CN207987042U - A kind of device of protection OVD drive lead screws - Google Patents
A kind of device of protection OVD drive lead screws Download PDFInfo
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- CN207987042U CN207987042U CN201721884763.2U CN201721884763U CN207987042U CN 207987042 U CN207987042 U CN 207987042U CN 201721884763 U CN201721884763 U CN 201721884763U CN 207987042 U CN207987042 U CN 207987042U
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- lead screw
- blowtorch
- protective cover
- ovd
- protection
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Abstract
The utility model creates the device for providing a kind of protection OVD drive lead screws, including the blowtorch platform being slidably mounted on guide rail, and several blowtorch are equipped on the blowtorch platform；The drive lead screw of corresponding blowtorch platform is provided with lead screw protective cover, and the lead screw protective cover is equipped with several ventholes, and nitrogen has been passed through in lead screw protective cover, internal to form positive pressure cavity；The temperature sensor and pressure sensor that flow is passed through for controlling nitrogen are equipped in the lead screw protective cover.The levelness of lead screw is optimized in the utility model creation, and loosening body outer diameter is more uniform.It reduces and is scrapped caused by wire-drawing process is fluctuated because of string diameter, improve the wire drawing qualification rate of optical fiber.In addition, reducing the risk that prefabricated rods crack in deposition process.By the optimization of the levelness to lead screw, during moving forward and backward more at the uniform velocity, loosening body Density Distribution is more uniform for blowtorch platform, reduces to crack caused by loosening body density unevenness and scrap.
Description
Technical field
The invention belongs to preform manufacture and research and development technology field, is driven more particularly, to a kind of protection OVD
The device of lead screw.
Background technology
OVD (Outside Vapor deposition) technique is current to prepare the classic of low water peak or zero water peaks single mode optical fiber prefabricated rods
One of process, the technique are widely used by institute of domestic and international mainstream preform production firm.Plug prepared by OVD techniques
It is made of sandwich layer and optics covering two parts.
OVD process equipments include mainly chemical gas phase reaction and deposition chamber, gas burner and loosening body precasting bar rotation
Mechanism three parts composition.OVD technique blowtorch systems are designed with multigroup blowtorch under normal conditions.Sandwich layer blowtorch passes through with blowtorch platform
Lead screw below platform is interlocked mounted on the underface of prefabricated rods.The SiO generated after the gas reaction being blown in blowtorch2Dust grain
Son moves under gas initial velocity and thermophoresis effect to loosening body precasting bar, and is adhered to the surface of loosening body precasting bar.Spray
Lamp platform is moved back and forth by the gearing of lead screw along blowtorch guide rail, and prefabricated rods itself by a rotating bearing structure with certain
Speed rotates.By SiO under the conditions of process above2Particle is uniformly deposited on the female rod surface at the uniform velocity rotated in layer, most
End form is at columned prefabricated rods loosening body.OVD technologies have advantageous technology as the technique of production prefabricated rod cladding
Advantage, the burning gases being blown in blowtorch are generally CH4/O2, raw gas SiCl4.Generate the chemical equation of powder dust particle
Formula includes：
SiCl4+2H2O→SiO2+4HCl (2)
SiCl4+O2→2SiO2+2Cl2(3)
Pressure in chemical gas phase reaction and deposition chamber needs stability contorting, is carried out by an exhausting and air compensation device
Pressure is adjusted.
Loosening body precasting bar by one it is vitreous stick is fixed on collet, collet is rotated by motor.Spray
Lamp platform carries out front and back and lifting moving by lead screw, and as prefabricated rod outside diameter constantly becomes larger, blowtorch platform passes through elevating screw
The spacing of blowtorch and loosening body precasting bar is adjusted, blowtorch platform is transmitted lead screw driving and carries out front and back uniform motion simultaneously, in turn
Obtain the loosening body of density and uniform diameter.But under normal conditions since lead screw is longer, under the hot environment of depositing operation
It is susceptible to deformation, deposition chamber is acidic environment in addition, reacts the SiO of generation2Particle is easily adsorbed at drive lead screw surface,
Prolonged use causes ball screw accuracy to be deteriorated, generate loosening body Density Distribution it is uneven it is easy to crack, diameter difference is larger very
To the defects of generating gas line, deposition efficiency can be also reduced in addition.Meanwhile the iron ion that lead screw is generated by sour gas corrosion,
It volatilizees, can be infiltered in preform by air-flow carrying, these will all influence the quality of preform, lead under hot conditions
Cause preform unqualified so that scrappage increases, and increases the production cost of preform.
