OA17232A - Method and device for automatically controlling temperature of optical fiber coatings. - Google Patents
Method and device for automatically controlling temperature of optical fiber coatings. Download PDFInfo
- Publication number
- OA17232A OA17232A OA1201400545 OA17232A OA 17232 A OA17232 A OA 17232A OA 1201400545 OA1201400545 OA 1201400545 OA 17232 A OA17232 A OA 17232A
- Authority
- OA
- OAPI
- Prior art keywords
- température
- optical fiber
- coating
- circular heater
- liquid heat
- Prior art date
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- 239000003365 glass fiber Substances 0.000 title claims abstract description 69
- 230000001276 controlling effect Effects 0.000 title claims abstract description 24
- 238000000576 coating method Methods 0.000 claims abstract description 101
- 239000011248 coating agent Substances 0.000 claims abstract description 94
- 239000007788 liquid Substances 0.000 claims abstract description 48
- 238000005491 wire drawing Methods 0.000 claims abstract description 47
- 238000010438 heat treatment Methods 0.000 claims abstract description 42
- 238000000034 method Methods 0.000 claims abstract description 14
- 230000000875 corresponding Effects 0.000 claims description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 3
- 239000011344 liquid material Substances 0.000 claims description 2
- 230000003287 optical Effects 0.000 claims 8
- 239000011247 coating layer Substances 0.000 description 7
- 230000000694 effects Effects 0.000 description 3
- 229940056345 Tums Drugs 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000011521 glass Substances 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 150000001875 compounds Chemical class 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000002365 multiple layer Substances 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
Abstract
A method and device for automatically controlling the temperature of optical fiber coatings are disclosed. The device comprises an optical fiber coating device (3) provided with a heating chamber (4), wherein the heating chamber (4) of the optical fiber coating device (3) is communicated with a circular heater (7) through a circulating pipeline (5). Liquid heat-conducting media (8) is filled in the heating chamber (4), the circulating pipeline (5) and the circular heater (7), and the circular heater (7) is used for heating coating (2) in the optical fiber coating device (3) by circularly heating the liquid heat-conducting media (8). A processing control unit is arranged for controlling the heating process of the circular heater (7) by acquiring a wire drawing speed sensing signal and a liquid heat-conducting medium temperature sensing signal and comparing the signals with preset parameter values. Thus the automatic control and adjusting process for the temperature of the coating in the optical fiber coating device (3) is realized.
Description
METHOD AND DEVICE FOR AUTOMATICALLY CONTROLLING TEMPERATURE OF OPTICAL FIBER COATINGS
TECHNIC AL FIELD
The présent application relates to a method and an apparatus for automatically controlling the température of optical fiber coating, which belongs to the field of the optical fiber processing technology.
BACKGROUND
In a wiredrawing process of an optical fiber, multiple layers of coatings should be coated on the surface of the optical fiber, in order to protect the surface of the optical fiber made of glass. The coating layers on the optical fiber are formed by coating optical fiber coating that is made from high polymer colophony compound material; wherein the optical fiber coating is liquid at room température. The viscosity of the coating is changed with the variation of the température. In order to achieve a better quality of the coating layers on the surface of the optical fiber, the viscosity and température of the coating, and the wiredrawing speed should be well matched with each other.
During the wiredrawing process, with the increase of the wiredrawing speed, the coating consume rate also increases, which leads to that the coating flow rate needs to be increased correspondingly. Heating the coating is the feasible way to increase the coating flow rate because of the decrease of viscosity. A traditional heating method for increasing the température of the coating is a heating method having a constant température. In this case, fîrstly, an external heating device is used for heating liquid (for example, liquid water or minerai oil); then the coating container is circularly heated by a liquid, and the coating container in tums heats i
the coating. During this wiredrawing process, the température of the coating keeps constant. , If the température of the coating is too high at a low wiredrawing speed, the coating may be overflowed, or the coating diameter may be overlaige, which results in a scrapped optical fiber. If the température of the coating is too low at a high wiredrawing speed, coating defects such as non-uniform coating, ripple presented on the coating interface and the like may be caused. With the development of the optical fiber manufacturing technology, the wiredrawing speed of the optical fiber becomes faster. At présent, the wiredrawing speed is generally more than 1500m/min. In this case, it is more and more diffîcult to meet the requirements for the coating process of the coating during a high speed wiredrawing process, when using the traditional heating method having a constant température. And thus, the coating quality of the optical fiber is hardly guaranteed. During the high speed wiredrawing process, overflowing of coating, coating defects and the like are getting worse, which become signifîcant barriers to the increase of the wiredrawing speed.
