CN108483894A - Hang bar device and drawing optical fibers production system - Google Patents
Hang bar device and drawing optical fibers production system Download PDFInfo
- Publication number
- CN108483894A CN108483894A CN201810489461.8A CN201810489461A CN108483894A CN 108483894 A CN108483894 A CN 108483894A CN 201810489461 A CN201810489461 A CN 201810489461A CN 108483894 A CN108483894 A CN 108483894A
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- China
- Prior art keywords
- stick
- stick portion
- extension
- hanging rod
- hung
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
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Classifications
-
- 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
- C03B37/02—Manufacture of glass fibres or filaments by drawing or extruding, e.g. direct drawing of molten glass from nozzles; Cooling fins therefor
- C03B37/025—Manufacture of glass fibres or filaments by drawing or extruding, e.g. direct drawing of molten glass from nozzles; Cooling fins therefor from reheated softened tubes, rods, fibres or filaments, e.g. drawing fibres from preforms
- C03B37/027—Fibres composed of different sorts of glass, e.g. glass optical fibres
- C03B37/02736—Means for supporting, rotating or feeding the tubes, rods, fibres or filaments to be drawn, e.g. fibre draw towers, preform alignment, butt-joining preforms or dummy parts during feeding
-
- 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
- C03B37/02—Manufacture of glass fibres or filaments by drawing or extruding, e.g. direct drawing of molten glass from nozzles; Cooling fins therefor
- C03B37/025—Manufacture of glass fibres or filaments by drawing or extruding, e.g. direct drawing of molten glass from nozzles; Cooling fins therefor from reheated softened tubes, rods, fibres or filaments, e.g. drawing fibres from preforms
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Manufacture, Treatment Of Glass Fibers (AREA)
Abstract
The invention discloses a kind of extension bar device, including pylon and the hanging rod platform that is arranged on pylon, the hanging rod platform for fixing preform, it is characterized in that：The pylon is equipped at least two and hangs stick portion, and the hanging rod platform at least has two be separately positioned in each extension stick portion；The pylon, which is equipped with, hangs stick station, and each hanging rod platform hung in stick portion, which can move, either to be rotated to each hanging rod platform hung in stick portion is alternately mobile on extension stick station or rotation is extremely hung on stick station.The extension bar device of the present invention, ability with caching prefabricated rods, replaces traditional extension bar device to use, may be implemented smoothly to switch prefabricated rods in the case where fiber drawing furnace does not cool down, it is entire to change the production time and foreshortened to 0.5 hour by original 3 hours, drawing optical fibers production efficiency can greatly be improved.
Description
Technical field
The invention belongs to silica fibre manufacturing technology fields, and in particular to a kind of extension bar device, further relating to a kind of use should
Hang the drawing optical fibers production system of bar device.
Background technology
With the proposition of fiber to the home and 5G concepts, optical fiber dosage is more and more, and existing market is in the shape that supply falls short of demand
State, so that yield improves by expanding production or raising speed one after another in internal optical fiber manufacturer.In addition to this, in production process
In, the production technology of optical fiber is continuously improved, device structure is optimized, improves production efficiency and a kind of effective method.
Bar device is hung for hanging up preform, it includes pylon and hanging rod platform, current extension stick to hang bar device mainly
Device configures a hanging rod platform, and optical wand wire drawing will follow the steps below successively when carrying out changing production operation：1) to fiber drawing furnace
Cool down；2) prefabricated rods are unloaded into stick after being taken out in fiber drawing furnace；3) it is packed into fiber drawing furnace after hanging up new prefabricated rods；4) wire drawing
Stove is warming up to normal wire-drawing temperature.The whole process duration is a great wave for production efficiency in 3h or so
Take.How to be become mostly to improve drawing optical fibers production efficiency by optimizing device structure (for example the structure of bar device is hung in optimization)
The current main R＆D direction of number manufacturer.
