Self-walking electric field fingerprint method self-adaptive electrode arrangement pipeline nondestructive testing system

Abstract

The invention provides a self-walking electric field fingerprint method self-adaptive electrode arrangement pipeline nondestructive testing system. The system comprises an annular frame arranged outside a to-be-tested pipeline in a surrounding mode and a self-adaptive electrode arrangement assembly installed on a rail in the annular frame. The swing arm wheel assembly in the annular frame is used for maintaining the relative stability of the position relation between the self-adaptive electrode arrangement assembly and the outer wall of the track to be detected, and the annular frame is used for driving the self-adaptive electrode arrangement assembly to automatically walk along the pipeline. Therefore, the self-adaptive electrode arrangement assembly can be kept in the state of being attached to the surface of the to-be-detected pipe wall in the detection state to detect all positions of the pipeline. Whether the pipeline is corroded and damaged or not can be judged more conveniently and efficiently through the electric field fingerprint method, and the corrosion state of the pipeline can be evaluated more accurately and efficiently.

Description

Technical Field

[0001] The present application relates to the technical field of pipeline detection, and in particular to a self-propelled electric field fingerprint method adaptive electrode arrangement pipeline non-destructive detection system. Background Art

[0002] Pipeline transportation is an important mode of transportation for oil and natural gas, and is also an important mode of material transfer in the chemical industry. During pipeline transportation, the inside and outside of the pipeline often face complex and changeable environments, which can easily cause pipeline corrosion and external damage.

[0003] The existing detection methods for pipeline damage mainly include electric field fingerprint detection, ultrasonic detection, visual inspection, magnetic particle detection, penetration detection and eddy current detection. Among them, electric field fingerprint method is an important technical means to detect pipeline corrosion. The electric field fingerprint method (Field Signature Method, FSM) is mainly used to monitor various material loss defects caused by corrosion. This method has the ability to detect uniform corrosion, weld loss, stress cracks, pitting and erosion, and is applied to the field of corrosion detection of terrestrial oil and gas pipelines. The electric field fingerprint method is a detection technology developed based on Ohm's law, also known as the electric field characteristic detection method. Its principle is to arrange the electrode matrix in the monitored area, compare and analyze the measured voltage value with the initial voltage value, and then analyze the voltage difference formed between the electrode pairs in the monitored area to obtain the defect development status of the monitored area.

[0004] Compared with conventional nondestructive testing technologies such as the electric field fingerprint method, ultrasonic method, and eddy current sensor, it has the following characteristics: (1) Ability to monitor average corrosion rate, size, depth, location and distribution of pitting and erosion with high accuracy; (2) The temperature adaptability range is wide, and the working environment temperature range is -20℃~500℃; (3) The object being measured is the FSM sensor, which makes the FSM highly reliable. (4) It has long-term monitoring capabilities, which is conducive to analyzing the formation patterns of defects and reducing the occurrence of defects.

[0005] However, the existing electric field fingerprint pipeline corrosion monitoring technology has the following technical defects: 1. The automation level of the monitoring equipment layout process is low. The working environment of the pipeline may be diverse, and the specifications of the pipeline such as diameter and material wall thickness are also different. The fixed position and installation spacing of the electrodes also require the inspection personnel to design, calculate and measure the layout on site. The manual measurement and layout of the electrodes have a certain impact on the detection accuracy, and often there will be a large error in the electrode spacing, which will have a negative impact on the detection results.

[0006] 2. Low detection efficiency of monitoring equipment. The detection range that can be completed by the existing electric field fingerprint technology detection method at one time is often limited by the equipment. Since the existing detection method fixes the electrode on the pipeline to form an electrode matrix, considering the equipment cost, the number of electrodes is limited, so the monitoring range can only cover the local circumferential surface under the electrode on the pipeline, resulting in the inability to comprehensively monitor and assess the risk of a certain important section of the entire pipeline that may face corrosion risks. For pipelines that are several meters or even tens of meters long, the detection efficiency is low.

[0007] 3. The electrode fixing method is harmful to the pipeline. The electrodes of the electric field fingerprint method are usually connected to the pipeline by welding. The detection range is fixed, and the welding method is not suitable for all pipeline surfaces. Some pipeline surfaces are often painted or coated with paint or other coatings. Welding will destroy the protective effect of the coating on the pipeline surface. The electric field fingerprint method can only detect the area covered by the electrode on a section of the pipeline at a time. When there is a new location that needs to be detected, the electrode needs to be re-welded, which causes irreversible damage to the pipeline. The deployment of new monitoring instruments requires huge costs. In addition, welding is a hot work. For special transportation equipment such as oil and gas pipelines or pipelines in special working environments, hot work requires obtaining a hot work permit and following a series of operating procedures, which increases the complexity of the entire detection process.

[0008] Based on the above three points, there is currently no self-propelled electric field fingerprint method adaptive electrode arrangement pipeline non-destructive testing system. How to provide a pipeline corrosion detection device with high automation, high detection efficiency, wide detection range, rich detection scenarios and no damage to the pipeline is a problem that technicians in this field need to solve urgently. Summary of the invention

[0009] In view of the problems of limited detection range, low detection efficiency and inflexible electrode arrangement of traditional electric field fingerprint pipeline monitoring equipment, this application provides a self-propelled electric field fingerprint method adaptive electrode arrangement pipeline non-destructive testing system for detecting and evaluating the status of pipelines. This application uses a swing arm wheel assembly and an adaptive electrode arrangement assembly to change the detection position along the circumference of the pipeline as the track trolley moves, so that the electric field fingerprint method can be used more conveniently and efficiently to determine whether the pipeline is corroded and damaged, and the pipeline corrosion status can be evaluated more accurately and efficiently. This application specifically adopts the following technical solutions.

