CN103809618A - Automatic online control method and device for coating diameters in wiredrawing process - Google Patents
Automatic online control method and device for coating diameters in wiredrawing process Download PDFInfo
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Abstract
The invention relates to the field of an optical fiber manufacturing technology, particularly aims to a wet-on-wet coating technology, and specifically relates to an automatic online control method and an automatic online control device for coating diameters in a wiredrawing process. The method comprises internal coating diameter control and external coating diameter control, and comprises the steps of feeding back the diameter of an internal coating and the diameter of an external coating to a PLC (Programmable Logic Controller) on line through a gauging arrangement, and controlling the temperature of a coated cup, internal coating pressure, He flow or the temperature of an external coated cup, external coating pressure and the temperature of externally coating dressing by the PLC according to the diameter of the internal coating and the diameter of the external coating. According to the method, the diameter of the internal coating and the diameter of the external coating are fed back to the PLC on line through the gauging arrangement, and online adjustment and control are realized by the PLC, so that the stability of the diameter of an optical coating can be greatly improved; and furthermore, the coating diameters of the optical internal and external coatings are fluctuated in a narrower scope, so that the method has a significant meaning on the production efficiency improvement of the optical fibers and the obtaining of high-quality optical fibers.
Description
Technical field
The present invention relates to optic fibre manufacturing technology field, for wetting to wet coated technique, be specifically related to apply in a kind of drawing process method and the device thereof of the on-line automatic control of diameter especially.
Background technology
Along with the construction of " broadband China " implementation and 4G network is carried out, market will significantly increase the demand of optical fiber, and optical fiber industry will take a turn for the better by basic side gradually, and form explosive growth.In the face of the powerful market demand, competitively improvement of production process of Ge great optical fiber producer, enhances productivity, to increase market share.The common method of enhancing productivity has two kinds: 1. use large-sized preform to carry out wire drawing; 2. improve drawing speed.But in the time improving drawing speed, the series of process problems such as excessive, cooling deficiency, inherent vice increase usually can fluctuate with string diameter.The high quality optical fiber that like this, how obtains stable performance under higher drawing speed just become fiber manufacturing in a very important major issue.
High-quality optical fiber requires have high precision and more stable external diameter, high physical strength, low decay, defect that also will be as far as possible few.Coated technique has decisive influence for the precision and stability of optical fiber external diameter, and meanwhile, overlay diameter also has very large impact to the various performances of optical fiber, as microbending loss performance, environmental testing performance, peeling force performance and colorability etc.Particularly, for some small diameter fiber, as the G.657 bending non-sensitive optical fiber of 200um, thereby in the process of preparation high quality optical fiber need inside and outside coating diameter to carry out very strict control.
Multiple technological parameters of drawing optical fibers can exert an influence to the coating diameter of optical fiber, as drawing speed, and the He airshed of cooling tube, pressure and the coating cup temperature etc. of painting dressing.Be mostly to adopt single technological parameter to adjust to the adjustment of fiber coating layer diameter at present, and mostly adopt manual mode.This single parameter or the mode of manually adjusting can produce a large amount of technique and Cost Problems conventionally: as excessive in overlay diameter fluctuation in drawing process, He gas use amount is excessive etc.
Summary of the invention
For the deficiency existing in prior art, the invention provides a kind of can on-line automatic adjustment and control, coating stablize, fluctuate and apply method and the device thereof of the on-line automatic control of diameter in the drawing process little, production efficiency is high, optical fiber quality is good.
To achieve these goals, the present invention realizes by the following technical solutions:
In a kind of drawing process, apply the method for the on-line automatic control of diameter, it comprises internal coating diameter control and external coating diameter control, by caliper online feedback internal coating diameter, external coating diameter to PLC, in the time that internal coating diameter, external coating diameter equate with desired value, the condition that maintains setting is constant; In the time that internal coating diameter is less than or greater than desired value, PLC controls interior coating cup temperature, interior painting pressure, He flow or He flow, interior painting pressure, interior coating cup temperature online adjusting internal coating diameter successively according to internal coating diameter; In the time that external coating diameter is less than or greater than desired value, PLC controls outer coating cup temperature, outer painting pressure, outer coating material temperature degree on-line control external coating diameter successively according to external coating diameter.
