阅读说明：本技术 一种光纤预制棒高温换棒装置 (Optical fiber perform high temperature rod changing device ) 是由 张太垒 沈国锋 臧新发 李长通 顾单元 王君辉 郭浩林 于 2020-05-25 设计创作，主要内容包括：本发明公开了一种光纤预制棒高温换棒装置,包括拉丝炉、上炉气封装置以及下炉口密封装置,上炉气封装置位于拉丝炉上炉口并与拉丝炉的加热炉相连接,下炉口密封装置连接在拉丝炉的下炉口,上炉气封装置的内部下侧设置有上层空腔结构以及下层空腔结构,上炉气封装置的上端设置有顶部保温管；本发明解决了拉丝炉高温换棒过程中氧化石墨件问题,这种装置分为拉丝炉下口密封装置、安装在拉丝炉口上气封装置以及与气封装置相连接的顶部保温管,气封装置连接氩气或氮气,气封装置内通有冷却水对气封装置进行保护,使用该装置能有效避免换棒过程中空气进入拉丝炉内,在不降温的情况下进行换棒,提高生产效率。(The invention discloses a high-temperature rod changing device for an optical fiber preform, which comprises a wire drawing furnace, an upper furnace gas sealing device and a lower furnace mouth sealing device, wherein the upper furnace gas sealing device is positioned at an upper furnace mouth of the wire drawing furnace and is connected with a heating furnace of the wire drawing furnace; the device comprises a lower port sealing device of the wire drawing furnace, an air sealing device arranged on the upper port of the wire drawing furnace and a top heat preservation pipe connected with the air sealing device, wherein the air sealing device is connected with argon or nitrogen, and cooling water is introduced into the air sealing device to protect the air sealing device.)

1. The utility model provides an optical fiber perform high temperature rod changing device, includes wire drawing stove, last stove atmoseal device and lower furnace mouth sealing device, its characterized in that: the upper furnace gas sealing device is positioned at an upper furnace mouth of the wire drawing furnace and is connected with a heating furnace of the wire drawing furnace, the lower furnace mouth sealing device is connected with a lower furnace mouth of the wire drawing furnace, an upper layer cavity structure and a lower layer cavity structure are arranged at the lower side inside the upper furnace gas sealing device, the lower layer cavity structure is positioned below the upper layer cavity structure, the lower layer cavity structure is connected with a cooling water inlet hole I and a cooling water inlet hole II, the upper layer cavity structure is connected with an inert gas inlet hole, the inner wall of the upper furnace gas sealing device is provided with a row of continuous gas outlet holes, the upper end of the upper furnace gas sealing device is provided with a top heat preservation pipe, the top heat preservation pipe and the upper furnace gas sealing device are fixedly connected through a connecting bolt, the top of the top heat preservation pipe is provided with a quartz cover plate, an optical fiber perform hanging rod is arranged above the top heat preservation pipe, and the lower end of the optical, the lower furnace mouth sealing device comprises a rotatable sealing cover plate, and the sealing cover plate is fixed at the lower furnace mouth through a plurality of fixing screws.

2. An optical fiber preform rod changing apparatus according to claim 1, wherein: the inner diameter of the upper furnace gas seal device is the same as that of the wire drawing furnace.

3. An optical fiber preform rod changing apparatus according to claim 1, wherein: the upper cavity structure is filled with inert gas in use.

4. An optical fiber preform rod changing apparatus according to claim 1, wherein: the lower cavity structure is filled with cooling water when in use.

5. An optical fiber preform rod changing apparatus according to claim 1, wherein: when in use, the cooling water inlet hole I is always filled with cooling water with the temperature of 18-28 ℃ and the pressure of 4.0-4.5 bar.

6. An optical fiber preform rod changing apparatus according to claim 1, wherein: the venthole is the gas pocket of diameter 1mm, and the distance between the gas pocket is 1 mm.

7. An optical fiber preform rod changing apparatus according to claim 1, wherein: the top heat preservation pipe is made of stainless steel, and the inner diameter and the outer diameter of the top heat preservation pipe are the same as those of the upper furnace mouth air sealing device.

