Solid material comminution or disintegration – Apparatus – Loose grinding body comminutor
Patent
1993-11-02
1995-07-11
Husar, John
Solid material comminution or disintegration
Apparatus
Loose grinding body comminutor
241299, 241DIG30, B02C 1722
Patent
active
054313511
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to a wear element in the form of a so-called lifter bar to be mounted on the inside of a rotating drum, in particular a mill for grinding ore and minerals, in order to protect, as a portion of the lining, the drum against wear during its rotation, said wear element consisting of a foot portion, for fixing the wear element in the drum, and an upper portion joined to the foot portion and arranged to extend into the drum.
A mill for grinding ore and minerals is always provided on the inside of the drum with a lining to protect the drum against wear during the milling work which is carried out by pebbles, the ore itselves or milling bodies of metal, such as balls, rods and cylpebs. Such a lining can be made in many ways, but often consists of plates and lifter bars of a wear-resistent material, for example steel or rubber. The lifter bars extend normally in the longitudinal direction of the mill and essentially radially on the heads of the drum and are most often fixed in the drum between the wear plates which are thus clamped in place. A lining consisting of lifter bars and plates has the advantage over smoother designs, that the lifter bars lift the mill charge which thus exerts less slippage and abrasion against the drum walls during the rotation of the drum. By virtue of the fact that the lifter bars are Substantially higher than the plates, these are protected by the lifter bars, which are subjected, primarily from above, to most of the wear. This means that if the wear on the top of the lifter bars can be reduced, the wear on the plates will also be reduced automatically. Lifter bars of wear-resistent rubber are often reinforced or capped with a steel top or steel profile on the side facing the direction of rotation to extend the life of the lifter bar and the lining as a whole.
The purpose of the present invention is to suggest a new type of lifter bar design, which makes it possible in mills such as pebble mills and ball mills, to extend the life of the lifter bars and thus possibly extend the intervals between liner replacements.
In order to solve this task, the wear element of the type described by way of introduction, is broadly characterized in that the upper portion has a carcass of metal, preferably of wear-resistent steel or white cast iron, comprising an elongated forward wall element facing in the direction of rotation of the wear element, an elongated rear wall element and between these wall elements transverse wall elements, the wall elements of the carcass defining between them a plurality of spaces which are at least partially filled with a filler of another material than one of the components of the mill charge, and of greater abrasive specific volume loss than the metal of the carcass.
The cell-like structure of the metal carcass is used primarily to achieve a partly continuous self-protecting effect of the lifter bar. The filler in the spaces of the metal carcass is selected so that it is worn by volume more rapidly than the metal carcass. Cavities are thus gradually dug out at the tops of the lifter bars limited in size by the wall elements of the metal carcass. Components from the mill charge which are wedged between the wall elements in the dug-out cavities or lie loosely therein protect, during the milling process, the upper edges of the metal carcass of the lifter bar which are most subjected to wear by periodically extending thereabove. This increases the life of the lifter bar. Continuity in the self-protecting process is assured by the fact that the depths of the dug-out holes are limited by the relatively short distances between the wall elements.
Since it is advantageous to retain the original height of the lifter bar as long as possible, one can use the metal carcass of the lifter bar and the filler lying in its spaces to support and hold one or more wear bodies of harder material than the metal carcass, the filler next to the wear body essentially serving as a binding agent. In this case, it is assumed that the carcass is made in the hardest pos
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