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A slewing bearing, slew[ing] ring, or turntable bearing is a rotational rolling-element bearing that typically supports heavy, slow-turning, or slowly-oscillating loads in combination. Slewing bearings are often used in horizontal platforms, such as conventional cranes, swing yarders, amusement rides, and wind-facing platforms of horizontal-axis wind turbines.In other orientations (e.g. a horizontal axis of rotation), they are used in materials handling grapples, forklift attachments, and welding turnover jigs.
|
Name |
Slewing Ring Bearings |
Type |
Single Ball Ring |
|
Material |
42CrMo |
Output Torque |
15.6KN.m |
|
Tilting Moment Torque |
67.8KN.m |
Holding Torque |
48K N.m |
|
Static Axial Rating |
555KN |
Static Radial Rating |
222KN |
|
Dynamic Axial Rating |
114KN |
Dynamic Radial Rating |
100KN |
|
Gear Ratio |
85:1 |
Ourter Dia. |
420mm |
Improved Traction: Track shoes improve traction on a variety of surfaces, including mud, gravel and rocky ground. The grousers dig into the earth, helping the machine avoid slippage and making it easier to operate in challenging environments.
Smoother Turning Capabilities: Double grousers can particularly help the machine make smoother turns on different terrain types.
Even Weight Distribution: The design of track shoes allows for the even distribution of the machine’s weight across the surface. This is especially important on soft ground, where concentrated weight could cause the machine to sink.
Protection for Tracks and Other Components: Track shoes serve as the first point of contact with the ground, which means they take the majority of the wear and tear that would otherwise affect the tracks. This helps prolong the life of the entire undercarriage, saving you money on costly repairs or replacements.
High load-bearing capacity:
Due to its large contact area, slew plate bearings can withstand larger loads and are suitable for applications requiring high load-bearing capacity.
High precision:
Due to their sophisticated design, slew plate bearings are usually able to maintain high rotation accuracy and stability, and are suitable for applications requiring high precision.
Strong adaptability:
Slewing bearings can work in various harsh and extreme environmental conditions, such as high temperature, low temperature, high humidity and corrosive substances.
Easy to maintain:
Slew plate bearings are usually equipped with lubrication systems and sealing devices for easy maintenance and care.
The three-row roller slewing bearing has three separate upper and lower races and radial raceways, so that the load of each row of rollers can be accurately determined and can bear various loads at the same time. It has the largest bearing capacity among the four products, and the shaft and radial dimensions are large and the structure is firm.
The double row slewing bearing has three races, and the steel balls and spacers can be directly discharged into the upper and lower raceways. According to the stress conditions, two rows of steel balls with different diameters are arranged. This kind of open assembly is very convenient, and the bearing angle of the upper and lower arc raceways is 90°, which can bear a large axial force and tipping moment. When the radial force is greater than 0.1 times the axial force, the raceway must be specially designed.
The single cross roller slewing bearing consists of two races, with compact structure, light weight, high manufacturing precision, small assembly clearance, and high requirements for installation precision. The rollers are arranged in a 1:1 cross. It can withstand axial force, large radial force and tipping moment at the same time, and is widely used in lifting transportation, construction machinery and military products.
The single-row four point contact ball slewing bearing is composed of two races, with compact structure, light weight, four-point contact between the steel ball and the arc raceway, and can bear axial force, radial force and tipping moment at the same time. It can be used in construction machinery such as slew conveyors, welding operators, small and medium-sized cranes and excavators.
Cranes and Excavators: Crane and excavator slewing bearings allow for the 360-degree rotation of heavy machinery, enabling efficient operation in construction and mining.
Wind Turbines: In the renewable energy industry, slewing bearings enable wind turbine blades and nacelles to rotate, maximizing their exposure to the wind for optimal efficiency. These applications often use slew drives to ensure smooth and reliable rotation.
Medical Equipment: In medical imaging devices like CT scanners, slewing bearings ensure precise and smooth rotation for accurate diagnostics.
Robotics and Industrial Machinery: These bearings play a crucial role in ensuring the precise and smooth operation of robotic arms and various automated machines. Some advanced medical equipment may also integrate a slew drive for enhanced control and precision.
Inner and Outer Rings: The core of the bearing's design, the inner ring is attached to the moving component, and the outer ring is fixed to a stationary framework. This setup makes sure everything works together perfectly.
Rolling Elements (Balls or Rollers): Rolling elements, whether they're balls or rollers, let the bearing's inner ring spin effortlessly against the outer one. This smooth movement greatly reduce friction and wear for more efficient machinery performance. Cylindrical roller slew ring bearings use cylindrical rollers as rolling elements, providing high load capacity and efficient load distribution. Flange slew ring bearings feature an integrated flange on the outer ring.
