The material enters the crushing cavity of the heavy hammer crusher from the feeder. The material is crushed in three stages. The first stage is where the material collides with the upper impact plate for primary crushing. The second stage is between the high-speed rotating hammer head and the adjacent lining plate of the rotor. During the extrusion and impact, part of the material moves up with the high-speed running rotor and is crushed again by the new incoming material. The other part of the material enters the three-stage crushing and collides with the corrugated liner of the discharge port. The material that reaches the crushing size will be discharged. Those that do not meet specifications will continue to shatter.