阅读说明：本技术 层绞式气吹微缆及其生产设备、加工方法 (Layer-stranded air-blowing micro cable and production equipment and processing method thereof ) 是由 唐海燕 朱卫华 魏成东 任浩 孟涛 于 2020-12-29 设计创作，主要内容包括：本发明公开了一种层绞式气吹微缆及其生产设备、加工方法,所述微缆包括为层绞式的缆芯、包裹于所述缆芯外侧的护套,还包括设置在所述缆芯与护套之间的塑料包套,所述塑料包套包裹在缆芯的外侧,塑料包套用于为缆芯提供保持绞合节距的约束力。所述生产设备和加工方法用于所述微缆的制备。采用本方案提供的层绞式气吹微缆及其生产设备、加工方法,可减小缆芯套管的受压变形,达到利于光纤衰减控制、避免光纤断裂的目的。(The invention discloses a layer-stranded air-blowing micro-cable, production equipment and a processing method thereof. The production equipment and the processing method are used for preparing the micro cable. By adopting the layer stranded air-blown micro cable and the production equipment and the processing method thereof, the pressed deformation of the cable core sleeve can be reduced, and the purposes of facilitating the attenuation control of the optical fiber and avoiding the fracture of the optical fiber are achieved.)

1. Layer-stranded air-blowing micro cable, including for layer-stranded cable core (1), wrap up in sheath (7) in cable core (1) outside, its characterized in that still including setting up plastic sheath (2) between cable core (1) and sheath (7), plastic sheath (2) parcel is in the outside of cable core (1), and plastic sheath (2) are used for providing the confining force who keeps the transposition pitch for cable core (1).

2. Layer stranded air blown micro cable according to claim 1, wherein the wall thickness of the plastic sheath (2) is less than or equal to 0.15 mm.

3. Layer stranded air-blown micro cable according to claim 1, wherein a water blocking yarn (4) is further provided in the plastic sheath (2) in the cavity between the plastic sheath (2) and the cable core (1).

4. Layer stranded air-blown micro cable according to claim 1, wherein a reinforcing core (3) is further arranged in the cable core (1).

5. Layer stranded air-blown micro-cable according to claim 1, wherein the outer side of the sheath (7) is further provided with a cross-bar (5) extending along the length direction of the sheath (7), and the cross-bar (5) is a rib structure on the outer wall of the sheath (7).

6. Layer stranded air-blown micro cable according to claim 5, wherein the number of the cross bars (5) is multiple, and the cross bars (5) are uniformly distributed in the circumferential direction of the sheath (7), and each cross bar (5) is helical.

7. Layer stranded air-blown micro cable production facility, including the stranding transposition head that is used for forming cable core (1), its characterized in that, stranding transposition head position still is provided with plastics blowing machine aircraft nose, plastics blowing machine aircraft nose is used for: and forming a plastic wrap on the cable core (1) output by the cabling twisting head in a blow molding mode to obtain a plastic wrap (2) wrapping the cable core (1), wherein the plastic wrap (2) is used for providing a constraint force for keeping the twisting pitch for the cable core (1).

8. The layer-stranded air-blowing micro cable production equipment according to claim 7, further comprising a cold water tank arranged at the rear side of the cabling twisting head, wherein on a transmission path of the cable core (1), the cable core (1) is output by the cabling twisting head, passes through a plastic blow molding machine head to form a plastic sheath (2), and then is transmitted into the cold water tank;

the cable core (1) output through the cold water tank passes through the drying device to complete surface drying of the plastic sheath (2), and the cable core (1) subjected to surface drying is wound on the take-up device.

9. The layer-stranded air-blowing micro cable production equipment as claimed in claim 7, further comprising a forming device for obtaining an outer sheath (7) of the cable core (1) outside the plastic sheath (2), wherein the forming device comprises a cable core opening (9) for the cable core (1) to pass through and a die cover (10) positioned outside the cable core opening (9); the middle part of the die cover (10) is provided with a central hole, and the die cover also comprises a groove which is arranged on the inner side of the die cover (10) and is connected with the central hole; an extrusion port (8) is defined between the die cover (10) and the cable core port (9), and the extrusion port (8) is used as an extrusion channel of a material for forming the sheath (7): the extrusion channel comprises a circular ring-shaped channel formed by the central hole and a groove-shaped channel formed by the groove; the cable core opening device further comprises a driving device for driving the die cover (10) to rotate around the axis of the cable core opening (9).

