CN112794637A - MCVD blowtorch online adjusting device and adjusting method thereof - Google Patents
MCVD blowtorch online adjusting device and adjusting method thereof Download PDFInfo
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- CN112794637A CN112794637A CN202110036960.3A CN202110036960A CN112794637A CN 112794637 A CN112794637 A CN 112794637A CN 202110036960 A CN202110036960 A CN 202110036960A CN 112794637 A CN112794637 A CN 112794637A
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- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B37/00—Manufacture or treatment of flakes, fibres, or filaments from softened glass, minerals, or slags
- C03B37/01—Manufacture of glass fibres or filaments
- C03B37/012—Manufacture of preforms for drawing fibres or filaments
- C03B37/014—Manufacture of preforms for drawing fibres or filaments made entirely or partially by chemical means, e.g. vapour phase deposition of bulk porous glass either by outside vapour deposition [OVD], or by outside vapour phase oxidation [OVPO] or by vapour axial deposition [VAD]
- C03B37/018—Manufacture of preforms for drawing fibres or filaments made entirely or partially by chemical means, e.g. vapour phase deposition of bulk porous glass either by outside vapour deposition [OVD], or by outside vapour phase oxidation [OVPO] or by vapour axial deposition [VAD] by glass deposition on a glass substrate, e.g. by inside-, modified-, plasma-, or plasma modified- chemical vapour deposition [ICVD, MCVD, PCVD, PMCVD], i.e. by thin layer coating on the inside or outside of a glass tube or on a glass rod
- C03B37/01807—Reactant delivery systems, e.g. reactant deposition burners
- C03B37/01815—Reactant deposition burners or deposition heating means
- C03B37/01823—Plasma deposition burners or heating means
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- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B2207/00—Glass deposition burners
- C03B2207/50—Multiple burner arrangements
-
- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B2207/00—Glass deposition burners
- C03B2207/60—Relationship between burner and deposit, e.g. position
- C03B2207/64—Angle
-
- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B2207/00—Glass deposition burners
- C03B2207/70—Control measures
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- Chemical Kinetics & Catalysis (AREA)
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- General Life Sciences & Earth Sciences (AREA)
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- Organic Chemistry (AREA)
- Manufacture, Treatment Of Glass Fibers (AREA)
Abstract
The invention relates to an MCVD blowtorch online adjusting device and an MCVD blowtorch online adjusting method, and belongs to the technical field of special optical fibers. The device comprises a plurality of groups of rotatable support units and calibration rods, wherein the calibration rods are horizontally and transversely arranged, a thermal imager is arranged right below the calibration rods, and the plurality of groups of rotatable support units are uniformly distributed below the calibration rods; the rotatable support units form a group, the rotatable support units forming the group are symmetrically arranged on two sides of the calibration rod, any rotatable support unit is respectively provided with a blowtorch, and the rotatable support units adjust the spraying angle of the blowtorch so that the blowtorch respectively faces the calibration rod; the rotatable support unit can move transversely parallel to the calibration rod, and the transverse position of the blast burner can be adjusted. Guaranteed the uniformity of every blast lamp gas flow in this application, through control system on-line adjustment blast lamp position, guaranteed that the heat of blast lamp flame concentrates at inside lining pipe surface central point and puts, avoided the phenomenon that the distortion appears in the interior lining pipe of deposition process.
Description
Technical Field
The invention relates to an MCVD blowtorch online adjusting device and an MCVD blowtorch online adjusting method, and belongs to the technical field of special optical fibers.
Background
MCVD is an important device for preparing special optical fibers, and has unique advantages in the aspect of preparing active optical fibers. The heat source of MCVD consists of several quartz torches, and each torch is filled with hydrogen and oxygen to form oxyhydrogen flame, which provides heat source for deposition reaction inside the lining tube. During the use process, the temperature distribution of the surface of the lining pipe is controlled by adjusting parameters such as the position and the angle of the blast burner.
