CN112624599A - Control device and control method for uniform density of multi-deposition blowtorch - Google Patents

Control device and control method for uniform density of multi-deposition blowtorch Download PDF

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Publication number
CN112624599A
CN112624599A CN202011415032.XA CN202011415032A CN112624599A CN 112624599 A CN112624599 A CN 112624599A CN 202011415032 A CN202011415032 A CN 202011415032A CN 112624599 A CN112624599 A CN 112624599A
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target rod
temperature
fuel
infrared thermometer
guide rail
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雍小丁
相杉杉
姜丁允
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Hengtong Optic Electric Co Ltd
Jiangsu Hengtong Photoconductive New Materials Co Ltd
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Hengtong Optic Electric Co Ltd
Jiangsu Hengtong Photoconductive New Materials Co Ltd
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    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
    • C03B37/00—Manufacture or treatment of flakes, fibres, or filaments from softened glass, minerals, or slags
    • C03B37/01—Manufacture of glass fibres or filaments
    • C03B37/012—Manufacture of preforms for drawing fibres or filaments
    • C03B37/014—Manufacture of preforms for drawing fibres or filaments made entirely or partially by chemical means, e.g. vapour phase deposition of bulk porous glass either by outside vapour deposition [OVD], or by outside vapour phase oxidation [OVPO] or by vapour axial deposition [VAD]
    • C03B37/01413—Reactant delivery systems
    • C03B37/0142—Reactant deposition burners
    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
    • G05D7/00—Control of flow
    • G05D7/06—Control of flow characterised by the use of electric means
    • G05D7/0617—Control of flow characterised by the use of electric means specially adapted for fluid materials
    • G05D7/0629—Control of flow characterised by the use of electric means specially adapted for fluid materials characterised by the type of regulator means
    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
    • C03B2207/00—Glass deposition burners
    • C03B2207/50—Multiple burner arrangements
    • C03B2207/52—Linear array of like burners
    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
    • C03B2207/00—Glass deposition burners
    • C03B2207/70—Control measures

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  • Chemical & Material Sciences (AREA)
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  • Automation & Control Theory (AREA)
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  • Materials Engineering (AREA)
  • Organic Chemistry (AREA)
  • Manufacture, Treatment Of Glass Fibers (AREA)

Abstract

The invention relates to a control device and a control method for uniform density of multiple deposition blowlamps, wherein two adjacent sides of a target rod are respectively provided with a guide rail and a plurality of blowlamps which are vertically arranged, an infrared thermometer is fixed on a stable platform and vertically reciprocates along the guide rail, the infrared thermometer is connected with a controller and then is connected with a computer host, the infrared thermometer carries out periodic temperature test on the surface of each stage of the target rod, silicon dioxide powder is produced by combustion reaction of organic silicon and fuel of the blowlamps, the silicon dioxide powder is deposited on the target rod through thermophoresis to form a loose body, the blowlamps are connected with a fuel flow meter, and the controller adjusts the actual output fuel quantity on the corresponding blowlamps through the fuel flow meter. According to the control device and the control method for the uniform density of the multi-deposition blowtorch, provided by the invention, the surface temperature of the target rod is monitored by utilizing infrared temperature measurement, and the required flow of fuel is regulated and controlled, so that the surface temperature of the obtained loose body is uniform, and the optical fiber preform rod with uniform density, uniform stress distribution and improved dehydration performance and attenuation performance of a product is prepared.

Description

Control device and control method for uniform density of multi-deposition blowtorch
Technical Field
The invention belongs to the technical field of preparation of optical fiber preform target rods, and particularly relates to a control device and a control method for uniform density of a multi-deposition burner.
