This boom lift cylinder is the core power element of the drilling boom system in tunneling and mining drilling jumbos. Mounted between the carrier chassis and the front boom, it hydraulically raises and lowers the boom, precisely positioning the feed beam and rock drill to any height and angle on the tunnel face. An ultra-high-pressure medium-long-stroke design (rated 32 MPa, stroke 668 mm) delivers up to 566 kN of lifting force from a compact bore, withstanding the frequent impact recoil, boom deadweight, and side loads typical in hard rock drilling. Combined with a high-strength alloy steel barrel, a precision hard-chrome plated piston rod, multi-stage dust-proof seals, and bidirectional cushioning, it provides stable, reliable, and leak-free lifting motion under the severe conditions of high pressure, heavy dust, intense vibration, and cyclic operation — a key component for fast, accurate drilling positioning.