Bozhyk D. Improving the technology for crushing rocks by impact in the field of centrifugal forces

The thesis is devoted to solving an important scientific and technical problem: the substantiation of the construction parameters and operating modes of centrifugal disintegrators for the production of high-quality crushed stone with a cuboid shape of factions. There were analyzed the situation with production of building materials from natural building stone and its use in various spheres of the national economy. It was described that the traditional equipment that are used for the production of building materials - jaw, cone, roll crushers - does not allow to obtain high-quality crushed stone with a high content of cubic forms of more than 90%. It has been proposed to use centrifugal impact crushers (disintegrators) with an adjustable drive for the production of high-quality crushed stone, which allows to choose the optimal modes for each type of material and for each crushed particle size class. Theoretical foundations and mathematical models of the process of destruction of material by a free impact in the field of centrifugal forces, which reflect the physical essence of the processes in the disintegrator working chamber, have been developed. It has been recommended to apply theoretical developments to calculate and substantiate the parameters and optimal operating modes of the disintegrator. Experimental research in semi-industrial conditions found that to obtain crushed stone with a content of cubic grains of 90-95%, the following high-speed works of the disintegrator are necessary: fraction -20 + 10 mm. - 70-80 m / s, fraction -50 + 20 mm. - 45-50 m / s. It has been proven that the use of centrifugal disintegrators for the production of crushed stone allows to obtain high-quality crushed stone with a content of cubic factions of 90-95%, which is 10-15% more than in cone-type crushers. A new technology has been developed for the production of high-quality crushed stone with an application of the centrifugal disintegrators in the final stage of crushing. The technology and design of a centrifugal impact crusher have been developed and implemented with the principle of destruction of solid material by hitting the field of centrifugal forces. The technology is recommended for use at enterprises that produce high-quality crushed stone with a high content of cubic forms.