Method and device for measuring pipeline end face central points
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A center point and end face technology, which is applied to the measurement field of the center point of the pipe end face, can solve the problems of difficult to guarantee measurement accuracy, affect the geometric center accuracy, low measurement efficiency, etc. Effect
Active Publication Date: 2015-01-28
BEIJING INSTITUTE OF TECHNOLOGYGY
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[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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Embodiment 1
[0076] According to an aspect of an embodiment of the present invention, a method for measuring the center point of a pipeline end surface is provided, such as figure 1 As shown, the method includes:
[0077] Step S101 , collecting an image of a pipeline equipped with a target.
[0078] Before measuring the center point of the end face of the pipe, the target needs to be assembled on the pipe joint. Such as figure 2 As shown, a plurality of marking points are arranged on the target plane 7 of the target, and the target plane can be plexiglass, and is fixed on the target by a fixing part 8 . Seven mark points are set on the target plane 7 in the embodiment of the present invention. Wherein, a plurality of mark points include a large mark point 3 and a plurality of small mark points 10, the large mark point 3 is used to determine the origin of the target coordinate system, and the multiple small mark points 10 are used to determine the The coordinate axis direction of the t...
Embodiment 2
[0114] According to another aspect of the present invention, there is also provided a measuring device 400 for the center point of the pipeline end surface, such as Figure 4 As shown, the device includes:
[0115] An image acquisition module 401, configured to acquire an image of a pipeline equipped with a target, where a plurality of marker points are set on the target plane;
[0116] An image coordinate acquisition module 403, configured to obtain the image coordinates of the geometric centers of the plurality of marker points from the collected images;
[0117] A target coordinate system establishment module 405, configured to establish a target coordinate system according to the relative positions of the multiple marker points on the target plane, and obtain the coordinates of the multiple marker points in the target coordinate system;
[0118] The conversion relationship acquisition module 407 is configured to acquire the conversion relationship between the target coord...
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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 central point of a pipeline end face. Background technique [0002] Pipelines are widely used in complex electromechanical products in aviation, aerospace, special vehicles and other industrial fields, and whether they can be installed reliably directly affects product quality. At present, one of the most direct and effective means to ensure the quality of pipeline processing and realize stress-free assembly in engineering is still to obtain the direction of the intermediate conduit in the pipeline and the relative position of the pipeline end point through the physical inspection of the pipeline after welding Coordinates, on this basis for accurate correction. [0003] In the prior art, the measurement of the position of the center point of the end face of the pipe joint includes: traditional methods, such as profiling and laser...
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