A monitoring device for on-line imaging of corrosion under coating

Abstract

The application discloses a kind of monitoring devices for corrosion under anticorrosive coating online imaging, comprising: box, sensor module and control module, accommodating cavity is formed in box, box is located on pipeline, sensor module is located in box, sensor module includes multiple sensor probes, multiple sensor probes are arranged in array, each sensor probe is correspondingly arranged with one pressure adjustment piece, elastic member is arranged between pressure adjustment piece and corresponding sensor probe, elastic member always has the force of sensor probe towards pipeline, control module is electrically connected with sensor module.According to the monitoring device for corrosion under anticorrosive coating online imaging of the application, the corrosion state of the pipe body under the anticorrosive coating is continuously, stably and highly accurately monitored online without damaging the anticorrosive coating, solving the problems of low detection efficiency, easy to miss detection, unstable contact and difficult to visualize positioning of the corrosion area in the traditional way, and improving the early identification ability of pipeline concealed corrosion.

Description

Technical Field

[0001] This invention relates to the field of pipeline corrosion protection layer detection technology, and in particular to a monitoring device for online imaging of corrosion under the corrosion protection layer. Background Technology

[0002] Related technologies indicate that metal pipelines are widely used in water conservancy and hydropower, petrochemical, heating transmission, municipal pipe networks, pressurized water transmission, and industrial media transportation. To reduce the corrosive effects of external moisture, soil media, chemical media, and air on the pipe body, the outer surface of the pipe is usually covered with an anti-corrosion layer, which isolates the metal pipe body from the external corrosive environment. With long-term service, the anti-corrosion layer may fail locally due to aging, localized debonding, mechanical damage, construction defects, or media infiltration, leading to hidden corrosion of the pipe body beneath the anti-corrosion layer. Because this type of corrosion is concealed by the anti-corrosion layer, it is not easily observed visually. Therefore, corrosion detection sensors, signal acquisition modules, and online monitoring systems are needed to monitor the corrosion status of the pipe body beneath the anti-corrosion layer.

[0003] Current pipeline corrosion detection methods mostly employ manual inspections, fixed-point detection, or point-by-point testing with portable detectors. These methods require operators to inspect sections along the pipeline's length, resulting in low efficiency. Furthermore, the reliance on manual selection of inspection points increases the risk of missed detections. For pipes covered with anti-corrosion coatings, traditional detection equipment struggles to reliably acquire corrosion response information from the pipe beneath the coating without damaging it significantly. Some methods even require removing parts of the anti-corrosion layer or repositioning inspection points on the pipe surface, making the process cumbersome and unsuitable for long-term online monitoring. Additionally, the contact between traditional probes and the pipe's outer surface is easily affected by pipe curvature, anti-corrosion coating thickness, surface unevenness, and loose installation, leading to unstable detection spacing or contact pressure, thus impacting the continuity and accuracy of the corrosion response signal.

[0004] Furthermore, while some existing online corrosion monitoring devices can acquire corrosion signals from single points or a small number of detection points, their results are mostly presented as numerical values, alarm thresholds, or single-point statuses, making it difficult to intuitively reflect the location, extent, and trend of corrosion areas beneath the anti-corrosion layer. When multiple corrosion points or corrosion areas exist locally in the pipe body or extend along the pipe's axial and circumferential directions, traditional equipment struggles to establish a clear correspondence between signals from different detection locations and the pipe surface area, and it is also difficult to generate a visualized corrosion distribution image. This results in maintenance personnel only being able to determine if an anomaly exists, but not being able to quickly pinpoint the location and direction of corrosion, which is detrimental to subsequent maintenance location, risk assessment, and pipeline maintenance decisions. Summary of the Invention

[0005] This invention aims to at least solve one of the technical problems existing in the prior art. To this end, this invention proposes a monitoring device for online imaging of corrosion beneath the anti-corrosion layer. This device enables continuous, stable, and high-precision online imaging monitoring of the corrosion state of the pipe body beneath the anti-corrosion layer without damaging it. This solves the problems of low detection efficiency, easy missed detections, unstable contact, and difficulty in visualizing and locating the corrosion area in traditional methods.

