CN105819680A - Optical fiber processing technology - Google Patents

Abstract

The invention discloses an optical fiber processing technology, which comprises the following steps: 1) clamping an auxiliary rod with a chuck, controlling the chuck to lift up and down, so that the lower part of the prefabricated rod extends into a wire drawing furnace; 2) working the wire drawing furnace, heating 3) The preform is melted and drawn by its own gravity; 4) The drooping wire is first cooled and shaped by the shaping tube, and then further cooled by the cooling tube; 5) Coating the cooled optical fiber After the coating and curing process, the optical fiber is obtained. By controlling the reciprocating rotation of the drawing furnace, this processing technology can ensure that the preform is heated evenly along the circumferential direction, thereby ensuring the drawing quality.

Description

Optical fiber processing technology

technical field

The invention relates to the field of optical fibers, in particular to a processing technology for optical fibers.

Background technique

Optical fiber processing includes drawing process, shaping cooling process, coating process and curing process. Existing optical fiber drawing furnaces mainly include graphite resistance furnaces, graphite induction furnaces, etc. During the drawing process, temperature is the key control parameter. During the heating process, if the preform is heated unevenly, the viscosity of each part of the preform will be different. That is, the viscous state of the glass body is different during the wire drawing forming process. At the same drawing speed, the part that absorbs more heat has a fast temperature rise, low viscosity, and is prone to accumulation; while the part that absorbs less heat and has a slow temperature rise will be insufficiently formed. , which leads to poor ellipticity of the formed wire on the same section, and serious inconsistency of wire diameter within a certain length range.

The existing optical fiber drawing furnace is fixed, it is difficult to ensure the coaxiality of the glass rod and the furnace, and there will still be uneven heating of the preform along the circumferential direction, which brings great difficulty to the drawing process; and because the prefabricated The material characteristics of rods and auxiliary rods. When the fiber drawing furnace is working, the light of the heating element will pass through the preform rod and auxiliary rods. This not only wastes heat energy, but also leads to a higher temperature in the production environment, which is relatively harsh.

Contents of the invention

Aiming at the above problems, the present invention overcomes at least one deficiency and proposes an optical fiber processing technology.

The technical scheme that the present invention takes is as follows:

A process for processing an optical fiber, comprising the steps of:

1) Clamp the auxiliary rod with the chuck, control the lifting of the chuck, so that the lower part of the preform rod extends into the drawing furnace;

2) The wire drawing furnace is working, heating the preform, and at the same time controlling the reciprocating rotation of the wire drawing furnace;

3) The preform is melted and drawn down by its own gravity;

4) The drooping silk thread is first cooled and shaped by the shaping tube, and then further cooled by the cooling tube;

5) After the cooled optical fiber is coated and solidified, an optical fiber is obtained.

By controlling the reciprocating rotation of the drawing furnace, this processing technology can ensure that the preform is heated evenly along the circumferential direction, thereby ensuring the drawing quality.

Optionally, the preform rod and the auxiliary rod in the step 1) are integrated by flame welding, and the diameter of the preform rod is larger than the diameter of the auxiliary rod, and there is an arc-shaped transition section between the preform rod and the auxiliary rod; Before the disk clamps the auxiliary rod, a glass sleeve is set on the arc transition section through the auxiliary rod, and then the copper telescopic sleeve is sleeved on the auxiliary rod; the glass sleeve includes a bottom wall and a cylindrical side wall , the outer diameter of the cylindrical side wall of the glass sleeve is the same as that of the prefabricated rod, and the bottom wall of the glass sleeve has a first through hole for the auxiliary rod to pass through; one end of the copper telescopic sleeve is closed, and the copper sleeve One end of the tube abuts against the upper surface of the glass sleeve, and the other end is closed and abuts against the upper end surface of the auxiliary rod.

The outer diameter of the cylindrical side wall of the glass sleeve is the same as that of the preform. This structure can prevent the gap between the preform and the inlet of the drawing furnace from becoming larger due to the arc-shaped transition section, resulting in a large amount of air entering the heating furnace; through The copper telescopic sleeve can not only reflect the light into the heating furnace, but also can adapt to auxiliary rods of various lengths.

Optionally, the copper telescopic tube includes a plurality of telescopic sections, wherein the uppermost telescopic section has a second through hole matching the process hole of the auxiliary rod.

Optionally, the interior of the glass sleeve is filled with a reflective layer.

By setting the reflective layer, the light passing through the preform rod and the auxiliary rod can be reflected back, thereby improving the heating efficiency and improving the processing environment.

Optionally, the reflective layer is made of metal.

