There are many classification methods of crushing equipment, either according to the structure, or according to the crushing method, or according to the movement speed, or according to the type of force, or according to the degree of refinement. The attached table of crushing machinery categories and main features lists the crushing machinery categories and main features. The crushing ratio and crushing system crushing ratio refer to the degree of change in the size of the material particle size before and after crushing. For a single crushing machine, it is equal to the ratio of the larger (or average) particle size of the feed to the larger (or average) particle size of the discharge; for a crushing system composed of multiple crushing machines, it is equal to The ratio of the initial feeding size to the discharge size is or equal to the continuous product of the crushing ratio of each single crushing machine. When using a crushing machine to crush materials, the crushing ratio is usually called the crushing ratio. When the crushing ratio is very large, the crushing operation is often completed in a crushing system composed of several crushing machines. In this system, the material passes through various crushing machines, and its particle size is gradually reduced to reach the required particle size. In this kind of crushing system, appropriate crushing machinery and crushing ratio should be selected for each stage, and the production capacity of each stage should be maintained in coordination with each other. At the same time, in order to reduce excessive crushing to improve crushing efficiency and reduce energy consumption, it is necessary to screen or classify after each crushing operation. According to the degree of subdivision, the crushing equipment can be divided into rubber and plastic crushing equipment, turbine crushing equipment, jet crushing equipment, screenless vertical crushing equipment, ultrafine classifier crushing equipment and other special supporting machinery, crushing equipment, etc. .