Concrete blocks with steel reinforcement

When defining the feed material in a crushing plant, edge length and piece size are important factors to ensure the functionality of the entire crushing process. Until now, the size of the acceptable feed material in the crushing plant is limited, which in return causes the demolition company high costs for pre-crushing. The typical maximum feed size in crushing plants for crushing rubble and concrete is 700 mm. With larger feed items, the crusher can be damaged or clogged, or wear increases disproportionately.

With the primary crusher from Crush + Size, this limitation can be largely eliminated. Feed sizes with edge lengths of up to 1,700 mm and thicknesses of approx. 700 mm can be processed quickly by the primary crusher.

Process properties

Characteristic for the primary crusher are the direct and efficient feed as well as the rough pre-crushing of the feed material to a grain size of 0 - 250 mm. A pre-screening is not necessary. Smaller grain sizes pass through the crushing chamber without being further crushed. The material feed can be carried out directly or by means of a vibrating trough.

The crushing gap can be adjusted hydraulically. The hydraulic gap adjustment is also the heart of the overload protection system when foreign bodies that cannot be crushed have to pass through the crushing chamber. In this case a roller is pushed away and immediately after this process moves back to its starting position.

Economy and energy efficiency

With the help of a primary crusher of the type DRC 900-20, a large part of the preparatory work of the feed material can be saved. This preparatory work is otherwise carried out with great effort by crawler excavators with attachments such as pulverizers and hydraulic hammers, which also significantly increases the undesired fine fraction in the feed material and the final product.

The average power requirement of the Crush + Size primary crusher is extremely low. The energy consumption during preparatory work by an excavator with hydraulic attachments is many times higher. With a throughput of 200 t/h, which can be achieved with the primary crusher DRC 900-20, the profitability calculation clearly speaks in favour of using the primary crusher of Crush + Size.

Another advantage of this primary crusher is that fine grain is only produced in small quantities. This enables the production of a coarse-grained, high-quality recycling material in the further crushing process.