Solid material comminution or disintegration – Apparatus – Loose grinding body comminutor
Patent
1995-09-14
1997-12-16
Rosenbaum, Mark
Solid material comminution or disintegration
Apparatus
Loose grinding body comminutor
241172, B02C 1718
Patent
active
056975643
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
FIELD OF THE INVENTION
The invention relates to an assembly for separating milling elements from a worked suspension comprising several parts being movable with respect to each other and slots being formed between the parts.
Suspensions are milled or disperged by means of ball mills. The milling is performed by stirring a suspension being mixed with grinding balls. The suspension may be continuously pumped in and out. At the outlet the suspension is separated from the grinding balls, which have to remain in the mill, by a special device, which is called ball mill separator.
Assemblies according to the introductary clause are known e.g., from German Patent Nos. 2,446,341 C3 and 2,631,623 C2. The assembly according to German Patent No. 2,446,341 C3 comprises several annular rings, which are alternating fixed and movable. The movable rings are altogether mechanically connected to a vibrator. The distance between the rings is such that the grinding balls cannot pass. The vibrational movement eliminates the danger of clogging of the slits between the rings.
German Patent No. 2,631,623 C2 discloses a grinding ball separator consisting of a staple of narrowly spaced annular disks. The disks all have a common axis. Every second disk is rotatable in order to avoid clogging of the spaces. The disks may be connected to the stirring shaft or to a separate driving shaft. The rotation may be made automatically or manually.
A general and widespread problem of prior art grinding ball separators is the wear. Ball fragments that are smaller than the gaps between the rings can enter into the gaps and wear down the edges and surfaces. The damaged surfaces lead to lighter gaps and entry of larger fragments resulting in a further damage. At sometime the assembly has to be exchanged by a new one. Replacing the grinding ball separator means halting the process for a certain time altogether.
BROAD DESCRIPTION
SUMMARY OF THE INVENTION
It is the object of the invention to provide an assembly for separating milling elements from a worked suspension, minimal wear, having a compact structure and being quickly replacable.
The problem is solved by an assembly as mentioned above, which is characterized in that neighbouring parts engage each other, thereby being able to perform a limited relative movement in such a way that a first part continuously being moved within its total range of movement, the other parts successively following in a chain reaction-like delayed, discontinuous movement.
A feature of the invention is that the movement of neighbouring parts is limited (e.g., to a rotation of 90.degree. ) such that the wear that mainly goes back to the effect of milling fragments between moving parts, is strongly reduced. In order to achieve the anti-clogging effect, a discontinuous, short movement with long inactive intervals is sufficient.
According to a preferred embodiment, the movable parts comprise interleaving nested rings arranged concentrically. The rings are annular and preferably in the same geometric plane. This leads to a very compact structure. It is possible to build small scale separators as well as large scale separators. The more rings there are, the more slots are formed and the higher is the amount of suspension passing per time unit. The annular rings are loosely connected. The assembly can therefore easily be decomposed after the innermost or outermost part has been removed. Intermediate parts can therefore easily be replaced. It is a further advantage of the invention that the separator can work even though one or more slots are clogged and the respective neighbouring parts are not any more movable relative to each other. Since the total range of movement of the first part is the sum of all relative movements, it is possible to detect if any two parts are wedged, without the assembly having to be removed and decomposed.
There are preferably engagement elements of the rings extending in a radial outward or inward direction and being freely movable to and fro between limiting ele
REFERENCES:
patent: 842076 (1907-01-01), Burnett
patent: 1753685 (1930-04-01), Bodenstein
patent: 2095228 (1937-10-01), Burns
patent: 2189312 (1940-02-01), Frisch
patent: 3086586 (1963-04-01), Wolfe
patent: 3904133 (1975-09-01), Bicik et al.
Lonza S.P.A.
Rosenbaum Mark
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