CN203838350U - Device for detection of corrosion of buried pipe through audio frequency guided wave - Google Patents
Device for detection of corrosion of buried pipe through audio frequency guided wave Download PDFInfo
- Publication number
- CN203838350U CN203838350U CN201420081002.3U CN201420081002U CN203838350U CN 203838350 U CN203838350 U CN 203838350U CN 201420081002 U CN201420081002 U CN 201420081002U CN 203838350 U CN203838350 U CN 203838350U
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Abstract
Provided is a device for detection of transmitter transmitter corrosion of a buried pipe through an audio frequency guided wave. The device comprises an emitter and a receiver which works in cooperation with the emitter. The emitter comprises an emission power supply module, an emission control module and an inversion emission module connected with the emission control module. The emission control module comprises an emission control circuit, a first acquisition circuit, a first keyboard circuit, a display circuit, and an amplification circuit connected with the emission control circuit. The inversion emission module comprises an emission oscillation circuit, a driving circuit and a transformation isolation circuit connected in order. The receiver comprises a reception power supply module and a reception control module. The reception control module comprises a reception control circuit, a second acquisition circuit, a filtering amplification circuit, a second keyboard circuit, a second display circuit used for display after receiving an display instruction outputted by the reception control circuit, and a sound alarm circuit connected with the reception control circuit through a voltage frequency converting circuit. The device has advantages of simple operation, convenient, rapid and accurate detection and low cost.
Description
Technical field
The utility model belongs to field of non destructive testing, relates to the device that a kind of audio frequency guided wave detects corrosive pipeline.
Background technology
Utilize the methods such as ultrasonic, ray, magnetic, infiltration, scanning imagery to detect pipeline fault, determine that hidden danger abort situation can only be before pipeline buries soil.When pipeline be embedded in underground after, be subject to blocking, cover, shielding of the objects such as earth, sandstone, cement and asphalt road surface, earth's surface construction of structures, breaking down can not be as the direct contact detection of the detection method with surface duct, but has certain disguise.
Utilize flux leakage detector to carry out interior detection to pipeline, need to stop production a period of time, cut open pipeline, cleaning sludge on inner wall of pipeline, put in-pipeline detector into, before and after utilizing pumped (conveying) medium, pressure reduction drives internal detector to move ahead, this method need to be transformed and be not suitable with the threeway that internal detector moves ahead, elbow, radius-of-curvature, pipeline reducing diameter, affiliated facility on valve opening degree etc. and pipeline, costliness because of checkout equipment and testing cost, every instrument is only suitable for a kind of pipeline of specification, stop production to detect and lose the reasons such as huge, this technology could be applied on minority long-distance transport pipes at home.
Utilize pipe robot in the inner-walls of duct analysis of making a video recording, need equally to stop production, pipeline is transformed, be only only applicable to the gas pipe line that cleanliness are higher.
The corrosion of ultrasonic guided wave detecting inner and outer walls of pipeline, also because disposable detection distance is limited, just needs chosen position excavation test pit every tens meters, so that probe contact pipeline transmitting guided wave signals, due to instrument price, testing cost is high, the reasons such as detection speed is slow, are difficult to generally promote on pipeline.
Summary of the invention
Goal of the invention of the present utility model is to overcome the above-mentioned deficiency of prior art and a kind of device that simple and easy, easy to detect, quick, accurate, cost is low audio frequency guided wave detects Buried Pipeline that operates is provided.
The technical solution of the utility model is: comprise transmitter and with the receiver of transmitter cooperating;
Described transmitter comprises emission power module, emission control module, the inversion transmitter module being connected with emission control module;
Described emission control module comprises countdown circuit, for gathering the Acquisition Circuit one of launching electric signal and being sent to countdown circuit, for sending idsplay order to the keyboard circuit one of countdown circuit, for receiving the display circuit one showing after the idsplay order of countdown circuit output, the amplifying circuit being connected with countdown circuit;
Described inversion transmitter module comprises and being connected successively for the transmitting oscillatory circuit that converts the electrical signal to audio oscillator signal, driving circuit, the transformation buffer circuit amplifying for the audio oscillator signal that transmitting oscillatory circuit is sent; The oscillatory circuit of inversion transmitter module is amplified into inversion buffer circuit through overdrive circuit (gate circuit); This circuit one end is connected with base plate relay circuit, and the other end is connected with common ground end; Two lines are all received rear panel socket, by two output lines of rear panel plug wherein one receive pipeline, another root connects the earth.Form single line
-ground return circuit.By transmitting oscillatory circuit, make the inner direct current voltage transitions of transmitter become the audio oscillator signal of design, by driving circuit, make audio oscillator signal be amplified to the sensed signal sources of mating with pipeline field impedance phase.By transformation buffer circuit and circuit common ground end, power cathode, fuselage touchdown, be extremely connected and realize the personal safety that detects operating personnel when 220V charging is adjusted to higher-wattage with transmitter.
