The slewing bearing, also known as the slewing ring bearing, is a very large bearing capable of withstanding the combined load, and can withstand large axial, radial loads and overturning moments at the same time. Mainly used in large-scale mechanical equipment, such as some cranes and excavators and other equipment. The basic structure of the slewing bearing is similar to the common bearing, but in order to adapt to the more complicated environment, the structure of the slewing bearing is mainly composed of the mounting hole, the internal gear or the external gear, the lubricating oil hole and the sealing device. The design is compact, easy to guide and easy to maintain.
1.The working principle of the slewing bearing
The working principle of the slewing bearing is very simple, mainly the way of moving the object to slide and reduce the frictional resistance. Specifically, the slewing bearing mainly relies on lubrication and friction to achieve the purpose of operation. Internally, it relies on the mutual friction between the ball and the steel ring for the purpose of operation. On the outside, it also relies on the frictional force of the slewing bearing and other components to start the operation and rub against each other, thus driving the object to operate. Of course, there is still not enough light to rub. Although it relies on friction to operate, lubrication is also essential. Just like the chain of bicycles, it takes a long time, and the friction is too large, which will affect the use of parts. Therefore, after using this kind of bearing segment time, it is necessary to carry out maintenance in time and brush some lubricating oil to ensure that it can be in a suitable environment.
2.The working mode of the slewing bearing
The slewing bearing has four series of four-point contact ball bearings, double-row angular contact ball bearings, crossed roller bearings, crossed tapered roller bearings and three rows of roller composite bearings. Four point contact ball bearings have high static Load capacity; cross cylindrical roller has high dynamic load capacity; pre-interference of crossed tapered roller bearing can make bearing have greater support rigidity and rotation precision. Three row roller slewing bearing is promoted due to the increase of bearing capacity. To the bearing height, the various forces are respectively subjected to different raceways, so the bearing diameter can be greatly reduced under the same force condition, and thus has a high load carrying capacity.
2.1. Point contact rolling working mode of slewing bearing
The point contact rolling principle of the slewing bearing is mainly used for the four point contact ball slewing bearing and the cross roller slewing bearing. This working principle has a higher requirement on the quality of the steel ball for the combination of the point contact radial axial force, and the track has a uniform angle.
2.2. Surface contact rolling combined working mode of slewing bearing
The surface contact rolling combination working principle of the slewing bearing is mainly used for the three-row roller slewing bearing. Its advantage is that the contact surface is large and the bearing force is evenly rolling and flexible.
2.3. The surface contact of the slewing bearing is combined with the rolling type
The surface contact rolling combined working principle of the slewing bearing is mainly used for the rotary table bearing. Now the new slewing bearing has a compact structure and high precision. Therefore, the surface contact rolling and sliding working mode is suitable.
2.4. The slewing bearing rolling combination scrolling working mode
The rolling combined rolling principle of the slewing bearing is mainly used for the combined ball and column slewing bearing. This principle has the advantages of small eccentricity, long service life and double structure of roller and ball.
The above is the introduction of the working principle and working mode of the slewing bearing. The principle of the slewing bearing is mainly to realize the rotation of the mechanical equipment through the friction. Due to its good performance, slewing bearings are widely used in large-scale rotary devices such as lifting machinery, mining machinery, construction machinery, port machinery, ship machinery and high-precision radar machinery and missile launchers. At the same time, we can design, develop and produce various special structure slewing bearings according to the specific requirements of users.