Non-destructive testing method and related device for concrete poles with high detection accuracy

Abstract

The embodiments of the present application disclose a non-destructive testing method and related device for concrete poles with high detection accuracy. For the non-destructive testing method of concrete poles with high detection accuracy, first, the non-destructive testing device for concrete poles is turned on to obtain the initial detection result of the induction coil; then, based on the initial detection result, zero-position calibration is performed on the induction coil. Performing zero-position calibration based on the initial detection result can eliminate the influence of the self-structural components of the non-destructive testing device for concrete poles on the detection result; finally, the change in the inductance value of the induction coil can be measured to reflect the parameter information of the conductor specimen or whether there are defects. By adopting this non-destructive testing method, the influence of the self-structural components of the non-destructive testing device for concrete poles on the detection result can be reduced, the detection accuracy can be improved, and further, the non-destructive testing device for concrete poles can increase the detection depth and can be applied to the detection of complex steel bar structures.

Description

Technical Field

[0001] The embodiments of the present application relate to the technical field of concrete pole detection, and in particular, to a non-destructive detection method and related device for concrete poles with high detection accuracy. Background Art

[0002] As an important part of the power grid support structure, concrete poles belong to low-value equipment materials among many grid-connected materials. The technical threshold is low and there are many suppliers. Due to the complex models and large procurement quantities (counting in millions), the quality inspection and supervision of grid-connected circular concrete poles face a severe situation with numerous points, large quantities, and wide coverage. In the current production process of concrete poles, there are some manufacturers who use steel bars with diameters smaller than the designed size and spliced together to pass off inferior products as good ones, or due to the limitations of production process levels, the state parameters such as the diameter of steel bars, the thickness of the protective layer, and the spacing inside the concrete poles do not meet the national design standards. When the steel bar structure is seriously unreasonable, the various performances of the concrete poles will be greatly reduced, causing them to have structural failures far before the designed service life, and then collapsing, which will affect the stable operation of the power system and even pose a danger to people's lives and safety. Compared with the infrared detection method, the electromagnetic method is convenient to operate and has high detection accuracy; compared with the ray detection method, it is harmless to the human body and the environment. In addition, since the magnetic permeability and conductivity of concrete are close to those of air, electromagnetic detection inside it will not cause interference. However, the detection depth of the electromagnetic detection method in traditional technologies is average; it is not easy to detect complex steel bar structures. Summary of the Invention

[0003] The present invention aims to solve at least one of the technical problems existing in the prior art or related technologies.

[0004] To this end, the first aspect of the present invention provides a non-destructive detection method for concrete poles with high detection accuracy.

[0005] The second aspect of the present invention provides a computer-readable storage medium.

[0006] The third aspect of the present invention provides a control device.

[0007] In view of this, according to the first aspect of the embodiments of the present application, a non-destructive detection method for concrete poles with high detection accuracy is proposed, which is characterized in that it is applied to a non-destructive detection device for concrete poles. The non-destructive detection device for concrete poles includes a magnetic field excitation source and an induction coil. The non-destructive detection method for concrete poles with high detection accuracy includes:

[0008] Turn on the non-destructive detection device for concrete poles, and obtain the initial detection result of the induction coil when there is no steel bar state on the periphery of the non-destructive detection device for concrete poles;

[0009] Based on the initial detection result, perform zero-position calibration on the induction coil;

[0010] Drive the non-destructive testing device for concrete poles close to the concrete pole, and turn on the magnetic field excitation source to output a pulsed magnetic field;

[0011] The induction coil outputs an equivalent impedance value based on the zero-position calibration;

[0012] Based on the equivalent impedance value, determine the steel bar parameter information inside the concrete pole.

[0013] In a feasible implementation manner, the step that the induction coil outputs an equivalent impedance value based on the zero-position calibration includes:

[0014] Control the non-destructive testing device for concrete poles to move on the concrete pole;

[0015] Obtain the change trend of the detection result output by the induction coil based on the zero-position calibration;

[0016] When the detection result is at the peak, perform steel bar positioning and use this peak as the equivalent impedance value.

[0017] In a feasible implementation manner, the non-destructive testing method for concrete poles with high detection accuracy further includes:

[0018] In response to the waveform scanning instruction, control the non-destructive testing device for concrete poles to move on the concrete pole along a preset direction;

[0019] The induction coil outputs a waveform change curve of the equivalent impedance value based on the zero-position calibration;

[0020] Based on the waveform change curve, determine the position and density of the steel bars.

[0021] In a feasible implementation manner, the step that based on the equivalent impedance value, determine the steel bar parameter information inside the concrete pole includes:

[0022] Based on the steel bar position information, concrete thickness information, steel bar size information of the concrete pole with known steel bar parameter information and the standard equivalent impedance value corresponding to the steel bar parameter information, construct a database;

[0023] Based on the equivalent impedance value, perform comparison in the database, and obtain the steel bar parameter information that matches the equivalent impedance value.

[0024] In a feasible implementation manner, the step that based on the equivalent impedance value, perform comparison in the database, and obtain the steel bar parameter information that matches the equivalent impedance value includes:

[0025] Obtain the upper limit standard equivalent impedance value and the lower limit standard equivalent impedance value corresponding to the equivalent impedance value in the database;

[0026] Output a first matching result based on the upper limit standard equivalent impedance value;

[0027] Output a second matching result based on the lower limit standard equivalent impedance value;

[0028] Determine the qualified state of the distribution of the steel bars of the concrete pole based on the first matching result and the second matching result.

[0029] In a feasible implementation manner, the upper limit standard equivalent impedance value is the standard equivalent impedance value in the database that is closest to the equivalent impedance value and is greater than or equal to the equivalent impedance value; the lower limit standard equivalent impedance value is the standard equivalent impedance value in the database that is closest to the equivalent impedance value and is less than or equal to the equivalent impedance value.

