Melting contraction method for improving uniformity of preform mandril

Abstract

The invention discloses a melting contraction method for improving the uniformity of a preform mandril. A melting contraction lathe, a high-temperature melting contraction furnace, an outer diameter measuring instrument, a shuttling moving motor and an encoder are included. The melting contraction method for improving the uniformity of the preform mandril comprises the following steps: S1, a preparation process: the high-temperature melting contraction furnace is heated to clamp a deposited hollow optical fiber perform on the melting contraction lathe; and S2, a melting contraction process: heating the continuously rotating hollow perform to 2000-2300 DEG C under the action of a high temperature, wherein the preform is softened at the high temperature. According to the melting contractionmethod for improving uniformity of the preform mandril, by arranging the outer diameter measuring instrument on the high-temperature melting contraction furnace and fixing the outer diameter measuringinstrument together with the high-temperature melting contraction furnace, the outer diameter measuring instrument moves with the high-temperature melting contraction furnace synchronously. The diameter of the optical fiber preform in the melting contraction process is measured in real time by means of the outer diameter measuring instrument. Moreover, position information in the moving process of the high-temperature melting contraction furnace is positioned accurately by means of the high-temperature melting contraction furnace and the encoder on the shuttling moving motor.

Description

technical field [0001] The invention relates to the technical field of optical fiber prefabricated rod manufacturing, in particular to a shrinkage method for improving the uniformity of a prefabricated rod core rod. Background technique [0002] At present, there are two main types of optical fiber prefabricated core rod manufacturing processes, which are external vapor deposition method and in-tube vapor deposition method. According to this process method, the preformed rod after the deposition is hollow tubular, and needs to undergo high-temperature melting and shrinkage to collapse the hollow rod into a solid one before the entire prefabricated rod mandrel process is completed. [0003] In the optical fiber preform shrinkage process, it is generally necessary to go through multiple rounds to gradually reduce the aperture in the center of the preform while ensuring the roundness of the preform until it meets the requirements for burning. At the same time, during the optica...

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Problems solved by technology

[0004] Aiming at the deficiencies of the prior art, the present invention provides a shrinkage method that improves the uniformity of the preform mandrel, which solves the problems caused by fluctuations in the air flow, temperature and speed of the shrinkage furnace, and changes in the moving speed at the return point. The unevenness of the inner hole of the preform during the shrinkage process caused by the temperature fluctuation of the shrinkage furnace

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