DISCLOURE OF THE PRESENT APPLICATION
TECHNICAL PROBLEMS
The objective of the présent application is to provide a method and an apparatus for automatically controliing the température of optical fiber coating, aiming at the above disadvantages in the prior art. In this way, the température of the coating can be automatically changed along with the wiredrawing speed, so that the température (or the viscosity) of the coating can be well matched with the wiredrawing speed, and thus the quality of the coating layers on the surface of the optical fiber can be guaranteed.
SOLUTIONSTO TECHNICAL PROBLEMS
TECHNICAL SOLUTIONS
To solve the technical problems stated above, in one aspect, the présent application provides a method for automatically controlling the température of optical fiber coating, which uses an optical fiber coating device provided with a heating chamber; wherein the heating chamber of the optical fiber coating device is communicated with a circular heater through a circulating pipeline; the heating chamber, the circulating pipeline and the circular heater are filled with liquid heat-conducting medium; and the circular heater is used for heating coating in the optical fiber coating device by circularly heating the liquid heat-conducting medium; wherein a processing control unit is arranged for controlling the heating process of the circular heater by acquiring a wiredrawing speed sensing signal and a liquid heat-conducting medium température sensing signal, and comparing the signais with présent parameter values, and thus the automatic controlling and adjusting process for the température of the coating in the optical fiber coating device is realized.
In this embodiment, the processing control unit is a PLC unit which is equipped with a program defining a corresponding relationship between a wiredrawing speed and a température of the liquid heat-conducting medium; and the heating of the circular heater is capable of being automatically adjusted with the variation of the wiredrawing speed under the control of the program of the PLC unit.
In this embodiment, the température of the liquid heat-conducting medium that is automatically adjusted by the circular heater ranges from 25-100’C.
In this embodiment, the liquid heat-conducting medium is water, minerai oil or other liquid materials.
In this embodiment, the coating method for the optical fiber is a wet-on-wet coating method or a wet-on-dry coating method.
In this embodiment, a heating method of the circular heater is an electrical heating method.
In this embodiment, the wiredrawing speed of the optical fiber set in the program of the PLC unit ranges from 0~3000m/min.
In another aspect, the présent application also provides an apparatus for automatically controlling the température of optical fiber coating, which comprises an optical fiber coating device provided with a heating chamber; wherein the heating chamber of the optical fiber coating device is communicated with a circular heater through a circulating pipeline; the heating chamber, the circulating pipeline and the circular heater are filled with liquid heat-conducting medium; wherein a PLC unit is provided; an input of the PLC unit is connected to a wiredrawing speed sensor and a température sensor for the liquid heat-conducting medium respectively; and an output of the PLC unit is connected to a température control circuit of the circular heater.
In this embodiment, the wiredrawing speed sensor is mounted on a traction wheel at a wiredrawing output; and the température sensor for the liquid heat-conducting medium is mounted in a liquid chamber of the circular heater.
In this embodiment, a liquid chamber is arranged in the circular heater, wherein an electrical heating device and the température sensor for the liquid heat-conducting medium are arranged in the liquid chamber; and the circular heater is further provided with a température control circuit.
In this embodiment, one or two pairs of the optical fiber coating device and the circular heater are provided.
ADVANTAGEOUS EFFECTS OF THE PRESENT APPLICATION
ADVANTAGEOUS EFFECTS
When implementing the présent application, the following advantageous effects can be achieved: 1. The température of the circular heater can be automatically adjusted along with the wiredrawing speed with the aid of the PLC; in this way, the température of the coating can be automatically adjusted along with the wiredrawing speed, so that the viscosity of the coating can be well matched with the wiredrawing speed. In the wiredrawing process, this way of automatically adjusting the température of the coating on one hand can randomly adjust the viscosity of the coating in each coating chamber, and thus the thickness, the ratio and the diameter of the optical fiber coating layers can be conveniently adjusted. On the other hand, the scrapping of the optical fiber resulted from overflowing of the coating, overlarge coating diameter, non-uniform coating and ripple presented on the coating interface can be reduced and prevented from occurring. Therefore, the quality of the coating layers on the surface of the optical fiber can be guaranteed and improved. Furthermore, the machining yield of the optical fiber can be improved. 2. The apparatus in the présent application has a simple structure and is convenient for implement and promotion, and thus the automation level of the optical fiber processing equipment can be improved.
