Bearing Knowledge - LDB

The Influence on Materials of Slewing Bearing

March 31, 2025/in Bearing Knowledge /by wang

In the industrial field, slewing bearings serve as the crucial hubs of various large – scale mechanical equipment. They can be found everywhere, from the tower cranes on construction sites to the rotating bases of astronomical telescopes. A slewing bearing not only has to withstand huge axial forces, radial forces, and overturning moments but also ensures that the equipment can rotate flexibly and smoothly. The realization of all these performances depends on high – quality materials.

What is a Slewing Bearing?

A slewing bearing is a large – scale bearing capable of withstanding comprehensive loads. It plays a vital connecting and supporting role in numerous large – scale mechanical equipment. Its structure mainly consists of an inner ring, an outer ring, rolling elements, and a cage. The relative rotation is achieved through the rolling of the rolling elements between the inner and outer rings, thereby supporting the smooth rotation of equipment components. Slewing bearings can withstand large axial forces, radial forces, and overturning moments and are widely used in equipment such as cranes, excavators, wind turbines, and solar tracking systems. It not only ensures the structural stability of the equipment but also enables the equipment to operate flexibly under complex working conditions, playing a key role in enhancing the overall performance and work efficiency of the equipment.

Characteristics and Applications of Commonly Used Materials

Medium – Carbon Alloy Steel: The Balance of Strength and Toughness

Medium – carbon alloy steel is one of the commonly used materials for slewing bearings, with 42CrMo steel being a typical representative. The carbon content of such steel is between 0.3% – 0.6%. After appropriate quenching and tempering treatments, it can possess excellent strength and toughness. In large – scale port cranes, the slewing bearing needs to bear a lifting weight of dozens to hundreds of tons and also withstand the impacts caused by frequent starting, stopping, and turning. With a yield strength of over 930MPa and a tensile strength of over 1080MPa, 42CrMo steel firmly supports the upper structure of the crane, ensuring the normal rotation of the turntable under heavy workloads, avoiding deformation or fracture due to excessive stress, and ensuring the efficient and safe operation of cargo handling operations.

Alloy Structural Steel: The Combination of Wear Resistance and Toughness

20CrMnTi, a low – carbon alloy carburizing steel, is also an ideal material for slewing bearings. Its carbon content is approximately 0.2%. After carburizing, quenching, and low – temperature tempering treatments, the surface hardness can reach HRC58 – 62, forming a hard and wear – resistant surface layer, while the core still maintains good toughness. In the construction machinery field, such as the slewing platform support of excavators, during operation, it not only has to withstand the strong impact force generated by excavation operations but also resist the wear caused by long – term rotation. The high – hardness surface layer of 20CrMnTi steel after carburization effectively reduces the degree of wear and extends the service life, and the toughness of the core ensures that it will not undergo brittle fracture when subjected to instantaneous impacts, guaranteeing the stable operation of the excavator.

Special – Performance Materials: Coping with Extreme Working Conditions

In some special environments, ordinary alloy steels are difficult to meet the requirements, so special – performance materials have emerged. In the slewing bearings of high – temperature furnaces in the metallurgical industry, high – temperature alloys come into play. For example, the Inconel 718 alloy can still maintain a relatively high yield strength and tensile strength at a high temperature of 650°C. With its good high – temperature strength, oxidation resistance, and thermal stability, it can work stably in a high – temperature environment for a long time, ensuring the normal operation of the furnace. In the marine engineering field, since the equipment is long – term exposed to high – humidity and highly corrosive seawater, 316L stainless steel has become one of the preferred materials for slewing bearings. It is rich in nickel and molybdenum elements and has excellent seawater corrosion resistance, which can effectively resist seawater erosion, prevent rust and corrosion, extend the service life of the equipment, and reduce maintenance costs.

Consideration Factors in Material Selection

The selection of slewing bearing materials is a comprehensive trade – off process. First, the working conditions of the equipment are key factors. The magnitude of the working load, the speed of rotation, and the temperature, humidity, and pH value of the operating environment all determine the required properties of the materials. For example, in the slewing bearings of high – speed centrifuges, the materials not only need to have high strength and hardness but also good dynamic balance performance to avoid vibrations and noises generated by high – speed rotation. Second, the machinability of the materials cannot be ignored, including cutting machinability, forging performance, and heat treatment performance. Materials that are easy to process can reduce manufacturing costs and improve production efficiency. Finally, cost factors also play an important role in material selection. Under the premise of meeting performance requirements, choosing materials with high cost – performance can effectively control the overall cost of the equipment and improve the competitiveness of products.

New Trends in Material Development

With the continuous progress of industrial technology, slewing bearings face more complex working conditions and higher performance requirements, and material development also shows new trends. On the one hand, high – performance materials are constantly emerging. For example, ceramic – matrix composites combine the high hardness and high – temperature resistance of ceramics with the high strength and high toughness of composites, and are expected to be widely used in slewing bearings in fields such as aerospace and high – speed precision machinery. On the other hand, the greening and sustainable development of materials have also become an important direction. The development of environmentally friendly and recyclable materials can not only reduce the impact on the environment but also achieve the recycling of resources. At the same time, the development of material surface treatment technology has opened up new ways to improve the performance of slewing bearings. Through advanced technologies such as nano – coatings and ion implantation, a special – performance layer can be formed on the surface of the materials, further improving their wear resistance, corrosion resistance, and fatigue life.

The Price of Slewing Bearing Materials

The prices of slewing bearing materials are affected by multiple factors. First, the cost of raw materials is a major factor. The price fluctuations of alloying elements such as chromium and molybdenum directly affect the cost of steel. If the steel contains scarce elements such as tungsten and vanadium, the price will increase due to the high difficulty of mining and acquisition. Second, the production process difficulty is also crucial. Advanced smelting and high – precision processing not only require specialized equipment but also rely on high – tech personnel, greatly increasing the cost. Finally, market supply and demand have a significant impact. With the development of the wind power and construction machinery industries, the demand for slewing bearings has increased. When the demand exceeds the supply, the material price rises. Conversely, if the production capacity of material manufacturers is sufficient and the output is high, resulting in oversupply, the price will decline.

Supplier of Slewing Bearings

LDB Bearing always adheres to the concept of “win – win with customers” and embodies the responsibility of modern industry. With innovation and quality at its core, LDB Bearing continuously provides global customers with products and services beyond expectations. LDB Bearing is not only a link in mechanical transmission but also a powerful engine driving the industrial civilization to a higher level.

What is the slewing bearing of a CT scanner?

March 31, 2025/in Bearing Knowledge /by wang

The slewing bearing of a CT scanner is a crucial component. It consists of inner and outer rings, rolling elements, etc., and features high precision, high speed, high stability, high reliability, and low noise. When the CT scanner is in operation, the slewing bearing drives the X – ray tube and detector to rotate rapidly and accurately around the patient, precisely collecting data and ensuring the stable operation of the equipment. Due to the extremely high requirements for image quality in CT scanning, the slewing bearing needs to meet special requirements such as high precision, high – speed rotation, and stability. The performance of the slewing bearing is directly related to the imaging quality and operation efficiency of the CT scanner. With the advancement of medical technology, its role in the medical field will become even more important.

What are the characteristics of the slewing bearing of a CT scanner?

High precision: It needs to reach sub – millimeter or even higher precision to ensure the precise position of the X – ray tube and detector during rotation, avoid image artifacts, and provide accurate data for diagnosis. High speed: It can achieve rapid rotation, greatly shortening the scanning time, improving the inspection efficiency, and reducing the waiting and inspection time of patients. High stability: It operates stably, reducing vibrations and preventing interference with the scanning results due to shaking, ensuring clear and accurate images. High reliability: It can work continuously and stably for a long time, has good fatigue resistance and wear resistance, and reduces equipment failures and maintenance times. Low noise: It produces low noise during operation, creating a quiet inspection environment for patients, reducing psychological stress, and facilitating patient cooperation.

