Surface magnetic full-detection device and detection method
By utilizing the mechanical structure and multi-channel data acquisition technology of the magnet inspection device, the problems of low efficiency and large errors in manual alignment during magnet inspection have been solved, enabling rapid, accurate, and automated magnet inspection and improving inspection efficiency and accuracy.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- CIYI (SUZHOU) ELECTRONIC TECH CO LTD
- Filing Date
- 2026-03-13
- Publication Date
- 2026-05-12
AI Technical Summary
In existing technologies, the detection of the magnetic field strength at the center point of a magnet surface relies on manual operation, resulting in low efficiency and large errors. This cannot meet the high-efficiency and rhythmic detection requirements of modern automated production lines, and the accuracy of the measurement results is highly dependent on the operator's skill and sense of responsibility.
The device employs a full magnetic inspection system, which uses a mechanical structure (positioning cavity) to achieve rapid, accurate, and automated alignment of the magnet. It uses magnetic attraction to fix the magnet, and combines multi-channel data acquisition and calibration processes to ensure the consistency and comparability of measurement results.
It enables rapid, accurate, and automated alignment of magnets, eliminates human error, improves the consistency and comparability of measurement results, increases data throughput and measurement accuracy, and meets the needs of efficient and cycle-based testing.
Smart Images
Figure CN122017696A_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of magnetic material testing technology, and in particular to a device and method for comprehensive magnetic surface inspection. Background Technology
[0002] In the production and quality control of magnets (such as neodymium iron boron permanent magnets), a full inspection of the magnetic field strength at the center point of the surface is a crucial step to ensure product performance consistency. Currently, the industry's standard testing method generally relies on handheld gaussmeters. Operators must use the gaussmeter probe to manually locate and precisely align it with the geometric center point of the radial surface of a single magnet for measurement, and then record the reading.
[0003] However, the aforementioned traditional manual inspection methods have the following inherent drawbacks, severely limiting inspection efficiency and accuracy, especially in high-volume, full-inspection applications: Because each magnet must be manually aligned and measured individually, the inspection of each magnet involves multiple time-consuming steps such as picking up and placing, aligning, reading, and recording. When the daily inspection volume is huge, this process becomes extremely cumbersome and slow, failing to meet the demands of modern automated production lines for efficient, rhythmic inspection. Furthermore, the accuracy of the measurement results is highly dependent on the operator's skill and sense of responsibility. The process of manually finding and aligning the geometric center of the magnet is subject to subjective error; different personnel or different operations by the same person may cause fluctuations in measurement results due to alignment deviations, affecting the fairness of the judgment and the consistency of product batches.
[0004] In summary, existing technologies suffer from low efficiency and large errors due to manual alignment, making it impossible to achieve efficient detection. Summary of the Invention
[0005] In order to achieve automatic, rapid and accurate batch testing of the magnetic field strength at the center point of multiple magnets, this application provides a surface magnetic field full inspection device.
[0006] In a first aspect, this application provides a magnetic field testing device, including a testing platform with a plurality of testing points. Each testing point corresponds to a testing unit, and each testing point has a positioning hole for inserting a magnet. The positioning hole can only accommodate a single magnet, and when the magnet is inserted into the positioning hole, the geometric center of the magnet contacts the detection sensing point of the corresponding testing unit. The testing unit is used to detect the magnetic field strength at the geometric center of the magnet in the positioning hole using the detection sensing point.
[0007] By adopting the above technical solution and utilizing the physical constraints of the mechanical structure (positioning acupoints), rapid, precise, and automated alignment of magnets is achieved. Operators only need to place the magnet into the acupoint, ensuring its geometric center automatically aligns with the detection point, eliminating the time required for manual visual inspection and fine-tuning. Furthermore, it eliminates subjective and accidental errors introduced by manual operation, ensuring that the measurement position of each magnet is fixed and repeatable, greatly improving the consistency and comparability of measurement results. The structure of the multiple detection points provides the physical basis and possibility for subsequent parallel and synchronous detection of multiple magnets, laying the foundation for the full inspection device.
[0008] Preferably, each of the positioning holes is also provided with a magnetic attracting element for magnetic attraction with the magnet.
