Solid material comminution or disintegration – Apparatus – Cooperating comminuting surfaces
Patent
1997-05-30
1998-09-22
Husar, John M.
Solid material comminution or disintegration
Apparatus
Cooperating comminuting surfaces
241209, 241212, B02C 204, B02C 206
Patent
active
058102698
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
This invention relates to an improved gyratory crusher and, in particular, to a gyratory crusher having an improved mounting by which a crushing head of the crusher is supported for drive in gyratory movement within a bowl.
BACKGROUND OF THE INVENTION
In a gyratory crusher of the type to which the present invention relates, the head is required to gyrate on a gyratory axis which is inclined with respect to, and intersects a central axis of the bowl, at an angle which is substantially fixed in use of the crusher. The nature of the gyratory motion varies with the location of the point of intersection between the gyratory and central axes. At least in a preferred form of the crusher of the present invention, the point of intersection is located proximate to, or co-incident with, a plane extending across the lower end of the head, as with the gyratory crusher disclosed in Australian patent specification 618545 (AU-B-19935/88), corresponding to WO 89/00455. Indeed, the present invention, in such preferred forms, provides improvements in the crusher of specification 618545 and, for ease of description, the present invention is described in the context of arrangements having the point of intersection of the gyratory and central axes which is proximate to or co-incident with such plane. However, it is to be understood that the improvements of the present invention have application in gyratory crushers in which that point of intersection is at other locations. That is, the point of intersection can be spaced from, either above or below, rather than proximate to a plane extending across the lower end of the crushing head.
In the gyratory crusher of Australian patent specification 618545, the crushing head has a lower support which comprises a hemispherical bearing or knuckle. An upper support and drive take the form of an upper shaft which has an axis which is co-incident with the central axis of the bowl of the crusher and a lower eccentrically inclined shaft which has an axis co-incident with the gyratory axis for the head. The upper shaft is confined in a vertical aspect by bearings located in a rigid upper frame of the crusher, while the crushing head is mounted concentrically on the lower shaft by bearings therebetween. Drive to the upper shaft causes gyratory motion of the head due to eccentric engagement between a lower face of the upper shaft and an upper face of the lower shaft.
The hemispherical knuckle of the crusher of specification 618545 is located in a socket in a lower frame of the crusher, with its convex, upwardly-facing hemispherical bearing surface have a centre of curvative co-incident with the central axis of the bowl. At the lower end of both the lower shaft and the crushing head, there is a housing defining a concave, hemispherical seating which fits accurately and closely over the knuckle. The arrangement necessitates that the axis of the lower shaft, and hence the gyratory axis of the head, intersects the central axis of the bowl at the centre of curvature of the knuckle bearing surface.
In use, it is found that there can be problems with the crusher disclosed in specification 618545. Trouble-free operation necessitates a high level of dimensional accuracy in the manufacture of all components, and a high level of skill both in initial assembly of the components by the manufacturer and in re-assembly after servicing by operators. This is because: necessitating bearings for the upper shaft being concentric with the central axis; necessitating bearings for the lower shaft being concentric with the gyratory axis; curvature for the bearing surface of the knuckle; and knuckle must be in appropriate sliding contact without overloading of any of the bearings. re-establishing them after at least partial disassembly for service also requires a high level of expertise. Also, it is necessary that the conditions be retained during use, which can present further difficulties.
When friable and frangible material is crushed in an upper region of a crushing chamber between the bow
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Husar John M.
Wescone Crushers Pty. Ltd.
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