Invention content
The technical problem to be solved in the present invention is to provide a kind of extension bar devices, and there is the ability of caching prefabricated rods, substitution to pass
The extension bar device of system uses, and may be implemented smoothly to switch prefabricated rods in the case where fiber drawing furnace does not cool down, entirely change the production time by
3 hours originally foreshorten to 0.5 hour, can greatly improve drawing optical fibers production efficiency.
In order to solve the above technical problem, the present invention provides a kind of extension bar devices, including pylon and setting are on pylon
Hanging rod platform, for fixing preform, the pylon is equipped at least two and hangs stick portions, the extension hanging rod platform
Stick platform at least has two be separately positioned in each extension stick portion；The pylon, which is equipped with, hangs stick station, each extension stick portion
On hanging rod platform can move or rotate to hanging on stick station, each hanging rod platform hung in stick portion alternately moves
Or in rotation to extension stick station.
In a preferred embodiment of the present invention, further comprise setting that there are two hang stick portion, two extensions on the pylon
Stick portion is separately fixed on respective turntable, and the turntable is each attached on pylon, and the turntable drives respective extension
Stick portion rotates so that the hanging rod platform is rotated to extension stick station.
In a preferred embodiment of the present invention, further comprise setting on the pylon there are three hanging stick portion, respectively first
Hang stick portion, second hang stick portion and third hangs stick portion, the extensions stick station setting is hung first in stick portion, described second hang stick portion with
Third hangs the both sides that stick portion is separately positioned on the first extension stick portion；The hanging rod platform, which at least has, is separately positioned on the second extension stick portion
Two in stick portion are hung with third；Hanging rod platform in second extension stick portion, which can be moved to, to be hung on stick station, the third
Hanging the hanging rod platform in stick portion can be moved on extension stick station；Described second hangs the hanging rod platform in stick portion and third extension stick portion
It is alternately moved on the extension stick station.
In a preferred embodiment of the present invention, further comprise that described first hangs stick portion, the second extension stick portion and third extension stick
The line slide rail being mutually communicated is equipped in portion, what the hanging rod platform can move under the driving of power source along line slide rail
It is arranged in respective extension stick portion.
In a preferred embodiment of the present invention, further comprise that the hanging rod platform is driven to slide in the straight line for respectively hanging stick portion
The power source slided in rail is the screw mechanism of servo motor driving.
In order to solve the above-mentioned technical problem, the present invention also provides a kind of drawing optical fibers production line, including fiber drawing furnace and with
The extension bar device of upper structure, the extension stick station are arranged in the surface of fiber drawing furnace fire door, and the preform is positioned in
It is admitted in fiber drawing furnace after hanging stick station or is drawn out out of fiber drawing furnace.
In a preferred embodiment of the present invention, further comprises that the fiber drawing furnace is equipped with to be used to open or cover and close its stove
The fire resisting capping of mouth, the preform are drawn out rear cover out of fiber drawing furnace and close the fire resisting capping.
In a preferred embodiment of the present invention, further comprise that its fire door is provided with sealing gland machine on the fiber drawing furnace
Structure inputs inert gas into fiber drawing furnace by the sealing mechanism.
In a preferred embodiment of the present invention, further comprise that there are two types of operating modes for the sealing mechanism tool, respectively
Wire drawing production model and thread-changing pattern.
In a preferred embodiment of the present invention, further comprise that it further includes PLC controller, the PLC controller control
Connect sealing mechanism, turntable and servo motor.
The extension bar device of one, the present invention, at least tool have the ability of caching prefabricated rods, Neng Goutong there are two stick portion is hung
When hang up at least two prefabricated rods, one in the two prefabricated rods is in wire drawing pattern, another be in change stick pattern, with this
Prefabricated rods can be greatly shortened changes the stick time so that being carried out continuously for drawing optical fibers production is possibly realized.
