CN109407109B - Device for monitoring sintering length of VAD loose body and monitoring method thereof - Google Patents
Device for monitoring sintering length of VAD loose body and monitoring method thereof Download PDFInfo
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- CN109407109B CN109407109B CN201811620749.0A CN201811620749A CN109407109B CN 109407109 B CN109407109 B CN 109407109B CN 201811620749 A CN201811620749 A CN 201811620749A CN 109407109 B CN109407109 B CN 109407109B
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- 238000005245 sintering Methods 0.000 title claims abstract description 88
- 238000012544 monitoring process Methods 0.000 title claims abstract description 44
- 238000000034 method Methods 0.000 title claims description 22
- 230000000007 visual effect Effects 0.000 claims abstract description 12
- 238000012552 review Methods 0.000 claims abstract description 5
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 34
- 239000010453 quartz Substances 0.000 claims description 33
- 230000000149 penetrating effect Effects 0.000 claims description 26
- 230000008021 deposition Effects 0.000 claims description 6
- 239000002184 metal Substances 0.000 claims description 3
- 238000004017 vitrification Methods 0.000 abstract description 6
- 230000018044 dehydration Effects 0.000 abstract description 5
- 238000006297 dehydration reaction Methods 0.000 abstract description 5
- 238000005906 dihydroxylation reaction Methods 0.000 abstract description 3
- 235000012239 silicon dioxide Nutrition 0.000 description 26
- 239000013307 optical fiber Substances 0.000 description 24
- 238000004519 manufacturing process Methods 0.000 description 6
- 238000000151 deposition Methods 0.000 description 5
- 238000012681 fiber drawing Methods 0.000 description 4
- 238000012806 monitoring device Methods 0.000 description 4
- 230000003287 optical effect Effects 0.000 description 4
- 230000035515 penetration Effects 0.000 description 4
- 238000012797 qualification Methods 0.000 description 3
- 230000002159 abnormal effect Effects 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000006978 adaptation Effects 0.000 description 1
- 239000012080 ambient air Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005229 chemical vapour deposition Methods 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000003111 delayed effect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
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- 238000002360 preparation method Methods 0.000 description 1
- 230000000246 remedial effect Effects 0.000 description 1
- 230000035939 shock Effects 0.000 description 1
- 238000001089 thermophoresis Methods 0.000 description 1
- 238000007740 vapor deposition Methods 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S17/00—Systems using the reflection or reradiation of electromagnetic waves other than radio waves, e.g. lidar systems
- G01S17/02—Systems using the reflection of electromagnetic waves other than radio waves
- G01S17/06—Systems determining position data of a target
- G01S17/08—Systems determining position data of a target for measuring distance only
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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]
- C03B37/01446—Thermal after-treatment of preforms, e.g. dehydrating, consolidating, sintering
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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]
- C03B37/01446—Thermal after-treatment of preforms, e.g. dehydrating, consolidating, sintering
- C03B37/0146—Furnaces therefor, e.g. muffle tubes, furnace linings
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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]
- C03B37/018—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] by glass deposition on a glass substrate, e.g. by inside-, modified-, plasma-, or plasma modified- chemical vapour deposition [ICVD, MCVD, PCVD, PMCVD], i.e. by thin layer coating on the inside or outside of a glass tube or on a glass rod
- C03B37/01853—Thermal after-treatment of preforms, e.g. dehydrating, consolidating, sintering
-
- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B19/00—Programme-control systems
- G05B19/02—Programme-control systems electric
- G05B19/04—Programme control other than numerical control, i.e. in sequence controllers or logic controllers
- G05B19/05—Programmable logic controllers, e.g. simulating logic interconnections of signals according to ladder diagrams or function charts
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Abstract
The utility model discloses a device for monitoring sintering length of a VAD loose body, wherein a lifting platform can move up and down along a tower guide rail, the VAD loose body is vertically hung on the lifting platform through a guide rod, a sintering furnace is placed under the VAD loose body, a laser emitter and a laser receiver are respectively arranged at two sides of a furnace mouth of the sintering furnace, which is L1 in height, the laser emitter and the laser receiver are respectively connected with a control system, the laser range finder emitter is arranged at the same height position outside the laser emitter, the laser range finder receiver arranged at the bottom of the lifting platform right above the laser emitter is connected with the control system through a signal amplifier and a range sensor, and a PLC control module is arranged in the control system. According to the utility model, the audible and visual alarm of the PLC control module can remind an operator to review and correct the estimated sintering length of the input VAD loose body, so that the situations of incomplete or excessive dehydroxylation, dehydration and vitrification degree of the VAD loose body are avoided, the sintering efficiency of the VAD loose body is improved, and the safety of equipment such as a furnace core pipe is ensured.
