CN114002792B

CN114002792B - Optical cable and metal belt longitudinal packing device thereof

Info

Publication number: CN114002792B
Application number: CN202111193739.5A
Authority: CN
Inventors: 孙宏伟; 刘本章; 潘强斌
Original assignee: Fiberhome Telecommunication Technologies Co Ltd
Current assignee: Fiberhome Telecommunication Technologies Co Ltd
Priority date: 2021-10-13
Filing date: 2021-10-13
Publication date: 2023-10-13
Anticipated expiration: 2041-10-13
Also published as: CN114002792A

Abstract

The application relates to the technical field of optical fibers, in particular to an optical cable and a metal belt longitudinal wrapping device thereof. The optical cable includes: the fiber core assembly, the metal belt and the outer sheath are coated on the outer side of the fiber core assembly, the inner folding parts and the outer folding parts are arranged at the two ends of the metal belt, the inner folding parts are folded towards the fiber core assembly, the outer folding parts are folded back to the fiber core assembly, and the inner folding parts and the outer folding parts of the metal belt are mutually clamped; the outer sheath is coated on the outer side of the metal belt. The optical cable metal belt longitudinal packing device comprises: the bending part forming mechanism enables the two ends of the metal belt to form an inner bending part which is folded towards the fiber core component and an outer bending part which is folded back towards the fiber core component; the gathering and forming mechanism enables the metal belt to form an arc shape and gathers the inner folding part and the outer folding part; the bending part clamping mechanism enables the inner bending part and the outer bending part to be clamped with each other; the sizing forming mechanism compresses and forms the inner folding part and the outer folding part. The problem that the outer sheath cracks due to the fact that the metal bands are staggered to form the shearing of the outer sheath due to repeated torsion of the optical cable in the prior art can be solved.

Description

Optical cable and metal belt longitudinal packing device thereof

Technical Field

The application relates to the technical field of optical fibers, in particular to an optical cable and a metal belt longitudinal wrapping device thereof.

Background

The advent of the 5G age has brought rapid developments in optical communications technology, and modern communications networks cover the whole earth. Optical fiber cables are also being increasingly upgraded in terms of their manufacturing technology as the only and important optical signal transmission medium.

In order to protect the optical fiber from external torsion and lateral pressure, and ensure that the optical fiber has a long-term communication function, an armor layer formed by longitudinally wrapping a metal belt is generally added between the optical fiber and a protective layer in the preparation of the optical cable, and in the existing metal belt forming process, the edges of the metal belt are overlapped together in the longitudinal wrapping forming process to form an upper lap joint and a lower lap joint.

However, because the metal belt, particularly the steel belt and the stainless steel belt, has larger hardness and yield strength, when the metal belt is subjected to torsion force, the movement trend of the joint edge on the metal belt with larger hardness is to directly cut relatively fragile PE, and the metal belt at the joint of the steel-plastic composite belt is dislocated with each other due to excessive repeated torsion times in the construction process of the optical cable, so that repeated shearing force on PE is formed, and the outer sheath at the joint is easy to crack.

Disclosure of Invention

Aiming at the defects in the prior art, the application aims to provide an optical cable and a metal belt longitudinal packing device thereof, which can solve the problems that the overlapping part of the steel-plastic composite belt is mutually misplaced due to excessive repeated torsion times in the construction process of the optical cable in the prior art, and the repeated shearing force on the PE outer sheath is formed, so that the outer sheath at the overlapping part is cracked.

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

in one aspect, the present application provides an optical cable comprising:

a core assembly;

the metal belt is coated on the outer side of the fiber core assembly, the two ends of the metal belt are provided with an inner folded part and an outer folded part, the inner folded part is folded towards the fiber core assembly, the outer folded part is folded back to the fiber core assembly, and the inner folded part and the outer folded part of the metal belt are mutually clamped;

and the outer sheath is coated outside the metal belt.

In some alternatives, the inner and outer folds are each provided with corrugations extending axially along the core assembly.

In some alternative solutions, the overlapping portion of the clamped inner folded portion and the clamped outer folded portion is 1.5-2.5mm.