[0010] Firstly, to achieve the above-mentioned purpose, a self-propelled electric field fingerprint method adaptive electrode arrangement pipeline nondestructive testing system is proposed, which comprises: an annular frame, which is arranged around the outside of the pipeline to be tested, and the annular frame is provided with an annular track and a swing arm wheel assembly, wherein the annular track surrounds the outer circumference of the pipeline to be tested, and the swing arm wheel assembly extends inward and stably supports between the annular frame and the pipeline to be tested, maintaining the distance between the annular track and the outer wall of the pipeline to be tested; an adaptive electrode arrangement assembly, which is slidably mounted on the annular track and has a telescopic freedom along the radial direction of the pipeline to be tested, and in the detection state, the adaptive electrode arrangement assembly extends inward from the annular track to fit the outer wall surface of the pipeline to be tested; during the detection process, the annular frame moves one by one along the axial direction of the pipeline to be tested to each detection position, and drives the adaptive electrode arrangement assembly to run one circle along the annular track at each detection position to detect the electric field information of the outer wall surface of the pipeline to be tested, and outputs the pipeline corrosion state evaluation result by analyzing the electric field information.

[0011] Optionally, a self-propelled electric field fingerprint method adaptive electrode arrangement pipeline non-destructive testing system as described above, wherein, during the process of the annular frame moving axially along the pipeline to be tested, the adaptive electrode arrangement assembly contracts to maintain no direct contact with the outer wall of the pipeline to be tested; when the annular frame reaches each detection position, the adaptive electrode arrangement assembly extends inward from the annular track until it fits the outer wall surface of the pipeline to be tested; during the detection process, the telescopic state of each swing arm wheel assembly always remains consistent.

[0012] Optionally, a self-propelled electric field fingerprint method adaptive electrode arrangement pipeline non-destructive testing system as described above, wherein the annular frame includes: an end ring frame, which is arranged at the front and rear ends of the annular frame, encircling the outer circumference of the pipeline to be tested, and the inner diameter of the end ring frame is larger than the outer diameter of the pipeline to be tested; a support column, which is connected between the front and rear end ring frames along the axial direction of the pipeline to be tested; an annular track, which is fixedly set in the middle of the support column, including two annular tracks arranged front and rear along the axial direction of the pipeline to be tested, the two annular tracks are parallel to each other, and the adaptive electrode arrangement assembly operates synchronously on the two annular tracks.

[0013] Optionally, a self-propelled electric field fingerprint method adaptive electrode arrangement pipeline non-destructive testing system as described above, wherein the support columns include at least 3 columns arranged circumferentially around the pipeline to be tested, and the swing arm wheel assemblies are respectively arranged at the connection positions between the end ring frame and each support column, and each swing arm wheel assembly extends from the end ring frame toward the direction of the circular track.

[0014] Optionally, a self-propelled electric field fingerprint method adaptive electrode arrangement pipeline non-destructive testing system as described above, wherein each of the swing arm wheel assemblies comprises: a swing arm body, which is rotatably mounted on the end of a support column, and a support wheel is also provided at the end of each swing arm body, and the support wheel runs in contact with the outer wall of the pipeline to be tested to drive the annular frame to reach each detection position; a limited angle torque motor, which is fixedly mounted on the end of the support column and is transmission-connected to the rotating shaft of the swing arm body, and is used to drive the swing arm body to deflect toward the pipeline to be tested; a support spring, which is connected between the middle part of the swing arm body and the support column.

[0015] Optionally, a self-propelled electric field fingerprint method adaptive electrode arrangement pipeline non-destructive testing system as described above, wherein the limited angle torque motor has one side of its motor shaft connected to the shaft of the swing arm body through a flat key, and the other side is connected to a spring ratchet as a limit device to prevent the shaft from rotating.

[0016] Optionally, a self-propelled electric field fingerprint method adaptive electrode arrangement pipeline nondestructive testing system as described above, wherein the adaptive electrode arrangement component includes: a track trolley, two of which are arranged on each track, and the driving state of each track trolley is kept synchronous; a telescopic rod, which is arranged on each track trolley and can be extended toward the outer wall of the pipeline to be tested or retracted toward the inner side of the circular track; an elastic electrode arrangement frame, which is fixed at the end of each telescopic rod, has a measuring electrode array and an end angle motor arranged at the end angle position of the electrode array, and in the detection state, the angle of the end angle motor is deflected accordingly so that the extension line of the center line of each electrode in the electrode array passes perpendicularly through the central axis of the pipeline. Before the detection begins, the two ends of the elastic electrode arrangement frame are fixed on the telescopic rod, maintaining a straight natural state, the straight line where the elastic electrode arrangement frame is located is tangent to the circle where the outer wall of the pipeline is located, and as the telescopic rod extends forward, the elastic electrode arrangement frame bends and deforms, and its two ends continue to move forward with the telescopic rod until the detection probe contacts the pipeline wall, and the elastic electrode arrangement frame becomes an arc, thereby adapting to the curvature and radius of the pipeline.

[0017] Optionally, a self-propelled electric field fingerprint method adaptive electrode arrangement pipeline non-destructive testing system as described above, wherein the track trolley is respectively provided with: a driving motor, a driving gear, four driven rollers and a position sensor; wherein the four driven rollers are respectively arranged on the left and right sides of the track trolley, and a copper electrode is arranged at the center of the axle of each driven wheel on the left and right sides, and the copper electrode is closely attached to the copper sheet arranged on the circular track to obtain the current required to drive the track trolley, and the current drives the motor to output torque to drive the driving gear to roll on the inner gear of the circular track; each driven wheel is driven by the driving gear and rolls along the inside of the guide groove on the left and right sides of the circular track; the bottom of the track trolley is connected by a telescopic rod to drive the elastic electrode arrangement frame to reciprocate around the axis of the pipeline above the circumference of the pipeline to be tested to change the measurement area.

