Key Points of Slew bearing Storage

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In the industrial field, slew bearings, as crucial components of various mechanical equipment, their performance and quality directly affect the operating efficiency and stability of the equipment. However, many people often overlook the important link of slew bearing storage. A reasonable storage method can effectively maintain the performance of slew bearings, extend their service life, and reduce unnecessary economic losses.

What is a Slew bearing

The design of slew bearings is full of wisdom and ingenuity. With a simple yet sophisticated structure, the inner ring, outer ring, rolling elements, and cage work together to convert sliding friction into rolling friction, minimizing the resistance to motion. This is not only a great innovation in mechanical engineering but also the ultimate pursuit of efficient operation, enabling equipment to achieve maximum value with minimum energy consumption.

Stringent Control of the Storage Environment

The ideal temperature range for slew bearing storage is between 10°C and 25°C. If the temperature is too high, it will accelerate the oxidation and deterioration of the lubricating grease on the slew bearing surface. For example, when the temperature exceeds 35°C, the chemical structure of the grease will gradually change, resulting in a decrease in its viscosity and a significant reduction in lubrication performance. This will not only increase the wear of the slew bearing during subsequent use but may also cause abnormal noise and vibration. Conversely, a too-low temperature is also extremely harmful. In an environment close to 0°C or even lower, the metal material of the slew bearing becomes brittle and its toughness decreases. Once subjected to external impact, even a slight collision, it is very likely to cause cracks on the slew bearing surface, seriously affecting its structural integrity and performance. Moreover, frequent temperature fluctuations cannot be ignored. They will cause internal stress due to inconsistent thermal expansion and contraction of different components inside the slew bearing. Over time, this will lead to a decrease in slew bearing accuracy and even deformation.

Strict Control of Humidity

A relative humidity of 40% – 60% is the optimal humidity condition for slew bearing storage. When the humidity is too high, exceeding 60%, water vapor in the air is likely to condense into small water droplets on the slew bearing surface. These seemingly insignificant water droplets can undergo an electrochemical corrosion reaction with the metal material of the slew bearing, causing rust on the slew bearing surface in a short period. This is especially prominent in coastal areas or during the plum rain season, where extra vigilance is required. When the humidity is lower than 40%, electrostatic phenomena are likely to occur. Static electricity can attract dust and small particles in the surrounding environment. Once these impurities adhere to the slew bearing surface or enter its interior, they will exacerbate wear during the operation of the slew bearing, greatly shortening its service life.

The Ultimate Pursuit of Cleanliness

The storage environment must be kept highly clean, away from dust, oil, and other pollutants. Although dust particles are small, they can cause severe friction with components such as rolling elements and raceways during the operation of the slew bearing, resulting in surface scratches and wear, and thus seriously affecting the accuracy and performance of the slew bearing. The warehouse for storing slew bearings should be regularly and thoroughly cleaned. The floor is preferably paved with dust – proof materials, and high – efficiency air filtration equipment should be installed to minimize the dust content in the air. The harm of oil to slew bearings is also significant. It will not only contaminate the lubricating grease on the slew bearing surface, reducing the lubrication effect, but may also react chemically with the slew bearing metal, causing corrosion. Therefore, operations that may generate oil, such as mechanical equipment maintenance, oil storage, and handling, should be prohibited in the storage area. If it is unavoidable, reliable isolation measures must be taken.

Pay Attention to the Details of Packaging Protection

The original packaging equipped when the slew bearing leaves the factory plays an irreplaceable role. The original packaging is carefully designed to not only effectively prevent moisture and dust but also buffer external impacts during transportation and storage, protecting the slew bearing from damage. The original packaging of high – precision slew bearings usually has a special sponge or foam lining inside, which can tightly wrap the slew bearing to prevent it from shaking inside the package. Before the slew bearing is used, it is necessary to properly protect the integrity of the original packaging and never remove it casually. At the same time, regularly check whether the original packaging is damaged or damp. If the original packaging is slightly damaged, it should be promptly sealed and repaired with tape. If it is severely damp, the packaging needs to be replaced, and the slew bearing should be carefully inspected to see if it has been affected.

