The Role of Slewing Bearings in Excavators

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Among the numerous key components of an excavator, the slewing bearing plays an extremely important role. It is involved in every operation process of the excavator, and its function is irreplaceable, from basic motion realization to overall performance improvement.

What is Slewing Bearing?

The slewing bearing is a large – scale bearing that can withstand comprehensive loads and is used to support and enable relative rotation between mechanical components. It generally consists of an inner ring, an outer ring, rolling elements, and a cage. Slewing bearings can simultaneously bear axial forces, radial forces, and overturning moments. They are widely used in large – scale machinery such as cranes, excavators, and wind turbines. In cranes, it enables the boom to rotate smoothly for accurate lifting and handling of goods; in wind turbines, it allows the nacelle to flexibly align with the wind direction. With its stable and flexible rotation characteristics, the slewing bearing ensures the normal operation of equipment, improves work efficiency and reliability, and is an indispensable key component in large – scale machinery.

The Importance of Slewing Bearings

The slewing bearing is the core component that enables the upper structure of the excavator to rotate. It connects the upper part of the excavator (including the cab, engine, hydraulic system, etc.) and the lower part (chassis, crawler, etc.). Thanks to the slewing bearing, the upper part of the excavator can freely rotate 360 degrees relative to the lower part. This function allows the excavator to flexibly adjust the direction of its working device (boom, arm, bucket) during operation, thus easily coping with excavation tasks in different positions. For example, in a narrow construction site, the excavator can quickly rotate its body with the help of the slewing bearing and accurately extend the bucket to the area that needs to be excavated, greatly improving work efficiency.

In terms of load – bearing capacity, the slewing bearing bears a huge load. When the excavator is working, the weight of the upper part, together with the impact force and inertial force generated during material excavation, all act on the slewing bearing. The slewing bearing must have sufficient strength and rigidity to stably bear these loads. When excavating hard rocks or grabbing heavy materials, a large overturning moment is generated, and the slewing bearing can effectively resist this moment, preventing the upper structure of the excavator from tilting or overturning and ensuring the safety and stability of the equipment during operation. If the load – bearing capacity of the slewing bearing is insufficient, it may lead to premature damage, affecting the normal use of the excavator and even causing safety accidents.

The slewing bearing also has a significant impact on the operating accuracy of the excavator. When performing fine – grained excavation, site leveling, and other operations, the working device of the excavator needs to be accurately positioned and operated. The high – precision rotation performance of the slewing bearing can ensure the accuracy and stability of the working device during rotation. With high manufacturing precision, the slewing bearing has a small clearance between the rolling elements and the raceways, which can effectively reduce shaking and deviation during rotation. In this way, when the excavator is excavating, it can more accurately control the position and angle of the bucket, achieving precise control of the excavation depth and flatness to meet various construction requirements.

The slewing bearing also affects the working efficiency of the excavator to a certain extent. Since it can achieve fast and flexible rotation, it makes the conversion between different working positions of the excavator more convenient. After filling a bucket with materials, the excavator can quickly rotate its body to unload the materials at the designated location and then quickly return to continue excavation, reducing the operation cycle time. In large – scale earthwork projects, such an efficient operation cycle can significantly improve the overall construction progress. At the same time, the excellent performance of the slewing bearing also reduces the failure rate of the equipment, shortens the maintenance time and cost, and further improves the working efficiency of the excavator.

In addition, the reliability and durability of the slewing bearing are directly related to the service life of the excavator. Excavators usually operate in harsh working environments such as high temperatures, humidity, and dust. The slewing bearing needs to operate stably for a long time in such environments. High – quality slewing bearings are made of high – strength and corrosion – resistant materials, and through strict manufacturing processes and quality inspections, they have good wear – resistance and anti – fatigue performance. It can maintain stable performance during frequent rotation, reducing damage caused by wear, fatigue, etc., and extending the overall service life of the excavator.

With the continuous development of excavator technology, the performance requirements for slewing bearings are also getting higher and higher. Modern excavators are developing towards large – scale, intelligent, and high – efficiency directions, and slewing bearings are also constantly innovating and improving. New – type slewing bearings use advanced materials and manufacturing technologies to improve load – bearing capacity, rotation accuracy, and reliability. At the same time, some slewing bearings are also equipped with intelligent monitoring systems that can monitor their operating status in real – time, give early warnings of potential failures, and provide a basis for equipment maintenance and repair, further enhancing the overall performance of the excavator.

Prices of Slewing Bearings

There are many factors that affect the price of slewing bearings. Firstly, raw materials play a crucial role. High – quality steel has a high cost, and products made from it have excellent performance and long service life, so the price is also high. Secondly, slewing bearings with complex manufacturing processes and high – precision requirements need advanced equipment and strict quality control, which will also increase the price accordingly. Moreover, the larger and more special the size and specifications are, the greater the processing difficulty and material consumption, and the higher the price will be.

Suppliers of Slewing Bearings

In the field of slewing bearings, Ldb bearing company shines like a bright star globally with its outstanding quality and innovative capabilities. The product range of Ldb bearing company is extensive, with a processing diameter ranging from 150mm to 4000mm. Whether it is a standard – sized or non – standard slewing bearing, it can be manufactured with high quality to meet the diverse needs of different customers.

The Impact of Tilt on Slewing bearings

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In the operation of mechanical systems, there exists a complex and close – knit relationship between tilt and slewing bearings. Tilt can stem from various factors such as equipment installation errors, external forces during operation, and foundation settlement. It has a significant impact on the performance and lifespan of slewing bearings, as well as the stability of the entire mechanical system.

What is Slewing bearing?

The slewing bearing is a large – scale slewing bearing capable of withstanding comprehensive loads, which is used to support and enable relative rotation between mechanical components. It typically consists of an inner ring, an outer ring, rolling elements, and a cage. Slewing bearings can simultaneously bear axial forces, radial forces, and overturning moments. They are widely applied in large – scale machinery like cranes, excavators, and wind turbines. In cranes, slewing bearings allow the boom to rotate smoothly for accurate cargo lifting; in wind turbines, they enable the nacelle to align flexibly with the wind direction. Thanks to their stable and flexible rotation characteristics, slewing bearings ensure the normal operation of equipment, enhance work efficiency and reliability, and are indispensable key components in large – scale machinery.

The Adverse Effects of Tilt on Slewing bearings

The impact of tilt on slewing bearings is most prominently manifested in uneven load distribution. When mechanical components tilt, the load borne by the slewing bearing becomes unevenly distributed. Take automotive wheel hub slewing bearings as an example. If a vehicle drives on an uneven road and the body tilts, the pressure on different parts of the wheel hub slewing bearing will vary. The rolling elements that originally shared the load evenly will experience different levels of pressure, with some slewing bearing greater loads and others less. Over an extended period, the contact areas between the heavily – loaded rolling elements and the raceways will suffer from excessive wear, resulting in damage such as fatigue spalling and scratches on the surface, severely affecting the slewing bearing’s service life. Moreover, uneven load distribution increases the internal friction of the slewing bearing, generating more heat and further accelerating the slewing bearing’s aging and failure.

Tilt also alters the slewing bearing clearance. Clearance is a crucial parameter for the normal operation of slewing bearings. An appropriate clearance ensures that the rolling elements can roll freely and with a certain degree of flexibility during operation. When mechanical components tilt, the relative positions of the inner and outer rings of the slewing bearing change, thus changing the clearance. A reduced clearance may intensify the friction between the rolling elements and the raceways, and may even cause jamming. An increased clearance, on the other hand, will lead to a decline in the slewing bearing’s rotational accuracy, causing vibration and noise during the operation of the mechanical system. In the spindle slewing bearings of precision machine tools, even a slight change in clearance can affect the machining accuracy, resulting in dimensional deviations and increased surface roughness of the machined parts.

