Heating furnace for keeping centering of optical fiber preform rod and use method of heating furnace

Abstract

The invention relates to the technical field of optical fiber manufacturing equipment, and discloses a heating furnace for keeping centering of an optical fiber preform, the heating furnace comprises a furnace body, a heating piece and a rotating table, the rotating table is arranged above the furnace body, the upper end of the furnace body is connected with a detection piece through the rotating table, and the rotating table comprises a rotating ring and a base. According to the heating furnace for keeping centering of the optical fiber preform and the use method thereof, the eccentricity condition of the preform is measured through the detection piece, then the preform is directly adjusted in place through the movable clamp, starting and stopping in the centering process are reduced, centering errors are reduced, early warning is conducted when the preform is about to collide with the furnace wall, the preform is prevented from colliding with the furnace wall, meanwhile, the operation of secondary delivery is reduced, and the inner diameter of the heating piece is synchronously adjusted after the detection piece detects the outer diameters of different axial positions, so that the gap between the heating piece and the preform rod is always kept at the optimal distance, the heating uniformity is improved, and the wire drawing quality is improved.

Description

technical field [0001] The invention relates to the technical field of optical fiber manufacturing equipment, in particular to a heating furnace for maintaining the centering of optical fiber preform rods and a method for using the same. Background technique [0002] The optical fiber is drawn from the optical fiber preform in a heating furnace, and then the finished optical fiber is obtained after cooling, coating and ultraviolet curing processes. [0003] When the optical fiber preform is sent into the heating furnace, the coaxial condition of the preform and the heating furnace has an important influence on the drawing quality, so when the preform is sent into the heating furnace, it is necessary to use an adjustment feeding device to adjust the optical fiber preform and the drawing. The centering of the furnace needs to be frequently started and stopped when adjusting the feeding device. However, there is an impact offset during the starting and stopping process of the f...

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Problems solved by technology

[0003] When the optical fiber preform is sent into the heating furnace, the coaxial condition of the preform and the heating furnace has an important influence on the drawing quality, so when the preform is sent into the heating furnace, it is necessary to use an adjustment feeding device to adjust the optical fiber preform and the drawing. The centering of the furnace needs to be frequently started and stopped when adjusting the feeding device. However, there is an impact offset during the starting and stopping process of the feeding device, which leads to a large position error of the optical fiber preform. In the case of centering, it is necessary to withdraw the optical fiber preform from the drawing furnace for secondary delivery, and if it is not found in time, it is easy to make the optical fiber preform touch the furnace wall, causing damage to the surface of the preform and the inner wall of the furnace body

[0004] Furthermore, with the increase of the size of the optical fiber preform, especially the porous glass optical fiber preform manufactured by the external vapor deposition (OVD) process, the outer diameter of the preform along the axial direction fluctuates relatively large after the dehydroxylation heat treatment , there will be a greater challenge to neutrality, and at the same time, the distance between the furnace and the heating rod will also change greatly, which will also affect the uniformity of heating and the quality of the finished product

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