Ultrathin strip current detection device and method based on pulsed excitation magnetic field detection

Abstract

The invention discloses an ultra-thin strip current detection device and method based on pulsed excitation magnetic field detection, and belongs to the technical field of metal material processing and detection. The device comprises a main control module, a magnetic induction matrix acquisition module and a transverse reciprocating module. The magnetic induction matrix acquisition module is used for acquiring space magnetic field signals excited by pulse current on the surface of the ultra-thin strip; the transverse reciprocating module drives the sensor array to do reciprocating motion in the width direction of the strip, and in combination with conveying in the rolling direction of the strip, a composite scanning track of transverse reciprocating and longitudinal rolling is formed, so that a detection blind area caused by physical intervals of sensors is filled up; and the main control module is used for coordinating motion control and data acquisition, processing and inverting the acquired magnetic field signal, and reconstructing a two-dimensional current density distribution image in the plane of the ultra-thin strip. According to the invention, non-contact, high-resolution and visual detection of pulse current distribution in the electroplastic rolling process is realized, and an accurate basis is provided for process optimization and quality control.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of metal material processing detection, and particularly relates to an ultra-thin strip current detection device and method based on pulsed excitation magnetic field detection. BACKGROUND

[0002] With the rapid development of aerospace and new energy fields, the demand for micron-level titanium alloy, stainless steel and other ultra-thin high-strength metal strips is increasingly urgent. However, when the thickness of such materials is in the micron level, the work hardening effect is significant, and the deformation resistance increases sharply. The traditional cold rolling process faces the problems of excessive rolling force and difficult control of the shape of the plate, and even frequent instantaneous strip breakage, which is difficult to meet the manufacturing requirements.

[0003] To solve the above problems, the electroplastic rolling technology emerges as the times require and gradually becomes the mainstream. The technology applies high-energy pulse current in the deformation zone, and uses the "electroplastic effect" to greatly reduce the deformation resistance of the metal and improve the plasticity, thereby solving the problems of difficult deformation and easy breakage of the thin strip. However, the stability of this process depends on the uniformity of the distribution of the pulse current in the plane of the strip. Affected by the edge effect and the unevenness of the plate shape, the current is prone to uneven distribution in the width direction, which directly leads to different degrees of softening in the rolling area and causes warping and other adverse effects.

[0004] This puts forward very high requirements for current distribution detection. The current non-contact current detection technology mainly includes two categories: detection based on thermal effect and detection based on magnetic effect. However, the existing technology has significant limitations in the specific scenario of electroplastic rolling of ultra-thin strips. The detection based on thermal effect is extremely complex in the rolling process, and the heat field on the surface of the strip is superimposed with intense plastic deformation heat, friction heat in the roll gap, and Joule heat of the pulse current. In addition, a large amount of lubricating coolant must be applied for some rolling processes, and the coverage and flow of the liquid film will block the heat radiation and uneven strong heat dissipation. Therefore, relying solely on temperature distribution to infer current distribution has extremely low signal-to-noise ratio and is extremely inaccurate. The detection based on magnetic effect is mostly designed based on the linear conductor model, and only the total current scalar in the loop can be obtained, and the complex two-dimensional current density vector distribution inside the plane conductor cannot be analyzed.

[0005] Therefore, there is an urgent need for a non-contact pulse current plane distribution detection device and method for electroplastic rolling, which can intuitively and accurately obtain the current density distribution in the plane of the ultra-thin strip and provide key data support for process optimization and quality control. SUMMARY

[0006] The purpose of the present application is to provide an ultra-thin strip current detection device and method based on pulsed excitation magnetic field detection to solve the problems existing in the prior art.

[0007] To achieve the above objectives, the present invention provides an ultrathin current detection device based on pulsed excitation magnetic field detection, comprising:

[0008] Main control module;

[0009] A magnetic induction matrix acquisition module is communicatively connected to the main control module. The magnetic induction matrix acquisition module is used to acquire the spatial magnetic field signal excited by the pulse current flowing through the ultra-thin strip and transmit the acquired spatial magnetic field signal to the main control module.

[0010] A transverse reciprocating module is connected to the main control module. The transverse reciprocating module is used to carry and drive the magnetic induction matrix acquisition module to reciprocate along a direction parallel to the ultra-thin strip.