BRIEF DESCRIPTION OF THE DRAWINGS
DESCRIPTION OF THE DRAWINGS
FIG 1 is a graphie view showing the corresponding relationships among the viscosity of the coating, the wiredrawing speed and the température of the coating;
FIG 2 is a schematic view showing a wiredrawing process of an optical fiber according to one embodiment of the présent application; and
FIG 3 is a schematic view showing an apparatus for automatically controlling the température of a coating according to one embodiment of the présent application.
THE PREFERRED EMBODIMENT OF THE PRESENT APPLICATION
THE EMBODIMENT OF THE PRESENT APPLICATION
Spécial Embodiments
The embodiments according to the présent application will now be described in detail with reference to the accompanying drawings.
As shown in FIG 2, a wiredrawing process of an optical fiber includes: a glass preform 15 is heated and soften in a drawing fumace 14 to form an optical fiber 1. After the optical fiber has been cooled down and formed, the optical fiber enters into an optical fiber coating device 3. The optical fiber coating device is heated by a circular heater 7 through circularly heating liquid heat-conducting media in a circulating pipeline, in order to control the température of the optical fiber coating device. An association between a température sensing signal of the circular heater and a speed sensing signal of a traction wheel 11 is established by a PLC unit 10. In this case, a température controlling process of the circular heater may directly affect the quality of the coating layers of the optical fiber. After the surface of the optical fiber is coated with coating, the optical fiber enters into a curing device 13 for the curing of the coating layers. After cured, the optical fiber is conveyed to a take-up wheel 12 through the traction wheel 11, and thus the manufacturing process of the optical fiber is fînished.
As shown in FIG 3, an apparatus according to this embodiment comprises an optical fiber coating device 3 provided with a heating chamber 4; wherein the middle of the optical fiber coating device is a coating chamber in which has coatings 2 contained. An optical fiber 1 runs through the coating chamber of the optical fiber coating device. A heating chamber of the optical fiber coating device is communicated with a circular heater 7 through a circulating pipeline 5. In this case, the heating chamber, the circulating pipeline and the circular heater are filled with liquid heat-conducting medium; wherein the liquid heat-conducting medium is minerai oil. A PLC unit 10 is provided, wherein an input of the PLC unit is connected to a wiredrawing speed sensor and a température sensor for the liquid heat-conducting medium. In this case, the température sensor for the liquid heat-conducting medium is arranged in a liquid chamber of the circular heater. An output of the PLC unit is in tums connected to a température control circuit 6. In this case, the liquid chamber is arranged in the circular heater, wherein an electrical heating device 9 and the température sensor for the liquid heat-conducting medium are respectively arranged at the bottom of the liquid chamber; and the circular heater is provided with a température control circuit. Besides, the optical fiber coating device and the circular heater are arranged in pairs; in this case, one or two pairs of the optical fiber coating device and the circular heater are provided.
The automatically controlling process of the température of the coating comprises the following steps: firstly, the liquid heat-conducting medium is heated by the circular heater. After heated, the liquid heat-conducting medium is conveyed to the heating chamber of the coating device through the circulating pipeline, in order to heat the coating. After the heat of the liquid heating-conducting medium is released, the liquid heat-conducting medium is back flowed into the circular heater through the circulating pipeline and is heated again. In this way, the liquid heat-conducting medium heats the coating circularly. The température of the liquid heat-conducting medium is controlled by the température control circuit. In this case, the corresponding relationshlp between the température sensing signal and the speed sensing signal of the traction wheel is established by the PLC unit. In this way, the température of the circular heater can be automatically controlled with the variation of the wiredrawing speed.
