Front Support Cylinder

Bore: Φ50 mm – Φ200 mm

Rod: Φ25 mm – Φ140 mm

Stroke: ≤3,000 mm

Operating pressure: continuous 21 MPa, max 25 MPa

Max push force: 49 kN – 785 kN (at 25 MPa, full-bore side)

Max pull force: 37 kN – 400 kN (at 25 MPa, annular side)

Breakaway pressure: ≤0.4 MPa

Piston velocity: <0.5 m/s

Operating frequency: intermittent, 1–2 support cycles per advance

Internal leakage: ≤0.03 ml/min (at 21 MPa, over seal life)

Static holding: ≤0.5 mm drift over 8 h under full load (with hydraulic lock)

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

Suitable for: roadheaders, comprehensive heading machines, tunnel roadheaders, etc.

Wide Standardized Range

Bore range from 50 to 200 mm provides thrust from 49 kN to 785 kN, precisely matching support requirements of everything from light coal-roadway machines to heavy hard-rock roadheaders. Standardized interfaces facilitate OEM batch integration.

Safe Load-Holding & Zero-Drift Locking

A standard integrated hydraulic lock or counterbalance valve keeps the support beam firmly held even if hydraulic hoses burst, preventing roof subsidence or support failure and ensuring personnel and equipment safety.

Heavy-Duty Anti-Vibration & Side-Load Resistance

The barrel is high-yield quenched & tempered steel with UT/MT welds. The large-diameter thick-walled piston rod is hard-chrome plated (HV900–1100), maintaining exceptional rigidity under uneven roof conditions, partial collapse loads, and cutting vibration.

High Side-Load Guidance

Wide bronze or composite guide rings with precise clearance absorb radial forces from support beam offset, preventing rod scoring and ensuring long-term smooth operation.

Multi-Stage Sealing & Dust Protection

A metal scraper ring and multiple wipers block coal dust, rock fines, and water. Hydrolysis-resistant polyurethane and filled-PTFE main seals guarantee zero external leakage over the cylinder’s lifetime.

Internal Cushioning for Noise Reduction

Progressive cushions at both ends eliminate end-stroke impacts, reduce noise, and protect the support arm and cylinder.

Compact & Maintenance-Free

The optimized envelope fits the tight space above the cutter head. Self-lubricating composite bushings at all pivot points eliminate daily greasing and provide long service life under harsh underground conditions.

Special bore, rod, and stroke

Built-in displacement sensor (for real-time support height monitoring)

Full stainless steel body and piston rod

Explosion-proof / mining certifications

Special mounting distances and port configurations