[0011] The main control module is used to control the movement of the transverse reciprocating module and to receive and process the spatial magnetic field signals acquired by the magnetic induction matrix acquisition module in order to reconstruct the two-dimensional current density distribution in the plane of the ultrathin strip.

[0012] Preferably, the magnetic induction matrix acquisition module includes a sensor matrix PCB board connected to the lateral reciprocating module. The sensor matrix PCB board communicates with the main control module via an I2C bus, SPI bus, or I3C bus, and connects to multiple magnetic sensors by extending the communication channel through a multiplexer. The multiple magnetic sensors are arranged in an array on the sensor matrix PCB board.

[0013] Preferably, the transverse reciprocating module includes a mounting plate, a closed-loop stepper motor mounted on the mounting plate, an eccentric harmonic cam mechanism driven by the closed-loop stepper motor, and a sensor matrix mounting plate driven by the eccentric harmonic cam mechanism to perform linear reciprocating motion, wherein the magnetic induction matrix acquisition module is mounted on the sensor matrix mounting plate.

[0014] Preferably, the eccentric harmonic cam mechanism includes a reciprocating cam and a sensor matrix mounting plate connected to the reciprocating cam via a cam bearing; the sensor matrix mounting plate is equipped with multiple sensor matrix mounting columns, and the sensor matrix PCB board is connected to the sensor matrix mounting plate via the sensor matrix mounting columns.

[0015] Preferably, the lateral reciprocating module further includes a linear guide pair for guiding the movement of the sensor matrix mounting plate, the linear guide pair including a slide rail mounted on the mounting plate and a slider connected to the slide rail.

[0016] Preferably, the lateral reciprocating module further includes a photoelectric positioning unit for calibrating the origin position of the reciprocating motion. The photoelectric positioning unit includes an optocoupler copper column fixedly mounted on the mounting plate, an optocoupler switch fixedly mounted on the optocoupler copper column, and a light-shielding plate that moves with the sensor matrix PCB board.

[0017] Preferably, the main control module includes a microcontroller, which is configured with a dual buffer. The dual buffer is used to store the two-dimensional magnetic field matrix data and the corresponding mechanical position coordinates acquired by the magnetic induction matrix acquisition module in real time.

[0018] Preferably, the ultra-thin strip current detection device further includes a foot for adjusting the height. The foot is mounted on the mounting plate and is used to adjust the detection plane of the magnetic induction matrix acquisition module to be parallel to the surface of the ultra-thin strip.

[0019] Preferably, when the main control module processes data, it performs the following steps:

[0020] Motion distortion correction and background noise filtering are performed on the collected raw magnetic field data;

[0021] Based on the mechanical position information, the corrected and filtered discrete magnetic field data are stitched together to form a continuous two-dimensional magnetic field distribution cloud map;

[0022] Based on the two-dimensional magnetic field distribution cloud map, the two-dimensional current density distribution map in the plane of the ultra-thin strip is calculated by the current density inversion algorithm.

[0023] This invention provides a method for detecting current in an extremely thin band based on pulsed excitation magnetic field detection, comprising the following steps:

[0024] The ultra-thin strip current detection device is set on the mill exit side, so that the detection plane of the magnetic induction matrix acquisition module is parallel to the surface of the ultra-thin strip and maintains a preset distance.

[0025] The magnetic induction matrix acquisition module is calibrated when a DC current or a known current is applied to the ultrathin strip.

[0026] When the ultra-thin strip is not powered, the transverse reciprocating module is activated to scan and collect ambient background magnetic field noise data.

[0027] The electroplastic rolling process is initiated, so that the ultrathin strip is subjected to the pulse current to be measured while it is rolling longitudinally;

[0028] The transverse reciprocating module and the magnetic induction matrix acquisition module are started simultaneously to acquire the dynamic magnetic field signal excited by the pulse current;

[0029] The acquired dynamic magnetic field signal is transmitted to the main control module, which performs data processing and current density inversion to generate and output a two-dimensional current density distribution image in the plane of the ultra-thin strip.

[0030] Compared with the prior art, the present invention has the following advantages and technical effects:

[0031] 1. This invention achieves a breakthrough in imaging the vector distribution of planar current density from total current scalar detection, which can intuitively and quantitatively reflect the uniformity of current distribution in the width direction of the strip.

