CN207779648U - A kind of pipe screw thread loosening monitoring device based on Piezoelectric Impedance method - Google Patents
A kind of pipe screw thread loosening monitoring device based on Piezoelectric Impedance method Download PDFInfo
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- CN207779648U CN207779648U CN201820186499.3U CN201820186499U CN207779648U CN 207779648 U CN207779648 U CN 207779648U CN 201820186499 U CN201820186499 U CN 201820186499U CN 207779648 U CN207779648 U CN 207779648U
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- screw thread
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Abstract
The utility model discloses a kind of, and the pipe screw thread based on Piezoelectric Impedance method loosens monitoring device, including piezoelectric ceramic piece, impedance analyzer and computer for analysis terminal, piezoelectric ceramic piece is fixed on the surface of nipple in a manner of surface mount, piezoelectric ceramic piece is connected by cable with impedance analyzer, impedance analyzer is connected with computer for analysis terminal, mechanical oscillation are generated using scanning voltage signal driving piezoelectric ceramic piece, and pipe screw joint is driven to generate vibratory response, vibratory response is captured and is acquired by piezoelectric ceramic piece again, the electrical impedance signal intensity received by comparative analysis judges that pipe screw thread connection loosens situation.The utility model can simply and easily realize the monitoring and identification of pipe thread seal state (loosening leakage), greatly improve the safety of pipe screw thread connection, reduce security risk and operation risk, improve overall economic benefit, generate positive meaning.
Description
Technical field
The utility model is related to structural health monitoring technology fields, are related to a kind of threaded connection loosening monitoring, and in particular to
A kind of pipe screw thread loosening monitoring device based on Piezoelectric Impedance method.
Background technology
Pipe screw thread is connected to connecting elements and is widely used in small-medium size pipe-line system, the pipe connected by pipe screw thread
Line has centering, guiding role good, the advantages of assembling, convenient disassembly, can bear larger axial force and torque.However, pipe
The pipeline of threaded connection is inevitably influenced by various external loads and effect of vibration during routine work, fatigue
Load effect is built up with the increase of pipe screw thread military service duration, if lacking rationally and effectively periodic inspection and safeguarding machine
System, pipe screw thread connection can usually occur to loosen and lead to leakage, cause the waste of public resource, can even cause when serious
Safety hazards have buried huge hidden danger to the people life property safety of the whole society.Therefore, how seal request has been solved
Pipeline in pipe screw joint loosening leakage problem it is of interest by people always for a long time, find a kind of simple and effective, warp
The pipe screw joint of Ji environmental protection, which loosens status real time monitor method, becomes the task of top priority.
Piezoelectric ceramics (Lead Zirconate Titanate, PZT) is with its distinctive sensing and actuator function and as close
One of the intellectual material studied and applied extensively in fields such as aerospace, the energy, machinery, building structure over year, because having
Response is fast, wide frequency range, easily cut, lower-price characteristic and that there is huge applications in terms of engineering structure monitoring is latent
Power.And wherein, the Piezoelectric Impedance Technology based on piezoceramic transducer, because using the forward and reverse piezoelectricity effect of piezoelectric material simultaneously
It answers, only in the stickup of tested body structure surface or an internal pre-buried piezoceramic transducer, you can realization is managed by geodesic structure minim
The monitoring and identification of characteristic changing.These characteristics, which make Piezoelectric Impedance Technology become monitoring structural health conditions field one kind, having wide hair
Exhibition and the monitoring of application prospect identify new technologies.
Utility model content
The technical problems to be solved in the utility model is that the blank in monitoring field is loosened for pipe screw joint, proposes one
Pipe screw thread of the kind based on Piezoelectric Impedance method loosens the monitoring device of disease, and it is accurate in real time to be carried out to the loosening of pipe screw joint
Ground monitors and identification.
In order to solve the above technical problems, technical solution used by the utility model is：
A kind of pipe screw thread loosening monitoring device based on Piezoelectric Impedance method, it is characterised in that：Including piezoelectric ceramic piece, impedance
Analyzer and computer for analysis terminal, piezoelectric ceramic piece are fixed on the surface of nipple, piezoelectric ceramics in a manner of surface mount
Piece is connected by cable with impedance analyzer, and the impedance analyzer is connected with computer for analysis terminal, and computer for analysis terminal is logical
It crosses cable control impedance analyzer and generates a frequency sweep voltage signal, the inverse piezoelectric effect through piezoelectric material generates mechanical oscillation, and
The pipe screw joint near piezoelectric ceramic piece is driven to generate vibratory response；The vibratory response of pipe screw joint is again by piezoelectric ceramic piece
It captures and acquires, and cause the variation of piezoelectric ceramic piece resistance antinoise signal, impedance analyzer is transferred back to through cable, then convert
For digital signal, computer for analysis terminal judges that pipe screw thread connection loosens situation by received signal variation.
