CN105606275B - The core plate on-line monitoring system and method for a kind of membrane filter plate - Google Patents
The core plate on-line monitoring system and method for a kind of membrane filter plate Download PDFInfo
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- CN105606275B CN105606275B CN201510969891.6A CN201510969891A CN105606275B CN 105606275 B CN105606275 B CN 105606275B CN 201510969891 A CN201510969891 A CN 201510969891A CN 105606275 B CN105606275 B CN 105606275B
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Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L1/00—Measuring force or stress, in general
- G01L1/24—Measuring force or stress, in general by measuring variations of optical properties of material when it is stressed, e.g. by photoelastic stress analysis using infrared, visible light, ultraviolet
- G01L1/242—Measuring force or stress, in general by measuring variations of optical properties of material when it is stressed, e.g. by photoelastic stress analysis using infrared, visible light, ultraviolet the material being an optical fibre
- G01L1/246—Measuring force or stress, in general by measuring variations of optical properties of material when it is stressed, e.g. by photoelastic stress analysis using infrared, visible light, ultraviolet the material being an optical fibre using integrated gratings, e.g. Bragg gratings
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K11/00—Measuring temperature based upon physical or chemical changes not covered by groups G01K3/00, G01K5/00, G01K7/00 or G01K9/00
- G01K11/32—Measuring temperature based upon physical or chemical changes not covered by groups G01K3/00, G01K5/00, G01K7/00 or G01K9/00 using changes in transmittance, scattering or luminescence in optical fibres
- G01K11/3206—Measuring temperature based upon physical or chemical changes not covered by groups G01K3/00, G01K5/00, G01K7/00 or G01K9/00 using changes in transmittance, scattering or luminescence in optical fibres at discrete locations in the fibre, e.g. using Bragg scattering
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Abstract
The invention discloses the core plate on-line monitoring system and method for a kind of membrane filter plate,System includes fiber Bragg grating (FBG) demodulator,Fiber coupler,Processor and fiber-optic grating sensor component,Wherein,Fiber-optic grating sensor component is arranged in core plate,Light source sends optical signal,Optical signal is transferred to fiber-optic grating sensor component by fiber coupler,After optical signal interacts with fiber grating,Reflected light enters fiber Bragg grating (FBG) demodulator by fiber coupler,Fiber Bragg grating (FBG) demodulator connects processor,Processor calls core plate damage data storehouse,Analyze degree of injury,Establish threedimensional model,Export the damage profile of core plate,The present invention can assess the health condition of core plate,And early warning is issued in time,Contribute to accurate quick exclusion core plate failure and potential safety hazard,Avoid security incident and production loss,Ensure device fabrication producer and the interests of user both sides.
Description
Technical field
The present invention relates to the core plate on-line monitoring system and method for a kind of membrane filter plate.
Background technology
Chamber Type Diaphragm Filter Press has the advantages that squeeze pressure height, good corrosion resistance, easy to maintenance, safe and reliable, is smelting
Gold, papermaking, pharmacy, food, brewage, the first choice of the industry such as sludge.
Chamber-type press filter is a kind of pressure filtration facility of intermittently operated, it is necessary to continuous loading and unloading.And in reality
In the working environment on border, filter plate both sides pressure may be serious unbalanced or due to filter under the extraordinary operating mode such as line clogging
Cloth breakage causes filter plate directly to be impacted by slurry.So, filter plate is in periodically frequently is carried by dynamic outside non-uniform face
The state of lotus, environment is carried so as to more be degrading it.In use, filter plate to varying degrees all can there is fatigue
The phenomenon of cracking.
The operation principle of Chamber Type Diaphragm Filter Press is a number of common chamber filter plate and membrane filter plate in strong mechanical force
In the presence of filter chamber rearranged by close interaction, filter pulp is inputted into filter chamber under the pressure effect of dehvery pump, passes through to filter and is situated between
Matter filter cloth separates the solid in filter pulp and liquid.After the completion of normal filtering, compressed media (such as gas and water) enters membrane filter plate
Crushing chamber eardrum reduce filter chamber volume, extrude filter cake to both sides so as to being further compacted filter cake.Chamber Type Diaphragm Filter Press every
Membrane filtration plate includes main body core plate and core plate, and two layers of barrier film, main body core plate primarily serve the effect of rigid support up and down.
However, the filter plate that production scene investigation is damaged is wasted time and energy, the long-term experience accumulation for relying on experienced operator, and therefore
Barrier investigation can only could also be carried out after the situation of irremediable loss is had occurred and that.The filter plate of damage is in unwitting situation
Under work on great damage may be caused to whole equipment.So, the health monitoring technique of filter plate usage is for press filtration
Machine filter plate is particularly important, and the health monitoring under usage state is carried out to it to ensure safety in production, filter plate of problems is entered
Row real-time early warning, realizes malfunction elimination in advance, extends the safe operating life of filter plate to a certain extent.Meanwhile it can also divide
The filter plate usage status data from collection in worksite record preservation is analysed to judge whether user has row in violation of rules and regulations in operation
For the product quality dispute problem being effectively prevented between equipment manufacturer and customer.In addition, contribute to filter press from being automated to
Intelligentized technology upgrading.
Conventional health monitor method mainly in a manner of some nondestructive inspections, including ray, ultrasound, infrared, vortex,
Microwave, laser hologram photography technology, visual detection etc..The characteristics of these conventional lossless detection methods is offline, static, passive
's.Up to the present, restricted by multi-party surface technology and sensor condition, China not yet occurs to filter press filter board usage state
The technology being monitored.
