Detection method for sphere similarity of machine-made sand

Abstract

The invention relates to a detection method for sphere similarity of a machine-made sand. The method comprises the following steps: 1) sampling, concretely randomly getting machine-made sand particles with a same production batch and different grades, and putting the sampled machine-made sand particles on a clean glass plate; 2) acquiring digital images, concretely shooting the sampled machine-made sand particles from different directions by using a digital camera, and acquiring the digital images of the machine-made sand particles at various directions; 3) pretreating the digital images to obtain two-dimension images; 4) acquiring the circularity of a same machine-made sand particle at various directions in the two-dimension image, and acquiring the sphere similarity of the machine-made sand particle according to the circularity at various directions; and 5) acquiring the sphere similarity of all of the sampled machine-made sand particles one by one, gathering the sphere similarity of the multiple sampled machine-made sand particles, and averaging, so as to obtain the sphere similarity of the machine-made sand particles produced in a same batch. Compared with the prior art, the method possesses the advantages of being simple, accurate, advanced and the like.

Description

technical field [0001] The invention relates to the technical field of building materials, in particular to a method for detecting the similarity of machine-made sand spheres. Background technique [0002] At present, the annual output of sand in my country is as high as more than 700 million tons, most of which are natural sand. Natural sand is a local resource, which has the characteristics of uneven distribution, non-renewable in a short time, and unsuitable for long-distance transportation. The production of machine-made sand has largely alleviated the contradiction between the supply and demand of natural sand, but in order to ensure the reliability of the quality of machine-made sand, it is necessary to evaluate its particle morphology. [0003] Machine-made sand particles are irregular in shape, so it is difficult to fully define and measure them. There are mainly the following indicators to describe the shape characteristics of machine-made sand particles: [0004]...

AI Technical Summary

Problems solved by technology

[0009] Chinese patent CN103063558A discloses a method for evaluating the shape of machine-made sand particles. This method uses digital image processing technology to evaluate the shape of machine-made sand particles for the first time, and combines experiments to evaluate the shape of machine-made sand particles from two-dimensional and three-dimensional. Compared with the above method, it provides a convenient, rapid, accurate and objective evaluation method for the particle shape of machine-made sand. However, the calculation of the two-dimensional circular coefficient involved in the patent, on the one hand, this method cannot effectively evaluate the three-dimensional spherical particle shape. On the other hand, the calculation results of the circular coefficient are relatively close, and it is impossible to accurately divide the circularity range of different quality sands and accurately evaluate the quality of the sand. However, the characterization of the three-dimensional spherical particle morphology in the patent involves more three-dimensional features. parameters, and the extraction and calculation of these parameters, on the one hand, the test is cumbersome, on the other hand, the accuracy cannot be guaranteed, so the operation is inconvenient and inaccurate

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