Surface defect detection device and detection method for AC electrode foil production

Abstract

The invention discloses a surface defect detection device and detection method for AC electrode foil production, and relates to the technical field of electrode foil detection, the surface defect detection device comprises a detection box and an AC electrode foil, one side of the upper end of the detection box is provided with a high-resolution camera, and the upper end of the detection box is symmetrically provided with two moving mechanisms. According to the invention, the AC electrode foil is stretched by winding the rolling shaft, so that wrinkles and relaxation phenomena on the surface of a material can be effectively removed, the electrode foil is ensured to be in a flat state, internal stress of the electrode foil can be more uniform by stretching, false signals or actual defects caused by local stress concentration are avoided, and the reliability of the electrode foil is improved. The design of the triangular stretching assembly enables the AC electrode foil to be stretched in different directions, so that multi-angle and multi-azimuth detection is realized, and the electrode foil can be comprehensively detected from multiple dimensions by combining the differential eddy current probe group, the double-frequency eddy current probe group and the eddy current arrangement probe group.

Description

Technical Field

[0001] The present invention relates to the technical field of electrode foil detection, and in particular to a surface defect detection device and a detection method for AC electrode foil production. Background Art

[0002] For example, the publication number is CN119354987A, and its name is a surface defect detection device and detection method for electrode foil production. The electrode foil provided in the invention contacts the outer surface of the heated mounting shell during transportation, and is preheated by heat transfer. The preheating treatment causes the electrode foil material to undergo slight changes due to thermal expansion, and its internal defects become more obvious. The obviousness of the defects helps the subsequent detection steps to more accurately identify and locate these defects, thereby improving the accuracy and reliability of the detection. The electrode foil after preheating treatment is more easily captured by the detection mechanism, reducing the omission or false detection caused by the unclear defects.

[0003] During the transportation and inspection process of AC electrode foil, the uneven internal stress distribution will lead to local stress concentration, which will cause false signals or actual defects and affect the reliability of the detection results. In addition, structural changes inside or deep in the electrode foil, such as cracks and holes, are difficult to detect through simple visual inspection. In particular, there are significant differences in detection performance between the flat extended AC electrode foil and the electrode foil at a curved angle. The flat detection method is single and it is difficult to fully cover all potential defects. Therefore, the present application provides an optimized surface defect detection device and detection method for AC electrode foil production to meet these complex detection requirements and improve the accuracy and reliability of the detection results. Summary of the Invention

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

[0005] To achieve the above objectives, the present application provides the following technical solutions: 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 movable mechanisms are symmetrically provided on the upper end of the detection box, an eddy current detector is provided between the two movable mechanisms for stretching the AC electrode foil and inspecting the AC electrode foil using eddy currents, a curved surface supplementary light detection mechanism is provided above the eddy current detector to inspect the extended portion of the AC electrode foil using a curved surface supplementary light source, and a laser detection mechanism is provided inside the detection box and below the eddy current detector to inspect the inclined surface of the AC electrode foil using a laser; The eddy current detection includes a triangular stretching assembly installed between two moving mechanisms for performing stretching detection on the AC electrode foil. A differential eddy current probe group for performing deep detection of the AC electrode foil is provided on one side of the triangular stretching assembly. A dual-frequency eddy current probe group for performing comprehensive detection of the AC electrode foil is provided on one side of the triangular stretching assembly. An eddy current arrangement probe group is provided inside the triangular stretching assembly to cooperate with the dual-frequency eddy current probe group to detect defects on both sides of the AC electrode foil.

[0006] Among them, the triangular stretching assembly includes a triangular shell, which is triangular in shape. The bottom of the triangular shell is rotatably installed with a primary roller and an auxiliary roller. A top opening is provided on the upper part of the outer surface of the triangular shell. A stretching wheel is rotatably installed 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.

[0007] Among them, the moving mechanism includes a fixed frame, which is installed at the upper end of the detection box. A sliding rod is provided on one side, and a slider is slidably installed inside the sliding rod. An electrical connection chain is provided at the upper end of the slider, and the triangular shell is installed on one side of the slider.

[0008] Among them, the differential eddy current probe group includes an installation frame, which is installed inside the installation slot. Several support frames distributed in a rectangular array are arranged inside the installation frame, and two adjacent and tightly coupled coil excitation coils and detection coils are respectively arranged inside the support frames.

[0009] Among them, the dual-frequency eddy current detection group includes a fixed frame, which is installed inside the triangular shell and located on one side of the primary 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 air flow in 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, and the outer coil is arranged on the outside of the inner coil.

[0010] Among them, the eddy current arrangement detection group includes a square frame, which is installed on the inner wall of the triangular shell, and the inner wall of the square frame is provided with a number of coil frames distributed in a rectangular array, and a surface detection coil is provided inside the stretching wheel, and the position of the surface detection coil corresponds to the position of the outer coil.

