A surface defect detection device and method for AC electrode foil production

Abstract

The application discloses a surface defect detection device and method for AC electrode foil production, and relates to the technical field of electrode foil detection.The device comprises a detection box and an AC electrode foil, and a high-resolution camera is arranged on one side of the upper end of the detection box.Two moving mechanisms are symmetrically arranged on the upper end of the detection box.The AC electrode foil is stretched by the rolling shaft, which can effectively remove the wrinkles and relaxation on the surface of the material, ensure that the electrode foil is in a flat state, and make the internal stress of the electrode foil more uniform, so that false signals or actual defects caused by local stress concentration are avoided.The design of the triangular stretching assembly enables the AC electrode foil to be stretched in different directions, thereby realizing multi-angle and multi-direction detection.Combined with the differential eddy current probe group, the double-frequency eddy current probe group and the eddy current arrangement probe group, the electrode foil can be comprehensively detected from multiple dimensions.

Description

Technical Field

[0001] This invention relates to the technical field of electrode foil inspection, and in particular to a surface defect inspection device and method for AC electrode foil production. Background Technology

[0002] For example, CN119354987A, entitled "A Surface Defect Detection Device and Detection Method for Electrode Foil Production," describes an invention in which the electrode foil is brought into contact with the heated outer surface of the mounting shell during transport and preheated by heat transfer. This preheating process causes slight changes in the electrode foil material due to thermal expansion, making internal defects more apparent. The increased visibility of defects helps subsequent detection steps to more accurately identify and locate them, thereby improving the accuracy and reliability of the detection. The preheated electrode foil is also more likely to be detected by the inspection agency, reducing missed or false detections caused by inconspicuous defects.

[0003] During the transport and inspection of AC electrode foil, uneven internal stress distribution can lead to localized stress concentrations, causing false signals or actual defects and affecting the reliability of inspection results. Furthermore, structural changes within or deep within the electrode foil, such as cracks and holes, are difficult to detect through simple visual inspection. In particular, the detection performance of planar AC electrode foil differs significantly from that of electrode foil at curved angles. Planar inspection methods are limited and cannot comprehensively cover all potential defects. Therefore, this application provides an optimized surface defect inspection device and method for AC electrode foil production to meet these complex inspection requirements and improve the accuracy and reliability of inspection results. Summary of the Invention

[0004] The purpose of this application is to provide a surface defect detection device and method for AC electrode foil production, which can effectively solve the problems mentioned in the background art.

[0005] To achieve the above objectives, this application provides the following technical solution: a surface defect detection device for AC electrode foil production, comprising a detection box and an AC electrode foil, wherein a high-resolution camera is provided on one side of the upper end of the detection box, and two moving mechanisms are symmetrically arranged on the upper end of the detection box, wherein an eddy current detection mechanism is provided between the two moving mechanisms to stretch the AC electrode foil and use eddy current to detect the AC electrode foil, wherein a curved surface supplementary light source is provided above the eddy current detection mechanism to detect the extended part of the AC electrode foil, and a laser detection mechanism is provided inside the detection box and below the eddy current detection mechanism to detect the inclined surface of the AC electrode foil using laser.

[0006] The eddy current testing includes a triangular tensile assembly installed between two moving mechanisms to perform tensile testing on the AC electrode foil. One side of the triangular tensile assembly is equipped with a differential eddy current probe group for deep testing of the AC electrode foil. Another side of the triangular tensile assembly is equipped with a dual-frequency eddy current probe group for comprehensive testing of the AC electrode foil. The interior of the triangular tensile assembly is equipped with an eddy current array probe group that works in conjunction with the dual-frequency eddy current probe group to detect defects on both sides of the AC electrode foil.

[0007] The triangular stretching assembly includes a triangular shell, which is triangular in shape. A primary roller and a secondary roller are rotatably mounted on the bottom of the triangular shell. A top opening is provided on the upper part of the outer surface of the triangular shell. A stretching wheel is rotatably mounted on the inner wall of the triangular shell at the position of the top opening. A support block is provided on one side of the triangular shell, and an installation groove is provided on one side of the triangular shell.

[0008] The moving mechanism includes a fixed frame, which is installed on the upper end of the detection box. A slide bar is provided on one side, and a slider is slidably installed inside the slide bar. An electrical connecting chain is provided on the upper end of the slider, and a triangular shell is installed on one side of the slider.

[0009] The differential eddy current probe group includes a mounting frame, which is installed inside a mounting groove. Inside the mounting frame, there are several support frames arranged in a rectangular array, and inside each support frame, there are two adjacent and tightly coupled coil excitation coils and detection coils.

[0010] The dual-frequency eddy current probe group includes a fixed frame, which is installed inside the triangular shell and located on one side of the initial roller. Several fans are provided on one side of the fixed frame, and an air guide shell is provided on the other side of the fixed frame to guide the airflow into and out of the top opening. Several hole spacing frames distributed in a rectangular array are provided at the bottom of the fixed frame, and an outer coil and an inner coil are provided inside the hole spacing frame. The outer coil is sleeved outside the inner coil.

[0011] The eddy current array probe group includes a square frame, which is installed on the inner wall of the triangular shell. The inner wall of the square frame is provided with a number of coil frames arranged in a rectangular array. The inside of the tension wheel is provided with a surface detection coil, and the position of the surface detection coil corresponds to the position of the outer coil.

[0012] The laser detection mechanism includes a support frame, which is installed on the upper part of the inner wall of the detection box. A refracting lamp head is provided at the upper end of the support frame, a laser receiver is provided on one side of the refracting lamp head, a zigzag device is provided at the bottom of the refracting lamp head, and a laser generator is provided on one side of the zigzag device.

