Patent ID: 8561926

Claim:
A vertical shaft impact crusher for crushing material, said crusher comprising a rotor for accelerating a first flow of material to be crushed, a first feed means for feeding the first flow of material to the rotor, a housing comprising a circumferential impact wall section against which the accelerated first flow of material may be crushed, and a second feed means for feeding a second flow of material to be crushed into the path of the accelerated first flow of material, the second feed means comprising an inner hopper and an outer hopper, the inner hopper including at least one outlet for allowing said second flow of material to enter a space formed between said inner and outer hoppers, a slide plate adjacent to said at least one outlet is located in the space between said inner and outer hoppers, the slide plate is inclined in a direction being substantially tangential in relation to the rotor, such that material leaving said at least one outlet will slide on the slide plate and obtain a movement in a direction having a substantially tangential component in relation to the rotor, wherein an adjustment device is connected to the slide plate to adjust an angle between the slide plate and a horizontal plane; and wherein a direction arm is fixed between the inner and outer hoppers, the slide plate being mounted on the direction arm, and, when viewed in a direction perpendicular to the horizontal plane, a portion of the slide plate extends past an edge of the direction arm in the direction having the substantially tangential component in relation to the rotor.