Ring-roller crusher

Details Ring-roller crusher Ring-roller crusher

1999-11-02

2001-05-08

Rosenbaum, Mark (Department: 3725)

Solid material comminution or disintegration

Apparatus

Cooperating comminuting surfaces

Reexamination Certificate

active

06227470

ABSTRACT:

TECHNICAL FIELD
The invention relates to grinders constituted by a ring with a horizontal axis, driven in rotation about its axis by appropriate means, and at least one roller, the axis of which is parallel to that of the ring and which is placed inside the latter so as to be able to travel over its internal surface, which forms a grinding track, and including elastic means, such as springs or hydro-pneumatic jacks, for pressing the roller against the ring, with grinding being effected by crushing the material between the roller and the ring.
The invention relates more particularly to grinders of this type in which the roller is supported at its ends by two arms mounted on the frame of the grinder so as to be able to pivot about one and the same axis parallel to the axis of the ring, with the elastic pressure means acting upon the arms.
BACKGROUND ART
In these grinders, when the material to be ground is not uniformly distributed over the entire width of the grinding track, particularly when large pieces are introduced onto the track, the roller tends to position itself slantwise in relation to the ring, which reduces its efficiency. To overcome this drawback, the two arms could be attached rigidly to one another, but this would lead, in the event of a large piece or of a nongrindable object passing between the ring and the roller, to the grinding force exerted by the roller being concentrated on a reduced area of the ring, with the occurrence of excessive mechanical stresses in the roller and the ring.
The object of the present invention is to provide simple means for limiting the slantwise positioning of the roller in relation to the ring while, at the same time, limiting the grinding pressures and, consequently, the mechanical stresses, to within acceptable values, as well as for contributing to a reduction in the oscillatory movements of the roller and its supports.
SUMMARY OF THE INVENTION
According to the invention, the two arms are connected to one another by a torsion shaft parallel to the axis of rotation of the arms. This shaft can be disposed in the axis of rotation of the arms, or outside this axis, on the same side as the roller in relation to the axis, or on the other side.


REFERENCES:
patent: 5060874 (1991-10-01), Sidney
patent: 5192030 (1993-03-01), Jakobs
patent: 2246720 (1992-02-01), None

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