Four shaft

The industrial four-shaft shredder is a device used for crushing of tough and brittle materials. The input material may contain metals including steel. It is suitable as a independent crushing machine for the first stage of material processing and preparation for further technological processing. There may be a sieve at the outlet of the crusher. The advantage of a four-shaft crusher over a two-shaft crusher is the uniform, relatively precisely defined output crumb. The size of the output crumb is approximately from 30 x 30 x 30 mm upwards.

The material is drawn between individual rotors rotating at different angular speeds. The shafts are fitted with rotary knives. Between the opposite knives, the material is cut and ground into pieces. The size of the crumb is determined by the width of the knives and the distance between the noses (teeth). The principle of operation of this crusher suits material with a tendency to arch in the inlet hopper. The primary crushing takes place between the lower central rotors and the outermost upper rotors serve to prevent arching of the material, which pour the material between the two central rotors from the sides of the shredder. At the same time, it cleans the stuffed material from the gaps of the primary rotors and returns it back to the cutting. At the same time, they lighten the operation of the shredder, which would otherwise have to deal with a lot of mechanical stress on the rotor shafts due to bending and friction of the material against the individual knives.

Knives made of tool steel heat-treated to a high level of hardness are capable of a long service life against wear. The supporting shafts of the full-segment knives are made of high-strength hardened steel and driven by either a combined gearbox or 4 pcs of heavy-duty planetary gearboxes.

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