In this embodiment, the corresponding relationship between the température of the circular heater and the wiredrawing speed is set as shown in table 1. Different température points of the circular heater are set on a control interface in light of different wiredrawing speed points. In this way, the température of the circular heater can be automatically adjusted along with the wiredrawing speed. Before the start of the wiredrawing process, the wiredrawing speed is zéro, and the température of the circular heater is 50 □. When the wiredrawing speed rises to 600m/min, the température of the circular heater automatically increases from 50 □ to 52 □. And the subséquent température of the circular heater is automatically adjusted with the wiredrawing speed by analogy.
Therefore, the température (or viscosity) of the coating is well matched with the wiredrawing speed, as shown in FIG 1.
Tablel [Table 1]
| Wiredrawing Speed (m/min) | Preset Température of Circular Heater(°C) |
| 0 | 50 |
| 600 | 52 |
| 800 | 54 |
| 1000 | 57 |
| 1200 | 61 |
| 1400 | 63 |
| 1500 | 65 |
| 1600 | 67 |
| 1700 | 69 |
| 1800 | 71 |
Claims (10)
1. A method for automatically controlling the température of optical fîber coating, using an optical fîber coating device provided with a heating chamber; wherein the heating chamber of the optical fîber coating device is communicated with a circular heater through a circulating pipeline; the heating chamber, the circulating pipeline and the circular heater are filled with liquid heat-conducting medium; and the circular heater is used for heating coating in the optical fîber coating device by circularly heating the liquid heat-conducting medium; wherein a processing control unit is arranged for controlling the heating process of the circular heater by acquiring a wiredrawing speed sensing signal and a liquid heat-conducting medium température sensing signal, and comparing the signais with présent parameter values, and thus the automatic controlling and adjusting process for the température of the coating in the optical fîber coating device is realized.
2. The method for automatically controlling the température of optical fîber coating according to claim 1, wherein the processing control unit is a PLC unit which is equipped with a program defining a corresponding relationship between a wiredrawing speed and a température of the liquid heat-conducting medium; and the heating of the circular heater is capable of being automatically adjusted with the variation of the wiredrawing speed under the control of the program of the PLC unit.
3. The method for automatically controlling the température of optical fîber coating according to claim 1 or 2, wherein the température of the liquid heat-conducting medium that is automatically adjusted by the circular heater ranges from 25-100Π.
4. The method for automatically controlling the température of optical fîber coating according to claim 1 or 2, wherein the liquid heat-conducting medium is water, minerai oil or other liquid materials.
5. The method for automatically controlling the température of optical fiber coating according to claim 1 or 2, wherein the coating method for the optical fiber is a wet-on-wet coating method or a wet-on-dry coating method.
6. The method for automatically controlling the température of optical fiber coating according to claim 2, wherein the wiredrawing speed of the optical fiber set in the program of the PLC unit ranges from 0~3000m/min.
7. An apparatus for automatically controlling the température of optical fiber coating, comprising an optical fiber coating device provided with a heating chamber; wherein the heating chamber of the optical fiber coating device is communicated with a circular heater through a circulating pipeline; the heating chamber, the circulating pipeline and the circular heater are fîlled with liquid heat-conducting medium; wherein a PLC unit is provided; an input of the PLC unit is connected to a wiredrawing speed sensor and a température sensor for the liquid heat-conducting medium respectively; and an output of the PLC unit is connected to a température control circuit of the circular heater.
8. The apparatus for automatically controlling the température of optical fiber coating according to claim 7, wherein the wiredrawing speed sensor is mounted on a traction wheel at a wiredrawing output; and the température sensor for the liquid heat-conducting medium is mounted in a liquid chamber of the circular heater.
9. The apparatus for automatically controlling the température of optical fiber coating according to claim 7 or 8, wherein a liquid chamber is arranged in the circular heater, wherein an electrical heating device and the température sensor for the liquid heat-conducting medium are arranged in the liquid chamber; and the circular heater is further provided with a température control circuit.
10. The apparatus for automatically controlling the température of optical fiber coating according to claim 7 or 8, wherein one or two pairs of the optical fiber coating device and the circular heater are provided.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210200665.8 | 2012-06-18 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| OA17232A true OA17232A (en) | 2016-04-20 |
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