Glass rod sintering furnace used for making optical fiber preform

Abstract

The invention relates to a glass rod sintering furnace used for making optical fiber preform. The furnace comprises a box-shaped furnace body, the furnace body comprises two side surfaces, a front surface, a back furnace, a bottom surface and a top surface, the two side surfaces are correspondingly provided with rod traversing windows, the front surface of the furnace body is provided with a combustible gas blast burner window, and the top surface is obtained through splicing and inserting quartz glass strip-shaped bricks laterally respectively provided with tenons and grooves. The furnace can prevent falling of fractured top bricks and avoid damages of processed pieces and interruption of processing, so the working reliability of the sintering furnace is enhanced, and the service life of the sintering furnace is prolonged; mutual embedded connection of the strip-shaped top bricks through the tenons and the grooves forms the seamless quartz glass top surface and improves the heat insulation performance of the sintering furnace; the top surface strip-shaped bricks adopt the grooves or the tenons with a symmetric equal section structure, so the fracture risk of the quartz glass strip-shaped top bricks is reduced, thereby further prolonging the service life of the glass rod sintering furnace; and the furnace has a reasonable structure, and is convenient to make and maintain.

Description

technical field [0001] The invention relates to a glass rod firing furnace for making optical fiber preformed rods, and belongs to the technical field of optical fiber preformed rod manufacturing equipment. Background technique [0002] During the processing of optical fiber preforms, it is often necessary to melt the end faces of two glass rods (tubes) into a butt joint, or melt the ends of the preforms to form a cone or other shapes. Rod firing furnace, through the high-temperature injection combustion of the gas torch in the furnace, the processed end of the glass rod is in a molten state to complete the above work. The glass rod firing furnace has dual functions of combustion and heat preservation. Most of the existing glass rod firing furnaces are constructed of block-shaped quartz materials. A gas blowtorch is installed in the front, and the top surface of the box-shaped firing furnace is composed of strips of quartz glass. top surface. The melting point of the glas...

AI Technical Summary

Problems solved by technology

The melting point of the glass workpiece is about 2000°C. When the furnace is working, the temperature in the furnace is relatively high, and part of the heat generated by the flame naturally rises, making the temperature of the top of the furnace reach a higher temperature. In this case, one or more pieces are often caused. The quartz glass top brick breaks without warning during a working step. Since the two ends of the top brick are supported and installed overhead, the broken top brick will fall due to its own weight and damage the glass rod and glass tube workpiece, which will end the processing and even cause the workpiece to be scrapped.

At the same time, in order to repair the damaged firing furnace, it takes downtime for the cold furnace and maintenance downtime, which seriously affects the production schedule

Images