Described receiver comprises reception power module, receives control module;
Described reception control module comprises reception control circuit, be used for the Acquisition Circuit two that gathers the electric signal of pipe under test and be sent to reception control circuit, the filter amplification circuit of the electric signal gathering for the treatment of Acquisition Circuit two, for sending idsplay order to the keyboard circuit two of reception control circuit, for receiving the display circuit two showing after the idsplay order of reception control circuit output, the audible alarm circuit being connected with reception control circuit through voltage-frequency conversion circuit.Signal after filtering circuit, the remaining useful signal consistent with transmission frequency, now, on the pipeline of range transmission machine number kilometer, square signal is very faint, through amplifying circuit, after bandpass filtering, instrument receiver can have been known and distinguish; After voltage-frequency conversion circuit, by the different switching of voltage signal, become the difference of sound vibration frequency: low frequency buzz, intermediate frequency steam whistle sound, high frequency air defense alarm sound.
Described every transmitter is joined two receivers.Two receivers are inner all the same with external control keyboard, display panel; Incoming line by grafting pop one's head in from leak detection line different realize pipelines with location leak source difference in functionalitys.Two receivers are respectively pipe locator receiver, detector receiver, and one before two receivers receives machine transplanting of rice probe detection pipeline location without connection; Below one receives machine transplanting of rice leak detection line detection and location pipeline anticorrosion coating breaking point through two testing staff's of leak detection line connection hand, keeps spacing, at pipeline fault place, just has step voltage.During the testing of pipe locator receiver, by the direction left-right rotation of probe (antenna), can send different acoustic, numeral, the cursor signal in gap; Detector receiver no signal during pipeline non-fault when testing, when pipeline has fault, just have sound equipment, numeral, cursor alerting signal, two receiver demonstration data are not both by grafting pops one's head in from the different of leak detection line and regulates upper and lower key different sensitivity to realize.
Described emission power module comprises battery one (accumulator), be used to the charging circuit, power converting circuit one of battery one charging, the mu balanced circuit being connected with power converting circuit one.Charging circuit becomes the alternating current of 220V in the direct current of 20V, and power converting circuit is transformed into the direct current of 20V in the direct current of 12V.After mu balanced circuit, can meet the voltage request that audio oscillation is launched each functional module.Charging circuit is used to battery one charging, and there is charging circuit transmitter inside.When battery feed is sufficient, by direct supply accumulator, to transmitter, powered; During battery feed short of electricity, transmitter rear panel inserts 220V power lead, by the backward power source charges of transmitter internal wiring transformation.
Described reception power module comprises battery two (accumulator), is used to charger, the power converting circuit two of accumulator two chargings.Charger is used to accumulator two chargings, and receiver inside is without charging circuit, and receiver charging is to be charged by external charger.
Transmitter feature and principle of work
1. because this instrument is for field work, therefore, during daytime field work, this instrument is battery-powered; Charged to battery by transmitter charge inside circuit evening, automatically stops charging when battery is full of.
2. due to this instrument, there is the functions such as power, voltage, electric current, the various parameter displays of resistance, band selection, so control module must detect corresponding various parameter, then calculate and show; Meanwhile, according to on-the-spot different situations, utilize keyboard to select flexibly different output parameters.
3. because this instrument is direct current supply, and Site Detection needs, be to exchange, therefore, must utilize inversion unit that direct current is become to interchange; Meanwhile, also must there is certain output power, so, in inversion unit, use large power triode to drive, thereby meet on-the-spot remote must asking of detecting.
Receiver principle
1,, because this instrument is for field work, therefore, during daytime field work, this instrument is powered by internal cell; Charged to internal cell by charger evening, automatically stops charging when battery is full of, and pilot lamp is green by red stain.
