[Problem] To resolve segregation of grinding media to thereby enable a large-flow-rate circulation operation while reducing wear of an agitating member and a grinding media separating member. [Solution] In a media-agitation type pulverizer, the agitating means comprises: a circular plate-shaped hub member (26) fixed to an end of a rotary drive shaft located inside a grinding chamber, wherein the rotary drive shaft extends front the side of one end of the grinding chamber into the grinding chamber; an annular end plate (28) disposed in spaced-apart relation to the hub member in an axial direction of the rotary drive shaft; a plurality of agitating members (30) fixed between the hub member and the end plate at circumferential intervals, in a posture where each of them protrudes radially outwardly from respective outer peripheries of the hub member and the end plate; and a plurality of grinding media scraping-out members (31) each extending radially inwardly with respect to the outer peripheries of the hub member and the end plate, wherein an open region as a part of an outer periphery of the agitating means other than thicknesses of the agitating members and the grinding media scraping-out members is formed as a grinding media circulation opening (22a) for circulating the grinding media from an inside to an outside of the agitating means, and wherein an area ratio of the grinding media circulation opening to a circumferential plane between opposing surfaces of the hub member and the end plate of the agitating means is set to 50 to 90%.

An agitator mill having a circular-cylindrical outer stator and an agitator having a circular-cylindrical rotor. The rotor is arranged within the outer stator, and a milling chamber between the rotor and the outer stator. In the milling chamber, a through-flow direction which extends from a feed channel to a discharge channel. Several rotor milling tools are attached to the rotor, wherein several outer-stator milling tools are attached to the outer stator. The outer-stator milling tools are arranged adjacent to and in the circumferential direction and form rows. These rows are arranged parallel to one another on the outer stator. On the side, facing away from the feed channel the outer-stator milling tools of at least one row have a greater radial length than the other outer-stator milling tools. The outer-stator milling tools of each row in the circumferential direction each have the same length.

A device that effectively produce matcha powder is provided and includes: a stirred media mill grinding portion, having a grinding chamber inside, wherein a side of the stirred media mill grinding portion defines an outlet port; a pin bar, rotatably received in the grinding chamber, wherein an outer circumference of the pin bar defines an opening, communicated with the grinding chamber; an air classifier, connected to the outlet port through a first tube assembly and defining a first output port and a second output port; a storage portion, connected to the first output port; a collector portion, connected to the second output port through a second tube assembly; and a wind guider, wherein an air outlet of the wind guider is connected to the outlet port and an interior of the storage portion to create a negative pressure environment.

The invention relates to a method of predicting a level of wear of a wear component of a vertical mill, whereby the vertical mill is used for grinding feed material. The method includes, while the mill is in operation, (i) capturing/obtaining a thermal profile of the mill from outside a grinding chamber of the mill, and (ii) determining an indication as to a level of wear of at least one wear component of the mill which is located inside the grinding chamber, based on the thermal profile of the mill. The step of capturing/obtaining a thermal profile may include performing a thermographic analysis of the mill from outside the grinding chamber of the mill. The determining step may include determining whether the wear component requires changing/replacement based on the thermographic analysis of the mill.

A vertical and horizontal mills and discs therefor for grinding particles to submicron size. The mills include two overlapping vertical barrels. Each barrel has a shaft and a plurality of circular discs attached to the shaft disposed in each barrel for grinding materials to submicron size. The discs have an open mesh design provided by overlapping rectangular blades. Each blade has at least two opposing walls orthogonal to a plane defined by the disc. Each disc on one shaft overlaps a disc on the other shaft by from 30 to 45% of the diameter of the discs. An inlet is provided for feeding material to be ground by the mill to the overlapped portion of the discs. An outlet is disposed at an end of the mill opposite the inlet for removing ground material from the mill.

An attrition mill that includes a grinding chamber having a plurality of grinding elements and an internal classification and separation stage. The mill also includes at least one grinding element providing a larger flow path therethrough, when compared to other of the grinding elements. In other embodiments, mill includes at least one grinding element having an open area in the grinding element created to allow a larger flow path as a proportion of the grinding element surface area without such allowance and in the range of from 15% to equal to or less than 100%.

The present invention provides a grinding and shaping method using a vertical grinding mill. The grinding and shaping method comprises selecting a vertical grinding mill with thread pitch/diameter ratio of a spiral rotor; selecting the grade of a grinding medium and determining a filling factor and adding the grinding medium into a grinding chamber of the vertical grinding mill; sequentially initiating a dust collector, an air blowing device, a driving device and a feeding device; adjusting rotation speed of the spiral rotor; feeding a raw material into the feeding port at an upper end of the grinding chamber; initiating a discharging device, and discharging the raw material from a discharging port; wherein when selecting the vertical grinding mill, the thread pitch/diameter ratio of the spiral rotor is determined according to the Mohs hardness of the raw material.

An agitator shaft (1) for a grinding mill, including: an axle (2) intended to be driven in rotation, a succession of flat agitator elements (3) and tubular spacers (4) mounted in alternation on the axle and in a stack along the axle (2), end stops (5, 6), secured to the axle, that keep the stack of agitator elements and spacers under compression, characterized in that the tubular spacers (4) have orifices allowing the free circulation of material and fluids from the outside of the agitator shaft to the inside, and vice versa.

A steam stripping apparatus is provided that prevents adherence of crumbs to an inner wall of a crumbing tank, pipe blockages caused by reaggregated large particle size crumbs, clogging of a screen by small particle size crumbs, and slipping in an extruder, and which can operate over a long period of time. The crumbing tank includes a stir shaft and an impeller, and also has a baffle plate on an inner wall face. The impeller has a knife blade. The baffle plate has an approximately triangular cross-sectional shape having, on a cross section in a cylindrical lateral direction of the crumbing tank, a side face on each of an upstream side and a downstream side with respect to a flow direction of a fluid, and in which the upstream-side side face and the downstream-side side face meet to form an intersection point.

An agitator mill including a grinding chamber containing grinding bodies and an agitator shaft, which revolves therein around a horizontal axis and which supports several grinding disks, which are connected thereto and which are spaced apart from one another in the direction of the horizontal axis and which move the grinding bodies, wherein grinding disks preferably in each case have slits or apertures, wherein adjacent grinding disks are arranged on the agitator shaft so that the ratio of the grinding chamber length to the radial grinding chamber height is greater than or equal to 2:3, and that the radial distance between the outer jacket surface of the grinding disks and the inner wall of the grinding container limiting the grinding chamber is more than 20% of the radial grinding chamber height.