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Benefits of Using Four-Point Contact Slewing Bearings

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Four-point contact slewing bearings are widely used in many mechanical fields. This is due to a series of significant advantages brought about by their unique structural design, covering key aspects such as load-bearing capacity, space utilization, rotation accuracy, and cost-effectiveness.

What is Four-Point Contact Slewing Bearing?

The four-point contact slewing bearing is a special type of slewing bearing. Its raceways are in a special arc shape, and there are four contact points between the rolling elements and the inner and outer ring raceways, hence the name. This design enables it to withstand large axial forces and overturning moments, and it also has a certain radial load-bearing capacity. Compared with other slewing bearings, the four-point contact slewing bearing has a compact structure and occupies less space. It is often used in equipment such as aerial work platforms and small cranes. In limited installation spaces, it enables the rotating parts of the equipment to rotate flexibly and stably, helping the equipment to position accurately and operate efficiently, and providing key support for the safe and stable operation of related machinery.

Features of Four-Point Contact Slewing Bearings

Four-point contact slewing bearings perform outstandingly in terms of load-bearing capacity. Each steel ball of it has four contact points with the inner and outer ring raceways. This special structure allows it to simultaneously bear large axial forces, radial forces, and overturning moments. When a port crane is operating and needs to frequently lift and transport heavy goods, the four-point contact slewing bearing can evenly distribute these complex loads to each contact point, effectively reducing the force on a single contact point. Compared with other types of slewing bearings under the same size and material conditions, the four-point contact slewing bearing can bear a greater load. This means it can support the operation of larger and heavier equipment, ensuring that the crane can still work stably and reliably when fully loaded, and greatly enhancing the lifting capacity and operation safety of the equipment.

In terms of space utilization, four-point contact slewing bearings have prominent advantages. Their compact structure takes up little space, making them especially suitable for equipment with strict space requirements. Take industrial robots as an example. The joint parts of robots need to achieve flexible rotation and precise positioning within a limited space. The four-point contact slewing bearing can provide stable support and efficient rotation functions for robot joints without taking up too much space. This not only makes the structural design of the robot more compact and reasonable but also improves the movement flexibility and work efficiency of the robot, enabling it to complete complex tasks in a narrow working environment.

Rotation accuracy is an important indicator for measuring the performance of slewing bearings, and four-point contact slewing bearings perform well in this regard. Due to their four-point contact structure, the contact between the steel balls and the raceways is more stable, which can effectively reduce shaking and deviation during the rotation process. In high-precision optical equipment, such as the slewing device of an astronomical telescope, the requirement for rotation accuracy is extremely high. Even a slight deviation may affect the observation effect. The four-point contact slewing bearing, with its good accuracy retention, can ensure that the telescope maintains a highly accurate pointing when tracking celestial movements, providing clearer and more accurate observation data for researchers. In semiconductor manufacturing equipment, the four-point contact slewing bearing also plays a key role in ensuring the positioning accuracy and processing accuracy of workpieces during precision processing, meeting the strict requirements of the semiconductor industry for high-precision manufacturing.

From the perspective of cost-effectiveness, four-point contact slewing bearings have a high cost-performance ratio. Although their initial purchase cost may be relatively high, considering long-term use, they can save a large amount of costs for users. Due to their strong load-bearing capacity and compact structure, they can reduce the overall volume and weight of the equipment, thereby reducing the manufacturing cost of the equipment. At the same time, their good rotation accuracy and reliability reduce the maintenance cost and downtime of the equipment. In some continuous-production industrial fields, such as automotive manufacturing production lines, equipment downtime for maintenance will cause huge economic losses. The low failure rate and long service life of four-point contact slewing bearings can effectively avoid production interruptions caused by equipment failures, improve production efficiency, and create greater economic benefits for enterprises.

In addition, four-point contact slewing bearings have strong versatility and can adapt to a variety of different working environments and working conditions. Whether in harsh natural environments such as high temperature, low temperature, and humidity, or in special industrial environments such as dusty and corrosive media, by selecting appropriate materials and surface treatment processes, four-point contact slewing bearings can maintain stable performance. In high-temperature furnace equipment in the metallurgical industry, four-point contact slewing bearings made of high-temperature-resistant materials can operate normally in high-temperature environments; in chemical reaction kettle equipment, four-point contact slewing bearings with special anti-corrosion treatments can resist the erosion of corrosive media, ensuring the long-term stable operation of the equipment.

With the continuous progress of science and technology and the rapid development of industry, the requirements for the performance of mechanical equipment are getting higher and higher. Four-point contact slewing bearings, with their unique advantages in load-bearing capacity, space utilization, rotation accuracy, and cost-effectiveness, will be widely applied and further developed in more fields. In the future, with the continuous innovation of materials science and manufacturing processes, four-point contact slewing bearings are expected to further enhance their performance and provide more solid technical support for the development of various industries.