[0011] Among them, the laser detection mechanism includes a support frame, which is installed on the upper part of the inner wall of the detection box. A refractive lamp head is provided at the upper end of the support frame, a laser receiver is provided on one side of the refractive lamp head, a folding device is provided at the bottom of the refractive lamp head, and a laser generator is provided on one side of the folding device.

[0012] The curved surface fill light detection mechanism includes a curved frame, which is installed on the upper ends of the air guide shell and the support block. The inner wall of the curved frame is provided with an elliptical curved surface cover, and the upper part of the inner wall of the elliptical curved surface cover is provided with a detection head.

[0013] The elliptical curved cover is located above the stretching wheel, and a plurality of lamp beads are provided on the inner wall of the elliptical curved cover.

[0014] The present invention also provides a surface defect detection method for AC electrode foil production. The specific detection method is as follows: Step 1: The AC electrode foil is transported and wound inside the triangular stretching assembly, and the triangular stretching assembly stretches the AC electrode foil via the wound rollers. The moving mechanism can reciprocate and drive the triangular stretching assembly to stretch the AC electrode foil transported inside the triangular stretching assembly while the triangular stretching assembly reciprocates. Step 2: The AC electrode foil wound inside the triangular stretching assembly first undergoes eddy current testing by a dual-frequency eddy current probe. The dual-frequency eddy current probe is equipped with two frequency coils, which respectively perform surface and deep layer testing on the AC electrode foil. The heat generated by the coils inside the dual-frequency eddy current probe is blown onto the surface of the AC electrode foil through the air duct. Step 3: The heat dissipated by the dual-frequency eddy current probe group is blown onto the surface of the AC electrode foil to preheat the AC electrode foil. The preheated AC electrode foil is then transferred to the bottom of the curved surface fill light detection mechanism. The curved surface fill light detection mechanism is located above the triangular stretching assembly. Since the triangular stretching assembly is triangular in shape, the curved surface fill light detection mechanism performs comprehensive fill light on the AC electrode foil wound on the roller surface, thereby detecting the AC electrode foil at a curved angle for visual defects. Step 4: When the AC electrode foil is subjected to eddy current testing by the dual-frequency eddy current probe group, the eddy current array probe group performs eddy current testing on the lower surface of the AC electrode foil. Moreover, the eddy current array probe group and the dual-frequency eddy current probe group can simultaneously perform surface testing on the upper and lower surfaces of the AC electrode foil. Step 5. After being inspected by the curved surface fill light detection mechanism, the AC electrode foil will be transported to the inside of the differential eddy current probe group. The set differential eddy current probe group can perform comprehensive and deep inspection of the AC electrode foil, and the set laser detection mechanism is located directly below the triangular stretching component. The set triangular stretching component guides the conveying trajectory of the AC electrode foil to be a triangular route, so that when the laser detection mechanism uses laser to detect the surface of the AC electrode foil, the laser is illuminated on the inclined surface of the AC electrode foil, and as the triangular stretching component moves, the angle at which the laser detection mechanism detects the surface of the AC electrode foil will also change. Finally, the AC electrode foil transported from the triangular stretching component will be inspected again by a high-resolution camera.

[0015] In summary, the technical effects and advantages of the present invention are as follows: 1. The present invention stretches the AC electrode foil by winding it around rollers, 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 assembly enables 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, dual-frequency eddy current probe group and eddy current array probe group, the electrode foil can be comprehensively inspected from multiple dimensions.

[0016] 2. The combination of the dual-frequency eddy current probe group in the present invention can simultaneously obtain surface and deep-layer information during 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 to the surface of the AC electrode foil. Appropriate heating can help remove moisture or volatile pollutants on 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. In addition, heating can help release the stress accumulated inside the AC electrode foil, reducing false signals or actual defects caused by stress concentration.

[0017] 3. In the present 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 pollutants on the surface of the electrode foil, making the surface cleaner and reducing misjudgment caused by water vapor condensation or pollutants. Since the triangular stretching component is triangular in shape, the curved surface fill light detection mechanism can fully fill light on the AC electrode foil wound on the surface of its roller, ensuring that the surface of the electrode foil can obtain uniform lighting conditions even at a curved angle, thereby improving the effect of visual inspection.

[0018] 4. The present invention uses a dual-frequency eddy current probe group to detect the upper surface and an eddy current array probe group to detect 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 acquired from different depth levels. The high-frequency coil focuses on surface defect detection, while the low-frequency coil is used to detect deep or subsurface defects. The dual-frequency eddy current probe group combines the advantages of high-frequency and low-frequency eddy current testing, capable of detecting 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 detection. For example, scratches and holes, which are typically located on the surface layer of the electrode foil, can be efficiently detected by the eddy current array probe group.

