CN109406036A - Monitor the system and method for wind-driven generator bolt fastening stress on-line - Google Patents
Monitor the system and method for wind-driven generator bolt fastening stress on-line Download PDFInfo
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- CN109406036A CN109406036A CN201811474252.2A CN201811474252A CN109406036A CN 109406036 A CN109406036 A CN 109406036A CN 201811474252 A CN201811474252 A CN 201811474252A CN 109406036 A CN109406036 A CN 109406036A
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- 238000000034 method Methods 0.000 title claims abstract description 32
- 238000012544 monitoring process Methods 0.000 claims abstract description 113
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- 238000004804 winding Methods 0.000 claims description 22
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- 230000015556 catabolic process Effects 0.000 abstract description 3
- 230000003862 health status Effects 0.000 abstract description 3
- 238000002604 ultrasonography Methods 0.000 abstract description 2
- 238000005259 measurement Methods 0.000 description 7
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- 238000011897 real-time detection Methods 0.000 description 2
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L5/00—Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes
- G01L5/24—Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes for determining value of torque or twisting moment for tightening a nut or other member which is similarly stressed
- G01L5/246—Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes for determining value of torque or twisting moment for tightening a nut or other member which is similarly stressed using acoustic waves
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Abstract
The present invention provides a kind of system and method for monitoring wind-driven generator bolt fastening stress on-line, including monitoring probe, temperature sensor, data acquisition process equipment and monitoring system.By the accurate positionin to specific blower, blade and bolt, realize that the accurate location to specific a certain bolt monitors；The fastening stress of the whole circle attachment bolt in fan blade root by monitoring the wind-driven generator of ultrasound examination in real time, and strain error caused by the temperature change based on bolt local environment is corrected, to obtain the accurate practical fastening stress of a certain bolt, judge whether bolt occurs loosening or crack conditions, and early warning and breakdown judge are carried out in time, it allows operation maintenance personnel that can grasp blade root bolt health status at any time, has filled up current blank of the wind-power electricity generation machine bolt without on-line real time monitoring system.
Description
Technical field
The present invention relates to wind-driven generator monitoring technical fields, it particularly relates to a kind of on-line monitoring wind-driven generator
The system and method for bolt fastening stress.
Background technique
Wind-power electricity generation is the extensive important channel for utilizing renewable new energy, with the swift and violent hair of global Wind Power Generation Industry
Exhibition, installation scale and single-machine capacity constantly expand.Wind electricity blade is the core component of wind-driven generator capture wind energy, is mostly used
10.9 grade high-strength bolts couple with host.The attachment bolt of wind electricity blade bears alternating load in operation, service load is big,
Stress is complicated, often leads to running of wind generating set accident due to vibration loosens, fatigue is even broken, causes to country and enterprise huge
Economic loss.Further, since running of wind generating set failure caused by the factors such as bolt installation operation is lack of standardization, bolt is of poor quality
Also commonplace.Early stage installation Wind turbines, bolt-connection part come into loss the period, therefore caused failure also by
It fades in existing.Currently, each wind field operation maintenance personnel only inspects periodically bolt, accident potential often is left because of human error.
In existing wind power generating set, the effective hand for integrating working bolt status real time monitor and fault analysis and diagnosis is also lacked
Section and equipment.
CN201310378100.3 provides a kind of method for measuring bolt group pretightening force, it overcomes existing common axle power
The deficiency that meter tools for bolts ' pretension force measuring device can only use single threaded fastener, can measure the pretightning force of multiple bolts,
But it is unable to the pretightning force of the monitoring bolt of real-time online.CN201310235117.3 discloses a kind of prison for capableing of real-time online
The new method for surveying bolt pretightening, by being measured in fastener and by a threaded fastener pretightning force is installed between securing objects
Device carrys out the variation of monitoring bolt pretightning force, but this method is unfavorable for the measurement of small-sized bolt pretightening.