10. The layer-stranded air-blown micro-cable processing method comprises a stranding step for forming a cable core (1), and is characterized in that after the stranding step is completed, a plastic sheath (2) wrapping the cable core (1) is obtained on the outer side of the formed cable core (1) in a plastic blow molding mode, and the plastic sheath (2) is used for providing a constraint force for keeping a stranding pitch for the cable core (1).

Technical Field

The invention relates to the technical field of communication, in particular to a layer stranded air-blowing micro cable and production equipment and a processing method thereof.

Background

In recent years, with the rapid development of communication services and new optical cable technologies, the requirements for laying optical cables are increasing. Because the existing pipeline resources are in short supply, the construction efficiency of the traditional laying mode is too low, and the laying process easily influences the service life of the optical cable, so that the air-blowing micro-cable technology plays an important role in the laying process of the optical cable.

The air-blown micro cable is used as an optical cable laying technology, and the structure of the obtained optical cable generally comprises an outer protection tube (a main tube), a micro tube (a sub tube) and a micro cable. In the specific laying technology, the micro-pipe can be blown into the outer protection pipe by using an air compressor and a pressure gas cylinder, and then a certain number of micro-cables can be blown into the micro-pipe under the action of blowing high-pressure gas into the micro-pipe according to specific requirements. Under the action of gas, the micro cable is suspended in the micro pipe and pushed forward by the gas, the micro cable is in a suspended state in the whole laying process, and the friction between the micro cable and the pipeline is greatly reduced; the micro cable is loosely parked in the pipeline and cannot be influenced by excessive external force, so that the capacity of the optical cable in the pipeline can be effectively increased by using the air-blowing micro cable technology to lay the optical cable; and after the pipeline is laid once, the required number of micro cables are blown in flexibly for multiple times as required in the future.

Further optimization of the optical cable preparation technology is undoubtedly significant for promoting development of the optical cable industry.

Disclosure of Invention

Aiming at the technical problems that the further optimization of the preparation technology of the optical cable is provided and the development of the optical cable industry is promoted, the invention provides the layer stranded air-blown micro cable, the production equipment and the processing method thereof.

The layer-stranded air-blown micro-cable comprises a layer-stranded cable core, a sheath wrapped on the outer side of the cable core, and a plastic sheath arranged between the cable core and the sheath, wherein the plastic sheath is wrapped on the outer side of the cable core and is used for providing a constraint force for keeping the stranding pitch for the cable core.

In the prior art, a layer stranded micro cable is generally stranded by SZ, and then two yarns made of a polymer material are wound and bundled, and are crossly wound outside a sleeve (loose sleeve) to fix the SZ stranding pitch of the sleeve. During the sheath process, a layer of plastic sheath is extruded on the cable core, and the polymer yarn is heated when contacting the high-temperature sheath, so that the yarn can shrink. At low temperatures, the polymer material in the cable also shrinks. Over time, the yarn also has a tendency to retract. The shrinkage and retraction proposed above will cause the tension of the yarn to increase and tighten the sleeve, while the sleeve of the micro cable is thinner and the thickness of the sleeve wall is thin, and as the tension of the yarn increases, the sleeve is easily deformed by the yarn, and in severe cases, the attenuation of the optical fiber will increase, even the fiber will be broken.

Aiming at the problems, the scheme provides a novel micro cable structure. In this scheme, the cable core can adopt if keep flat by the yarn that blocks water and add the fixed form of the direct parcel of plastic wrap, if the upper strata hank formula is the SZ transposition, so the structure that this scheme provided need not be through tying the yarn (if adopt the SZ transposition) fixed cable core of mode alternately binding, can effectively avoid tying the yarn to bind (if adopt the SZ transposition) fixed certain tension that exists, tie up behind the yarn sheath and tighten the cable core further after the long-term shrink in addition, lead to cable core sleeve pipe pressurized deformation, and then lead to the optical attenuation to exceed standard or even break: the plastic sheath is obtained by a blow molding plastic wrapping mode to replace yarn binding SZ stranding in the prior art, yarn binding can be eliminated, tightening pressure of yarn subjected to SZ stranding under the influence of heat and cold in the forming process and the later stage of the sheath on the sleeve is avoided, and the sleeve cannot deform in the preparation and use processes of the micro cable.

