Hammer crusher (hammer mill) is applicable for various hard and fragile materials, such as limestone, coal, salt, gypsum, alum, brick and tile, etc. The crushing compressive strength of materials should not be in excess of 150Mpa. Hammer crusher is mainly used in industries such as cement, coal separation, electricity generation, building materials and compound fertilizer, etc. And hammer crusher can crush materials with different sizes into equal particle, which favors the next procedure. The advantages of hammer crusher are reliable mechanical structure, high productivity and favorable applicability.
The basic principle is straightforward. A hammer mill is essentially a steel drum containing a vertical or horizontal rotating shaft or drum on which hammers are mounted. The hammers are free to swing on the ends of the cross, or fixed to the central rotor. The rotor is spun at a high speed inside the drum while material is fed into a feed hopper. The material is impacted by the hammer bars and is thereby shredded and expelled through screens in the drum of a selected size.
The hammer mill can be used as a primary, secondary, or tertiary crusher. A major disadvantage of the hammer mill is the tremendous amount of wear (linings must constantly be replaced).
Small grain hammer mills can be operated on current. Large automobile shredders can use one or more 2000 horsepower (1.5 MW) diesel engines to power the hammer mill crusher.
The screenless hammer mill uses air flow to separate small particles from larger ones. It is designed to be more reliable, and is also claimed to be much cheaper and more energy efficient than regular hammer mills.
SBM Company manufactures a large variety of Hammer Mills to handle virtually any size reduction job. Rugged machines provide the efficiencies and economies of midair, impact crushing, grinding or shredding of diverse materials such as: limestone, glass, diatomaceous earth, coal & lignite, clay, shale sand, phosphate rock, fertilizer, aluminum oxide, slags, coke, tungsten carbide, silica, bauxite, dolomite, grain, cement rock - barytes.