Seamless Steel Tube Automatic Flaw Detection Mechanical Structure

From the experimental results, the probe is relatively strong follow-up, the basic guarantee of the probe and the surface of the steel pipe between the detection of a constant, flaw detection also achieved good results. Usually, the solution to the water coupling layer are: fixed tank tank, no water spray device. Because the use of seamless steel pipe rotating probe forward way, the length of smls pipe is generally about 10m. Therefore, it is necessary to consider the use of non-water spray device, such as increasing the diameter of the flow port, reducing the flow port and the height of steel, reducing water. The current conventional solution can only be the case, but the effect is to be resolved within the acceptable range.

In general, the solution to the effect of the main approach are: the probe of the mechanical tracking method, the probe coil bridge connection, change the detection coil LC circuit capacitance and the use of multi-frequency detection technology. In addition to mechanical tracking, several other solutions are achieved by improving the probe and instrumentation, but mechanical tracking can only improve the probe holder to prevent changes in the separation gap. In practical industrial applications, probe mechanical tracking is the most commonly used method to overcome the effect of extraction.

Common probe mechanical tracking mode:
One is the use of roller limit and cylinder or spring push together the method, so that the detection of the probe and the workpiece surface to maintain a constant separation between. Although this method can inhibit the lifting effect can play a better role, at the same time will increase the vibration noise.

Another way to use the probe to track the machine is to use the distance measuring probe to measure the probe in time to detect the gap from the gap, and use the range signal to control and drive the stepper motor and other power devices to drive the detection probe action to ensure that The gap between the probe and the workpiece is constant.

This method is used for sheet or blank materials such as plane scanning test, the disadvantage is because the mechanical action of the reaction speed is relatively slow, but also more complex.

In the automatic flaw detection, the effect of extraction and non-coupling layer on the impact of detection is often the most difficult subject. In the automatic detection, the extraction effect and the non-coupling layer are the main reasons for the leakage test and false positives. Whether it is missed or false positives, affect the reliability of the test.

For a long time, in the practical application of automatic flaw detection, it has been a "bottleneck" that troubles the normal use of this technique because of the problem of degradation of detection reliability due to the fluctuation of the lift or because of the change in the thickness of the water coupling layer.