Scientific Selection of Placement Methods

Slew bearings should always be placed horizontally. This is because the internal structure of the slew bearing is optimized based on the horizontal stress state during design. If it is hung vertically, the rolling elements and raceways of the slew bearing will be affected by uneven gravity. Over time, the raceway may deform, affecting the rotational accuracy of the slew bearing. For large – sized slew bearings, horizontal placement can also avoid local pressure concentration caused by their own excessive weight, preventing dents or deformations on the slew bearing surface. At the same time, regardless of the size of the slew bearing, it should be avoided to stack them too high. The stacking layer of small – sized slew bearings should not exceed 5 layers, that of medium – sized slew bearings should not exceed 3 layers, and large – sized slew bearings should be placed in a single layer as much as possible. If multi – layer storage is required, special shelves or pallets should be used, and ensure that there is sufficient support and spacing between each layer.

Clear Management of Classified Storage

Slew bearings of different models and specifications must be stored separately and clearly marked. They can be classified according to parameters such as the inner diameter, outer diameter, and type of the slew bearing. Slew bearings of the same model are stored in the same area, and information such as the model, specification, and quantity should be marked on the shelves or storage containers. This not only facilitates quickly and accurately finding the required slew bearings when needed but also avoids incorrect use caused by confusion. At the same time, new slew bearings, used slew bearings, and slew bearings with quality problems should be strictly stored separately. Used slew bearings may have potential problems such as wear and fatigue. Mixing them with new slew bearings is likely to cause misapplication. Slew bearings with quality problems should never be mixed with qualified products. They should be stored separately and clearly marked to prevent them from entering the normal use link.

Meticulous Appearance Inspection

It is recommended to conduct an appearance inspection of the stored slew bearings once a month. Carefully check whether there are any abnormal conditions on the slew bearing surface, such as rust, discoloration, scratches, and deformation. Rust is the most common problem. Once rust spots are found on the slew bearing surface, the cause should be immediately analyzed and corresponding rust – removal and anti – rust measures should be taken. Discoloration may be caused by the deterioration of the lubricating grease, high temperature, or chemical erosion. It is necessary to further check the internal condition of the slew bearing. Scratches and deformations will directly affect the performance of the slew bearing. If found, it is necessary to evaluate their impact on use and decide whether to repair or scrap the slew bearing.

Indispensable Rotation Inspection

For slew bearings stored for a long time, a rotation inspection should be carried out every three months or so. Slowly and evenly rotate the slew bearing to feel whether its rotation is smooth and whether there are any abnormal phenomena such as jamming or abnormal noise. The rotation inspection can prevent the internal parts of the slew bearing from sticking or seizing due to long – term immobility, ensuring that it can operate normally when in use. If the slew bearing is found to rotate unevenly or make abnormal noises during the rotation inspection, stop rotating immediately and conduct a comprehensive inspection of the slew bearing. It may be caused by reasons such as dry lubricating grease, rust or damage of internal parts. It is necessary to take corresponding measures according to the specific situation, such as replenishing lubricating grease, rust – removal, repair, or replacement of parts.

Slew bearing storage is a task that requires great attention to details. From the strict control of the storage environment, the careful handling of packaging protection, to the reasonable planning of the storage method and the effective establishment of a regular inspection mechanism, each link is closely connected and jointly determines the quality and service life of the slew bearing. Only by following scientific storage methods can we ensure that the slew bearing can perform optimally when needed and provide a solid guarantee for the smooth progress of industrial production.

The Price of Slew bearings

The price of slew bearings is affected by many factors. The material is the foundation. Ordinary carbon steel is affordable, while special materials such as ceramics and stainless steel have higher costs due to their outstanding performance and complex processing. Precision is also crucial. Ordinary precision can meet the requirements of general equipment, while high – precision grades are used in high – end fields. The manufacturing process is strict, and the price naturally rises. Custom – made slew bearings cost much more than conventional ones due to special specifications and performance requirements.

