CN103803789A - Method and device for prefabricated bar head-shaped deposition - Google Patents
Method and device for prefabricated bar head-shaped deposition Download PDFInfo
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- CN103803789A CN103803789A CN201210438256.1A CN201210438256A CN103803789A CN 103803789 A CN103803789 A CN 103803789A CN 201210438256 A CN201210438256 A CN 201210438256A CN 103803789 A CN103803789 A CN 103803789A
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- sintering
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P40/00—Technologies relating to the processing of minerals
- Y02P40/50—Glass production, e.g. reusing waste heat during processing or shaping
- Y02P40/57—Improving the yield, e-g- reduction of reject rates
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Abstract
The invention discloses a method and a device for prefabricated bar head-shaped deposition. A core bar rotates around the own axis at a constant speed, a raw material blowlamp located below the core bar performs reciprocating motion along the axial direction of the core bar, and the moving amplitude is gradually decreased from a preset maximum value to a preset minimum value; the raw material blowlamp ejects a raw material, the raw material forms conical surfaces respectively at two ends of the core bar, and thus the conical surfaces are formed at the two ends of the core bar, and the head part conical surfaces are not required to be subjected to flame slitting or mechanical processing, so that after the prefabricated bar size is allowed to be increased, production costs are reduced, the technological process is decreased, the production efficiency of optical fiber prefabricated bars is greatly improved.
Description
Technical field
The present invention relates to optical communication field, relate in particular to a kind of method and device of prefabricated rods capitiform deposition.
Background technology
Along with the arrival of information age, the competition of optical fiber industry grows in intensity, and the price of preform, optical fiber and optical cable is kept falling, and Cost Competition becomes the primary factor of the sector market competition gradually.
At present, the surrounding layer technique of manufacturing preform, what be most widely used is vapour phase axial deposition technique (VAD) and outer vapour deposition process (OVD), these two kinds of methods all belong to the outer method of pipe, be applicable to manufacturing large-sized preform, there is the advantage that production efficiency is high, cost is low.But along with the increase of prefabricated rods outside dimension, the mode of the fixing taillight torch firing of two ends heating taillight makes the conical surface produce burning trace and irregular, the conical surface need to be excised to processing, the wire drawing head of cutting formation with flame is processed, its difficulty increases and cuts length consuming time, hydrogen or oxygen gas consumption is large, and cost is high.
Therefore how to solve after the increase of optical fiber prefabricating rod outside diameter, the high and low efficiency of cost ground makes wire drawing head, makes the key of prefabricated rods to large size development by becoming the outer legal system of pipe.
Summary of the invention
In view of this, the invention provides method and the device of a kind of prefabricated rods capitiform deposition, to solve in prior art after optical fiber prefabricating rod outside diameter increases, make the high and low efficiency of wire drawing head cost ground problem, its concrete scheme is as follows:
A method for prefabricated rods capitiform deposition, is applied to the manufacture of preform, comprising:
Plug is around Pivot Point Center uniform rotation;
The raw material blowtorch that is positioned at described plug below moves back and forth along described plug axis direction, and mobile range is decreased to default minimum value gradually by the maximum value of presetting;
Described raw material blowtorch ejection raw material, forms the conical surface at described plug two ends.
Also comprise: the described conical surface is carried out to sintering.
Described sintering process comprises: by sintering taillight to described conical surface jet flames, and described sintering taillight spray flame direction vertical with the described conical surface, the described conical surface is carried out to sintering.
The flame heat regulating that described sintering taillight produces distributes and jet length staged reduces.
Described raw material blowtorch is fixed on mobile platform, moves with mobile platform.
Described sintering taillight is fixed on described mobile platform, makes described sintering taillight and described raw material blowtorch synchronizing moving.
The vertical projection length ratio on the flame spraying coverage of described sintering taillight and described loose media inclined-plane is 2:3.
