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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.

To make the crusher smooth, the speed fluctuation small and motor load evenly, on the both ends of the eccentric shaft are set with wheels.

Jaw crusher is widely used in mining, smelting, building materials, highway, railway, water conservancy and chemical industries for crushing various materials whose compressive strength less than 320 MPa.

Mining crusher is also called rock crusher for mining use, which refers to the crushing machine whose discharging granularity is more than 3 mm account for more than 50% in total discharge capacity in layout. Crushing work includes rough crushing, middle crushing as well as fine crushing according to the size of the feeding and granularity. The sandstone equipments that the commonly utilized are jaw crusher, strike crusher, compound crusher, vertical crusher, spiral crusher, double roll crusher, etc.