[0030] In a feasible implementation manner, the step of determining the qualified state of the distribution of the steel bars of the concrete pole based on the first matching result and the second matching result includes:

[0031] Determine the important level of the concrete pole;

[0032] When the important level is level one, if both the first matching result and the second matching result meet the qualified requirements, it is determined that the distribution of the steel bars of the concrete pole is qualified;

[0033] When the important level is level two, if at least one of the first matching result and the second matching result meets the qualified requirements, it is determined that the distribution of the steel bars of the concrete pole is qualified.

[0034] In a feasible implementation manner, there are multiple induction coils, and the step of the induction coils outputting the equivalent impedance value based on the zero position calibration includes:

[0035] Obtain the equivalent impedance value of each induction coil based on the zero position calibration;

[0036] Take the average value of the equivalent impedance values of the multiple induction coils as the output result.

[0037] According to the second aspect of the embodiments of the present application, a computer-readable storage medium is provided,

[0038] The computer-readable storage medium stores a computer program, which implements the high-precision detection non-destructive testing method for concrete poles as described in any of the above technical solutions.

[0039] According to the third aspect of the embodiments of the present application, a control device is provided, including:

[0040] A memory for storing a computer program;

[0041] A processor for executing the computer program;

[0042] Wherein, when the processor executes the computer program, the non-destructive testing method for concrete poles with high detection accuracy as described in any of the above technical solutions is implemented.

[0043] Compared with the prior art, the present invention has at least the following beneficial effects:

[0044] The non-destructive testing method for concrete poles with high detection accuracy provided by the embodiment of the present application first turns on the non-destructive testing device for concrete poles to obtain the initial detection result of the induction coil when there are no metal products around the non-destructive testing device for concrete poles. The detection result in this case is caused by the magnetic field excitation source and the inevitable metal parts on the non-destructive testing device for concrete poles. Then, based on the initial detection result, zero position calibration is performed on the induction coil. Performing zero position calibration based on the initial detection result can eliminate the influence of the self-structural parts of the non-destructive testing device for concrete poles on the detection result. Finally, when the non-destructive testing device for concrete poles is close to the concrete pole, the magnetic field excitation source is turned on to output a pulsed magnetic field. When the pulsed magnetic field encounters a metal conductor, an alternating eddy current in the opposite direction to the coil excitation current will be generated on the metal surface due to the continuous cutting of the alternating magnetic field. The alternating eddy current on the metal surface can be equivalent to passing an alternating current through the coil, so an instantaneous alternating magnetic field opposite to the magnetic field direction generated by the magnetic field excitation source is further generated. The instantaneous alternating magnetic field acts on the coil again through electromagnetic induction to change the coil impedance. The magnitude of the eddy current on the metal surface depends on the relevant electromagnetic characteristic parameters such as the magnetic permeability and conductivity of the measured metal, as well as physical parameters such as shape and size, and is also affected by factors such as the distance between the excitation coil and the metal surface and the frequency of the excitation current. Due to the influence of the magnetic field excited by the eddy current, the equivalent impedance value of the induction coil changes. Therefore, the parameter information of the conductor specimen or the presence of defects can be reflected by measuring the change in the impedance value of the induction coil. Using this non-destructive testing method, compared with other testing methods, it is harmless to the human body and the environment. In addition, it can reduce the influence of the self-structural parts of the non-destructive testing device for concrete poles on the detection result, improve the detection accuracy, and further enable the non-destructive testing device for concrete poles to increase the detection depth and be applicable to the detection of complex steel bar structures. Description of the Drawings

[0045] Upon reading the following detailed description of the preferred embodiments, various other advantages and benefits will become apparent to those of ordinary skill in the art. The drawings are only for the purpose of showing the preferred embodiments and are not considered to be a limitation of the present application. Moreover, throughout the drawings, the same reference numerals are used to represent the same components. In the drawings:

[0046] Figure 1 Schematic step flow chart of a high-precision non-destructive testing method for concrete poles provided by the present application;

[0047] Figure 2 Schematic structural diagram of a non-destructive testing device for concrete poles provided by the present application;

[0048] Figure 3 Schematic structural diagram of the second housing part of a non-destructive testing device for concrete poles provided by the present application;

[0049] Figure 4 Schematic structural diagram of the second housing part of a non-destructive testing device for concrete poles provided by the present application from another angle;

[0050] Figure 5 Schematic structural diagram of the second housing part of a non-destructive testing device for concrete poles provided by the present application from yet another angle;

[0051] Figure 6 Schematic structural diagram of the first housing part of a non-destructive testing device for concrete poles provided by the present application;

[0052] Figure 7 Schematic structural diagram of the second housing part of a non-destructive testing device for concrete poles provided by the present application from another angle;

[0053] Figure 8 Schematic diagram of the magnetic field distribution when a non-destructive testing device for concrete poles provided by the present application is in use;

[0054] Figures 9a to 9c Diagram of the state of use of a non-destructive testing device for concrete poles provided by the present application during the process of positioning steel bars.

[0055] Among them, Figures 2 to 9c The corresponding relationship between the reference numerals and the component names in the figure is:

[0056] 110 housing assembly, 120 detection assembly, 130 auxiliary wheel assembly;

[0057] 111 First housing, 112 Second housing, 113 Buckle, 114 Positioning post, 115 Holding part, 121 Magnetic field excitation source, 122 Induction coil, 123 Main control board, 131 Measuring wheel, 132 Bracket, 133 Support wheel. Detailed implementation

[0058] To better understand the above technical solutions, the technical solutions of the embodiments of the present application will be described in detail below through the accompanying drawings and specific embodiments. It should be understood that the specific features in the embodiments of the present application and the embodiments are detailed descriptions of the technical solutions of the embodiments of the present application, rather than limitations on the technical solutions of the present application. Without conflict, the technical features in the embodiments of the present application and the embodiments can be combined with each other.

[0059] As Figure 1 shown, a non-destructive testing method for concrete poles with high detection accuracy is proposed according to the first aspect of the embodiments of the present application, which is applied to a non-destructive testing device for concrete poles. The non-destructive testing device for concrete poles includes a magnetic field excitation source and an induction coil. The non-destructive testing method for concrete poles with high detection accuracy includes:

[0060] Step 101: Turn on the non-destructive testing device for concrete poles and obtain the initial detection result of the induction coil when there is no steel bar on the periphery of the non-destructive testing device for concrete poles.

