Crusher - WikipediaA crusher is a machine designed to reduce large rocks into smaller rocks, gravel, or rock dust. . The earliest of these were in the foundries, but as coal took hold the larger . At the time, mines and foundries were virtually all small enterprises except for .. Jaw crushers are heavy duty machines and hence need to be robustly.principle of small coal jaw crushing machine,Crushers and Equipment Technology in Mining | Crushers .Primary Crushers; Jaw Crusher; Gyratory Crusher; Secondary and Tertiary Crushers . Crusher; Roll Crusher; Impact Crusher; Hammer Mill; Rotary Coal Breaker . concepts of crushers, including their types, principle, construction and usage. . The rock remains in the jaws until it is small enough to pass through the gap at.
principle of small coal jaw crushing machine