In a conventional MCVD apparatus, a blowtorch is uniformly fixed on a bracket in a circular arc shape by taking an inner liner tube as a center, and the bracket is fixed on an MCVD lathe and is positioned right below an inner liner tube. The support is generally integrally formed, namely a branch is branched from a main pipeline, and each branch is connected with a blast lamp. This design has the following drawbacks:
1. in the actual production process, because the processing precision of the blowtorch and the gas flow are different, a high-temperature area formed by each blowtorch is not concentrated on the surface of the lining pipe, and the blowtorch bracket need to be finely adjusted. If not fine-tuned, the inner lining tube will have helical distortion during deposition, which affects the quality of the preform and may lead to scrap seriously. If the fine adjustment is carried out manually, the operating personnel are easily burnt and scalded when the reaction temperature of the blast lamp reaches over 1000 ℃ because of the manual fine adjustment.
2. In the adjusting process of the torch support, the flame centering condition is generally judged by naked eyes, but due to the deviation of human vision, the adjusting result of different people may be different, and a quantifiable standard is lacked.
3. Traditional MCVD supporting structure divides the branch road on a trunk line, and a blowtorch is connected to every branch road, generally only installs MFC (mass flow meter) on the trunk line, and the flow of unable accurate control every blowtorch leads to temperature, the area of each blowtorch high temperature area, to there being the difference in the distance on blowtorch surface, is unfavorable for the heat concentration on interior bushing pipe surface.
Disclosure of Invention
The invention aims to solve the technical problem of providing an MCVD (modified chemical vapor deposition) blowtorch online adjusting device and an MCVD blowtorch online adjusting method aiming at the prior art, which not only can adjust the position of a blowtorch online, but also can ensure the consistency of the gas flow of each blowtorch.
The technical scheme adopted by the invention for solving the problems is as follows: an MCVD blowtorch online adjusting device comprises a plurality of groups of rotatable support units and calibration rods, wherein the calibration rods are horizontally and transversely arranged, a thermal imager is arranged right below the calibration rods, and the plurality of groups of rotatable support units are uniformly distributed below the calibration rods; the rotatable support units form a group, the rotatable support units forming the group are symmetrically arranged on two sides of the calibration rod, any rotatable support unit is respectively provided with a blowtorch, and the rotatable support units can adjust the spraying angle of the blowtorch to enable the blowtorch to respectively face the calibration rod; the rotatable bracket unit can transversely move parallel to the calibration rod to realize the adjustment of the transverse position of the blast lamp;
each can change formula support unit includes the rotatable formula support of two parallel arrangement respectively, can change formula support and be the cavity formula structure, one can change formula support inner chamber as oxygen passageway, another can change formula support inner chamber as hydrogen passageway, oxygen passageway and hydrogen passageway communicate with the blowtorch respectively for oxygen and hydrogen provide gaseous raw materials in letting in the blowtorch, for the blowtorch.
And the rotatable supports are respectively provided with a mass flow meter.
Rotatable formula support includes carriage release lever and rotary rod respectively, the vertical setting of carriage release lever, the articulated rotary rod in carriage release lever top, just carriage release lever inner chamber and rotary rod inner chamber intercommunication, on the rotary rod was located to the blowtorch, when the rotary rod is rotatory, drives the blowtorch synchronous revolution.
The blowlamps on the rotatable support units are arranged on the same circumference, and the calibration rod is positioned at the circle center of the circumference.
And the circumferential angle alpha between every two adjacent blowlamps is 5-36 degrees.
The rotatable support unit is arranged on the linear guide rail and is in sliding fit with the linear guide rail.
Still be equipped with the locking unit, the locking unit includes the locking seat, the carriage release lever and rotary rod junction are located to the locking seat, the locking seat has the support that two relative intervals set up, and two supports are located respectively the rotary rod both sides, two locking screw hole is seted up to the symmetry on the support, locking screw hole is downthehole to be twisted from outside-in respectively and is locked the bolt, through both sides locking bolt is relative supports the rotary rod in order to lock the rotary rod.
The calibration rod is made of opaque high-temperature-resistant materials, and the diameter of the calibration rod is consistent with the outer diameter of the lining pipe.
