WO2021128401A1

WO2021128401A1 - Air-blown micro-cable and fabrication method

Info

Publication number: WO2021128401A1
Application number: PCT/CN2019/129632
Authority: WO
Inventors: 沈冰冰; 缪小明; 李新建; 谭枫
Original assignee: 江苏中天科技股份有限公司
Priority date: 2019-12-28
Filing date: 2019-12-28
Publication date: 2021-07-01

Abstract

An air-blown micro-cable (100) and a fabrication method, wherein the air-blown micro-cable (100) comprises a central reinforcement member (10), optical fiber units (20), a first water blocking filler (30) and a sheath (40); the optical fiber units (20) are twisted on the peripheral side of the central reinforcement member (10) to form a cable core (25); the first water blocking filler (30) is filled in a twisting gap between the optical fiber units (20) and the central reinforcement member (10); and the sheath (40) covers the peripheral side of the cable core (25). The fabrication method comprises: a cable forming step (S1), in which the optical fiber units (20) are twisted on the peripheral side of the central reinforcement member (10) to form the cable core (25); a pulling step (S2), in which the twisted cable core (25) is clamped and is pulled to a sheathing machine at a constant speed; and a sheathing step (S3), in which the sheath (40) is extruded on the peripheral side of the cable core (25) by means of the sheathing machine, wherein the cable core (25) in the pulling step (S2) is clamped by means of a pulling device and is pulled to the sheathing machine at the constant speed. The air-blown micro-cable (100) and the fabrication method have the advantages of high production efficiency and being capable of effectively improving the air blowing performance.

Description

Air blown micro cable and manufacturing method

Technical field

The invention relates to the field of communication optical cables, in particular to an air blown micro cable and a manufacturing method.

Background technique

Air-blown micro-cables are generally used for communication lines under the condition of tight urban pipeline resources, and have the characteristics of high fiber density and fast air-blown laying. The structure of the air-blown micro-cable is generally stranded, in which the stranded structure includes a central reinforcement, an optical fiber unit around the central reinforcement, a water-blocking material, a yarn tie and a sheath. Among them, the yarn binding is processed in the cable forming process by the yarn binding machine. The main function of the yarn binding is to fix the stranded optical fiber unit into a round and compact cable core to facilitate the production of the subsequent sheathing process. Since the cable forming and sheathing processes cannot be combined in the production process, the production efficiency of the air blown microcable is low. In addition, the conventional stranded air-blown microcable structure has a tying yarn between the optical fiber unit and the sheath. The thickness of the tying yarn affects the regularity of the stranded pattern of the optical fiber unit on the surface of the sheath, which is not conducive to the air-blowing performance of the microcable. The promotion.

Summary of the invention

In view of this, it is necessary to provide an air-blown microcable with high production efficiency and can effectively improve air-blown performance and a manufacturing method.

An embodiment of the present invention provides a method for manufacturing an air-blown microcable, including:

In the cabling step, the optical fiber unit is twisted on the peripheral side of the central strength member to form a cable core;

In the pulling step, the stranded cable core is clamped and pulled to the sheathing machine at a constant speed;

In the sheathing step, the sheath is extruded on the peripheral side of the cable core by a sheathing machine.

Further, the cable core in the pulling step is clamped by a pulling device and pulled to the sheathing machine at a constant speed.

Further, the traction equipment includes a front-stage clamp-type tractor and a subsequent-stage clamp-type tractor. The front-stage clamp-type tractor is close to the stranding point of the optical fiber unit, and the rear-stage clamp-type tractor is close to the Sheathing machine.

Further, the front-stage clamp-type tractor clamps the stranded cable core and pulls it to the rear-stage clamp-type tractor to prevent the cable core from being loose and misaligned.

Further, the latter-stage tong-type tractor feeds the stranded cable core into the sheathing machine at a constant speed.

Further, the cabling step further includes:

Fill the first water blocking filler at the stranding gap between the optical fiber unit and the central reinforcement.

