A kind of fibre coating UV LED curing apparatus and methodTechnical field
The present invention relates to optic fibre manufacturing technology field, the curing apparatus of coating and side when specifically a kind of high speed fibre wire drawingThe UV LED curing apparatus and method of coating when a kind of method, especially high speed fibre wire drawing.
Background technique
Need to coat one or more layers coat as its protective layer by the optical fiber that preform is drawn into suitable dimension.Typically, bare fibre passes through wet either wet to dry (wet-to-dry) technique applied in two coats or two layers to wet (wet-to-wet)Above coating.A usual softer inner coating is micro-bend for preventing optical fiber from generating, and a harder external coating plays optical fiberMechanical protection effect, protects optical fiber from external force.The solidification of fibre coating can use heat cure or ultraviolet light (UV)Solidification.
Ultraviolet light, which solidifies, to be referred to the optical fiber of applying coating is placed in ultraviolet light environments, using in ultraviolet excitation coatingPhotoinitiator causes coating in turn and crosslinks reaction, makes its instantaneous solidification at solid material.Recently as optical fiber purchasing priceLattice persistently drop, and the cost for how reducing optical fiber production process becomes the research hotspot of optical fiber industry in recent years.Improve wire drawingSpeed and then the production efficiency for improving optical fiber are to reduce one of the direction of optical fiber production cost.The drawing speed for improving optical fiber needsReduce curing time.
Drawing process relatively mostly uses mercury lamp (e.g., high-pressure sodium lamp or mercury xenon lamp) to generate needed for coating ultra-violet curing at presentUltraviolet radioactive.Traditional mercury lamp by the indoor generation electric arc of ionized gas (usually mercury) with excited atom, thus toIt is outer to shine.The shortcomings that mercury lamp is that a large amount of energy consumption is needed to carry out painting of the cured coated on optical fiber to generate the ultraviolet light of sufficient intensityLayer.Such as, the power consumption of 50kw is taken around to generate the ultraviolet light of sufficient intensity for solidifying single layer coating layer.
Mercury lamp has another disadvantage that mercury lamp generation spectral region is wider, and wavelength is greater than 200nm and is less than 700nm, usuallyThe only light of 300nm~400nm wave band is useful to ultra-violet curing technical process, and the light of this subband only accounts for the light of mercury lamp generationSpectrum less than 20%, i.e., major part electromagnetic radiation caused by mercury lamp is wasted, and capacity usage ratio is low.Meanwhile mercury lamp generationInfrared light can generate a large amount of heat, need additionally to increase cooling equipment to prevent apparatus overheat.
With the development of UV LED (UV LED) technology, UV LED has more as UV radiation source, UV LEDThe long service life.In general, the service life of mercury lamp only has 4000~6000 hours, and the service life of UV LED, to can achieve 30000 smallWhen.
Another advantage of UV LED is its environment friendly.UV LED device mercury-free, and will not be generated in use processOzone.UV LED device light source only concentrates on UVA wave band simultaneously, does not generate the light for the UVC wave band being harmful to the human body.
Finally, UV LED only generates the spectrum of 300nm~400nm wave band, capacity usage ratio is high.The infrared of fever is not generatedThe light of wave band, without additional cooling equipment.
Authorization Notice No. is that the patent of invention " using the solidification equipment of angled UV LED " of " CN 102336530B " is publicA kind of solidification equipment of fibre coating is opened, which has a similar cylindroid inner cavity, and inner surface has reflectivity；It willUV LED light source is placed in a focus line of cylindroid chamber, coats the optical fiber of coating by another focus line, to realize lightThe solidification of fine coating；According to elliptical optical characteristics, the UV issued from the UV LED on a focus straight line of cylindroid chamber is penetratedLine is converged at after elliptical-intracavity reflects on the optical fiber on another focus straight line；Traditional mercury lamp that this curing mode is continued to use is solidChange the spot mode of equipment, but 360 degree of directions of mercury lamp shine, and UV LED then only shines along straight line, it is upward in the sender of lightIt is restricted, thus there is a problem of luminous intensity deficiency, so there may be deficiencies for this curing apparatus curing uniformity；This is speciallyBenefit also recognizes the insufficient defect of curing uniformity, and patent proposes UV LED light source spatially spiral shell in multistage solidification cavityArray arrangement is revolved, but will definitely increase the complexity of curing apparatus structure in this way；Furthermore this solidification that the patent proposes is setThe standby UV LED light source for solidifying cavity at every section and using single side, in this way it is equally possible that there are UV luminous intensity deficiency is so as to cause solidificationThe insufficient possibility of efficiency.