[0018] Optionally, a self-propelled electric field fingerprint method adaptive electrode arrangement pipeline non-destructive testing system as described above, wherein each electrode in the measuring electrode array is a telescopic corrosion probe, which has a probe head and a compression spring abutting between the needle head and the inner wall of the packaging structure arranged inside the packaging structure.

[0019] Optionally, a self-propelled electric field fingerprint method adaptive electrode arrangement pipeline non-destructive testing system as described above, wherein each telescopic corrosion probe is connected to an elastic electrode arrangement frame, and is pressed against the outer wall of the pipeline as the elastic electrode arrangement frame bends during testing, and the internal compression spring contracts accordingly to ensure that the probe is adapted to pipelines of different diameters and curvatures, maintaining a tight connection state to achieve conduction of the testing current.

[0020] Optionally, a self-propelled electric field fingerprint method adaptive electrode arrangement pipeline non-destructive testing system as described above, wherein the support column includes four columns evenly arranged around the circumference of the pipeline to be tested, and the end ring frame and the annular guide rail are respectively composed of two semi-annular components, one end of the two semi-annular components is connected by a hinge, and the other end is equipped with a lock for opening or locking. Beneficial Effects

[0021] The self-propelled electric field fingerprint method adaptive electrode arrangement pipeline non-destructive testing system provided by the present application includes: an annular frame arranged around the outside of the pipeline to be tested, and an adaptive electrode arrangement assembly installed on the track in the annular frame. The present application uses the swing arm wheel assembly in the annular frame to maintain the relatively stable positional relationship between the adaptive electrode arrangement assembly and the outer wall of the track to be tested, so that the adaptive electrode arrangement assembly can remain in a state of fitting the surface of the pipe wall to be tested under the detection state. The annular frame is used to drive the adaptive electrode arrangement assembly to automatically move along the pipeline, and it is composed of an annular frame, a swing arm wheel, a limited angular torque motor, a spring ratchet and a support spring, so that the equipment is supported on the pipeline and moves along the pipeline. The adaptive electrode arrangement assembly is connected to the annular track through a telescopic rod and a track trolley, and can change the detection position along the circumference on the pipeline as the track trolley moves. After the adaptive electrode arrangement detection assembly completes a week of detection of the pipeline, the telescopic rod will be retracted, the swing arm wheel will move to one side of the pipeline, the telescopic rod will fall, and the electrode will be close to the outer wall of the pipeline for the next round of detection. The present invention can more conveniently and efficiently use the electric field fingerprint method to determine whether the pipeline is corroded and damaged, and more accurately and efficiently evaluate the corrosion status of the pipeline. Compared with the prior art, the present application has the following advantages: (1) Automated detection: The swing arm wheel, limited angle torque motor, spring ratchet structure, circular track and track trolley structure enable the equipment to achieve a high degree of automation in the detection process. The equipment only needs to be installed and positioned on the pipeline and the command can be input to automatically complete the corrosion detection of the pipeline, thus optimizing the detection process.

[0022] (2) High-efficiency detection: The adaptive electrode arrangement method is adopted to realize automated high-efficiency electrode arrangement and its detection, optimize the detection process, reduce manual participation in the detection process, and improve the accuracy of electrode arrangement. The thickness information of the pipeline section can be detected, thereby judging the corrosion condition of the pipeline.

[0023] (3) Intelligent data analysis: Through advanced data analysis algorithms, the traditional external reference plate temperature compensation method is upgraded to compensate the measurement data based on the temperature compensation difference calculated according to the ambient temperature and the characteristics of the material to be measured, which optimizes the process of frequently arranging reference plates. The pipeline electric field fingerprint information and the initial pipeline electric field fingerprint information are comprehensively analyzed to obtain more accurate and comprehensive pipeline status assessment results, reducing the reliance on manual subjective judgment and improving the reliability and accuracy of the assessment. The pipeline wall thickness model established by regular multiple tests is compared with the pipeline wall thickness model established during the initial measurement, and the part where the wall thickness has changed is located and quantitatively analyzed, so as to comprehensively analyze and evaluate the internal corrosion of the pipeline.

[0024] (4) Wide detection range: This technical solution has a flexible design. The ring frame adopts an adaptive limited angle torque motor, a spring ratchet and a movable swing arm wheel structure. It is suitable for pipes of different types and specifications, can meet the long-distance detection requirements of pipes of different diameters, adapt to various environmental conditions, and can operate and detect normally in different working environments.

[0025] Other features and advantages of the present application will be set forth in the following description, and in part will become apparent from the description, or may be understood by practicing the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The accompanying drawings are used to provide a further understanding of the present application and constitute a part of the specification. Together with the embodiments of the present application, they are used to explain the present application and do not constitute a limitation of the present application. In the accompanying drawings: Figure 1 A flow chart of equipment detection provided by the present invention; Figure 2 It is a two-dimensional structural diagram of the present invention; Figure 3 It is a schematic diagram of an application scenario of the present invention; Figure 4 It is a schematic diagram of the annular frame structure of the present invention; Figure 5 For the present invention Figure 3 A schematic diagram of the swing arm wheel structure shown in the middle A area; Figure 6 For the present invention Figure 3 A schematic diagram of the structure of the adaptive electrode arrangement assembly shown in area B; Figure 7 This is an enlarged structural diagram of the rail trolley in this application; Figure 8 This is a schematic diagram of the structure of the telescopic corrosion probe in this application.

