CN105823723B - Circumferential magnetic flux leakage detection method for corrosion of inner surface of tank body of buried storage tank of gas station - Google Patents
Circumferential magnetic flux leakage detection method for corrosion of inner surface of tank body of buried storage tank of gas station Download PDFInfo
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- 238000001514 detection method Methods 0.000 title claims abstract description 84
- 230000004907 flux Effects 0.000 title claims abstract description 29
- 230000007797 corrosion Effects 0.000 title claims abstract description 19
- 238000005260 corrosion Methods 0.000 title claims abstract description 19
- 230000007547 defect Effects 0.000 claims abstract description 43
- 238000011088 calibration curve Methods 0.000 claims abstract description 19
- 238000000034 method Methods 0.000 claims abstract description 14
- 239000000463 material Substances 0.000 claims abstract description 6
- 230000005540 biological transmission Effects 0.000 claims description 22
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- 238000006243 chemical reaction Methods 0.000 claims description 10
- 239000003638 chemical reducing agent Substances 0.000 claims description 6
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- 230000001360 synchronised effect Effects 0.000 claims description 3
- 230000035939 shock Effects 0.000 claims 2
- 239000011527 polyurethane coating Substances 0.000 claims 1
- 238000005516 engineering process Methods 0.000 description 5
- 230000005415 magnetization Effects 0.000 description 4
- 230000004044 response Effects 0.000 description 4
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
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- 239000010959 steel Substances 0.000 description 2
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Abstract
本发明涉及加油站埋地储罐罐体内表面腐蚀周向漏磁检测方法。目的是提供的方法具有适用范围广的特点。技术方案是：一种加油站埋地储罐罐体内表面腐蚀周向漏磁检测方法，包括以下步骤：(1)标定阶段：将检测装置运行在定制有人工标准缺陷的标定板上，最终得到每个磁传感器的检测标定曲线；(2)检测阶段：将检测装置运行在和标定板相同厚度相同材料的加油站埋地储罐罐体内，通过比对磁传感器的检测标定曲线即获得被检储罐的腐蚀缺陷当量。
The invention relates to a circumferential magnetic flux leakage detection method for corrosion of the inner surface of a buried storage tank of a gas station. The aim is to provide a method with a wide range of applicability. The technical solution is: a circumferential magnetic flux leakage detection method for corrosion on the inner surface of a buried storage tank of a gas station, comprising the following steps: (1) a calibration stage: running a detection device on a calibration board customized with artificial standard defects, and finally obtaining The detection calibration curve of each magnetic sensor; (2) Detection stage: run the detection device in the gas station buried storage tank with the same thickness and the same material as the calibration plate, and obtain the detected calibration curve by comparing the detection calibration curve of the magnetic sensor. Corrosion defect equivalent of the tank.
Description
Technical Field
The invention relates to the technical field of detection of a buried storage tank of a gas station, in particular to a circumferential magnetic flux leakage detection method for corrosion of the inner surface of a tank body of the buried storage tank of the gas station, which can also be suitable for detection of horizontal containers and tank cars with certain specific curvatures.
Background
The buried storage tanks of the gas station are wide in quantity, are usually arranged in a direct-buried mode, medium leakage is easy to cause due to the inevitable defects of ageing, corrosion and the like of storage tank materials, and serious economic and social losses are easy to cause due to the concealment and the particularity of the underground storage tanks. Because the dangerousness and the space limitation of the storage medium of the buried storage tank cannot meet the requirement that the surface to be detected is polished by the conventional ultrasonic detection and magnetic particle detection nondestructive detection method, the conventional nondestructive detection method cannot realize reliable and comprehensive detection on the storage tank, so that the buried storage tank is always in the marginal zone of the detection technology, and simultaneously, China also lacks effective underground storage tank safety detection monitoring technology and detection instrument equipment. Therefore, the buried storage tank has a technical blind area for safety detection.
Disclosure of Invention
The invention aims to overcome the defects of the background technology and provides a circumferential magnetic flux leakage detection method for corrosion of the inner surface of the buried storage tank body of a gas station.
