Impact crusher

An impact crusher for grinding and separating solid material, the crusher comprising:

• a base;
• a rotor on the base having an upright shaft defining an upright rotor axis about which the rotor is rotatable and a plurality of vertically spaced and radially horizontally outwardly extending rotor plates each having an outer periphery and each formed with a respective circular array of seats with inner edges of regular polygonal shape;
• a drum fixed on the base and spacedly surrounding the rotor;
• an array of axially extending and angularly spaced replaceable ribs on an inner surface of the drum;
• a plurality of adjusting disks each removably set in a respective one of the seats of the plates, each having a regular polygonal outer periphery complementary to that of the respective seat, and each centered on a respective disk axis parallel to the rotor axis, whereby each disk can fit in the respective seat in a plurality of angularly offset positions;
• an eccentric pivot pin on each of the disks radially offset from the respective disk axis and defining a respective hammer axis;
• and
• respective impact hammers angularly spaced around the outer periphery of each of the rotor plates, each hammer being pivoted on the pivot pin of a respective adjusting disk about the respective hammer axis such that angular displacement of any of the adjusting disks about the respective disk axis displaces the respective pivot pin, the respective hammer axis, and the respective hammers radially of the rotor axis and the drum.