In another aspect, the present application also provides a longitudinal packing device for a metal tape of an optical cable, comprising:

a bending part forming mechanism for forming an inner bending part which is folded towards the fiber core assembly and an outer bending part which is folded back towards the fiber core assembly at two ends of the metal belt;

a gathering and forming mechanism for forming the folded metal strip into an arc shape and gathering the inner folded portion and the outer folded portion with each other;

the bending part clamping mechanism is used for clamping the inner bending part and the outer bending part after being gathered mutually;

the sizing forming mechanism is used for compacting and forming the inner folded part and the outer folded part which are clamped with each other.

In some alternative solutions, the bending part forming mechanism includes a bending forming plate, on which a narrow slit is provided, the width of the narrow slit is smaller than the width of the metal strip, and two ends of the narrow slit are respectively provided with a crease that bends towards two sides of the narrow slit, so that after the metal strip passes through the narrow slit and the crease, an inner crease and an outer crease are formed at two ends of the metal strip.

In some alternatives, the gathering and shaping mechanism includes:

the first gathering assembly comprises a first concave cambered surface roller and a first convex cambered surface roller which are arranged on two sides of the metal belt and are matched with each other, so that the metal belt forms an arc shape after passing through the belt;

the forming assembly comprises a first semicircular arc concave roller and a second semicircular arc concave roller which are matched with each other, and the first semicircular arc concave roller and the second semicircular arc concave roller are respectively arranged on two sides of the metal belt in an arc shape, so that the rear two ends of the metal belt in the arc shape are gathered into a circle.

In some optional schemes, the gathering and forming mechanism further comprises a second gathering component, the second gathering component is arranged between the first gathering component and the forming component, and the second gathering component comprises a second concave arc surface roller and a second convex arc surface roller which are arranged on two sides of the metal belt and are matched with each other, so that the radian of the metal belt in an arc shape is increased.

In some alternative schemes, the bending part clamping mechanism comprises a clamping template, a clamping through hole is formed in the clamping template, a metal belt penetrates through the clamping through hole after the inner folding part and the outer folding part are gathered with each other, a pressing part and a containing groove are formed in the clamping through hole, the pressing part is located below the containing groove, the containing groove is used for containing the inner folding part, and the pressing part is used for being arranged on the inner side of the outer folding part to press and hold the metal belt to drive the outer folding part to be clamped with the inner folding part.

In some optional schemes, the sizing forming mechanism comprises a rolling sizing assembly, the rolling sizing assembly comprises a third semicircular arc concave roller and a fourth semicircular arc concave roller which are arranged on two sides of the metal belt, the third semicircular arc concave roller and the fourth semicircular arc concave roller are mutually matched to form a circular through hole, and the metal belt after the outer folding part and the inner folding part are clamped is subjected to sizing forming after passing through the circular through hole.

In some optional schemes, the sizing forming mechanism further comprises a sliding sizing template, wherein the sliding sizing template is arranged between the bending part clamping mechanism and the rolling sizing assembly, sizing holes for allowing the metal belt to pass through are formed in the sliding sizing template, and the sizing holes are used for compacting the mutual clamping state between the inner bending part and the outer bending part.

Compared with the prior art, the application has the advantages that: because the inner fold portion of the metal belt is folded towards the fiber core assembly, the outer fold portion is folded back to the fiber core assembly, the inner fold portion and the outer fold portion are clamped together, the lap joint portions of two ends of the metal belt are hidden at the inner side of the metal belt, the sharp lap joint edges of the metal belt are not directly contacted with the fiber core assembly or contacted with the outer sheath, when the optical cable is subjected to torsion, the position of the outer sheath, which is relatively fragile, is the folded position of the inner fold portion of the metal belt, the end portion of the metal belt cannot directly cut the outer sheath, the cutting of the metal belt to the outer sheath in the long-term use environment process is avoided, and the service life of the optical cable is prolonged. And moreover, the optical cable metal belt can realize automatic longitudinal wrapping of the metal belt, and the structure is simple and efficient.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for the description of the embodiments will be briefly described below, and it is apparent that the drawings in the following description are only some embodiments of the present application, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

FIG. 1 is a schematic diagram of an optical cable according to an embodiment of the present application;

FIG. 2 is a schematic view of an inner fold and an outer fold in an embodiment of the present application;

FIG. 3 is a schematic view of a longitudinal wrapping apparatus for a metal strip according to an embodiment of the present application;

fig. 4 is a schematic view of a bending part clamping mechanism in an embodiment of the application.