The content of the invention
The present invention is in order to solve the above problems, it is proposed that the core plate on-line monitoring system and method for a kind of membrane filter plate, this
Invention can realize the filter plate use state of dynamic realtime Non-Destructive Testing filter press, calculate the residual intensity of filter plate, and to filter plate
Security and remaining life estimated, improve service efficiency, the safe running performance of filter press, reduce maintenance into
This, contributes to filter press from being automated to intelligentized technology upgrading.
To achieve these goals, the present invention adopts the following technical scheme that：
A kind of core plate on-line monitoring system of membrane filter plate, including fiber Bragg grating (FBG) demodulator, fiber coupler, processor and
Fiber-optic grating sensor component, wherein, fiber-optic grating sensor component is arranged in core plate, and light source sends optical signal, optical signal
Fiber-optic grating sensor component is transferred to by fiber coupler, after optical signal interacts with fiber grating, reflected light is passed through
Fiber coupler enters fiber Bragg grating (FBG) demodulator, fiber Bragg grating (FBG) demodulator connection processor.
The processor calls membrane filter plate core plate damage data storehouse, analyzes degree of injury, establishes threedimensional model, exports core
The damage profile of plate, assess the health condition of core plate.
Further, the fiber coupler has two, and optical signal is divided into two-way, is passed respectively by a fiber coupler
The defeated both ends to fiber-optic grating sensor component, form two ports.
Further, the optical signal is transferred to one end of fiber-optic grating sensor component by a fiber coupler,
Form one and have the port that light is incident and reflects concurrently.
Preferably, the light source is the built-in light source of fiber Bragg grating (FBG) demodulator, produces continuous frequency modulation laser, and laser signal leads to
Cross lead and enter fiber grating, form stable reflected signal.
The fiber-optic grating sensor component, include the fiber grating pair sensor insert of several columns, the fiber grating
Measurement temperature is used for sensor insert, including optical fiber temperature grating and strain fiber grating, optical fiber temperature grating, strains optical fiber
Grating is used for measuring strain, and optical fiber temperature grating is parallel with strain fiber grating, arranged adjacent, each in optical fiber temperature grating
Temperature raster unit and each strain raster unit of strain fiber grating correspond so that optical fiber temperature and it is adjacent should
Become optical fiber and form a fiber grating pair.
Described optical fiber temperature grating should be spaced apart in parallel, arranged adjacent with strain fiber grating, to keep away
Exempt from the caused local strengthening phenomena impair strain fiber grating test in filter plate of the hard capillary outside optical fiber temperature grating
The material deformation in area.The normal distance of two parallel optical fiber is 5-12mm, preferably 10mm.
The fiber grating pair sensor insert is fixed on filter sheet core board mold inner chamber, in molding or injection moulding process and
Core plate is integrally formed.In forming process, the end of inserts extends to the side wall of dies cavity, ensures the optical fiber light in inserts
Grid can easily draw from core plate to sensor and reliably be protected.
The end of the fiber grating pair sensor insert is provided with the joints of optical fibre, divides in fiber grating pair sensor insert
Several rod shaped supports are furnished with, to realize the positioning and fixation of inserts in a mold in molding, injection molding process.
The fiber grating pair sensor is encapsulated using thermoplastic, is preferably moulded with core material identical thermoplasticity
Material, it will be buried in core plate structure with the one or both ends for joint is buried in double-core optical fiber connector being pre-installed on encapsulating mould, optical fiber
Grating is opposite in encapsulating mould, and thermoplastic melt is poured into a mould into mould, and die sinking is to obtain thermoplastic envelope after cooling
The end of dress carries the fiber grating pair sensor insert of double-core optical fiber connector.
Further, the rod shaped support is engaged with default mounting hole on core plate mould, can also be by rod shaped support
End be adhesively fixed on mould to realize the positioning and fixation of inserts in a mold.
The fiber grating pair sensor insert can be that unidirectional lead can also be two-way lead, can include multiple
The raster unit of different centre wavelengths is carved with, each raster unit is an independent sensor unit.Can be only to grid region
Encapsulation, can also be to burying partial encapsulation in whole fiber grating pair.So, the fiber grating pair after encapsulation can unidirectionally be drawn
The block fiber grating pair sensor insert in the single grid region pair of line, the multiple grid regions of unidirectional lead to bar-shaped, two-way lead bulk with
And two-way lead rod-type optical fibre grating is to sensor insert.
The joints of optical fibre include interior the interior of membrane filter plate core plate frame that be embedded in and bury joint, block head and external connector
Three parts, in core plate forming process in bury joint one end and be connected with the interior fiber grating pair sensor buried, one end is matched somebody with somebody with block head
Close, core plate removes block head after subsequent mechanical is processed after shaping, by the interior fiber grating pair sensor buried in joint
It is connected with the optical fiber of external connector, realizes that the fiber grating pair sensor being embedded in inside core plate is connected with (FBG) demodulator.
The processor includes fiber grating signal resolution module, core plate damage data library module, CAD modeling modules, CAE
Finite element analysis module, core plate health total evaluation module and display output module, wherein, the fiber grating signal resolution mould
Block, for parsing the signal of fiber Bragg grating (FBG) demodulator collection；The core plate damage data library module, for storing core plate damage number
According to；The CAD modeling modules, for establishing the 3-D geometric model of core plate；The CAE finite element analysis modules, for emulating
Calculate core plate degree of injury；The core plate health total evaluation module, for the damage profile condition evaluation core plate according to core plate
Health condition；The display output module, for showing the 3-D geometric model and health condition of core plate.
