Cone Crusher Eccentric Assembly
Cone crusher eccentric assembly including the eccentric, eccentric bushing, gear, and counterweight. The eccentric which has an offset bore provides the means whereby the head follows an eccentric path during each cycle of rotation. An eccentric bushing locked into the eccentric bore provides the bearing surface for the main shaft. A large bevel gear bolted to the bottom of the eccentric is driven by the pinion on the countershaft. The eccentric in turn rotates around the stationary main shaft. The entire assembly is supported by a series of thrust bearings; the bronze upper thrust bearing is bolted to the bottom of the eccentric and the steel stationary lower thrust bearing is bolted to the main frame. This series of thrust bearings reduce the frictional wear of the eccentric assembly. Backlash and root clearance between gear and pinion teeth are maintained in this assembly by the addition or subtraction of shims inserted beneath the lower thrust bearing. The counterweight installed on the eccentric has a light and heavy side and is positioned so as to reduce the unbalanced forces created by the crushing motion. Counterweight segments bolted to the counterweight fine-tune the balance, as required for various weight mantles. Protecting the counterweight from falling discharging material is the counterweight liner and cover welded to the counterweight.
Eccentric assembly installation
If the eccentric assembly was removed from the Crusher, due to weight limitations, the various parts of this assembly are to be installed as follows:
- Thoroughly clean the outside and top surfaces of the main shaft, the gear well surfaces of the main frame, and the bore of the eccentric bushing. Remove any nicks, scratches, and burrs. Clean the top surface of the lower thrust bearing fastened to the main frame and the bottom surface of the upper thrust bearing bolted to the underside of the eccentric.
- Make sure the socket head capscrews and spring washers holding the upper and lower thrust bearings are tight.
- Fasten the lifting ring to the top of the eccentric using the tapped holes in the top of the eccentric. Install two ring bolts, also from the toolbox, into the lifting ring. Apply a light coat of oil to the main shaft, eccentric bushing and both thrust bearings.
- Connect a suitable lifting device to the ring bolts and carefully lower the eccentric assembly over the main shaft. The beveled edge of the eccentric bushing will help center the assembly. Lower the assembly until the upper thrust bearing is resting on the lower thrust bearing. It may be necessary to rotate the eccentric slightly to fully mesh the gear into the pinion. Make sure the eccentric is fully seated on the lower thrust bearing.
- Be sure the gear and pinion have properly meshed and are in their correct relationship to each other. The backlash and root clearance should be set in accordance with the specifications listed. After satisfactory tooth backlash and root clearance have been established, the eccentric lifting plate is to be removed.
Removing eccentric assembly
To remove the eccentric assembly from the Crusher, for servicing or replacement of parts, proceed as follows :
- Fasten the lifting ring to the top of the eccentric using the tapped holes in the eccentric. Install two ring bolts into the lifting ring and connect to a suitable lifting device.
- Carefully lift the eccentric straight up off the main shaft.
- Carefully lift the assembly clear of the Crusher and lower it onto suitable cribbing.
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