CN106018543B - A kind of bolt connection part damage in-situ monitor device based on Metal magnetic memory - Google Patents
A kind of bolt connection part damage in-situ monitor device based on Metal magnetic memory Download PDFInfo
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- CN106018543B CN106018543B CN201610322261.4A CN201610322261A CN106018543B CN 106018543 B CN106018543 B CN 106018543B CN 201610322261 A CN201610322261 A CN 201610322261A CN 106018543 B CN106018543 B CN 106018543B
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- magnetic memory
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
- G01N27/72—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating magnetic variables
- G01N27/82—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating magnetic variables for investigating the presence of flaws
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/32—Investigating strength properties of solid materials by application of mechanical stress by applying repeated or pulsating forces
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0001—Type of application of the stress
- G01N2203/0005—Repeated or cyclic
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- Health & Medical Sciences (AREA)
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- General Physics & Mathematics (AREA)
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- Electrochemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Investigating Or Analyzing Materials By The Use Of Magnetic Means (AREA)
Abstract
The present invention relates to a kind of, and the bolt connection part based on Metal magnetic memory damages in-situ monitor device, belongs to magnetic memory detection technology scope in field of non destructive testing.Monitoring device is made of bolt, double nut, holddown spring, probe protective shell, sensor array and connector.Sensor array is located in probe protective shell, and by popping one's head in, protective shell is protected；Holddown spring and probe protective shell connect, for compressing sensor array probe；Double nut controls sensor array at a distance from connector for the spring that is fixed and clamped；Screw bolt passes double nut, holddown spring, probe protective shell, sensor array and connector.The device can in real time, on-line monitoring be bolted the appearance of position fatigue damage, and can the Damage and Fracture position to connector predict.
Description
Technical field
The present invention relates to a kind of, and the bolt connection part based on Metal magnetic memory damages in-situ monitor device, belongs to non-destructive testing
Magnetic memory detection technology scope in field.
Background technique
Magnetic memory testing is a kind of magnetic NDT method method for being still in the growth stage, it is in incipient fatigue damage assessment side
Face great potential.The technology is based on magneto-mechanical effect principle, by Surface field distribution and its variation of intensity, can not only examine
The plastic deformation and gross imperfection of ferromagnetic material are measured, the early stage stress that more can effectively detect ferromagnetic material is concentrated.In engineering
In, magnetizing assembly is not needed to measured workpiece progress artificial magnetization since the technology has, and do not have to measured surface
The advantages that carrying out specially treated and polishing, has been widely used in the fields such as petroleum, chemical industry, electric power, railway, bridge.
Bolt connection structure is applied very extensive in practical projects, and coupled situation is directly related to whole equipment or knot
The safety and reliability of structure work.Since bolt hole often will appear fatigue crack vulnerable to alternate load effect, and then occur disconnected
The catastrophic failures such as split.Although magnetic powder inspection can preferably detect crackle, when this method is not unpredictable cracked
Earlier damage, and the workpiece in strap bolt hole can only be decomposed in machinery overhaul and carry out static detection.Monitoring refers to survey
Amount system grasps the shape of structural member without departing from measured structure, on-line monitoring real-time to in-service rapid wear mechanical structured member in time
State, to ensure the safety and reliability of mechanical equipment work.
Summary of the invention
The object of the present invention is to provide a kind of in-situ monitor device of bolt connection part damage, which can effectively be solved
The problem of in-service bolt connection part damage monitoring, can carry out real-time, on-line monitoring to faulted condition near connector bolt hole,
Important evidence is provided for the safe and reliable operation of structural member.
The purpose of the present invention is what is be achieved through the following technical solutions.
A kind of bolt connection part damage in-situ monitor device based on Metal magnetic memory, by bolt, double nut, compresses bullet
Spring, probe protective shell, sensor array and connector form.Sensor array is located in probe protective shell, is protected by probe
Shell is protected；Holddown spring and probe protective shell connect, for compressing magnetic sensing probe；Double nut is for fixed pressure
Tight spring, and then sensor array is controlled at a distance from connector；Screw bolt passes double nut, holddown spring, probe protection
Shell, sensor array and connector.
The sensor array is made of multiple giant magnetoresistance chips and hardware circuit, and giant magnetoresistance chip is formed around bolt hole
Annular distance array structure；Hardware circuit carries out second level enhanced processing to signal using AD620 and UA741, and designs the passive filter of low pass
Wave device is filtered.
The quantity of the giant magnetoresistance chip is at least 8.
The course of work: connector being loaded on Fatigue elongation machine, and sensor array is installed at bolt hole, is connected
Measuring device simultaneously is completed to debug；Start in-situ monitor device and Fatigue elongation machine, after being stretched to predetermined cycle-index, closes and stretch
Machine simultaneously unloads, and connector is made to be in the state that do not stress；Each multi-channel output signal that sensor array measurement is obtained is stored in meter
In calculation machine, and do corresponding signal processing；It is again started up Fatigue elongation machine, until test specimen is broken；According to circulation early period to difference
The variation of magnetic memory signal gradient absolute value when cycle-index, the position that can effectively judge connector damage and will be broken.
