阅读说明：本技术 一种拉丝炉与退火炉密封结构及拉丝装置 (Sealing structure of wire drawing furnace and annealing furnace and wire drawing device ) 是由 管弘丰 黄健伟 曹少波 姚晓峰 董魏 罗干 顾灵卫 曹兴辉 宋君 朱永刚 陈伟 于 2019-12-16 设计创作，主要内容包括：本发明涉及石英光纤制造技术领域,具体公开了一种拉丝炉与退火炉密封结构及拉丝装置。该拉丝炉与退火炉密封结构设置于退火炉的入口和拉丝炉的出口之间,包括：延伸管,包括能够开合的第一半管和第二半管,第一半管包括第一通槽,第二半管包括第二通槽,第一半管和第二半管扣合后,第一通槽和第二通槽形成与拉丝炉和退火炉连通的通道；延伸管的上端套设在拉丝炉的出口外,下端套设于退火炉的入口外。本发明提供的拉丝炉与退火炉密封结构设置于退火炉的入口和拉丝炉的出口之间,以避免外界空气由退火炉和拉丝炉之间的间隙进入拉丝炉下部,提高拉丝炉下部温度的均匀性与层流的稳定性,降低裸光纤直径波动幅度。(The invention relates to the technical field of quartz optical fiber manufacturing, and particularly discloses a sealing structure of a wire drawing furnace and an annealing furnace and a wire drawing device. This wire drawing furnace and annealing stove seal structure sets up between the export of the entry of annealing stove and wire drawing furnace, includes: the extension pipe comprises a first half pipe and a second half pipe which can be opened and closed, the first half pipe comprises a first through groove, the second half pipe comprises a second through groove, and after the first half pipe and the second half pipe are buckled, the first through groove and the second through groove form a channel communicated with the wire drawing furnace and the annealing furnace; the upper end of the extension pipe is sleeved outside the outlet of the wire drawing furnace, and the lower end of the extension pipe is sleeved outside the inlet of the annealing furnace. The sealing structure of the wire-drawing furnace and the annealing furnace is arranged between the inlet of the annealing furnace and the outlet of the wire-drawing furnace, so that the external air is prevented from entering the lower part of the wire-drawing furnace from the gap between the annealing furnace and the wire-drawing furnace, the temperature uniformity and the laminar flow stability of the lower part of the wire-drawing furnace are improved, and the diameter fluctuation range of a bare optical fiber is reduced.)

1. A sealing structure for a wire drawing furnace and an annealing furnace, characterized by being provided between an inlet (201) of the annealing furnace (20) and an outlet (101) of the wire drawing furnace (10), and comprising:

the extension pipe comprises a first half pipe (1) and a second half pipe (2) which can be opened and closed, the first half pipe (1) comprises a first through groove (11), the second half pipe (2) comprises a second through groove (12), and after the first half pipe (1) and the second half pipe (2) are buckled, the first through groove (11) and the second through groove (12) form a channel communicated with the wire drawing furnace (10) and the annealing furnace (20); the upper end of the extension pipe is sleeved outside the outlet (101) of the wire drawing furnace (10), and the lower end of the extension pipe is sleeved outside the inlet (201) of the annealing furnace (20).

2. The sealing structure of a drawing furnace and an annealing furnace according to claim 1, characterized in that one side of the first half-pipe (1) and the second half-pipe (2) are hinged.

3. The sealing structure for a drawing furnace and an annealing furnace according to claim 1, characterized in that the first half-pipe (1) and the second half-pipe (2) each comprise a graphite inner bushing (4) and an outer shell (3) arranged outside the graphite inner bushing (4).

4. The sealing structure of the wire drawing furnace and the annealing furnace according to claim 3, characterized in that the graphite inner bushing (4) comprises an inner bushing body (42) and an inner connecting part arranged at the upper end of the inner bushing body (42); the shell (3) comprises a shell body and an outer connecting part arranged at the upper end of the shell body, and the graphite inner bushing (4) is connected with the shell (3) through the inner connecting part and the outer connecting part.