[0032] 2. This invention effectively overcomes the limitation of sensor physical size on spatial resolution through a composite scanning mechanism, achieving blind-spot-free, high-density full-coverage detection.

[0033] 3. This invention fully utilizes the high-frequency characteristics and edge aggregation effect of the pulse current itself for magnetic field detection. It has strong resistance to complex thermal fields, vibrations, and coolant interference on site, and has high detection signal-to-noise ratio and reliability.

[0034] 4. The device of the present invention has a compact structure, precise control, and is easy to integrate into existing rolling production lines, enabling online and real-time detection and feedback, and providing a key tool for the dynamic optimization of electroplastic rolling process parameters. Attached Figure Description

[0035] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0036] Fig. 1 This is a schematic diagram of the device provided in an embodiment of the present invention from a frontal view.

[0037] Fig. 2 This is a three-dimensional schematic diagram of the overall structure of the device provided in an embodiment of the present invention.

[0038] Fig. 3 This is a schematic diagram of the lower-level mechanism (mainly showing the lateral reciprocating module) in the device provided in the embodiment of the present invention.

[0039] Fig. 4 This is a schematic diagram illustrating the sensor array detection and sampling principle provided in an embodiment of the present invention.

[0040] In the diagram: 1. Foot; 2. Reciprocating cam; 3. Mounting plate; 4. Stepper motor; 5. Electrical control box; 6. Battery; 7. Slide rail; 8. Slider; 9. Optocoupler copper column; 10. Optocoupler switch; 11. Light shield; 12. Sensor matrix mounting column; 13. Sensor matrix PCB board; 14. Sensor matrix mounting plate; 15. Cam bearing; 16. Magnetic sensor. Detailed Implementation

[0041] It should be noted that, unless otherwise specified, the embodiments and features described in this invention can be combined with each other. The described embodiments are merely some, not all, of the embodiments of this invention. All other embodiments obtained by those skilled in the art without inventive effort are within the scope of protection of this invention. The invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0042] like Figs. 1 to 4 As shown, the present invention provides an ultrathin current detection device based on pulsed excitation magnetic field detection, comprising:

[0043] Main control module;

[0044] The magnetic induction matrix acquisition module is connected to the main control module. The magnetic induction matrix acquisition module is used to acquire the space magnetic field signal excited by the pulse current flowing through the ultra-thin strip and transmit the acquired space magnetic field signal to the main control module.

[0045] The transverse reciprocating module is connected to the main control module. The transverse reciprocating module is used to carry and drive the magnetic induction matrix acquisition module to reciprocate along the direction parallel to the ultra-thin strip.

[0046] The main control module controls the movement of the transverse reciprocating module and receives and processes the spatial magnetic field signals acquired by the magnetic induction matrix acquisition module to reconstruct the two-dimensional current density distribution in the plane of the ultrathin strip.

[0047] This invention, through the configuration of the main control module, serves as the core of control and processing for the entire detection system. It is responsible for sending motion commands to the lateral reciprocating module, receiving raw data from the magnetic induction matrix acquisition module, and executing complex data processing and current density inversion algorithms, ultimately outputting a visualized current distribution image. The magnetic induction matrix acquisition module enables non-contact sensing of the spatial gradient magnetic field generated by pulsed current within the plane of an extremely thin strip. This module integrates multiple magnetic sensors 16 into an array on a sensor matrix PCB board 13, achieving distributed synchronous or rapid scanning acquisition of magnetic field signals, providing the necessary data source for two-dimensional current distribution inversion. The lateral reciprocating module drives the magnetic induction matrix acquisition module to perform high-precision, stable reciprocating motion parallel to the strip width. This motion, combined with the longitudinal rolling motion of the strip itself, allows the discretely distributed sensor array to weave a high-density detection grid in space, effectively compensating for the physical gaps caused by the sensor's packaging size and significantly improving the spatial resolution of the detection.