Beneficial effect
1. a kind of bolt connection part based on Metal magnetic memory of the invention damages in-situ monitor device, may be implemented important
The in-situ monitor of component surface damage provides a kind of new Method and kit for for such technical research.
2. what the technology utilized is that earth's magnetic field and service load effect are lower the invention belongs to Magnetic Memory non-destructive testing technology
Natural magnetization information, does not need special magnetizing equipment and carries out artificial magnetization to measured workpiece, monitoring device is made to obtain significant letter
Change.
3. the present invention can not only carry out in-situ monitor to bolt connection part, technical idea is a variety of to welding, riveting etc.
Situation is all applicable in, and can be monitored on-line by appropriate adjustment monitoring device structure to other connecting modes.
Detailed description of the invention
Fig. 1 is in-situ monitor schematic device；
Fig. 2 is signal processing circuit schematic diagram；
Fig. 3 is sensing element location map；
Fig. 4 is connector pictorial diagram；
Fig. 5 is loading method；
Fig. 6 is magnetic memory signal distribution map；
Fig. 7 is magnetic memory signal gradient absolute value distribution map；
Fig. 8 is fracture specimen.
In figure, 1- bolt, 2- double nut, 3- holddown spring, 4- probe protective shell, 5- sensor array, 6- connector.
Specific embodiment
The invention will be further described with embodiment with reference to the accompanying drawing.
Embodiment 1
A kind of bolt connection part damage in-situ monitor device based on Metal magnetic memory, as shown in Figure 1, by bolt 1, double spiral shells
Mother 2, holddown spring 3, probe protective shell 4, sensor array 5 and connector 6 form.Sensor array 5 is located at probe protective shell 4
In, by popping one's head in, protective shell 4 is protected；Holddown spring 3 and probe protective shell 4 connect, and visit for compressing Magnetic Sensor
Head；Double nut 2 controls sensor array 5 at a distance from connector 6 for the spring 3 that is fixed and clamped；Bolt 1 sequentially passes through
Double nut 2, holddown spring 3, probe protective shell 4, sensor array 5 and connector 6.
Hardware circuit using AD620 and UA741 to signal carry out second level enhanced processing, and design low pass passive filter into
Row filtering, as shown in Figure 2.Primary amplification is carried out to signal using AD620 first, amplification factor is 1000 times or so；Using two
Rank low pass passive filter is filtered garbage signal, filter cutoff frequency 5Hz；Using typical chip UA741 to filter
Signal after wave carries out second level enhanced processing, and amplification factor is 10 times or so.
The sensor array 5 is made of multiple giant magnetoresistance chips and hardware circuit, and giant magnetoresistance chip surrounds bolt hole group
Cyclic hole array structure, as shown in Figure 3.
The quantity of the giant magnetoresistance chip is at least 8.
Bolt connection structure is mainly made of bolt and connector.Wherein bolt is prepared after being quenched processing by 45# steel, and
Connector is made of the Q235 steel board containing central core member, having a size of long 220mm × wide 50mm × thickness 3mm, as shown in Figure 4.
The course of work: connector 6 being loaded on Fatigue elongation machine, and sensor array 5 is installed at bolt hole, even
It connects measuring device and completes to debug；Start in-situ monitor device and Fatigue elongation machine, carries out tired drawing according to sinusoidal load mode
It stretches, i.e., is loaded and unloaded according to constant duration on sine curve, as shown in figure 5, extremely unloaded after predetermined cycle-index,
Connector is set to be in the state that do not stress；Each multi-channel output signal that sensor array measurement is obtained is stored in computer, and
Do corresponding signal processing；It is again started up Fatigue elongation machine, until test specimen is broken；Magnetic memory signal when calculating different cycle-indexes
The variation of gradient absolute value.
Magnetic memory signal as shown in fig. 6, seek gradient to magnetic memory signal, obtains Magnetic Memory with fatigue life cycle distribution map
Signal gradient absolute value distribution map, as shown in Figure 7.
When the damage of crackle class occurs, according to magnetic memory detecting method discrimination standard, there should be biggish gradient signal, for this
Signal sets empirical value, that is, can determine that and occurred in bolt connection part or the position damaged will have occurred, to realize spiral shell
The in-situ monitor of bolt connector damage.
By Fig. 7, it can be seen that, changing most violent place is the position of giant magnetoresistance chip 4 and 8, magnetic signal degree of fluctuation
Maximum, this is in the detection research of magnetic memory signal before this, and before metal material is on the verge of destruction, signal can generate the conclusion of acute variation
Unanimously.Subsequent observation proves that fatigue crack occurs over these locations, as shown in Figure 8.This illustrate the device can in real time,
On-line monitoring is bolted the appearance of position fatigue damage, and can the Damage and Fracture position to connector predict.
