CN106810065B

CN106810065B - Automatic fiber drawing device and automatic fiber drawing method for optical fiber preform

Info

Publication number: CN106810065B
Application number: CN201710072103.2A
Authority: CN
Inventors: 沈小平; 田佳; 蒋锡华; 蒋小强; 朱坤; 唐成; 魏文涛
Original assignee: Tongding Interconnection Information Co Ltd
Current assignee: Tongding Interconnection Information Co Ltd
Priority date: 2017-02-07
Filing date: 2017-02-07
Publication date: 2020-01-10
Anticipated expiration: 2037-02-07
Also published as: WO2018145519A1; CN106810065A

Abstract

An automatic optical fiber preform drawing device comprises a tail pipe, an optical fiber preform, a butt joint step, a quartz sleeve, a drawing furnace, a furnace mouth gas seal and a furnace mouth metal gas plate; the diameter of the tail pipe is smaller than that of the optical fiber preform rod, the optical fiber preform rod and the tail pipe are welded together at high temperature to form a butt joint step, the butt joint step is perpendicular to the optical fiber preform rod, N quartz sleeves which are stacked up and down are sleeved on the outer side of the tail pipe and clamped on the butt joint step, N is larger than or equal to 3, the optical fiber preform rod is vertically hung into the wire drawing furnace through a furnace mouth metal gas plate, and a furnace mouth gas seal is arranged on the furnace mouth metal gas plate. The invention also discloses an automatic wire drawing method of the automatic wire drawing device for the optical fiber preform. The invention has the advantages of ensuring the stability of the airflow and the temperature field in the furnace, ensuring the stability of the fluctuation of the wire diameter, prolonging the service life of the graphite piece, reducing the production cost of the optical fiber, greatly improving the wire drawing efficiency and having larger popularization and application values.

Description

Automatic fiber drawing device and automatic fiber drawing method for optical fiber preform

Technical Field

The invention relates to an automatic wire drawing device and an automatic wire drawing method, in particular to an automatic wire drawing device and an automatic wire drawing method for an optical fiber preform.

Background

The optical fiber drawing is a process operation process of heating and melting a prefabricated rod by using certain heating equipment, drawing the prefabricated rod into a fine optical fiber with the diameter meeting the requirement, and ensuring that the core/package diameter ratio and the refractive index distribution form of the optical fiber are unchanged. Therefore, the optical fiber perform and the drawing process directly determine the production cost, quality and profit of optical fiber and cable enterprises, improve the utilization efficiency of raw materials of the optical fiber perform and become the main attack direction for reducing the cost of the optical fiber perform and the optical fiber.

At present, domestic optical fiber drawing is basically semi-automatic drawing, in order to save cost, a small tail pipe is adopted to butt joint an optical fiber preform for drawing, when the preform is drawn to a tail rod, the diameter of the small tail pipe is greatly different from that of the preform, the rod feeding amount and the power of a drawing furnace need to be manually and continuously interfered, the stability of the fiber diameter fluctuation and the stability of various optical parameter performances are difficult to control, and the production of qualified optical fibers is influenced. For example, CN104211295A in the prior art discloses an optical fiber drawing device and a drawing method thereof, in the drawing device, the tail end of an optical fiber preform passes through a quartz glass tail tube and a rod hanging platform, and the rod feeding amount and the drawing furnace power need to be manually and continuously interfered, so that the purpose of automatic drawing cannot be realized; meanwhile, the diameter of the quartz glass tail pipe of the wire drawing device is smaller than that of the optical fiber preform, so that the uniformity of a temperature field is inevitably influenced by the change of the size of a gap between the quartz glass tail pipe and the graphite heating element of the wire drawing furnace after the quartz glass tail pipe enters the wire drawing furnace. Therefore, the development of an automatic optical fiber preform drawing device which can improve the utilization rate of an optical fiber preform, reduce the production cost of an optical fiber and ensure the stability of air flow and a temperature field in a drawing furnace is urgently needed.

Disclosure of Invention

The invention aims to realize the following technical scheme that the automatic optical fiber preform drawing device comprises a tail pipe, an optical fiber preform, a butt joint step, a quartz sleeve, a drawing furnace, a furnace mouth gas seal and a furnace mouth metal gas plate; the diameter of the tail pipe is smaller than that of the optical fiber preform rod, the optical fiber preform rod and the tail pipe are welded together at high temperature to form a butt joint step, the butt joint step is perpendicular to the optical fiber preform rod, N quartz sleeves which are stacked up and down are sleeved on the outer side of the tail pipe and clamped on the butt joint step, N is larger than or equal to 3, the optical fiber preform rod is vertically hung into the wire drawing furnace through a furnace mouth metal gas plate, and a furnace mouth gas seal is arranged on the furnace mouth metal gas plate.