2,, because this instrument has numeral, cursor, the various parameter displays of sound equipment, the functions such as the strong and weak selection of signal, so control module must detect corresponding various parameter, then calculate and show; Meanwhile, according to on-the-spot different situations, utilize keyboard to select flexibly signal intensity and various parameter thereof.
3,, because scene reception signal is very weak, therefore, the signal of reception need to be carried out to filtering, amplification, voltage-frequency conversion, audible alarm, thereby meet the demand of on-the-spot remote detection.
4, Redundancy Design: pipe locator receiver and detector receiver, two receivers have versatility interchangeability, and plug is plugged probe detection pipeline, and plug is plugged leak detection line and is detected leakage.While detecting on newly-built pipeline and the clearly old pipeline of location comparison, be all used for detecting pipeline anticorrosion coating trouble spot, increase work efficiency to 200%.
Detect the ultimate principle of judgement corrosive pipeline: corrosive pipeline causes that the conductance of pipeline, magnetoconductivity decline, resistivity rises, resistance is the parameter of block current flow transmission, and resistance can make the electric flux transmitting on pipeline become thermal energy, thereby causes that electromagnetic field attenuation is abnormal; The detection signal electric current loading has current wave, voltage wave reflection, refraction and transmission at corrosive pipeline interface, the electromagnetic wave opposite direction of reflection, has offset field signal, thereby causes that magnetic field is abnormal; Unsymmetrical corrosion, equivalent current center skew on pipeline, pipe locator just can detect on earth's surface; Pipeline outer wall corrosion all occurs in anticorrosive coat damage location, and marking current forms spherical potential fields herein, step voltage detected; At corrosive pipeline place, the marking current of loading can form current vortex field near position, corrosive pipeline hole, and the dextrorotation magnetic line of force direction that on pipeline, line current produces has been upset in this vortex field, with instrument earth's surface outside pipeline, all can detect.
Major function of the present utility model is: pipelines position, trend, the degree of depth (degree of depth can reach 30 meters), location steel piping insulation anticorrosive coat breaking point, differentiation breaking point size, the inside and outside wall erosion point of pipelines, assessment pipeline anticorrosion coating insulation resistance grade.Survey nonmetal pipeline tracing line and cable, the position of optical cable, trend, the degree of depth, trouble spot.
Accompanying drawing explanation
Fig. 1 is schematic block circuit diagram of the present utility model.
Fig. 2 is the schematic block circuit diagram of transmitter.
Fig. 3 is first's circuit diagram of transmitter.
Fig. 4 is the second portion circuit diagram of transmitter.
Fig. 5 is the schematic block circuit diagram of receiver.
Fig. 6 is first's circuit diagram of receiver.
Fig. 7 is the second portion circuit diagram of receiver.
Fig. 8 is use constitutional diagram of the present utility model.
Embodiment
In Fig. 1, every transmitter 21 is joined two receivers 22.Two receivers are respectively pipe locator receiver, detector receiver.Pipe locator receiver is connected with probe, field signal on receiving pipeline.Magnetic field is by near airborne acquisition comparison earth's surface above pipeline of popping one's head in, and detector receiver is connected with leak detection line, the displacement current signal of recipient's body capacitance induction.The adjusting of receiver signal is by the upper and lower arrow membrane keyboard of panel, to control inner amplifying circuit the data when regulating are presented in LCD screen through signal acquisition circuit, A/D change-over circuit.Two receivers are inner all the same with external control keyboard, display panel, the different difference in functionalitys of realizing pipelines and locating leak source that incoming line is popped one's head in from the line of hunting leak by graftings.
In Fig. 2,3,4, transmitter comprises emission power module, emission control module, the inversion transmitter module 4 being connected with emission control module.Emission power module comprises battery 1, be used to the charging circuit 1, power converting circuit 1 of battery one 3 chargings, the mu balanced circuit 10 being connected with power converting circuit 1.Emission control module comprises countdown circuit 7, for gathering the Acquisition Circuit 1 of launching electric signal and being sent to countdown circuit, for sending idsplay order to the keyboard circuit 1 of countdown circuit, for receiving the display circuit 1 showing after the idsplay order of countdown circuit output, the amplifying circuit 9 being connected with countdown circuit.Inversion transmitter module comprises and being connected successively for the transmitting oscillatory circuit 4-1 that converts the electrical signal to audio oscillator signal, driving circuit 4-3, the transformation buffer circuit 4-2 amplifying for the audio oscillator signal that transmitting oscillatory circuit is sent.