[0027] In the figure, 1 is an annular frame, 11 is an end ring frame, 12 is a support column, 13 is an annular track, 2 is a swing arm wheel assembly, 21 is a limited angle torque motor, 22 is a support spring, 23 is a spring ratchet, 3 is an adaptive electrode arrangement assembly, 31 is a track trolley, 311 is a driving motor, 312 is a driving gear, 313 is a driven roller, 32 is an elastic electrode arrangement frame, and 4 is a pipeline to be tested. DETAILED DESCRIPTION

[0028] In order to make the purpose and technical solution of the embodiment of the present application clearer, the technical solution of the embodiment of the present application will be clearly and completely described in conjunction with the drawings of the embodiment of the present application. Obviously, the described embodiment is a part of the embodiment of the present application, not all of the embodiments. Based on the described embodiment of the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0029] It will be understood by those skilled in the art that, unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as generally understood by those skilled in the art to which this application belongs. It should also be understood that terms such as those defined in common dictionaries should be understood to have meanings consistent with the meanings in the context of the prior art, and will not be interpreted with idealized or overly formal meanings unless defined as herein.

[0030] The meaning of "and / or" described in this application means that the situations where each exists alone or both exist at the same time are included.

[0031] The meaning of "inside" and "outside" in this application refers to the direction pointing to the inner center of the pipeline to be tested as inside, and the opposite direction as outside, relative to the pipeline to be tested itself; it is not a specific limitation on the device mechanism of this application.

[0032] The meaning of "left and right" mentioned in this application refers to that when the user is facing the direction of movement of the rail trolley, the left side of the user is left and the right side of the user is right, rather than a specific limitation on the device mechanism of this application.

[0033] The term “connection” as used in this application may mean a direct connection between components or an indirect connection between components via other components.

[0034] The meaning of "front" and "rear" in this application refers to that when the user is facing the forward direction of the annular frame, the direction along the foreground of the annular frame is the front, and the direction opposite to the front is the rear, rather than being a specific limitation on the device mechanism of this application.

[0035] When inspecting corrosion on pipelines, existing electric field fingerprint detection methods require monitoring equipment such as electrodes, lines, and instruments to be placed around the pipelines for a long time, and require long-term maintenance. This long-term monitoring method and welded electrode fixing method increase the operating cost of the pipeline and also bring additional risks. In addition, the temperature change of the detection environment will cause the resistance and other parameters of the pipeline to be tested to change, thus affecting the detection results. Therefore, the existing method requires the addition of an additional reference board during the detection, on which the electrode is installed for power measurement, so that a more accurate detection result can be obtained by temperature compensation of the measured pipeline electric field data. This process will greatly increase the workload for large-area pipeline detection.

[0036] In order to reduce the equipment operation and maintenance costs and risks based on the advantages of electric field fingerprinting, a self-propelled electric field fingerprinting adaptive electrode layout pipeline non-destructive testing system is proposed, which improves the long-term monitoring of local pipelines within a limited range into a dynamic monitoring of an important long pipeline. The error caused by manual electrode arrangement is reduced, the layout and maintenance costs of the electrode matrix are reduced, the monitorable range is increased, the temperature compensation process is optimized with data algorithms, and the risk of damage to the pipeline caused by the detection electrode is reduced.

[0037] Figure 2 A self-propelled electric field fingerprint method adaptive electrode arrangement pipeline non-destructive testing system according to the present application comprises: An annular frame 1 is arranged around the outside of the pipeline 4 to be tested, and an annular track 13 and a swing arm wheel assembly 2 are arranged on the annular frame 1, wherein the annular track 13 surrounds the outer periphery of the pipeline 4 to be tested, and the swing arm wheel assembly 2 extends inward and is stably supported between the annular frame 1 and the pipeline 4 to be tested, maintaining the distance between the annular track 13 and the outer wall of the pipeline 4 to be tested; The adaptive electrode arrangement assembly 3 is slidably mounted on the annular track 13 and has a degree of freedom of extension and contraction along the radial direction of the pipeline 4 to be tested. In the detection state, the adaptive electrode arrangement assembly 3 extends inward from the annular track 13 to fit the outer wall surface of the pipeline 4 to be tested; During the detection process, the annular frame 1 refers to Figure 1 In the manner shown, the pipeline 4 to be tested is moved axially to each detection position one by one, and the adaptive electrode arrangement assembly 3 is driven to rotate along the circular track 13 for one circle at each detection position to detect the electric field information of the outer wall surface of the pipeline 4 to be tested, and the pipeline corrosion status evaluation result is output by analyzing the electric field information.

[0038] That is to say, this application designs an adaptive measurement structure that can automatically move on pipes of different diameters. The electrode array on the detection component of the adaptive electrode arrangement using the electric field fingerprint method can be attached to the outer wall of the pipe during measurement and lifted up when the device is moving. It can realize the detection of circular rotation around the pipe. The electrode array can be adaptively attached to pipes of different diameters and curvatures. The electric field information at different positions on the pipe can be measured. It can also adapt to the measurement of pipes of different diameters. The electrode arrangement spacing and angle are changed according to the pipe diameter and the corresponding curvature to achieve the best measurement effect. The component analyzes the collected information and evaluates parameters such as the wall thickness of the pipe.

[0039] The control module of the above system is mainly used to realize the fixation and automatic movement of the equipment on pipes of different diameters, and to realize adaptive electrode arrangement and measurement functions.

[0040] The above system can compare the measured electric field fingerprint information with the initial electric field fingerprint information by using data algorithms through data analysis independently set up or integrated in the control module, analyze the electric field information collected by the electrode array, establish the measured pipeline electric field fingerprint information-wall thickness model, evaluate the parameters such as the wall thickness of the pipeline, determine whether corrosion occurs and the type of corrosion, accurately locate the pipeline corrosion position, and output the pipeline status evaluation results.