For solution " CN 102336530B " patent of invention " using the solidification equipment of angled UV LED " it is above notFoot, Authorization Notice No. are that the patent of invention " a kind of fibre coating ultraviolet curing equipment and method " of " CN 103319100B " proposesA kind of tubular UV LED light fibre coating curing devices, which has a tubular installation pedestal, in tubular installation pedestalChamber circumferentially with axially mounted UV LED light source module, configures cylindrical focusing lens before UV LED light source module light-emitting surface, makesThe ultraviolet light for obtaining the transmitting of UV LED light source module focuses on a solidification axis；Tubular installation pedestal is cylindric or polygonTubular is circumferentially spliced by bar shaped circular arc block or bar shaped trapezoid block.It is covered with UV inside one side tubular installation pedestal in this wayThe module of LED undoubtedly increases the complexity of device structure, as long as on the other hand single side installs UV LED module energy in factIt is fully used the solidifications of optical fiber coatings when being just able to satisfy high-speed wire-drawing, which proposes each inside tubular installation pedestalUV LED light source is installed in direction, causes the waste of energy.
Summary of the invention
For deficiency present on above-mentioned patented technology, the present invention provides a kind of UV LED light source module light-emitting surface anglesVariable fibre coating curing apparatus and method, the device structure is simple, setting is reasonable, energy utilization is abundant, less energy consumption, solidificationIt is high-efficient, curing uniformity is good.
The present invention realizes by the following technical solutions:
A kind of fibre coating curing apparatus of UV LED light source module light-emitting surface variable-angle comprising oval tubular solidificationCavity, cross section is ellipse, and the inner surface of cavity has reflectivity, and the oval tubular solidification cavity has two pointsNot Jing Guo the ellipse two focuses and the focus straight line vertical with cross section, it is characterised in that: can by the angleThe UV LED light source module of change is placed at the first focus straight line, and the reverse extending for the ultraviolet light that UV LED light source is emittedLine is substantially vertical to pass through the first focus straight line；The travel path for being coated with the optical fiber of protection coat is set as and secondFocus straight line essentially coincides.
Preferably, the UV LED light source module of the variable-angle include UV LED light source, UV LED light source mounting base,Refrigerating module.
Preferably, the UV LED light source mounting base in the process of work with fixed circumferential speed rotation or withUnfixed circumferential speed rotation, so that UV LED light source be driven to be rotated using the first focus straight line as axis.
Preferably, transparent glass protection pipe, the transparent glass protection pipe are installed outside the second focus straight lineAxis be overlapped with the second focus straight line.
Preferably, one end of the transparent glass protection pipe is connected with pressure gas source, and the pressure gas source is lazyProperty gas source, is perhaps Nitrogen source gases or the mixing gas source for the two.
Preferably, the UV LED light source is UV single LED lamp and/or UV LED array.
Preferably, the UV optical source wavelength of the UV LED light source is one of 365nm, 375nm, 385nm, 395nmOr it is several.
Preferably, the UV LED light source module is connected with corresponding control module, to control connected UV LEDThe intensity for the ultraviolet light that light source module is emitted.
It is a kind of that optical fiber coating UV LED curing method is carried out using the fibre coating curing apparatus, it is characterised in that:1) optical fiber for being coated with coat passes through oval tubular and solidifies cavity, makes the travel path of optical fiber and solidifies the second coke of cavityPoint straight line essentially coincides；2) start UV LED light source curing module；3) the optical fiber edge coated with coat solidifies the second of cavityFocus straight line is at the uniform velocity or speed change passes through solidification cavity.
