Abstract: An impact crushing machine provided with easily repairable strikers fixedly arranged along the circumference of a rotor at regular angular intervals so as to extend radially of the rotor. A plurality of seats fixedly mounted respectively with striking chips formed of a durable hard material such as a hard metal are arranged in lines and rows on and detachably fixed to the radially outer end of the striker for individual replacement. When the striking chip is abraded to an unusable extent, the seat mounted with the worn striking chip and a seat fixedly mounted with an unworn striking chip can be interchanged for the further use of the striker, so that the frequency of replacing the heavy striker with a new one is reduced and the operating cost of the impact crushing machine is reduced.

Abstract: A carbide tip is provided at a charge stock discharge opening of a rotor in a crushing apparatus. The dimension of the carbide tip in the inner circumferential direction of the rotor is set to 1/2 or more of a maximum particle size of the charge stock. Furthermore, another dimension of the carbide tip is set to 1/2-2 times the maximum particle size of the charge stock. A groove is formed at or near a bonded portion between the carbide tip and a base material of an end blade, so as to avoid stress concentration at the bonded portion.