[0041] In a more preferred implementation, in order to further improve the automation of the detection process, improve the detection efficiency, expand the detection range, and ensure the safety and applicability of the detection method, the system of the present application preferably sets its annular framework to include Figure 4 As shown: end ring frame, support column and annular guide rail. The end ring frame is two annular lightweight high-strength aluminum alloy tubes, four support columns are evenly distributed between the two circular tubes, and two annular tracks are evenly distributed parallel to the two end surfaces and fixed on the four support columns. The end ring frame and the annular guide rail are respectively composed of two semi-annular components, one end is connected by a hinge, and the other end is equipped with a lock that can be opened and locked, which is convenient for installing equipment on the pipeline. A copper sheet is installed in the guide groove on the side of the annular guide rail to power the rail trolley, and the electricity on the copper sheet is connected to the built-in power supply of the detection instrument through the wire on the annular frame. During the axial movement of the annular frame 1 along the pipeline 4 to be tested, the adaptive electrode arrangement component 3 shrinks to maintain no direct contact with the outer wall of the pipeline 4 to be tested; when the annular frame 1 reaches each detection position, the adaptive electrode arrangement component 3 extends inward from the annular track 13 until it fits the outer wall surface of the pipeline 4 to be tested, and during the detection process at each position, the telescopic state of each swing arm wheel component 2 is kept consistent.

[0042] Among them, the adaptive swing arm wheel structure can be specifically configured to include Figure 5As shown: a swing arm, a hub motor, a limited angle torque motor and a spring ratchet, wherein the shaft at one end of the swing arm is coaxially matched with the shaft of the limited angle torque motor, the motor shaft on one side is connected to the rotation center of the end of the swing arm through a flat key, and the spring ratchet on the other side is used as a limit device to prevent the shaft from rotating. The limited angle torque motor and its base are connected to the support column of the ring frame, one end of the support spring is connected to the support column, and the other end is connected to the swing arm. The end of the swing arm has a drive wheel composed of a hub motor, and the four swing arm wheels at one end of the end ring frame are supported on the pipeline to be tested according to two adjacent 90-degree angle arrays. A total of 8 swing arm wheel structures at both ends are supported on the pipeline to be tested, and the drive wheel can move in one direction. The angle between the swing arm and the support column is controlled by controlling the rotation angle of the limited angle torque motor, so as to adapt to the positioning and movement of pipelines of different diameters on pipelines of different diameters.

[0043] The adaptive electrode arrangement measurement component can be specifically configured to include Figure 6 Shown: a track trolley, telescopic rod, electrode arrangement frame, measuring electrode array, and end angle motor, wherein the track trolley has a driving motor, a driving gear, four driven rollers, and a position sensor. The center of the axle of each driven wheel on the left and right sides has a copper electrode that is pressed against the copper sheet on the guide rail to obtain the current required by the component. The driving motor drives the driving gear to roll on the inner gear of the circular track, and the driven wheel rolls in the guide groove on the side of the circular track. The electrode arrangement frame is connected through the telescopic rod to reciprocate around the axis of the pipeline above the circumference to change the measurement position. For details, refer to Figure 7 As shown, in the present application, the track trolley is respectively provided with: a driving motor 311, a driving gear 312, four driven rollers 313 and a position sensor; wherein the four driven rollers are respectively arranged on the left and right sides of the track trolley, and a copper electrode is arranged at the center of the wheel axle of each driven wheel on the left and right sides, and the copper electrode is in close contact with the copper sheet arranged on the circular track 13 to obtain the current required to drive the track trolley, and the current drives the motor to output torque to drive the driving gear to roll on the inner gear of the circular track; each driven wheel is driven by the driving gear, and rolls along the inside of the guide groove on the left and right sides of the circular track; the bottom of the track trolley is connected by a telescopic rod to drive the elastic electrode arrangement frame to reciprocate around the axis of the pipeline above the circumference of the pipeline to be measured to change the measurement area.

[0044] The electrode arrangement frame makes the measuring electrode close to the outer wall of the pipeline during detection. The angle of the end angle motor of the electrode array is controlled so that the extension line of the electrode center line passes vertically through the central axis of the pipeline to achieve the best electrode arrangement angle. The generated electric field information data is stored in the data storage module. The rail trolley supplies power to the drive motor through the internal wires and supplies power to the measuring electrode through the wires on the electrodes.

[0045] The installation position of the adaptive electrode arrangement measurement component is set at Figure 4 On the circular track of the circular frame shown, the detection component and the track trolley are connected by a telescopic rod, which can rotate with the driving gear on the track trolley on the internal gear of the circular track. The telescopic rod allows the detection component to adaptively approach pipes of different diameters, and the electrode arrangement position is changed as the track trolley rotates on the circumference of the pipe to complete the detection of the entire circumference of the pipe.

[0046] Therefore, through the structural design of the track trolley, telescopic rod and electrode arrangement frame, the detection range of the adaptive electric field fingerprint detection component of the present application can be realized by the rotation of the school bus along the track to move the electrode array along the circumferential direction of the pipeline. Each detection can cover a sector-shaped circular surface on the pipeline. Multiple detections can connect the sector-shaped circular surfaces to form the entire circular surface. On this basis, the equipment is moved, and the detection information of each section of the pipeline circumference is spliced ​​together to form electric field information covering the entire length of the pipeline, thereby comprehensively calculating the wall thickness information of the pipeline. In the annular frame 1: the end annular frame 11 is arranged at the front and rear ends of the annular frame 1, embracing the outer circumference of the pipeline 4 to be tested, and the inner diameter of the end annular frame 11 is larger than the outer diameter of the pipeline 4 to be tested; the support column 12 is connected between the front and rear end annular frames 11 along the axial direction of the pipeline 4 to be tested, and generally includes at least 3 columns arranged circumferentially around the pipeline 4 to be tested; the annular track 13 is fixedly arranged in the middle of the support column 12, and generally can be two annular tracks 13 arranged front and back along the axial direction of the pipeline 4 to be tested, and the two annular tracks 13 are parallel to each other to support the front and rear sides of the electrode arrangement frame respectively, and the adaptive electrode arrangement assembly 3 runs synchronously on the two annular tracks 13. The swing arm wheel assembly 2 is respectively arranged at the connection position of the end annular frame 11 and each support column 12, and each swing arm wheel assembly 2 extends from the end annular frame 11 to the annular track 13. The annular frame 1 is maintained in a state close to the coaxial state with the pipeline through the expansion and contraction of the support spring 22, so as to facilitate the adaptive operation of the detection assembly close to the pipeline side wall to realize detection.

