Method and device for measuring center point of pipeline end face

Abstract

The invention provides a method and device for measuring pipeline end face central points. The method includes the steps that an image of a pipeline with a target is collected; image coordinates of geometric centers of multiple mark points are acquired from the collected image; according to the relative positions of the mark points on a target plane, a target coordinate system is established, and coordinates of the mark points in the target coordinate system are acquired; according to the image coordinates of the geometric centers of the mark points and the coordinates of the mark points in the target coordinate system, the transformation relation between the target coordinate system and a camera coordinate system is acquired; according to the transformation relation between the target coordinate system and the camera coordinate system, coordinates of joint end face central points of the pipeline in the camera coordinate system are acquired; according to the coordinates of the joint end face central points of the pipeline in the camera coordinate system, the relative positions between the joint end face central points of the pipeline are acquired. By the adoption of the scheme, the speed and accuracy are high when the relative positions of the joint end face central points of the pipeline are measured.

Description

technical field [0001] The invention relates to the technical field of optical measurement, in particular to a method and device for measuring the center point of an end face of a pipeline. Background technique [0002] Pipelines are widely used in complex mechanical and electrical products in aviation, aerospace, special vehicles and other industrial fields. Whether they can be installed reliably or not directly affects product quality. At present, one of the most direct and effective means to ensure the quality of pipeline processing and to achieve stress-free assembly in engineering is still to obtain the direction of the intermediate conduit in the pipeline and the relative position of the endpoints of the pipeline through the physical inspection of the pipeline after welding. Coordinates, and accurate correction is made on this basis. [0003] In the prior art, the measurement of the position of the center point of the end face of the pipeline joint includes: tradition...

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Problems solved by technology

[0005] To sum up, no matter it is the traditional method or the currently widely used three-coordinate measuring machine, laser tracker, etc. for the measurement of pipeline endpoints, the common disadvantage is that too much reliance on human operation leads to low measurement efficiency. The position of the end point of the road cannot be directly measured. In engineering, the outer circle of the end face of the pipeline is usually measured first, and then the coordinates of the geometric center position are calculated. However, the measurement of the outer circle is affected by the quality of the image, making it difficult to guarantee the measurement accuracy, which affects the calculation. Accuracy of the resulting geometric center

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