[0048] Further optimization of the scheme: the magnetic induction matrix acquisition module includes a sensor matrix PCB board 13 connected to the lateral reciprocating module. The sensor matrix PCB board 13 communicates with the main control module through an I2C bus, SPI bus or I3C bus, and connects to multiple magnetic sensors 16 by extending the communication channel through a multiplexer. The multiple magnetic sensors 16 are arranged in an array on the sensor matrix PCB board 13.

[0049] By configuring the sensor matrix PCB board 13, the array magnetic sensors 16, and a specific bus communication protocol, a high-density, scalable magnetic field signal acquisition network can be constructed. Array arrangement is a prerequisite for obtaining planar magnetic field distribution; the sensor matrix PCB board 13 provides stable and reliable electrical interconnection and mechanical support; using buses such as I2C, SPI, or I3C in conjunction with multiplexers, a large number of sensors can be efficiently and synchronously managed with limited controller interfaces, meeting the timing and bandwidth requirements of high-speed data acquisition.

[0050] The scheme is further optimized. The horizontal reciprocating module includes a mounting plate 3, a closed-loop stepper motor 4 mounted on the mounting plate 3, an eccentric harmonic cam mechanism driven by the closed-loop stepper motor 4, and a sensor matrix mounting plate 14 driven by the eccentric harmonic cam mechanism to perform linear reciprocating motion. The magnetic induction matrix acquisition module is mounted on the sensor matrix mounting plate 14.

[0051] The combination of the closed-loop stepper motor 4, the eccentric harmonic cam mechanism, and the sensor matrix mounting plate 14 effectively and smoothly converts the rotational motion of the motor into the linear reciprocating motion required by the sensor array. The motion characteristics of the harmonic cam ensure a smooth reciprocating process without rigid impact, which is beneficial for maintaining detection stability during high-speed motion; the closed-loop stepper motor 4 provides precise position and speed control, ensuring the repeatability of the scanning trajectory.

[0052] The scheme is further optimized. The eccentric harmonic cam mechanism includes a reciprocating cam 2 and a sensor matrix mounting plate 14 connected to the reciprocating cam 2 via a cam bearing 15. Multiple sensor matrix mounting columns 12 are mounted on the sensor matrix mounting plate 14, and the sensor matrix PCB board 13 is connected to the sensor matrix mounting plate 14 via the sensor matrix mounting columns 12.

[0053] Through the detailed structural arrangement of the reciprocating cam 2, cam bearing 15, sensor matrix mounting plate 14, and sensor matrix mounting column 12, reliable power transmission and conversion from the rotary cam to the linear motion platform can be achieved. The cam bearing 15 reduces friction and wear; the sensor matrix mounting plate 14 and sensor matrix mounting column 12 form a stable mounting frame, ensuring the rigidity and positional accuracy of the sensor matrix PCB board 13 during high-speed reciprocating motion and preventing vibration from interfering with detection.

[0054] Further optimization of the scheme includes a linear guide pair for guiding the movement of the sensor matrix mounting plate 14. The linear guide pair includes a slide rail 7 mounted on the mounting plate 3 and a slider 8 connected to the slide rail 7.

[0055] The linear guide pair consisting of slide rail 7 and slider 8 provides high-precision linear guidance and support for the movement of the sensor matrix mounting plate 14. It constrains the degrees of freedom of movement, ensuring that the reciprocating motion strictly follows a preset straight path, effectively eliminating possible swaying and torsion, thus guaranteeing the straightness and positional accuracy of the scanning trajectory. This is crucial for the subsequent precise mapping of magnetic field data to spatial coordinates.

[0056] Further optimization of the scheme includes a photoelectric positioning unit for calibrating the origin position of the reciprocating motion in the transverse reciprocating module. The photoelectric positioning unit includes an optocoupler copper column 9 fixedly mounted on the mounting plate 3, an optocoupler switch 10 fixedly mounted on the optocoupler copper column 9, and a light shield 11 that moves with the sensor matrix PCB board 13.

[0057] The photoelectric positioning unit provides an absolute position reference for the entire reciprocating scanning motion. At the beginning of each scanning cycle, the light-shielding plate 11 triggers the optocoupler switch 10, generating a precise zero-point signal. The main control module uses this signal to periodically calibrate the motion position, thereby establishing and maintaining a strictly spatiotemporally synchronized coordinate system. This eliminates the cumulative errors caused by stepper motor 4 step loss or transmission backlash, ensuring the geometric fidelity of data stitching during long-term continuous detection.

