CN104280453A - System applied to detection of broken PCCP (Prestressed Concrete Cylinder Pipe) steel wires - Google Patents
System applied to detection of broken PCCP (Prestressed Concrete Cylinder Pipe) steel wires Download PDFInfo
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Abstract
The invention provides a system applied to detection of broken PCCP (Prestressed Concrete Cylinder Pipe) steel wires. The system comprises a main control computer, a detection host, a receiving probe, a transmitting probe, a vehicle body and a distance measuring wheel, wherein the main control computer, the detection host, the receiving probe, the transmitting probe and the distance measuring wheel are arranged on the vehicle body and move along with the vehicle body; the receiving probe, the transmitting probe, the distance measuring wheel and the main control computer are connected with the detection host; the transmitting probe comprises a transmitting coil and a shielding plate; the transmitting coil is arranged in the shielding plate; the shielding plate is at least used for attenuating direct coupling signals between the transmitting coil and the receiving probe; the distance measuring wheel is used for generating pulse signals according to progressing position change; the detection host is at least triggered by the pulse signals output by the distance measuring wheel and is used for acquiring synchronous reference signals and processed voltage signals.
Description
Technical field
The present invention relates to concrete field, particularly relate to a kind of PCCP steel wire yarn break inspect system.
Background technology
PCCP pipe (Prestressed Concrete Cylinder Pipe) is the abbreviation of the prestressed concrete pipe of band steel cylinder; use heavy caliber, high pressure resistant tubing widely in the world at present; by be embedded into thin steel cylinder tube core, be entangled in the compressor wire (diameter) outside tube core and the cement mortar protective course outside steel wire forms, as shown in Figure 1.The two ends of pipe are welded with socket ring and the socket circle of steel respectively, and the flexible joint of pipe adopts slip rubber sealing.In working order, the thin steel cylinder be embedded in the pipe wall has impervious function, the concrete wall being wrapped in compressor wire outside tube core and tube core bears internal water pressure and the external load of tubing, and therefore PCCP pipe is a kind of pipe kind combined with the advantage of common prestressed concrete pipe by steel pipe.
In far-field eddy transformer coupled (RFECTC) technology adopts, probe mode detects metal pipe material, the feature of this technology is to check ferrous material, can nonferrous materials be checked again, and to inside or the abnormal conditions of outside there is identical sensitivity.The entirety adopting single probe just can detect pit, crackle and tube wall is thinning.
Adopt a drive coil in tube wall, induce the eddy current of circumference with low level of magnetization, different from more conventional EDDY CURRENT, magnetic test coil is placed on apart from drive coil 2 ~ 3 times of caliber places along pipeline by this technology, and detector signal is often used as the tolerance of tube wall characteristic relative to the phase place of drive coil.
The drive coil driven by the sinusoidal signal that frequency is quite low, the built-in field produced in the duct, the region of three different in kinds can be divided on the both sides of drive coil, these regions are called as direct-coupling district, zone of transition and far-field region, as shown in Figure 1, the transformer coupled know-why schematic diagram of far-field eddy.
Although how much be subject to the impact that pipeline exists, a simple transformer, mainly from the coupling that drive coil is directly aimed at, plays in direct-coupling district.The intensity of direct-drive is very large near drive coil, but increases with the distance apart from drive coil and decay rapidly, and most eddy-current instrument is operated in this direct-drive district or near field region.But under the condition that equipment size is limited, the distance of drive coil and receiving coil can not meet the required distance of 2-3 times of caliber, just cannot realize effective yarn break inspect.
Summary of the invention
The technical problem to be solved in the present invention realizes the yarn break inspect of PCCP pipe under the limited condition of equipment size.