In addition, tilt increases the axial force on the slewing bearing. Under normal circumstances, the axial load – slewing bearing capacity of a slewing bearing is determined according to the design requirements. However, when the machine tilts, part of the original radial load may be converted into an axial load. For instance, when the nacelle of a wind turbine tilts under the action of strong winds, the slewing bearings in the nacelle will not only bear their own radial load but also an additional axial force caused by the tilt. If the axial load – slewing bearing capacity of the slewing bearing is insufficient, problems such as axial displacement and aggravated wear are likely to occur. In severe cases, it can lead to failures in the entire wind power generation system.

Optimization Measures

To counteract the adverse effects of tilt on slewing bearings, a series of targeted measures are necessary. During the equipment installation process, strict control over installation accuracy should be maintained. High – precision measuring tools and calibration methods should be employed to ensure the horizontal installation of the equipment, minimizing tilt caused by improper installation. For working environments where tilt is likely to occur, regular inspections and adjustments of the equipment should be carried out to detect and correct tilt problems promptly. When selecting slewing bearings, appropriate slewing bearing types should be chosen based on the equipment’s working conditions and potential tilt situations. For example, for equipment prone to tilt, self – aligning ball slewing bearings or self – aligning roller slewing bearings can be selected. These types of slewing bearings have an automatic self – aligning function, which can compensate for misalignment issues caused by tilt to a certain extent, ensuring the normal operation of the slewing bearings.

Furthermore, optimizing the structure and materials of the slewing bearing can enhance its resistance to tilt. Using high – strength and wear – resistant materials to manufacture the rolling elements and raceways of the slewing bearing can reduce wear caused by uneven loading and increased friction. In terms of structural design, measures such as increasing the slewing bearing’s load – slewing bearing area and improving the sealing structure can help improve the slewing bearing’s performance under tilted conditions. Additionally, by leveraging advanced monitoring technologies to monitor the slewing bearing’s operating status in real – time, including parameters such as temperature, vibration, and noise, maintenance and adjustments can be carried out promptly once abnormalities are detected, preventing the problem from worsening.

The relationship between tilt and slewing bearings has a far – reaching impact on the operation of mechanical systems. Understanding the various effects of tilt on slewing bearings and implementing effective countermeasures are crucial for ensuring the normal operation of slewing bearings, extending the service life of equipment, and enhancing the reliability and stability of mechanical systems. In all aspects of mechanical design, manufacturing, and use, the tilt factor should be fully considered, and attention should be paid to the performance changes of slewing bearings to ensure the safe and efficient operation of the entire mechanical system.

Prices of Slewing bearings

There are numerous factors influencing the prices of slewing bearings. Firstly, raw materials play a significant role. High – quality steel, with its high cost, can be used to manufacture products with excellent performance and long service life, thus commanding a high price. Secondly, slewing bearings with complex manufacturing processes and high – precision requirements necessitate advanced equipment and strict quality control, which will also drive up the price. Moreover, the larger and more specialized the size and specifications are, the greater the processing difficulty and material consumption, and consequently, the higher the price.

Suppliers of Slewing bearings

In the field of slewing bearings, Ldb bearing company stands out like a brilliant star, shining globally with its remarkable quality and innovative capabilities. Since its establishment in Luoyang, China’s slewing bearing production base, in 1999, through its profound heritage and unremitting efforts, it has become a leading enterprise in the industry. Ldb bearing company offers a wide range of products. Whether it’s standard – sized or non – standard slewing bearings, it can produce them with high quality to meet the diverse needs of different customers. Its products are widely used in multiple fields, a testament to its strong strength.

Slewing bearings for Offshore Engineering Equipment

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The anti – corrosion technology of slewing bearings for offshore engineering equipment are crucial for ensuring the smooth development of offshore resource exploitation. Through continuous technological research and development and innovative applications, these technologies will continue to be enhanced, providing support for the development of the offshore engineering industry.

What is Slewing bearing?

The slewing bearing is a large – scale slewing bearing that can withstand comprehensive loads and is used to support and enable relative rotation between mechanical components. It generally consists of an inner ring, an outer ring, rolling elements, and a cage. Slewing bearings can simultaneously bear axial forces, radial forces, and overturning moments and are widely used in large – scale machinery such as cranes, excavators, and wind turbines. In cranes, it enables the boom to rotate smoothly for precise lifting and handling of goods; in wind turbines, it allows the nacelle to flexibly align with the wind direction. With its stable and flexible rotation characteristics, the slewing bearing ensures the normal operation of equipment, improves work efficiency and reliability, and is an indispensable key component in large – scale machinery.

Severe Challenges of the Marine Environment to Slewing bearings

Corrosion Threat from High – Salinity Seawater

Seawater is rich in salts, and chloride ions among them are highly corrosive. When slewing bearings are immersed in seawater for a long time, chloride ions can penetrate the oxide film on the slewing bearing surface, triggering local corrosion such as pitting corrosion and crevice corrosion, gradually destroying the structural integrity of the slewing bearing and reducing its load – slewing bearing capacity and operating accuracy.

Accelerated Wear Caused by Sea Wind and Wave Impact

The strong sea winds and waves continuously impact offshore engineering equipment, subjecting the slewing bearings to frequent vibrations and impact loads. This not only increases the friction between internal parts of the slewing bearing but also leads to aggravated surface wear, shortening the slewing bearing’s service life and affecting the normal operation of the equipment.

Corrosion and Failures Caused by Marine Biofouling

Marine organisms tend to attach to the surface of slewing bearings, forming a biofilm. The oxygen – deficient environment under the biofilm accelerates the corrosion process of metals. Moreover, the metabolic products of some marine organisms are acidic, which can also corrode the slewing bearing material and may even cause the slewing bearing to jam, resulting in failures.

Research and Development Progress of Anti – Corrosion Technologies

Application of Special Alloy Materials

To improve the anti – corrosion performance of slewing bearings, researchers have developed various special alloy materials. For example, stainless steel alloys containing elements such as chromium, molybdenum, and nickel can form a dense passive film on the slewing bearing surface, effectively blocking the erosion of chloride ions. Some new nickel – based alloys have higher corrosion resistance and strength and perform outstandingly in slewing bearings for deep – sea equipment.

Innovation in Surface Coating Technologies

Surface coating technology is an important means to enhance the anti – corrosion ability of slewing bearings. Ceramic coatings, with their high hardness, chemical stability, and good corrosion resistance, have become a popular choice. By using technologies such as plasma spraying to coat ceramic coatings on the slewing bearing surface, the anti – seawater corrosion performance can be significantly improved. In addition, organic coatings such as epoxy resin coatings can also provide good protection for slewing bearings, preventing direct contact between seawater and the metal surface.

Breakthroughs in Wear – Resistant Technologies

Optimizing Material Hardness and Toughness

In terms of wear resistance, the hardness and toughness of slewing bearing materials are improved by optimizing their composition and heat treatment processes. For example, slewing bearing steel is processed by special quenching and tempering processes to obtain good comprehensive mechanical properties, enabling it to resist wear and withstand impact loads.

Application of Self – Lubricating Materials

The emergence of self – lubricating materials provides a new approach to solving slewing bearing wear problems. Adding solid lubricants such as molybdenum disulfide and graphite to slewing bearings can form a lubricating film on the friction surface, reducing the friction coefficient and wear. Some polymer – based self – lubricating composites have good anti – friction and wear – resistant properties and are widely used in slewing bearings for offshore engineering equipment.