Supplier of Slew bearing

Since its establishment in 1999, LDB bearing has been rooted in Luoyang, Henan, a slew bearing production base in China. With the unique industrial environment and its own unremitting efforts, it has gradually grown into a comprehensive enterprise integrating design, development, manufacturing, and sales. After more than two decades of trials and tribulations, LDB slew bearing has always adhered to its original intention, committed to providing high – quality slew bearing products to global customers. It has stood out in the fierce market competition and won wide recognition and trust.

What is the feature of VE Series Slewing Drive?

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The VE series slewing drive is a star product in the field of mechanical transmission, boasting numerous remarkable advantages. It features a compact structure, ingeniously integrating components such as worms, worm gears, and drives. With a vertical structure and enclosed design, it significantly saves installation space and effectively protects the internal precision components, making it adaptable to complex working conditions.

What is the VE Series Slewing Drive

Its load – drive capacity is outstanding. Different models offer a wide range of output torques and can withstand high torques and heavy loads, performing remarkably in large – scale equipment. In terms of transmission accuracy, by leveraging the enveloping toroidal worm gearing technology and precision manufacturing processes, it can achieve accurate positioning and stable operation, effectively reducing transmission errors. This makes it suitable for scenarios with strict precision requirements.

Easy installation is also a major highlight. It provides single – flange or double – flange output forms. During installation, only simple bolt connections and rotation operations are required, reducing installation difficulty and time costs. Moreover, it has excellent protection performance. With a high protection rating, it can resist the erosion of dust and water vapor, ensuring stable operation even in harsh environments and extending the service life of the equipment. It has extensive and excellent application performances in many fields such as solar tracking systems, cranes, and aerial work platforms.

Advantages of the VE Series Slewing Drive

The VE series slewing drive fully demonstrates its superiority in the industrial field.

In terms of structural design, it adopts a vertical structure with a compact and reasonable layout. Compared with traditional slewing drives, it can greatly reduce the overall system cost, showing prominent advantages in vertical design and standing out in the market competition.

Its accuracy performance is excellent, with extremely high tracking and positioning accuracy. It can complete various slewing movements accurately, enabling it to perform stably in scenarios with strict precision requirements. For example, in the tracking system of new energy photovoltaics, it can precisely follow the sun’s trajectory.

The drive methods are extremely diverse, covering a variety of drive devices such as hydraulic motors, DC motors, and AC motors. Facing different working conditions and power requirements, users can always find a suitable solution. Whether in a conventional environment with sufficient power supply or a complex scenario with special requirements for power sources, the VE series slewing drive can flexibly respond and easily adapt, laying a solid foundation for the stable operation of the equipment.

Applications of the VE Series Slewing Drive

Due to its reasonable structure, high precision, and diverse drive methods, the VE series slewing drive has a wide range of applications in many fields. In the new energy photovoltaic field, it enables photovoltaic panels to accurately track the sun with its high – precision positioning and tracking capabilities, greatly improving power generation efficiency. In the construction machinery field, for equipment such as cranes and excavators, it can withstand huge axial and radial loads, facilitating the flexible slewing of the working device and adapting to various complex operations. In port machinery, gantry cranes and rubber – tired gantry cranes rely on it to achieve smooth rotation of the boom, efficiently completing cargo handling operations and stably coping with harsh port environments. In the wind power generation field, it helps the nacelle of wind turbines to precisely turn according to the wind direction, keeping the wind turbine blades in the optimal wind – facing state at all times and improving wind energy utilization efficiency.

Price of the VE Series Slewing Drive

The price of the VE series slewing drive is affected by multiple factors. Raw materials are the foundation. Using high – quality steel with excellent strength, toughness, and wear resistance can enhance the product’s performance and durability, but it also significantly increases costs. If ordinary steel is used, the price will be lower. Manufacturing processes are also crucial. Using advanced precision processing equipment and strict quality control procedures can ensure high – precision and low – roughness of the slewing drive, improving product performance and reliability, and correspondingly, the price will be higher. Products manufactured by simple processes have a lower price. In terms of size specifications, large – sized or special – specification slewing drives are more expensive than conventional products due to their high production difficulty and large material consumption. In addition, market supply and demand relationships also influence prices. When demand is strong and supply is tight, prices rise; when supply exceeds demand, prices fall.

