Metal composite strip eddy current infrared combined flaw detection device

Abstract

The utility model provides a kind of metal composite tape eddy infrared combined flaw detection device, it is mainly composed of conveying mechanism, electric eddy current probe and infrared thermal imager, conveying mechanism is made of a pair of driving roller and a pair of passive roller, metal composite tape moves from passive roller side to driving roller side;Electric eddy current probe is arranged between driving roller and passive roller, and close to the side of passive roller, for detecting whether metal composite tape has defect;Infrared thermal imager is arranged between driving roller and passive roller, and close to the side of driving roller, the position, shape and size of defect are shown using the heating effect of electric eddy current probe to metal composite tape.Electric eddy current probe can detect the depth of defect, infrared thermal imager can show the position, shape and size of defect, the source and cause of defect can be determined by the cooperation of electric eddy current probe and infrared thermal imager, provide basis for nondestructive production of metal composite tape.

Description

Technical Field

[0001] This utility model is specifically a metal composite strip eddy current infrared combined flaw detection device, which relates to the field of metal strip flaw detection technology. Background Technology

[0002] Eddy current testing is a flaw detection method that uses the principle of eddy currents to detect surface and near-surface defects in conductive workpieces. The advantages of eddy current testing are that it is non-contact with the workpiece, can detect the depth of defects, has a fast testing speed, and is highly efficient. The disadvantage is that it cannot reveal the shape, size, and specific location of defects. For metal composite strips, typically copper-aluminum composite strips, it is also necessary to detect whether the composite surface contains foreign matter such as flying insects or impurities. Therefore, eddy current testing alone is insufficient; other methods must be used to reveal the shape, size, and specific location of defects. Utility Model Content

[0003] To overcome the shortcomings of the prior art, this utility model discloses a metal composite eddy current infrared combined flaw detection device, which adopts the following technical solution: A metal composite eddy current infrared combined flaw detection device includes: The conveying mechanism consists of a pair of driving rollers and a pair of driven rollers, and the metal composite belt moves from the side of the driven rollers to the side of the driving rollers; An eddy current probe is placed between the active roller and the passive roller, and closer to the passive roller, to detect defects in the metal composite strip. An infrared thermal imager is positioned between the active roller and the passive roller, and closer to the active roller. It uses the heating effect of an eddy current probe on the metal composite strip to display the location, shape, and size of defects.

[0004] Further improve the technical solution: use the metal composite strip as the dividing line, set the eddy current probe and the infrared thermal imager on the same side, and use the infrared thermal imager to display the location, shape and size of the defect through the display of bright areas.

[0005] Further improve the technical solution: use the metal composite strip as the dividing line, set the eddy current probe and the infrared thermal imager on opposite sides, and use the infrared thermal imager to display the location, shape and size of the defect through the display method of dark area.

[0006] Further improve the technical solution: There are two infrared thermal imagers, with the metal composite strip as the dividing line. One infrared thermal imager is set on the same side as the eddy current probe, and the other infrared thermal imager is set on the opposite side of the eddy current probe.

[0007] Further improvements to the technical solution: The infrared thermal imager is connected to a video acquisition card, a computer, and a monitor.

[0008] Further improve the technical solution: The eddy current probe is connected to the computer through the flaw detection control circuit.

[0009] After implementing the above technical solution, the beneficial effects of this utility model compared with the prior art are: This invention relates to a non-destructive testing device comprising an eddy current probe and an infrared thermal imager. The eddy current probe can detect not only the presence of defects within the copper-aluminum composite strip but also the depth of the defects, thereby determining whether the defects are located on the copper strip side, the aluminum strip side, or between the copper and aluminum composite surfaces. The infrared thermal imager utilizes the heating effect of the eddy current probe on the copper-aluminum composite strip to display the location, shape, and size of the defects. The combined use of the eddy current probe and the infrared thermal imager allows for the determination of the source and cause of defects, providing a basis for the non-destructive production of metal composite strips. Attached Figure Description

[0010] Appendix Figure 1 The diagram shown is a structural schematic of the metal composite eddy current infrared combined flaw detection device in Example 1.

[0011] Appendix Figure 2 The diagram shown is a schematic of bright area imaging.