[0009] By employing the above technical solution, the magnet is firmly attracted to the predetermined position using magnetic attraction, preventing any slight movement during the detection process and ensuring absolute stability of the measurement state. During the feeding process in the guide groove, after the magnet at the current acupoint is attracted and fixed, it can smoothly separate from the magnet stack above, allowing the subsequent magnet to slide into the next positioning acupoint. The magnetic attractant (such as stainless steel) serves as a magnetically conductive material, which can improve the distribution of magnetic field lines, making the magnetic field more concentrated and stable at the sensor sensing point, thus helping to improve signal quality.
[0010] Preferably, the detection platform is provided with a guide groove for the insertion and sliding of a magnet. The guide groove is connected to a number of positioning holes, and the opening direction of the guide groove satisfies that the magnet can be inserted into the positioning hole connected to the guide groove during the process of inserting into the guide groove and sliding along the opening direction of the guide groove.
[0011] By adopting the above technical solution, operators can place a stack of magnets into one end of the guide groove, and with a single slide, the magnets will automatically and sequentially fall into each positioning cavity, achieving extremely fast batch feeding and reducing the feeding time from N times to a single slide. During the sliding process, the magnets rely on gravity, inertia, and attraction to remain fixed, achieving automatic and reliable separation of the magnet stack.
[0012] Preferably, all the detection units are pre-divided into several detection groups, and all detection units belonging to the same detection group are electrically connected to a central control unit, and all central control units are electrically connected to a main control unit. Each of the central control units is used to control the connected detection units to detect the magnet, and to acquire and store the detection data obtained from the detection; the main control unit is used to communicate with the central control unit, acquire the detection data stored by the central control unit, and also to analyze the detection data to obtain the detection results, and to provide feedback on the detection results to the testing personnel.
[0013] By adopting the above technical solution, each central control unit independently handles the data acquisition and temporary storage of a group of detection units, realizing the parallel and synchronous acquisition of multi-channel data, transforming serial acquisition into parallel processing, and greatly improving data throughput. Distributing the data acquisition and storage tasks to multiple central control units significantly reduces the real-time processing pressure on the main control unit, allowing it to focus more on data fusion, judgment, and scheduling. In addition, the modular grouping design allows the magnetic stripe inspection device to flexibly increase or decrease the number of detection channels by simply adjusting the number and combination of central control units, demonstrating good scalability.
[0014] Preferably, the main control unit is electrically connected to the human-machine interaction unit, and the main control unit is used to display the detection results corresponding to all detection points to the detection personnel through the human-machine interaction unit; On the testing platform, a status indicator is provided near each testing point. The status indicator is electrically connected to the main control unit, which is used to provide feedback on the testing results to the testing personnel by controlling the display status of the status indicator.
[0015] By adopting the above technical solution, a centralized and detailed digital result display (such as specific values, waveforms, and statistical reports) is provided through a human-computer interaction unit, while distributed and intuitive physical location indication (such as red / green lights) is provided through status indicators. Inspection personnel do not need to view the screen and compare numbers; they can instantly and unambiguously locate the specific physical position of defective magnets simply by scanning the indicator light colors on the platform, greatly improving the efficiency of defective product sorting. This simultaneously meets the dual needs of in-depth data monitoring and rapid on-site operation, enhancing the overall user experience and operational efficiency.
[0016] Preferably, the human-machine interaction unit is also used to receive a calibration command triggered by the testing personnel and send the calibration command to the main control unit so that the main control unit can start the calibration process to obtain the calibration result; The human-computer interaction unit is also used to receive guidance information generated by the main control unit during the calibration process, and to update and provide feedback on the guidance information to the testing personnel in real time. The guidance information is used to remind the testing personnel to follow the guidance information to cooperate in completing the calibration process. The guidance information includes at least reminding the testing personnel to place the magnet into the designated positioning acupoint. The main control unit is used to correct the detection data based on the correction result after completing the correction process and when the detection data stored in the central control unit is obtained, and then analyze the corrected detection data to obtain the detection result.
[0017] By adopting the above technical solution and independently calibrating each positioning point, fixed deviations caused by mechanical, electrical, and environmental factors are compensated for, resulting in a high degree of uniformity in the measurement benchmark of the positioning points. This ensures that regardless of which positioning point the magnet is placed in, the measurement results are compensated for by the error specific to that positioning point, thereby significantly improving the overall absolute measurement accuracy and reliability of the entire device.