In order to solve this technical matters, the invention provides a kind of PCCP steel wire yarn break inspect system, comprise main control computer, detection main frame, receiving transducer, transmitting probe, car body and measuring wheel, described main control computer, detection main frame, receiving transducer, transmitting probe and measuring wheel to be all located on described car body and together to advance with described car body, and described receiving transducer, transmitting probe and measuring wheel, main control computer are all connected with described detection main frame;
Described transmitting probe comprises transmitting coil and blanking disc, described transmitting coil is located in described blanking disc, described transmitting coil, at least in order to respond the AC signal of described detection main frame input, launch corresponding electromagnetic wave signal, thus induce eddy current signal on PCCP tube wall; The direct-coupling signal of described blanking disc at least for decaying between described transmitting coil and receiving transducer; Described AC signal includes the test AC signal and reference synchronization AC signal that match each other;
Described receiving transducer, at least in order to respond described eddy current signal, thus induces the voltage signal corresponding with described AC signal, and transfers to described detection main frame; Described voltage signal comprises the test voltage signal corresponding with described test AC signal and the reference synchronization voltage signal corresponding with described reference synchronization AC signal;
Described detection main frame, at least in order to:
Generate described AC signal, and export described transmitting probe and main control computer to;
The pulse signal exported by described measuring wheel triggers, and gathers treated described reference synchronization voltage signal and described test voltage signal;
Described main control computer is uploaded to by after treated described reference synchronization voltage signal and described test voltage signal transacting;
Described main control computer, at least in order to:
The artificial input of response or foundation presupposed information control the running of described detection main frame automatically;
The artificial input of response or foundation presupposed information process the signal received from described detection main frame automatically;
Thus store and show testing result;
Described measuring wheel, in order to generate described pulse signal according to the change in location of advancing.
Described blanking disc is double-layer shielding structure, comprises one deck copper sheet layer and one deck iron sheet layer.
Described transmitting probe is installed on described car body by a length-adjustable probe support arm.
Described sway brace is fixed on described car body, makes described receiving transducer and transmitting probe along PCCP caliber to arrangement, and makes described receiving transducer be positioned at top inside PCCP pipe further, and transmitting probe is positioned at the bottom inside PCCP pipe.
Described detection main frame at least comprises transmitter, receiver and data collecting card, described transmitter is connected with described transmitting probe, described receiver is connected with described receiving transducer, described data collecting card is connected with described receiver and main control computer respectively, and described transmitter is also connected with described main control computer.
Described transmitter comprises signal source and power amplifier, and described signal source is in order to produce described AC signal; Described reference synchronization AC signal and the test AC signal after amplifying in order to carry out power amplification to described alternating-current measurement stream signal, and are transferred to described transmitting probe by described power amplifier, make it the transmitting realizing electromagnetic wave signal.
Described signal source comprises low-power scm, DDS chip, low-pass filter and phase inverter, and described low-power scm, DDS chip, low-pass filter are connected successively with power amplifier, thus exports described test AC signal by described power amplifier; Described low-power scm, DDS chip are connected successively with phase inverter, thus export reference synchronization AC signal by described phase inverter.
Described power amplifier comprises pre-amplification circuit, power amplification circuit and stabilized voltage supply, described AC signal realizes amplifying through described pre-amplification circuit and power amplification circuit successively, thus exported by described power amplification circuit, described stabilized voltage supply is connected with described pre-amplification circuit and power amplification circuit respectively.
Described receiver comprises lock-in amplifier, described receiving transducer comprises receiving coil and low noise amplifier, and the test voltage signal sensed through described receiving coil and reference synchronization voltage signal are input to described data collecting card successively after described low noise amplifier and lock-in amplifier process.
Described detection main frame also comprises energy supply control module, described power module comprises charger, accumulator, detection resistance and battery monitor chip, described battery monitor chip is respectively with described accumulator with detect resistance and be connected, described charger is all connected with described accumulator with detection resistance, and described battery monitor chip is also connected with described main control computer by single-chip microcomputer.
The present invention considers energy that transmitting probe and receiving transducer direct-coupling the come energy much larger than far-field eddy signal under the limited condition of equipment size.By the setting of blanking disc, can decay or block between transmitting probe and receiving transducer, the direct-coupling path namely between drive coil and receiving coil, outstanding far-field eddy information, makes far field distance be less than 2-3 times of caliber.In addition, present invention further introduces measuring wheel, the collection of data and the change in location of system are connected, thus makes Detection results better.
Accompanying drawing explanation
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 yarn break inspect system in one embodiment of the invention;
Fig. 3 is the structural representation of PCCP steel wire yarn break inspect system in one embodiment of the invention;
Fig. 4 is the structural representation detecting 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.
Embodiment
Below with reference to Fig. 1 to Fig. 8, PCCP steel wire yarn break inspect system provided by the invention is described in detail, it is the present invention one optional embodiment, can think, those skilled in the art can modify to it and polish in the scope not changing the present invention's spirit and content.
Present embodiments provide a kind of PCCP steel wire yarn break inspect system, please refer to Fig. 2 and Fig. 3, comprise main control computer, detection main frame, receiving transducer, transmitting probe, car body and measuring wheel, described main control computer, detection main frame, receiving transducer, transmitting probe and measuring wheel to be all located on described car body and together to advance with described car body, and described receiving transducer, transmitting probe and measuring wheel, main control computer are all connected with described detection main frame.
