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Safety in Work Cells

This article discusses safety issues, mechanisms, and equipment to prevent accidents in robotic work cells. It highlights common accidents and preventive measures such as safeguarding devices, training, and maintenance protocols for operators, programmers, and maintenance personnel. The emphasis is on implementing safety devices like electronic curtains, floor pads, emergency stops, and interlocks to secure work cells and reduce the risk of accidents. Proper work cell design, personnel training, and maintenance practices are crucial to ensuring a safe working environment in robotic work cells.

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Safety in Work Cells

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  1. Safety in Work Cells • Issues, mechanisms and equipment, preventative measures

  2. Accidents in Robotic Work Cells • Persons struck or pinched by robots while inside work envelope (through human error in teaching, careless approach, maintenance, or regular operation). • Persons struck by objects manipulated, dropped, or ejected from work cells. • Persons over-riding safety devices.

  3. Areas of Emphasis to reduce Robot Accidents 1. Safeguarding (Warning) Devices 2. Personnel Training 3. Preventive Maintenance

  4. Safeguarding Devices • Electronic curtains, motion detectors • Pressure sensitive floor pads • Emergency Stop • Interlock- electrical circuit switch, removes power if open

  5. Safeguarding Devices: • Awareness Barriers- physical device/visual indicator (fence, painted lines, signs) • Awareness signals- audible sound/visible light device • Training- operator, maintenance, programmer

  6. Perimeter Safeguarding – Cell Shields

  7. Access Prevention Devices – Light Curtains

  8. Access Prevention Devices – Light Curtains

  9. Access Prevention Devices – Pressure Sensitive Floor Mats

  10. Access Prevention Devices – Proximity Laser Sensors

  11. Access Prevention/Emergency Stop Devices – Interlocks

  12. Emergency Stop Devices – Pressure Sensitive Edges

  13. Emergency Stop Devices – Pull-Type Switches

  14. Perimeter Safeguarding – Welding Curtains

  15. Perimeter Safeguarding – Retro-Reflective Sensors

  16. Warning Devices – Andon Lights

  17. Safeguarding the Operator • Prevent the operator from being in the robot work envelope when the robot moving • Proper training to handle problems

  18. Safeguarding the Programmer • When teaching, equipment must be under control of programmer • The robot system can operate at high speed under only special operational conditions • Only programmer allowed in the robot work space when teaching

  19. Safeguarding Maintenance/Repair Personnel: • Do not assume robot movements • Always know where the closest emergency stop is • Avoid pinch points at all times • Know the robot (watch for problems)

  20. Work Cell Design • Cell operations should be designed to minimize human injury • Cells should be designed to allow access by humans • Cells should promote visual communication (of process status, access to emergency stops, and warnings of hazards. • Cells should undergo a risk assessment program before operating.

  21. Other Support Articles • Safety Mats Article • Safety Devices Article • Interlock Article • Light Curtains Article

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