Solid material comminution or disintegration – Apparatus – Cooperating comminuting surfaces
Patent
1986-10-27
1989-02-28
Eley, Timothy V.
Solid material comminution or disintegration
Apparatus
Cooperating comminuting surfaces
241117, 241257R, B02L 712
Patent
active
048078182
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
This invention relates to a mill for grinding granular material, for example grain and to a method of grinding granular material.
Conventional grain mills utilise rollers to crush the grain. This requires a relatively heavy construction and a high consumption of power to drive the rollers, and such mills are not readily scaled down for small-scale use. An object of the invention is to provide a mill which can be used in a wide range of sizes, and which is not costly in power to operate.
According to the present invention there is provided a mill for grinding granular materials comprising a grinding surface,
a generally conical grinding member,
a mounting for the grinding member arranged to permit the grinding member to be rolled around the grinding surface.
The present invention also provides a method of grinding granular material in which the granular material to be ground is introduced between a conical grinding member and a grinding surface and in which the material in being ground is subjected to both a crushing and a shearing action.
Although the grinding surface may be fixed, it is preferable to mount the surface for rotation about an axis upon which lies the vertex of the grinding member, the surface being rotated at such a speed relative to the movement of the grinding member that the desired degree of shear between the grinding member and the surface is achieved. The grinding surface and the grinding member are preferably driven by a single motor, via a common drive shaft, the speed of the grinding surface relative to the shaft being variable, for example by a drive belt and opposed tapering or stepped pulleys.
The grinding member may include a passage therethrough opening at at least one aperture through the wall of the member adjacent to the vertex, whereby granular material may be fed down through the interior of the grinding member.
It has been found that a mill in accordance with the invention grinds grain efficiently with a low requirement of effort in moving the grinding member, thus rendering the mill suitable for manual operation.
BRIEF DESCRIPTION OF THE DRAWINGS
Reference is made to the drawings, in which:
FIG. 1 is a schematic sectional view through a mill therethrough in accordance with one embodiment of the invention to illustrate the principle of operation;
FIG. 2 is a perspective view of the mill shown in FIG. 1;
FIG. 3 is a top plan view of the mill shown in FIGS. 1 and 2; and
FIG. 4 is an elevation of a practical mill according to another embodiment of the invention.
DESCRIPTION OF THE PREFERRED EMBODIMENT
The operating principle of the mill will now be described with reference to FIGS. 1, 2 and 3 which illustrate the theory of operation.
The mill comprises a conical vessel 1 mounted with the vertex of the cone downwardly, and a conical grinding member 2, having a smaller angle opening than the conical vessel 1 is mounted so as to be able to be rolled around the inner surface of the vessel 1 whilst maintaining contact as shown between the vessel walls and the conical grinding member 2. The grinding member 2 is carried by a shaft 3 which may suitably be freely mounted at its upper end in an eccentric rotatable relative to a support. Driving force for the grinding member may be provided manually via a handle, peddle or treadle but for many applications a motor drive will be used.
The axis of the conical vessel 1 may be fixed or may be rotated either in the same direction as the member 2 or the opposite direction. This rotation assists in the movement of the granular material 6 towards the rim 5 and spreads the material 6 over a larger grinding surface.
The grinding member 2 is hollow and preferably has a number of outlets 4 adjacent to the vertex so that granular material 6 such as grain may be fed down through the grinding member, passing through the outlets 4 into the conical vessel 1 for grinding.
The combination of crushing and shearing experienced by the granular material during rotation or oscillation of the grinding member has been found to be e
REFERENCES:
patent: 4067503 (1978-01-01), Broman
Eley Timothy V.
National Research Development Corporation
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