Supplier of the VE Series Slewing Drive

LDB Bearing always adheres to the concept of quality first. Every drive is meticulously crafted through strict processes. With its excellent wear resistance and stability, it has become the sturdy core of numerous mechanical devices, injecting surging power into industrial operations.

Applications of Slew Bearings in the Industrial Field

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Slewing bearings play a significant role in the industrial field. They enable the flexible rotation of equipment components, withstand axial and radial loads as well as overturning moments, enhance stability and work efficiency, and are applied to various types of machinery.

What is slew drive?

Slew drive is a kind of slewing drive device, which has the characteristics of high load capacity, high precision, compact design, good sealing performance, high integration degree, convenient installation and maintenance, large transmission ratio, and high safety. It can play an important role in a variety of different industrial fields and equipment, achieving precise rotary motion and reliable load support.

Electric Motors and Generators

Application: Bearings are used in electric motors and generators to support the rotor, reduce friction, and ensure smooth rotation.

Types: Deep groove ball bearings, cylindrical roller bearings, angular contact ball bearings, etc.

Features: High speed, low noise, long service life.

Pumps and Compressors

Application: Bearings are used to support the rotating components of pumps and compressors, and they bear radial and axial loads.

Types: Deep groove ball bearings, tapered roller bearings, thrust ball bearings, etc.

Features: High temperature resistance, corrosion resistance, high load capacity.

Fans and Blowers

Application: Bearings are used to support the fan shaft, ensuring smooth rotation and efficient operation.

Types: Deep groove ball bearings, self-aligning ball bearings, cylindrical roller bearings, etc.

Features: Low friction, low noise, long service life.

Machine Tools and Machining Centers

Application: Bearings are used to support spindles, lead screws, and guide rails, ensuring high-precision machining.

Types: Angular contact ball bearings, cylindrical roller bearings, thrust ball bearings, etc.

Features: High precision, high rigidity, high speed.

Conveyors and Belt Systems

Application: Bearings are used to support the rollers and drive shafts of conveyors, ensuring smooth operation.

Types: Deep groove ball bearings, self-aligning ball bearings, tapered roller bearings, etc.

Features: High load capacity, impact resistance, long service life.

Heavy Machinery

Application: Bearings are used to support rotating components in heavy machinery such as excavators, cranes, and bulldozers.

Types: Tapered roller bearings, spherical roller bearings, cylindrical roller bearings, etc.

Features: High load capacity, impact resistance, wear resistance.

Mining Machinery

Application: Bearings are used to support rotating components in mining machinery such as crushers, ball mills, and screening machines.

Types: Spherical roller bearings, cylindrical roller bearings, tapered roller bearings, etc.

Features: High load capacity, impact resistance, wear resistance.

Paper Machinery

Application: Bearings are used to support rotating components in paper machinery such as rollers, calenders, and winders.

Types: Cylindrical roller bearings, spherical roller bearings, angular contact ball bearings, etc.

Features: High temperature resistance, corrosion resistance, high precision.

Food and Beverage Machinery

Application: Bearings are used to support rotating components in food and beverage machinery such as mixers, fillers, and packaging machines.

Types: Stainless steel bearings, food-grade grease bearings, etc.

Features: Corrosion resistance, compliance with food safety standards.

Textile Machinery

Application: Bearings are used to support rotating components in textile machinery such as spinning machines, weaving machines, and winding machines.

Types: Deep groove ball bearings, cylindrical roller bearings, angular contact ball bearings, etc.

Features: High speed, low noise, long service life.

Steel and Metallurgical Equipment

Application: Bearings are used to support rotating components in steel and metallurgical equipment such as rolling mills, continuous casters, and blast furnaces.

Types: Tapered roller bearings, spherical roller bearings, cylindrical roller bearings, etc.

Features: High temperature resistance, high load capacity, wear resistance.

Chemical Equipment

Application: Bearings are used to support rotating components in chemical equipment such as agitators, centrifuges, and pumps.

Types: Stainless steel bearings, corrosion-resistant bearings, etc.

Features: Corrosion resistance, high temperature resistance, long service life.