The fiber coupler is fiber grating signal coupler, has the spy of excellent wavelength selective power and multiport
Property, it is compact-sized, the fiber coupler that loss is small, polarization is unrelated.
The fiber Bragg grating (FBG) demodulator is middling speed or high speed optic fiber grating wavelength (FBG) demodulator, has the demodulation of multi-channel parallel
Scheme, signal fast demodulation is realized, meet health monitoring needs, can believed with grating of the fast demodulation filter plate under working environment
Number.
The LASER Light Source, fiber coupler, fiber grating pair sensor are connected by optical fiber, fiber Bragg grating (FBG) demodulator
Connected with fiber coupler by optical fiber, transmission signal is optical signal, and fiber Bragg grating (FBG) demodulator and processor are connected by data wire
Connect, transmission signal is data signal.
A kind of method based on above-mentioned monitoring system, comprises the following steps：
(1) raster unit is scribed according to the structure of membrane filter plate core plate and monitoring needs, and each raster unit is compiled
Number, select two fiber gratings to set up fiber grating pair；
(2) poured using thermoplastic melt burying joint in fiber grating pair sensor and double-core optical fiber connector
The mode of note is packaged in encapsulating mould, obtains fiber grating pair sensor insert；
(3) membrane filter plate core plate is prepared using molding or Shooting Technique, realizes membrane filter plate core plate and fiber grating pair
Sensor insert is integrally formed；
(4) joint point is buried in the double-core optical fiber connector the one or both ends of each fiber grating pair sensor insert
Not Lian Jie fiber coupler corresponding ports, fiber coupler passes through intelligent acess fiber Bragg grating (FBG) demodulator, fiber grating demodulation
Instrument connects signal processor by data wire, the signal of signal processor parsing fiber Bragg grating (FBG) demodulator collection, solves barrier film filter
Plate core plate temperature, strain and stress；
(5) 3-D geometric model of membrane filter plate core plate is established, membrane filter plate core plate is calculated using finite element method
Degree of injury, judge whether core plate damages, if damaging, judge damage position and degree of injury, output damage,
And then evaluate core plate health degree.
In the step (3), membrane filter plate core plate molding or injection molding before, in dies cavity according to encapsulation after
Fiber grating pair sensor insert rod shaped support quantity preset mounting hole, by the bar-shaped branch of fiber grating pair sensor insert
Support coordinates with default mounting hole in dies cavity, or rod shaped support end viscose glue is connect and fixed realizes inserts consolidating in a mold
It is fixed；Joint will be buried in the joints of optical fibre of inserts end with block head to coordinate；In the molding of membrane filter plate core plate or injection molding
Afterwards, the rod shaped support of the fiber grating pair sensor insert by excessive residual outside core plate is removed, and core plate surface is polished
It is smooth.
In the step (5), specific steps include：
(5-1) establishes the 3-D geometric model of core plate using CAD modeling softwares, and imports CAE finite element analysis softwares, draws
Subnetting lattice, establish FEM model；
(5-2) establishes unit e in FEM model according to locus corresponding relationxkjWith raster unit xkj correspondence
Relation：The temperature of grating measuring, strain and stress are mapped in FEM model, carry out the temperature field of core plate
With the finite element modelling of stress-strain field；
The signal that the transmission of (5-3) processor reception optical fiber grating demodulation instrument comes, and count dead grating numbering；
(5-4) the grating xkj signals received are handled after and core plate damage data storehouse in corresponding damage data
Model contrasts, and whether the core plate of diagnosis grating cell position occurs damage and degree of injury, establishes raster unit and core plate damage
Hinder the relation between degree：xkj→d(xkj)；
(5-5) combines step (5-2), (5-4), obtains the raster unit group in FEM model in health monitoring process
The variation relation of middle degree of injury：e(xkj)→d(xkj), the finite element modelling result and step (5-4) of comparative analysis degree of injury
The diagnostic result of middle gained, enrich, the damage data storehouse of optimization core plate, the distribution of core plate degree of injury is then exported by cloud atlas
State；
(5-6) estimates the security and service life of core plate, sends alarm in time, improve core plate according to degree of injury
Usage security.
In the step (5), the processing of double lead grating signal has selectivity：When optical fiber is intact, what processor received
Two lead signal of same grating are identical, only working process one end lead transmission signal；If fibercuts, both ends lead passes
Defeated signal is different, and processor needs to handle two end signals simultaneously.
Beneficial effects of the present invention are：
(1) the invention provides a kind of online health monitoring systems of core plate of membrane filter plate and method, barrier film filter is realized
Real time on-line nondestructive monitoring of the plate core plate under complex working condition, this monitoring system and method are that the filter press filter board based on maturation is given birth to
Production technology, exploitativeness is strong, is easy to realize in large-scale production.
(2) the invention provides the core plate damage position of visualization output membrane filter plate and the online health prison of degree of injury
The method of examining system and signal transacting, and early warning is issued in time, contribute to accurate quick exclusion filter plate failure and potential safety hazard,
Security incident and production loss are avoided, ensures device fabrication producer and the interests of user both sides.