Prices of Four-Point Contact Slewing Bearings

There are many factors that affect the price 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, 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 Four-Point Contact Slewing Bearings

Ldb bearing company offers a wide range of products. With a processing diameter ranging from 150mm to 4000mm, it can manufacture both standard and non-standard slewing bearings with high quality to meet the diverse needs of different customers. Its products are widely used in multiple fields, demonstrating its strong capabilities. Advanced production and testing equipment are the foundation of high-quality products. Ldb bearing company deeply understands this and is equipped with nearly 30 sets of various types of equipment, 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, to address the balance between the load-bearing capacity and accuracy of large-scale slewing bearings, the team conducted repeated tests and simulation analyses and finally found an innovative solution, significantly improving product performance.

How to Solve the Failure of Four-Point Contact Slewing Bearings

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There are various methods to deal with the failure of four-point contact slewing bearings. It is essential to strictly control the materials, optimize the processing technology, handle emergencies when fractures occur, analyze the causes for improvement, and ensure the quality and installation accuracy when replacing components.

What is Four-Point Contact Slewing Bearing

The four-point contact slewing bearing is a type of bearing structure. It consists of components such as an inner ring, an outer ring, rolling elements, and a cage. Its uniqueness lies in that the rolling elements have four-point contact with the raceways of the inner and outer rings, enabling it to simultaneously withstand axial forces, radial forces, and tilting moments. This design gives the slewing bearing a high load-carrying capacity and rotational accuracy within a limited space. It is commonly used in construction machinery and large-scale equipment such as cranes, excavators, and wind turbines. It can achieve smooth rotational motion between components, adapt to complex working conditions, and improve the reliability and stability of the equipment.

Different Solutions for Four-Point Contact Slewing Bearings

Wear

– Strengthen Lubrication Management: Strictly follow the equipment’s operation manual to develop a scientific and reasonable lubrication plan. Select appropriate lubricants according to the working environment and operating conditions of the slewing bearing. For example, in high-temperature environments, high-temperature-resistant synthetic grease can be used, and in dusty environments, grease with good sealing and anti-pollution capabilities can be selected. At the same time, ensure that the lubrication frequency and quantity are accurate. Insufficient lubrication cannot effectively reduce friction, while excessive lubrication may cause waste and pollution.

– Precise Installation and Adjustment: When installing the slewing bearing, professional measuring tools and equipment must be used to precisely control the installation accuracy. For example, high-precision theodolites and levels are used to adjust the concentricity and perpendicularity of the slewing bearing, keeping the deviation within the allowable range. During the operation of the equipment, regularly check the installation accuracy and adjust it in a timely manner if there is any deviation to avoid aggravated local wear caused by installation problems.

– Timely Replacement of Worn Components: Establish a perfect wear monitoring mechanism. Evaluate the degree of wear by measuring parameters such as the dimensions and surface roughness of the raceways and steel balls. When the raceway wear exceeds the specified tolerance, or when there are obvious wear marks and dimensional changes on the surface of the steel balls, decisively replace the slewing bearing or relevant worn components. At the same time, when replacing, pay attention to selecting products with reliable quality and matching the original components.

Fatigue Spalling

– Scientific Selection and Design: In the equipment design stage, accurately calculate and analyze the operating conditions of the slewing bearing, such as working load, rotational speed, and operating time. Based on these data, refer to relevant design standards and manuals to reasonably select the model and specifications of the slewing bearing to ensure that it has sufficient load-carrying capacity and fatigue life. In addition, the anti-fatigue performance can be improved by optimizing the design structure, such as increasing the curvature radius of the raceway and improving the quality of the steel balls, to reduce the contact stress.

– Comprehensive Detection and Prevention: Establish a regular comprehensive inspection system. In addition to using non-destructive testing techniques such as magnetic particle inspection and ultrasonic testing to detect fatigue cracks, it is also possible to judge whether there are signs of fatigue spalling by observing the operating state of the slewing bearing, such as abnormal vibration and noise. For the slewing bearings of some key equipment, online monitoring technology can be used to monitor their working conditions in real time and discover potential problems in a timely manner.

– Stable Operation and Maintenance: During the operation of the equipment, try to keep the operating parameters stable and avoid frequent starting, braking, and large-amplitude load changes. At the same time, regularly maintain the slewing bearing, such as cleaning the surfaces of the raceways and steel balls and replenishing lubricants, to reduce the impact of external factors on its fatigue performance.

Plastic Deformation

– Strict Load Control: During the use of the equipment, it is necessary to strictly operate according to the rated load of the slewing bearing and it is strictly prohibited to operate overloaded. In the equipment design stage, reliable overload protection devices such as pressure sensors and limit switches should be installed. When the load exceeds the set value, the equipment will automatically stop running or take corresponding protective measures.

