Abstract
Machine guards are commonly used safety measures. The aim of the research was to determine the possibilities and limitations in the application of logic circuits providing interlocking and locking safety functions associated with guards. Particular attention was paid to the prevention of the defeating of guards. In further works it is planned to develop a methodology for the selection and design of those devices.
Highlights
Work on automated machines/lines relies on the supervision of the production process and intervention in the event of irregularities
General objective underlying the undertaking of research work was to determine the possibilities and restrictions of using logic circuits ensuring the implementation of the safety function of interlocking and locking at movable guards, allowing to reduce the risk associated with the use of machinery
● hazardous functions cannot be performed until the guard is closed, ● opening the guard when the machine performs hazardous functions causes a stop command, ● hazardous functions can be performed while the guard is closed; just closing the guard does not start the hazardous machine functions
Summary
Work on automated machines/lines relies on the supervision of the production process and intervention in the event of irregularities. The reason for intervention is stopping the process due to jams or faulty operation of technological sensors. Interventions require quick and frequent access to danger zones. For this reason, safety measures based on control methods and limiting access to hazardous areas are widely used in reducing the risk of accidents. The most common safety measures limiting access to danger zones in machines are guards, including movable guards, equipped with locking or interlockig devices
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