Protective Lattice Layer for Cobots

Collaborative robots (short: cobots) become increasingly present in manufacturing. Designed to work alongside humans in shared areas, they work together ‘hand in hand’  – which makes it crucial to ensure safety by avoiding collisions of cobot and human co-worker.

This is prevalently achieved by inherent optical sensors which trigger an immediate stop of the cobot in case of unexpected contact: whenever a human co-worker enters the defined warning zone, the system lowers its speed to a minimum and if the person keeps approaching, the system stops – only after the individuum departs, the system accelerates back to full speed. It’s obvious: this results in highly limited processing speeds of the cobot and thus higher cost and lower productivity for the manufacturing company. These interruptions in the workflow may lead to unstable cycle times as well, and foremost – it is absolutely contrary to the intention of cobots being deployed flexibly and easy to integrate as a plug-and-play system: To achieve an appropriate reaction to an approaching human co-worker, cobots have to be programmed accordingly; always depending on the cobot’s task, its exact form of cooperation with the human worker, and its physical position in the factory. Whenever the cobot is deployed at another workstation on the assembly line, or performs different tasks and movements, its programming has to be adapted. This limited flexibility only allows pre-defined reactions of the cobot.

The benefits of the lattice RoboSkin are manifold. Putting safety first, it reduces the risk of injuries to human workers interacting with the cobot. At the same time, production speed can be increased strikingly: Since the collision forces and pressures are highly damped by the RoboSkin, the cobot’s speed can accordingly be higher up to 150 percent– thus enabling increased productivity for the manufacturer.

The overall handling of the skin is easy: Because the RoboSkin works as a mechanical collision buffer, it requires no additional sensors, just the TPU layer that takes up only minimal installation space and is mounted with an easy system. Moreover, the lattice design of the skin is easily, rapidly and cost-effectively adaptable to every cobot type, thanks to the advantages of 3D printing. In production halls, cobots are often deployed at different workstations. The RoboSkin eliminates the need for dismantling, re-assembly and re-calibration, thus saving time and cost.

An additional benefit of the lattice structure is that it acts as permeable skin, preventing heat accumulation thanks to its open structure. What’s more, it serves as an isolating layer as it covers the cobot’s supply hoses and wires. At the same time, it works without restricting the cobot’s movements, overheating, additional sensors, or work area surveillance.