Background
In the prior art for manufacturing an optical fiber preform, a two-step total synthesis process is mainly adopted: preparing an optical fiber preform core rod by VAD (vapor axial deposition), taking the core rod as a target rod, and depositing an outer cladding layer by OVD (outside vapor deposition). For the preparation of the outer cladding, organic silicon is gradually used to replace the conventional SiCl4Is a silicon source, and is an environment-friendly raw material because the organosilicon reaction process does not contain pollutants harmful to the environment, such as halogen and the like. Production of large quantities of SiO by combustion of organosilicon during deposition2And (2) depositing the dust particles on the target rod layer by layer under the thermophoresis effect, obtaining a silicon dioxide dust precursor (or called loose body) after the deposition is finished, and sintering and vitrifying the precursor to obtain the optical fiber preform. In the deposition process, if the powder particle size and distribution of the loose body are more uniform, the optical fiber perform rod with better quality can be obtained.
However, during the production process, combustion of the fuel gas and the silicon source releases a large amount of heat, and in particular, the organic silicon emits more heat. At present, a plurality of blowlamps are commonly adopted for deposition, flowmeters with the same specification are used for metering raw materials and fuel gas, but the differences existing between the flowmeters and the differences existing in the machining precision of pipelines and the blowlamps cannot ensure the consistency between the blowlamps, so that the uniformity of products is reduced. The principle of vapor deposition of bulk is, in essence, deposition by means of the thermophoretic effect (a gas-solid or gas-liquid dispersion of solid or liquid particles suspended in a gaseous medium is referred to collectively as an aerosol; when the aerosol is in a non-isothermal field, microparticles suspended in a gaseous medium are moved by a force directed against a temperature gradient, a phenomenon known as thermophoresis
Figure BDA0002819886920000011
). According to the heat convection principle, the temperature rises along with the burning in the deposition process, the bulk is enlarged, the heat upwells, the temperature deviation about appearing, the difference in this kind of temperature causes different position thermophoresis speed difference (deposition rate is different promptly), need regulate and control the homogeneity in order to guarantee the loose external diameter to gas, raw materials in the deposition process, and then can lead to there being very big difference in inside substantial density under the same circumstances of loose external diameter. The temperature deviation on the target rod is more remarkable under the superposition of heat released by a plurality of torches. Figure 1 shows the temperature of the rod at various points in the bulk at a stage. Because the loose body is a porous structure, the density is generally 0.2-0.8 g/cm3During the oxidation sintering, densification and vitrification are needed; if the density is not uniform, the outer diameter of the optical rod is not uniform, and the small density area corresponds to a larger gap, so that the optical rod is thinner after vitrification. In addition, lattice defects are caused even by different stress among particles, bubbles in a loose body in a low-density area are easy to discharge, the discharge time of bubbles in a high-density area is relatively long, the conditions of incomplete air hole elimination, poor transparentization and the like in a high-density area can be caused, and the drawing quality of the optical rod can be influenced. FIG. 2 shows the difference between the curves of the outer diameter of the loose body and the outer diameter of the sintered optical rod. The uniformity of the final outer diameter of the loose body is ensured mainly through the control of a diameter measuring system, but the uniformity of the internal structure of the loose body cannot be ensured.
In order to better control the quality of products, it is necessary to develop a method capable of monitoring and controlling the surface temperature of the loose body in the deposition process on line, so as to control the overall density uniformity of the loose body from beginning to end and obtain an optical fiber preform product with excellent quality.
Disclosure of Invention
In order to solve the technical problems in the prior art, the invention aims to provide a control device and a control method for controlling the density uniformity of a multi-deposition burner.
In order to achieve the purpose and achieve the technical effect, the invention adopts the technical scheme that:
the utility model provides a controlling means that many deposits blowtorch density is even, including target bar, motor, infrared thermometer, guide rail, controller, computer, fuel flow meter and blowtorch, the target bar vertical layout is in the assigned position of deposition area, the both sides that the target bar is adjacent set up guide rail and a plurality of vertical blowtorch of arranging respectively, set up the infrared thermometer along the vertical reciprocating motion of guide rail on the guide rail, carry out periodic temperature test to the target bar surface through infrared thermometer, infrared thermometer is connected with the controller and is reconnected the computer, the organosilicon of blowtorch and the burning reaction of fuel produce silica powder, deposit on the target bar through thermophoresis, form the loose body of optical fiber perform, the controller is connected with fuel flow meter and is reconnected the blowtorch, the actual output fuel volume on the controller passes through fuel flow meter adjustment blowtorch.
