阅读说明：本技术 一种光纤拉丝用涂料的供给装置及方法 (Device and method for supplying coating for optical fiber drawing ) 是由 余倩卿 尹力 丁凡 李睿 黄青松 廉正刚 皮亚斌 于 2020-12-25 设计创作，主要内容包括：本发明公开了一种光纤拉丝用涂料的供给装置及方法,包含至少2个涂料存储罐、管道清洗溶液存储罐、废料存储罐、涂覆杯、文丘里真空发生器,储罐的上盖设有开孔,通过开孔将温度探测器、液位传感器、压力传感器伸入涂料存储罐内部；温度探测器直接与涂料接触,测试出涂料的温度并与外部的加热套实现闭环控制,液位传感器有高液位、中液位和低液位信号输出,在处于低液位时提供报警,压力传感器实时显示储罐内的压力,在压力过高或过低时报警。既可以满足快速消除涂料内部气泡,又能满足生产过程中不同种类的涂料的快速切换使用,操作容易、节省空间,避免换涂料换管道的复杂操作。(The invention discloses a device and a method for supplying coating for optical fiber drawing, which comprises at least 2 coating storage tanks, a pipeline cleaning solution storage tank, a waste storage tank, a coating cup and a Venturi vacuum generator, wherein the upper cover of the storage tank is provided with an opening, and a temperature detector, a liquid level sensor and a pressure sensor are inserted into the coating storage tank through the opening; the temperature detector directly contacts with the coating, tests the temperature of the coating and realizes closed-loop control with an external heating sleeve, the liquid level sensor has high liquid level, medium liquid level and low liquid level signal output and provides alarm when the liquid level is low, the pressure sensor displays the pressure in the storage tank in real time and alarms when the pressure is too high or too low. The device can quickly eliminate bubbles in the coating, can quickly switch different types of coatings in the production process, is easy to operate, saves space, and avoids complex operation of changing the coating and changing the pipeline.)

1. The device for supplying the coating for optical fiber drawing is characterized by comprising at least 2 coating storage tanks, a pipeline cleaning solution storage tank, a waste storage tank, a coating cup and a Venturi vacuum generator, wherein an upper cover of the storage tank is provided with an opening, and a temperature detector, a liquid level sensor and a pressure sensor extend into the coating storage tank through the opening; the temperature detector directly contacts with the coating, tests the temperature of the coating and realizes closed-loop control with an external heating sleeve, the liquid level sensor has high liquid level, medium liquid level and low liquid level signal output and provides alarm when the liquid level is low, the pressure sensor displays the pressure in the storage tank in real time and alarms when the pressure is too high or too low.

2. The apparatus for supplying a dope for drawing an optical fiber according to claim 1, wherein the dope storage tank is a metal material.

3. The apparatus for supplying a coating material for drawing an optical fiber according to claim 1 or 2, wherein the orifice is screw-tightly connected to the detector and the sensor.

4. A method for supplying a dope for drawing an optical fiber, comprising the steps of,

step one, removing an upper end cover of a coating barrel, putting the coating barrel into a coating storage tank, vacuumizing the waste storage tank by using a Venturi vacuum generator through controlling the state of a valve, and heating the coating storage tank to enable bubbles in the coating in the tank to escape;

secondly, supplying the coating in the coating storage tank into a coating cup through a pipeline under the action of pressure in the drawing process, and coating a liquid coating layer on the optical fiber passing through the coating cup;

step three, when the type of the used coating needs to be switched in the wire drawing process, closing a compressed air inlet valve and a coating discharge valve of a current coating tank, and sucking the residual coating in the pipeline by using a Venturi vacuum generator and a waste storage tank;

stopping absorbing the paint in the waste storage tank after the residual paint in the pipeline is absorbed into the waste storage tank, and injecting paint cleaning agent into the pipeline through the cleaning solution storage tank;

and step five, repeating the pumping and cleaning solution injection process in the step four to clean the pipeline.

5. The method of claim 4, wherein the thin liquid coating layer is cured by ultraviolet light irradiation in the second step.

Technical Field

The invention belongs to the technical field of optical fiber manufacturing equipment, and particularly relates to a device and a method for supplying coating for optical fiber drawing.