An embodiment of the present invention also provides an air-blown microcable manufactured using the above-mentioned air-blown microcable manufacturing method. The air-blown microcable includes a central reinforcement, an optical fiber unit, a first water blocking filler, and a sheath. The optical fiber unit is twisted on the peripheral side of the central strength member to form a cable core, the first water blocking filler is filled in the twisted gap between the optical fiber unit and the central strength member, and the sheath is wrapped around the cable Core circumference side.

Further, the optical fiber unit includes an optical fiber, a loose tube and a second water blocking filler, the optical fiber is filled in the loose tube, and the second water blocking filler is filled in the loose tube.

Further, the deviation of the outer diameter of the air-blown micro-cable is less than 0.1 mm.

Further, the first water blocking filler and the second water blocking filler include one of a water blocking yarn, a water blocking ointment, and a water blocking powder.

In the above-mentioned air-blown micro-cable and manufacturing method, the yarn binding process in the cable forming step and the sheathing step is reduced, and the cable forming step and the sheathing step are combined into one through the pulling step , The circulation time of semi-finished products is reduced, and the production efficiency of the air-blown micro-cable is improved. In addition, it is avoided that the thickness of the binding yarn affects the regularity of the stranded lines of the optical fiber unit on the sheath surface and the deviation of the outer diameter of the air-blown micro-cable, thereby improving the air-blown performance of the air-blown micro-cable.

Description of the drawings

Fig. 1 is a cross-sectional structure diagram of an air-blown microcable in an embodiment of the present invention.

Fig. 2 is a schematic flow chart of a method for manufacturing an air-blown microcable in an embodiment of the present invention.

Symbol description of main components

气吹微缆Air blown microcable	100100
中心加强件 Center reinforcement	1010
光纤单元 Fiber Unit	2020
光纤optical fiber	21twenty one
松套管Loose tube	22twenty two
第二阻水填充物The second water blocking filler	23twenty three
缆芯 Cable core	2525
第一阻水填充物The first water blocking filler	3030
护套 jacket	4040

The following specific embodiments will further illustrate the present invention in conjunction with the above-mentioned drawings.

Detailed ways

In order to more clearly understand the above objectives, features, and advantages of the embodiments of the present invention, the present invention will be described in detail below with reference to the accompanying drawings and specific implementations. It should be noted that, in the case of no conflict, the features in the embodiments of the present application can be combined with each other.

In the following description, many specific details are set forth in order to fully understand the embodiments of the present invention. The described embodiments are part of the embodiments of the present invention, rather than all of them. Based on the embodiments of the present invention, all other embodiments obtained by a person of ordinary skill in the art without creative work shall fall within the protection scope of the embodiments of the present invention.

Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the technical field of the embodiments of the present invention. The terminology used in the specification of the present invention is only for the purpose of describing specific embodiments, and is not intended to limit the embodiments of the present invention.

Please refer to FIG. 1, the air-blown microcable 100 includes a central strength member 10, an optical fiber unit 20, a first water blocking filler 30 and a sheath 40. The optical fiber unit 20 is twisted on the peripheral side of the central strength member 10, the first water blocking filler 30 is filled in the stranded space between the optical fiber unit 20 and the central strength member 10, and the sheath 40 wraps It covers the outside of the optical fiber unit 20.

The central reinforcement 10 is arranged at the axial position of the air-blown micro-cable 100 to strengthen the structural strength of the air-blown micro-cable 100 and increase the tensile load of the air-blown micro-cable 100. In one embodiment, the central reinforcement 10 is a non-metal reinforced plastic rod made of a non-metallic material, and the non-metallic material may be a fiber-reinforced composite material, such as CFRP, GFRP, AFRP, BFRP, and the like. In other embodiments, the central reinforcement 10 is formed by stranding steel wires or other equivalent reinforcement materials.