8. An optical fiber preform rod changing apparatus according to claim 1, wherein: the bottom of optical fiber perform peg is the peg coupler, and the material is silicon nitride, and the peg coupler passes through the bolt and the optical fiber perform of silicon nitride material and is connected.

9. An optical fiber preform rod changing apparatus according to claim 1, wherein: the sealing cover plate is made of stainless steel.

10. An optical fiber preform rod changing apparatus according to claim 1, wherein: and a graphite felt is used for sealing between the quartz cover plate and the optical fiber perform rod.

Technical Field

The invention relates to the technical field of optical fiber drawing, in particular to a high-temperature rod changing device for an optical fiber preform.

Background

The optical fiber is formed by heating and softening an optical fiber pre-supporting rod in an optical fiber drawing furnace, wherein the temperature in the drawing furnace is up to 2000 ℃ in the drawing process, in order to prevent a graphite heating body material in the drawing furnace from being oxidized, inert gas needs to be kept in the drawing furnace, helium and argon mixed gas is generally introduced as protective gas, a gap between a prefabricated rod and a drawing furnace opening in the drawing process is sealed by a quartz piece and quartz cotton, under the normal condition, when the optical fiber prefabricated rod is drawn and needs to be replaced, the drawing furnace is cooled firstly, the rod replacement operation is carried out after the drawing furnace is fully cooled, the required time of the whole cooling process is longer, the production efficiency is influenced, the production cost is increased, if the drawing furnace is used for replacing the rod under the condition of not cooling, the upper opening and the lower opening of the drawing furnace are in an open state when the prefabricated rod is replaced, air forms convection at the upper opening and the lower opening of the drawing, causing the scrapping of the graphite piece of the wire drawing furnace.

Patent CN201220086749.9 describes a quartz seal for preform drawing for achieving a gas seal when the preform is drawn into a drawing furnace. And clamping the quartz cup at the welding position of the prefabricated rod and the tail pipe. Along with the tail pipe slowly enters the wire drawing furnace, the quartz cup is contacted with the furnace cover plate and is tightly connected, so that the air sealing effect is realized, the external air is prevented from entering the wire drawing furnace, and the oxidation of the graphite piece is prevented. The method mentioned in the patent can protect the graphite piece when the preform rod is fed, but the method can not realize rod replacement at high temperature, and the rod replacement operation is carried out by cooling the drawing furnace in a quartz cup mode.

Patent CN201020119339.0 mentions a rod changing device of a hot furnace of an optical fiber drawing furnace, so that the drawing furnace completes the replacement of the optical fiber preform without stopping the furnace. An isolation sleeve is connected with a drawing furnace top cover, a gas blowing pipe in the isolation sleeve blows nitrogen inwards to form a gas seal, and an expansion plug is used for plugging and sealing the bottom opening of an annealing pipe of the drawing furnace to prevent air from entering. The method can realize rod replacement at high temperature, but the rod replacement needs to continuously use nitrogen with larger flow for gas sealing, and particularly for optical fiber preforms with larger sizes, the preform needs to continuously introduce nitrogen with large flow to realize gas sealing in the process of lifting out a furnace mouth for rod replacement because the furnace mouth has larger size. The sealing test glass piece of the cutting and drawing furnace mouth and the quartz wool sealing easily cause the phenomenon of air leakage in the drawing production process of the prefabricated rod with uneven diameter, so that the method is difficult to realize complete air sealing for rod replacement of the large-size optical fiber prefabricated rod and easily causes the oxidation of a graphite piece in a furnace.

Disclosure of Invention

The invention aims to provide a high-temperature rod replacing device for an optical fiber preform rod.