Invention content
In view of this, the invention is intended to overcome above-mentioned defect existing in the prior art, propose that a kind of protection OVD is passed
The device of dynamic lead screw.
In order to achieve the above objectives, the technical solution of the invention is realized in：
It is a kind of to protect the device of OVD drive lead screws, including the blowtorch platform being slidably mounted on guide rail, the blowtorch platform
On several blowtorch are installed；The drive lead screw of corresponding blowtorch platform, is provided with lead screw protective cover, the lead screw protective cover is equipped with
Several ventholes have been passed through nitrogen in lead screw protective cover, internal to form positive pressure cavity；It is equipped with and uses in the lead screw protective cover
It is passed through the temperature sensor and pressure sensor of flow in control nitrogen.
Further, the lead screw protective cover uses stainless steel cage.
Further, the U-shaped structure of blowtorch platform.
Further, the venthole is directed toward OVD deposit cavities.
Further, the venthole is uniformly arranged, a diameter of 1-1.5cm.
Compared with the existing technology, the invention has the advantage that：
The levelness of lead screw is optimized in the invention, and loosening body outer diameter is more uniform.It reduces in wire drawer
Sequence is scrapped caused by string diameter fluctuates, and improves the wire drawing qualification rate of optical fiber.In addition, reducing prefabricated rods in deposition process
The risk of cracking.By the optimization of the levelness to lead screw, blowtorch platform during moving forward and backward more at the uniform velocity, it is loose
Volume density distribution is more uniform, reduces to crack caused by loosening body density unevenness and scrap.
Description of the drawings
The attached drawing for constituting the part of the invention is used for providing further understanding the invention, present invention wound
The illustrative embodiments and their description made do not constitute the improper restriction to the invention for explaining the invention.
In attached drawing：
Fig. 1 is the structural schematic diagram of the invention；
Fig. 2 is structural schematic diagram when constituting sealing cooling conveyer system in the invention embodiment；
Fig. 3 is the vertical view that cooling conveyer system part-structure is sealed in the invention embodiment；
Fig. 4 is the structural schematic diagram of conveyer belt spindle portion in the invention embodiment；
Fig. 5 is the structural schematic diagram of conveyer belt and blowtorch platform coupling part in the invention embodiment.
Reference sign：
1- guide rails；2- blowtorch platforms；3- blowtorch；4- drive lead screws；5- lead screw protective covers；6- ventholes；7- temperature sensing
Device；8- pressure sensors；9- conveyer belt shafts；10- transmission belts；11- Teflon fixed plates；12- lead screw motors；13- screws；
14- track bases；15- lead screw pedestals；16- tie points.
Specific implementation mode
It should be noted that in the absence of conflict, the feature in embodiment and embodiment in the invention can
To be combined with each other.
In the description of the invention, it is to be understood that term "center", " longitudinal direction ", " transverse direction ", "upper", "lower",
The orientation or positional relationship of the instructions such as "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outside" is
It is based on the orientation or positional relationship shown in the drawings, is merely for convenience of description the invention and simplifies to describe, rather than indicate
Or imply that signified device or element must have a particular orientation, with specific azimuth configuration and operation, therefore cannot understand
For the limitation to the invention.In addition, term " first ", " second " etc. are used for description purposes only, and should not be understood as indicating
Or it implies relative importance or implicitly indicates the quantity of indicated technical characteristic." first ", " second " etc. are defined as a result,
Feature can explicitly or implicitly include one or more this feature.In the description of the invention, unless separately
It is described, the meaning of " plurality " is two or more.
In the description of the invention, it should be noted that unless otherwise clearly defined and limited, term " peace
Dress ", " connected ", " connection " shall be understood in a broad sense, for example, it may be being fixedly connected, may be a detachable connection, or integrally
Connection；It can be mechanical connection, can also be electrical connection；Can be directly connected, can also indirectly connected through an intermediary,
It can be the connection inside two elements.For the ordinary skill in the art, on being understood by concrete condition
State concrete meaning of the term in the invention.
The present invention will be described in detail below with reference to the accompanying drawings and embodiments creates.
A kind of device of protection OVD drive lead screws, as shown in Fig. 1 to 5, including the blowtorch being slidably mounted on guide rail 1 is flat
Platform 2, guide rail are mounted on track base 14, and several blowtorch 3 are equipped on the blowtorch platform 2；The driving wire of 3 platform of corresponding blowtorch
Bar 4, is provided with lead screw protective cover 5, and the lead screw protective cover 5 is equipped with several ventholes 6, has been passed through in lead screw protective cover 5
Nitrogen forms positive pressure cavity inside lead screw protective cover；It is equipped in the lead screw protective cover 5 and is passed through flow for controlling nitrogen
Temperature sensor 7 and pressure sensor 8.
