KR100407339B1 - Furnace system using in fiber drawing process - Google Patents

Abstract

The present invention relates to a melting furnace system of an optical fiber drawing process, which is provided in a first floor to perform overall control of a melting furnace system and to digitally output a control signal for controlling various devices, and a gas controller in a two-layer gas controller. And a control module for converting a digital control signal output from the main controller into an analog signal and providing the same to a corresponding device.

Description

FURNACE SYSTEM USING IN FIBER DRAWING PROCESS

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical fiber drawing system for drawing an optical fiber from an optical fiber base material, and more particularly, to a furnace system in an optical fiber drawing system.

Typically, the optical fiber fabrication process consists of an optical fiber base material fabrication process and an optical fiber lead-out process for withdrawing one strand of optical fiber from the manufactured optical fiber base material. During the optical fiber fabrication process, the optical fiber drawing process is performed in one stand-out drawing tower (about 10 meters or more) through the drawing facilities and various controllers for operating or controlling the facilities.

1 is a schematic overall block diagram of a melting furnace system of a conventional optical fiber drawing process. Referring to FIG. 1, a main controller 120 as a controller for controlling the melting furnace system in the optical fiber extraction tower 110 having the extraction facilities for drawing the optical fiber, Other major devices include a gas controller (130), a rectifier (170) and a body (150). Additional devices include a pyrometer (160) and a remote box. 140 and the like are disclosed.

The stand-out drawer 110 is provided with a melting furnace, a diameter controller, a cooling device, a coating device, a curing device, a capstan, and the like. The optical fiber preform fixed by the chuck in the drawing tower 110 is melted at a high temperature by a melting furnace moving up and down by a conveying means and drawn out to the optical fiber. The drawn optical fiber has a diameter controlled by a diameter controller, cooled through a cooling device, coated by a coating device, coated by a curing device, and cured, and then passed through a capstan, and then a plurality of rollers. It is wound in a winder via the winder.

The drawing tower 110 has a height of typically 10 m or more, and thus, as shown in FIG. 1, the main controller 120 is provided on the first floor 1F, as compared to other equipments, that is, gas controllers. 130, the body 150, the rectifier 170, and the like can be seen provided in the second floor 2F. The main control unit 120 controls the gas controller 130, the remote box 140, the pyrometer 160, and the rectifier 170. At this time, the main control unit 120 on the first floor connects various devices on the second floor. The method uses wires, which requires approximately 110 wires.

However, there are some constraints on the control in such a system. First, the wiring length between the first and second floors is approximately 40m, and the operation of various devices (motor rotation or power source harmonic noise) or noise components from the rectifier 170 flows into the wiring and is actually transmitted to the first floor. Unwanted signals are included. Second, a very fine signal is used for the control, and when a signal picked up from the second floor equipment is transmitted to the main control unit 120 on the first floor, a minute voltage drop occurs and a difference from the actual data occurs. This can be a problem in control and produce undesirable results. As a result, a slight change in the flow rate (MFC) flow rate, a decrease in the accuracy of temperature control, a malfunction of the rectifier, and the like may occur, which may adversely affect the quality.

Therefore, an object of the present invention is to avoid the effect of noise on the wiring by the conventional connection wires when transmitting signals between the main control unit and the various devices of the second floor provided on the first floor, to prevent malfunction of the equipment and to transmit accurate signals It is to provide a melting furnace system of the optical fiber extraction process that can ensure the quality of the product by increasing the reliability of the equipment.

In order to achieve the above object, the present invention relates to a melting furnace system of a fiber drawing process including a gas controller, a rectifier, a remote box, and a pyrometer. And a control module installed in the gas controller and converting a digital control signal output from the main controller into an analog signal and providing the analog signal to a corresponding device.

