Anti-collision and Precise Positioning for AMHS Overhead Cranes in High-Speed Operation

In the precious, space-constrained cleanrooms of wafer fabs, the OHT overhead cranes in AMHS systems must operate densely at speeds of up to 3–5 meters per second along complex aerial track networks, efficiently handling the flow of wafer cassettes (FOUPs). Once a collision or drop accident occurs, not only will expensive wafers be damaged, but the entire production line could also come to a standstill, resulting in immeasurable losses. Traditional obstacle-detection sensors often either are too bulky to be easily integrated into the compact crane bodies, or have low scanning frequencies that lead to delayed responses at high speeds. Moreover, these sensors struggle to accurately identify black or highly reflective foreign objects on the tracks, posing significant safety risks.

Application Logic: An ILS-F80 high-frequency anti-collision laser radar is embedded and installed at the diagonal positions (or at the front and rear ends) of the OHT overhead crane’s carriage. As the crane moves at high speed, the radar continuously builds a sensitive “virtual safety light curtain” along the direction of travel on the rail. It monitors in real time whether there are other vehicles stuck due to malfunctions, robotic arms that have not been fully retracted, or foreign objects on the track ahead. Based on the crane’s real-time speed, the system dynamically adjusts the range of the deceleration zone and the stopping zone, ensuring that braking is triggered within milliseconds upon detection of any hazard, thereby achieving non-contact, safe collision avoidance.

Technological Advantages: The ILS-F80 is a semiconductor-specific radar designed specifically to replace comparable imported products. It features an ultra-high scanning frequency of 50 Hz, with a response speed 25% faster than conventional radars, making it ideally suited to meet the safety requirements of high-speed overhead cranes. With its exceptionally compact dimensions of 50 mm × 50 mm × 70 mm, the F80 can be seamlessly integrated into the confined spaces of various OHT vehicle bodies. More importantly, the F80 has been optically optimized for semiconductor environments, offering outstanding performance in detecting black objects and highly reflective surfaces. Additionally, thanks to its intelligent algorithms, it can effectively filter out interference caused by the tracks themselves, making it the preferred sensing solution for domestically replacing AMHS systems.

Keywords:

Category:

Safety in Production and Efficiency

Electronic

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Anti-collision protection for Overhead Hoist Transporters (OHTs) in the synthetic fiber workshop

3D stereoscopic protection for the injection molding machine’s clamping area and part-taking station.

Anti-collision protection for Overhead Hoist Transporters (OHTs) in the synthetic fiber workshop

3D stereoscopic protection for the injection molding machine’s clamping area and part-taking station.

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