Grinding machinery plays an important role in the field of mining machinery. Crushing machine comprising mining mechanical crushing and milling machines. Mine crushing machinery is a machine that uses mechanical force to crush solid materials into small pieces, fine powder or powder.
The pulverizing operation using the pulverizing machine is characterized by high energy consumption, a large amount of wear-resistant materials and grinding media, severe dust and high noise.
The remarkable features of the pulverizing operation using the pulverizing technology are: high energy consumption, large amount of wear-resistant materials and grinding media, severe dust and high noise.
The pulverization technique can be used to reduce the particle size of the material to a certain size; increase the surface area of ​​the material to increase the effect of its physical action or the speed of the chemical reaction; and separate the different components in the material after pulverization to further separate each other Separate and so on.
The comminution technique is selected based on the physical characteristics of the material, the size of the block, and the degree of refinement required. For hard materials, extrusion, bending and splitting should be used; for brittle materials, impact and splitting should be used; when the block is large, splitting and bending should be used; if the block is small or the grain size of the discharge is very small, Impact and grinding should be used. If the pulverization technology is not properly selected, there will be difficulty in smashing or excessive smashing, both of which will increase the energy consumption during the pulverization process.
There are many sorting techniques for crushing machines, either in the form of structures or in crushing techniques, or in terms of speed of movement, or by type of force, or by degree of refinement.
The pulverization ratio refers to the degree of change in the size of the material before and after pulverization. For a single pulverizing machine, it is equal to the ratio of the maximum particle size of the feedstock to the maximum particle size of the discharge; for a pulverizing system consisting of multiple pulverizing machines, it is equal to the initial feed size and final discharge size. The ratio is equal to or equal to the product of the pulverization ratio of each single pulverizing machine. When a crushing machine is used to crush a material, the pulverization ratio is generally referred to as a crushing ratio.
When the pulverization ratio is required to be large, the pulverization operation is often performed in a pulverizing system composed of a plurality of pulverizing machines. The material passes through each of the pulverizing machines in this system, and its particle size is gradually reduced, and finally the desired particle size is achieved. In this comminution system, appropriate comminution machinery and comminution ratio should be used at each stage to maintain a mutually productive production capacity between stages. At the same time, in order to reduce excessive pulverization to improve pulverization efficiency and reduce energy consumption, it is necessary to perform sieving or grading after each pulverizing operation.
A large amount of pulverizing work in industrial and agricultural production consumes a lot of energy, but in the pulverizing operation, most of the energy input into the pulverizing machine is converted into heat and absorbed by the pulverizing machine, the circulating air, and the pulverized material. The amount directly used for material pulverization is extremely small: in a crushing machine, generally not more than 10%; in a grinding machine, it is often less than 1%. Therefore, in order to reduce energy consumption, it is necessary to select an appropriate pulverizing machine, adopt the correct operation method, specify the optimum pulverization ratio, and the output per unit time.
Taking a general cement factory as an example, the power consumption of the crushing machine accounts for about 10% of the total power consumption, while the power consumption of the grinding machine accounts for about 60%. Therefore, measures to reduce excessive pulverization must be taken during the pulverization process to achieve energy saving.
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