Optionally, the drawing furnace in said step 2) includes:

fixed seat;

Heating furnace body, the bottom is rotated and installed on the fixed seat, and the heating furnace body is equipped with a cooling water cavity;

a driving mechanism to drive the heating furnace body to rotate back and forth along its own axis;

The water inlet pipe passes through the heating furnace body and communicates with the lower part of the cooling water chamber;

The water outlet pipe passes through the heating furnace body and communicates with the upper part of the cooling water cavity.

Optionally, the outer wall of the heating furnace body is provided with two limiting rings for supporting the water pipe, one of which is located under the water inlet pipe, and the other is located under the water outlet pipe.

By setting the limit ring, the winding of the water inlet pipe and the water outlet pipe can be facilitated, and the reliable reciprocating rotation of the heating furnace body can be ensured.

Optionally, the heating furnace body cooperates with the fixed seat through bearings, wherein the heating furnace is relatively fixed to the inner ring of the bearing, and the machine base is relatively fixed to the outer ring of the bearing.

Optionally, the driving mechanism drives the heating furnace body to rotate through a gear set or a transmission belt.

The beneficial effects of the present invention are: the processing technology can ensure that the preform is heated evenly along the circumferential direction by controlling the reciprocating rotation of the wire drawing furnace, thereby ensuring the drawing quality; Improve energy efficiency and improve the working environment.

Description of drawings:

Fig. 1 is the flow chart of the processing technology of optical fiber of the present invention;

Fig. 2 is the schematic diagram when drawing furnace works;

Fig. 3 is the enlarged view of place A in Fig. 2;

Fig. 4 is a structural schematic diagram of a copper telescopic sleeve;

Fig. 5 is a schematic diagram of the structure of the glass sleeve.

Each reference mark in the figure is:

1. Fixed seat, 2. Bearing, 3. Limit ring, 4. Water inlet pipe, 5. Preform rod, 6. Arc transition section, 7. Glass sleeve, 8. Copper telescopic sleeve, 9. Auxiliary rod, 10 , heating furnace body, 11, water outlet pipe, 12, driving mechanism, 13, reflective layer, 14, telescopic section, 15, second through hole, 16, cylindrical side wall, 17, first through hole, 18, cooling water cavity.

detailed description:

Below in conjunction with each accompanying drawing, the present invention is described in detail.

As shown in Figure 1, this embodiment discloses a process for processing an optical fiber, which includes the following steps:

1) Clamp the auxiliary rod with the chuck, control the lifting of the chuck, so that the lower part of the preform rod extends into the drawing furnace;

2) The wire drawing furnace is working, heating the preform, and at the same time controlling the reciprocating rotation of the wire drawing furnace;

3) The preform is melted and drawn down by its own gravity;

4) The drooping silk thread is first cooled and shaped by the shaping tube, and then further cooled by the cooling tube;

5) After the cooled optical fiber is coated and solidified, an optical fiber is obtained.

By controlling the reciprocating rotation of the drawing furnace, this processing technology can ensure that the preform is heated evenly along the circumferential direction, thereby ensuring the drawing quality.

As shown in Figures 2, 4 and 5, in this embodiment, the preform rod 5 and the auxiliary rod 9 in step 1) are integrated by flame welding, and the diameter of the preform rod 5 is greater than the diameter of the auxiliary rod 9, and the preform rod and the auxiliary rod 9 There is an arc-shaped transition section 6 between the auxiliary rods; before clamping the auxiliary rods with a chuck, first set a glass sleeve 7 on the arc-shaped transition section through the auxiliary rods, and then set the copper telescopic sleeve 8 On the auxiliary rod 9; the glass sleeve includes a bottom wall and a cylindrical side wall 16, the outer diameter of the cylindrical side wall of the glass sleeve is the same as the outer diameter of the preform rod, and the bottom wall of the glass sleeve has a hole for the auxiliary rod to pass through. The first through hole 17; one end of the copper telescopic sleeve 8 is closed, and one end of the copper sleeve 8 abuts against the upper surface of the glass sleeve 7, and the other end is closed and abuts against the upper surface of the auxiliary rod. The outer diameter of the cylindrical side wall of the glass sleeve is the same as that of the preform. This structure can prevent the gap between the preform and the inlet of the drawing furnace from becoming larger due to the arc-shaped transition section, resulting in a large amount of air entering the heating furnace; through The copper telescopic sleeve can not only reflect the light into the heating furnace, but also can adapt to auxiliary rods of various lengths.

As shown in FIG. 4 , in this embodiment, the copper telescopic tube 8 includes a plurality of telescopic segments 14 , wherein the uppermost telescopic segment has a second through hole 15 matching the process hole of the auxiliary rod.

As shown in FIG. 3 , in this embodiment, the inside of the glass sleeve 7 is filled with a reflective layer 13 , preferably the reflective layer can be made of metal. By setting the reflective layer, the light passing through the preform rod and the auxiliary rod can be reflected back, thereby improving the heating efficiency and improving the processing environment. .

