Posts

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

/in /by

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

What is Double – Row Ball Slewing bearing?

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

What is Four – Point Contact Slewing bearing?

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

Load – Bearing Capacity of Slewing bearings

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

Slewing Accuracy of Slewing bearings

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

Friction Characteristics of Slewing bearings

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

Service Life of Slewing bearings

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

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

Prices of Slewing bearings

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

Suppliers of Slewing bearings

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

How to Maintain Double-row Ball Slewing bearings

/in /by

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

What is Double-row Ball Slewing bearing?

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

Methods for Maintaining Double-row Ball Slewing Rings

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

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

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

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

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

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

The Price of Double-row Ball Slewing bearings

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

Suppliers of Double-row Ball Slewing bearings

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

How to Select a Double Row Ball Slewing Bearing

/in /by

In the operation of numerous mechanical devices, the double row ball slewing bearing plays a crucial role, directly influencing the performance, stability, and service life of the equipment. To choose a suitable double row ball slewing bearing, it is necessary to comprehensively consider multiple factors.

What is Double Row Ball Slewing Bearing?

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

Key Factors in Selecting a Slewing Bearing

The double row ball slewing bearing needs to withstand axial forces, radial forces, and overturning moments. It is necessary to accurately calculate various loads generated during the operation of the equipment and determine the load – carrying capacity requirements of the slewing bearing according to the actual working conditions. For example, when a large – scale crane is lifting heavy objects, the slewing bearing not only has to bear the gravity of the heavy objects (radial force), but also has to cope with the overturning moment generated by the rotation of the boom. If the load – carrying capacity is insufficient, the slewing bearing is prone to premature wear, deformation, or even failure. Excessive load – carrying capacity will increase costs and cause waste of resources. When calculating, relevant formulas in mechanical design manuals can be referred to, and accurate calculations can be carried out by combining parameters such as the equipment’s working class, maximum lifting capacity, and slewing radius.

Accuracy is equally important. Different devices have significantly different accuracy requirements for slewing bearings. Equipment such as precision machine tools and robots require slewing bearings to have extremely high rotational accuracy to ensure the accuracy of processing or operation. For some ordinary construction machinery with relatively low accuracy requirements, such as small loaders, the accuracy requirements are not so strict. The accuracy of slewing bearings mainly includes indicators such as radial run – out, axial run – out, and end – face run – out. When selecting, it is necessary to choose products that meet the corresponding accuracy levels according to the accuracy requirements of the equipment. Generally, the higher the accuracy level, the higher the price. Therefore, it is necessary to reasonably select the accuracy level on the premise of meeting the equipment’s usage requirements.

Speed limits also need to be carefully considered. Each double row ball slewing bearing has its allowable maximum speed. If the actual working speed of the equipment exceeds the limit speed of the slewing bearing, it will lead to increased friction and severe heat generation, thus shortening the service life of the slewing bearing and even causing malfunctions. When selecting, it is necessary to clarify the normal working speed range of the equipment and ensure that the maximum speed of the selected slewing bearing is greater than the working speed of the equipment. At the same time, the impact of speed changes on the slewing bearing, such as the impact during start – up and shutdown, also needs to be considered. For working conditions with high speeds, slewing bearings with good lubrication performance and lightweight rolling elements can be selected.

The size specification is the basis for selection. It is necessary to determine the outer dimensions of the slewing bearing, including the outer diameter, inner diameter, and width, according to the structure and installation space of the equipment. At the same time, details such as the position, size, and number of installation holes also need to be considered to ensure that the slewing bearing can be perfectly adapted to the equipment. If the size is too large or too small, it cannot be installed and used normally. In the design stage, sufficient installation space for the slewing bearing should be fully considered and reserved. When selecting, the size parameters of the product should be carefully checked to avoid installation problems.

The sealing and lubrication conditions are directly related to the service life of the slewing bearing. Good sealing can effectively prevent the intrusion of dust, impurities, and moisture, avoiding the wear and corrosion of the rolling elements and raceways. Common sealing methods include rubber seals and labyrinth seals. The appropriate sealing form should be selected according to the working environment of the equipment. In dusty and humid environments, rubber seals with good sealing performance should be selected and regularly inspected and replaced. In clean and dry environments, labyrinth seals may be sufficient to meet the requirements. In terms of lubrication, it is necessary to ensure that the slewing bearing is well – lubricated to reduce friction and wear. Different types of slewing bearings have different requirements for lubricants. Appropriate lubricants should be selected according to the product instructions and added or replaced regularly.

The material quality determines the performance and reliability of the slewing bearing. Common materials for slewing bearings include high – quality carbon steel and alloy steel. High – quality materials have characteristics such as high strength, high hardness, good wear resistance, and corrosion resistance. When selecting, attention should be paid to the quality of the materials and the heat treatment process. Materials subjected to appropriate heat treatment can further improve their comprehensive performance. For slewing bearings used in harsh working conditions, such as high – temperature, heavy – load, and strong – corrosion environments, special materials or products with surface treatment, such as carburized and quenched alloy steel, should be selected to improve their performance and service life.

The manufacturing process affects the quality and accuracy of the slewing bearing. Advanced manufacturing processes can ensure the dimensional accuracy, surface quality, and assembly quality of the slewing bearing. When selecting, it is necessary to understand the manufacturing process level of the manufacturer, such as the advancement of processing equipment, the standardization of the production process, and the perfection of the quality control system. The manufacturing process can be evaluated by visiting the manufacturer, checking product samples, and understanding user reviews. Products processed by numerical control machine tools, assembled automatically, and strictly quality – tested are more reliable in quality and more stable in performance.

The Price of Double Row Ball Slewing Bearings

There are many factors affecting the price of slewing bearings. Firstly, raw materials. High – quality steel has a high cost, and products made from it have excellent performance and a long service life, so the price is also high. Secondly, slewing bearings with complex manufacturing processes and high – precision requirements require advanced equipment and strict quality control, so the price will also increase accordingly. Moreover, the larger and more special the size and specifications are, the greater the processing difficulty and material consumption, and the higher the price. Brands and manufacturers’ reputations are also crucial. 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 also on the high side. Finally, the market supply – and – demand relationship affects the price. When the demand is strong and the supply is tight, the price rises; otherwise, it falls.

Suppliers of Double Row Ball Slewing Bearings

In terms of quality control, ldb bearing company does an excellent job. Every link from the incoming of raw materials to the outgoing of finished products is strictly controlled. Raw materials are multi – dimensionally tested to ensure their quality compliance. During the production process, every processing step is strictly inspected, and detailed records are kept. Before the finished products leave the factory, comprehensive performance tests are carried out, and only products that fully meet the standards can enter the market.