The common classification device of fluidized bed jet mill is the horizontal classification wheel. 
The function of the classifying wheel is to classify the fine particles in the crushing chamber to form crushed products,
 while the coarse particles are brought back to the crushing chamber by the centrifugal force generated by the 
classifying wheel to continue crushing, which not only ensures the fineness of the product, 
but also separates the fine particles in time to avoid Over shattered. The greater the speed of the grading wheel,
 the finer the graded product. The grading wheel directly controls the particle size of the product, 
so it is an important factor affecting the particle size of the product. However, when the feed rate is too high,
 the grading wheel will be overloaded, resulting in a reduction in the speed of the grading wheel, 
and large particles will enter the product.