In the figure: 1. a core assembly; 11. a central reinforcement; 12. an optical fiber; 2. a metal belt; 21. an inward folded part; 22. an outward folding part; 3. an outer sheath; 4. a bending part forming mechanism; 41. bending to form a plate; 411. a narrow slit; 412. crease; 5. a gathering and forming mechanism; 51. a first gathering component; 511. a first concave arc surface roller; 512. a first convex arc surface roller; 52. a second gathering assembly; 521. a second concave arc surface roller; 522. a second convex arc surface roller; 53. a forming assembly; 531. a first semicircular concave roller; 532. a second semi-circular arc concave roller; 54. bending and shaping plates; 6. a bending part clamping mechanism; 61. clamping the through hole; 62. a pressing part; 63. a receiving groove; 7. sizing and forming mechanism; 71. a rolling sizing assembly; 711. a third semi-circular arc concave roller; 712. a fourth semi-circular arc concave roller; 72. sliding the sizing template; 81. a substrate; 82. a side plate; 83. and a fixed shaft.

Detailed Description

For the purpose of making the objects, technical solutions and advantages of the embodiments of the present application more apparent, the technical solutions of the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application, and it is apparent that the described embodiments are some embodiments of the present application, but not all embodiments of the present application. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.

Embodiments of the present application are described in further detail below with reference to the accompanying drawings.

As shown in fig. 1, the present application provides an optical cable comprising: a core assembly 1, a metal ribbon 2 and an outer sheath 3.

Wherein, the metal belt 2 is coated outside the fiber core assembly 1, both ends of the metal belt 2 are provided with an inner folded part 21 and an outer folded part 22, the inner folded part 21 is folded towards the fiber core assembly 1, the outer folded part 22 is folded back to the fiber core assembly 1, and the inner folded part 21 and the outer folded part 22 of the metal belt 2 are mutually clamped; the outer sheath 3 is wrapped outside the metal belt 2.

Because the inner folded part 21 of the metal belt 2 is folded towards the fiber core assembly 1, the outer folded part 22 is folded back towards the fiber core assembly 1, the inner folded part 21 and the outer folded part 22 are mutually clamped together and are mutually overlapped twice, in this way, the lap joint parts of the two ends of the metal belt 2 are hidden at the inner side of the metal belt 2, the lap joint edge of the sharp metal belt 2 is not directly contacted with the fiber core assembly 1 or contacted with the outer sheath 3, when the optical cable is subjected to torsion, the position of the relatively fragile outer sheath 3 cut on the metal belt 2 is the folded part of the inner folded part 21 of the metal belt 2, the end part of the metal belt 2 can not directly cut the outer sheath 3, the optical cable is repeatedly twisted in the construction process, the shearing force of the metal belt 2 on the outer sheath 3 can be relatively small, and the cracking of the outer sheath 3 can not be caused; the cutting of the metal belt 2 to the outer sheath 3 in the long-term use environment process is avoided, and the service life of the optical cable is prolonged.

In this case, the metal strip 2 is a corrugated strip or a corrugated stainless strip, which has better torsion resistance. The armoured metal belt is a double-sided film coated metal belt, the thickness of a single-sided film coating is 0.05+/-0.01 mm, the thickness of a base belt of the armoured metal belt is 0.08-0.15mm, the film coating can enable the metal belt 2 to have better wear resistance, the optimal value of the base belt thickness of the armoured metal belt is 0.1mm, and the metal belt 2 can have certain torsion resistance and tensile resistance.

As shown in fig. 2A and 2C, the inward fold 21 and the outward fold 22 of the metal strip 2 are each at an angle of 5-15 ° to the metal strip 2 in the middle. The overlapping height of the metal belt 2 is less than or equal to 6 times the thickness of the metal belt 2, so that the metal belt 2 can be tightly molded, and the problem of overlapping tilting of the metal belt 2 caused by rebound of molding internal stress is solved. As shown in fig. 2B and 2D, in other embodiments, the inward fold 21 and the outward fold 22 of the metal strip 2 may also be at right angles to the metal strip 2 in the middle.