Structural composition

The slewing bearing is mainly composed of core components such as inner and outer rings and rolling elements. The outer ring can be toothed or non – toothed, and the same applies to the inner ring. The sealing strip can effectively prevent dust, impurities, etc. from entering the interior, protecting the rolling elements and raceways. The rolling elements are divided into two forms: balls and rollers, which roll between the raceways of the inner and outer rings to realize the rotation function of the slewing bearing. The oil filling nozzle is used to add lubricant to reduce friction between components; the plugs and plug pins are used to seal relevant oil passages or mounting holes. In addition, there are spacers or cages, whose function is to evenly separate the rolling elements and ensure the orderly movement of the rolling elements.

Model classification

Slewing bearings have a variety of model classifications, and different models are suitable for different working scenarios. The single – row four – point contact ball slewing bearing consists of two raceways, is compact in structure and light in weight. The steel balls contact the circular arc raceways at four points, and it can simultaneously withstand axial force, radial force, and overturning moment. It is commonly used in construction machinery such as rotary conveyors. The double – row ball slewing bearing with different diameters has three raceways. According to the force conditions, two rows of steel balls with different diameters are arranged up and down. It is convenient for open – type assembly and can withstand a large axial force and overturning moment. It is mostly used in handling machinery such as tower cranes with medium – sized or larger diameters. The single – row crossed roller slewing bearing consists of two raceways, is compact in structure, light in weight, high in manufacturing precision, and small in assembly clearance. The rollers are arranged in a 1:1 cross – pattern and can withstand axial force, overturning moment, and a large radial force. It is widely used in fields such as hoisting and transportation, construction machinery, and military products. The three – row roller slewing bearing has three raceways, and the upper, lower, and radial raceways are separated from each other. It can simultaneously withstand various loads and has the largest load – bearing capacity. It is suitable for heavy machinery such as bucket – wheel excavators. The light – type series slewing bearing has the same structural form as the ordinary slewing bearing, but it is lighter in weight and more flexible in rotation. It is applied to fields such as food machinery that have high requirements for weight and flexibility.

Construction and structural features

The slewing bearing usually forms a slewing drive device together with components such as worms, housings, and motors. Its core slewing bearing can simultaneously withstand axial force, radial force, and overturning moment. Some slewing drive products, such as NFB slewing drives, have advantages such as easy installation, easy maintenance, and space – saving installation.

Heat treatment

The raceways are processed by surface induction hardening, and the quenching hardness reaches HRC55 – 62 to ensure a sufficient hardened layer depth, enhancing wear resistance and load – bearing capacity. The teeth on the slewing bearing rings are generally in the heat – treatment state of normalizing or quenching and tempering. The tooth surface can be quenched as required, and the quenching hardness is HRC50 – 60. According to the application scenarios, it is divided into full – tooth quenching and single – tooth induction quenching (which is further divided into tooth – surface – and – root quenching and tooth – surface quenching).

Working mode

The slewing bearing has two basic working modes: one is that the inner ring is fixed to play a supporting role, and the outer ring rotates; the other is that the outer ring is fixed to play a supporting role, and the inner ring rotates.

CT Scanner: The “X – Ray Eye” of Modern Medicine

A CT scanner, that is, a computed tomography device, is an indispensable and important tool in modern medical diagnosis. It emits and receives X – rays from multiple angles around the patient’s body to obtain tomographic images of the human body’s interior, providing doctors with extremely detailed and accurate information for disease diagnosis.

The core role of the slewing bearing in a CT scanner

Driving component rotation

When the CT scanner is working, the slewing bearing shoulders the important task of driving the X – ray tube and detector to rotate rapidly and accurately around the patient. During this process, the slewing bearing must ensure that the position accuracy of the X – ray tube and detector reaches the sub – millimeter level. Only in this way can the X – ray attenuation data inside the human body be accurately collected from different angles, providing a solid guarantee for the subsequent reconstruction of high – quality three – dimensional tomographic images of the human body. For example, in a head CT scan, the slewing bearing drives the X – ray tube and detector to rotate rapidly around the patient’s head, obtaining scan data from multiple angles in a very short time, thus clearly presenting the internal structure of the head.

Ensuring operation stability

CT scanners often need to work continuously for a long time, and the slewing bearing must have excellent anti – fatigue performance. It needs to be able to withstand long – term, high – intensity operation to ensure the stable operation of the CT machine. At the same time, the good rigidity and accuracy retention of the slewing bearing are also crucial, because any vibration or deformation may have a negative impact on the image quality. Take the CT inspection room of a large general hospital as an example. The CT scanner examines a large number of patients every day, and the stable operation of the slewing bearing is directly related to the smooth progress of the inspection work.

Achieving precise positioning

When scanning different parts or executing different scanning protocols, the slewing bearing needs to precisely control the rotation angle and position to make the X – ray tube and detector accurately aim at the target area. For example, in a high – resolution CT scan of the lungs, the slewing bearing needs to accurately adjust the angle to ensure that the X – ray tube and detector can obtain clear images of the fine structures of the lungs, providing accurate basis for doctors to diagnose lung diseases.

Special requirements of CT scanners for slewing bearings

High precision

CT scanning has extremely high requirements for image quality, and the precision of the slewing bearing directly affects the accuracy of the scanning data. Its manufacturing and installation precision requirements reach sub – millimeter or even higher levels to ensure the stable and precise position of the X – ray tube and detector during rotation. Even a slight deviation may lead to image artifacts and affect the doctor’s diagnosis.

High speed rotation and stability

To improve the scanning efficiency, the slewing bearing needs to be able to achieve high – speed rotation while ensuring a stable rotation process. High – speed rotation can shorten the scanning time, reduce the patient’s discomfort and motion artifacts. And stability is the key to ensuring image quality, avoiding impacts on the scanning results due to vibrations, jams, etc. For example, in a cardiac CT scan, only a fast and stable rotation can capture the accurate shape of the heart at different times.

High reliability and durability

CT scanners are used frequently, and the slewing bearing needs to have high reliability and a long service life to reduce equipment maintenance and downtime. This requires the use of high – quality materials and strict quality inspection and durability testing, with good anti – fatigue, wear – resistant and other properties. Once the CT equipment in a hospital fails, it will affect the inspections and diagnoses of a large number of patients. Therefore, the reliability and durability of the slewing bearing are of great significance.

Low noise and low vibration

In order to provide patients with a quiet and comfortable inspection environment and avoid interference with the scanning results, the slewing bearing should minimize noise and vibration during operation. This can be achieved by optimizing the structural design, selecting appropriate rolling elements, and using proper lubrication methods. When patients are examined in a quiet environment, their psychological stress is relatively low, which is also more conducive to their cooperation.

In conclusion, the slewing bearing and the CT scanner are closely connected. The performance of the slewing bearing is directly related to the imaging quality and operation efficiency of the CT scanner. With the continuous development of medical technology, the requirements for slewing bearings and CT scanners will become higher and higher, and they will also play a more important role in the medical field.

The price of the slewing bearing of a CT scanner

The price of the slewing bearing of a CT scanner is affected by many factors. The material is crucial. Slewing bearings made of high – quality steel or special alloys have a relatively high price due to high costs. Precision requirements are also important. The high – precision slewing bearings required for CT scanners have complex manufacturing processes and strict inspections, increasing costs and thus driving up prices. The price also varies depending on the load – bearing capacity. Slewing bearings that can withstand greater axial, radial forces, and overturning moments have more complex structures and materials, resulting in higher prices.

The supplier of the slewing bearing of a CT scanner

Looking to the future, LDB bearing will continue to adhere to the corporate vision of “meticulous manufacturing, serving the world”, continuously increase R & D investment, improve product quality and technical levels, expand market areas, strengthen international cooperation, and strive towards the goal of becoming a world – class bearing manufacturer. It is believed that with the joint efforts of all employees of LDB bearing, this enterprise, which carries numerous honors and dreams, will surely write an even more glorious chapter in the industrial bearing field and make greater contributions to the development of the global industry.

Why Slew bearings Are So Important?

March 29, 2025/in Bearing Knowledge /by wang

In the vast and complex industrial system, there is a seemingly unremarkable yet crucial component – the slew bearing. It’s like the joint of industry, supporting the rotational motion of various machines and enabling the smooth operation of the industrial giant wheels. From daily – used home appliances to high – speed cars, from towering wind turbines to sophisticated medical equipment, slew bearings are everywhere. Despite their small size, they possess great power and are an indispensable part of modern industry.

