The VSI crusher applies the principles of selective crushing and cleavage crushing, directly applying sufficient kinetic energy to the material, and converting the kinetic energy into the crushing energy required to overcome the material through impact for crushing. The material fractures along its natural texture and cleavage planes, with good particle shape and low self consumption. It realizes the conversion between the two working principles of "stone hitting stone" and "stone hitting iron". The material vertically falls into the high-speed rotating impeller from the upper part of the machine, and under the action of high-speed centrifugal force, it collides and crushes at high speed with another part of the material that is divided in an umbrella shape around the impeller. After the materials collide with each other, they will form vortices between the impeller and the casing, collide and rub against each other multiple times, and be crushed. They are directly discharged from the lower discharge hopper, forming a closed loop and multiple cycles, and controlled by the screening equipment to achieve the required particle size of the finished product.