In some alternative embodiments, the overlap of the snap-fit inner and outer folds 21, 22 is 1.5-2.5mm. The sufficient overlap avoids the problem of the metal strip 2 tilting over due to the rebound of the forming internal stress.

As shown in fig. 2, in some alternative embodiments, both the inner and outer folds 21, 22 are provided with corrugations extending axially along the core assembly 1, as shown in fig. 2C and 2D. The metal belt 2 can be tightly combined together, the friction resistance is increased, the separation of the mutually overlapped parts of the inner folded part 21 and the outer folded part 22 in the stress torsion process is avoided, the cutting action is generated on the outer sheath again, and the outer sheath 3 is damaged. In other embodiments, a planar surface may also be employed, as shown in fig. 2A and 2B.

In this example, the outer sheath 3 is made of PE, LSZH or ZRPE material, and the core assembly 1 includes a central reinforcing member 11 and an optical fiber 12.

As shown in fig. 3, in another aspect, the present application further provides a longitudinal packing device for a metal strip of an optical cable, including: the device comprises a bending part forming mechanism 4, a gathering forming mechanism 5, a bending part clamping mechanism 6 and a sizing forming mechanism 7 which are sequentially arranged.

Wherein the bending part forming mechanism 4 is used for forming an inner bending part 21 which is folded towards the fiber core assembly 1 and an outer bending part 22 which is folded back towards the fiber core assembly 1 at two ends of the metal belt 2; the gathering and forming mechanism 5 is used for forming the folded metal belt 2 into an arc shape and gathering the inner folded part 21 and the outer folded part 22; the bending part clamping mechanism 6 is used for clamping the inner bending part 21 and the outer bending part 22 which are gathered together; the sizing and forming mechanism 7 is used for compacting and forming the inner folded part 21 and the outer folded part 22 which are clamped with each other.

When the optical cable metal tape longitudinal packing device is used, firstly, the metal tape 2 passes through the bending part forming mechanism 4, so that the two ends of the metal tape 2 form an inner bending part 21 which is folded towards the fiber core assembly 1 and an outer bending part 22 which is folded back towards the fiber core assembly 1; after the metal belt 2 with two folded ends passes through the gathering forming mechanism 5, the folded metal belt 2 is firstly formed into an arc shape, and then the inner folding part 21 and the outer folding part 22 are gathered together to form a circular shape; then, the metal belt 2 in a circular shape passes through the bending part clamping mechanism 6 to ensure that the inner folding part 21 and the outer folding part 22 which are gathered mutually are mutually clamped; finally, the metal strip 2 after the inner folding part 21 and the outer folding part 22 are clamped with each other passes through the sizing forming mechanism 7, so that the inner folding part 21 and the outer folding part 22 which are clamped with each other are pressed and formed. The finally formed metal tape 2 with the inner folded part 21 and the outer folded part 22 clamped with each other is coated on the fiber core assembly 1, after the outer sheath 3 is sleeved outside the metal tape 2, the sharp joint edge of the metal tape 2 is not directly contacted with the fiber core assembly 1 or contacted with the outer sheath 3, when the optical cable is subjected to torsion, the position of the relatively fragile outer sheath 3 cut on the metal tape 2 is the folded part of the folded part 21 of the metal tape 2, the end part of the metal tape 2 cannot directly cut the outer sheath 3, the optical cable is repeatedly twisted in the construction process, the shearing force of the metal tape 2 on the outer sheath 3 is relatively small, and the cracking of the outer sheath 3 is not caused; the cutting of the metal belt 2 to the outer sheath 3 in the long-term use environment process is avoided, and the service life of the optical cable is prolonged.

In this example, when the metal tape 2 passes through the bending forming mechanism 4, the gathering forming mechanism 5, the bending clamping mechanism 6 and the sizing forming mechanism 7 in this order, the core assembly 1 also passes through the bending forming mechanism 4, the gathering forming mechanism 5, the bending clamping mechanism 6 and the sizing forming mechanism 7 at the same time, so that the metal tape 2 which finally forms the inter-clamping connection between the inner folded portion 21 and the outer folded portion 22 is coated on the core assembly 1.