Secondly, the present invention drawing optical fibers production system, use with caching prefabricated rods ability extension bar device replace pass
The extension bar device of system uses, and may be implemented smoothly to switch prefabricated rods in the case where fiber drawing furnace does not cool down, entirely change the production time by
3 hours originally foreshorten to 0.5 hour, can greatly improve drawing optical fibers production efficiency.
Description of the drawings
Fig. 1 is extension bar device structural schematic diagram in the preferred embodiment of the present invention；
Fig. 2 is the overlooking structure diagram that the first structure of bar device is hung in the preferred embodiment of the present invention；
Fig. 3 is the overlooking structure diagram that second of structure of bar device is hung in the preferred embodiment of the present invention；
Fig. 4 is the structural schematic diagram of drawing optical fibers production system in the preferred embodiment of the present invention.
Wherein：2- pylons, 4- hanging rod platforms, 5- hang stick station, 6- preforms, and 8- hangs stick portion one, and 10- hangs stick portion
Two, 12- first hangs stick portion, and 14- second hangs stick portion, and 16- thirds hang stick portion, 18- fiber drawing furnaces, 20- fire resistings capping, 22- sealing gland machines
Structure.
Specific implementation mode
The invention will be further described in the following with reference to the drawings and specific embodiments, so that those skilled in the art can be with
It more fully understands the present invention and can be practiced, but illustrated embodiment is not as a limitation of the invention.
Embodiment one
As shown in Figs. 1-2, present embodiment discloses a kind of extension bar device, including pylon 2 and hanging rod platform 4, above-mentioned extension sticks
For platform 4 for fixing preform 6, above-mentioned pylon 2, which is equipped with, hangs stick station 5, is set on above-mentioned pylon 2 there are two extension stick portion,
It respectively hangs stick portion 1 and hangs stick portion 2 10, hang stick portion 1 and hang the both sides that stick portion 2 10 is separately positioned on extension stick station 5, on
Stating hanging rod platform 4 has at least two for being separately positioned on and hanging in stick portion 1 and extension stick portion 2 10, two above-mentioned extension stick portions difference
It is fixed on respective turntable, above-mentioned turntable is each attached on pylon 2, and above-mentioned turntable drives respective extension stick portion to turn
It is dynamic so that in the rotation of above-mentioned hanging rod platform 4 to extension stick station.Two turntable self contained functions so that two extensions hung in stick portion
Stick platform 4 is alternately in rotation to extension stick station 5.
The ability of the above structure hung bar device and have caching prefabricated rods, replaces traditional extension bar device use to be drawn in optical fiber
When on silk production line, currently just hung up on being located in the hanging rod platform 4 hung on stick station 5 in the prefabricated rods of wire drawing 6, in drawing
Silk pattern；And another hanging rod platform 4 hung in stick portion carries out filling stick again again after unloading stick, into changing stick pattern.Two prefabricated
Stick alternately enters wire drawing pattern and changes stick pattern, and can greatly shorten prefabricated rods changes the stick time.
As shown in Figs. 1-3, second of above-mentioned extension bar device realizes that structure is as follows：Stick is hung there are three being set on above-mentioned pylon 2
Portion, respectively first, which hangs stick portion 12, second, hangs stick portion 14 and third extension stick portion 16, and the above-mentioned setting of extension stick station 5 hangs stick first
In portion 12, above-mentioned second extension stick portion 14 and third hang the both sides that stick portion 16 is separately positioned on the first extension stick portion 12；Above-mentioned extension stick is flat
At least there is platform 4 the second extension stick portion 14 that is separately positioned on and third to hang two in stick portion 16；Above-mentioned second hangs in stick portion 14
Hanging rod platform 4, which can be moved to, to be hung on stick station 5, and above-mentioned third, which hangs the hanging rod platform 4 in stick portion 16, can be moved to extension stick work
On position 5；The hanging rod platform 4 that above-mentioned second extension stick portion 14 and third are hung in stick portion 16 is alternately moved on above-mentioned extension stick station 5.
