Patent ID: 9259739
Filing Date: 2016-02-16
CPC Classification: B02C

Claim Text:
1. A vertical-type mill comprising: a milling mechanism which has a milling roller or a milling ball, and a milling table rotatably disposed in a position facing the milling roller or the milling ball, and which mills a material to be milled and obtains solid particles by meshing of the milling table with the milling roller or the milling ball; a classification mechanism which is disposed above the milling mechanism and which has a classifier for classifying the milled solid particles, and a hopper for collecting coarse particles classified by the classifier and dropped downward, and guiding the coarse particles to the milling mechanism; a raw material feeding pipe through which the material to be milled can be inputted onto the milling table and which is provided so that a bottom end of the raw material feeding pipe can be located inside the hopper; and a housing which receives the milling mechanism and the classification mechanism; wherein: the hopper is a funnel-like structure having a hollow inverted conical part whose diameter is reduced as it goes from a top end thereof toward a bottom end thereof, and a cylindrical part which extends downward from the bottom end of the inverted conical part; and the raw material feeding pipe is provided in the hopper to satisfy the relation 0.15≦L′/L≦0.5, where, using a boundary line between the inverted conical part and the cylindrical part of the hopper as a reference position, L is a distance from the reference position to the top end of the hopper, and L′ is a distance from the reference position to the bottom end of the raw material feeding pipe.