In Fig. 5,6,7, receiver comprises reception power module, receives control module.Receive power module and comprise battery 2 19, be used to charger 18, the power converting circuit 2 20 of accumulator 2 19 chargings.Receive control module and comprise reception control circuit 13, be used for the Acquisition Circuit 2 11 that gathers the electric signal of pipe under test and be sent to reception control circuit, the filter amplification circuit 12 of the electric signal gathering for the treatment of Acquisition Circuit two, for sending idsplay order to the keyboard circuit 2 16 of reception control circuit, for receiving the display circuit 2 17 showing after the idsplay order of reception control circuit output, the audible alarm circuit 14 being connected with reception control circuit 13 through voltage-frequency conversion circuit 15.Wherein, Acquisition Circuit 2 11 comprises that Acquisition Circuit two 11-1(probes gather field signal, leak detection line gathers potential difference signal) and Acquisition Circuit two 11-2(cell voltages collections).Reception control circuit 13 comprises reception control circuit 13-1 and reception control circuit 13-2.Display circuit 2 17 comprises display circuit two 17-1 and display circuit two 17-2.
In Fig. 8, buried pipeline detecting step:
1, transmitting audio frequency guided electromagnetic wave: it is different that transmitting audio frequency guided electromagnetic wave and common long distance pipeline detect anticorrosive coat breaking point, transmitter 21 applies detection signal from detecting the position of stake 23, marking current can transmit to both direction, must ensure enough marking currents to one side transmission detecting, otherwise take the technical measures such as ground connection current limliting drainage contracting distance, the origin of Here it is audio frequency guided electromagnetic wave.Guarantee extremely can be radiated earth's surface at the electromagnetic field at detection segment interior conduit corrosion fault place.
2, control tube pipeline in one step detects length: the pipe detection cycle according to national regulation regulation is detected, and during the corrosion of detector tube pipeline outer wall, disposable detection length is controlled within 5 kilometers; While detecting inner and outer walls of pipeline corrosion, disposable detection length is controlled at 2 kilometers; In the later stage in conduit running life-span, anticorrosive coat and body are in pipeline poor, bad state, and disposable detection length is controlled at 1 kilometer; Close on the pipeline of scrapping, disposable detection distance also will shorten.Desirable detection corrosive pipeline fault and pipelines distance is than being 0.5:1.
3, detect at twice pipeline electromagnetic field:
Bigness scale for the first time: detect and evaluate magnetic field attenuation exception on pipeline by hundred meters of magnetic field attenuation methods; Be depicted as histogram.
Carefully survey for the second time: at magnetic field attenuation exception encryption detection point.The abnormal central point of detection and location electric potential gradient and the abnormal central point of magnetic potential gradient, the namely hot spot of targeted duct inside and outside wall.
4, Direct Analysis judgement or draw judges with the analysis of cartesian geometry method: according to pipeline, bury the native degree of depth, with π times of gap ratio of the degree of depth to the magnetic field data magnetic difference of potential; Magnetic field, location equipotential surface central point, has also just located corrosive pipeline point.Measure near the ground potential gradient of this point, distinguish corrosive pipeline point at pipeline outer wall or at inner-walls of duct.
5, measuring channel buries the native degree of depth: according to pipeline, bury the native degree of depth, with π times of gap ratio of the degree of depth to the magnetic field data magnetic difference of potential; Magnetic field, location equipotential surface central point, has also just located corrosive pipeline point.π times of gap ratio is to electric field data potential difference (PD); Positioning electric field equipotential surface central point, has also just located the outer hot spot of pipeline.Having got rid of the outer hot spot of pipeline is exactly pipeline corrosion point.
6, transmitting, reception signal method: the emission line of transmitter 21 is connected with the detection stake 23 of pipeline 25, and ground wire is connected with the earth, and pipeline and the earth need impedance matching, forms a complete loops network.After transmitter 21 has regulated, be placed on as you werely, also can send special messenger to guard.Signal circuit can have two kinds of modes: i.e. single line-ground return circuit and line-line loop.Receiving field signal is completed by the slotting probe 24 of pipe locator receiver 22-2.Receiving potential difference signal is completed by the slotting leak detection of detector receiver 22-1 line.Point-to-point transmission potential difference (PD) both can be measured conduction current by grounded probe, also can receive displacement current by Pearson, can also two kinds of method dual-purposes.Wherein, 26 for missed signal electric current indicates, and 27 is magnetic line of force sign.