Brief description of the drawings
Structural representation of the two-way wire fiber Bragg gratings of Fig. 1 thin rod shapes to sensor insert；
Structural representation of the unidirectional wire fiber Bragg gratings of Fig. 2 thin rod shapes to sensor insert；
A kind of online health monitoring systems schematic diagram of core plates of upper feeding barrier diaphragm filter plate of Fig. 3；
A kind of online health monitoring systems schematic diagrames of the core plate of middle feedstock diaphragm filter panel of Fig. 4.
1 fiber-optical grating temperature sensor；2 fiber Bragg grating strain sensors；Twin-core joint is buried in 3 joints of optical fibre；4 optical fiber
Grating is to sensor insert rod shaped support；5 core plate upper feeding holes；6 two-way lead thin rod shape fiber grating pair sensor inserts；7
Squeezing gas and water enters hole；8 cross-drilled holes；Charging hole in 9 core plates；10 unidirectional lead thin rod shape fiber grating pair sensor inserts.
Embodiment：
The invention will be further described with embodiment below in conjunction with the accompanying drawings.
A kind of online health monitoring systems of the core plate of membrane filter plate, including fiber Bragg grating (FBG) demodulator, fiber coupler, processing
Device and the fiber grating pair sensor insert and core suitable for core plate molding, the shaft-like encapsulation of polypropelene fine of injection molding process
Buried in harden structure and use double-core optical fiber connector.Process is that independent light source or fiber Bragg grating (FBG) demodulator built-in light source sends optical signal,
Optical signal is divided into two-way by optical fiber and is transferred to by the fiber coupler of the left and right sides two or a unilateral fiber coupler
The both ends or one end of fiber grating pair sensor, form two or one and have the port that light is incident and reflects concurrently, pre-fix
Core plate dies cavity the shaft-like encapsulation of polypropelene fine fiber grating pair sensor insert in molding or injection moulding process and
Core plate is integrally formed, and after optical signal and fiber grating Thermodynamic parameters, reflected light enters fiber grating solution by fiber coupler
Instrument, fiber Bragg grating (FBG) demodulator connection processor are adjusted, processor calls core plate damage data storehouse, analyzes degree of injury, establishes three-dimensional
Model, the damage profile of core plate is exported, assess the health condition of core plate.
Fiber grating pair sensor insert includes two fiber gratings, i.e. an optical fiber temperature grating and a strain optical fiber
Grating, optical fiber temperature grating are used for measurement temperature, and strain fiber grating is used for measuring strain, optical fiber temperature grating and strain optical fiber
Parallel gratings, arranged adjacent, each temperature raster unit in optical fiber temperature grating answer darkening with each of strain fiber grating
Grid unit corresponds, so that optical fiber temperature and adjacent strain optical fiber form a fiber grating pair.
Described optical fiber temperature grating should be spaced apart in parallel, arranged adjacent with strain fiber grating, preferably
10mm, to avoid the caused local strengthening phenomena impair strain optical fiber in core plate of the hard capillary outside optical fiber temperature grating
The material deformation in grating test area.Described fiber grating pair sensor insert employs the polypropylene of fiber grating pair sensor
Encapsulation technology, encapsulation grid region pair or the whole interior sensor insert with rod shaped support for burying part is made, has ensured optical fiber
Grating can effectively be fixed in the molding of core plate, injection molding process to sensor and is not molded or injection pressure
Destroy.
Fixation of the fiber grating pair sensor insert in the molding of core plate, injection molding process is by the bar-shaped of inserts
Support and be molded, presetting mounting hole in the mould of injection core plate come what is realized, the rod shaped support in inserts can also be passed through
End is adhesively fixed on mould to realize the positioning and fixation of inserts in a mold.
The polypropylene encapsulation technology of fiber grating pair sensor is to be buried in core plate structure with double-core optical fiber connector
The one or both ends that joint is pre-installed on encapsulating mould are buried, fiber grating is opposite in encapsulating mould, and poly- third is poured into a mould into mould
Alkene melt, after cooling die sinking i.e. obtain polypropylene encapsulation end with double-core optical fiber connector fiber grating pair sensor it is embedding
Part.The shaft-like inserts that can be formed with rod shaped support can be made in encapsulating mould.
Optical fiber can be that unidirectional lead can also be two-way lead, can include multiple light for being carved with different centre wavelengths
Grid unit, each raster unit are an independent sensor units.Only grid region can be encapsulated, can also be to whole optical fiber
Partial encapsulation is buried in grating.So, the fiber grating pair after encapsulation can be the block optical fiber in the single grid region pair of unidirectional lead
Grating is to sensor insert, the multiple grid regions of unidirectional lead are block to bar-shaped, two-way lead and two-way lead rod-type optical fibre grating
To sensor insert.
Buried in core plate structure includes interior be embedded in core plate frame with double-core optical fiber connector buries joint, block head and external
Joint three parts.Joint one end is buried in core plate forming process to be connected with the interior fiber grating pair sensor buried, one end and closure
Head coordinates, and core plate after shaping removes block head after subsequent mechanical is processed, by the interior fiber grating pair buried in joint
The optical fiber of sensor and external connector connects, and realizes that the fiber grating pair sensor being embedded in inside core plate connects with fiber coupler
Connect.
Light source can be that arbitrary source can also be built in fiber Bragg grating (FBG) demodulator, produce continuous frequency modulation laser, laser
Signal enters fiber grating by lead, forms stable reflected signal.