Description
Technical Field
The utility model belongs to the technical field of manufacturing of optical fiber preforms, and particularly relates to a device for monitoring the sintering length of a VAD loose body and a monitoring method thereof.
Background
In the manufacturing process of the optical fiber preform mother rod, an optical fiber preform core rod and an optical fiber preform are respectively manufactured by a 'VAD (axial vapor deposition method) +OVD (outside rod chemical vapor deposition method)', wherein the VAD method utilizes a thermophoresis principle to deposit and attach silicon dioxide powder on the surface of a rotating quartz target rod, and finally a VAD loose body is manufactured, the deposition length of the VAD loose body is not fixed, the general length is 300-2000 mm, and the sintering efficiency of the VAD loose body, namely the degree of dehydroxy, dehydration and vitrification, is directly influenced by the setting of the sintering length of the VAD loose body. In the conventional VAD loose body sintering process, if the sintering length of the VAD loose body is set to be too short, the whole VAD loose body is subjected to dehydroxylation, dehydration and vitrification (as shown in fig. 3 b), for example, the VAD loose body is only partially vitrified, optical fiber drawing is difficult, meanwhile, the whole rod can only be scrapped due to the fact that the VAD loose body is contacted with moisture and impurities of ambient air again, and the product loss is relatively large; the remedial scheme of resetting the correct sintering length of the VAD loose body for secondary dehydroxylation and dehydration easily causes the optical performance of the whole optical fiber preform mother rod to be greatly reduced; if the sintering length of the VAD loose body is set too long, the whole rod can be subjected to dehydroxy, dehydration and vitrification, for example, the vitrification is excessive, the whole target rod and the optical fiber preform mother rod can be thinned (as shown in fig. 3 d), the optical performance and the optical fiber drawing qualification rate of the manufactured optical fiber preform mother rod are greatly reduced, the target rod can be seriously broken, the optical fiber preform mother rod falls to the bottom of the furnace core tube, the optical fiber preform mother rod and the quartz furnace core tube are broken, the equipment and the products are completely scrapped, the production efficiency of the direct optical fiber preform is improved, and the production cost is greatly increased.
In the current manufacturing process of the optical fiber preform mother rod, abnormal conditions caused by too short and too long setting of the sintering length of the VAD loose body can be noticed by spot inspection staff only in the sintering process and after the sintering is finished, so that the phenomenon that manual intervention is delayed from the abnormal sintering conditions frequently occurs. The limit monitoring device disclosed in the Chinese patent No. 204174091U is used for monitoring the vitrification process of the optical fiber preform, and can maximally vitrify the VAD loose body on the premise of protecting the optical fiber preform mother rod and the sintered quartz furnace core tube, but because the monitoring device is positioned at a fixed position in the patent, the limit monitoring device can only monitor the VAD loose body with fixed length, cannot be flexibly applied to the actual VAD loose body sintering process, and cannot adapt to the huge optical fiber cable demand and the trend of 'coarse growth' of the VAD loose body under the development of the current industry.