What Is a Slew bearing

The main function of a slew bearing is to support a mechanical rotating body, reduce the friction coefficient during its motion, and ensure its rotational accuracy. Simply put, it’s like a bridge connecting the rotating components and the fixed machine body, allowing the components to rotate smoothly. Its working principle is based on replacing sliding friction with rolling friction. By placing rolling elements (such as balls or rollers) between the shaft and the slew bearing housing, the friction is greatly reduced. Take the deep – groove ball slew bearing as an example. It is the most representative rolling slew bearing. When the shaft rotates, the balls roll between the inner and outer rings with minimal friction, enabling the shaft to rotate at high speed and smoothly. This design not only improves the mechanical efficiency but also extends the service life of the equipment.

Types of Slew bearings

There is a wide variety of slew bearing types, and different types have different characteristics and application scenarios. Common types include deep – groove ball slew bearings, self – aligning ball slew bearings, cylindrical roller slew bearings, and tapered roller slew bearings.

Deep – groove ball slew bearings have a simple structure, low manufacturing cost, small friction coefficient, and high limiting speed. They are the most widely used, often applied in fields such as motors, automobiles, and home appliances.

Self -aligning ball slew bearings have excellent self – aligning performance and can compensate for coaxiality errors. They are suitable for situations where the shaft is bent under stress or misaligned during installation, such as in mining machinery and metallurgical machinery.

Cylindrical roller slew bearings have a large radial load – carrying capacity and are suitable for heavy – load applications. They can often be found in equipment like machine tool spindles and large – scale motors.

Tapered roller slew bearings can withstand both radial and single – direction axial loads. They are commonly used in industries such as automotive, rolling mills, and mining machinery.

Applications of Slew bearings in Various Fields

Transportation Field: In automobiles, slew bearings are widely used in components such as engines, transmissions, and wheel hubs. The slew bearings in the engine support the rotation of the crankshaft to ensure the normal operation of the engine, and those in the transmission enable efficient power transmission between different gears. It is estimated that an ordinary car requires approximately 100 – 150 slew bearings. In rail transportation, high – precision slew bearings are essential for key parts of high – speed trains, such as traction motor slew bearings and bogie axle box slew bearings. These slew bearings not only need to withstand huge loads but also maintain stable performance at high speeds to ensure the safe and smooth operation of the train.

Energy and Power Field: Wind turbines are an important representative of clean energy. Their main shaft slew bearings, pitch and yaw slew bearings, etc., are core components of the turbines. For a 3MW wind turbine, the outer diameter of the main shaft slew bearing can exceed 2m, and it needs to withstand significant axial and radial loads. The requirements for slew bearings in the nuclear power field are even more stringent. The main pump thrust slew bearing needs to support hundreds of tons of weight, and the control rod drive mechanism slew bearings need to work stably in a high – radiation environment.

High – end Manufacturing Field: In CNC machine tools, the rotational speed of the motorized spindle slew bearings can reach over 40,000 rpm, and the ball screw support slew bearings ensure the high – precision positioning of the machine tool. The crossed roller slew bearings in the RV reducers of industrial robots need to meet an accuracy requirement of ABEC7 or above to ensure the precise and stable movement of the robots. The magnetic levitation slew bearings in semiconductor equipment’s vacuum coating machines can achieve high – precision rotation in a dust – free environment, meeting the strict requirements of semiconductor manufacturing.

Consumer Goods and Daily Life Field: In daily life, slew bearings are also everywhere. The annual demand for air – conditioner compressor slew bearings exceeds 500 million sets, ensuring the efficient operation of air conditioners. The silent slew bearings in washing machines reduce the noise during operation, enhancing the user experience. The slip ring slew bearings in CT machines in medical devices adopt an integrated design of conductive slip rings, enabling 360 – degree rotational scanning of the CT machines.

Development Status and Trends of the Slew bearing Industry

With the continuous development of the global manufacturing industry, the slew bearing industry is also making continuous progress. Currently, the global slew bearing market is huge. In 2023, it reached 143.6 billion US dollars and maintained an annual compound growth rate of 8.3%. Among them, the automotive industry is the largest application field for slew bearings, accounting for 32%, followed by the industrial machinery and energy fields.

In terms of technological development, slew bearings are moving towards the direction of intelligence, lightweight, and high – performance. By using new materials and optimizing the structure, the weight of slew bearings is reduced, and energy consumption is decreased. High – performance slew bearings continue to break through in terms of high – speed, high – precision, and high – reliability.

As the joints of industry, slew bearings, despite their small size, play an irreplaceable role in various fields. Their development not only promotes the progress of industry but also brings convenience to people’s lives. With continuous technological innovation and the expansion of application fields, it is believed that slew bearings will continue to shine in future industrial development and contribute to the goal of becoming a manufacturing powerhouse.

The Price of Slew bearing

Slew bearing prices are affected by multiple factors. In terms of raw materials, the type of steel (such as high – carbon chromium steel or special alloys) and fluctuations in the supply chain directly determine the cost. In the manufacturing process, the higher the precision level, the more stringent the requirements for processing, heat treatment (quenching, carburizing), and surface treatment (plating, nitriding), which increases the production cost. At the same time, import tariffs and transportation costs also significantly affect the final pricing, ultimately forming a price system jointly influenced by materials, technology, and the market.

Supplier of Slew bearing

In terms of product quality, LDB bearing always adheres to the attitude of striving for excellence and has established a strict quality control system. Starting from the procurement of raw materials, it strictly selects high – quality steel to ensure the basic performance of the products. Ensure that every product can meet your needs.

How to Conduct Slew bearing Diagnosis

March 29, 2025/in Bearing Knowledge /by wang

In the modern industrial system, slew bearings, as crucial components of various rotating equipment, their operating status is directly related to the overall performance and production efficiency of the equipment. Once a slew bearing fails, it may lead to equipment downtime, production interruptions, and even safety accidents. Therefore, choosing a suitable slew bearing fault diagnosis method for a specific application is of great significance. This not only helps to detect and resolve potential problems in a timely manner but also effectively reduces maintenance costs and improves the reliability and service life of the equipment.

What is the feature of Slew bearings?

Slew bearings are key components in mechanical transmission and have many distinct characteristics. Structurally, rolling slew bearings generally consist of an inner ring, an outer ring, rolling elements, and a cage, with each part working in coordination; sliding slew bearings mainly include a slew bearing housing and a slew bearing bush. In terms of performance, they can effectively reduce the friction between moving parts and improve mechanical efficiency. They also have a high load – carrying capacity and can withstand radial and axial loads. Slew bearings are available in different accuracy grades to meet the diverse requirements of equipment, from common to high – precision ones. Moreover, slew bearings have good rotational stability, ensuring the stable operation of equipment, and are widely used in various mechanical fields such as automobiles, machine tools, and motors.

Determine Strategies Based on Equipment Characteristics

The fectures of the equipment itself are the fundamental basis for choosing a diagnosis method. Regarding speed and load, slew bearing failures in high – speed equipment can cause high – frequency vibrations. The vibration analysis method, with its ability to capture high – frequency signals, is an ideal choice for such equipment. For example, in a gas turbine, where the slew bearing rotates at an extremely high speed, high – sensitivity acceleration sensors installed at key positions can collect vibration signals in real – time. Through signal processing techniques such as the Fast Fourier Transform, the vibration spectrum can be analyzed to accurately identify slew bearing fault types, such as early wear of the balls and fatigue cracks in the raceways. For heavy – load equipment, like the hoist of a large – scale mining machine, which endures huge pressure for long periods, the slew bearings are prone to problems such as wear and plastic deformation due to overloading. In this case, the combined use of the temperature monitoring method and the oil analysis method can be very effective. Temperature monitoring can promptly detect slew bearing overheating caused by excessive load, while oil analysis can detect the concentration and composition of metal particles in the oil due to wear, enabling the determination of the wear degree and location of the slew bearing.

