Vibration sensor

Most modern screens are designed with the benefit of computer simulation and can cope with a wide range of operational conditions.

However, variations in feed rates and composition of the material being processed can, in some circumstances, result in an excessive amount of material being on the screen. If, as a result, the rate and speed of vibration of the screen slows down, even temporarily, problems can quickly occur.

Material continues to be fed on to the screen at the normal rate but the slowdown causes the discharge rate to be reduced; a marginal overload can quickly enter a runaway situation with material arriving at the screen causing an ever increasing overload and further slowdown. Mechanical failure, v-belt ‘burn off’ or the intervention of the drive motors’ electrical overload is often the first time the operator will know that all is not well.

Rotech’s vibration sensor fitted to a screen is designed to monitor its rate of vibration and will operate an alarm or switch the in-feed conveyor off if the screen slows down. Even a drop in speed of 5% for a few milli-seconds can be detected and action taken almost instantaneously. On v-belt-driven screens the drive motor can be switched off the moment any slippage occurs, preventing damage to the belts.

Rotech Systems, Unit 53 Canal Bridge Centre, Ellesmere Port, Cheshire CH65 4EH; tel: (0151) 356 2322; fax: (0151) 356 2437.