Background

The typical structure of an Optical Fiber (Optical Fiber) is a multilayer coaxial cylinder, which is composed of three parts, from inside to outside, a core, a cladding and a coating. The fiber core and the cladding are usually made of quartz materials with different refractive indexes, and due to special material and mechanism design, optical signals can be stably transmitted in the fiber core. The coating layer of the optical fiber generally consists of an inner coating layer and an outer coating layer which are jointly protected, so that the optical fiber has good microbending resistance and good environmental adaptability and mechanical damage resistance.

Optical fibers can be classified into communication fibers and specialty fibers according to their use. The inner coating layer and the outer coating layer of the communication optical fiber are generally fixed by materials, the single set of prefabricated rod has large volume, the producible optical fiber has long length, and the production process is stable. The special optical fiber needs to use different coatings due to special application conditions, so that the problem of frequent switching of different coatings can be faced in the drawing production process of the special optical fiber. The existing paint switching process is generally cumbersome to operate and results in wasted time and paint.

Disclosure of Invention

The invention aims to solve the technical problems that air bubbles in the coating can be eliminated quickly, different types of coatings can be switched and used quickly in the production process, and the device and the method for supplying the coating for optical fiber drawing are easy to operate, save space and avoid complex operation of changing the coating and changing pipelines.

The technical scheme adopted by the invention for solving the technical problems is as follows: firstly, providing a coating supply device for optical fiber drawing, comprising at least 2 coating storage tanks, a pipeline cleaning solution storage tank, a waste storage tank, a coating cup and a Venturi vacuum generator, wherein the upper cover of the storage tank is provided with an opening, and a temperature detector, a liquid level sensor and a pressure sensor are inserted into the coating storage tank through the opening; the temperature detector directly contacts with the coating, tests the temperature of the coating and realizes closed-loop control with an external heating sleeve, the liquid level sensor has high liquid level, medium liquid level and low liquid level signal output and provides alarm when the liquid level is low, the pressure sensor displays the pressure in the storage tank in real time and alarms when the pressure is too high or too low.

According to the technical scheme, the coating storage tank is made of metal materials.

According to the technical scheme, the small hole is tightly connected with the detector and the sensor through threads.

The present invention also provides a method for supplying a dope for drawing an optical fiber, comprising the steps of,

step one, removing an upper end cover of a coating barrel, putting the coating barrel into a coating storage tank, vacuumizing the waste storage tank by using a Venturi vacuum generator through controlling the state of a valve, and heating the coating storage tank to enable bubbles in the coating in the tank to escape;

secondly, supplying the coating in the coating storage tank into a coating cup through a pipeline under the action of pressure in the drawing process, and coating a liquid coating layer on the optical fiber passing through the coating cup;

step three, when the type of the used coating needs to be switched in the wire drawing process, closing a compressed air inlet valve and a coating discharge valve of a current coating tank, and sucking the residual coating in the pipeline by using a Venturi vacuum generator and a waste storage tank;

stopping absorbing the paint in the waste storage tank after the residual paint in the pipeline is absorbed into the waste storage tank, and injecting paint cleaning agent into the pipeline through the cleaning solution storage tank;

and step five, repeating the pumping and cleaning solution injection process in the step four to clean the pipeline.

According to the technical scheme, the liquid thin coating layer in the second step is solidified through ultraviolet irradiation.

The invention has the following beneficial effects: (1) the method and the device have wide application range, can be applied to the conventional communication optical fiber drawing production and manufacture, and can greatly meet the actual requirements of special optical fiber drawing towers. The method is suitable for the wet-to-wet process of wire drawing and the wet-to-dry process of wire drawing.

(2) The method and the device can meet various actual requirements only by properly modifying the connecting pipeline. For example, it can be expanded to a 3-tank system, a 4-tank system, or it can be integrated into 1 system for internal and external painting.

(3) The method and the device solve the problem that the existing method and equipment can not solve the problem of convenient and fast paint replacement.