In the upper limit, by defining as: the plastic sheath is used for providing a constraining force for the cable core to keep the twisting pitch, and actually, the matching relation between the plastic sheath and the cable core is limited, so that the constraining effect on the cable core before the sheath is not obtained in the manufacturing process of forming the micro cable by the plastic sheath is achieved.

The layer-stranded air-blown micro cable comprises the following further technical scheme:

as a technical scheme for forming effective stranding pitch constraint for cable cores, simultaneously facilitating obtaining the plastic sheath in a blow molding mode, enabling the plastic sheath to be rapidly cooled and obtaining corresponding stranding pitch constraint force in time, the method is characterized in that: the wall thickness of the plastic sheath is less than or equal to 0.15 mm.

For forming cable core cable paste protection, the following settings are set: filling cable paste in the cable core; for forming the cable core and having longitudinal water resistance, the cable core is arranged as follows: and water-blocking yarns are also arranged in the cavity gap between the plastic sheath and the cable core in the plastic sheath.

As a cable core with intensity protect function, set up to: and a reinforcing core is also arranged in the cable core. The reinforced core can adopt FRP, high-strength phosphated steel wire and the like.

In the prior art, the air-blowing micro cable is mature in application and has a plurality of advantages compared with the traditional micro cable laying. For air blown micro cables, the most important metrics are air blowing speed and air blowing distance. The friction between the outer sheath of the micro cable and the micro tube and the duty ratio of the micro cable in the micro tube are important factors influencing the laying efficiency of the air-blowing micro cable. The magnitude of the friction force depends on the contact area and the friction coefficient, the external force transmitted into the gas is reduced due to the overlarge friction force, and even the friction force and the external force of the gas are mutually offset seriously, so that the micro cable cannot be continuously pushed in the micro tube; the duty ratio of the micro cable is too large, which can cause the air flow speed to be reduced and is not beneficial to laying the micro cable. To above problem, this scheme has adjusted the appearance of sheath, and is concrete, sets up to: the outside of sheath still is provided with the horizontal bar that extends along sheath length direction, the horizontal bar is the arris strip structure on the sheath outer wall. This scheme of adoption, above horizontal bar forms the border in the sheath outside, and when the air-blowing micro-cable was used, the tip through the horizontal bar formed the support to the micro-cable, through reducing area of contact reach the purpose that frictional force was big or small when reducing the air-blowing micro-cable and using, is convenient for realize that the micro-cable lays.

For obtaining more ideal duty cycle and more even air current distribution to do benefit to and carry out the air-blowing micro cable, make the force that compressed gas acted on the horizontal bar can directly promote the micro cable to advance when carrying out the air-blowing micro cable simultaneously, set up to: the quantity of horizontal bar is many, and horizontal bar is at the circumference direction evenly distributed of sheath, and each horizontal bar all is the heliciform.

This scheme still discloses a layer stranded formula air-blowing micro cable production facility, including the stranding transposition head that is used for forming the cable core, the stranding transposition head position still is provided with plastics blowing machine aircraft nose, plastics blowing machine aircraft nose is used for: and forming plastic wrapping on the cable core output by the cabling twisting head in a blow molding manner to obtain a plastic wrapping for wrapping the cable core, wherein the plastic wrapping is used for providing a constraint force for keeping the twisting pitch for the cable core. This scheme provides a production facility that can make above-mentioned rail that proposes, is different from prior art, forms the yarn that fungible like SZ transposition pitch keeps on its surface after accomplishing the cable core transposition, through avoiding adopting with last yarn, reaches the protection cable core and receives extruded purpose.