Therefore, for the sintering length of the VAD loose body, in order to avoid the risks that the optical performance and the optical fiber drawing qualification rate of the optical fiber preform mother rod are deteriorated due to manual setting errors in the sintering process, the optical fiber preform mother rod is scrapped and the target rod is pulled and broken to cause the optical fiber preform mother rod to drop into the bottom of the furnace core tube to smash the quartz furnace core tube, there is a great need for a VAD loose body sintering length monitoring device and a monitoring method thereof, which can improve the sintering efficiency of the VAD loose body and ensure the safety of products and equipment.
Disclosure of Invention
Aiming at the defects of the prior art, the technical problem to be solved by the utility model is to provide the device for monitoring the sintering length of the VAD loose body and the monitoring method thereof, wherein the device can automatically calculate the real sintering length of the VAD loose body, and real-time audible and visual alarm reminds an operator whether the set sintering length of the VAD loose body to be sintered is correct, and the device safety is ensured by correcting and improving the sintering efficiency of the VAD loose body.
In order to achieve the technical purpose, the utility model adopts the following technical scheme: the utility model provides a device for monitoring VAD loose body sintering length, including the pylon guide rail, the lift platform that reciprocates along the pylon guide rail, the guide bar, laser emitter, laser receiver, a control system, laser range finder transmitter, laser range finder receiver, signal amplifier, range finding sensor and PLC control module, the VAD loose body hangs in lift platform lower bottom surface through the guide bar is perpendicular, the fritting furnace has been placed under the VAD loose body, the fire door upper end L1 high position of fritting furnace is fixed mounting respectively has laser emitter and laser receiver, laser emitter and laser receiver transversely are located the VAD loose body both sides, vertically lie in between furnace core pipe and the VAD loose body, laser emitter and laser receiver link to each other with control system respectively, control system still links to each other with laser range finder transmitter, laser range finder transmitter also lies in furnace core pipe mouth upper end L1 high position, laser range finder receiver is fixed in the lift platform bottom, laser range finder receiver passes through signal amplifier and range finding sensor in proper order and links to each other with control system, control system's internally mounted control system's sound and light control module carries out the input to the sintering to the PLC and corrects the length through the sound and the PLC.
In order to optimize the technical scheme, the specific measures adopted further comprise: the lifting platform is provided with a lifting motor, the lifting motor can drive the lifting platform to drive the VAD loose body to lift and move, and the control system controls the lifting motor to work.
The VAD loose body is attached to the lower end of the quartz target rod, the lower end of the guide rod is fastened to the upper end of the quartz target rod, and the upper end of the guide rod is vertically fixed to the lower bottom surface of the lifting platform, so that the VAD loose body is vertically suspended on the lower bottom surface of the lifting platform.
The guide rod is made of high-purity quartz and is high-temperature resistant.
The laser transmitter, the laser receiver and the laser range finder transmitter are all fixed at the upper end L1 height position of the furnace mouth of the sintering furnace through the metal bracket, and the range of the L1 value is 20-50 mm.
A horizontal laser penetrating axis A is formed between the laser transmitter and the laser receiver, and a vertical laser penetrating axis B is formed between the laser range finder transmitter and the laser range finder receiver.