[0018] Preferably, the calibration process includes: The main control unit controls the human-machine interaction unit to provide guidance information to the testing personnel. The guidance information refers to prompting the testing personnel to place a standard magnet with a known accurate magnetic field strength value into the designated positioning point. The main control unit is used to obtain the detection data of the magnet in the designated positioning hole from the central control unit, and calculate the correction coefficient for the designated positioning hole based on a preset algorithm, and use the correction coefficient as the correction result.
[0019] By adopting the above technical solution, a complete, closed-loop calibration operation chain is provided, from guiding the placement of the standard magnet to acquiring data and calculating the storage coefficient. By using the same standard magnet to calibrate all positioning holes sequentially, the uniqueness and comparability of the calibration benchmark are ensured, and the process is clear, enabling calibration of all points to be completed in a short time. Secondly, this application discloses a method for full inspection of magnetic properties of a meter, applied to the full inspection device for magnetic properties of a meter described in the first aspect, comprising the following steps: Multiple magnets stacked together along the thickness direction are inserted into one end of the guide groove and slid along the length of the guide groove. During the sliding process, when the bottom magnet moves to the positioning hole connected to the guide groove, it is inserted into the positioning hole under its own weight and the magnetic attraction of the magnetic attractor, so that all magnets are set in a one-to-one correspondence with the positioning holes connected to the guide groove. The central control unit controls the detection unit to detect the magnetic field strength at the geometric center point of the magnet in each positioning hole, thereby obtaining and storing the detection data; The main control unit communicates with each central control unit to obtain the detection data of all detection points. Based on the correction coefficients pre-calibrated for each detection point, the main control unit corrects the detection data and compares it with the preset qualified data range to finally obtain the detection results of each magnet. The main control unit controls the human-machine interaction unit and / or status indicator to provide feedback on the test results to the testing personnel.
[0020] In summary, this application includes at least one of the following beneficial technical effects: Through the physical constraints of the mechanical structure (positioning points), rapid, precise, and automated alignment of the magnets is achieved. Operators simply place the magnet into the point, ensuring its geometric center automatically aligns with the detection point, eliminating the time spent on manual visual inspection and fine-tuning. Furthermore, it eliminates subjective and accidental errors introduced by manual operation, ensuring that the measurement position of each magnet is fixed and repeatable, greatly improving the consistency and comparability of measurement results. The structure of the multiple detection points provides the physical basis and possibility for subsequent parallel and synchronous detection of multiple magnets, laying the foundation for the full inspection device. Magnetic attraction is used to firmly attach magnets to predetermined positions, preventing any slight movement during the detection process and ensuring absolute stability of the measurement state. During the loading process in the guide groove, after the magnet at the current acupoint is attracted and fixed, it can smoothly separate from the magnet stack above, allowing the subsequent magnet to slide into the next positioning acupoint. The magnetic attractant (such as stainless steel) serves as a magnetic conductive material, which can improve the distribution of magnetic field lines, making the magnetic field more concentrated and stable at the sensor sensing point, thus helping to improve signal quality. Each central control unit independently handles the data acquisition and temporary storage of a group of detection units, enabling parallel and synchronous acquisition of multi-channel data. This transforms serial acquisition into parallel processing, significantly improving data throughput. Distributing data acquisition and storage tasks across multiple central control units significantly reduces the real-time processing pressure on the main control unit, allowing it to focus more on data fusion, judgment, and scheduling. Attached Figure Description
[0021] Figure 1 This is a schematic diagram of the structure of a magnetic stripe inspection device disclosed in an embodiment of this application.
[0022] Figure 2 This is an exploded schematic diagram of a magnetic stripe inspection device disclosed in an embodiment of this application.
[0023] Figure 3 yes Figure 2 The diagram shows the structure used to indicate the position of the magnetic accumulator.
[0024] Figure 4 This is a structural block diagram of a magnetic stripe inspection device disclosed in an embodiment of this application.
[0025] Explanation of reference numerals in the attached diagram: 1. Detection platform; 11. PCB board; 2. Detection point; 3. Detection unit; 4. Central control unit; 5. Main control unit; 6. Human-machine interaction unit; 7. Cover plate; 71. Guide groove; 72. Magnetic suction component; 73. Positioning hole; 8. Status indicator. Detailed Implementation
[0026] The following is in conjunction with the appendix Figure 1-4 This application will be described in further detail.