The layer-stranded air-blowing micro cable production equipment adopts the further technical scheme that:

more completely, the setting is as follows: the device also comprises a cold water tank arranged at the rear side of the cabling twisting head, wherein on the transmission path of the cable core, the cable core is output by the cabling twisting head, passes through a plastic blow molding machine head to form a plastic sheath, and is then transmitted into the cold water tank;

the cable core output through the cold water tank passes through the drying device to complete surface drying of the plastic sheath, and the cable core subjected to surface drying is wound on the take-up device. In this scheme, get into the cooling water tank cooling behind the cable core parcel plastic sheath for the plastic sheath rapid cooling reaches the purpose that can retrain the cable core, then adopts take-up to accomodate after drying device is dry, and follow-up take-up has the cable core that the cladding has the plastic sheath on it according to sheath preparation technology, can obtain the product micro cable including outer sheath. Preferably, in order to protect the cable core and simultaneously facilitate the take-up quality, an anti-twisting device for realizing the anti-twisting protection of the cable core is arranged between the drying device and the take-up device.

In order to obtain the spiral transverse bar, so that the power from the air can directly provide the advancing power for the air blowing laying of the micro cable under the action of the compressed air, the spiral transverse bar is arranged as follows: the forming device comprises a cable core opening for the cable core to pass through and a die cover positioned outside the cable core opening; the middle part of the die cover is provided with a central hole, and the die cover also comprises a groove which is arranged on the inner side of the die cover and is connected with the central hole; an extrusion port is defined between the die cover and the cable core port, and the extrusion port is used as an extrusion channel for forming the material of the sheath: the extrusion channel comprises a circular ring-shaped channel formed by the central hole and a groove-shaped channel formed by the groove; the cable core port mould cover further comprises a driving and rotating device used for driving the mould cover to rotate around the axis of the cable core port. In this scheme, a material for forming the sheath by extrude the passageway and extrude, the cable core that the cladding has the plastics canning is drawn forth by the cable core mouth, like this, can form the part of relevant position sheath at cable core circumference direction each point, the recess is used for forming the horizontal bar is under the effect of driving the device, and is rotatory through the mould lid, can form the spiral horizontal bar around the cable core.

The scheme also discloses a layer-stranded air-blowing micro-cable processing method which comprises a stranding step for forming the cable core, wherein after the stranding step is completed, a plastic sheath for wrapping the cable core is obtained on the outer side of the formed cable core in a plastic blow molding mode, and the plastic sheath is used for providing a constraint force for keeping the stranding pitch for the cable core. The method is the processing method of the micro cable, and by adopting the method, after the cable core finishes stranding, the plastic sheath is used for restraining the stranding pitch, so that the problem of sleeve tightening pressure caused by yarn SZ stranding can be avoided. As described above. The stranding step preferably adopts SZ stranding.

As a person skilled in the art, the plastic sheath provided by the scheme is different from an outer sheath on a traditional cable core, and the traditional outer sheath is thick, so that the sheath per se has poor heat dissipation in the preparation process according to the existing preparation process, and the cooling process of the traditional sheath cannot achieve the purpose of constraint of the plastic sheath in the scheme in consideration of the control of the stranding pitch of the cable core. Even though the sheath and the plastic sheath are the plastic layers outside the cable core, the sheath and the plastic sheath are actually plastic layers with different functions: the plastic sheath is used for stranding pitch constraint, and the sheath is an outer protective layer. Considering the specific constraint of the protection purpose, the plastic sheath and the sheath have different thicknesses: the plastic sheath is thin, for example, the wall thickness is 0.1mm, so that the corresponding strength can be quickly obtained in a heat dissipation mode in the forming process; the sheath is relatively thick, e.g. 1mm, to obtain sufficient outer layer protection.

The invention has the following beneficial effects:

in the scheme, a novel micro cable structure form, production equipment with novel structural relation and a corresponding processing method are provided. Technical scheme that this scheme of adoption provided, the cable core can adopt if keep flat by the yarn that blocks water and add the fixed form of the direct parcel of plastic wrap, if be the SZ transposition for the upper strata hank formula, so the structure that this scheme provided need not be through tying the fixed cable core of the mode that the yarn (if adopt the SZ transposition) alternately binded, can effectively avoid tying the yarn to bind (if adopt the SZ transposition) fixed certain tension that exists, tie behind the yarn sheath and further tighten the cable core after the long-term shrink in addition, lead to cable core sleeve pipe compressive deformation, and then cause the optic fibre decay to exceed standard or even fracture: the plastic sheath is obtained by a blow molding plastic wrapping mode to replace yarn binding SZ stranding in the prior art, yarn binding can be eliminated, tightening pressure of yarn subjected to SZ stranding under the influence of heat and cold in the forming process and the later stage of the sheath on the sleeve is avoided, and the sleeve cannot deform in the preparation and use processes of the micro cable. The corresponding production equipment and the corresponding processing method are used for preparing the micro cable in the above form.