5. The sealing structure of a drawing furnace and an annealing furnace according to claim 4, characterized in that the inner connecting portion is one of a groove and a projection (41), the outer connecting portion is the other of the groove and the projection (41), and the projection (41) is insertable into the groove.

6. The sealing structure for a drawing furnace and an annealing furnace according to claim 4, characterized in that the outer shell body is arranged at a distance from the inner bushing body (42).

7. The sealing structure of the wire drawing furnace and the annealing furnace according to claim 2, characterized in that the sealing structure of the wire drawing furnace and the annealing furnace further comprises a driving member, an output end of the driving member is connected with the first half-pipe (1) and is used for driving the other side of the first half-pipe (1) to be close to or far away from the other side of the second half-pipe (2) so as to open and close the first half-pipe (1) and the second half-pipe (2).

8. The sealing structure of a drawing furnace and an annealing furnace according to claim 3, characterized in that it further comprises a support assembly connected to the second half-pipe (2) so that the second half-pipe (2) is located between the inlet (201) of the annealing furnace (20) and the outlet (101) of the drawing furnace (10).

9. The sealing structure for a drawing furnace and an annealing furnace according to claim 8, wherein the support assembly comprises:

a support;

the connecting rod (5), the one end of connecting rod (5) connect in shell (3), the other end connect in the support.

10. A drawing apparatus, characterized by comprising a drawing furnace (10), a sealing structure of the drawing furnace and an annealing furnace according to any one of claims 1 to 9, and an annealing furnace (20) connected in sequence from top to bottom.

Technical Field

The invention relates to the technical field of quartz optical fiber manufacturing, in particular to a sealing structure of a wire drawing furnace and an annealing furnace and a wire drawing device.

Background

High speed drawing of optical fibers is an effective way to increase the production efficiency of optical fiber products and to reduce the production cost of optical fibers. The position of the preform changing in the drawing furnace moves downwards along with the increase of the drawing speed, and the higher the drawing speed is, the larger the distance of the downward movement of the position of the conical head changing in the drawing furnace is, so that the position of the optical fiber forming is positioned below the heating zone of the drawing furnace. For example, in a low-speed drawing state of 1000m/min or less, the optical fiber is formed in a heating zone of a drawing furnace. The temperature and airflow state of the heating zone of the drawing furnace are the most stable. The fiber was drawn at a speed of 2000m/min and the fiber was finally shaped in a muffle tube. Because the muffle tube does not generate heat, a temperature field in the muffle tube is formed by air flow convection and heat radiation exchange between the heating area and the muffle tube. The temperature uniformity and flow stability in the muffle tube are inferior to those of the heating zone.

The optical fiber drawing annealing process can effectively solve the problem of internal stress of the optical fiber. The annealing furnace is arranged below the wire drawing furnace. The distance of about 40cm needs to be reserved between the inlet of the annealing furnace and the outlet of the wire drawing furnace, so that the optical fiber in the wire drawing furnace can be observed in the wire drawing process, and the optical fiber can be conveniently operated to penetrate into the annealing furnace through the wire drawing furnace.

However, the gap between the annealing furnace and the lower side of the drawing furnace causes air to flow into the lower portion of the drawing furnace (including the muffle tube), which further causes the nonuniformity of the internal temperature field and the turbulence of the laminar flow to be intensified, resulting in an increase in the fluctuation width of the diameter of the bare optical fiber. The fluctuation of the outer diameter of the optical fiber can cause the fluctuation of the core diameter and the mode field diameter, so that the scattering loss of the optical fiber, the increase of the connection loss, the reduction of the strength and other parameters are deteriorated, and the optical fiber communication transmission is obviously influenced.

Disclosure of Invention

The invention aims to provide a sealing structure of a wire drawing furnace and an annealing furnace, which aims to improve the temperature uniformity and the laminar flow stability of the lower part of the wire drawing furnace and reduce the diameter fluctuation range of a bare optical fiber.

