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Pitch Cylinder


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This pitch cylinder is a key actuator of the drilling boom attitude adjustment system in bolting jumbos, mounted at the articulation point between the boom tip and the feed beam. It extends and retracts to tilt the feed beam up and down, enabling precise pitch angle positioning of the rock drill for anchor bolt installation at the designed angle to achieve optimal reinforcement of the surrounding rock. A compact medium-stroke design (514 mm stroke) delivers 173 kN of thrust at 22 MPa. Combined with a high-strength alloy steel barrel, a precision hard-chrome plated piston rod, multi-stage dust-proof seals, and bidirectional cushioning, it provides stable, precise, leak-free pitch motion under the severe conditions of underground high dust, humidity, and intense vibration — a key component for ensuring bolting quality and construction safety.

Brand:
PAZON

Pitch Cylinder Hydraulic Cylinder Hydraulic Cylinder Bolting Jumbo

Product Description

Bore: Φ100 mm
Rod: Φ50 mm
Stroke: 514 mm (per feed beam pitch angle range)
Operating pressure: continuous 20 MPa, max 22 MPa
Max push force: 173 kN (at 22 MPa, full-bore side)
Max pull force: 130 kN (at 22 MPa, annular side)
Breakaway pressure: ≤0.3 MPa
Piston velocity: <0.5 m/s (rapid pitch response)
Operating frequency: high-frequency intermittent, several pitch positioning cycles per bolt installation
Internal leakage: ≤0.03 ml/min (at 20 MPa, over seal service life)
Temperature range: -20 ℃ to +80 ℃ (standard); -40 ℃ to +120 ℃ customizable
Suitable for: fully hydraulic bolting jumbos, combined bolter-miners, etc.

Features & Benefits

Precision Pitch Positioning
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 high structural rigidity under frequent impacts and heavy vibration, ensuring accurate anchor bolt drilling angle.
High Side-Load Resistance & Guidance
Embedded wide bronze or composite guide rings with precision clearance control absorb radial forces from feed beam side loads and drilling recoil, preventing rod scoring and ensuring long-term smooth motion.
Multi-Stage Seals & Dust Protection
Multiple heavy-duty wipers and a metal scraper ring 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 end strokes, eliminating rigid impacts, reducing noise, and protecting the articulation points and the cylinder itself.
Compact Maintenance-Free Design
The optimized envelope and mounting dimensions fit the compact boom-tip space. Self-lubricating composite bushings at all pivot points eliminate daily greasing and provide long service life under high-frequency pitch positioning.
Optional Smart Monitoring
A built-in displacement sensor can be integrated to provide real-time pitch angle feedback, supporting automated anchor bolt drilling positioning via the jumbo’s electronic control system.