In some alternative embodiments, the bending part forming mechanism 4 includes a bending forming plate 41, on which a slot 411 is formed, the width of the slot 411 is smaller than the width of the metal strip 2, and two ends of the slot 411 are respectively provided with folds 412 bending towards two sides of the slot 411, so that after the metal strip passes through the slot 411 and the folds 412, an inner fold 21 and an outer fold 22 are formed at two ends of the metal strip 2.

In this embodiment, the width of the slot 411 is set smaller than the width of the metal strip 2, and when the metal strip 2 passes through the slot 411, the two ends naturally bend, and since the two ends of the slot 411 are respectively provided with the folds 412 bending towards the two sides of the slot 411, the two ends of the metal strip 2 bend towards the folds 412 at the two ends of the slot 411 and at the two sides, and the inner folds 21 and the outer folds 22 are formed at the two sides of the metal strip 2. The bending part forming mechanism 4 has a simple structure, and is convenient and efficient to use by only arranging the narrow slits 411 which are narrower than the width of the metal belt 2 on the bending forming plate 41 and arranging the folds 412 on two sides of the end parts of the narrow slits 411 so that the metal belt 2 passes through, and forming the inner folds 21 and the outer folds 22 on two ends of the metal belt 2.

In some alternative embodiments, the gathering forming mechanism 5 comprises: a first gathering unit 51 and a forming unit 53 are provided in this order. Wherein, the first gathering assembly 51 comprises a first concave arc roller 511 and a first convex arc roller 512 which are arranged at two sides of the metal belt 2 and are matched with each other, so that the metal belt 2 forms an arc shape after passing through; the forming assembly 53 includes a first semicircular concave roller 531 and a second semicircular concave roller 532, which are matched with each other, and are respectively disposed on two sides of the circular-arc metal belt 2, so that the circular-arc metal belt 2 is gathered into a circle by the rear two ends.

In this embodiment, the radial direction of the first concave arc roller 511 is provided with an arc groove, the first convex arc roller 512 is provided with an arc protrusion matched with the arc groove, the first concave arc roller 511 is disposed below the metal belt 2, the first convex arc roller 512 is disposed above the metal belt 2, the groove of the first concave arc roller 511 is matched with the protrusion of the first convex arc roller 512, and the metal belt 2 with two folded ends passes through the space between the first concave arc roller 511 and the first convex arc roller 512 and can be rolled to form an arc shape.

The first and second semi-arc concave rollers 531 and 532 are positioned on opposite sides of the metal strip 2, respectively, when the arc-shaped metal strip 2 passes through the forming assembly 53, and the semi-arcs of the first and second semi-arc concave rollers 531 and 532 form a substantially circular path. After the circular arc-shaped metal strip 2 passes through the circular channel, the inner folded portion 21 and the outer folded portion 22 of the metal strip 2 are gathered together so that the metal strip 2 is circular.

In some alternative embodiments, the gathering and shaping mechanism 5 further includes a second gathering component 52 disposed between the first gathering component 51 and the shaping component 53, where the second gathering component 52 includes a second concave arc roller 521 and a second convex arc roller 522 that are disposed on two sides of the metal strip 2 and are matched with each other, so that the arc of the metal strip 2 in the shape of a circular arc increases.

In this embodiment, the radial direction of the second concave arc roller 521 is provided with an arc groove, the second convex arc roller 522 is provided with an arc protrusion matched with the arc groove, the second concave arc roller 521 is disposed below the metal belt 2, the second convex arc roller 522 is disposed above the metal belt 2, and the groove of the second concave arc roller 521 and the protrusion of the second convex arc roller 522 are mutually matched, and the second concave arc roller 521 and the protrusion of the second convex arc roller 522 are rolled by the first gathering assembly 51 to form an arc metal belt 2, and the arc of the arc metal belt 2 can be increased through between the second concave arc roller 521 and the second convex arc roller 522, so that the subsequent forming assembly 53 gathers the inner folded part 21 and the outer folded part 22 of the metal belt 2 together, and the metal belt 2 is circular.