CN200720087776.7 measure pretightning force principle it is similar to CN201310235117.3, but be by gasket sensor come
The variation of pretightning force is monitored, but due to the size of bolt and is not fixed, pretightening force measuring apparatus needs special customized to meet
The needs of measurement.CN201320360112.9 provides a kind of pretightning force measuring mechanism, including measuring device, driving device and is
Driving device provides the power device of power, and this method is a kind of method for actively measuring pretightning force, rather than monitors connection knot
The method of pretightning force situation of change under structure normal service state.By the object of foregoing invention and utility model it is found that without special
Door is directed to wind-driven generator bolt fastening stress monitoring system and monitoring method.
Summary of the invention
For above-mentioned technical problem in the related technology, the present invention provides a kind of on-line monitoring wind-power electricity generation machine bolt is tight
Gu the system and method for stress is sent out by the fastening stress of each specific bolt of real time on-line monitoring wind-driven generator for wind-force
The fault analysis and diagnosis of motor provides effective means and equipment.
To realize the above-mentioned technical purpose, the technical scheme of the present invention is realized as follows:
On the one hand, the present invention provides a kind of system for monitoring wind-driven generator bolt fastening stress on-line, including is mounted on
The monitoring probe of end of the whole circle attachment bolt of the root of blade of wind-driven generator, magnetic are in root of blade round linking bolt
Temperature sensor, the data acquisition process equipment connecting with monitoring probe and temperature sensor and monitoring wind-driven generator are each
The monitoring system of a bolt pretightening；
Wherein the data acquisition process equipment includes data processing system, for blower information, bolt information, monitoring
Probe and the data of temperature sensor acquisition carry out data processing and analysis；
The monitoring system is used to calculate upload data, calculates bolt pretightening and temperature-compensating, judges to pre-tighten
Whether power is in normal range (NR), to issue corresponding warning information.
Further, the monitoring probe includes the whole circle attachment bolt of root of blade, winding device, coupling layer, ultrasonic wave
Sensor and sensor terminals；
The winding device successively includes mounting hole, nested hole and bolt hole from top to bottom；
The protrusion outer rim of the ultrasonic sensor probe bottom is nested in winding device nesting hole；
The ultrasonic sensor ontology is installed through in mounting hole；
The coupling layer is coated in ultrasonic sensor probe bottom, and connects with the whole circle attachment bolt end face of root of blade
Touching；
The whole circle attachment bolt of root of blade is threadedly coupled with the bolt hole of winding device；
The sensor terminals setting is connect in ultrasonic sensor, and with data acquisition process equipment；For supervising
Survey bolt pretightening.Monitoring bolt pretightning force is based on ultrasonic longitudinal wave Sound elasticity principle, i.e., when isotropic solid material is by certain
When one direction stress and ultrasonic wave consistent with stress direction, the velocity of sound and stress are linear relationship.
Further, several described monitoring probes form monitoring probe array.
Further, the blower information includes between blower number, IP address, blower IP address, operation duration, operation
Every, blade parameter, remark information etc..
Further, the blade parameter includes blade number, leaf harvest port number, threshold voltage, yield value, acquisition
Average value number, acquisition time interval etc..
Further, the bolt information include bolt specification, bolt position number, monitoring probe installation number, calibration information,
Bolt, which clamps partial-length, the specified preload force information of bolt, bolt, allows pretightning force deviation range etc..
Further, information, temperature information when the upload data include blower number, blade number, bolt position number, sound
Deng.
Further, the ultrasonic sensor at least 8, and uniformly it is mounted on the whole circle attachment bolt of root of blade
End.
Further, the supersonic sensing implement body installation process is as follows:
I ultrasonic sensor probe bottom) is coated into coupling glue to form coupling layer；
II) step I) resulting part is pressed in the end face of the whole circle attachment bolt of root of blade, winding device passes through from top to bottom
It wears and is nested on ultrasonic sensor, and tighten until cannot rotate again；
III) connection sensor terminals and channel collector complete installation.