[0061] Step 102: Based on the initial detection result, perform zero position calibration on the induction coil.

[0062] Step 103: Drive the non-destructive testing device for concrete poles close to the concrete pole and turn on the magnetic field excitation source to output a pulsed magnetic field.

[0063] Step 104: The induction coil outputs an equivalent impedance value based on the zero position calibration.

[0064] Step 105: Based on the equivalent impedance value, determine the steel bar parameter information in the concrete pole.

[0065] The non-destructive testing method for concrete poles with high detection accuracy provided by the embodiments of the present application first turns on the non-destructive testing device for concrete poles when there are no metal products around the device, and obtains the initial detection result of the induction coil. The detection result in this case is generated by the magnetic field excitation source and the inevitable metal parts on the non-destructive testing device for concrete poles. Then, based on the initial detection result, zero-position calibration is performed on the induction coil. Performing zero-position calibration based on the initial detection result can eliminate the influence of the structural components of the non-destructive testing device for concrete poles on the detection result. Finally, when the non-destructive testing device for concrete poles is close to the concrete pole, the magnetic field excitation source is turned on to output a pulsed magnetic field. When the alternating magnetic field of the pulsed magnetic field encounters a metal conductor, an alternating eddy current in the opposite direction to the coil excitation current will be generated on the metal surface due to the continuous cutting of the alternating magnetic field. The alternating eddy current on the metal surface can be equivalent to passing an alternating current through the coil, so an instantaneous alternating magnetic field opposite to the direction of the magnetic field generated by the magnetic field excitation source is further generated. The instantaneous alternating magnetic field acts on the coil again through electromagnetic induction and changes the impedance of the coil. The magnitude of the eddy current on the metal surface depends on the relevant electromagnetic characteristic parameters such as the magnetic permeability and conductivity of the measured metal, as well as physical parameters such as shape and size, and is also affected by factors such as the distance between the excitation coil and the metal surface and the frequency of the excitation current. Due to the influence of the magnetic field excited by the eddy current, the equivalent impedance value of the induction coil changes. Therefore, the parameter information of the conductor specimen or the presence of defects can be reflected by measuring the change in the impedance value of the induction coil. Using this non-destructive testing method, compared with other testing methods, it is harmless to the human body and the environment. In addition, it can reduce the influence of the structural components of the non-destructive testing device for concrete poles on the detection result, improve the detection accuracy, and further enable the non-destructive testing device for concrete poles to increase the detection depth and be applicable to the detection of complex steel bar structures.

[0066] In a feasible implementation manner, the steps for the induction coil to output an equivalent impedance value based on zero-position calibration include: controlling the non-destructive testing device for concrete poles to move on the concrete pole; obtaining the change trend of the detection result output by the induction coil based on zero-position calibration; and when the detection result is at a peak, performing steel bar positioning and using this peak as the equivalent impedance value.

[0067] In this technical solution, the steps for the induction coil to output an equivalent impedance value based on zero-position calibration are further improved. After the non-destructive testing device for concrete poles is attached to the concrete pole, first drive the non-destructive testing device for concrete poles to move, and then observe the change trend of the detection result. When the detection result is at a peak, it indicates that there is a steel bar directly below the detection coil. In this case, the positioning of one steel bar can be completed, and the detection result of the induction coil can be used as the equivalent impedance value, which can further improve the detection accuracy.

[0068] In a feasible implementation, the non-destructive testing method for high-precision concrete poles further includes: in response to a waveform scanning instruction, controlling the non-destructive testing device of the concrete pole to move along a preset direction on the concrete pole; the induction coil outputs a waveform change curve of the equivalent impedance value based on zero position calibration; based on the waveform change curve, determine the position and density of the steel bars.

[0069] In this technical solution, the concrete pole can also be detected by waveform scanning. By driving the non-destructive testing device of the concrete pole to move along a preset direction on the concrete pole, in this case, since multiple steel bars are arranged in the concrete pole, the output result of the induction coil is in a waveform distribution. The denser the waveform, the denser the steel bar distribution. On the contrary, the sparser the waveform, the larger the steel bar spacing. Based on this, the position and density of the steel bars can be determined at one time, which can improve the detection progress.

[0070] In a feasible implementation, the steps of determining the steel bar parameter information in the concrete pole based on the equivalent impedance value include: constructing a database based on the steel bar position information, concrete thickness information, and steel bar size information of the concrete pole with known steel bar parameter information and the standard equivalent impedance value corresponding to the steel bar parameter information; comparing based on the equivalent impedance value in the database to obtain the steel bar parameter information matching the equivalent impedance value.

[0071] In this technical solution, a specific method for determining the steel bar parameter information is further provided. First, a database can be constructed based on the steel bar position information, concrete thickness information, and steel bar size information of the concrete pole with known steel bar parameter information and the standard equivalent impedance value corresponding to the steel bar parameter information. Then, the steel bar parameter information corresponding to the detected equivalent impedance value can be determined by data comparison, which can improve the detection accuracy and detection efficiency.

[0072] It can be understood that an intelligent algorithm can also be carried, and the steel bar parameter information can be obtained by equivalent calculation of the equivalent impedance value through the algorithm.

[0073] In a feasible implementation, the steps of comparing based on the equivalent impedance value in the database to obtain the steel bar parameter information matching the equivalent impedance value include: obtaining the upper limit standard equivalent impedance value and the lower limit standard equivalent impedance value corresponding to the equivalent impedance value in the database; outputting a first matching result based on the upper limit standard equivalent impedance value; outputting a second matching result based on the lower limit standard equivalent impedance value; based on the first matching result and the second matching result, determine the qualified state of the distribution of the steel bars in the concrete pole.