Further, a plurality of blowtorch is arranged to the right side vertical equidistant of target rod, and every blowtorch all is connected to the controller with a fuel flowmeter again, and the controller chooses for use current PLC, singlechip etc. can.
Furthermore, a vertically-arranged guide rail is arranged on the right rear side of the target rod, a motor and a stabilizing platform are arranged on the guide rail, the motor is connected with the stabilizing platform horizontally arranged on the guide rail, an infrared thermometer is arranged on the stabilizing platform, and the stabilizing platform is driven by the motor to drive the infrared thermometer on the stabilizing platform to reciprocate vertically along the guide rail, so that the periodic temperature detection is conveniently carried out on the surface of the target rod.
Further, the horizontal distance between the infrared thermometer and the target rod is 50-100 cm.
Further, still include anchor clamps, rotating electrical machines and elevator motor, anchor clamps include anchor clamps and lower anchor clamps, go up anchor clamps and lower anchor clamps press from both sides tight target rod top and bottom respectively and make the target rod vertically fasten in the assigned position of deposition area again, upper and lower anchor clamps adopt current product can, only need to ensure to clip target rod and vertical firm position, rotating electrical machines and elevator motor set up respectively in the assigned position of deposition area, and rotating electrical machines's rotation axis and target rod coaxial coupling carry out 360 rotary motion of axial through rotating electrical machines control target rod, and elevator motor sets up on the lift guide rail of the assigned position of deposition area, lift motor main shaft and target rod coaxial coupling, and elevator motor drives the synchronous lift of target rod along the vertical elevating movement of lift guide rail, realizes even deposit.
The invention discloses a method for controlling the density uniformity of a multi-deposition blast burner, which utilizes infrared temperature measurement to control the temperature balance and the density uniformity of each stage in the preparation process of an optical fiber preform loose body and comprises the following steps:
during deposition production, silicon dioxide powder is produced through combustion reaction of organic silicon and fuel of a blast lamp and is deposited on a target rod through thermophoresis, an infrared thermometer vertically reciprocates along a guide rail on the front side and the rear side of the target rod corresponding to the blast lamp, periodic temperature tests are conducted on the surface of each stage of the target rod, the real-time temperature of the surface of the target rod corresponding to each blast lamp position is recorded and is uploaded to a controller for analysis processing, the integral average temperature value of the surface of the target rod at the moment and the temperature deviation of the integral average temperature value and each measuring point are calculated, the fuel demand flow of each blast lamp is calculated and fed back to a computer host, the controller adjusts the actual fuel flow of the corresponding blast lamp through a fuel flow meter to increase or decrease, and infrared temperature measurement and fuel heat adjustment are conducted on the target rod every other temperature test cycle until deposition is finished.
Further, the infrared thermometer carries out periodic temperature test on the surface of each stage of the target rod, and records the real-time firework temperature T corresponding to the surface of the target rod at each blowtorch position1、T2、T3……TnAnd uploading the temperature data to a controller for analysis and processing, and respectively calculating the integral average temperature value of the surface of the target rod at the moment and the temperature deviation between the integral average temperature value and each measuring point through a formula (1) and a formula (2):
Taverage＝(T1+T2+……Tn) Formula/n (1)
△Tn＝Tn-TAverageFormula (2)
Wherein, TnMeasured temperature, T, for the nth torch corresponding to the position of the target barAverageIs the integral average temperature value of the surface of the target rod at a certain time, and Delta Tn is the nth temperature detection point and T at a certain timeAverageTemperature deviation of (2);
if delta Tn is greater than 0, the surface temperature of the corresponding target rod at the position is relatively high, the controller controls the fuel flow of the blowtorch at the position to be reduced, if delta Tn is less than 0, the surface temperature of the target rod at the position is relatively low, and the controller controls the fuel flow of the blowtorch at the position to be increased.
Further, the fuel demand flow rate is determined by equation (3):
C＝m×C0formula (3)
Wherein C is the adjusted fuel demand flow, C0M is the flow conversion coefficient corresponding to different delta Tn for the initial air flow, and when the delta Tn is 0, m is 0, 0<Δ Tn, 0<m<1，△Tn<At 0, 1<m<1.2。
Further, the moving speed of the infrared thermometer is 1-5 m/s, and the temperature testing cycle period of the infrared thermometer is 10-30 min.
