Tytov O.O. Modernization of roll crusher to enhance the efficiency of hard mining rocks destruction

Details

Parent Category: Geo-Technical Mechanics, 2018

Category: Geo-Technical Mechanics, 2018, Issue 141

Geoteh. meh. 2018, 141, 176-183

https://doi.org/10.15407/geotm2018.141.176

Modernization of roll crusher to enhance  the efficiency of hard mining rocks destruction

¹Tytov O.O.

¹National Technical University «Dnipro Polytechnic»

UDC  621.926: 622.7

Language: Russian

Annotation.

The existing design models of roll crushers for mining rocks, having smooth, knurled and toothed rolls and, also, the rolls with periodic rectangular profile, are analyzed. It is shown, that the efficiency enhancing of hard mining rocks destruction can be reached by usage of such profiles of working surface, that don’t undergo to sufficient wear. It is reached by withdrawal from cylindrical surface of rolls to the set of alternating cone sites, allowing to reach the break of material lump. But, at the same time, the rolls don’t have such obviously expressed protuberances like teeth being undergone by enhanced wear. The rolls periodic wave profile of own development, allowing to replace partly the lumps destruction by compression with the destruction caused by shift and flexural loadings, is analyzed in the work. This leads to the decrease of energy consumption during disintegration and, also, to the less material excessive grinding. The estimation of the proposed design efficiency compared to the analogues is made. It is set, that the grab angle of material lumps between the ledge and the hollow of neighboring rolls depends on the coefficient of material friction with bandage and the taper angle of roll profile. The grab angle increases together with rise of both values. The comparison of forces during the flat lump crushing by smooth and wave rolls is fulfilled. The cases of the cuboid lump destruction by the compression and the flexural loadings are considered. The comparison of crushing forces for the case of monoaxial compression of lump along its shortest side, corresponding to the conditions of loading between smooth rolls, with the case of bend during three-point clamping of material lump along the longest side, being typical for the wave profile, is fulfilled. It is showed, that the mechanical force advantage for the rolls with periodic wave profile may be several tens of times more compared to the smooth rolls. The results can be used to enhance the efficiency of fine-grained hard materials treatment with usage of roll crushers.

Keywords:  roll crusher, mining rock, roll profile, energy efficiency, way of destruction.

References

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About the author

Tytov Oleksandr Oleksandrovych, Candidate of Technical Sciences (Rh.D), Associate Professor in Department of Mining Machines and Engineering, National Technical University «Dnipro Polytechnic», Dnipro, Ukraine, This email address is being protected from spambots. You need JavaScript enabled to view it. .

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