[0058] The scheme is further optimized. The main control module includes a microcontroller, which is equipped with a dual buffer. The dual buffer is used to store the two-dimensional magnetic field matrix data and the corresponding mechanical position coordinates collected by the magnetic induction matrix acquisition module in real time.

[0059] By configuring a dual-buffer configuration within the microcontroller, high-speed, continuous, lossless data acquisition and temporary storage can be achieved. While one buffer is writing the magnetic field data and position coordinates acquired at the current moment, the data in the other, already full buffer can be safely read for subsequent processing or transmission. This operating mechanism resolves the mismatch between the high-speed sampling at the front end and the processing or transmission speed at the back end, ensuring system reliability and data integrity in scenarios involving massive data acquisition.

[0060] Further optimization of the design includes a height adjustment foot 1 for the ultra-thin strip current detection device. The foot 1 is mounted on the mounting plate 3 and is used to adjust the detection plane of the magnetic induction matrix acquisition module to be parallel to the surface of the ultra-thin strip.

[0061] The adjustable feet 1 allow for adaptation to different installation foundations and heights, enabling operators to finely adjust the overall level and height of the device. This ensures that the detection plane of the magnetic induction matrix acquisition module remains precisely parallel to the surface of the moving ultra-thin strip, maintaining a constant optimal detection distance. This maximizes the consistency and accuracy of magnetic field detection, reducing system errors introduced by improper installation.

[0062] To further optimize the solution, the main control module performs the following steps when processing data:

[0063] Motion distortion correction and background noise filtering are performed on the collected raw magnetic field data;

[0064] Based on the mechanical position information, the corrected and filtered discrete magnetic field data are stitched together to form a continuous two-dimensional magnetic field distribution cloud map;

[0065] Based on the two-dimensional magnetic field distribution cloud map, the two-dimensional current density distribution map in the plane of the ultrathin strip is calculated by the current density inversion algorithm.

[0066] By executing the specific data processing flow described above through the main control module, the original, noisy, and distorted discrete-point magnetic field data can be systematically transformed into a clear and accurate two-dimensional current density distribution image. Motion distortion correction compensates for the influence of the nonlinear motion of the scanning mechanism on the spatial distribution of sampling points; background noise filtering improves the effectiveness of the signal; spatial stitching reconstructs a complete panoramic view of the magnetic field distribution; and current density inversion completes the reverse solution from magnetic field to current from a physical principle. This series of algorithms is the technical hub that ultimately realizes the core detection function of this invention.

[0067] This invention provides a method for detecting current in an extremely thin band based on pulsed excitation magnetic field detection. This method, through standardized operating procedures, ensures that the device can operate stably and reliably and output valid results. Specifically, it includes the following steps:

[0068] The ultra-thin strip current detection device is set on the mill exit side, so that the detection plane of the magnetic induction matrix acquisition module is parallel to the surface of the ultra-thin strip and maintains a preset distance.

[0069] The magnetic induction matrix acquisition module is calibrated when a DC current or a known current is applied to an extremely thin strip.

[0070] With the ultra-thin strip unpowered, the transverse reciprocating module is activated to scan and collect ambient background magnetic field noise data.

[0071] The electroplastic rolling process is initiated, so that the ultra-thin strip is subjected to the pulse current to be measured while it is rolling longitudinally;

[0072] The transverse reciprocating module and the magnetic induction matrix acquisition module are started simultaneously to acquire the dynamic magnetic field signal excited by the pulse current;

[0073] The acquired dynamic magnetic field signal is transmitted to the main control module, which performs data processing and current density inversion to generate and output a two-dimensional current density distribution image in the plane of the ultrathin strip.