The technical scheme provided by the invention is as follows:
a circumferential magnetic flux leakage detection method for corrosion of the inner surface of a tank body of a buried storage tank of a gas station comprises the following steps:
(1) a calibration stage: running a detection device on a calibration plate customized with artificial standard defects, wherein the calibration plate is provided with three groups of defects, each group comprises 4 circular defects with the depth/plate thickness of 20%, 40%, 60% and 80%, and the defect interval is 60 mm; the axial direction interval of each group of defects is 0.3d, and the circumferential direction interval is 120 mm; uniformly dividing the magnetic sensor group into a left group, a middle group and a right group for respective calibration, and aligning the middle position of the magnetic sensor array group to the group of defects in the middle of the calibration plate during calibration; after calibration, characteristic signal values of four defects of 20%, 40%, 60% and 80% on a calibration plate corresponding to each sensor can be obtained, and according to grouping of three groups of sensors, the sensor with the largest characteristic signal value in each group is taken as a characteristic sensor to determine three characteristic sensors; obtaining a detection calibration curve of each characteristic sensor according to the characteristic signal values of four defects obtained from the calibration plate of each characteristic sensor by linear fitting; assigning the detection calibration curve of each group of characteristic sensors to other sensors in the group to finally obtain the detection calibration curve of each magnetic sensor;
(2) a detection stage: the detection device is operated in a buried storage tank body of a gas station which is made of the same material with the same thickness as the calibration plate, the magnetic sensor group obtains magnetic flux leakage detection digital signals, and the magnetic flux leakage signals capable of identifying corrosion defects are processed and analyzed by the magnetic sensor group; and obtaining the equivalent of the corrosion defect of the detected storage tank by comparing the detection calibration curve of the magnetic sensor.
The digital signal processing steps are as follows:
(1) performing first-order difference processing on the signal y1(n) ═ x (n) -x (n-1);
(2) performing low-pass digital filtering processing on the signal y2(n) ═ y1(n) × h1 (n);
(3) inverse processing of the signal y3(N) ═ y2(N-1-N)
(4) Performing high-pass digital filtering processing on the signal y4(n) ═ y3(n) × h2 (n);
(5) performing inverse processing on the signal y (N) y4 (N-1-N);
where x (N) is the original sequence of the signal, N is the sequence length of the signal, h1(N) is the low-pass digital filter impulse response sequence, h2(N) is the high-pass digital filter impulse response sequence, and y (N) is the output result sequence.
The detection device comprises a frame and a traction driving assembly for driving the frame, wherein a magnetizing structure assembly which is attracted to the inner surface of the tank body of the detected storage tank through magnetic force and magnetizes the inner surface of the tank body of the detected storage tank and a 'magnetic-electric' signal conversion and positioning assembly for detecting the inner surface of the tank body of the storage tank are arranged on the frame;
the frame consists of a fixed connecting frame and two side wing fixing plates which are respectively and fixedly connected with the two ends of the fixed connecting frame;
the traction driving assembly comprises a driving caster and a driving motor which drives the driving caster through a speed reducer;
the magnetizing structure component comprises two groups of walking trundles fixed on the side wing fixing plates, and an armature, a permanent magnet and a pole shoe which form a magnetic bridge structure; the magnetizing structure component forms a curved surface structure which accords with a certain specific curvature, and the specific curvature is the same as the curvature of the inner surface of the tank body of the underground storage tank to be detected;
the magnetic-electric signal conversion and positioning component comprises a sensor array group positioned on the armature through a height adjusting component, a transmission joint used for deriving detection data of the sensor array group and an encoder positioning component used for determining a detection position; the encoder positioning assembly comprises a positioning encoder and an encoder transmission gear set, wherein the positioning encoder is fixed on the armature through an encoder fixing support and used for determining a detection position, and the encoder transmission gear set drives the positioning encoder.
The front and the rear groups of walking casters are rotatably positioned on the two side wing fixing plates through supporting shafts which are arranged in parallel, the magnetization structure assembly is arranged between the front and the rear groups of walking casters, and the left end and the right end of the armature are fixedly connected with the two side wing fixing plates respectively.
The sensor array group is positioned between the two pole shoes through the sensor array group mounting plate; the height adjusting assembly comprises two adjusting screw rods, the bottom ends of the two adjusting screw rods are fixed to the back face of the sensor array group mounting plate, the two adjusting screw rods are further respectively sleeved with a height adjusting spring in a penetrating mode, and the top ends of the two adjusting screw rods penetrate through the armature upwards and then are screwed and fixed with the two height adjusting nuts one by one.
