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For a long time, in the practical application of automated testing, since the lift-off fluctuations decreased detection reliability problems or due to changes in water coupling layer thickness, has been plagued by the normal use of this technology "bottleneck."(A) way to solve the water coupling layerFixed sink boxes, stable water spray devices. As a way forward Yixingguan rotating probe, shaped tube length is generally about 10m. Must be considered with a stable water jet apparatus, such as increasing the diameter of the flow port, to reduce the height of the flow orifice and the seamless steel pipe, to reduce spray.(B) probe mechanical tracking modeA is to limit the use of roller and cylinder or a spring pushing a combination of methods that maintain a constant distance between the probe and detected by the surface of the workpiece inspection. While this approach for inhibiting effect liftoff can play a better role, but at the same time will increase noise and vibration. Alternatively, the use of a mechanical probe tracking the way, is to use a ranging probe measure the fluctuations in time detection probe lift-off clearance, and with the ranging signal to control and drive a stepping motor driven by the power unit detecting probe operation, in order to ensure the gap between the probe and the subject of constant workpiece. This method is applicable to other flat sheet or billet scan testing, the disadvantage is due to the mechanical action of the reaction rate is slower, but also more complicated. The probe is a probe into the car, and to adopt a method of making a secondary spring pushing always maintain a certain distance between the detection probe and was seized Yixingguan surface. From the experimental results, with the dynamic nature of the probe is relatively strong, the basic guarantee of the distance between the probe and the pipe surface to be detected between the constant testing also achieved good results.(C) ways to solve the lift-off effectThere are mechanical tracking method probe, the probe coil bridge connection, change the capacitance value and the use of the detection coil circuit LC multi-frequency detection technology. In addition to the mechanical tracking method, several other solutions, by improving the probe and the instrument to be achieved, but only improved mechanical tracking probe holder, to prevent changes in lift-off of the gap. In Yixingguan practical applications, the probe mechanical tracking method is the most commonly used method to overcome the impact of the lift-off effect. Article Tags: Mechanical Tracking Method, Seamless Steel, Mechanical Tracking, Distance Between, Tracking Method
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