[0074] In this technical solution, considering that the sample data in the database is always limited, there may be no sample value in the database that is the same as the equivalent impedance value in this case. In this case, the upper limit standard equivalent impedance value and the lower limit standard equivalent impedance value that are closest to the equivalent impedance value can be obtained. Then, based on the first matching result and the second matching result of the upper limit standard equivalent impedance value and the lower limit standard equivalent impedance value respectively, determining the qualified state of the distribution of the steel bars of the concrete pole can improve the detection efficiency.

[0075] In a feasible implementation manner, the upper limit standard equivalent impedance value is the standard equivalent impedance value in the database that is closest to the equivalent impedance value and is greater than or equal to the equivalent impedance value; the lower limit standard equivalent impedance value is the standard equivalent impedance value in the database that is closest to the equivalent impedance value and is less than or equal to the equivalent impedance value. With such a setting, it is more convenient to screen the upper limit standard equivalent impedance value and the lower limit standard equivalent impedance value.

[0076] In a feasible implementation manner, the steps of determining the qualified state of the distribution of the steel bars of the concrete pole based on the first matching result and the second matching result include: determining the important level of the concrete pole; when the important level is level one, when both the first matching result and the second matching result meet the qualified requirements, it is determined that the distribution of the steel bars of the concrete pole is qualified; when the important level is level two, when at least one of the first matching result and the second matching result meets the qualified requirements, it is determined that the distribution of the steel bars of the concrete pole is qualified.

[0077] In this technical solution, for the level one concrete pole with a higher important level, the first matching result and the second matching result need to meet the requirements simultaneously; while for the level two concrete pole with a lower important level, only one of the first matching result and the second matching result needs to meet the requirements for the qualified steel bar distribution, which can improve the detection efficiency.

[0078] In a feasible implementation manner, there are multiple induction coils. The steps for the induction coils to output the equivalent impedance value based on zero position calibration include: obtaining the equivalent impedance value of each induction coil based on zero position calibration; taking the average value of the equivalent impedance values of the multiple induction coils as the output result. By setting multiple induction coils, the detection accuracy can be further improved.

[0079] When there are multiple induction coils, some of the multiple induction coils are peripheral induction coils, and the other part is a central induction coil. The connection line of the arrangement positions of the multiple peripheral induction coils is a regular polygon, and the central induction coil is arranged at the center of the regular polygon. During the detection process, the method for positioning the steel bars can further include the following steps:

[0080] Step 201: Obtain the detection result of each induction coil;

[0081] Step 202: Move the non-destructive testing device for concrete poles until the test results of two adjacent peripheral induction coils in the first direction are the same and the test result of the central induction coil is at a peak value.

[0082] Step 203: Rotate the non-destructive testing device for concrete poles until the test results of two adjacent peripheral induction coils in the second direction are the same.

[0083] Step 204: Based on the current attitude of the rotated non-destructive testing device for concrete poles, determine the orientation of the steel bars inside the concrete pole.

[0084] The detection method provided by the embodiment of the present application is applied to the non-destructive testing device for concrete poles in any of the above technical solutions. Therefore, this detection method has all the beneficial effects of the non-destructive testing device for concrete poles in the above technical solutions.

[0085] The detection method provided by the embodiment of the present application first sets the non-destructive testing device for concrete poles on the concrete pole, and then obtains the test results of each induction coil. Further adjust the setting position of the non-destructive testing device for concrete poles so that the test results of two adjacent peripheral induction coils in the first direction are the same and the test result of the central induction coil is at a peak value. In this case, it means that the steel bar is directly below the central induction coil. Then rotate the non-destructive testing device for concrete poles until the test results of two adjacent peripheral induction coils in the second direction are the same. In this case, it means that the axial direction of the steel bar is the same as the second direction. Then, based on the test results of the peripheral induction coils and the central induction coil, determine the information of the steel bar, which can make the detection of the steel bar more accurate.

[0086] In a feasible implementation manner, the detection method further includes: Step 206: In the current attitude, based on the test results of all induction coils, determine the equivalent impedance values of all induction coils, and based on the equivalent impedance values, determine the position information and diameter information of the steel bars. With such a setting, when the steel bar is directly below the central induction coil and the axial direction of the steel bar is parallel to the second direction, based on the test results of all induction coils, determine the equivalent impedance values of all induction coils, and based on the equivalent impedance values, determine the position information and diameter information of the steel bars, which can make the determination of the steel bar information more accurate.

[0087] In a feasible implementation manner, the step of determining the equivalent impedance values of all induction coils based on the test results of all induction coils includes: obtaining the test results of all induction coils; performing frequency conversion on the test results based on Fourier transform to obtain a primary noise-reduced test result; performing secondary noise reduction on the primary noise-reduced test result based on the wavelet denoising algorithm to obtain a secondary noise-reduced test result; and determining the equivalent impedance values of all induction coils based on the secondary noise-reduced test result.

[0088] In this technical solution, a method for reducing the noise of data is further provided. Based on the Fourier transform and the wavelet denoising algorithm, it can improve the accuracy and reliability of signal processing, ensuring the accuracy and repeatability of the detection results.

[0089] In some examples, the wavelet denoising algorithm may include at least one of the Haar wavelet algorithm, the Daubechies (dbN) wavelet algorithm, the Mexican Hat (mexh) wavelet algorithm, the Morlet wavelet algorithm, the Meyer wavelet, the Symlet (sym N) wavelet algorithm, the Coiflet (Coif N) wavelet algorithm, and the Biorthogonal (biorNr.Nd) wavelet algorithm.

[0090] In a feasible implementation manner, when there are four peripheral induction coils, the first direction is the diagonal direction of a regular polygon, and the second direction is the right-angle side direction. Such a setting facilitates improving the detection efficiency.

[0091] In a feasible implementation manner, the detection method further includes: continuing to move the non-destructive testing device for concrete poles, and repeating steps 201 to 204 until the non-destructive testing device for concrete poles rotates one week circumferentially around the concrete pole to locate all the steel bars inside the concrete pole. By setting it like this, the information of each steel bar inside the concrete pole can be detected, and the overall detection accuracy can be guaranteed.