The diameter of the driving caster wheel is the same as that of the front and the back groups of walking caster wheels, the axis of the driving caster wheel and the axes of the two support shafts share a certain specific curvature, and the specific curvature is the same as that of the inner wall of the buried horizontal storage tank body to be detected.
The encoder transmission gear set transmits displacement data of the walking caster wheels to the encoder so that the rotation of the encoder is synchronous with the walking of the magnetizing structure assembly.
The drive caster and the walking caster are magnetization-preventing hubs which are externally coated with polyurethane rubber coating layers to prevent the casters from slipping.
A handle is also fixed on the frame.
The magnetic sensor adopted in the sensor array group is a Hall sensor which is horizontally arranged relative to the detection surface and used for detecting a magnetic leakage signal; the mutual spacing distance of the Hall sensors is 5mm-7mm, and the plurality of Hall sensors form the length of the sensor array group.
The invention has the beneficial effects that: the automatic magnetic flux leakage scanning and magnetizing method for the buried storage tank body of the gas station, provided by the invention, can be carried out along the circumferential direction of the tank wall of the storage tank, and has a magnetizing function and a signal conversion and transmission function, so that the detection efficiency is high, the consumption of manpower and material resources is low, and the detection cost is low. The method can be widely applied to detection of steel buried storage tanks, horizontal containers and tank cars (wide application range) and has low detection cost.
Figure illustrates the drawings
Fig. 1 is a schematic perspective view of the present invention.
Fig. 2 is a schematic perspective view of a magnetizing structure assembly with a specific curvature according to the present invention.
Fig. 3 is a schematic perspective view of an encoder positioning assembly according to the present invention.
Fig. 4 is a perspective view of the traction drive assembly of the present invention.
FIG. 5 is a schematic view of a calibration plate of the present invention.
The figure shows that: the device comprises a driving caster wheel 1, a lifting handle 2, a speed reducer 3, a driving motor 4, a fixed connection frame 5, a side wing fixing plate 6, a walking caster wheel 7, an encoder transmission gear set 8, a positioning encoder 9, an encoder data line 10, an encoder fixing support 11, a set height adjusting nut 12, a data line joint 13, an armature 14, a supporting shaft 15, a pole shoe 16, a sensor array set 17, a permanent magnet 18, a height adjusting spring 19, an encoder coupling 20, a calibration plate 21, a circular defect 22 and an adjusting screw rod 23.
Detailed Description
In order to ensure the safe operation of the underground storage tank and provide technical support for safety supervision, the invention introduces a magnetic flux leakage detection technology into the detection of the underground storage tank, and provides a circumferential magnetic flux leakage detection device and a circumferential magnetic flux leakage detection method for the corrosion of the inner surface of the tank body of the buried storage tank of the gas station.
The detection device for the circumferential magnetic flux leakage of the corrosion of the inner surface of the tank body of the buried storage tank of the gas station is mainly applied to detection of steel buried storage tanks, horizontal containers and tank cars, and has the basic functions of automatic walking along the circumferential direction of the storage tank, magnetization and signal conversion and transmission. Because the work wall is buried storage tank inner wall surface, and detect for the comprehensive general investigation of tank wall surface, it is great to need the detection area, and operational environment is also more complicated, consequently filling station's buried storage tank internal surface of jar corrodes circumference magnetic leakage detection device and method and should satisfy following several point requirements:
(1) a certain driving force is required to be kept, so that the robot can automatically walk on the wall surface of the inner surface of the storage tank;
(2) the device has strong magnetization capacity, the magnetization of the detected workpiece is realized by adding a strong magnetic field for magnetic leakage detection, and meanwhile, the strong magnetic field can provide enough adsorption force to prevent the device from falling when the device travels along the wall of the storage tank;
(3) the conversion and transmission of the defect leakage magnetic detection signal can be realized.
The present invention will be further described with reference to the drawings, but the present invention is not limited to the following examples.
