Ultrasonic testing device and method for fully covered steel plate

Abstract

The invention discloses a steel plate full covering supersonic wave detection device, and a method. The steel plate full covering supersonic wave detection device comprises a mechanism capable of walking on a steel plate freely, a multichannel supersonic wave flaw detector, a plurality of probes which are connected with the multichannel supersonic wave flaw detector in corresponding connection andare arranged in linear arrays, a laser movable inductor, a coupling device, a host computer, and a power source; the axis of the probes is vertical to a steel plate plane to be detected; the multichannel supersonic wave flaw detector is used for controlling the probes to send / receive supersonic wave signals, performing analog-to-digital conversion, and sending signals to the host computer; the laser movable inductor is connected with the plurality of probes in linear arrays and the host computer respectively; the host computer is used for obtained real-time two-dimensional position signals from the laser movable inductor for subsequent defect signal analysis, processing, and positioning; the coupling device is used for supplying the probes in linear arrays with a couplant; the power supply is used for providing the multichannel supersonic wave flaw detector, the host computer, and the laser movable inductor with electricity. The advantages are that: detection transverse resolution isincreased, and rapid, accurate, and comprehensive detection of steel plate internal defects is realized based on the limit number of the probes of a conventional portable steel plate detection vehicle.

Description

technical field [0001] The invention relates to a method for realizing full-coverage detection of steel plates by using a linear array multi-probe ultrasonic detection device. Background technique [0002] Ultrasonic testing is that the ultrasonic transducer generates ultrasonic pulse waves under the excitation of a high-frequency signal vibration source. The ultrasonic pulses are incident into the measured object through the coupling agent and propagate in it. The (defect) part of the incident ultrasonic pulse can be reflected or scattered, and the size, position or type of the defect can be evaluated according to the signal characteristic values ​​such as the amplitude and propagation time of the received reflected signal. When the ultrasonic wave propagates in the measured object with different material properties, the energy distribution of the ultrasonic wave can follow the changes in the internal structure and unknown defects of the test piece to produce corresponding ...

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Problems solved by technology

The existing related flaw detection vehicles have the following deficiencies: 1) Most of the existing vehicles adopt the method of arranging multiple ultrasonic probes, although the detection efficiency can be improved by increasing the detection area; Depends on the distance between two adjacent probes, and transverse defects are easy to detect but longitudinal defects are not easy to detect; 2) The detection data of this type of flaw detection vehicle requires one-to-one correspondence between ultrasonic data and defect positions on the steel plate. There are requirements for the positioning accuracy of the trolley. In order to improve the accuracy, the methods adopted by the existing technology are: a. At present, some trolleys adopt the way of erecting tracks to improve the positioning accuracy of the detection, which reduces the control program of the trolley to a certain extent, but Due to the limited conditions of the track, it is necessary to design different types of tracks to adapt to different sizes of steel plates, which increases the cost of the trolley and increases the preparation time in the early stage of inspection; b. Some trolleys use coaxial encoders, and high-precision encoders are installed on the driving wheels. In order to collect displacement data, since the water film is required for coupling during steel plate detection, the friction force between the driving wheel and the steel plate surface is reduced, which is prone to slipping, and it is difficult to realize the walking track through the movement difference of the two wheels during the turning process of the trolley. High-precision calculation; c. Some cars use visual positioning, which requires markers. Due to water stains on the surface of the steel plate, markers cannot be set on the surface of the steel plate, and the visual imaging system has distortion, which causes a large error in positioning

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