阅读说明：本技术 一种用于光纤预制棒拉丝的工装及其使用方法 (Tool for drawing optical fiber preform and using method thereof ) 是由 陈宏达 周莉 谭强 罗詠淋 眭立洪 刘延辉 于 2021-11-06 设计创作，主要内容包括：本发明揭示了一种用于光纤预制棒拉丝的工装及其使用方法。所述工装包括转接尾柄、套筒垫块、套筒调整片及气封套筒,转接尾柄的一端连接尾柄,转接尾柄的另一端连接光纤拉丝设备的进棒机构；套筒垫块安装于尾柄与尾端疏松体的转接处；套筒调整片设置于套筒垫块上；气封套筒设置于套筒调整片上,并经由所述套筒调整片调整与所述光纤预制棒的相对位置；其中,所述气封套筒的内径直径小于所述光纤预制棒本体的直径,所述气封套筒的外径直径大于所述光纤预制棒本体的直径。本发明的拉丝工装在光纤预制棒拉丝末期解决了疏松体变径导致的气封难以密封的结构问题,提供了安全可靠的解决方案,并能够保证产品质量的稳定,提高产量和合格率。(The invention discloses a tool for drawing an optical fiber preform rod and a using method thereof. The tool comprises a switching tail handle, a sleeve cushion block, a sleeve adjusting sheet and an air seal sleeve, wherein one end of the switching tail handle is connected with the tail handle, and the other end of the switching tail handle is connected with a rod feeding mechanism of the optical fiber drawing equipment; the sleeve cushion block is arranged at the joint of the tail handle and the tail end loose body; the sleeve adjusting sheet is arranged on the sleeve cushion block; the gas seal sleeve is arranged on the sleeve adjusting sheet and is adjusted to the relative position of the optical fiber preform rod through the sleeve adjusting sheet; wherein the inner diameter of the gas seal sleeve is smaller than the diameter of the optical fiber preform body, and the outer diameter of the gas seal sleeve is larger than the diameter of the optical fiber preform body. The drawing tool solves the structural problem that the air seal is difficult to seal caused by the diameter change of the loose body in the final drawing stage of the optical fiber preform, provides a safe and reliable solution, can ensure the stability of the product quality, and improves the yield and the qualified rate.)

1. The utility model provides a frock for optical fiber perform wire drawing, optical fiber perform is including consecutive optical fiber perform body, the loose body of tail end and caudal peduncle, a serial communication port, the frock includes

One end of the switching tail handle is connected with the tail handle, and the other end of the switching tail handle is connected with a rod feeding mechanism of the optical fiber drawing equipment;

the sleeve cushion block is arranged at the joint of the tail handle and the tail end loose body;

the sleeve adjusting sheet is arranged on the sleeve cushion block; and

the gas seal sleeve is arranged on the sleeve adjusting sheet and adjusts the relative position of the sleeve adjusting sheet and the optical fiber preform;

wherein the inner diameter of the gas seal sleeve is smaller than the diameter of the optical fiber preform body, and the outer diameter of the gas seal sleeve is larger than the diameter of the optical fiber preform body.

2. The tooling of claim 1, wherein the difference between the outer diameter of the gas seal sleeve and the diameter of the optical fiber preform body is not more than 5 mm.

3. The tooling of claim 1, wherein one end of the sleeve cushion block is provided with a chute corresponding to the taper of the tail loose body, and the inner diameter of the sleeve cushion block is larger than the outer diameter of the tail handle.

4. The tooling of claim 1, wherein the outer diameter of the upper portion of the gas seal sleeve is larger than the outer diameter of the tail shank by a difference in the range of 1-2 mm.

5. The tooling of claim 1, wherein a gap of 1mm is provided between the inner wall of the gas seal sleeve and the optical fiber preform body.

6. The tooling of claim 1, wherein the gas seal sleeve has a protrusion thereon for contacting a gas seal of a draw furnace to prevent the gas seal sleeve from continuing deep into the draw furnace.

7. The tooling of claim 6, wherein the gas seal sleeve further comprises a blowing port for high purity nitrogen gas, and the blowing port is closer to the adapter shank than the protrusion.

