CN102798660B - Based on inner and outer walls of pipeline defect detecting device and the method for three axle leakage fields and current vortex - Google Patents
Based on inner and outer walls of pipeline defect detecting device and the method for three axle leakage fields and current vortex Download PDFInfo
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Abstract
Based on inner and outer walls of pipeline defect detecting device and the method for three axle leakage fields and current vortex, belong to technical field of nondestructive testing.Comprise flux leakage detector, data processing and storer, power supply and at least three mileages to take turns, in addition, also comprise vortex sensor, described vortex sensor is made up of eddy current sensor, for the device of testing pipes surfaces externally and internally defect.Apparatus of the present invention are the different qualities utilizing Magnetic Flux Leakage Inspecting and eddy current detection, are got up by two kinds of methods combining, thus realize the function distinguishing inside and outside wall defect.In addition, the method Detection job that the present invention proposes is good, easy to operate, can be widely used in the Non-Destructive Testing of the oil pipeline of the industrial circle such as oil, petrochemical industry.
Description
Technical field
The invention belongs to technical field of nondestructive testing, particularly a kind of inner and outer walls of pipeline defect detecting device based on three axle leakage fields and current vortex and method.
Background technology
Flux-leakage detection method is the Dynamic Non-Destruction Measurement that automaticity is higher, be widely used in ferrimagnet quality testing and safety monitoring, effects on surface defect recognition has extraordinary Detection results, but, very micro-to the Division identification effect of inside and outside defect, eddy current detection method is also one of conventional Dynamic Non-Destruction Measurement, and utilization eddy current principle is obvious near surface flaw recognition effect.Above two kinds of methods respectively have relative merits, all can not the surfaces externally and internally defect Division identification of independent complete twin conduit.
Summary of the invention
For the defect that prior art exists, the object of the invention is to propose a kind of inner and outer walls of pipeline defect detecting device based on three axle leakage fields and current vortex and method, the technology adopting Magnetic Flux Leakage Inspecting to combine with eddy current detection, reaches the object simultaneously detecting inside and outside wall defect.
Technical scheme of the present invention is achieved in that a kind of inner and outer walls of pipeline defect detecting device based on three axle leakage fields and current vortex, comprise flux leakage detector, data processing and storer, power supply and at least three mileages to take turns, in addition, also comprise vortex sensor, described vortex sensor is made up of eddy current sensor, described flux leakage detector and vortex sensor lay respectively at data processing and storer both sides, distance is between the two at least 0.5m, and both are connected with storer with data processing simultaneously.
Described vortex sensor is a kind of device for testing pipes surface imperfection, and this device is in closed condition always, and only have when flux leakage detector detects abnormal signal, vortex sensor is just opened.
Described eddy current sensor is at least 50 groups.
Described data processing and storer, comprise signal conditioning circuit, A/D converter, controller and storer; Wherein, described signal conditioning circuit is for the sensor in flux leakage detector be positioned at that the signal that vortex sensor flow sensor collects amplifies, the device of filtering; Described controller, for the power on/off of controlled vortex flow detecting device, control signal modulate circuit is nursed one's health signal, control A/D device realizes A/D conversion and control store data storage operations.
Described mileage wheel, for the displacement information of pen recorder in pipeline.
Described power supply, for powering for all live components.
Adopt the inner and outer walls of pipeline defect detecting device based on three axle leakage fields and current vortex to carry out the method for inner and outer walls of pipeline defects detection, comprise the following steps:
Step 1: when the medium of flowing promotes to move in pipeline based on the inner and outer walls of pipeline defect detecting device of three axle leakage fields and current vortex, take turns the displacement signal gathering said apparatus, the magnetic flux leakage data being gathered pipe surface by flux leakage detector by mileage, the signal collected feeding data processing and storer are processed;
Step 2: setting dynamic threshold δ
i, formula is as follows:
In formula, wherein i is as marker character, and value is positive integer, and initial value is 0; N is the total number of data gathered, and its value is at least 100; λ
ifor the magnetic flux leakage data gathered in 5m before device present position, λ
jfor the jth magnetic flux leakage data value collected,
for the magnetic flux leakage data mean value collected;
Step 3: if the magnetic flux leakage data value gathered is greater than the dynamic threshold δ of setting
i, then prove that flux leakage detector is to defect abnormal signal, now, open eddy current sensor by the controller in data processing and storer, to the detection of pipe surface, utilize the skin effect of eddy current detection, under control of the controller, by the detection signal of inner surface of pipeline, be stored in storer;
Step 4: if the magnetic flux leakage data value gathered is less than the dynamic threshold δ of setting
i, then prove abnormal signal not detected, now Regeneration dynamics threshold value is δ
i+1, now start to record mileage and take turns the shift value S crossed
1, when mileage wheel crosses shift value S
1time equal with the distance in device between flux leakage detector and vortex sensor, close vortex sensor by controller, stop the detection to pipe surface;
Step 5: step 1 and step 3 to be detected and the signal stored imports host computer into, leakage field sensor detects whether defect of pipeline detected to utilize the defects detection software being positioned at host computer to judge, if do not exist, then continues judgement; If exist, then whether current vortex sensor detects defect to utilize software to judge, if current vortex sensor detects defect, then this defect is inner surface of pipeline defect, otherwise is pipeline external surface defect.