[0047] The control platform of the system can change the angle of the swing arm by controlling the rotation angle of the limited angle torque motor according to the detected pipe diameter as input, and realize fixation and movement on pipes of different diameters through the adaptive swing arm wheel structure. The adaptive electric field fingerprint detection component uses the rotation distance of the rail trolley as input to control the start and stop of the swing arm wheel. After reaching the next measurement position, the telescopic rod of the adaptive electric field fingerprint detection component is controlled to make the electrode elastic arrangement frame close to the circumference of the pipe, and the end angle motor of the electrode array is controlled to rotate a certain angle to coincide with the radial line of the pipe, so that the electrode and the pipe are in close contact.

[0048] Reference Figure 5 and Figure 6 As shown, in the present application, the swing arm wheel assembly 2 can generally be configured to consist of a swing arm body, a limited angular torque motor, and a support spring: The swing arm body is rotatably mounted on the end of the support column 12. The end of each swing arm body is also provided with a support wheel. The support wheel is in contact with the outer wall of the pipeline 4 to be tested and runs to drive the annular frame 1 to reach each detection position. The limited angle torque motor 21 is fixedly mounted on the end of the support column 12 and is drivingly connected to the rotating shaft of the swing arm body to drive the swing arm body to deflect toward the pipeline 4 to be tested; A support spring 22 is connected between the middle of the swing arm body and the support column 12. In a preferred embodiment, four support columns 12 can be evenly arranged around the pipe 4 to be tested. The end ring frame and the annular guide rail can be respectively composed of two semi-annular components, one end of the two semi-annular components is connected by a hinge, and the other end is equipped with a lock to open or lock to facilitate the entire swing arm wheel assembly and the swing arm wheel assembly to be disassembled and assembled relative to the pipe wall; The limited angular torque motor 21 has one side of its motor shaft connected to the shaft of the swing arm body via a flat key, and the other side is connected to a spring ratchet 23 as a limit device to prevent the shaft from rotating.

[0049] The end of the swing arm is connected to the probe through an elastic electrode arrangement frame 32 made of elastic material to realize the adaptive electrode arrangement component 3. Figure 6 and Figure 8 Set to: It is driven by a track trolley 31. Two track trolleys can be arranged on each track, respectively connected to the left and right ends of the elastic electrode arrangement frame to adjust the elastic electrode arrangement frame to expand and contract according to the shape of the pipeline side wall. The driving states of the track trolleys 31 are kept synchronous. A telescopic rod, which is arranged on each track trolley 31, can be extended toward the outer wall of the pipeline 4 to be tested or retracted toward the inner side of the circular track 13 to provide support for the elastic electrode arrangement frame 32 so that the frame can fit closely to the surface of the pipeline; The elastic electrode arrangement frame 32 is tough, and the four corners of the frame are respectively fixed to the ends of the telescopic rods. It has a measuring electrode array and an end angle motor arranged at the end angle position of the electrode array. Before the detection begins, the two ends of the elastic electrode arrangement frame are fixed on the telescopic rods to maintain a straight natural state. The straight line where the elastic electrode arrangement frame is located is tangent to the circle where the outer wall of the pipeline is located. As the telescopic rod extends forward, the elastic electrode arrangement frame bends and deforms, and its two ends continue to move forward with the telescopic rod until the detection probe contacts the pipeline wall. The elastic electrode arrangement frame becomes an arc shape, thereby adapting to the curvature and radius of the pipeline. In the detection state, the angle of the end angle motor is deflected accordingly so that the extension line of the center line of each electrode in the electrode array passes perpendicularly through the central axis of the pipeline.

[0050] The measuring electrode array is fixed inside the elastic electrode arrangement frame 32, and each electrode in the array is connected to the data analysis system through a wire. Each electrode uses a telescopic corrosion probe, which is provided with a probe head inside the packaging structure and a compression spring abutting between the probe head and the inner wall of the packaging structure.

[0051] Each telescopic corrosion probe is connected to the elastic electrode arrangement frame 32. During detection, as the elastic electrode arrangement frame 32 bends, it is pressed against the outer wall of the pipeline. The internal compression spring contracts accordingly to ensure that the probe is adapted to pipelines of different diameters and curvatures, maintains a tight connection state, and realizes the conduction of the detection current.

[0052] Therefore, the present application can upgrade the traditional external reference plate temperature compensation method to compensate the measurement data according to the temperature compensation difference calculated based on the ambient temperature and the characteristics of the material to be measured through advanced data analysis algorithms, thereby optimizing the process of frequently arranging reference plates. The data processing unit receives the pipeline electric field information obtained by the electrode detector, splices the local pipeline electric field fingerprint information measured multiple times into the entire pipeline electric field fingerprint information model, calculates the wall thickness information of the corresponding position, and on this basis establishes the overall pipeline electric field fingerprint model and wall thickness model of the corresponding position. The pipeline wall thickness model established by regular multiple detections is compared and analyzed with the pipeline wall thickness model established during the initial measurement, so as to locate and quantitatively analyze the part where the wall thickness changes, and then accurately analyze and evaluate the internal corrosion of the pipeline, and output the pipeline corrosion status evaluation results.