As an improvement, uniformly smearing epoxy resin on piezoelectric ceramic piece surface, waterproof insulation process is carried out.
As an improvement, the output of sweep voltage and the acquisition reception device of resistance antinoise signal are impedance analyzer, impedance point
Analyzer is connected by fixture switching cable with piezoelectric ceramic piece, and impedance analyzer passes through LAN cables and computer for analysis terminal phase
Even.
The beneficial effects of the utility model are that the Piezoelectric Impedance skill of piezoceramic transducer (piezoelectric ceramic piece) will be based on
Art is applied to the monitoring and identification of the working condition (or loosening disease) of pipe screw joint, definite principle, of low cost, operation letter
Accurately, long-term on-line monitoring and the identification of pipe thread seal working condition may be implemented, for reducing pipe screw thread in single easy, identification
Joint looseness leaks the generation of disease, reduces monitoring and the operation expense of entire pipe-line system, science is judged and pre- test tube
The military service safety and remaining life of screw thread ensure the safe and efficient operating of entire pipe screw thread system engineering, safeguard numerous people
The security of the lives and property will generate positive meaning.
In addition the utility model is not necessarily to carry out specific customization to pipe screw joint to be monitored, only by single piezoelectric ceramics
Piece is fixed on by bonding method on existing pipe screw joint, convenient and efficient, and use cost is cheap.
Description of the drawings
Attached drawing 1 is the pipe screw thread connection and piezoelectric ceramic piece arrangement schematic diagram of the utility model.
Attached drawing 2 is that the pipe screw thread of the utility model loosens state monitoring apparatus schematic diagram.
Attached drawing 3 is the monitoring method building-block of logic of the utility model.
Attached drawing 4 is the Piezoelectric Impedance Technology schematic diagram based on piezoelectric ceramic piece.
Attached drawing 5 is that pipe screw thread is connected to thread contact area reduction contrast schematic diagram under sealing and loosening state；
Wherein Fig. 5 a are that pipe screw thread connects sealing state schematic diagram, and Fig. 5 b are that pipe screw thread connects schematic diagram under loosening state.
In figure：1- screwed pipes, 2- nipples, 3- piezoelectric ceramic pieces, 4- fixture Convertion cables, 5- impedance analyzers, 6-
LAN cables, 7- computer for analysis terminals.
Specific implementation mode
Specific description is done to the embodiment of the utility model with reference to the accompanying drawings and examples：
Two screwed pipes 1 carry out pipe screw thread connection by nipple 2, form pipe screw joint, take surface viscous later
One piezoelectric ceramic piece 3 is fixed on the surface of nipple 2 by the mode of patch, as shown in Figure 1, and on 3 surface of piezoelectric ceramic piece
Epoxy resin is uniformly smeared, waterproof insulation process is carried out；
3 positive and negative of piezoelectric ceramic piece is connected to by suitable fixture Convertion cable 4 on impedance analyzer 5 respectively, this
The impedance analyzer 5 that embodiment uses is high-precision impedance analyzer, and then, impedance analyzer 5 passes through LAN cables 6 and computer
Analysing terminal 7 is connected；
As shown in Figures 2 and 3, computer for analysis terminal 7 controls impedance analyzer 5 by LAN cables 6 and generates a sweep voltage
Signal, and be output on piezoelectric ceramic piece 3 by fixture Convertion cable 4, utilize the inverse piezoelectric effect of piezoelectric material, sweep voltage
Signal drives piezoelectric ceramic piece 3 to generate mechanical oscillation, is rung to drive the pipe screw joint on 3 periphery of piezoelectric ceramic piece to generate vibration
It answers；At the same time, vibration response signal is captured and is acquired by piezoelectric ceramic piece 3, utilizes the direct piezoelectric effect of piezoelectric material, pressure
Electroceramics piece 3 converts the vibration response signal of capture to resistance antinoise signal, and impedance analyzer is transferred back to through fixture Convertion cable 4
5, impedance analyzer 5 converts the resistance antinoise signal of reception to digital signal, is transmitted back to computer for analysis by LAN cables 6 later
Terminal 7；
Under the normal seal operation state of the pipe screw thread defined in computer analysis system, the electricity of measured piezoelectric ceramic piece 3
Impedance signal builds identification feature parameter reference value as reference signal, is surveyed later by monitoring the connection of different times pipe screw thread
The identification feature parameter for measuring the resistance antinoise signal of acquisition, simultaneously with the comparative analysis of identification feature parameter reference value by identification feature parameter
It calculates and loosens judging quota, the variation by monitoring judging quota obtains the sealing situation of pipe screw joint.Defined loosening
Judging quota is bigger, then shows that the more normal sealing state deviation of working condition that measured tube is threadedly coupled is bigger.
