Design of Direct Teaching Behavior of Collaborative Robot Based on Force Interaction

Direct teaching can help users without the expertise of robots to quickly program a robot and plan trajectories in a complex environment. It is one of the typical applications of human-robot cooperation for improving production efficiency. However, the existing direct teaching system and related research have the problem that the human-robot communication is not intuitive enough, and the personnel safety in the teaching-playback process cannot be fully guaranteed. Based on the self-developed torque-controlled robot platform, we propose a force interaction method to achieve natural command communication. Then, combined with the analysis of the security threats in the operation process, a proper behavior of the direct teaching robot is designed to form a complete teaching-playback strategy. The proposed force recognition method and direct teaching behavior are verified on a 7-DOF collaborative robot.