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Crusher is a quite common machine used in mineral industry mainly to crush all kinds of stone materials and the particle size of products is different according to the different crushing theories. The layout whose particle size is longer than 3mm exceeds 50% in the total layout. Of course there are many types of crushers, such as cone crusher and impact crusher, however, we are not gonging to give more detailed statements of those but spend more time on the rush issue of crushers--blocking up.

With the improvement of extractive and the increased block size of extractive material, single rotor impact crusher limites the increase of feeding particle size due to its own structure, thus double rotor had been created out. In order to increase the role of the second rotor, double rotor impact crusher with height difference came after. Going back to the energy-linear formula, we can see that the first rotor crushes the materials in a lower speed while the second one go with a higher speed, as a result, reduction ratio has improved.