It is limited that processor includes fiber grating signal resolution module, core plate damage data library module, CAD modeling modules, CAE
Meta analysis module, core plate health total evaluation module and display output module, wherein, the fiber grating signal resolution module,
For parsing the signal of fiber Bragg grating (FBG) demodulator collection；The core plate damage data library module, for storing core plate damage data；
The CAD modeling modules, for establishing the 3-D geometric model of core plate；The CAE finite element analysis modules, for calculating core plate
Degree of injury；The core plate health total evaluation module, for assessing the health condition of filter plate according to the damage profile of core plate；Institute
Display output module is stated, for showing the 3-D geometric model and health condition of core plate.
Fiber coupler is fiber grating signal coupler, has the characteristic of excellent wavelength selective power and multiport,
It is compact-sized, the fiber coupler that loss is small, polarization is unrelated.
Fiber Bragg grating (FBG) demodulator is middling speed or high speed optic fiber grating wavelength (FBG) demodulator, has the demodulation side of multi-channel parallel
Case, signal fast demodulation is realized, meet health monitoring needs, grating signal that can be with fast demodulation filter plate under working environment.
LASER Light Source, fiber coupler, fiber grating pair sensor are connected by optical fiber, fiber Bragg grating (FBG) demodulator and light
Fine coupler is connected by optical fiber, and transmission signal is optical signal, and fiber Bragg grating (FBG) demodulator is connected with processor by data wire, is passed
Defeated signal is data signal.
A kind of method of the online health monitoring of the core plate of membrane filter plate, comprises the following steps：
(1) optical fiber is selected, grating is scribed according to the structure of membrane filter plate core plate and monitoring needs, every optical fiber can be carved
Multiple raster units are made, and each raster unit is numbered, lead can be drawn from the one or both ends of sensor, and formation is singly drawn
Line or double lead fiber grating string, and the temperature coefficient of grating is demarcated；
(2) two fiber gratings are selected to set up fiber grating pairs, a fiber grating is used for measurement temperature, labeled as T, separately
One fiber grating measuring strain, labeled as S, mark the T equal outer case sleeve of grating, mouth of pipe glue envelope；
(3) to burying joint in fiber grating pair sensor and double-core optical fiber connector using melt polypropylene cast
Mode is packaged, and obtains fiber grating pair sensor insert；
(4) before the core plate molding or injection molding of membrane filter plate, according to the optical fiber light after encapsulation in dies cavity
Grid preset mounting hole to the rod shaped support quantity of sensor insert, by the rod shaped support and mould of fiber grating pair sensor insert
Default mounting hole coordinates in inner chamber, can also be bonded rod shaped support end and realize the positioning of inserts in a mold in a mold
And fixation；Joint will be buried in the joints of optical fibre of inserts end with block head to coordinate；
(5) core plate is prepared using molding or Shooting Technique, realizes the one of core plate and fiber grating pair sensor insert
Shaping；After core plate molding or injection molding, by the bar-shaped of fiber grating pair sensor insert of the excessive residual outside core plate
Support is removed, and core plate surface is polished flat；
(6) core plate after being molded is removing block head after follow-up machining, and each fiber grating pair is sensed
The corresponding ports that joint connects fiber coupler respectively, optical fiber are buried in the double-core optical fiber connector of the one or both ends of device inserts
Coupler connects signal processor, signal by intelligent acess fiber Bragg grating (FBG) demodulator, fiber Bragg grating (FBG) demodulator by data wire
The signal of processor parsing fiber Bragg grating (FBG) demodulator collection, solves core plate temperature, strain and stress；
(7) 3-D geometric model of core plate is established, the degree of injury of core plate is calculated using finite element method, judges core
Whether plate damages, if damaging, judges damage position and degree of injury, output damage, and then evaluate core plate health
Degree.
(7-1) establishes the 3-D geometric model of core plate using CAD modeling softwares, and imports CAE finite element analysis softwares, draws
Subnetting lattice, establish FEM model；
(7-2) establishes unit e in FEM model according to locus corresponding relationxkjWith raster unit xkj correspondence
Relation：The temperature of grating measuring, strain and stress are mapped in FEM model, carry out the temperature field of core plate
With the finite element modelling of stress-strain field；
The signal that the transmission of (7-3) processor reception optical fiber grating demodulation instrument comes, and count dead grating numbering；
(7-4) the grating xkj signals received are handled after and core plate damage data storehouse in corresponding damage data
Model contrasts, and whether the core plate of diagnosis grating cell position occurs damage and degree of injury, establishes raster unit and core plate damage
Relation between degree：xkj→d(xkj)；
(7-5) combines step (7-2), (7-4), and the raster unit obtained in FEM model is damaged during health monitoring
Hinder the variation relation of degree：E (xkj) → d (xkj), in the finite element modelling result and step (7-4) of comparative analysis degree of injury
The diagnostic result of gained, enrich, the damage data storehouse of optimization core plate, the distribution shape of core plate degree of injury is then exported by cloud atlas
State；
(7-6) estimates the security and service life of core plate, sends alarm in time, improve core plate according to degree of injury
Usage security.
In step (7), the processing of double lead grating signal has selectivity：When optical fiber is intact, processor receives same
Two lead signal of grating are identical, only working process one end lead transmission signal；If fibercuts, both ends lead transmission letter
Number difference, processor need to handle two end signals simultaneously.
