CN104280453B - PCCP steel wire fracture of wire detecting systems - Google Patents
PCCP steel wire fracture of wire detecting systems Download PDFInfo
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- CN104280453B CN104280453B CN201410532086.2A CN201410532086A CN104280453B CN 104280453 B CN104280453 B CN 104280453B CN 201410532086 A CN201410532086 A CN 201410532086A CN 104280453 B CN104280453 B CN 104280453B
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Abstract
The invention provides a kind of PCCP steel wires fracture of wire detecting system, including main control computer, detection main frame, receiving transducer, transmitting probe, car body and measuring wheel, the main control computer, detection main frame, receiving transducer, transmitting probe and measuring wheel are together advanced on the car body and with the car body, and the receiving transducer, transmitting probe and measuring wheel, main control computer are connected with the detection main frame；The transmitting probe includes transmitting coil and blanking disc, and in the blanking disc, the blanking disc is at least used for the direct-coupling signal decayed between the transmitting coil and receiving transducer to the transmitting coil；The measuring wheel, to generate the pulse signal according to the change in location advanced.The detection main frame, at least to the pulse signal triggering exported by the measuring wheel, gathers the voltage signal that the synchronous reference signal and Jing are processed.
Description
Technical field
The present invention relates to concrete field, more particularly to a kind of PCCP steel wires fracture of wire detecting system.
Background technology
PCCP pipes (Prestressed Concrete Cylinder Pipe) is the prestressed concrete pipe with steel cylinder
Referred to as, it is to use at present extensive heavy caliber, high pressure resistant tubing in the world, by being embedded into the tube core of thin steel cylinder, be entangled in outside tube core
Cement mortar protective course composition outside compressor wire (diameter) and steel wire, as shown in Figure 1.The two ends of pipe are welded with steel respectively
Socket ring and socket circle, the flexible joint of pipe adopts slip rubber sealing.Under in working order, be embedded in the pipe wall is thin
Steel cylinder has impervious function, the compressor wire being wrapped in outside tube core and the concrete wall of tube core bear the internal water pressure of tubing and
External load, therefore PCCP pipes are a kind of pipe kinds that steel pipe is combined with the advantage of common prestressed concrete pipe.
The characteristics of transformer coupled (RFECTC) technology of far-field eddy detects metal pipe material, this technology using interior probe mode
It is to check ferrous material, nonferrous materials can be checked again, and to internal or outside abnormal conditions tool
There is identical sensitivity.The entirety that pit, crackle and tube wall can just be detected using single probe is thinning.
An excitation coil is adopted to induce circumferential vortex with low level of magnetization in tube wall, with more conventional vortex
Detection is different, and detection coil is placed at 2～3 times of calibers of excitation coil by the technology along pipeline, and detector signal is relative
The tolerance of tube wall characteristic is often used as in the phase place of excitation coil.
The excitation coil driven by the at a fairly low sinusoidal signal of frequency, the built-in field for producing in the duct can be
The both sides of excitation coil are divided into three different regions of property, and these regions are referred to as direct-coupling area, transition region and far-field region,
As shown in figure 1, the transformer coupled know-why schematic diagram of far-field eddy.
Although how many affected by pipeline presence, the coupling that direct-coupling area is mainly directly aligned from excitation coil
Close, play a simple transformator.The intensity of directly excitation is very big in the vicinity of excitation coil, but with away from excitation
The distance of coil increases and decays rapidly, and most eddy-current instrument works in this directly excitation area or near field region.However, setting
Under conditions of standby size is limited, the distance of excitation coil and receiving coil can not meet the required distance of 2-3 times of caliber, just cannot
Realize effective fracture of wire detection.
The content of the invention
The technical problem to be solved in the present invention realizes the fracture of wire detection of PCCP pipes under conditions of equipment size is limited.
In order to solve this technical problem, the invention provides a kind of PCCP steel wires fracture of wire detecting system, including master control meter
Calculation machine, detection main frame, receiving transducer, transmitting probe, car body and measuring wheel, the main control computer, detection main frame, reception are visited
Head, transmitting probe and measuring wheel are together advanced on the car body and with the car body, the receiving transducer, transmitting probe
It is connected with the detection main frame with measuring wheel, main control computer；
The transmitting probe includes transmitting coil and blanking disc, and the transmitting coil is located in the blanking disc, described
Ray circle, at least to respond the AC signal that the detection main frame is input into, launches corresponding electromagnetic wave signal, so as in PCCP
Eddy current signal is induced on tube wall；The blanking disc is at least used for the direct coupling decayed between the transmitting coil and receiving transducer
Close signal；The AC signal includes the test AC signal and reference synchronization AC signal for matching each other；
The receiving transducer, it is at least to respond the eddy current signal, corresponding with the AC signal so as to induce
Voltage signal, and transmit to the detection main frame；The voltage signal includes test corresponding with the test AC signal
Voltage signal and reference synchronization voltage signal corresponding with the reference synchronization AC signal；
The detection main frame, at least to：
The AC signal is generated, and is exported to the transmitting probe and main control computer；
The pulse signal exported by the measuring wheel is triggered, and gathers the reference synchronization voltage signal that Jing processes and described
Test voltage signal；
The master control will be uploaded to Jing after the reference synchronization voltage signal of process with the test voltage signal processing
Computer；
The main control computer, at least to：
The artificial input of response automatically controls the running for detecting main frame according to presupposed information；
The artificial input of response automatically processes from the detection main frame signal for receiving according to presupposed information；
So as to storing and showing testing result；
The measuring wheel, to generate the pulse signal according to the change in location advanced.
