Double roll crushers are used for both primary and secondary crushing. They guarantee strictly defined final grain size with a minimum usage of grains.
The Feed Materials
Raw materials, secondary materials and by-products such as lignite, coke, sinter, coal, soft to medium-hard rock, ore, chalk, iron ore and similar products.
The Mode of Operation
The crushing rolls are individually driven in counter-rotation by electro-motors with coupling and gears, via V-belts. The crushing material is fed into the machine by means of conveyors or similar aggregates while it is spread over the whole width of the roll. An optimum use of the crushing tools and uniform belt charging are thus achieved. Roller diameter, tooth form and circumferential speed are adjusted to the type and the size of the feeding material in relation to the required final grain size.
The Special Characteristics
The crushing rolls consist of the roller bodies, complemented with crushing rings or crushing shells. The rolls are secured either with anchor bolts and end disks or bolted with screws. In order to facilitate maintenance, the crushing roll shafts are arranged in heavy-duty cast steel housings with lubricated, amply dimensioned spherical roller bearings. Materials used are of highly wear-resistant, specially cast alloys in order to achieve longevity of parts.
To influence the final grain size by changing the gap and to compensate wear and tear, one of the tow crushing rolls is designed as a loose roll. The adjustment is done mechanically, hydraulically or electro-mechanically.
Overload protection is always integrated.
- The mechanical vertical adjustment
Two swivel arms located in the housing of the machine are linked by means of a transversal bar. The gap width is changed by adjusting the loose roll, aided by a hand-operated hollow thread shaft.
- The mechanical horizontal adjustment
The thread shafts directly affect both the loose roll sliding bearings, located in guiding skids.
- The hydraulic vertical adjustment
If the required power can no longer be achieved manually, hydraulic cylinders take over the loose roll adjustment.
- The mechanical horizontal adjustment The hydraulic horizontal adjustment consists of two hydraulic differential cylinders and the accompanying hydraulic aggregate. All of the mechanical adjustment functions are fully integrated into the hydraulic system.
- High and constant capacity
- Low susceptibility to breakdowns
- Long life
- Gentle crushing
- Easy replacement of worn and spare parts
- Wide range of application
With a minimum of fine grains