8. The tooling of claim 7, wherein the blowing ports are of four-hole symmetrical design.

9. The tooling of claim 1, wherein the transition tail shank is a quartz transition tail shank.

10. The use method of the tool for drawing the optical fiber perform rod comprises an optical fiber perform rod body, a tail end loosening body and a tail handle which are sequentially connected, and is characterized in that the use method comprises the following steps:

step S1: installing a sleeve cushion block to a joint of the tail handle and the tail loose body, wherein one end of the sleeve cushion block is provided with a chute corresponding to the taper of the tail loose body, and the inner diameter of the sleeve cushion block is larger than the outer diameter of the tail handle;

step S2: installing a sleeve adjusting sheet and a gas seal sleeve, wherein the difference between the outer diameter of the gas seal sleeve and the diameter of the optical fiber preform body is not more than 5mm, and the relative position of the gas seal sleeve and the optical fiber preform is adjusted through the sleeve adjusting sheet;

step S3: the tail handle is connected with a quartz switching tail handle, and the other end of the switching tail handle is connected with a rod feeding mechanism of optical fiber drawing equipment;

step S4: and drawing the fiber, wherein when the fiber is drawn to the tail end of the optical fiber perform, the gas seal sleeve contacts with a gas seal structure of the fiber drawing furnace until the bulge of the gas seal sleeve contacts with the gas seal structure, the gas seal sleeve stops moving, and the optical fiber perform continues to enter the fiber drawing furnace.

Technical Field

The invention relates to a tool for drawing an optical fiber preform rod and a using method thereof, in particular to a high-efficiency and low-cost tool for drawing an optical fiber preform rod and a using method thereof.

Background

As shown in FIG. 1, after the optical fiber preform 1 is subjected to cladding deposition by OVD method and sintering degassing is completed, an unsintered tapered end loose body 12 exists between the optical fiber preform body 11 of the optical fiber preform 1 and the tail handle 13 for deposition installation.

The loose body is a reducing area, but in order to guarantee the quality of the finished optical fiber perform, the welding position of the optical fiber perform body and the tail handle is usually slightly deviated to the optical fiber perform body. In addition, a certain fuzzy interface exists between the rod body of the actual glass-state optical fiber preform and the position of the diameter change of the loose body, so that the overall utilization rate of the optical fiber preform can be reduced if the loose body and the tail handle are cut off. Further, it is also necessary to weld the optical fiber preform from which the tail handle is cut off to a separately purchased quartz tail handle and then draw the same. In order to ensure that the optical fiber perform is completely drawn, the welded quartz tail handle has loss after each drawing is completed, and the quartz tail handle can be abandoned until the length is not enough and the quartz tail handle can not be used.

In addition, when the optical fiber is drawn, the inner airflow field of the drawing furnace is easy to be disturbed due to poor sealing if reasonable air seal design is not carried out in the section area due to the tapered reducing relation. The diameter of the optical fiber is suddenly changed to discard the product, and oxygen enters the optical fiber drawing furnace to discard the graphite in the furnace body due to oxidation. Therefore, the conventional operation needs to cut the original tail handle area containing the loose body area and weld the cylindrical quartz tail handle again for wire drawing and hanging.

Namely: 1. the cost of fiber drawing production is increased by purchasing cutting and welding equipment, oxyhydrogen flame for welding, and a quartz tail shank for separate welding. And the quartz tail handle which is additionally purchased is short in length after being used for a plurality of times and cannot be used continuously, so that the cost is increased and the resource is wasted.

2. Because a part of available core layer and cladding layer are cut off in the process of cutting the original tail handle, the actual utilization rate and the theoretical utilization rate of the optical fiber preform have errors, and the phase change causes the increase of production cost and the reduction of yield.

It is therefore necessary to provide an efficient and cost-effective way of drawing an optical fiber preform.

Disclosure of Invention

The invention aims to solve the problems of high drawing cost and low stability of an optical fiber preform.

In order to achieve one of the above objects, an embodiment of the present invention provides a tool for drawing an optical fiber preform.

The tool comprises

One end of the switching tail handle is connected with the tail handle, and the other end of the switching tail handle is connected with a rod feeding mechanism of the optical fiber drawing equipment;

the sleeve cushion block is arranged at the joint of the tail handle and the tail end loose body;

the sleeve adjusting sheet is arranged on the sleeve cushion block; and

the gas seal sleeve is arranged on the sleeve adjusting sheet and adjusts the relative position of the sleeve adjusting sheet and the optical fiber preform;

wherein the inner diameter of the gas seal sleeve is smaller than the diameter of the optical fiber preform body, and the outer diameter of the gas seal sleeve is larger than the diameter of the optical fiber preform body.

As an optional technical scheme, the difference between the outer diameter of the gas seal sleeve and the diameter of the optical fiber preform body is not more than 5 mm.

As an optional technical scheme, one end of the sleeve cushion block is provided with a chute corresponding to the taper of the tail loose body, and the inner diameter of the sleeve cushion block is larger than the outer diameter of the tail handle.