The blanking disc is double-layer shielding structure, including one layer of copper sheet layer and one layer of iron sheet layer.
The transmitting probe is installed on the car body by a length-adjustable probe support arm.
The support arm is fixed on the car body so that the receiving transducer and transmitting probe are along PCCP calibers to row
Cloth, and further such that the receiving transducer is located at the top on the inside of PCCP pipes, bottom of the transmitting probe on the inside of PCCP pipes.
The detection main frame at least includes transmitter, receiver and data collecting card, and the transmitter is visited with the transmitting
Head connection, the receiver are connected with the receiving transducer, and the data collecting card is calculated with the receiver and master control respectively
Machine connects, and the transmitter is also connected with the main control computer.
The transmitter includes signal source and power amplifier, and the signal source is to produce the AC signal；It is described
Power amplifier to carry out power amplification to the alternating-current measurement stream signal, and by the reference synchronization AC signal and amplification
Test AC signal afterwards is transmitted to the transmitting probe, is allowed to realize the transmitting of electromagnetic wave signal.
The signal source includes low-power scm, DDS chips, low pass filter and phase inverter, the low-power consumption monolithic
Machine, DDS chips, low pass filter and power amplifier are sequentially connected, so as to export the test by the power amplifier
AC signal；The low-power scm, DDS chips and phase inverter are sequentially connected, synchronous so as to pass through the phase inverter output
With reference to AC signal.
The power amplifier includes pre-amplification circuit, power amplification circuit and regulated power supply, the AC signal according to
It is secondary to realize amplifying through the pre-amplification circuit and power amplification circuit, export so as to pass through the power amplification circuit, institute
State regulated power supply to be connected with the pre-amplification circuit and power amplification circuit respectively.
The receiver includes lock-in amplifier, and the receiving transducer includes receiving coil and low-noise amplifier, Jing institutes
State test voltage signal that receiving coil senses and reference synchronization voltage signal low-noise amplifier described in Jing and lock phase successively
The data collecting card is input to after amplifier process.
The detection main frame also includes energy supply control module, and the power module includes charger, accumulator, detection resistance
With battery monitor chip, the battery monitor chip is connected with the accumulator and detection resistance respectively, the charger
It is connected with the accumulator with detection resistance, the battery monitor chip is also connected with the main control computer by single-chip microcomputer
Connect.
The present invention considers the energy that transmitting probe and receiving transducer direct-coupling come under conditions of equipment size is limited
Energy of the amount much larger than far-field eddy signal.By the setting of blanking disc, can decay or block transmitting probe and receiving transducer
Between, i.e., the direct-coupling path between excitation coil and receiving coil, prominent far-field eddy information are much smaller than far field distance
2-3 times of caliber.Additionally, present invention further introduces measuring wheel, change in location of the collection of data with system is connected, so as to
So that Detection results are more preferably.
Description of the drawings
Fig. 1 is the transformer coupled know-why schematic diagram of far-field eddy in prior art
Fig. 2 is the connection diagram of PCCP steel wire fracture of wire detecting systems in one embodiment of the invention；
Fig. 3 is the structural representation of PCCP steel wire fracture of wire detecting systems in one embodiment of the invention；
Fig. 4 is the structural representation of detection main frame in one embodiment of the invention；
Fig. 5 is signal source and theory diagram in one embodiment of the invention；
Fig. 6 is the theory diagram of one embodiment of the invention intermediate power amplifier；
Fig. 7 is the theory diagram of lock-in amplifier in one embodiment of the invention；
Fig. 8 is the theory diagram of Power Monitoring Unit in one embodiment of the invention.
Specific embodiment
The PCCP steel wire fracture of wire detecting systems that the present invention is provided are described in detail below with reference to Fig. 1 to Fig. 8, its
For an optional embodiment of the invention, it is believed that those skilled in the art is not changing the model of spirit of the invention and content
Which can be modified and polish in enclosing.
A kind of PCCP steel wires fracture of wire detecting system is present embodiments provided, Fig. 2 and Fig. 3 is refer to, including main control computer,
Detection main frame, receiving transducer, transmitting probe, car body and measuring wheel, the main control computer, detection main frame, receiving transducer, transmitting
Probe and measuring wheel are together advanced on the car body and with the car body, the receiving transducer, transmitting probe and range finding
Wheel, main control computer are connected with the detection main frame.