As shown in Figure 2, in the present embodiment, the drawing furnace in step 2) includes:

Fixing seat 1;

Heating furnace body 10, the bottom is rotatably mounted on a fixed seat, and a cooling water chamber 18 is provided in the heating furnace body;

The driving mechanism 12 drives the heating furnace body to rotate back and forth along its own axis;

The water inlet pipe 4 passes through the heating furnace body and communicates with the lower part of the cooling water chamber 18;

The water outlet pipe 11 passes through the heating furnace body and communicates with the upper part of the cooling water cavity 18 .

In this embodiment, the outer wall of the heating furnace body 10 is provided with two limiting rings 3 for supporting the water pipe, one of which is located below the water inlet pipe, and the other is located below the water outlet pipe. By setting the limit ring, the winding of the water inlet pipe and the water outlet pipe can be facilitated, and the reliable reciprocating rotation of the heating furnace body can be ensured.

In this embodiment, the heating furnace body 10 cooperates with the fixed base 1 through the bearing 2, wherein the heating furnace is relatively fixed to the inner ring of the bearing, and the machine base is relatively fixed to the outer ring of the bearing.

In this embodiment, the driving mechanism 12 drives the heating furnace body to rotate through a gear set or a transmission belt.

The above is only a preferred embodiment of the present invention, and does not limit the scope of patent protection of the present invention. Any equivalent structural transformation made by using the description of the present invention and the contents of the accompanying drawings is directly or indirectly used in other related technical fields. All are equally included in the scope of protection of the present invention.

Claims (9)

1. the processing technique of an optical fiber, it is characterised in that comprise the following steps:

1) with chuck, auxiliary rod is clamped, control chuck lifting, make the bottom of prefabricated rods stretch in fiber drawing furnace；

2) fiber drawing furnace work, heats prefabricated rods, controls fiber drawing furnace reciprocating rotation simultaneously；

3) prefabricated rods melts, and relies on the sagging wire drawing of self gravitation；

4) sagging silk thread first passes through calibration tube cooling sizing, and the rear cooling tube that passes through cools down further；

5) optical fiber after cooling is coated and after curing process, obtains optical fiber.

2. the processing technique of optical fiber as claimed in claim 1, it is characterized in that, described step 1) in prefabricated rods and auxiliary rod be fused into one by flame, and the diameter of prefabricated rods is more than the diameter of auxiliary rod, has an arc-shaped transition section between prefabricated rods and auxiliary rod；Before auxiliary rod being clamped with chuck, first a glass sock is set in arc-shaped transition section by auxiliary rod, then copper telescopic is set on auxiliary rod；Described glass sock includes diapire and columned sidewall, and the external diameter of the columned sidewall of glass sock is identical with the external diameter of prefabricated rods, and the diapire of glass sock has first through hole passed for auxiliary rod；Described copper telescopic one end is closed, the upper surface of copper sleeve pipe one end and glass sock close against, the other end and with the upper surface of auxiliary rod against.

3. the processing technique of optical fiber as claimed in claim 2, it is characterised in that described copper telescoping tube includes multiple telescopic section, and wherein, the telescopic section of top side has second through hole suitable with auxiliary rod fabrication hole.

4. the processing technique of optical fiber as claimed in claim 2, it is characterised in that be filled with reflecting layer inside described glass sock.

5. the processing technique of optical fiber as claimed in claim 4, it is characterised in that described reflecting layer is made up of metal.

6. the processing technique of optical fiber as claimed in claim 1, it is characterised in that described step 2) in fiber drawing furnace include:

Fixing seat；

Heating furnace body, lower rotation is arranged on fixing seat, is provided with cooling water cavity in heating furnace body；

Drive mechanism, drives described heating furnace body to carry out back rotation along own axes direction；

Water inlet pipe, the bottom through heating furnace body with described cooling water cavity connects；

Outlet pipe, the top through heating furnace body with described cooling water cavity connects.

7. the processing technique of optical fiber as claimed in claim 6, it is characterised in that the lateral wall of described heating furnace body is provided with two and is positioned at the lower section of water inlet pipe for the spacing ring supporting water pipe, one of them spacing ring, and another spacing ring is positioned at the lower section of outlet pipe.

8. the processing technique of optical fiber as claimed in claim 6, it is characterised in that described heating furnace body is coordinated with fixing seat by bearing, and wherein, heating furnace is relatively fixed with the inner ring of bearing, and support is relatively fixed with the outer ring of bearing.

9. the processing technique of optical fiber as claimed in claim 6, it is characterised in that described drive mechanism drives heating furnace body to rotate by gear train or transmission band.