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

a sealing structure of a wire drawing furnace and an annealing furnace is arranged between an inlet of the annealing furnace and an outlet of the wire drawing furnace, and comprises:

the extension pipe comprises a first half pipe and a second half pipe which can be opened and closed, the first half pipe comprises a first through groove, the second half pipe comprises a second through groove, and after the first half pipe and the second half pipe are buckled, the first through groove and the second through groove form a channel communicated with the wire drawing furnace and the annealing furnace; the upper end of the extension pipe is sleeved outside the outlet of the wire drawing furnace, and the lower end of the extension pipe is sleeved outside the inlet of the annealing furnace.

Preferably, one side of the first half pipe and one side of the second half pipe are hinged.

Preferably, the first half pipe and the second half pipe each comprise a graphite inner bushing and an outer shell arranged outside the graphite inner bushing.

Preferably, the graphite inner bushing comprises an inner bushing body and an inner connecting part arranged at the upper end of the inner bushing body; the shell comprises a shell body and an outer connecting part arranged at the upper end of the shell body, and the graphite inner bushing and the shell are connected through the inner connecting part and the outer connecting part.

Preferably, the inner connecting portion is one of a groove and a protrusion, the outer connecting portion is the other of the groove and the protrusion, and the protrusion can be inserted into the groove.

Preferably, the outer shell body and the inner bushing body are arranged at a distance.

Preferably, the sealing structure of the wire drawing furnace and the annealing furnace further comprises a driving piece, wherein the output end of the driving piece is connected with the first half pipe and used for driving the other side of the first half pipe to be close to or far away from the other side of the second half pipe so as to open and close the first half pipe and the second half pipe.

Preferably, the sealing structure of the wire drawing furnace and the annealing furnace further comprises a support assembly connected to the second half pipe so that the second half pipe is located between the inlet of the annealing furnace and the outlet of the wire drawing furnace.

Preferably, the support assembly comprises:

a support;

and one end of the connecting rod is connected with the shell, and the other end of the connecting rod is connected with the bracket.

The wire drawing device comprises a wire drawing furnace, the sealing structure of the wire drawing furnace and an annealing furnace and the annealing furnace, which are sequentially connected from top to bottom.

The invention has the beneficial effects that: the sealing structure of the wire-drawing furnace and the annealing furnace is arranged between the inlet of the annealing furnace and the outlet of the wire-drawing furnace, so that the external air is prevented from entering the lower part of the wire-drawing furnace from the gap between the annealing furnace and the wire-drawing furnace, the temperature uniformity and the laminar flow stability of the lower part of the wire-drawing furnace are improved, and the diameter fluctuation range of a bare optical fiber is reduced. When the one end of light is penetrated the annealing stove or is observed the optic fibre in the wire drawing stove as needs, open first half pipe and second half pipe, under other circumstances, first half pipe and the half pipe lock of second, consequently, neither need influence the operator and observe and operate, also can prevent effectively that outside air from getting into in annealing stove and the wire drawing stove.

Drawings

FIG. 1 is a schematic structural view of a drawing apparatus provided in an embodiment of the present invention;

FIG. 2 is a cross-sectional view of a sealing structure of a wire drawing furnace and an annealing furnace provided in an embodiment of the present invention;

fig. 3 is a schematic structural diagram of a sealing structure of a wire drawing furnace and an annealing furnace according to an embodiment of the present invention.

In the figure:

10. a wire drawing furnace; 101. an outlet;

20. an annealing furnace; 201. an inlet;

30. the sealing structure of the wire drawing furnace and the annealing furnace;

1. a first half pipe; 11. a first through groove; 12. a second through groove;

2. a second half pipe; 3. a housing;

4. a graphite inner liner; 41. a protrusion; 411. a first part; 412. a second section; 42. an inner liner body;

5. a connecting rod.

Detailed Description

The technical scheme of the invention is further explained by the specific implementation mode in combination with the attached drawings. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some but not all of the elements associated with the present invention are shown in the drawings.