The present invention is the improvement carried out to detecting system, mainly stresses process and the equipment for detecting, obtains as detection
How final curves, signal compare process, belong to this area conventional meanses, so be not specifically described.
With regard to the transmitting probe：
The transmitting probe includes transmitting coil and blanking disc, and the transmitting coil is located in the blanking disc, described
Ray circle, at least to respond the AC signal that the detection main frame is input into, launches corresponding electromagnetic wave signal, so as in PCCP
Eddy current signal is induced on tube wall；The blanking disc is at least used for the direct coupling decayed between the transmitting coil and receiving transducer
Close signal；The AC signal includes the test AC signal and reference synchronization AC signal for matching each other；According to blanking disc
Effect, it may be to know that its specific shape and its spatial relationship between transmitting coil, be with can realize decay direct-coupling
Signal is defined.
Transmitting coil is a kind of transducer, and the AC signal that low-frequency power amplifier is exported is converted into electromagnetic wave signal and is launched
Go, eddy current signal is induced on PCCP tube walls.
Transmitting coil requires there are higher quality factor with high energy conversion efficiency and low energy loss, i.e. requirement
(Q) wire of coiling, is generally selected according to operating frequency.The inductance coil of low-frequency range work should be using the band such as enamel-covered wire absolutely
The wire coiling of edge.For inductance coil of the operating frequency between tens kilo hertzs to two megahertzs, split conductor should be adopted
Coiling, to increase conductor net sectional area, reduces the impact of kelvin effect, and Q-value can be made to improve 30%-40%.For work frequency
Inductance coil of the rate higher than 2MHz, should adopt sub-thread heavy gauge wire coiling, and the diameter of wire is typically between 0.3-1.5mm.This is
The operating frequency of system is relatively low, thus from enamel-covered wire as coiling wire.
The form of transmitting coil adopts single loop coil form, and the advantage of single loop coil is the distribution rule of its induction field
Then, good directionality, its inductive mode are shaped like a Semen Maydiss, while which makes and processes also fairly simple.Single-circuit line
Another big feature of circle is to be easy to parameter calculating, is conducive to carrying out analytical type design, and its impedance is represented by：
Z=R+j ω L (1)
Real part is D.C. resistance, can be calculated with Ohm's law：
Wherein ρ is conductor resistance rate, and l is wire total length, and s is the cross-sectional area of wire.
The calculating of inductance can be obtained according to the computing formula of flatwise coil：
Wherein a is coil mean radiuss, and c is coil thickness, and h is coil height, and N is coil turn.
In the present system, in order to form the magnetic field of high intensity, electric current as big as possible in inevitable requirement transmitting coil, is flow through,
This requires that the impedance of transmitting coil is as little as possible, is exactly necessary requirement from the enamel-covered wire compared with thick line footpath.
Blanking disc is the container of transmitting coil, it is often more important that blanking disc effectively can reduce far-field signal formation away from
From, and the direct-coupling signal effectively decayed between transmitting coil and receiving transducer, it is significant to reduce near-field signals interference.This
In embodiment, the blanking disc is double-layer shielding structure, including one layer of copper sheet layer and one layer of iron sheet layer.
From remote eddy current detection technique principle, the energy that far-field eddy signal is produced at 2-3 times of caliber accounts for leading
Status, therefore remote eddy current testing equipment is generally placed in detection coil at this, and the PCCP calibers detected by this test platform
More several meters even longer, if strict according to precursor in far field principle, the size of equipment will be difficult up to several meters
Detected in PCCP pipes, while equipment is also difficult to carry.Therefore, how to go out far field effect in limited equipment size Imitating
Should, it is a key technology for needing to solve to obtain far-field eddy signal.
Under conditions of equipment size is limited, the distance of excitation coil and receiving coil can not meet 2-3 times of caliber distance
Require, now receiving coil is in direct-coupling area, the energy come by excitation coil direct-coupling is believed much larger than far-field eddy
Number energy.One double-layer shielding device is made by the iron sheet of the copper sheet and high magnetic permeability of high conductivity, excitation coil is placed in
Dorsad, the direct-coupling path between excitation coil and receiving coil is blocked, prominent far-field eddy information makes far field distance by 2-
3 times of calibers foreshorten to 1.7 times of calibers, greatly shorten far field distance.
With regard to the receiving transducer：
The receiving transducer, it is at least to respond the eddy current signal, corresponding with the AC signal so as to induce
Voltage signal, and transmit to the detection main frame；The voltage signal includes test corresponding with the test AC signal
Voltage signal and reference synchronization voltage signal corresponding with the reference synchronization AC signal；
The receiving transducer mainly includes receiving coil and low-noise amplifier.