Make Choices According to the Working Environment

The working environment significantly affects the applicability of diagnosis methods. In high – temperature environments, such as the slew bearings of blast furnace fans in the metallurgical industry, the conventional oil analysis method may produce errors due to the impact of high temperature on the oil performance. In this case, the vibration analysis method and the temperature monitoring method based on infrared technology are more reliable. Infrared thermal imagers can measure the surface temperature of slew bearings from a distance and non – contact, quickly identifying areas with abnormal temperatures. In humid or corrosive environments, such as the slew bearings of chemical equipment, the slew bearings are prone to corrosion failures. Although the visual inspection method can directly observe surface corrosion signs, it is difficult to detect internal corrosion. However, the combination of the vibration analysis method and the ultrasonic testing method can effectively make up for this deficiency. Ultrasonic waves can penetrate the slew bearing material to detect internal micro – defects and the degree of corrosion.

Select Methods According to Fault Types

Different fault types require targeted diagnosis methods. For early – stage faults, the vibration analysis method and the acoustic detection method have unique advantages. Early – stage slew bearing wear, fatigue damage, and other faults can cause weak abnormal vibrations and sound signals during slew bearing operation. Through high – resolution vibration sensors and high – sensitivity acoustic sensors, combined with advanced signal processing algorithms, these subtle changes can be captured. For example, wavelet transform can be used to decompose the vibration signal to extract early – stage fault features and achieve early – warning of faults. The oil analysis method can also play a role in early – stage detection. By analyzing the number, shape, and composition of wear particles in the oil, the wear trend of the slew bearing can be detected in advance.

The diagnosis of sudden faults relies more on methods that can respond quickly. When sudden faults such as part breakage or jamming occur in a slew bearing, the vibration analysis method will detect a sharp increase in the vibration amplitude and a mutation in the frequency components. At the same time, the temperature monitoring method can also detect an instant increase in temperature. These abnormal signals can be quickly alerted through an automated monitoring system, enabling operators to take timely measures to prevent the accident from escalating.

Make Decisions by Weighing Cost – Benefit

Cost – benefit is an important factor that enterprises must consider when choosing a diagnosis method. From the perspective of initial investment, vibration analysis equipment, high – precision oil testing instruments, etc., are expensive. For small and medium – sized enterprises with limited funds or some application scenarios with low requirements for equipment accuracy, such as the ventilation equipment in small factories, it is more practical to use the cost – effective visual inspection method and simple temperature monitoring devices. Considering maintenance costs, the oil analysis method requires regular sampling, sending for inspection, and consuming chemical reagents, which can be costly in the long run; the sensors used in the vibration analysis method need to be calibrated and maintained regularly, also incurring certain costs. Therefore, enterprises need to comprehensively consider the importance of the equipment, the potential losses caused by faults, and the maintenance budget to weigh and choose a suitable diagnosis method.

Arrange Reasonably by Referring to Personnel Skills

The skill level of personnel is also a factor that cannot be ignored. Diagnosis methods such as vibration analysis and oil analysis require professional technicians to collect, analyze, and interpret data. For enterprises lacking professional talents, complex diagnosis methods may not be effectively utilized. In this case, it is more appropriate to choose simple – to – operate and easy – to – understand methods such as visual inspection and temperature monitoring. At the same time, enterprises can improve personnel skills through internal training and external further education to gradually introduce more advanced diagnosis methods.

Select Means by Matching Diagnosis Accuracy

The requirement for diagnosis accuracy determines the level of method selection. For equipment with extremely high accuracy requirements, such as aero – engines and lithography machines, a single diagnosis method is difficult to meet the needs. It is necessary to comprehensively use multiple high – precision methods. The vibration analysis method combined with the oil analysis method, supplemented by non – destructive testing techniques such as X – ray flaw detection and ultrasonic flaw detection, can comprehensively monitor the slew bearing status from multiple dimensions to ensure the safe and reliable operation of the equipment. For general industrial equipment, such as ordinary motors and reducers, under the premise of meeting basic production requirements, relatively simple diagnosis methods can be used to ensure the diagnosis effect while reducing costs.

Determine the Method by Combining Real – Time Monitoring

The need for real – time monitoring varies according to the operating characteristics of the equipment. For key equipment that operates continuously and does not allow downtime, such as the slew bearing of the reactor agitator in a large – scale petrochemical plant, real – time online monitoring methods must be adopted, such as the vibration monitoring system based on the Internet of Things and the real – time oil monitoring system, to ensure that potential fault hazards can be detected in a timely manner. For intermittent – operation equipment, such as tower cranes on construction sites, regular inspections and detections can be carried out. Visual inspections, vibration detections, and oil analyses can be performed during equipment downtime intervals to rationally allocate monitoring resources and improve monitoring efficiency.

The accessibility of the equipment also affects the implementation of the diagnosis method. For slew bearings that are easily accessible, such as the sliding slew bearings on machine tool guides, simple methods such as visual inspection and manually feeling the temperature can be directly used for daily inspections. For slew bearings installed in enclosed spaces, at heights, or in dangerous areas, such as the main pump slew bearings of nuclear power plants, non – contact and remote – operation diagnosis methods are required. For example, robots equipped with detection equipment can be used for vibration detection, and remote infrared monitoring systems can be used for temperature monitoring to ensure the safe and efficient progress of the diagnosis work.

Choosing a suitable slew bearing fault diagnosis method for a specific application is a process of comprehensively considering multiple factors. Enterprises need to weigh the pros and cons based on factors such as equipment characteristics, fault types, cost – benefit, personnel skills, diagnosis accuracy, real – time monitoring requirements, and equipment accessibility, and make scientific decisions. When necessary, a comprehensive diagnosis strategy combining multiple methods can be adopted to achieve accurate diagnosis and effective prevention of slew bearing faults, ensuring the stable operation of equipment and enhancing the production efficiency and competitiveness of enterprises.

The Price of Slew bearings

The price of slew bearings is affected by many factors. Firstly, it is the type. Deep – groove ball slew bearings have a simple structure and a large usage volume, so their prices are affordable; tapered roller slew bearings can withstand combined loads, and their manufacturing process is complex, resulting in relatively high prices. The size specification is also crucial. Large – sized slew bearings require more materials and are difficult to manufacture. For example, large – sized slew bearings used in wind power equipment are expensive; the opposite is true for small – sized slew bearings. In addition, the higher the accuracy grade, the more stringent the processing requirements, and the more expensive the price.

Supplier of Slew bearing

LDB bearing will continue to adhere to the corporate vision of “meticulous manufacturing, serving the world”, continuously increase investment in research and development, improve product quality and technical levels, expand market areas, strengthen international cooperation, and strive towards the goal of becoming a world – class slew bearing manufacturer. It is believed that with the joint efforts of all employees of LDB slew bearing, this enterprise, which carries numerous honors and dreams, will surely write an even more glorious chapter in the industrial slew bearing field and make greater contributions to the development of the global industry.

What is the use of the four – point contact ball slewing bearing?

March 26, 2025/in Bearing Knowledge /by wang

Four-point contact ball slewing bearings are widely used and have unique performance mechanical components, playing a crucial role in many industrial fields.

What is Four-point Contact Ball Slewing Bearings

In terms of structural design, it is extremely compact. Compared with other slewing bearings, it occupies significantly less space. This characteristic creates favorable conditions for the miniaturization and lightweight design of equipment, conforming to the current industrial trend of pursuing high efficiency and intensiveness. In terms of load – bearing performance, four-point contact ball slewing bearings are outstanding. They can simultaneously withstand axial forces, radial forces, and overturning moments, and can calmly handle various complex working conditions, laying a solid foundation for the stable operation of equipment.

During operation, its slewing accuracy is extremely high. The ingenious structure of the four-point contact balls greatly ensures the smoothness of slewing, effectively reducing vibration and noise, and providing a quieter and more stable operating environment. Moreover, the friction coefficient of this slewing bearing is small. Replacing sliding friction with rolling friction not only reduces the power required for driving and improves transmission efficiency but also reduces component wear, thus greatly extending the service life and reducing equipment maintenance costs. In addition, it has a variety of installation forms, and the installation dimensions tend to be standardized. Whether it is for the initial installation or later replacement, it is very convenient, further enhancing its practicality and versatility.

