Crane Slewing Ring: Heavy-Duty Rotation Solutions by ZZ
At ZZ, we understand that the crane slewing ring is the critical "joint" of your lifting machinery. It is not just a bearing; it is the foundation of safety and stability. As a professional manufacturer, we engineer our slewing rings to withstand extreme dynamic loads and harsh environmental conditions, ensuring your cranes operate with precision and reliability.
🏗️ Product Overview
Our crane slewing rings are designed to bridge the connection between the crane's upper structure (boom/superstructure) and the undercarriage (chassis). They are engineered to simultaneously support complex combined loads:
-
Axial Force: Vertical lifting weight.
-
Radial Force: Horizontal forces during movement.
-
Tilting Moment: The overturning force caused by the load radius.
Whether for mobile cranes, crawler cranes, or tower cranes, ZZ delivers robust rotation solutions that guarantee long service life and minimal maintenance.
🛡️ Performance & Quality
We utilize advanced manufacturing processes to ensure every slewing ring meets the highest industry standards.
-
Material Excellence: We use high-strength alloy structural steel (such as 42CrMo4, 50Mn) to ensure high toughness and fatigue resistance.
-
Precision Hardening: Our raceways undergo precise induction hardening, achieving a hardness depth that resists pitting and deformation under heavy loads.
-
Sealing Technology: To withstand dust, moisture, and mud, our rings feature multi-lip rubber seals or labyrinth seals, ensuring grease retention and contaminant exclusion.
-
Gear Accuracy: For driven applications, our external or internal gears are precision-cut (milled or hobbed) to ensure smooth meshing with the pinion and low backlash.
⚙️ Technical Specifications
ZZ offers a wide range of standard and custom designs. Below are the common specifications for our crane slewing rings:
|
Parameter
|
Specification Details
|
|
Product Name
|
Crane Slewing Ring / Slewing Bearing
|
|
Structure Type
|
Single-row Four-point Contact Ball, Double-row Ball, or Three-row Roller
|
|
Outer Diameter
|
200mm – 5000mm+ (Customizable)
|
|
Material
|
42CrMo4, 50Mn, C45, or equivalent alloy steel
|
|
Hardness
|
Raceway: 55-62 HRC; Teeth: 50-55 HRC (if applicable)
|
|
Gear Type
|
External Gear, Internal Gear, or Gearless
|
|
Sealing
|
NBR / Fluororubber Seals (Dust-proof & Water-proof)
|
|
Lubrication
|
Grease lubrication with standard grease nipples
|
|
Precision Grade
|
P6 / P5 / P4 (According to ISO standards)
|
📜 Certifications & Standards
Quality is the core of ZZ. Our manufacturing processes and products comply with international standards to ensure global compatibility and safety.
-
ISO 9001: Certified Quality Management System.
-
JB/T 2300: Chinese Machinery Industry Standard for Slewing Bearings.
-
DIN / ISO: Compliance with international dimensional and tolerance standards.
-
CE Certification: Meeting European safety and health requirements.
🛠️ Applications
Our slewing rings are widely used across various heavy industries. Specifically for cranes, we specialize in:
-
Mobile Cranes (All-Terrain & Rough-Terrain): Requiring compact, high-load capacity bearings.
-
Crawler Cranes: Needing massive three-row roller bearings for extreme stability.
-
Tower Cranes: Utilizing high-precision rings for smooth slewing at great heights.
-
Harbor & Ship Cranes: Designed with enhanced corrosion resistance for marine environments.
-
Truck-Mounted Cranes: Compact designs for hydraulic knuckle boom cranes.
💡 ZZ Service & Support
We don't just sell bearings; we provide solutions.
-
OEM/ODM Services: We can design and manufacture slewing rings based on your specific drawings or application requirements.
-
Fast Delivery: Optimized production lines ensure on-time delivery for your project schedules.
-
Technical Support: Our engineering team provides installation guidance and maintenance advice to prevent premature failure.
-
Warranty: Comprehensive warranty coverage on all our manufactured units.
❓ Frequently Asked Questions (FAQ)
Q1: What is the difference between a single-row and three-row roller slewing ring for cranes?
-
A: A single-row four-point contact ball bearing is lighter and suitable for medium loads and compact designs. A three-row roller bearing offers the highest load capacity and rigidity, making it ideal for very large cranes (like crawler or wind turbine installation cranes) where stability is paramount.
Q2: How often should the crane slewing ring be lubricated?
-
A: Generally, we recommend lubricating the slewing ring every 100 operating hours or at least once every 3 months. However, in harsh environments (high dust or humidity), the frequency should be increased. Always purge old grease until fresh grease appears at the seal lip.
Q3: Can you manufacture a replacement for a Rothe Erde or FAG bearing?
-
A: Yes. ZZ specializes in manufacturing direct replacements for major international brands. As long as you provide the part number or dimension drawings, we can produce a fully interchangeable unit with equal or better performance.
Q4: Do you supply the mounting bolts?
-
A: While we focus on the bearing itself, we can supply high-strength mounting bolts (grade 10.9 or 12.9) as a complete kit upon request to ensure the safety of the installation.