An MCVD blowtorch online adjusting method comprises the following steps:
the method comprises the following steps: before the blowtorch is ignited, the rotating rod is rotated, the angle of each blowtorch opposite to the calibration rod is adjusted, so that the blowtorch is aligned to the center of the calibration rod and is uniformly distributed around the calibration rod, the distance from each blowtorch to the center of the calibration rod is ensured to be equal, and the rotating rod is locked through the locking unit;
step two: igniting the lowest group of blowlamps, setting the gas flow of the two blowlamps to be the same, and observing the position of the high-temperature area on the surface of the calibration rod relative to the center of the calibration rod through a thermal imager; if the high-temperature area on the surface of the calibration rod deviates from the center of the calibration rod, the control system controls the linear guide rail of the rotatable support unit where the corresponding blowtorch is located to move, so that the rotatable support unit can move transversely, the transverse position of the corresponding blowtorch is adjusted on line, and the innermost group of blowtorches is adjusted to the center of the calibration rod in the high-temperature area on the surface of the calibration rod.
Step three: the transverse position of each group of blowtorch is adjusted from inside to outside in sequence, and the high-temperature area of each group of blowtorch on the surface of the calibration rod is ensured to be positioned at the center of the calibration rod;
step four: and after the adjustment of each group of blowlamps is finished, taking away the calibration rod.
Compared with the prior art, the invention has the advantages that: an MCVD blowtorch on-line adjusting device and an adjusting method thereof,
1. the gas flow of each blowtorch in this application has guaranteed the uniformity of every blowtorch gas flow by the mass flow meter control that corresponds for the distance on each blowtorch high-temperature region to blowtorch surface is unanimous, favourable messenger's blowtorch heat concentrates at interior bushing pipe surface center.
2. After ignition, the position of the blast burner is adjusted on line through the control system, so that the burning and scalding of operators are reduced, the heat of flame of the blast burner is ensured to be concentrated at the central position of the surface of the lining pipe, and the phenomenon that the lining pipe is distorted in the deposition process is effectively avoided.
3. The use of an opaque calibration rod, such as an alumina ceramic rod, in this application, through use in conjunction with a thermal imager, clearly presents the temperature profile of the calibration rod surface, providing a quantifiable standard for adjusting the position of the torch.
Drawings
Fig. 1 is a schematic view of an MCVD torch on-line adjusting device according to an embodiment of the present invention;
FIG. 2 is a front view of FIG. 1;
FIG. 3 is a schematic view of a locking unit;
in the figure, 1 calibration rod, 2 blowtorch, 3 rotatable bracket, 3.1 movable rod, 3.2 rotary rod, 3.3 soft joint, 4 thermal imaging camera, 5 linear guide rail, 6 locking seat and 6.1 locking threaded hole.
Detailed Description
The invention is described in further detail below with reference to the accompanying examples.
As shown in fig. 1 and 2, the MCVD torch on-line adjusting apparatus in this embodiment includes 3 sets of rotatable support units and a cylindrical calibration rod 1, and the diameter of the calibration rod 1 is the same as the outer diameter of the lining tube in the MCVD manufacturing process. A thermal imaging instrument 4 is arranged under the calibration rod 1, and 3 groups of rotatable support units are uniformly distributed under the calibration rod 1. Any group of rotatable support units comprises two rotatable support units, the two rotatable support units are symmetrically arranged on two sides of the calibration rod 1, the blast lamps 2 are respectively arranged on any rotatable support unit, and the blast lamps 2 respectively face the calibration rod 1. The 6 rotatable support units are arc-shaped and uniform, and the distance between the top end face of each rotatable support unit and the central shaft of the calibration rod 1 is the same, so that the 6 blowlamps 2 are arranged on the same circumference, and the included angle alpha between every two adjacent blowlamps 2 is 5-36 degrees. Rotatable formula support unit locates on linear guide 5, and linear guide 5 drive rotatable formula support unit can be respectively relative calibration stick 1 lateral shifting, drives corresponding blowtorch 2 synchronous motion, adjusts the lateral position of blowtorch 2.
The rotatable support unit comprises two rotatable supports 3 which are vertically arranged in parallel, the two rotatable supports 3 are hollow structural members, the inner cavity of one rotatable support 3 serves as an oxygen channel, the inner cavity of the other rotatable support 3 serves as a hydrogen channel, and the two oxygen channels and the hydrogen channel are communicated with the blowtorch 2 respectively, so that oxygen in the oxygen channel and hydrogen in the hydrogen channel are introduced into the blowtorch 2 respectively to provide gas raw materials for the blowtorch 2.
Any rotatable bracket 3 is respectively provided with a mass flow meter, so that the gas flow in each rotatable bracket 3 can be accurately controlled.