[0012] Appendix Figure 3 The diagram shown is a structural schematic of the metal composite eddy current infrared combined flaw detection device in Example 2.

[0013] Appendix Figure 4 The diagram shown is a schematic of dark area imaging.

[0014] Appendix Figure 5 The diagram shown is a structural schematic of the metal composite eddy current infrared combined flaw detection device in Example 3.

[0015] In the attached diagram: 1. Active roller; 2. Passive roller; 3. Copper-aluminum composite belt; 4. Eddy current probe; 5. Infrared thermal imager; 6. Defect; 7. Localized high-temperature area; 8. Localized low-temperature area. Detailed Implementation

[0016] The preferred embodiments of this utility model are described below with reference to the accompanying drawings. Those skilled in the art should understand that these embodiments are only used to explain the technical principles of this utility model and are not intended to limit the scope of protection of this utility model. It should be noted that in the description of this utility model, terms such as "front," "rear," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings. This is merely for ease of description and does not indicate or imply that the device or element must have a specific orientation and positional relationship, and therefore should not be construed as a limitation of this utility model. It should also be noted that in the description of this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, it can refer to a fixed connection, a detachable connection, or an integral connection; it can refer to a mechanical connection or an electrical connection; it can refer to a direct connection or an indirect connection through an intermediate medium, or a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0017] A combined eddy current and infrared flaw detection device for metal composite strips relates to the field of metal strip flaw detection technology. It is mainly used to solve the problem that eddy current testing cannot detect the type, size, and specific location of defects in existing technologies. The composition and working principle of this invention are described in detail below.

[0018] Example 1: Refer to Appendix Figure 1 The metal composite belt eddy current infrared combined flaw detection device of this utility model mainly consists of a conveying mechanism, an eddy current probe 4, and an infrared thermal imager 5. In this embodiment, the metal composite belt is a copper-aluminum composite belt 3. The conveying mechanism consists of a pair of active rollers 1 and a pair of passive rollers 2 arranged vertically, with the copper-aluminum composite belt 3 sandwiched between the pair of active rollers 1 and the pair of passive rollers 2. During operation, the motor drives the pair of active rollers 1 to rotate in opposite directions, causing the copper-aluminum composite belt 3 to move from the side of the passive rollers 2 to the side of the active rollers 1. Because the passive rollers 2 have a hindering effect on the movement of the copper-aluminum composite belt 3, the copper-aluminum composite belt 3 is horizontally taut between the pair of active rollers 1 and the pair of passive rollers 2.

[0019] An eddy current probe 4 is positioned between the active roller 1 and the passive roller 2, closer to the passive roller 2, to detect defects in the copper-aluminum composite strip 3. The eddy current probe 4 contains an excitation coil and a detection coil. The excitation coil induces eddy currents within the copper-aluminum composite strip 3, while the detection coil detects electrical signals based on changes in the eddy currents, thereby detecting the presence of defects within the copper-aluminum composite strip 3. The advantage of eddy current testing is that it can detect not only the presence of defects within the copper-aluminum composite strip 3 but also the depth of the defects, thus determining whether the defects are located on the copper strip side, the aluminum strip side, or between the copper and aluminum composite surfaces. The disadvantage of eddy current testing is that it cannot display the shape, size, or specific location of defects.

[0020] The infrared thermal imager 5 is positioned between the active roller 1 and the passive roller 2, closer to the active roller 1. Although the infrared thermal imager 5 cannot detect the depth of defects, it can utilize the heating effect of the eddy current probe 4 on the copper-aluminum composite strip 3 to display the location, shape, and size of defects. It is known that eddy currents can heat magnetic and electrical metals. If defects such as cracks, pores, or impurities exist within the metal, the temperature and infrared radiation intensity at the defect location will be lower than those at other locations. In this case, the infrared thermal imager 5 can display the location, shape, and size of the defects based on the temperature field distribution.

[0021] See attached document Figure 2 In this embodiment, the copper-aluminum composite strip 3 serves as the dividing line, and the eddy current probe 4 and the infrared thermal imager 5 are positioned on the same side above the copper-aluminum composite strip 3. If a defect 6 exists within the copper-aluminum composite strip 3, the defect 6 will block the conduction of heat energy to the lower part of the copper-aluminum composite strip 3, causing heat energy to accumulate between the defect 6 and the upper surface of the copper-aluminum composite strip 3, forming a local high-temperature area 7. At this time, the local high-temperature area 7 appears as a bright area in the thermal imaging of the infrared thermal imager 5. Then, the position, shape, and size of the defect 6 can be determined based on the position, shape, and size of the bright area.