[0013] The curved surface supplementary lighting detection mechanism includes a curved frame, which is installed on the upper end of the air guide shell and the support block. An elliptical curved surface cover is provided on the inner wall of the curved frame, and a detection head is provided on the upper part of the inner wall of the elliptical curved surface cover.

[0014] The elliptical curved surface is located above the stretching wheel, and the inner wall of the elliptical curved surface is provided with a number of LED beads.

[0015] This invention also provides a method for detecting surface defects in the production of AC electrode foil, the specific detection method being as follows:

[0016] Step 1: The AC electrode foil is fed and wound inside the triangular stretching assembly. The triangular stretching assembly stretches the AC electrode foil through the wound rollers. The moving mechanism can reciprocate to drive the triangular stretching assembly to move, so that the AC electrode foil fed inside the triangular stretching assembly stretches while the triangular stretching assembly is reciprocating.

[0017] Step 2: The AC electrode foil wound inside the triangular tensioning assembly is first subjected to eddy current testing by a dual-frequency eddy current probe group. The dual-frequency eddy current probe group is equipped with coils of two frequencies, which are used to perform surface and deep testing on the AC electrode foil respectively. Moreover, the heat generated by the coils inside the dual-frequency eddy current probe group will be dissipated through the air duct and blown onto the surface of the AC electrode foil.

[0018] Step 3: The heat from the dual-frequency eddy current probe is blown onto the surface of the AC electrode foil to preheat it. The preheated AC electrode foil is then transferred to the area below the curved surface supplementary lighting detection mechanism. The curved surface supplementary lighting detection mechanism is located above the triangular tensioning component. Because the triangular tensioning component is triangular in shape, the curved surface supplementary lighting detection mechanism provides comprehensive supplementary lighting to the AC electrode foil wrapped around the roller surface, thereby detecting visual defects in the AC electrode foil at the curved surface angle.

[0019] Step 4: When the AC electrode foil is subjected to eddy current detection by the dual-frequency eddy current probe group, the set eddy current array probe group performs eddy current detection on the lower surface of the AC electrode foil. Moreover, the eddy current array probe group, together with the dual-frequency eddy current probe group, can perform surface detection on the upper and lower surfaces of the AC electrode foil at the same time.

[0020] Step 5: After being inspected by the curved surface supplementary lighting detection mechanism, the AC electrode foil is transported to the interior of the differential eddy current probe group. The differential eddy current probe group can perform comprehensive deep inspection of the AC electrode foil. The laser detection mechanism is located directly below the triangular stretching assembly, which guides the AC electrode foil to travel along a triangular path. This ensures that when the laser detection mechanism inspects the surface of the AC electrode foil, the laser shines on the tilted surface of the AC electrode foil. As the triangular stretching assembly moves, the angle at which the laser detection mechanism inspects the surface of the AC electrode foil also changes. Finally, the AC electrode foil transported from the triangular stretching assembly is inspected again by a high-resolution camera.

[0021] In summary, the technical effects and advantages of this invention are as follows:

[0022] 1. This invention stretches the AC electrode foil by winding a roller, which can effectively remove wrinkles and looseness on the material surface, ensuring that the electrode foil is in a flat state. Stretching can make the internal stress of the electrode foil more uniform, avoiding false signals or actual defects caused by local stress concentration. The design of the triangular stretching component allows the AC electrode foil to be stretched in different directions, thereby realizing multi-angle and multi-directional detection. Combined with differential eddy current probe group, dual-frequency eddy current probe group and eddy current arrangement probe group, the electrode foil can be comprehensively detected from multiple dimensions.

[0023] 2. The combination of the dual-frequency eddy current probe group in this invention can simultaneously acquire surface and deep information in a single detection process. The dual-frequency eddy current probe group generates a certain amount of heat when working. The heat is dissipated through the air duct and blown directly onto the surface of the AC electrode foil. Appropriate heating can help remove moisture or volatile contaminants from the surface of the electrode foil, making the surface cleaner. The conductivity and magnetic permeability of the material make certain types of defects easier to detect. Moreover, heating can help release the stress accumulated inside the AC electrode foil, reducing false signals or actual defects caused by stress concentration.

[0024] 3. In this invention, the heat generated by the dual-frequency eddy current probe group is used to preheat the electrode foil, which can effectively remove moisture or other volatile contaminants from the surface of the electrode foil, making the surface cleaner and reducing misjudgments caused by water vapor condensation or contaminants. Since the triangular stretching component is triangular in shape, the curved surface supplementary lighting detection mechanism can provide comprehensive supplementary lighting for the AC electrode foil wrapped around its roller surface, ensuring that even at curved surface angles, the electrode foil surface can obtain uniform lighting conditions, thereby improving the effect of visual inspection.

[0025] 4. This invention uses a dual-frequency eddy current probe group to detect the upper surface, while an eddy current array probe group detects the lower surface, enabling simultaneous detection of both the upper and lower surfaces of the AC electrode foil. Combining high-frequency and low-frequency eddy current detection technologies, information can be obtained from different depth levels. The high-frequency coil focuses on surface defect detection, while the low-frequency coil is used to detect defects in deeper layers or on the lower surface. The dual-frequency eddy current probe group combines the advantages of high-frequency and low-frequency eddy current detection, enabling the detection of both surface defects and changes in deep structures. The eddy current array probe group is specifically designed to detect defects on the lower surface of the electrode foil, further improving the comprehensiveness and depth of the detection. For example, scratches and holes, which are typically located on the surface layer of the electrode foil, can be efficiently detected using the eddy current array probe group.