In above-mentioned a kind of drawing process, apply the method for the on-line automatic control of diameter, when the internal coating diameter described in it is less than desired value, coating cup temperature in slowly increasing with certain temperature adjustment step-length, temperature adjustment step-length of every increase all needs to wait for certain constant temperature interval; In the time that interior coating cup temperature increases to higher limit and internal coating diameter and is still less than desired value, in setting, coating cup temperature is higher limit, and is coated with pressure in improving with certain step-length voltage regulating, and step-length voltage regulating of every increase all needs to wait for certain constant voltage interval; In the time that interior painting pressure is brought up to higher limit and internal coating diameter and is still less than desired value, in setting, coating cup temperature is that higher limit, interior painting pressure are higher limit, and increase the He flow of cooling tube with certain flow steps, flow steps of every increase all need to wait for certain chilling room every, further increase internal coating diameter, to reach desired value.
In above-mentioned a kind of drawing process, apply the method for the on-line automatic control of diameter, when the internal coating diameter described in it is greater than desired value, gradually reduce the He flow of cooling tube with certain flow steps, flow steps of every minimizing all need to wait for certain chilling room every; When the He of cooling tube flow reduces to zero and internal coating diameter while being still greater than desired value, the He flow of setting cooling tube is zero, and progressively reduces interior painting pressure with certain step-length voltage regulating, and often reducing a step-length voltage regulating all needs to wait for certain constant voltage interval; In the time that interior painting pressure is reduced to lower limit and internal coating diameter and is still greater than desired value, the He flow of setting cooling tube is zero, interior painting pressure is lower limit, and progressively reduce interior coating cup temperature with certain temperature adjustment step-length, often reduce a temperature adjustment step-length and all need to wait for certain constant temperature interval, further reduce internal coating diameter, to reach desired value.
In above-mentioned a kind of drawing process, apply the method for the on-line automatic control of diameter, the temperature adjustment step-length described in it is 0.5～1 ℃; Step-length voltage regulating is 0.2～0.8bar; Described flow steps is 0.1～0.8L/min.
The method that applies the on-line automatic control of diameter in above-mentioned a kind of drawing process, the constant temperature described in it is spaced apart 2min; Constant voltage is spaced apart 30s; Chilling room is divided into 1min.
In above-mentioned a kind of drawing process, apply the method for the on-line automatic control of diameter, when the external coating diameter described in it is less than desired value, increase gradually outer coating cup temperature with certain temperature adjustment step-length, temperature adjustment step-length of every increase all needs to wait for certain constant temperature interval; In the time that outer coating cup temperature increases to higher limit and external coating diameter and is still less than desired value, setting outer coating cup temperature is higher limit, and improves outer painting pressure with certain step-length voltage regulating, and step-length voltage regulating of every increase all needs to wait for certain constant voltage interval; In the time that outer painting pressure is brought up to higher limit and external coating diameter and is still less than desired value, setting outer coating cup temperature is that higher limit, outer painting pressure are higher limit, and increase outer coating material temperature degree with certain material temperature step-length, material temperature step-length of every increase all needs to wait for certain control interval, further increase external coating diameter, to reach desired value.
In above-mentioned a kind of drawing process, apply the method for the on-line automatic control of diameter, when the external coating diameter described in it is greater than desired value, gradually reduce outer coating cup temperature with certain temperature adjustment step-length, temperature adjustment step-length of every minimizing all needs to wait for certain constant temperature interval; In the time that outer coating cup temperature reduces to lower limit and external coating diameter and is still greater than desired value, setting outer coating cup temperature is lower limit, and progressively reduces outer painting pressure with certain step-length voltage regulating, and often reducing a step-length voltage regulating all needs to wait for certain constant voltage interval; In the time that outer painting pressure is reduced to lower limit and external coating diameter and is still greater than desired value, setting outer coating cup temperature is that lower limit, outer painting pressure are lower limit, and progressively reduce outer coating material temperature degree with certain material temperature step-length, often reduce a material temperature step-length and all need to wait for certain control interval, further reduce external coating diameter, to reach desired value.
In above-mentioned a kind of drawing process, apply the method for the on-line automatic control of diameter, the temperature adjustment step-length described in it is 0.5～1 ℃; Step-length voltage regulating is 0.1～0.6bar; Described material temperature step-length is 0.3～0.8 ℃.
The method that applies the on-line automatic control of diameter in above-mentioned a kind of drawing process, the constant temperature described in it is spaced apart 2min; Constant voltage is spaced apart 30s; Control interval is 1min.
In a kind of drawing process, apply the on-line automatic control device of diameter, comprise successively fiber drawing furnace, cooling tube, interior coating cup, outer coating cup, UV lamp and stretching pulley, take-up reel, cooling tube outlet described in it arranges bare fibre caliper, overlay diameter tester is set between described UV lamp and stretching pulley, described overlay diameter tester is connected with PLC signal input part, and PLC signal output part is connected with cooling tube, interior coating cup, outer coating cup respectively.