On the one hand, the present invention provides a kind of method for monitoring wind-driven generator bolt fastening stress on-line, including walks as follows
It is rapid:
1) blower information, bolt information are added to on-line monitoring system；
2) blower information, bolt information, starting on-line monitoring, the upload number that monitored data acquiring and processing device provides are read
According to；
3) the upload data about blower and bolt monitored are parsed, calculates bolt pretightening and temperature is mended
It repays, judges whether pretightning force in normal range (NR) and makes early warning, save data；If continuing to monitor without data are uploaded.
Further, the normal range (NR) refers to that the fastening stress and blade gravity of bolt and blower in static state are superimposed
State analysis model out；Or the fastening stress and the superposition of blade gravity of bolt and blower in static state, it is aided with practical normal fortune
The comprehensive state analysis model obtained of stress value when turning.
Further, in step 3), it is as follows carries out resolving: intercepting the period to be analyzed, it is pre- to judge whether there is bolt
Clamp force information record: if nothing, the period to be analyzed is replaced；If so, it is pre- to import the corresponding bolt of the period blower to be analyzed
Clamp force record, in conjunction with blower type or bolt information, reading state analysis model；According to bolt pretightening record, state analysis
Model and monitoring data analyze the stress anticipation and tendency of fan monitoring position entirety bolt, and provide Intervention Advice, judge.
Further, whether in step 3), judge pretightning force in normal range (NR): not in normal range (NR), early warning alarms, writes
Abnormal log saves abnormal log, intervenes report, into preservation interface；In normal range (NR), force information will be pre-tightened and shown in correspondence
Fan monitoring unit interface saves acquisition data, replaces the period to be analyzed.
Beneficial effects of the present invention:
The present invention provides a kind of system and method for monitoring wind-driven generator bolt fastening stress on-line, by monitoring system
Accurate positionin to specific blower, blade and bolt realizes that the accurate location to specific a certain bolt monitors；By supervising in real time
The fastening stress of the whole circle attachment bolt in fan blade root of the wind-driven generator of ultrasound examination is controlled, and based on bolt local environment
Strain error caused by temperature change is corrected, to obtain the accurate practical fastening stress of a certain bolt, judges spiral shell
Whether bolt occurs loosening or crack conditions, and carries out early warning and breakdown judge in time, allows operation maintenance personnel that can grasp blade root spiral shell at any time
Bolt health status has filled up current blank of the wind-power electricity generation machine bolt without on-line real time monitoring system.
Monitoring probe of the invention is axially answered using ultrasonic sensor according to Sound elasticity principle real-time detection bolt fastening
Power, can not destroy bolt arrangement, do not influence bolt and tighten and disassembling operations.
Ultrasonic sensor installation of the invention stablizes, and can also fit closely with tested bolt, can guarantee that bolt is pre-
Exact requirements when clamp force detects, reduce the error of test result, or even avoid the mistake of test result.
The present invention is by providing the bolt monitoring of wind power generating set, conducive to the uptime for increasing wind power plant, drop
The maintenance cost of low sharp generating set provides the safety of wind power generating set operation.
Detailed description of the invention
It in order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, below will be to institute in embodiment
Attached drawing to be used is needed to be briefly described, it should be apparent that, the accompanying drawings in the following description is only some implementations of the invention
Example, for those of ordinary skill in the art, without creative efforts, can also obtain according to these attached drawings
Obtain other attached drawings.
Fig. 1 is the structural schematic diagram of the monitoring probe of the preferred embodiment of the present invention.
Fig. 2 is the winding device the schematic diagram of the section structure of the preferred embodiment of the present invention.
Fig. 3 is that the bolt of the preferred embodiment of the present invention installs the structural schematic diagram of site arrangement.A expression is mounted with that monitoring is visited
The bolt site of head；B indicates the bolt site for not installing monitoring probe.
Fig. 4 is the bolt time-varying stress diagrams of the preferred embodiment of the present invention.