[0006] The monitoring device for online imaging of corrosion under the anti-corrosion layer according to the present invention includes: a housing with a receiving cavity formed therein, and the housing being disposed on a pipeline; a sensor module disposed within the housing, the sensor module including a plurality of sensor probes arranged in an array, each sensor probe being correspondingly provided with a clamping adjustment component, the clamping adjustment component being used to adjust the extension amount of the corresponding sensor probe in the radial direction of the pipeline, an elastic element being provided between the clamping adjustment component and the corresponding sensor probe, the elastic element always having a force that causes the sensor probe to face toward the pipeline; and a control module electrically connected to the sensor assembly.

[0007] The online imaging monitoring device for corrosion under the anti-corrosion layer according to the present invention, by setting up multiple arrayed sensor probes and clamping adjustment components, realizes continuous, stable and high-precision online imaging monitoring of the corrosion status of the pipe body under the anti-corrosion layer without damaging the anti-corrosion layer. It solves the problems of low detection efficiency, easy to miss detection, unstable contact and difficulty in visually locating the corrosion area in the traditional method, and improves the early identification capability and maintenance efficiency of hidden corrosion of pipelines.

[0008] In some feasible embodiments, the housing is provided with a mounting plate adapted to the shape of the pipe, at least a portion of the mounting plate extending in an arc shape along the circumference of the pipe, and a plurality of the sensor probe arrays are arranged on the mounting plate.

[0009] In some feasible embodiments, a mounting hole is formed on the mounting plate, a first thread is formed in the mounting hole, and a second thread is formed on the adjusting member, wherein the first thread engages with the second thread.

[0010] In some feasible embodiments, the monitoring device for online imaging of corrosion under the anti-corrosion layer further includes a connecting component, through which the housing is detachably connected to the pipeline.

[0011] In some feasible embodiments, the inner wall and / or the outer wall of the enclosure are provided with a shielding layer.

[0012] In some feasible embodiments, the control module and the sensor module are electrically connected via a wiring harness. The housing has a through hole, one end of the wiring harness is connected to the sensor module, and the other end passes through the through hole and is connected to the control module. A sealing ring is provided at the through hole.

[0013] In some feasible embodiments, the box body includes a box cover and a box base, and a sealing element is provided between the box cover and the box base.

[0014] In some feasible embodiments, the control module includes: a signal acquisition module, a data processing module, an imaging display module, and a communication module. The signal acquisition module is signal-connected to the sensor module, and the data processing module is signal-connected to the signal acquisition module to establish a mapping relationship between the detection position and the surface area of ​​the pipe based on the array position number of the sensor module and generate corrosion distribution data. The imaging display module is signal-connected to the data processing module, and the communication module is signal-connected to both the data processing module and the imaging display module.

[0015] In some feasible embodiments, the signal acquisition module configures each sensor probe with an acquisition channel and a position number, the position number corresponding one-to-one with the array coordinates of the sensor probe in the housing; the signal acquisition module acquires information from each acquisition channel according to a preset sampling period, and outputs the acquisition results to the data processing module according to the position number.

[0016] In some feasible embodiments, the data processing module is used to process and store the detection signal to generate historical trend data to characterize the expansion, enhancement, weakening or migration of the corrosion area.

[0017] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of a monitoring device for online imaging of corrosion under the anti-corrosion layer according to an embodiment of the present invention; Figure 2 yes Figure 1 A schematic cross-sectional view of the monitoring device for online imaging of corrosion under the anti-corrosion layer shown in the figure; Figure 3 yes Figure 1 The diagram shows the connection between the monitoring device and the control module for online imaging of corrosion under the anti-corrosion layer.

[0019] Figure label: 100. Monitoring device for online imaging of corrosion under anti-corrosion layer; 1. Housing; 11. Mounting plate; 2. Sensor module; 21. Sensor probe; 22. Clamping adjustment component; 23. Elastic component; 3. Connecting assembly; 31. Clamp; 32. Locking component; 4. Wiring harness; 5. Signal acquisition module; 6. Data processing module; 7. Imaging display module; 8. Communication module; 9. Remote monitoring terminal; 200. Pipeline. Detailed Implementation

[0020] Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0021] The following is for reference. Figures 1-3 A monitoring device 100 for online imaging of corrosion under the anti-corrosion layer according to an embodiment of the present invention is described.

