Tower Crane Slewing Ring

Tower Crane Slewing Ring is a key component connecting the tower body and the crane boom, made of high-strength steel, with built-in raceways and rolling elements (steel balls or rollers) to support the 360-degree smooth rotation of the crane superstructure. It is designed to withstand axial force, radial force and overturning moment to ensure the stability and safety of high-altitude work. With wear-resistant and impact-resistant characteristics, and equipped with a lubrication system to reduce friction loss, it is widely used in heavy lifting projects such as buildings and bridges, and is the core component of the efficient operation of tower cranes.

1. Excellent bearing capacity to ensure the stability of heavy-load rotation

The slewing ring adopts a single-row four-point contact ball structure, and the raceway is carburized and quenched (surface hardness HRC58-62, core hardness HRC30-35) to ensure that the raceway has no indentation and no deformation under dynamic load.

Key figures:

Axial load rating: 1,200 tonnes

Radial rated load: 800 tons

Anti-overturning torque: 15,000 kN·m (TUV certified)

Key Benefits:

It supports the smooth rotation of heavy lifting (such as bridge segments, wind turbine blades) and avoids the risk of jamming caused by insufficient load.

Passed the 2x ultimate load test (1 hour without abnormality at 2,400 tons of axial load) to ensure safety under extreme working conditions.

2. Precision gear processing to improve transmission efficiency

The external ring gear of the slewing ring adopts the grinding process (accuracy class ISO 1328-1 6), the tooth surface roughness is ≤ Ra1.2μm, and the tooth profile modification technology significantly reduces the gear meshing noise and wear.

Key figures:

Transmission efficiency: ≥98% (8% improvement compared with traditional gear milling process)

Gear life: ≥ 1,000,000 full-load slewing cycles

Key Benefits:

Reduce the energy consumption of the drive motor, and save more than 35,000 yuan in electricity costs per year (calculated based on an average of 10 hours of operation per day).

Avoid transmission failure caused by tooth surface pitting and reduce the risk of sudden downtime.

3. Sealing and lubrication system to prolong service life

The triple seal design (radial lip seal + axial labyrinth seal + dustproof steel cover) is adopted, and the automatic lubrication interface is used to ensure that the internal raceway and gear are in the best lubrication state for a long time.

Innovative Design:

Centralized lubrication channel: 6 grease nozzles are preset, and the whole cycle is lubricated within 5 minutes.

Grease residue monitoring: Real-time observation of grease status through a transparent window.

Key Benefits:

Maintenance intervals extended to 1,500 hours (every 500 hours for conventional structures).

Prevent the intrusion of dust and water vapor, and adapt to high-pollution environments such as mines and coasts.

4. Modular pre-assembly design reduces installation complexity

Slewing rings are provided with factory settings for pre-leveling backlash (axial clearance 0.08-0.12mm) and are equipped with high-precision mounting positioning holes as standard to ensure seamless docking with the tower crane base.

Key figures:

Mounting hole position tolerance: ±0.05mm (laser calibration)

On-site installation time: ≤4 hours (8-12 hours for traditional products)

Benefits for you:

Reduce the difficulty of high-altitude installation and commissioning, and reduce labor costs by 30%.

Pre-installed anti-loosening marked bolts to avoid the risk of eccentric load caused by loose bolts.

5. Intelligent health monitoring (optional)

Embedded sensors are integrated to collect slewing ring operation data in real time and synchronize it to the cloud platform for predictive maintenance.

Monitoring Functions:

Load distribution analysis: 12 strain gauges are used to monitor raceway pressure equalization.

Vibration spectrum detection: Identify early bearing damage (sensitivity 0.1mm/s).

Abnormal temperature warning: the raceway temperature exceeds 75°C and will automatically alarm.

Key Benefits:

Predict failures 2-3 months in advance to reduce unplanned downtime losses.

Data reports are compliant with the ISO 10816 vibration standard for equipment management certification.

6. Adaptability to harsh environments

Tested in extreme environments to ensure reliable operation worldwide:

Low temperature resistance: Toughness at -40°C (Charpy impact test).

Anti-corrosion ability: The surface is sprayed with zinc-aluminum coating + epoxy sealing paint, and it has passed the 1,500-hour neutral salt spray test (ASTM B117).

Seismic design: withstands 0.3g seismic acceleration (IEC 61373 compliant).

Construction of super high-rise buildings: The gear grinding process improves the life of the gear to 1 million cycles, and solves the problem of rapid gear wear caused by frequent rotation

Port container lifting: triple seal + zinc-aluminum coating, anti-corrosion life ≥ 15 years, effectively reducing the sealing failure caused by salt spray corrosion

Wind power tower installation: the depth of the hardened layer of the raceway is 3mm, and the compressive strength is increased by 40%, which solves the problem of local overload of the raceway caused by eccentric load.

24-hour technical hotline (Chinese/English)

Customized spare parts in case of emergency, direct delivery (including customs pre-clearance service)

Contact us now to provide you with exclusive solutions and exclusive prices for tower cranes and tower crane accessories.

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