(4) The method and the device can not only solve the problem of extracting residual and residual coating in the pipeline by optimizing the pipeline connection, but also provide a negative pressure environment during the heat preservation of the coating so as to facilitate the quick and complete escape of bubbles in the coating, improve the labor productivity and further reduce the product reject ratio.

(5) The method and the device creatively introduce the function of cleaning the pipeline by the solution in the feeding system, change the current situation that the pipeline needs to be changed when the coating needs to be changed, and reduce the related cost caused by changing the coating.

Drawings

The invention will be further described with reference to the accompanying drawings and examples, in which:

FIG. 1 is a schematic view of a multi-coating supply apparatus for drawing an optical fiber according to an embodiment of the present invention;

in the figure: 1 is a first paint storage tank, 2 is a second paint storage tank, 3 is a coating cup, 4 is a waste paint collection tank, 5 is a pipeline cleaning solution storage tank, 1-1 is a first electromagnetic valve, 2-1 is a second electromagnetic valve, 4-2 is a third electromagnetic valve, 4-5 is a fourth electromagnetic valve, 5-1 is a fifth electromagnetic valve, 6-2 is a sixth electromagnetic valve, 6-3 is a seventh electromagnetic valve, 6-6 is an eighth electromagnetic valve, 1-2 is a first pneumatic ball valve, 2-2 is a second pneumatic ball valve, 4-3 is a third pneumatic ball valve, 4-4 is a fourth pneumatic ball valve, 5-2 is a fifth pneumatic ball valve, 7-1 is a sixth pneumatic ball valve, 7-2 is a seventh pneumatic ball valve, 1-3 is a first temperature detector, 2-3 is a second temperature detector, 1-4 is a first liquid level sensor, 2-4 is a second liquid level sensor, 1-5 is a first pressure sensor, 2-5 is a second pressure sensor, 1-6 is a first heating sleeve, 2-6 is a second heating sleeve, 3-1 is a first heating belt, 3-2 is a second heating belt, 4-1 is a three-way joint, 6-1 is an electronic pressure regulating valve, 6-4 is a one-way valve, 6-5 is a venturi vacuum generator, and 8-1 is an air source triple piece.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

Referring to fig. 1, in the embodiment of the present invention, the "wet-on-wet" coating process in the drawing process of a special optical fiber is described in conjunction with the design mode, wherein the first coating storage tank 1 and the second coating storage tank 2 store the inner coating. This example includes the complete process of paint preparation, paint bubble removal, normal paint supply, paint switching, end of draw cleaning the tube.

Step one, removing the upper bottle caps of the original packages of the two different types of coatings, placing the two different types of coatings into the coating storage tanks shown in the step 1 and the step 2, and sealing the upper caps of the coating storage tanks.

And step two, removing coating bubbles, opening valves 6-3, 6-6, 1-1 and 2-1 in sequence, and keeping other valves in a closed state. And the heating jackets of 1-6 and 2-6 were set to work, and the dope was heated to 50 ℃. At this time, the temperature of the paint is increased, the viscosity is reduced, and air bubbles in the paint are quickly overflowed due to the negative pressure state in the tank. And the common way is that the former packing of coating is uncapped and is kept warm under atmospheric condition, and the negative pressure keeps warm in this patent and is higher than common way production efficiency, bubble removal more thorough.

And step three, the normal supply of the coating is described by taking the coating supplied in the storage tank 1 as an example.

After the coating bubbles are completely removed, valves 6-3, 6-6, 1-1 and 2-1 are closed, valves 6-2, 1-1, 1-2 and 7-2 are opened, and 6-1 is adjusted to ensure that the reading of the 1-5 pressure sensor is 1.0 bar. The coating in the reservoir 1 is now slowly fed into the coating cup 3 and is heated to the appropriate process temperature by the action of the heating belt of 3-1 before entering the coating cup 3. In the drawing process, the optical fiber vertically passes through the central hole of the coating cup at a high speed and is uniformly coated with a layer of coating. The liquid coating is cured under irradiation of ultraviolet light in an immediately subsequent ultraviolet curing process. The coating that the bare fiber took away and the coating that storage tank 1 supplied reach the balance, and the system satisfies stable production needs.