[0022] like Figures 1-3 As shown, the monitoring device 100 for online imaging of corrosion under the anti-corrosion layer according to an embodiment of the present invention includes: a housing 1, a sensor module 2, and a control module.

[0023] Specifically, a receiving cavity is formed inside the housing 1, and the housing 1 is located on the pipe 200. The sensor module 2 is located inside the housing 1. The sensor module 2 includes multiple sensor probes 21, which are arranged in an array. Each sensor probe 21 is correspondingly provided with a clamping adjustment component 22. The clamping adjustment component 22 is used to adjust the extension amount of the corresponding sensor probe 21 in the radial direction of the pipe 200. An elastic component 23 is provided between the clamping adjustment component 22 and the corresponding sensor probe 21. The elastic component 23 always has a force that makes the sensor probe 21 face the pipe 200. The control module is electrically connected to the sensor assembly.

[0024] Understandably, housing 1 serves to house and protect other components. Multiple sensor probes 21 are arrayed for multi-point synchronous detection, improving detection efficiency and eliminating the risk of missed detections caused by manual point selection. With known spatial coordinates at multiple points, the signals collected by each probe naturally carry positional information. The control module can map the corrosion status of each detection point to the corresponding grid area on the surface of the pipe 200. By setting a clamping adjustment component 22, operators can independently pre-adjust the radial extension of each probe based on the actual outer diameter of the pipe at the current installation location and the specific thickness of the anti-corrosion layer. For example, when the anti-corrosion layer is thicker or the pipe diameter is smaller, the probe extension can be increased accordingly, allowing its detection end face to approach or contact the anti-corrosion layer surface. This independent adjustment capability allows housing 1 to adapt to pipes 200 with different diameters and anti-corrosion layer thicknesses, improving the device's versatility and on-site adaptability. Pre-adjustment eliminates the problem of probe suspension or excessive compression caused by differences in pipe curvature, ensuring that each probe is within the effective detection distance range during initial installation, avoiding signal attenuation or failure due to excessive installation gaps.

[0025] Furthermore, by incorporating the elastic element 23, the problem of unstable contact conditions caused by uneven pipe surfaces, loose installation, or thermal deformation during operation in traditional testing is solved, ensuring that each probe maintains consistent detection coupling conditions throughout long-term service. Stable contact pressure or spacing directly improves the repeatability and signal-to-noise ratio of the corrosion response signal, avoiding false signals or data jumps caused by probe shaking or detachment, thus ensuring the continuity and accuracy of online monitoring data.

[0026] The online imaging monitoring device 100 for corrosion under the anti-corrosion layer according to an embodiment of the present invention, by setting up multiple arrayed sensor probes 21 and clamping adjustment components 22, realizes continuous, stable and high-precision online imaging monitoring of the corrosion status of the pipe body under the anti-corrosion layer without damaging the anti-corrosion layer. It solves the problems of low detection efficiency, easy to miss detection, unstable contact and difficulty in visually locating the corrosion area in the traditional method, and improves the early identification capability and maintenance efficiency of the hidden corrosion of the pipeline 200.

[0027] In some embodiments of the present invention, such as Figure 2As shown, the housing 1 is equipped with a mounting plate 11 adapted to the shape of the pipe 200. At least a portion of the mounting plate 11 extends in an arc shape along the circumference of the pipe 200, and multiple sensor probes 21 are arrayed on the mounting plate 11. It can be understood that by setting a mounting plate 11 adapted to the shape of the pipe 200 and extending in an arc shape along the circumference inside the housing 1, and arranging multiple sensor probes 21 arrayed on the arc-shaped mounting plate 11, synchronous coverage of multiple angles in the circumference is achieved, eliminating the probe skew problem caused by curvature. The arc-shaped mounting plate 11 ensures that the normal direction of each probe mounting position always points to the axis of the pipe body, ensuring that the detection main axis of each probe coincides with the radial direction of the pipe body, thereby improving the directional consistency and energy coupling efficiency of the detection signals of each channel.

[0028] For example, the sensor probe 21 can be a point contact head, a line contact head, or an arc surface contact head to adapt to anti-corrosion layers with different curvatures and surface conditions.