[0019] 5. The differential eddy current probe group in the present invention can perform comprehensive deep-layer inspection of the electrode foil. Because its differential configuration is very sensitive to local changes, it is suitable for detecting tiny defects or changes within the material. Unlike the dual-frequency eddy current probe group and the eddy current arrangement probe group, the differential eddy current probe group focuses on more subtle and local deep-layer defect detection, ensuring a detailed inspection of the internal structure of the AC electrode foil. In addition, because the triangular stretching assembly guides the AC electrode foil to be transported along the triangular route, the laser of the laser detection mechanism irradiates the inclined surface of the AC electrode foil and changes its angle as the assembly moves. This allows the electrode foil surface to be inspected from multiple angles, improving the comprehensiveness and accuracy of the inspection. For AC electrode foil with complex geometries, the inspection of the inclined surface helps capture more details. Finally, the high-resolution camera can provide a high-resolution image of the electrode foil surface, helping to capture tiny surface defects and features. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present application. For those skilled in the art, other drawings can be obtained based on these drawings without paying any creative work.

[0021] Figure 1 This is a schematic diagram of the three-dimensional structure of a surface defect detection device for AC electrode foil production; Figure 2 This is a schematic diagram of the internal structure of a surface defect detection device for AC electrode foil production from a first perspective; Figure 3 This is a schematic diagram of the internal three-dimensional structure from a second perspective of a surface defect detection device for AC electrode foil production; Figure 4 A schematic diagram of the internal structure of a surface defect detection device for AC electrode foil production from a third perspective; Figure 5 A schematic diagram of a partial three-dimensional connection structure of the first-view internal three-dimensional structure schematic diagram; Figure 6 This is a schematic diagram of the first-person perspective three-dimensional connection structure of the laser detection mechanism; Figure 7 A schematic diagram of the second-view stereoscopic connection structure of the laser detection mechanism; Figure 8 This is a positional relationship diagram for the laser detection mechanism and the eddy current detection mechanism; Figure 9 It is a schematic diagram of the three-dimensional connection structure of the moving mechanism and eddy current detection; Figure 10 Schematic diagram of the three-dimensional connection structure of the mobile mechanism; Figure 11 It is a schematic diagram of the three-dimensional connection structure of the differential eddy current probe group, the triangular stretching assembly and the dual-frequency eddy current probe group; Figure 12 It is a schematic diagram of the three-dimensional connection structure of the differential eddy current probe group and the curved surface fill light detection mechanism; Figure 13 It is 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 stretching assembly; Figure 14 It is a cross-sectional view of the three-dimensional connection structure of the triangular stretching component; Figure 15 Schematic diagram of the three-dimensional connection structure of the triangular stretching component and the AC electrode foil; Figure 16 This is a schematic diagram of the three-dimensional connection structure of the dual-frequency eddy current probe group; Figure 17 This is a schematic diagram of the three-dimensional connection structure of the eddy current arrangement probe group; Figure 18 It is a schematic diagram of the three-dimensional connection structure of the differential eddy current probe group; Figure 19 It is a schematic diagram of the three-dimensional connection structure of the curved surface fill light detection mechanism; Figure 20 It is a cross-sectional view of the three-dimensional connection structure of the curved surface fill light detection mechanism.

[0022] In the figure: 1. Detection box; 2. AC electrode foil; 3. High-resolution camera; 4. Moving mechanism; 41. Fixing frame; 42. Sliding rod; 43. Sliding block; 44. Electrical connection chain; 5. Eddy current detection; 51. Differential eddy current probe group; 511. Mounting frame; 512. Support frame; 513. Excitation coil; 514. Detection coil; 52. Triangular stretching assembly; 521. Primary roller; 522. Triangular shell; 523. Top opening; 524. Stretching wheel; 525. Auxiliary roller; 526. Support block; 527. Mounting slot; 53. Dual-frequency eddy current detection group; 531, fixed frame; 532, air guide shell; 533, fan; 534, hole spacing frame; 535, outer coil; 536, inner coil; 54, eddy current arrangement detection group; 541, square frame; 542, coil frame; 543, surface detection coil; 6, curved surface fill light detection mechanism; 61, curved frame; 62, elliptical curved surface cover; 63, detection head; 64, lamp beads; 7, laser detection mechanism; 71, support frame; 72, laser generator; 73, refraction lamp head; 74, laser receiver; 75, folding device. DETAILED DESCRIPTION