Compared with the prior art, the invention has the beneficial effects that:
the invention discloses a control device and a control method for uniform density of multiple deposition blowlamps, the control device comprises a target rod, a motor, an infrared thermometer, a guide rail, a controller, a computer host, a fuel flowmeter and blowlamps, the target rod is vertically arranged at a designated position of a deposition area, the guide rail and a plurality of blowlamps which are vertically arranged are respectively arranged at two adjacent sides of the target rod, the infrared thermometer which vertically reciprocates along the guide rail is arranged on the guide rail, the surface of the target rod is periodically tested for temperature by an infrared thermometer, the infrared thermometer is connected with a controller and then connected with a computer host, the organosilicon of the blowtorch and fuel are reacted by combustion to produce silicon dioxide powder, the method comprises the steps of depositing on a target rod through thermophoresis to form an optical fiber preform loose body, connecting a controller with a fuel flow meter, connecting a blowtorch, connecting one fuel flow meter with one blowtorch, and adjusting the actual output fuel quantity on the corresponding blowtorch through the fuel flow meter by the controller. According to the control device and the control method for the density uniformity of the multi-deposition blowtorch, the integral temperature of the surface of the whole optical fiber preform or the precursor in the deposition process is monitored in real time by utilizing infrared temperature measurement, and the fuel demand flow is regulated and controlled according to the demand, so that the surface temperature of each stage of the loose body is horizontal, and the optical fiber preform with uniform density, uniform stress distribution, improved dehydration performance and attenuation characteristic of the product, better optical parameters and uniform performance is prepared.
Drawings
FIG. 1 is a graph of the temperature profile of a prior art rod at various points in a bulk body at a stage;
FIG. 2 is a graph showing the difference between curves of the outer diameter of the porous body and the outer diameter of the sintered optical rod in the prior art;
FIG. 3 is a schematic structural view of the present invention;
wherein, 1, a motor; 2-an infrared thermometer; 3-a stabilization platform; 4-a guide rail; 5-a target rod; 6-a controller; 7-a computer host; 8-a fuel flow meter; 9-a blast lamp; 10-lower clamp; 11-upper clamp; 12-a rotating electrical machine; 13-a lifting motor; 14-lifting guide rails.
Detailed Description
The following detailed description of the embodiments of the present invention is provided to enable those skilled in the art to more easily understand the advantages and features of the present invention, and to clearly and clearly define the scope of the present invention.
As shown in figure 3, a control device that many deposits blowtorch density is even, including motor 1, infrared thermometer 2, stable platform 3, guide rail 4, target 5, controller 6, computer 7, fuel flowmeter 8, blowtorch 9, anchor clamps, rotating electrical machines 12, elevator motor 13 and lift guide rail 14, 5 one side (right side) of target sets up blowtorch 9, blowtorch 9 is equipped with a plurality of and from top to bottom vertical equidistant arranging, a blowtorch 9 corresponds and connects a fuel flowmeter 8, different blowtorches 9 can realize different flow regulation and control, when carrying out production, the organosilicon of blowtorch 9 and the burning reaction of fuel produce silica powder, deposit on target 5 through thermophoresis, the adjacent opposite side (right back side) of target 5 sets up a guide rail 4 of vertical arranging, the level setting is followed the guide rail 4 and is gone up to guide rail 4A stabilizing platform 3 with a rail 4 sliding in a vertical reciprocating manner, a motor 1 connected with the stabilizing platform 3, an infrared thermometer 2 fixed on the working platform 3, the working platform 3 driven by the motor 1 to drive the infrared thermometer 2 thereon to reciprocate vertically along the rail 4, when the infrared thermometer 2 reciprocates vertically, periodic temperature detection can be carried out on each point on the surface of a target rod 5, the position of the infrared temperature measurement point on the target rod 5 and the movement rate of the infrared thermometer 2 are controlled by the motor 1 and correspond to the target rod 5 and a blowtorch 9, each position of the infrared temperature measurement point corresponds to a blowtorch 9, the infrared thermometer 2 is connected with the input end of a controller 6, the output end of the controller 6 is connected with a computer host 7 and all fuel flowmeters 8, the infrared thermometer 2 transmits the infrared temperature measurement data of each position of the infrared temperature measurement point detected in real time to the controller 6, the controller 6 receives and processes and analyzes the data to obtain the temperature T of each part on the surface of the target rod 5nOverall temperature level and temperature mean value TAverageObtaining the infrared temperature measurement data and the temperature average value T of each infrared temperature measurement point positionAverageThe temperature difference delta Tn between the target rods is compared with the corresponding blowtorch 9, the fuel demand flow C is calculated by PID and fed back to the computer host 7, the actual output fuel flow of the corresponding blowtorch 9 is adjusted by the controller 6 through the fuel flow Meter (MFC)8, so that the flow regulation of each blowtorch 9 is realized, the infrared temperature measurement and the fuel quantity adjustment are carried out on the target rods 5 at certain intervals until the deposition is finished, and the surface temperature of the target rods 5 is always balanced and the deposition density is uniform.