Optical fiber Bragg raster (Fiber Bragg Grating, FBG) is a kind of to stress, strain and temperature sensitive biography
Sensing unit, can be achieved simple optical fiber to tens strain node measurements, have precision height, small volume, in light weight, long lifespan,
The advantages that reliability is high, corrosion-resistant, transmission range is long, the measurement of the different kinds of parameters such as strain, stress, temperature can be achieved, following
Optical fiber Bragg raster is selected in embodiment.
Embodiment one：The online health monitoring device of core plate and method of a kind of upper feeding van-type membrane filter plate.
As shown in figure 3, system includes：The two-way wire fiber Bragg gratings of thin rod shape are to sensor insert 6, fiber coupling
Device, optical fibre grating digital demodulation instrument, computer system etc..
The two-way wire fiber Bragg gratings of thin rod shape are to the structure of sensor insert 6 as shown in figure 1, each fiber grating two
End is leaded, forms two signalling channels, after being broken by external force, 1 double lead grating sensor can become 2 and singly draw
Linear light gate sensor, grating with normal work, can ensure the stability of on-line monitoring process monitoring.
(1) according to upper feeding van-type membrane filter plate core plate size, the optical fiber for scribing 26 40 μm of cladding diameters scribes grating.
The raster unit of 10 different centre wavelengths, numbering 1-10 are scribed on every optical fiber.
(2) two are taken to scribe optical fiber composition fiber grating pair, and it is 1-13 to number, temperature survey grating outer casing stainless steel
Steel pipe, mouth of pipe glue envelope, labeled as T, strain grating marker is S.
(3) fiber grating pair is packaged, joint 3 will be buried in double-core optical fiber connector first and be pre-installed on encapsulating mould
Both ends, two optical fiber are fixed in shaft-like encapsulating mould, keep two optical fiber raster unit position correspondence, two optical fiber are apart
10mm, the lead at fiber grating pair sensor both ends in the double-core optical fiber connector fixed at dies cavity both ends with burying joint
3 connections.Melt polypropylene is poured into a mould into mould, die sinking is to obtain the light that shaft-like end carries double-core optical fiber connector after cooling
Fine grating is to sensor insert 6.
(4) in core plate molding or injection mold cavity surface according to the fiber grating pair rod shaped support 4 after shaft-like encapsulation
Quantity preset mounting hole.The rod shaped support 4 of shaft-like fiber grating pair sensor insert and default mounting hole on mould are matched somebody with somebody
Close.Joint will be buried in the joints of optical fibre of inserts end with block head to coordinate.
(5) van-type membrane filter plate core plate is prepared using mould pressing process, realizes membrane filter plate core plate and shaft-like fiber grating pair
Sensor insert is integrally formed.
(6) after the compression molding of van-type membrane filter plate core plate, by fiber grating pair sensor of the excessive residual outside core plate
The rod shaped support 4 of inserts is removed and polished flat.
(7) core plate after being molded is removing block head after follow-up machining, each twin-core fiber at both ends
The corresponding ports that joint connects fiber coupler respectively are buried in connector, fiber coupler passes through intelligent acess fiber grating demodulation
Instrument, fiber Bragg grating (FBG) demodulator connect computer by netting twine, the health monitoring systems software for having processing fiber grating data in computer,
Geometry three-dimensional modeling, output display damage profile.
The embodiment two a kind of online health monitoring device of core plate and method of middle charging van-type membrane filter plate
As shown in figure 4, system includes：The unidirectional wire fiber Bragg gratings of thin rod shape are two-way to sensor insert, thin rod shape
Wire fiber Bragg gratings are to sensor insert, fiber coupler, optical fibre grating digital demodulation instrument, computer system etc..
The unidirectional wire fiber Bragg gratings of thin rod shape are to the encapsulation structure of inserts 10 as shown in Fig. 2 each fiber grating only has
One end lead, convenient the arranging around the charging hole of membrane filter plate core plate middle position of fiber grating of unidirectional lead.
(1) van-type membrane filter plate core plate shape and structure feature and size are fed in, scribes 22 two-way lead bags
The optical fiber of 40 μm of diameter of layer scribes grating.The raster unit of 10 different centre wavelengths, numbering 1-10 are scribed on every optical fiber.Take
Two have been scribed optical fiber composition fiber grating pair, and it is 1-11 to number, temperature survey grating outer casing stainless steel steel pipe, mouth of pipe glue
Envelope, labeled as T, strain grating marker is S.
(2) optical fiber for scribing 8 unidirectional 40 μm of lead cladding diameters scribes grating.Scribed on every optical fiber in 5 differences
The raster unit of cardiac wave length, numbering 1-5.Two are taken to scribe optical fiber composition fiber grating pair, and it is 12-15 to number, temperature is surveyed
Grating outer casing stainless steel steel pipe is measured, mouth of pipe glue envelope, labeled as T, strain grating marker is S.
(3) to two-way wire fiber grating to being packaged, joint will be buried in double-core optical fiber connector and is pre-installed on encapsulation
The both ends of mould, it is that two optical fiber of 1-11 are fixed in thin rod shape encapsulating mould by numbering, keeps the raster unit position of two optical fiber
Put correspondingly, two optical fiber are at a distance of 10mm, the lead at fiber grating pair sensor both ends and the twin-core light fixed at dies cavity both ends
Joint connection is buried in fiber connector.Melt polypropylene is poured into a mould into mould, die sinking is to obtain the two-way lead of thin rod shape after cooling
End carries the fiber grating pair sensor insert 6 of double-core optical fiber connector.
