Rotation Cylinder

Bore: Φ80 mm

Rod: Φ36 mm

Stroke: 340 mm (corresponding to the arc displacement of the rotation angle)

Operating pressure: continuous 16 MPa, max 18 MPa

Max push force: 90 kN (at 18 MPa, full-bore side)

Max pull force: 72 kN (at 18 MPa, annular side)

Breakaway pressure: ≤0.3 MPa (low-friction seals, sensitive response)

Piston velocity: <0.5 m/s

Operating frequency: intermittent, several rotary adjustments per tamping cycle

Internal leakage: ≤0.025 ml/min (at 16 MPa, over seal service life)

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

Suitable for: railway tamping machines, turnout tamping machines, multi-purpose maintenance trains, etc.

Powerful Force & Precise Positioning

The barrel is forged from high-yield-ratio quenched and tempered alloy steel, with critical welds UT/MT inspected. The large-diameter thick-walled piston rod is precision hard-chrome plated (HV900–1100), providing extremely rigid support under rotary side-load components and ensuring accurate, drift-free angular positioning.

High Side-Load Resistance & Long-Life Guidance

Wide-profile bronze or composite guide rings embedded in the bore, with precision clearance control, effectively absorb the eccentric lateral forces transmitted during tamping, preventing rod scoring and maintaining long-term smooth operation.

Multi-Stage Seals & Heavy-Duty Dust Protection

A metal scraper ring and multiple heavy-duty wipers at the gland completely block ballast chips, iron dust, and muddy water. The main seal is a hydrolysis-resistant polyurethane and filled PTFE composite, guaranteeing zero external leakage over the entire service life in dusty, wet outdoor environments.

Internal Cushioning for Noise & Shock Reduction

Progressive cushions at both piston ends automatically decelerate and absorb energy at the rotation limits, eliminating rigid mechanical impacts, significantly reducing operating noise, and extending the service life of both the mechanical structure and the cylinder.

Compact Construction & Maintenance-Free Pivots

Optimized mounting dimensions suit the tight rotary swing-arm space on tamping machines. Self-lubricating composite bushings in the clevises eliminate the need for daily greasing and provide exceptionally long service life under high-frequency, heavy-load operation.

Optional Smart Monitoring

A built-in magnetostrictive displacement sensor can be integrated to provide real-time feedback on rotary stroke and angle, enabling precise closed-loop control of rotation and fault warning via the vehicle’s main control system.

Special bore, rod, and stroke

Built-in displacement sensor

Full stainless steel body and piston rod (highly corrosive environments)

Explosion-proof / mining certifications

Special mounting distances and port configurations