Solid material comminution or disintegration – Apparatus – Including means applying fluid to material
Reexamination Certificate
1999-08-26
2001-02-27
Rosenbaum, Mark (Department: 3725)
Solid material comminution or disintegration
Apparatus
Including means applying fluid to material
C241S228000
Reexamination Certificate
active
06193177
ABSTRACT:
TECHNICAL FIELD
The present invention relates to grinders constituted by a drum having a horizontal axis, inside which is provided a circular grinding track and comprising means for driving the drum in rotation at a speed above the critical speed in such a way that the material in the process of being ground is maintained on the track by centrifugal force, a roller placed inside the drum so as to be able to travel over the track and pressed against the latter, and a device for displacing the material from one edge of the track to the other constituted by a knife or blade placed inside the drum, in its upper descending portion, so as to detach the layer of material from the track, and by at least one deflecting plate disposed beneath the knife so as to intercept the material detached by the latter and to deflect it towards the grinder output.
BACKGROUND ART
A grinder of this type is disclosed in French patent No. 91 09788. In this grinder, the active plane of the knife forms an angle of approximately −45° with the radial plane containing the edge of the knife, and the layer of material is, in certain cases, detached from the track in the form of agglomerates. This has drawbacks, particularly when it is desired to dry the material with a hot gas.
The object of the present invention is to ensure the breaking up of the layer of material by the knife and its dispersal, which makes it possible to improve heat exchanges, when the material has to be dried using hot gases, and, if applicable, to facilitate grain size selection, thus permitting selective forward feeding of the material. Another object of the invention is to reduce the wear of the knife and of the deflecting blade.
SUMMARY OF THE INVENTION
The material forward feed device of the present invention is characterised in that the active plane of the knife forms an angle of between −50° and +15° with the radial plane resting upon its edge.
Blowing nozzles supplied with gas under pressure and pointed towards the track are associated with the knife to complete its action. Because of these nozzles it will be possible to avoid contact between the edge of the knife and the track or the layer of material adhering thereto and, consequently, to reduce its wear. Furthermore, the nozzles will enhance the dispersal of the material.
The deflecting plate can be constituted by a flat caisson or box, the upper face of which will be permeable to air and which will be supplied with air or with another gas under pressure. By reducing the friction of the material on the plate, this arrangement will enable its wear to be reduced. Furthermore, the gas jets emitted through the upper face of the plate can be orientated appropriately to effect selective forward feed of the material, as a function of its grain size.
REFERENCES:
patent: 1603639 (1926-10-01), Reed
patent: 2745748 (1956-05-01), McCashen
patent: 3596841 (1971-08-01), Perry
patent: 5205494 (1993-04-01), Durinck et al.
patent: 548555 (1932-04-01), None
patent: 471647 (1914-11-01), None
patent: 2679792 (1993-02-01), None
Chevalier Philippe
Cordonnier Alain
Lagache Philippe
Obry Christophe
FCB Societe Anonyme
Harrison & Egbert
Rosenbaum Mark
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