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The product of crushing materials is around 1mm~5mm, so it is needed to depend on external force to crush big blocks of materials into smaller ones. Its main aim is to provide raw materials whose granularity fits for technology demands for following working procedures as well as be convenient for storing and transportation. In the process of industry, it is all adopted crushers for crushing. Crushing is very important in industries such as beneficiation, coal dressing, metallurgy, construction, road building, cement, alumina, nonmetallic metal processing and coal fired plant and so on. In beneficiation and cement plant, the investment and producing cost of crushing workshop takes a huge amount. So that it is significant to low crushing energy consumption ratio and improve crushing efficiency.


Crushing is a complicated material's size changing process, related to a lot of elements. The mainly factors are as follows: materials resistance, hardness, toughness, size, humidity, temperature, density, homogeneity as well as external factors such as mutual works of materials' block and distribution and so on. The above elements make crushing process complicated so that it has not reached a unified and complete theory explaining and instructing crushing practices. Crushing only takes place when extra forces instead of cohesion among particles take work. The same materials have totally different cohesion which can be divided into two kinds: one is the force of each particle inside crystal; the other is force between crystals. Both of them have the same physical property while different value, with the former one has bigger force than the latter one. The size of cohesion is decided by property and structure of materials' own crystal. It is also related to structure's default which may be macro and micro traumatic crack making connection between crystals smaller. The cohesion inside crystal can be calculated in theory according to crystal's structure and property of particles' mutual force. It is still out of grasp the precise value of cohesion inside crystals as well as affection induced by lowing materials' toughness.


Materials block firstly has elastic deformation before crushing by external forces. When it deforms to a certain value, it re-closes at cracking position and hardens as well as adds more stress. Deformation continues with the increasing of external forces work till it cracks along the most fragile face. It can be known that materials crack by vertical stress or slides under the function of shearing force or crack under both forces by observing the cracking faces.


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