Beneficial effect:
The present invention by caliper online feedback internal coating diameter and external coating diameter to PLC, by PLC according to coating cup temperature, interior painting pressure, He flow or outer coating cup temperature, outer painting pressure, outer coating material temperature degree in internal coating diameter, external coating diameter control, reach on-line control and control, this method significantly improves the stability of fibre coating diameter, optical fiber ectonexine coating diameter is fluctuateed in narrower scope, have great importance for improving the production efficiency of optical fiber and obtaining high quality optical fiber.
Accompanying drawing explanation
Describe the present invention in detail below in conjunction with the drawings and specific embodiments;
Fig. 1 is the structural representation of apparatus of the present invention.
Embodiment
For technological means, creation characteristic that the present invention is realized, reach object and effect is easy to understand, below in conjunction with embodiment, further set forth the present invention.
Under drawing speed with 2000m/min, producing G.652 optical fiber is example.In order to produce qualified optical fiber, (internal coating diameter is in the scope of 190 ± 10 μ m, external coating diameter is in the scope of 245 ± 10 μ m), conventionally be 6bar by being coated with pressure initial value in setting, interior coating cup initial value is 50 ℃, He flow initial value is 6L/min, outer painting pressure initial value is 6.5bar, outer coating cup temperature initial value is 52 ℃, coating temperature initial value is 47.5 ℃, but the inside and outside coating diameter of optical fiber still can produce fluctuation, the scope of its fluctuation is respectively: 184～197 μ m, 238～253 μ m.
With reference to Fig. 1, will this scheme of the invention be described with concrete example below:
Device of the present invention comprises fiber drawing furnace 2, cooling tube 3, interior coating cup 5, outer coating cup 6, UV lamp 7 and stretching pulley 9, take-up reel 11 successively, cooling tube 3 outlets arrange bare fibre caliper 4, overlay diameter tester 8 is set between UV lamp 7 and stretching pulley 9, described overlay diameter tester 8 is connected with PLC10 signal input part, and PLC10 signal output part is connected with cooling tube 3, interior coating cup 5, outer coating cup 6 respectively.
Its drawing process is: prefabricated rods 1 is under 2000 ℃ of high temperature actions of fiber drawing furnace 2, melt to free fall state, by the effect of tractive force, be pumped into bare fibre, bare fibre is after cooling tube 3 coolings, the coating of coated system, UV lamp 7 solidifies, and air is cooling, then under the effect of stretching pulley 9, be wrapped on take-up reel 11, complete wire drawing.
Embodiment 1
The internal coating diameter recording when caliper 8 is 185.5 μ m, and coating cup temperature T 1 in PLC10 regulates, increases gradually with the step-length of 1 ℃, and step-length of every increase need wait 2min after temperature stabilization, then increases T1.Along with the increase of interior coating cup temperature, it is large that internal coating diameter also becomes gradually.In the time that T1 is increased to 60 ℃, reach higher limit, now internal coating diameter is 186.3 μ m, stops increasing, and T1 maintains 60 ℃.If continue to increase and will cause the coating coating effect that wields influence in a large number.Then, in improving with 0.2bar step-length, be coated with pressure P 1, step-length of every increase need wait 30s after pressure stability, increase again P1, in the time that P1 brings up to 8bar, reach interior painting upper pressure limit, stop increasing interior painting pressure, will overflow mould if continue to increase coating, now the interior painting diameter of optical fiber is 188.4 μ m, does not reach yet desired value.Step-length with 0.1L/min reduces He airshed, and step-length of every increase need wait 1min after L is stable, then increases, in the time that He airshed L is increased to 7.5L/min, and the desired value 190 μ m of internal coating diameter.
Embodiment 2
The internal coating diameter recording when caliper 8 is 196.2 μ m, and PLC10 regulates cooling tube He airshed L, reduces gradually He airshed with the step-length of 0.1L/min, often reduces a step-length and need wait 1min after L is stable, then reduce.Along with the minimizing of L, internal coating diameter also reduces gradually.In the time that L reduces to 0, now internal coating diameter is 192.7 μ m, stops reducing, and L maintains 0, and reduce interior painting pressure P 1 with 0.2bar step-length, often reduce a step-length and need wait 30s after P1 is stable, then reduce, in the time that interior painting pressure is reduced to 4bar, reach lower limit, stop reducing interior painting pressure, now the internal coating diameter of optical fiber is 190.8 μ m, does not reach yet desired value.Now, coating cup temperature T 1 in reducing with the step-length of 1 ℃, often reduces the 2min such as a step-length after T1 is stable, then reduces, and in the time that T1 is reduced to 48 ℃, internal coating diameter reaches desired value 190 μ m.