[0023] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0024] Example 1, Reference Figures 1 to 20 The device for detecting surface defects in AC electrode foil production is shown, comprising an inspection box 1 and an AC electrode foil 2. A high-resolution camera 3 is provided on one side of the upper end of the inspection box 1. Two movable mechanisms 4 are symmetrically provided on the upper end of the inspection box 1. An eddy current detector 5 is provided between the two movable mechanisms 4 for stretching the AC electrode foil 2 and inspecting the AC electrode foil 2 using eddy currents. A curved surface supplementary light detection mechanism 6 is provided above the eddy current detector 5 to inspect the extended portion of the AC electrode foil 2 with a curved surface supplementary light source. A laser detection mechanism 7 is provided inside the inspection box 1 and below the eddy current detector 5 to inspect the inclined surface of the AC electrode foil 2 using a laser. The eddy current detection 5 includes a triangular stretching assembly 52 installed between two moving mechanisms 4 for performing stretching detection on the AC electrode foil 2. A differential eddy current probe group 51 for performing deep detection on the AC electrode foil 2 is provided on one side of the triangular stretching assembly 52. ​​A dual-frequency eddy current probe group 53 for performing comprehensive detection on the AC electrode foil 2 is provided on one side of the triangular stretching assembly 52. ​​An eddy current arrangement probe group 54 is provided inside the triangular stretching assembly 52 to cooperate with the dual-frequency eddy current probe group 53 to detect defects on the front and back sides of the AC electrode foil 2.

[0025] It is worth noting that the AC electrode foil 2 is transported and wound inside the triangular stretching assembly 52, and the triangular stretching assembly 52 stretches the AC electrode foil 2 through the wound rollers, and the moving mechanism 4 is capable of reciprocatingly driving the triangular stretching assembly 52 to move, so that the triangular stretching assembly 52 reciprocates while stretching the AC electrode foil 2 transported inside the triangular stretching assembly 52; Among them, by stretching the AC electrode foil with winding rollers, wrinkles and looseness on the surface of the material can be effectively removed, 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 52 enables 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.

[0026] The AC electrode foil 2 wound inside the triangular stretching assembly 52 first undergoes eddy current testing by the dual-frequency eddy current probe assembly 53. The dual-frequency eddy current probe assembly 53 is internally provided with two frequency coils, which respectively perform surface and deep layer testing on the AC electrode foil 2. The heat generated by the coils inside the dual-frequency eddy current probe assembly 53 is dissipated through the air duct and blown onto the surface of the AC electrode foil 2. 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 surface of the material, 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 obtain surface and deep information at the same time during a single detection process. The dual-frequency eddy current probe group 53 will generate a certain amount of heat when working. The heat is dissipated through the air duct and blown directly to the surface of the AC electrode foil 2. Appropriate heating can help remove moisture or volatile pollutants on 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. In addition, heating can help release the stress accumulated inside the AC electrode foil 2, reducing false signals or actual defects caused by stress concentration.

[0027] 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 bottom of the curved surface fill light detection mechanism 6. The curved surface fill light detection mechanism 6 is located above the triangular stretching assembly 52. ​​Since the triangular stretching assembly 52 is triangular in shape, the curved surface fill light detection mechanism 6 performs comprehensive fill light on the AC electrode foil 2 wound on the roller surface, thereby detecting the AC electrode foil 2 at a curved angle for visual defects. Among them, the electrode foil is preheated by the heat generated by the dual-frequency eddy current probe group 53, which can effectively remove moisture or other volatile pollutants on the surface of the electrode foil, making the surface cleaner and reducing misjudgment caused by water vapor condensation or pollutants. Since the triangular stretching component 52 is triangular in shape, the curved surface fill light detection mechanism 6 can fully fill light on the AC electrode foil 2 wound on its roller surface, ensuring that the electrode foil surface can obtain uniform lighting conditions even at a curved angle, thereby improving the effect of visual detection.

[0028] When the AC electrode foil 2 is subjected to eddy current testing by the dual-frequency eddy current probe group 53, the eddy current array probe group 54 performs eddy current testing on the lower surface of the AC electrode foil 2. Moreover, the eddy current array probe group 54 cooperates with the dual-frequency eddy current probe group 53 to simultaneously perform surface testing on the upper and lower surfaces of the AC electrode foil 2. Among them, the upper surface is detected by the dual-frequency eddy current probe group 53, while the lower surface is detected by the eddy current arrangement probe group 54, so that the upper and lower surfaces of the AC electrode foil 2 can be detected simultaneously. 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 deep layers or the lower surface.

[0029] The dual-frequency eddy current probe group 53 combines the advantages of high-frequency and low-frequency eddy current detection, and can detect both surface defects and changes in deep structures. The eddy current arrangement probe group 54 is specifically used to detect defects on the lower surface of the electrode foil, further improving the comprehensiveness and depth of detection. For example, scratches, holes, etc., which are usually located on the surface layer of the electrode foil, can be efficiently detected by the eddy current arrangement probe group 54.