For example, after collecting the resistance antinoise signal Z of piezoelectric ceramic piece 3 by the utility model, electrical impedance can be calculated
The electric admittance signal Y of derivative value (inverse of electrical impedance)-of signal Z, it is assumed that by the real part G (conductance) of electric admittance signal Y as knowledge
Other characteristic parameter, then the loosening judging quota of pipe screw thread at this time, you can use the square root deviation (Root-mean- of conductance G
Square-deviation, RMSD) it indicates, i.e.,
Wherein, G (ωi) indicate piezoelectric ceramic piece in scanning voltage Frequency point ωiThe admittance solid part signal value of lower measurement, G0
(ωi) it is scan frequency point ω under the normal sealing state of pipe screw threadiUnder benchmark admittance solid part signal value, N indicate scanning voltage frequency
Rate range [ω0ω1] in total measuring point number.Wherein, the conductance in above formula receive solid part signal G can also by resistance antinoise signal resistance,
Conductance, susceptance and crest frequency of reactance, crest frequency or electric admittance signal etc. replace.
Here the basic principle of the utility model is provided, it is necessary first to understand based on piezoelectric ceramic piece (piezoelectric ceramics sensing
Device) Piezoelectric Impedance method basic principle, for the sake of convenient, the electromechanical coupling characteristics of piezoelectric ceramic piece and tested agent structure can be with
It is indicated and is analyzed with one-dimensional SMD (quality spring damping) models shown in Fig. 4.First, high-frequency ac voltage pair is inputted
Piezoelectric ceramic piece (PZT) carries out high frequency pumping, and due to the inverse piezoelectric effect of piezoelectric material, driving voltage drives piezoelectric ceramic piece production
The mechanical oscillation in the directions raw x, to drive agent structure to vibrate, agent structure intercouples with piezoelectric ceramic piece at this time,
Object properties parameter (mass M, stiffness K and damping C) variation of agent structure directly influences piezoelectric ceramic piece coupled thereto
Vibratory response, under the action of piezoelectric material direct piezoelectric effect, the vibratory response of piezoelectric ceramic piece exports again to be believed for electrical impedance
Number, therefore can reflect that the vibration of agent structure is special indirectly by monitoring the variation of the resistance antinoise signal of piezoelectric ceramic piece
Property, the i.e. health status of structure.
It is directed to pipe screw thread connection, two screwed pipes 1 carry out pipe screw thread connection by nipple 2, as shown in figure 5, working as
When pipe screw thread loosens, it is assumed that 2 holding position of nipple is fixed, and screwed pipe 1 is along loosening direction (it is assumed that counterclockwise
Direction) twist (such as Fig. 1), and screwed pipe 1 and the thread contact area of nipple 2 reduce therewith at this time.For pipe screw thread,
Assuming that screwed pipe 1 counterclockwise often rotates one week, reduce Δ S with the contact area of nipple 20, this value is in pipe screw thread
It is determined when manufacture, it is only related (diameter of thread, angle of thread, helical pitch etc.) with the geometric parameter of pipe screw thread.
It is assumed that when pipe screw thread loosens, the torsion of θ counterclockwise occurs for screwed pipe 1, and under such loosening state, pipe screw thread connects
Contacting surface product knots modification △ S can be expressed as：
Formula (2) can be expressed as：
△ S ∝ θ formula (3)
I.e. when pipe screw thread loosens, thread contact area change amount and the screwed pipe 1 of screwed pipe 1 and nipple 2
It is directly proportional along the corner for loosening direction twisting.