In some alternative embodiments, a bending shaping plate 54 is further disposed between the second gathering component 52 and the forming component 53, an arc hole is disposed in the middle of the bending shaping plate 54, the length of the arc hole is approximately equal to the width of the metal strip 2 after being bent, and the arc is greater than the arc of the second concave arc roller 521 and the second convex arc roller 522, so that the inner folded portion 21 and the outer folded portion 22 of the metal strip 2 can be shaped after passing through the arc hole, and the arc of the arc-shaped metal strip 2 can be increased again, so that the two ends of the metal strip 2 can be gathered together by the subsequent forming component 53 to form a circle.

As shown in fig. 4, in some alternative embodiments, the bending portion clamping mechanism 6 includes a clamping template, a clamping hole 61 is formed in the clamping template to enable the inner bending portion 21 and the outer bending portion 22 to pass through the metal belt 2 after being gathered together, a holding portion 62 and a holding groove 63 are formed in the clamping hole 61, the holding portion 62 is located below the holding groove 63, the holding groove 63 is used for holding the inner bending portion 21, and the holding portion 62 is arranged on the inner side of the outer bending portion 22 to hold the metal belt 2 to drive the outer bending portion 22 to be clamped with the inner bending portion 21.

In the present embodiment, the inward folded part 21 and the outward folded part 22 of the metal strip 2 at both ends after passing through the forming member 53 have been gathered together to form a circular shape, but have not yet been caught by each other. When making circular metal strap 2 pass through the joint template, owing to be equipped with joint hole 61 in the joint template to be equipped with pressure portion 62 and holding tank 63 in the joint through-hole, and pressure portion 62 is located the below of holding tank 63, when metal strap 2 passes through joint through-hole 61, interior folded part 21 can be located holding tank 63, pressure portion 62 can press the inboard metal strap 2 of outer folded part 22, holds metal strap 2 and can drive outer folded part 22 and interior folded part 21 joint, will the joint be in the same place after interior folded part 21 and outer folded part 22 pass through pressure portion 62 and holding tank 63.

Referring again to fig. 3, in some alternative embodiments, the sizing forming mechanism 7 includes a rolling sizing assembly 71, where the rolling sizing assembly 71 includes a third semi-circular arc concave roller 711 and a fourth semi-circular arc concave roller 712 that are disposed on two sides of the metal strip 2, and the third semi-circular arc concave roller 711 and the fourth semi-circular arc concave roller 712 are matched to form a circular through hole, so that the metal strip 2 after the outer folding portion 22 and the inner folding portion 21 are clamped is sized and formed after passing through the circular through hole.

In this embodiment, the third semi-arc concave roller 711 and the fourth semi-arc concave roller 712 are respectively provided with semi-arc grooves, and the third semi-arc concave roller 711 and the fourth semi-arc concave roller 712 are respectively located at two sides of the metal belt 2, and the two semi-arc grooves are mutually matched to form a circular through hole. After the metal belt 2 passes through the bending part clamping mechanism 6, the inner bending part 21 and the outer bending part 22 are mutually gathered and clamped, but at the moment, the metal belt 2 is in a loose state, so that after the metal belt 2 is subjected to circular through holes, the outer bending part 22 and the inner bending part 21 which are mutually clamped can be compacted and sized to be formed, and falling off in the subsequent use process or the subsequent working procedure is avoided.

In some alternative embodiments, the sizing and shaping mechanism 7 further comprises a sliding sizing die plate 72 arranged between the bending part clamping mechanism 6 and the rolling sizing assembly 71, wherein sizing holes for allowing the metal strip 2 to pass through are arranged on the sliding sizing die plate 72, and the sizing holes are used for compacting the mutual clamping state between the inner folding part 21 and the outer folding part 22.

In this embodiment, since the metal strip 2 passes through the bending portion clamping mechanism 6, the inner folding portion 21 and the outer folding portion 22 are clamped together, and then the clamped state is still a relatively loose state, and the metal strip 2 directly passes through the circular through holes of the third semi-circular arc concave roller 711 and the fourth semi-circular arc concave roller 712, which may cause the clamping between the inner folding portion 21 and the outer folding portion 22 to be released. Therefore, a sliding sizing die plate 72 is arranged between the bending part clamping mechanism 6 and the rolling sizing assembly 71, sizing holes for allowing the metal strip 2 to pass through are formed in the sliding sizing die plate 72, the diameter of each sizing hole is slightly larger than or equal to that of the metal strip 2 to form a circular shape, and a certain gap is formed at the passing position of the inner folding part 21 and the outer folding part 22, so that the inner folding part 21 and the outer folding part 22 are slightly compacted, but the inner folding part 21 and the outer folding part 22 cannot be subjected to too large external force, and the inner folding part 21 and the outer folding part 22 are prevented from being suddenly subjected to too large external force to be connected in a falling mode.