A method of monitoring using a device for monitoring the sintered length of a VAD loose body: an operator manually inputs the length L0 of the VAD loose body to be sintered in a control system, a quartz cover plate is moved away from a tube orifice of a quartz furnace core tube, the VAD loose body to be sintered is deposited and attached to the surface of a quartz target rod, the VAD loose body obtained by deposition is fixed on the bottom of a rod connecting cylinder through quartz, the top of the rod connecting cylinder is fixed on the bottom of a guide rod, the guide rod is vertically hung on the lower bottom surface of a lifting platform, the lifting platform is started to drive the VAD loose body to descend to a sintering furnace, laser emitter emits laser along a laser penetrating axis A, the laser operator is manually input with the estimated sintering length L0 of the VAD loose body to be sintered in the control system according to the deposition length of the VAD loose body, the VAD loose body to be sintered is deposited and attached to the surface of the quartz target rod, the deposited VAD loose body is fixed on the bottom of the guide rod through quartz, the guide rod is vertically hung on the lower bottom surface of the lifting platform, the lifting platform is started to drive the VAD loose body to descend to the sintering furnace, the laser emitter emits laser along the laser penetrating axis A to be received by a laser receiver, when the bottom of the VAD loose body is contacted with the horizontal laser penetrating axis A, the laser receiver receives the received power P is instantaneously reduced to 0, the power change is fed back to the laser receiver and the laser penetrating axis A is controlled by the laser receiver, the laser receiver receives the real-time signal, the real-time ranging signal is amplified by the laser and the laser receiver and the real-time ranging signal is transmitted to the real-time ranging signal to the real-time ranging system, and the real-time ranging signal is calculated and the length is amplified by the laser ranging system, and the real-time ranging signal is calculated after the length is amplified and the real-time and the distance-time signal is transmitted to the distance and the distance is amplified through the control system and the laser and the distance.
l2=lx0-L3-L4 (formula 1)
Wherein: l2 is the true sintering length of the VAD loose body, LX0 is the laser ranging length, L3 is the length of the quartz target rod, and L4 is the length of the guide rod;
then, the control system further calculates the difference value DeltaL between the actual sintering length L2 of the VAD loose body and the estimated sintering length L0 manually input by an operator as follows:
Δl= |l2—l0| (formula 2)
In formula 2: l2 is the actual sintering length of the VAD loose body, and L0 is the estimated sintering length of the VAD loose body manually input by an operator;
before monitoring the sintering length of the VAD loose body, an operator sets a difference range A for DeltaL, in the monitoring process, when the DeltaL value calculated by a control system exceeds the difference range A, a PLC control module gives out an audible and visual alarm, synchronously, a control system drives a lifting platform to drive the VAD loose body to lift up to a position above a horizontal laser penetrating axis A again through controlling a lifting motor, the PLC control module resets the audible and visual alarm, and on-site operators review the estimated sintering length L0 of the VAD loose body to be sintered and correct the value of L0, and then repeat the operation, so that the monitoring of the sintering length of the VAD loose body is completed.
Further, the laser rangefinder transmitter begins transmitting ranging signals when the VAD porous body descends to near the horizontal laser penetration axis a.
Further, the laser ranging length LX0 is the real-time longitudinal distance between the laser rangefinder emitter and the laser rangefinder receiver.
Optimally, the difference range A is 0-3 mm, and the L3 and L4 are respectively 400-600 mm and 2000-4000 mm.
The utility model has the following beneficial effects: according to the device for monitoring the sintering length of the VAD loose body, the real sintering length of the VAD loose body is automatically calculated by using the control system before the process and production activities are started, and is timely fed back to the control system and site operators, and the operators are reminded of rechecking whether the set length of the VAD loose body to be sintered is correct and timely corrected by means of audible and visual alarm of the PLC control module, so that the problems that the optical performance and the optical fiber drawing qualification rate of an optical fiber preform are deteriorated due to manual setting errors in the sintering process, and the risk that the optical fiber preform is broken due to scrapping and pulling-off of a target rod, and the optical fiber preform falls down to the bottom of a furnace core tube to smash a quartz furnace core tube are avoided, the sintering efficiency of the VAD loose body is improved, and the safety of using equipment such as the furnace core tube is guaranteed.
Drawings
FIG. 1 is a schematic diagram of the structure of the present utility model;
FIG. 2 is a schematic length illustration of a guide rod, rod connector, quartz target rod and VAD loose body;
FIG. 3 is a graph showing different sintering efficiency results for VAD loose bodies.
Wherein the reference numerals are as follows: the device comprises a tower guide rail 1, a lifting platform 2, a guide rod 3, a laser transmitter 4, a laser receiver 5, a control system 6, a laser range finder transmitter 7, a laser range finder receiver 8, a signal amplifier 9, a range finding sensor 10 and a PLC control module 11.