[0030] After being inspected by the curved surface fill light 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 and in-depth inspection of the AC electrode foil 2, and the laser detection mechanism 7 is located directly below the triangular stretching component 52. The triangular stretching component 52 guides the conveying trajectory of the AC electrode foil 2 to be a triangular route, so that when the laser detection mechanism 7 uses laser to detect the surface of the AC electrode foil 2, the laser is illuminated on the inclined surface of the AC electrode foil 2, and as the triangular stretching component 52 moves, the angle at which the laser detection mechanism 7 detects the surface of the AC electrode foil 2 will also change. Finally, the AC electrode foil 2 transported out of the triangular stretching component 52 will be inspected again by the high-resolution camera 3.

[0031] Among them, the differential eddy current probe group 51 is capable of performing comprehensive deep detection of the electrode foil. Since its differential configuration is very sensitive to local changes, it is suitable for detecting tiny defects or changes inside the material. Unlike the dual-frequency eddy current probe group 53 and the eddy current arrangement probe group 54, the differential eddy current probe group 51 focuses on more subtle and local deep defect detection, ensuring a detailed inspection of the internal structure of the AC electrode foil 2.

[0032] And because the triangular stretching component 52 guides the AC electrode foil 2 to be transported along the triangular route, the laser of the laser detection mechanism 7 is irradiated on the inclined surface of the AC electrode foil 2 and changes its angle as the component moves, so that the electrode foil surface can be detected from multiple angles, thereby improving the comprehensiveness and accuracy of the detection. For AC electrode foil 2 with complex geometric shapes, the detection of the inclined surface helps to capture more details. Finally, the high-resolution camera 3 can provide a high-resolution image of the electrode foil surface, helping to capture tiny surface defects and features.

[0033] Embodiment 2: Based on the triangular stretching assembly 52 and the moving mechanism 4 proposed in embodiment 1, this embodiment provides a further technical solution for the triangular stretching assembly 52 and the moving mechanism 4.

[0034] The triangular stretching assembly 52 includes a triangular shell 522, which is triangular in shape. A primary roller 521 and an auxiliary roller 525 are rotatably installed on the bottom of the triangular shell 522. A top opening 523 is provided on the upper portion of the outer surface of the triangular shell 522. A stretching wheel 524 is rotatably installed 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 a mounting groove 527 is provided on one side of the triangular shell 522.

[0035] It is worth noting that the AC electrode foil 2 is guided by the primary roller 521 and wound on the surface of the stretching wheel 524, and then the AC electrode foil 2 is wound on the surface of the secondary roller 525 and then transmitted. The AC electrode foil 2 is guided by the primary roller 521, the stretching wheel 524 and the secondary roller 525 and is transmitted in a triangular path.

[0036] The moving mechanism 4 includes a fixed frame 41, which is installed at the upper end of the detection box 1. A slide rod 42 is provided on one side. A slider 43 is slidably installed inside the slide rod 42. An electrical connection chain 44 is provided at the upper end of the slider 43. The triangular shell 522 is installed on one side of the slider 43.

[0037] Among them, the slider 43 can drive the triangular shell 522 to move back and forth along the path guided by the slide rod 42, and the set electrical connection chain 44 provides power transmission for the slider 43 and the equipment inside the eddy current detection 5. The set slider 43 moves slowly and adjusts the moving speed of the slider 43 inside the slide rod 42 according to the tensile strength of the AC electrode foil 2.

[0038] Among them, through the guidance of the primary roller 521, the stretching wheel 524 and the auxiliary roller 525, the AC electrode foil 2 can be evenly stretched when conveyed on the triangular path, removing wrinkles and looseness on the surface of the material, ensuring that it is in a flat state, and the slider 43 adjusts its moving speed on the slide bar 42 according to the tensile strength of the AC electrode foil 2, ensuring that the material maintains appropriate tension during the entire detection process and avoids excessive stretching or relaxation. Through the design of the primary roller 521, the stretching wheel 524 and the auxiliary roller 525, the AC electrode foil 2 forms a stable triangular transmission path, which not only helps to maintain the flatness of the material, but also ensures its stability during transmission, reducing detection errors caused by material deformation.

[0039] Since the slider 43 adjusts the moving speed according to the tensile strength of the AC electrode foil 2 , it is ensured that the lifting distance between the AC electrode foil 2 and the eddy current probe group remains constant.

[0040] Embodiment 3: Based on the dual-frequency eddy current probe group 53 and the eddy current arrangement probe group 54 proposed in Embodiment 1, this embodiment provides a further technical solution for the dual-frequency eddy current probe group 53 and the eddy current arrangement probe group 54.

[0041] The dual-frequency eddy current detection group 53 includes a fixed frame 531, which is installed inside the triangular shell 522 and is located on one side of the primary 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 air flow in and out of the top opening 523. Several hole spacing frames 534 distributed 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, and the outer coil 535 is arranged on the outside of the inner coil 536.