The same transmitting coil of development principle of receiving coil, can be using compared with fine rule from receiving coil unlike transmitting coil
The enamel-covered wire coiling in footpath, so can not only mitigate probe weight, while thinner line footpath allows the coiling in identical volume
More coil turns, from Faraday law of electromagnetic induction, can so strengthen receiving coil induced voltage, so as to improve
The sensitivity of detecting system.
Low-noise amplifier in receiving transducer so can should effectively reduce noise and do close proximity to receiving coil
Disturb.
PCCP fracture of wires detect test platform for Detection of Weak Signals equipment, and the amplitude of detection signal is too low, usually microvolt
Level level, and the uneven electrical conductivity for causing of the white noise of system itself, PCCP pipe wall materials and structure and pcrmeability change are drawn
The noise that enters, platform advance measurement when pop one's head in noise that Lift-off effect introduces and from extraneous frequency interferences, especially work
Frequency interference noise is much larger than signal level, completely useful signal is submerged in the middle of noise, how to eliminate or suppress these to make an uproar
Acoustical signal, improves signal to noise ratio, is a key technology of this platform.
This platform filters partial noise signal first by program-controlled low-noise amplifier, improves signal to noise ratio, afterwards using lock phase
The lock facies principle of amplifier, useful signal is extracted from noise signal, finally realizes that rear class is made an uproar with software processing method
The suppression of sound.
The receiving transducer is installed on the car body by a length-adjustable probe support arm.The probe support arm
Be fixed on the car body so that the receiving transducer and transmitting probe along PCCP calibers to arrangement, and further such that institute
Top of the receiving transducer on the inside of PCCP pipes is stated, transmitting probe is located at the bottom on the inside of PCCP pipes.The design of probe support arm
The spacing between transmitting-receiving probe can be easily adjusted, to adapt to the PCCP pipelines of different inner diameters.
In the present embodiment, the coiling direction of the receiving coil and transmitting coil is orthogonal.The receiving coil around
Axle center processed is horizontally disposed with, and the coiling axle center of the transmitting coil is vertically arranged.
The relevant measuring wheel：
The measuring wheel, to generate the pulse signal according to the change in location advanced.
Measuring wheel provides the pulse signal signal that triggering detection main frame collection receiving transducer is transmitted, and main control computer is also utilized
This pulse signal carries out the counting of probe vehicles distance travelled.
The relevant detection main frame：
Refer to Fig. 4, the detection main frame, at least to：
The AC signal is generated, and is exported to the transmitting probe and main control computer；
The pulse signal exported by the measuring wheel is triggered, and gathers the reference synchronization voltage signal that Jing processes and described
Test voltage signal；
The master control will be uploaded to Jing after the reference synchronization voltage signal of process with the test voltage signal processing
Computer；
Detection main frame is arranged on car body, and detection main frame and main control computer, transmitting-receiving are popped one's head in, made between battery and measuring wheel
It is attached with dismountable cable.Detection main frame major function is the powerful low-frequency ac signal of transmitting, while to penetrating
The far-field eddy signal of tube wall carries out reception collection.
Furthermore, it is understood that it is described detection main frame at least include transmitter, receiver and data collecting card, the transmitter with
Transmitting probe connection, the receiver are connected with the receiving transducer, the data collecting card respectively with the receiver
Connect with main control computer, the transmitter is also connected with the main control computer.
The transmitter, to generate AC signal, and exports to outside transmitting probe and main control computer, the friendship
Stream signal includes test AC signal and the reference synchronization AC signal for matching each other；
The receiver, to：
The reference synchronization voltage signal sensed in receiving transducer outside receiving and test voltage signal；
The signal of the data collecting card is responded, will be transmitted after the reference synchronization voltage signal and test voltage signal processing
To the data collecting card；
The reference synchronization voltage signal is corresponding with the reference synchronization current signal, the test voltage signal with it is described
Test AC signal correspondence；
The data collecting card, to：
Triggered by the pulse signal of an outside measuring wheel, the signal for gathering the transmission after the receiver is processed and coming, and
It is uploaded to the main control computer；
For further launching：
The transmitter includes signal source and power amplifier, and the signal source is to produce the AC signal；It is described
Power amplifier carries out power amplification signal is flowed to the friendship test, and by after the reference synchronization AC signal and amplification
Test AC signal transmit to the transmitting probe, be allowed to realize the transmitting of electromagnetic wave signal.
Wherein：
Fig. 5 is refer to, the signal source includes low-power scm, DDS chips, low pass filter and phase inverter, described
Low-power scm, DDS chips, low pass filter and power amplifier are sequentially connected, defeated so as to pass through the power amplifier
Go out the test AC signal；The low-power scm, DDS chips and phase inverter are sequentially connected, described anti-phase so as to pass through
Device exports reference synchronization AC signal.
