Online annealing device and online annealing method for large-size optical fiber preform rod

Abstract

The invention discloses a mobile online annealing device and an online annealing method in process of manufacturing the large-size optical fiber preform rod, which are used for eliminating the stress generated due to flame burning of a blast lamp in the sedimentation process of an outsourcing layer of the optical fiber preform rod, and further improving the quality of the perform rod. The online annealing device comprises fixed bases I and II, cylinders I and II, metal blast lamps I and II, a gas flow controller, a metal gas pipe and a Teflon pipeline, wherein the fixed bases I and II are respectively matched with chuck substrates I and II, the metal blast lamp I is connected with the cylinder I, and the metal blast lamp II is connected with the cylinder II; the cylinders I and II are respectively arranged on the fixed bases I and II so as to position the metal blast lamp I and II; the metal blast lamp I and II are connected with the metal gas pipe by the Teflon pipeline; and the gas flow controller is arranged on the metal gas pipe.

Description

technical field [0001] An on-line annealing device and an on-line annealing method for a large-size optical fiber preform in the present invention relate to a mobile on-line annealing device and a method thereof in the manufacturing process of a large-size optical fiber preform, which are used to eliminate the outer cladding deposition of the optical fiber preform During the process, due to the stress generated by the burning of the blowtorch flame, the quality of the preform is improved and the production efficiency is increased. Background technique [0002] In order to reduce the cost of optical fiber production and improve deposition efficiency, large-size optical fiber preforms have become the main direction of preform technology development. [0003] There are four main methods of producing silica optical fiber prefabricated core rods: [0004] Microwave plasma activated chemical vapor deposition (PCVD- Plasma activated Chemical Vapor Deposition), modified chemical va...

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Problems solved by technology

[0007]1. The deposition torch moves left and right to deposit SiO2 powder on the mandrel. When the deposition torch moves to both ends of the powder rod, it will The burning of the rod causes the rod to generate stress and reduce its strength. As the diameter of the powder rod increases, the weight of the powder preform increases, and the shear force on the rod increases. Therefore, the probability of breaking the rod during the deposition process is higher. Will have a certain impact on the pass rate;

[0008]2. The deposition torch completes the SiO2 powder attachment on the mandrel surface by moving back and forth from left to right. In this movement mode, the left and right cones are parallel to The burning time of the part will be the same, which will easily lead to the uneven density of the left and right cone parts and the parallel part. The deviation of the density during the deposition process will cause cracks, and the crack diffusion will cause the whole powder rod to crack and be scrapped.

[0015]In the existing large-size optical fiber preform OVD manufacturing technology, due to device and process reasons, there are defects in the design of the cone, and the probability of rod breakage and cracking is high

In addition, the cone powder is relatively fluffy, and the cone is prone to cracks when the powder rod is sintered

Moreover, due to the poor compactness of the sintered cone, the probability of breaking during the transportation of the rod is also very high

[0016]Raw materials, gas, electricity, etc. are the main components of the cost of preform rods. If the rods are broken or cracked near the end of deposition, it will directly lead to the scrapping of raw materials, etc., giving business losses

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