CN211921330U

CN211921330U - Wet-dry die for drawing thin-diameter optical fiber

Info

Publication number: CN211921330U
Application number: CN201922346140.5U
Authority: CN
Inventors: 张子豪; 江锋; 潘丰; 计金龙; 缪立枫; 钱海炳; 平湖; 张梁; 顾杰
Original assignee: Jiangsu Fasten Optical Communication Technology Co ltd; Jiangsu Fasten Photonics Co ltd
Current assignee: Jiangsu Fasten Optical Communication Technology Co ltd; Jiangsu Fasten Photonics Co ltd
Priority date: 2019-12-24
Filing date: 2019-12-24
Publication date: 2020-11-13
Anticipated expiration: 2029-12-24

Abstract

The utility model relates to a wet-dry mould for drawing thin-diameter optical fibers, which comprises a mould core and a mould frame, wherein the centre of the mould frame is provided with a base, the base protrudes upwards out of the main body of the mould frame, the periphery of the base is provided with an axial positioning ring groove, the centre of the base is provided with a central hole, the central hole is a multi-step hole, and the mould core is detachably assembled with a step of the central hole; the optical fiber coating mold comprises a mold core and is characterized in that the mold core is provided with a core hole, an optical fiber penetrates through the core hole of the mold core from top to bottom, the core hole is in a horn shape with the aperture gradually reduced from top to bottom, and the minimum aperture at the bottom of the core hole is consistent with the coating outer diameter of the optical fiber. The utility model discloses realize the coating to optic fibre at optic fibre drawing in-process, the mold core structure of design can ensure that optic fibre coating is even, to the accurate control of coating external diameter. In addition, only the mold core needs to be replaced according to different coating diameters, the mold frame can be matched with the mold cores with different core holes all the time, and the spare part cost of enterprises is saved.

Description

Wet-dry die for drawing thin-diameter optical fiber

Technical Field

The utility model relates to a wet to dry mould for drawing thin footpath optic fibre.

Background

With the large-scale promotion of metropolitan area network communication construction and the construction of other infrastructures such as cables and gas, underground pipelines and channel routing resources for laying communication optical cables in cities are gradually scarce. The development of small diameter optical fibers and their production is a trend, for example, the market has raised the need to reduce the coating diameter of single mode optical fibers from conventional 245um to a small size of 200 um.

At present, a coating die designed for 200um small-diameter optical fiber production does not exist, and the conventional wet-to-wet die is usually adopted for production, so that more optical fibers are usually scrapped due to larger coating outer diameters in the speed-up stage of optical fiber production by the method, and the coating of the optical fibers is completed in one step in the same die, so that the inner and outer coating outer diameters of the optical fibers are difficult to control respectively.

SUMMERY OF THE UTILITY MODEL

The utility model aims to solve the technical problem that provide the WOD (wet on dry) mould that is used for drawing thin footpath optic fibre to above-mentioned prior art, can produce the stable thin footpath optic fibre of coating external diameter, can be used to the coating of the thin footpath optic fibre of diameter 200 um.

The utility model provides a technical scheme that above-mentioned problem adopted does: a wet-dry die for drawing a thin-diameter optical fiber comprises a die core and a die frame, wherein a base is arranged at the center of the die frame and protrudes upwards out of a die frame main body, an axial positioning ring groove is formed in the periphery of the base, a center hole is formed in the center of the base and is a multi-step hole, and the die core is detachably assembled with one step of the center hole; the optical fiber coating mold comprises a mold core and is characterized in that the mold core is provided with a core hole, an optical fiber penetrates through the core hole of the mold core from top to bottom, the core hole is in a horn shape with the aperture gradually reduced from top to bottom, and the minimum aperture at the bottom of the core hole is consistent with the coating outer diameter of the optical fiber.

Preferably, the core hole is streamline, so that the liquid coating is smoothly guided to the bottom of the core hole from the periphery, and the uniform coating on the periphery of the optical fiber is ensured.

Preferably, the centre bore of die carrier is from the top down for first step hole, second step hole, third step hole and bell mouth in proper order, the mold core with the assembly of second step hole, the bell mouth is the bell mouth of from the top aperture expansion. This structure is beneficial for heat dissipation.

Preferably, the die carrier main part is evenly provided with the fixed orifices all around. The mould is conveniently fixed on the base.

Preferably, the die comprises an inner coating die and an outer coating die, wherein each of the inner coating die and the outer coating die comprises a die core and a die carrier, a base is arranged at the center of the die carrier and protrudes upwards out of a die carrier main body, an axial positioning ring groove is formed in the periphery of the base, a center hole is formed in the center of the base and is a multi-step hole, and the die core is detachably assembled with one step hole of the center hole;

the mold core has the core hole, and optic fibre down passes from last the core hole of mold core, the core hole is the loudspeaker form that from top to bottom aperture reduces gradually, and interior coating die core hole bottom minimum aperture is unanimous with the inlayer coating external diameter of optic fibre, interior coating die core hole bottom minimum aperture is unanimous with the outer coating external diameter of optic fibre, and interior coating die's die carrier and the die carrier structure of outer coating die are the same completely.

Compared with the prior art, the utility model has the advantages of: the utility model discloses a section is to thin footpath optic fibre coated mould, coats optic fibre at optic fibre drawing in-process, and this mold core structure can ensure that optic fibre coating is even, and the accurate control of coating external diameter. In addition, the original integrated coating die is designed into a combined piece of the die core and the die carrier, the die core only needs to be replaced aiming at different coating diameters, the die carrier can be matched with the base all the time, replacement is not needed, and the spare part cost of an enterprise is greatly saved.