The present invention is the improvement carried out detection system, mainly stresses the process that detects and equipment, and how to compare process as detecting the final curves, the signal that obtain, genus this area conventional means, so do not do concrete elaboration.
About described transmitting probe:
Described transmitting probe comprises transmitting coil and blanking disc, described transmitting coil is located in described blanking disc, described transmitting coil, at least in order to respond the AC signal of described detection main frame input, launch corresponding electromagnetic wave signal, thus induce eddy current signal on PCCP tube wall; The direct-coupling signal of described blanking disc at least for decaying between described transmitting coil and receiving transducer; Described AC signal includes the test AC signal and reference synchronization AC signal that match each other; According to the effect of blanking disc, can know its concrete shape and the spatial relationship between itself and transmitting coil, be as the criterion can realize decay direct-coupling signal.
Transmitting coil is a kind of transducer, the AC signal that low-frequency power amplifier exports is converted to electromagnetic wave signal and launches, PCCP tube wall induces eddy current signal.
Transmitting coil requires to have high energy conversion efficiency and low energy loss, namely requires higher quality factor (Q), usually selects the wire of coiling according to frequency of operation.The telefault of low-frequency range work should adopt the wire coiling of the tape insulations such as enameled wire.For the telefault of frequency of operation between tens kilo hertzs to two megahertzes, split conductor coiling should be adopted, to increase conductor net sectional area, reduce the impact of kelvin effect, Q value can be made to improve 30%-40%.For the telefault of frequency of operation higher than 2MHz, should adopt the coiling of sub-thread heavy gauge wire, the diameter of wire is generally between 0.3-1.5mm.The frequency of operation of native system is lower, therefore selects enameled wire as the wire of coiling.
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, good directionality, and the shape of its inductive mode is as same corn, and it makes and processes also fairly simple simultaneously.Another large feature of single loop coil is easy to parameter calculate, and be conducive to carrying out analytical type design, its impedance can be expressed as:
Z＝R+jωL (1)
Real part is direct current resistance, and available Ohm law calculates:
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 pancake coil:
Wherein a is coil mean radius, 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 strength, flow through electric current large as far as possible in inevitable requirement transmitting coil, this just requires that the impedance of transmitting coil is little as far as possible, and selecting compared with the enameled wire in thick line footpath is exactly necessary requirement.
Blanking disc is the container of transmitting coil, the more important thing is that blanking disc effectively can reduce the distance of far-field signal formation, and the direct-coupling signal between effective decay transmitting coil and receiving transducer, the significant near-field signals that reduces is disturbed.In the present embodiment, described blanking disc is double-layer shielding structure, comprises one deck copper sheet layer and one deck iron sheet layer.
From remote eddy current detection technique principle, the energy that far-field eddy signal produces at 2-3 times of caliber place is occupied an leading position, therefore magnetic test coil is placed in this place by remote eddy current checkout equipment usually, and the PCCP caliber that this test platform detects is generally a bit several meters even longer, if strict with precursor in far field principle, then the size of equipment will reach several meters, not easily detect in PCCP pipe, and equipment is also difficult to carry simultaneously.Therefore, how to draw up far-field effect at limited equipment size counterdie, obtaining far-field eddy signal is the gordian technique needing to solve.
Under the condition that equipment size is limited, the distance of drive coil and receiving coil can not meet 2-3 times of caliber required distance, and now receiving coil is in direct-coupling district, and the energy of being come by drive coil direct-coupling is much larger than the energy of far-field eddy signal.A double-layer shielding device is made by the copper sheet of high conductivity and the iron sheet of high magnetic permeability, be placed in drive coil dorsad, block the direct-coupling path between drive coil and receiving coil, outstanding far-field eddy information, make far field distance foreshorten to 1.7 times of calibers by 2-3 times of caliber, greatly shorten far field distance.
About described receiving transducer:
Described receiving transducer, at least in order to respond described eddy current signal, thus induces the voltage signal corresponding with described AC signal, and transfers to described detection main frame; Described voltage signal comprises the test voltage signal corresponding with described test AC signal and the reference synchronization voltage signal corresponding with described reference synchronization AC signal;
Described receiving transducer mainly comprises receiving coil and low noise amplifier.