Application of Four-point Contact Ball Slewing Bearings

In port container cranes, four-point contact ball slewing bearings play an irreplaceable and crucial role. The huge boom of the crane needs to slew frequently and smoothly to achieve the precise loading and unloading of containers. Relying on its high load – bearing capacity, the four-point contact ball slewing bearing can firmly support the huge weight of the boom and the axial forces, radial forces, and overturning moments generated when lifting containers. Its excellent slewing accuracy ensures that the boom can be accurately positioned every time it rotates, ensuring that the containers are placed in the designated position without error. The small friction coefficient enables the drive system to operate with low energy consumption and efficiently complete the loading and unloading tasks. The compact structural design realizes powerful functions within a limited space, laying the foundation for the overall performance improvement of the crane and facilitating the efficient operation of port logistics.

How to Extend the Service Life of Four-point Contact Ball Slewing Bearings

To extend the service life of four-point contact ball slewing bearings, it is necessary to start from multiple aspects. In the installation process, it is essential to strictly follow the standard procedures, use professional tools for accurate positioning, and ensure installation accuracy to prevent stress concentration or component misalignment caused by improper installation. During daily use, a scientific lubrication plan should be developed based on the equipment working conditions and operating hours. High – quality lubricants that are suitable for the equipment should be added on time and in sufficient quantities to reduce friction and wear between components. At the same time, closely monitor the operating status of the equipment. With the help of monitoring means such as sensors, real – time parameters such as the temperature, vibration, and noise of the slewing bearing can be obtained. Once any abnormality is detected, stop the machine immediately for troubleshooting and repair. In addition, pay attention to the storage environment of the equipment, and avoid being eroded by unfavorable factors such as humidity and corrosive gases. Through these comprehensive measures, the slewing bearing can be fully protected, effectively extending its service life.

Price of Four-point Contact Ball Slewing Bearings

The prices of four-point contact ball slewing bearings are affected by many factors. Raw materials are the foundation. Using high – quality steel, due to its better strength, toughness, and wear resistance, the cost is also higher. If inferior steel is selected, although the short – term price is low, it is prone to failures during long – term use. The complexity of the manufacturing process and the accuracy requirements are also very important. Precision processing equipment and strict quality control processes can ensure that the dimensional accuracy, surface roughness, and other indicators of the slewing bearing reach a high level, improving product performance and reliability. However, this will also increase the price. Products manufactured by simple processes may have a price advantage, but their quality and performance will be slightly inferior. The brand effect cannot be ignored. Well – known brands invest a lot in research and development, production, quality control, and after – sales service. Their products have passed long – term market tests, have a high degree of trust, and usually have higher prices. In addition, the market supply – demand relationship also affects the price. When the demand is strong and the supply is tight, the price rises; when the supply exceeds the demand, the price drops.

Supplier of Four-point Contact Ball Slewing Bearings

In the slewing bearing field, LDB Bearing is definitely a shining industry leader. Over the years, LDB Bearing has always adhered to the concept of quality first. Each four-point contact ball slewing bearing product is crafted through strict processes. From carefully selecting high – quality raw materials to ensuring high – precision production with advanced and precise processing equipment and mature technologies, every step is carried out with meticulous attention to detail. Its products have excellent load – bearing performance, can easily handle various complex working conditions, have extremely high slewing accuracy, operate smoothly, and greatly reduce the probability of equipment failures, escorting enterprise production. Moreover, LDB Bearing has a professional and efficient after – sales team that can solve problems for customers at any time and provide comprehensive technical support. Choosing LDB Bearing means choosing excellent quality and worry – free after – sales service. It is a wise choice to move towards efficient production and enhance competitiveness.

What role does the three-row roller slewing bearing play?

March 24, 2025/in Bearing Knowledge /by wang

The rollers in each row of this slewing bearing have their own functions and can bear corresponding loads respectively. This allows for precise determination of the loads on each row, greatly enhancing the overall performance and reliability. Therefore, it is widely used in heavy machinery such as bucket-wheel excavators, port cranes, and large-tonnage truck cranes, providing strong support for the normal operation of these devices and effectively promoting the development of related industries.

What is Three-Row Roller Slewing Bearings

The three-row roller slewing bearing is a key component of heavy machinery and plays an important role in the industrial field. It has a unique structure with three rows of rollers, each row bearing forces in different directions, endowing it with a strong load-bearing capacity. It can simultaneously withstand huge axial forces, radial forces, and overturning moments, which is beyond the reach of many slewing bearings. With relatively large axial and radial dimensions, it has a sturdy structure. Even under complex and harsh working conditions, it can ensure excellent stability, keeping the equipment running smoothly at all times.

Advantages of Three-Row Roller Slewing Bearings

Three-row roller slewing bearings have significant advantages in the industrial field. In terms of load-bearing capacity, its unique three-row roller design enables it to simultaneously withstand strong axial forces, radial forces, and overturning moments. This characteristic far exceeds that of similar products and can meet the high-load working requirements of heavy machinery such as port cranes and large excavators.

Regarding stability, its large axial and radial dimensions and robust structure make the equipment operate stably. Even in harsh working environments, when encountering strong winds, uneven ground, or material impacts, it can still maintain smooth operation, reducing equipment vibration and component wear, and ensuring operation safety and accuracy. Each row of rollers in it performs its own function and can accurately distribute the load, achieving efficient operation. This not only improves the performance of the slewing bearing itself but also enhances its reliability, reduces the occurrence of failures, extends the service life of the equipment, and reduces maintenance costs, saving a large amount of time and capital for enterprises and effectively ensuring the continuous and efficient operation of various types of large machinery.

Applications of Three-Row Roller Slewing Bearings

With its excellent load-bearing performance and stable characteristics, the three-row roller slewing bearing has become a “heart” component of many large mechanical devices and is widely used in multiple key fields, playing an irreplaceable role.

In the port logistics field, the three-row roller slewing bearing silently supports the busy scene. The quay container crane relies on it to easily lift, rotate, and accurately place containers weighing dozens of tons to the designated position. Behind each efficient loading and unloading operation, the slewing bearing is bearing huge axial forces, radial forces, and overturning moments, ensuring the stable operation of the crane and greatly improving the port’s cargo handling efficiency and guaranteeing the material flow of global trade.

At the mining site, the bucket-wheel excavator is the main force. Its huge body and high-intensity operation requirements make the three-row roller slewing bearing a core component. When the bucket-wheel excavator is excavating, the large bucket wheel continuously cuts the ore, and the complex forces generated are borne by the slewing bearing. With its sturdy structure and precise load distribution ability, the bucket wheel can rotate flexibly, achieving efficient continuous mining and facilitating the large-scale development of mine resources.

In the construction industry, the tower crane is an essential device for building high-rise buildings. On the tall tower body, the three-row roller slewing bearing supports the long boom. As building materials are hoisted, the boom rotates frequently. The slewing bearing works stably and reliably, ensuring the accuracy and safety of heavy object transportation and enabling the construction work to proceed in an orderly manner, witnessing the continuous renewal of the urban skyline.

In the metallurgical industry, the ladle turntable used for molten steel transfer also relies on the three-row roller slewing bearing. During the rotation of the high-temperature and heavy ladle, the slewing bearing bears great pressure and high-temperature tests, ensuring the stable transportation of molten steel and avoiding dangerous situations such as molten steel spillage, providing a solid guarantee for the continuity and safety of steel production. From ports to mines, from construction sites to metallurgical plants, the three-row roller slewing bearing promotes the steady progress of various industries with its powerful performance.

Price of Three-Row Roller Slewing Bearings

The price of three-row roller slewing bearings is affected by multiple factors. The cost of raw materials is crucial. High-quality steel such as 42CrMo and 50Mn used for manufacturing the raceways, and materials like GCr15 for the rollers, the market price fluctuations of which are directly related to the manufacturing cost of the slewing bearing. In terms of size specifications, the larger the diameter, width, and other parameters, the more materials are consumed, and the greater the processing difficulty and precision requirements, resulting in a corresponding increase in price. Different load-bearing capacity requirements lead to differences in internal structure design and manufacturing processes. High-load products require more precise processing and strict inspection procedures, and the increased costs lead to price increases. The brand effect cannot be ignored. Well-known brands usually price their products higher than ordinary brands due to their mature technology, reliable quality, and comprehensive after-sales service. The purchase quantity also affects the unit price. Bulk purchases can obtain more favorable prices due to economies of scale.

