Ball-and-race-type pulverizer
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ball-and-race-type pulverizer
(¦böl ən ¦rās ′tīp ′pəl·və′rīz·ər)
(mechanical engineering) A grinding machine in which balls rotate under an applied force between two races to crush materials, such as coal, to fine consistency. Also known as ball-bearing pulverizer.
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Ball-and-race-type pulverizer
A grinding machine in which balls rotate under pressure to crush materials, such as coal, to a fine consistency. The material is usually fed through a chute to the inside of a ring of closely spaced balls. In most designs the upper spring-loaded race applies pressure to the balls, and the lower race rotates and grinds the coarse material between it and the balls (see illustration). Two or more rings of balls can be cascaded in one machine to obtain greater capacity or output. Counterrotating top and bottom rings also are used to increase pulverizer capacity. Such pulverizers are compact and the power required per ton of material ground is relatively low. See also Crushing and pulverizing.
Coarse raw material is ground by crushing and attrition between balls and races and is then withdrawn from the pulverizer by an airstream.
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Mentioned in
Grinding mill
(mechanical engineering)
Crushing and pulverizing
(mechanical engineering)