Fig. 5 is the system topological figure of the preferred embodiment of the present invention.6A probe；The channel 6B collector；6C communication controller；6D
Master controller；6E network management platform；The power station 6F work station；The cloud 6G, background service；6H remote supervisory station；Inside 6I head；
6J blower interior.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, those of ordinary skill in the art's every other embodiment obtained belong to what the present invention protected
Range.
Unless otherwise defined, all technical terms used hereinafter and the normally understood meaning of those skilled in the art
It is identical.Technical term used herein is intended merely to the purpose of description specific embodiment, is not intended to the limitation present invention
Protection scope.
Embodiment 1
As shown in Fig. 1~5, the present invention provides a kind of system for monitoring wind-driven generator bolt fastening stress on-line, including
The monitoring probe of end that is mounted on the whole circle attachment bolt of root of blade of wind-driven generator, magnetic are in root of blade round linking
The temperature sensor of bolt, the data acquisition process equipment being connect with monitoring probe and temperature sensor and monitoring wind-force hair
The monitoring system of each bolt pretightening of motor；Data acquisition process equipment includes channel collector and/or communication controller；
Wherein the data acquisition process equipment includes data processing system, for blower information, bolt information, monitoring
Probe and the data of temperature sensor acquisition carry out data processing and analysis；
The monitoring system is used to calculate upload data, calculates bolt pretightening and temperature-compensating, judges to pre-tighten
Whether power is in normal range (NR), to issue corresponding warning information；Monitoring system includes monitor supervision platform (master controller), network pipe
Platform, power station work station, cloud/background server, remote supervisory station；
The monitoring probe includes the whole circle attachment bolt 1 of root of blade, winding device 2, coupling layer 3, ultrasonic sensor 4
With sensor terminals 5；The winding device 2 successively includes mounting hole 21, nested hole 22 and bolt hole 23 from top to bottom；It is described
21 internal diameter of mounting hole is less than 22 internal diameter of nested hole, and it is embedding to guarantee that the protrusion outer rim of ultrasonic sensor probe bottom can be nested in this
In sets of holes 22, ultrasonic sensor 4 can be fixed in mounting hole 21, realize the fixed installation of ultrasonic sensor 4；Institute
Stating the whole 1 surface magnetic of circle attachment bolt of root of blade has temperature-compensating sensor；Temperature-compensating is with sensor magnetic in screw rod
Any part can sense screw rod or ambient temperature, no special mounting requirement；For monitoring bolt pretightning force.It is described super
The protrusion outer rim of the probe of sonic sensor 4 bottom is nested in winding device nesting hole 22；4 ontology of ultrasonic sensor passes through
It wears and is mounted in mounting hole 21, realize the fixed installation of ultrasonic sensor；23 internal diameter of bolt hole is less than in nested hole 22
Diameter guarantees the contact of the probe of ultrasonic sensor 4 bottom and bolt 1 with this, and it is convex that the internal diameter in nested hole 22 can meet different size
The demand of outer rim out；21 internal diameter of mounting hole is less than 23 internal diameter of bolt hole, realizes the fixed installation of ultrasonic sensor 4, mentions
The stability of height installation；The coupling layer 3 is coated in 4 bottom of ultrasonic sensor probe, and couples spiral shell with the whole circle of root of blade
The contact of 1 end face of bolt, realize between ultrasonic sensor probe and the whole circle attachment bolt of root of blade by the coupling glue of coupling layer/
Couplant is coupled；The whole circle attachment bolt 1 of root of blade is threadedly coupled with the bolt hole 23 of winding device 2, passes through rotation
Turn winding device and realizes the whole fastening enclosed between attachment bolt 1 and ultrasonic sensor probe 4 of root of blade；The bolt hole 23
Inside it is provided with the screw thread to match with the whole circle attachment bolt 1 of root of blade；The sensor terminals 5 are arranged in ultrasonic wave
In sensor 4, and it is connect with channel collector；It realizes and the long-time of pretightning force is monitored；Nesting 22 internal diameter of hole is greater than institute
The outer diameter for stating the protrusion outer rim of the probe of ultrasonic sensor 4 bottom, guarantees the stability of installation；The depth in the nesting hole 22 is big
In the thickness of the protrusion outer rim of the ultrasonic sensor 4 probe bottom, guarantee the stability of installation；The winding device 2
Periphery is provided with anti-skid chequer, and the structure of the winding device 2 is in hexahedron shape or ring-type, is easily installed fastening.
