Slewing Bearing for Crane: Precision Engineering for Heavy-Duty Lifting Solutions
As a professional manufacturer specializing in the ZZ industry, we understand that the heart of any crane operation lies in its ability to rotate smoothly under immense pressure. Our slewing bearing for crane applications is engineered to deliver exceptional reliability, ensuring your machinery performs flawlessly in the most demanding environments, from bustling construction sites to busy shipping ports.
Product Overview
A slewing bearing, often referred to as a turntable bearing or swing bearing, is a critical component that enables rotational movement between two machine parts while simultaneously supporting combined loads. In the context of cranes, our bearings act as the "machine's joint," facilitating the seamless rotation of the upper structure relative to the undercarriage.
Our slewing bearings are designed to accommodate axial force, radial force, and tilting moments all at once. This multi-directional load capacity makes them indispensable for various crane types, including mobile cranes, tower cranes, and harbor cranes. By integrating high-strength alloy materials with advanced heat treatment, we provide a component that minimizes friction and maximizes operational life.
Product Performance and Quality
At ZZ, quality is not just a metric; it is our foundation. We employ rigorous manufacturing standards to ensure every slewing ring meets the highest industrial expectations.
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Superior Material Selection: We utilize high-grade alloy structural steel (such as 42CrMo or 50Mn) which offers high hardenability and excellent mechanical properties.
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Advanced Heat Treatment: Our raceways undergo precise induction hardening (Medium Frequency Quenching), achieving a surface hardness of HRC 55-62. This ensures deep hardening layers and high resistance to wear and deformation.
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Precision Machining: Utilizing CNC machining centers, we maintain strict tolerances on gear teeth and mounting surfaces. This precision ensures smooth meshing with the pinion and reduces backlash during operation.
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Robust Sealing: Our bearings feature multi-lip seals made from high-quality rubber (often polyurethane or fluororubber), providing superior protection against dust, water, and contaminants, which is vital for outdoor crane operations.
Technical Specifications
We offer a wide range of standard and non-standard designs to fit various crane models. Below are the common series we manufacture:
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Series Type
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Structure Description
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Load Capacity Characteristics
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Typical Application
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Single-Row Four-Point Contact Ball
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Compact structure, two raceways, single row of steel balls.
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Supports axial, radial, and tilting loads. High static load capacity.
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Tower cranes, small mobile cranes, welding manipulators.
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Double-Row Ball (Different Diameter)
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Three raceways, two rows of steel balls with different diameters.
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High axial and tilting moment capacity. Robust structure.
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Truck cranes, medium-duty lifting equipment.
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Three-Row Roller
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Three separate raceways with cylindrical rollers.
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Highest load capacity. Separates radial and axial loads effectively.
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Heavy-duty port cranes, large crawler cranes, offshore cranes.
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Crossed Roller
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Single row of rollers arranged at 90° to each other.
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High rigidity and rotational accuracy. Compact design.
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Precision robotic arms, high-speed slewing units.
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Note: We can customize gear modules (external or internal teeth) and bolt hole patterns according to your specific drawings.
Certifications and Standards
To ensure global compatibility and safety, our manufacturing processes adhere to international standards.
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ISO 9001:2008: Quality Management System certification ensures consistent product quality.
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ISO 14001:2004: Environmental management compliance.
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OHSAS 18001:2007: Occupational health and safety standards.
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CCS Certificate: Approved by the China Classification Society for marine and offshore applications.
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JB/T 2300-2011: Manufactured in strict accordance with Chinese Machinery Industry Standards.
Product Services
We pride ourselves on being more than just a manufacturer; we are your partner in mechanical solutions.
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Custom Design: Our engineering team can design non-standard slewing bearings based on your specific load calculations and spatial constraints.
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Global Logistics: We have extensive experience exporting to Europe, America, and Southeast Asia, ensuring safe and timely delivery.
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After-Sales Support: We provide comprehensive technical support, including installation guidance and maintenance advice to extend the service life of your bearings.
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OEM/ODM: We support original equipment manufacturing to help you build your brand.
Product Applications
Our slewing bearings are the driving force behind a wide array of heavy machinery:
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Construction Machinery: Mobile cranes, tower cranes, and crawler cranes.
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Port and Maritime: Ship-to-shore cranes, floating cranes, and container handling equipment.
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Industrial Equipment: Wind turbine generators, concrete pump trucks, and aerial work platforms.
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Specialized Machinery: Radar antennas, missile launchers, and robotic welding stations.
Frequently Asked Questions (FAQ)
Q1: What is the typical lead time for a slewing bearing for a crane?
A: For standard models, we often have stock or can manufacture within 15-20 days. For customized, large-diameter bearings, the lead time is typically 30-45 days depending on the complexity.
Q2: How do I choose the right slewing bearing for my crane?
A: Selection depends on the axial load, radial load, and tilting moment your crane exerts. Please provide us with your load data and mounting dimensions, and our engineers will recommend the most suitable series (e.g., Single-row ball vs. Three-row roller).
Q3: Do you provide gears with the bearings?
A: Yes, we can manufacture slewing rings with external gears, internal gears, or without gears entirely, machined to your required module and pressure angle.
Q4: What kind of packaging do you use for export?
A: We use sturdy wooden cases or pallets suitable for sea freight, with anti-rust oil applied to the bearing surface to prevent corrosion during transit.
