2012年（464）
分类： Delphi
2012-06-12 09:54:52
If seen from opposite side, there are two situations making the boards
produce large force during crusher operation. One is the upper centrum force
area, which is used in extra big ore and cracks near the cross section. The
other is discharging open force area, which is used for iron ore and is broken
by blogging force.
The reason for that is convenience. Due to scarcely check
the entering rock, there are often extra ore and iron ore entering into crusher,
thereby often the spindle fracture accident happens. Above all, users should try
to avoid extra size ore and iron entering into crusher, so that improve the
principal axis reliability, prolong service time and reduce economic loss. An
ore dressing factory failed gyratory crusher operation when initial stage of
production because of the serious wore of thrust button.
The reason analysis
and solution: Under heavy load, low pressure state, thrust button pushes plane
sliding thrust bearing at low speed. Owing to low speed, liquid lubrication is
replaced by boundary lubrication. Sometimes, the inappropriate contact can
produce localized contact, which increases pressure, destroys lubrication
conditions and makes wear worse.
The solution to that problem is perfect sealing, keeping lubricating oil
clean, improving working accuracy of thrust button installation. Originally, the
levelness radial error of footwall installation is 0.8-1mm. After improving, the
error range is 1.3-1.5 mm. When checking, we should guarantee the error of
vertical degree between machine axis and hanging wall, middle game and footwall
no more than the error range. Meanwhile, it can avoid middle game being out of
shape and contact area reduction by using scraping and finish turning method.
Thus it can guarantee over 80% of the contact area and uniform contacting area
distribution. Put the spare middle game on platform to avoid its being out of
shape. Adjusting tooth gear gap and the gasket in use should be processed
carefully to guarantee the levelness of footwall. The reasons for machine
trouble includes human factors such as long use time, inproper maintenance, and
natural factors such as machinery parts wear, corrosion, cavition and other
factors. While, the former can be avoided, the latter cann't. If we know
clearly the causes of machine trouble, understand the demage regulations and
take measures timely from design, manufacturing to running and maintenance, we
can reduce demage and prolong service time.
Typical mining machinery trouble
analysis
As for gyratory crusher, the spindle is key part, which consists of
cone with cone lining. There are many broken shaft accidents happened due to
various reasons.
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