Drawing furnace

Abstract

The invention provides a wire drawing furnace, which includes a furnace body and a heating assembly. The furnace body is a hollow structure. The furnace body includes a cavity for accommodating the heating assembly. Both ends of the furnace body are respectively equipped with Inlet and outlet, the heating assembly includes several heating elements and a central pipe, the several heating elements are arranged around the periphery of the central pipe, and the temperature of the heating elements is directed toward the The direction of the discharge port increases sequentially. In the wire drawing furnace provided by the present invention, by arranging the plurality of heating elements around the peripheral side of the central tube, the temperature of the heating elements increases sequentially along the direction from the inlet to the outlet, preferably It maintains the temperature field in the furnace, improves the heating effect, improves the quality of the optical fiber filament, and reduces the Si-O bond breakage of the preform base material.

Description

technical field [0001] The invention relates to a wire drawing furnace, in particular to a wire drawing furnace for optical fiber drawing. Background technique [0002] This section is intended to provide a background or context for implementations of the invention that are set forth in the claims and detailed description. The descriptions herein are not admitted to be prior art by inclusion in this section. [0003] During the fiber drawing process, the tail end of the glass base material is heated by the heating body and the glass base material is moved downward. When the temperature is high enough (2000°C), the glass base material is melted and drawn into filaments. [0004] In the existing wire drawing process, in order to reduce the head-to-tail loss of multiple glass base materials and reduce unnecessary production man-hours such as process transportation and installation, it is necessary to increase the diameter of the glass base material. At the same time, the diam...

AI Technical Summary

Problems solved by technology

Due to the small diameter of the molten part of the glass base material, when the diameter of the graphite central tube increases, the molten part of the glass base material is far away from the heating body outside the graphite central tube, which affects the heating effect and makes the quality of the optical fiber filament produced decline

Moreover, with the advancement of wire drawing technology, in order to improve the efficiency of wire drawing, the speed of wire drawing has also increased. At this time, it is necessary to reduce the time from the softening of the glass base material to the formation of optical fiber filaments, which requires increasing the heating temperature, but increasing the heating temperature It will make the temperature field in the furnace uneven, and the Si-O bond of the glass base material will break, which will further cause the quality of the optical fiber to decline.

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