Several described monitoring probes form monitoring probe array, it is preferable that and the ultrasonic sensor at least 8,
And uniformly it is mounted on the end of the whole circle attachment bolt of root of blade, (as shown in Figure 3).Pass through the uniform row of monitoring probe array
Cloth, conducive to the stress for uniformly detecting blade root bolt in real time.Monitoring bolt pretightning force is worked as based on ultrasonic longitudinal wave Sound elasticity principle
When isotropic solid material is by a direction stress and ultrasonic wave consistent with stress direction, the velocity of sound and stress are linear relationship.
Strain error caused by temperature change is based on by data processing equipment to be corrected, it is quasi- to obtain the practical pretightning force of bolt
The really stress condition of monitoring bolt, improves the precision of monitoring.
The blower information includes blower number, IP address, blower IP address, operation duration, interval, blade ginseng
Number, remark information etc.；The blade parameter includes blade number, leaf harvest port number, threshold voltage, gain refers to, acquisition is put down
Mean value number, acquisition time interval etc.；The bolt information includes bolt specification, bolt position number, monitoring probe installation number, mark
Determining information, bolt clamping partial-length, the specified preload force information of bolt, bolt allows pretightning force deviation range etc.；By to wind
Machine, blade, bolt are properly positioned, and conducive to the situation of the specific bolt for the specific blade for acquiring specific blower, are convenient for
Service personnel directly overhauls, and promotes overhaul efficiency.
Information, temperature information etc. when the upload data include blower number, blade number, bolt position number, sound.
The specific course of work is as follows:
It is pressed against firstly, coating coupling glue in the probe of ultrasonic sensor 4 bottom is formed coupling layer 3 after coating is uniform
It is realized by winding device 2 from bottom to up through being nested on ultrasonic sensor 4 end face of the whole circle attachment bolt 1 of root of blade
Nested hole 22 be just nested in ultrasonic sensor 4 pop one's head in bottom protrusion outer rim on, then screw clockwise winding device 2 with
The whole circle attachment bolt 1 of root of blade, realizes the fixed installation of ultrasonic sensor, guarantees the stability of data monitoring；It will sensing
Device terminals 5 are connect with data acquisition process equipment.
Before monitoring, when blade of wind-driven generator is in vertical position, eight spies on the blade bolt are uniformly installed
Head pre-tightens the whole bolts of whole circle with hydraulic torque spanner, and the bolt static state fastening stress of eight probe detections is almost the same at this time,
For being superimposed for fastening stress and blade gravity.
The method for monitoring wind-driven generator bolt fastening stress on-line, includes the following steps:
1) by blower information (including blower number, IP address, blower IP address, operation duration, interval, blade join
Number, remark information etc.；Blade parameter includes that blade number, leaf harvest port number, threshold voltage, gain refer to, acquire average value
Number, acquisition time interval etc.), bolt information (including bolt specification, bolt position number, monitoring probe installation number, calibration letter
Breath, bolt clamping partial-length, the specified preload force information of bolt, bolt allow pretightning force deviation range etc.) it is added to online prison
Examining system is stored in database；
2) blower information, bolt information, starting on-line monitoring, the upload number that monitored data acquiring and processing device provides are read
According to；
3) parse the upload data about blower and bolt monitored, resolving is as follows: interception is to be analyzed
Period judges whether there is tools for bolts ' pretension force information record: if nothing, replacing the period to be analyzed；If so, importing described to be analyzed
The corresponding bolt pretightening record of period blower, in conjunction with blower type or bolt information, reading state analysis model；According to spiral shell
Bolt pretightning force record, state analysis model and monitoring data analyze the stress anticipation of fan monitoring position entirety bolt and walk
Gesture, and provide Intervention Advice；Bolt pretightening and temperature-compensating are calculated, judges pretightning force whether in normal range (NR): not normal
Range, early warning alarm, write abnormal log, save abnormal log, intervene report, into preservation interface；It, will be pre- in normal range (NR)
Clamp force information is shown in corresponding fan monitoring unit interface, saves acquisition data, replaces the period to be analyzed；If without number is uploaded
According to continuing to monitor.