[0029] In other embodiments, the mounting plate 11 is composed of multiple sub-plates joined together.

[0030] In some embodiments of the present invention, a mounting hole is formed on the mounting plate 11, a first thread is formed in the mounting hole, and a second thread is formed on the adjusting member, with the first thread engaging with the second thread. It is understood that when the adjusting member 22 is screwed into the mounting hole, the tooth surfaces of the second thread and the first thread contact and engage with each other, forming a complete helical motion pair. This allows the rotational motion applied to the adjusting member by the operator to be precisely converted into axial linear motion of the adjusting member relative to the mounting plate 11, thereby achieving stepless adjustment of the probe's radial extension. When the adjustment is complete, the threaded pair naturally forms a self-locking state under the combined action of static friction and axial load, preventing the adjusting member from retracting due to vibration or external impact.

[0031] In some embodiments of the present invention, the monitoring device 100 for online imaging of corrosion under the anti-corrosion layer further includes a connecting component 3, wherein the housing 1 is detachably connected to the pipeline 200 via the connecting component 3. It is understood that by providing the connecting component 3, the monitoring device can be quickly installed, accurately positioned, non-destructively fixed, and flexibly replaced on the pipeline 200, solving the problems of irreversible installation caused by traditional welding fixing methods, heat damage to the pipeline 200 base material, and the loosening and failure of adhesive or binding methods under long-term vibration, making them unreplaceable and unusable.

[0032] like Figure 1 and Figure 2 As shown, the connecting component 3 includes a clamp 31 and a locking member 32. The clamp 31 is sleeved on the outer periphery of the pipe 200, and the locking member 32 is connected to the clamp 31 to lock the clamp 31 to the pipe 200.

[0033] In some embodiments of the present invention, the inner wall and / or outer wall of the housing 1 are provided with a shielding layer. It is understood that by providing a shielding layer on the inner wall and / or outer wall of the housing 1, electromagnetic protection is achieved for the signal transmission process of the sensor probe 21 array. This solves the problem that weak corrosion response signals are easily contaminated, have reduced signal-to-noise ratio, or even completely submerged in environments with strong electromagnetic interference (such as areas near high-voltage transmission lines, near large motor frequency converters, lightning transient induction fields, and stray current fields generated by the cathodic protection system of pipeline 200). This enables high-fidelity acquisition and stable transmission of monitoring data in complex industrial electromagnetic environments. Simultaneously, the physical isolation effect of the shielding layer enhances the device's resistance to electrostatic discharge and external radio frequency interference, providing a clean and reliable original signal source for the imaging system and ensuring the authenticity and accuracy of the corrosion distribution image.

[0034] In some embodiments of the present invention, the control module and the sensor module 2 are electrically connected via a wiring harness 4. The housing 1 has a through hole, one end of which is connected to the sensor module 2, and the other end passes through the through hole and is connected to the control module. A sealing ring is provided at the through hole. It is understood that by setting the sealing ring, moisture, dust, and corrosive media can be effectively prevented from intruding along the gaps in the wires, cutting off all paths for external media to penetrate. This ensures that the housing 1 maintains a dry and clean microenvironment for a long time, effectively preventing the sensor probe 21 from becoming damp and failing, the elastic element 23 from rusting and jamming, and the circuit board from short-circuiting and corroding.

[0035] In some embodiments of the present invention, the housing 1 includes a lid and a base, with a sealing element provided between the lid and the base. It is understood that by providing the sealing element, the sealing effect of the accommodating cavity is improved, preventing external moisture, dust, corrosive gases, and liquids from entering the housing 1, thus ensuring the service life of the components inside the housing 1.

[0036] In some embodiments of the present invention, such as Figure 3As shown, the control module includes: a signal acquisition module 5, a data processing module 6, an imaging display module 7, and a communication module 8. The signal acquisition module 5 is signal-connected to the sensor module 2, and the data processing module 6 is signal-connected to the signal acquisition module 5 to establish a mapping relationship between the detection position and the surface area of ​​the pipe 200 based on the array position number of the sensor module 2 and generate corrosion distribution data. The imaging display module 7 is signal-connected to the data processing module 6, and the communication module 8 is signal-connected to both the data processing module 6 and the imaging display module 7. The signal acquisition module 5 configures a single acquisition channel and position number for each sensor probe 21, with the position number corresponding one-to-one with the array coordinates of the sensor probe 21 in the housing 1. The signal acquisition module 5 acquires information from each acquisition channel according to a preset sampling period and outputs the acquisition results to the data processing module 6 according to the position number. The data processing module 6 processes and stores the detection signals to generate historical trend data to characterize the expansion, enhancement, weakening, or migration of the corrosion area.