[0042] 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 and detect defects within the material or deep layers. The low-frequency eddy current of the inner coil 536 has a greater penetration depth and can detect areas several millimeters below the surface of the AC electrode foil 2. In contrast, the outer coil 535 uses a high-frequency current that flows mainly 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. It is mainly used to detect subtle defects such as small surface cracks and scratches on the AC electrode foil 2. The fan 533 is provided to continuously blow air into the interior of the fixed frame 531 to dissipate heat for the inner coil 536 and the outer coil 535. The air blown through the fixed frame 531 will enter the interior of the air guide shell 532, and then the air will be guided by the air guide shell 532 and blown onto the surface of the AC electrode foil 2, mainly to clean the surface of the AC electrode foil 2. The heat generated by the inner coil 536 and the outer coil 535 will also preheat the surface of the AC electrode foil 2, thereby facilitating the subsequent detection by the curved surface fill light detection mechanism 6.

[0043] Among them, the low-frequency current of the inner coil 536 can penetrate deeper material layers and detect defects inside or deep in 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.

[0044] The high-frequency current in the high-frequency outer coil 535 flows primarily near the surface of the electrode foil, providing higher spatial resolution and primarily used for detecting subtle defects such as tiny surface cracks and scratches. High-frequency eddy currents have a shallow penetration depth but can capture surface details.

[0045] By combining low-frequency and high-frequency eddy current testing technologies, surface and deep-layer information can be obtained simultaneously during a single inspection process, 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.

[0046] The fan 533 continuously blows air into the fixed frame 531 to dissipate heat for the inner coil 536 and the outer coil 535 to prevent overheating from affecting the detection performance. The heat is directed to the surface of the AC electrode foil 2 to preheat it. The air guided by the fan 533 enters the air guide shell 532 and is then blown onto the surface of the electrode foil, ensuring a uniform heating effect, removing surface moisture and volatile pollutants, and reducing misjudgments caused by water vapor condensation.

[0047] The eddy current arrangement detection group 54 includes a square frame 541, which is installed on the inner wall of the triangular shell 522, and the inner wall of the square frame 541 is provided with a plurality of coil frames 542 distributed in a rectangular array. A surface detection coil 543 is provided inside the stretching wheel 524, and the position of the surface detection coil 543 corresponds to the position of the outer coil 535.

[0048] Among them, when the upper surface of the AC electrode foil 2 is detected by the above-mentioned outer coil 535, the surface detection coil 543 is a high-frequency anti-eddy current coil, which is used to detect the lower surface of the AC electrode foil 2. Moreover, the surface detection coil 543 is a high-frequency anti-eddy current coil, which does not affect the normal operation of the inner coil 536 and the outer coil 535.

[0049] Among them, the upper surface is detected by the outer coil 535, while the lower surface is detected by the surface detection coil 543, thereby realizing simultaneous detection of the upper and lower surfaces of the electrode foil. 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 the detection of tiny defects on the upper surface, while the surface detection coil 543 is used for the detection of the lower surface, ensuring all-round information coverage.

[0050] The inner coil 536 uses low-frequency current for deep detection, which can detect defects inside or deep in the electrode foil. The high-frequency outer coil 535 and the surface detection coil 543 detect tiny defects on the upper and lower surfaces respectively. This combination can obtain surface and deep information simultaneously during a single detection process, thereby improving the accuracy of detection.

[0051] Embodiment 4: Based on the differential eddy current probe group 51 proposed in Embodiment 1, this embodiment provides a further technical solution for the differential eddy current probe group 51.

[0052] The differential eddy current probe group 51 includes a mounting frame 511, which is installed inside the mounting groove 527. A plurality of support frames 512 distributed in a rectangular array are arranged inside the mounting frame 511, and two adjacent and tightly coupled coil excitation coils 513 and detection coils 514 are respectively arranged inside the support frames 512.

[0053] It is worth noting that when the AC electrode foil 2 moves to the bottom of the mounting frame 511, the excitation coil 513 cooperates with the detection coil 514 to detect local changes in the AC electrode foil 2 and surface defects such as cracks and holes based on the signal difference between the two coils.

[0054] Among them, the differential configuration composed of the excitation coil 513 and the detection coil 514 is very sensitive to local changes and can accurately capture tiny changes on the surface of the electrode foil, such as cracks or holes. In addition, the alternating magnetic field generated by the excitation coil 513 interacts with the detection coil 514 to form a uniform magnetic field environment, reducing detection errors caused by uneven magnetic fields.

[0055] Embodiment 5: Based on the curved surface fill light detection mechanism 6 proposed in Embodiment 1, this embodiment provides an improved technical solution for the curved surface fill light detection mechanism 6.

[0056] The curved fill light detection mechanism 6 includes a curved frame 61 , which is installed on the upper ends of the air guide housing 532 and the support block 526 . An elliptical curved 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 cover 62 .

[0057] The elliptical curved cover 62 is located above the stretching wheel 524 , and a plurality of light beads 64 are provided on the inner wall of the elliptical curved cover 62 .

