Method for drawing dual cones on preformed rod

Abstract

The invention provides a method for drawing dual cones on a preformed rod. The method is characterized by including the steps of firstly, preheating, to be specific, fixing the preformed rod by two clamps on an operating platform to ensure that the preformed rod is arranged at the horizontal plane, and turning on a blow torch to burn positions where the cones are drawn out until surface glass is in a melting state; secondly, carrying out N drawing stages, to be specific, a first drawing stage, namely, slowly moving the clamps when the surface glass of the preformed rod is in the melting state and then stopping until the distance between the left clamp and the right clamp is increased to a set distance, a second drawing stage, namely continuing heating the positions, with the maximum reducing, of the preformed rod by the blow torch, and then moving the clamps to repeat the operation of the first step, repeating the previous steps until completing drawing of the Nth stage; further, turning off the blow torch, placing the position, to be drawn, of the preformed rod, in a holding furnace, cooling slowly for a certain time, cutting off from the finest drawing position by a glass cutter, moving the two sections of preformed rod with the cones formed by drawing out of the holding furnace, and cooling the same for stand-by application.

Description

technical field [0001] The invention relates to the technical field of optical fiber preform rods, in particular to a method for drawing a preform rod into a bicone. Background technique [0002] The production process of optical fiber drawing is mainly to draw the optical fiber from the lower end after heating the optical fiber preform to a molten state through the drawing furnace. In order to effectively draw, reduce the loss of the preform rod at the beginning of wire drawing, and shorten the time for forming the preform cone, it is usually necessary to make the starting end of the preform rod into a streamlined cone before wire drawing. [0003] In the prior art, the processing method of drawing one end of the optical fiber preform into a tapered shape is to heat an optical fiber preform and a quartz rod, or use two optical fiber preforms, on a fusion lathe until the butt joint surfaces are fused together, Then, it is separated by dragging the molten bed, and one end of...

AI Technical Summary

Problems solved by technology

This method has defects: when the outer diameter of the preform is large, it is very difficult to pull out the streamlined cone head. At the same time, because another rod is needed as a drawing rod to draw the cone, a part of the preform will be pulled off, resulting in material waste of

The tapering method provided by this prior art can reduce the loss of the quartz rod during the tapering process of the optical fiber preform and reduce the tapering loss of the tapered head of the optical fiber preform; but it does not fundamentally solve the problem of the tapering loss of the optical fiber preform

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