[0026] 5. The differential eddy current probe assembly in this invention enables comprehensive deep inspection of the electrode foil. Due to its differential configuration, it is highly sensitive to local changes and suitable for detecting minute defects or internal material variations. Unlike dual-frequency eddy current probe assemblies and eddy current array probe assemblies, the differential eddy current probe assembly focuses on detecting more subtle and localized deep defects, ensuring a detailed inspection of the internal structure of the AC electrode foil. Furthermore, because the triangular stretching assembly guides the AC electrode foil along a triangular path, the laser of the laser inspection mechanism irradiates the inclined surface of the AC electrode foil, and the angle changes as the assembly moves. This allows for inspection of the electrode foil surface from multiple angles, improving the comprehensiveness and accuracy of the inspection. For AC electrode foils with complex geometries, the inspection of the inclined surface helps capture more details. Finally, the high-resolution camera provides high-resolution images of the electrode foil surface, helping to capture minute surface defects and features. Attached Figure Description

[0027] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0028] Figure 1 A three-dimensional structural diagram of a surface defect detection device for AC electrode foil production;

[0029] Figure 2 A first-view, three-dimensional schematic diagram of the internal structure of a surface defect detection device for AC electrode foil production.

[0030] Figure 3 A second-view, three-dimensional schematic diagram of the internal structure of a surface defect detection device for AC electrode foil production.

[0031] Figure 4A third-view internal three-dimensional structural diagram of a surface defect detection device for AC electrode foil production.

[0032] Figure 5 A partial three-dimensional connection structure diagram for a first-person perspective internal three-dimensional structure diagram;

[0033] Figure 6 A first-person perspective three-dimensional connection structure diagram of the laser detection mechanism;

[0034] Figure 7 A schematic diagram of the second-view three-dimensional connection structure of the laser detection mechanism;

[0035] Figure 8 A diagram showing the positional relationship between the laser detection mechanism and the eddy current detection mechanism;

[0036] Figure 9 A schematic diagram of the three-dimensional connection structure between the moving mechanism and the eddy current detection.

[0037] Figure 10 This is a schematic diagram of the three-dimensional connection structure of the moving mechanism;

[0038] Figure 11 A schematic diagram of the three-dimensional connection structure of the differential eddy current probe group, the triangular tension component, and the dual-frequency eddy current probe group;

[0039] Figure 12 A schematic diagram of the three-dimensional connection structure between the differential eddy current probe group and the curved surface supplementary lighting detection mechanism;

[0040] Figure 13 A schematic diagram of the three-dimensional connection structure of the dual-frequency eddy current probe group, the differential eddy current probe group, and the triangular tension assembly;

[0041] Figure 14 This is a three-dimensional sectional view of the connection structure of the triangular tension assembly.

[0042] Figure 15 A schematic diagram of the three-dimensional connection structure of the triangular stretching assembly and the AC electrode foil;

[0043] Figure 16 A schematic diagram of the three-dimensional connection structure of a dual-frequency eddy current probe group;

[0044] Figure 17 A schematic diagram of the three-dimensional connection structure of the vortex-arranged probe group;

[0045] Figure 18 A schematic diagram of the three-dimensional connection structure of the differential eddy current probe group;

[0046] Figure 19 A schematic diagram of the three-dimensional connection structure of the curved surface supplementary lighting detection mechanism;

[0047] Figure 20This is a three-dimensional cross-sectional view of the connection structure of the curved surface supplementary lighting detection mechanism.

[0048] In the diagram: 1. Detection box; 2. AC electrode foil; 3. High-resolution camera; 4. Moving mechanism; 41. Fixing frame; 42. Slide bar; 43. Slider; 44. Electrical connection chain; 5. Eddy current detection; 51. Differential eddy current probe assembly; 511. Mounting frame; 512. Support frame; 513. Excitation coil; 514. Detection coil; 52. Triangular tension assembly; 521. Primary roller; 522. Triangular shell; 523. Top opening; 524. Tensioning wheel; 525. Secondary roller; 526. Support block; 527. Mounting groove; 53. Dual-frequency eddy current probe assembly; 531, fixed frame; 532, air guide shell; 533, fan; 534, hole spacing frame; 535, outer coil; 536, inner coil; 54, eddy current array probe assembly; 541, square frame; 542, coil frame; 543, surface detection coil; 6, curved surface supplementary lighting detection mechanism; 61, curved frame; 62, elliptical curved surface cover; 63, detection head; 64, lamp bead; 7, laser detection mechanism; 71, support frame; 72, laser generator; 73, refraction lamp head; 74, laser receiver; 75, zigzag. Detailed Implementation

[0049] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0050] Example 1, Reference Figures 1 to 20 The surface defect detection device for AC electrode foil production shown includes a detection box 1 and an AC electrode foil 2. A high-resolution camera 3 is installed on one side of the upper end of the detection box 1. Two moving mechanisms 4 are symmetrically arranged on the upper end of the detection box 1. An eddy current detection 5 is arranged between the two moving mechanisms 4 to stretch the AC electrode foil 2 and use eddy current to detect the AC electrode foil 2. A curved surface supplementary light detection mechanism 6 is arranged above the eddy current detection 5 to detect the curved surface of the extended part of the AC electrode foil 2. Inside the detection box 1 and below the eddy current detection 5, a laser detection mechanism 7 is arranged to detect the inclined surface of the AC electrode foil 2 using laser.