Described sintering taillight provides hydrogen, oxygen, and wherein hydrogen flowing quantity funtcional relationship is:
In the time that deposition shift position instant value is between skew starting point and inclined-plane minimum outer diameter, described hydrogen flowing quantity is the first flow set(ting)value that structure taillight is displaced to conical surface outside;
In the time that deposition shift position instant value is between inclined-plane minimum outer diameter and inclined-plane maximum outside diameter, described hydrogen flowing quantity is the curvilinear motion coefficient of benchmark hydrogen flow and hydrogen flow and deposits the poor of shift position instant value product;
In the time that deposition shift position instant value is between inclined-plane maximum outside diameter and skew terminating point, described hydrogen flowing quantity is the second flow setting value that structure taillight is displaced to conical surface outside.
A device for prefabricated rods capitiform deposition, comprising:
Around the plug of Pivot Point Center uniform rotation;
Be positioned at described plug below, move back and forth along described plug axis direction, and mobile range is decreased to default minimum value gradually by the maximum value of presetting, and spray raw material to described plug, form the raw material blowtorch of the conical surface at described plug two ends.
The described conical surface is carried out to the sintering taillight of sintering.
Described sintering taillight comprises:
Make the inclined-plane that flame heat regulating distributes and jet length reduces along bevel direction staged spraying.
Also comprise: for fixing described raw material blowtorch and sintering taillight, the mobile platform that described sintering taillight and raw material blowtorch are moved back and forth along described plug axis direction.
Can find out from technique scheme, in the method for making prefabricated rods disclosed by the invention and device, raw material blowtorch moves back and forth along plug axis direction, and mobile range is decreased to default minimum value gradually by the maximum value of presetting, thereby form the conical surface at plug two ends, without the head conical surface is carried out, flame is cut or machining, and then after prefabricated rods size is increased, reduce production costs, reduce technical process, improved greatly the production efficiency of preform.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, to the accompanying drawing of required use in embodiment or description of the Prior Art be briefly described below, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skills, do not paying under the prerequisite of creative work, can also obtain according to these accompanying drawings other accompanying drawing.
Fig. 1 is the basic flow sheet of the method for the disclosed a kind of prefabricated rods capitiform deposition of the embodiment of the present invention;
Fig. 2 is the basic flow sheet of the method for the disclosed a kind of prefabricated rods capitiform deposition of the embodiment of the present invention;
Fig. 3 is the structural representation of the device of the disclosed a kind of prefabricated rods capitiform deposition of the embodiment of the present invention;
Fig. 4 is the sintering tail lamp structure schematic diagram in the device of the disclosed a kind of prefabricated rods capitiform deposition of the embodiment of the present invention.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is clearly and completely described, obviously, described embodiment is only the present invention's part embodiment, rather than whole embodiment.Based on the embodiment in the present invention, those of ordinary skills, not making the every other embodiment obtaining under creative work prerequisite, belong to the scope of protection of the invention.
The basic flow sheet of the method for a kind of prefabricated rods capitiform deposition disclosed by the invention as shown in Figure 1, comprising:
Step S11, plug are around Pivot Point Center uniform rotation;
Described plug is fixed on rolling clamp by drawing rod and tail rod, described in draw rod and tail rod consistent with the external diameter of described plug, when excellent and tail rod is drawn in rolling clamp drive around Pivot Point Center uniform rotation, drive described plug around Pivot Point Center uniform rotation.
Step S12, the raw material blowtorch that is positioned at described plug below move back and forth along described plug axis direction, and mobile range is decreased to default minimum value gradually by the maximum value of presetting.
The mobile range of described raw material blowtorch is relevant with the spray regime of described raw material blowtorch, if described loose media the longest be L, described loose media is the shortest is l, the radius of described raw material blowtorch spray regime is r.When the mobile range of described raw material blowtorch is default maximum value, the path of described raw material blowtorch spray regime is L/2-r, and when the mobile range of described raw material blowtorch is default minimum value, the path of described raw material blowtorch spray regime is l/2-r.
It should be noted that, because described raw material blowtorch is to move back and forth along plug axis direction, the central point moving back and forth take described raw material blowtorch is as initial point, the amplitude of described raw material blowtorch is the mobile range of described raw material blowtorch, accordingly, the amplitude at described raw material blowtorch spray regime center is the path of described raw material blowtorch spray regime.
Step S13, described raw material blowtorch ejection raw material, form the conical surface at described plug two ends.