Preferably, the travel speed of the optical fiber for being coated with protection coat is 800m/min to 2800m/min.
The utility model has the advantages that
The present invention is used for the solidification of optical fiber coating using the UV LED light source of variable-angle, and beneficial effect is:1. using the coat of UV LED light source curing optical fiber, low energy consumption, calorific value is small, the service life is long, and curing efficiency is high, uniformity is good；②The present invention uses the UV LED light source module of variable-angle, and very good solution UV LED light source only prolongs straight line and shines, single UVLED light source is since light emitting angle problem solidification energy is inadequate, ellipse by being mounted on the problem of multiple UV LED light source energy dissipationsThe rotation that cylindrical shape solidifies the UV LED light source module on cavity the first focus straight line makes the light emitting angle of UV LED light source become larger,Solidify cavity in conjunction with the oval tubular with reflective interior surfaces, will measure and concentrate on the second focus straight line that optical fiber passes through；The speed of rotation by changing UV LED light source module matches different drawing speed of optical fibers；3. by changing UV LED light source mouldThe speed of rotation of block matches different drawing speed of optical fibers；4. volatile matter meeting of the coat of optical fiber in solidification, in coatVolatilization, to pollute UV LED light source, installation transparent glass tube can be contaminated to avoid UV LED light source；5. transparent glass is protectedIt is passed through inert gas or nitrogen or its mixed gas in pipe, a part of volatile matter can be taken away, moreover it is possible in the painting in optical fiberOxygen-free environment is formed around coating, reduces the consumption of free radical in coat, and then improve curing efficiency；6. UV LED light source mouldThe refrigerating module of block can be small-sized fan or water-cooling, can reduce the volume of equipment.
Detailed description of the invention
The following describes the present invention in detail with reference to the accompanying drawings and specific embodiments:
There is Fig. 1 the oval tubular of reflective interior surfaces to solidify cavity cross section figure.
The cross-sectional view of Fig. 2 UV LED curing apparatus.
Specific embodiment
The illustrative embodiments of the disclosure are more fully described below with reference to accompanying drawings.Although showing this public affairs in attached drawingThe illustrative embodiments opened, it being understood, however, that may be realized in various forms the disclosure without the reality that should be illustrated hereThe mode of applying is limited.It is to be able to thoroughly understand the disclosure on the contrary, providing these embodiments, and can be by this public affairsThe range opened is fully disclosed to those skilled in the art.
Curing apparatus of the invention includes that inner surface has reflexive oval tubular solidification cavity as depicted in figs. 1 and 21, rotatable UV LED light source mounting seat 2, UV LED light source 3, UV LED light source refrigerating module 4, transparent glass protection pipe5.The rotatable UV LED light source mounting seat 2 is rotated according to drawing speed with different rotation speeds, is reachedEnough luminous intensities realize the solidification of optical fiber coating.The UV wavelength of UV LED light source 3 is in the UV LED curing apparatus395nm.The UV LED light source is installed on oval solidify on the first focus straight line of chamber.The UV LED light source cooling mouldBlock is one group of small fan.The diameter of the transparent glass protection pipe 5 is about 26.2mm, and internal diameter is about 22.8mm.Described is saturatingBright glass protection pipe 5 is quartz glass tube, on the second focus straight line that oval tubular solidify cavity, center axis thereof and theTwo focus straight lines essentially coincide.One end of the transparent glass protection pipe 5 is connected with pressure gas source, and the gas source is nitrogenGas.The optical fiber come out from fibre drawing furnace is after supercooling, after coated fiber coat at applicator, passes through transparent glass and protectsPillar 5 absorbs the UV ray for the UV LED light source being mounted in rotatable UV LED light source mounting seat along the second focus straight lineRealize the solidification of coat.
The foregoing is only a preferred embodiment of the present invention, but scope of protection of the present invention is not limited thereto,In the technical scope disclosed by the present invention, any changes or substitutions that can be easily thought of by anyone skilled in the art,It should be covered by the protection scope of the present invention.Therefore, protection scope of the present invention should be with the protection model of the claimSubject to enclosing.