[0092] Embodiment

[0093] According to the first aspect of the embodiments of the present application, a non-destructive testing device for concrete poles is proposed, including: a detection component, the detection component includes a magnetic field excitation source and an induction coil, the magnetic field excitation source is used to emit a pulsed magnetic field, and an electric current will be generated when the pulsed magnetic field acts on a metal, and the induction coil is used to detect the magnetic field generated by the electric current; wherein, there are 5 induction coils, 4 of the 5 induction coils are peripheral induction coils, and the other one is a central induction coil. The connection lines of the arrangement positions of the 4 peripheral induction coils are a square, and the central induction coil is arranged at the center of the square.

[0094] In this embodiment, considering that the distance between the steel bar and the induction coil directly affects the magnitude of the detection value of the induction coil, and when the steel bar is directly below the induction coil, the distance between the two is the minimum and the detection value reaches the maximum. Therefore, the position of the steel bar inside the concrete can be judged according to whether the induction coil is at the detection peak value. To achieve the rapid positioning of the main steel bars, a magnetic detection array is designed and utilized. Through the comparative analysis of the magnetic field intensity values at different spatial positions obtained by detection, a detection method that can directly judge the center position and trend of the main steel bars is established.

[0095] Such asFigures 9a to 9c as shown, where Figures 9a to 9c the connection direction between ① and ② is the second direction, and the connection between ① and ③ or the connection between ② and ④ can be the first direction. The magnetic detection array is directly below a cylindrical permanent magnet with a diameter of 35 mm and a height of 19 mm, and the distance between them is fixed at 15 mm. The magnetic detection array consists of five induction coils numbered ① to ⑤, and their positions are strictly symmetric. Among them, the induction coils numbered ① to ④ are respectively located at the four corners of a square with a side length of 24 mm, and the ⑤th induction coil is located at the center of the square.

[0096] The 5 induction coils collect the magnetic field intensity values at 5 different spatial positions at the same time. Based on the comparison of the magnetic field intensity magnitudes at the 4 symmetric corners, the center position and angle deflection of the main reinforcement can be judged. The center position of the main reinforcement is defined as the position corresponding to the center axis of the reinforcement on the surface of the concrete pole. The basis for successful judgment is that the center of the detection device is directly above the center axis of the main reinforcement. When the center of the magnetic detection array is not directly above the main reinforcement, the magnetization effect of the reinforcement is more obvious, and it can be known that the magnetic field intensity detection values of the ① and ② induction coils close to the main reinforcement side are larger; when the center of the magnetic detection array is directly above the main reinforcement, at this time, regardless of whether there is deflection, the distances between the two groups of diagonal induction coils, namely ① and ③, ② and ④, and the main reinforcement are the same, and the magnetic field intensities measured diagonally are also the same. Assume that the detection values of the induction coils numbered ①, ②, ③, and ④ are S1, S2, S3, and S4 respectively. At this time, the values of S1 to S4 are as shown in formula (1).

[0097]

[0098] According to this characteristic, let Y 1 = S 1 + S 2 , Y 2 = S 3 + S 4 , the following judgment basis for the center position of the main reinforcement can be obtained as shown in formula (2).

[0099]

[0100] According to the judgment result, slowly move the detection device in the direction of deviation of the main reinforcement and keep the distance from the surface of the concrete pole unchanged until the induction coil detection value obtains Y 1 = Y 2 , then it can be judged that the main reinforcement is directly below the center of the induction coil at this time, and the center position of the main reinforcement is determined.

[0101] On the premise of completing the positioning of the main reinforcement, the magnetic detection array can be used to further realize the judgment of the deflection direction of the main reinforcement and the measurement of the deflection angle.

[0102] The center of the induction coil is directly above the central axis of the steel bar, and there is a deflection angle θ (θ≠0). As can be seen from Equation (2), the two sets of detection values at the diagonals are equal respectively, and the positions of the No. ① and ③ induction coils with the main steel bars being closer have a larger spatial magnetic field. Therefore, the relationship of the detection values can be obtained as shown in Equation (3).

[0103] S 1 =S 3 =a>S 2 =S 4 =b (3)

[0104] When the main steel bar is parallel to the vertical direction without deflection, the magnetization effect on the positions of the No. ① to ① induction coils is the same, and the detected magnetic field intensity values are also the same. Therefore, let Y 3 =S 1 +S 3 , Y 4 =S 2 +S 4 , then the judgment basis for the deflection direction of the main steel bar can be obtained as shown in Equation (4).

[0105]

[0106] According to the judgment result, rotate the detection device slowly along its center towards the deflection direction of the main steel bar until Y 3 =Y 4 , that is, it can be determined that the deflection angle of the main steel bar at this time is the rotation angle of the detection device. According to the above inference result, it can be obtained that under ideal conditions, when and only when Y 1 =Y 2 =Y 3 =Y 4 , the main steel bar is exactly directly below the detection device and has no deflection.

[0107] As Figures 2 to 9c shown, in some examples, the non-destructive testing device for concrete poles may include:

[0108] A detection component 120, the detection component 120 includes a magnetic field excitation source 121 and induction coils 122. The magnetic field excitation source 121 is used to emit a pulsed magnetic field. When the pulsed magnetic field acts on the metal, a current will be generated. The induction coils 122 are used to detect the magnetic field generated by the current; among them, there are multiple induction coils 122. Some of the induction coils 122 among the multiple induction coils 122 are peripheral induction coils 122, and the other part is the central induction coil 122. The connection lines of the arrangement positions of the multiple peripheral induction coils 122 are regular polygons, and the central induction coil 122 is arranged at the center of the regular polygon.

