Eddy current detecting device of seamless steel tubes

Abstract

The invention discloses an eddy current detecting device of seamless steel tubes, belonging to the technical field of tube detection. The eddy current testing device comprises a feeding platform, a conveying roller way, a first locating pinch roller, a flaw detection roller way, an eddy current testing device, a second locating pinch roller, a demagnetizing device, a marking seat and a discharging platform, which are sequentially installed on a rack, and an electric control device for controlling feeding and discharging as well as transferring, sorting and defect alarming of steel tubes. The eddy current detecting device is characterized by comprising a high frequency flaw detection device and a low frequency flaw detection device, wherein the high frequency flaw detection device comprises a high frequency magnetic saturation device A, a flaw detection probe A and a lifting device A, and the low frequency flaw detection device comprises a low frequency magnetic saturation device B, a flaw detection probe B and a lifting device B. The eddy current detecting device disclosed by the invention can be used for simultaneously detecting defects on inner and outer surfaces of tubes so as to improve the detection rate of defective steel tubes and further ensure good quality of the seamless steel tubes.

Description

technical field [0001] The invention relates to a detection device, in particular to an eddy current detection device for a seamless steel pipe, belonging to the technical field of pipe detection. Background technique [0002] my country is one of the largest bearing producing countries in the world, and the bearing products produced can meet more than 70% of the varieties required in the country, and the quantity reaches more than 90%. However, bearings with strict quality requirements and high technical added value, such as car bearings, high-speed and quasi-high-speed railway bearings, bearings for maintenance of various imported equipment, and some special bearings with high precision, high added value and used under special working conditions Bearings are highly dependent on imports. One of the reasons for this phenomenon is that the surface quality of bearing steel materials is difficult to meet the requirements, which directly affects the utilization rate of bearing ...

AI Technical Summary

Problems solved by technology

When the direction of the defect is parallel to the direction of the eddy current, the detection sensitivity is low or even difficult to find the defect

In addition, due to the skin effect of eddy currents, the higher the frequency, the higher the surface sensitivity, while the sensitivity to inner wall defects or near-surface defects is low

Conventional eddy current testing equipment currently used is only sensitive to discontinuous defects on the outer surface of steel pipes, but not to discontinuous defects on the inner surface, especially the inner surface defects of steel pipes with a wall thickness of 4.0mm or more are more difficult to identify

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