Supplier of Three-Row Roller Slewing Bearings

LDB Bearing adheres to the persistent pursuit of quality and has established a complete system integrating design, production, sales, and service. Its slewing bearing products cover a wide range, and the extensive export of three-row roller slewing bearings demonstrates its international vision and strong strength.

The Importance of Cross Roller Slewing Bearings

March 20, 2025/in Bearing Knowledge /by wang

The crossed roller slewing bearing is a high-precision and high-rigidity slewing bearing. Its rolling elements are cylindrical rollers, which are arranged vertically and crosswise in the raceway.

What is the Cross Roller Slewing Bearings

Cross roller slewing bearings have distinct features. The cross arrangement of their rollers endows them with a strong load – bearing capacity, enabling them to simultaneously withstand axial forces, radial forces, and overturning moments. This makes them suitable for heavy – load equipment. Their high – precision characteristics ensure accurate operation in precision equipment. Good rigidity effectively reduces deformation and vibration during operation. The compact design saves a great deal of space, making them suitable for scenarios with limited space. They are easy to install, with mounting holes for convenient connection. They are also easy to maintain and have a good sealing performance. High – quality materials and a reasonable structure make them highly wear – resistant and fatigue – resistant, with a long service life, which can effectively reduce usage costs.

Advantages of Cross Roller Slewing Bearings

High Load – Bearing Capacity: The cross – arranged rollers are closely distributed, which can effectively disperse the load. It can simultaneously withstand large axial forces, radial forces, and overturning moments. It is suitable for large – scale heavy – load equipment such as port cranes and wind turbines, and can stably support the operation of the equipment.

High Precision: The contact precision between the rollers and the raceway is high, and the installation precision is also easy to ensure, resulting in high slewing precision. Applied in equipment with strict requirements for precision, such as precision machine tools and robots, it can ensure processing accuracy and the accuracy of actions.

Good Rigidity: The structure of the cross rollers enhances the overall rigidity, reducing deformation and vibration during equipment operation and improving the operational stability of the equipment. It is often used in laser processing equipment, semiconductor manufacturing equipment, etc., to ensure processing quality.

Compact Design: It has a compact structure and occupies little space. It can achieve the slewing function in a limited space, improving the space utilization rate of the equipment. It is suitable for equipment with limited space, such as small – scale construction machinery and medical devices.

Easy Installation: It usually comes with mounting holes, facilitating connection with other components. The installation process is relatively simple, which can reduce installation costs and time. It has obvious advantages in some equipment that requires rapid installation and debugging.

Convenient Maintenance: The sealing and lubrication systems are reasonably designed, making maintenance and upkeep convenient. Some products have good sealing performance, which can effectively prevent the intrusion of dust and impurities, reducing the maintenance workload.

Long Service Life: High – quality materials and a reasonable structural design endow it with good wear resistance and fatigue resistance, resulting in a long service life. Under normal use and maintenance, it can reduce the frequency of equipment component replacement, lowering the usage cost.

Applications of Cross Roller Slewing Bearings

Cross roller slewing bearings play a crucial role in many fields due to their high load – bearing capacity, high precision, and compact design. In the field of industrial robots, their high precision ensures the precise positioning and movement of robotic arms, enabling robots to complete complex tasks such as the precise assembly of electronic chips. In semiconductor manufacturing equipment, they meet the high – precision motion requirements of processes such as photolithography and etching, improving the quality of chip production. In the aerospace field, their compact design and high load – bearing capacity make them suitable for various joint parts and rotating mechanisms of aircraft. They can stably support the operation of components in a limited space and withstand complex stresses. In the medical device field, in equipment such as CT and MRI, cross roller slewing bearings help the equipment achieve precise rotary scanning, providing clear and accurate images for medical diagnosis. In high – precision testing equipment, their high precision and good stability ensure the smooth operation of the testing platform, guaranteeing the accuracy of test results and promoting product quality control and scientific research progress.

Prices of Cross roller slewing bearings

The prices of Cross roller slewing bearings are affected by multiple factors. The size specification is one of the key factors. Larger – sized products are more expensive than smaller – sized ones due to higher material consumption and greater processing difficulty. The accuracy grade is also important. High – accuracy grades such as P4 and P5 are much more expensive than ordinary accuracy grades because they require higher manufacturing processes and stricter quality control. The higher the required load – bearing capacity, the more particular the design and material selection. The use of high – quality alloy steel, special heat – treatment processes, etc., increases the cost, and the price rises accordingly. In addition, the brand and after – sales service also affect the price. Well – known brands have a certain brand premium due to their investment in technology research and development, strict quality control, and good reputation. Products that provide comprehensive after – sales services such as timely maintenance and technical consultation are also priced higher.

Suppliers of Cross Roller Slewing Bearings

LDB Bearing has nearly 30 sets of various production and technical testing equipment. Its processing range covers diameters from 150mm to 4000mm, enabling the production and manufacturing of various standard – specification slewing bearings to fully meet the diverse needs of different customers. Among its nearly 60 employees, there are many experienced slewing bearing designers and technical personnel. With their professional knowledge and superb skills, they provide a solid guarantee for the high quality of the products. Choosing our products will bring you great surprises.

Why should we choose the SE series slewing drives?

March 20, 2025/in Bearing Knowledge /by wang

The SE series slewing drives demonstrate numerous outstanding advantages in the industrial field, providing strong support for the efficient operation of various mechanical equipment.

What is the feature of the SE Series Slewing Drives?

SE Series Slewing Drives possess many distinct features. They adopt worm gear drive, with a compact design that greatly saves installation space and can easily adapt to equipment with limited space. They have a high torque capacity and can simultaneously withstand large axial forces, radial forces, and overturning moments, enabling stable operation under heavy – load conditions. They also have precise rotation control capabilities, capable of achieving accurate positioning and stable speed control to meet the requirements of high – precision operations. The reverse self – locking function of the worm gear drive can prevent unexpected rotation after the power is cut off, significantly enhancing safety. The high – grade protective housing has good dust – proof, rain – proof, and corrosion – resistant properties, allowing it to adapt to various harsh environments and ensuring the long – term reliable operation of the equipment.

Advantages of the SE Series Slewing Drives?

Structural Design Advantages: The SE Series Slewing Drives are designed with extreme compactness, occupying minimal space. This feature enables them to be flexibly integrated into various equipment with strict space layout requirements. Especially in some miniaturized and precision mechanical equipment, they can achieve the slewing function within a limited space, greatly improving the space utilization rate and overall compactness of the equipment. This compact design also reduces the overall volume and weight of the equipment, making transportation and installation more convenient and reducing related costs.

Powerful Load – Bearing Capacity: Having a high torque capacity is a significant advantage of the SE series slewing drives. They can withstand huge axial forces, radial forces, and overturning moments, making them perform outstandingly in heavy – duty mechanical equipment and high – load working conditions. For example, in large – scale cranes and port loading and unloading equipment, the SE series slewing drives can stably support heavy loads and ensure the smooth operation of the equipment under various complex working conditions, providing a solid guarantee for the reliable operation of the equipment.

Precise Rotation Control: The SE series slewing drives have precise rotation control capabilities and can achieve high – precision positioning and stable speed control. Through advanced manufacturing processes and the precise cooperation of components, their tracking accuracy can reach an extremely high level, and some models can even achieve extremely small angular deviations. This advantage makes them play an irreplaceable role in industries with strict requirements for rotation accuracy, such as semiconductor manufacturing equipment, high – end CNC machine tools, and optical instruments, ensuring the processing accuracy of products and the operational stability of the equipment.

Reliable Safety Performance: The worm gear drive endows the SE series slewing drives with a reverse self – locking function, which is an important safety advantage. When the power is cut off or the equipment stops running, the drive device can automatically lock to prevent unexpected rotation caused by external forces. This feature is particularly crucial in equipment such as aerial work platforms and construction hoists, effectively avoiding safety accidents caused by uncontrolled rotation of the equipment and providing reliable protection for the safety of operators and the surrounding environment.