The anchor clamps include anchor clamps 10 and last anchor clamps 11 down, through anchor clamps 10 and last anchor clamps 11 respectively with target 5 bottom and top clamp tightly and make target 5 vertical place in the assigned position in deposition area, rotating electrical machines 12 and elevator motor 13 set up respectively in the assigned position in deposition area, the rotation axis of rotating electrical machines 12 is connected and both axis is on same straight line with target 5, it is rotatory 360 to drive target 5 axial through rotating electrical machines 12, elevator motor 13 is connected and control target 5 and carry out vertical elevating movement with target 5, elevator motor 13 sets up on elevator guide rail 14 of the assigned position in deposition area, elevator motor 13 main shaft and target 5 coaxial coupling, elevator motor 13 is along elevator guide rail 14 vertical elevating movement, target 5 synchronous elevating movement, realize even deposit.
The vertical moving speed of the infrared thermometer 2 is represented by v, and the value range of v is 1-5 m/s, preferably 2-3 m/s; the temperature testing cycle period of the infrared thermometer 2 is 10-30 min; the transverse distance between the infrared thermometer 2 and the target rod 5 is 50-100 cm.
A control method for the density uniformity of a multi-deposition blast burner utilizes infrared temperature measurement to control the temperature balance and the density uniformity of each stage in the preparation process of an optical fiber preform loose body; during deposition production, the infrared thermometer 2 vertically reciprocates along the guide rail 4 at a certain moving speed at the front side and the rear side of the target rod 5 corresponding to the blowlamps 9, the temperature of the surface of each stage of the target rod 5 is tested, and the real-time temperature T of the surface of the target rod 5 corresponding to the position of each blowlamp 9 is recorded1、T2、T3……Tn(ii) a Calculating the integral average temperature value T of the surface of the target rod 5 at the moment by the formula (1)Average：
TAverage＝(T1+T2+……Tn)/n (1)
Calculating each measuring point and T by using the formula (2)AverageTemperature deviation DeltaT of1、△T2、△T3……：
△Tn＝Tn-TAverage (2)
If Δ Tn >0, it indicates that the surface temperature of the corresponding target rod 5 is relatively high, the controller 6 controls the flow rate of the fuel of the torch 9 at that position to be reduced to a certain extent, and if Δ Tn < 0, it indicates that the temperature of the target rod 5 at that position is relatively low, and the controller 6 controls the flow rate of the fuel of the torch 9 at that position to be increased to a certain extent.