As an optional technical scheme, the outer diameter of the upper part of the air seal sleeve is larger than that of the tail handle, and the difference range of the outer diameter is 1-2 mm.

As an alternative, a gap of 1mm is provided between the inner wall of the gas seal sleeve and the optical fiber preform body.

As an optional technical scheme, the air seal sleeve is provided with a protrusion, and the protrusion is used for contacting with an air seal piece of the wire drawing furnace to prevent the air seal sleeve from further extending into the wire drawing furnace.

As an optional technical scheme, the gas seal sleeve is further provided with a blowing opening for high-purity nitrogen, and the blowing opening is closer to the adapter tail handle than the protrusion.

As an optional technical scheme, the blowing opening is designed in a four-hole symmetrical mode.

As an optional technical solution, the adapter tail handle is a quartz adapter tail handle.

The invention also provides a use method of the tool for drawing the optical fiber perform rod, the optical fiber perform rod comprises an optical fiber perform rod body, a tail end loosening body and a tail handle which are sequentially connected, and the use method comprises the following steps:

step S1: installing a sleeve cushion block to a joint of the tail handle and the tail loose body, wherein one end of the sleeve cushion block is provided with a chute corresponding to the taper of the tail loose body, and the inner diameter of the sleeve cushion block is larger than the outer diameter of the tail handle;

step S2: installing a sleeve adjusting sheet and a gas seal sleeve, wherein the difference between the outer diameter of the gas seal sleeve and the diameter of the optical fiber preform body is not more than 5mm, and the relative position of the gas seal sleeve and the optical fiber preform is adjusted through the sleeve adjusting sheet;

step S3: the tail handle is connected with a quartz switching tail handle, and the other end of the switching tail handle is connected with a rod feeding mechanism of optical fiber drawing equipment;

step S4: and drawing the fiber, wherein when the fiber is drawn to the tail end of the optical fiber perform, the gas seal sleeve contacts with a gas seal structure of the fiber drawing furnace until the bulge of the gas seal sleeve contacts with the gas seal structure, the gas seal sleeve stops moving, and the optical fiber perform continues to enter the fiber drawing furnace.

Compared with the prior art, the wire drawing tool can directly use the original tail handle to draw wires in the wire drawing process, all accessories in the process can be reused, and no loss or additional cost is generated in the normal wire drawing process; the problems of collision and jamming among the sleeve, the loose body and the prefabricated rod are avoided through the design of the air seal structure; the problem that the gas seal is difficult to seal due to the reducing of the loose body is solved at the last stage of fiber drawing of the optical fiber preform, a safe and reliable solution is provided, the stability of the product quality can be guaranteed, and the yield and the qualified rate are improved.

Drawings

FIG. 1 is a schematic view of an optical fiber preform;

FIG. 2 is a schematic view of the tool for drawing an optical fiber preform according to the present invention drawing a fiber on an optical fiber preform body;

FIG. 3 is a schematic view of the drawing tool for drawing an optical fiber preform according to the present invention at the tail end of the optical fiber preform.

Detailed Description

In order to make the objects, technical solutions and advantages of the present application more clear, the technical solutions of the present application will be clearly and completely described below with reference to the detailed description of the present application and the accompanying drawings. It should be apparent that the described embodiments are only some embodiments of the present application, and not all embodiments. All other embodiments obtained by a person of ordinary skill in the art without any inventive work based on the embodiments in the present application are within the scope of protection of the present application.

Reference will now be made in detail to embodiments of the present invention, 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 accompanying drawings are illustrative only for the purpose of explaining the present invention, and are not to be construed as limiting the present invention.

For convenience in explanation, the description herein uses terms indicating relative spatial positions, such as "upper," "lower," "rear," "front," and the like, to describe one element or feature's relationship to another element or feature as illustrated in the figures. The term spatially relative position may encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, elements described as "below" or "above" other elements or features would then be oriented "below" or "above" the other elements or features. Thus, the exemplary term "below" can encompass both a spatial orientation of below and above.

Fig. 2 is a schematic drawing diagram of the tool for drawing the optical fiber preform rod of the present invention on the optical fiber preform rod body, and fig. 3 is a schematic drawing diagram of the tool for drawing the optical fiber preform rod of the present invention on the tail end of the optical fiber preform rod, please refer to fig. 2 and fig. 3 together.

The invention provides a tool for drawing an optical fiber perform rod 1, wherein the optical fiber perform rod 1 comprises an optical fiber perform rod body 11, a tail end loosening body 12 and a tail handle 13 which are sequentially connected, and the tool comprises a switching tail handle 2, a sleeve cushion block 3, a sleeve adjusting sheet 4 and an air sealing sleeve 5.

