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maintenance & Housekeeping: 33
Jaw crusher maintenance indication system
Ronez > Les Vardes Quarry, Guernsey > 01481 256426
Maintenance staff at Aggregate Industries’ Guernsey quarry are required
to enter the primary jaw crusher to perform routine wear part replacement
and clear blockages. Operatives identified a potential hazard within the jaw
flywheel which, if stopped at the centre at the top, could begin moving when
the jaw was worked on, due to the release of stored potential energy.
The maintenance team manufactured an arrow indicator from sheet metal
and painted it red to aid visibility. The crusher was then shutdown and
observed on rundown until it had stopped at the bottom of its stroke. The
arrow indicator was then tapped to two of the flywheel cap bolts to indicate
the safe position of the jaw.
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Cleaning out below primary crusher
Huntsmans Quarries > Naunton Quarry, Gloucestershire > 01451 850555
The area below the impact primary crusher, around the conveyor tail drum, regularly builds up with dust
and debris. To clear the space, an operative had to lock off the machinery and enter a restricted area to
shovel out the waste in a crouched position.
To improve safety, the company designed a sump hole in the well and inserted a submersible pump,
capable of pumping up to 20mm in size. This enables the area to be hosed down on a daily basis without
entering the restricted space, and for the material to be pumped to a safe location for removal by a skidsteer
loader. Only on rare occasions does an operative need to enter the restricted area when maintaining
the tail drum, at which point the few larger pieces of material can be removed.
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Tipper body props
Hanson Aggregates > South East region > 01622 679641
Hanson Aggregates identified a trend in the company’s South East region
of tipper vehicle drivers inspecting or maintaining their trucks with the
body raised, but without employing sufficient safeguards against a
hydraulic failure. This was discussed at the area safety representatives’
meeting and a suggestion was put forward to provide purpose-built body props at all sites.
The props are lightweight and easy to handle to both encourage their use and allow them to be placed in
position without undue effort. They are also universal and will fit all body types. Prior to their issue, the
driver is talked through the safe working practice and issued with a set of instructions.
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Now all quarries and asphalt plants in the region have two body props, held in the weighbridge, for use by
delivery drivers as and when required.
Body prop for tipper vehicles
Midland Quarry Products > Edwin Richards Quarry, West Midlands > 0121 561 4400
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At Edwin Richards Quarry in the West Midlands, Midland Quarry Products recognised that a
problem existed at the “lorry wash station”, when the underneath of the body and chassis
of road vehicles were being cleaned, inspected, or worked upon. There was a lack of a suitable body prop,
which could be used for all makes, types and sizes of vehicles.
The remedy entailed a steel beam which can be wound across the underside of a vehicle body by a handcranked
chain pulley system. The beam is then located onto support steelwork on the other side.