[0053] Specific reference Figure 3 As shown, in one embodiment, the selection and installation of the circular frame in the present application includes: First, the choice of materials: the material of the circular frame and the swing arm should be selected from lightweight and high-strength metals such as aluminum alloy to ensure that the material reduces the weight of the equipment while having sufficient strength, rigidity and durability.

[0054] Secondly, the size and shape are designed. According to the diameters of pipes of different specifications, the diameter of the circular frame of the equipment can be set to 1200 mm, the length of the four supporting columns can be set to 1200 mm, the maximum outer diameter of the circular track is designed to be 1100 mm, and the length of the swing arm is set to 400 mm. Under the action of the motor ratchet, the measurable pipe diameter range can be from 400 mm to 1000 mm, which is highly adaptable.

[0055] The adaptive electrode arrangement device is installed on two circular tracks. The planes where the two circular tracks are located are parallel and 400 mm apart. The distance between the two end circular surfaces is 400 mm respectively. The fixed distance facilitates the adaptive electrode arrangement device to perform data fusion, analysis and evaluation.

[0056] In this implementation case, the selection of ultrasonic flaw detection components includes: First, the choice of materials. The rail trolley and frame are made of lightweight aluminum alloy. The driven wheels of the rail car are made of metal wheels. The detectable range of the adaptive electrode arrangement assembly on the circular track also meets the measurable pipe diameter between 400 mm and 1000 mm with the telescopic range of the telescopic rod. The side frame of the adaptive electrode arrangement device is made of elastic composite materials with a certain rigidity, which can make the electrode arrangement side frame adapt to the pipe surface with different radius curvature when the telescopic rods on both sides press the end electrodes.

[0057] The design of the control system includes: using the diameter of the pipeline as input to control the rotation angle of the limited angle torque motor, thereby indirectly changing the angle of the swing arm and the support column to achieve the function of controlling the adaptive diameter. According to the diameter of the pipeline, the angle of the angle motor at the end of the electrode array is controlled so that the extension line of the electrode center line passes perpendicularly through the central axis of the pipeline to achieve the best electrode layout angle. Using the rotation distance detected by the sensor of the rail trolley as input, the start and stop of the swing arm wheel is controlled. Control the telescopic rod of the adaptive electrode layout assembly.

[0058] In the implementation case, the data analysis stage includes using intelligent algorithms to analyze the electric field fingerprint information and evaluate the health status of the pipeline. It mainly processes the electric field fingerprint information measured by the adaptive electrode arrangement device, including preprocessing the data and extracting features from the data using intelligent algorithms. The pipeline wall thickness model established through regular multiple tests is compared with the pipeline wall thickness model established during the initial test, and the correlation between the pipeline electric field information and the wall thickness information is analyzed, so as to comprehensively analyze and evaluate the internal corrosion of the pipeline, intelligently analyze and judge the current state of the pipeline, and predict possible problems. Finally, the corrosion state of the pipeline and its development process are output.

[0059] In this system, the wires are used to connect the circular track circuit and the built-in power supply of the detection instrument. They also include wires for connecting the measuring electrodes and control lines for controlling the motors of each part. The connector is used to connect the detection equipment with the external measurement equipment for signal transmission and data acquisition.

[0060] In a more preferred specific implementation, the selected adaptive electrode arrangement device can adopt an electric field fingerprint detection electrode array for detecting corrosion and thin-walled materials, wherein the electrode uses a telescopic corrosion probe, and the detection operation requires hardware and software for signal acquisition and analysis, a data storage module and a data analyzer.

[0061] The data analyzer has hardware and software such as drive power supply and control circuit for motor drive devices such as swing arm wheel hub motor, limited angle motor, rail trolley, etc., software and hardware for storing electric field fingerprint information, the function of analyzing electric field fingerprint information with algorithm, operation buttons that can meet the necessary information input and selection functions, and a display that displays pipeline electric field information, wall thickness information, and outputs evaluation of pipeline corrosion location, corrosion type and corrosion degree. It integrates functions such as electrical control, data storage and transmission, data analysis and display.

[0062] Therefore, through the synergy of these components, the adaptive electrode arrangement component can obtain the radial thickness information of the pipeline through the electrode current information, conduct a comprehensive analysis of the information of the entire pipeline, obtain the thickness information of the pipeline section, and thus evaluate the corrosion condition of the pipeline. This improves the detection efficiency, expands the detection range, avoids the potential risks brought by the detection equipment to the production operation, improves the automation of the detection process, helps to timely discover and solve potential problems, and improves the safety and efficiency of pipeline transportation.

[0063] The above is only an implementation method of the present application, and its description is relatively specific and detailed, but it cannot be understood as limiting the scope of the patent of the present application. It should be pointed out that for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present application, which all belong to the protection scope of the present application.

Claims

1. A self-propelled electric field fingerprint method adaptive electrode arrangement pipeline non-destructive testing system, characterized in that: include: An annular frame (1) is arranged around the outside of the pipeline to be tested (4), and an annular track (13) and a swing arm wheel assembly (2) are arranged on the annular frame (1), wherein the annular track (13) surrounds the outer circumference of the pipeline to be tested (4), and the swing arm wheel assembly (2) extends inwardly and is stably supported between the annular frame (1) and the pipeline to be tested (4), so as to maintain a distance between the annular track (13) and the outer wall of the pipeline to be tested (4); An adaptive electrode arrangement assembly (3) which is slidably mounted on the annular track (13) and has a degree of freedom of extension and contraction along the radial direction of the pipeline to be tested (4); in a detection state, the adaptive electrode arrangement assembly (3) extends inward from the annular track (13) to fit the outer wall surface of the pipeline to be tested (4); During the detection process, the annular frame (1) moves along the axial direction of the pipeline to be tested (4) to each detection position one by one, and drives the adaptive electrode arrangement component (3) to rotate along the annular track (13) for one circle at each detection position to detect the electric field information on the outer wall surface of the pipeline to be tested (4), and outputs the pipeline corrosion state evaluation result by analyzing the electric field information.