Beneficial effect of the present invention: the inner and outer walls of pipeline defect detecting device based on three axle leakage fields and current vortex that the present invention proposes is the different qualities utilizing Magnetic Flux Leakage Inspecting and eddy current detection, two kinds of methods combining are got up, thus realizes the function distinguishing inside and outside wall defect.In addition, to the control of vortex sensor, realized by controller, the signal arrived using Magnetic Flux Leakage Inspecting, as foundation, controls the power on/off of vortex sensor, when only having Magnetic Flux Leakage Inspecting to arrive abnormal signal, just opens EDDY CURRENT joint, reaches the object of saving electric energy.In addition, the method Detection job that the present invention proposes is good, easy to operate, can be widely used in the Non-Destructive Testing of the oil pipeline of the industrial circle such as oil, petrochemical industry.
Accompanying drawing explanation
Fig. 1 is one embodiment of the present invention based on the structured flowchart of the inner and outer walls of pipeline defect detecting device of three axle leakage fields and current vortex;
Fig. 2 is one embodiment of the present invention flux leakage detector structural representation;
Fig. 3 is one embodiment of the present invention data processing and memory construction schematic diagram;
Fig. 4 is one embodiment of the present invention signal conditioning circuit schematic diagram;
Fig. 5 is one embodiment of the present invention controller circuitry schematic diagram;
Fig. 6 is one embodiment of the present invention inside and outside wall defects detection process flow diagram;
Fig. 7 is that one embodiment of the present invention host computer is to defect recognition process flow diagram.
Embodiment
Below in conjunction with accompanying drawing, working of an invention mode is described further.
The inner and outer walls of pipeline defect detecting device based on three axle leakage fields and current vortex that present embodiment adopts, its structure as shown in Figure 1.Comprise at least three mileage wheel 1-1, flux leakage detector 1-2, vortex sensor 1-3, data processing and storer 1-4 and power supply 1-5.Above-mentioned device can be encapsulated in structure as shown in Figure 1, and wherein, data processing and storer 1-4 are positioned at the center of this encapsulating housing, the balance of assurance device and core component security; Flux leakage detector 1-2 is positioned at the left side of data processing and storer 1-4, vortex sensor 1-3 is positioned at the right side of data processing and storer 1-4, and the distance between flux leakage detector 1-2 and vortex sensor 1-3 is at least 0.5m, the magnetic field that both guarantees are formed does not produce and influences each other.
Wherein, flux leakage detector 1-2 is made up of three axle leakage field sensings of at least 50 groups, and vortex sensor 1-3 is made up of at least 50 group eddy current sensors, and both are connected with storer 1-4 with data processing simultaneously.
Flux leakage detector 1-2 as shown in Figure 2.Adopt by 150 three axle Hall elements (band probe 2-1) in present embodiment, permanent magnet 2-2, steel brush 2-3 and yoke 2-4 forms, wherein three axle Hall elements are three orthogonal Hall elements of axis, permanent magnet 2-2 is adsorbed on yoke 2-4, steel brush 2-3 is provided with above permanent magnet 2-2, permanent magnet 2-2 is attracting across steel brush 2-3 and inner-walls of duct 2-5, in present embodiment, adopt 2 groups of permanent magnets staggered relatively and steel brush, the cavity formed with yoke 2-4 and inner-walls of duct 2-5, three axle Hall element probe 2-1 are provided with in this cavity, this probe 2-1 is near inner-walls of duct 2-5, and keep a lift-off value 2mm with it, this probe is to pipeline axial, magnetic flux data that are radial and circumference are measured.Three axle Hall element hoops are distributed in inner-walls of duct 2-5, wall defects 2-6 are detected, and detection signal is exported to data processing and storer 1-4.
Vortex sensor 1-3 is a kind of device for testing pipes surface imperfection, this device is generally in closed condition, only have when flux leakage detector detects abnormal signal, vortex sensor 1-3 is just unlocked, after detection completes, can close under the control of data processing and storer 1-4 again, reach the object of saving electric energy.
