Roll crusher
Roller crushers are a special type of crushers . They are ideally suited for soft, brittle and medium-hard materials as well as for caked, moist, plastic and wet raw materials. Examples of raw materials are: limestone , marl , stones with earth, clay and mud and foreign bodies, gypsum , bauxite , kaolin , slate , coal , ore , slag , waste, asphalt rubble, demolition material, glass and ceramics .
Construction principle and working method
The roll crusher consists of two horizontally arranged rolls slowly rotating in opposite directions. The material to be broken is fed in the middle. One roller is stationary, the other can be moved and mounted hydraulically or resiliently as overload protection. Shear bolt couplings can also be installed for additional safety in the event of overload . The degree of comminution can easily be adjusted by changing the roller gap. The rollers can be smooth, with rings and cams or with “picks” (pyramid teeth). The fines present in the feed material pass through the gap between the two rollers through the crushing rollers without further comminution. The specific power requirement, wear and the fines produced in the end product are therefore significantly lower than with other crushers.
The degree of comminution is usually between 1: 3 and 1: 6. The largest roll crushers have a throughput of up to 14,000 t / h, the feed size can have edge lengths of up to 1.7 m. Roll crushers with a weight of 5 to 15 t and a throughput of 100 t / h to several hundred tonnes per hour are frequently used.