It should be pointed out that the supply of nitrogen, can be extend into inside lead screw protective cover by corresponding pipeline and be supplied,
The flow of nitrogen is controlled by the valve on pipeline, and the actuator of adjustment valve opening is can be installed on valve (such as electricity
Dynamic push rod), the controller being electrically connected with temperature sensor and pressure sensor is connected on actuator, controller receives temperature
The feedback signal of sensor and pressure sensor, control actuator action, to reach the purpose of adjusting control valve aperture.
Wherein, the lead screw protective cover 5 uses stainless steel cage, durable, anti-corrosion.In addition, the blowtorch platform is in U
Type structure, facilitates structural member to arrange.Blowtorch platform interior contains several process gas branch lines, and each process gas branch
It is connected using hose between pipeline and the supervisor of process gas.
Wherein, the venthole 6 is directed toward OVD deposit cavities.In general, venthole 6 is uniformly arranged, a diameter of 1-1.5cm makees
For the venthole of cooling blowing, the air-flow of each venthole blowout forms the gas curtain for blowing to OVD deposit cavities side, passes through " gas
Envelope ", highly acid, hot environment when lead screw is deposited with OVD are isolated, to effectively lead screw be prevented to be corroded.
In an alternative embodiment, the sealing that device provided by the invention can be designed to a sealing cools down transmission
System is used to protect the precision of lead screw, specifically, the cooling transmission system of sealing may include four conveyer belt shafts 9, transmission belts
10, the temperature and pressure in Teflon fixed plate 11, sealing gland baffle and above-mentioned blowtorch platform and above-mentioned lead screw protective cover
Force snesor.Shaft is screwed on lead screw protective cover, and conveyor belt loop is arranged around the shaft positioned at drive lead screw homonymy,
And conveyer belt is connected to the bottom of blowtorch platform (conveyer belt can be connect by connectors such as screws with blowtorch mesa base, be
The reliability for ensureing connection, can be arranged multiple tie points 16, i.e., be connected and fixed with multiple screws), with lead screw protective cover shape
At a closed space, a closed space can be formed, specific driving form and connection structure can also
According to actual needs, it suitably changes or improves.
In order to ensure that blowtorch platform is at the uniform velocity smoothly mobile in the process of moving, and it is used for a long time.Countershaft it is same
Heart degree and requirement for horizontality are higher.And rigidity need to be selected high and the good material of wear-resisting property.The present invention devises one simultaneously
Shaft fixes adjusting apparatus.When conveyer belt and lead screw protective cover leakproofness it is bad when can by adjusting shaft X-direction pine
Tightness is to improve sealing effect.When the temperature in sealing device is more than 70 DEG C, temperature sensor feedback is adjusted in time to system
For temperature in N2 flows guarantee sealing device at 70 DEG C hereinafter, when the pressure in sealing device is less than 5Pa, pressure sensor is anti-
Feeding system adjusts N2 gas flows in time, adjusts the pressure in sealing device between 5-10pa.
Lead screw protective cover is stainless steel, is screwed in cavity bottom, lead screw protective cover respectively has two panels up and down
Overhanging baffle.Conveyer belt is moved in the top of baffle, and transmission belt is constituted by fixing Teflon cushion block in the top of baffle
Running track.
Above-mentioned OVD deposition chambers, lead screw protective cover, conveyer belt constitute a cavity structure.During deposition, lead screw
The N2 of lower section starts purging cooling, and cavity structure forms the environment of positive pressure, and N2 can be moved to from the gap of conveyer belt guide rail
Deposition chamber ensures that the cavity structure of protection lead screw is in lasting positive pressure environment.Keep maintenance one in cavity metastable
Micro-positive pressure environment, pressure control generally 5 to 10Pa or so, in OVD deposition process, the pressure in deposit cavity is tiny structure,
General control is -30 to -40Pa or so.
Since there are pressure differences in cavity structure and OVD deposit cavities, effectively by cavity structure internal environment and external rings
Border completely cuts off, and so that lead screw is in the sealing cavity completely cut off with external highly acid, hot environment, to prevent lead screw and sour gas
Contact, be effectively protected lead screw and be not corroded.Utilize the sealing cooling conveyer system and corresponding temperature, pressure in the present embodiment
Force snesor is used cooperatively, and can effectively improve the appearance diameter uniformity of OVD deposition loosening bodies, prefabricated to optimize OVD
Relevant parameters and the performances such as loose volume density, outer diameter fluctuation and the gas line of stick, while improving the deposition rate of prefabricated rods
A method of lead screw being protected in OVD deposition process using above-mentioned apparatus, is included the following steps：
1. before deposition starts, it is passed through nitrogen into lead screw protective cover, during deposition, leading screw is kept to receive always
The purging of nitrogen cools down；
2. in deposition process, according to the variation of the temperature and pressure in lead screw protective cover, the flow that adjustment nitrogen is passed through,
Make the positive pressure environment for maintaining pressure to be more than OVD deposition cavity pressures in lead screw protective cover always.