Claims (5)
1. a kind of bolt connection part based on Metal magnetic memory damages in-situ monitor method, it is characterised in that: bolt connection part damage
Hurt in-situ monitor device by bolt (1), double nut (2), holddown spring (3), probe protective shell (4), sensor array (5) and connection
Fitting (6) composition；Sensor array (5) is located in probe protective shell (4), and by popping one's head in, protective shell (4) are protected；Compress bullet
Spring (3) and probe protective shell (4) connect, for compressing sensor array probe；Double nut (2) is for the spring that is fixed and clamped
(3), and then sensor array (5) are controlled at a distance from connector (6)；Bolt (1) sequentially passes through double nut (2), holddown spring
(3), probe protective shell (4), sensor array (5) and connector (6)；Wherein, the sensor array (5) is by multiple giant magnetoresistances
Chip and hardware circuit composition, giant magnetoresistance chip form annular distance array structure around bolt hole；
The course of work of bolt connection part damage in-situ monitor device are as follows: connector (6) is loaded on Fatigue elongation machine,
And sensor array (5) is installed at bolt hole, measuring device is connected and completes to debug；Start in-situ monitor device and fatigue
Stretching-machine after being stretched to predetermined cycle-index, is closed stretching-machine and is unloaded, connector is made to be in the state that do not stress；Array is passed
Each multi-channel output signal that sensor measurement obtains is stored in computer, and does corresponding signal processing；It is again started up tired drawing
Machine is stretched, until test specimen is broken；According to the variation of magnetic memory signal gradient absolute value when recycling early period to different cycle-indexes, specifically
Are as follows:
It obtains magnetic memory signal to be distributed with fatigue life cycle, gradient is asked to magnetic memory signal, it is exhausted to obtain magnetic memory signal gradient
To Distribution value；
When the damage of crackle class occurs, according to magnetic memory detecting method discrimination standard, gradient signal setting empirical value should be, i.e.,
It can determine that and occurred in bolt connection part or the position damaged will have occurred, to realize the prison in place of bolt connection part damage
It surveys.
2. a kind of bolt connection part based on Metal magnetic memory as described in claim 1 damages in-situ monitor method, feature
Be: the hardware circuit carries out second level enhanced processing to signal using AD620 and UA741, and designs low pass passive filtering
Device is filtered.
3. a kind of bolt connection part based on Metal magnetic memory as claimed in claim 2 damages in-situ monitor method, feature
Be: the AD620 carries out primary amplification to signal, and amplification factor is 1000 times；The low pass passive filter is second order
Low pass passive filter is filtered garbage signal, filter cutoff frequency 5Hz；Using UA741 to filtered signal
Second level enhanced processing is carried out, amplification factor is 10 times.
4. a kind of bolt connection part based on Metal magnetic memory as described in claim 1 damages in-situ monitor method, feature
Be: the quantity of the giant magnetoresistance chip is at least 8.
5. a kind of bolt connection part based on Metal magnetic memory as described in claim 1 damages in-situ monitor method, feature
Be: bolt (1) is prepared after being quenched processing by 45# steel, and connector (6) is made of the Q235 steel board containing central core member,
It is having a size of long 220mm × wide 50mm × thickness 3mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610322261.4A CN106018543B (en) | 2016-05-16 | 2016-05-16 | A kind of bolt connection part damage in-situ monitor device based on Metal magnetic memory |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610322261.4A CN106018543B (en) | 2016-05-16 | 2016-05-16 | A kind of bolt connection part damage in-situ monitor device based on Metal magnetic memory |
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| Publication Number | Publication Date |
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| CN106018543A CN106018543A (en) | 2016-10-12 |
| CN106018543B true CN106018543B (en) | 2019-11-05 |
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| CN109975420B (en) * | 2017-12-27 | 2023-05-12 | 核动力运行研究所 | Water logging focusing ultrasonic probe parameter precision measurement device |
| CN108195930B (en) * | 2018-01-08 | 2021-12-21 | 沈阳工业大学 | Magnetic memory mobile scanning type acousto-optic alarm system |
| CN108181376B (en) * | 2018-01-08 | 2021-12-21 | 沈阳工业大学 | Magnetic memory fixed point acousto-optic alarm system |
| CN108152364A (en) * | 2018-01-08 | 2018-06-12 | 沈阳工业大学 | A kind of novel Magnetic Memory fixed point sound-light alarm control method |
| CN108195929A (en) * | 2018-01-08 | 2018-06-22 | 沈阳工业大学 | A kind of novel Magnetic Memory motion scan formula sound-light alarm control method |
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| JP3955247B2 (en) * | 2002-08-30 | 2007-08-08 | 嘉昭 佐藤 | Concrete shrinkage cracking test equipment |
| CN102507727A (en) * | 2011-10-19 | 2012-06-20 | 合肥工业大学 | Detecting and testing platform for metal magnetic memory based on giant magnetic effect and application thereof |
| CN102539518A (en) * | 2011-10-31 | 2012-07-04 | 北京理工大学 | Magnetism in-situ detection method for metal cracking expansion under condition of variable magnetic excitation |
| CN102590326A (en) * | 2011-10-31 | 2012-07-18 | 北京理工大学 | Magnetic memory/magnetic leakage integrated multi-probe detection device for tube and shaft type parts |
| CN104154095A (en) * | 2014-06-04 | 2014-11-19 | 苏州博讯仪器有限公司 | Anti-collision part bolt for drawing mine car |
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