[0051] The eddy current testing 5 includes a triangular tensile assembly 52 installed between two moving mechanisms 4 to perform tensile testing on the AC electrode foil 2. A differential eddy current probe group 51 for deep testing of the AC electrode foil 2 is provided on one side of the triangular tensile assembly 52. ​​A dual-frequency eddy current probe group 53 for comprehensive testing of the AC electrode foil 2 is provided on one side of the triangular tensile assembly 52. ​​An eddy current array probe group 54 is provided inside the triangular tensile assembly 52 to cooperate with the dual-frequency eddy current probe group 53 to detect defects on both sides of the AC electrode foil 2.

[0052] It is worth noting that the AC electrode foil 2 is conveyed and wound inside the triangular stretching assembly 52, and the triangular stretching assembly 52 stretches the AC electrode foil 2 through the wound roller. The moving mechanism 4 can reciprocate to drive the triangular stretching assembly 52 to move, so that the AC electrode foil 2 conveyed inside the triangular stretching assembly 52 is stretched while the triangular stretching assembly 52 is reciprocating.

[0053] The AC electrode foil is stretched by a roller, which can effectively remove wrinkles and looseness on the material surface and ensure that the electrode foil is flat. The stretching can make the internal stress of the electrode foil more uniform and avoid false signals or actual defects caused by local stress concentration. The design of the triangular stretching component 52 allows the AC electrode foil to be stretched in different directions, thereby realizing multi-angle and multi-directional detection. Combined with the differential eddy current probe group 51, the dual-frequency eddy current probe group 53 and the eddy current arrangement probe group 54, the electrode foil can be comprehensively detected from multiple dimensions.

[0054] The AC electrode foil 2 wound inside the triangular tension assembly 52 first undergoes eddy current detection through the dual-frequency eddy current probe group 53. The dual-frequency eddy current probe group 53 is equipped with coils of two frequencies, which perform surface and deep detection on the AC electrode foil 2 respectively. Moreover, the heat generated by the coil inside the dual-frequency eddy current probe group 53 will be dissipated through the air duct and blown onto the surface of the AC electrode foil 2.

[0055] Among them, the high-frequency coil is mainly used to detect surface defects of the electrode foil. Due to the skin effect, the high-frequency current is mainly concentrated near the material surface, which can provide high-resolution surface information. The low-frequency coil penetrates deeper and can detect defects inside or near the surface of the electrode foil, such as cracks or changes inside the material. The combination of the dual-frequency eddy current probe group 53 can acquire surface and deep information in one detection process. The dual-frequency eddy current probe group 53 generates a certain amount of heat when it is working. The heat is dissipated through the air duct and blown directly onto the surface of the AC electrode foil 2. Appropriate heating can help remove moisture or volatile contaminants from the surface of the electrode foil, making the surface cleaner. The conductivity and magnetic permeability of the material make certain types of defects easier to detect. Moreover, heating can help release the stress accumulated inside the AC electrode foil 2, reducing false signals or actual defects caused by stress concentration.

[0056] The heat dissipated by the dual-frequency eddy current probe group 53 is blown onto the surface of the AC electrode foil 2 to preheat the AC electrode foil 2. The preheated AC electrode foil 2 is then transferred to the lower part of the curved surface supplementary lighting detection mechanism 6. The curved surface supplementary lighting detection mechanism 6 is located above the triangular tensioning component 52. Because the triangular tensioning component 52 is triangular in shape, the curved surface supplementary lighting detection mechanism 6 provides comprehensive supplementary lighting to the AC electrode foil 2 wrapped around the roller surface, thereby detecting visual defects in the AC electrode foil 2 located at the curved surface angle.

[0057] The heat generated by the dual-frequency eddy current probe group 53 preheats the electrode foil, which can effectively remove moisture or other volatile pollutants from the surface of the electrode foil, making the surface cleaner and reducing misjudgments caused by water vapor condensation or pollutants. Since the triangular stretching component 52 is triangular in shape, the curved surface supplementary lighting detection mechanism 6 can provide comprehensive supplementary lighting for the AC electrode foil 2 wrapped around its roller surface, ensuring that the electrode foil surface can obtain uniform lighting conditions even at curved surface angles, thereby improving the effect of visual inspection.

[0058] When the AC electrode foil 2 is subjected to eddy current detection by the dual-frequency eddy current probe group 53, the eddy current array probe group 54 is set to perform eddy current detection on the lower surface of the AC electrode foil 2. Moreover, the eddy current array probe group 54, together with the dual-frequency eddy current probe group 53, can perform surface detection on the upper and lower surfaces of the AC electrode foil 2 at the same time.

[0059] The upper surface is detected by the dual-frequency eddy current probe group 53, while the lower surface is detected by the eddy current array probe group 54. This allows for simultaneous detection of both the upper and lower surfaces of the AC electrode foil 2. By combining high-frequency and low-frequency eddy current detection technologies, information can be obtained from different depth levels. The high-frequency coil focuses on surface defect detection, while the low-frequency coil is used to detect defects in deeper or lower surfaces.

[0060] The dual-frequency eddy current probe group 53 combines the advantages of high-frequency and low-frequency eddy current detection, enabling it to detect both surface defects and changes in deep structures. The eddy current array probe group 54 is specifically designed to detect defects on the lower surface of the electrode foil, further improving the comprehensiveness and depth of detection, such as scratches and holes. These defects are usually located on the surface layer of the electrode foil and can be efficiently detected by the eddy current array probe group 54.

