Large portal crane beam deformation measuring method based on image and geometric contour

Abstract

The invention discloses a large portal crane beam deformation measuring method based on an image and a geometric contour. The method comprises the following steps of firstly, acquiring different contour lines of a crane beam to obtain sequence image data; carrying out data preprocessing, and extracting the contour lines of the crane beam in the image; computing initial values of the length, the width and the center coordinates of a rectangular cross section of the crane beam; selecting a corresponding photo from a photo sequence through the transverse length of the given crane beam; carrying out iterative computation to obtain the length, the width and the center coordinates of a transverse section of the crane beam; and finally, carrying out subsequent analysis and decision-making on theobtained data. The method is low in requirement for personnel for field measurement, and does not need to have a relatively high skill requirement for field measurement like a traditional measuring method, and a relatively high measurement precision is kept for a long time; and the method is obtained by strict mathematical calculation, so that the whole process is stricter.

Description

technical field [0001] The invention belongs to the technical field of engineering measurement and relates to a method for accurately monitoring the deformation of a beam of a large gantry crane, in particular to a method for measuring the deformation of a beam of a large gantry crane based on an image and a geometric profile. Background technique [0002] With the continuous improvement of my country's industrialization level, the manufacturing capacity of large-scale equipment has been rapidly improved. The large-scale gantry crane is one of the essential equipment in the large-scale equipment manufacturing process, which is of great significance to industrial production. Gantry crane is a common crane built on a gantry, mainly used for hoisting and handling of large objects, such as in shipyards and ports. If the main beam of the gantry crane breaks during the hoisting operation, it may cause inestimable losses to people's lives and property. In order to ensure the safe...

AI Technical Summary

Problems solved by technology

[0003] Compared with other large-scale steel structure machinery and equipment, large-scale gantry cranes have their own characteristics that make deformation measurement more complicated and difficult. These characteristics are as follows: 1. The offset of the centerline of the main girder of the crane cannot be directly measured, and can only be measured indirectly

2. The outer surface of the crane is uniformly painted, so it lacks texture features, which will make it very difficult to match the points of the same name in the traditional photography forward intersection work

3. Due to the structure of the crane, there are places on the main girder of the crane that cannot be reached or are dangerous to reach manually, so it is difficult to affix mark points or install auxiliary measuring tools on the crane

4. The site where the crane works is generally very busy, and a lot of monitoring needs to be carried out on the load of the object to be measured, so the monitoring of the deformation needs to be completed quickly without affecting the production and damaging the equipment for a long time

Using this method, it will take a lot of time to measure the site, and at the same time, the surveyors are required to align the marker points or the scale of the tower ruler every time, so this will require a lot of professional work, and multiple observations are required to measure each measurement data. This will require more on-site measurement time

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