Specifically, above-mentioned first extension stick portion 12, second hangs stick portion 14 and third hangs and is equipped with the line slide rail being mutually communicated in stick portion 16,
What above-mentioned hanging rod platform 4 can move under driving of the screw mechanism driven using servo motor as power source along line slide rail sets
It sets in respective extension stick portion.
More than, change the position of hanging rod platform using the mode of rotation in the first structure, using moving in structure in second
Dynamic mode changes the position of hanging rod platform, and can realize prefabricated rods smoothly changes stick, changes rod motion with the first structure, this
Place repeats no more.
Embodiment two
As shown in figure 4, present embodiment discloses a kind of drawing optical fibers production system, including fiber drawing furnace 18, the above structure
It hangs bar device and PLC controller, above-mentioned extension stick station 5 is arranged in the surface of 18 fire door of fiber drawing furnace, 6 quilt of above-mentioned preform
It is located in and is admitted in fiber drawing furnace 18 after hanging stick station 5 or is drawn out out of fiber drawing furnace 18.Above-mentioned fiber drawing furnace 18, which is equipped with, to be used
In opening or lid closes the fire resisting capping 20 of its fire door, above-mentioned preform 6, which is drawn out rear cover out of fiber drawing furnace 18 and closes, to be stated
Fire resisting capping 20.Its fire door is provided with sealing mechanism 22 on above-mentioned fiber drawing furnace 18, by above-mentioned sealing mechanism 22 to wire drawing
Inert gas is inputted in stove 18.There are two types of operating modes, respectively wire drawing production model and thread-changing mould for the tool of above-mentioned sealing mechanism 22
Formula.Above-mentioned PLC controller control connection sealing mechanism 22, turntable and servo motor.
The drawing optical fibers production system of the above structure, thread-changing, production process are as follows：
When the normal wire drawing of optical fiber：It hangs up and is being positioned in 6 quilt of preform hung on the hanging rod platform 4 on stick station 5
It is sent into fiber drawing furnace 18, carries out normal drawing optical fibers operation, sealing mechanism 22 enters life under the control of PLC controller at this time
Production pattern inputs inert gas into the fiber drawing furnace 18 in production model, it is ensured that the normal of drawing optical fibers is smoothed out.
When 6 wire drawing of current optical fiber prefabricated rods terminates to need thread-changing：Sealing mechanism 22 enters thread-changing pattern in advance, to fiber drawing furnace
Inert gas (argon gas) under interior input thread-changing pattern, the difference of the inert gas of thread-changing pattern and the inert gas of production model
It is only that the input quantity of inert gas, the inert gas input quantity of thread-changing pattern are more than the inert gas input quantity of production model；
Preform 6 is pulled out out of fiber drawing furnace then, lid conjunction fire resisting capping 20 rapidly after preform is pulled out, by fiber drawing furnace 18
Furnace inner environment is isolated from the outside world, and lid, which closes fire resisting capping 20, can avoid the fire door of fiber drawing furnace 18 from aoxidizing, and plays protection fiber drawing furnace
Effect.The preform of production model, which is moved or be rotated into leave, hangs stick station 5, and changes the optical fiber prefabricating of stick pattern
Stick, which is moved or is rotated into, hangs stick station 5, is then again turned on fire resisting capping 20, will change the preform after stick and is sent into
In fiber drawing furnace 18, a thread-changing is completed.
In addition, before fire resisting capping 20 is opened every time, sealing mechanism 22 all enters thread-changing pattern in advance, it is ensured that thread-changing is smoothed out
While, it plays a protective role to fiber drawing furnace 18.
It, can be with using having the extension bar device of caching prefabricated rods ability that traditional extension bar device is being replaced to use based on this
Realization smoothly switches prefabricated rods in the case where fiber drawing furnace does not cool down, and entirely changing the production time, by original 3 hours to foreshorten to 0.5 small
When, drawing optical fibers production efficiency can greatly be improved.