In the present invention, the directional terms such as "upper", "lower", "left", "right", "inner" and "outer" are used for easy understanding without making a contrary explanation, and thus do not limit the scope of the present invention.

In the present invention, unless otherwise expressly stated or limited, "above" or "below" a first feature means that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact with each other via another feature therebetween. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.

In the description of the present invention, unless expressly stated or limited otherwise, the terms "connected," "connected," and "fixed" are to be construed broadly, e.g., as meaning permanently connected, removably connected, or integral to one another; 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 in specific cases to those skilled in the art.

As shown in fig. 1 and fig. 2, the sealing structure 30 for a drawing furnace and an annealing furnace provided in this embodiment is disposed between the inlet 201 of the annealing furnace 20 and the outlet 101 of the drawing furnace 10, so as to prevent outside air from entering the lower portion of the drawing furnace 10 through the gap between the annealing furnace 20 and the drawing furnace 10, improve the temperature uniformity and laminar flow stability at the lower portion of the drawing furnace 10, and reduce the diameter fluctuation range of bare fibers. In addition, the sealing structure 30 for the wire drawing furnace and the annealing furnace provided by the embodiment can prevent outside air from entering the upper part of the annealing furnace 20, and improve the stability of the temperature in the annealing furnace 20.

The sealing structure 30 for the wire-drawing furnace and the annealing furnace comprises an extension pipe, wherein the upper end of the extension pipe is sleeved outside the outlet 101 of the wire-drawing furnace 10, and the lower end of the extension pipe is sleeved outside the inlet 201 of the annealing furnace 20. The extension pipe is including the first half pipe 1 and the second half pipe 2 that can open and shut, and first half pipe 1 includes first logical groove 11, and second half pipe 2 includes second logical groove 12, and first half pipe 1 and second half pipe 2 lock back, first logical groove 11 and second logical groove 12 form with the passageway of wire drawing stove 10 and annealing stove 20 intercommunication, and optic fibre is passed through in the passageway gets into annealing stove 20 by wire drawing stove 10. When one end of light needs to be penetrated into the annealing furnace 20 or the optical fiber in the drawing furnace 10 is observed from the drawing furnace 10, the first half pipe 1 and the second half pipe 2 are opened, and under other conditions, the first half pipe 1 and the second half pipe 2 are buckled to prevent outside air from entering the annealing furnace 20 and the drawing furnace 10.

In this embodiment, the extension pipe has a cylindrical structure with an upper opening and a lower opening, and the first half pipe 1 and the second half pipe 2 have the same structure and are fastened to form a cylindrical structure. Of course, in other embodiments, the extension pipe may have a cylindrical structure with a rectangular cross section, so long as it conforms to the shape of the outlet 101 of the drawing furnace 10 and the inlet 201 of the annealing furnace 20.

The first half-pipe 1 and the second half-pipe 2 both comprise a graphite inner liner 4 and a shell 3 arranged outside the graphite inner liner 4. The graphite inner bushing 4 has high temperature resistance and high stability, and can avoid polluting optical fibers and avoid the inner bushing from losing efficacy in a high-temperature environment for a long time. Preferably, the shell 3 is made of metal, so that the strength of the first half pipe 1 and the second half pipe 2 can be improved, and the failure of the extension pipe caused by external collision is avoided.

Preferably, the graphite inner bushing 4 includes an inner bushing body 42 and an inner connection part disposed at an upper end of the inner bushing body 42; the shell 3 comprises a shell body and an outer connecting part arranged at the upper end of the shell body, and the graphite inner bushing 4 is connected with the shell 3 through the inner connecting part and the outer connecting part.

The inner connecting part is a protrusion 41, the outer connecting part is a groove, and the protrusion 41 can be inserted into the groove. Further, the protrusion 41 and the groove are each a semi-annular structure. The protrusion 41 is a first portion 411 and a second portion 412 connected in an L-shaped structure, one end of the first portion 411 is connected to the upper end of the graphite inner liner 4, the other end is connected to the second portion 412, and the second portion 412 extends downward. The opening of the groove faces, the second part 412 is inserted into the groove, and the graphite inner bushing 4 and the shell 3 are connected in a hanging mode. Of course, in other embodiments, the inner connecting portion may be a groove, and the outer connecting portion may be a protrusion 41.

