Connecting rod weld joint detection system and method

Abstract

The invention discloses a connecting rod weld joint detection system which comprises a camera, a light source and a processor. The light source is used for emitting light beams irradiating the extension rod to be detected; the included angle between the axis of the light beam and the axis of the camera lens is between 25 degrees and 31 degrees; the axis of the to-be-detected extension rod is perpendicular to the plane where the beam axis and the camera lens axis are located. The camera is used for collecting black and white images of different axial positions of the extension rod to be detected rotating around the axis for a circle; a calibration extension rod weld joint black-white graph is stored in the processor; transverse scale lines are arranged in the middle of the calibration extension rod weld joint black-white graph; and the processor outputs a detection result signal according to the gray scale of the black-and-white image and the gray scale of the black-and-white graph of the calibration extension rod weld joint, wherein the black-and-white image rotates for one circle around the axis at different axial positions of the to-be-detected extension rod. The invention further discloses a connecting rod weld joint detection method. According to the invention, weld joint detection can be accurately, comprehensively and efficiently realized.

Description

technical field [0001] The invention relates to welding detection technology, in particular to a detection system and method for post weld seam. Background technique [0002] The quality inspection of the existing welding seam of the rod is mainly detected by eddy current testing. The workpiece is rotated, and the probe head is extended to the weld seam, and the distance is required to be 0.4mm. The roughness of the weld seam is detected, and the induction coil in the probe head generates current. The change, amplified by the tester, is finally converted to a percentage. This detection method mainly has the following disadvantages: [0003] (1) Unwelded parts cannot be judged. [0004] (2) Spiral welded parts cannot be judged. The failure is mainly due to the incomplete lap joint of the weld seam, and the starting and receiving points of the welding do not overlap, resulting in leakage and other problems [0005] (3) For welding holes, the diameter is required to be less...

AI Technical Summary

Problems solved by technology

[0003] (1) Unwelded parts cannot be judged

[0004] (2) Spiral welded parts cannot be judged

[0006] (4) The width of the weld seam and the relative position of the weld seam cannot be detected

For example, the fuel injector is a high-tech product. The process equipment of the production line is very complicated, and the welding process is even more complicated. The quality of welding will directly affect the life of the fuel injector. Among them, the welding of the post assembly is the most critical, and the post assembly It is mainly composed of the upper rod and the lower valve body. After the upper and lower press fit, it is welded by a laser machine to ensure the durability and sealing of the product. This component is equivalent to the cavity of the solenoid valve and the medium is gasoline. Once the quality of the weld is not enough close, it will cause leakage and other serious consequences

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