The Kubria cone crusher from thyssenkrupp has proved effective for many years under the toughest application conditions in the field for hard-rock crushing, according to the company. It is used mainly in the aggregates industry for the secondary and tertiary crushing of granite, basalt, gneiss and other hard rock, as well as in the mining and cement industries.
The Kubria product line was recently updated to include the latest technical developments, and standardized to assure uniform manufacturing standards maintained at thyssenkrupp locations around the world. The result is that the crusher can now be offered very competitively and with significantly lower delivery times.
The Kubria crusher design has a hydraulically supported main shaft and fixed upper crusher chamber. This design allows the gap between the concaves and the crushing cone to be continuously decreased or increased all around the periphery. The geometry of the crushing chamber and the eccentric stroke can be individually adapted to specific crushing requirements as determined by the material characteristics. This is particularly important when the raw material properties or the product requirements change during the service life of the crusher.
The wear material components in the crusher are made of wear-resistant austenitic manganese steel that can be replaced easily. The crushing cone consists of a mantle fit on the cone body that is in turn firmly connected to the main shaft. The crushing ring is fastened in the top shell of the crusher. “G” models for coarse crushing are additionally equipped with annular arranged concaves.
The top shell and bottom shell are both made of cast steel. The “spider” in the upper area of the top shell is used to support the upper shaft bearing. This spider is also made of cast steel and has spider arm liners. As all wear parts and heavy internal removable components parts are accessible from above, the crusher is very easy to maintain.
A thrust bearing is used to support the main shaft on a hydraulic cylinder. This cylinder is used to control the crusher setting by raising and lowering the shaft. If tramp material is experienced in the crushing chamber, the shaft is lowered automatically, allowing the tramp material to largely pass through the crushing chamber without resulting in damage to the crusher. For run of mine materials that are very hard and tough to crush, the main shaft is equipped with a hydrostatic thrust bearing assembly for operating at high crushing pressures.
The drive and the hydraulic cylinder are housed in the bottom shell of the crusher. The Kubria bevel gear teeth are cut with a cyclo-palloid process that was specially developed for this crusher. It provides for smooth, low-wear operation, which also allows higher drive powers to be transmitted. The result is that Kubria cone crushers can be equipped with bigger motors. In addition, these crushers are characterised by a long service life and easy accessibility for maintenance work.
The crusher is equipped with a circulating lubrication system to supply oil to the eccentric bush bearing assembly, the axial bearing assembly and the bevel gears, and is also equipped with an automatic grease lubrication unit for the spider bearing.
Today’s quarry operations increasingly require automation of plant systems. This also applies to the crushing circuit. The Kubria crusher is typically delivered with the proven Kubriamatic control system, which can be integrated into the control system and the dynamic process display of the overall plant.
With the Kubriamatic control system, the crusher settings can be changed during operation. It is also used to enter and monitor the crusher-specific operating data such as closed-side setting, operating power and pressures, as well as temperatures and the oil flow conditions. Further, important operating data such as operating hours and load and no-load hours, as well as the number of pressure and power peaks, can be called up. The crushing setting is regulated automatically according to adjustable power and pressure limits. Automatic setting adjustment is carried out to keep the product quality of the crusher constant as the crusher concaves and mantle liners wear.