What is the basic structure and maintenance method of the slewing bearing？

Slewing bearing Basic structure

Slewing bearings are usually composed of components such as worms, rotary bearings, shells, motors, etc. Due to the use of rotary bearings as the core components, they can simultaneously withstand axial force, radial force, and overturning torque. There are many forms, but the structural composition is basically the same.

Basic structure of slewing bearings

From left to right are (upper part):

1. Outer ring (with or without teeth)

2. Sealing tape

3. Rolling element (ball or roller)

4. Fuel nozzle

From left to right are (lower part):

1. Blockage

2. Blocking pin

3. Inner ring (with or without teeth)

4. Isolation block or cage

5. Installation hole (wire hole or light hole)

Slewing bearing application

Rotary bearings are widely used, and engineering machinery is the first and most widely used place for rotary bearings, such as earthwork machinery, excavators, dismantling machines, stacker reclaimers, graders, road rollers, dynamic compactors, rock drilling machinery, tunneling machines, etc.

Other types include concrete machinery: concrete pump truck, concrete mixing and distribution rod integrated machine, and belt type distribution machine

Feeding machinery: disc feeder, sand mixer

Lifting machinery: wheel crane, crawler crane, gantry crane, tower crane, fork lift crane, trailing crane, gantry crane

Foundation treatment machinery: impact reverse circulation drilling rig, rotary drilling rig, impact rotary drilling rig, rotary excavation drilling rig, reverse circulation rotary drilling rig, positive circulation rotary drilling rig, long spiral engineering drilling rig, submersible engineering drilling rig, static pressure pile machine, pile driver

Engineering vessel: dredger

Special vehicles: bridge inspection vehicles, fire trucks, window cleaning machines, flat beam transport vehicles, aerial work vehicles, self-propelled aerial work platforms

Light industrial machinery: beverage machinery, bottle blowing machines, packaging machinery, filling machines, rotary bottle sorting machines, injection molding machines, marine cranes.

The slewing bearing is an indispensable transmission device in the excavator slewing system. Users who have used the slewing bearing should be aware that after a period of use of the bearing, there will be certain wear and loss. 

The main reasons for the wear of the excavator slewing bearing are:

1. When purchasing a slewing bearing, the model matching is incorrect. When docking the tooling, there may be speed mismatch and excessive load, resulting in wear of the inner and outer teeth;

2. The design and material selection of the slewing bearing for the tooling model can lead to accelerated wear of the slewing bearing if not selected properly

Below, the editor will introduce the maintenance and upkeep methods of the slewing bearing to everyone

1. Regularly check the pre tightening force of the slewing bearing bolts. The slewing bearing is used for 100-500 hours, which is a working cycle. After the equipment is shut down, the bolt pre tightening torque should be checked one by one. After a period of running in, every 1000 hours is a working cycle, and the machine is stopped to check the bolt pre tightening force.

2. When using the slewing bearing, attention should be paid to changes in operating noise. If there is noise during operation, it should be immediately disassembled and inspected to eliminate faults;

When pre tightening the nut, evenly apply lubricating oil between the bolt and nut, and tighten it multiple times clockwise with a matching wrench.

When storing slewing bearings in inventory, they should be horizontally lifted and stacked for storage. Do not lift vertically to prevent deformation of the rolling ring;

5. The bolts and nuts used in the slewing bearing should be selected according to the load-bearing curve of the slewing bearing bolts. During installation, tighten the double nuts to prevent loosening.

6. Four oil cups are distributed on the inner and outer gear rings of the slewing bearing, and lubricating grease is added to the inside of the raceway from the oil cups. Under the guidance of the staff, every 50 hours is a cycle for the slewing bearing, and every time the lubricating grease is added, it must be fully added until there is oil leakage from the sealing area visually.

Precision slewing bearings supplier

LTZC  slewing bearings, providing a series of services such as research and development, design, production, and sales of slewing bearing products.

If you are looking for slewing bearings supplier, please contact us for the latest quotation.