Solid material comminution or disintegration – Processes – Miscellaneous
Reexamination Certificate
1999-06-18
2001-04-03
Rosenbaum, Mark (Department: 3725)
Solid material comminution or disintegration
Processes
Miscellaneous
C241S084300, C241S199100
Reexamination Certificate
active
06209809
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to grinding barrels for use in pulverizers and to methods of grinding material.
2. Description of the Related Art
For the purpose of assaying core samples obtained by drilling, the core samples are normally firstly broken into pieces and these pieces are then pulverized in a pulverizer.
More particularly, the pulverizer is provided with a grinding barrel comprising an upwardly open, dish-shaped grinding barrel body provided with a circular lid for closing the top of the grinding barrel body and a grinding disk located in the interior of the grinding barrel body. The grinding disk has a peripheral diameter which is less than the internal diameter of the grinding barrel body.
In use, the broken pieces or core material are placed in the interior of the grinding barrel body, together with the grinding disk, and the lid is then fitted onto the grinding barrel body. The assembly of the lid, the grinding barrel body and the grinding barrel disk are then installed in the pulverizer, which rotates the assembly with a circular motion, thus causing the grinding disk to slide around within the grinding barrel body, and the bottom of the grinding barrel, so that the material to be pulverized is crushed and pulverized between the grinding disk and the internal surface of the grinding barrel body.
In conventional grinding barrels, the grinding barrel body has a flat circular bottom surface, and the grinding disk has a flat circular undersurface which slides across the top surface of the bottom of the grinding barrel body. Consequently, the material is pulverized mainly between the peripheral surface of the grinding disk and the annular wall of the grinding barrel body.
SUMMARY OF THE INVENTION
According to the present invention, there is provided a grinding barrel which has a grinding barrel body formed with an annular peripheral wall and a bottom wall, the annular peripheral wall defining an open top, and grinding barrel lid for closing the open top. The grinding barrel body contains a grinding disk, and an undersurface of the grinding disk, and an upper surface of a bottom of the grinding barrel body, are formed with mutually interengaged recessed and protruding portions.
Preferably, the grinding disk and the grinding barrel body are dimensioned so that the disk is displaceable across the upper surface to the peripheral wall of the grinding barrel body at any side of the grinding barrel, and so that the recessed and protruding surface portions are then brought together at an opposite side of the grinding barrel. Consequently, the material is ground between the disk and the barrel both at the periphery of the disk and an internal surface of the peripheral wall and, also, between the recessed and surface portions of the disk and the bottom wall of the grinding barrel body.
In a preferred embodiment of the present invention, the recessed and protruding surface portions comprise a central convexly curved protruding portion of the upper surface of the bottom wall of the grinding barrel body and a central, concavely curved recessed portion of the undersurface of the grinding disk.
Also according to the present invention, a method of grinding material in a grinding barrel between a grinding barrel body and a grinding disk within the grinding barrel comprises oscillating the grinding barrel body to displace the grinding disk across the grinding barrel body and thereby grinding the material simultaneously between a peripheral portion of the grinding disk and the grinding barrel body and also between a recess in a central portion of the underside of the grinding disk and a raised central portion of a bottom wall of the grinding barrel body protruding loosely into the recess.
REFERENCES:
patent: 4640468 (1987-02-01), Quinn
patent: 5556044 (1996-09-01), Hobson
patent: 173072 (1986-03-01), None
Milde Hoffberg & Macklin, LLP
Rosenbaum Mark
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