In highly automated semiconductor wafer fabrication facilities, the Overhead Hoist Transport (OHT) system acts as a high-speed "artery," responsible for precisely transporting wafers between sophisticated equipment. Within this extremely high-value system, hydraulic buffers play a critically important role—they are the "silent guardians" that ensure the OHT operates smoothly, cleanly, and reliably.
Semiconductor manufacturing imposes extremely stringent requirements on the environment. Any slight vibration can cause wafer misalignment or damage, leading to enormous losses; the slightest particle contamination can compromise product yield. Therefore, the OHT system must not only run at high speeds but, more importantly, must start and stop smoothly, position precisely, and operate cleanly and quietly.
Hydraulic buffers are precisely the key components that meet these demanding requirements. Through their unique hydraulic damping principle, they convert the massive impact kinetic energy generated during the OHT's horizontal travel and vertical lifting into thermal energy, achieving linear, smooth, and rebound-free deceleration. This ensures that the OHT stops accurately at every designated position, avoiding vibrations caused by rigid collisions, fundamentally protecting the delicate wafers, while also significantly reducing operating noise.
Unlike spring or polyurethane buffers, hydraulic buffers feature high energy absorption efficiency and a rebound-free characteristic, making them highly suitable for the high-frequency, high-intensity applications of the semiconductor industry. More importantly, to meet cleanroom requirements, specialized hydraulic buffers are made of stainless steel, utilize special sealing technology, and employ low-volatility hydraulic oil, fundamentally eliminating the generation of particulate and magnetic contamination, achieving long service life and maintenance-free reliable operation.
It can be said that in the semiconductor manufacturing field, which pursues the utmost perfection, although hydraulic buffers are small, they are one of the core details that ensure the precision, efficiency, and safe operation of the OHT system, and are an indispensable precision component of modern wafer fabs.
