Screw Conveyors - The Guarding of
About fifteen percent of all conveyor accidents are associated
with screw conveyors, most injuries being due to an exposed screw at the
intake end. In addition to industrial accidents, there have been other
cases where unguarded portable conveyors used for farming purposes have
been left unsupervised, with resulting injuries to children and adults.
Spiral screws rotating within fixed casings have a shearing action, so
it is essential that all parts of the screws are securely fenced so that
there is no foreseeable risk of injury.
There are many different types of screw conveyors and they are used in
a wide variety of operations. This booklet indicates a number of different
methods of guarding for the guidance of manufacturers, owners and users
of these machines.
Table of Contents
1. INTRODUCTION
2. REQUIREMENTS OF THE MACHINERY ACT 1950
3. INDUSTRIAL SCREW CONVEYORS
3.1 General
3.2 Loading Points
3.3 Hoppers and Guards
3.4 Inspection and Sampling
3.5 Discharge Points
3.6 Material Build-up
4. SCREW ELEVATORS AND AUGERS
4.1 Prime Movers and Transmission Machinery
4.2 Intake Guarding
4.3 Silo Design
4.4 Discharge Openings
4.5 Bulk Feed Systems
4.6 Guarding of Transfer Points
5. OPERATING SAFETY
5.1 Lock Out Systems
5.2 Maintenance
5.2 Training