Drawings

Fig. 1 is a schematic structural view of an embodiment of the micro-cable according to the invention, in cross section, particularly for showing the embodiment in which the crossbars extend parallel to the direction of extension of the cable core;

FIG. 2 is a schematic structural view of one embodiment of the micro-cable of the present invention, which is a cross-sectional view, particularly illustrating the implementation of the cross-bars extending helically along the extension direction of the cable core;

FIG. 3 is a side view of the structure shown in FIG. 2;

FIG. 4 is a schematic view of the configuration of the end of the micro-cable manufacturing apparatus for obtaining a corresponding sheath, matched to the configuration of FIG. 1;

fig. 5 is a schematic view of the structure of the end of the micro-cable production device for obtaining a corresponding sheath, matching the structure shown in fig. 2.

The reference numbers in the figures are in order: 1. the cable comprises a cable core, 2, a plastic sheath, 3, a reinforcing core, 4, water-blocking yarns, 5, crossbands, 6, cable paste, 7, a sheath, 8, an extrusion port, 9, a cable core port, 10 and a mold cover.

Detailed Description

The present invention will be described in further detail with reference to examples, but the structure of the present invention is not limited to the following examples.

Example 1:

as shown in fig. 1 to 3, the layer-stranded air-blown micro cable includes a layer-stranded cable core 1, a sheath 7 wrapped outside the cable core 1, and a plastic sheath 2 disposed between the cable core 1 and the sheath 7, wherein the plastic sheath 2 is wrapped outside the cable core 1, and the plastic sheath 2 is used for providing a constraining force for the cable core 1 to maintain a twisting pitch.

In the prior art, a layer stranded micro cable is generally stranded by SZ, and then two yarns made of a polymer material are wound and bundled, and are crossly wound outside a sleeve (loose sleeve) to fix the SZ stranding pitch of the sleeve. During 7 processes of the sheath, a layer of plastic sheath 7 is extruded on the cable core 1, and the polymer yarn is heated when contacting the high-temperature sheath 7, so that the yarn can shrink. At low temperatures, the polymer material in the cable also shrinks. Over time, the yarn also has a tendency to retract. The shrinkage and retraction proposed above will cause the tension of the yarn to increase and tighten the sleeve, while the sleeve of the micro cable is thinner and the thickness of the sleeve wall is thin, and as the tension of the yarn increases, the sleeve is easily deformed by the yarn, and in severe cases, the attenuation of the optical fiber will increase, even the fiber will be broken.

Aiming at the problems, the scheme provides a novel micro cable structure. In this scheme, cable core 1 can adopt if keep flat by the yarn that blocks water and add the fixed form of the direct parcel of plastic wrap 2, if the upper strata hank formula is the SZ transposition, so the structure that this scheme provided need not block water the yarn (if adopt the SZ transposition) fixed cable core 1 of mode alternately binding through pricking the yarn, can effectively avoid pricking the yarn to bind (if adopt the SZ transposition) fixed certain tension that exists, it further tightens cable core 1 to tie behind 7 and the long-term shrink of yarn sheath in addition, lead to 1 sleeve pipe of cable core pressurized deformation, and then cause the optical attenuation to exceed standard or even fracture: the plastic sheath 2 is obtained by a blow molding plastic wrapping mode to replace the yarn binding SZ stranding in the prior art, the yarn binding can be eliminated, the tightening pressure of the yarn binding to the sleeve, which is affected by heat and cold in the forming process and the later stage of the sheath 7, is avoided, and the sleeve cannot deform in the micro-cable preparation and use processes.

In the upper limit, by defining as: the plastic sheath 2 is used for providing a constraining force for the cable core 1 to keep the twisting pitch, and in fact, the matching relation between the plastic sheath 2 and the cable core 1 is limited, so that the plastic sheath 2 can form a micro cable in the manufacturing process and the constraining effect on the cable core 1 before the sheath 7 is obtained is achieved.