During monitoring, all data of monitoring are handled and are generated report, and guidance staff ties up in time
Shield.Staff oneself can also judge the number trend of each bolt according to data sheet, find to hide accident point in time, in advance
It is safeguarded.
The normal range (NR) refers to that the fastening stress and blade gravity of bolt and blower in static state are superimposed the state obtained
Analysis model；Or the fastening stress and the superposition of blade gravity of bolt and blower in static state, answering when being aided with practical normal operation
The comprehensive state analysis model obtained of force value.There are two types of value modes for normal range (NR): 1) when wind-driven generator is static, at each blade
In fixed static position, there is static pretightning force not of uniform size on every bolt at this time, measurement data and history when will be static
Comparing, discovery difference then illustrate that bolt has the abnormal conditions such as loosening or fracture, can determine whether out abnormal feelings according to size of the difference
The urgency level of condition；2) when wind-driven generator operates, the fastening of the every monitoring bolt of automatic measurement of system meeting at regular intervals
(fastening stress of every bolt is dynamic change to stress changing curve when operating, is presented as pretightning force, wind load, gravity
The superposition of load and centrifugal force load), and experiment curv is compared with history normalized curve, comparison result is in normal range (NR)
It does not alarm then inside, deviates history normal value and illustrate that bolt has loosening, crack conditions, be can determine whether out according to the size of deviation value abnormal
The urgency level of situation, and then alarm.
In the whole circle attachment bolt of wind power generator blade root choose 8 (be not limited to 8, can also be more, more prisons
Measured data is finer) bolt installation ultrasonic wave stress monitoring probe.The plug-in of measuring system can be according to 8 probe monitors numbers
According to variation judge it is whole circle bolt coupled situation.If certain root bolt looseness or fracture, the stress curve of 8 monitoring points will be sent out
Changing, this variation with the loosening of bolt or fracture be it is corresponding, monitor system by built in this corresponding relationship, therefore
Monitoring system can be according to abnormal conditions such as the anti-loosening fractures for releasing bolt of variation of 8 data of monitoring point, and then alarm.
Regardless of whether having bolt looseness or fracture, these monitoring data are all to pass cloud/background server back and store
, future can be used as the foundation of blower Curve guide impeller.
As shown in figure 4, a certain bolt and state analysis model (time-varying stress diagrams) of the blower in static state where it.
It is monitored in actual motion, constantly improves state analysis model, and then form the state analysis model of practical experience,
In the specific period, the contrast model of the normal range (NR) as on-line monitoring system.Once there is the pre- of a certain bolt monitoring
Obviously deviating, which also occurs, in the bolt that clamp force obviously deviates and its periphery is adjacent (is presented as pretightning force beyond allowable stress value [σ]
(highest standard value or being lower than minimum standard value), a certain bolt is got loose or fatigue fracture, this bolt and remaining bolt are held
The fastening stress variation received and the range beyond permissible value, monitoring system receive data, the bolt fastening that real-time measurement is drawn
Stress curve and history curve compare, and real-time measurement curve shifts), it is judged as abnormal, and obtaining as abnormal data need to
Very important person is the intervention report for repairing inspection, carries out positioning when can shut down next time and repairs inspection.If continuous occur repeatedly intervening report, reported
It is alert, need emergency shutdown to be handled.Safety alarm is at least divided into two-stage, and second level is general danger, shuts down in wind-driven generator
When disposed；Primary alarm is substantial risk, should hard stop disposition.Warning or fault-signal can represent a certain bolt and go out
It now loosens or fatigue fracture；Wind power generating set operation maintenance personnel can take corresponding Disposal Measures according to bolt looseness degree, such as pine
It is dynamic little, respective bolt can be carried out to tighten operation when shutting down next time；It, can if loosening is excessive or even is judged as fracture defect
It shuts down in time and maintenance is tightened or replaced to bolt.