Data processing and storer 1-4, as shown in Figure 3, by signal conditioning circuit, filtering circuit, multi-way switch group, A/D converter, controller (adopting fpga logic circuit in present embodiment) and storer, (present embodiment comprises 2 storeies, one is the inner buffer of FPGA, and another is independent storage chip); Wherein, signal conditioning circuit be for the sensor in flux leakage detector and be arranged in that vortex sensor flow sensor collects signal amplifies, (present embodiment have employed independent filtering circuit to carry out filtering in filtering, the better effects if of such filtering) device, as shown in Figure 4, by the signal condition filtering circuit group be made up of INA326, carry out the amplification of signal, filtering, make signal bandwidth be limited in the scope of needs, the amplitude of signal and the range of ADC are matched; After above-mentioned process, controller FPGA controls the input of multi-way switch gating signal, and then signal is admitted to sampling holder and samples, and is then quantized by analog to digital converter; Digital data after conversion is admitted to storage chip to carry out storing the process for follow-up.
Controller exports 4 class control signals: wherein a class signal is used for the power on/off of controlled vortex flow detecting device 1-3, one class signal is used for control signal modulate circuit to the conditioning process of signal, one class signal is for controlling A/D converter, A/D conversion is carried out to the data collected, one class signal is used for control store, the storage of control signal, as shown in Figure 5, the controller FPGA in present embodiment mainly complete the switch of current vortex sensor, the gating of multi-way switch group, AD7656 startup conversion, export and the memory function of data.In 5 multi-way switch groups, the channel selecting signal of multi-way switch is connected together by A0-A2 order, and then FPGA allows multi-way switch start by IO_EN Enable Pin simultaneously, and carries out gating by IO_A0-A2 to the Multiplexer Channel of 5 multi-way switch groups.Each multi-way switch group is made up of the DG406 analog switch of 3 16 passages.The analog quantity parallel output detected from leakage field sensor and eddy current sensor gathers to the AD7656 of 6 passages.FPGA provides enabling signal respectively by IO_CONA/B/C to 5 AD7656, and sends BUSY, CS, RD and RESET signal and carry out reading and writing data to AD7656 and reset etc.FPGA is also by control that IO_Edyy_EN input and output I/O port is opened current vortex sensor, closed.
System (needs time slot because of between each image data after set time delay, not so there will be overlap to allow last data gather thoroughly in other words to finish, just start data acquisition next time), start 15 DG406 multi-way switchs by IO_EN signal simultaneously.Whole system just can to the synchronous acquisition of 30 simulating signals.FPGA is by software mode afterwards, to the register write control word of four AD7656, selects the mode of operation that AD is synchronous; Then the phaselocked loop of FPGA inside carries out frequency multiplication to input clock, the clock after frequency multiplication is delivered to outside phaselocked loop, and outside phaselocked loop produces the sampling clock of AD converter, and AD7656 just starts to change simulating signal, finally the data of conversion is stored.This data acquisition system (DAS) can be operated in 2 kinds of patterns: external trigger pattern and internal trigger pattern.External trigger mode operation regimes is adopted in present embodiment, first main frame sends reset enable signal whole system and resets, system is in a state prepared thus, wait for the arrival of external trigger pulse, external trigger signal starts AD converter image data when arriving, then data are stored, and go sense data by host computer.
Power supply 1-5 at flux leakage detector 1-2 and between data processing and storer 1-4, for powering for all live components.
At least comprise three mileage wheel 1-1 in present embodiment, mileage wheel 1-1 is positioned at device tail end, for the displacement information of pen recorder in pipeline, enters to have supporting role to device at pipeline internal simultaneously.
Wherein, to the control of EDDY CURRENT joint, can cross controller and realize, the signal arrived using Magnetic Flux Leakage Inspecting, as foundation, controls the power on/off of EDDY CURRENT joint, when only having Magnetic Flux Leakage Inspecting to arrive abnormal signal, just opens EDDY CURRENT and saves, saving electric energy.
In addition, what adopt in present embodiment is also provided with leather cup 1-6 based on two ends outside the inner and outer walls of pipeline defect detecting device of three axle leakage fields and current vortex, moves, play a driving role to device in pipeline.
Adopt the inner and outer walls of pipeline defect detecting device based on three axle leakage fields and current vortex to carry out the method for inner and outer walls of pipeline defects detection in present embodiment, as shown in Figure 6, this flow process starts from step 601.In step 602, when the medium of flowing promotes to move in pipeline based on the inner and outer walls of pipeline defect detecting device of three axle leakage fields and current vortex, the displacement signal gathering said apparatus, the magnetic flux leakage data being gathered pipe surface by flux leakage detector is taken turns by mileage, the signal collected feeding data processing and storer are processed, wherein, the data that mileage wheel and flux leakage detector gather are the data within this device 5m.
In step 603, setting dynamic threshold δ
i, formula is as follows:
In formula, n value is the total number of data gathered in 5m before device present position, and its value is at least 100; λ
jfor the jth magnetic flux leakage data value gathered in 5m before device present position,
for the magnetic flux leakage data mean value gathered in 5m before device present position, can reduce the uneven interference to threshold value of pipeline thus, it is more accurate to make magnetic flux leakage data defect dipoles.