Energy Equipment

Application: Bearings are used to support rotating components in energy equipment such as wind turbines, hydro turbines, and gas turbines.

Types: Tapered roller bearings, spherical roller bearings, cylindrical roller bearings, etc.

Features: High load capacity, high temperature resistance, long service life.

Automation Equipment

Application: Bearings are used to support rotating components in automation equipment such as robots, conveyors, and assembly lines.

Types: Deep groove ball bearings, angular contact ball bearings, linear bearings, etc.

Features: High precision, low noise, long service life.

Bearings have a wide range of applications in the industrial field, covering almost all mechanical equipment that requires rotational or linear motion. Different types of bearings have different characteristics and are suitable for various working conditions and application scenarios. Proper selection and use of bearings can significantly improve equipment efficiency, extend service life, and reduce maintenance costs.

Supplier of slewing Bearing

Slew drive of LDB Bearing have an extremely high load capacity and can easily handle all kinds of heavy-duty operations. Even in harsh working conditions, it is no problem at all. Thanks to its compact design, you don’t have to worry about limited space during installation and can flexibly arrange it in narrow areas. Moreover, it has extremely high precision, ensuring stable operation of the equipment and accurate positioning, which greatly improves the quality of the work. With a high degree of integration, its installation and maintenance are simple and convenient, saving you a lot of time and cost. Its advantage of a large transmission ratio enables efficient power transmission, helping you easily achieve the desired rotational speed. Additionally, it has excellent sealing performance and safety features, allowing you to be fearless in harsh environments and ensuring worry-free and safe operation.

How to Distinguish Ball Bearings and Roller Bearings

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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.

Feature of Ball Bearings

Primarily composed of balls, inner rings, outer rings, and retainers. Generally, for industrial ball bearings, the balls and rings are made of high-chromium steel, while the retainers are less hard compared to the balls and rings, and can be made of metal or non-metal materials.

Advantages of ball bearing.

Low friction resistance: Compared to other types of bearings, ball bearings have lower rotational friction resistance, resulting in lower temperatures generated by friction at the same speed.Ability to withstand combined loads: Can handle both radial and axial loads simultaneously, though the load capacity is relatively lower compared to roller bearings.Less sensitive to lubrication interruption: Short-term lubrication interruptions have relatively less impact on their performance.No self-excited instability: Operates more stably, less prone to self-excited instability.Easy to start at low temperatures: Easier to start in low-temperature environments, quickly reaching normal operating conditions.

Classification of Ball Bearings

Deep groove ball bearings: Simple structure, easy to use, mass-produced, widely used, mainly for radial loads, can also handle some axial loads.

Angular contact ball bearings: The contact points between the balls and the inner and outer rings are angular, capable of withstanding higher axial and radial loads, with high rigidity and precision, suitable for high-speed machinery.

Self-aligning ball bearings: Have two rows of steel balls, inner rings with two raceways, outer ring raceways are spherical, with self-aligning properties, can automatically compensate for coaxiality errors caused by shaft deflection and housing deformation.

Thrust ball bearings: A separable bearing, the shaft washer, housing washer can be separated from the cage and ball assembly, can only withstand axial loads, single-direction thrust ball bearings can only withstand axial loads in one direction, double-direction thrust ball bearings can withstand axial loads in both directions.

The feature of roller bearing.

Roller Bearing are a type of rolling bearing that uses rollers as rolling elements, relying on rolling contact between main components to support rotating parts, widely used in modern machinery. The following is a detailed introduction:

Structural Composition

Radial roller bearings: Composed of inner rings, outer rings, rollers, and retainers. Rollers are arranged between the outer diameter surface of the inner ring and the inner diameter surface of the outer ring, the retainer evenly distributes the rollers, preventing mutual contact friction.

Thrust roller bearings: Rollers and retainers are sandwiched between two washers, the structure can be integral or split, determined by assembly convenience.

Rolling Element Shapes

Cylindrical roller bearings: Rollers are cylindrical, radial type only withstands radial loads, thrust type only withstands thrust loads.

Needle roller bearings: Rollers are slender like needles, with the smallest outer diameter for the same inner diameter, suitable for places with small radial space.