To Mr. Yu's type wind-driven generator, Laboratory Calibration obtain model bolt stress coefficient and temperature compensation coefficient (
Stress error deviation amount caused by test temperature under different temperatures is used for correction factor).Actual measurement is to certain bolt ultrasonic longitudinal wave
Its practical stress value born can be calculated when sound.Using 2KHz frequency sampling, allergic effect when can monitor and draw the bolt
Force curve, as shown in figure 4, then curve is more fine for sample frequency height, sample frequency is low, and lines are the curves substantially approached.It adopts
Sample frequency does not reflect bolt looseness directly, and the bolt fastening stress curve sampled out will be compared with history curve: if a certain monitoring
Point bolt loosens, then deviates bigger；It is two neighboring if the bolt between certain two monitoring point gets loose or is broken
Changes will occur for the bolt fastening stress of monitoring point, bigger with the closer monitoring point variation of quick-release bolt.
As shown in figure 3, uniformly installing 8 monitoring probes (being not limited to 8) along the whole circle bolt of blade root.When any bolt
It loosening or fracture, the axial load born reduces even zero, these axial loads will be shared by the bolt closed on, because
And cause monitoring point bolt axial load that corresponding change occurs.It can the whole circle bolt work of real-time judge after system monitoring to these variations
Make state, issues bolt looseness or fracture early warning.
Monitoring probe of the invention sets installation by the card of winding device, so that ultrasonic sensor ontology is mounted on installation
In hole；It is realized by the nested hole of winding device and the nesting of ultrasonic sensor is installed；By the bolt hole of winding device with
The fixation by ultrasonic sensor between the whole circle attachment bolt of root of blade is realized in the fastening of the whole circle attachment bolt of root of blade
Installation, guarantees the stability of coupling layer thickness, is to be connected through a screw thread realization due to being fixedly mounted, and guarantees continuing unanimously for pressure
Property.
Wind-driven generator bolt fastening stress monitoring system provided by the invention and monitoring method, by monitoring wind-force in real time
The fastening stress of the whole circle attachment bolt in the fan blade root of generator judges whether bolt occurs loosening or crack conditions, and in time
Early warning and breakdown judge are carried out, allows operation maintenance personnel that can grasp blade root bolt health status at any time, has filled up current wind-driven generator
Blank of the bolt without on-line real time monitoring system.
Monitoring probe of the invention is axially answered using ultrasonic sensor according to Sound elasticity principle real-time detection bolt fastening
Power, can not destroy bolt arrangement, do not influence bolt and tighten and disassembling operations.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all in essence of the invention
Within mind and principle, any modification, equivalent replacement, improvement and so on be should all be included in the protection scope of the present invention.
Claims (10)
1. a kind of system for monitoring wind-driven generator bolt fastening stress on-line, which is characterized in that including being mounted on wind-power electricity generation
The monitoring probe of end of the whole circle attachment bolt of the root of blade of machine, magnetic root of blade round linking bolt temperature sensing
Device, the data acquisition process equipment connecting with monitoring probe and temperature sensor and the monitoring each bolt of wind-driven generator are pre-
The monitoring system of clamp force；
Wherein the data acquisition process equipment includes data processing system, for blower information, bolt information, monitoring probe
Data processing and analysis are carried out with the data of temperature sensor acquisition；
The monitoring system is used to calculate upload data, calculates bolt pretightening and temperature-compensating, judges that pretightning force is
It is no in normal range (NR), to issue corresponding warning information.
