Portable surface defect detection device and method based on laser displacement ranging

Abstract

The invention discloses a portable surface defect detection device and method based on laser displacement ranging. An x-axis measurement mechanism comprises a body, the front end of the body is provided with a ball screw, and one end of the ball screw is connected with a servo motor on one side of the body; a y-axis measuring mechanism comprises a mounting seat, a telescopic table is arranged on the mounting seat, a laser displacement sensor is mounted at the last stage of the telescopic table, and telescopic quantity scales are arranged on the telescopic table; the rear end of the mounting seat is connected with a ball seat on the ball screw; and a left supporting frame and a right supporting frame are arranged below the body. The detection device provided by the invention is simple in component composition, convenient to carry and use, capable of realizing depth and shape contour detection, and high in automation degree, low in cost and complete in function compared with a traditional measuring tool and a precision measuring instrument.

Description

technical field [0001] The invention relates to a portable surface defect detection device and method based on laser displacement ranging, belonging to the technical field of laser measurement. Background technique [0002] The laser displacement sensor can use the characteristics of high directivity, high monochromaticity and high brightness of the laser to realize non-contact long-distance measurement. Using these advantages of the laser can greatly improve the accuracy and reliability of the displacement measurement, which is also a great Contact measurement provides an effective method. [0003] At present, the depth data measurement of defects such as wear, corrosion, and scratches mostly uses digital display pit depth gauges or traditional measurement tools such as dial indicators, vernier calipers, and depth gauges to conduct contact measurements on defects. On the one hand, it affects Detection accuracy, on the other hand, scratches the workpiece and damages the equ...

AI Technical Summary

Problems solved by technology

[0005] (1) Using a vernier caliper or a pit meter to measure, the defect depth data can be obtained, but the defect contour data cannot be obtained, and the contact measurement affects the detection accuracy; when the three-dimensional shape analyzer is used for testing, only the defects of small samples can be obtained Three-dimensional shape data, and the scanning speed is slow, expensive, and limited by environmental conditions, so it cannot be applied on-site;

[0006] (2) Using a dial gauge to detect the depth of a contact defect on the workpiece surface, the measurement accuracy is insufficient, and the contour of the defect cannot be obtained, and the operation is complicated;

[0007] (3) Scanning with a laser device has high defect detection capabilities, but the equipment is extremely expensive, and can only test small samples under laboratory conditions, and does not have the ability to detect workpiece defects under on-site working conditions

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