In step 604, if the magnetic flux leakage data value gathered is greater than the dynamic threshold δ of setting
i, then prove that flux leakage detector is to defect abnormal signal, now, open eddy current sensor by the controller in data processing and storer, to the detection of pipe surface, utilize the skin effect of eddy current detection, under control of the controller, by the detection signal of inner surface of pipeline, be stored in storer;
In step 605, if the magnetic flux leakage data value gathered is less than the dynamic threshold δ of setting
i, then prove abnormal signal not detected, now Regeneration dynamics threshold value is δ
i+1, now start to record mileage and take turns the shift value S crossed
1, when mileage wheel crosses shift value S
1time equal with the distance in device between flux leakage detector and vortex sensor, close vortex sensor by controller, stop the detection to pipe surface;
In step 606, step 1 and step 3 to be detected and the signal stored imports host computer into, utilize the defects detection software (present embodiment adopts neuinsoft) being positioned at host computer to judge leakage field sensor detects whether defect of pipeline detected, if do not exist, then continue to judge; If exist, then whether current vortex sensor detects defect to utilize software to judge, if current vortex sensor detects defect, then this defect is inner surface of pipeline defect, otherwise is pipeline external surface defect, as shown in Figure 7.
Although the foregoing describe the specific embodiment of the present invention, one skilled in the art should be appreciated that these only illustrate, can make various changes or modifications, and do not deviate from principle of the present invention and essence to these embodiments.Scope of the present invention is only defined by the appended claims.
Claims (1)
1. the inner and outer walls of pipeline defect inspection method based on three axle leakage fields and current vortex, the inner and outer walls of pipeline defect detecting device based on three axle leakage fields and current vortex is adopted to realize, this device comprises flux leakage detector, data processing and storer, power supply and at least three mileages takes turns, also comprise vortex sensor, described vortex sensor is made up of eddy current sensor, described flux leakage detector and vortex sensor lay respectively at data processing and storer both sides, distance is between the two at least 0.5m, and is both connected with storer with data processing; Described vortex sensor is a kind of device for testing pipes surface imperfection, and this device is in closed condition, and only have when flux leakage detector detects abnormal signal, vortex sensor is just opened; Described eddy current sensor is at least 50 groups; Described data processing and storer, comprise signal conditioning circuit, A/D converter, controller and storer; Wherein, described signal conditioning circuit is for the sensor in flux leakage detector be positioned at that the signal that vortex sensor eddy current sensor collects amplifies, the device of filtering; Described controller, nurses one's health signal for the power on/off of controlled vortex flow detecting device, control signal modulate circuit, controls the data storage operations that A/D converter realizes A/D conversion and control store; Described mileage wheel, for the displacement information of pen recorder in pipeline;
It is characterized in that: comprise the following steps:
Step 1: when the medium of flowing promotes to move in pipeline based on the inner and outer walls of pipeline defect detecting device of three axle leakage fields and current vortex, take turns the displacement signal gathering said apparatus, the magnetic flux leakage data being gathered pipe surface by flux leakage detector by mileage, the signal collected feeding data processing and storer are processed;
Step 2: setting dynamic threshold δ
i, formula is as follows:
In formula, wherein i is as marker character, and value is positive integer, and initial value is 0; N is the total number of data gathered, and its value is at least 100; λ
ifor the magnetic flux leakage data gathered in 5m before device present position, λ
jfor the jth magnetic flux leakage data value collected,
for the magnetic flux leakage data mean value collected;
Step 3: if the magnetic flux leakage data value gathered is greater than the dynamic threshold δ of setting
ithen prove that flux leakage detector detects defect abnormal signal, now, the detection of eddy current sensor to pipe surface is opened by the controller in data processing and storer, utilize the skin effect of eddy current detection, under control of the controller, by the detection signal of inner surface of pipeline, be stored in storer;
Step 4: if the magnetic flux leakage data value gathered is less than or equal to the dynamic threshold δ of setting
i, then prove abnormal signal not detected, now Regeneration dynamics threshold value is δ
i+1, now start to record mileage and take turns the shift value S crossed
1, when mileage wheel crosses shift value S
1time equal with the distance in device between flux leakage detector and vortex sensor, close vortex sensor by controller, stop the detection to pipe surface;
Step 5: step 1 and step 3 to be detected and the signal stored imports host computer into, flux leakage detector detects whether defect of pipeline detected to utilize the defects detection software being positioned at host computer to judge, if do not exist, then continues judgement; If exist, then whether eddy current sensor detects defect to utilize software to judge, if eddy current sensor detects defect, then this defect is inner surface of pipeline defect, otherwise is pipeline external surface defect.
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