Roller crushers are used mainly for crushing easily fractured materials such as soft limestone, chalk, and clay.
In the cement industry, roller crushers are employed for primary and secondary crushing. Depending on the hardness of the material concerned, lumps are reduced to between a third and a fifth of their original size. Size reduction is effected by tearing and crushing the material between rollers.
The FLSmidth Roller Crusher Type E consists of two rollers with cast bosses. One of the roller shafts is adjustable while the other has a fixed position and is provided with a flywheel. The gap between the two rollers can be varied according to the degree of crushing required. Both rollers have scrapers to remove any material sticking to the surface.
The machinery is overload-protected by a plate punching device connected to the bearing of the adjustable roller, combined with a motor safety switch. If an extremely hard object is jammed between the rollers, the punching device is activated and the crusher and feed are stopped.
The motor power is transmitted through a geardrive and two cardan shafts to permit the adjustment of the space between the rollers.
The frame structure of the roller crusher comprises welded and cast steel parts which are bolted together. The rollers are provided with grease-lubricated roller bearings. The toothed wheels on the gear-drive are oil-immersed with grease lubricated shaft bearings.
FLSmidth roller crushers are very reliable in operation and require little maintenance and lubrication.
The FLSmidth Roller Crusher Type TS, designed for soft chalk and clay, is fitted with toothed roller sections for tearing large blocks of material before they are crushed in a subsequent process.
Roller crusher performances vary according to the degree of crushing required and the consistency of the material.
The roller crusher type designations indicate: E = single-step roller crusher, TS = roller crusher with toothed sections, followed by e.g. 120 x 150 = roller diameter x roller length in cm.