Slew bearing crane

Drive industry development

ZZ products are applied globally in solar tracking systems, wind power systems, satellite communications, and numerous other globally connected industries.

A slew bearing crane uses a slewing bearing to enable the rotation of its superstructure, allowing it to swing loads around a central axis. Key components include the slewing bearing, superstructure, hydraulic/electric motor, boom/jib, and control systems.

Components:

Slewing Bearing: Central to the crane’s rotation, handling axial, radial, and tilting loads.
Superstructure: Rotating part housing the boom, jib, and cab.
Hydraulic/Electric Motor: Powers the rotation.
Boom/Jib: Extendable arm for lifting loads.
Control Systems: Enable precise movement.

Functions and Advantages:

Rotation: 360-degree movement for efficient load positioning.
Lifting and Lowering: Precise handling of heavy loads.
Load Handling: Manages substantial weights, ensuring stability.

Applications:

Construction: Tower, mobile, and crawler cranes.
Shipping and Ports: Container cranes.
Industrial: Overhead and gantry cranes.

Slew bearing cranes are versatile, high-capacity, and precise, essential for various industrial and construction tasks.

Frequently Asked Questions

Expert Insights and Reliable Solutions to Your Most Common Questions.

1. What types of slewing bearings does ZZ Slewing Bearing provide?

ZZ Slewing Bearing supplies a full range of slewing bearings to meet different industrial needs:

Single row four point contact slewing bearings Application: medium loads, precise rotation.
Double row ball bearings Application: higher radial and axial loads.
Cross roller bearings –Application: high rigidity, suitable for robots and machining centers.
Three row roller bearings – Application: extreme loads in heavy equipment.
Ball combine roller bearings –Application: precise rotational adjustment applications.
Customized bearings – tailored for specific equipment requirements.

2. How do I choose the right bearing for my application?

Typical selection parameter for ZZ clients:

Load type: axial, radial, and tilting moment.

Rotation RPM: ensures long service life.

Installation space & mounting dimensions: inner/outer ring diameter, bolt circle.

Precision & rigidity requirements: critical for cranes, excavators, and robots.

ZZ engineers provide professional selection guidance according to your equipment and drawings.

3. What materials does ZZ Slewing Bearing use for slewing bearings?

ZZ Slewing Bearing selects materials for strength, wear resistance, and long-term durability:

Slewing ring: 42CrMo, 50Mn, C45N, 40CrNiMo, C48E.

Special forging spare parts: carburized/hardened steels for gear teeth (20CrMnTi, 18CrNiMo7‑6).

Corrosion resistant: SS 304, 316L, duplex stainless steel.

Surface treatments: heat treatment, quenching, carburizing, induction hardening, and surface coating(Four-Layer Packing, Strong Anti-Rust Oil, Black Oxide Treatment, Jet Black Paint Finish, Hot-Dip Galvanizing (CGL), Electro-Galvanizing (EGL), Hot-Dip Galvanizing + Paint Finish)

4. How can ZZ Slewing Bearing achieve maximum service life?

Correct installation with flat surfaces.

Proper lubrication using grease.

Avoid overloading or shock loads over capacity.

Monitor operating conditions regularly to prevent debris entry.

5. What causes abnormal noise or vibration in bearings?

Typical factors observed by ZZ engineers: