Patent ID: 8777143

Claim:
An anti-spin system for the head of a cone crusher of the type which comprises a structure ( 10 ), in which are mounted an upper housing ( 20 ) and a vertical axle ( 30 ) having a free upper end ( 31 ); an eccentric element ( 40 ) mounted around the vertical axle ( 30 ), to be rotated by a drive mechanism ( 50 ); and a cone head ( 60 ), disposed in the interior of the upper housing ( 20 ) and being axially and rotatively supported on the structure ( 10 ) above the free upper end ( 31 ) of the vertical axle ( 30 ) and radially and rotatively supported around the eccentric element ( 40 ), wherein said cone head ( 60 ) has a mass center, said anti-spin system further comprising a braking bush ( 70 ), carried by one of the parts defined by the cone head ( 60 ) and by the structure ( 10 ) and an annular shoe ( 80 ) carried by the other of said parts, the braking bush ( 70 ) and the annular shoe ( 80 ) being pressed against each other, by action of the inertial centrifugal force (T) acting on the mass center of the cone head ( 60 ) upon “no-load” operation of the crusher, so as to generate a braking friction force (R 1 ) opposite to a dragging friction force (R 2 ) generated between the cone head ( 60 ) and the eccentric element ( 40 ); characterized in that said braking bush ( 70 ) and annular shoe ( 80 lie an axial distance (A) from the mass center of the cone head ( 60 ) smaller than an axial distance (B) between said mass center and the region in which acts the dragging friction force (R 2 ) in the minimum eccentricity region of the eccentric element ( 40 ), said braking friction force (R 2 ) being superior to the dragging friction force (R 2 ) preventing the cone head ( 60 ) from being rotationally dragged by the eccentric element ( 40 ).