[0022] Please refer to the appendix again. Figure 1 To facilitate defect observation, the infrared thermal imager 5 is connected to a video acquisition card, a computer, and a monitor, while the eddy current probe 4 is connected to the computer via a flaw detection control circuit. Thus, the eddy current testing signal, the location, shape, and size of the defects can be visually observed on the monitor.

[0023] Example 2: Refer to Appendix Figure 3 In this embodiment, the copper-aluminum composite strip 3 serves as the dividing line, with the eddy current probe 4 and the infrared thermal imager 5 positioned on opposite sides. The eddy current probe 4 is positioned above the copper-aluminum composite strip 3, and the infrared thermal imager 5 is positioned below the copper-aluminum composite strip 3.

[0024] See attached document Figure 4If a defect 6 exists within the copper-aluminum composite strip 3, the defect 6 will block the conduction of heat energy to the lower part of the copper-aluminum composite strip 3. A local low-temperature zone 8 will be formed between the defect 6 and the lower surface of the copper-aluminum composite strip 3. At this time, the local low-temperature zone 8 will appear as a dark area in the thermal imaging of the infrared thermal imager 5. Then, the location, shape and size of the defect 6 can be determined based on the location, shape and size of the dark area.

[0025] Example 3: Refer to Appendix Figure 5 In this embodiment, two infrared thermal imagers 5 are provided, with the copper-aluminum composite strip 3 as the dividing line. One infrared thermal imager 5 and the eddy current probe 4 are positioned above the copper-aluminum composite strip 3, and the other infrared thermal imager 5 is positioned below the copper-aluminum composite strip 3. The infrared thermal imager 5 located above the copper-aluminum composite strip 3 displays the location, shape, and size of the defect through a bright area display method, while the infrared thermal imager 5 located below the copper-aluminum composite strip 3 displays the location, shape, and size of the defect through a dark area display method. In this way, by comparing the images of the bright and dark areas, the location, shape, and size of the defect can be displayed more comprehensively.

[0026] It is worth noting that the content not described in detail in the above embodiments is prior art. It is also worth noting that any additions, subtractions, substitutions, and improvements made by those skilled in the art based on the structure and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A metal composite belt eddy current infrared combined flaw detection device, characterized in that, include: The conveying mechanism consists of a pair of driving rollers and a pair of driven rollers, and the metal composite belt moves from the side of the driven rollers to the side of the driving rollers; An eddy current probe is placed between the active roller and the passive roller, and closer to the passive roller, to detect defects in the metal composite strip. An infrared thermal imager is positioned between the active roller and the passive roller, and closer to the active roller. It uses the heating effect of an eddy current probe on the metal composite strip to display the location, shape, and size of defects.

2. The metal composite eddy current infrared combined flaw detection device as described in claim 1, characterized in that, Using the metal composite strip as the dividing line, the eddy current probe and the infrared thermal imager are set on the same side. The infrared thermal imager displays the location, shape and size of the defect through the display of bright areas.

3. The metal composite belt eddy current infrared combined flaw detection device as described in claim 1, characterized in that, Using the metal composite strip as the dividing line, the eddy current probe and the infrared thermal imager are set on opposite sides. The infrared thermal imager displays the location, shape, and size of the defect through the display method of dark areas.

4. The metal composite belt eddy current infrared combined flaw detection device as described in claim 1, characterized in that, Two infrared thermal imagers are provided, with the metal composite strip as the dividing line. One infrared thermal imager is set on the same side as the eddy current probe, and the other infrared thermal imager is set on the opposite side of the eddy current probe.

5. The metal composite belt eddy current infrared combined flaw detection device as described in claim 1, characterized in that, The infrared thermal imager is connected to a video capture card, a computer, and a monitor.

6. The metal composite belt eddy current infrared combined flaw detection device as described in claim 5, characterized in that, The eddy current probe is connected to the computer via a flaw detection control circuit.

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