Embodiment 3
When the external coating diameter recording when caliper 8 is 239.6 μ m, PLC10 controls, and increases gradually outer coating cup temperature T 2 with the step-length of 1 ℃, and step-length of every increase need wait 2min after T2 temperature, then increases.With T2 rising gradually, external coating diameter increases gradually; In the time that T2 reaches 60 ℃, now external coating diameter is 240.3 μ m, does not reach yet desired value, stops increasing T2, and setting T2 is 60 ℃, and improves the outer pressure P 2 that is coated with 0.2bar step-length, and step-length of every raising need wait 30s after outer painting pressure stability, then improves; In the time that P2 reaches 8bar, now external coating diameter is 243.5 μ m, does not reach yet desired value, and setting P2 is 8bar, and increases gradually outer coating material temperature degree T3 with the step-length of 0.5 ℃, and step-length of every increase need wait 1min after T3 is stable, then increases.In the time that T3 increases to 58.5 ℃, interior painting diameter reaches desired value 245 μ m.
Embodiment 4
When the external coating diameter recording when caliper 8 is 251.3 μ m, PLC10 controls, and reduces gradually outer coating cup temperature T 2 with the step-length of 1 ℃, and step-length of every increase need wait 2min after T2 is stable, then reduces.With reducing of T2, external coating diameter also reduces gradually; In the time that T2 reaches 40 ℃, now external coating diameter is 250.4 μ m, and external coating diameter does not reach desired value yet, and setting T2 is 40 ℃, and reduces outer painting pressure P 2 with 0.2bar step-length, need wait 30s after P2 is stable, then reduce while often reducing a step-length; In the time that outer painting pressure P 2 is reduced to lower limit 4bar, now external coating diameter is 247.6 μ m.External coating diameter does not reach desired value yet, and setting P2 is 5bar, and reduces gradually outer coating material temperature degree T3 with the step-length of 0.5 ℃, often reduces a step-length and need wait 1min after T3 is stable, then reduce.In the time that T3 increases to 45.5 ℃, external coating diameter reaches desired value 245 μ m.
Find by a large amount of case studies, use the present invention the inside and outside coating diameter of optical fiber G.652 can be controlled at respectively in the scope of 190 ± 0.5 μ m and 245 ± 1 μ m, more much lower than present GB requirement far away, go out high quality optical fiber for high-speed production significant.
More than show and described ultimate principle of the present invention and principal character and advantage of the present invention.The technician of the industry should understand; the present invention is not restricted to the described embodiments; that in above-described embodiment and instructions, describes just illustrates principle of the present invention; without departing from the spirit and scope of the present invention; the present invention also has various changes and modifications, and these changes and improvements all fall in the claimed scope of the invention.The claimed scope of the present invention is defined by appending claims and equivalent thereof.
Claims (10)
1. in a drawing process, apply the method for the on-line automatic control of diameter, it is characterized in that, comprise internal coating diameter control and external coating diameter control, by caliper online feedback internal coating diameter, external coating diameter to PLC, in the time that internal coating diameter, external coating diameter equate with desired value, the condition that maintains setting is constant; In the time that internal coating diameter is less than or greater than desired value, PLC controls interior coating cup temperature, interior painting pressure, He flow or He flow, interior painting pressure, interior coating cup temperature online adjusting internal coating diameter successively according to internal coating diameter; In the time that external coating diameter is less than or greater than desired value, PLC controls outer coating cup temperature, outer painting pressure, outer coating material temperature degree on-line control external coating diameter successively according to external coating diameter.
2. in a kind of drawing process according to claim 1, apply the method for the on-line automatic control of diameter, it is characterized in that, when described internal coating diameter is less than desired value, coating cup temperature in slowly increasing with certain temperature adjustment step-length, temperature adjustment step-length of every increase all needs to wait for certain constant temperature interval; In the time that interior coating cup temperature increases to higher limit and internal coating diameter and is still less than desired value, in setting, coating cup temperature is higher limit, and is coated with pressure in improving with certain step-length voltage regulating, and step-length voltage regulating of every increase all needs to wait for certain constant voltage interval; In the time that interior painting pressure is brought up to higher limit and internal coating diameter and is still less than desired value, in setting, coating cup temperature is that higher limit, interior painting pressure are higher limit, and increase the He flow of cooling tube with certain flow steps, flow steps of every increase all need to wait for certain chilling room every, further increase internal coating diameter, to reach desired value.
