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| Experimental study on the crushing characteristics of material particles in vertical shaft impact crusher |
| Received:October 26, 2023 Revised:November 03, 2023 |
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| DOI：doi：10.3969/j.issn.1671-9492.2024.08.006 |
| KeyWord:Vertical shaft impact crusher; Impact crushing test; Active impact; Specific impact energy; Crushing characteristics |
| Author | Institution |
| LI Song |
School of Mechanical Engineering,Guizhou University |
| ZHAO Limei |
School of Mechanical Engineering,Guizhou University |
| WU Canhui |
School of Mechanical Engineering,Guizhou University |
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| Abstract: |
| The crushing process of material particles in a vertical shaft impact crusher is extremely complex. In order to better quantify the crushing behavior of material particles and thus reveal the crushing mechanism of the crusher, an an-alytical method for the crushing characteristics of material particles based on the active impact experiment is pro-posed. Firstly, the active impact crushing experimental setup powered by compressed gas is designed and constructed with regard to the problem of the difference between the passive impact experiment mode mostly used at present and the crushing mode of material particles in the crusher. Secondly, in order to investigate the impact crushing char-acteristics of material particles in the case of active impact, with the t10-Ecs model as the evaluation index for impact crushing characteristics, the impact crushing model of material particles based on the specific impact energy is established on the theoretical basis of fracture mechanics. Then, with the limestone particles as the research object, the single impact crushing experiments on four kinds of material particles with different grain sizes under different impact speeds are carried out by using the active impact crushing experimental setup constructed independently. Finally, the effects of specific impact energy and initial sizes of particles on particle crushing characteristics are explored in depth by sieve analysis of material particle crushing products. The results of the study show that the crushing degree index t10 increases in a negative exponential manner with the increase of the specific impact energy Ecs. The fitting results of the crushing characteristic parameter A × b showed that the impact crushing resistance of limestone particles is at the "medium-hard" level, which is suitable for the production of mechanism sand. The overall friability of limestone particles decreased with the initial particle size increasing, and the content of particles of each size in the material particle crushing products of increases with the specific impact energy increasing. The specific impact energy and the initial size of particles show an interaction on the crushing degree of limestone par-ticles, and the effect of the initial size of the particles on the degree of crushing decreases with the decrease of the specific impact energy. |
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