Embodiment described above is only to absolutely prove preferred embodiment that is of the invention and being lifted, protection model of the invention
It encloses without being limited thereto.Those skilled in the art on the basis of the present invention made by equivalent substitute or transformation, in the present invention
Protection domain within.Protection scope of the present invention is subject to claims.
Claims (10)
1. a kind of extension bar device, including pylon and the hanging rod platform being arranged on pylon, the hanging rod platform is for fixing optical fiber
Prefabricated rods, it is characterized in that：The pylon is equipped at least two and hangs stick portion, and the hanging rod platform, which at least has, to be respectively set
Two in each extension stick portion；The pylon, which is equipped with, hangs stick station, and each hanging rod platform hung in stick portion can move
Either each hanging rod platform hung in stick portion is alternately mobile in rotation to extension stick station or rotation is extremely hung on stick station.
2. hanging bar device as described in claim 1, it is characterised in that：Stick portion is hung there are two being set on the pylon, described in two
It hangs stick portion to be separately fixed on respective turntable, the turntable is each attached on pylon, and the turntable driving is respective
Hang the rotation of stick portion so that the hanging rod platform is rotated to extension stick station.
3. hanging bar device as described in claim 1, it is characterised in that：It is set on the pylon there are three stick portion is hung, respectively the
One, which hangs stick portion, the second extension stick portion and third, hangs stick portion, and the extension stick station setting is hung first in stick portion, and described second hangs stick portion
The both sides that stick portion is separately positioned on the first extension stick portion are hung with third；The hanging rod platform, which at least has, is separately positioned on the second extension stick
Portion and third hang two in stick portion；Hanging rod platform in second extension stick portion, which can be moved to, to be hung on stick station, and described the
Hanging rod platform in three extension stick portions, which can be moved to, to be hung on stick station；The described second extension stick hung in stick portion and third extension stick portion is put down
Platform is alternately moved on the extension stick station.
4. hanging bar device as claimed in claim 3, it is characterised in that：Described first, which hangs stick portion, the second extension stick portion and third, hangs
The line slide rail being mutually communicated is equipped in stick portion, the hanging rod platform can move under the driving of power source along line slide rail
Setting in respective extension stick portion.
5. hanging bar device as claimed in claim 4, it is characterised in that：Drive the hanging rod platform in the straight line for respectively hanging stick portion
The power source slided in sliding rail is the screw mechanism of servo motor driving.
6. a kind of drawing optical fibers production line, including fiber drawing furnace, it is characterised in that：Further include as described in claim any one of 1-5
Extension bar device, the extension stick station is arranged in the surface of fiber drawing furnace fire door, and the preform, which is positioned in, hangs stick work
It is admitted to behind position in fiber drawing furnace or is drawn out out of fiber drawing furnace.
7. drawing optical fibers production line as claimed in claim 6, it is characterised in that：The fiber drawing furnace be equipped be used to open or
Lid closes the fire resisting capping of its fire door, and the preform is drawn out rear cover out of fiber drawing furnace and closes the fire resisting capping.
8. drawing optical fibers production line as claimed in claim 6, it is characterised in that：It is provided with close to its fire door on the fiber drawing furnace
Sealing mechanism inputs inert gas into fiber drawing furnace by the sealing mechanism.
9. drawing optical fibers production line as claimed in claim 8, it is characterised in that：There are two types of Working moulds for the sealing mechanism tool
Formula, respectively wire drawing production model and thread-changing pattern.
10. drawing optical fibers production line as claimed in claim 8, it is characterised in that：It further includes PLC controller, the PLC controls
Device control connection sealing mechanism, turntable and servo motor processed.