3. in a kind of drawing process according to claim 1, apply the method for the on-line automatic control of diameter, it is characterized in that, when described internal coating diameter is greater than desired value, gradually reduce the He flow of cooling tube with certain flow steps, flow steps of every minimizing all need to wait for certain chilling room every; When the He of cooling tube flow reduces to zero and internal coating diameter while being still greater than desired value, the He flow of setting cooling tube is zero, and progressively reduces interior painting pressure with certain step-length voltage regulating, and often reducing a step-length voltage regulating all needs to wait for certain constant voltage interval; In the time that interior painting pressure is reduced to lower limit and internal coating diameter and is still greater than desired value, the He flow of setting cooling tube is zero, interior painting pressure is lower limit, and progressively reduce interior coating cup temperature with certain temperature adjustment step-length, often reduce a temperature adjustment step-length and all need to wait for certain constant temperature interval, further reduce internal coating diameter, to reach desired value.
4. according to the method that applies the on-line automatic control of diameter in a kind of drawing process described in claim 2 or 3, it is characterized in that, described temperature adjustment step-length is 0.5～1 ℃; Step-length voltage regulating is 0.2～0.8bar; Described flow steps is 0.1～0.8L/min.
5. according to the method that applies the on-line automatic control of diameter in a kind of drawing process described in claim 2 or 3, it is characterized in that, described constant temperature is spaced apart 2min; Constant voltage is spaced apart 30s; Chilling room is divided into 1min.
6. in a kind of drawing process according to claim 1, apply the method for the on-line automatic control of diameter, it is characterized in that, when described external coating diameter is less than desired value, increase gradually outer coating cup temperature with certain temperature adjustment step-length, temperature adjustment step-length of every increase all needs to wait for certain constant temperature interval; In the time that outer coating cup temperature increases to higher limit and external coating diameter and is still less than desired value, setting outer coating cup temperature is higher limit, and improves outer painting pressure with certain step-length voltage regulating, and step-length voltage regulating of every increase all needs to wait for certain constant voltage interval; In the time that outer painting pressure is brought up to higher limit and external coating diameter and is still less than desired value, setting outer coating cup temperature is that higher limit, outer painting pressure are higher limit, and increase outer coating material temperature degree with certain material temperature step-length, material temperature step-length of every increase all needs to wait for certain control interval, further increase external coating diameter, to reach desired value.
7. in a kind of drawing process according to claim 1, apply the method for the on-line automatic control of diameter, it is characterized in that, when described external coating diameter is greater than desired value, gradually reduce outer coating cup temperature with certain temperature adjustment step-length, temperature adjustment step-length of every minimizing all needs to wait for certain constant temperature interval; In the time that outer coating cup temperature reduces to lower limit and external coating diameter and is still greater than desired value, setting outer coating cup temperature is lower limit, and progressively reduces outer painting pressure with certain step-length voltage regulating, and often reducing a step-length voltage regulating all needs to wait for certain constant voltage interval; In the time that outer painting pressure is reduced to lower limit and external coating diameter and is still greater than desired value, setting outer coating cup temperature is that lower limit, outer painting pressure are lower limit, and progressively reduce outer coating material temperature degree with certain material temperature step-length, often reduce a material temperature step-length and all need to wait for certain control interval, further reduce external coating diameter, to reach desired value.
8. according to the method that applies the on-line automatic control of diameter in a kind of drawing process described in claim 6 or 7, it is characterized in that, described temperature adjustment step-length is 0.5～1 ℃; Step-length voltage regulating is 0.1～0.6bar; Described material temperature step-length is 0.3～0.8 ℃.
9. according to the method that applies the on-line automatic control of diameter in a kind of drawing process described in claim 6 or 7, it is characterized in that, described constant temperature is spaced apart 2min; Constant voltage is spaced apart 30s; Control interval is 1min.
10. in a drawing process, apply the on-line automatic control device of diameter, comprise successively fiber drawing furnace, cooling tube, interior coating cup, outer coating cup, UV lamp and stretching pulley, take-up reel, it is characterized in that, described cooling tube outlet arranges bare fibre caliper, overlay diameter caliper is set between described UV lamp and stretching pulley, described overlay diameter caliper is connected with PLC signal input part, and PLC signal output part is connected with cooling tube, interior coating cup, outer coating cup respectively.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410038630.8A CN103809618B (en) | 2014-01-27 | 2014-01-27 | A kind of drawing process applies method and the device thereof of the on-line automatic control of diameter |
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| CN201410038630.8A CN103809618B (en) | 2014-01-27 | 2014-01-27 | A kind of drawing process applies method and the device thereof of the on-line automatic control of diameter |
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| CN103809618B (en) | 2016-12-07 |
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