The impact crusher is an efficient crushing device. Ore from the feed port to, and slid down the sieve, sieve ore i.e. hard alloy hammer on the rotor rotates at high speed in the crushing down process and a very high speed tangential to put an The first counterattack plate causes the ore to continue to be broken, and the counterattack hits the ore back and collides with other ore that is pulled out behind the rotor, so that the ore is crushed by repeated impacts in the first crushing chamber. Some ore is crushed to a certain particle size in the first crushing chamber, and is discharged into the second crushing chamber through the gap between the counterattack plate and the rotor, and continues to be repeatedly struck until the particle size becomes small, and then discharged from the bottom discharge port of the crusher. .