Roller mill and method for manufacturing roller mill

A roller mill comprising:

• a rotary table that rotates about a drive shaft by a driving force from a drive unit;
• a fuel supply unit that supplies solid fuel to the rotary table;
• and
• a roller that rotates about a rotating shaft by being pressed against a grinding surface of the rotary table and grinds the solid fuel along with rotation of the rotary table;
• a first position where an outer peripheral surface of the roller and the grinding surface of the rotary table come into contact with each other and a circumferential velocity of the outer peripheral surface equals a circumferential velocity of the grinding surface being located further to an inner circumferential side of the rotary table than a second position where the outer peripheral surface and the grinding surface come into contact with each other at a center position in a width direction of the roller;
• a radius of curvature of the outer peripheral surface of the roller being constant;
• a first radius of curvature of the grinding surface at a third position corresponding to an end surface of the roller on the inner circumferential side of the rotary table being less than a second radius of curvature of the grinding surface at a fourth position corresponding to an end surface of the roller on an outer circumferential side of the rotary table;
• and
• a distance in the rotating shaft direction from the first position to the third position being within 0.3 times a width of the roller.

A method for manufacturing a roller mill including a rotary table that rotates about a drive shaft by a driving force from a drive unit;

• a fuel supply unit that supplies solid fuel to the rotary table;
• and a roller that rotates about a rotating shaft by being pressed against a grinding surface of the rotary table, grinds the solid fuel along with rotation of the rotary table, and has an outer peripheral surface with a constant radius of curvature;
• the method comprising:
• a rotary table installing step of installing the rotary table;
• a roller installing step of installing the roller so that a first position where the outer peripheral surface of the roller and the grinding surface of the rotary table come into contact with each other and a circumferential velocity of the outer peripheral surface equals a circumferential velocity of the grinding surface is located further to an inner circumferential side of the rotary table than a fourth position where the outer peripheral surface and the grinding surface come into contact with each other at a center position in a width direction of the roller;
• and
• a rotary table forming step of forming the rotary table so that a first radius of curvature of the grinding surface at a third position corresponding to an end surface of the roller on the inner circumferential side of the rotary table is less than a second radius of curvature of the grinding surface at a fourth position corresponding to an end surface of the roller on an outer circumferential side of the rotary table, and a distance in the rotating shaft direction from the first position to the third position is within 0.3 times a width of the roller.