The same transmitting coil of development principle of receiving coil, enameled wire coiling compared with fine line diameter can be adopted unlike receiving coil with transmitting coil, so not only probe weight can be alleviated, simultaneously thinner wire diameter allows the more coil turn of coiling in identical volume, from Faraday's electromagnetic induction law, receiving coil induced voltage can be strengthened like this, thus improve the sensitivity of detection system.
Low noise amplifier in receiving transducer should be tried one's best near receiving coil, like this can effectively noise decrease interference.
PCCP yarn break inspect test platform is Detection of Weak Signals equipment, the amplitude of detection signal is too low, be generally microvolt level level, and the noise that the uneven conductivity that causes of the white noise of system itself, PCCP pipe wall material and structure and magnetic permeability change are introduced, platform are advanced noise that when measuring, probe Lift-off effect is introduced and the frequency interferences from the external world, especially Hz noise noise is all much larger than signal level, completely useful signal is submerged in the middle of noise, how to eliminate or to suppress these noise signals, improving signal to noise ratio (S/N ratio), is a gordian technique of this platform.
This platform is first by program-controlled low-noise amplifier, and filtering partial noise signal, improve signal to noise ratio (S/N ratio), the rear phase-locked principle utilizing lock-in amplifier, extracts useful signal, finally realize the suppression of rear class noise with software processing method from noise signal.
Described receiving transducer is installed on described car body by a length-adjustable probe support arm.Described probe support arm is fixed on described car body, makes described receiving transducer and transmitting probe along PCCP caliber to arrangement, and makes described receiving transducer be positioned at top inside PCCP pipe further, and transmitting probe is positioned at the bottom inside PCCP pipe.The design of probe support arm can regulate the spacing between transmitting-receiving probe easily, to adapt to the PCCP pipeline of different inner diameters.
In the present embodiment, the coiling direction of described receiving coil and transmitting coil is orthogonal.The coiling axle center of described receiving coil is horizontally disposed with, and the coiling axle center of described transmitting coil is vertically arranged.
Relevant described measuring wheel:
Described measuring wheel, in order to generate described pulse signal according to the change in location of advancing.
Measuring wheel provides the pulse signal trigger detection main frame collection signal that receiving transducer transmits, and main control computer also utilizes this pulse signal to carry out the counting of probe vehicles distance travelled.
Relevant described detection main frame:
Please refer to Fig. 4, described detection main frame, at least in order to:
Generate described AC signal, and export described transmitting probe and main control computer to;
The pulse signal exported by described measuring wheel triggers, and gathers treated described reference synchronization voltage signal and described test voltage signal;
Described main control computer is uploaded to by after treated described reference synchronization voltage signal and described test voltage signal transacting;
Detection main frame is arranged on car body, detection main frame and main control computer, receives and dispatches and pops one's head in, uses dismountable cable to be connected between battery and measuring wheel.Detection main frame major function launches powerful low-frequency ac signal, carries out reception collection to the far-field eddy signal penetrating tube wall simultaneously.
Furthermore, described detection main frame at least comprises transmitter, receiver and data collecting card, described transmitter is connected with described transmitting probe, described receiver is connected with described receiving transducer, described data collecting card is connected with described receiver and main control computer respectively, and described transmitter is also connected with described main control computer.
Described transmitter, in order to generate AC signal, and export outside transmitting probe and main control computer to, described AC signal comprises the test AC signal and reference synchronization AC signal that match each other;
Described receiver, in order to:
Receive the reference synchronization voltage signal and test voltage signal that sense in outside receiving transducer;
Respond the signal of described data collecting card, transfer to described data collecting card by after this reference synchronization voltage signal and test voltage signal transacting;
Described reference synchronization voltage signal is corresponding with described reference synchronization current signal, and described test voltage signal is corresponding with described test AC signal;
Described data collecting card, in order to:
Triggered by the pulse signal of an outside measuring wheel, gather the transmission after described receiver process and the signal that comes, and be uploaded to described main control computer;
Launch further again:
Described transmitter comprises signal source and power amplifier, and described signal source is in order to produce described AC signal; Described reference synchronization AC signal and the test AC signal after amplifying in order to carry out power amplification to described friendship test stream signal, and are transferred to described transmitting probe by described power amplifier, make it the transmitting realizing electromagnetic wave signal.
Wherein:
Please refer to Fig. 5, described signal source comprises low-power scm, DDS chip, low-pass filter and phase inverter, described low-power scm, DDS chip, low-pass filter are connected successively with power amplifier, thus export described test AC signal by described power amplifier; Described low-power scm, DDS chip are connected successively with phase inverter, thus export reference synchronization AC signal by described phase inverter.
