The steel decanter centrifuge has a rigid shaft and a flexible shaft. Generally, a centrifuge that is not too fast, has a large rotor diameter, and has good fluidity is usually designed as a rigid shaft. The original scientific research machine is designed as a rigid shaft, and its drum shaft has a large shaft diameter (Φ125mm). Its critical speed is greater than the working speed. The distance between the drum shaft and the supporting bearing is large (800mm). The large-size bearing is set and the whole rotation is set. The height of the shafting system is also correspondingly reduced. Since there is no vibration problem at the critical speed, the damping structure is simplified correspondingly, and the spherical support which is often required for the flexible shaft is eliminated.
The steel decanter centrifuge operates at a lower speed than its first-order critical speed, and has no vibration problems at excessive critical speeds, and can operate over a wide range of speeds. The structure of the rigid shaft itself can be set with a large-sized bearing, and the bearing has a good stress state, which can improve the life of the whole machine.
Drum structure and feeding mode of steel decanter centrifuge
The drum structure has a positive cup type and a reverse cup type, and the corresponding feeding modes are upper feeding and lower feeding. China's scientific research machine and engineering machine adopt inverted cup drum and lower feeding method, which has the advantages of shortening the length of the main shaft, simplifying the upper structure, and making the slag discharge smooth, and less pollution to the upper side during operation. The process pipelines are arranged in the lower part of the drum, which is beneficial to the lifting, overhaul and the like of the drum.