(4) to unidirectional wire fiber grating to being packaged, joint will be buried in double-core optical fiber connector and is pre-installed on encapsulation
One end of mould, two optical fiber for being 12-15 will be numbered and be fixed in thin rod shape encapsulating mould, keep the raster unit of two optical fiber
Position correspondence, two optical fiber are at a distance of 10mm, the lead of fiber grating pair sensor one end and the twin-core fixed in dies cavity one end
Joint connection is buried in the joints of optical fibre.Melt polypropylene is poured into a mould into mould, die sinking is to obtain thin rod shape unidirectionally to draw after cooling
Thread end carries the fiber grating pair sensor insert 10 of double-core optical fiber connector.
(5) end of the fiber grating pair rod shaped support 4 after shaft-like encapsulation is bonded on mould realizes it in a mold
Fixation.Unidirectional wire fiber grating is arranged to sensor insert 10 around the charging hole of core plate middle position.By inserts end
The joints of optical fibre in bury joint and block head and coordinate.
(6) van-type membrane filter plate core plate is prepared using mould pressing process, realizes membrane filter plate core plate and shaft-like fiber grating pair
Sensor insert is integrally formed.
(7) after the compression molding of van-type membrane filter plate core plate, by fiber grating pair sensor of the excessive residual outside core plate
The rod shaped support of inserts is removed and polished flat.
(8) core plate after being molded is removing block head after follow-up machining, each double-core optical fiber connector
The corresponding ports that joint connects fiber coupler respectively are inside buried, fiber coupler passes through intelligent acess fiber Bragg grating (FBG) demodulator, light
Fine grating demodulation instrument connects computer by netting twine, and unsoundness monitoring system software handles fiber grating data in computer, and three-dimensional is built
Mould, output display damage profile.
Although above-mentioned the embodiment of the present invention is described with reference to accompanying drawing, model not is protected to the present invention
The limitation enclosed, one of ordinary skill in the art should be understood that on the basis of technical scheme those skilled in the art are not
Need to pay various modifications or deformation that creative work can make still within protection scope of the present invention.
Claims (8)
1. a kind of core plate on-line monitoring system of membrane filter plate, it is characterized in that：Including fiber Bragg grating (FBG) demodulator, fiber coupler,
Processor and fiber-optic grating sensor component, wherein, fiber-optic grating sensor component is arranged in core plate, and light source sends light letter
Number, optical signal is transferred to fiber-optic grating sensor component by fiber coupler, after optical signal interacts with fiber grating, instead
Penetrate light and enter fiber Bragg grating (FBG) demodulator, fiber Bragg grating (FBG) demodulator connection processor by fiber coupler；
The fiber-optic grating sensor component, includes the fiber grating pair sensor insert of several columns, and the fiber grating pair passes
Sensor inserts, including optical fiber temperature grating and strain fiber grating, optical fiber temperature grating are used for measurement temperature, strain fiber grating
For measuring strain, optical fiber temperature grating is parallel with strain fiber grating, arranged adjacent, each temperature in optical fiber temperature grating
Raster unit and each strain raster unit of strain fiber grating correspond；
The end of the fiber grating pair sensor insert is provided with the interior of the joints of optical fibre and buries joint, and fiber grating pair sensor is embedding
Several rod shaped supports are distributed with part, to realize the positioning and fixation of inserts in a mold in molding, injection molding process,
The rod shaped support is engaged with default mounting hole on core plate mould or the end of rod shaped support is adhesively fixed on mould.
2. a kind of core plate on-line monitoring system of membrane filter plate as claimed in claim 1, it is characterized in that：The optical signal passes through
One fiber coupler is transferred to one end of fiber-optic grating sensor component, forms one and has the incident end with light reflection of light concurrently
Mouthful；The fiber coupler has one or two, and optical signal is divided into all the way or two-way, passes through one or two respectively
Fiber coupler is transferred to one end or both ends of fiber-optic grating sensor component, forms one or two ports.
3. a kind of core plate on-line monitoring system of membrane filter plate as claimed in claim 1, it is characterized in that：The fiber grating pair
Sensor insert is fixed on the dies cavity of core plate, is integrally formed in molding or injection moulding process with core plate.
4. a kind of core plate on-line monitoring system of membrane filter plate as claimed in claim 1, it is characterized in that：Described fiber grating
Sensor insert is prepared by thermoplastic encapsulation technology, will be buried in core plate structure with double-core optical fiber connector
The one or both ends that joint is pre-installed on encapsulating mould are inside buried, fiber grating is opposite in encapsulating mould, and heat injection is poured into mould
Thermoplastic plastic melt, die sinking is to obtain fiber grating of the end with double-core optical fiber connector of thermoplastic encapsulation after cooling
To sensor insert.
5. a kind of core plate on-line monitoring system of membrane filter plate as claimed in claim 1, it is characterized in that：The processor includes
Fiber grating signal resolution module, core plate damage data library module, CAD modeling modules, CAE finite element analysis modules, core plate are good for
Health total evaluation module and display output module, wherein, the fiber grating signal resolution module, for parsing fiber grating solution
Adjust the signal of instrument collection；The core plate damage data library module, for storing core plate damage data；The CAD modeling modules, use
In the 3-D geometric model for establishing core plate；The CAE finite element analysis modules, for simulation calculation core plate degree of injury；It is described
Core plate health total evaluation module, the health condition for the damage profile condition evaluation filter plate according to core plate；The display is defeated
Go out module, for showing the 3-D geometric model and health condition of core plate.
