Milling process and roller mill
OwnerMartin H. Gygiinventor
Life of this patent
Estimating the term…
Abstract
An improved milling process, wherein the material to be crushed is processed within a circular milling path under the action of at least one roller rolling along said path. The material is fed evenly distributed around the circumference of the milling path and enters it with a predetermined initial speed transversely to the extension of the path such that each piece to be crushed is subjected at least once to the action of one of the rollers. Under the action of an air current which is guided across the milling path pulverized material below a given grain size is immediately removed from the milling path, thereby avoiding the build-up of a thick and energy consuming layer on the milling path such that the milling forces are limited to the breaking forces for crushing the pieces fed into the milling path.
Claims10
In a roller mill having at least one milling stage, said milling stage comprising a circular milling path, a plurality of rollers supported to roll along and upon said circular milling path, a feeding device for feeding the material to be crushed into said mill, a distribution device for evenly distributing said material along the circumference of said milling path and for continuously introducing it into the milling path substantially in a direction parallel to the axis of the rollers and an air current generation means, the improvement comprising air guiding wall means facing said milling path and extending parallel thereto to form an air gap in between for guiding said air current transversely over said milling path, said wall means comprising openings through which said rollers project into said gap and said milling path being arranged to release said material after its having been subjected to the action of a roller.
A multiple stage roller mill having a plurality of milling stages and a feeding device for feeding the material to be crushed at least into a first of said milling stages, each milling stage comprising a circular milling path, a plurality of rollers supported to roll along said circular milling path, a distribution device for evenly distributing said material to be crushed coming from the feeding device or from a preceding milling stage along the circumference of said milling path and for introducing it into the milling path of said milling stage in a direction transverse to its circular extension, said roller mill further comprising an air generation means for generating an air current across the milling paths of all milling stages, said milling stages having air guiding wall means facing the respective milling path and extending parallel thereto to form an air gap in between for guiding said air current transversely over said milling path, each milling path further being arranged to release the material after its having been subjected to the action of the respective rollers to the distribution device of the next milling stage or to an outlet.
Dependencies are inferred from the claim text.