The PID lift gas flow rate is calculated by equation (3):
C＝m×C0 (3)
wherein n is the number of torches, TnThe measured temperature, T, of the nth torch 9 corresponding to the position of the target 5AverageIs the integral average temperature value of the surface of the target rod 5 at a certain time, and Delta Tn is the nth temperature detection point and T at a certain timeAverageTemperature deviation of (2); c is the PID adjusted fuel demand flow, C0M is the flow conversion coefficient corresponding to different DeltaTn obtained according to the experimental result, and when DeltaTn is 0, m is 0, 0<Δ Tn, 0<m<1，△Tn<At 0, 1<m<1.2。
Example 1
As shown in figure 3, a control device for controlling the density uniformity of a multi-deposition blowtorch comprises a motor 1, an infrared thermometer 2, a stable platform 3, a guide rail 4, a target rod 5, a controller 6, a computer host 7, a fuel flowmeter 8, a blowtorch 9, a lower clamp 10, an upper clamp 11, a rotating motor 12, a lifting motor 13 and a lifting guide rail 14, wherein the bottom and the top of the target rod 5 are respectively clamped and vertically placed at the designated position of a deposition area through the lower clamp 10 and the upper clamp 11, the lower clamp 10 and the upper clamp 11 can be directly sleeved on the surface of the target rod 5 and fastened at the vertical position, the existing product is adopted, the rotating shaft of the rotating motor 12 is connected with the target rod 5, the central axes of the rotating shaft and the target rod 5 are on the same straight line, the target rod 5 is driven to rotate through the rotating motor 12, the lifting motor 13 is arranged on the lifting guide rail 14 at the designated position of the deposition area, the lifting motor 13 vertically lifts along the lifting guide rail 14, the target rods 5 synchronously lift to realize uniform deposition, the prior art is adopted, the blowlamps 9 are arranged right on the target rods 5, the blowlamps 9 are provided with four blowlamps which are vertically arranged from top to bottom at equal intervals, one blowlamp 9 is correspondingly connected with one fuel flowmeter 8, different blowlamps 9 can realize different flow regulation, when in production, the silicon dioxide powder is produced by the combustion reaction of organic silicon and fuel of the blowlamps 9 and deposited on the target rods 5 through thermophoresis, the guide rail 4 which is vertically arranged is arranged right behind the target rods 5, the stabilizing platform 3 which vertically reciprocates along the guide rail 4 is horizontally arranged on the guide rail 4, the motor 1 is connected with the stabilizing platform 3, the infrared thermometer 2 is fixed on the working platform 3, the working platform 3 is driven by the motor 1 to drive the infrared thermometer 2 on the working platform to vertically reciprocate along the guide rail 4, the periodic temperature detection of the firework temperature of each point can be carried out on the target rod 5 when the infrared thermometer 2 vertically reciprocates, the position of the infrared temperature measuring point on the target rod 5 and the movement rate of the infrared thermometer 2 are controlled by the motor 1 and are opposite to the target rod 5 and the blowtorch 9It should, every infrared temperature measurement point position corresponds with a blowtorch 9 position respectively, the temperature of infrared temperature measurement point position department matches with the temperature that the blowtorch 9 that corresponds spun, infrared thermometer 2 is connected with controller 6 input, controller 6 output is connected with computer 7 and all fuel flowmeter 8, infrared thermometer 2 transmits the infrared temperature measurement data of each infrared temperature measurement point position of real-time detection to controller 6, controller 6 receives and carries out data processing and analysis, acquire temperature T everywhere on target rod 5 surfacenOverall temperature level and temperature mean value TAverageObtaining the infrared temperature measurement data and the temperature average value T of each infrared temperature measurement point positionAverageThe temperature difference value delta Tn is compared with the blowtorch 9 at the corresponding position, the fuel demand flow C is calculated by using PID and fed back to the computer host 7, the controller 6 adjusts the actual output fuel quantity of the blowtorch 9 corresponding to the controller through the fuel flowmeter 8, thereby realizing the flow regulation of each blowtorch 9, and the infrared temperature measurement and the fuel quantity adjustment are carried out on the target rod 5 at certain intervals until the deposition is finished.
The infrared thermometer 2 moves from top to bottom at a speed of 2m/s on the guide rail 4 under the driving action of the motor 1, records infrared temperature measurement data of each infrared temperature measurement point position corresponding to the four blowlamps 9 respectively, transmits the infrared temperature measurement data to the controller 6 for data analysis and processing, the temperature test cycle period of the infrared thermometer 2 is 15min, the transverse (horizontal) distance between the infrared thermometer 2 and the target rod 5 is 80cm, and flow conversion coefficients m corresponding to different temperature difference values delta Tn are obtained through PID according to experiments, as shown in Table 1.
