The roller crusher applies to cement, chemicals, power, metallurgy, building materials, refractories and other industrial sectors crushing medium hardness material, such as limestone, slag, coke, coal and other materials in the debris, crushing operations.
Roll Crushers can be used for primary and secondary crushing. The JOYAL Roll Crusher is generally regarded as a 4:1 feed to product ratio crusher; however in some instances, dependent upon material friability and hardness, it is possible to achieve a 6:1 crushing ratio.
The feed material should enter the centre of the gap between the two rolls and spread across the full roll width for maximum efficiency and this ensures a uniform product size distribution.
For strict coal product specifications the Osborn Double Roll Crusher is preferred. It is important to understand the material characteristics, as the type of coal will often vary considerably. Hardness, rock content, friability and moisture content are the major factors that need to be identified, together with the crusher capacity, maximum lump size, required product size and the amount of fines that are acceptable.
According to the principle of crushing, heavy-duty mining machinery used crushing machinery are jaw crusher, impact crusher, vertical shaft impact crusher, hydraulic cone crusher, hammer crusher, hammer crusher, roll crusher, compound crusher, cone crusher, two-stage crusher, gyratory crusher, mobile crusher
Efficient crushing will lower the power requirements and increase the life of the crusher segments. When the correct crushing ratio is used and the optimum roll diameters selected, the segments will grip the feed material more efficiently and it will also not allow pieces to roll on top of the segments due to the incorrect nip angle, this assists in reducing wear.
Crushing rolls and drive
Each roll assembly comprises of renewable and reversible toothed segments, bolted and keyed to a robust hexagonal hub with the nuts inside the hub. Locking nuts are securely located in fabricated pockets in the drum. This enables removal and replacement of segments from the outside using only one tool (Allan Key).
Bolt heads are protected from excessive wear by being counter sunk in recesses on each segment. Teeth are
arranged in a staggered formation on the segments to prevent tooth on tooth impact. Tooth proportions are designed for the particular product requireme.