Detailed Description
Embodiments of the present utility model are described in further detail below with reference to the accompanying drawings.
As shown in fig. 1, a device for monitoring sintering length of VAD loose body comprises a tower guide rail 1, a lifting platform 2 moving up and down along the tower guide rail 1, a guide rod 3, a laser emitter 4, a laser receiver 5, a control system 6, a laser range finder emitter 7, a laser range finder receiver 8, a signal amplifier 9, a range sensor 10 and a PLC control module 11, and is characterized in that the VAD loose body is vertically hung on the lower bottom surface of the lifting platform 2 through the guide rod 3, a sintering furnace is placed under the VAD loose body, the position of the height L1 of the upper end of the furnace mouth of the sintering furnace is fixedly provided with the laser emitter 4 and the laser receiver 5 respectively, the laser emitter 4 and the laser receiver 5 are transversely positioned on two sides of the VAD loose body and longitudinally positioned between a furnace core tube and the VAD loose body, the laser emitter 4 and the laser receiver 5 are respectively connected with the control system 6, the control system 6 is further connected with the laser range finder emitter 7, the laser range finder emitter 7 is also positioned at the position L1 of the upper end of the furnace core tube, the laser range finder receiver 8 is installed right above the laser range finder emitter 7, the laser range finder receiver 8 is fixedly arranged at the bottom of the VAD receiver 8 and the position of the VAD loose body is fixedly arranged under the furnace mouth of the VAD loose body, and the position is controlled by the control system 11, and the signal is sequentially input to the PLC control module 11 through the control system 11.
In the embodiment, a lifting motor is installed on the lifting platform 2, the lifting motor can drive the lifting platform 2 to drive the VAD loose body to lift, and the control system 6 controls the lifting motor to work.
In the embodiment, the VAD loose body is attached to the lower end of the quartz target rod, the lower end of the guide rod 3 is fastened to the upper end of the quartz target rod, and the upper end of the guide rod 3 is vertically fixed to the lower bottom surface of the lifting platform 2, so that the VAD loose body is vertically suspended on the lower bottom surface of the lifting platform 2.
In the embodiment, the guide rod 3 is made of high-purity quartz and resistant to high temperature.
In the embodiment, the laser transmitter 4, the laser receiver 5 and the laser range finder transmitter 7 are all fixed at the height position of the upper end L1 of the furnace mouth of the sintering furnace through metal brackets, and the range of the L1 value is 20-50 mm.
In an embodiment, a horizontal laser penetration axis a is formed between the laser transmitter 4 and the laser receiver 5, and a vertical laser penetration axis B is formed between the laser rangefinder transmitter 7 and the laser rangefinder receiver 8.
A method of monitoring using a device for monitoring the sintered length of a VAD loose body: an operator manually inputs the estimated sintering length L0 of the VAD loose body to be sintered in the control system 6 according to the deposition length of the VAD loose body, removes a quartz cover plate from a tube orifice of a quartz furnace tube, deposits the VAD loose body to be sintered on the surface of a quartz target rod, fixes the rod on the bottom of a guide rod 3 through quartz, the guide rod 3 is vertically hung on the lower bottom surface of a lifting platform 2, starts the lifting platform 2 to drive the VAD loose body to descend towards the sintering furnace, the laser transmitter 4 transmits laser to be received by the laser receiver 5 along a laser penetrating axis A, when the bottom of the VAD loose body touches the horizontal laser penetrating axis A, the receiving power P received by the laser receiver 5 is instantaneously reduced to 0, the power change is fed back to the control system 6 and the PLC control module 11 in real time through an electric signal, the laser distance measuring sensor 8 receives the distance measuring signal transmitted by the laser distance measuring transmitter 7 through the vertical laser penetrating axis B, the distance measuring signal is amplified by the signal amplifier 9 and then transmitted to the distance measuring sensor 10, the distance measuring length LX0 calculated by the distance measuring signal after the distance measuring sensor 10 is transmitted to the control system 6 in real time, and the real length L2 of the VAD loose body can be calculated by the control system 6 is the real length L2:
l2=lx0-L3-L4 (formula 1)
Wherein: l2 is the true sintering length of the VAD loose body, LX0 is the laser ranging length, L3 is the length of the quartz target rod, and L4 is the length of the guide rod 3;
then, the control system 6 further calculates a difference Δl between the actual sintering length L2 of the VAD loose body and the estimated sintering length L0 manually input by the operator as:
Δl= |l2—l0| (formula 2)
In formula 2: l2 is the actual sintering length of the VAD loose body, and L0 is the estimated sintering length of the VAD loose body manually input by an operator;
before monitoring the sintering length of the VAD loose body, an operator sets a difference range A for DeltaL, in the monitoring process, when the DeltaL value calculated by the control system 6 exceeds the difference range A, the PLC control module 11 gives out an audible and visual alarm, synchronously, the control system 6 drives the VAD loose body to be lifted to a position above the horizontal laser penetrating axis A again by controlling the lifting platform 2 driven by the lifting motor, the PLC control module 11 resets the audible and visual alarm, the on-site operator rechecks the estimated sintering length L0 of the VAD loose body to be sintered, corrects the value of L0, and then repeats the operation, so that the monitoring of the sintering length of the VAD loose body is completed.
The laser rangefinder transmitter 7 begins to transmit ranging signals when the VAD porous body descends to near the horizontal laser penetration axis a.
The laser ranging length LX0 is the real-time longitudinal distance between the laser range finder emitter 7 and the laser range finder receiver 8.
The difference range A is 0-3 mm, and the length L3 of the quartz target rod and the length L4 of the guide rod 3 are respectively 400-600 mm and 2000-4000 mm.
The specific steps for monitoring the sintering length of the VAD loose body by adopting the device for monitoring the sintering length of the VAD loose body are as follows:
step 1 is a cleaning stage before monitoring: the operator checks to ensure that the laser transmitter 4, the laser receiver 5, the laser range finder transmitter 7 and the laser range finder receiver 8 are stably supported, clear other devices with excessive running vibration around the laser devices, clear obstacles between the horizontal laser penetrating axis A and the vertical laser penetrating axis B, and perform shock absorption treatment on the tower guide rail 1 and the lifting platform 2;
step 2 is a preparation stage before monitoring the sintering length of the VAD loose body: setting DeltaL to be 2mm in a control system 6 by an operator, inputting an estimated sintering length L0 of a VAD loose body to be sintered in the control system 6, fixing the VAD loose body with the length of 500mm of a quartz target rod obtained by VAD deposition on the bottom of a guide rod 3 with the length of 3500mm, and vertically hanging the guide rod 3 on the lower bottom surface of a lifting platform 2;
step 3 is a VAD loose body sintering length monitoring stage: an operator starts the lifting platform 2 and sets the lifting platform 2 to pass through a horizontal laser penetrating axis A of 40mm at the upper end of a furnace mouth of the sintering furnace at a descending speed of 300mm/min, synchronously, laser emitted by the laser emitter 4 is received by the laser receiver 5 along the laser penetrating axis A, when the bottom of the VAD loose body touches the horizontal laser penetrating axis A, the receiving power P received by the laser receiver 5 is instantaneously reduced to 0, power change is fed back to the control system 6 and the PLC control module 11 in real time through electric signals, when the VAD loose body descends to the position close to the horizontal laser penetrating axis A, the laser range finder emitter 7 starts emitting ranging signals, the laser range finder receiver 8 receives the ranging signals emitted by the laser range finder emitter 7 through the vertical laser penetrating axis B, the ranging signals are amplified by the signal amplifier 9 and then transmitted to the ranging sensor 10, the ranging sensor 10 calculates the laser ranging length LX0 through the amplified ranging signals and transmits the laser ranging length LX0 to the control system 6 in real time, and at the moment, the control system 6 can calculate the actual sintering length L2 of the VAD loose body to be: l2=lx0-l3-l4=lx0-500-3500=lx0-4000, then the control system 6 further calculates the difference Δl between the true sintering length L2 of the VAD loose body and the estimated sintering length L0 manually entered by the operator as: in the monitoring operation process, if the value of DeltaL is larger than 2mm, synchronously, the device for monitoring the sintering length of the VAD loose body sends out an audible and visual alarm through the PLC control module 11, synchronously, the control system 6 drives the VAD loose body to be lifted to the position above the horizontal laser penetrating axis A again by controlling the lifting motor to drive the lifting platform 2, the PLC control module 11 resets the audible and visual alarm, an on-site operator reviews the estimated sintering length L0 of the VAD loose body to be sintered, corrects the value of L0, and then repeats the operation, so that the monitoring of the sintering length of the VAD loose body is completed.
