Coarseness and separation of substances
A pre-crushed grain reaches the secondary crusher and is broken into a grain band with a high proportion of coarse grain. The concrete is completely separated from the reinforcing steel. Thanks to the gentle process, there is little wear and tear and dust exposure is kept to a minimum. Grain sizes of 0-63 mm can be achieved economically.
The direct feed and the high crushing ratio are decisive also for the high efficiency of the secondary crusher. A pre-screening is not absolutely necessary. Smaller grain sizes pass through the crushing chamber without being further crushed. The material can be fed into the crusher directly or by means of a vibrating chute.
The crushing gap is hydraulically adjustable. This adjustability is also the heart of the overload protection. If foreign bodies that cannot be crushed have to pass the crushing chamber, the roller is pushed away and immediately after this process it moves back to its starting position.
Economy and energy efficiency
Due to the special tool contour and the synchronized roller rotation, the crushing tools penetrate the feed material in such a way that the foreign matter is effectively exposed by pressure and shearing. The steel content can be separated with a high degree of purity using a steel separator.
An important feature for the crushed material is the high proportion of valuable grain. A target grain size of 0-63 mm is typical for secondary size reduction. In order to achieve the highest possible proportion of valuable product, it is manufactured in a circular process.
Foreign substances such as wood or plastic are not shredded any further and can then be quickly removed from the material flow using common separation processes. In addition, the foreign matter is not processed into undesired fine fractions, which would contaminate the crushed material to a greater extent.