Structure and scope of slewing bearing
The slewing bearing is also a kind of bearing. The type distribution and structural characteristics of the slewing bearing are also very complicated. There are single row and cross type and roller type slewing bearings. At the same time, to a large extent, The uniform applicability of the slewing ring in various application areas is determined.
The slewing bearing specifically includes the above seven types of bearings:
- Single row four-point contact ball type slewing bearing;
- Double row reducer ball type slewing bearing;
- Single row cross roller type slewing bearing;
- Row roller type slewing bearing;
- Light series slewing bearing;
- Single row four-point contact ball type slewing bearing;
- Single row cross roller type slewing bearing.
Slewing bearings for different types of bearings:
Single row four point contact ball slewing ring
The single-row four-point contact ball slewing ring consists of two races. It is compact and lightweight. The steel ball is in contact with the arc track at four points and can withstand axial force, radial force and tipping moment. Construction machinery such as rotary conveyors, welding operators, small and medium-sized cranes and excavators are available.
Double row reducer ball slewing bearing
The double volleyball slewing bearing has three races. The steel ball and the spacer block can be directly discharged into the upper and lower raceways. According to the force condition, two rows of steel balls with different diameters are arranged. This open assembly is very convenient, the upper and lower circular races have a bearing angle of 90° and can withstand large axial forces and tipping moments. When the radial force is greater than 0.1 times the axial force, the raceway must be specially designed. The double-row and different-diameter spherical slewing bearings have relatively large axial and radial dimensions and are structurally fastened. It is especially suitable for loading and unloading machines such as tower cranes and truck cranes that require medium and large diameters.
Single row cross roller slewing ring
Single row cross roller type slewing ring consists of two races. It is compact in structure, light in weight, high in manufacturing precision, small in assembly clearance, high in installation accuracy, and 1:1 cross-arrangement of rollers. Force, tipping moment and large radial force are widely used in lifting and transportation, construction machinery and military products.
Three row roller slewing bearing
The three-row roller type slewing bearing has three races, and the upper and lower and the radial raceways are separated, so that the load of each row of rollers can be accurately determined. It can withstand various loads at the same time. It is the most load-bearing type among the four products. It has large shaft and radial dimensions and is firm in structure. It is especially suitable for heavy machinery requiring large diameter, such as bucket wheel excavator and wheel. Cranes, marine cranes, port cranes, steel run tables and large tonnage truck cranes.
Light series slewing ring
The lightweight slewing bearing has the same structure as the ordinary slewing bearing, and is light in weight and flexible in rotation. Widely used in food machinery, filling machinery, environmental protection machinery and other fields.
Single row four point contact ball slewing ring
The single-row four-point contact ball slewing ring consists of two races, which is compact and has four points of contact between the steel ball and the circular raceway. It is mainly used in machinery such as truck cranes, tower cranes, excavators, pile drivers, engineering work vehicles, radar scanning equipment, etc., which are subjected to tipping moment, vertical axial force and horizontal tendency force.
Single row cross roller slewing ring
Single row cross roller type slewing ring, consisting of two races, compact structure, high manufacturing precision, small assembly clearance, high requirements for installation accuracy, roller 1:1 cross arrangement, can simultaneously withstand axial force, tilt Rolling torque and large radial forces are widely used in transportation, construction machinery and military products.
There are different types of slewing bearings, and among these types, there are also different structural features. As a result, this also largely determines the importance of slewing bearings in different fields.
Ten of slewing bearing application industry
1. Solar power generation industry
In the solar power generation system, the solar panel assembly needs to follow the movement of the sun position to rotate up and down, left and right to ensure higher power generation.2. Wind power industry
The wind power generation system is in a harsh environment, with many dusts, strong corrosiveness, large temperature difference, and difficult maintenance. The bearing life is required to be more than 20 years.
Bearing applications: yaw bearing (slewing bearing), pitch bearing (slewing bearing), generator bearing (cylindrical roller bearing, angular contact ball bearing), gearbox bearing (cylindrical roller bearing, deep groove ball bearing), Spindle bearings (centrifugal roller bearings), etc.
3. Mining machinery industry
The working environment of mining machinery is harsh, dust is heavy, load is heavy, impact is large, and bearings are easily damaged. Bearing applications: slewing bearings, double row cylindrical roller bearings, thrust cylindrical roller bearings, thrust tapered roller bearings.
4. Construction machinery industry
Construction machinery includes cranes, excavators, bulldozers, road rollers, earth moving machines, etc. The working environment of construction machinery is harsh, dust is heavy, the load is heavy, the mechanical faults are many, and the working time is long.
Bearing applications: slewing bearings, deep groove ball bearings, cylindrical roller bearings, spherical roller bearings, tapered roller bearings.
5. Metallurgical industry
Metallurgical machinery has rolling mills, continuous casting machines, etc. Its operating conditions are high speed, high load and high temperature, which puts high requirements on the application difficulty of bearings.
Bearing applications: single row, double row, four row tapered roller bearings and cylindrical roller bearings
6. Machine tool industry
Machine tools are moving in the direction of high speed, high precision and high performance.
Bearing applications: full complement cylindrical roller bearings, deep groove ball bearings, angular contact ball bearings, cylindrical roller bearings, tapered roller bearings, thrust ball bearings and thrust cylindrical roller bearings
7. Medical industry
With the improvement of quality of life, medical, environmental, rehabilitation and fitness equipment are becoming more widespread. It requires a small noise and smooth operation.
Bearing applications: slewing bearings, deep groove ball bearings, angular contact ball bearings, cylindrical roller bearings and tapered roller bearings
8. Plastic industry
Die casting machines used in the plastics industry to press plastic finished products are extremely load-bearing and require long-lasting continuous operation.
Bearing application: tandem bearing
9. Petroleum industry
Drilling equipment used in the petroleum industry includes mud pumps, winches, top drives, and cranes. Working conditions: heavy load, many sediments, strong corrosiveness and large impact vibration.
Bearing applications: deep groove ball bearings, spherical roller bearings, cylindrical roller bearings, tapered roller bearings, thrust cylindrical roller bearings.
10. Port ship industry
The gantry cranes, vertical cranes and ship cranes used in the port are all working in the open air. The bearing conditions are heavy, corrosive and difficult to lubricate.
Bearing applications: slewing bearings, full complement cylindrical roller bearings, roller bearings.
