An eddy current testing device for fine defects on the surface of short stainless steel seamless tubes
A seamless short tube and eddy current detection technology, which is applied in the direction of measuring devices, instruments, scientific instruments, etc., can solve the problems of uncertainty of detection results, easy change of lifting distance, etc., and achieve fast adjustment, fast installation, and reliable guarantee sexual effect
Active Publication Date: 2022-05-27
SHANGHAI INST OF TECH
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Problems solved by technology
During the engineering inspection process, due to the influence of the position change of the eddy current point probe, the excessive cylindricity of the seamless steel pipe, and the excessive straightness of the seamless steel pipe, etc., the lift-off distance is easy to change, and a small change will bring a very large impact on the detection signal. impact, and ultimately lead to the uncertainty of the test results
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[0039] In order to make the objectives, technical solutions and advantages of the present invention clearer, each embodiment of the present invention will be described in detail below with reference to the accompanying drawings.
[0040] Please refer to the following Figure 3 to Figure 14, an eddy current detection device for fine defects on the surface of a stainless steel seamless short tube, including a connecting mounting plate 1, a moving guide rod 4, a rotation limit plate 17, a compression spring 3, a mounting bracket 5, a removable plate 6, and a V-shaped block 10 and eddy current point probes 15 . The connection mounting plate 1 is fixedly connected to the external drive mechanism. One end of the moving guide rod 4 is fixedly connected to the rotation limiting plate 17 for limiting the downward movement of the moving guide rod 4 through the connection mounting plate 1 , and the other end is fixedly connected to the mounting bracket 5 . The compression spring 3 is s...
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The invention discloses an eddy current detection device for fine defects on the surface of a short stainless steel seamless tube, wherein a connecting mounting plate is fixedly connected with an external driving mechanism; The rotation limit plate is fixedly connected, and the other end is fixedly connected with the mounting bracket; the compression spring is set on the moving guide rod to apply the downward pressure of the mounting bracket; the detachable plate is detachably connected with the mounting bracket; the V-shaped block and the movable The disassembly plate and the installation bracket are connected by rotation; the bottom of the V-shaped block has a V-shaped groove; the eddy current point probe is located in the central area of the V-shaped block, and is set outwards facing the bottom of the V-shaped groove; the V-shaped groove is used for locking On the surface of the tested stainless steel seamless short pipe. The invention ensures that the lift-off distance of the eddy current point probe remains consistent during the detection process, avoids the influence of the lift-off effect during detection, and finally ensures the reliability of the detection result.
Description
technical field [0001] The invention belongs to the technical field of eddy current non-destructive testing, and in particular relates to an eddy current testing device for fine defects on the surface of a stainless steel seamless short tube. Background technique [0002] Eddy current flaw detection is one of the main detection methods for the outer wall defects of stainless steel seamless short pipes. It has the advantages of fast detection speed and high detection sensitivity, and it does not need to detect coupling medium and does not pollute the environment. It has been widely used. The two most commonly used detection methods for eddy current flaw detection are through flaw detection and point flaw detection. figure 1 and figure 2 shown: [0003] When the through-type flaw detection is used, the stainless steel seamless steel pipe can pass through the inner hole of the probe at a high speed to complete the flaw detection; when the point-type flaw detection is used, s...
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IPC IPC(8): G01N27/9093
CPCG01N27/902
Inventor 侯怀书焦超飞潘国成
Owner SHANGHAI INST OF TECH