typical hazard and safeguarding methods of screw conveyor

Screw Conveyors

Hazards:

Screw conveyors are troughs with a revolving shaft with a spiral or twisted plate. In-going nip points for the entire length of the screw conveyor exist between the revolving shaft and trough. Because the trough may be covered and the conveyor may be located at or near floor level, screw conveyors can be particularly dangerous. 

Hazards Controls:

Screw conveyor housing must completely enclose moving elements (screw mechanism and power transmission apparatus), except for loading and discharge points. Permanent affixed grids or polycarbonate can be installed for visibility purposes to allow the operator to monitor the operation. Besides, trough side walls should be higher to prevent workers from reaching into or falling into the trough. If it is an open troughs, workers must be protected by secondary safeguarding methods such as railing or fence. Feeding loading and discharge points can be guarded by enclosures, screening, grating, or some other interruption across the openings which allow the passage of materials but do not allow entry of the body. 

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