Example 2:

this example is further defined on the basis of example 1:

as a technical scheme for forming effective stranding pitch constraint for the cable core 1, simultaneously facilitating obtaining the plastic sheath 2 by means of blow molding, enabling the plastic sheath 2 to be rapidly cooled and obtaining corresponding stranding pitch constraint force, the method is characterized in that: the wall thickness of the plastic sheath 2 is less than or equal to 0.15 mm.

Example 3:

this example is further defined on the basis of example 1:

in order to form the protection of the cable core 1 and the cable paste 6, the following steps are set: and a water-blocking yarn 4 is also arranged in the cavity gap between the plastic sheath 2 and the cable core 1 in the plastic sheath 2.

As a cable core 1 with strength protect function, set up to: the cable core 1 is also provided with a reinforced core 3. The reinforced core 3 can adopt FRP, high-strength phosphated steel wire and the like.

Example 4:

this example is further defined on the basis of example 1:

in the prior art, the air-blowing micro cable is mature in application and has a plurality of advantages compared with the traditional micro cable laying. For air blown micro cables, the most important metrics are air blowing speed and air blowing distance. The friction between the micro cable outer sheath 7 and the micro tube and the duty ratio of the micro cable in the micro tube are important factors influencing the laying efficiency of the air-blowing micro cable. The magnitude of the friction force depends on the contact area and the friction coefficient, the external force transmitted into the gas is reduced due to the overlarge friction force, and even the friction force and the external force of the gas are mutually offset seriously, so that the micro cable cannot be continuously pushed in the micro tube; the duty ratio of the micro cable is too large, which can cause the air flow speed to be reduced and is not beneficial to laying the micro cable. To above problem, this scheme has adjusted the appearance of sheath 7, and is concrete, sets up to: the outer side of the sheath 7 is further provided with a cross bar 5 extending along the length direction of the sheath 7, and the cross bar 5 is of a rib structure on the outer wall of the sheath 7. This scheme of adoption, above horizontal bar 5 forms the boundary in sheath 7 the outside, and when the air-blowing micro-cable was used, the tip through horizontal bar 5 formed the support to the micro-cable, reached the purpose that frictional force was big or small when reducing the air-blowing micro-cable and using through reducing area of contact, was convenient for realize that the micro-cable lays.

Example 5:

this example is further defined on the basis of example 4:

in order to obtain more ideal duty cycle and more even air current distribution to do benefit to and carry out the air-blowing micro cable, make the force that compressed gas acted on horizontal bar 5 can directly promote the micro cable to advance when carrying out the air-blowing micro cable simultaneously, set up as: the number of the transverse strips 5 is multiple, the transverse strips 5 are uniformly distributed in the circumferential direction of the sheath 7, and each transverse strip 5 is spiral.

Example 6:

the embodiment provides a layer stranded air-blowing micro cable production facility, including the stranding transposition head that is used for forming cable core 1, the stranding transposition head position still is provided with plastics blowing machine aircraft nose, plastics blowing machine aircraft nose is used for: and forming plastic wrap on the cable core 1 output by the cabling twisting head in a blow molding mode to obtain a plastic wrap 2 wrapping the cable core 1, wherein the plastic wrap 2 is used for providing a constraint force for keeping the twisting pitch for the cable core 1. This scheme provides a production facility that can make above proposed rail, is different from prior art, forms the yarn that fungible if SZ transposition pitch keeps on its surface after accomplishing cable core 1 transposition, through avoiding adopting with last yarn, reaches protection cable core 1 and receives extruded purpose.

Example 7:

this example is further defined on the basis of example 6:

more completely, the setting is as follows: the device also comprises a cold water tank arranged at the rear side of the cabling twisting head, wherein on the transmission path of the cable core 1, the cable core 1 is output by the cabling twisting head, passes through a plastic blow molding machine head to form a plastic sheath 2 and then is transmitted into the cold water tank;

the cable core 1 output through the cold water tank passes through the drying device to complete surface drying of the plastic sheath 2, and the cable core 1 subjected to surface drying is wound on the take-up device. In this scheme, the cooling water tank cooling is gone into behind cable core 1 parcel plastic sheath 2 for plastic sheath 2 rapid cooling reaches the purpose that can retrain cable core 1, then adopts take-up to accomodate through drying device drying back, and follow-up take-up has cable core 1 that plastic sheath 2 wrapped up on it according to sheath 7 preparation technology, the release, can obtain the product micro cable including outer sheath 7.