As shown in fig. 3, rotatable support 3 includes carriage release lever 3.1 and rotary rod 3.2 respectively, and the vertical setting of carriage release lever 3.1 is on linear guide 5, and the carriage release lever 3.1 top is connected rotary rod 3.2 through soft joint 3.3, and soft joint 3.3 not only makes carriage release lever 3.1 inner chamber and rotary rod 3.2 inner chamber communicate, can drive rotary rod 3.2 rotatory moreover. The blowtorch 2 is fixed in on the rotary rod 3.2, when the rotary rod 3.2 was rotatory, drives 2 synchronous rotations of blowtorch for 2 can rotate wantonly by the blowtorch. Establish locking seat 6 at the cover on carriage release lever 3.1, locking seat 6 locates carriage release lever 3.1 and rotary rod 3.2 junction, and locking seat 6 has the support that two relative intervals set up, and two supports are located rotary rod 3.2 both sides respectively, and locking screw hole 6.1 is seted up to the symmetry on two supports, twists locking bolt from outside-in respectively in the locking screw hole 6.1, supports rotary rod 3.2 through the relative support of both sides locking bolt with locking rotary rod 3.2. In order to better engage the locking bolt with the rotary lever 3.2, the end face of the locking bolt can be designed as an internal recess corresponding to the rotary lever.
The calibration rod 1 is made of alumina.
There is a height difference between the different sets of rotatable support units and the linear guides 5 of the two rotatable support units of the same set are at the same height. The distance between the height of the linear guide 5 of the innermost rotatable bracket unit and the height of the linear guide 5 of the adjacent rotatable bracket unit is a, and a is 50-200 mm. The linear guide rail 5 of the rotatable support unit at the outermost side is separated from the linear guide rail 5 of the rotatable support unit at the innermost side by a distance of b, and b is 2a, so that the linear guide rails 5 are not affected by each other due to the limitation of the installation space, and the installation of the linear guide rails 5 is facilitated.
An MCVD blowtorch on-line adjusting method comprises the following steps:
the method comprises the following steps: before the blowtorch 2 igniteed, rotate soft joint 3.3 for rotary rod 3.2 rotates, adjusts the spray angle of blowtorch 2, makes blowtorch 2 aim at calibration stick 1 center and be convex evenly distributed around calibration stick 1, guarantees that each blowtorch 2 goes up and equal with the distance at calibration stick 2 center, and locks rotary rod 3.2 through the locking unit.
Step two: igniting the lowest group of the blowlamps 2, setting the gas flow of the two blowlamps 2 to be the same, and observing the position of a high-temperature area on the surface of the calibration rod 1 relative to the center of the calibration rod through a thermal imager 4; if the high-temperature area on the surface of the calibration rod deviates from the center of the calibration rod, the control system controls the corresponding group of linear guide rails 5 to act to drive the corresponding rotatable support unit to move transversely, and the transverse position of the corresponding blowtorch 2 is adjusted on line, so that the group of blowtorches 2 at the lowest position is positioned at the center of the calibration rod at the high-temperature area on the surface of the calibration rod.
Step three: igniting a group of adjacent torches 2 of the torches in the step two, and setting the gas flow of the two torches 2 to be the same as the gas flow of the torches in the step two; observing the position of a high-temperature area on the surface of the calibration rod relative to the center of the calibration rod through a thermal imager 4; if the high-temperature area on the surface of the calibration rod deviates from the center of the calibration rod, the control system controls the corresponding group of linear guide rails to act to drive the corresponding rotatable support unit to move transversely, and the transverse position of the corresponding blowtorch is adjusted on line, so that the group of blowtorches is positioned at the center of the calibration rod in the high-temperature area on the surface of the calibration rod.
Step four: igniting the uppermost group of blowlamps, and setting the gas flow of the two blowlamps to be the same as that of the blowlamps in the step two; observing the position of a high-temperature area on the surface of the calibration rod relative to the center of the calibration rod through a thermal imager; if the high-temperature area on the surface of the calibration rod deviates from the center of the calibration rod, the control system controls the corresponding group of linear guide rails to act to drive the corresponding rotatable support unit to move transversely, and the transverse position of the corresponding blowtorch is adjusted, so that the uppermost group of blowtorches are sprayed on the high-temperature area on the surface of the calibration rod and are positioned at the center of the calibration rod.
