Circular connectors, with their advantages of vibration resistance through threaded locking, high-protection sealing, and the ability to integrate power, signals, and high-speed communication, are widely used in all structural components of robots—including servo joints of industrial robotic arms, end-effectors, machine vision sensors, AGV drive units, and control cabinet interconnections—to ensure stable power supply, sensor transmission, and real-time data exchange during long-term repetitive motion.