Working principle of compound crusher (http://www.cdfnt.com): the material falls vertically into the high-speed rotating impeller from the top of the machine. Under the action of high-speed centrifugal force, it collides and crushes with another part of the material which is separated in an umbrella shape around the impeller. After the material collides with each other, it will form a vortex between the impeller and the body to collide and rub with each other many times, and then discharged directly from the bottom, forming a closed circuit for many times circulation. The screening equipment controls the process to achieve the required product size.