Application Examples of Related Technologies

Slewing bearings for Deep – Sea Drilling Rigs

Deep – sea drilling rigs operate in harsh marine environments, and their slewing bearings need to have extremely high anti – corrosion and wear – resistant properties. Slewing bearings made of special alloy materials, combined with multi – layer surface coating protection, can effectively resist seawater corrosion. Meanwhile, the application of self – lubricating materials ensures that the slewing bearings can operate stably under high – load and low – speed conditions, reducing maintenance costs and improving the efficiency and safety of drilling operations.

Slewing bearings for Offshore Wind Turbines

Offshore wind turbines are constantly exposed to strong winds, waves, and seawater erosion. Their slewing bearings are made of highly corrosion – resistant stainless steel materials and coated with high – performance anti – corrosion coatings. In terms of wear resistance, by optimizing the slewing bearing structure and selecting self – lubricating materials, the friction loss is reduced, the power generation efficiency is improved, and the service life of the wind turbines is extended.

Price of Slewing bearings

There are many factors affecting the prices of slewing bearings. Firstly, raw materials play a significant role. High – quality steel has a high cost, and products made from it have excellent performance and long service life, thus commanding a high price. Secondly, slewing bearings with complex manufacturing processes and high – precision requirements require advanced equipment and strict quality control, which also leads to an increase in price. Moreover, the larger and more special the size and specifications are, the greater the processing difficulty and material consumption, and the higher the price will be.

Supplier of Slewing bearings

The products of Ldb bearing company cover a wide range and are widely used in multiple fields, demonstrating its strong capabilities. Advanced production and testing equipment are the cornerstone of high – quality products. Ldb bearing company is well aware of this and is equipped with nearly 30 sets of various types of equipment, providing hardware support for precision machining. With excellent product quality, strong technical strength, and a complete service system, Ldb bearing company has already become a benchmark in the slewing bearing industry. In the future, it is believed that it will continue to adhere to the concepts of innovation and quality supremacy, shine more brightly in the global market, and contribute more to the development of various industries.

Manufacturing Process of Slewing Bearings

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Slewing bearings, as crucial components in numerous mechanical equipments, have a complex and intricate manufacturing process. This process involves multiple key steps, and each step significantly impacts the quality and performance of the final product.

What is Slewing Bearing?

The slewing bearing is a large – scale bearing capable of withstanding comprehensive loads. It is used to support and connect mechanical components that need to rotate relative to each other. It typically consists of an inner ring, an outer ring, rolling elements, and a cage. Slewing bearings can simultaneously bear axial forces, radial forces, and overturning moments, and are widely applied in large – scale mechanical equipments such as cranes, excavators, wind turbines, and port machinery. Its function is to enable the rotating parts of the equipment to rotate stably and flexibly, ensuring the normal operation of the equipment, improving its working efficiency and reliability. It is an indispensable key component in many large – scale machines.

Raw Material Procurement and Inspection

The quality of raw materials serves as the foundation for the performance of slewing bearings. The main raw materials include high – quality steel, such as medium – carbon alloy steel, which is used to manufacture key components like inner and outer rings, as well as steel for rolling elements (steel balls or rollers). When purchasing, it is necessary to carefully screen suppliers to ensure that the materials meet national standards and design requirements. After the arrival of the goods, conduct a comprehensive inspection of the raw materials. Use spectral analysis to detect chemical components, evaluate mechanical properties through hardness tests and tensile tests, and check for internal and surface defects using ultrasonic flaw detection and magnetic particle flaw detection. Only raw materials with qualified indicators can enter the production process.

Part Machining of Slewing Bearings

Inner and Outer Ring Machining

Firstly, cut the steel to obtain blanks of appropriate sizes. In the rough turning process, remove most of the allowance, leaving a machining allowance of 0.5 – 1 mm for subsequent finish machining to improve processing efficiency. Finish turning ensures the dimensional accuracy and surface roughness of the inner and outer rings. The dimensional tolerance of the raceway part is controlled within ±0.01 mm, and the surface roughness reaches Ra0.8 – Ra1.6μm. In the milling process, machine structures such as mounting holes and keyways to ensure position accuracy. After the processing is completed, measure the dimensional accuracy again to ensure compliance with the design drawings.

Rolling Element Machining

If steel balls are used, process the steel into spherical blanks, and through processes such as rough grinding, fine grinding, and lapping, gradually improve the dimensional accuracy and surface quality of the steel balls, and control the roundness error within a very small range. The machining of rollers includes turning the outer circle, grinding, and lapping to ensure the cylindricity and surface roughness of the rollers and ensure smooth rolling within the raceway.

Cage Machining

Manufacture the cage by stamping, injection molding, or machining according to design requirements. Stamped cages are suitable for mass production with high efficiency; injection – molded cages have low costs and light weights; machined cages have high precision. After processing, check the dimensional accuracy, structural integrity, and surface quality of the cage to ensure that it can evenly separate the rolling elements and reduce friction and wear between the rolling elements.

Heat Treatment of Slewing Bearings

Quenching and Tempering

Inner rings, outer rings, and rolling elements need to undergo heat treatment after machining. Quenching can improve the hardness and strength of the material. Heat the parts to an appropriate temperature, hold for a certain period of time, and then cool rapidly. Tempering relieves the internal stress generated during quenching and adjusts hardness and toughness. Heat the quenched parts to a range lower than the quenching temperature, hold, and then cool. Through appropriate quenching and tempering processes, the comprehensive mechanical properties of the parts reach the optimal state.

Surface Treatment

To improve the wear resistance, corrosion resistance, and fatigue life of slewing bearings, surface treatment is often carried out. For example, use chemical heat treatment methods such as carburizing and nitriding to form a high – hardness hardened layer on the surface of the parts; or perform surface coating treatments such as electroplating and spraying to cover a protective film on the surface of the parts.

Assembly of Slewing Bearings

Cleaning and Inspection

Before assembly, thoroughly clean all parts to remove impurities such as oil stains and iron filings remaining during the machining process. After cleaning, check the dimensional accuracy, surface quality, and appearance of the parts again to ensure there are no defects or damages.

Assembly Process

First, fix the inner ring on the assembly platform, install the cage, and then install the rolling elements between the cage and the inner ring according to the specified quantity and interval. When installing the outer ring, ensure the fitting accuracy between the outer ring, the inner ring, and the rolling elements, and control the clearance within a reasonable range. If the clearance is too large, it will lead to a decrease in rotational accuracy and an increase in vibration; if the clearance is too small, it will increase friction and wear, and may even cause parts to seize. During the assembly process, use special tools and equipment to ensure assembly accuracy.

Pre – tensioning and Adjustment

Some slewing bearings need to be pre – tensioned. By applying a certain axial or radial force, the clearance is eliminated to improve rotational accuracy and rigidity. After pre – tensioning, test and adjust the rotational flexibility, radial and axial run – out, and other performances of the slewing bearing to ensure compliance with design requirements.

Quality Inspection of Slewing Bearings

Appearance Inspection

Inspect the appearance of the slewing bearing to ensure that there are no defects such as cracks, blowholes, and pores on the surface, and that the paint coating is uniform and free from peeling.

Dimensional Accuracy Detection

Use measuring tools to detect the diameters, widths, raceway sizes of the inner and outer rings, as well as the positions and sizes of the mounting holes, etc., to ensure compliance with the tolerance requirements of the design drawings.

Performance Testing

Carry out rotational flexibility tests to check whether the rotation process is smooth and free from jamming; measure radial and axial run – out to evaluate rotational accuracy; conduct loading tests to detect the bearing capacity and fatigue life of the slewing bearing, ensuring reliable performance in actual use.