[0061] After being inspected by the curved surface supplementary lighting detection mechanism 6, the AC electrode foil 2 is transported to the interior of the differential eddy current probe group 51. The differential eddy current probe group 51 can perform comprehensive deep inspection of the AC electrode foil 2. The laser detection mechanism 7 is located directly below the triangular stretching component 52. The triangular stretching component 52 guides the transport trajectory of the AC electrode foil 2 to a triangular path, so that when the laser detection mechanism 7 uses laser to inspect the surface of the AC electrode foil 2, the laser shines on the inclined surface of the AC electrode foil 2. As the triangular stretching component 52 moves, the angle at which the laser detection mechanism 7 inspects the surface of the AC electrode foil 2 will also change. Finally, the AC electrode foil 2 transported out from the triangular stretching component 52 will be inspected again by the high-resolution camera 3.

[0062] Among them, the differential eddy current probe group 51 can perform comprehensive deep inspection of the electrode foil. Due to its differential configuration, it is very sensitive to local changes and is suitable for detecting minute defects or changes inside the material. Unlike the dual-frequency eddy current probe group 53 and the eddy current array probe group 54, the differential eddy current probe group 51 focuses on detecting more subtle and local deep defects, ensuring a detailed inspection of the internal structure of the AC electrode foil 2.

[0063] Furthermore, since the triangular stretching component 52 guides the AC electrode foil 2 to be transported along the triangular path, the laser of the laser detection mechanism 7 irradiates the inclined surface of the AC electrode foil 2 and changes the angle as the component moves, which can realize the detection of the electrode foil surface from multiple angles, improving the comprehensiveness and accuracy of the detection. For the AC electrode foil 2 with complex geometry, the detection of the inclined surface helps to capture more details. Finally, the high-resolution camera 3 can provide high-resolution images of the electrode foil surface, helping to capture tiny surface defects and features.

[0064] Example 2: Based on the triangular tensioning component 52 and the moving mechanism 4 proposed in Example 1, this example provides a further technical solution for the triangular tensioning component 52 and the moving mechanism 4.

[0065] The triangular stretching assembly 52 includes a triangular shell 522, which is triangular in shape. A primary roller 521 and a secondary roller 525 are rotatably mounted on the bottom of the triangular shell 522. A top opening 523 is provided on the upper part of the outer surface of the triangular shell 522. A stretching wheel 524 is rotatably mounted on the inner wall of the triangular shell 522 at the position of the top opening 523. A support block 526 is provided on one side of the triangular shell 522, and an installation groove 527 is provided on one side of the triangular shell 522.

[0066] It is worth noting that the AC electrode foil 2 is wound around the surface of the stretching roller 524 by the guidance of the primary roller 521, and then the AC electrode foil 2 is wound around the surface of the secondary roller 525 and then transmitted out. The AC electrode foil 2 is conveyed in a triangular path after being guided by the primary roller 521, the stretching roller 524 and the secondary roller 525.

[0067] The moving mechanism 4 includes a fixed frame 41, which is installed on the upper end of the detection box 1. A slide bar 42 is provided on one side, and a slider 43 is slidably installed inside the slide bar 42. An electrical connecting chain 44 is provided on the upper end of the slider 43, and a triangular shell 522 is installed on one side of the slider 43.

[0068] The slider 43 drives the triangular shell 522 to move back and forth along the path guided by the slide bar 42. The electrical connection chain 44 provides power to the slider 43 and the equipment inside the eddy current detection 5. The slider 43 moves slowly, and the movement speed of the slider 43 inside the slide bar 42 is adjusted according to the tensile strength of the AC electrode foil 2.

[0069] Guided by the initial roller 521, stretching roller 524, and auxiliary roller 525, the AC electrode foil 2 is uniformly stretched during its transport along the triangular path, removing wrinkles and looseness from the material surface and ensuring its flatness. The slider 43 adjusts its movement speed on the slide bar 42 according to the tensile strength of the AC electrode foil 2, ensuring that the material maintains appropriate tension throughout the detection process and avoiding overstretching or loosening. Through the design of the initial roller 521, stretching roller 524, and auxiliary roller 525, the AC electrode foil 2 forms a stable triangular transport path, which not only helps maintain the flatness of the material but also ensures its stability during transport, reducing detection errors caused by material deformation.

[0070] Since the slider 43 adjusts its moving speed according to the tensile strength of the AC electrode foil 2, it ensures that the lift-off distance between the AC electrode foil 2 and the eddy current probe remains constant.

[0071] Example 3: Based on the dual-frequency eddy current probe group 53 and eddy current array probe group 54 proposed in Example 1, this example provides further technical solutions for the dual-frequency eddy current probe group 53 and eddy current array probe group 54.

[0072] The dual-frequency eddy current probe group 53 includes a fixed frame 531, which is installed inside the triangular shell 522 and located on one side of the initial roller 521. Several fans 533 are provided on one side of the fixed frame 531, and an air guide shell 532 is provided on the other side of the fixed frame 531 to guide the airflow into and out of the top opening 523. Several hole spacing frames 534 arranged in a rectangular array are provided at the bottom of the fixed frame 531, and an outer coil 535 and an inner coil 536 are provided inside the hole spacing frame 534, with the outer coil 535 sleeved on the outside of the inner coil 536.

[0073] It is worth noting that when inspecting the AC electrode foil 2 inside the triangular shell 522, the inner coil 536 uses a low-frequency current that can penetrate deeper material layers to detect defects inside or deep within the material. The low-frequency eddy current of the inner coil 536 has a large penetration depth and can detect deep areas several millimeters below the surface of the AC electrode foil 2. On the other hand, the outer coil 535 uses a high-frequency current that mainly flows near the surface of the AC electrode foil 2. The high-frequency eddy current has a shallower penetration depth and can provide higher spatial resolution, mainly detecting minute surface cracks, scratches and other minor defects on the AC electrode foil 2.

