ENERGY-EFFICIENT SINGLE-ROLL CRUSHER DESIGNED FOR THE PREPARATION OF RAW MATERIALS FOR METALLURGICAL PROCESSING

In the metallurgical industry, approximately 40 % of the energy spent on preparing raw materials for further processing is accounted for by crushing processes that are carried out on crushing machines. These processes are necessary to obtain pieces of raw materials of the required fraction for metallurgical processes. One of the main indicators of the crushing process is the crushing efficiency, which is determined by the mass of crushed material obtained by consuming a unit of electricity. Obviously, reducing energy consumption during crushing is an urgent problem, the solution of which increases the energy efficiency of the crushers. The minimum energy consumption required to destroy a brittle material will be if only tangential stresses are generated in the crushed piece. The tensile strength under their action is two times less than when normal stresses occur in a piece, all other things being equal (the same size and material). In order to reduce the energy consumption required for the destruction of brittle material, it is necessary to ensure the generation of exclusively tangential stresses in the crushed piece. A single-roll crusher has been designed at the Siberian State Industrial University, the design of the working bodies of which is capable of generating shear deformations in the initial destructible piece, in which only tangential stresses occur. This is due to the fact that during the operation of the crusher, the destruction of the processed material occurs due to forces acting on the crushed piece in the same plane towards each other. The conducted force analysis of the operation of a single-roll crusher operating on a shear showed that the condition for creating a flat stress state in the destroyed piece is fulfilled (only tangential stresses occur). Due to this, the energy consumption for crushing is reduced by about two times compared to jaw crushers that operate on compression.

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