[0058] 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 on the surface of the stretching wheel 524, and the lamp beads 64 arranged on the inner wall of the elliptical curved cover 62 provide fill light to the AC electrode foil 2 on the curved surface. Because the AC electrode foil 2 is stretched by the stretching wheel 524, the AC electrode foil 2 wound on the surface of the stretching wheel 524 is easier to detect its surface defects, and the AC electrode foil 2 is processed by the air guide shell 532 in advance and then wound on the surface of the stretching wheel 524, so that the defects on the surface of the AC electrode foil 2 are easier to show, and the detection head 63 performs visual inspection on the curved AC electrode foil 2, and the elliptical curved cover 62 is set. Figure 19 and Figure 20 The shape shown can fully illuminate the curved AC electrode foil 2 with supplementary light.

[0059] Among them, when the AC electrode foil 2 is wound on the stretching wheel 524, it is subjected to stretching, making the material smoother, and the lamp beads 64 on the inner wall of the elliptical curved cover 62 can provide comprehensive fill-in lighting for the electrode foil on the curved surface, providing uniform lighting conditions, so that the image quality is higher. The design of the elliptical curved cover 62 can provide comprehensive fill-in lighting for the electrode foil on the curved surface, ensuring that the surface at all angles can be fully covered by light, reducing the detection blind area, and the electrode foil is transmitted through the triangular path formed by the primary roller 521, the stretching wheel 524 and the auxiliary roller 525, so that the detection head 63 can perform comprehensive detection at different angles and adapt to electrode foils with complex geometric shapes.

[0060] 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.

[0061] 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 line folding 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 line folding device 75.

[0062] It is worth noting that the laser emitted by the laser generator 72 passes through the folding device 75 and is irradiated on the surface of the AC electrode foil 2 through the refractive lamp head 73. The transmission path of the AC electrode foil 2 set in the triangular stretching component 52 is in the shape of a triangle, and the triangular stretching component 52 is pushed back and forth by the moving mechanism 4, so that the laser emitted by the refractive lamp head 73 is irradiated on the inclined surface of the AC electrode foil 2, and as the triangular stretching component 52 moves, the angle of the laser irradiated on the inclined surface of the AC electrode foil 2 also changes accordingly, and the set laser receiver 74 is used to receive the light signal refracted by the refractive lamp head 73 on the inclined surface of the AC electrode foil 2.

[0063] Because triangular stretching assembly 52 is driven back and forth by moving mechanism 4, the angle of laser irradiation changes with the surface of AC electrode foil 2, allowing the laser to cover different areas of AC electrode foil 2, especially those that are difficult to detect at a fixed angle. Laser detection has the characteristic of high resolution, which can capture tiny surface defects such as cracks and holes. By irradiating from multiple angles, more detailed information can be obtained, helping to accurately locate the location and size of defects.

[0064] Moreover, laser irradiation at different angles can reduce shadow interference caused by surface unevenness and improve the accuracy of detection results. The electrode foil is transmitted through the triangular path formed by the primary roller 521, the stretching wheel 524 and the auxiliary roller 525, so that the laser can be irradiated to the surface of the electrode foil from different angles. The special design is suitable for comprehensive detection at different angles to meet the diverse product form requirements.

[0065] Finally, it should be noted that the above are only 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 aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or make equivalent replacements for some of the technical features therein. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection 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 detector (5) is arranged between the two moving mechanisms (4) for stretching the AC electrode foil (2) and detecting the AC electrode foil (2) using eddy current; a curved surface supplementary light detection mechanism (6) is arranged on the upper part of the eddy current detector (5) for detecting the extended portion of the AC electrode foil (2) using a curved surface supplementary light source; a laser detection mechanism (7) is arranged inside the detection box (1) and below the eddy current detector (5) for detecting the inclined surface of the AC electrode foil (2) using a laser; The eddy current detection (5) comprises a triangular stretching assembly (52) installed between two moving mechanisms (4) for performing stretching detection on the AC electrode foil (2); a differential eddy current probe group (51) for performing deep detection on the AC electrode foil (2) is provided on one side of the interior of the triangular stretching assembly (52); a dual-frequency eddy current probe group (53) for performing comprehensive detection on the AC electrode foil (2) is provided on one side of the triangular stretching assembly (52); and an eddy current arrangement probe group (54) for cooperating with the dual-frequency eddy current probe group (53) to detect defects on both the front and back surfaces of the AC electrode foil (2) is provided inside the triangular stretching assembly (52).

2. The surface defect detection device for AC electrode foil production according to claim 1, characterized in that: The triangular stretching assembly (52) comprises a triangular shell (522) having a triangular shape. A primary roller (521) and an auxiliary roller (525) are rotatably mounted on the bottom of the triangular shell (522). A top opening (523) is provided on the upper portion 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). A mounting groove (527) is provided on one side of the triangular shell (522).

