Quartz tube heating device and optical fiber preform preparation system

Abstract

The invention discloses a quartz pipe heating device and an optical fiber preform preparation system.The quartz pipe heating device comprises a furnace body, an induction coil mechanism, a graphite heating body and a graphite heat preservation cylinder, and the induction coil mechanism, the graphite heat preservation cylinder and the graphite heating body are all located in the furnace body; the induction coil mechanism is provided with an induction coil located outside the graphite heating body, the induction coil is electrified to generate an alternating magnetic field to enable the graphite heating body to heat, a hollow channel is formed in the graphite heating body to contain a quartz pipe, and the graphite heat preservation cylinder is located below the graphite heating body and internally provided with a hollow channel to be communicated with the hollow channel of the graphite heating body. The quartz tube heating device has the advantages of being stable and reliable in performance, simple in structure and easy to implement.

Description

technical field [0001] The invention relates to the technical field of optical fiber preform rod manufacturing, in particular to a quartz tube heating device and an optical fiber preform rod preparation system. Background technique [0002] At present, there are two common process routes for the production of optical fiber preforms: one is to manufacture the master rod by VAD (vapor axial deposition) technology, and obtain the core rod after high-temperature sintering and stretching, and then use OVD ( outside vapor deposition (outside vapor deposition) deposits a cladding on the periphery of the core rod, and obtains an optical fiber preform through subsequent dehydration and sintering processes; the second is to directly obtain an optical fiber preform by means of a core rod casing. In order to improve production efficiency, generally a larger-sized master bar is prepared first, and then heated, melted, softened, and then stretched to obtain a target-sized mandrel or sleev...

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Problems solved by technology

There are two shortcomings in this patent: one is that the plasma heat source is located in an open environment, which has a large heat radiation to the surroundings, the thermal efficiency is not high, and the strong plasma arc is not friendly to the operator; the other is that although the upper and lower chucks mentioned in the patent It can rotate synchronously, but for a single plasma heat source, there is a situation that the circumference of the pipe is heated unevenly, resulting in the quality of the stretched pipe not meeting the standard

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