Prices of Slewing Bearings

There are many factors affecting the prices of slewing bearings. Firstly, raw materials play a significant role. High – quality steel has a high cost, and products made from it have excellent performance and long service life, thus commanding a high price. Secondly, slewing bearings with complex manufacturing processes and high – precision requirements require advanced equipment and strict quality control, which also leads to an increase in price. Moreover, the larger and more special the size and specifications are, the greater the processing difficulty and material consumption, and the higher the price will be.

Suppliers of Slewing Bearings

The products of Ldb bearing company cover a wide range. Whether they are standard – sized or non – standard slewing bearings, the company can produce them with high quality to meet the diverse needs of different customers. Its products are widely used in multiple fields, demonstrating its strong capabilities.

Applications of Slewing bearings in the Forestry Industry

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In the forestry sector, slewing bearings play a significant role in various processes, from forest resource exploration and tree harvesting to wood processing. They provide crucial support for the efficient operation of forestry machinery, greatly enhancing the efficiency and quality of forestry production.

What is Slewing bearing?

The slewing bearing, also known as a turntable bearing, is a mechanical component that enables relative slewing motion between parts. It typically consists of an inner ring, an outer ring, rolling elements (such as steel balls or rollers), and a cage. Its key function is to simultaneously withstand axial forces, radial forces, and overturning moments. Slewing bearings are widely used in various construction machinery and industrial equipment. For example, cranes rely on them to achieve flexible rotation of the boom, excavators use them to ensure stable rotation of the upper part, and in wind turbines, they support the nacelle to rotate with the wind direction. Thanks to its structure, the slewing bearing can provide a stable slewing foundation for equipment, ensuring its efficient operation.

Applications in Forest Resource Exploration Equipment

During forest resource exploration, some specialized equipment depends on slewing bearings to achieve precise orientation adjustments. For instance, multi – spectral imaging devices mounted on drones or ground exploration vehicles can flexibly change the shooting angle with the help of slewing bearings, enabling comprehensive scanning of large – scale forests. The high – precision characteristics of slewing bearings ensure that the imaging devices remain stable during rotation, obtaining clear and accurate images. This facilitates forestry workers in analyzing the growth status of forest vegetation, the distribution of pests and diseases, and other information. At the same time, in geological exploration radar equipment, the slewing bearing allows the radar antenna to rotate 360 degrees, effectively detecting the underground geological structure and helping to determine the characteristics of forest soil, the groundwater level, etc., providing data support for the rational planning and protection of forests.

Applications in Logging Equipment

Logging Machinery,In modern logging operations, the harvester is one of the core pieces of equipment. The slewing bearing is installed at the joint of the harvester’s boom, allowing the cutting head of the harvester to rotate flexibly to meet the logging requirements of trees in different positions. It can withstand huge loads, including the reaction force generated during tree cutting and the gravity of the boom during extension and rotation. For example, in mountainous forest logging, the harvester needs to quickly adjust the angle of the cutting head through the slewing bearing to cut trees at different inclinations, improving logging efficiency while ensuring the safety of operators.

Log – Hauling Machinery,Log – hauling tractors or cable logging equipment also rely on slewing bearings when collecting felled timber. The boom of the log – hauling tractor can perform multi – angle lifting operations through the slewing bearing, enabling it to flexibly gather timber scattered in the forest. In the cable logging system, the pulley support can rotate freely on the cable by using the slewing bearing, keeping the timber stable during transportation, avoiding collisions and falling, and ensuring the smooth progress of log – hauling operations.

Applications in Wood Processing Equipment

Log Peeling Machines,Log peeling machines are the first – step equipment in wood processing. The slewing bearing is installed on the drum or cutter frame of the peeling machine, enabling the drum to rotate smoothly and drive the log to roll. At the same time, the cutter frame can adjust the angle according to the shape and size of the log. In this way, the peeling cutter can evenly contact the surface of the log, efficiently removing the bark. The stability of the slewing bearing ensures that the axial and radial positions of the log remain relatively fixed during the peeling process, improving the quality and efficiency of peeling and reducing wood waste.

Wood Cutting Equipment,In wood cutting equipment such as band saws and circular saws, the slewing bearing is used to support the rotating shaft of the saw blade and the rotating components of the worktable. It ensures that the saw blade remains stable during high – speed rotation, preventing saw blade wobbling from reducing cutting accuracy. At the same time, the slewing bearing of the worktable allows the wood to be cut at different angles, meeting the processing requirements of various specifications of wood. For example, when producing construction – grade wood, the slewing bearing helps the cutting equipment to accurately cut the log according to the preset size and angle, improving the utilization rate of wood and processing accuracy.

Wood Drying Equipment,In wood drying kilns, the slewing bearing is applied to the rotating system of the drying rack. The drying rack rotates slowly through the slewing bearing, ensuring that the wood is heated evenly during the drying process and avoiding uneven drying. This not only improves the drying quality of the wood but also effectively reduces the deformation and cracking problems caused by improper drying, enhancing the quality and economic value of the wood.

Applications in Forestry Cranes

Forestry cranes are mainly used for the loading, unloading, and lifting of timber. As a key component of the crane, the slewing bearing is installed between the slewing platform and the undercarriage of the crane. It bears the entire weight of the upper structure of the crane and various loads generated during timber lifting. It can achieve 360 – degree rotation of the upper structure of the crane, allowing the boom to flexibly adjust the working radius and angle, facilitating the lifting of timber from transport vehicles and placing it in the designated position. The high – performance of the slewing bearing ensures the stability and reliability of the forestry crane during frequent lifting and slewing operations, improving the efficiency of timber loading and unloading operations and reducing labor intensity.

With the continuous advancement of the forestry modernization process, the applications of slewing bearings in the forestry industry will become more extensive and in – depth. In the future, slewing bearings will develop towards higher precision, greater load – bearing capacity, and more energy – saving and environmental – friendly directions to meet the continuous upgrading requirements of forestry machinery. At the same time, the integration of slewing bearings with intelligent technology will also become a trend, realizing functions such as remote monitoring and fault warning, further enhancing the safety and efficiency of forestry production and providing strong support for the sustainable development of the forestry industry.

Prices of Slewing bearings

There are many factors affecting the price of slewing bearings. Firstly, raw materials. High – quality steel has a high cost, and products made from it have excellent performance and a long service life, so the price is also high. Secondly, slewing bearings with complex manufacturing processes and high – precision requirements need advanced equipment and strict quality control, and the price will also increase accordingly. Moreover, the larger and more special the size and specifications are, the greater the processing difficulty and the amount of materials used, and the higher the price will be.

Suppliers of Slewing bearings

Advanced production and testing equipment are the cornerstone of high – quality products. Ldb bearing company is well aware of this and is equipped with nearly 30 sets of various types of equipment, from 3m CNC drilling and milling machines to quenching machines, providing hardware support for precision processing. At the same time, the company has an experienced design and technical team. With their profound professional knowledge and innovative spirit, they continuously optimize product designs and overcome technical problems. For example, during the research and development process, in response to the balance problem between the load – bearing capacity and accuracy of large – scale slewing bearings, the team found an innovative solution after repeated tests and simulation analyses, significantly improving product performance.

How to Select the Appropriate Flange Bearing

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In a mechanical transmission system, flange bearings play a crucial role. They not only support the rotation of the shaft but also ensure the stable operation of the equipment. To select the appropriate flange bearing, it is necessary to comprehensively consider various factors.

What is flanged slewing bearing?

The flanged slewing bearing is a type of slewing bearing. It usually consists of components such as an inner ring, an outer ring, rolling elements (such as steel balls or rollers), and a cage, and is equipped with a flange structure. This flange can be easily fixed to other components of the equipment through connectors like bolts, enabling quick installation and precise positioning. It can simultaneously withstand axial forces, radial forces, and overturning moments, providing stable support for the slewing motion of the equipment. Due to its convenient installation and accurate positioning, it is widely used in fields such as tower cranes, port handling equipment, and industrial robots, ensuring the stability and reliability of these devices during operation.