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

4. The surface defect detection device for AC electrode foil production according to claim 2, characterized in that: The differential eddy current probe group (51) comprises a mounting frame (511), the mounting frame (511) being mounted inside a mounting slot (527), a plurality of supporting frames (512) distributed in a rectangular array being arranged inside the mounting frame (511), and two adjacent and tightly coupled coil excitation coils (513) and detection coils (514) being respectively arranged inside the supporting frames (512).

5. The surface defect detection device for AC electrode foil production according to claim 2, characterized in that: The dual-frequency eddy current detection group (53) includes a fixed frame (531), the fixed frame (531) is installed inside the triangular shell (522) and is located on one side of the primary roller (521), a plurality of fans (533) are provided on one side of the fixed frame (531), and a wind guide shell (532) is provided on the other side of the fixed frame (531) for guiding airflow into and out of the top opening (523), a plurality of aperture racks (534) distributed 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 aperture rack (534), and the outer coil (535) is sleeved on the outside of the inner coil (536).

6. The surface defect detection device for AC electrode foil production according to claim 5, characterized in that: The eddy current arrangement detection group (54) includes a square frame (541), the square frame (541) is installed on the inner wall of the triangular shell (522), and the inner wall of the square frame (541) is provided with a plurality of coil frames (542) distributed in a rectangular array. A surface detection coil (543) is provided inside the stretching wheel (524), and the position of the surface detection coil (543) corresponds to the position of the outer coil (535).

7. 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), the support frame (71) 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 line folding 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 line folding device (75).

8. The surface defect detection device for AC electrode foil production according to claim 5, characterized in that: The curved surface fill light detection mechanism (6) comprises a curved frame (61), the curved frame (61) being mounted on the upper ends of the air guide housing (532) and the support block (526), ​​an elliptical curved surface cover (62) being provided on the inner wall of the curved frame (61), and a detection head (63) being provided on the upper portion of the inner wall of the elliptical curved surface cover (62).

9. The surface defect detection device for AC electrode foil production according to claim 8, characterized in that: The elliptical curved cover (62) is located above the stretching wheel (524), and a plurality of lamp beads (64) are provided on the inner wall of the elliptical curved cover (62).

10. A method for detecting surface defects in AC electrode foil production, using the device for detecting surface defects in AC electrode foil production according to any one of claims 1 to 9, characterized in that: The specific detection methods are as follows: Step 1: The AC electrode foil (2) is transported and wound inside the triangular stretching assembly (52), and the triangular stretching assembly (52) stretches the AC electrode foil (2) through the wound roller, and the moving mechanism (4) is capable of reciprocatingly driving the triangular stretching assembly (52) to move, so that the triangular stretching assembly (52) reciprocates while stretching the AC electrode foil (2) transported inside the triangular stretching assembly (52); Step 2: The AC electrode foil (2) wound inside the triangular stretching assembly (52) is first subjected to eddy current detection by a dual-frequency eddy current probe assembly (53). The dual-frequency eddy current probe assembly (53) is provided with two-frequency coils for respectively performing surface and deep layer detection on the AC electrode foil (2). Moreover, the heat generated by the coils inside the dual-frequency eddy current probe assembly (53) is blown onto the surface of the AC electrode foil (2) through the air duct for heat dissipation. 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) is transferred to the bottom of the curved surface fill-in light detection mechanism (6). The curved surface fill-in light detection mechanism (6) is arranged on the upper part of the triangular stretching component (52). Since the triangular stretching component (52) is arranged in a triangular shape, the curved surface fill-in light detection mechanism (6) performs comprehensive fill-in light on the AC electrode foil (2) wound on 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 eddy current arrangement probe group (54) is provided to perform eddy current detection on the lower surface of the AC electrode foil (2), and the eddy current arrangement probe group (54) cooperates with the dual-frequency eddy current probe group (53) to simultaneously perform surface detection on the upper and lower surfaces of the AC electrode foil (2); Step 5: After being inspected by the curved surface fill light inspection mechanism (6), the AC electrode foil (2) is transported to the interior of the differential eddy current detection group (51). The set differential eddy current detection group (51) can perform a comprehensive deep inspection of the AC electrode foil (2), and the set laser inspection mechanism (7) is located directly below the triangular stretching assembly (52). The set triangular stretching assembly (52) guides the transport trajectory of the AC electrode foil (2) to be a triangular route, so that when the laser inspection mechanism (7) uses laser to inspect the surface of the AC electrode foil (2), the laser is illuminated on the inclined surface of the AC electrode foil (2), and as the triangular stretching assembly (52) moves, the angle at which the laser inspection mechanism (7) inspects the surface of the AC electrode foil (2) will also change. Finally, the AC electrode foil (2) transported out of the triangular stretching assembly (52) will be inspected again by the high-resolution camera (3).

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