[0074] The ultra-thin strip current detection device based on pulse-excited magnetic field detection provided by this invention has the following overall implementation process: First, on-site installation and leveling are performed. The mounting plate 3 is kept horizontal by the ground feet 1, and the sensor matrix PCB board 13 is adjusted to be parallel to the surface of the ultra-thin strip being passed through and at an appropriate distance. After the device is powered on, the main control module initializes the system, controls the movement of the transverse reciprocating module, and triggers the optocoupler switch 10 by the light-shielding plate 11 to complete the mechanical origin calibration. Then, the calibration process is executed: when the strip is energized with a stable DC current, the readings of each magnetic sensor 16 are recorded for consistency calibration; when the strip is not energized but the rolling mill is running normally (the strip is moving), the transverse reciprocating scan is started, and the system collects and constructs a three-dimensional tensor model of the ambient background magnetic field noise. After calibration is completed, the system enters the test state. When the electroplastic rolling process is started, and the strip is energized with a high-energy pulse current and rolled forward, the main control module issues a synchronization command, simultaneously starting the reciprocating motion of the transverse reciprocating module and the high-speed sampling of the magnetic induction matrix acquisition module. Under the combined motion of longitudinal movement of the strip and lateral reciprocating motion of the sensor array, each magnetic sensor 16 in the array samples along a dense spatial trajectory, thereby achieving near-blind-zone-free full-coverage scanning of the strip surface. The large amount of spatiotemporally synchronized raw magnetic field data collected is stored in a dual buffer in real time. Subsequently, the main control module invokes the data processing algorithm chain: First, based on the kinematic model of the eccentric harmonic cam, the original data is resampled in the spatial domain to correct the uneven distribution of sampling points caused by variable speed motion; second, using the constructed background noise tensor, differential or filtering algorithms are used to filter out environmental magnetic interference; next, based on the precisely recorded mechanical coordinates of each data point, all discrete and corrected magnetic field data points are mapped onto a unified two-dimensional planar grid, and a continuous and smooth two-dimensional magnetic field intensity distribution cloud map is generated through interpolation; finally, based on the inverse problem solving algorithm of the Biot-Savart law (such as the Tikhonov regularized current density inversion algorithm), the magnetic field cloud map is numerically calculated to invert the magnitude and direction of the current density vector at each position in the ultra-thin strip plane, and finally displayed intuitively in the form of color cloud map, streamline diagram or vector diagram.

[0075] This invention provides a tool for directly and visually observing planar current distribution in the advanced electroplastic rolling process, achieving a leap from "blind adjustment" to "visual and controllable" operation, and providing indispensable data support for precise optimization of process parameters. Through innovative mechanical scanning and data processing schemes, it successfully overcomes the fundamental limitation of sensor physical size on detection resolution, achieving an effective spatial resolution far exceeding the static arrangement density of sensors, clearly capturing subtle distribution features such as edge aggregation and local concentration of current. Furthermore, the detection principle of this invention is based on the magnetic field excited by current, which is completely non-contact, causing no damage or interference to the strip, and is unaffected by the harsh environment of the rolling mill, exhibiting strong robustness and wide applicability.

[0076] The device of this invention is highly automated and intelligent, and can realize online, real-time or near real-time detection and feedback. It helps to build a closed-loop control system for the rolling process, which is of great significance for stabilizing product quality, improving yield, and promoting the advancement of high-efficiency and precision manufacturing technology for ultra-thin strips.

[0077] The above are merely preferred embodiments of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in the present invention should be included within the scope of protection of the present invention.

Claims

1. A thin-film current detection device based on pulsed excitation magnetic field detection, characterized in that, include: Main control module; A magnetic induction matrix acquisition module is communicatively connected to the main control module. The magnetic induction matrix acquisition module is used to acquire the spatial magnetic field signal excited by the pulse current flowing through the ultra-thin strip and transmit the acquired spatial magnetic field signal to the main control module. A transverse reciprocating module is connected to the main control module. The transverse reciprocating module is used to carry and drive the magnetic induction matrix acquisition module to reciprocate along a direction parallel to the ultra-thin strip. The main control module is used to control the movement of the transverse reciprocating module and to receive and process the spatial magnetic field signals acquired by the magnetic induction matrix acquisition module in order to reconstruct the two-dimensional current density distribution in the plane of the ultrathin strip.

2. The ultrathin current detection device based on pulsed excitation magnetic field detection according to claim 1, characterized in that, The magnetic induction matrix acquisition module includes a sensor matrix PCB board (13) connected to the transverse reciprocating module. The sensor matrix PCB board (13) communicates with the main control module via an I2C bus, SPI bus or I3C bus, and connects to multiple magnetic sensors (16) through a multiplexer to expand the communication channel. The multiple magnetic sensors (16) are arranged in an array on the sensor matrix PCB board (13).