In the above embodiment, the bending portion forming mechanism 4, the gathering forming mechanism 5, the bending portion clamping mechanism 6, and the sizing forming mechanism 7 are provided on the base plate 81 or the fixed shaft 83 on the side plate 82, respectively. For example, the bending forming plate 41, the bending forming plate 54, the clamping template, and the sliding sizing template 72 are provided on the base plate 81 and perpendicular to the base plate 81; the first gathering assembly 51, the second gathering assembly 52, the forming assembly 53, and the sizing mechanism 7 are disposed on a fixed shaft 83 on the side plate 82.

In summary, since the inner folded portion 21 of the metal tape 2 is folded towards the core assembly 1, the outer folded portion 22 is folded away from the core assembly 1, the inner folded portion 21 and the outer folded portion 22 are clamped together, the overlapping portions of the two ends of the metal tape 2 are hidden inside the metal tape 2, the sharp overlapping edge of the metal tape 2 is not directly contacted with the core assembly 1 or the outer sheath 3, when the optical cable is subjected to torsion, the position of the relatively fragile outer sheath 3 cut on the metal tape 2 is the folded portion of the inner folded portion 21 of the metal tape 2, the end portion of the metal tape 2 is not directly cut on the outer sheath 3, the optical cable is repeatedly twisted in the construction process, the shearing force of the metal tape 2 on the outer sheath 3 is relatively small, and the cracking of the outer sheath 3 is not caused; the cutting of the metal belt 2 to the outer sheath 3 in the long-term use environment process is avoided, and the service life of the optical cable is prolonged.

The optical cable metal belt longitudinal wrapping device is characterized in that through a metal belt 2, an inner folding part 21 folded towards the fiber core assembly 1 and an outer folding part 22 folded back towards the fiber core assembly 1 are formed at two ends of the metal belt 2 by a folding part forming mechanism 4; after the metal belt 2 with two folded ends passes through the gathering forming mechanism 5, the folded metal belt 2 is firstly formed into an arc shape, and then the inner folding part 21 and the outer folding part 22 are gathered together to form a circular shape; then, the metal belt 2 in a round shape passes through the bending part clamping mechanism 6 to ensure that the inner folding part 21 and the outer folding part 22 which are gathered mutually are mutually clamped; finally, the metal strip 2 after the inner folding part 21 and the outer folding part 22 are clamped with each other passes through the sizing forming mechanism 7, so that the inner folding part 21 and the outer folding part 22 which are clamped with each other are pressed and formed. The automatic longitudinal wrapping of the metal belt 2 is realized, and the structure is simple and efficient.

In the description of the present application, it should be noted that the azimuth or positional relationship indicated by the terms "upper", "lower", etc. are based on the azimuth or positional relationship shown in the drawings, and are merely for convenience of describing the present application and simplifying the description, and are not indicative or implying that the apparatus or element in question must have a specific azimuth, be constructed and operated in a specific azimuth, and thus should not be construed as limiting the present application. Unless specifically stated or limited otherwise, the terms "mounted," "connected," and "coupled" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art according to the specific circumstances.

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

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

Claims

1. An optical cable, comprising:

a core assembly (1);

the metal belt (2) is coated on the outer side of the fiber core assembly (1), two ends of the metal belt (2) are provided with an inner folded part (21) and an outer folded part (22), the inner folded part (21) is folded towards the fiber core assembly (1), the outer folded part (22) is folded back to the fiber core assembly (1), and the inner folded part (21) and the outer folded part (22) of the metal belt (2) are clamped with each other;

and an outer sheath (3) which is coated outside the metal belt (2).

2. The fiber optic cable of claim 1, wherein: the inner folded part (21) and the outer folded part (22) are respectively provided with a wave pattern extending along the axial direction of the fiber core component (1).

