A device and control method for preventing blow-by gas oxidation in an optical fiber drawing furnace

Abstract

The invention provides a device for preventing blow-by oxidation of an optical fiber wire drawing furnace. The device comprises an air pressure measuring device, a processing control device, a sealing device on the wire drawing furnace, and a columnar cavity formed in an extending tube of the wire drawing furnace. The air pressure measuring device is communicated with the columnar cavity through an air tube. A wire drawing tower control system arranged on the wire drawing furnace is connected with the air pressure measuring device and a processing control unit. The processing control unit is further connected with the air pressure measuring device. When the sealing state of the wire drawing furnace becomes poor and the air pressure value in the columnar cavity becomes low accordingly, the processing control unit can be triggered to give out an alarm, the problem that production workers cannot interfere a sealing device in time when the optical fiber wire drawing furnace just begins to blowing gas or the production workers frequently interfere the sealing device to prevent optical fiber wire drawing furnace from blowing gas, and consequently efficiency is low is solved, the losses that due to blow-by oxidation, the strength and quality of optical fibers are reduced, and raw materials are consumed are reduced, and the production qualified rate of the optical fibers is increased.

Description

technical field [0001] The invention belongs to the technical field of optical fiber production, and in particular relates to a device and a control method for preventing blow-by gas oxidation in an optical fiber drawing furnace. Background technique [0002] During the fiber drawing process, the graphite parts in the drawing furnace are heated to melt the preform. According to the characteristics of graphite parts that are easy to react with oxygen at high temperatures, we need to use a set of sealing devices to seal the furnace body. On the one hand, the graphite parts are isolated. Air, on the other hand, can ensure the stability of the process gas in the furnace. With the increasing pressure of cost, in order to control the cost, the diameter of the preform is getting bigger and bigger, and the diameter change span of a single rod is also getting bigger, which puts pressure on the sealing device of the drawing furnace, because During the drawing process, the diameter of...

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Problems solved by technology

As the cost pressure is increasing, in order to control the cost, the diameter of the preform is getting bigger and bigger, and the diameter change span of a single rod is also getting bigger, which puts pressure on the sealing device of the drawing furnace, because During the drawing process, the diameter of the preform becomes smaller and smaller, and the gap between the rod and the quartz wool in the sealing device will gradually become larger and larger, which will cause the air to enter the furnace and oxidize the graphite parts. The process gas will also be disturbed, seriously affecting the strength and quality of the optical fiber

At present, in order to prevent the phenomenon of blow-by gas oxidation in the drawing furnace, it is usually necessary for the drawing staff to frequently go to intervene in the sealing device of the drawing furnace, and press the quartz wool to ensure the sealing effect, or the drawing staff do not operate in time, and the drawing furnace has a serious blow-by phenomenon Measures will be taken only when the diameter fluctuation of the optical fiber has been affected, which greatly reduces the production quality level and efficiency of the optical fiber

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