Step five: and after the adjustment of each group of blowlamps is finished, taking away the calibration rod.
After the adjustment, the heat of the flame of the blast burner is ensured to be concentrated at the central position of the surface of the lining pipe, and the phenomenon that the lining pipe is distorted in the deposition process is effectively avoided.
The gas flow of each blowtorch in this application has guaranteed the uniformity of every blowtorch gas flow by the mass flow meter control that corresponds for the distance on each blowtorch high-temperature region to blowtorch surface is unanimous, favourable messenger's blowtorch heat concentrates at interior bushing pipe surface center. After ignition, the position of the blast lamp is adjusted on line through the control system, so that the burn and scald of operators are reduced. The calibration rod made of quartz glass is generally used, and the adjustment of the torch and the torch holder is carried out after the visual observation, but the adjustment results of different people can be different due to the visual deviation of people, and a quantifiable standard is lacked. The use of an opaque calibration rod, such as an alumina ceramic rod, in this application, through use in conjunction with a thermal imager, clearly presents the temperature profile of the calibration rod surface, providing a quantifiable standard for adjusting the position of the torch.
In addition to the above embodiments, the present invention also includes other embodiments, and any technical solutions formed by equivalent transformation or equivalent replacement should fall within the scope of the claims of the present invention.
Claims (9)
1. The utility model provides a MCVD blast burner on-line adjusting device which characterized in that: the calibration rod comprises a plurality of groups of rotatable support units and calibration rods (1), wherein the calibration rods (1) are horizontally and transversely arranged, a thermal imager (4) is arranged under the calibration rods (1), and the plurality of groups of rotatable support units are uniformly distributed below the calibration rods (1); the two rotatable support units form a group, the two rotatable support units forming the group are symmetrically arranged on two sides of the calibration rod (1), any rotatable support unit is respectively provided with a blowtorch (2), and the rotatable support units can adjust the spraying angle of the blowtorch (2) to enable the blowtorch (2) to respectively face the calibration rod (1); the rotatable support unit can move relative to the calibration rod (1) to realize the distance adjustment of the blowtorch (2) relative to the calibration rod;
each rotatable support unit includes rotatable support (3) of two parallel arrangement respectively, rotatable support (3) are the cavity formula structure, one rotatable support (3) inner chamber is as oxygen passageway, another rotatable support (3) inner chamber is as the hydrogen passageway, oxygen passageway and hydrogen passageway communicate with blowtorch (2) respectively for oxygen and hydrogen let in blowtorch (2), provide the gaseous raw materials of oxyhydrogen flame for blowtorch (2).
2. An MCVD torch on-line adjusting device according to claim 1, wherein: and flowmeters are respectively arranged on the rotatable supports (3).
3. An MCVD torch on-line adjusting apparatus according to claim 2, wherein: rotatable formula support (3) are including carriage release lever (3.1) and rotary rod (3.2) respectively, the vertical setting of carriage release lever (3.1), articulated rotary rod (3.2) in carriage release lever (3.1) top, just carriage release lever (3.1) inner chamber and rotary rod (3.2) inner chamber intercommunication, on rotary rod (3.2) was located in blast burner (2), work as when rotary rod (3.2) is rotatory, drive blast burner (2) synchronous revolution.
4. An MCVD torch on-line adjusting device according to claim 1, wherein: the blast lamps (2) on the rotatable support units are arranged on the same circumference, and the calibration rod (1) is positioned at the circle center of the circumference.
5. An MCVD burner online adjusting device according to claim 4, characterized in that: the circumferential angle alpha between the adjacent blowlamps (2) is 5-36 degrees.
6. An MCVD torch on-line adjusting device according to claim 1, wherein: the rotatable support unit is arranged on the linear guide rail (5) and is in sliding fit with the linear guide rail (5).
7. An MCVD burner online adjusting device according to claim 3, characterized in that: still be equipped with the locking unit, the locking unit is including locking seat (6), carriage release lever (3.1) and rotary rod (3.2) junction are located in locking seat (6), locking seat (6) have the support that two relative intervals set up, and two supports are located respectively rotary rod (3.2) both sides, two locking screw hole (6.1) are seted up to the symmetry on the support, twist locking bolt from the extroversion in locking screw hole (6.1) respectively, through both sides locking bolt is relative supports rotary rod (3.2) with the locking rotary rod (3.2).