As shown in fig. 1 and fig. 2, the automatic magnetic flux leakage scanning and magnetizing device for the buried tank body of the gas station comprises a magnetizing structure component (a magnetizing structure component with a specific curvature), a magnetic-electric signal conversion and positioning component and a traction driving component; the magnetic-electric signal conversion and positioning assembly comprises a sensor array assembly, a transmission joint and an encoder positioning assembly, wherein the sensor array assembly is positioned on the armature through the height adjusting assembly, and the encoder positioning assembly comprises a positioning encoder and an encoder transmission gear set. The magnetic structure component is composed of an armature 14, a permanent magnet 18, pole shoes 16, a side wing fixing plate 6, a walking caster 7 and a walking caster support shaft 15 which form a magnetic bridge structure (wherein the armature 14 is a curved surface structure which conforms to a certain specific curvature, and the two pole shoes are respectively fixed at the front end and the rear end of the armature through permanent magnets to form a bridge structure), the whole magnetic bridge structure is fixed on the side wing fixing plate 6 (the bottom edge of the side wing fixing plate is preferably the same as the curvature of a tank body to be detected), and walking is realized through the walking caster 7 which is sleeved on the support shaft 15 (as shown in figure 1; the walking casters in the magnetizing structure assembly and the driving casters in the traction driving assembly are internally tangent to the inner surface (preferably, a 2450 mm-diameter cylinder) of the storage tank body to be detected, so that the device can move circumferentially along the inner surface of the cylindrical underground storage tank body, and the curvature radius of the magnetic bridge structure can be changed as required to adapt to circumferential detection of the inner surfaces of storage tanks or tank cars with different specifications.
The magnetic-electric signal conversion and positioning component comprises a sensor array group 17 positioned on the armature through a height adjusting component, a transmission joint used for deriving detection data of the sensor array group and an encoder positioning component used for determining a detection position; the detected defect leakage magnetic field is converted into an electric signal which can be processed by a computer through the sensor array group, and the electric signal is transmitted to an external processing terminal through the transmission joint and the data transmission line to be analyzed and processed.
The magnetic sensor adopted by the sensor array group is a Hall sensor which is horizontally arranged relative to the detection surface and used for detecting a magnetic leakage signal; the interval of the Hall sensor array arrangement is 5mm-7mm, and the plurality of Hall sensors form the array length of a magnetic sensor group (namely a sensor array group); these are all of conventional configuration.
The height adjusting assembly is structurally characterized in that: the two adjusting screws 23 are respectively sleeved with the height adjusting springs 19, the bottom ends of the two adjusting screws are fixed on the back of the sensor array group mounting plate, and the top ends of the two adjusting screws penetrate through the armature upwards and are then respectively screwed and fixed with the two height adjusting nuts 12 one by one. Obviously, when the two height adjusting nuts are screwed, the sensor array set moves up and down, so that the distance between the sensor array set and the surface of the detected tank body is changed.
The encoder positioning assembly comprises a positioning encoder 9 and an encoder transmission gear set 8, wherein the positioning encoder 9 is fixed on an armature iron through an encoder fixing support 11 and used for determining a detection position, the encoder transmission gear set 8 drives the positioning encoder (the encoder transmission gear set can be seen in fig. 3 and comprises a driving gear 8-1 fixed on the end face of a walking caster and a driven gear 8-2 meshed with the driving gear, the driven gear is fixed on an encoder shaft 8-3 through an encoder coupling 20), the encoder transmission gear set transmits displacement data of the walking caster to the encoder, and then position signals are transmitted to a transmission joint through an encoder data line 10 so that the rotation of the encoder is synchronous with the walking of the magnetized structure assembly, and therefore the defect positioning in the detection process is achieved.
The traction driving assembly comprises a driving caster wheel 1 and a driving motor 4 which drives the driving caster wheel through a speed reducer 3. Shown in FIG. 4 are: the direct current driving motor, the speed reducer (worm and gear speed reducer), the driving caster wheel and the lifting handle 2 used for placing and lifting the whole device are all fixed on the fixed connection frame 5.
In order to detect accurately, calibration is required before detection. A calibration plate 21 (calibration plate with curvature) shown in fig. 5, the curvature being the same as that of the inner surface of the tank body to be inspected; the circular defect 22 on the calibration plate is known in advance so that the performance of the leakage flux test of the present invention can be tested by testing the calibration plate.