Claims (4)
1. audio frequency guided wave detects a device for Buried Pipeline, it is characterized in that: comprise transmitter (21) and with the receiver (22) of transmitter cooperating;
Described transmitter comprises emission power module, emission control module, the inversion transmitter module (4) being connected with emission control module;
Described emission control module comprises countdown circuit (7), for gathering the Acquisition Circuit one (5) of launching electric signal and being sent to countdown circuit, for sending idsplay order to the keyboard circuit one (8) of countdown circuit, for receiving the display circuit one (6) showing after the idsplay order of countdown circuit output, the amplifying circuit being connected with countdown circuit (9);
Described inversion transmitter module comprises and being connected successively for the transmitting oscillatory circuit (4-1) that converts the electrical signal to audio oscillator signal, driving circuit (4-3), the transformation buffer circuit (4-2) amplifying for the audio oscillator signal that transmitting oscillatory circuit is sent;
Described receiver comprises reception power module, receives control module;
Described reception control module comprises reception control circuit (13), be used for the Acquisition Circuit two (11) that gathers the electric signal of pipe under test and be sent to reception control circuit, the filter amplification circuit (12) of the electric signal gathering for the treatment of Acquisition Circuit two, for sending idsplay order to the keyboard circuit two (16) of reception control circuit, for receiving the display circuit two (17) showing after the idsplay order of reception control circuit output, the audible alarm circuit (14) being connected with reception control circuit (13) through voltage-frequency conversion circuit (15).
2. audio frequency guided wave according to claim 1 detects the device of Buried Pipeline, it is characterized in that: described every transmitter is joined two receivers.
3. audio frequency guided wave according to claim 1 detects the device of Buried Pipeline, it is characterized in that: described emission power module comprises battery one (3), is used to the charging circuit (1) of battery one (3) charging, power converting circuit one (2), the mu balanced circuit (10) that is connected with power converting circuit one (2).
4. audio frequency guided wave according to claim 1 detects the device of Buried Pipeline, it is characterized in that: described reception power module comprises battery two (19), is used to charger (18), the power converting circuit two (20) of battery two (19) chargings.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420081002.3U CN203838350U (en) | 2014-02-26 | 2014-02-26 | Device for detection of corrosion of buried pipe through audio frequency guided wave |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420081002.3U CN203838350U (en) | 2014-02-26 | 2014-02-26 | Device for detection of corrosion of buried pipe through audio frequency guided wave |
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| Publication Number | Publication Date |
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| CN203838350U true CN203838350U (en) | 2014-09-17 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201420081002.3U Expired - Fee Related CN203838350U (en) | 2014-02-26 | 2014-02-26 | Device for detection of corrosion of buried pipe through audio frequency guided wave |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105042340A (en) * | 2015-07-01 | 2015-11-11 | 中国石油天然气集团公司 | Leakage detection device and method for double-searching-unit buried steel pipeline |
| CN108414615A (en) * | 2018-01-05 | 2018-08-17 | 广州特种承压设备检测研究院 | A kind of nonmetallic erosion resistant coating lamination defect supersonic detection method and device |
| KR20180116911A (en) * | 2017-04-18 | 2018-10-26 | 씨에이프로텍 주식회사 | Detecting method of pore area in underground pipes |
-
2014
- 2014-02-26 CN CN201420081002.3U patent/CN203838350U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105042340A (en) * | 2015-07-01 | 2015-11-11 | 中国石油天然气集团公司 | Leakage detection device and method for double-searching-unit buried steel pipeline |
| KR20180116911A (en) * | 2017-04-18 | 2018-10-26 | 씨에이프로텍 주식회사 | Detecting method of pore area in underground pipes |
| KR101949768B1 (en) * | 2017-04-18 | 2019-02-19 | 씨에이프로텍 주식회사 | Detecting method of pore area in underground pipes |
| CN108414615A (en) * | 2018-01-05 | 2018-08-17 | 广州特种承压设备检测研究院 | A kind of nonmetallic erosion resistant coating lamination defect supersonic detection method and device |
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Legal Events
| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20140917 Termination date: 20170226 |