The optical fiber unit 20 is twisted on the peripheral side of the central strength member 10, and the adjacent optical fiber units abut each other to form a compact cable core 25. Specifically, the optical fiber unit 20 includes an optical fiber 21, a loose tube 22, and a second water blocking filler 23. The optical fiber 21 is filled in the loose tube 22, and the second water blocking filler 23 is filled in Inside the loose tube 22 to improve the water blocking capability of the optical fiber unit 20. The second water blocking filler 23 includes one of a water blocking yarn, a water blocking ointment, and a water blocking powder. In one embodiment, the second water blocking filler 23 is a water blocking ointment. In one embodiment, the number of the optical fiber units 20 is six.

The first water blocking filler 30 is filled in the gap between the loose tube 22 and the central reinforcement 10 to improve the water blocking capability of the air-blown microcable 100. The first water blocking filler 30 includes one of a water blocking yarn, a water blocking ointment, and a water blocking powder. In one embodiment, the first water blocking filler 30 is a water blocking yarn.

The sheath 40 covers the peripheral side of the cable core 25 to improve the structural strength of the air-blown microcable 100 and protect the cable core 25. Specifically, the sheath 40 is extruded outside the cable core 25 by a sheathing machine. Compared with the conventional stranded air blown microcable structure, the conventional stranded air blown microcable is provided with a tying yarn between the fiber unit and the sheath, and the thickness of the tie yarn affects the twisting of the fiber unit on the surface of the sheath. The regularity of the pattern is not conducive to the improvement of the air blowing performance of the micro-cable. The air-blown micro-cable 100 provided by the present invention removes the yarn binding between the optical fiber unit 20 and the sheath 40, so that the surface of the air-blown micro-cable 100 is regularized to reflect the twisting of the optical fiber unit 20 The combined pattern makes it easier for the high-speed airflow to form a uniform drag force on the surface of the air-blown micro-cable 100 during the air-blown laying process, thereby improving the air-blown laying performance of the air-blown micro-cable 100. In addition, the air-blown microcable 100 removes the yarn tie between the optical fiber unit 20 and the sheath 40, so that the outer diameter deviation of the air-blown microcable 100 is less than 0.1 mm, which improves the air-blown microcable. 100 air blowing performance.

Referring to FIG. 2, the present invention also provides a method for manufacturing an air-blown microcable, which is used to manufacture the above-mentioned air-blown microcable 100, which specifically includes the following steps:

S1, the cabling step: twist the optical fiber unit 20 on the peripheral side of the central strength member 10 to form a cable core 25;

In one embodiment, the optical fiber unit 20 is twisted on the peripheral side of the central reinforcement 10 by a twisting device to form a round and compact cable core 25. The first water blocking filler 30 is filled in the gap between the loose tube 22 and the central reinforcement 10 to improve the water blocking capability of the air-blown microcable 100. The first water blocking filler 30 is a water blocking yarn.

S2, pulling step: clamping the stranded cable core 25 and pulling it to the sheathing machine at a constant speed;

In one embodiment, the cable core 25 is clamped by a traction device and pulled to the sheathing machine at a constant speed. The traction equipment includes a front-stage clamp-type tractor and a rear-stage clamp-type tractor, the front-stage clamp-type tractor is close to the stranding equipment, and the rear-stage clamp-type tractor is close to the sheathing machine. The front-stage clamp-type tractor clamps the stranded cable core 25 and pulls it to the subsequent-stage clamp-type tractor to prevent the cable core 25 from being loose and misaligned. The latter-stage tong-type tractor feeds the stranded cable core 25 into the sheathing machine at a constant speed to extrude the sheath 40 on the peripheral side of the cable core 25.

S3, sheathing step: the sheath 40 is extruded on the peripheral side of the cable core 25 by a sheathing machine.

In one embodiment, the sheathing machine is provided with an extruder head, and the cable core 25 is fed into the extruder head at a constant speed by the rear-stage clamp tractor, and the sheath 40 is extruded on the peripheral side of the cable core 25 by the extruder head.