Spacers/Cages: Spacers or cages expertly guide and evenly space the rolling elements, like balls or rollers. They make sure these parts are evenly spaced out without touching each other during assembly or maintenance, contributing to the bearing's longevity and reliability.
Seals: Seals act like little shields for the bearings, keeping out contaminants like dust, dirt, and water. They also retain the oil or grease that helps the bearing move smoothly. By doing this, seals reduce the wear and tear on the bearing, which helps it last longer and sustain efficient performance.
Mounting Holes: Mounting holes play a big role in attaching bearings to machinery. They ensure bearings are lined up just right, stay in p lace steadily, and share the weight evenly. This enhances the machine's performance, minimizes vibrations, extends the bearing's lifespan, and boosts overall functional efficiency and safety.
Optional Gears: Integrated gears in slewing bearings enable powered rotation and precise control, facilitating movement. They mesh with external gear mechanisms to provide the necessary torque, enabling complex operations in machinery and equipment across various industries. Some slewing bearings also feature an external gear on the outer ring, which can be directly engaged with a motor or drive system, further enhancing their versatility.
The motion of the rotating ring
The rotating ring in the slew bearing maintains close contact with the outer ring through the balls or rollers inside the bearing, thereby forming continuous friction. These balls or rollers support the rotating ring and keep it stable as it rotates under the power of an external drive.
load transfer
The design of slew bearings allows load transfer in all directions. This means that no matter which direction the load comes from, the slew bearing is able to effectively distribute it to various contact points, ensuring uniform load distribution. This characteristic makes slew bearings ideal for many industrial applications.
Accuracy maintained
Because slew bearings have large contact areas and high rotational accuracy, they are generally able to remain stable at high rotational speeds. In addition, by precisely controlling the lubrication system and adjusting the sealing device, it is also possible to ensure that the bearing maintains its accuracy and stability during long-term use.
Rolling Elements
The rolling of the slewing ring is usually made of bearing steel grade GCr15 or GCr15SiMn;
Inner and Outer Ring
The rings are made of surface hardened steel 42CrMo or 50Mn;If the host or the working environment has special requirements, it can also be made of 440C, 420C and other stainless steel or other grades of 45 steel.
Spacer
As a leading slewing bearing supplier, THB slewing rings have different types of cages, such as isolation block type, integral cage and segmented cage, which are suitable for different working conditions.
Seals
THB slewing ring seals are made of oil-resistant nitrile rubber.For applications requiring higher minimum and maximum temperatures, we can use fluoroelastomer seals or other special sealing materials.
Load requirements: Evaluate the axial, radial, and moment loads the bearing may face during operation.
Operating environment: Select a bearing designed to withstand specific working conditions, such as temperature, humidity, and exposure to dust or chemicals.
Gear type: Choices include internal, external, or no gear, depending on application requirements.
Bearing size: Depending on available space and load requirements, choose an appropriate diameter.
Bearing type: Select from single-row or double-row ball bearings, single-, double-, or triple-row roller bearings, or a combination of roller-ball bearings, considering load capacity and rigidity requirements.
Material: Assess the specific requirements and operating environments to select suitable material for bearing components, such as high-strength steel or corrosion-resistant alloys.
Lubrication: Evaluate the lubrication requirements for the application— grease or oil lubrication— And ensure proper sealing to prolong bearing life and maintain optimal performance.
Lubrication
Using the correct lubricant is essential to reducing friction and preventing wear. Follow the manufacturer’s recommendations for regularly adding the appropriate lubricant (oil or grease) to ensure full lubrication. Bearings operating in high-temperature environments may require special lubricants that can withstand heat without degradation.How to lubricate bearings?
Handling and Storage
Before installation, slew bearings should be stored in a clean, dry environment to prevent contamination and rust. Improper storage, such as in a damp warehouse, can cause corrosion and early failure.
Installation Accuracy
Precise alignment during installation is critical to ensure the bearing functions as intended. Improper alignment can lead to uneven loading, causing uneven wear or failure. For instance, when installing slew bearings in wind turbines, precise calibration ensures smooth nacelle rotation with minimal resistance.
Regular Inspections
Periodically inspect the appearance of the bearing during use, checking for cracks, wear, or corrosion. Also, listen for unusual noises during operation. Timely detection of issues can reduce downtime and maintenance costs.
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Swing Frame for excavator, Swing rack for excavator, Swing Shaft for Excavator(0/10)