Priority Applications (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810489461.8A CN108483894B (en) | 2018-05-21 | 2018-05-21 | Rod hanging device and optical fiber drawing production system |
| PCT/CN2018/115143 WO2019223255A1 (en) | 2018-05-21 | 2018-11-13 | Rod hanging apparatus and optical fiber drawing system |
| DE112018007645.8T DE112018007645T5 (en) | 2018-05-21 | 2018-11-13 | Rod hanger and system for pulling glass fibers |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810489461.8A CN108483894B (en) | 2018-05-21 | 2018-05-21 | Rod hanging device and optical fiber drawing production system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN108483894A true CN108483894A (en) | 2018-09-04 |
| CN108483894B CN108483894B (en) | 2020-04-10 |
Family
ID=63353537
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810489461.8A Active CN108483894B (en) | 2018-05-21 | 2018-05-21 | Rod hanging device and optical fiber drawing production system |
Country Status (3)
| Country | Link |
|---|---|
| CN (1) | CN108483894B (en) |
| DE (1) | DE112018007645T5 (en) |
| WO (1) | WO2019223255A1 (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109485251A (en) * | 2018-12-13 | 2019-03-19 | 中天科技光纤有限公司 | A kind of preform is from moving stick movement system |
| WO2019223255A1 (en) * | 2018-05-21 | 2019-11-28 | 江苏亨通光纤科技有限公司 | Rod hanging apparatus and optical fiber drawing system |
| CN113754271A (en) * | 2021-09-01 | 2021-12-07 | 富通集团（嘉善）通信技术有限公司 | Optical fiber drawing apparatus |
| CN116217070A (en) * | 2023-03-02 | 2023-06-06 | 安徽长荣光纤光缆科技有限公司 | Optical fiber drawing production process |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112830670A (en) * | 2021-01-21 | 2021-05-25 | 陈富伦 | Quartz glass tube rod production furnace and quartz glass tube rod production method |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS57191245A (en) * | 1981-05-22 | 1982-11-25 | Nippon Glass Seni Kk | Bushing |
| CN202849257U (en) * | 2012-08-27 | 2013-04-03 | 浙江富通光纤技术有限公司 | Rod suspension rack of fiber prefabricated rod |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001151526A (en) * | 1999-11-26 | 2001-06-05 | Nippon Sheet Glass Co Ltd | Hanging device for glass material |
| CN108483894B (en) * | 2018-05-21 | 2020-04-10 | 江苏亨通光纤科技有限公司 | Rod hanging device and optical fiber drawing production system |
-
2018
- 2018-05-21 CN CN201810489461.8A patent/CN108483894B/en active Active
- 2018-11-13 DE DE112018007645.8T patent/DE112018007645T5/en active Pending
- 2018-11-13 WO PCT/CN2018/115143 patent/WO2019223255A1/en active Application Filing
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS57191245A (en) * | 1981-05-22 | 1982-11-25 | Nippon Glass Seni Kk | Bushing |
| CN202849257U (en) * | 2012-08-27 | 2013-04-03 | 浙江富通光纤技术有限公司 | Rod suspension rack of fiber prefabricated rod |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2019223255A1 (en) * | 2018-05-21 | 2019-11-28 | 江苏亨通光纤科技有限公司 | Rod hanging apparatus and optical fiber drawing system |
| CN109485251A (en) * | 2018-12-13 | 2019-03-19 | 中天科技光纤有限公司 | A kind of preform is from moving stick movement system |
| CN109485251B (en) * | 2018-12-13 | 2023-10-13 | 中天科技光纤有限公司 | Automatic rod changing operation system for optical fiber preform |
| CN113754271A (en) * | 2021-09-01 | 2021-12-07 | 富通集团（嘉善）通信技术有限公司 | Optical fiber drawing apparatus |
| CN116217070A (en) * | 2023-03-02 | 2023-06-06 | 安徽长荣光纤光缆科技有限公司 | Optical fiber drawing production process |
Also Published As
| Publication number | Publication date |
|---|---|
| CN108483894B (en) | 2020-04-10 |
| DE112018007645T5 (en) | 2021-03-18 |
| WO2019223255A1 (en) | 2019-11-28 |
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