TABLE 1
Figure BDA0002819886920000071
The infrared thermometer 2 moves back and forth along the guide rail 4 vertically to test the temperature of the surface of the target rod 5 at each stage and record the real-time temperature T of the surface of the target rod 5 corresponding to the position of each blowtorch 91、T2、T3……Tn(ii) a Calculating the integral average temperature value T of the surface of the target rod 5 at the moment by the formula (1)Average：
TAverage＝(T1+T2+……Tn)/n (1)
Calculating each measuring point and T by using the formula (2)AverageTemperature deviation DeltaT of1、△T2、△T3……：
△Tn＝Tn-TAverage (2)
If Δ Tn >0, it indicates that the surface temperature of the corresponding target rod 5 is relatively high, the controller 6 controls the flow rate of the fuel of the torch 9 at that position to be reduced to a certain extent, and if Δ Tn < 0, it indicates that the temperature of the target rod 5 at that position is relatively low, and the controller 6 controls the flow rate of the fuel of the torch 9 at that position to be increased to a certain extent.
The PID lift gas flow rate is calculated by equation (3):
C＝m×C0 (3)
wherein n is the number of torches, TnThe measured temperature, T, of the nth torch 9 corresponding to the position of the target 5AverageIs the integral average temperature value of the surface of the target rod 5 at a certain time, and Delta Tn is the nth temperature detection point and T at a certain timeAverageTemperature deviation of (2); c is the PID adjusted fuel demand flow, C0M is the flow conversion coefficient corresponding to different DeltaTn obtained according to the experimental result
The required fuel flow C is calculated according to the formula (3), the required fuel flow C is fed back to the computer host 7, the fuel flow which is sprayed out by the corresponding blowtorch 9 is adjusted by controlling the fuel flow meter 8 through the controller 6, and the adjustment is carried out once every 15min until the deposition is finished.
The parts of the invention not specifically described can be realized by adopting the prior art or the prior products, and are not described in detail herein.
The above description is only an embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes performed by the present specification and drawings, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.

Claims (9)

1. The control device is characterized by comprising a target rod, a motor, an infrared thermometer, a guide rail, a controller, a computer host, a fuel flow meter and a blast lamp, wherein the target rod is vertically arranged at a designated position of a deposition area, the guide rail and a plurality of blast lamps which are vertically arranged are respectively arranged on two adjacent sides of the target rod, the infrared thermometer which vertically reciprocates along the guide rail is arranged on the guide rail, the surface of the target rod is subjected to periodic temperature test through the infrared thermometer, the infrared thermometer is connected with the controller and then connected with the computer host, silicon dioxide powder is produced through combustion reaction of organic silicon and the fuel of the blast lamp, the silicon dioxide powder is deposited on the target rod through thermophoresis to form an optical fiber preform loose body, the controller is connected with the fuel flow meter and then connected with the blast lamp, and the controller adjusts the actual output fuel quantity on the blast lamp through the fuel flow meter.
2. The device for controlling the uniformity of density of multiple deposition torches as claimed in claim 1, wherein a plurality of torches are vertically arranged at equal intervals right from the target rod, and each torch is connected to a fuel flow meter.
3. The device according to claim 1, wherein a vertically disposed guide rail is disposed right behind the target rod, the guide rail is provided with a motor and a stabilizing platform, the motor is connected with the horizontally disposed stabilizing platform, the stabilizing platform is provided with an infrared thermometer, and the motor drives the stabilizing platform to drive the infrared thermometer thereon to reciprocate vertically along the guide rail.
4. The apparatus according to claim 1, wherein the horizontal distance between the infrared thermometer and the target rod is 50-100 cm.
5. The apparatus of claim 1, further comprising a clamp, a rotating motor and a lifting motor, wherein the target rod is vertically fastened to a designated position of the deposition area by the clamp, and the rotating motor and the lifting motor are respectively connected to the target rod and respectively control the target rod to perform axial rotation and vertical lifting motion.
