Abstract: A vertical shaft impact crusher has an vertically adjustable feed tube disposed within a throat between a feed hopper of the crusher and the crusher lid of the housing. The feed tube may be adjusted in predetermined discrete increments to within a predetermined distance above an impeller table of the crusher within the housing of the crusher and without removing the hopper of the crusher during such adjustment. The adjustment is achieved by rotating an adjustment ring disposed at an interface between a hopper portion and a lid portion of the throat between the hopper and the lid. The adjustment ring may be held between to adjacent throat flanges to rotate circumferentially about a vertical crusher axis. The feed tube is a two-piece tube which includes an upper, re-usable portion and a lower expendable portion. The feed tube is held within a carrier tube which includes circumferentially spaced adjustment steps.

Abstract: A rotor for a vertical shaft impact crusher features a unique protector for the trailing edge of each material exit portal of the crusher. The portal protector includes upper and lower "wings" between which is a channel. The wings and channel trail outwardly from the portal and along the periphery of the rotor to create a pair of trailing vortices which confine the exiting material to the periphery of the rotor in order to prevent the material from also spilling over the upper and lower edges of the portal and onto the top of the rotor, thus reducing wear. The peripheral wall of the rotor is protected by symmetrical shell segments having upper and lower lips. Each of the latter is engaged in turn by a symmetrical, segmented rim liner fashioned so that a shell segment can be replaced or moved to even-out wear simply by removing one of its associated segmented rim liners.