Define the Working Conditions of slewing bearing

Magnitude and Direction，Accurately measure the magnitude of the load borne by the bearing and distinguish whether it is a radial load, an axial load, or a combination of both. For example, the spindle of a machine tool mainly bears radial cutting forces, while the wheel hub bearing of a car has to withstand both the radial load caused by the vehicle’s weight and the axial force generated during vehicle steering. Select a suitable flange bearing according to the load characteristics. For instance, deep – groove ball flange bearings can withstand certain radial and axial loads, and tapered roller flange bearings are better at withstanding larger axial and radial forces.

Nature，Determine whether the load is stable or impact – type. In the metallurgical industry, for example, the frequent handling of heavy objects subjects the flange bearings of cranes to impact loads. In such cases, self – aligning roller flange bearings that can withstand impacts should be selected. Their structure can buffer the impacts and prevent premature damage to the bearings.

Operating Speed，Select the appropriate flange bearing based on the operating speed of the equipment. For high – speed rotating equipment such as motors, the bearing is required to have a low friction coefficient and a high limiting speed. Ceramic ball flange bearings can be used. The low – friction characteristics of ceramic materials help reduce heat generation and meet the requirements of high – speed operation. For low – speed and heavy – load machinery, such as crushers in mining machinery, more attention is paid to the bearing’s load – bearing capacity, and the requirement for speed is relatively low. Spherical roller flange bearings are a good choice as they can withstand heavy loads at low speeds.

Operating Temperature，Consider the temperature range of the bearing’s working environment. In high – temperature environments, ordinary carbon steel flange bearings are prone to deformation and a decrease in hardness. High – temperature – resistant alloy – material flange bearings, such as those containing alloying elements like chromium and molybdenum, should be selected. These bearings can maintain good mechanical properties at high temperatures. In low – temperature environments, to avoid embrittlement of the bearing material, flange bearings made of special low – temperature steel should be chosen to ensure sufficient toughness and strength at low temperatures.

Consider the Equipment Requirements

Installation Space，Measure the dimensions of the installation space reserved in the equipment, including the inner diameter, outer diameter, and thickness of the bearing housing. If the installation space is limited, flange bearings with a compact outer dimension, such as thin – type flange bearings, should be selected. Their thin – type design can achieve good support and rotation functions in a narrow space. If the space is relatively sufficient, bearings of more suitable sizes can be selected according to load and speed conditions.

Accuracy Requirements，Select the bearing accuracy grade according to the equipment’s requirements for motion accuracy. Precision machine tools have extremely high requirements for processing accuracy and need to use high – precision P4 or P5 – grade flange bearings to ensure the dimensional accuracy and surface quality of the processed parts. For ordinary machinery with low accuracy requirements, such as agricultural machinery, ordinary – accuracy – grade (e.g., P0) flange bearings can meet the usage requirements.

Sealing Requirements，Analyze whether there are dust, moisture, corrosive media, etc., in the equipment’s working environment. In a dusty mining environment, to prevent dust from entering the bearing and aggravating wear, flange bearings with a sealing device, such as rubber – sealed flange bearings, should be selected. Their sealing structure can effectively block dust. In a humid or corrosive – medium environment, such as in chemical equipment, in addition to selecting sealed bearings, the corrosion resistance of the bearing material also needs to be considered. Stainless – steel flange bearings can be selected.

Understand the Bearing Characteristics

Structural Types，Familiarize yourself with the characteristics of different structural flange bearings. For example, flanged mounted bearings are easy to install and can be directly fixed on the equipment’s installation surface. Flanged spherical plain bearings have an automatic self – aligning function and can compensate for misalignment caused by installation errors or shaft deflection. Flange ball bearings have a low friction coefficient and high rotational speed, and flange roller bearings have a large load – bearing capacity. Select a bearing with a matching structure according to the actual needs of the equipment.

Material Characteristics，Understand the performance of commonly used bearing materials. Bearing steel is the most common material, with high hardness, high strength, and good wear resistance. Stainless – steel flange bearings have strong corrosion resistance. Ceramic – material bearings have characteristics such as low density, high hardness, high temperature resistance, and insulation. Select the appropriate bearing material according to the working conditions and equipment requirements.

Lubrication Methods，Different lubrication methods have a significant impact on the performance of flange bearings. Grease lubrication is simple to operate and convenient to maintain, and is suitable for medium – and low – speed, light – load, and occasions where it is not convenient to refuel frequently. Oil lubrication has good heat dissipation performance and can effectively reduce friction, and is often used in high – speed and heavy – load equipment. Determine the appropriate lubrication method according to the working conditions and requirements of the equipment, and select a flange bearing that matches it.

Prices of Flange Slewing bearings

There are many factors affecting the price of slewing bearings. Firstly, raw materials. High – quality steel has a high cost, and products made from it have excellent performance and a long service life, so the price is also high. Secondly, slewing bearings with complex manufacturing processes and high – precision requirements need advanced equipment and strict quality control, and the price will also increase accordingly. Moreover, the larger and more special the size and specifications are, the greater the processing difficulty and the amount of materials used, and the higher the price will be.

Suppliers of Flange Slewing bearings

With excellent product quality, strong technical strength, and a perfect service system, ldb bearing company has become a benchmark in the slewing bearing industry. In the future, it is believed that it will continue to adhere to the concept of innovation and quality first, shine more brightly in the global market, and contribute more to the development of various industries.

Influence of the Number of Balls on the Performance of Slewing bearings

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Slewing bearings, as crucial components in the mechanical field, are widely used in equipment such as cranes, excavators, and tunnel boring machines. Their performance is restricted by many factors, and the number of balls is one of the important influencing factors, playing a key role in load – bearing capacity, slewing accuracy, friction characteristics, service life, and other aspects.

What is Double – Row Ball Slewing bearing?

The double – row ball slewing bearing is a mechanical component used to achieve the slewing motion of components. It mainly consists of an inner ring, an outer ring, two rows of steel balls with the same diameter, and a cage. The two rows of steel balls are evenly distributed between the inner and outer rings and jointly bear axial forces, radial forces, and overturning moments. Relative slewing is achieved through the contact and rolling of the steel balls and the raceways. It has a simple structure, is easy to install, can withstand complex loads to a certain extent, and is often used in equipment such as small cranes, aerial work platforms, and small wind turbines that do not require particularly high slewing accuracy but need to bear certain axial and radial forces.

What is Four – Point Contact Slewing bearing?

The four – point contact slewing bearing is a type of slewing bearing. It is composed of an inner ring, an outer ring, steel balls, and a cage. Its uniqueness lies in that each steel ball has four – point contact with the raceways of the inner and outer rings. This structure enables it to simultaneously bear large axial forces, radial forces, and overturning moments. During operation, the four – point contact can effectively disperse the load and reduce local stress concentration. It is often used in equipment with compact space requirements and the need to bear multiple types of loads, such as tower cranes and port cranes. Compared with other slewing bearings, the four – point contact slewing bearing has a compact structure, occupies less space, and can provide reliable slewing motion and stable load – bearing performance in a limited space.

