Device and method for preparing optical fiber preform loose body through VAD

Abstract

The invention discloses a device and a method for preparing an optical fiber preform loose body through VAD, and relates to the field of manufacturing of optical fiber preforms. The device comprises:a deposition cavity, wherein a blowtorch set is arranged in the deposition cavity, and the jetting opening of the blowtorch set faces a high-temperature area at the bottom of the preform loose body; aheating ring arranged at the bottom in the deposition cavity; a lifting mechanism arranged at the bottom of the sidewall of the deposition cavity, wherein the lifting end of the lifting mechanism isconnected with the heating ring; and a lifting mechanism capable of driving the heating ring to move in the direction close to and away from the high-temperature area at the bottom of the preform looseg body. The heating ring maintains a constant cooling curve to perform slow gradient cooling on the high-temperature area of the preform loose body, so that the problem of stress cracking of the preform loose body due to rapid cooling can be effectively avoided, the risk that the device is smashed due to cracking and falling of the loose body is reduced, and the production stability and the production efficiency of the preform loose body are favorably improved.

Description

technical field [0001] The invention relates to the field of optical fiber prefabricated rod manufacturing, in particular to a device and method for VAD to prepare a loose body of an optical fiber preformed rod. Background technique [0002] With the rapid development of optical fiber communication, more and more attention has been paid to new special optical fibers and related devices. With the development of Internet of Things technology, users' demand for access bandwidth is also increasing. The traditional ADSL (Asymmetric Digital Subscriber Line, Asymmetric Digital Subscriber Line) broadband access method can no longer meet the needs of users, and fiber-to-the-home has become the final form for operators to solve the "last mile". It has very high requirements and has greatly driven the market demand for special optical fibers. [0003] In the existing production process, the VAD (Vaper Axial Deposition, Vapor Axial Deposition) process of the burner group is used to pr...

AI Technical Summary

Problems solved by technology

[0005] When the soot body of the preform rod is slightly cracked, during the transfer to the next sintering process, the cracked part of the soot body may continue to expand at high temperature, which will cause the soot body to fall and cause the furnace core tube to be cracked and scrapped, which greatly increases the Risk of Equipment Obsolescence

[0006] When the preform loose body is severely cracked and cannot be transferred to the next process, it means that the entire deposition process is scrapped and no benefits are generated, and the cleaning of the scrap loose body greatly increases the workload of production personnel and reduces the production efficiency of personnel

[0007] When the preform loose body cracks and falls directly after the blowtorch group stops, on the one hand, the deposition process is scrapped, and on the other hand, the falling loose body causes damage to the deposition equipment

[0008] Therefore, the soot body of special optical fiber preform is prone to cracking in the high-temperature zone during the production shutdown process. The cracked soot body not only greatly increases the production risk of the next process, but also brings additional production workload and reduces production. Efficiency, in severe cases, it will damage the production equipment and increase the production cost

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