[0109] The non-destructive testing device for concrete poles provided by the embodiments of the present application includes a detection component 120. The detection component 120 includes a magnetic field excitation source 121 and induction coils 122. Based on this, during use, when the non-destructive testing device for concrete poles is carried close to the concrete pole, the magnetic field excitation source 121 is used to emit a pulsed magnetic field. When the alternating magnetic field encounters a metal conductor, eddy currents in the opposite direction to the coil excitation current will be generated on the metal surface due to the continuous cutting of the alternating magnetic field. The alternating eddy currents on the metal surface can be equivalent to passing an alternating current through the coil, and thus an instantaneous alternating magnetic field opposite to the magnetic field direction generated by the magnetic field excitation source 121 is further generated. The instantaneous alternating magnetic field acts on the coil again through electromagnetic induction and changes the impedance of the coil. The magnitude of the eddy currents on the metal surface depends on the relevant electromagnetic characteristic parameters such as the magnetic permeability and conductivity of the measured metal, as well as physical parameters such as shape and size, and is also affected by factors such as the distance between the excitation coil and the metal surface and the frequency of the excitation current. Due to the influence of the magnetic field excited by the eddy currents, the equivalent impedance value of the induction coil 122 changes. Therefore, the parameter information of the conductor specimen or the presence of defects can be reflected by measuring the change in the impedance value of the induction coil 122. Using this non-destructive testing method, compared with other testing methods, it is harmless to the human body and the environment. In addition, since the magnetic permeability and conductivity of the concrete material are close to those of air, no interference will be caused during electromagnetic testing of its interior. It has strong anti-interference ability when detecting metal substances. And using electromagnetic induction for non-destructive measurement can reduce the weight of the device, making the device portable and conducive to on-site detection. Further, there are multiple induction coils 122. Some of the induction coils 122 among the multiple induction coils 122 are peripheral induction coils 122, and the other part is a central induction coil 122. The connection lines of the arrangement positions of the multiple peripheral induction coils 122 form a regular polygon, and the central induction coil 122 is arranged at the center of the regular polygon. Based on this, during the detection process, the steel bars can be positioned based on the peripheral induction coils 122 and the central induction coil 122, which can improve the detection accuracy, and further improve the detection depth. Since it is easy to position, the influence of adjacent steel bars on the detection results can be reduced, enabling the non-destructive testing device for concrete poles to detect complex steel bar environments.

[0110] In a feasible implementation manner, the non-destructive testing device for concrete poles further includes: a processor component. The processor component is connected to the detection component 120. The processor determines the steel bar information in the concrete pole based on the detection results of the multiple induction coils 122. Among them, the steel bar information includes at least one of position information, diameter information, and orientation information.

[0111] In this technical solution, the non-destructive testing device for concrete poles can further include a processor component. Through the setting of the processor component, it is convenient to store and calculate the detection results of the induction coils 122, and the detection efficiency can be improved.

[0112] In a feasible implementation, the processor component includes: a local processor connected to the detection component 120 for controlling the activation of the detection component 120 and collecting the detection results of a plurality of induction coils 122; and a host processor connected to the local processor for obtaining the detection results of the plurality of induction coils 122 and determining the steel bar information in the concrete pole based on the detection results.

[0113] In this technical solution, the structural composition of the processor component is further provided. The processor component may include a local processor and a host processor. The local processor and the detection component 120 may be disposed within the housing component 110. The local processor may be responsible for data collection and storage tasks. There is no need for a mechanical connection relationship between the host processor and the detection component 120. The local processor and the host processor may be connected by wireless communication, as long as the results collected by the induction coil 122 can be sent to the host processor for processing. The host processor can then determine the steel bar information in the concrete pole based on the results collected by the induction coil 122.

[0114] In a feasible implementation, there are 4 peripheral induction coils 122, and the regular polygon is a square. With this arrangement, while improving the positioning accuracy, it is convenient to reduce the number of induction coils 122 provided, and the structure of the non-destructive testing device for concrete poles can be simplified.

[0115] In a feasible implementation, the detection component 120 further includes: an iron core inserted into the induction coil 122.

[0116] In this technical solution, an iron core may also be provided within the induction coil 122. By providing the iron core, the sensitivity of the induction coil 122 can be significantly enhanced. By introducing the iron core, not only is the sensitivity of the induction coil 122 improved, but also the problem of having to use large coils to improve sensitivity is avoided, thus solving the problem of miniaturization of the induction coil 122. The iron core serves as the path of the magnetic field in the induction coil 122 and can effectively concentrate and enhance the magnetic field.

[0117] In some examples, the detection component 120 further includes a resistor component connected to the induction coil 122. A low-value resistor is added to the induction coil 122 to optimize signal transmission. Specifically, a voltage-current converter is used as the output converter, and a low-frequency correction circuit R1C is introduced to adjust the low-frequency characteristics of the low-resistance load. This design helps filter out low-frequency noise and ensure the clarity and accuracy of the output signal of the induction coil 122.

[0118] In some examples, the non-destructive testing device for concrete poles may further include a housing assembly 110 and an auxiliary wheel assembly 130. The detection assembly 120 and the local processor are disposed within the housing assembly 110, and the auxiliary wheel assembly 130 is connected to the housing assembly 110. By providing the auxiliary wheel assembly 130, it is convenient for the non-destructive testing device for concrete poles to move on the concrete poles.

[0119] As Figures 2 to 7 shown, in a feasible implementation manner, the housing assembly 110 includes: a first housing 111 and a second housing 112, and the first housing 111 is used to be connected to the second housing 112; the detection assembly 120 further includes a main control board 123, and the main control board 123 is connected to the magnetic field excitation source 121 and the induction coil 122; wherein, the first housing 111 is connected to the main control board 123 through a buckle 113; and / or the second housing 112 is connected to the main control board 123 through a buckle 113.

[0120] In this technical solution, the style of the housing assembly 110 is further provided. The housing assembly 110 may include a first housing 111 and a second housing 112. The housing assembly 110 is formed by splicing the first housing 111 and the second housing 112, which is convenient for assembling the detection assembly 120 into the housing assembly 110 and for installing the auxiliary wheel assembly 130.

