Calibration device for thin strip internal defect detection equipment
A technology for internal defects and detection equipment, applied in the direction of material magnetic variables, etc., can solve the problem of no public detection equipment calibration, and achieve the effect of ensuring sensitivity, broad application prospects, and avoiding detection errors.
Inactive Publication Date: 2015-04-15
BAOSHAN IRON & STEEL CO LTD
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Problems solved by technology
[0006] European patent EP2450700A1 and US patent US2012 / 0109565A1 provide a general method for detecting object defects by the magnetic flux leakage method. They do not disclose the relevant discussion on how to calibrate the detection equipment, but only a simple realization and conception of the detection principle , and provides relevant signal waveform diagrams, etc., and does not involve calibration-related content
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[0021] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.
[0022] see Figure 1 to Figure 3 , a calibration device for thin strip internal defect detection equipment, including a detection probe 1, a calibration roller 2, a calibration template 3, a magnetization device 4, a servo motor controller 5, a guide rail 9, a signal acquisition card 6, a computer 7, and a sensitivity Regulating module 8 and driving motor 10;
[0023] The drive motor 10 drives the calibration roller 2 to rotate, and the calibration template 3 is installed on the calibration roller 2. The magnetization device 4 uses DC magnetization to magnetize the calibration template 3 to deep saturation, and the detection probe 1 approaches with a certain lift-off value. Calibration sample 3, generally the distance between the detection probe 1 and the calibration roller 2 is the standard lift-off value.
[0024] The detection probe 1 is i...
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The invention discloses a calibration device for thin strip internal defect detection equipment. A drive motor (10) drives a calibration roller (2) to rotate, a calibration templet (3) is installed on the calibration roller, a magnetization apparatus (4) magnetizes the calibration templet, a detection probe (1) is close to the calibration templet and includes a plurality of sensors; a servo motor controller (5) controls a servo motor in terms of driving the detection probe to move along a guide rail (9) by one sensor width each time, the signal output end of the detection probe is connected to the input end of a signal acquisition card (6), the data acquisition card output end is connected to the serial port of a computer (7); the computer performs processing on the detection signal, then compares the detection result with a set value, and outputs the result to a sensitivity adjustment module (8), which adjusts the signal amplification coefficient. The calibration device provided by the invention can realize offline calibration of the magnetic sensors in the detection probe, and maintains the detection ability of the detection probe consistent.
Description
technical field [0001] The invention relates to a magnetic flux leakage detection technology, in particular to a calibration device used for detection equipment for internal defects of thin strips. Background technique [0002] Strip internal defects are one of the main quality defects of cold-rolled thin strip products, especially for special-purpose strip products such as DI (tinned sheet) and battery steel. In this kind of strip steel products, if there are internal defects, it will lead to risks such as leakage, which will cause great quality disputes to downstream manufacturers and bring a lot of unnecessary troubles. Therefore, in some cold-rolled strip steel production lines, internal quality defects must be checked during the production process to prevent defective products from being delivered to users. Since the production of cold-rolled strip products is a high-speed and automated process, there is a sampling risk in the offline inspection of products. [0003] ...
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IPC IPC(8): G01N27/83
Inventor 何永辉石桂芬吴首民梁爽彭铁根宗德祥杨水山
Owner BAOSHAN IRON & STEEL CO LTD