Drawings

FIG. 1 is a longitudinal cross-sectional view of a mold core according to an embodiment of the present invention;

fig. 2 is a bottom view of the mold frame according to the embodiment of the present invention;

fig. 3 is a vertical cross-sectional view of the die carrier according to the embodiment of the present invention;

mold core 1

Seat 2

Die carrier body 3

Locating ring groove 4

Fixing hole 5

First stepped hole a

Second stepped hole b

Third stepped hole c

Tapered bore d

Core hole 101

Detailed Description

The invention is described in further detail below with reference to the embodiments of the drawing, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.

The terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.

In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

The wet-dry die for drawing the thin-diameter optical fiber comprises a die core 1 and a die frame, wherein a protruding seat 2 is arranged at the center of the die frame, the seat 2 protrudes upwards from a die frame main body 3, an axial positioning ring groove 4 is formed in the periphery of the seat 2, four fixing holes 5 are uniformly formed in the periphery of the die frame main body 3, the die frame is fixed to a base through the four fixing holes 5 by locking screws, and the seat can be positioned through the positioning ring groove 4 and is inserted into the base.

The center of the seat 2 is provided with a center hole which is a multi-step stepped hole and sequentially comprises a first stepped hole a, a second stepped hole b, a third stepped hole c and a conical hole d from top to bottom, the aperture of the first stepped hole a is larger than that of the second stepped hole b, and the aperture of the second stepped hole b is larger than that of the third stepped hole c. The mold core 1 is assembled with the second stepped hole c, and the tapered hole d is a tapered hole with an enlarged diameter from top to bottom. The mold core 1 is provided with a core hole 101, the core hole 101 is in a streamline trumpet shape with the aperture gradually reduced from top to bottom, and the minimum aperture at the bottom of the core hole 101 is consistent with the coating outer diameter of the coating on the optical fiber.

The molten coating is introduced into the mold and enters the core hole 101 of the mold core 1, and the optical fiber passes through the core hole from top to bottom, thereby completing coating of the coating.

When the mold is used for coating, the mold cores with different core holes can be selected according to different coating outer diameters, the mold frame does not need to be replaced, and therefore spare part cost can be greatly saved.

The mold core 1 of the embodiment is cylindrical tungsten steel, and the appearance structure of the mold core is matched with the second stepped hole b. The design of the core hole can realize the uniform coating of the coating on the optical fiber and the control of the coating outer diameter, and realize the stable production.

When the external fiber is coated inside and outside, an internal coating die and an external coating die are adopted for coating in sequence, and the internal coating die and the external coating die only adopt die cores with different core holes, so that the accurate control of the internal coating outer diameter and the external coating outer diameter can be effectively realized.

The mold of the above structure is suitable for coating a thin-diameter optical fiber, particularly a thin-diameter optical fiber having a diameter of 200 um.

Although the preferred embodiments of the present invention have been described in detail hereinabove, it should be clearly understood that modifications and variations of the present invention are possible to those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A wet-dry die for drawing a thin-diameter optical fiber, comprising: the die comprises a die core and a die carrier, wherein a base is arranged at the center of the die carrier and protrudes upwards out of a die carrier main body, an axial positioning ring groove is arranged at the periphery of the base, a center hole is formed in the center of the base and is a multi-step hole, and the die core is detachably assembled with one step of the center hole; the optical fiber coating mold comprises a mold core and is characterized in that the mold core is provided with a core hole, an optical fiber penetrates through the core hole of the mold core from top to bottom, the core hole is in a horn shape with the aperture gradually reduced from top to bottom, and the minimum aperture at the bottom of the core hole is consistent with the coating outer diameter of the optical fiber.

2. The wet-dry die for drawing a small diameter optical fiber according to claim 1, wherein: the core hole is streamline.

3. The wet-dry die for drawing a small diameter optical fiber according to claim 1, wherein: the centre bore of die carrier is from last down be first step hole, second step hole, third step hole and bell mouth in proper order, the mold core with the assembly of second step hole, the bell mouth is the bell mouth of from the top aperture expansion.

4. The wet-dry die for drawing a small diameter optical fiber according to claim 1, wherein: the die carrier main part is evenly provided with the fixed orifices all around.

5. A wet-dry die for drawing a thin-diameter optical fiber, comprising: the die comprises an inner coating die and an outer coating die, wherein the inner coating die and the outer coating die both comprise a die core and a die carrier, the center of the die carrier is provided with a base, the base protrudes upwards out of a die carrier main body, the periphery of the base is provided with an axial positioning ring groove, the center of the base is provided with a center hole, the center hole is a multi-step hole, and the die core is detachably assembled with the step hole of the center hole;

6. The wet-dry die for drawing a small diameter optical fiber according to claim 5, wherein: the core hole is streamline.

7. The wet-dry die for drawing a small diameter optical fiber according to claim 5, wherein: the centre bore of die carrier is from last down be first step hole, second step hole, third step hole and bell mouth in proper order, the mold core with the assembly of second step hole, the bell mouth is the bell mouth of from the top aperture expansion.

8. The wet-dry die for drawing a small diameter optical fiber according to claim 5, wherein: the die carrier main part is evenly provided with the fixed orifices all around.