Apparatus for fracturing and method for producing fractured fragments
An apparatus for fracturing in which: a fracturing tooth is formed so that a base-end portion has a larger diameter than that of a top-end portion, and a tapered part is formed at the base-end portion so as to expand from the top toward the base; a fixing cover is formed along a longitudinal direction of rolls; in the fixing cover, fixing holes for fracturing teeth are formed along the longitudinal direction so that the fracturing tooth is inserted therein; each of the fixing holes has a slope in which the tapered part is in contact at a surface; a fracturing teeth unit is fixed to the roll in a state in which the top-end portion of the fracturing tooth is protruded from the fixing hole radially-outwardly of the roll and the tapered part is wedged between the slope of the fixing hole and the roll.
1. An apparatus for fracturing comprising:
a pair of rolls which are rotated in a counter direction each other around parallel axes; and
a plurality of fracturing teeth units which are provided on outer peripheral surfaces of the rolls, which are arranged along a circumferential direction of the rolls, and which have a plurality of fracturing teeth protruding radially-outwardly and fixing covers fixing the fracturing teeth on the outer peripheral surfaces of the rolls, wherein
each of the fracturing teeth is formed so that a base-end portion has a larger diameter than that of a top-end portion, and a tapered part is formed at the base-end portion so as to expand along a direction from the top-end portion toward the base-end portion,
each of the fixing covers is formed long along a longitudinal direction of the rolls,
in each of the fixing covers, plurality of fixing holes for fracturing teeth are formed so as to be arranged along the longitudinal direction and penetrate each of the fixing covers along a thickness direction, so that the fracturing tooth is inserted in each of the fixing holes,
each of the fixing holes for fracturing teeth has a slope in which the tapered part of the fracturing tooth is in contact at a surface,
the fracturing teeth unit is fixed to the roll in a state in which the top-end portion of the fracturing tooth is protruded from the fixing hole for fracturing tooth radially-outwardly of the roll and the tapered part of the fracturing tooth is wedged between the slope of each of the fixing covers and the roll, and
the apparatus fractures fracturing objects between the rolls.
2. The apparatus for fracturing according to claim 1 , wherein a conical column part is further formed by extending the tapered part between the top-end portion and the base-end portion of the fracturing tooth.
3. The apparatus for fracturing according to claim 1 , wherein an inclined angle of the tapered part is set in a range of not less than 10° and not more than 25° with respect to a normal line at the outer peripheral surface of the roll.
4. The apparatus for fracturing according to claim 1 , wherein:
both ends of each of the fixing covers of the fracturing teeth unit are fixed to the roll by screws; and
a flat part is formed on the outer peripheral surface of the roll in which back surfaces of the both ends of each of the fixing covers are in contact with.
5. A method for producing fractured fragments by using the apparatus for fracturing according to claim 1 .