Described raw material blowtorch is arranged under described plug, and raw material blowtorch moves back and forth along described plug axis direction, makes the raw material of described raw material blowtorch ejection on described plug, form the loose media of even density.Because described plug is around Pivot Point Center uniform rotation, so the loose media that the raw material of described raw material blowtorch ejection forms on described plug is right cylinder.The mobile range of described raw material blowtorch is decreased to default minimum value gradually by the maximum value of presetting, and makes the raw material of raw material blowtorch ejection form the conical surface at the two ends of described plug.
Further, described raw material blowtorch is fixed on mobile platform, moves with the movement of described mobile platform.
The method of the disclosed a kind of prefabricated rods capitiform deposition of the embodiment of the present invention, move back and forth along plug axis direction by raw material blowtorch, and mobile range is decreased to default minimum value gradually by the maximum value of presetting, thereby form the conical surface at plug two ends, without the head conical surface is carried out, flame is cut or machining, thereby after prefabricated rods size is increased, reduce production costs, reduce technical process, improved greatly the production efficiency of preform.
The basic flow sheet of the method for a kind of prefabricated rods capitiform deposition disclosed by the invention as shown in Figure 2, comprising:
Step S21, plug are around Pivot Point Center uniform rotation;
Step S22, the raw material blowtorch that is positioned at described plug below move back and forth along described plug axis direction, and mobile range is decreased to default minimum value gradually by the maximum value of presetting;
Step S23, described raw material blowtorch ejection raw material, form the conical surface at described plug two ends;
Step S24, the described conical surface is carried out to sintering.
The described conical surface is carried out to sintering, to burn the conical surface at real loose media two ends, strengthen the density of the loose media two ends conical surfaces, make the conical surface of described loose media smooth, ripple does not cave in simultaneously.
Described sintering process comprises: by least two sintering taillights to described conical surface jet flames, and described sintering taillight spray flame direction vertical with the described conical surface, the described conical surface is carried out to sintering.
Further, the flame heat regulating that described sintering taillight produces distributes and jet length staged reduces.The flame spraying mouth of described sintering taillight is inclined-plane, and described inclined-plane is parallel with the conical surface at the loose media two ends that the raw material of described raw material blowtorch ejection forms, and makes the density of the loose media two ends conical surface different positions after sintering basically identical.
Further, described sintering taillight is fixed on described mobile platform, make described sintering taillight and described raw material blowtorch synchronizing moving, reaching the described sintering taillight sintering loose media two ends conical surface when, sintering loose media is except the rest part of the conical surface, make the whole loose media forming on described plug can both realize the real dehydration of burning, density increases.
Further, in the time that described sintering taillight is fixed on described mobile platform, the flame spraying coverage of described sintering taillight and the vertical projection length ratio of the described loose media conical surface are about 2:3, the ratio that is the spray regime of flame and the peak excursion value of raw material blowtorch is about 2:3, wherein, the flame spraying coverage of described sintering taillight refers to the scope of the described loose media two ends conical surface that flame energy torch firing is heated to, be described sintering taillight while maintaining static, the scope of the conical surface that its flame can be ejected into.Now, the conical surface length overlapping 2/3rds of the raw material formation of deposits of the flame spraying scope of described sintering taillight and the ejection of adjacent raw material blowtorch, can make the conical surface density that described loose media two ends form burn in fact, be difficult for producing depression, thereby form the smooth smooth conical surface.
The method of the disclosed a kind of prefabricated rods capitiform deposition of the present embodiment, carry out the process of sintering by increasing the conical surface that plug two ends are formed, make that the conical surface is smooth, the ripple that do not cave in, and then make formed prefabricated rods not need head processing, just directly wire drawing.
In the above-described embodiments, described sintering taillight, by spraying hydrogen and oxygen, to burn real loose loose media, strengthens the density of the described loose media conical surface.Described sintering taillight O/H ratio control is between 0.3-0.4, wherein take 0.34 as best.By temperature measurer, the flame of different flow is tested to the data that obtain as shown in the table.