And step four, switching the coating, when one type of optical fiber is drawn and the optical fiber needs to be drawn by using the coating in the storage tank 2 instead of the coating in the original storage tank 1, closing the valves 6-2, 1-1, 1-2 and 7-2 in sequence, opening the valves 6-3, 6-6, 4-2, 4-3 and 7-2 in sequence, and pumping the residual coating in the feeding pipeline of the storage tank 1 and the coating in the coating cup into a waste coating collecting tank.

After pumping for 3 minutes, valves 6-3, 6-6, 4-2, 4-3 and 7-2 are closed in sequence to stop pumping.

And sequentially opening the valves 6-2, 5-1, 5-2, 4-3 and 4-5, wherein the solution in the pipeline cleaning solution storage tank enters the pipeline to be cleaned, and the cleaned polluted solution is pressed into the waste coating collecting tank 4.

Closing valves 6-2, 5-1, 5-2, 4-3 and 4-5 to finish solution cleaning, and opening valves 6-3, 6-6, 4-2, 4-3 and 7-2 to start extracting the residual solution in the pipeline.

The residual paint on the pipeline can be removed by repeating the pipeline extraction and pipeline cleaning processes for 3-5 times.

And opening valves 6-2, 5-1, 5-2, 4-4 and 4-5 to clean the storage tank 2 system to be used, and closing the valves 6-2, 5-1, 5-2, 4-4 and 4-5 after the flushing is finished. The valves 6-3, 6-6, 4-4 and 7-1 are opened to extract the residual solution in the pipeline. Then valves 6-3, 6-6, 4-4, 7-1 are closed.

And cleaning the whole device of the coating cup by the same conventional operation, drying, checking and reinstalling after cleaning.

Valves 6-2, 2-1, 2-2 and 7-1 are opened in sequence and the other valves are closed, at which time the storage tank 2 system begins to supply the new type of coating material to the coating cups as normal.

And step five, cleaning the pipeline after drawing is finished, and cleaning the coating in the storage tank 2 system after drawing is finished. Valves 6-2, 2-1, 2-2 and 4-4 are closed in sequence, valves 6-3, 6-6, 4-2, 4-4 and 7-1 are opened in sequence, and the residual paint in the feed pipeline of the storage tank 2 and the paint in the coating cup are pumped into a waste paint collecting tank 4.

After pumping for 3 minutes, valves 6-3, 6-6, 4-2 and 4-4 are closed in sequence to stop pumping.

And sequentially opening the valves 6-2, 5-1, 5-2, 4-4 and 4-5, wherein the solution in the pipeline cleaning solution storage tank enters the pipeline to be cleaned, and the cleaned polluted solution is pressed into the waste coating collecting tank 4.

Closing valves 6-2, 5-1, 5-2, 4-4 and 4-5 to finish solution cleaning, and opening valves 6-3, 6-6, 4-2, 4-4 and 7-1 to start extracting the residual solution in the pipeline.

The residual paint on the pipeline can be removed by repeating the pipeline extraction and pipeline cleaning processes for 3-5 times.

In the embodiment of the invention, the device used by the method comprises the following steps: the system comprises at least 2 coating storage tanks, a pipeline cleaning solution storage tank, a waste storage tank, a coating cup and a Venturi vacuum generator, wherein the upper cover of each coating storage tank is provided with an opening, and a temperature detector, a liquid level sensor and a pressure sensor extend into the coating storage tanks through the openings; the temperature detector directly contacts with the coating, tests the temperature of the coating and realizes closed-loop control with an external heating sleeve, the liquid level sensor has high liquid level, medium liquid level and low liquid level signal output and provides alarm when the liquid level is low, the pressure sensor displays the pressure in the storage tank in real time and alarms when the pressure is too high or too low. The storage tank is made of metal materials. The small hole is tightly connected with the detector and the sensor through threads. The coating storage tank consists of an upper cover, a tank body, a sealing ring and a metal hoop. After the coating is put in, the upper cover and the clamping hoop are closed, so that the storage tank can be ensured to be in a good sealing state.

It will be understood that modifications and variations can be made by persons skilled in the art in light of the above teachings and all such modifications and variations are intended to be included within the scope of the invention as defined in the appended claims.