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Dolomite Crusher Provider In South Africa

Dolomite Crusher Provider In South Africa

Dolomite Crusher “Speeding”

The So-Called “Speeding”

When the Dolomite Crusher is in no-load, the taper sleeve on the thin side of the eccentric bushing is in contact with the main shaft. The friction torque generated at the contact point drives the cone to rotate in the same direction (unsynchronized) as the eccentric bushing. If the frictional moment and the reverse frictional moment of the bowl-shaped bearing acting on the spherical surface of the cone are equal, the constant rotation of the cone can be maintained. For some reason, the balance of the cone is broken, its rotation speed is getting faster and faster, and finally “flying”, this is what we call “speeding”.

6 Reasons For “Speeding”

  • 1. There is less contact point between the taper sleeve and the main shaft, and a “flying” occurs in the breakage gap of the crusher, which is actually still a “running” air train. If the pressure is still not applied after the feeding, the speed of the spindle rotation will be lost.
  • 2. The taper sleeve cracks during operation, the contact surface with the spindle becomes smaller, and the oil film is destroyed, so that the dry friction temperature increases rapidly and “speeds”.
  • 3. When the taper sleeve is operated, it is affected by the non-crushed material (over-iron), causing the load to be too large, and the zinc filling is detached, causing the taper sleeve to smash, and the gap between the main shaft and the taper sleeve becomes smaller and “flying”.
  • 4. When the crusher is running, a large amount of heat will be generated between the transmission parts. Under normal circumstances, the heat is released through the heat exchanger, thereby achieving the heat balance of the system. If the heat is too large, exceeds the cooling capacity of the cooler, or there is a problem with the cooler, the heat transfer efficiency is lowered and the heat balance is broken. The oil temperature continues to rise, the oil film strength decreases and dry friction occurs, and even burns occur in sliding contact portions such as bowl-shaped bearings, vertical sleeves, taper sleeves, and bushings. The hoop between the taper sleeve and the main shaft causes a “flying”. Occasionally, the oil supply is interrupted due to the failure of the thin oil system, and the interlock protection of the pressure relay does not function, so that the sliding contact portion is rapidly and severely burned, accompanied by a violent “flying”. This is a very dangerous situation and can cause serious consequences if not stopped in time.
  • 5. The installation clearance between the main shaft and the taper sleeve is too small, or the wear of the bowl-shaped bearing is thinned for a long time, and the cone sinks to cause the gap to become smaller, resulting in additional load between the taper sleeve and the main shaft, and the contact stress is greatly increased, and the oil film is destroyed. Cause “speed”.
  • 6. The outer surface of the main shaft is seriously worn, and even the grooves of different depths appear, causing the contact between the shaft and the cone to deteriorate and causing the “speeding”.

In any case, the “flying car” will have a taper sleeve burn, and most of the burns occur on the side of the thin side of the eccentric bushing, and it occurs more than 1/4 of the length from the upper mouth. It can be said that the origin of the “speeding” accident is between the main shaft and the taper sleeve.

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