Measuring ruler for ultrasonic detection of defects

Abstract

The invention discloses a measuring ruler for ultrasonic detection of defects, and the measuring ruler comprises a sliding rail, a photoelectric device, a clamping device and a counting roller; the sliding rail is used for limiting the direction and comprises a slideway body and a rail lengthening part; the photoelectric device is used for positioning and comprises a laser head, a beam splitter prism and a liquid crystal display module; the clamping device is used for clamping a probe and comprises a pair of symmetrical clamping plates, and the two clamping plates are rigidly connected into anintegral structure through a connecting part. The counting roller is used for measuring the length and comprises two roller frames arranged on the opposite sides, and the two sides of each roller frame are each provided with two rollers. The probe and the straight ruler are fixed through a groove, so the problem that a measurement base point is inaccurate is solved; the defect position is determined through laser and the sliding rail, and the detection precision and accuracy are greatly improved. The permanent magnets are arranged at multiple positions, and the probe and the measuring ruler can be fixed to a workpiece, thereby facilitating the detection operation, and reducing the manual assistance.

Description

technical field [0001] The invention relates to a measurement and positioning device for ultrasonic detection of defects, in particular to an ultrasonic detection for welding seams, which belongs to the field of non-destructive testing. Background technique [0002] Ultrasonic testing is one of the most commonly used non-destructive testing methods. A-type pulsed ultrasonic testing is widely used in energy and power, petrochemical, railway, shipbuilding, and machinery due to its advantages of portable equipment, simple operation, high detection rate, and low cost. Manufacturing and other industries. During the ultrasonic inspection of the inclined probe, the defect is scanned by the ultrasonic waves emitted by the inclined probe; after the detector obtains the signal of the reflected wave of the defect, it uses the probe as a reference to locate the defect and measure the length with an ordinary steel ruler; then the workpiece Defects in the quality classification. It main...

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Problems solved by technology

[0003] At present, there are mainly the following disadvantages in the determination of steel ruler defects: 1) There is no corresponding interface between the ruler and the probe, and there is no fixed base point for the placement of the ruler when calibrating the probe and actually

Increased error; 2) When the probe is obliquely parallel to scan, the angle of the ruler cannot be fixed accurately, and the measurement error of the defect is relatively large; 3) When the probe moves, the steel ruler is difficult to operate, and the steel ruler is seriously reduced. 4) When inspecting on the upside, the line of sight is blocked, and it is difficult to place a steel ruler when marking defects

When recording defects, it is impossible to achieve single-person operation and needs assistance; 5) When detecting large pipelines, the measuring range of the ruler is often insufficient, and the secondary measurement increases the error value: 6) When the workpiece is a cylindrical or circular weld, If the curvature is small, the steel ruler cannot determine the circumferential position of the defect

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