Visible, described sintering taillight O/H ratio control is between 0.3-0.4 time, and the flame temperature that described sintering taillight ejects is higher, is especially 0.34 o'clock in O/H ratio, and the flame temperature that described sintering taillight ejects is the highest.So described sintering taillight O/H ratio control, between 0.3-0.4, is preferably 0.34, to obtain higher sintering temperature, reaches better sintering effect.
In addition, along with the change of the deposition position of the raw material of described raw material blowtorch ejection, the shape of the deposition position of described raw material also can change, accordingly, its required sintering temperature also can change, therefore,, in order to reach best sintering effect, the hydrogen-oxygen flow of described sintering taillight changes with certain functional form.The functional relation of described sintering taillight hydrogen flowing quantity is as follows:
Concrete, in the time that deposition shift position instant value is between skew starting point and inclined-plane minimum outer diameter, described hydrogen flowing quantity is the first flow set(ting)value that structure taillight is displaced to conical surface outside, that is:
y=a (d＜x＜d1）
Wherein, a is the flow setting value that structure taillight is displaced to conical surface outside, is normal number, and x is deposition shift position instant value, and d is for being offset starting point, and d1 is conical surface minimum outer diameter place.
In the time that deposition shift position instant value is between inclined-plane minimum outer diameter and inclined-plane maximum outside diameter, described hydrogen flowing quantity be benchmark hydrogen flow and hydrogen flow curvilinear motion coefficient with deposit the poor of shift position instant value product, that is:
y=b-cx(d1≤x≤d2)
Wherein, b is benchmark hydrogen flow, is normal number, and c is the curvilinear motion coefficient of hydrogen flow, is normal number, and x is deposition shift position instant value, and d1 is conical surface minimum outer diameter place, and d2 is maximum outside diameter place, inclined-plane.
In the time that deposition shift position instant value is between inclined-plane maximum outside diameter and skew terminating point, described hydrogen flowing quantity is the second flow setting value that structure taillight is displaced to conical surface outside, that is:
y=k (d2＜x＜D)
Wherein, k is the flow setting value that structure taillight is displaced to conical surface outside, is normal number, and x is deposition shift position instant value, and d2 is maximum outside diameter place, inclined-plane, and D is skew terminating point.
The hydrogen-oxygen ratio that the disclosed sintering taillight of the present embodiment sprays is between 0.3-0.4, and along with the change of the deposition position of the raw material of described raw material blowtorch ejection, hydrogen-oxygen flow changes with certain functional form, now flame temperature is higher, hydrogen-oxygen utilization ratio can be effectively improved, and best sintering effect can be reached.
The device of the disclosed a kind of prefabricated rods capitiform deposition of the embodiment of the present invention, its structural representation as shown in Figure 3, comprising:
Wherein, described plug 31 is around Pivot Point Center uniform rotation, described raw material blowtorch 32 is positioned at described plug 31 belows, move back and forth along described plug 31 axis directions, make raw material that described raw material blowtorch 32 sprays on described plug 31, form the loose media of even density, because described plug 31 is around Pivot Point Center uniform rotation, so the loose media that the raw material that described raw material blowtorch 32 sprays forms on described plug 31 is right cylinder.The mobile range of described raw material blowtorch 32 is decreased to default minimum value gradually by the maximum value of presetting in addition, and sprays raw material to described plug 31, makes the raw material that raw material blowtorch 32 sprays form the conical surface at described plug 31 two ends.
Further, the device of described prefabricated rods capitiform deposition also comprises: sintering taillight 33.
The conical surface that described sintering taillight 33 forms described plug 31 two ends carries out sintering.
Further, the device of described prefabricated rods capitiform deposition also comprises: mobile platform 34.
Described raw material blowtorch 32 is arranged on described mobile platform 34, and described raw material blowtorch 32 moves with the movement of described mobile platform 34.
Further, the device of described prefabricated rods capitiform deposition also comprises: rolling clamp 35, draws rod 36, tail rod 37.
Described plug 31 draws rod 36 and described tail rod 37 is fixed on described rolling clamp 35 by described, described in to draw rod 36 consistent with the external diameter of described plug 31 with tail rod 37.When drawing rod 36 and tail rod 37 around Pivot Point Center uniform rotation described in described rolling clamp 35 drives, drive described plug 31 around Pivot Point Center uniform rotation.
