Telescopic Cylinder

Bore: Φ50 mm

Rod: Φ35 mm

Stroke: 805 mm

Operating pressure: continuous 16 MPa, max 20 MPa

Max push force: 39 kN (at 20 MPa, full-bore side)

Max pull force: 20 kN (at 20 MPa, annular side)

Breakaway pressure: ≤0.2 MPa (ultra-low friction)

Piston velocity: 0.03 – 0.4 m/s (smooth feed, quick retract)

Operating frequency: continuous cycling, dozens of strokes per hour

Internal leakage: ≤0.02 ml/min (at 16 MPa, over seal life)

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

Suitable for: longhole production rigs, fan-drilling rigs, bolting rigs, etc.

Precision Feed Force

The 39 kN continuous thrust maintains constant bit pressure for straight, accurate blastholes, essential for longhole drilling.

Lightweight with High Rigidity

The barrel is high-yield steel, honed bore. The rod is hard-chrome plated (HV900–1100), providing excellent bending stiffness over the full 805 mm extension to keep the feed beam stable.

Ultra-Low Breakaway & Anti-Stick-Slip

Filled-PTFE and hydrolysis-resistant polyurethane seals provide a breakaway pressure as low as 0.2 MPa for smooth, stick-slip-free motion even during fine flow adjustments.

Heavy-Duty Dust Protection

A metal scraper ring and multiple wipers prevent rock dust and water ingress, protecting seals from abrasion and ensuring zero external leakage over the cylinder’s life.

Internal Cushioning

Progressive cushions at both ends eliminate end-stroke impacts and reduce noise, protecting the slide and cylinder.

Maintenance-Free & Smart-Ready

Self-lubricating composite bushings at both pivots require no greasing. An optional built-in displacement sensor provides real-time position feedback for closed-loop feed depth control.

Special bore, rod, and stroke

Built-in displacement sensor

Full stainless steel construction

Explosion-proof / mining certifications

Special mounting distances and port configurations