Further, a seamless connection mechanism is arranged between the adjacent quartz sleeves.

Further, seamless coupling mechanism is the annular of setting on quartz sleeve border, and this annular is easy to assemble, can guarantee the leakproofness between two liang of quartz sleeves and the accuracy of installation.

Further, the inner diameter of the quartz sleeve is 4mm larger than the diameter of the tail tube, the outer diameter of the quartz sleeve is the same as the diameter of the optical fiber prefabricated rod, and the height of the quartz sleeve is 300 mm.

Further, when the minimum length of the tail pipe is 950mm, the height of the quartz sleeve is set to be 300mm, and the number of the quartz sleeves to be placed is 3.

The further purpose of the invention is realized by the following technical scheme, and the automatic wire drawing method of the automatic wire drawing device for the optical fiber preform rod comprises the following steps:

1) firstly, fusing an optical fiber preform and a tail pipe together at high temperature to form a butt joint step;

2) then, downwards sleeving and clamping a first quartz sleeve on the butt joint step from the top of the tail pipe, and downwards sleeving and overlapping a second quartz sleeve on the first quartz sleeve from the top of the tail pipe until the Nth quartz sleeve is overlapped on the (N-1) th quartz sleeve;

3) after the N quartz sleeves are installed, vertically hanging the optical fiber preform into a wire drawing furnace through a furnace mouth metal gas plate, and sealing a furnace mouth gas seal on the furnace mouth metal gas plate;

4) and opening the furnace mouth gas seal on the furnace mouth metal gas plate, and normally heating, turning around and drawing wires.

According to the invention, the small tail pipes are butted with the uniform large-diameter optical fiber perform rod, so that the material cost is saved, a plurality of quartz sleeves with the same diameter as the optical fiber perform rod are arranged on the small tail pipes, and particularly, the upper opening ring grooves are arranged on the quartz sleeves, so that the sealing property and the mounting accuracy between every two quartz sleeves are ensured, the quartz sleeves are convenient to mount, the rod feeding quantity and the furnace power are always kept unchanged, the air flow and the temperature field in the wire drawing furnace are ensured to be stable after the small tail pipe device is fed into the furnace, the wire diameter fluctuation is stabilized, and the automatic wire drawing is realized; meanwhile, the air seal is arranged at the mouth of the wire drawing furnace, so that air is prevented from entering the furnace, the stability of air flow and temperature field in the wire drawing furnace is ensured, the oxidation of a graphite piece is prevented, and the strength of the optical fiber is improved.

In summary, the invention has the advantages of ensuring the stability of the airflow and the temperature field in the furnace, ensuring the stability of the fluctuation of the wire diameter, prolonging the service life of the graphite piece, reducing the production cost of the optical fiber, greatly improving the wire drawing efficiency and having larger popularization and application values.

Drawings

Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the invention. Also, like reference numerals are used to refer to like parts throughout the drawings. In the drawings:

fig. 1 is a schematic view of butt-joining of a preform rod and a tail tube according to the present invention. Wherein, 1-tail tube, 2-optical fiber prefabricated rod and 3-butt joint step.

FIG. 2 is a schematic view showing the quartz sleeve of the present invention after it has been installed. Among them, 4-quartz sleeve.

FIG. 3 is an enlarged view of the structure of the quartz sleeve joint.

FIG. 4 is a schematic view of the inventive tail rod entering the furnace. Wherein, 5-wire drawing furnace, 6-furnace mouth gas seal and 7-furnace mouth metal gas plate.

Detailed Description

Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.

According to an embodiment of the present invention, an automatic optical fiber preform drawing apparatus is provided, as shown in fig. 1-4, comprising a tail tube 1, an optical fiber preform 2, a butt-joint step 3, a quartz sleeve 4, a drawing furnace 5, a furnace mouth gas seal 6, and a furnace mouth metal gas plate 7; the diameter of the tail pipe 1 is smaller than that of the optical fiber perform 2, the optical fiber perform 2 and the tail pipe 1 are fused together at high temperature to form a butt joint step 3, the butt joint step 3 is perpendicular to the optical fiber perform 2, N quartz sleeves 4 which are stacked up and down are sleeved on the outer side of the tail pipe 1 and clamped on the butt joint step 3, N is larger than or equal to 3, the optical fiber perform 2 is vertically hung into a wire drawing furnace 5 through a furnace mouth metal gas plate 7, and a furnace mouth gas seal 6 is arranged on the furnace mouth metal gas plate 7.

