Pulverizer
A pulverizer simplified in structure for easy maintenance and suppressed in cost. The pulverizer has a hopper ( 2 ) provided on one side thereof, a product discharge hole ( 4 ) provided on the other side thereof, and a raw material crushing chamber ( 3 ) for crushing raw material that is fed from the hopper ( 2 ) and discharging the crushed material from the product discharge hole ( 4 ) . The pulverizer further has at least one thin plate-like rotor ( 8 ) disposed on the upstream side inside the raw material crushing chamber ( 3 ), a hollow circular cylindrical space (S 1 ) in which the rotor is placed, a classifying space (C) disposed on the downstream side of the hollow circular cylindrical space (S 1 ) and formed in a hollow circular cylindrical shape having an inner diameter smaller than the hollow cylindrical space (S 1 ), and a product discharge hole ( 4 ) which is coaxially disposed on the downstream side of the classifying space (C) having an inner diameter smaller than the classifying space (C). Airflow produced by the rotation of the rotor ( 8 ) causes raw materials to collide with each other to crush them or causes raw materials to collide with the inner wall surface of the raw material crushing chamber to crush them.
1. A pulverizing apparatus comprising:
a raw material supply port provided in one end side;
a product discharge port provided in the other side;
a raw material pulverizing chamber for pulverizing a raw material supplied from the raw material supply port so as to discharge from the product discharge port;
a rotor arranged in an upstream side within the raw material pulverizing chamber and formed by at least one thin plate;
a cylindrical space in which the rotor is accommodated;
a classifying space arranged in a downstream side of the cylindrical space and having a cylindrical shape with an inner diameter set smaller than the cylindrical space; and
the product discharge port arranged in a downstream side of the classifying space,
wherein the pulverizing apparatus pulverizes by causing the raw materials to collide against each other, or causing the raw material to collide against an inner wall surface of the raw material pulverizing chamber, by a gas flow generated by a rotation of the rotor.
2. The pulverizing apparatus according to claim 1 , wherein the rotor is structured such that a plurality of rotors are arranged side by side along a direction of a rotating axis, and regulates a grain size of a product by structuring an arrangement interval of the rotors adjustable.
3. The pulverizing apparatus according to claim 1 , wherein the classifying space has at least two classifying space portions having different inner diameters, and is set such that the inner diameter becomes smaller toward a downstream side.
4. The pulverizing apparatus according to claim 1 , wherein the classifying space is adjacent to the cylindrical space and is provided with a taper space portion in which the inner diameter becomes gradually smaller as being far from the cylindrical space.
5. The pulverizing apparatus according to claim 1 , further comprising:
a bypass path arranged in an outer portion of the classifying space and bypassing a leading end side of the classifying space from an upstream side of the classifying space; and
an internal path arranged in an inner portion of the classifying space and connected from the leading end side of the classifying space to the upstream side of the classifying space,
wherein the pulverizing apparatus is structured such as to return a coarse grain discharged to the bypass path side, in the pulverized raw material, again into the classifying space via the internal path.
6. The pulverizing apparatus according to claim 5 , wherein a plurality of connecting portions for connecting the bypass path are provided in an outer portion of the classifying space, and are selectable in correspondence to a grade of the raw material.