Load – Bearing Capacity of Slewing bearings

Increasing the number of balls can enhance the load – bearing capacity of slewing bearings. In a double – row ball slewing bearing, the steel balls are evenly distributed to bear axial forces, radial forces, and overturning moments. More steel balls mean a larger load – bearing area and a more uniform load distribution, which can share the force on a single steel ball. Taking a port crane as an example, when the number of balls in the slewing bearing increases, it can effectively disperse the huge forces generated when lifting heavy objects, prevent excessive wear or deformation of the steel balls, thereby enhancing the overall load – bearing capacity of the support and ensuring the safe and efficient operation of the equipment. However, the number of balls is not the more the better. Excessive balls will increase the contact stress between them, leading to increased friction and energy consumption, and instead reducing the load – bearing efficiency.

Slewing Accuracy of Slewing bearings

Slewing accuracy is an important performance indicator of slewing bearings. Appropriately increasing the number of balls helps to improve slewing accuracy. More steel balls make the load distribution more uniform, reducing eccentricity and shaking caused by uneven loads. For example, in the slewing bearing of a precision radar device, by increasing the number of steel balls, the load fluctuation borne by a single steel ball is reduced, making the radar more stable during rotation, with a smaller angular error, and ensuring its accurate tracking of targets. However, too many balls will increase the manufacturing and installation difficulties. Once there are deviations in the size or installation accuracy of the steel balls, it will instead damage the slewing accuracy and cause the equipment to operate unstably.

Friction Characteristics of Slewing bearings

The change in the number of balls has a significant impact on the friction characteristics of slewing bearings. As the number of balls increases, the contact area increases, and the friction resistance will also increase accordingly. In some equipment with high requirements for slewing flexibility, too many steel balls will cause difficult rotation and increased energy consumption. For example, in an aerial work platform, if the number of balls in the slewing bearing is too large, the operator will feel obvious jamming when turning the platform, increasing the operation difficulty and energy consumption. Conversely, if the number of balls is too small, the pressure on a single steel ball is high, and the wear will be accelerated, which will also affect the smoothness of slewing. Therefore, it is necessary to select the appropriate number of balls according to the equipment working conditions to balance the friction resistance and load – bearing capacity and ensure the normal operation of the equipment.

Service Life of Slewing bearings

The number of balls is closely related to the service life of slewing bearings. Reasonably increasing the number of balls can extend the service life. When the number of balls is sufficient, the load borne by a single ball is relatively reduced, and the degree of wear is reduced, which can effectively reduce the occurrence of fatigue wear and plastic deformation. Taking the slewing bearing of a wind turbine as an example, more steel balls can better bear the complex loads generated by the rotation of the blades, reduce the wear of the steel balls and raceways, extend the service life of the slewing bearing, and reduce the maintenance cost. However, if the number of balls exceeds the reasonable range, due to increased friction and heat generation, it will accelerate the aging and fatigue of the material and shorten the service life.

When designing and selecting slewing bearings, it is necessary to comprehensively consider the working conditions and performance requirements of the equipment to determine the number of balls. For heavy – load equipment, such as large – scale mining machinery, it is necessary to increase the number of balls to enhance the load – bearing capacity; for high – precision equipment, such as optical tracking equipment, it is necessary to reasonably increase the number of balls to ensure slewing accuracy. In addition, factors such as material properties, manufacturing processes, and costs also need to be combined to optimize the design of the number of balls while ensuring performance. With the continuous progress of materials science and manufacturing technology, it is expected that breakthroughs will be made in the optimization of the number of balls for slewing bearings in the future. By using new materials and advanced manufacturing processes, the distribution of the number of balls can be made more reasonable, improving performance while reducing costs to meet the higher requirements of different fields for slewing bearings.

Prices of Slewing bearings

There are many factors affecting the price of slewing bearings. Firstly, raw materials. High – quality steel has a high cost and can produce products with excellent performance and long service life, so the price is also high. Secondly, for slewing bearings with complex manufacturing processes and high – precision requirements, advanced equipment and strict quality control are required, which will also increase the price accordingly. Moreover, the larger and more special the size and specifications are, the greater the processing difficulty and the amount of materials used, and the higher the price will be.

Suppliers of Slewing bearings

The products of ldb bearing company cover a wide range. Whether they are standard – sized or non – standard slewing bearings, the company can produce them with high quality to meet the diverse needs of different customers. In the field of industrial robots, its slewing bearings help the joints of robots achieve high – precision and high – stability rotational motion, making the robot’s movements flexible and precise. In solar power generation equipment, they assist the tracking system in accurately tracking the sun, improving power generation efficiency. The wide application of its products in multiple fields demonstrates its strength.

Differences between Double-row different diameter ball slewing bearing and Double-Row Ball Slewing bearings

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Double-row different diameter ball slewing bearing and double-row ball slewing bearings are two common types of slewing bearings. They have some differences in structure, load-bearing capacity, application scenarios, and other aspects.

What is Double-Row Ball Slewing bearing?

The double-row ball slewing bearing is a mechanical component used to achieve the slewing motion of components. It mainly consists of an inner ring, an outer ring, two rows of steel balls with the same diameter, and a cage. The two rows of steel balls are evenly distributed between the inner and outer rings and jointly bear axial forces, radial forces, and overturning moments. Relative slewing is achieved through the contact and rolling of the steel balls and the raceways. It has a simple structure and is easy to install. It can withstand complex loads to a certain extent and is often used in equipment such as small cranes, aerial work platforms, and small wind turbines that do not require particularly high slewing accuracy but need to bear certain axial and radial forces.

What is Double-row different diameter ball slewing bearing?

The double-row different diameter ball slewing bearing is a slewing bearing device. It is composed of two rows of steel balls with different diameters, inner and outer rings, a cage, and other components. Usually, the diameter of the upper row of steel balls is smaller, mainly bearing axial forces and part of the overturning moment, while the diameter of the lower row of steel balls is larger, mainly bearing radial forces. This structural design can reasonably distribute forces according to different load types and achieve a high load-bearing capacity in a limited space. It has advantages such as good accuracy retention and can adapt to complex working conditions. It is often used in large-scale construction machinery and industrial equipment that require high load-bearing capacity and slewing accuracy, such as large cranes, tunnel boring machines, and large converters.

Structural Characteristics of Slewing bearings

Double-row different diameter ball slewing bearing: The load-bearing rolling elements are composed of two rows of steel balls with different diameters. Generally, the upper row of steel balls with a smaller diameter mainly bears axial forces and part of the overturning moment, and the lower row of steel balls with a larger diameter mainly bears radial forces. This structure can achieve a high load-bearing capacity in a small space by reasonably allocating the diameters and quantities of the steel balls.

Double-Row Ball Slewing bearings: There are two rows of steel balls with the same diameter. The two rows of steel balls are evenly distributed between the inner and outer rings. The two rows of steel balls jointly bear axial forces, radial forces, and overturning moments, and the slewing motion is realized through the contact between the steel balls and the raceways.

Load-Bearing Capacity of Slewing bearings

Double-row different diameter ball slewing bearing: Since steel balls of different diameters are used to bear different types of loads respectively, their load-bearing capacity is highly targeted. For working conditions with large axial forces, radial forces, and overturning moments simultaneously, they can distribute loads more reasonably. Under the same size, they can generally bear a larger overturning moment than double-row ball slewing bearings.

Double-Row Ball Slewing bearings: The two rows of steel balls bear loads evenly and can withstand axial and radial forces well. However, when bearing large overturning moments, due to the same diameter of the steel balls, the load distribution is relatively less reasonable than that of Double-row different diameter ball slewing bearing, and their load-bearing capacity is relatively limited.

Accuracy Retention of Slewing bearings

Double-row different diameter ball slewing bearing: The structural design makes the contact stress distribution between the steel balls and the raceways more uniform when bearing complex loads, which is conducive to reducing the wear and deformation of the raceways. Therefore, it can better maintain slewing accuracy during long-term use.

