Automatic inspection mechanical structure of seamless titanium tube
Put the probe into a probe car and choose the method of two-stage spring jacking to keep a certain distance between the detection probe and the appearance of the workpiece under inspection.According to the test results, the probe has a strong follow-up, which basically ensures the stable distance between the probe and the appearance of the titanium tube being tested, and the flaw detection has also achieved a good result.Generally, the treatment of water coupling layer is mainly: fixed tank box, not disorderly water spray equipment.As the titanium tube rotating probe is selected to travel, the length of seamless titanium tube is generally about 10m.Therefore, it is necessary to consider the selection of non-random water injection equipment, such as adding the diameter of the flow port, reducing the height of the flow port and titanium pipe, to reduce the spray.The current conventional treatment can only be so, but the effect of the treatment is within the range of tolerance.
In general, the methods to deal with the lift-off effect mainly include: the mechanical tracking method of the probe, the bridge connection method of the probe coil, changing the capacitance value of LC loop of the detection coil and using multi-frequency detection skills.In addition to the mechanical shadowing method, other treatment methods can be completed by improving the probe and instrument, but the mechanical shadowing can only improve the probe holder to avoid the change of lifting off the gap.In practical industrial applications, the probe mechanical marking method is the most commonly used method to overcome the influence of lift off effect.
There are two common types of probe mechanical shadowing:
One is the choice of roller limit and cylinder or spring jacking method, so that the detection probe and the workpiece to be inspected the appearance of a stable distance.Of course, this method has a good effect on restraining the lift effect, but it will increase the oscillation noise.
Another way to select the probe's mechanical marking is to use the ranging probe to measure the shaking state of the probe's lifting out of the gap in time, and use the ranging signal to control and drive the stepping motor and other power equipment to test the probe, so as to ensure the gap between the probe and the workpiece under test is stable.
This method is used for plane scanning such as plate or billet. The defect is due to the slow reaction speed of mechanical action and the complexity.
In active flaw detection, the influence of lift off effect and undisturbed coupling layer on flaw detection is often the most popular title.In active flaw detection, lift off effect and undisturbed coupling layer are the main causes of missing detection and false alarm.No matter miss or false alarm, it will affect the reliability of the test.
For a long time, in the practice and application of active flaw detection, the title of the reliability of detection is reduced due to the lifting and shaking, or the thickness of water coupling layer is changed, which has been the "bottleneck" of the normal use of this skill.