In other embodiments, the graphite inner bushing 4 and the outer casing 3 may be connected by a graphite bolt and a nut, the nut of the graphite bolt is located in the first through groove 11 or the second through groove 12, and the nut may be made of graphite or metal and located outside the outer casing 3.

To improve the thermal insulation of the extension pipe, the outer shell body and the inner liner body 42 are spaced apart.

To facilitate the opening and closing of the first half pipe 1 and the second half pipe 2, one side of the first half pipe 1 and the second half pipe 2 is hinged.

The furnace-to-lehr sealing arrangement 30 further comprises a support assembly connected to the second half-pipe 2 such that the second half-pipe 2 is located between the inlet 201 of the lehr 20 and the outlet 101 of the furnace 10. When first half pipe 1 and second half pipe 2 are opening, second half pipe 2 is supported by the supporting component, and second half pipe 2 is articulated with first half pipe 1, therefore, the staff need not take off first half pipe 1 and second half pipe 2, is convenient for extend the use of pipe.

As shown in fig. 3, the support assembly preferably comprises a support, which may be a drawing tower of the drawing apparatus itself, and a connecting rod 5, one end of which is connected to the housing 3 of the second half-pipe 2 and the other end is connected to the support.

Of course, in other embodiments, the second half pipe 2, which may also be an extension pipe, is connected to at least one of the annealing furnace 20 and the drawing furnace 10 by a connector such as a bolt, thereby fixing the extension pipe. The first half pipe 1 and the second half pipe 2 may not be connected to the drawing furnace 10 and the annealing furnace 20, and when the first half pipe 1 and the second half pipe 2 are engaged, the extension pipe is confined between the outlet 101 of the drawing furnace 10 and the inlet 201 of the annealing furnace 20, and when the first half pipe 1 and the second half pipe 2 are opened, the first half pipe 1 and the second half pipe 2 are removed.

In order to realize the automatic opening and closing of the first half-pipe 1 and the second half-pipe 2, the sealing structure 30 of the drawing furnace and the annealing furnace further comprises a driving member (not shown in the figure), an output end of the driving member is connected with the first half-pipe 1, and the driving member is used for driving the other side of the first half-pipe 1 to be close to or far away from the other side of the second half-pipe 2 so as to open and close the first half-pipe 1 and the second half-pipe 2. The driving piece can be an air cylinder or an oil cylinder, a piston rod of the air cylinder or the oil cylinder is connected with the first half pipe 1, the piston rod extends out, the first half pipe 1 is buckled on the second half pipe 2, the piston rod contracts, and the first half pipe 1 opens the second half pipe 2. The cylinder of the drive element can be fixed to the bracket or to the housing 3 of the second half-pipe 2.

Of course, in other embodiments, the other side of the first half-pipe 1 and the second half-pipe 2 may be provided with an ear plate, and the two ear plates are connected by a lock. Two otic placodes are connected to the lock and the lock of first half pipe 1 and second half pipe 2 is realized, takes off the lock, opens first half pipe 1 and second half pipe 2.

The extension pipe that this embodiment provided is closed back, can guarantee on the one hand that optic fibre does not contact with external environment under the high temperature state at the wire drawing in-process, has reduced the cooling rate of wire drawing in-process optic fibre, and this device of on the other hand is high with the export of wire drawing stove and the entry adaptation degree of annealing stove, and its gap is little, can effectually avoid outside air and wire drawing stove can gaseous convection current that forms, avoids destroying the laminar flow state of air current in the wire drawing stove.

The embodiment also provides a wire drawing device, which comprises a wire drawing furnace 10, a sealing structure 30 of the wire drawing furnace and an annealing furnace 20 which are sequentially connected from top to bottom.

It should be understood that the above-described embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.