Common Problems in Vibrating Screens and Ways to Solve Them

December 12, 2019

Static equipment lines work efficiently in mines, although they don’t provide much in the way of additional flow momentum. In contrast, vibrating screens provide plenty of sorting impetus, but there’s more to go wrong. All of that oscillating energy, it seems like those vibrations cause screening difficulties to multiply. Of some concern here, as the sorting rate experiences a fall off, there’s a matching rise in equipment wear.

Correcting Service Life Declines

All of that shaking and shimmying, it exerts a punishing amount of mechanical stress. Motor mounts loosen, then the shaking worsens. At some point, the equipment fails because the stress is tearing the frame apart. An adjustment to the stroke amplitude will help matters. To entirely halt the machine weakening energies, the motor base should be tightened. Better yet, a repair technician might want to add a set of rubber dampeners between the motor and its mount.

When Vibrating Screens Fall Silent

The equipment is stationary when it should be performing its vibratory stroke. It’s either silent or a nasty buzzing sound is echoing off the mine walls. There’s also a smell of burning varnish in the air. In all likelihood, the motor is damaged. If the electric motor is still working but the screens are motionless, then a coupling between the drive system and the counterweights has broken. A new motor, a rewinding service, a coupling or bearing repair, these are all common problems, so a spare motor should be kept on standby as a productivity preserver.

The Teamwork Time-Saving Approach

Many mines pair technicians or train them so that they can work in two entirely separate work domains. With the team-up approach, mechanics and electricians work together. If a cable fault or sensor outage is detected by an electrical troubleshooting procedure, the faulty component immediately gets replaced. If the vibrational screens are suffering from a machine linkage defect, then that motion transmitting assembly is either reattached or replaced.

It’s not hard to diagnose a screening issue when the decks have fallen quiet. A digital voltmeter checks for power, then the damaged wires are swapped out for a new set of heavily insulated cables. Intermittent faults are harder to fix. If it’s a stroke or amplitude problem, are both levels of the deck operating synchronously? If not, abnormal material flow conditions will be observed. Connecting bolts and vibrational couplers should all be tested to see if they’re holding true. As for the heat and noise issues that occur, these sensory disturbing influences are keenly felt when the gear is stuck in a subterranean chamber. A tech needs to check out the motors, bearings, and drive system components before these equipment disturbances can impact personnel productivity figures.

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