Development of inspection magnetic wheel robot with pushing mechanism for flange running

In recent years, the deterioration of infrastructure facilities, such as bridges, has caused several problems. Currently, human inspectors conduct periodic inspections to identify damaged areas. However, this process is expensive and time-consuming. Therefore, robotic inspection has received significant attention. This study focused on magnet-wheeled inspection robots operating along complex multilevel paths. The movement from the bottom to the top surface of the flanges was particularly difficult, similar to that of an overhanging steel plate. As the motor drives the robot wheel, gravity and anti-torque interfere with the robot’s movement along its path. However, static analysis shows that the impact can be reduced depending on the robot’s posture relative to that of the flange. Therefore, a magnetic-wheeled robot with a posture-changing pushing mechanism is proposed. This study confirms that the proposed robot can travel along its path using a pushing mechanism while carrying a 1.0 kg weight. Therefore, the robot’s ability to conduct inspections while carrying heavy equipment, such as inspection devices, was confirmed.