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1. June 2016

Cable-driven actuators: More flexibility for handling technology

match | Existing assembly cells are often not flexible enough and difficult to adapt to new processes. match is presently developing a modular cable-driven actuator system, providing parallel robots with additional mobility and rapid changeover times.

Parallel robots are able to position objects with high precision and at high speed, thus allowing for short cycle times. The main disadvantage of parallel-kinematic structures: They can position objects, but fall short when it comes to orienting them, i.e. align them in space. This makes them inflexible.
Researchers at the Institute of Assembly Technology (match) of Leibniz Universität Hannover are currently developing a structural enhancement for existing parallel robots. The structural enhancement, a serial wrist axis structure, is actuated via Bowden control cables. The actuators are decoupled from the moving robot structure.
There are two advantages: Firstly, heavy actuators do not have to be moved along with the robot structure. In contrast to previous commercial solutions, mass is reduced considerably and dynamics is increased. Secondly, the prototype can be mounted to any robot structure. Thanks to the modular design concept, existing assembly cells can be enhanced easily.

by Daniel Krebs

Significance for the production

  • Increased flexibility through additional mobility
  • High dynamics and short cycle times through decoupled actuators
  • Modularity for tailored adaption of existing assembly cells
  • Modular design principle: Avoidance of long changeover times and expensive new acquisitions
match_Seilzugaktorik_Bild1_01
Figure 1: The prototype developed at match is able to align objects three-dimensionally in space. (Photo: Daniel Krebs, match)
match_Seilzugaktorik_Bild3_DE_01
Figure 2: Actuated via Bowden control cables and decoupled from the moving robot structure. (Picture: Daniel Krebs, match)
Industrial robot working in factory,Conveyor Tracking Controler
Figure 3: Conventional parallel robots are able to position objects with high precision and at high speed, but cannot rotate them. (Photo: xiaoliangge - Fotalia.com)
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The enhancement developed at match provides parallel robots with an additional wrist axis which is actuated via Bowden cables. (Video: match)

Contact

Dipl. Ing. Daniel Krebs

+49 (0)511 762 18246
krebs@match.uni-hannover.de
www.match.uni-hannover.de

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