One end of the adapting tail handle 2 is connected with the tail handle 13, and the other end of the adapting tail handle 2 is connected with a rod feeding mechanism (not shown) of the optical fiber drawing equipment.

The sleeve cushion block 3 is arranged at the switching part of the tail handle 13 and the tail end loose body 12, the sleeve adjusting sheet 4 is arranged on the sleeve cushion block 3, the air sealing sleeve 5 is arranged on the sleeve adjusting sheet 4 and is adjusted to be opposite to the optical fiber perform 1 through the sleeve adjusting sheet 4, wherein the inner diameter of the air sealing sleeve 5 is smaller than the diameter of the optical fiber perform body 11, and the outer diameter of the air sealing sleeve 5 is larger than the diameter of the optical fiber perform body 11.

Thus, when the tail end of the optical fiber preform 1 is drawn, as shown in fig. 3, the gas seal sleeve 5 can replace the tail end loose body 12 to contact with the gas seal structure 61 of the drawing furnace 6, so that the tightness of the tail gas seal can be ensured, and the gas seal sleeve 5 gradually enters the drawing furnace 6 along with the optical fiber preform 1. The outer wall of atmoseal sleeve 5 can be as the structure of the normal prefabricated stick of simulation progressively down, until optical fiber wire drawing stove top process gas's exit position, because atmoseal sleeve 5 has played the structure of the normal prefabricated stick of optical fiber 1 diameter of simulation in the stove like this for the air current of optical fiber wire drawing ending process is not big with normal optical fiber prefabricated stick 1 wire drawing time difference, so can play the air current stabilization function in afterbody wire drawing process, guarantee the stability of atmospheric pressure in the wire drawing stove simultaneously, can not make the air admission stove in. In addition, the wire drawing tool can be used for drawing wires by directly using the original tail handle, and all accessories can be recycled in the process.

In order to better achieve the sealing effect of the tool, the tool needs to be subjected to parameter setting.

In the present embodiment, the difference between the outer diameter of the gas seal sleeve 5 and the diameter of the optical fiber preform body 11 is not more than 5 mm; the outer diameter of the upper part of the air seal sleeve 5 is larger than that of the tail handle 13, and the difference range is 1-2 mm. For another example, the placement position of the gas seal sleeve 5 is adjusted by adjusting the thickness of the sleeve adjustment sheet 4, so that a gap of 1mm is formed between the inner wall of the gas seal sleeve 5 and the optical fiber preform body 11, thereby preventing the gas seal sleeve 5 and the optical fiber preform 1 from being stuck at high temperature. In addition, the air seal sleeve 5 is provided with a protrusion 51, and the protrusion 51 is used for contacting with an air seal part 61 of the drawing furnace 6 to prevent the air seal sleeve 5 from further extending into the drawing furnace 6. Furthermore, if a problem of a small amount of air flow leakage is caused by a large gap between the air seal sleeve 5 and the tail loose body 12, 13, a form of adding a blowing port of high purity nitrogen gas to the upper part of the air seal sleeve 5 can be improved, and the air inlet position is above the protrusion 51 on the outer edge of the air seal sleeve 5, that is, the blowing port is closer to the adapter tail 2 than the protrusion 51. The blowing inlet adopts a four-hole symmetrical air inlet mode, and the size of air flow needs to be adjusted according to the structure and the process requirements of the specific wire drawing furnace.

In this embodiment, one end of the sleeve cushion block 3 has a chute corresponding to the taper of the tail loose body 12, so that the sleeve cushion block 3 can be well matched with the tail loose body 12, and the inner diameter of the sleeve cushion block 3 is larger than the outer diameter of the tail handle 13, so that the transition part can be sleeved.

The method of using the tool is described in detail below.

Step S1: installing a sleeve cushion block to a joint of the tail handle and the tail loose body, wherein one end of the sleeve cushion block is provided with a chute corresponding to the taper of the tail loose body, and the inner diameter of the sleeve cushion block is larger than the outer diameter of the tail handle;

step S2: installing a sleeve adjusting sheet and a gas seal sleeve, wherein the difference between the outer diameter of the gas seal sleeve and the diameter of the optical fiber preform body is not more than 5mm, and the relative position of the gas seal sleeve and the optical fiber preform is adjusted through the sleeve adjusting sheet;

step S3: the tail handle is connected with a quartz switching tail handle, and the other end of the switching tail handle is connected with a rod feeding mechanism of optical fiber drawing equipment;

step S4: and drawing the fiber, wherein when the fiber is drawn to the tail end of the optical fiber perform, the gas seal sleeve contacts with a gas seal structure of the fiber drawing furnace until the bulge of the gas seal sleeve contacts with the gas seal structure, the gas seal sleeve stops moving, and the optical fiber perform continues to enter the fiber drawing furnace.