[0074] The fan 533 continuously blows air into the fixed frame 531 to dissipate heat from the inner coil 536 and the outer coil 535. The air blown out by the fixed frame 531 enters the air guide shell 532 and is then blown onto the surface of the AC electrode foil 2 after being guided by the air guide shell 532. This mainly cleans the surface of the AC electrode foil 2, and the heat generated by the inner coil 536 and the outer coil 535 also preheats the surface of the AC electrode foil 2, thus facilitating the subsequent detection by the curved surface supplementary lighting detection mechanism 6.

[0075] Among them, the low-frequency current of the inner coil 536 can penetrate deeper material layers to detect defects inside or deep within the material. Its large penetration depth can detect deep areas several millimeters below the surface of the AC electrode foil 2, ensuring effective detection of deep defects.

[0076] The high-frequency current of the 535 high-frequency external coil is mainly concentrated near the surface of the electrode foil, providing higher spatial resolution. It is mainly used to detect minute defects such as tiny surface cracks and scratches. The high-frequency eddy current has a shallow penetration depth, but it can capture surface details.

[0077] By combining low-frequency and high-frequency eddy current detection technologies, surface and deep information can be obtained simultaneously in a single inspection, improving the comprehensiveness and accuracy of the inspection. The low-frequency inner coil 536 is sensitive to deep defects, while the high-frequency outer coil 535 is sensitive to surface details. The combination of the two can detect more types of defects.

[0078] Meanwhile, the fan 533 continuously blows air into the fixed frame 531 to dissipate heat from the inner coil 536 and the outer coil 535, preventing overheating from affecting the detection performance. This heat is guided to the surface of the AC electrode foil 2 for preheating. The air guided by the fan 533 enters the air guide shell 532 and then blows onto the surface of the electrode foil, ensuring a uniform heating effect, removing surface moisture and volatile contaminants, and reducing misjudgments caused by water vapor condensation.

[0079] The eddy current array probe group 54 includes a square frame 541, which is installed on the inner wall of the triangular shell 522. The inner wall of the square frame 541 is provided with a number of coil frames 542 arranged in a rectangular array. The inside of the tension wheel 524 is provided with a surface detection coil 543, and the position of the surface detection coil 543 corresponds to the position of the outer coil 535.

[0080] When the upper surface of the AC electrode foil 2 is detected by the outer coil 535, the surface detection coil 543 is a high-frequency anti-eddy current coil used to detect the lower surface of the AC electrode foil 2. Moreover, the fact that the surface detection coil 543 is a high-frequency anti-eddy current coil does not affect the normal operation of the inner coil 536 and the outer coil 535.

[0081] The upper surface is detected by the outer coil 535, while the lower surface is detected by the surface detection coil 543, which enables simultaneous detection of both the upper and lower surfaces of the electrode foil. By combining high-frequency and low-frequency eddy current detection technologies, information can be obtained from different depth levels. The high-frequency outer coil 535 focuses on detecting minute defects on the upper surface, while the surface detection coil 543 is used for detection on the lower surface, ensuring comprehensive information coverage.

[0082] The inner coil 536 uses low-frequency current for deep detection, which can detect defects inside or deep within the electrode foil. The high-frequency outer coil 535 and the surface detection coil 543 detect minute defects on the upper and lower surfaces, respectively. This combination can acquire information from both the surface and the deep layers in a single detection process, thus improving the accuracy of the detection.

[0083] Example 4: Based on the differential eddy current probe group 51 proposed in Example 1, this example provides a further technical solution for the differential eddy current probe group 51.

[0084] The differential eddy current probe group 51 includes a mounting frame 511, which is installed inside the mounting groove 527. Inside the mounting frame 511, there are several support frames 512 arranged in a rectangular array. Inside each support frame 512, there are two adjacent and tightly coupled coil excitation coils 513 and detection coils 514.

[0085] It is worth noting that when the AC electrode foil 2 is moved below the mounting frame 511, the excitation coil 513 and the detection coil 514 are set to detect local changes in the AC electrode foil 2 based on the signal difference between the two coils, and to detect surface defects such as cracks and holes.

[0086] The differential configuration consisting of excitation coil 513 and detection coil 514 is highly sensitive to local changes and can accurately capture minute changes on the electrode foil surface, such as cracks or holes. Moreover, the alternating magnetic field generated by excitation coil 513 interacts with detection coil 514 to form a uniform magnetic field environment, reducing detection errors caused by magnetic field inhomogeneity.

[0087] Example 5: Based on the curved surface supplementary lighting detection mechanism 6 proposed in Example 1, this example provides an improved technical solution for the curved surface supplementary lighting detection mechanism 6.

[0088] The curved surface supplementary lighting detection mechanism 6 includes a curved frame 61, which is installed on the upper end of the air guide shell 532 and the support block 526. An elliptical curved surface cover 62 is provided on the inner wall of the curved frame 61, and a detection head 63 is provided on the upper part of the inner wall of the elliptical curved surface cover 62.

[0089] The elliptical curved mask 62 is located above the stretching wheel 524, and the inner wall of the elliptical curved mask 62 is provided with a number of LED beads 64.