3. The fiber optic cable of claim 1, wherein: the overlapped part of the inner folded part (21) and the outer folded part (22) after being clamped is 1.5-2.5mm.

4. A longitudinal wrapping device for a metal ribbon of an optical cable, comprising:

a bending part forming mechanism (4) for forming both ends of the metal belt (2) into an inner bending part (21) folded toward the fiber core assembly (1) and an outer bending part (22) folded away from the fiber core assembly (1);

a gathering and forming mechanism (5) for forming the folded metal strip (2) into an arc shape and gathering the inner folded portion (21) and the outer folded portion (22) with each other;

a bending part clamping mechanism (6) for clamping the inner bending part (21) and the outer bending part (22) after being gathered together;

and the sizing forming mechanism (7) is used for compacting and forming the inner folded part (21) and the outer folded part (22) which are clamped with each other.

5. The optical cable metal strip longitudinal wrapping device as claimed in claim 4, wherein the bending part forming mechanism (4) comprises a bending forming plate (41) provided with a narrow slit (411), the width of the narrow slit (411) is smaller than that of the metal strip (2), and two ends of the narrow slit (411) are respectively provided with a crease (412) bending towards two sides of the narrow slit (411), so that after the metal strip passes through the narrow slit (411) and the crease (412), an inner crease (21) and an outer crease (22) are formed at two ends of the metal strip (2).

6. The longitudinal wrapping device of a metal strip for optical cable according to claim 4, wherein the gathering and shaping mechanism (5) comprises:

the first gathering assembly (51) comprises a first concave arc surface roller (511) and a first convex arc surface roller (512) which are arranged at two sides of the metal belt (2) and are matched with each other, so that the metal belt (2) forms an arc shape after passing through;

the forming assembly (53), the forming assembly (53) comprises a first semicircular arc concave roller (531) and a second semicircular arc concave roller (532) which are matched with each other and are respectively used for being arranged on two sides of the metal belt (2) in an arc shape, so that the metal belt (2) in an arc shape is gathered into a circle through the rear two ends.

7. The optical cable metal strip longitudinal wrapping device according to claim 6, wherein the gathering and forming mechanism (5) further comprises a second gathering component (52) which is arranged between the first gathering component (51) and the forming component (53), and the second gathering component (52) comprises a second concave arc roller (521) and a second convex arc roller (522) which are arranged at two sides of the metal strip (2) and are matched with each other, so that the radian of the metal strip (2) in a circular arc shape is increased.

8. The optical cable metal strap longitudinal wrapping device according to claim 4, wherein the bending part clamping mechanism (6) comprises a clamping template, a clamping through hole (61) for allowing the inner folded part (21) and the outer folded part (22) to pass through after the metal strap (2) is gathered with each other is formed in the clamping template, a pressing part (62) and a containing groove (63) are formed in the clamping through hole (61), the pressing part (62) is located below the containing groove (63), the containing groove (63) is used for containing the inner folded part (21), and the pressing part (62) is used for being arranged on the inner side of the outer folded part (22) so as to press the metal strap (2) to drive the outer folded part (22) to be clamped with the inner folded part (21).

9. The optical cable metal strip longitudinal wrapping device according to claim 4, wherein the sizing forming mechanism (7) comprises a rolling sizing assembly (71), the rolling sizing assembly (71) comprises a third semicircular arc concave roller (711) and a fourth semicircular arc concave roller (712) which are arranged on two sides of the metal strip (2), the third semicircular arc concave roller (711) and the fourth semicircular arc concave roller (712) are matched with each other to form a circular through hole, and the metal strip (2) after the outer folded part (22) and the inner folded part (21) are clamped is subjected to sizing forming through the circular through hole.

10. The device for longitudinally wrapping a metal strip for optical cable according to claim 5, characterized in that said sizing forming mechanism (7) further comprises a sliding sizing die plate (72) arranged between said bending portion clamping mechanism (6) and a rolling sizing assembly (71), said sliding sizing die plate (72) being provided with sizing holes for passing said metal strip (2), said sizing holes being used for compacting the mutual clamping condition between said inner folded portion (21) and said outer folded portion (22).