According to the automatic optical fiber preform drawing device, an automatic drawing method of the automatic optical fiber preform drawing device is further provided, and the automatic optical fiber preform drawing method comprises the following steps:

1) firstly, fusing an optical fiber preform 2 and a tail pipe 1 together at high temperature to form a butt joint step 3, as shown in figure 1;

2) when the minimum length of the tail pipe is 950mm, the height of the quartz sleeves is set to be 300mm, the number of the quartz sleeves to be placed is 3, first, the first quartz sleeve 4 is downwards sleeved from the top of the tail pipe 1 and clamped on the butt-joint step 3, then, the second quartz sleeve 4 is downwards sleeved from the top of the tail pipe 1 and is overlapped into the annular groove on the edge of the first quartz sleeve 4, and then, the third quartz sleeve 4 is downwards sleeved from the top of the tail pipe 1 and is overlapped into the annular groove on the edge of the second quartz sleeve 4, as shown in fig. 2 and fig. 3;

3) after the 3 quartz sleeves are installed, vertically hanging the optical fiber preform 2 into a wire drawing furnace 5 through a furnace mouth metal gas plate 7, and sealing a furnace mouth gas seal 6 on the furnace mouth metal gas plate 7, as shown in fig. 4;

4) and opening a furnace mouth gas seal 6 on a furnace mouth metal gas plate 7, and normally heating and turning round for wire drawing.

The quartz sleeve adopted in the automatic fiber-drawing device for the optical fiber perform rod has very low cost, can be repeatedly utilized, solves the problem of manual continuous intervention of a tail rod, and ensures that the rod feeding amount and the furnace power are always kept unchanged; meanwhile, the arrangement of the air seal of the wire drawing furnace mouth prevents air from entering the furnace, prevents the oxidation of the graphite piece, and cooperatively ensures the stability of air flow and temperature field in the wire drawing furnace, thereby stabilizing the fluctuation of wire diameter and realizing the purpose of automatic wire drawing.

The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the appended claims.

Claims

1. An automatic wire drawing method by using an automatic wire drawing device for an optical fiber perform is characterized in that the automatic wire drawing device for the optical fiber perform comprises a tail pipe (1), an optical fiber perform (2), a butt joint step (3), a quartz sleeve (4), a wire drawing furnace (5), a furnace mouth gas seal (6) and a furnace mouth metal gas plate (7); the diameter of the tail pipe (1) is smaller than that of the optical fiber perform (2), the optical fiber perform (2) and the tail pipe (1) are fused together at high temperature to form a butt joint step (3), the butt joint step (3) is vertical to the optical fiber perform (2), N vertically stacked quartz sleeves (4) are sleeved on the outer side of the tail pipe (1) and clamped on the butt joint step (3), N is more than or equal to 3, the optical fiber perform (2) is vertically hung into the wire drawing furnace (5) through a furnace mouth metal gas plate (7), and a furnace mouth gas seal (6) is arranged on the furnace mouth metal gas plate (7); a seamless connecting mechanism is arranged between the adjacent quartz sleeves (4), and the seamless connecting mechanism is a ring groove arranged on the edge of the quartz sleeve (4); the inner diameter of the quartz sleeve (4) is 4mm larger than the diameter of the tail pipe (1), and the outer diameter of the quartz sleeve (4) is the same as the diameter of the optical fiber perform (2); the automatic wire drawing method comprises the following steps:

1) firstly, fusing an optical fiber preform rod (2) and a tail pipe (1) together at high temperature to form a butt joint step (3);

2) then, downwards sleeving and clamping a first quartz sleeve (4) on the butt joint step (3) from the top of the tail pipe (1), and downwards sleeving and overlapping a second quartz sleeve (4) on the first quartz sleeve (4) from the top of the tail pipe (1) until the Nth quartz sleeve (4) is overlapped on the Nth-1 th quartz sleeve (4);

3) after the N quartz sleeves (4) are installed, vertically hanging the optical fiber perform rod (2) into a wire drawing furnace (5) through a furnace mouth metal gas plate (7), and sealing a furnace mouth gas seal (6) on the furnace mouth metal gas plate (7);

4) and opening a furnace mouth gas seal (6) on a furnace mouth metal gas plate (7), and normally heating and turning round for wire drawing.

2. The automatic drawing method of an automatic optical fiber preform drawing apparatus according to claim 1, wherein when the minimum length of the tail tube (1) is 950mm, the height of the quartz sleeve (4) is set to 300mm and the number of the quartz sleeves (4) to be placed is set to 3.