Double-Row Ball Slewing bearings: They are relatively weak in accuracy retention. Especially when bearing large eccentric loads or impact loads, the wear between the steel balls and the raceways may be aggravated, resulting in a rapid decline in slewing accuracy.

Friction Characteristics of Slewing bearings

Double-row different diameter ball slewing bearing: When the steel balls of different diameters roll, their linear velocities and angular velocities are different, which will generate a certain differential friction. However, through reasonable design and material selection, this differential friction can be controlled within a certain range, and it has little impact on the overall friction characteristics.

Double-Row Ball Slewing bearings: The two rows of steel balls have the same diameter and the same rolling speed. Their friction characteristics are relatively simple, with a small friction resistance, and can provide a relatively smooth slewing motion during low-speed operation.

Installation and Maintenance of Slewing bearings

Double-row different diameter ball slewing bearing: During installation, attention needs to be paid to the installation positions of the upper and lower rows of steel balls and the adjustment of the preload to ensure proper load-bearing and operation. During maintenance, due to the relatively complex structure, it is more difficult to inspect and replace the raceways and steel balls.

Double-Row Ball Slewing bearings: The installation is relatively simple. Only the installation accuracy of the two rows of steel balls and the uniform preload need to be ensured. In terms of maintenance, due to the more intuitive structure, it is relatively easy to inspect and replace components such as steel balls and raceways.

Application Scenarios of Slewing bearings

Double-row different diameter ball slewing bearing: They are often used in large-scale construction machinery that requires high load-bearing capacity and accuracy, such as large cranes and tunnel boring machines, as well as some industrial equipment that needs to operate under complex working conditions, such as port handling equipment and large converters.

Double-Row Ball Slewing bearings: They are suitable for equipment that does not require particularly high slewing accuracy but needs to bear large axial and radial forces, such as small cranes, aerial work platforms, and certain types of wind turbines.

In conclusion, Double-row different diameter ball slewing bearing and double-row ball slewing bearings each have their own characteristics and application ranges. In practical applications, it is necessary to comprehensively consider specific working conditions, equipment requirements, and economic factors to select the appropriate type of slewing bearing to ensure the safe and reliable operation of the equipment and good performance.

Prices of Slewing bearings

There are many factors affecting the price of slewing bearings. Firstly, raw materials. High-quality steel has a high cost and can produce products with excellent performance and long service life, so the price is also high. Secondly, for slewing bearings with complex manufacturing processes and high precision requirements, advanced equipment and strict quality control are required, which will also increase the price accordingly. Moreover, the larger and more special the size and specifications are, the greater the processing difficulty and the amount of materials used, and the higher the price will be.

Suppliers of Slewing bearings

The products of Ldb bearing company cover a wide range. Advanced production and testing equipment are the cornerstone of high-quality products. Ldb bearing company is well aware of this and is equipped with nearly 30 sets of various types of equipment, from 3m CNC drilling and milling machines to quenching machines, providing hardware support for precision processing. At the same time, the company has an experienced design and technical team. With their profound professional knowledge and innovative spirit, they continuously optimize product designs and overcome technical problems.

Double-row Ball Slewing bearings VS Four-point Contact Slewing bearings

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Double-row ball slewing bearings and four-point contact slewing bearings are two commonly used support structures in the mechanical field. The following are their differences and connections.

What is Double-row Ball Slewing bearing?

The double-row ball slewing bearing is a type of slewing bearing, mainly composed of components such as an inner ring, an outer ring, two rows of steel balls, and spacers. Its unique structure features two rows of steel balls. Compared with single-row ball slewing bearings, this design greatly improves the load-bearing capacity, enabling it to withstand large axial forces, radial forces, and overturning moments simultaneously. It is widely used in various large-scale mechanical equipment, such as port cranes, large excavators, wind power generation equipment, etc. It can ensure the smooth and flexible rotation of key components of the equipment, and is a crucial mechanical component for ensuring the normal operation and efficient operation of these devices. It plays an important role in enhancing the performance and reliability of the equipment.

What is Four-point Contact Slewing bearing?

The four-point contact slewing bearing is a mechanical component composed of an inner ring, an outer ring, rolling elements, etc. The rolling elements have four-point contact with the raceways of the inner and outer rings, and can withstand axial forces, radial forces, and overturning moments simultaneously. It has the characteristics of a compact structure, high rotation accuracy, and large load-bearing capacity, and is widely used in fields such as construction machinery, wind power, and robotics. It can achieve the smooth slewing motion of components and is an essential key component in many large-scale mechanical devices.

Differences of Double-row Ball Slewing bearings and Four-point Contact Slewing bearings

– Structural Features: The double-row ball slewing bearing has three rows of balls. The upper and lower rows are load-bearing balls, and the middle row is spacer balls, which are separated by a cage. The structure is compact and has good rigidity. The four-point contact slewing bearing consists of two raceways, with arc-shaped raceways. The balls have four-point contact with the raceways and can withstand axial forces, radial forces, and overturning moments simultaneously. The structure is relatively simple.

– Load-bearing Capacity: The double-row ball slewing bearing has a large number of evenly distributed balls, which can withstand large axial forces, radial forces, and overturning moments, and is suitable for large-scale mechanical equipment. The balls of the four-point contact slewing bearing have four-point contact with the raceways, and its load-bearing capacity is relatively small, making it suitable for small and medium-sized mechanical equipment.

– Rotational Flexibility: The double-row ball slewing bearing has a large number of balls, resulting in high rolling friction resistance and relatively poor rotational flexibility. The four-point contact slewing bearing has fewer contact points between the balls and the raceways, low rolling friction resistance, and good rotational flexibility.

– Installation Method: The double-row ball slewing bearing is usually fixed to the equipment by bolt connection or welding, and requires high installation accuracy. The installation methods of the four-point contact slewing bearing are more flexible, and can be bolt connection, pin connection, or interference fit. The installation accuracy requirements are relatively low.

– Application Scenarios: The double-row ball slewing bearing is often used in large construction machinery such as large cranes, port machinery, and excavators, as well as in large equipment such as wind turbines and Ferris wheels. The four-point contact slewing bearing is often used in small and medium-sized construction machinery such as small and medium-sized cranes, forklifts, and aerial work platforms, as well as in fields such as industrial robots and automated production lines.

Connections of Double-row Ball Slewing bearings and Four-point Contact Slewing bearings

– Functional Role: Both double-row ball slewing bearings and four-point contact slewing bearings are used to achieve the slewing motion of mechanical equipment, support the weight and load of the equipment, and enable the equipment to rotate flexibly within a certain angle range.

– Working Principle: Both are based on the principle of rolling friction. The slewing motion is achieved through the rolling of the balls in the raceways, reducing the friction resistance and improving the rotation efficiency.

– Materials and Manufacturing Processes: The materials used to manufacture double-row ball slewing bearings and four-point contact slewing bearings are usually high-strength alloy steels, which are processed through multiple processes such as forging, heat treatment, and machining to ensure good strength, hardness, and wear resistance.

– Maintenance: During the use process, both double-row ball slewing bearings and four-point contact slewing bearings need to be regularly maintained, including cleaning, lubrication, and inspection of the wear of the balls and raceways, etc., to extend their service life and ensure the normal operation of the equipment.

Double-row ball slewing bearings and four-point contact slewing bearings have certain differences in structural features, load-bearing capacity, rotational flexibility, installation methods, and application scenarios. However, they have many similarities in functional roles, working principles, materials and manufacturing processes, and maintenance. In practical applications, it is necessary to select the appropriate type of slewing bearing according to specific equipment requirements and working conditions.