[0090] It is worth noting that when the AC electrode foil 2 moves to the position of the top opening 523, the AC electrode foil 2 is wound around the surface of the stretching wheel 524. The LED beads 64 set on the inner wall of the elliptical curved mask 62 provide supplementary lighting for the AC electrode foil 2 on the curved surface. Because the AC electrode foil 2 is stretched by the stretching wheel 524, it is easier to detect surface defects of the AC electrode foil 2 wound around the surface of the stretching wheel 524. Furthermore, the AC electrode foil 2 is pre-treated by the air guide shell 532 before being wound around the surface of the stretching wheel 524, making surface defects of the AC electrode foil 2 more easily visible. The detection head 63 performs visual inspection of the AC electrode foil 2 on the curved surface, while the elliptical curved mask 62 is positioned to provide illumination. Figure 19 and Figure 20 The shape shown allows for comprehensive illumination of the curved AC electrode foil 2.

[0091] When the AC electrode foil 2 is wound around the stretching wheel 524, it is stretched, making the material flatter. The LED beads 64 on the inner wall of the elliptical curved mask 62 can provide comprehensive supplementary lighting to the electrode foil on the curved surface, providing uniform lighting conditions and resulting in higher image quality. The design of the elliptical curved mask 62 can provide comprehensive supplementary lighting to the electrode foil on the curved surface, ensuring that the surface at all angles can be fully covered by light, reducing the detection blind zone. The electrode foil is transported through the triangular path formed by the primary roller 521, the stretching wheel 524 and the secondary roller 525, enabling the detection head 63 to perform comprehensive detection at different angles and adapt to electrode foils with complex geometries.

[0092] Example 6: Based on the laser detection mechanism 7 proposed in Example 1, this example provides a further technical solution for the laser detection mechanism 7.

[0093] The laser detection mechanism 7 includes a support frame 71, which is installed on the upper part of the inner wall of the detection box 1. A refraction lamp head 73 is provided at the upper end of the support frame 71. A laser receiver 74 is provided on one side of the refraction lamp head 73. A zigzag device 75 is provided at the bottom of the refraction lamp head 73. A laser generator 72 is provided on one side of the zigzag device 75.

[0094] It is worth noting that the laser generator 72 emits a laser that passes through the zigzag unit 75 and is irradiated onto the surface of the AC electrode foil 2 by the refracting lamp head 73. The AC electrode foil 2 is arranged in a triangular shape in the transmission path of the triangular stretching assembly 52, and the triangular stretching assembly 52 is pushed back and forth by the moving mechanism 4, so that the laser emitted by the refracting lamp head 73 irradiates the inclined surface of the AC electrode foil 2. As the triangular stretching assembly 52 moves, the angle at which the laser irradiates the inclined surface of the AC electrode foil 2 also changes. The laser receiver 74 is used to receive the light signal refracted by the refracting lamp head 73 onto the inclined surface of the AC electrode foil 2.

[0095] In this process, because the triangular stretching component 52 is pushed back and forth by the moving mechanism 4, the angle of laser irradiation changes with the surface of the AC electrode foil 2. This allows the laser to cover different areas of the AC electrode foil 2, especially those areas that are difficult to detect at a fixed angle. Laser detection has the characteristic of high resolution and can capture tiny surface defects such as cracks and holes. By irradiating from multiple angles, more detailed information can be obtained, which helps to accurately locate the position and size of defects.

[0096] Moreover, laser irradiation at different angles can reduce shadow interference caused by uneven surface and improve the accuracy of detection results. The electrode foil is transmitted through a triangular path formed by the primary roller 521, the stretching roller 524 and the secondary roller 525, so that the laser can irradiate the surface of the electrode foil from different angles. It is specially designed to be able to perform comprehensive detection at different angles and meet the needs of diverse product forms.

[0097] Finally, it should be noted that the above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A surface defect detection device for AC electrode foil production, comprising a detection box (1) and an AC electrode foil (2), wherein a high-resolution camera (3) is provided on one side of the upper end of the detection box (1), characterized in that: Two moving mechanisms (4) are symmetrically arranged at the upper end of the detection box (1). An eddy current detection (5) is arranged between the two moving mechanisms (4) to stretch the AC electrode foil (2) and use eddy current to detect the AC electrode foil (2). A curved surface supplementary light detection mechanism (6) is arranged above the eddy current detection (5) to detect the extended part of the AC electrode foil (2) by using a curved surface supplementary light source. A laser detection mechanism (7) is arranged inside the detection box (1) and below the eddy current detection (5) to detect the inclined surface of the AC electrode foil (2) by using a laser. The eddy current testing (5) includes a triangular tensile assembly (52) installed between two moving mechanisms (4) to perform tensile testing on the AC electrode foil (2). A differential eddy current probe group (51) for deep testing of the AC electrode foil (2) is provided on one side of the triangular tensile assembly (52). A dual-frequency eddy current probe group (53) for comprehensive testing of the AC electrode foil (2) is provided on one side of the triangular tensile assembly (52). An eddy current array probe group (54) for detecting defects on both sides of the AC electrode foil (2) is provided inside the triangular tensile assembly (52) in cooperation with the dual-frequency eddy current probe group (53). The triangular stretching assembly (52) includes a triangular shell (522), which is triangular in shape. A primary roller (521) and a secondary roller (525) are rotatably mounted on the bottom of the triangular shell (522). A top opening (523) is provided on the upper part of the outer surface of the triangular shell (522). A stretching wheel (524) is rotatably mounted on the inner wall of the triangular shell (522) at the position of the top opening (523). A support block (526) is provided on one side of the triangular shell (522), and an installation groove (527) is provided on one side of the triangular shell (522). The differential eddy current probe group (51) includes a mounting frame (511), which is installed inside the mounting groove (527). The mounting frame (511) is provided with a number of support frames (512) arranged in a rectangular array. The support frames (512) are respectively provided with two adjacent and tightly coupled coil excitation coils (513) and detection coils (514). The dual-frequency eddy current probe group (53) includes a fixed frame (531), which is installed inside the triangular shell (522) and located on one side of the initial roller (521). Several fans (533) are provided on one side of the fixed frame (531), and an air guide shell (532) is provided on the other side of the fixed frame (531) to guide the airflow into and out of the top opening (523). Several hole spacing frames (534) arranged in a rectangular array are provided at the bottom of the fixed frame (531), and an outer coil (535) and an inner coil (536) are provided inside the hole spacing frame (534). The outer coil (535) is sleeved on the outside of the inner coil (536). The eddy current array probe group (54) includes a square frame (541), which is installed on the inner wall of the triangular shell (522). The inner wall of the square frame (541) is provided with a number of coil frames (542) arranged in a rectangular array. The tension wheel (524) is provided with a surface detection coil (543), and the position of the surface detection coil (543) corresponds to the position of the outer coil (535).