The above is only a preferred embodiment of the present utility model, and the protection scope of the present utility model is not limited to the above examples, and all technical solutions belonging to the concept of the present utility model belong to the protection scope of the present utility model. It should be noted that modifications and adaptations to the utility model without departing from the principles thereof are intended to be within the scope of the utility model as set forth in the following claims.
Claims (8)
1. The device for monitoring the sintering length of the VAD loose body comprises a tower guide rail (1), a lifting platform (2) which moves up and down along the tower guide rail (1), a guide rod (3), a laser emitter (4), a laser receiver (5), a control system (6), a laser range finder emitter (7), a laser range finder receiver (8), a signal amplifier (9), a range finding sensor (10) and a PLC control module (11), and is characterized in that the VAD loose body is vertically hung on the lower bottom surface of the lifting platform (2) through the guide rod (3), a sintering furnace is placed under the VAD loose body, a laser emitter (4) and a laser receiver (5) are fixedly installed at the height position of the upper end L1 of a furnace mouth of the sintering furnace respectively, the laser emitter (4) and the laser receiver (5) are transversely positioned at two sides of the VAD loose body and longitudinally positioned between a furnace core tube and the VAD loose body, the laser emitter (4) and the laser receiver (5) are respectively connected with the control system (6), the control system (6) is also connected with the laser range finder emitter (7), the laser emitter (7) is also fixedly installed at the position of the laser range finder receiver (8) on the upper end L1 of the sintering furnace core, the laser range finder (8) is fixedly positioned at the upper end L1 of the laser range finder receiver (8), the laser range finder receiver (8) is connected with the control system (6) sequentially through the signal amplifier (9) and the range finding sensor (10), a PLC control module (11) is installed in the control system (6), and the PLC control module (11) reminds an operator to review and correct the input VAD loose body sintering length through audible and visual alarm;
the VAD loose body is attached to the lower end of the quartz target rod, the lower end of the guide rod (3) is fastened to the upper end of the quartz target rod, and the upper end of the guide rod (3) is vertically fixed to the lower bottom surface of the lifting platform (2), so that the VAD loose body is vertically suspended on the lower bottom surface of the lifting platform (2);
a horizontal laser penetrating axis A is formed between the laser transmitter (4) and the laser receiver (5), and a vertical laser penetrating axis B is formed between the laser range finder transmitter (7) and the laser range finder receiver (8).
2. The apparatus for monitoring the sintered length of a VAD porous body according to claim 1, characterized in that: the lifting platform (2) is provided with a lifting motor, the lifting motor can drive the lifting platform (2) to drive the VAD loose body to lift, and the control system (6) controls the lifting motor to work.
3. The apparatus for monitoring the sintered length of a VAD porous body according to claim 1, characterized in that: the guide rod (3) is made of high-purity quartz and resistant to high temperature.
4. The apparatus for monitoring the sintered length of a VAD porous body according to claim 2, characterized in that: the laser transmitter (4), the laser receiver (5) and the laser range finder transmitter (7) are all fixed at the height position of the upper end L1 of the furnace mouth of the sintering furnace through metal brackets, and the range of the L1 value is 20-50 mm.