[0027] This application discloses a device for comprehensive magnetic surface inspection. (Refer to...) Figure 1 and Figure 2 The magnetic stripe inspection device includes an inspection platform 1, a PCB board 11 pre-installed inside the inspection platform 1, and several inspection points 2 (i.e., Figure 1 In this embodiment, the detection points 2 are distributed in a matrix along the length and width of the detection platform 1, forming several rows and columns. Each detection point 2 is equipped with a detection unit 3, which is specifically a Hall sensor electrically connected to the PCB board 11. A cover plate 7 is placed on top of the PCB board 11. A positioning hole 73 is provided near each detection point 2 on the cover plate 7. The size of the positioning hole 73 is consistent with the size of a single magnet (i.e., a single positioning hole 73 can only accommodate a single magnet). When a magnet is inserted into the positioning hole 73, the geometric center of the magnet is aligned with the detection sensing point of the detection unit 3, so that the detection unit 3 can detect the magnetic field strength at the geometric center of the magnet in the positioning hole 73.
[0028] Reference Figure 1 , Figure 2 and Figure 3 Near each positioning cavity 73, a magnetic attractor 72 is embedded in the cover plate 7. The magnetic attractor 72 is made of chromium-containing but nickel-free stainless steel, also known as Cr stainless steel. When a magnet is inserted into a positioning cavity 73, the magnetic attractor 72 and the magnet in the positioning cavity 73 are magnetically attracted and fixed, thus achieving precise and stable positioning of the geometric center point of the magnet and the detection sensing point of the detection unit 3. The magnetic attractor 72 is made of a magnetically conductive material. When the magnet is attracted to the magnetic attractor 72, a stable magnetic path is formed, which is beneficial for the detection unit 3 to obtain a stable and concentrated magnetic field signal.
[0029] Reference Figure 1 , Figure 2 and Figure 3The cover plate 7 has several guide grooves 71. The bottom of each guide groove 71 is connected to all the positioning holes 73 in the designated area (such as all the positioning holes 73 in the same row of the detection platform 1). The opening direction of the guide groove 71 satisfies that the magnet can be inserted into the positioning hole 73 connected to the guide groove 71 during the process of inserting the magnet into the guide groove 71 and sliding along the length of the guide groove 71. In practical applications, multiple magnet stacks arranged along the thickness direction are inserted into one end of the guide groove 71. Then, the magnet stacks are manually slid along the length of the guide groove 71 to the other end. During this process, the magnet stacks will sequentially pass through the positioning holes 73 connected to the guide groove 71. Each time a positioning hole 73 is passed, since the positioning hole 73 is located at the bottom of the guide groove 71, the magnet at the bottom of the magnet stack will be inserted into the positioning hole 73 under its own weight and the magnetic attraction of the magnetic attractor 72 inside the positioning hole 73, thus achieving automatic alignment between the magnet and the positioning hole 73. At this time, the current positioning hole 73 is filled by one magnet, so that the remaining magnet stack will continue to slide along the length of the guide groove 71 to the next positioning hole 73. Similarly, the magnet at the bottom of the magnet stack will fall into the positioning hole 73, until each magnet in the magnet stack is sequentially inserted into a positioning hole 73, thus achieving a one-to-one correspondence between the magnet and the positioning hole 73. In some embodiments, in order to facilitate the removal of the magnet from the positioning hole 73 after the test is completed, the total depth of the guide groove 71 and the positioning hole 73 connected to the bottom of the guide groove 71 can be less than the thickness of a single magnet, so that after the magnet is inserted into the positioning hole 73 through the guide groove 71, the magnet part protrudes outside the guide groove 71, so that the magnet can be removed from the positioning hole 73 by clamping the protruding part.
[0030] Reference Figure 2 and Figure 4 All detection units 3 are pre-divided into several detection groups. As shown in the figure, the four detection units 3 highlighted by the dotted line and pointed to by arrow A belong to one detection group. All detection units 3 belonging to the same detection group are electrically connected to a central control unit 4, which is a microcontroller pre-integrated on the PCB board 11. All central control units 4 are electrically connected to a main control unit 5, which can also be a microcontroller.
