Tripper Luffing Cylinder

Bore diameter: Φ300mm – Φ400mm

Rod diameter: Φ200mm – Φ320mm

Stroke: 1,000mm – 4,500mm (per tripper luffing angle and boom length)

Operating pressure: continuous 28MPa, max 35MPa

Max push force: approx. 4,400 kN (at 35MPa, Φ400mm bore)

Max pull force: approx. 1,480 kN (at 35MPa, Φ400mm bore with Φ320mm rod)

Breakaway pressure: ≤0.4 MPa

Piston velocity: 0.03 – 0.2 m/s (smooth luffing)

Operating frequency: intermittent, several cycles per shift

Internal leakage: ≤0.03 ml/min (at 28MPa, over seal life)

Static holding: ≤2 mm piston drift over 24 h under full load lock (with counterbalance valve)

Temperature range: -40℃ to +100℃ (standard); -50℃ to +120℃ customizable

Suitable for: 5,000–20,000 t/h stacker reclaimers, bucket-wheel reclaimers, spreader tripper systems

Heavy-Duty High-Rigidity Structure

The barrel and piston rod are manufactured from high yield-ratio quenched & tempered alloy steel with FEA-optimized stress distribution. Thick-wall design and extended guide bushing withstand the impact and side loads during stacking/reclaiming mode switching, ensuring no deformation or weld cracking.

Integrated Counterbalance Valve, Safe Locking

A standard high-flow counterbalance valve or dual pilot-operated check valve locks the tripper precisely at any luffing angle. Even if the hydraulic system loses pressure, the tripper remains safely suspended, preventing equipment collision or belt misalignment from gravity-induced drift.

Low Friction, Precision Positioning

Filled PTFE and polyurethane composite seals keep breakaway pressure as low as 0.4 MPa. The cylinder moves smoothly with no stick-slip, allowing the operator to precisely adjust the tripper angle from the control room for rapid mode switching.

Special Anti-Corrosion Guide Bushing

The guide bushing is treated with QPQ salt bath nitriding or electroless nickel-phosphorus plating, paired with stainless steel retainer rings and high-performance wipers, thoroughly blocking rain, snow, coal dust, and ore fines from penetrating down the rod — eliminating rust seizure.

Comprehensive Surface Protection

The piston rod is available with hard chrome, Ni/Cr alloy plating, laser cladding, or ceramic thermal spray. The cylinder exterior is coated with weather-resistant epoxy, providing long-term protection against port weather, acidic/alkaline coal dust, and intense UV exposure.

Flexible Mounting & Maintenance-Free

Mounting dimensions and port orientations are customizable to the OEM gantry structure. Self-lubricating composite bushings in the clevises eliminate daily greasing and provide long service life in dusty, high-humidity environments.

Extended stroke design

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

Full stainless steel body and attachments

Ultra-low / ultra-high temperature sealing solutions

Explosion-proof / mining certifications