Solid material comminution or disintegration – Apparatus – Including means applying fluid to material
Patent
1986-06-05
1988-01-19
Rosenbaum, Mark
Solid material comminution or disintegration
Apparatus
Including means applying fluid to material
241 5, B02C 1906
Patent
active
047200499
DESCRIPTION:
BRIEF SUMMARY
The present invention is concerned with a device for feeding the material to be ground into a pressure chamber grinder provided with an equalizing tank, in which said equalizing tank there is substantially the same pressure as in the pre-grinding part of the grinder, with which said pre-grinding part the equalizing tank communicates via a screw conveyor. The device concerned is installed in the top portion of the equalizing tank.
As a feeder device for pressure chamber grinders, usually a so-called plug feeder is used, by means of which the material to be ground is fed into the equalizing tank as a gas-tight plug, as is described, e.g., in the International Patent Application No. PCT/FI84/00021. The ejector feeder devices, which are commonly used in conventional jet grinder devices, are not at all suitable for being used in pressure chamber grinders, owing to the very high operating pressures in the latter. On the contrary, a plug feeder is excellently suitable for this purpose in the case that the properties of the material to be ground are such that the material can be compressed into a gas-tight plug. There are, however, also many such materials as would be otherwise well suitable for grinding in a pressure chamber grinder but as cannot be compressed into a gas-tight plug. Such materials are, e.g., granular materials and kernels of grain.
The object of the present invention is also to permit the grinding of materials of this type in a pressure chamber grinder, in view of the good energy economy and excellent grinding properties of the said grinder. This can be accomplished by means of a device in accordance with the invention, which is characterized in that the device comprises a substantially vertical, conical feeder chamber, whose volume is, at the maximum, about one quarter of the volume of the equalizing tank and at whose top end there is a feed opening and, at the bottom end, an exhaust opening layer than the feed opening; valve members arranged in said openings and having diameters corresponding to the said openings, the said valve members being provided with elastic closing members, operating in the way of an annular muscle for closing and opening the said openings; a gas feed pipe passing into the top portion of the feeder chamber and provided with a valve, for the generation of a pressure impact in the top end of the feeder chamber, and a gas-removing pipe provided with a valve, for lowering the pressure prevailing in the feeder chamber.
An object of the invention is to provide an improved feeding device for feeding granular material to be ground into a pressure chamber grinder equalizing tank which includes a feeder having a feeder chamber with one end connected to the equalizing tank and the exhaust opening adjacent this one end and having an exhaust valve for opening and closing the exhaust opening and in which the feeder chamber has an opposite end with a feed opening having a valve in the feed opening with each of the valves having an elastic closing member defining an annular muscle for closing and opening the valves and with a gas feed line extending into the top of the feeding chamber having a gas feed control valve for controlling the gas pressure impact of gas flowing into the feed chamber and a gas removing line connected into the feed chamber with a gas outlet valve lowering the pressure in the feed chamber.
A further object of the invention is to provide a feeding device which is simple in design, rugged in construction and economical to manufacture.
The various features of novelty which characterize the invention are pointed out with particularity in the claims annexed to and forming a part of this disclosure. For a better understanding of the invention, its operating advantages and specific objects attained by its uses, reference is made to the accompanying drawing and descriptive matter in which a preferred embodiment of the invention is illustrated.
BRIEF DESCRIPTION OF THE DRAWINGS
The only FIGURE of the drawings is a schematic elevational view of a feeding device for feedi
REFERENCES:
patent: 1099557 (1914-06-01), Lorenz et al.
patent: 4333613 (1982-06-01), Haikkala
patent: 4422579 (1983-12-01), Niemi
Oy Finnpulva AB
Rosenbaum Mark
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