Eddy current high/low-frequency compound detection equipment for seamless steel tubes

Abstract

The invention discloses eddy current high/low-frequency compound detection equipment for seamless steel tubes. The equipment comprises an electric control system, front and rear roller paths, a positioning pressure wheel device, a three-roller centering device, a lifting device, magnetizing devices, a flaw detection instrument, a demagnetizer, a stand and a blanking frame. The steel tubes to be detected stably enter into the pressure wheel device, the three-roller centering device and the two magnetizing devices through the transmission roller paths controlled by the electric control system for finishing full coverage detection of the steel tubes; the flaw detection instrument is used for displaying detection results; and the steel tubes enter into the demagnetizer and the stand for demagnetizing the steel tubes, finally enter into the blanking frame and are automatically separated and stored in qualified and unqualified product storage tanks. The equipment has the beneficial effects that each magnetizing device is equipped with a high-frequency probe and a low-frequency probe for on-line detection, so that the detection effect and the working efficiency are improved and the missing detection risk is lowered.

Description

technical field [0001] The invention relates to flaw detection equipment for seamless steel pipes, in particular to flaw detection equipment using eddy current technology. Background technique [0002] The main material for the production of bearings is seamless steel tubes. The current testing technology for the surface quality of seamless steel tubes is to use through-type eddy current flaw detection equipment. The eddy current magnetic field will be generated on the surface. When the steel pipe is found to be defective, the eddy current magnetic field will change, resulting in a change in the impedance or induced voltage of the detection coil (probe). Judgment, confirm whether there are defects and the size of the defects, but when the direction of the defects on the seamless steel pipe is parallel to the direction of the eddy current, the detection sensitivity is difficult to find the defects, and it is not sensitive to the discontinuous defects on the inner surface, esp...

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Problems solved by technology

[0002] The main material for the production of bearings is seamless steel tubes. The current testing technology for the surface quality of seamless steel tubes is to use through-type eddy current flaw detection equipment. The eddy current magnetic field will be generated on the surface. When the steel pipe is found to be defective, the eddy current magnetic field will change, resulting in a change in the impedance or induced voltage of the detection coil (probe). Judgment, confirm whether there are defects and the size of the defects, but when the direction of the defects on the seamless steel pipe is parallel to the direction of the eddy current, the detection sensitivity is difficult to find the defects, and it is not sensitive to the discontinuous defects on the inner surface, especially when the wall thickness is It is more difficult to identify defects on the inner surface of steel pipes above 4.0mm

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