Signal source produces the sinusoidal wave and square-wave signal reference input respectively as lock-in amplifier in the input of low-frequency power amplifier and signal receiver, is namely respectively and tests AC signal and reference synchronization AC signal.From the viewpoint of low-power consumption, high-performance, native system intend adopt super low power consuming single chip processor be control chip, low-power consumption DDS chip as waveform generation chip sine wave, square wave signal generator design
Please refer to Fig. 6, described power amplifier comprises pre-amplification circuit, power amplification circuit and stabilized voltage supply, described AC signal realizes amplifying through described pre-amplification circuit and power amplification circuit successively, thus exported by described power amplification circuit, described stabilized voltage supply is connected with described pre-amplification circuit and power amplification circuit respectively.
The effect of power amplifier is that the sine wave signal that signal source exports is carried out to power amplification and drives transmitting coil electromagnetic signals.This amplifier forms primarily of pre-amplification circuit, power amplification circuit and stabilized voltage supply.Pre-amplification circuit mainly completes small signal and amplifies task, requires low noise, Low Drift Temperature simultaneously.Power amplification circuit mainly, in the distortion limit allowed, provides enough large power to load as far as possible expeditiously, and requirement is that output power wants large, efficiency wants high.Stabilized voltage supply is mainly for prime amplifier, power amplifier provide galvanic current source.
Pre-amplification circuit adopts the integrated circuit of low noise, high-gain to form.Build according to the integrated operational amplifier that the choose targets such as bandwidth, voltage gain, switching rate, noise and current drain are suitable.
Power amplification circuit adopts integrated power amplifying circuit to build.Integrated amplifier circuit is ripe, and volume is little, and low frequency performance is good, and indoor design has complex protection circuit, can increase the reliability of its work, and peripheral circuit is simple simultaneously, and defencive function is complete.In the design of this instrument, because will produce the low frequency signal that can penetrate thick steel cylinder, power requirement is higher, and thermal value is very large, so must add heating radiator.
Stabilized voltage supply provides energy for whole power amplifier.The demand of foundation pre-amplification circuit and power amplification circuit, can adopt each road power supply needed for the output of three-terminal voltage-stabilizing circuit group.
Described receiver in order to:
Receive the reference synchronization voltage signal and test voltage signal that sense in an outside receiving transducer;
Respond the signal of described data collecting card, transfer to described data collecting card by after this reference synchronization voltage signal and test voltage signal transacting;
Described reference synchronization voltage signal is corresponding with described reference synchronization current signal, and described test voltage signal is corresponding with described test AC signal;
What will detect due to this instrument is the very faint signal penetrating steel cylinder for twice, so receiver forms primarily of lock-in amplifier in fact.The advantage of lock-in amplifier is the feeble signal that can be tested with in very noisy and jamming pattern.In this instrument, adopt two-phase lock-in amplifier to extract from prime low noise amplifier output signal and the same secondary induced signal frequently of reference signal, and after filter and amplification, form two-way direct current signal to data collecting card.
In the present embodiment, described receiver comprises lock-in amplifier, described receiving transducer comprises receiving coil and low noise amplifier, and the test voltage signal sensed through described receiving coil and reference synchronization voltage signal are input to described data collecting card successively after described low noise amplifier and lock-in amplifier process.The test voltage signal sensed through described receiving coil and reference synchronization voltage signal are input to described data collecting card after described lock-in amplifier extraction process.
Please refer to Fig. 7, described lock-in amplifier comprises signalling channel, reference channel and two associated processing circuit, described test voltage signal inputs described pair of associated processing circuit through described signalling channel, described reference synchronization voltage signal inputs described pair of associated processing circuit through described reference channel, thus exports after the extraction process of described pair of associated processing circuit.
Described pair of associated processing circuit comprises homophase correlator and quadricorrelator, two input ends of described homophase correlator are connected to described reference channel and signalling channel respectively, two input ends of described quadricorrelator are connected to described reference channel and signalling channel respectively, described homophase correlator is connected in-phase component output port and quadrature component output port respectively with the output terminal of quadricorrelator, and described in-phase component output port is connected with described data collecting card with quadrature component output port.
Described homophase correlator and quadricorrelator include multiplier and the low-pass filter of series connection, two input ends of each described multiplier are connected to described reference channel and signalling channel respectively, the output terminal of two described multipliers connects one end of corresponding described low-pass filter respectively, the other end of the described low-pass filter in described homophase correlator connects described in-phase component output port, and the other end of the described low-pass filter in described quadricorrelator connects described quadrature component output port.