Wherein, the pressure in above-mentioned lead screw protective cover maintains 5-10Pa.
It is as follows using present apparatus OVD deposition process：
After checking plug appearance no problem, starts to hang stick, be used in combination torque spanner by collet screw fixation.Use clean-cloth
By mandrel surface wiped clean, blowtorch surface wipes are clean, installation fixes blowtorch cover, closes cavity door, and igniting starts to sink
Product.
Lead screw motor drives lead screw rotation, and by screw 13, as lead screw is moved forward and backward, (screw is mounted on silk to blowtorch platform
On bar), CH4、O2Process gas and SiCl4Be ejected into mandrel surface from blowtorch, with plug do not stop rotation formed prefabricated rods dredge
Song Ti.Exhausting valve at the top of cavity is gradually opened, and will fail to deposit to the SiO on prefabricated rods surface2Particle detaches deposition
Cavity, while the HCl gases and steam that reaction generates being detached, SiO2Particle has corrosivity, and it is acid that deposition reaction generates HCl
Gas also has corrosivity, SiO2Particle falls the essence that can influence lead screw surface under the acid environment of high temperature on lead screw surface
Degree, leads to lead screw in the process of running, and the blowtorch platform speed of service is uneven, influences the uniformity of prefabricated rod outside diameter.
After depositing operation starts, lead screw starts to rotate the device that the invention provides under the drive of lead screw motor 12
(lead screw one end is driven by lead screw motor, and the other end is mounted on lead screw pedestal 15), conveyer belt is bypassed positioned at lead screw homonymy
Shaft is interlocked by screw on blowtorch platform, and blowtorch platform is moved back and forth with the rotation of lead screw in deposition chamber.
Lead screw protective cover is screwed in deposition chamber bottom, is located at the Teflon fixed block of lead screw protective cover upper end
The gap for having 0.5~1cm between any two constitutes the operation guide rail of conveyer belt.It is constituted by lead screw protective cover and conveyer belt
The system of one opposing seal protects lead screw from corrosive gas HCl and SiO2The damage of particle.
Be gradually increasing with the carry out cavity temperature of depositing operation, drive the lead screw of blowtorch platform movement in itself heat production and
Under the influence of cavity thermal environment, temperature gradually rises.N below lead screw2Hole starts to increase N2 flows, ensures lead screw protection
Within system pressure between 5~10pa, and deposition chamber exhausting system adjustment lower chamber pressure in -30pa or so,
Under the action of deposition chamber and lead screw protective cover pressure difference, corrosive gas HCl and SiO can be effectively prevented2Particle enters
In lead screw protective device.
Pressure sensor below lead screw can feed back the real-time pressure in lead screw protective device in real time, work as protection
When pressure is less than 5Pa in device, system is automatically increased N2Hole opening degree adjusts the pressure in protective device.When in protective device
When pressure is more than 10Pa, system reduces N automatically2Hole opening degree adjusts the pressure in protective device.
For example, when temperature is higher than 70 DEG C in protective device, it is located at the temperature sensor feedback below lead screw to system, is
System is automatically increased N2Hole opening degree increases N2Flow accelerates the cooling of lead screw temperature, prevents from causing lead screw to deform because temperature is excessively high.And
After temperature is less than 60 DEG C, system reduces N automatically2Flow, one lead screw operating temperature of formation and working environment pressure controllable
Device.It is effectively reduced corrosive gas HCl and SiO2Damage of the particle to lead screw surface accuracy reduces because lead screw works
The excessively high lead screw slight deformation brought of temperature, and then the appearance diameter uniformity of prefabricated rods loosening body is optimized, it improves wire drawing and closes
Lattice rate.
Protective cover on the outside of lead screw not only can be to avoid SiO2Particle damages ball screw accuracy, while leading to below lead screw
The N that stomata sprays2Gas can effectively reduce the operating temperature of lead screw, ensure the precision of lead screw.Pressure sensor and temperature
Sensor with the use of can effectively ensure lead screw operating temperature and avoid SiO2Particle and corrosive gas are to lead screw
The damage on surface.