Signal source produces sine wave and square-wave signal respectively as in the input and signal receiver of low-frequency power amplifier
The reference input of lock-in amplifier, i.e., respectively test AC signal and reference synchronization AC signal.From low-power consumption, high-performance side
Face considers that the system is intended adopting super low power consuming single chip processor for control chip, and low-power consumption DDS chips are just occurring chip as waveform
String ripple, square wave signal generator design
Fig. 6 is refer to, the power amplifier includes pre-amplification circuit, power amplification circuit and regulated power supply, described
AC signal sequentially passes through the pre-amplification circuit and power amplification circuit is realized amplifying, so as to by power amplification electricity
Road exports, and the regulated power supply is connected with the pre-amplification circuit and power amplification circuit respectively.
The effect of power amplifier is that the sine wave signal to signal source output carries out power amplification and drives transmitting coil
Electromagnetic signals.The amplifier is mainly made up of pre-amplification circuit, power amplification circuit and regulated power supply.Preposition amplification
Circuit mainly completes small signal and amplifies task, while requiring low noise, Low Drift Temperature.Power amplification circuit is mainly being permitted
Perhaps in distortion limit, expeditiously sufficiently large power is provided to load as far as possible, it is desirable to be that output is big, efficiency will
It is high.Regulated power supply mainly provides galvanic current source for preamplifier, power amplifier.
Pre-amplification circuit is constituted using the integrated circuit of low noise, high-gain.According to bandwidth, voltage gain, conversion speed
The indexs such as rate, noise and current drain select suitable integrated operational amplifier to build.
Power amplification circuit is built using integrated power amplifying circuit.Integrated amplifier circuit is ripe, small volume, low frequency performance
Good, indoor design has complex protection circuit, can increase the reliability of its work, while peripheral circuit is simple, defencive function
It is complete.In the design of this instrument, because the low frequency signal that can penetrate thick steel cylinder will be produced, power requirement is higher, and caloric value is very
Greatly, so radiator must be added.
Regulated power supply provides energy for whole power amplifier.According to pre-amplification circuit and the demand of power amplification circuit,
The each road power supply needed for the output of three-terminal voltage-stabilizing circuit group can be adopted.
The receiver to：
The reference synchronization voltage signal sensed in a receiving transducer outside receiving and test voltage signal；
The signal of the data collecting card is responded, will be transmitted after the reference synchronization voltage signal and test voltage signal processing
To the data collecting card；
The reference synchronization voltage signal is corresponding with the reference synchronization current signal, the test voltage signal with it is described
Test AC signal correspondence；
Due to this instrument it is to be detected be the very faint signal that penetrates steel cylinder twice, so receiver is substantially main
It is made up of lock-in amplifier.The advantage of lock-in amplifier is the faint letter that can be tested with very noisy and jamming pattern
Number.Extracted from prime low noise amplifier output signal using two-phase lock-in amplifier in this instrument and reference signal is with frequency
Secondary induced signal, and after filtered amplification formed two-way direct current signal to data collecting card.
In the present embodiment, the receiver includes lock-in amplifier, and the receiving transducer includes receiving coil and low noise
Low noise described in Jing is put successively for amplifier, test voltage signal that receiving coil described in Jing is sensed and reference synchronization voltage signal
Big device and lock-in amplifier are input to the data collecting card after processing.The test voltage signal that receiving coil described in Jing is sensed
The data collecting card is input to after reference synchronization voltage signal lock-in amplifier extraction process described in.
Fig. 7 is refer to, the lock-in amplifier includes signalling channel, reference channel and double associated processing circuits, the survey
Signalling channel described in examination voltage signal Jing is input into described pair of associated processing circuit, refers to described in the reference synchronization voltage signal Jing
Passage is input into described pair of associated processing circuit, so as to export after the extraction process of double associated processing circuits described in.
Described pair of associated processing circuit includes homophase correlator and quadricorrelator, two inputs of the homophase correlator
End is respectively connecting to the reference channel and signalling channel, and two inputs of the quadricorrelator are respectively connecting to the ginseng
Examine passage and signalling channel, the homophase correlator and quadricorrelator outfan connect respectively in-phase component output port and
Quadrature component output port, the in-phase component output port and quadrature component output port are connected with the data collecting card.
The homophase correlator and quadricorrelator include the multiplier and low pass filter of series connection, each described multiplication
Two inputs of device are respectively connecting to the reference channel and signalling channel, and the outfan of two multipliers connects respectively
One end of the corresponding low pass filter, the other end connection of the low pass filter in the homophase correlator are described same
Phase component output port, the other end of the low pass filter in the quadricorrelator connect the quadrature component outfan
Mouthful.
The other end of the low pass filter in the homophase correlator is also connected with a vector arithmetic unit；The orthorhombic phase
The other end for closing the low pass filter in device is also connected with the vector arithmetic unit.
