초록 ▼

A bowl mill having a separator body, a grinding table and a plurality of grinding rolls for exerting grinding forces on material to be ground is provided with a plenum and a vane assembly for controlling the pressure conditions in the separator body. The vane assembly includes a plurality of vanes w

A bowl mill having a separator body, a grinding table and a plurality of grinding rolls for exerting grinding forces on material to be ground is provided with a plenum and a vane assembly for controlling the pressure conditions in the separator body. The vane assembly includes a plurality of vanes which rotate within the plenum to propel air from the plenum into an upper region of the separator body. This arrangement prevents or minimizes the penetration or migration of ground material into a lower region of the separator body of the bowl mill.

대표청구항 ▼

[ I claim:] [1.] In a bowl mill operative for pulverizing material into smaller particles, the bowl mill having a separator body, a grinding table supported on a shaft for rotation within the separator body, at least one grinding roll supported within the separator body so as to be operable to exert

[ I claim:] [1.] In a bowl mill operative for pulverizing material into smaller particles, the bowl mill having a separator body, a grinding table supported on a shaft for rotation within the separator body, at least one grinding roll supported within the separator body so as to be operable to exert a grinding force on material disposed on the grinding table for effecting the pulverization thereof, and the separator body having an upper region in which the grinding table and the at least one grinding roll are located and in which an upper region pressure condition exists and a lower region separate from the upper region and having a lower pressure condition than the pressure condition of the upper region atmosphere, the improvement comprising:means forming a plenum communicating with the upper and lower regions including means forming at least one inlet opening communicating with the plenum and the lower region of the separator body and means forming at least one outlet opening communicating with the plenum and the upper region of the separator body, the outlet opening forming means including a shaft associated portion and a second portion spaced from the shaft associated portion to form the outlet opening therebetween;a vane assembly including at least one vane and a vane support for supporting the vane for rotation about a vane axis, the vane assembly being disposed relative to the plenum for movement of the at least one vane within the plenum during rotation of the vane about the vane axis; andmeans interconnecting the vane assembly and a power source for rotatably driving the vane about the vane axis such that air in the plenum is subjected to a pressurization greater than that of the upper region of the separator body at the outlet opening, whereby the rotation of the vane within the plenum draws air from the lower region of the separator body into the plenum via the inlet opening and propels air from the plenum into the upper region of the separator body via the outlet opening.