6. A control method of a control device for controlling density uniformity of a multi-deposition burner according to any one of claims 1 to 5, wherein temperature equalization and density uniformity at each stage in the preparation process of the optical fiber preform soot body are controlled by infrared temperature measurement, comprising the steps of:
during deposition production, silicon dioxide powder is produced through combustion reaction of organic silicon and fuel of a blast lamp and is deposited on a target rod through thermophoresis, an infrared thermometer vertically reciprocates along a guide rail on the front side and the rear side of the target rod corresponding to the blast lamp, periodic temperature tests are conducted on the surface of each stage of the target rod, the real-time temperature of the surface of the target rod corresponding to each blast lamp position is recorded and is uploaded to a controller for analysis processing, the integral average temperature value of the surface of the target rod at the moment and the temperature deviation of the integral average temperature value and each measuring point are calculated, the fuel demand flow of each blast lamp is calculated and fed back to a computer host, the controller adjusts the actual fuel flow of the corresponding blast lamp through a fuel flow meter to increase or decrease, and infrared temperature measurement and fuel heat adjustment are conducted on the target rod every other temperature test cycle until deposition is finished.
7. The method as claimed in claim 6, wherein the infrared thermometer periodically measures the temperature of the target rod surface at each stage, and records the real-time temperature T of the target rod surface at each torch position1、T2、T3……TnAnd uploading the temperature data to a controller for analysis and processing, and respectively calculating the integral average temperature value of the surface of the target rod at the moment and the temperature deviation between the integral average temperature value and each measuring point through a formula (1) and a formula (2):
Taverage＝(T1+T2+……Tn) Formula/n (1)
△Tn＝Tn-TAverage Formula (2)
Wherein, TnMeasured temperature, T, for the nth torch corresponding to the position of the target barAverageIs the integral average temperature value of the surface of the target rod at a certain time, and Delta Tn is the nth temperature detection point and T at a certain timeAverageTemperature deviation of (2);
if delta Tn is greater than 0, the surface temperature of the corresponding target rod at the position is relatively high, the controller controls the fuel flow of the blowtorch at the position to be reduced, if delta Tn is less than 0, the surface temperature of the target rod at the position is relatively low, and the controller controls the fuel flow of the blowtorch at the position to be increased.
8. The control method of a control apparatus for a multiple deposition burner with uniform density according to claim 6, wherein the fuel demand flow rate is determined by equation (3):
C＝m×C0formula (3)
Wherein C is the adjusted fuel demand flow, C0M is the flow conversion coefficient corresponding to different delta Tn for the initial air flow, and when the delta Tn is 0, m is 0, 0<Δ Tn, 0<m<1，△Tn<At 0, 1<m<1.2。
9. The method for controlling a device for controlling density uniformity of a multi-deposition burner according to claim 6, wherein the moving speed of the infrared thermometer is 1 to 5m/s, and the temperature test cycle period of the infrared thermometer is 10 to 30 min.
CN202011415032.XA 2020-12-07 2020-12-07 Control device and control method for uniform density of multi-deposition blowtorch Pending CN112624599A (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113716860A (en) * 2021-09-15 2021-11-30 杭州金星通光纤科技有限公司 Device and method for depositing optical fiber preform by longitudinal OVD (optical vapor deposition) process
CN113772946A (en) * 2021-10-22 2021-12-10 江苏亨通光导新材料有限公司 Structure and method for preventing cone head of optical fiber preform from cracking and storage medium
CN113772947A (en) * 2021-09-17 2021-12-10 杭州金星通光纤科技有限公司 System and method for controlling density of loose body of optical fiber preform rod in production process

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113716860A (en) * 2021-09-15 2021-11-30 杭州金星通光纤科技有限公司 Device and method for depositing optical fiber preform by longitudinal OVD (optical vapor deposition) process
CN113772947A (en) * 2021-09-17 2021-12-10 杭州金星通光纤科技有限公司 System and method for controlling density of loose body of optical fiber preform rod in production process
CN113772946A (en) * 2021-10-22 2021-12-10 江苏亨通光导新材料有限公司 Structure and method for preventing cone head of optical fiber preform from cracking and storage medium

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