Tapered roller bearings: Rolling elements are conical, can withstand loads perpendicular to the shaft and axial loads in a fixed direction.

Spherical roller bearings: Rolling elements are barrel-shaped, can withstand loads perpendicular to the axis and axial loads in both directions, with good self-aligning properties.

Advantages of Roller bearing

High load capacity: Rolling elements and raceways are in line contact, high load capacity, small deformation after loading.

High rotational accuracy: Ensures precise positioning of rotating components, making equipment operation smoother.

Low starting torque: Requires less torque to start, saving energy, improving equipment efficiency.

Ball bearings and roller bearings can be distinguished in the following aspects:

Observing Rolling Element Shapes

Ball bearings: Rolling elements are spherical, usually steel balls, but can also be ceramic balls.

Roller bearings: Rolling elements are cylindrical, conical, or barrel-shaped rollers.

Comparing Load Capacity

Ball bearings: Rolling elements and raceways are in point contact, small contact area, relatively lower radial and axial load capacity, but more balanced performance under combined loads.

Roller bearings: Rolling elements and raceways are in line or surface contact, large contact area, can disperse loads, significantly higher radial load capacity than ball bearings, axial load capacity depends on roller type.

Comparing Speed Performance

Ball bearings: Rolling element shape suitable for high-speed operation, low friction resistance, low heat generation, high limiting speed.

Roller bearings: Large contact area, high friction resistance, prone to heat generation, suitable for medium and low-speed equipment, relatively lower limiting speed.

Feeling Vibration and Noise Levels

Ball bearings: Spherical rolling element design, smoother operation, generally lower vibration and noise levels.

Roller bearings: Due to rolling element shape and contact method, may produce more vibration and noise in certain applications.

Considering Installation and Maintenance Difficulty

Ball bearings: Simple structure, generally easier to install and maintain.

Roller bearings: Complex manufacturing process, higher installation precision requirements, relatively higher maintenance cost and time.

Viewing Application Scenarios

Ball bearings: Suitable for high-speed, precision equipment, such as motors, machine tools, bicycles, etc.

Roller bearings: Used for high-load, long-life applications, such as heavy machinery, automobiles, railway vehicles, etc.

Price of Roller Bearings and Ball Bearings

Different types of roller bearings or ball bearings have different prices due to structural and manufacturing process differences. For example, thrust roller bearings are relatively complex in structure, generally more expensive than ordinary cylindrical roller bearings; high-precision angular contact ball bearings are difficult to manufacture, more expensive than ordinary deep groove ball bearings. Common materials include chromium steel, stainless steel, bearing steel, etc. If special materials such as ceramics are used, the cost will significantly increase, and the price will also be higher. Bearings made of special materials have high temperature resistance, corrosion resistance, etc., suitable for special working conditions.Of course, LDB-Bearing company will provide you with the best production assembly and the most favorable prices. If you want to know more, you can contact us.

Slewing drive project by LDB Bearings was officially launched

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Slewing drive project by LDB Bearings was officially launched

On the afternoon of July 8, 2022, slewing drive project jointly developed by LDB Bearings and a famous European company was officially launched, and the company held a mobilization meeting. At the meeting, the chairman of LDB Bearings requested that the team leaders and backbones of the production workshop must unify their thinking, overcome difficulties, and strictly follow the process and technical requirements to complete the research and development tasks of the rotary drive samples accurately.

 

 

At the meeting, Tong Yongzhong, chairman of LDB Bearings, said: “this is the second cooperation between the company and customers. 10 sets of slewing drive samples developed and produced for customers last year have all been accepted after trial by customers, and customers are very satisfied. And then, seven sample orders of slewing drive models were placed in three batches this year.

 

 

 

Finally, Director Zhang of the production department of the company said: “All the staff of the production department will complete this slewing drive production task with the fullest enthusiasm, the most vigorous fighting spirit, the most hard-working spirit, the most tenacious perseverance, and the most perfect products.