[0031] Reference Figure 2 and Figure 4The central control unit 4, based on a preset detection triggering rule, controls all detection units 3 directly electrically connected to it to detect the magnetic field strength of the geometric center point of the magnet within the corresponding positioning acupoint 73, and outputs an analog voltage signal proportional to the magnetic field strength. The output terminals of all detection units 3 belonging to the same detection group are connected to an analog-to-digital converter (ADC), which is electrically connected to the corresponding central control unit 4. The ADC converts the analog voltage signal output by the detection unit 3 into a digital value (i.e., an ADC value) and sends this digital value to the central control unit 4. The central control unit 4 uses this digital value as detection data and stores it in its memory. It should be noted that the central control unit 4 pre-stores the addresses of all detection units 3 electrically connected to it. When storing detection data, it establishes a correspondence between the detection data and the positioning acupoint 73 based on these addresses and stores this correspondence. Furthermore, each central control unit 4 controls the detection unit 3 to autonomously complete the control of the detection unit 3 and the acquisition and storage of detection data; its acquisition process does not require control by the main control unit 5. For example, the preset detection triggering rule can allow the central control unit 4 to control the detection unit 3 to detect the magnetic field strength in real time.
[0032] Reference Figure 2 and Figure 4 The main control unit 5 communicates with the central control unit 4 through a preset interface (such as an SPI interface) and performs data exchange during the communication process. For example, the main control unit 5 sends a data acquisition command to any of the central control units 4. Upon receiving the data acquisition command, the central control unit 4 sends the most recently stored detection data and its corresponding relationship to the main control unit 5. The main control unit 5 first corrects the detection data and then compares the corrected detection data with a preset qualified data range to determine whether the corrected detection data falls within the qualified data range. If it does, the detection result is qualified; otherwise, the detection result is unqualified.
[0033] Reference Figure 2 and Figure 4Correspondingly, the main control unit 5 is electrically connected to the status indicator 8 and the human-machine interaction unit 6. The status indicator 8 is set one-to-one with the positioning holes 73 and is integrated on the PCB board 11 near the corresponding positioning hole 73. In this embodiment, the status indicator 8 can be an LED light. The main control unit 5 is used to control the corresponding status indicator 8 to display according to the preset display state corresponding to the detection result based on the detection results determined by the magnets in different positioning holes 73. For example, when the detection result is qualified, the corresponding display state is green, and when the detection result is unqualified, the display state is red. In addition, the human-machine interaction unit 6 can be a touch screen (such as an HMI touch screen). The main control unit 5 is also used to control the touch screen to centrally display the detection data and corresponding detection results of all detection points 2. Thus, the detection results are fed back to the inspection personnel in two display methods: centralized display and local display near the positioning hole 73, which helps the inspection personnel to quickly locate the position of the unqualified magnet. The preset qualified data range mentioned above can also be entered and stored by the inspection personnel through the human-machine interaction unit 6.
[0034] The aforementioned operation of correcting the test data originates from a pre-executed correction process, which can be triggered by the testing personnel through the human-machine interface unit 6. For example, if the testing personnel taps a preset correction button on the display interface of the human-machine interface unit 6, the human-machine interface unit 6 will generate a correction command and send it to the main control unit 5. The main control unit 5 is used to initiate the correction process upon receiving the correction command. The correction process is as follows: Reference Figure 2 and Figure 4The main control unit 5 first determines the positioning points 73 to be calibrated as designated positioning points 73 based on all the positioning points 73 to be calibrated (e.g., all positioning points 73) and the preset calibration order of all the positioning points 73 to be calibrated. According to the position of the designated positioning points 73 on the detection platform 1 (e.g., the i-th row and j-th column), the human-machine interaction unit 6 generates and displays the first guidance information. The first guidance information is used to prompt the testing personnel to place a pre-prepared standard magnet with a known accurate magnetic field strength value into the designated positioning point 73. Accordingly, the specific content of the first guidance information includes at least the position information of the designated positioning point 73, such as "Please place a pre-prepared standard magnet with a known accurate magnetic field strength value into the positioning point 73 in the first row and first column". When the standard magnet is placed into the first designated positioning point 73 for the first time, the first guidance information may also include content to remind the testing personnel to enter the known accurate magnetic field strength value of the standard magnet. The human-machine interface unit 6 is used to take the known accurate intensity value entered by the inspector as the calibration value and send it to the main control unit 5. In addition, after the inspector places the standard magnet into the designated positioning acupoint 73, the human-machine interface unit 6 can also enter the information that the placement has been completed. When the human-machine interface unit 6 receives the information, it sends a response signal to the main control unit 5, thereby enabling the main control unit 5 to communicate with the central control unit 4 corresponding to the current designated positioning acupoint 73 and obtain the detection data corresponding to the designated positioning acupoint 73 obtained by the central control unit 4 at the current moment.