5. A monitoring method employing the device for monitoring the sintered length of a VAD porous body as claimed in any of claims 1-4, characterized in that: an operator manually inputs the estimated sintering length L0 of the VAD loose body to be sintered in a control system (6) according to the deposition length of the VAD loose body, the VAD loose body to be sintered is deposited and attached to the surface of a quartz target rod, the deposited VAD loose body is fixed on the bottom of a guide rod (3) through quartz, the guide rod (3) is vertically hung on the lower bottom surface of a lifting platform (2), the lifting platform (2) is started to drive the VAD loose body to descend towards a sintering furnace, a laser emitter (4) emits laser to be received by a laser receiver (5) along a laser penetrating axis A, when the bottom of the VAD loose body touches the horizontal laser penetrating axis A, the receiving power P received by the laser receiver (5) is instantaneously reduced to 0, the power change is fed back to the control system (6) and a PLC control module (11) in real time through an electric signal, simultaneously, a ranging signal emitted by a laser ranging instrument emitter (7) is received by a laser ranging sensor (10) through the vertical laser penetrating axis B, the ranging signal is amplified and then transmitted to a ranging sensor (10), and the real length of the VAD loose body can be calculated by the laser receiver (6) to be the real-time length L0 of the control system (6):
l2=lx0-L3-L4 (formula 1)
Wherein: l2 is the true sintering length of the VAD loose body, LX0 is the laser ranging length, L3 is the length of the quartz target rod, and L4 is the length of the guide rod (3);
then, the control system (6) further calculates the difference value DeltaL between the actual sintering length L2 of the VAD loose body and the estimated sintering length L0 manually input by an operator as follows:
Δl= |l2—l0| (formula 2)
In formula 2: l2 is the actual sintering length of the VAD loose body, and L0 is the estimated sintering length of the VAD loose body manually input by an operator;
before monitoring the sintering length of the VAD loose body, an operator sets a difference range A for DeltaL, in the monitoring process, when the DeltaL value calculated by a control system (6) exceeds the difference range A, a PLC control module (11) gives out an audible and visual alarm, synchronously, the control system (6) drives the VAD loose body to be lifted to a position above a horizontal laser penetrating axis A again by controlling a lifting platform (2) driven by a lifting motor, the PLC control module (11) resets the audible and visual alarm, on-site operators review the estimated sintering length L0 of the VAD loose body to be sintered, correct the value of L0, and then repeat the operation, so that the monitoring of the sintering length of the VAD loose body is completed.
6. The method of claim 5, wherein the means for monitoring the sintered length of the VAD porous body is configured to: the laser range finder transmitter (7) starts to transmit a range finding signal when the VAD loose body descends to be close to the horizontal laser penetrating axis A.
7. The method of claim 5, wherein the means for monitoring the sintered length of the VAD porous body is configured to: the laser ranging length LX0 is the real-time longitudinal distance between the laser range finder emitter (7) and the laser range finder receiver (8).
8. The method of claim 5, wherein the means for monitoring the sintered length of the VAD porous body is configured to: the difference range A is 0-3 mm, and the length L3 of the quartz target rod and the length L4 of the guide rod (3) are respectively 400-600 mm and 2000-4000 mm.
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| CN110104946B (en) * | 2019-06-04 | 2023-07-25 | 江苏通鼎光棒有限公司 | Optical fiber perform sintering equipment |
| CN110330221B (en) * | 2019-07-04 | 2022-01-04 | 烽火通信科技股份有限公司 | Intelligent sintering system and method for optical fiber preform |
| CN110426988B (en) * | 2019-08-12 | 2021-11-16 | 江苏亨通光导新材料有限公司 | Laser micro-vibration sensing recording adjusting device and adjusting method thereof |
| CN110510863B (en) * | 2019-09-25 | 2023-12-29 | 江苏亨通光导新材料有限公司 | VAD lifting control device and corresponding control method |
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