Rolling press, in particular for material bed comminution

Details Rolling press, in particular for material bed comminution Rolling press, in particular for material bed comminution

B - Operations, Transporting

02

C

B02C 4/28 (2006.01) B30B 15/30 (2006.01)

Patent

CA 2653065

In order to provide a roller press which is used in particular for interparticle crushing and in the material feed shaft (12) of which both coarse-grained material (14), such as fresh material for example, and fine-grained material (19), such as, for example, recirculated grits of a downstream classifier and/or, for example, fly ash, are introduced, wherein, despite the markedly different grain size and grain distribution in the two material flows to be drawn into the roller gap, the stability of the particle bed or grinding bed and thus a high grinding efficiency are ensured, it is proposed according to the invention that a pressure screw (17) conveying the fine material under applied pressure be inserted into the material feed shaft (12) through the at least one fine-grain charging opening (16) of the latter, the nozzle-like orifice (20) of which pressure screw (17), in particular a flat nozzle, extends right into the central region in which the material is drawn into the pressing roller gap.

L'invention concerne en particulier une presse à rouleaux utilisée pour le broyage d'un lit de matière comportant un conduit de distribution de matière (12) dans lequel est introduite une matière à grains grossiers (14) comme par exemple un produit frais ainsi qu'une matière à grains fins (19), comme par exemple de la semoule recirculée d'un tamis monté en aval et/ou par exemple des cendres volantes, où, malgré la taille des grains et la granulométrie clairement différentes, la stabilité du lit de matière ou du lit de broyage et donc un grand rendement de broyage est garantie dans les deux flux de matière à introduire dans l'interstice entre les rouleaux, caractérisée en ce que l'on introduit à travers la ou les ouvertures pour le chargement de grains fins (16) dans le conduit de distribution de matière (12) une vis sans fin de pression (17) refoulant la matière fine par la pression appliquée, sa sortie (20) de type buse, notamment de type buse plate, s'étendant jusque dans la partie centrale de l'entrée de matière de l'interstice entre les rouleaux de pressage.

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