In order to achieve the purpose, the technical scheme adopted by the invention is as follows: a high-temperature rod replacing device for an optical fiber preform comprises a drawing furnace, an upper furnace gas sealing device and a lower furnace mouth sealing device, wherein the upper furnace gas sealing device is positioned at an upper furnace mouth of the drawing furnace and is connected with a heating furnace of the drawing furnace, the lower furnace mouth sealing device is connected with a lower furnace mouth of the drawing furnace, an upper cavity structure and a lower cavity structure are arranged at the lower side inside the upper furnace gas sealing device, the lower cavity structure is positioned below the upper cavity structure, the lower cavity structure is connected with a cooling water inlet hole I and a cooling water inlet hole II, the upper cavity structure is connected with an inert gas inlet hole, a row of continuous gas outlet holes are formed in the inner wall of the upper furnace gas sealing device, a top heat-preserving pipe is arranged at the upper end of the upper furnace gas sealing device, the top heat-preserving pipe and the upper furnace gas sealing device are fixedly connected through a connecting bolt, a quartz cover plate is arranged at the top of the top, the top of top insulating tube is provided with the optical fiber perform peg, the middle part of quartz cover plate is passed to the lower extreme of optical fiber perform peg, lower furnace mouth sealing device includes rotatable sealed apron, sealed apron is fixed in lower furnace mouth department through a plurality of fixed screws.

Preferably, the inner diameter of the upper furnace gas sealing device is the same as that of the wire drawing furnace.

Preferably, the upper cavity structure is filled with an inert gas in use.

Preferably, the lower cavity structure is filled with cooling water in use.

Preferably, the cooling water inlet hole I is always filled with cooling water with the temperature of 18-28 ℃ and the pressure of 4.0-4.5bar when in use.

Preferably, the air outlet is an air hole with the diameter of 1mm, and the distance between the air holes is 1 mm.

Preferably, the top heat preservation pipe is made of stainless steel, and the inner diameter and the outer diameter of the top heat preservation pipe are the same as those of the upper furnace mouth air sealing device.

Preferably, the bottom of the optical fiber perform rod is a rod coupler made of silicon nitride, and the rod coupler is connected with the optical fiber perform rod through a plug made of the silicon nitride.

Preferably, the sealing cover plate is made of stainless steel.

Preferably, the quartz cover plate and the optical fiber perform rod are sealed by a graphite felt.

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

the invention provides a high-temperature rod replacing device for an optical fiber preform rod, particularly a large-size optical fiber preform rod, which solves the problem of graphite oxide parts in the high-temperature rod replacing process of a drawing furnace.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.

FIG. 1 is a block diagram of the present invention;

FIG. 2 is an enlarged view of the structure at A in FIG. 1 according to the present invention;

FIG. 3 is an enlarged view of the structure at B in FIG. 1 according to the present invention;

FIG. 4 is a side cross-sectional view of the structure of the present invention;

fig. 5 is an enlarged view of the structure at C in fig. 4 according to the present invention.

In the figure: the device comprises a wire drawing furnace 1, an upper furnace gas seal device 2, a top heat preservation pipe 3, an optical fiber perform rod hanging 4, a lower furnace mouth sealing device 5, an upper layer cavity structure 6, a lower layer cavity structure 7, a sealing cover plate 8, a cooling water inlet hole I9, a cooling water inlet hole II10, an inert gas inlet hole 11, an air outlet hole 12, a fixing screw 13, a quartz cover plate 14, a connecting bolt 15 and a bolt 16.

Detailed Description

The preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings so that the advantages and features of the present invention can be more easily understood by those skilled in the art, and the scope of the present invention will be more clearly and clearly defined.