[0035] Reference Figure 2 and Figure 4 For each designated acupoint 73, the main control unit 5 performs the following steps: After obtaining the detection data corresponding to the designated acupoint 73, the main control unit 5 calculates the correction coefficient of the designated acupoint 73 using a preset algorithm. Specifically, the algorithm is expressed as: Correction coefficient = Calibration value / Detection data. The detection data is the data value obtained by the main control unit from the central control unit 4, directly detected by the detection unit 3, and then converted by the analog-to-digital converter. The main control unit 5 associates and stores the designated acupoint 73 with the corresponding calculated correction coefficient. Correspondingly, in the operation described above regarding "the main control unit 5 first corrects the detection data, then compares the corrected detection data with a preset qualified data range to determine whether the corrected detection data falls within the qualified data range," the main control unit 5's correction method for the detection data is as follows: The main control unit 5 determines the acupoint 73 associated with the detection data, and then calls the correction coefficient associated with that acupoint 73 to calculate the corrected detection data. Specifically: Corrected detection data = Detected data before correction * Correction coefficient.
[0036] Reference Figure 2 and Figure 4 Optionally, in a preferred embodiment of this application, the main control unit 5 also integrates an intelligent calibration decision function. This intelligent calibration decision function aims to enable the meter magnetic field testing device to autonomously monitor its own measurement stability and intelligently trigger the calibration process when a performance drift risk is identified, rather than relying solely on manual determination by testing personnel to determine when calibration is needed. This ensures the accuracy and reliability of long-term measurements. To achieve intelligent decision-making, the internal or preset external memory of the main control unit 5 is divided into two main areas: a historical testing database and a calibration decision model library.
[0037] Reference Figure 2 and Figure 4 After each routine test, the main control unit 5 not only outputs the test results but also stores a batch of complete test snapshots in the historical test database. Each test snapshot can contain the following key fields: test timestamp, acupoint number (i, j), original test data (i.e., the test data before correction mentioned above), corrected test data, ambient temperature (which can be preset with a temperature sensor for detection), and test result (pass / fail).
[0038] Reference Figure 2 and Figure 4 On the testing platform 1, a pre-designated positioning hole 73 is used as a benchmark positioning hole 73. A standard magnet with highly stable physical and magnetic properties and a known accurate magnetic field strength value will be permanently inserted into this benchmark positioning hole 73. That is, this benchmark positioning hole 73 will not participate in the testing of other magnets, but will always test the test data of this standard magnet. The main control unit 5 is used to automatically control the testing unit 3 corresponding to the benchmark positioning hole 73 to perform a test on the standard magnet once when the full magnetic field inspection device is powered on for the first time each day, or after each fixed number of tests (such as testing 1000 magnets in other positioning holes 73 besides the benchmark positioning hole 73). The test data obtained is used as the current reading of the standard magnet and stored. The main control unit 5 also stores the test data measured when the standard magnet was last started and the calibration process was completed (using it as the reference reading of the standard magnet).
[0039] Reference Figure 2 and Figure 4 The main control unit 5 contains correction decision logic, which periodically (e.g., every 100 tests) performs the following two analyses: The latest acquired standard magnet reading is compared with the standard magnet reference reading, and the relative deviation percentage is calculated as follows: Relative deviation percentage = |(Current standard magnet reading - Standard magnet reference reading)| / Standard magnet reference reading * 100%. If the relative deviation percentage exceeds the preset first-level deviation threshold (e.g., 5%), the first alarm is triggered. For each positioning point 73 (excluding the benchmark positioning point 73), the raw detection data of the qualified magnets detected in the most recent N tests (e.g., N=500) are extracted from the historical database and used as an analysis sample set. The mean μ_i and standard deviation σ_i are calculated for the analysis sample set of each positioning point 73. Simultaneously, the main control unit 5 stores the historical baseline mean (μ_i_base) and historical baseline standard deviation (σ_i_base) of each positioning point 73 during the stabilization period after the last calibration. In this embodiment, the stabilization period after calibration can be defined by meeting preset empirical conditions, such as the equipment running time exceeding a preset duration after calibration, and the number of qualified magnets collected from each positioning point 73 reaching a preset number.