8. An MCVD torch on-line adjusting device according to claim 1, wherein: the calibration rod (1) is made of opaque high-temperature-resistant materials, and the diameter of the calibration rod (1) is consistent with the outer diameter of the lining pipe.
9. An adjustment method of an MCVD torch online adjustment device according to any of claims 1-9, characterized in that: the adjusting method comprises the following steps:
the method comprises the following steps: before the blowtorch is ignited, the rotating rod is rotated, the angle of each blowtorch opposite to the calibration rod is adjusted, so that the blowtorch is aligned to the center of the calibration rod and is uniformly distributed around the calibration rod, the distance from each blowtorch to the center of the calibration rod is ensured to be equal, and the rotating rod is locked through the locking unit;
step two: igniting the lowest group of blowlamps, setting the gas flow of the two blowlamps to be the same, and observing the position of the high-temperature area on the surface of the calibration rod relative to the center of the calibration rod through a thermal imager; if the high-temperature area on the surface of the calibration rod deviates from the center of the calibration rod, the control system controls the linear guide rail of the rotatable support unit where the corresponding blowtorch is located to move, so that the rotatable support unit can move transversely, the transverse position of the corresponding blowtorch is adjusted on line, and the innermost group of blowtorches is adjusted to the center of the calibration rod in the high-temperature area on the surface of the calibration rod.
Step three: the transverse position of each group of blowtorch is adjusted from inside to outside in sequence, and the high-temperature area of each group of blowtorch on the surface of the calibration rod is ensured to be positioned at the center of the calibration rod;
step four: and after the adjustment of each group of blowlamps is finished, taking away the calibration rod.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110036960.3A CN112794637A (en) | 2021-01-12 | 2021-01-12 | MCVD blowtorch online adjusting device and adjusting method thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110036960.3A CN112794637A (en) | 2021-01-12 | 2021-01-12 | MCVD blowtorch online adjusting device and adjusting method thereof |
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| CN112794637A true CN112794637A (en) | 2021-05-14 |
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|---|---|---|---|---|
| CN2557813Y (en) * | 2002-07-10 | 2003-06-25 | 江苏法尔胜光子有限公司 | Hydrogen-oxygen flame burner for quartz glass |
| CN104649577A (en) * | 2015-02-12 | 2015-05-27 | 江苏通鼎光棒有限公司 | Device and method for adjusting flame temperature of VAD and OVD on line |
| CN106430942A (en) * | 2016-09-28 | 2017-02-22 | 长飞光纤光缆股份有限公司 | Three-direction adjustable thermal-insulation blast burner applicable to OVD (outside vapor deposition) process |
| CN109678337A (en) * | 2019-02-20 | 2019-04-26 | 无锡市凯灵电子有限公司 | A kind of blowtorch mechanism producing preform |
| CN109694185A (en) * | 2019-01-07 | 2019-04-30 | 烽火通信科技股份有限公司 | A kind of blowtorch suitable for VAD method deposition |
| CN215288525U (en) * | 2021-01-12 | 2021-12-24 | 江苏法尔胜光子有限公司 | MCVD blowtorch on-line adjusting device |
-
2021
- 2021-01-12 CN CN202110036960.3A patent/CN112794637A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2557813Y (en) * | 2002-07-10 | 2003-06-25 | 江苏法尔胜光子有限公司 | Hydrogen-oxygen flame burner for quartz glass |
| CN104649577A (en) * | 2015-02-12 | 2015-05-27 | 江苏通鼎光棒有限公司 | Device and method for adjusting flame temperature of VAD and OVD on line |
| CN106430942A (en) * | 2016-09-28 | 2017-02-22 | 长飞光纤光缆股份有限公司 | Three-direction adjustable thermal-insulation blast burner applicable to OVD (outside vapor deposition) process |
| CN109694185A (en) * | 2019-01-07 | 2019-04-30 | 烽火通信科技股份有限公司 | A kind of blowtorch suitable for VAD method deposition |
| CN109678337A (en) * | 2019-02-20 | 2019-04-26 | 无锡市凯灵电子有限公司 | A kind of blowtorch mechanism producing preform |
| CN215288525U (en) * | 2021-01-12 | 2021-12-24 | 江苏法尔胜光子有限公司 | MCVD blowtorch on-line adjusting device |
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