1. Product Overview
The ZZ Offshore Crane Slewing Ring is a high-precision, heavy-duty rotary joint designed specifically for the harsh marine environment. Often referred to as the "joint of the machine," this slewing bearing serves as the core transmission component connecting the crane's upper structure and the base. It is engineered to withstand complex combined loads, including significant axial force, radial force, and tilting moments, ensuring stable 360-degree rotation even under extreme sea conditions.
2. Product Performance & Quality
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Corrosion Resistance: Utilizing advanced surface treatment technologies (such as zinc-nickel plating or specialized marine coatings) and high-grade stainless steel seals, the product offers superior resistance to salt spray and seawater corrosion.
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High Load Capacity: Optimized internal raceway design and the use of high-strength alloy steel (e.g., 42CrMo, 50Mn) ensure the bearing can support massive lifting loads and impact forces.
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Sealing Performance: Equipped with multi-layer labyrinth seals and rubber sealing strips to effectively prevent the intrusion of seawater, sand, and debris, extending service life.
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Low Friction: Precision machining of raceways and high-quality lubrication ensure low starting torque and smooth rotation.
3. Technical Specifications
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Type: Single-row four-point contact ball, Double-row ball, or Three-row roller (depending on load requirements).
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Material: High-strength bearing steel or alloy structural steel (42CrMo4, 50Mn, etc.).
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Hardness: Raceway surface hardness reaches HRC 55-62 through induction hardening.
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Gear Options: External gear, Internal gear, or Gearless.
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Diameter Range: Customizable from small diameters to several meters (e.g., Φ200mm - Φ5000mm+).
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Precision: High rotational accuracy with strict control over axial and radial runout.
4. Certification Standards
ZZ Slewing Bearings are manufactured in strict accordance with international standards and have passed rigorous quality inspections:
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ISO 9001: International Quality Management System Certification.
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CCS: China Classification Society Certification.
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BV / LR / DNV: Available upon request (Bureau Veritas, Lloyd's Register, DNV).
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CE Marking: Compliant with European safety and health requirements.
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JB/T 2300: Chinese Machinery Industry Standard for Slewing Bearings.
5. Product Services
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Customized Design: We provide non-standard design services based on specific customer drawings or application scenarios.
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Technical Support: Comprehensive installation guidance, including torque specifications and mating surface flatness requirements.
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After-sales Warranty: Professional after-sales team providing lifetime technical support and spare parts supply (pinions, seals).
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Global Logistics: Secure packaging suitable for ocean freight to ensure safe delivery to any port worldwide.
6. Product Applications
The ZZ Offshore Crane Slewing Ring is widely used in various marine and heavy-duty engineering machinery:
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Ship Cranes: Deck cranes, provision cranes, and cargo handling cranes.
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Offshore Platforms: Drilling rigs and maintenance cranes on oil and gas platforms.
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Port Machinery: Gantry cranes, container cranes, and ship-to-shore cranes.
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Wind Power: Installation vessels and offshore wind turbine maintenance cranes.
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Rescue Vehicles: Heavy-duty rescue and salvage operations at sea.
