The slewing bearing device was mainly used for excavators and cranes in the early stage, and then gradually developed to other machines. It is similar to an oversized rolling bearing. When the slewing is applied to the crawler excavator, the upper half and the lower half can be connected, and the weight and load of the upper half can be supported so that it can rotate. Rotary applications include: lifting machinery, engineering machinery, transport machinery, metallurgical machinery, food processing machinery, medical machinery.

The bearing slewing ring also has rolling elements and rolling rings. Compared with ordinary bearings, it has:

(1) the general size of the slewing bearing is larger, the diameter is 0.4~10m.

(2) Under normal circumstances, the slewing bearing should bear axial, radial and large overturning moment loads at the same time.

(3) The operating speed of the slewing bearing is usually below 10 r/min. And in most cases can not be continuous rotation, the role is similar to the "swing bearing".

(4) slewing bearing in the manufacturing process, material processing and other aspects of higher requirements.

(5) Slewing bearings are usually equipped with tooth profile diagrams and dust-proof sealing devices.

(6) Slewing bearings usually need to be fastened to the upper and lower brackets with screws.

In the past, cranes, excavators and other construction machinery mainly used column slewing bearings. Including rotary column type slewing bearing, fixed column type slewing bearing and rotary type slewing bearing. These have been replaced by new rolling bearings slewing bearings. Its main advantages are:

(1) the rotation resistance is small, the operation is light and flexible,

(2) The structure is more compact, and the height and size are smaller.

(3) The maintenance is relatively convenient and the service life is prolonged.

(4) Gear rings, seals and screws, etc. It is convenient for specialized and centralized production.

(5) The middle space can be used to install other components.

The support rollers are usually separated by nylon spacers. This structure can maintain the stability of the movement, and the price is low, widely used. Special applications require the use of special ball or roller spacers, such as copper, aluminum, etc., which can withstand high temperatures and isolate quickly. Generally, bearings installed on horizontal shafts or continuously rotating generators, as well as slewing bearings used in occasions with high positioning and reliability requirements, can use a strip combination cage to keep the rolling elements in the correct circumferential position. High reliability.

Causes and solutions of fever caused by rotary structure factors:

1. The shaft size of the slewing bearing is too large, so the bearing will be very tight. Solution: Provide appropriate clearance for the shaft and prohibit over-tightening.

2. The slewing bearing seat is coated with too much grease or the oil level is too high. Solution: The slewing bearing will remove excess grease through the sealing hole, and oil lubrication will reduce the oil level to just below the bearing housing.

3. The friction between the inner ring and the sealing ring will generate heat. Solution: Stop the machine at this time to check the clamping ring screw to ensure that the inner ring is firmly connected to the shaft, the free end bearing is installed correctly, and the roller is aligned with the center line of the outer ring.