The reference channel is provided with zero passage shaping circuit, harmonic circuit, fine tuning phase instrument and phase lock circuitry, the synchronization
Reference voltage signal is input into the two-phase and closes after sequentially passing through zero shaping circuit, harmonic circuit, fine tuning phase instrument and phase lock circuitry
Process circuit.Reference signal from signal source is processed into the same frequency square wave of correlator requirement for the design.Reference signal is passed through
Zero is shaped to the pulse signal with reference signal with frequency, is sent to harmonic circuit, according to measurement needs, produces corresponding harmonic wave.Send
To the fine tuning phase-shifter that can produce 0-100 ° of phase shift, phase shift output is sent to phase lock circuitry generation frequency multiplication and quadrature square wave forms electricity
Road, produces the 1 of 90 ° of two-way phase contrast：1 dutycycle square wave, quadrature square wave form circuit and can produce 0 °, 90 °, 180 °, 270 °
Phase shift, can produce 0-360 ° of phase shift with reference to the regulation of prime 0-100 ° phase-shifter, meet lock-in amplifier to phase-adjusted
Need.
Two-phase relevant treatment part is the core of lock-in amplifier, carries out relevant treatment to measured signal, realize from
The signal of needs is detected in noise or interference signal background.Mainly it is made up of multiplier and low pass filter, this unit contains
Two correlators, are homophase correlator all the way, and another road is quadricorrelator.Homophase point of two output voltages for measured signal
Amount VxWith quadrature component Vy。
Due to the decay of PCCP tube steel barrels, the far-field eddy signal that receiving coil is induced is extremely faint, system
The electromagnetic interference noise in the noise even external world that the noise of itself, test platform shake are introduced all may be bigger than detection signal multiple
The order of magnitude, among useful signal all may be submerged in noise, therefore the far field whirlpool needed for how extracting in the middle of very noisy
Stream signal is a key technology of relation test platform normal work.
Lock-in amplifier is presently most used Feeble signal detector device, it using and measured signal have same frequency and
The reference signal of phase relation as benchmark, only to measured signal itself and those with reference signal with frequently (or again
Frequently), the noise component(s) of homophase has response.Accordingly, it is capable to significantly suppress useless noise, improve detection signal-to-noise ratio.Therefore intend adopting
Far-field eddy signal extraction technology of the phase lock amplifying technology as the system.
The data collecting card, to：
Triggered by the pulse signal of an outside measuring wheel, the signal for gathering the transmission after the receiver is processed and coming, and
It is uploaded to the main control computer；Specifically, data acquisition is stuck on main control computer under the control of data acquisition software, by
The pulse signal triggering collection process of measuring wheel, carries out Real-time Collection to the two paths of signals of lock-in amplifier output, and collection
Data upload to main control computer.
The detection main frame also includes power module and energy supply control module, refer to Fig. 8, the energy supply control module bag
Include charger, detection resistance and battery monitor chip, the battery monitor chip respectively with an accumulator and detection resistance
Connection, the charger and detection resistance be connecteds with the accumulator, the battery monitor chip also pass through single-chip microcomputer and
The main control computer connection.
The single Power convert that accumulator is provided is output as detecting what main frame and main control computer needed by power module
The power supply of various magnitudes of voltage.
In the present system, accumulator is the power supply of long period, is the stability for ensureing electricity system, to accumulator
The monitoring of dump energy is a critically important job.The energy supply control module of the accumulator of the system design, in accumulator
A detection resistance is sealed between negative pole and battery monitor chip, can be to accumulator high accuracy, in real time on-line monitoring storage
The information such as battery dump energy, current voltage, battery temperature, single-chip microcomputer can read battery under the control of main control computer
Current state information, uploads to main control computer, carries out real-time online by the data acquisition software of main control computer and shows.
Interface about detecting main frame, power interface are the power inlets for detecting main frame, and accumulator is by power interface
Detection host supplying power is given, while power interface also exports DC voltage for master control computer power supply；Transmitting output interface is detection
The outlet of main frame transmission signal, detection main frame pass through this interface driver transmitting probe；Receives input interface is that detection main frame connects
The input port of the collection of letters number, the signal of receiving transducer enter detection main frame by this interface and are received by receiver；Control interface is
Detection main frame and main control computer carry out the passage of signal interaction and data transfer, and main control computer is visited by this Interface Controller
Survey the signal transmitting and data acquisition of main frame.
The main control computer, at least to：
The artificial input of response automatically controls the running for detecting main frame according to presupposed information；
The artificial input of response automatically processes from the detection main frame signal for receiving according to presupposed information；
So as to storing and showing testing result.
Main control computer runs PCCP data acquisition softwares, and the operation of control detection main frame carries out the data for collecting
Storage.
Main control computer is intended using light industrial panel computer.Main control computer main feature is as follows：
1. it is input into touch control manner, without the need for external access of mouse keyboard, is easy to operate in PCCP pipeline environments；
2. screen intensity scalable, is adapted to different lightness environment；
3. low in energy consumption, it is adapted to battery powered mode and works；
4. compact structure is compact, and external cable is few, is adapted to work in the industrial environments such as vibrations, humidity.
PCCP fracture of wire detector softwares are run in main control computer, mainly realize System self-test, Data acquisition and storage,
The functions such as system running state monitoring.