[0037] Specifically, the signal acquisition module 5 is electrically connected to each sensor probe 21 via connecting cables, and is used to acquire the detection signals of each sensor probe 21 respectively; the data processing module 6 is connected to the signal acquisition module 5, and is used to establish the mapping relationship between the detection position and the surface area of ​​the pipe 200 according to the array position number of the sensor probe 21 and generate corrosion distribution data; the imaging display module 7 is connected to the data processing module 6, and is used to convert the corrosion distribution data into a two-dimensional corrosion state image or a corrosion state image unfolded along the circumference of the pipe 200 and update the display online; the communication module 8 is connected to the data processing module 6 and the imaging display module 7, and is used to send corrosion images, alarm information and historical data.

[0038] Furthermore, the signal acquisition module 5 configures a unique acquisition channel and position number for each sensor probe 21, with the position number corresponding one-to-one with the array coordinates of the sensor probe 21 in the housing 1. The signal acquisition module 5 performs synchronous acquisition or time-sequential polling acquisition on each acquisition channel according to a preset sampling period, and outputs the acquisition results to the data processing module 6 according to the position number. The data processing module 6 is used to filter, drift correct, compare with reference values, interpolate between adjacent detection points, and identify anomalies in the detection signal, and classify the corrosion level of the corresponding detection area according to at least one of the signal amplitude, deviation, and rate of change. The data processing module 6 is also used to store corrosion distribution data at different times and generate historical trend data to characterize the expansion, enhancement, weakening, or migration of the corrosion area. The communication module 8 is any one of a wired communication module 8, a wireless communication module 8, or a gateway communication module 8. After the device is installed, the signal acquisition module 5 synchronously or polls each sensor probe 21 according to a set period. The imaging display module 7 maps the multiple signals acquired at the same time to their respective position numbers and forms an image of the current corrosion state on the interface. As the acquisition time progresses, the imaging display module 7 can also compare the data at different times according to the same position number, thereby generating historical trend change results.

[0039] Regarding abnormal operating conditions, if a signal abrupt change, continuous high noise, or prolonged lack of response occurs in the channel corresponding to a certain sensor probe 21, the signal acquisition module 5 will send the abnormal state to the imaging display module 7. The imaging display module 7 will mark the abnormality at the corresponding location number and send it to the remote monitoring terminal 9 via the communication module 8. During on-site handling, the operator can first check whether the connecting cable is loose, damaged, or has poor contact, then check whether the corresponding clamping adjustment component 22 has shifted due to vibration, and reset the sensor probe 21 under the action of the elastic component 23 before re-clamping it. If the clamp 31 becomes loose as a whole, it usually manifests as reference drift or overall signal change at multiple locations simultaneously. In this case, the clamp 31 should be tightened again using the locking component 32. After confirming that the housing 1 no longer shakes relative to the pipe body, the contact status of each sensor probe 21 should be checked. If the connecting cable is disconnected or a channel is completely interrupted, the remote monitoring terminal 9 can record the fault time, corresponding location, and recovery time. After recovery, the historical record will continue to be retained to facilitate subsequent tracing of whether the fault affects the detection conclusion.

[0040] The following will refer to Figures 1-3 A monitoring device 100 for online imaging of corrosion under the anti-corrosion layer according to two specific embodiments of the present invention is described.

[0041] During installation, the operator first cleans the anti-corrosion layer on the outer surface of the pipe 200 to be tested, removing any loose dust, oil, or other contaminants that might affect the mounting. Then, the housing 1 is placed against the predetermined detection position on the outside of the pipe 200, ensuring that the detection surface of the housing 1 facing the anti-corrosion layer is roughly aligned with the outer arc of the pipe 200. Next, the clamp 31 is wrapped around the outer circumference of the pipe 200 and connected to the housing 1. The connecting end of the clamp 31 is then initially fastened using the locking element 32. At this point, the housing 1 is kept in a pre-tightened state, allowing for fine-tuning. After the axial and circumferential positions of the housing 1 are corrected, the locking element 32 is gradually tightened, ensuring that the clamp 31 provides a stable holding force on the pipe 200, thus reliably fixing the housing 1 to the outside of the anti-corrosion layer. This process ensures positioning before tightening, preventing the housing 1 from tilting during a single tightening process, which could affect the consistency of force applied to subsequent sensors.