After depositing operation, depositing device cavity is begun to cool, the N being located at below lead screw2Gas persistently to lead screw into
Row cooling, while ensureing that lead screw protection internal mask pressure is higher than chamber pressure, prevent the entrance of HCl corrosive gas.Cooling terminates
Afterwards, prefabricated rods loosening body is taken out using mechanical arm from cavity, carries out hygienic cleaning, the N being located at below lead screw2Gas continues
The pressure in guarantee lead screw protective device is sprayed in 5~10pa, prevents the loosening body dust of cavity from entering lead screw protective device.
The levelness of lead screw is optimized in the invention, and loosening body outer diameter is more uniform.It reduces in wire drawer
Sequence is scrapped caused by string diameter fluctuates, and improves the wire drawing qualification rate of optical fiber.In addition, reducing prefabricated rods in deposition process
The risk of cracking.By the optimization of the levelness to lead screw, blowtorch platform during moving forward and backward more at the uniform velocity, it is loose
Volume density distribution is more uniform, reduces to crack caused by loosening body density unevenness and scrap.
Meanwhile also effectively increasing the deposition rate and deposition efficiency of prefabricated rods.Pass through the level and anti-deformation to lead screw
Optimization, making it, prefabricated rods all-the-time stable is in the underface of torch flame in deposition process, to improve the deposition of prefabricated rods
Efficiency and deposition efficiency.The output of equipment is also improved, the device standby time is shortened.It, can be with by the seal protection to lead screw
Effectively reduce SiO2, the damage of the erosive partis to lead screw such as HCl, extend the maintenance period and replacement cycle of equipment, contract
It is short standby caused by plant maintenance and replacement lead screw.
The foregoing is merely the preferred embodiments of the invention, are not intended to limit the invention creation, all at this
Within the spirit and principle of innovation and creation, any modification, equivalent replacement, improvement and so on should be included in the invention
Protection domain within.
Claims (5)
1. a kind of device of protection OVD drive lead screws, it is characterised in that：Including the blowtorch platform being slidably mounted on guide rail, institute
It states and several blowtorch is installed on blowtorch platform；The drive lead screw of corresponding blowtorch platform, is provided with lead screw protective cover, and the lead screw is protected
Shield is equipped with several ventholes, and nitrogen has been passed through in lead screw protective cover, internal to form positive pressure cavity；The lead screw protection
The temperature sensor and pressure sensor that flow is passed through for controlling nitrogen are equipped in cover.
2. a kind of device of protection OVD drive lead screws according to claim 1, it is characterised in that：The lead screw protective cover
Using stainless steel cage.
3. a kind of device of protection OVD drive lead screws according to claim 1, it is characterised in that：The blowtorch platform is in U
Type structure.
4. a kind of device of protection OVD drive lead screws according to claim 1, it is characterised in that：The venthole is directed toward
OVD deposit cavities.
5. a kind of device of protection OVD drive lead screws according to claim 1, it is characterised in that：The venthole is uniformly distributed
Setting, a diameter of 1-1.5cm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721884763.2U CN207987042U (en) | 2017-12-28 | 2017-12-28 | A kind of device of protection OVD drive lead screws |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721884763.2U CN207987042U (en) | 2017-12-28 | 2017-12-28 | A kind of device of protection OVD drive lead screws |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN207987042U true CN207987042U (en) | 2018-10-19 |
Family
ID=63817343
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201721884763.2U Active CN207987042U (en) | 2017-12-28 | 2017-12-28 | A kind of device of protection OVD drive lead screws |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN207987042U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108147656A (en) * | 2017-12-28 | 2018-06-12 | 江苏通鼎光棒有限公司 | A kind of device and method for protecting OVD drive lead screws |
-
2017
- 2017-12-28 CN CN201721884763.2U patent/CN207987042U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108147656A (en) * | 2017-12-28 | 2018-06-12 | 江苏通鼎光棒有限公司 | A kind of device and method for protecting OVD drive lead screws |
| CN108147656B (en) * | 2017-12-28 | 2023-11-24 | 通鼎互联信息股份有限公司 | Device and method for protecting OVD transmission screw rod |
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| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| TR01 | Transfer of patent right | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20220808 Address after: 215233 Xiaoping Avenue, eight Town, Zhen Ze town, Wujiang District, Suzhou, Jiangsu 8 Patentee after: TONGDING INTERCONNECTION INFORMATION Co.,Ltd. Patentee after: JIANGSU TONGDING OPTICAL WAND Co.,Ltd. Address before: 215233 Tongjin Avenue, Wujiang Economic Development Zone, Suzhou, Jiangsu Patentee before: JIANGSU TONGDING OPTICAL WAND Co.,Ltd. |