Trapping points
A belt conveyor can draw hands, clothing or tools between the belt and pulleys or rollers. Return sections and sides also matter. Apparently slow movement is not a reason to rely on human reaction. Protection must consider every accessible part, including those reached during cleaning or collection of spilt material.
Related concept: Machine safety.
Guards and access
Suitable guards prevent access to dangerous points. Crossings use designated walkways, without climbing over the belt or passing through exposed locations. The arrangement should facilitate inspection and maintenance without requiring guards to be removed during production. Falling material, dust and access by people not involved in the task are also considered.
Stopping does not mean isolation
Stop and emergency devices must be accessible and identifiable. Cleaning or clearing a blockage within a dangerous area requires control of unexpected startup and stored energy. A conveyor stopped at one push button may be restarted from another station. A procedure suited to the whole line is needed.
Cleaning as a critical operation
Removing adherent material while a conveyor runs may bring a tool and hand near an in-running nip. Safe cleaning systems and access should be anticipated in the design. Repeated spillage calls for investigation of its cause: feeding, alignment or containment. Increasing manual-cleaning frequency does not, by itself, resolve the danger.
Example of a brief intervention
At a hypothetical installation, an operator notices material accumulated on a pulley and intends to remove it quickly. The short duration does not reduce the trapping hazard. Work is organised with stopping, isolation and verification according to procedure before access. A second person near the button does not replace guarding and energy-isolation measures.
Lessons from accidents
The cited BINVAC case shows that a CE-marked line could still present dangerous access during cleaning. Marking does not remove the obligation to assess actual use. Reviews must check guards, controls and auxiliary tasks and ensure that restoration after maintenance returns the complete system to a safe condition.