[0121] In this technical solution, the first housing 111 is connected to the main control board 123 through a buckle 113; and / or the second housing 112 is connected to the main control board 123 through a buckle 113. Such a setting can reduce or eliminate the use of metal parts to fix the main control board 123, simplify the installation process, and reduce the electromagnetic interference during the operation of the instrument.

[0122] As Figures 2 to 7 shown, in a feasible implementation manner, positioning posts 114 are formed on at least one of the first housing 111 and the second housing 112. The positioning posts are used to abut against the main control board 123 to position the main control board 123.

[0123] In this technical solution, positioning posts 114 may also be formed on the first housing 111 and the second housing 112. By abutting the positioning posts 114 against the main control board 123, it is ensured that the circuit board is installed in the correct position, avoiding the displacement and vibration of the main control board 123, and ensuring the stability of the non-destructive testing device for concrete poles during operation.

[0124] In a feasible implementation, the auxiliary wheel assembly 130 includes: a measuring wheel 131, the measuring wheel 131 includes a first wheel body and a bracket 132, the bracket 132 is connected to the second housing 112 and is snap-connected to the main control board 123, and the measuring wheel 131 is connected between them and is arranged on both sides in the width direction of the second housing 112; a supporting wheel 133, the supporting wheel 133 is connected to the first housing 111 and / or the second housing 112 and is arranged on both sides in the length direction of the second housing 112.

[0125] In this technical solution, the structural composition of the auxiliary wheel assembly 130 is further provided. The auxiliary wheel assembly 130 may include a measuring wheel 131 and a supporting wheel 133. The bracket 132 of the measuring wheel 131 is designed at both ends of the second housing 112 and uses four small claws to clamp the main control board 123, which can further fix the main control board 123 and reduce the use of screws, improving the structural stability. The supporting wheel 133 on the second housing 112 is partially designed with a boss to prevent the supporting wheel 133 from getting stuck when approaching the inner wall, ensuring that the wheel can roll smoothly and improving the smoothness of the instrument during the detection process; the wheel bodies on both sides of the measuring wheel 131 part are used to measure the thickness, steel bar position, quantity and spacing of the cement pole. Its structure is designed to be light and wear-resistant. Both the measuring wheel 131 and the supporting wheel 133 are made of high-strength wear-resistant materials to ensure the smooth movement of the instrument in various detection environments. The measuring wheel 131 part is responsible for measuring the concrete thickness and steel bar position, and the supporting wheel 133 part provides stable rolling support. The boss design of the supporting wheel 133 prevents the supporting wheel 133 from getting stuck when approaching the inner wall, ensuring the smoothness and stability when the wheel rolls.

[0126] In a feasible implementation, the non-destructive testing device for concrete poles further includes: a length-measuring wheel and a position induction coil 122, the length-measuring wheel is connected to the supporting wheel 133, and the position induction coil 122 is arranged inside the housing assembly 110.

[0127] In this technical solution, the structural composition of the non-destructive testing device for concrete poles is further provided. The non-destructive testing device for concrete poles may include a length-measuring wheel and a position induction coil 122. With such a setting, during use, the user can hold the non-destructive testing device for concrete poles and move it on the concrete pole. By setting the length-measuring wheel and the position induction coil 122, the moving distance of the non-destructive testing device for concrete poles can be determined, and combined with the detection results of the non-destructive testing device for concrete poles, an internal metal distribution map of the concrete pole can be drawn.

[0128] As Figure 2 shown, in a feasible implementation, a holding portion 115 is formed on the first housing 111. With such a setting, the non-destructive testing device for concrete poles is made more portable and more convenient for on-site detection.

[0129] In a feasible implementation, the magnetic field excitation source 121 includes at least one of an alternating current signal coil, a direct current signal coil, and a permanent magnet.

[0130] In this technical solution, the form of the magnetic field excitation source 121 is further provided. The magnetic field excitation source 121 may include at least one of an alternating current signal coil, a direct current signal coil, and a permanent magnet. By setting it in this way, a pulsed magnetic field can be emitted through the magnetic field excitation source 121.

[0131] In a feasible implementation, when the magnetic field excitation source 121 includes a permanent magnet: the shape of the permanent magnet is a cuboid.

[0132] In this technical solution, the shape of the permanent magnet is further provided when the magnetic field excitation source 121 includes a permanent magnet. The shape of the permanent magnet is a cuboid. The magnetic field intensity at the center position of the cuboid permanent magnet is higher, but the magnetic field intensity at its edge is also relatively high, and the coverage range is relatively wide, which is suitable for detection in a wide range, and can reduce the probability of omission of metal part detection.

[0133] In a feasible implementation, when the magnetic field excitation source 121 includes a permanent magnet: the shape of the permanent magnet is a cylinder.

[0134] In this technical solution, the shape of the permanent magnet is further provided when the magnetic field excitation source 121 includes a permanent magnet. The shape of the permanent magnet is a cylinder. The magnetic field intensity of the cylindrical permanent magnet is concentrated at the center position, and the edge decays faster, which is suitable for precise detection in a local area and can improve the detection accuracy. By using a cylindrical permanent magnet, the detection device can more effectively detect the state of steel bars in concrete, reduce the interference caused by adjacent steel bars, and ensure the accuracy and reliability of the detection results. This choice significantly improves the performance of the detection instrument in practical applications, enabling it to provide high-quality detection data in complex detection environments.

[0135] In a feasible implementation, the distance between the magnetic field excitation source 121 and the induction coil 122 is 10 mm to 20 mm.

[0136] In this technical solution, the positional relationship between the magnetic field excitation source 121 and the induction coil 122 is further provided. The distance between the magnetic field excitation source 121 and the induction coil 122 is 10 mm to 20 mm. By setting it in this way, the situation where the change amount of the secondary magnetic field of the steel bar cannot be effectively detected due to the too close or too small distance between the two is avoided, ensuring that the device can provide accurate detection data in various complex environments.

[0137] In a feasible implementation, the detection assembly 120 further includes: an iron core, and the iron core is inserted into the induction coil 122.