Example 8:

this example is further defined on the basis of example 6:

in order to obtain the transverse bar 5 which is spiral as described above, so that the power from the air under the action of the compressed air can directly provide the forward power for the air blowing laying of the micro cable, the following steps are provided: the forming device is used for obtaining an outer sheath 7 of the cable core 1 outside the plastic sheath 2, and comprises a cable core opening 9 for the cable core 1 to pass through and a die cover 10 positioned outside the cable core opening 9; the middle part of the die cover 10 is provided with a central hole, and the die cover also comprises a groove which is arranged on the inner side of the die cover 10 and is connected with the central hole; an extrusion port 8 is defined between the die cover 10 and the cable core port 9, and the extrusion port 8 is used as an extrusion channel for a material forming the sheath 7: the extrusion channel comprises a circular ring-shaped channel formed by the central hole and a groove-shaped channel formed by the groove; and the device also comprises a driving device for driving the die cover 10 to rotate around the axis of the cable port 9. In this scheme, be used for forming sheath 7 the material by extrude the passageway and extrude, the cable core 1 that the cladding has plastic sheath 2 is drawn forth by cable core mouth 9, like this, can form the local of relevant position sheath 7 at 1 circumference direction each point of cable core, the recess is used for forming horizontal bar 5 under the effect of driving the device that changes, rotates through mould lid 10, can form spiral horizontal bar 5 around cable core 1.

Example 9:

the embodiment provides a layer-stranded air-blowing micro-cable processing method, which comprises a stranding step for forming a cable core 1, wherein after the stranding step is completed, a plastic sheath 2 wrapping the cable core 1 is obtained on the outer side of the formed cable core 1 in a plastic blow molding mode, and the plastic sheath 2 is used for providing a constraint force for keeping a stranding pitch for the cable core 1. The method is the processing method of the micro cable, and by adopting the method, after the cable core 1 finishes stranding, the plastic sheath 2 is used for restraining the stranding pitch, so that the problem of sleeve tightening pressure caused by yarn SZ stranding can be avoided.

Example 10:

taking the structure provided in fig. 1 as an example, this embodiment provides a specific implementation manner on the basis of embodiment 9:

the micro cable provided in fig. 1 is formed by twisting 1 central reinforcing core 3 (optional FRP or high-strength phosphated steel wire) and 4 sleeves SZ outside the central reinforcing core 3;

1-2 water-blocking yarns 4 are vertically placed in an outer gap between a central reinforcing core 3 and a sleeve, and factice is filled in the sleeve;

the stranding twisting head and a blow molding machine head are designed into a whole, a central reinforcing core 3 is led out from a central hole of the stranding head, a sleeve comes out from holes around the central hole and rotates along with the stranding head SZ, a cable core 1 is stranded and molded at the position of the stranding head through the SZ, and meanwhile, the cable core 1 comes out from the stranding head and is coated with a layer of plastic with the thickness of 0.1mm on the surface in a blow molding mode to obtain a plastic sheath 2, and then the plastic sheath is cooled by a water tank and dried and collected on a take-up stand of a stranding production line;

finally, a layer of special-shaped structure sheath 7 which is shown in figure 1 and comprises the transverse strips 5 is sleeved on the sheath 7 in the process step to be used as an outer protective layer of the cable core 1;

compared with the prior art, the technology has the advantages that:

the cable core 1 is directly wrapped and fixed by the water-blocking yarns 4 in a flat mode and plastic, and the cable core 1 is not fixed in a mode of cross binding through yarns (such as SZ stranding). The SZ twisting fixation has certain tension, and the cable core 1 is tightened further after the cable core is bundled by the yarn sheath 7 and is contracted for a long time, so that the sleeve of the cable core 1 is pressed and deformed, further the optical fiber attenuation exceeds the standard and even is broken, the yarn bundling can be eliminated by a blow molding plastic wrapping mode, the tightening pressure on the sleeve is avoided, and the sleeve cannot be deformed.

