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Compensation Cylinder


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This compensation cylinder is a key auxiliary actuator of the drilling boom feed system in tunneling drilling jumbos, typically mounted between the boom tip and the feed beam base. Through its long-stroke hydraulic extension and retraction, it precisely compensates for the distance between the feed beam and the tunnel face, ensuring the rock drill maintains firm contact and advances evenly throughout the entire drilling cycle. Featuring a small-bore, long-stroke design (up to 1,800 mm), combined with specially chosen high-capacity guide rings and low-friction composite seals, it delivers smooth, stick-slip-free, low-leakage linear motion under the conditions of long cantilever projection, high-frequency reciprocation, and intense vibration impact — making it a core component for accurate drilling depth and borehole quality.

Brand:
PAZON

Compensation Cylinder Hydraulic Cylinder Hydraulic Cylinder Drilling Jumbo

Product Description

Bore: Φ70 mm
Rod: Φ50 mm
Stroke: 1,800 mm (per maximum feed beam compensation distance)
Operating pressure: continuous 10 MPa, max 12 MPa
Max push force: 46 kN (at 12 MPa, full-bore side)
Max pull force: 23 kN (at 12 MPa, annular side)
Breakaway pressure: ≤0.15 MPa (ultra-low friction, sensitive response)
Piston velocity: <0.5 m/s (fast follow-up compensation)
Operating frequency: dozens of reciprocating cycles per drilling round
Internal leakage: ≤0.02 ml/min (at 10 MPa, over seal service life)
Temperature range: -20 ℃ to +80 ℃ (standard); -40 ℃ to +120 ℃ customizable
Suitable for: fully hydraulic drilling jumbos, mining jumbos, etc.

Features & Benefits

Ultra-Long Stroke Compact Guidance
Embedded wide bronze or composite guide rings with an optimized rod-to-bore ratio maintain excellent bending stiffness even at the full 1,800 mm extension, preventing feed beam deviation and ensuring drilling straightness.
Ultra-Low Friction Sensitive Follow-Up
A filled PTFE and hydrolysis-resistant polyurethane composite seal package delivers an exceptionally low breakaway pressure (≤0.15 MPa), enabling smooth, stick-slip-free response during fine flow adjustments to meet the high-precision linear follow-up demands of the feed compensation system.
Heavy-Dust Environment Long-Term Protection
Multiple heavy-duty wipers and a metal scraper ring at the gland effectively block rock cuttings and slurry generated during drilling. The cylinder exterior features a high-weather-resistant coating to resist the humid, corrosive tunnel atmosphere.
Compact Maintenance-Free Design
The optimized mounting length fits the compact space at the boom tip. Self-lubricating composite bushings at all pivot points eliminate daily greasing and deliver long service life under extremely high-frequency compensation motion.
Optional Smart Monitoring
A built-in displacement sensor can be integrated to monitor the compensation stroke in real time, supporting digital drilling depth control via the jumbo’s electronic control system.

Customization Options

Special bore, rod, and extra-long stroke
Built-in displacement sensor
Full stainless steel body and piston rod
Explosion-proof / mining certifications
Special mounting distances and port configurations

Product Category

Compensation Cylinder

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