More specifically, when the optical fiber preform 1 is erected and installed, the sleeve spacer 3 is installed at the joint of the tail handle 13 and the tail end loose body 12, the inner diameter of the sleeve spacer 3 is slightly larger than the outer diameter of the tail handle 13, and a chute is formed at the lower end of the sleeve spacer to match the taper of the tail end loose body 12. Install sleeve trimmer 4 and atmoseal sleeve 5 afterwards, the internal diameter of atmoseal sleeve 5 can be slightly littleer than 1 normal section (being optical fiber perform body 11) diameter of optical fiber perform, the external diameter is slightly bigger (no longer than 5mm) than actual perform diameter, the internal hole diameter on atmoseal sleeve 5 upper portion is 1-2mm bigger than the caudal peduncle 13 external diameter, through the position of placing of the thickness adjustment atmoseal sleeve 5 of adjustment sleeve trimmer 4 for there is 1mm clearance (for avoiding high temperature to make atmoseal sleeve 5 block with optical fiber perform 1) between 5 inner walls of atmoseal sleeve and optical fiber perform 1. And connecting the mounted tail handle 13 with the quartz adapter tail handle 2, and connecting the other end of the adapter tail handle 2 with a rod feeding mechanism of the optical fiber drawing equipment.

During normal wire drawing, the tooling is in the pattern of fig. 3. When the optical fiber perform 1 is drawn to the tail end, the tail end loose body 12 of the optical fiber perform 1 gradually enters the drawing furnace 6. In the process, the air sealing sleeve 5 replaces the tail loose body 12 to be in contact with the air sealing structure 61 of the optical fiber drawing furnace 6, so that the sealing performance of the tail air seal is ensured. The gas-tight sleeve 5 is gradually introduced into the drawing furnace 6 along with the optical fiber preform 1. The outer wall of the gas seal sleeve 5 can gradually move downwards as a structure simulating a normal optical fiber preform 1 until the outlet position of the process gas at the top of the optical fiber drawing furnace 6, and slightly moves downwards, the protrusion 51 on the outer wall of the gas seal sleeve 5 can be in contact with the gas seal structure 61, the gas seal sleeve 5 does not continue to move downwards, and the optical fiber preform 1 can continue to enter the drawing furnace 6 (as shown in fig. 3). In this process, because atmoseal sleeve 5 has played the structure of the normal optical fiber perform 1 diameter of simulation in the stove for the air current of optical fiber wire drawing ending process is not big with normal perform wire drawing time difference, so can play the air current stabilization function in afterbody wire drawing process, guarantee the stability of 6 interior gas pressures of wire drawing stove simultaneously, can not make the air get into in the wire drawing stove 6.

The wire drawing tool is designed in a matching way by combining the tail structure of the optical fiber perform 1, and can achieve the following effects:

1) the original tail handle can be directly used for wire drawing, all accessories in the process can be recycled, and no loss or additional cost is generated in the normal wire drawing process;

2) the problems of collision and jamming among the sleeve, the loose body and the prefabricated rod are avoided through the design of the air seal structure;

3) the problem that the gas seal is difficult to seal due to the diameter change of the loose body is solved at the last stage of fiber drawing of the optical fiber preform, a safe and reliable solution is provided, the stability of the product quality can be ensured, and the yield and the qualification rate are improved.

In conclusion, the wire drawing tool can directly use the original tail handle to draw wires in the wire drawing process, all accessories in the process can be recycled, and no loss or additional cost is generated in the normal wire drawing process; the problems of collision and jamming among the sleeve, the loose body and the prefabricated rod are avoided through the design of the air seal structure; the problem that the gas seal is difficult to seal due to the reducing of the loose body is solved at the last stage of fiber drawing of the optical fiber preform, a safe and reliable solution is provided, the stability of the product quality can be guaranteed, and the yield and the qualified rate are improved.

It should be understood that although the present description refers to embodiments, not every embodiment contains only a single technical solution, and such description is for clarity only, and those skilled in the art should make the description as a whole, and the technical solutions in the embodiments can also be combined appropriately to form other embodiments understood by those skilled in the art.

The above-listed detailed description is only a specific description of a possible embodiment of the present invention, and they are not intended to limit the scope of the present invention, and equivalent embodiments or modifications made without departing from the technical spirit of the present invention should be included in the scope of the present invention.