– Optimize the Operation Process: Optimize the starting and braking processes of the equipment through advanced control technologies and equipment to make them more stable. For example, frequency conversion speed regulation technology can be used to achieve soft starting and soft braking of the motor, reducing the impact current and impact force during starting and braking. In addition, buffer devices such as elastic couplings and fluid couplings can be installed in the transmission system of the slewing bearing to further reduce the impact load.

– Deformation Assessment and Repair: Once plastic deformation of the slewing bearing is found, the equipment should be stopped immediately, and a detailed assessment of the deformation should be carried out. Analyze the impact degree of the deformation on the performance of the slewing bearing by measuring parameters such as the size and shape of the deformation. For slight plastic deformation, cold correction or hot correction methods can be used for repair, but strict quality inspection is required after repair. For severe plastic deformation, it is usually necessary to replace the slewing bearing or relevant components.

Corrosion

– Efficient Surface Protection: Effective surface protection treatment of the slewing bearing is a key measure to prevent corrosion. Appropriate surface protection methods can be selected according to different working environments. For general industrial environments, anti-corrosion paint spraying can be used. Select paints with good corrosion resistance and adhesion and construct strictly in accordance with the spraying process requirements. For some harsh corrosive environments, such as humid seashores or chemical workshops, metal plating methods such as galvanizing and chrome plating can be used to improve the corrosion resistance of the slewing bearing.

– Environmental Optimization and Control: Try to improve the working environment of the slewing bearing. Install the equipment in a dry and well-ventilated place to avoid exposure to humid, corrosive gas or liquid environments. For some unavoidable harsh environments, corresponding protective measures can be taken, such as installing dehumidification equipment and ventilation ducts to reduce the humidity and concentration of corrosive media in the environment.

– Regular Maintenance and Treatment: Establish a regular inspection and maintenance system. Regularly check the surface condition of the slewing bearing, and promptly clean the dirt, dust, and corrosion products on the surface. For slightly corroded parts found, methods such as grinding and rust removal can be used for treatment, and then re-protect. For severely corroded parts, timely repair or replacement of components is required to prevent further corrosion expansion.

Fracture

– Strict Material Control: When purchasing a slewing bearing, strictly review the qualifications of the supplier and the material quality certification documents to ensure that the purchased slewing bearing is made of high-quality materials. At the same time, random inspections of the materials can be carried out, such as chemical composition analysis and mechanical property testing, to verify whether the material quality meets the requirements. For important slewing bearings, the supplier can also be required to provide a material flaw detection report to ensure that there are no internal defects in the materials.

– Optimize the Processing Technology: In the processing process of the slewing bearing, optimize each processing technology link, especially the heat treatment process. By reasonably controlling parameters such as heating temperature, holding time, and cooling rate, eliminate processing stress, and improve the uniformity of the material structure and its strength and toughness. In addition, strictly control the surface quality during the processing process to avoid defects such as tool marks and scratches, which may become the origin of fractures.

– Emergency Treatment and Improvement: Once a fracture accident occurs, immediately take emergency measures, stop the equipment operation, set up safety warning signs to prevent the accident from expanding. At the same time, conduct a detailed analysis of the fractured components. Through methods such as fracture surface analysis and material inspection, find out the cause of the fracture. According to the analysis results, take corresponding improvement measures, such as changing materials, improving the processing technology, and optimizing the equipment structure, to prevent similar fracture accidents from occurring again. When replacing the fractured components or the entire slewing bearing, ensure that the quality and installation accuracy of the new components meet the requirements.

Prices of Four-Point Contact Slewing Bearings

Materials are a crucial factor. Using high-quality steel and special alloys can enhance strength and wear resistance. This increases the cost, and thus the price will be higher. For example, slewing drives made of materials containing special alloys are more expensive than those made of ordinary materials. Machining accuracy is also important. High-precision machining requires advanced equipment and technologies, which increases the cost, and as a result, the product price is naturally higher. The slewing drives used in precision equipment generally have high prices. The manufacturing process also affects prices. Advanced processes can optimize performance but also increase costs, thereby raising the selling price.

Suppliers of Four-Point Contact Slewing Bearings

LDB bearing company has risen from obscurity to become well-known in the industry, relying on its dedication to quality and pursuit of innovation. The company is located in Luoyang, Henan Province, where the bearing industry is developed, enjoying the advantages of industrial resources. For example, its self-developed straight-tooth slewing drives have high precision and strong stability, greatly improving the accuracy and efficiency of industrial robots. With high-quality products and attentive services, it has won numerous praises and is bound to create more glories in the future!

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

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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.