Crushers, grinding mills, and pulverizers are types of grinding equipment used to transform or reduce a coarse material such as stone, coal, or slag into a smaller, finer material. Grinding equipment can be classified into two basic types, crushers, and grinders. Industrial crushers are the first level of size reducer; further granularization occurs in grinding mills or pulverizers.
Material is reduced by crushers and grinders by fracturing, which takes place when the material is put under stress by the moving parts of the crushing or grinding equipment. Forces applied during the process may be compressive, shear or impact. The material fractures when the internal strain levels reach a critical level. Energy is released when the material fractures, primarily as heat. Several theories for the science of size reduction have been developed, the energy required in size reduction is proportional to the new surface created by the particle fragmentation. The equation can be written as:
E = KRfc(1/L2– 1/L1)
Where: E=Energy, KR=Rittinger’s Constant, fc=crushing strength of the material, L1=initial length, and L2=reduced length.
the energy is proportional to the size reduction ratio. The equation for Kick’s Law can be written as:
E = KKfc loge(L1/L2)
Where: E=Energy, KK=Kick’s Constant, fc=crushing strength of the material, L1=initial length, and L2=reduced length.
that the total work input represented by a given weight of the crushed product is inversely proportional to the square root of the diameter of the product particles. Bond’s Law can be written as:
E = Ei (100/L2)1/2[1 - (1/q1/2)]
Where: E=Energy, L1= initial length, L2=reduced length, Ei is defined as the amount of energy required to reduce a material’s unit mass from infinitely large particle size to a size of 100 μm and L is measured in microns and q is the reduction ration L1/L2.
are one of the newer technologies in the crushing industry.
They feature two rotors, each fixed with large teeth that rotate in opposite directions at low speeds. The material to be crushed is fed onto the rotors and is gripped and then crushed between the teeth. When sufficiently reduced, the crushed material falls between the rotors and exits from the bottom of the crusher. Tooth roller crusher is suitable for coal, metallurgy, mining, chemical industry, building materials, and other industries of equipment, tooth roller crusher is more suitable for crushing large coal or coal preparation plant raw coal (including gangue). The toothed roller crusher mainly adopts the special wear-resisting toothed roller to split and crush the material at high speed (the traditional toothed roller crusher adopts low-speed extrusion and crushing), forming the mechanism of high productivity. The mineral sizers is composed of transmission device, frame part, crushing roller, mechanical spring device, linkage mechanism, etc.Above we introduced the mineral sizers
and you may learn a lot about the mineral sizers
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