2. The self-propelled electric field fingerprint method adaptive electrode arrangement pipeline non-destructive testing system according to claim 1 is characterized in that: During the process of the annular frame (1) moving along the axial direction of the pipeline (4) to be tested, the adaptive electrode arrangement assembly (3) contracts to maintain no direct contact with the outer wall of the pipeline (4) to be tested; When the annular frame (1) reaches each detection position, the adaptive electrode arrangement assembly (3) extends inward from the annular track (13) until it fits against the outer wall surface of the pipeline (4) to be detected; During the detection process, the telescopic states of each swing arm wheel assembly (2) remain consistent.

3. The self-propelled electric field fingerprint method adaptive electrode arrangement pipeline non-destructive testing system according to claim 1 is characterized in that: The annular frame (1) comprises: An end ring frame (11) is arranged at the front and rear ends of the annular frame (1) and surrounds the outer circumference of the pipeline to be tested (4), and the inner diameter of the end ring frame (11) is larger than the outer diameter of the pipeline to be tested (4); A support column (12) is connected between the front and rear end ring frames (11) along the axial direction of the pipeline to be tested (4); an annular track (13) is fixedly arranged in the middle of the support column (12), comprising two annular tracks (13) arranged front and rear along the axial direction of the pipeline to be tested (4), the two annular tracks (13) are parallel to each other, and the adaptive electrode arrangement assembly (3) operates synchronously on the two annular tracks (13).

4. The self-propelled electric field fingerprint method adaptive electrode arrangement pipeline non-destructive testing system as claimed in claim 2, characterized in that: The support columns (12) include at least three columns arranged circumferentially around the pipe to be tested (4); the swing arm wheel assemblies (2) are respectively arranged at the connection position between the end ring frame (11) and each support column (12); and each swing arm wheel assembly (2) extends from the end ring frame (11) in the direction of the annular track (13).

5. The self-propelled electric field fingerprint method adaptive electrode arrangement pipeline non-destructive testing system as claimed in claim 4, characterized in that: Each of the swing arm wheel assemblies (2) comprises: A swing arm body, which is rotatably mounted on the end of a support column (12), and a support wheel is provided at the end of each swing arm body, the support wheel being adapted to run in contact with the outer wall of the pipeline (4) to be tested so as to drive the annular frame (1) to reach each testing position; A limited angle torque motor (21) is fixedly mounted on the end of the support column (12) and is drivingly connected to the rotating shaft of the swing arm body, and is used to drive the swing arm body to deflect toward the pipeline (4) to be tested. A support spring (22) is connected between the middle portion of the swing arm body and the support column (12).

6. The self-propelled electric field fingerprint method adaptive electrode arrangement pipeline non-destructive testing system according to claim 5 is characterized in that: The limited angular torque motor (21) has one side of its motor shaft connected to the shaft of the swing arm body via a flat key, and the other side connected to a spring ratchet (23) as a limit device to prevent the shaft from rotating.

7. The self-propelled electric field fingerprint method adaptive electrode arrangement pipeline non-destructive testing system according to claims 1-6, characterized in that: The adaptive electrode arrangement component (3) comprises: Two rail trolleys (31) are arranged on each track, and the driving states of the rail trolleys (31) are kept synchronous; A telescopic rod, which is arranged on each track trolley (31) and can be extended toward the outer wall of the pipeline (4) to be tested or retracted toward the inner side of the circular track (13); The elastic electrode arrangement frame (32) is fixed to the end of each telescopic rod and has a measuring electrode array and an end angle motor arranged at the end angle position of the electrode array. In the detection state, the angle of the end angle motor is deflected accordingly so that the extension line of the center line of each electrode in the electrode array passes perpendicularly through the central axis of the pipeline.

8. The self-propelled electric field fingerprint method adaptive electrode arrangement pipeline non-destructive testing system as described in claims 1-7 is characterized in that: The rail trolleys are respectively provided with: a driving motor (311), a driving gear (312), four driven rollers (313) and a position sensor; Among them, four driven rollers are arranged on the left and right sides of the track trolley respectively, and a copper electrode is arranged at the center of the wheel axle of each driven wheel on the left and right sides. The copper electrode is closely attached to the copper sheet arranged on the circular track (13) to obtain the current required to drive the track trolley. The current drives the motor to output torque to drive the driving gear to roll on the inner gear of the circular track; Each driven wheel is driven by the driving gear and rolls along the guide grooves on the left and right sides of the annular track; The bottom of the track trolley is connected by a telescopic rod to drive the elastic electrode arrangement frame to reciprocate around the axis of the pipeline above the circumference of the pipeline to be measured to change the measurement area.

9. The self-propelled electric field fingerprint method adaptive electrode arrangement pipeline non-destructive testing system according to claim 6, characterized in that: Each electrode in the measuring electrode array is a telescopic corrosion probe, which is provided with a probe head inside the packaging structure and a compression spring abutting between the probe head and the inner wall of the packaging structure.

10. The self-propelled electric field fingerprint method adaptive electrode arrangement pipeline non-destructive testing system according to claim 4, characterized in that: The support column (12) comprises four columns evenly arranged around the circumference of the pipe to be tested (4), and the end ring frame and the annular guide rail are respectively composed of two semi-annular components, one end of the two semi-annular components is connected by a hinge, and the other end is equipped with a lock for opening or locking.

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