The other end of the described low-pass filter in described homophase correlator also connects a vector arithmetic unit; The other end of the described low-pass filter in described quadricorrelator also connects described vector arithmetic unit.
Described reference channel is provided with zero passage shaping circuit, harmonic circuit, fine tuning phase instrument and phase lock circuitry, and described reference synchronization voltage signal inputs described pair of associated processing circuit successively after zero passage shaping circuit, harmonic circuit, fine tuning phase instrument and phase lock circuitry.Reference signal from signal source is processed into the same frequency square wave that correlator requires by this design.Reference signal is shaped to and the pulse signal of reference signal with frequency through zero passage, delivers to harmonic circuit, according to measurement needs, produces corresponding harmonic wave.Deliver to the fine tuning phase-shifter that can produce 0-100 ° of phase shift, phase shift exports delivers to phase lock circuitry generation frequency multiplication and quadrature square wave formation circuit, produce the 1:1 dutycycle square wave of two-way phase differential 90 °, quadrature square wave forms the phase shift that circuit can produce 0 °, 90 °, 180 °, 270 °, adjustment in conjunction with prime 0-100 ° of phase-shifter can produce the phase shift of 0-360 °, meets lock-in amplifier to phase-adjusted needs.
Two-phase relevant treatment part is the core of lock-in amplifier, carries out relevant treatment to measured signal, realizes the signal detecting needs from noise or undesired signal background.Primarily of multiplier and low-pass filter composition, this unit contains two correlators, and a road is homophase correlator, and another road is quadricorrelator.Two output voltages are the in-phase component V of measured signal
xwith quadrature component V
y.
Due to the decay of PCCP pipe steel cylinder wall, the far-field eddy signal that receiving coil induces is extremely faint, the noise even electromagnetic interference noise in the external world that the noise of system itself, test platform shake are introduced all may than detection signal most orders of magnitude, useful signal may all be submerged among noise, and in the middle of very noisy, therefore how to extract required far-field eddy signal is the gordian technique that relation test platform normally works.
Lock-in amplifier is current the most frequently used Feeble signal detector device, its utilizes and measured signal has the reference signal of same frequency and phase relation as benchmark, only has response to the noise component of measured signal itself and those and reference signal together frequency (or frequency multiplication), homophase.Therefore, can significantly suppress useless noise, improve detection signal-to-noise ratio.Therefore the far-field eddy signal extraction technology adopting phase lock amplifying technology as native system is intended.
Described data collecting card, in order to:
Triggered by the pulse signal of an outside measuring wheel, gather the transmission after described receiver process and the signal that comes, and be uploaded to described main control computer; Specifically, under data acquisition is stuck in the control of data acquisition software on main control computer, by the pulse signal triggering collection process of measuring wheel, Real-time Collection is carried out to the two paths of signals that lock-in amplifier exports, and the data upload gathered to main control computer.
Described detection main frame also comprises power module and energy supply control module, please refer to Fig. 8, described energy supply control module comprises charger, detects resistance and battery monitor chip, described battery monitor chip is respectively with an accumulator with detect resistance and be connected, described charger is all connected with described accumulator with detection resistance, and described battery monitor chip is also connected with described main control computer by single-chip microcomputer.
The single Power convert that accumulator provides by power module exports the power supply of the various magnitudes of voltage for detecting main frame and main control computer needs.
In the present system, accumulator is the power supply of long period, is to ensure the stability of using electricity system, is a very important job to the monitoring of accumulator dump energy.The energy supply control module of the accumulator of native system design, between the negative pole and battery monitor chip of accumulator, seal in one detect resistance, can to information such as accumulator high precision, in real time on-line monitoring accumulator dump energy, current voltage, battery temperature, single-chip microcomputer can read the current state information of battery under the control of main control computer, upload to main control computer, carry out real-time online display by the data acquisition software of main control computer.
About detecting the interface of main frame, power interface is the power inlet of detection main frame, and accumulator gives detection host supplying power by power interface, and power interface also exports DC voltage is simultaneously that main control computer is powered; Launching output interface is the outlet that detection main frame transmits, and detection main frame is by this interface driver transmitting probe; Receive the input port that input interface is detection main frame Received signal strength, the signal of receiving transducer enters detection main frame by this interface and is received by receiver; Control interface is the passage that detection main frame and main control computer carry out the mutual and data transmission of signal, and main control computer is by the signal transmitting of this Interface Controller detection main frame and data acquisition.