PCCP fracture of wires inspection software automatic running after main control computer start, immediately begins to all parts to instrument
Self-inspection is carried out, if any part is faulty, a Trouble Report can not will be generated by self-inspection, data acquisition software,
Equipment fault position is pointed out, then stops the operation of program.
If each component working of instrument is normal, self-inspection passes through, and software enters data acquisition and plays point selection state, now soft
By the data for collecting, part judges whether instrument is in the interface position in 2-section pipe road, if it is, prompting operator couple
Data acquisition starting point is named, and name is finished, and the starting point determination of data acquisition enters data acquisition flow.
In data acquisition flow, data acquisition software stores the pipeline data along the line that detection main frame is collected,
Instrument running status is shown --- instrument propulsion real-time speed, real-time mileage number, the real-time battery electric quantity of instrument and instrument
The video image of device advance route road conditions is all displayed in software main interface in real time.During data acquisition, if instrument
The excessive velocities of propulsion, data acquisition software can send alarm, notify that operator reduce pace in time.
When operator click on terminates collection button, instrument can terminate at a nearest pipe joint of front automatically
Data acquisition, data acquisition flow terminate.
In summary, when system of the invention is carried out in the PCCP pipelines at a slow speed, signal source is preset by control process software
Parameter produce the sinusoidal signal of fixed frequency and amplitude, sinusoidal signal produces friendship by transmitting coil Jing after low-frequency power amplifier amplification
The low frequency magnetic field of change, induces the eddy current signal that can penetrate tube wall on PCCP tube walls, and this eddy current signal is along outer tube wall and pipe
Compressor wire outside wall is propagated, and is penetrated tube wall again in the opposite side of tube wall and is entered in PCCP pipelines, and signal source also simultaneously
The lock-in amplifier of output synchronous reference signal to receiving unit is input into as reference signal.
The far-field eddy signal for penetrating tube wall can induce faint voltage signal, this voltage signal in receiving coil
Lock-in amplifier is sent to Jing after low-noise amplifier amplifies, lock-in amplifier is according to the frequency and phase place of reference signal again to this
One voltage signal is filtered purification, further amplifies, the collection of Jing data collecting cards.
Measuring wheel is carried out with test platform and is rolled, and produces a series of pulse signal, and trigger data acquisition card is to locking phase
The signal that amplifier sends is acquired.The data that data collecting card is collected upload to computer, are carried out by computer
Storage and display.The pulse signal for being produced according to measuring wheel simultaneously can calculate the more specific location information of current test platform.
When fracture of wire occurs in PCCP, the far-field eddy signal that penetrates tube wall twice can be produced abnormal in amplitude and phase place
Become, using this phenomenon, it is possible to realize judging the radical and circuit wire position of PCCP fracture of wires.
In sum, the present invention considers transmitting probe and receiving transducer direct-coupling under conditions of equipment size is limited
Energy of the energy for coming over much larger than far-field eddy signal.By the setting of blanking disc, can decay or block transmitting probe and
Between receiving transducer, i.e., the direct-coupling path between excitation coil and receiving coil, prominent far-field eddy information, make far field away from
From much smaller than 2-3 times of caliber.Additionally, present invention further introduces measuring wheel, change in location of the collection of data with system is contacted
Get up, so that Detection results are more preferably.
Claims (10)
1. a kind of PCCP steel wires fracture of wire detecting system, including main control computer, detection main frame, receiving transducer, transmitting probe, car body
And measuring wheel, the main control computer, detection main frame, receiving transducer, transmitting probe and measuring wheel on the car body and
Together advance with the car body, the receiving transducer, transmitting probe and measuring wheel, main control computer are connected with the detection main frame
Connect；
The transmitting probe includes transmitting coil and blanking disc, and the transmitting coil is located in the blanking disc, the emission lines
Circle, at least to respond the AC signal that the detection main frame is input into, launches corresponding electromagnetic wave signal, so as in PCCP tube walls
On induce eddy current signal；The blanking disc is at least used for the direct-coupling letter decayed between the transmitting coil and receiving transducer
Number；The AC signal includes the test AC signal and reference synchronization AC signal for matching each other；
The receiving transducer, at least to respond the eddy current signal, so as to induce the electricity corresponding with the AC signal
Pressure signal, and transmit to the detection main frame；The voltage signal includes test voltage corresponding with the test AC signal
Signal and reference synchronization voltage signal corresponding with the reference synchronization AC signal；
The detection main frame, at least to：
The AC signal is generated, and is exported to the transmitting probe and main control computer；
Triggered by the pulse signal that the measuring wheel is exported, gather the reference synchronization voltage signal and the test that Jing is processed
Voltage signal；
The master control will be uploaded to calculate Jing after the reference synchronization voltage signal of process with the test voltage signal processing
Machine；
The main control computer, at least to：
The artificial input of response automatically controls the running for detecting main frame according to presupposed information；
The artificial input of response automatically processes from the detection main frame signal for receiving according to presupposed information；
So as to storing and showing testing result；
The measuring wheel, to generate the pulse signal according to the change in location advanced.