 

 

 

 

The corporate philosophy of “Elaborate Manufacturing, Serve the World” is not only a slogan, but also needs to be implemented in practical work, and also needs all LDB people to challenge themselves constantly. Only in this way, LDB Bearing‘s corporate vision of “committed to becoming a world-renowned slewing drive manufacturer” can be realized. For this reason, LDB people will continue to pursue it unremittingly!

Slewing Bearing Processing Manufacturer

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Slewing bearing rolling element

The rolling elements of the slewing ring are made of anti-friction bearing steel. Such materials will be produced according to the company’s standard regulations, and through strict chemical composition analysis of the materials, relevant reports will be printed out. In order to ensure the same quality, the production standard batches will be strictly monitored during the licensing process. LDB slewing bearing rolling body is regularly audited and inspected to ensure the high quality pass rate of the product.

Slewing Ring Washer/Cage

The gaskets and cages of the slewing bearing are mostly made of polyamide. Such a cage can maintain the equidistant rotation of each rolling element during the rotation of the rolling elements, preventing the rolling elements from running safely and reliably. Polyamide gasket cages produced by LDB slewing bearings are of consistently high quality. In certain bearings, metal spacers and cages are also used.

Slewing ring raceway

For the slewing bearing raceway of rolling elements, LDB relies on precise machining and unique engineering principles to keep the rolling elements stable in motion.

Manufacturing process of LDB slewing bearing raceway – car pin

The runway after turning is quenched on a re-quenching machine to increase the hardness of the runway, and the slewing bearing runway after quenching is polished to a certain smoothness.

Slewing Ring Seals

When designing the raceway system of LDB’s large slewing bearing, lip seal kits are designed on both the upper and lower sides. These seals have two main functions: 1. Prevent dust, moisture and other particles from entering the bearing and cause wear and damage; 2. The seals separate the raceway and the bearing ring.

Slewing ring seals are available in a variety of materials and types. The type and material of the seal depends on the shape of the bearing and the surrounding service environment. The slewing bearing of mechanical engineering adopts a simple lip design, which has a better sealing effect. In special circumstances, however, different groove designs are used. The slewing bearing working in a particle-rich environment, with a simple design, is ineffective, and it is easy for grease to flow out of the seal, affecting the slewing bearing operation, and there will be a certain degree of wear. For example, working in ultraviolet and high oxygen content environments will be affected. Therefore, the seals of LDB slewing bearings will be made of different materials according to customer needs, and it is recommended to use specially designed seals, and during the installation process, the seals should be filled with grease.

Slewing Bearing Gear Drive

LDB slewing bearings can have two types of internal gears and external gears, both of which are spur gear operation modes. As well as special gear structures, helical gears and turbine gears, toothless slewing bearings can also be produced according to customer requirements.

Gear hardening

For the most part, the teeth are in their natural state, as are the rings themselves. The strength characteristics of the gear teeth are the strength characteristics of the base metal. If the application requires additional strength and wear resistance, the gear teeth are induction hardened. Hardening of the teeth will increase the wear and strength properties to the desired level. Depending on the pitch diameter and module of the gear, the teeth are induction hardened or rotationally hardened. To avoid metallurgical gaps with unhardened material in the transition zone, the teeth are hardened primarily at the root of each tooth. In addition to improving the load-carrying capacity of the tooth surface, it also increases the strength at the tooth root. Tooth spacing hardened hardened microsections.

Bearing Ring

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A bearing ring is an annular part of a radial rolling bearing with one or several raceways.