Referring to fig. 1-5, the invention provides a high-temperature rod changing device for an optical fiber preform, which comprises a wire-drawing furnace 1, an upper furnace gas sealing device 2 and a lower furnace opening sealing device 5, wherein the upper furnace gas sealing device 2 is positioned at an upper furnace opening of the wire-drawing furnace 1 and is connected with a heating furnace of the wire-drawing furnace 1, the inner diameter of the upper furnace gas sealing device 2 is the same as that of the wire-drawing furnace, the upper furnace gas sealing device 2 is made of stainless steel as a main body, the lower furnace opening sealing device 5 is connected with the lower furnace opening of the wire-drawing furnace 1, an upper layer cavity structure 6 and a lower layer cavity structure 7 are arranged at the lower side in the upper furnace gas sealing device 2, the lower layer cavity structure 7 is positioned below the upper layer cavity structure 6, the lower layer cavity structure 7 is connected with a cooling water inlet hole I9 and a cooling water inlet hole II10, cooling water is always introduced into the cooling water inlet hole I9 at the temperature of 18-28 ℃, the cooling water is pure water, the lower cavity structure 7 is filled with cooling water when in use, the upper cavity structure 6 is connected with an inert gas inlet hole 11, the upper cavity structure 6 is filled with inert gas through the inert gas inlet hole 11 when in use, the inner wall of the upper furnace gas sealing device 2 is provided with a row of continuous gas outlet holes 12, the gas outlet holes 12 are gas holes with the diameter of 1mm, the distance between the gas holes is 1mm, and the gas holes are used for discharging gas, the upper end of the upper furnace gas sealing device 2 is provided with a top heat preservation pipe 3, the top heat preservation pipe 3 and the upper furnace gas sealing device 2 are fixedly connected through a connecting bolt 15, the top heat preservation pipe 3 is made of stainless steel, the inner diameter and the outer diameter of the top heat preservation pipe are the same as the inner diameter and the outer diameter of the upper furnace gas sealing device 2, the length of the top heat preservation pipe 3 is slightly longer than that of the drawn optical fiber preform hanging rod 4, the top heat preservation pipe, the length of the hanging rod 4 of the optical fiber preform rod can be adjusted; a quartz cover plate 14 is arranged at the top of the top heat-insulating tube 3, an optical fiber perform hanging rod 4 is arranged above the top heat-insulating tube 3, the lower end of the optical fiber perform hanging rod 4 penetrates through the middle of the quartz cover plate 14, a hanging rod coupler is arranged at the bottom of the optical fiber perform hanging rod 4 and made of silicon nitride, the hanging rod coupler is connected with the optical fiber perform through a plug pin 16 made of silicon nitride, a graphite felt is adopted between the quartz cover plate 14 and the optical fiber perform hanging rod 4 for sealing, the quartz cover plate 14 is sleeved on the optical fiber perform hanging rod 4, and when the prefabricated rod is sent into a furnace body by the hanging rod, the quartz cover plate 14 is clamped at the top of the heat-insulating furnace; lower furnace mouth sealing device 5 is including rotatable sealed apron 8, and sealed apron 8 is stainless steel, and sealed apron 8 is fixed in lower furnace mouth department through a plurality of fixed screws 13.

The working principle is as follows: when the rod is replaced, the lower furnace mouth is blocked by the lower furnace mouth sealing device 5 and fastened by the fixing screw 13, the air sealing gas is opened, an air film is formed at the furnace mouth, the air in the top heat preservation pipe 3 is exhausted by the air sealing gas, then the optical fiber perform hanging rod 4 is lifted up slowly, when the optical fiber perform hanging rod 4 is lifted to the upper end position of the heat preservation pipe, the quartz cover plate 14 is clamped on the coupler of the optical fiber perform hanging rod 4 and lifted up along with the optical fiber perform hanging rod 4, and after the optical fiber perform hanging rod 4 is completely lifted up, the upper mouth of the top heat preservation pipe 3 is covered by the quartz cover plate 14 or the stainless steel cover plate; after the rod is changed, take off the quartz cover plate 14 or the stainless steel apron of the 3 suitable orificial tops of top insulating tube, send into the top insulating tube 3 with optical fiber perform peg 4, when optical fiber perform peg 4 got into the top insulating tube 3 completely, quartz cover plate 14 card on the jack catch coupler is in the 3 suitable orificial top of top insulating tube, continue to send optical fiber perform peg 4 downwards, until sending into wire drawing furnace 1, seal the gap between optical fiber perform peg 4 and quartz cover plate 14 with the graphite felt, open 1 suitable orificial bottom of wire drawing furnace mouth sealing device 5 of wire drawing furnace, the whole rod changing process is accomplished, the device is applicable to arbitrary size wire drawing furnace.

Although the embodiments of the present invention have been described with reference to the accompanying drawings, various changes or modifications may be made by the patentees within the scope of the appended claims, and within the scope of the invention, as long as they do not exceed the scope of the invention described in the claims.