2. the system of on-line monitoring wind-driven generator bolt fastening stress according to claim 1, which is characterized in that described
Monitoring probe includes the whole circle attachment bolt of root of blade, winding device, coupling layer, ultrasonic sensor and sensor terminals；
The winding device successively includes mounting hole, nested hole and bolt hole from top to bottom；
The protrusion outer rim of the ultrasonic sensor probe bottom is nested in winding device nesting hole；
The ultrasonic sensor ontology is installed through in mounting hole；
The coupling layer is coated in ultrasonic sensor probe bottom, and contacts with the whole circle attachment bolt end face of root of blade；
The whole circle attachment bolt of root of blade is threadedly coupled with the bolt hole of winding device；
The sensor terminals setting is connect in ultrasonic sensor, and with data acquisition process equipment.
3. the system of on-line monitoring wind-driven generator bolt fastening stress according to claim 1, which is characterized in that described
Blower information includes blower number, IP address, blower IP address, operation duration, interval, blade parameter or remark information；
The bolt information include bolt specification, bolt position number, monitoring probe installation number, calibration information, bolt clamping partial-length,
The specified preload force information of bolt or bolt allow pretightning force deviation range.
4. the system of on-line monitoring wind-driven generator bolt fastening stress according to claim 3, which is characterized in that described
Blade parameter includes blade number, leaf harvest port number, threshold voltage, yield value, acquisition average value number or acquisition time
Interval.
5. the system of on-line monitoring wind-driven generator bolt fastening stress according to claim 1, which is characterized in that several
A monitoring probe forms monitoring probe array.
6. the system of on-line monitoring wind-driven generator bolt fastening stress according to claim 1, which is characterized in that described
Upload information or temperature information when data include blower number, blade number, bolt position number, sound.
7. a kind of method for monitoring wind-driven generator bolt fastening stress on-line, which comprises the steps of:
1) blower information, bolt information are added to on-line monitoring system；
2) blower information, bolt information, starting on-line monitoring, the upload data that monitored data acquiring and processing device provides are read；
3) the upload data about blower and bolt monitored are parsed, calculates bolt pretightening and temperature-compensating, sentences
Whether disconnected pretightning force in normal range (NR) and makes early warning, saves data；If continuing to monitor without data are uploaded.
8. the method for on-line monitoring wind-driven generator bolt fastening stress according to claim 7, which is characterized in that described
Normal range (NR) refers to that the fastening stress and blade gravity of bolt and blower in static state are superimposed the state analysis model obtained；Or spiral shell
The fastening stress and the superposition of blade gravity of bolt and blower in static state, what stress value synthesis when being aided with practical normal operation obtained
State analysis model.
9. the method for on-line monitoring wind-driven generator bolt fastening stress according to claim 7, which is characterized in that step
3) in, it is as follows carries out resolving: intercepting the period to be analyzed, judge whether there is tools for bolts ' pretension force information record: if nothing, replacement
Period to be analyzed；If so, import the corresponding bolt pretightening record of the period blower to be analyzed, in conjunction with blower type or
Bolt information, reading state analysis model；Blowing machine is analyzed according to bolt pretightening record, state analysis model and monitoring data
The stress of monitoring site entirety bolt prejudges and tendency, and provides Intervention Advice, judges.
10. the method for on-line monitoring wind-driven generator bolt fastening stress according to claim 7, which is characterized in that step
It is rapid 3) in, whether judge pretightning force in normal range (NR): not in normal range (NR), early warning alarms, writes abnormal log, saves abnormal day
Will intervenes report, into preservation interface；In normal range (NR), force information will be pre-tightened and shown in corresponding fan monitoring unit interface, protected
Acquisition data are deposited, the period to be analyzed is replaced.
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| CN201811474252.2A CN109406036A (en) | 2018-12-04 | 2018-12-04 | Monitor the system and method for wind-driven generator bolt fastening stress on-line |
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| CN201811474252.2A CN109406036A (en) | 2018-12-04 | 2018-12-04 | Monitor the system and method for wind-driven generator bolt fastening stress on-line |
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