Excellent Protection Performance: The housing of the SE series slewing drives has a high protection level, usually reaching an IP65 protection standard or even higher. This means it has good dust – proof, rain – proof, and corrosion – resistant properties. Whether in a dusty construction site, a humid marine operation environment, or an industrial production site with corrosive chemicals, the SE series slewing drives can effectively resist the erosion of the external environment, ensure the normal operation of internal components, extend the service life of the equipment, and reduce maintenance costs.

Good Transmission Characteristics: During operation, the worm gear and worm drive of the SE series slewing drives endow it with the advantages of smooth transmission and low noise. This feature makes it widely used in equipment with high requirements for operation smoothness and noise, such as medical equipment and food processing machinery. Smooth transmission not only improves the operation quality of the equipment but also reduces equipment wear caused by vibration and noise, further enhancing the reliability and stability of the equipment.

Economic and Practical Advantages: From an economic perspective, the SE series slewing drives have significant advantages. On the one hand, they can replace some complex reducer systems, simplify the transmission structure of the equipment, and thus reduce the manufacturing cost of the main engine. On the other hand, due to their high reliability and long service life, the maintenance frequency and maintenance costs of the equipment are greatly reduced. At the same time, their efficient operation performance also helps to improve production efficiency, bringing higher economic benefits to enterprises.

Prices of the SE Series Slewing Drives?

The factors affecting the prices of the SE series slewing drives are rather complex. Product specifications and performance parameters play a key role. The larger the output torque, overturning moment, and load – bearing capacity, the higher the reduction ratio, and the more precise the tracking accuracy, the higher the price is usually. The addition of special functions will also increase costs. The quality of raw materials cannot be ignored. Using high – quality steel to manufacture core components and high – quality auxiliary materials can improve product performance and service life but will increase costs and thus raise the price. In terms of manufacturing processes and quality control, advanced and precise processing techniques and strict quality inspection procedures can ensure high – precision and reliable products. However, this will also increase production inputs, which are reflected in higher prices. In addition, the brand and after – sales service also affect prices. Well – known brands have a brand premium due to their good reputation and reliable quality, and a complete after – sales guarantee system is also included in the product pricing.

Suppliers of the SE Series Slewing Drives?

LDB Bearing is extremely strict in product quality control. In 2019, the company successfully passed the ISO 9001:2015 quality management system certification by the German TUV certification company. From the entry of raw materials into the factory to the delivery of finished products, strict process control and quality control are implemented throughout the entire production process to ensure that every product leaving the factory is of excellent quality.

Why is the flanged slewing bearing so important?

March 20, 2025/in Bearing Knowledge /by wang

Thanks to its unique structural design, the flanged slewing bearing integrates the slewing and load – bearing functions within a limited space. It is applied in many fields such as construction machinery, energy, special – purpose vehicles, port and ship, industrial automation, and robotics. It has the advantages of easy installation, precise positioning, strong load – bearing capacity, smooth operation, and good sealing performance. Moreover, it features high manufacturing precision and strong reliability.

What are the features of the flanged slewing bearing?

Flanged slewing bearing, with their unique structural design, achieve a compact layout. They can perfectly integrate the slewing motion and load – bearing functions within extremely limited space. This feature makes them widely used in equipment where space is at a premium, greatly enhancing space utilization. In terms of load – bearing capacity, through elaborate structural design and the use of strictly selected high – strength materials, they demonstrate excellent performance. They can easily handle strong axial forces, radial forces, and complex overturning moments, which is sufficient to meet the support and slewing requirements of various heavy – duty equipment under harsh working conditions.

From the perspective of precision, the manufacturing process of flanged slewing bearings is extremely strict. The processing accuracy of the raceways and rolling elements, as well as the final assembly accuracy, are all controlled within a very small error range. This enables them to maintain high – precision slewing motion during long – term and high – frequency use, laying a solid foundation for the precise processing and stable operation of equipment. In terms of reliability, high – quality materials, advanced manufacturing processes, and a reasonable internal structural design work together. Coupled with a perfect sealing and lubrication system, they can effectively resist the invasion of harsh working environments such as dust, moisture, and high temperatures, greatly reducing the probability of failures and thus significantly extending their service life.

In terms of installation and maintenance, their advantages are also prominent. The flanged is equipped with standard mounting holes. By using bolts, the slewing bearing can be quickly connected to other components of the equipment. The entire installation process is simple and efficient, which can greatly reduce the difficulty and cost of equipment installation. Moreover, due to their high degree of standardization, products of the same type and specification have good interchangeability. Once a failure occurs and maintenance or replacement is required, the operation can be completed quickly, effectively reducing equipment downtime and ensuring the continuity of production.

Flanged slewing bearings are widely used in the following fields:

Construction Machinery Field

Cranes: Truck cranes, crawler cranes, tower cranes, etc. The slewing bearing is installed between the chassis and the turntable. It withstands the huge axial forces, radial forces, and overturning moments when lifting heavy objects, ensuring the stable rotation of the turntable and enabling lifting operations in different directions.

Excavators: It is the core component for the rotation of excavators. It connects the rotating upper body to the chassis, allowing the excavator to flexibly perform operations such as excavation and loading.

Energy Field

Wind Power Generation: It is used between the hub and tower of wind turbines, on the rotating components of the main shaft and impeller, and in the yaw part of the nacelle. It withstands huge torques and axial loads, ensuring that the impeller can adjust its angle with the change of wind direction and improving power generation efficiency.

Solar Power Generation: In solar photovoltaic power generation systems, it can be used in tracking systems, enabling solar panels to rotate according to the position of the sun to obtain the best lighting angle.

Special – Purpose Vehicle Field

Concrete Pump Trucks: It plays a role in connecting the chassis and the boom of the pump truck. The boom can achieve multi – angle rotation through the slewing bearing, enabling the accurate delivery of concrete to various positions in construction sites.

Fire Trucks: In aerial ladder fire trucks, the aerial ladder is connected to the chassis of the fire truck through the slewing bearing, allowing it to rotate freely in the horizontal direction and quickly adjust to the best rescue position. The fire water cannon also uses the slewing bearing to achieve horizontal and vertical rotation, accurately spraying water to different positions at the fire scene.

Port and Ship Field

Port Cranes: Such as quay container cranes and portal cranes. The slewing bearing enables the boom or turntable of the crane to rotate 360 degrees, realizing the loading and unloading of ship cargo and improving the cargo handling capacity of the port.

Marine Cranes: Also known as floating cranes, they are installed on ships for lifting cargo or performing offshore operations. The slewing bearing ensures the stable rotation and operation of the crane on the ship, adapting to the complex working conditions at sea.

Industrial Automation and Robot Field

Industrial Robots: It is applied to the joints of welding robots, palletizing robots, handling robots, etc., enabling the arms or joints of the robots to rotate flexibly and perform various complex actions and operations, improving production efficiency and quality.

Automated Production Lines: It is used in some workbenches that require rotational motion and transfer parts of conveyor lines, realizing the accurate transfer of materials and the conversion of processing positions, and improving the degree of automation and coordination of the production line.

Flanged slewing bearings have the following advantages:

Easy Installation: The flanged is equipped with a series of bolt holes. Through bolts, the slewing bearing can be quickly fixed to other components of the equipment. The installation process is simple and efficient, which can shorten the equipment assembly time and improve the installation accuracy.

Precise Positioning: During installation, the flanged fits closely with related components, and the fitting accuracy is high. It can provide accurate positioning for the slewing components, ensuring that the axis of the slewing motion is consistent with the design requirements, which is conducive to improving the overall operation accuracy of the equipment.

Strong Load – Bearing Capacity: With a reasonable structural design, it can simultaneously withstand large axial forces, radial forces, and overturning moments, meeting the slewing support requirements of large – scale mechanical equipment such as cranes and excavators under heavy – load conditions.

Smooth Operation: The rolling elements and raceways inside are precisely matched, and the friction coefficient is small. During the slewing process, it can effectively reduce vibration and noise, and the operation is smooth, which is conducive to improving the working efficiency and service life of the equipment.

Good Sealing Performance: Usually, there are good sealing designs at the joints between the flanged and other components and inside the slewing bearing. It can effectively prevent the intrusion of dust, moisture, impurities, etc., avoiding the wear and corrosion of internal parts and ensuring the normal operation of the slewing bearing.