2. The surface defect detection device for AC electrode foil production according to claim 1, characterized in that: The moving mechanism (4) includes a fixed frame (41), which is installed on the upper end of the detection box (1). A slide rod (42) is provided on one side, and a slider (43) is slidably installed inside the slide rod (42). An electrical connecting chain (44) is provided on the upper end of the slider (43), and a triangular shell (522) is installed on one side of the slider (43).

3. The surface defect detection device for AC electrode foil production according to claim 1, characterized in that: The laser detection mechanism (7) includes a support frame (71), which is installed on the upper part of the inner wall of the detection box (1). A refraction lamp head (73) is provided at the upper end of the support frame (71), a laser receiver (74) is provided on one side of the refraction lamp head (73), a zigzag device (75) is provided at the bottom of the refraction lamp head (73), and a laser generator (72) is provided on one side of the zigzag device (75).

4. The surface defect detection device for AC electrode foil production according to claim 1, characterized in that: The curved surface supplementary lighting detection mechanism (6) includes a curved frame (61), which is installed on the upper end of the air guide shell (532) and the support block (526). An elliptical curved surface cover (62) is provided on the inner wall of the curved frame (61), and a detection head (63) is provided on the upper part of the inner wall of the elliptical curved surface cover (62).

5. The surface defect detection device for AC electrode foil production according to claim 4, characterized in that: The elliptical curved mask (62) is located above the stretching wheel (524), and the inner wall of the elliptical curved mask (62) is provided with a number of lamp beads (64).

6. A method for detecting surface defects in the production of AC electrode foil, comprising the surface defect detection device for the production of AC electrode foil as described in any one of claims 1-5, characterized in that, The specific testing methods are as follows: Step 1: The AC electrode foil (2) is conveyed and wound inside the triangular stretching assembly (52). The triangular stretching assembly (52) stretches the AC electrode foil (2) through the wound roller. The moving mechanism (4) can reciprocate to drive the triangular stretching assembly (52) to move, so that the AC electrode foil (2) conveyed inside the triangular stretching assembly (52) is stretched while the triangular stretching assembly (52) moves back and forth. Step 2: The AC electrode foil (2) wound inside the triangular tension assembly (52) is first subjected to eddy current detection by the dual-frequency eddy current probe group (53). The dual-frequency eddy current probe group (53) is equipped with coils of two frequencies, which are used to detect the surface and depth of the AC electrode foil (2) respectively. Moreover, the heat generated by the coil inside the dual-frequency eddy current probe group (53) will be dissipated through the air duct and blown onto the surface of the AC electrode foil (2). Step 3: The heat dissipated by the dual-frequency eddy current probe group (53) is blown onto the surface of the AC electrode foil (2) to preheat the AC electrode foil (2). The preheated AC electrode foil (2) will be transferred to the lower part of the curved surface supplementary lighting detection mechanism (6). The curved surface supplementary lighting detection mechanism (6) is set on the upper part of the triangular tension component (52). Because the triangular tension component (52) is triangular, the curved surface supplementary lighting detection mechanism (6) provides comprehensive supplementary lighting to the AC electrode foil (2) wrapped around the roller surface, and then detects the AC electrode foil (2) at the curved surface angle for visual defect detection. Step 4: When the AC electrode foil (2) is subjected to eddy current detection by the dual-frequency eddy current probe group (53), the set eddy current array probe group (54) performs eddy current detection on the lower surface of the AC electrode foil (2). Moreover, the eddy current array probe group (54) and the dual-frequency eddy current probe group (53) can perform surface detection on the upper and lower surfaces of the AC electrode foil (2) at the same time. Step 5: After being inspected by the curved surface supplementary lighting detection mechanism (6), the AC electrode foil (2) will be transported to the interior of the differential eddy current probe group (51). The differential eddy current probe group (51) can perform comprehensive deep inspection of the AC electrode foil (2). The laser detection mechanism (7) is located directly below the triangular stretching component (52). The triangular stretching component (52) guides the transport trajectory of the AC electrode foil (2) to be a triangular route. When the laser detection mechanism (7) uses laser to inspect the surface of the AC electrode foil (2), the laser shines on the tilted surface of the AC electrode foil (2). As the triangular stretching component (52) moves, the angle at which the laser detection mechanism (7) inspects the surface of the AC electrode foil (2) will also change. Finally, the AC electrode foil (2) transported out from the triangular stretching component (52) will be inspected again by the high-resolution camera (3).

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