Arm Cylinder

Bore: Φ100 mm – Φ200 mm

Rod: Φ50 mm – Φ140 mm

Stroke: ≤3,000 mm

Operating pressure: continuous 35 MPa, max 40 MPa

Max push force: 314 kN – 1,257 kN (at 40 MPa, full-bore side)

Max pull force: 236 kN – 641 kN (at 40 MPa, annular side)

Breakaway pressure: ≤0.5 MPa

Piston velocity: <0.5 m/s

Operating frequency: heavy-duty, several pitch adjustments per cutting cycle

Internal leakage: ≤0.03 ml/min (at 35 MPa, over seal life)

Temperature range: -20 ℃ to +80 ℃ (standard); -40 ℃ to +120 ℃ customizable

Suitable for: heavy hard-rock roadheaders, rock drift roadheaders

Ultra-High Pressure Precision Pitching

Remains rock-solid under maximum load to maintain precise cutting depth control in the hardest rock.

Impact & Side-Load Resistance

Ultra-high-strength forged barrel and wide special bronze guide rings absorb severe off-axis loads during cutting.

High-Rigidity Long-Life Structure

Massive rods with special hardened plating resist abrasion from sharp rock chips and corrosive mine water.

Zero-Leak High-Pressure Sealing

Metal scrapers and multi-stage wipers protect hydrolysis-resistant polyurethane and filled-PTFE seals.

Internal Cushioning

Progressive cushions protect the articulation points from end-stroke impacts.

Smart Monitoring Ready

Accepts built-in displacement sensors for real-time arm angle feedback.

Special bore, rod, and extra-long stroke

Built-in displacement sensor

Full stainless steel construction

Explosion-proof / mining certifications