Described main control computer, at least in order to:
The artificial input of response or foundation presupposed information control the running of described detection main frame automatically;
The artificial input of response or foundation presupposed information process the signal received from described detection main frame automatically;
Thus store and show testing result.
Main control computer runs PCCP data acquisition software, controls the operation of detection main frame, the data collected are stored.
Main control computer is intended adopting light industrial panel computer.Main control computer principal feature is as follows:
1. input with touch control manner, without the need to external access of mouse keyboard, be convenient to operate in PCCP pipeline environment;
2. screen intensity is adjustable, is adapted to different lightness environment;
3. low in energy consumption, be adapted to battery powered mode and work;
4. compact structure is compact, and external cable is few, is adapted at working in the industrial environment such as vibrations, humidity.
PCCP yarn break inspect instrument software runs in main control computer, mainly realizes the functions such as System self-test, Data acquisition and storage, system running state monitoring.
PCCP yarn break inspect software automatically runs after main control computer start, start immediately to carry out self-inspection to all parts of instrument, if any parts have fault, then not by self-inspection, data acquisition software will generate a Trouble Report, point out equipment failure position, then stop the operation of program.
If each component working of instrument is normal, then self-inspection is passed through, software enters data acquisition starting point selection mode, now by the data collected, software judges whether instrument is in the interface position in 2-section pipe road, if, then alert is named data acquisition starting point, names complete, and the starting point of data acquisition is determined to enter data acquisition flow.
In data acquisition flow, data acquisition software stores the pipeline data along the line that detection main frame collects, and shows instrument running status---and instrument advances real-time speed, the in real time video image of mileage number, the real-time battery electric quantity of instrument and instrument advance route road conditions to be presented at all in real time on the main interface of software.In the process of data acquisition, if the excessive velocities that instrument advances, data acquisition software can give the alarm, and notifies that operating personnel reduce pace in time.
When operating personnel click end collection button, the automatic end data collection in a pipe joint place that instrument can be nearest in front, data acquisition flow terminates.
In summary, when system of the present invention is carried out at a slow speed in PCCP pipeline, signal source produces the sinusoidal signal of fixed frequency and amplitude by the parameter that control treatment software is preset, sinusoidal signal produces the low frequency magnetic field of alternation after low-frequency power amplifier amplifies by transmitting coil, PCCP tube wall induces the eddy current signal that can penetrate tube wall, this eddy current signal is propagated along the compressor wire outside outer tube wall and tube wall, again penetrate tube wall at the opposite side of tube wall and enter in PCCP pipeline, signal source also exports the lock-in amplifier of synchronous reference signal to receiving element as the input of reference signal simultaneously.
The far-field eddy signal penetrating tube wall can induce faint voltage signal in receiving coil, this voltage signal sends lock-in amplifier to after low noise amplifier amplifies, lock-in amplifier carries out filtering purification to this voltage signal again according to the frequency of reference signal and phase place, further amplification, through data collecting card collection.
Measuring wheel is carried out with test platform and rolls, and produce a series of pulse signal, trigger data acquisition card gathers the signal that lock-in amplifier sends.The data upload that data collecting card collects, to computing machine, is undertaken storing and showing by computing machine.The pulse signal simultaneously produced according to measuring wheel can calculate the more specific location information of current test platform.
When fracture of wire appears in PCCP, the distortion in amplitude and phase place can be produced the far-field eddy signal penetrating tube wall for twice, utilize this phenomenon, just can realize judging the radical of PCCP fracture of wire and circuit wire position.
In sum, the present invention considers energy that transmitting probe and receiving transducer direct-coupling the come energy much larger than far-field eddy signal under the limited condition of equipment size.By the setting of blanking disc, can decay or block between transmitting probe and receiving transducer, the direct-coupling path namely between drive coil and receiving coil, outstanding far-field eddy information, makes far field distance be less than 2-3 times of caliber.In addition, present invention further introduces measuring wheel, the collection of data and the change in location of system are connected, thus makes Detection results better.