In the above-mentioned air-blown micro-cable manufacturing method, the cable forming step and the sheathing step are combined into one through the traction step, which reduces the circulation time of semi-finished products and improves the production efficiency of the air-blown micro-cable 100 . Compared with the conventional production process, the yarn binding step between the cable forming step and the sheathing step is reduced. The thickness of the tying yarn is prevented from affecting the regularity of the stranded pattern of the optical fiber unit 20 on the surface of the sheath 40, so that the surface of the air-blown microcable 100 can be regularized to reflect the stranded pattern of the optical fiber unit 20. During the laying process, the high-speed airflow can more easily form a uniform drag force on the surface of the air-blown micro-cable 100, which improves the air-blown laying performance of the air-blown micro-cable 100. In addition, in the manufacturing method of the air-blown microcable, the yarn binding between the optical fiber unit 20 and the sheath 40 is removed, so that the deviation of the outer diameter of the air-blown microcable 100 is less than 0.1 mm, which improves the air-blown microcable 100. The air blowing performance of the microcable 100.

The above embodiments are only used to illustrate the technical solutions of the embodiments of the present invention and not to limit them. Although the embodiments of the present invention are described in detail with reference to the above preferred embodiments, those of ordinary skill in the art should understand that the technical solutions of the embodiments of the present invention can be compared. Modifications or equivalent replacements of the solutions should not depart from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

An air-blown microcable manufacturing method, characterized in that, the method includes:

In the cabling step, the optical fiber unit is twisted on the peripheral side of the central strength member to form a cable core;

In the pulling step, the stranded cable core is clamped and pulled to the sheathing machine at a constant speed;

In the sheathing step, the sheath is extruded on the peripheral side of the cable core by a sheathing machine.
The method for manufacturing an air-blown microcable according to claim 1, wherein the cable core in the pulling step is clamped by a pulling device and pulled to the sheathing machine at a constant speed.
The method of manufacturing an air-blown microcable according to claim 2, wherein the traction equipment includes a front-stage clamp-type tractor and a rear-stage clamp-type tractor, and the front-stage clamp-type tractor is close to the optical fiber unit At the stranding point, the rear-stage tong-type tractor is close to the sheathing machine.
The method for manufacturing an air-blown microcable according to claim 3, wherein the front-stage clamp-type tractor clamps the stranded cable core and pulls it to the rear-stage clamp-type tractor to prevent The cable core appears loose and misplaced.
The method for manufacturing an air-blown microcable according to claim 4, wherein the rear-stage tong-type tractor feeds the stranded cable core into the sheathing machine at a constant speed.
The method for manufacturing an air-blown microcable according to claim 1, wherein the step of forming a cable further comprises:

Fill the first water blocking filler at the stranding gap between the optical fiber unit and the central reinforcement.
An air-blown micro-cable, which is manufactured by the method of manufacturing the air-blown micro-cable as claimed in any one of claims 1 to 6, characterized in that: the air-blown micro-cable includes a central strength member, an optical fiber unit, and a first A water blocking filler and a sheath, the optical fiber unit is twisted on the peripheral side of the central reinforcement member to form a cable core, and the first water blocking filler is filled in the twisted gap between the optical fiber unit and the central reinforcement member, The sheath is wrapped around the peripheral side of the cable core.
The air-blown microcable according to claim 7, wherein the optical fiber unit comprises an optical fiber, a loose tube and a second water blocking filler, the optical fiber is filled in the loose tube, and the second blocking The water filling is filled in the loose tube.
The air-blown micro-cable according to claim 8, wherein the deviation of the outer diameter of the air-blown micro-cable is less than 0.1 mm.
8. The air-blown microcable according to claim 8, wherein the first water blocking filler and the second water blocking filler comprise one of a water blocking yarn, a water blocking ointment, and a water blocking powder.