[0040] Calculate |μ_i-μ_i_base| for each acupoint 73. If this value is greater than K1*σ_i_base (e.g., K1=3, i.e., the 3σ principle), then the corresponding acupoint 73 is considered to have experienced a significant mean shift, triggering the second alarm.
[0041] Evaluate the current standard deviation σ_i for each acupoint 73. If σ_i > K2*σ_i_base (e.g., K2=1.5), the measurement repeatability (accuracy) of the corresponding acupoint 73 is considered to have decreased, triggering a second alarm.
[0042] The main control unit 5 performs an "OR" logic judgment on the above analysis content: if an alarm is triggered or any positioning point 73 triggers a second alarm, a correction warning is triggered.
[0043] Once a calibration warning is triggered, the main control unit 5 controls the human-machine interface unit 6 to display a prompt message on the touch screen. The prompt message may read: "A measurement deviation has been detected. It is recommended to start the calibration process. Please confirm whether to continue?" This allows the testing personnel to choose whether to trigger the calibration command. If triggered, and the trigger source is the first alarm, the main control unit 5 controls the human-machine interface unit 6 to prompt: "Please confirm that the [standard magnet] is still located at positioning point 73 (X, Y) and click [Confirm]." Here, positioning point 73 (X, Y) refers to the position information of the benchmark positioning point 73. After the operator checks and confirms, they click Confirm. The main control unit 5 controls the measurement of the benchmark positioning point 73 and compares the reading with the standard magnet's reference reading as the current degree of the standard magnet. If the relative deviation percentage exceeds the preset first-level deviation threshold, the calibration process is directly initiated. Otherwise, it is determined to be accidental interference, and the magnetic field inspection device resumes normal testing.
[0044] The calibration process here is the same as described above (i.e., guiding the inspector to place the standard magnets sequentially into the designated positioning holes 73 and calculating the calibration coefficients) until the calibration process is complete. Finally, the main control unit 5 controls the human-machine interface unit 6 to display a prompt message on the touch screen, such as: "Calibration complete! New parameters have taken effect. Please keep the [standard magnet] in positioning hole 73 (X, Y)." After the inspector returns the standard magnet to its position, the main control unit 5 performs a measurement on the standard magnet, updates this reading to the new standard magnet reference reading, clears the historical detection database, restarts data accumulation, and returns to the ready state to begin a new round of magnet testing.
[0045] Reference Figure 2 , Figure 3 and Figure 4 In another embodiment, this application also provides a method for full inspection of magnetic stripe magnets, comprising the following steps: Multiple magnets stacked together along the thickness direction are inserted into one end of the guide groove 71 and slid along the length of the guide groove 71. During the sliding process, when the bottom magnet moves to the positioning hole 73 connected to the guide groove 71, it is inserted into the positioning hole 73 under its own weight and the magnetic attraction of the magnetic attractor 72, so that all the magnets are set in a one-to-one correspondence with the positioning holes 73 connected to the guide groove 71. The central control unit 4 controls the detection unit 3 to detect the magnetic field strength of the geometric center point of the magnet in each positioning acupoint 73, thereby obtaining and storing the detection data; The main control unit 5 communicates with each central control unit 4 to obtain the detection data of all detection points 2. Based on the correction coefficients pre-calibrated for each detection point 2, the main control unit 5 corrects the detection data and compares it with the preset qualified data range to finally obtain the detection results of each magnet. The main control unit 5 controls the human-machine interaction unit 6 and / or the status indicator 8 to provide feedback on the test results to the testing personnel.
[0046] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.
Claims
1. A magnetic stripe inspection device, characterized in that: The system includes a detection platform (1), which has several detection points (2). Each detection point (2) corresponds to a detection unit (3). Each detection point (2) has a positioning hole (73) for inserting a magnet. The positioning hole (73) can only accommodate a single magnet. When a magnet is inserted into the positioning hole (73), the geometric center of the magnet contacts the detection sensing point of the corresponding detection unit (3). The detection unit (3) is used to detect the magnetic field strength at the geometric center of the magnet in the positioning hole (73) using the detection sensing point.
