Machine-made particle-shaped evaluation method

Abstract

The invention discloses a machine-made particle-shaped evaluation method. The method comprises the following steps: (1) acquiring an image; (2) preprocessing the image; (3) extracting and calculating two-dimensional characteristic parameters of the image; (4) measuring apparent density and bulk density; and (5) extracting and calculating three-dimensional characteristic parameters of the image. The method has the characteristics of being convenient, quick, accurate and objective in evaluation result.

Description

technical field [0001] The invention relates to a particle shape evaluation method of machine-made sand, in particular, a method for evaluating the particle shape of machine-made sand from two-dimensional and three-dimensional by combining digital image processing and testing. Background technique [0002] Natural sand cannot be regenerated in a short period of time, natural sand resources are gradually reduced, localized, and distributed unevenly; the shape of machine-made sand particles is broken by machinery, with many flake particles, rough surface, sharp and angular particles; in the prior art In the evaluation method of the present invention, the particles are irregular in shape, and it is difficult to fully define and measure them. The existing methods are time-consuming, imprecise, not objective, and not uniform. [0003] There are mainly two types of evaluation methods in the prior art: [0004] 1) Gap rate method: This method is suitable for measuring the angulari...

AI Technical Summary

Problems solved by technology

[0005] Disadvantages: ① This test needs to measure the relative gross volume density of fine aggregates, which has been proved by engineering practice; it is unrealistic to measure the relative gross volume density of machine-made sand and stone chips, and the accuracy and uniqueness of the measurement results are poor

[0006] ②The correlation between the angularity of some aggregates and the performance of the mixture is not good

[0007] ③ The gradation of the test sample by this method is fixed, and the angularity of fine aggregates of different gradations cannot be distinguished

[0008] ④ The gross volume relative density of fine aggregates is more subjective and the results are inaccurate

[0010] Disadvantages: ① Poor execution, easy to cause misunderstandings and contradictions, cumbersome work procedures, difficult to master, not easy to promote

[0011] ②The measurement results are quite different, and the internal meridian of the funnel is not uniform for different grades

[0012] ③For general machine-made sand, it is difficult for the measurement results to meet the requirement of not less than 30S

The results of the two currently recommended methods are quite different, and the correlation of the results is poor

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