Therefore, when pipe screw thread loosens, the thread contact area of screwed pipe 1 and nipple 2 reduces therewith, thus
Bring the variation of the physical attributes such as structure partial rigidity and the damping of pipe screw joint.It makes pottery when with sweep voltage signal excitation piezoelectricity
When tile, the mechanical oscillation that piezoelectric ceramic piece generates drive pipe screw thread to vibrate, at this point, the change of agent structure physical attribute
The vibratory response of the piezoelectric ceramic piece coupled with pipe screw thread is directly influenced, then, including structure physics attribute change information
Vibration response signal is captured by piezoelectric ceramic piece and is converted into resistance antinoise signal, later, by collected resistance antinoise signal and pipe
Collected Piezoelectric Impedance reference signal compares and analyzes under the normal sealing state of screw thread.When unchanged, then show pipe spiral shell
Line good seal, non-loosening leakage occur, and otherwise show that loosening occurs in pipe screw thread, seal shape is connected to pipe screw thread to realize
The monitoring and examination of state.The utility model proposes Method And Principle is simple, operation is easy, loosenings small to pipe screw thread, which changes, also can
Accomplish accurate monitoring in real time and identification.
When the utility model is connected to loosening generation using pipe screw thread, the thread contact face between screwed pipe and nipple
Product changes, and the pipe screw thread physical attribute thus brought changes directly feedback in the electricity of the piezoelectric ceramic piece coupled with pipe screw thread
Basic principle in impedance signal variation, it is close by comparing the piezoelectric ceramic piece resistance antinoise signal and pipe screw thread of analyzing actual acquisition
The relative size of reference value under envelope state, you can the monitoring and identification for simply and efficiently realizing pipe thread seal state, for carrying
The safety that senior executive is threadedly coupled reduces security risk and operation risk, improves overall economic benefit, will generate positive meaning
Justice.
Claims (3)
1. a kind of pipe screw thread based on Piezoelectric Impedance method loosens monitoring device, it is characterised in that：Including piezoelectric ceramic piece, impedance point
Analyzer and computer for analysis terminal, piezoelectric ceramic piece are fixed on the surface of nipple, piezoelectric ceramic piece in a manner of surface mount
It is connected with impedance analyzer by cable, the impedance analyzer is connected with computer for analysis terminal, and computer for analysis terminal passes through
Cable controls impedance analyzer and generates a frequency sweep voltage signal, and the inverse piezoelectric effect through piezoelectric material generates mechanical oscillation, and band
Pipe screw joint near dynamic piezoelectric ceramic piece generates vibratory response；The vibratory response of pipe screw joint is again by piezoelectric ceramic piece institute
It captures and acquires, and cause the variation of piezoelectric ceramic piece resistance antinoise signal, transfer back to impedance analyzer through cable, be subsequently converted to
Digital signal, computer for analysis terminal judge that pipe screw thread connection loosens situation by received signal variation.
2. pipe screw thread as described in claim 1 loosens monitoring device, it is characterised in that：It is uniformly smeared on piezoelectric ceramic piece surface
Epoxy resin carries out waterproof insulation process.
3. pipe screw thread as described in claim 1 loosens monitoring device, it is characterised in that：The output of sweep voltage and electrical impedance letter
Number acquisition reception device be impedance analyzer, impedance analyzer by fixture transfer cable be connected with piezoelectric ceramic piece, resistance
Analysis resistant instrument is connected by LAN cables with computer for analysis terminal.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820186499.3U CN207779648U (en) | 2018-02-02 | 2018-02-02 | A kind of pipe screw thread loosening monitoring device based on Piezoelectric Impedance method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820186499.3U CN207779648U (en) | 2018-02-02 | 2018-02-02 | A kind of pipe screw thread loosening monitoring device based on Piezoelectric Impedance method |
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| CN207779648U true CN207779648U (en) | 2018-08-28 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113267536A (en) * | 2021-05-14 | 2021-08-17 | 大连理工大学 | Multi-frequency band impedance fusion loose bolt positioning method |
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2018
- 2018-02-02 CN CN201820186499.3U patent/CN207779648U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113267536A (en) * | 2021-05-14 | 2021-08-17 | 大连理工大学 | Multi-frequency band impedance fusion loose bolt positioning method |
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