Best of Germany 2014 - Mining Equipment and Mining Technology

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6 • Coal Age Indonesia | October 2016 Introduction The Kubria ® cone crusher from Thyssen- krupp (see Fig. 1) has proved effective for many years under the toughest appli- cation conditions in the field for hard-rock crushing. It is used mainly in the aggre- gates industry for the secondary and ter- tiary crushing of granite, basalt, gneiss and other hard rock, as well as in the mining and cement industries. The Kubria ® product line was recent- ly updated to include the latest techni- cal developments, and standardised 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. Fig. 1: Kubria ® cone crusher Design and function The Kubria ® crusher design has a hy- draulically supported main shaft and fixed upper crusher chamber. Crushing takes place between the concaves in the crushing chamber and the mantle lined crushing cone (see Fig. 2), which is ro- tated by an eccentric drive in the lower section. This design allows the gap between the concaves and the crushing cone to be continuously decreased or increased all around the periphery. As the crushing chamber narrows, crushing of the mate- rial is achieved by means of increasing pressure on the rock. The geometry of the crushing chamber and the eccentric stroke can be individually adapted to specific crushing requirements as de- termined by the material characteristics. This is particularly important when the raw material properties or the product re- quirements change during the service life of the crusher. Fig. 2: Main components of the Kubria ® cone crusher The maximum possible feed size for the crusher is determined by the opening width at the top of the crushing chamber. The finished product lump size is deter- mined by the closed-side setting (CSS) in the discharge zone. The wear material components in the crusher are made of wear-resistant austenitic manganese steel that can be replaced easily. The crushing cone con- sists 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" mod- els for coarse crushing are additionally equipped with annular arranged con- caves. 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 mate- rial 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 big- ger motors. In addition, these crushers are characterised by a long service life and easy accessibility for maintenance work. The crusher is equipped with a circu- lating lubrication system to supply oil to the eccentric bush bearing assembly, the axial bearing assembly and the bev- el gears, and is also equipped with an automatic grease lubrication unit for the spider bearing. Today's quarry operations increasing- ly require automation of plant systems . This also applies to the crushing circuit. The Kubria ® crusher is typically deliv- ered 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 tempera- tures and the oil flow conditions. Further, important operating data such as operat- ing hours and load and no-load hours, as well as the number of pressure and power peaks, can be called up. The crushing set- ting is regulated automatically according to adjustable power and pressure limits. Au- tomatic setting adjustment is carried out to keep the product quality of the crusher The new Kubria ® cone crusher from thyssenkrupp Authored by: Peter Berlitz Dr. Armin Greune Sponsored Content

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