[0138] According to a second aspect of the embodiments of the present application, a computer-readable storage medium is provided. The computer-readable storage medium stores a computer program, which implements the non-destructive testing method for high-precision concrete poles as described in any of the above technical solutions.

[0139] Since the computer-readable storage medium provided by the embodiments of the present application implements the non-destructive testing method for high-precision concrete poles as described in any of the above technical solutions, this computer-readable storage medium has all the beneficial effects of the non-destructive testing method for high-precision concrete poles in the above computing solutions, which will not be elaborated here.

[0140] According to a third aspect of the embodiments of the present application, a control device is provided, including: a memory that stores a computer program; a processor that executes the computer program; wherein, when the processor executes the computer program, it implements the non-destructive testing method for high-precision concrete poles as described in any of the above technical solutions.

[0141] Since the control device provided by the embodiments of the present application implements the non-destructive testing method for high-precision concrete poles as described in any of the above technical solutions, this control device has all the beneficial effects of the non-destructive testing method for high-precision concrete poles in the above computing solutions, which will not be elaborated here.

[0142] In the present invention, the terms "first", "second", and "third" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance; the term "plurality" refers to two or more, unless otherwise clearly defined. Terms such as "installed", "connected", "connected to", and "fixed" should all be understood in a broad sense. For example, "connected" can be a fixed connection, a detachable connection, or an integral connection; "connected" can be a direct connection or an indirect connection through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0143] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by terms such as "upper", "lower", "left", "right", "front", and "rear" is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or unit referred to must have a specific direction, be constructed and operated in a specific orientation, and therefore, cannot be construed as a limitation to the present invention.

[0144] In the description of this specification, the descriptions of terms such as "one embodiment", "some embodiments", "specific embodiments", etc. mean that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or instance. Moreover, the specific features, structures, materials or characteristics described can be combined in a suitable manner in any one or more embodiments or examples.

[0145] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention can have various changes and modifications. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A high detection accuracy nondestructive testing method for concrete poles, characterized in that: Applied to a nondestructive testing device for concrete poles, the nondestructive testing device for concrete poles includes a magnetic field excitation source and an induction coil. The high detection accuracy nondestructive testing method for concrete poles includes: The nondestructive testing device for concrete poles is turned on to obtain an initial testing result of the induction coil when no steel bars are present around the nondestructive testing device for concrete poles; Based on the initial detection result, performing zero position calibration on the induction coil; The concrete pole nondestructive testing device is driven close to the concrete pole, and the magnetic field excitation source is turned on to output a pulsed magnetic field; The induction coil outputs an equivalent impedance value based on the zero position calibration; Based on the equivalent impedance value, determining parameter information of steel bars in the concrete pole; In response to the waveform scanning instruction, controlling the concrete pole nondestructive testing device to move on the concrete pole along a preset direction; The waveform variation curve of the equivalent impedance value output by the induction coil based on the zero position calibration; Based on the waveform change curve, determine the position and density of the steel bars; The step of calibrating the output equivalent impedance value of the induction coil based on the zero position comprises: Controlling the concrete pole nondestructive testing device to move on the concrete pole; Obtaining a change trend of a detection result output by the induction coil based on the zero position calibration; When the detection result is at a peak value, the steel bar is located, and the peak value is used as the equivalent impedance value.

2. The high detection accuracy nondestructive testing method for concrete poles according to claim 1 is characterized in that: The step of determining the parameter information of the steel bars in the concrete pole based on the equivalent impedance value comprises: Building a database based on the steel bar position information, concrete thickness information and steel bar size information of the concrete pole with known steel bar parameter information and the standard equivalent impedance value corresponding to the steel bar parameter information; Based on the equivalent impedance value, a comparison is performed in the database to obtain steel bar parameter information matching the equivalent impedance value.

3. The high detection accuracy nondestructive testing method for concrete poles according to claim 2 is characterized in that: The step of performing comparison in the database based on the equivalent impedance value to obtain the steel bar parameter information matching the equivalent impedance value comprises: Obtaining an upper limit standard equivalent impedance value and a lower limit standard equivalent impedance value corresponding to the equivalent impedance value in a database; Outputting a first matching result based on the upper limit standard equivalent impedance value; Outputting a second matching result based on the lower limit standard equivalent impedance value; Based on the first matching result and the second matching result, a qualified distribution status of the steel bars of the concrete pole is determined.

4. The high detection accuracy nondestructive testing method for concrete poles according to claim 3 is characterized in that: The upper limit standard equivalent impedance value is the standard equivalent impedance value that is closest to the equivalent impedance value in the database and is greater than or equal to the equivalent impedance value; the lower limit standard equivalent impedance value is the standard equivalent impedance value that is closest to the equivalent impedance value in the database and is less than or equal to the equivalent impedance value.

5. The high detection accuracy nondestructive testing method for concrete poles according to claim 4 is characterized in that: The step of determining the qualified distribution state of the steel bars of the concrete pole based on the first matching result and the second matching result comprises: Determine the importance level of concrete poles; When the importance level is level one, if both the first matching result and the second matching result meet the qualification requirements, the distribution of the steel bars of the concrete pole is determined to be qualified; When the importance level is level 2, if at least one of the first matching result and the second matching result meets the qualification requirement, the distribution of the steel bars of the concrete pole is determined to be qualified.

6. The high detection accuracy nondestructive testing method for concrete poles according to any one of claims 1 to 5, characterized in that: There are multiple induction coils, and the step of calibrating the output equivalent impedance value of the induction coil based on the zero position includes: Obtaining an equivalent impedance value of each of the induction coils based on the zero position calibration; An average value of the equivalent impedance values ​​of the plurality of induction coils is used as an output result.

7. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores a computer program for implementing the high-detection-precision nondestructive testing method for concrete poles according to any one of claims 1 to 6.

8. A control device, characterized in that: include: a memory storing a computer program; A processor, configured to execute the computer program; Wherein, when executing the computer program, the processor implements the high detection accuracy non-destructive detection method for concrete poles as described in any one of claims 1 to 6.

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