The Price of flanged slewing bearing?

There are many factors affecting the price of flanged slewing bearing. In terms of raw materials, using high – quality steel such as 42CrMo can improve the strength, toughness, and wear resistance of the product, but it also increases the cost. In terms of manufacturing processes, advanced and precise processing equipment and strict quality control processes can ensure that indicators such as dimensional accuracy and surface roughness reach a high level, but this will also increase the price. The size and specification of the product are also crucial. Large – sized, special – specification, or flanged slewing bearings with high load – bearing capacity requirements are difficult to produce, and their prices will also increase accordingly. Brand and manufacturer reputation cannot be ignored. Well – known brands invest a lot in research and development, production, and after – sales service. Their products are of reliable quality, and the prices are often higher. In addition, changes in market supply and demand will cause price fluctuations. When demand is strong and supply is tight, the price rises; otherwise, it falls.

Suppliers of Flanged Slewing Bearings

LDB Bearing, established in 1999, is located in Luoyang, Henan Province, a major bearing production base in China. Since its birth, it has been shining brightly in the bearing field. It is like a bright star, focusing on the design, development, manufacturing, and sales of precision slewing bearings and precision slewing drives. We have the most cost – effective sales plans for flanged slewing bearings here. If you want to purchase, please contact us.

How to Distinguish Slew Bearings of Different Precision Levels

March 20, 2025/in Bearing Knowledge /by wang

Precision grades are established according to ISO standards. However, due to variations in national standards, their nomenclature may differ significantly.

What is slew bearing?

Slew Bearings can significantly reduce the friction between mechanical components, making the operation smooth and reducing energy consumption. They have a strong load – bearing capacity and can handle axial and radial loads. With high precision, they ensure the stable operation of equipment, can adapt to complex working conditions such as high temperature and high speed, and are extremely widely applied.

Basic Classification of Slewing Bearings

The precision grades of bearings are primarily classified based on dimensional accuracy and rotational accuracy. These grades are standardized into six levels: 0, 6X, 6, 5, 4, and 2, with precision increasing sequentially from grade 0. Details are as follows:

Grade 0: Widely used in general bearing systems with rotational accuracy greater than 10 μm, such as gearboxes and feed mechanisms in ordinary machine tools, automotive and tractor transmissions, general-purpose motors, pumps, and agricultural machinery.

Grades 6 and 5: Suitable for bearing systems requiring rotational accuracy between 5–10 μm or higher speeds, such as the front support (grade 5) and rear support (grade 6) of lathes, precision instruments, and high-precision rotating mechanisms.

Grades 4 and 2: Used in ultra-precision systems with rotational accuracy below 5 μm or extremely high speeds, such as precision coordinate boring machines, gear systems in precision grinders, high-precision instruments, and high-speed cameras.

Application Scenarios for Different Bearing Types by Precision Grade

Deep Groove Ball Bearings.P0: General industrial equipment (e.g., motors, fans, pumps, reducers) with low precision and speed requirements. P6: Automotive engines, wind turbines, precision pumps—suitable for moderate speed and precision. P5 and above High-speed turbines, industrial robots, and other high-speed, precision equipment.

Angular Contact Ball Bearings P0: Ordinary rotating mechanisms with low precision demands.P6: Machine tool spindles, high-speed motors—enhances precision.P5: Precision machine tools, optical instruments—ensures high rotational accuracy and rigidity. P4 and above: Aerospace, semiconductor manufacturing—extremely high precision and speed.

Self-Aligning Ball Bearings. P0: Motors, agricultural machinery, automotive transmissions—tolerates moderate misalignment.P6 and above**: Precision instruments requiring stability.

Self-Aligning Roller Bearings P0: Heavy machinery (e.g., crushers, vibrating screens, paper mills)—handles large radial and axial loads.P6 and above: High-precision equipment (e.g., rolling mills)—ensures stability and reliability.

Tapered Roller Bearings.P0: Automotive transmissions, rear axles, general engineering machinery.P6: Machine tool feed systems with moderate precision needs. P5 and above: Aerospace, precision machine tool spindles—high precision and load capacity.

Cylindrical Roller Bearings.P0: Industrial conveyors (e.g., belt conveyor rollers).P6 and above: High-precision grinding machine spindles, CNC machine lead screw supports.

Thrust Ball Bearings.P0 Low axial load applications (e.g., small power tools). P6 and above: Precision lathe lead screws—high axial accuracy.

Thrust Roller Bearings.P0: Heavy machinery (e.g., cranes, rolling mills)—axial support.P6 and above**: Aerospace engines, precision coordinate boring machines—extreme axial accuracy and load capacity.

Impact of Bearing Precision Grade

Performance Effects

Rotational Accuracy: Higher grades reduce rotational runout (e.g., high-precision spindles in machine tools).

Friction Characteristics: Smoother surfaces and tighter tolerances minimize friction and heat, ideal for high-speed systems.

Stiffness: Enhanced dimensional accuracy ensures stable stiffness (e.g., aerospace engine bearings).

Lifespan Effects

Load Distribution: Higher precision reduces stress concentration, extending lifespan (e.g., large motors).

Wear and Fatigue Reduced sliding and friction slow wear and fatigue (e.g., precision grinder spindles).

Sealing and Lubrication: Tight tolerances improve sealing and lubrication retention, prolonging service life.

When selecting bearings, there are the following considerations:

Lubrication and Heat Dissipation: For high-speed rotating bearings, in addition to choosing the appropriate bearing type, the lubrication method and heat dissipation measures need to be considered. For example, using mist lubrication or jet lubrication can effectively reduce the temperature of high-speed bearings. At the same time, selecting a lubricating oil with low viscosity and high flash point also helps to reduce heat generated by friction.

Accuracy Matching: When selecting the bearing accuracy, it should be matched with the overall accuracy requirements of the equipment. For example, in a high-precision grinder, the spindle bearing needs to be selected with P4 class or higher accuracy, while the feed shaft bearing may meet the requirements with P5 or P6 class.

Application Scenarios: Self-aligning bearings are often used in situations where it is difficult to ensure the coaxiality of the two bearing seat holes, such as long shaft transmissions and equipment with unstable installation bases. In large mechanical equipment such as mining machinery and metallurgical equipment, self-aligning roller bearings are widely used, which can effectively compensate for the shaft deflection caused by equipment deformation or installation errors. Working Environment

Temperature Range: Determine the ambient temperature range in which the bearing operates. For high-temperature environments, select high-temperature-resistant bearing materials such as ceramic ball bearings and special alloy bearings, and use high-temperature-resistant grease. For low-temperature environments, choose grease with good low-temperature performance to ensure good lubrication and starting performance of the bearing at low temperatures.

Chemical Corrosion: In environments with chemical corrosive media, such as in the chemical and electroplating industries, select stainless steel bearings or bearings with anti-corrosion surface treatment, and use anti-corrosion grease. In addition, sealing measures can be taken to prevent corrosive media from entering the bearing interior.

Price of Bearings by Precision Grade

Prices vary based on type, brand, and specifications. For example: Deep Groove Ball Bearings: P0 (lowest cost) to higher grades (more expensive). Angular Contact Ball Bearings: Higher precision grades incur higher costs due to manufacturing complexity. Imported brands, special materials, and large-sized bearings also command premium pricing.

Supplier of Slewing Bearings

For purchasing guidance, consult LDB-Bearing, a supplier offering diverse bearing types (e.g., slewing rings, cross roller bearings, cylindrical roller bearings). Consider application-specific requirements (e.g., construction machinery, wind energy, automotive) to determine the optimal bearing type, size, and precision grade.

The Influence on Materials of Slewing Bearing

What is the slewing bearing of a CT scanner?

Why Slew bearings Are So Important?

How to Conduct Slew bearing Diagnosis

What is the use of the four – point contact ball slewing bearing?

What role does the three-row roller slewing bearing play?

The Importance of Cross Roller Slewing Bearings

Why should we choose the SE series slewing drives?

Why is the flanged slewing bearing so important?

How to Distinguish Slew Bearings of Different Precision Levels

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