Crushing device and method for crushing raw materials

A method for crushing a coarse-grained material, comprising:

• feeding the coarse-grained material into a crushing device that includes a first axially rotatable grinding means and a funnel-shaped second grinding means which is fixed with respect to the first axially rotatable grinding means, the second grinding means accommodates the first axially rotatable grinding means and is in operative connection with the first axially rotatable grinding means for the purpose of crushing the coarse-grained material, the first axially rotatable grinding means has an outer lateral surface and a hollow space at least partially surrounded by the outer lateral surface, the outer lateral surface having a shape of a circular cone, the outer lateral surface faces an inner lateral surface of the second grinding means, the outer lateral surface and the inner lateral surface each comprise teeth,
• wherein when the material enters the crushing device, the material is accelerated radially and delivered to an area between the outer lateral surface and the inner lateral surface via at least one transport channel of the first axially rotatable grinding means, the at least one transport channel has at least one first section extending axially and at least two second sections which adjoin the at least one first section at an angle and penetrate the outer lateral surface of the first axially rotatable grinding means such that the outer lateral surface is divided into multiple partial surfaces, which are separated from each other by the at least two second sections and which at least partially surround the hollow space, wherein the at least one first section forms a part of the hollow space of the first axially rotatable grinding means, and
• crushing the material within the area between the outer lateral surface and the inner lateral surface using the teeth of the outer lateral surface and the inner lateral surface;
• wherein the circular cone shape of the first axially rotatable grinding means is defined by a cone axis, a cone apex, and a cone base;
• wherein each second section extends along part of a generatrix of the circular cone shape from the cone apex towards a base surface;
• wherein the at least one first section extends axially along the cone axis
• wherein each second section extends along a partial length of a total length of the generatrix from the cone apex towards the base surface, wherein a ratio of the partial length to the total length is equal to a ratio of a depth of the at least one first section to a distance between an intersection point of the base surface with the cone axis and the cone apex.

A crushing device comprising at least two parts for crushing coarse-grained materials, including

• a first axially rotatable grinding means with an outer lateral surface having a shape of a circular cone;
• a funnel-shaped second grinding means which is fixed with respect to the first axially rotatable grinding means, the second grinding means accommodates the first axially rotatable grinding means and is in operative connection with the first axially rotatable grinding means for the purpose of crushing the coarse-grained material;
• wherein the outer lateral surface faces an inner lateral surface of the second grinding means, the outer lateral surface and the inner lateral surface each comprise teeth;
• wherein the first axially rotatable grinding means has at least one transport channel for the respective material to be crushed;
• wherein the at least one transport channel has at least one first section extending axially and at least one second section which adjoins the at least one first section at an angle and extends along part of the outer lateral surface of the first axially rotatable grinding means;
• wherein the circular cone shape of the first axially rotatable grinding means is defined by a cone axis, a cone apex, and a cone base;
• wherein the at least one second section extends along part of a generatrix of the circular cone shape from the cone apex towards a base surface;
• wherein the at least one first section extends axially along the cone axis;
• wherein the at least one second section extends along a partial length of a total length of the generatrix from the cone apex towards the base surface, wherein a ratio of the partial length to the total length is equal to a ratio of a depth of the at least one first section to a distance between an intersection point of the base surface with the cone axis and the cone apex;
• and
• wherein the at least one first section has a depth corresponding to between 50% and 95% of a distance between an intersection point of the base surface with the cone axis and the cone apex.