The device of the disclosed prefabricated rods capitiform deposition of the present embodiment, move back and forth along plug axis direction by raw material blowtorch, and mobile range is decreased to default minimum value gradually by the maximum value of presetting, thereby form the conical surface at plug two ends, without the head conical surface is carried out, flame is cut or machining, thereby after prefabricated rods size is increased, reduce production costs, reduce technical process, improved greatly the production efficiency of preform.
Sintering tail lamp structure schematic diagram in the device of a kind of prefabricated rods capitiform deposition disclosed by the invention as shown in Figure 4, comprising:
Sintering taillight flame ejiction opening 41.
Described sintering taillight flame ejiction opening 41 is an inclined-plane, and flame heat regulating distribution and the jet length of spraying are reduced along bevel direction staged, keeps the flame profile and the loose media conical surface keeping parallelism that spray.Along with the change of the deposition position of the raw material of described raw material blowtorch ejection, the hydrogen-oxygen flow of described sintering taillight changes with certain functional form, to keep the surface temperature of the described loose media conical surface constant.
Further, described sintering taillight is fixed on described mobile platform, raw material blowtorch on described sintering taillight and described mobile platform is moved back and forth along described plug axis direction, reaching the described sintering taillight sintering loose media conical surface when, the rest part of sintering loose media except the conical surface, make the whole loose media forming on described plug can both realize the real dehydration of burning, density increases.
Sintering taillight in the device of the disclosed prefabricated rods capitiform deposition of the present embodiment, by the improvement to sintering taillight flame spraying mouth, change sintering taillight flame spraying mouth into inclined-plane by plane, make the heat distribution of flame that sintering taillight sprays and the jet length changing conditions along inclined-plane, and then guaranteed that loose media conical surface shrinking percentage in the time of vitrifying sintering is consistent.
In this specification sheets, each embodiment adopts the mode of going forward one by one to describe, and what each embodiment stressed is and the difference of other embodiment, between each embodiment identical similar part mutually referring to.For the disclosed device of embodiment, because it corresponds to the method disclosed in Example, so description is fairly simple, relevant part illustrates referring to method part.
To the above-mentioned explanation of the disclosed embodiments, make professional and technical personnel in the field can realize or use the present invention.To be apparent for those skilled in the art to the multiple modification of these embodiment, General Principle as defined herein can, in the situation that not departing from the spirit or scope of the present invention, realize in other embodiments.Therefore, the present invention will can not be restricted to these embodiment shown in this article, but will meet the widest scope consistent with principle disclosed herein and features of novelty.
Claims (10)
1. a method for prefabricated rods capitiform deposition, is applied to the manufacture of preform, it is characterized in that,
Plug is around Pivot Point Center uniform rotation;
The raw material blowtorch that is positioned at described plug below moves back and forth along described plug axis direction, and mobile range is decreased to default minimum value gradually by the maximum value of presetting;
Described raw material blowtorch ejection raw material, forms the conical surface at described plug two ends.
2. method according to claim 1, is characterized in that, also comprises: the described conical surface is carried out to sintering, and described sintering process comprises:
By sintering taillight to described conical surface jet flames, and described sintering taillight spray flame direction vertical with the described conical surface, the described conical surface is carried out to sintering.
3. method according to claim 2, is characterized in that, the flame heat regulating that described sintering taillight produces distributes and jet length staged reduces.
4. method according to claim 2, is characterized in that, described raw material blowtorch is fixed on mobile platform, moves with mobile platform.
5. method according to claim 4, is characterized in that, described sintering taillight is fixed on described mobile platform, makes described sintering taillight and described raw material blowtorch synchronizing moving.
6. method according to claim 5, is characterized in that, the flame spraying coverage of described sintering taillight and the vertical projection length ratio of the described loose media conical surface are: 2:3.