[0042] After the housing 1 is fixed in place, the mechanical adjustment process of the detection end begins. The operator rotates each clamping adjustment component 22 in sequence. During the rotation, the clamping adjustment component 22 feeds axially along the housing 1, causing the corresponding elastic component 23 to gradually compress. As the compression of the elastic component 23 increases, the sensor probe 21 moves towards the anti-corrosion layer under the continuous pre-tightening action of the elastic component 23 until the sensor probe 21 makes contact with the anti-corrosion layer or reaches the preset detection distance. If contact detection is used, the operator adjusts in the order of light touch first, then fine adjustment, that is, first make the sensor probe 21 make stable contact with the anti-corrosion layer, and then rotate the clamping adjustment component 22 at a small angle to keep the elastic component 23 with an appropriate amount of compression; if constant distance detection is used, the operator stops pressing after approaching the anti-corrosion layer to keep the sensor probe 21 with a stable working gap. Since each sensor probe 21 corresponds to an independent clamping adjustment component 22 and elastic component 23, it is possible to adjust separately for local curvature changes, surface undulations, or differences in anti-corrosion layer thickness.

[0043] After mechanical adjustment, the connecting harness 4 transmits the detection signals from each sensor probe 21 to the signal acquisition module 5. In this embodiment, the signal acquisition module 5 establishes acquisition channels for each sensor probe 21 and assigns corresponding position numbers according to the arrangement of each sensor probe 21 in the housing 1. Subsequently, the imaging display module 7 performs functional processing on the acquired signals, including filtering, benchmark comparison, interpolation, and level classification. Then, according to the correspondence between the position number and the detection area, it converts the corrosion response at different locations into a visualized corrosion distribution image. The imaging result can be displayed as a strip-shaped two-dimensional image or as a corrosion state image spread out over the detection area of ​​the pipeline 200. Afterward, the communication module 8 sends the image, abnormal information, and historical records to the remote monitoring terminal 9, allowing both on-site and remote monitoring to view the corrosion development status in real time.

[0044] Example 1 illustrates installation for different pipe diameters. When installing on a larger diameter pipe 200, the operator first places the housing 1 in the target detection section, then wraps the clamp 31 around the outer circumference of the pipe 200, and slowly tightens it using the locking element 32 until the housing 1 is stable. Then, each clamping adjustment element 22 is rotated sequentially from one end to the other to establish the contact or spacing relationship between the sensor probe 21 and the anti-corrosion layer. When installing on a smaller diameter pipe 200, because the local relative height difference between the housing 1 and the anti-corrosion layer is more sensitive, the operator should adopt an adjustment sequence of first adjusting the middle and then the sides. That is, first adjust the middle sensor probe 21, and then adjust towards both sides sequentially to prevent the housing 1 from slightly tilting after localized stress. In this case, the locking element 32 should not be tightened all at once, but should be tightened a second time after each sensor probe 21 is initially positioned, thus simultaneously ensuring the stability of the housing 1 and the consistency of the detection end fit.

[0045] Example 2 illustrates adjustments for different anti-corrosion layer thicknesses and surface unevenness. On pipe sections with thicker anti-corrosion layers or more pronounced surface undulations, operators do not aim for all sensor probes 21 to have identical mechanical displacements, but rather for each sensor probe 21 to enter a stable working state. Specifically, a clamping adjustment component 22 can be slowly rotated until the corresponding sensor probe 21 just approaches the anti-corrosion layer and exhibits a stable initial response. Then, a small-angle rotation is continued to maintain a certain amount of compression on the elastic component 23. For protruding surfaces, the rotation of the clamping adjustment component 22 can be appropriately reduced; for concave surfaces, the rotation can be appropriately increased to allow the sensor probe 21 to complete its stroke. If the detection condition requires a constant spacing mode, the operator can slightly retract the clamping adjustment component 22 after the initial response to maintain a stable small spacing between the corrosion detection sensor and the anti-corrosion layer. The consistency of the spacing is confirmed by monitoring the baseline changes in the signal acquisition module 5. This point-by-point fine-tuning method ensures detection quality even under varying anti-corrosion layer thickness and surface unevenness.