Prices of Slewing bearings

There are many factors that affect the price of slewing bearings. Firstly, the raw materials matter. High-quality steel has a high cost, and products made from it have excellent performance and a long service life, thus having a higher price. Secondly, slewing bearings with complex manufacturing processes and high precision requirements require advanced equipment and strict quality control, which will also increase the price accordingly. Moreover, the larger and more special the size and specifications are, the greater the processing difficulty and material consumption, and the higher the price will be.

Supplier of Slewing bearings

In terms of quality, ldb bearing company has achieved excellence. Every link from the incoming inspection of raw materials to the delivery of finished products is strictly controlled. Multidimensional inspections are carried out on raw materials to ensure that their quality meets the standards. During the production process, each processing procedure is strictly supervised, and detailed records are kept. With its excellent product quality, strong technical strength, and complete service system, ldb bearing company has become a benchmark in the slewing bearing industry. In the future, it is believed that it will continue to uphold the concept of innovation and quality first, shine more brightly in the global market, and contribute more to the development of various industries.

How to Maintain Double-row Ball Slewing bearings

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Double-row ball slewing bearings play a crucial role in many large-scale mechanical equipment. Their operating conditions are directly related to the stability and service life of the equipment. Maintain them well can not only extend their service life but also ensure the efficient and safe operation of the equipment.

What is Double-row Ball Slewing bearing?

A double-row ball slewing bearing is a type of slewing bearing, mainly composed of inner rings, outer rings, two rows of steel balls, and spacers. Its unique structure features two rows of steel balls. Compared with single-row ball slewing bearings, this design greatly improves the load-carrying capacity and can simultaneously withstand large axial forces, radial forces, and overturning moments. It is widely used in various large-scale mechanical equipment, such as port cranes, large excavators, and wind power generation equipment. It can ensure the smooth and flexible rotation of key components of the equipment and is a key mechanical component to ensure the normal operation and efficient operation of these equipment, playing an important role in enhancing the performance and reliability of the equipment.

Methods for Maintaining Double-row Ball Slewing Rings

Daily inspection is the basic work of maintaining double-row ball slewing bearings. Before and after each use of the equipment, a detailed inspection of the slewing bearing should be carried out. Check whether there are obvious cracks, scratches, or deformations on the surface of the slewing bearing. If cracks are found, even slight ones, they may gradually expand during the operation of the equipment and eventually lead to the failure of the slewing bearing. It must be replaced in a timely manner. Scratches will damage the surface accuracy of the slewing bearing and accelerate wear. It is necessary to evaluate its severity and decide whether to repair or replace it. At the same time, check whether the connecting bolts of the slewing bearing are loose. Loose bolts will cause additional vibration and displacement during the operation of the slewing bearing, affecting the equipment accuracy and even causing safety accidents. Once loose bolts are found, they should be tightened according to the specified torque immediately. In addition, pay attention to observing the sealing condition of the slewing bearing. Check whether the seals are damaged or aged. If there are any problems, replace the seals in a timely manner to prevent dust, impurities, and moisture from invading and avoid wearing and corroding the rolling elements and raceways.

Lubrication is the core link in maintaining double-row ball slewing bearings. During the operation of the slewing bearing, there is relative motion between the rolling elements and the raceways. Good lubrication can effectively reduce the friction coefficient, reduce wear, and extend the service life. Select appropriate lubricants according to the working environment and requirements of the slewing bearing. Under general working conditions, lithium-based grease can be selected; in high-temperature environments, high-temperature-resistant grease should be used; in environments with a risk of chemical corrosion, lubricants with anti-corrosion properties are required. The frequency of lubrication is also crucial. Excessive lubrication will cause waste of lubricants, increase costs, and may also adsorb more dust; untimely lubrication will lead to increased wear of components. Usually, after the equipment has been in operation for a certain period of time or worked for a certain number of hours, supplementary lubrication should be carried out. For example, for continuously operating equipment, lubrication should be carried out at least once a week; for intermittently used equipment, the lubrication cycle can be determined according to the actual working hours. When adding lubricants, ensure that the lubricants are evenly applied to the surfaces of the rolling elements and raceways. You can inject oil through a special oil injection nozzle until new lubricants are extruded from the seal to ensure sufficient lubrication.

Regular cleaning of double-row ball slewing bearings is also essential. During the operation of the equipment, the slewing bearing will adsorb a large amount of dust and impurities. If these substances are not cleaned in a timely manner, they will enter the interior of the slewing bearing and accelerate wear. When cleaning, first cut off the power supply of the equipment to ensure operation safety. Then, use a clean cloth or brush to gently wipe the dust and dirt on the surface of the slewing bearing. For stubborn oil stains and impurities, an appropriate amount of cleaning agent can be used, but pay attention to choosing a cleaning agent that has no corrosive effect on the slewing bearing. After cleaning, rinse with clean water and dry the surface moisture to prevent the remaining cleaning agent from corroding the slewing bearing. At the same time, also clean the environment around the slewing bearing, keep the area around the equipment clean, and reduce the source of dust and impurities.

Regularly detecting and adjusting the accuracy of double-row ball slewing bearings can ensure the normal operation accuracy of the equipment. With the use of the equipment, accuracy problems such as radial runout, axial runout, and end face runout may occur in the slewing bearing. Professional detection tools such as dial indicators can be used to regularly detect the accuracy of the slewing bearing. If the accuracy is found to exceed the specified range, adjustments should be made in a timely manner. During the adjustment, corresponding measures should be taken according to specific accuracy problems. For example, for excessive radial runout, the bearing clearance can be adjusted to solve it; for axial runout problems, it may be necessary to adjust the installation position of the slewing bearing or replace relevant components. During the adjustment process, strictly follow the equipment operation manual to ensure the accuracy and safety of the adjustment.

Storage maintenance is also an important part of the maintenance of double-row ball slewing bearings. If the equipment is not used for a long time, the slewing bearing needs to be properly stored. First, clean the surface of the slewing bearing and apply a layer of anti-rust oil to prevent rust. Then, place the slewing bearing in a dry and well-ventilated warehouse to avoid getting damp and rained on. When storing, avoid subjecting the slewing bearing to heavy pressure or collisions to prevent deformation. For large slewing bearings, special brackets can be used for storage to ensure their stable state. At the same time, regularly check the stored slewing bearings to see if the anti-rust oil has fallen off and if there are signs of rust on the surface. If there are any problems, deal with them in a timely manner.

Maintaining double-row ball slewing bearings is a systematic and meticulous task, covering many aspects such as daily inspection, lubrication, cleaning, accuracy detection and adjustment, and storage maintenance. Only by doing a good job in the maintenance of each link can the double-row ball slewing bearing always be in a good operating state, providing strong support for the stable operation of the equipment, reducing the equipment maintenance cost, and improving production efficiency.

The Price of Double-row Ball Slewing bearings

There are many factors affecting the price of slewing bearings. Firstly, raw materials: high-quality steel has a high cost, and products made from it have excellent performance and a long service life, so the price is high. Secondly, slewing bearings with complex manufacturing processes and high precision requirements require advanced equipment and strict quality control, and their prices will also increase accordingly. Moreover, the larger and more special the size and specifications are, the greater the processing difficulty and material consumption, and the higher the price.

Suppliers of Double-row Ball Slewing bearings

In terms of services, ldb bearing Company is also remarkable. Before sales, it provides professional selection suggestions according to customers’ needs and can also customize products or upgrade the existing slewing structures of main engines. During sales, it strictly controls the production progress and quality to ensure the on-time and high-quality delivery of products.With excellent product quality, strong technical strength, and a perfect service system, ldbbearing Company has become a benchmark in the slewing bearing industry. In the future, it is believed that it will continue to uphold the concept of innovation and quality first and shine more brightly in the global market, contributing more to the development of various industries.