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La réduction du risque résiduel (ou R3) identifie et minimise de manière systématique les dangers restants sur le lieu de travail une fois que les dispositifs de sécurité existants ont été mis en place. Alors que l’OSHA définit des normes minimales de sécurité, l’approche R3 va plus loin en identifiant et en réduisant de manière proactive les risques résiduels, même lorsque ces normes sont déjà respectées, afin de créer un environnement de travail plus sûr, au-delà de la simple conformité légale.
Dynatect propose des solutions telles que des protections flexibles, des barrières physiques articulées, des limiteurs de couple ou des dispositifs de sécurité machine pour réduire les dangers associés aux pièces mécaniques mobiles et aux zones de pincement.
Les protections machines sont des dispositifs, accessoires ou systèmes de sécurité conçus pour protéger les opérateurs contre les blessures liées à l’utilisation d’équipements dangereux. Il existe plusieurs types de protections, y compris fixes, à interverrouillage, réglables et auto-ajustables. Ces dispositifs empêchent tout contact avec :
Les dispositifs de protection machine contribuent également à renforcer la culture de sécurité au sein de l’entreprise, peuvent réduire les coûts d’assurance, et facilitent la conformité avec les exigences légales — un enjeu essentiel pour la continuité des opérations. Par exemple, les réglementations OSHA imposent une protection antichute pour toute ouverture dépassant deux pouces (voir 1910.28 b pour plus de détails). Cela concerne notamment les fosses d’inspection ou de machines. Si des garde-corps ou harnais de sécurité sont des solutions possibles, les couvercles rétractables praticables sont une alternative plus pratique : ils ne gênent pas l’accès (contrairement aux garde-corps qui doivent être enlevés et remis en place) et ne nécessitent pas d’équipement de sécurité complexe (comme les harnais avec points d’ancrage en hauteur).
Au-delà de la prévention des blessures, les dispositifs de protection peuvent également améliorer la productivité en réduisant les arrêts de production dus aux accidents.
The Gortite VF Automated Machine Safety Door is intended for machine guarding in automated work cells. Typical applications include automated production and machine processes that require preventive measures, such as robotic welding, processing, and transport tasks.
The safety interlock option meets PLE/Cat-4 safety requirements when combined with appropriate logic and conformance to risk assessment.
Additional safety features:
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Large machine tools such as planer mills are often installed partially below floor level, resulting in potentially hazardous pits. Often, workers must remove pit grates or slats to service the machine. Here, metal roll-up, walk-on covers offer an alternative. Typically made of reinforced stainless steel, these covers allow partial pit access while preventing falls at other times or into other pit areas.
Dynatect’s walk-on roll-up covers create a continuous, protective, and walkable surface that makes maintenance easy.
Case in point: One aircraft manufacturer uses large fiber placement machines to build fuselages from composites. Adjustable tailstocks of the two-station machine travel on guideways located in a pit below floor level. Production workers must access workpieces as they’re produced, necessitating pit covers during production, yet also requiring a way to remove the covers for repairs and adjustments. Grating is time-consuming to move, and slats require complex support structures that complicate maintenance tasks. Instead, the aircraft manufacturer uses rugged walk-on metal pit covers with extruded aluminum stiffening ribs bonded to stainless steel sheets; there are no hinges to collect debris. These roll up onto steel rollers equipped with take-up mechanisms.
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Roll-up covers can also be used to enclose chemical tanks and other vessels to contain fumes or prevent injury. These covers are not designed to support the weight of workers, so they are made of lighter materials such as polypropylene to withstand corrosive fumes. Wiper strips can keep the cover under tension and remove debris before retraction; electric motors and gear drives are employed in the take-up mechanisms.
Dynatect developed the ChemTank Cover in response to the demand for convenient and space-saving chemical tank covers. Tank covers help contain evaporative emissions. The ChemTank is a corrosion-resistant roll-up cover system that helps control heat and evaporation. It consists of a PVDF-coated PVC shade and compatible hardware for higher corrosive and higher temperature applications. With chemical and surface finishing processes in mind, the cover was designed for a wide variety of process tanks applications including chemicals, anodizing, etching, plating, cleaning, and more.
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Automated machines may experience unintentional obstructions, such as rotating parts or small access doors driven by a gear mechanism. Dynatect’s mechanical slip clutches have been added to systems to allow safer interaction.
In one such example, a slip clutch is part of a disabled-access system that automates a door’s opening and closing. The slip clutch allows obstructions to the operation without causing injury or damaging the drive motor.
In another application, a slip clutch was integrated into the driveshaft of a food prep machine’s rotating arm to add mechanical safety for the operator.
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Scissor lift mechanisms, tilt tables, and similar equipment represent potential sources of injury because pinch points can be created when these mechanisms move. One way to protect against these hazards is to enclose moving parts with bellows that deter personnel from reaching into hazardous areas — yet permit machinery motion. Other benefits are improved machinery aesthetics and protection against dust, debris, and foreign objects.
Dynatect makes large-format bellows (“lift covers”) to cover the pinch points of lift tables or scissors mechanisms. In one iteration, heavy-duty accordion-type skirting is made from PVC/nylon and rigid aluminum extrusions with vented corners. The resulting rigid, movable cover is suitable for lift tables and vertical-motion applications. Vents allow uniform airflow during operation, while optional maintenance straps allow for regular inspection and maintenance of the lift mechanism.
For applications necessitating lateral and linear motion, such as medical table bases, imaging tables, dental chairs, and amusement rides, bellows can be constructed using various materials and internal wires that maintain the necessary shape. Fabrication from a myriad of materials is possible, including some that meet UL burn standards or incorporate antimicrobial agents. Suitable for shear-type or lateral movement, the design’s compactness allows retraction into tight spaces.
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Large CNC machining centers require special effort to minimize the impact of dust and sound on surrounding work areas while still allowing access for loading and unloading large workpieces and tooling. In the examples shown below, a 5-axis machining center incorporates a retractable roof cover over its enclosure to answer both needs.
Do your production processes generate dust or small particles?
Machine roof covers were developed to contain debris and airborne contamination without creating interference or obstructions in the machining center’s travel.
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For the ventilation of motors or engines in facilities or transportation applications (locomotives and railcars), rugged, flexible ducting is integral to the solution. Dynatect’s bellows/ducts/ motor-boots can be designed with materials available to meet regulatory compliance for flame, smoke, and toxicity (NFPA 130, EN45545)
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Dynatect shade rollers are custom-made protective roll-up covers for machine guarding, consisting of coated or uncoated textile material attached to an industrial spring roller. Metal housing can be added to protect the roll-up mechanism. Shade rollers are a simple and cost-effective solution for involuntary contact with machine components.
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Telescopic Springs (aka spiral springs/spring guards) protect against accidents and mechanical damage wherever there are rotating parts, such as a spindle or ball screw on a machine tool.
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