Rotation Cylinder

Bore: Φ63 mm – Φ200 mm (full range)

Rod: Φ32 mm – Φ140 mm

Stroke: ≤3,000 mm (per arc displacement of the rotation mechanism)

Operating pressure: continuous 25 MPa, max 30 MPa

Max push force: 93 kN – 942 kN (at 30 MPa, full-bore side across the bore range)

Max pull force: 69 kN – 481 kN (at 30 MPa, annular side across the rod range)

Breakaway pressure: ≤0.4 MPa

Piston velocity: <0.5 m/s (smooth rotary response)

Operating frequency: high-frequency intermittent, several rotation positioning cycles per drilling cycle

Internal leakage: ≤0.03 ml/min (at 25 MPa, over seal service life)

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

Suitable for: fully hydraulic drilling jumbos, tunneling jumbos, mining jumbos, etc.

Wide Standardized Range

The full bore range from 63 mm to 200 mm provides thrust from 93 kN to 942 kN, meeting the boom rotation requirements of both medium and heavy drilling jumbos. Standardized interfaces facilitate OEM batch procurement and rapid replacement.

Heavy-Duty Anti-Vibration Construction

The barrel is forged from high-yield-ratio quenched and tempered alloy steel, with welds UT/MT inspected and end caps FEA-optimized. The piston rod is a large-diameter thick-walled rod, precision hard-chrome plated (HV900–1100), maintaining exceptional structural integrity under intense underground vibration and eccentric rotation loads. Fatigue life exceeds 1 million full-load cycles.

High Side-Load Resistance & Guidance

Wide-profile bronze or composite guide rings embedded in the bore, with precision clearance control, effectively absorb radial forces from fully-extended boom offset loads and drilling recoil, preventing rod scoring and ensuring long-term smooth rotation.

Multi-Stage Seals & Dust Protection

A metal scraper ring and multiple heavy-duty wipers at the gland effectively block rock dust, cuttings, and underground moisture. The main seal is a hydrolysis-resistant polyurethane and filled-PTFE composite, guaranteeing zero external leakage under high-pressure, high-frequency, and rock dust conditions.

Internal Cushioning for Noise Reduction

Progressive cushioning devices at both piston ends automatically decelerate and absorb impact energy at the rotation limits, eliminating rigid impacts, reducing noise, and protecting the rotation mechanism and the cylinder itself.

Compact & Maintenance-Free

The optimized envelope and mounting dimensions fit the compact slewing platform space of drilling jumbos. Self-lubricating composite bushings at all pivot points eliminate daily greasing and provide long service life under high-frequency rotation and harsh underground conditions.

Optional Smart Monitoring

A built-in displacement sensor can be integrated to provide real-time rotation angle feedback, supporting automated drilling positioning and anti-collision warning via the jumbo's electronic control system.

Special bore, rod, and stroke

Built-in displacement sensor for closed-loop rotation angle control

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

Explosion-proof / mining certifications

Special mounting distances and port configurations