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Large Diameter Steel Pipe Automatic Detection of Mechanical Structure

In the automatic detection, the lift-off effect and impact on the stability of the coupling layer testing is often the most difficult issues. In the automatic detection, the lift-off effect and stable coupling layer is the main cause of missed and false positives. 

Whether missed or misreported, affect detection reliability. For a long time, in the practical application of the automatic detection, since the lift-off fluctuation detection reliability or because of the problem of declining water coupling layer thickness variations, has been plagued by the normal use of this technology "bottleneck." 
Typically, the way to solve the lift-off effects are: mechanical probe tracking method, the probe coil bridge connection, changing the capacitance value and the detection coil LC circuit using multi-frequency detection technology. In addition to the mechanical tracking method, several other solutions by improving the probe to be achieved and equipment, but only improved mechanical tracking probe holder, to prevent lift-off variation of the gap. In practical industrial applications, the probe mechanical tracking method is the most commonly used method to overcome the effects of lift-off effects. Common probe mechanical tracking mode, there are two: one is to limit the use of roller and cylinder or spring pushing a combination of methods that maintain a constant distance between the detection probe and the surface was seized. Although this method for inhibiting the lift-off effect can play a better role, but it will increase noise and vibration. Another, using the probe mechanical tracking approach is the use of distance measuring probes measure the volatility of timely detection probe lift-off clearance and ranging signals used to control and drive a stepper motor driven devices such as power detection probe action to ensure that the gap between the probe and the workpiece was seized constant. This method is applicable to other flat plate 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 the method of secondary spring pushing so always keep a certain distance between the detection probe and the surface was seized. From the experimental results, with the dynamic nature of the probe are relatively strong, the basic guarantee for the distance between the probe and the pipe surface to be detected between the constant testing also achieved good results. Typically, the way to solve the water coupling layer are: fixed sink boxes, stable water spray devices. As a result of rotation of the probe along the way pipe, seamless steel pipe length is generally around 10m. Must therefore be considered stable aqueous spray means such as to increase the diameter of the flow port, reducing the height of the flow pipe inlet and to reduce spray. Current conventional solutions can only be so, but the effect is resolved within an acceptable range. 

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