[0046] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0047] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0048] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a communication connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0049] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0050] Although embodiments of the invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A monitoring device (100) for online imaging of corrosion under anti-corrosion coating, characterized in that, include: A housing (1) having a receiving cavity inside, and the housing (1) being mounted on a pipe (200); A sensor module (2) is disposed inside the housing (1). The sensor module (2) includes multiple sensor probes (21) arranged in an array. Each sensor probe (21) is provided with a corresponding clamping adjustment member (22). The clamping adjustment member (22) is used to adjust the extension amount of the corresponding sensor probe (21) in the radial direction of the pipe (200). An elastic member (23) is provided between the clamping adjustment member (22) and the corresponding sensor probe (21). The elastic member (23) always has a force that makes the sensor probe (21) face the pipe (200). A control module, which is electrically connected to the sensor assembly.

2. The monitoring device (100) for online imaging of corrosion under the anti-corrosion layer according to claim 1, characterized in that, The housing (1) is provided with a mounting plate (11) adapted to the shape of the pipe (200). At least a portion of the mounting plate (11) extends in an arc shape along the circumference of the pipe (200), and a plurality of sensor probes (21) are arranged in an array on the mounting plate (11).

3. The monitoring device (100) for online imaging of corrosion under the anti-corrosion layer according to claim 2, characterized in that, The mounting plate (11) has a mounting hole, a first thread is formed in the mounting hole, and a second thread is formed on the adjusting member, wherein the first thread engages with the second thread.

4. The online imaging monitoring device for corrosion under the anti-corrosion layer according to claim 3, characterized in that, Also includes: The housing (1) is detachably connected to the pipe (200) via the connecting component (3).

5. The online imaging monitoring device for corrosion under the anti-corrosion layer according to claim 4, characterized in that, The inner wall of the box (1) and / or the outer wall of the box (1) are provided with a shielding layer.

6. The monitoring device (100) for online imaging of corrosion under the anti-corrosion layer according to claim 5, characterized in that, The control module is electrically connected to the sensor module (2) via a wiring harness (4). The housing (1) has a through hole. One end of the wiring harness (4) is connected to the sensor module (2), and the other end passes through the through hole and is connected to the control module. A sealing ring is provided at the through hole.

7. The online imaging monitoring device for corrosion under the anti-corrosion layer according to claim 6, characterized in that, The box body (1) includes a box cover and a box base, and a sealing element is provided between the box cover and the box base.

8. The monitoring device (100) for online imaging of corrosion under the anti-corrosion layer according to any one of claims 1-7, characterized in that, The control module includes a signal acquisition module (5), a data processing module (6), an imaging display module (7), and a communication module (8). The signal acquisition module (5) is connected to the sensor module (2) by signal. The data processing module (6) is connected to the signal acquisition module (5) by signal. The data processing module (6) establishes a mapping relationship between the detection position and the surface area of ​​the pipe (200) according to the array position number of the sensor module (2) and generates corrosion distribution data. The imaging display module (7) is connected to the data processing module (6) by signal. The communication module (8) is connected to both the data processing module (6) and the imaging display module (7) by signal.

9. The monitoring device (100) for online imaging of corrosion under the anti-corrosion layer according to claim 8, characterized in that, The signal acquisition module (5) configures a collection channel and a position number for each sensor probe (21), and the position number corresponds one-to-one with the array coordinates of the sensor probe (21) in the housing (1); The signal acquisition module (5) acquires information from each acquisition channel according to a preset sampling period and outputs the acquisition results to the data processing module (6) according to the location number.

10. The monitoring device (100) for online imaging of corrosion under the anti-corrosion layer according to claim 9, characterized in that, The data processing module (6) is used to process and store the detection signal to generate historical trend data to characterize the expansion, enhancement, weakening or migration of the corrosion area.

Images