Patent ID: 8646712

Claim:
A gyratory crusher comprising: a crusher head on which a first crushing shell is mounted; a frame on which a second crushing shell is mounted, the second crushing shell forming in conjunction with the first crushing shell a crushing aperture; a drive device adapted to rotate an eccentric to which the crusher head is so connected as to be caused, during rotation of the eccentric, to perform a gyratory movement for crushing of material which is introduced into the crushing aperture; and a dust seal adapted to seal a gap between a portion of the frame surrounding the eccentric and a fastening portion located on the crusher head or located on a crusher main shaft axially below the crusher head, wherein the dust seal comprises a seal bellows and a seal slide ring which is connected sealingly to a lower portion of the seal bellows and which has a lower slide surface adapted to slide along, and to sealingly abut, with a substantially vertical abutment pressure determined by the inherent weight of the seal slide ring and by the influence of the seal bellows, against an upper slide surface provided on the portion of the frame surrounding the eccentric, with an upper portion of the seal bellows sealingly connected to the fastening portion, so that rotation of the crusher head causes rotation of the seal slide ring about a substantially vertical axis of rotation.