Check List in Case of Screw Feeder Trouble

1.General questions Fault description

·         Ask plant operator when and under which circumstances feeder stops. Does feeder start without problems after long periods of non-operation?

·         Do weather conditions negatively influence feeder operation?

·         If valve is fitted to feeder outlet check the center line of the valve shaft is parallel with the center line of the feeder, as would be fitted in normal circumstances.

2.Silo check

·         Is the silo equipped with a deflecting or bridge breaking cone?

·         Does silo include a fluidization system? If so how does it operate? Automatically at intervals while feeder is turned on? Manually for emergency in case of bridging?

·         Is silo cone equipped with a vibrator or knocker? How does it work?

3.Electric equipment check

·         Is a drop in voltage possible through the contemporary starting of various machines?

·         Is the plant equipped with a generator?

·         Check main supply of motor.

·         Check electric motor is correctly wired and make sure wires are tightly fastened

·         Check adjustment of thermal cutout in the control panel and compare with data on the motor plate.

·         Check motor rotation.

·         Read amperage with feeder running empty, then with filled feeder starting, as well as with full feeder running

·         Check cross section of mains cables are suitable for the installed drive power.

4.Mechanical parts check

·         Is breather plug of gear reducer functioning?

·         Check outlet is free of crusts. Describe outlet (e.g. vertical or angular).

·         Check weigh hopper vent is functioning correctly and check correct dimensioning of same.

5.Feeder check

·         Are feeder parts correctly assembled? Do all inspection hatches point downwards?

·         Does feeder bend? Stretch a string. If necessary additional supports must be fitted.

·         Shut silo outlet valve. Empty feeder.

·         Open inspection hatches. Check intermediate bearings are okay and correctly mounted.

·         Turn feeder by hand using a spanner on the outlet end bearing shaft. If you don’t feel any resistance and don’t hear any grinding noise it is most certain that feeder is mechanically sound.

·         Shut inspection hatches. Start feeder. Read amperage, voltage, cycles and screw r.p.m with empty feeder running. Compare ammeter reading with motor plate data.

·         Repeat starting procedure with feeder at full load and read amperage, voltage and cycles.

6.Material check

·         Material description

·         Bulk density

·         Particle size

·         Humidity

·         Flow ability (make material slide down a metal plate by varying the angle from low to steep)

·         Compressive material

·         Abrasive material

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