of extrusion head inside; Have many gasket for packings and gasket for packing is positioned at adjacent position time, adjacent gasket for packing is not tangent, and the gap between adjacent gasket for packing is not more than 0.2mm, and the gap between gasket for packing and adjacent Loose tube is not more than 0.2mm; (4) reinforcement of extrusion head, gasket for packing and Loose tube was drawn, and make the first stranded mould, the second stranded mould, the 3rd stranded mould keeps motionless, the polypropylene of melting or tygon or polybutylene terephthalate are injected the injecting hole of extrusion head, adopt air extractor to make the polypropylene of melting or tygon or polybutylene terephthalate be close to finished product Loose tube in the right-hand member exit crossing cable core hole and gasket for packing outer and enter the fixed bed forming integration in the internal clearance that Loose tube formed; And then formation cable core; The quantity of Loose tube and the quantity sum of gasket for packing are not less than 3;