The air-blowing micro cable with the structure adopts the outer sheath 7 with the special-shaped structure. By adopting the structure, the contact area of the micro cable and the conveying gas can be increased in the air blowing process, the air blowing distance is increased, and the contact area of the micro cable and the inner wall of the micro tube can be reduced, so that the influence caused by friction is reduced.

Example 11:

taking the structure provided in fig. 2 and 3 as an example: the micro cable provided by the structure is formed by twisting 6 sleeves SZ outside a central reinforced core 3 by 1 central reinforced core 3 (optional FRP or high-strength phosphatized steel wire);

1-2 water-blocking yarns 4 are vertically placed in an outer gap between a central reinforcing core 3 and a sleeve, and factice is filled in the sleeve;

the stranding twisting head and the blow molding machine head are designed into a whole, the central reinforcing core 3 comes out from a central hole of the twisting head, the sleeve comes out from holes around the central hole and rotates along with the twisting head SZ, the cable core 1 is twisted and molded at the twisting head by the SZ, and meanwhile, the cable core 1 comes out from the twisting head and is wrapped with a layer of plastic with the thickness of 0.1mm on the surface in a blow molding mode, cooled by a water tank and dried, and then is collected on a take-up stand of a stranding production line;

and finally, a layer of specially-shaped outer protective layer is sleeved on the process of the sheath 7, and the special-shaped outer protective layer is characterized in that the shape is spiral. The spiral cross-bar 5 is made in the following way:

firstly, the mould core is not different from the common layer-stranded mould core, the opening part of the mould cover 10 is the same as the cable section and is similar to a tooth-shaped opening, a runner for material flow is arranged between the mould core and the mould cover 10, and the speed of the motor driving the mould cover 10 to rotate is controlled along with the traction speed in the starting-up process, so that a spiral groove with stable pitch is formed.

Compared with the prior art, the technology has the advantages that:

the cable core 1 is directly wrapped and fixed by the water-blocking yarns 4 in a flat mode and plastic, and the cable core 1 is not fixed in a mode of cross binding through yarns (such as SZ stranding). The SZ twisting fixation has certain tension, and the cable core 1 is tightened further after the cable core is bundled by the yarn sheath 7 and is contracted for a long time, so that the sleeve of the cable core 1 is pressed and deformed, further the optical fiber attenuation exceeds the standard and even is broken, the yarn bundling can be eliminated by a blow molding plastic wrapping mode, the tightening pressure on the sleeve is avoided, and the sleeve cannot be deformed.

The air-blowing micro cable adopts an outer sheath 7 with a special-shaped spiral groove structure. By adopting the structure, the duty ratio of the micro cable in the micro pipe can be effectively reduced in the air blowing process, the contact area of the micro cable and gas is increased, and the contact area of the micro cable and the micro pipe is reduced, so that the influence caused by friction is reduced. Meanwhile, due to the spiral groove, the air blowing distance can be increased.

With regard to the description applicable to the above embodiments: as a person skilled in the art, the plastic sheath 2 provided by the scheme is different from the outer sheath 7 on the traditional cable core 1, and because the traditional outer sheath 7 is thick, according to the existing preparation process, in the preparation process, the heat dissipation of the sheath 7 is poor, and considering the control of the twisting pitch of the cable core 1, the cooling process of the traditional sheath 7 cannot achieve the constraint purpose of the plastic sheath 2 in the scheme. Therefore, even though the sheath 7 and the plastic sheath 2 are both plastic layers outside the cable core 1, the plastic layers are actually plastic layers with different functions: the plastic sheath 2 is used for stranding pitch constraint, and the sheath 7 is an outer protective layer. Considering the specific constraint of the protection purpose, the plastic sheath 2 and the sheath 7 have different thicknesses: the plastic sheath 2 is thin, for example, the wall thickness is 0.1mm, so that the corresponding strength can be quickly obtained in a heat dissipation mode in the forming process; the sheath 7 is relatively thick, e.g. 1mm, to obtain sufficient outer layer protection.

The foregoing is a more detailed description of the present invention in connection with specific preferred embodiments thereof, and it is not intended that the specific embodiments of the present invention be limited to these descriptions. For those skilled in the art to which the invention pertains, other embodiments that do not depart from the gist of the invention are intended to be within the scope of the invention.