7. method according to claim 4, is characterized in that, described sintering taillight provides hydrogen, oxygen, and wherein hydrogen flowing quantity funtcional relationship is:
In the time that deposition shift position instant value is between skew starting point and inclined-plane minimum outer diameter, described hydrogen flowing quantity is the first flow set(ting)value that structure taillight is displaced to conical surface outside;
In the time that deposition shift position instant value is between inclined-plane minimum outer diameter and inclined-plane maximum outside diameter, described hydrogen flowing quantity is the curvilinear motion coefficient of benchmark hydrogen flow and hydrogen flow and deposits the poor of shift position instant value product;
In the time that deposition shift position instant value is between inclined-plane maximum outside diameter and skew terminating point, described hydrogen flowing quantity is the second flow setting value that structure taillight is displaced to conical surface outside.
8. a device for prefabricated rods capitiform deposition, is characterized in that, comprising:
Around the plug of Pivot Point Center uniform rotation;
Be positioned at described plug below, move back and forth along described plug axis direction, and mobile range is decreased to default minimum value gradually by the maximum value of presetting, and spray raw material to described plug, form the raw material blowtorch of the conical surface at described plug two ends.
9. method according to claim 8, is characterized in that, the described conical surface is carried out to the sintering taillight of sintering, and described sintering taillight comprises:
Make the inclined-plane that flame heat regulating distributes and jet length reduces along bevel direction staged spraying.
10. device according to claim 9, is characterized in that, also comprises: for fixing described raw material blowtorch and sintering taillight, the mobile platform that described sintering taillight and raw material blowtorch are moved back and forth along described plug axis direction.
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| CN201210438256.1A CN103803789B (en) | 2012-11-06 | 2012-11-06 | A kind of method and device of prefabricated rods capitiform deposition |
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| CN201210438256.1A CN103803789B (en) | 2012-11-06 | 2012-11-06 | A kind of method and device of prefabricated rods capitiform deposition |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110461783A (en) * | 2017-03-30 | 2019-11-15 | 古河电气工业株式会社 | The manufacturing device and manufacturing method of optical fiber porous preform |
| CN110845134A (en) * | 2019-12-20 | 2020-02-28 | 青海中利光纤技术有限公司 | Prefabricated deposition device of many blowtorch optic fibre |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN1483687A (en) * | 2003-07-25 | 2004-03-24 | 杭州富通昭和光通信股份有限公司 | Method for mfg outside diameter variation reduced optical fibre prefabricated bar |
| CN1596226A (en) * | 2002-08-12 | 2005-03-16 | Lg电线株式会社 | Method and apparatus for manufacturing optical fiber preforms using the outside vapor deposition process |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN1596226A (en) * | 2002-08-12 | 2005-03-16 | Lg电线株式会社 | Method and apparatus for manufacturing optical fiber preforms using the outside vapor deposition process |
| CN1483687A (en) * | 2003-07-25 | 2004-03-24 | 杭州富通昭和光通信股份有限公司 | Method for mfg outside diameter variation reduced optical fibre prefabricated bar |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110461783A (en) * | 2017-03-30 | 2019-11-15 | 古河电气工业株式会社 | The manufacturing device and manufacturing method of optical fiber porous preform |
| CN110461783B (en) * | 2017-03-30 | 2022-09-02 | 古河电气工业株式会社 | Apparatus and method for manufacturing porous optical fiber base material |
| US11820691B2 (en) | 2017-03-30 | 2023-11-21 | Furukawa Electric Co., Ltd. | Manufacturing apparatus and manufacturing method for optical fiber porous preform |
| CN110845134A (en) * | 2019-12-20 | 2020-02-28 | 青海中利光纤技术有限公司 | Prefabricated deposition device of many blowtorch optic fibre |
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| CN103803789B (en) | 2016-12-21 |
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Effective date of registration: 20191216 Address after: Hangzhou City, Zhejiang Province, 311422 Silver Lake Science and technology of Fuyang Creative Industry Park of Fuyang Economic Development Zone Co-patentee after: Hangzhou Futong Communication Technology Co., Ltd. Patentee after: Zhejiang Futong Optical Fiber Technology Co., Ltd. Address before: Hangzhou City, Zhejiang province 311422 Fuyang City Economic Development Zone of Fuyang Lake Science and Technology Innovation Park Patentee before: Zhejiang Futong Optical Fiber Technology Co., Ltd. |