Claims (10)
1. a PCCP steel wire yarn break inspect system, comprise main control computer, detection main frame, receiving transducer, transmitting probe, car body and measuring wheel, described main control computer, detection main frame, receiving transducer, transmitting probe and measuring wheel to be all located on described car body and together to advance with described car body, and described receiving transducer, transmitting probe and measuring wheel, main control computer are all connected with described detection main frame;
Described transmitting probe comprises transmitting coil and blanking disc, described transmitting coil is located in described blanking disc, described transmitting coil, at least in order to respond the AC signal of described detection main frame input, launch corresponding electromagnetic wave signal, thus induce eddy current signal on PCCP tube wall; The direct-coupling signal of described blanking disc at least for decaying between described transmitting coil and receiving transducer; Described AC signal includes the test AC signal and reference synchronization AC signal that match each other;
Described receiving transducer, at least in order to respond described eddy current signal, thus induces the voltage signal corresponding with described AC signal, and transfers to described detection main frame; Described voltage signal comprises the test voltage signal corresponding with described test AC signal and the reference synchronization voltage signal corresponding with described reference synchronization AC signal;
Described detection main frame, at least in order to:
Generate described AC signal, and export described transmitting probe and main control computer to;
The pulse signal exported by described measuring wheel triggers, and gathers treated described reference synchronization voltage signal and described test voltage signal;
Described main control computer is uploaded to by after treated described reference synchronization voltage signal and described test voltage signal transacting;
Described main control computer, at least in order to:
The artificial input of response or foundation presupposed information control the running of described detection main frame automatically;
The artificial input of response or foundation presupposed information process the signal received from described detection main frame automatically;
Thus store and show testing result;
Described measuring wheel, in order to generate described pulse signal according to the change in location of advancing.
2. PCCP steel wire yarn break inspect system as claimed in claim 1, is characterized in that: described blanking disc is double-layer shielding structure, comprises one deck copper sheet layer and one deck iron sheet layer.
3. PCCP steel wire yarn break inspect system as claimed in claim 1, is characterized in that: described transmitting probe is installed on described car body by a length-adjustable probe support arm.
4. PCCP steel wire yarn break inspect system as claimed in claim 3, it is characterized in that: described sway brace is fixed on described car body, make described receiving transducer and transmitting probe along PCCP caliber to arrangement, and making described receiving transducer be positioned at top inside PCCP pipe further, transmitting probe is positioned at the bottom inside PCCP pipe.
5. PCCP steel wire yarn break inspect system as claimed in claim 1, it is characterized in that: described detection main frame at least comprises transmitter, receiver and data collecting card, described transmitter is connected with described transmitting probe, described receiver is connected with described receiving transducer, described data collecting card is connected with described receiver and main control computer respectively, and described transmitter is also connected with described main control computer.
6. PCCP steel wire yarn break inspect system as claimed in claim 5, it is characterized in that: described transmitter comprises signal source and power amplifier, described signal source is in order to produce described AC signal; Described reference synchronization AC signal and the test AC signal after amplifying in order to carry out power amplification to described alternating-current measurement stream signal, and are transferred to described transmitting probe by described power amplifier, make it the transmitting realizing electromagnetic wave signal.
7. PCCP steel wire yarn break inspect system as claimed in claim 6, it is characterized in that: described signal source comprises low-power scm, DDS chip, low-pass filter and phase inverter, described low-power scm, DDS chip, low-pass filter are connected successively with power amplifier, thus export described test AC signal by described power amplifier; Described low-power scm, DDS chip are connected successively with phase inverter, thus export reference synchronization AC signal by described phase inverter.
8. PCCP steel wire yarn break inspect system as claimed in claim 6, it is characterized in that: described power amplifier comprises pre-amplification circuit, power amplification circuit and stabilized voltage supply, described AC signal realizes amplifying through described pre-amplification circuit and power amplification circuit successively, thus exported by described power amplification circuit, described stabilized voltage supply is connected with described pre-amplification circuit and power amplification circuit respectively.
9. PCCP steel wire yarn break inspect system as claimed in claim 5, it is characterized in that: described receiver comprises lock-in amplifier, described receiving transducer comprises receiving coil and low noise amplifier, and the test voltage signal sensed through described receiving coil and reference synchronization voltage signal are input to described data collecting card successively after described low noise amplifier and lock-in amplifier process.
10. PCCP steel wire yarn break inspect system as claimed in claim 5, it is characterized in that: described detection main frame also comprises energy supply control module, described power module comprises charger, detects resistance and battery monitor chip, described battery monitor chip is respectively with an accumulator with detect resistance and be connected, described charger is all connected with described accumulator with detection resistance, and described battery monitor chip is also connected with described main control computer by single-chip microcomputer.
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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 |
| CN108957566A (en) * | 2018-04-13 | 2018-12-07 | 荆门品创通信科技有限公司 | A kind of sealing detector of highly sensitive high anti-interference pipe and cable detector |
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