Because the magnetizing structure assembly has a certain curvature, certain magnetic field nonuniformity exists in the horizontal distribution of the magnetic sensor array, and therefore, the calibration curve of all the sensors is determined to have large error by using the traditional one-time calibration. In order to reduce the error, the magnetic sensor group is uniformly divided into a left group, a middle group and a right group for respective calibration, and in order to rapidly calibrate the three groups of sensors at one time, a calibration plate with three groups of defects is adopted for calibration. The three groups of defects are spaced at intervals in the horizontal and vertical directions in consideration of interference between the defects to signals. During calibration, the middle position of the magnetic sensor array set is aligned with the middle set of defects. After calibration, characteristic signal values of 20%, 40%, 60% and 80% of four defects corresponding to each sensor can be obtained, and respective detection calibration curves and fitted curve slopes are formed. And setting the final detection calibration curve of each sensor in the left, middle and right three groups of magnetic sensors as the calibration curve with the maximum curve slope of each group.
The using method of the invention comprises the following steps:
(1) a calibration stage: the inspection apparatus was run on a calibration plate customized with standard defects, with three sets of defects, each set containing 4 circular defects with depth/thickness of 20%, 40%, 60%, 80%, respectively, and defect spacing of 60 mm. The axial direction spacing of each set of defects was 0.3d, and the circumferential direction spacing was 120 mm. The magnetic sensor group is uniformly divided into a left group, a middle group and a right group for respective calibration, and the middle position of the magnetic sensor array group is aligned to the group of defects in the middle of the calibration plate during calibration. After calibration, characteristic signal values of four defects of 20%, 40%, 60% and 80% on a calibration plate corresponding to each sensor can be obtained, and according to grouping of three groups of sensors, the sensor with the largest characteristic signal value in each group is taken as a characteristic sensor, so that three characteristic sensors are determined. The detection calibration curve of each characteristic sensor can be obtained according to linear fitting of the characteristic signal values of the four defects of each characteristic sensor, which are obtained from the calibration plate. And assigning the detection calibration curve of each group of characteristic sensors to other sensors in the group to finally obtain the detection calibration curve of each magnetic sensor.
(2) A detection stage: the detection device is operated in a buried storage tank body of a gas station which is made of the same material with the same thickness as the calibration plate, the magnetic sensor group obtains a magnetic leakage detection signal, the magnetic leakage detection signal is transmitted to a computer of an external processing terminal through a transmission connector and a data wire, signal processing and analysis are carried out, and the magnetic leakage signal of corrosion defects is identified. And obtaining the equivalent of the corrosion defect of the detected storage tank through the detection calibration curve of the magnetic sensor.
The signal processing steps are as follows:
(1) performing first-order difference processing on the signal y1(n) ═ x (n) -x (n-1);
(2) performing low-pass digital filtering processing on the signal y2(n) ═ y1(n) × h1 (n);
(3) inverse processing of the signal y3(N) ═ y2(N-1-N)
(4) Performing high-pass digital filtering processing on the signal y4(n) ═ y3(n) × h2 (n);
(5) the signal is subjected to an inverse process y (N) ═ y4 (N-1-N).
Where x (N) is the original sequence of the signal, N is the sequence length of the signal, h1(N) is the low-pass digital filter impulse response sequence, h2(N) is the high-pass digital filter impulse response sequence, and y (N) is the output result sequence.
Since the magnetic flux leakage detection technology is mature and has been applied and popularized, the detection principle is not described in detail.
All the components can be purchased from other places.
Claims (9)
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| CN107300584A (en) * | 2017-07-05 | 2017-10-27 | 黄冈职业技术学院 | Corrosion of steel structure Magnetic sensing methods in a kind of armored concrete |
| CN109975426B (en) * | 2017-12-28 | 2023-10-20 | 核动力运行研究所 | Circumferential positioning device and method of large-diameter cylinder inner wall ultrasonic detection equipment |
| CN109187733A (en) * | 2018-09-12 | 2019-01-11 | 湖北工业大学 | Large-scale storage tank tank skin defect detecting device |
| CN109884171A (en) * | 2019-04-12 | 2019-06-14 | 中国石油化工股份有限公司 | A kind of operation location structure for plate Magnetic Flux Leakage Inspecting |
| CN110208366B (en) * | 2019-06-21 | 2023-10-20 | 西红柿科技（武汉）有限公司 | Integrated excitation unit for magnetic leakage detection |
| CN111157612A (en) * | 2020-01-16 | 2020-05-15 | 浙江省特种设备科学研究院 | A new type of storage tank floor defect detection device and detection method |
| CN113051325A (en) * | 2021-03-25 | 2021-06-29 | 陕西延长石油（集团）有限责任公司 | Storage tank detection data display analysis method, system, medium, equipment and application |
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