6. a kind of method of the monitoring system based on as any one of claim 1-5, it is characterized in that：Including following step
Suddenly：
(1) raster unit is scribed according to the structure of the core plate of membrane filter plate and monitoring needs, and each raster unit is numbered,
Two fiber gratings of selection set up fiber grating pair；
(2) to burying joint in fiber grating pair sensor and double-core optical fiber connector using thermoplastic melt cast
Mode is packaged in encapsulating mould, obtains fiber grating pair sensor insert；
(3) membrane filter plate core plate is prepared using molding or Shooting Technique, realizes membrane filter plate core plate and fiber grating pair sensing
Device inserts is integrally formed；
(4) joint is buried in the double-core optical fiber connector the one or both ends of each fiber grating pair sensor insert respectively to connect
The corresponding ports of fiber coupler are connect, fiber coupler is led to by intelligent acess fiber Bragg grating (FBG) demodulator, fiber Bragg grating (FBG) demodulator
Data wire connection signal processor is crossed, the signal of signal processor parsing fiber Bragg grating (FBG) demodulator collection, core plate temperature is solved, answers
Change and stress；
(5) 3-D geometric model of the core plate of membrane filter plate is established, the degree of injury of core plate is calculated using finite element method,
Judge whether core plate damages, if damaging, judge damage position and degree of injury, output damage, and then evaluate core
Plate health degree.
7. method as claimed in claim 6, it is characterized in that：In the step (3), it is molded or is molded in membrane filter plate core plate
Before shaping, mounting hole is preset according to the rod shaped support quantity of the fiber grating pair sensor insert after encapsulation in dies cavity,
Default mounting hole in the rod shaped support and dies cavity of fiber grating pair sensor insert is coordinated, or by rod shaped support end
Viscose glue connects fixation and realizes the fixation of inserts in a mold；Joint will be buried in the joints of optical fibre of inserts end with block head to match somebody with somebody
Close；After core plate molding or injection molding, by the bar-shaped branch of fiber grating pair sensor insert of the excessive residual outside core plate
Support is removed, and core plate surface is polished flat.
8. method as claimed in claim 6, it is characterized in that：In the step (5), specific steps include：
(5-1) establishes the 3-D geometric model of membrane filter plate core plate using CAD modeling softwares, and it is soft to import CAE finite element analyses
Part, grid division, establish FEM model；
(5-2) establishes unit e in FEM model according to locus corresponding relationxkjWith raster unit xkj corresponding relation：The temperature of grating measuring, strain and stress are mapped in FEM model, carry out temperature field and the stress of core plate
The finite element modelling of strain field；
The signal that the transmission of (5-3) processor reception optical fiber grating demodulation instrument comes, and count dead grating numbering；
Corresponding damage data model after (5-4) is handled the grating xkj signals received and in core plate damage data storehouse
Whether contrast, the core plate of diagnosis grating cell position occur damage and degree of injury, establish raster unit and core plate damage journey
Relation between degree：xkj→d(xkj)；
(5-5) combines step (5-2), (5-4), and the raster unit group obtained in FEM model damages during health monitoring
Hinder the variation relation of degree：e(xkj)→d(xkj), institute in the finite element modelling result and step (5-4) of comparative analysis degree of injury
The diagnostic result obtained, enrich, the damage data storehouse of optimization core plate, then pass through the distribution shape that cloud atlas exports core plate degree of injury
State；
(5-6) estimates the security and service life of core plate, sends alarm in time, improve membrane filter plate core according to degree of injury
The usage security of plate.
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| CN106404066B (en) * | 2016-10-10 | 2019-09-03 | 山东大学 | External labeling type fiber-optic grating sensor, detection system and method applied to membrane filter plate |
| CN106441383B (en) * | 2016-10-10 | 2019-08-23 | 山东大学 | A kind of Active spurring formula filter press filter board health detecting system based on optical fiber grating sensing |
| CN106248150B (en) * | 2016-10-10 | 2019-09-17 | 山东大学 | External labeling type fiber-optic grating sensor, detection system and method applied to chamber filter plate |
| CN109341558A (en) * | 2018-09-26 | 2019-02-15 | 大连海事大学 | A kind of pelagic trawler tail-gate frame structure monitoring system |
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| CN202693856U (en) * | 2012-06-26 | 2013-01-23 | 中国航空工业集团公司北京航空材料研究院 | Miniature optical fiber connector embedded in composite material structure |
| CN104596434A (en) * | 2013-10-30 | 2015-05-06 | 北京强度环境研究所 | Fiber bragg grating high-temperature stress testing device and mounting method of device |
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| CN105158256A (en) * | 2015-09-30 | 2015-12-16 | 山东大学 | Online health monitoring system and method for composite material |
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| CN202693856U (en) * | 2012-06-26 | 2013-01-23 | 中国航空工业集团公司北京航空材料研究院 | Miniature optical fiber connector embedded in composite material structure |
| CN104596434A (en) * | 2013-10-30 | 2015-05-06 | 北京强度环境研究所 | Fiber bragg grating high-temperature stress testing device and mounting method of device |
| CN105043458A (en) * | 2015-09-17 | 2015-11-11 | 山东大学 | Device and method for on-line detection of lightning damage of fiber composite material |
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