US 5,328,103 AGranted

Process for impact crushing of rock and ore lumps and an apparatus for performing same

OwnerEvarest B. Komarovskyinventor

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Abstract

A process for impact crushing of rock and ore lumps, in which a rock lump is subjected to a primary impact force P.sub.1, and then the plurality of resultant smaller pieces are subjected to a secondary impact force P.sub.2. The application of the impact forces P.sub.1 and P.sub.2 is synchronized in time. The velocity vector V.sub.1 of the lump subjected to the primary impact force P.sub.1 and the vector of the secondary impact force P.sub.2 lie on a line running through the center of the lump mass. The invention also covers an apparatus for performing the above process, which comprises a housing accommodating a primary crushing rotor and a secondary crushing rotor, and also means for synchronizing the rotation of the secondary crushing rotor and the primary crushing rotor, coupled kinematically to said rotors. The secondary crushing rotor has two hammers, and its mass increases along the longitudinal axis of symmetry in a direction away from the axis of rotation.

Claims12

Dependent claims

A process for crushing rock and ore lumps comprising the steps of:

a) guiding a rock lump to a first rotor or first set of rotors,
b) rotating the first rotor or first set of rotors so as to impart a primary impact force P.sub.1 to the lump whereby to break the lump into a plurality of resultant pieces and propel the resultant pieces to a second rotor or second set of rotors with a velocity having a magnitude and direction defined by a velocity vector V.sub.1 and with a momentum M.sub.1,
c) rotating the second rotor or second set of rotors so as to impart a secondary impact force P.sub.2 to the resultant pieces whereby to break the resultant pieces into smaller pieces and propel the smaller pieces with a velocity having a magnitude and direction defined by a velocity vector V.sub.2 and with a momentum M.sub.2,
d) aligning and synchronizing the rotation of the first and second rotors such that they cooperate to impart the primary impact force P.sub.1 to the lump and the secondary impact force P.sub.2 to the resultant pieces with the velocity vector V.sub.1 imparted to said resultant pieces by the primary impact force P.sub.1 and the velocity vector V.sub.2 of the secondary impact force P.sub.2 lying on a line passing through the center of mass of the resultant pieces and smaller pieces respectively and with the ratio of the momentum M.sub.2 of the smaller pieces to the momentum M.sub.1 of the resultant pieces lying within the range of about 0.3 to 70.0 with said momentum M.sub.1 having a minimum value of about 180 kgm/sec.

1 more element

An impact crusher for crushing rock and ore lumps comprising:

a housing having a bottom, a plurality of side walls and a cover, said cover forming a charging hole through which said rock and ore lumps can enter the housing, said bottom forming a discharging hole through which crushed rock and ore can pass from the housing;
primary crushing rotor means for crushing said rock and ore lumps, said primary crushing rotor means comprising a primary rotor fitted on a first shaft within the housing;
feed chute means for delivering said rock and ore lumps to said primary crushing rotor means, said feed chute means comprising at least one of said side walls;
secondary crushing rotor means for further crushing rock and ore lumps which have been crushed by said primary crushing rotor means, said secondary crushing rotor means comprising a secondary crushing rotor fitted on a second shaft within the housing, and having at least two hammers;
means for synchronizing rotation of the secondary crushing rotor and the primary crushing rotor, coupled kinematically with said primary and secondary crushing rotors, such that rock and ore lumps crushed by said primary crushing means can be further crushed by said secondary crushing means;
said secondary crushing rotor comprising an impact deflecting surface having a section profile and a rotation axis, the section profile of the impact deflecting surface having a variable curvature in a plane normal to the rotation axis, said secondary crushing rotor having a mass, a longitudinal axis of symmetry and a transverse axis of symmetry, the mass of said secondary crushing rotor increasing along the longitudinal axis of symmetry in a direction away from the axis of rotation so that the secondary crushing rotor has a moment of inertia along the longitudinal axis of symmetry which is more than five times the moment of inertia along the transverse axis of symmetry.

3 more elements

Dependencies are inferred from the claim text.