Three-dimensional photography technology based folded pipe field measurement method

Abstract

The invention discloses a three-dimensional photography technology based folded pipe field measurement method. The method comprises the following steps: (1) arranging a plurality of mark points on a flange and a pipe, and placing encoded points in a spatial position near to-be-measured flange and pipe; (2) performing multi-angle shooting around the pipe and the flange by using a camera or a video camera; (3) copying and storing all shot photos in a computer, and automatically and quickly calculating contour data and spatial relative position data of the pipe and the flange by utilizing three-dimensional photography software; (4) importing the obtained data into Geomagic software, and performing fitting modeling by utilizing the software to form required pipe and flange; and (5) performing analytic processing on 3D data by utilizing related three-dimensional drawing software, drawing a required folded pipe processing drawing, and outputting the drawing in a PDF format. The measurement method is simple, convenient and high in measurement precision, is slightly influenced by factors such as environment and the like, is not influenced by factors of space and light, and is relatively high in anti-jamming capability.

Description

technical field [0001] The invention relates to a method for on-site measurement of a closed pipe based on three-dimensional photography technology, which is applied to the manufacture and processing of the closed pipe. Background technique [0002] There are pipes everywhere in the ship, and a series of operations such as the design and manufacture of these pipe fittings and the inspection after installation in the ship are called "pipe laying". Usually ships are built in sections, and the pipelines between the sections need to be connected by closing pipes when the sections are closed. However, various closing pipes are manufactured by relying on the pipeline design drawings. On-site welding method. [0003] The most difficult thing in pipe production is "to ensure good precision of the finished product". However, when using the above two methods, it often occurs that the flange bolts of the closed pipe manufactured are not in the correct position, resulting in the failu...

AI Technical Summary

Problems solved by technology

However, the disadvantage of this measurement method is that it is necessary to repeatedly adjust the position of the rope exit during measurement to ensure that the pull rope is in a straight line. This operation process is cumbersome.

Since there is a certain gap between the pull rope and the pull rope head, it is ensured that the pull rope can be pulled out smoothly, resulting in a slight deviation in the position of the center axis of the pull rope head as the center of the ball, resulting in a deviation in the spatial position of the closed tube to be measured and due to the long-term pull rope effect of the stay rope, the elastic expansion and contraction of the stay rope causes the accuracy of closing to be greatly reduced, and the wear and tear of the stay rope causes the damage of the stay rope, which affects the performance and work efficiency of the measurement and increases the input of the cost. A simpler, higher measurement accuracy and less susceptible to interference portable closing pipe measurement method is what equipment manufacturers and equipment users are willing to look forward to

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