2. PCCP steel wires fracture of wire detecting system as claimed in claim 1, it is characterised in that：The blanking disc is tied for double layer screen
Structure, including one layer of copper sheet layer and one layer of iron sheet layer.
3. PCCP steel wires fracture of wire detecting system as claimed in claim 1, it is characterised in that：The transmitting probe passes through a length
Adjustable probe support arm is installed on the car body.
4. PCCP steel wires fracture of wire detecting system as claimed in claim 3, it is characterised in that：The support arm is fixed at described
On car body so that the receiving transducer and transmitting probe along PCCP calibers to arrangement, and the further such that receiving transducer position
Top on the inside of PCCP pipes, transmitting probe are located at the bottom on the inside of PCCP pipes.
5. PCCP steel wires fracture of wire detecting system as claimed in claim 1, it is characterised in that：The detection main frame at least includes sending out
Machine, receiver and data collecting card are penetrated, the transmitter is connected with the transmitting probe, the receiver and the receiving transducer
Connection, the data collecting card is connected with the receiver and main control computer respectively, the transmitter also with the master control meter
Calculation machine connects.
6. PCCP steel wires fracture of wire detecting system as claimed in claim 5, it is characterised in that：The transmitter include signal source and
Power amplifier, the signal source is to produce the AC signal；The power amplifier is to the test exchange letter
Number carry out power amplification, and the test AC signal by the reference synchronization AC signal and after amplifying is transmitted to the transmitting and visited
Head, is allowed to realize the transmitting of electromagnetic wave signal.
7. PCCP steel wires fracture of wire detecting system as claimed in claim 6, it is characterised in that：The signal source includes low-power consumption list
Piece machine, DDS chips, low pass filter and phase inverter, the low-power scm, DDS chips, low pass filter and power amplification
Device is sequentially connected, so as to export the test AC signal by the power amplifier；The low-power scm, DDS cores
Piece and phase inverter are sequentially connected, so as to pass through the phase inverter output reference synchronization AC signal.
8. PCCP steel wires fracture of wire detecting system as claimed in claim 6, it is characterised in that：The power amplifier includes preposition
Amplifying circuit, power amplification circuit and regulated power supply, the AC signal sequentially passes through the pre-amplification circuit and power is put
Big circuit realiration amplifies, and exports so as to pass through the power amplification circuit, and the regulated power supply is electric with the preposition amplification respectively
Road and power amplification circuit connection.
9. PCCP steel wires fracture of wire detecting system as claimed in claim 5, it is characterised in that：The receiver includes that lock mutually amplifies
Device, the receiving transducer include receiving coil and low-noise amplifier, the test voltage signal that receiving coil described in Jing is sensed
The data acquisition is input to after reference synchronization voltage signal successively low-noise amplifier and lock-in amplifier process described in
Card.
10. PCCP steel wires fracture of wire detecting system as claimed in claim 5, it is characterised in that：The detection main frame also includes electricity
Source control module, the energy supply control module include charger, detection resistance and battery monitor chip, the battery monitor
Chip is connected with an accumulator and detection resistance respectively, and the charger and detection resistance are connected with the accumulator, described
Battery monitor chip is also connected with the main control computer by single-chip microcomputer.
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Families Citing this family (9)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106501355A (en) * | 2016-12-14 | 2017-03-15 | 中国计量大学 | A kind of metallic conduit defect detecting device based on far-field eddy |
| CN108957566B (en) * | 2018-04-13 | 2020-07-28 | 赣州毫厘测绘信息技术有限公司 | Sealing probe of high-sensitivity high-anti-interference pipeline detector |
| CN108956752A (en) * | 2018-05-22 | 2018-12-07 | 中国水利水电科学研究院 | PCCP pipeline compressor wire number of breaks detection system and method |
| CN108982649B (en) * | 2018-05-22 | 2020-06-26 | 中国水利水电科学研究院 | PCCP pipeline prestressed wire broken wire detection system and method |
| CN109507283A (en) * | 2018-11-22 | 2019-03-22 | 天津大学 | A kind of PCCP pipeline steel wire fracture of wire far-field vortex checking method |
| CN110018228B (en) * | 2019-04-26 | 2024-02-27 | 中国水利水电科学研究院 | System, method and device for detecting broken wire position of embedded PCCP (prestressed concrete cylinder pipe) |
| CN109916999A (en) * | 2019-04-28 | 2019-06-21 | 中国水利水电科学研究院 | A kind of reinforcing bar damage detection method, apparatus and system |
| CN111351846A (en) * | 2020-03-18 | 2020-06-30 | 南京理工大学 | Intelligent detection device based on far-field eddy current |
| CN116299721A (en) * | 2023-05-16 | 2023-06-23 | 北京市水科学技术研究院 | PCCP broken wire multichannel electromagnetic detection system and method |
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