2. The magnetic field testing device according to claim 1, characterized in that: Each of the positioning holes (73) is also provided with a magnetic attractor (72) for magnetic attraction with a magnet.
3. The magnetic field testing device according to claim 1 or 2, characterized in that: The detection platform (1) is provided with a guide groove (71) for inserting and sliding a magnet. The guide groove (71) is connected to a number of positioning holes (73). The opening direction of the guide groove (71) satisfies that the magnet can be inserted into the positioning hole (73) connected to the guide groove (71) during the process of inserting the magnet into the guide groove (71) and sliding along the opening direction of the guide groove (71).
4. The magnetic field testing device according to claim 1, characterized in that: All the detection units (3) are pre-divided into several detection groups. All detection units (3) belonging to the same detection group are electrically connected to a central control unit (4). All central control units (4) are electrically connected to a main control unit (5). Each of the central control units (4) is used to control the connected detection unit (3) to detect the magnet, and to acquire and store the detection data obtained from the detection; the main control unit (5) is used to communicate with the central control unit (4), acquire the detection data stored in the central control unit (4), and also to analyze the detection data to obtain the detection results and provide feedback on the detection results to the detection personnel.
5. The magnetic field testing device according to claim 4, characterized in that: The main control unit (5) is electrically connected to the human-machine interaction unit (6), and the main control unit is used to display the detection results corresponding to all detection points (2) to the detection personnel through the human-machine interaction unit (6); A status indicator (8) is provided on the detection platform (1) and near each detection point (2). The status indicator (8) is electrically connected to the main control unit (5). The main control unit (5) is used to provide feedback on the detection results to the detection personnel by controlling the display status of the status indicator (8).
6. The magnetic field testing device according to claim 5, characterized in that: The human-computer interaction unit (6) is also used to receive a calibration command triggered by the testing personnel and send the calibration command to the main control unit (5) so that the main control unit (5) can start the calibration process to obtain the calibration result. The human-computer interaction unit (6) is also used to receive guidance information generated by the main control unit (5) in the calibration process, and update and feed back the guidance information to the testing personnel in real time. The guidance information is used to remind the testing personnel to execute the guidance information to cooperate in completing the calibration process. The guidance information includes at least reminding the testing personnel to place the magnet into the designated positioning acupoint (73). The main control unit (5) is used to correct the detection data based on the correction result after the correction process is completed and when the detection data stored in the central control unit (4) is obtained, and then analyze the corrected detection data to obtain the detection result.
7. The magnetic field testing device according to claim 6, characterized in that: The correction process includes: The main control unit (5) controls the human-machine interaction unit (6) to provide guidance information to the testing personnel. The guidance information refers to prompting the testing personnel to place a standard magnet with a known accurate magnetic field strength value into the designated positioning point (73). The main control unit (5) is used to obtain the detection data of the magnet in the designated positioning acupoint (73) from the central control unit (4), and calculate the correction coefficient for the designated positioning acupoint (73) based on the preset algorithm, and use the correction coefficient as the correction result.
8. A method for full inspection of magnetic field strength, applied to the full inspection device for magnetic field strength as described in claim 7, characterized in that, Includes the following steps: Multiple magnets stacked together along the thickness direction are inserted into one end of the guide groove (71) and slid along the length of the guide groove (71). During the sliding process, when the bottom magnet moves to the positioning hole (73) connected to the guide groove (71), it is inserted into the positioning hole (73) under its own weight and the magnetic attraction of the magnetic attractor (72), so that all the magnets are set one-to-one with the positioning holes (73) connected to the guide groove (71). The central control unit (4) controls the detection unit (3) to detect the magnetic field strength of the geometric center point of the magnet in each positioning hole (73), thereby obtaining and storing the detection data; The main control unit (5) communicates with each central control unit (4) to obtain the detection data of all detection points (2). The main control unit (5) corrects the detection data based on the correction coefficients pre-calibrated for each detection point (2), and then compares it with the preset qualified data range to finally obtain the detection results of each magnet. The main control unit (5) controls the human-machine interaction unit (6) and / or the status indicator (8) to provide feedback on the test results to the testing personnel.