1 is a schematic overall block diagram of a melting furnace system of a conventional optical fiber drawing process;

2 is a schematic overall block diagram of a melting furnace system of an optical fiber drawing process according to an embodiment of the present invention.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the following description, specific details such as specific components are shown, which are provided to help a more general understanding of the present invention, and it is understood that these specific details may be changed or changed within the scope of the present invention. It is self-evident to those of ordinary knowledge in Esau.

2 is a schematic overall block diagram of a melting furnace system of an optical fiber drawing process according to an embodiment of the present invention. Referring to FIG. 2, the main controller 220 as a controller for controlling the melting furnace system in the optical fiber extraction tower 110 having the drawing facilities for drawing the optical fiber, Other major devices include a gas controller 230, a rectifier 170, and a body 150, and as additional devices, a pyrometer 160 and a remote box. 140 and the like are disclosed.

At this time, unlike the prior art, the main control unit 220 of the present invention provided on the first floor provides a control signal directly to the gas controller 130, remote box 140, pyrometer 160 and rectifier 170. Instead of providing various devices, various devices are controlled through the gas controller 230 on the second floor.

That is, the gas controller 230 of the second floor is provided with a control module 280 (PLC: Programmable Logic Controller, or a module for sequence control), which is connected to the main control unit 220 of the first floor in a digital or serial link. It is connected to provide the control signal of the various devices of the main control unit 220 to the corresponding device.

That is, the gas controller 230 controls the rectifier 170 through the control module 230, sends the data output from the rectifier 170 to the main control unit 220 on the first floor, processes it, and then feeds back the feedback. ) To control the output of the rectifier 170. In addition, the gas controller 230 converts the remote box 140 and pyrometer 160 signals and analog data into digital signals through the control module 230 and then transmits them to the main controller 220 through serial or optical links. .

Since the control module 280 and the main controller 220 transmit and receive data in a digital manner, unlike the conventional method, the control module 280 and the main controller 220 are not affected by the noise on the wires during signal transmission, thereby enabling accurate signal transmission. At this time, the digital data transmitted between the control module 280 and the main control unit 220 is composed of an identifier indicating the corresponding device and a control signal portion for controlling the corresponding device so as to be controlled according to the corresponding device. In addition, when the control module 280 and the main control unit 220 is connected by an optical link, the main control unit 220 and the control module 280 is provided with a photoelectric converter.

By such a configuration, the melting furnace system of the optical fiber drawing process according to the present invention can be provided, and the operation of the melting furnace system will be described in more detail in the two-layer gas controller 230 having the control module 280. The control is performed by converting the digital data received from the main control unit 220 into an analog signal and providing all peripheral devices, and converting the analog signal provided from the peripheral device into digital and providing it to the main control unit 220.

Meanwhile, in the above description of the present invention, specific embodiments have been described, but various modifications may be made without departing from the scope of the present invention. For example, although the control module 280 of the present invention has been described as being provided inside the gas controller 230, in addition to the gas controller 230 in the other embodiment of the present invention and the gas controller 230 It may be separate and present separately or may be provided inside any one of the other peripheral devices.

Therefore, the scope of the present invention should not be defined by the described embodiments, but by the claims and equivalents of the claims.

As described above, in the present invention, since the operation control signal provided to the various devices on the second floor is provided as digital data from the main control unit on the first floor, unlike the conventional analog signal, the control data can be controlled without influx of noise or loss due to wiring. It can transmit / receive, prevent the malfunction of equipment and transmit the correct signal to improve the reliability of the equipment to ensure product quality.

Claims (3)

In the melting furnace system of the optical fiber extraction process including a gas controller, a rectifier, a remote box, a pyrometer, etc. A main control unit performing overall control of the melting furnace system and digitally outputting a control signal for controlling various devices such as a gas controller, a rectifier, a remote box, a pyrometer, and the like; A melting furnace system installed in the gas controller, the control module for receiving a digital control signal output from the main control unit and converts it into an analog signal and provides the gas controller, rectifier, remote box, pyrometer, etc. . delete The melting furnace system of claim 1, wherein the control module and the main control unit are connected in series and / or an optical link.