Solid material comminution or disintegration – Apparatus – Cooperating comminuting surfaces
Patent
1999-11-02
2000-10-31
Rosenbaum, Mark
Solid material comminution or disintegration
Apparatus
Cooperating comminuting surfaces
241228, B02C 1320
Patent
active
061389331
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to grinders comprising an annular track with a horizontal axis, a roller capable of travelling over the said track, means for pressing the roller against the track and means for displacing the material from one edge of the track to the other, in such a way that it can pass several times beneath the roller before being evacuated.
BACKGROUND ART
To enhance grinding when the materials to be ground are of heterogeneous grain sizes, it is proposed (French patent No. 91.09788) to give the roller and/or the track a profile such that the gap between the roller and the track decreases progressively or by degrees from one edge of the track to the other.
The object of the present invention is to enhance the efficiency of the grinders of this type and to achieve a better distribution of the mechanical stresses in the roller and the track.
SUMMARY OF THE INVENTION
The grinder to which the present invention relates is characterized in that the gap between the roller and the track decreases from the edge of the track located on the side for feeding the material to be ground to a distance from the said edge at least equal to 80% of the width of the track, and then increases more quickly to form an area of decompression on the ground material evacuation side.
According to a preferred form of embodiment, the track is constituted by a ring integral with a drum having a horizontal axis which forms a supply chamber on one side of the track and an evacuation chamber on the other side, and an annular barrier is provided at the end of the evacuation chamber opposite that adjoining the track to maintain in the said chamber a layer of ground material the thickness of which is such that it practically reaches the edge of the roller in the plane of the adjacent edge of the track.
Preferably, the axial extent of the decompression area counting from the edge of the track located on the material evacuation side, is between 2% and 20%, preferably 5% and 15%, of the width of the track, and, in this area, the angle formed by the track and the peripheral surface of the roller, in the plane containing the axes of the track and the roller, is less than 50.degree..
According to one form of embodiment of the grinder, the track is cylindrical and the roller is formed by at least two frustoconical parts, a first part the diameter of which increases from its end located on the supply side to a distance from this end at least equal to 80% of the axial length of the roller, and a second part of decreasing diameter located at its other end.
Alternatively, the track can have a frustoconical profile with a diameter that decreases from its edge located on the side for supplying the material to be ground to the decompression area and a constant or variable angle at the apex; in the decompression area, the diameter of the track increases in the direction of progress of the material. With such a track, use can be made of a cylindrical roller the axis of which will be parallel with axis of the track or will form an angle of less than 5.degree. therewith.
BRIEF DESCRIPTION OF THE DRAWINGS
The description that follows refers to the accompanying drawings which show, by way of non-limitative examples, several forms of embodiment of the invention, and in which:
FIG. 1 is a vertical section of a grinder produced according to the invention;
FIG. 2 is a section, through a plane perpendicular to the axis of the grinder of FIG. 1; and
FIGS. 3 and 4 illustrate two other forms of embodiment of the invention.
The grinder shown in the drawings is constituted by a drum 10, with a horizontal axis, which is supported by shoes or skids 12 enabling it to rotate about its axis ; these shoes could be replaced by a bushing or rollers. The drum is driven in rotation by conventional means, not shown, for example by a motor and a reducer the output shaft of which bears a pinion engaged with a toothed wheel fixed to the drum.
The drum is constituted by a shell internally lined with wear plates which, in the central portion, for
Chevalier Philippe
Cordonnier Alain
Lagache Philippe
Obry Christophe
FCB
Rosenbaum Mark
LandOfFree
Crushers with ring-shaped track and roller does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Crushers with ring-shaped track and roller, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Crushers with ring-shaped track and roller will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2042544