3. The ultrathin current detection device based on pulsed excitation magnetic field detection according to claim 2, characterized in that, The transverse reciprocating module includes a mounting plate (3), a closed-loop stepper motor (4) mounted on the mounting plate (3), an eccentric harmonic cam mechanism driven by the closed-loop stepper motor (4), and a sensor matrix mounting plate (14) driven by the eccentric harmonic cam mechanism to perform linear reciprocating motion. The magnetic induction matrix acquisition module is mounted on the sensor matrix mounting plate (14).

4. The ultrathin current detection device based on pulsed excitation magnetic field detection according to claim 3, characterized in that, The eccentric harmonic cam mechanism includes a reciprocating cam (2) and a sensor matrix mounting plate (14) connected to the reciprocating cam (2) via a cam bearing (15); multiple sensor matrix mounting columns (12) are mounted on the sensor matrix mounting plate (14), and the sensor matrix PCB board (13) is connected to the sensor matrix mounting plate (14) via the sensor matrix mounting columns (12).

5. The ultrathin current detection device based on pulsed excitation magnetic field detection according to claim 3, characterized in that, The transverse reciprocating module also includes a linear guide pair for guiding the movement of the sensor matrix mounting plate (14), the linear guide pair including a slide rail (7) mounted on the mounting plate (3) and a slider (8) connected to the slide rail (7).

6. The ultrathin current detection device based on pulsed excitation magnetic field detection according to claim 3 or 5, characterized in that, The transverse reciprocating module also includes a photoelectric positioning unit for calibrating the origin position of the reciprocating motion. The photoelectric positioning unit includes an optocoupler copper column (9) fixedly mounted on the mounting plate (3), an optocoupler switch (10) fixedly mounted on the optocoupler copper column (9), and a light shield (11) that moves with the sensor matrix PCB board (13).

7. The ultrathin current detection device based on pulsed excitation magnetic field detection according to claim 1, characterized in that, The main control module includes a microcontroller, which is equipped with a dual buffer. The dual buffer is used to store the two-dimensional magnetic field matrix data and the corresponding mechanical position coordinates acquired by the magnetic induction matrix acquisition module in real time.

8. The ultrathin current detection device based on pulsed excitation magnetic field detection according to claim 3, characterized in that, The ultra-thin strip current detection device also includes a foot (1) for adjusting the height. The foot (1) is mounted on the mounting plate (3) and is used to adjust the detection plane of the magnetic induction matrix acquisition module to be parallel to the surface of the ultra-thin strip.

9. The ultrathin current detection device based on pulsed excitation magnetic field detection according to claim 1, characterized in that, When the main control module processes data, it performs the following steps: Motion distortion correction and background noise filtering are performed on the collected raw magnetic field data; Based on the mechanical position information, the corrected and filtered discrete magnetic field data are stitched together to form a continuous two-dimensional magnetic field distribution cloud map; Based on the two-dimensional magnetic field distribution cloud map, the two-dimensional current density distribution map in the plane of the ultra-thin strip is calculated by the current density inversion algorithm.

10. A method for detecting ultrathin band current based on pulsed excitation magnetic field detection, using the ultrathin band current detection device according to any one of claims 1 to 9, characterized in that, Includes the following steps: The ultra-thin strip current detection device is set on the mill exit side, so that the detection plane of the magnetic induction matrix acquisition module is parallel to the surface of the ultra-thin strip and maintains a preset distance. The magnetic induction matrix acquisition module is calibrated when a DC current or a known current is applied to the ultrathin strip. When the ultra-thin strip is not powered, the transverse reciprocating module is activated to scan and collect ambient background magnetic field noise data. The electroplastic rolling process is initiated, so that the ultrathin strip is subjected to the pulse current to be measured while it is rolling longitudinally; The transverse reciprocating module and the magnetic induction matrix acquisition module are started simultaneously to acquire the dynamic magnetic field signal excited by the pulse current; The acquired dynamic magnetic field signal is transmitted to the main control module, which performs data processing and current density inversion to generate and output a two-dimensional current density distribution image within the plane of the ultra-thin strip.

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