Bearing rings are divided into: bearing inner ring, bearing ring with raceway on the outer surface; bearing outer ring, bearing ring on the inner surface of the raceway; tapered inner ring, inner ring of tapered roller bearings; tapered outer ring, tapered outer ring outer ring of roller bearings; double raceway tapered inner ring, double raceway tapered roller bearing inner ring; double raceway tapered outer ring, double raceway tapered roller bearing outer ring; wide inner ring, in A bearing inner ring widened at one or both ends to improve the guidance of the shaft in its bore or to provide additional locations for mounting fasteners or seals; a keyed inner ring, a grooved ball bearing inner ring with all or part of the shoulder removed ; Locked outer ring, a grooved ball bearing outer ring with all or part of the shoulder removed; Stamped outer ring, stamped from a thin sheet metal, sealed at one end (sealed stamped outer ring) or open at both ends, generally directed toward the center roll Outer ring of needle bearings; flanged outer ring, bearing outer ring with flanges; self-aligning outer ring, outer ring with spherical outer surface to accommodate permanent angular displacement between its axis line and the bearing seat axis line ; Self-aligning outer race, used for aligning the ring between the outer ring and the seat hole, has a spherical inner surface that matches the spherical outer surface of the outer ring; outer spherical surface, the outer surface of the bearing outer ring is a part of the spherical surface; The front rib of the conical outer ring, the rib on the front of the raceway of the conical outer ring, is used to guide the roller and bear the thrust of the large end face of the roller; the middle retaining ring, the bearing ring with double raceway, such as the double raceway cone The middle integral rib of the inner ring.

Production steps of bearing rings

  1. Bearing ring forging: If over-burning, overheating, and internal cracking into reticulated carbides occur during the forging process, the toughness and strength of the ring will be reduced. Therefore, it is necessary to strictly control the processing temperature, cyclic heating and post-forging heat dissipation conditions (such as spray cooling), etc., especially after the final forging of larger varieties of ferrules, the temperature is above 700 ℃, and they should not be stacked and placed.
  2. Heat treatment of bearing rings: Close monitoring of heat treatment equipment is an important work in the workshop. Monitoring equipment reliability. Important temperature control equipment such as instruments and thermocouples must be closely monitored to ensure accurate and reliable measurement data; those with errors exceeding the standard should be replaced in time, and it is strictly forbidden to operate with illness.
  3. Monitoring of bearing ring grinding process. The finished imported bearing rings are not allowed to have grinding burns and grinding cracks, especially the matching surface of the inner ring screwdriver must not have burns. If the ferrules are pickled, they should be fully inspected, and the burnt products should be removed. Those with severe burns that cannot be repaired or those that fail to be repaired should be scrapped. The ferrules with grinding burns are not allowed to enter the assembly process.
  4. Bearing ring identification management, after the steel is put into storage and before the ring grinding, each process must be strictly managed, and strictly distinguish between GCR15 and GCR15SIMN two different materials and products.

Depending on the application and purpose of the LDB large diameter bearing, different materials are used for the bearing rings. These standards are made of tempered alloy steel and are specified by our own company standard (LN), derived from DIN EN 10083-1. For applications requiring additional properties, special materials such as chrome-nickel steel for low temperature environments are used.

The chemical composition, the handling of the material during the formation of the raw material and the mechanical properties of the base material are specified in the company standards. To ensure consistent quality, each raw material is monitored during manufacturing according to the testing criteria defined in the LDB standard.

Regular audits of suppliers ensure compliance with delivery specifications.

Various certificates are available for raw materials according to DIN EN 10204, as required by the scope of testing and documentation.

On request, provide all documentation required for component or system certification or classification.

Wind Power Bearing Manufacturer

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Wind power bearing manufacturer | LDB

In addition to innovative solutions for pitch and yaw bearings, the main focus is on the development of main bearings. LDB wind turbine bearings play a crucial role in its role as a global market leader in slewing bearings. Intensive research and development has led to the successful deployment of LDB wind turbine bearing products in wind power plants (onshore and offshore) around the world.

The Wind drive

Limited resources and rising energy prices pose global challenges. At LDB wind turbine bearings, we are addressing this challenge by developing groundbreaking solutions.

In order to make progress in providing environmentally friendly energy, we are installing increasingly efficient wind power plants around the world, which are now able to compete with fossil energy resources. LDB wind turbine bearings are a strong and progressive partner in the field of onshore and offshore systems. We constantly seek innovation and breakthroughs, so that our customers can not only become part of the new energy era, but also promote the development of the new energy era, and make important contributions to ensuring a more environmentally friendly future.

Carbon dioxide free (CO2) energy obtained through wind power generation is becoming more and more important.Since the establishment of the industry, the company’s commitment to renewable energy has made it a reliable partner for all major wind power plant manufacturers.

Slewing Bearing Installation Surface

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Mechanical machining of the bearing connection surfaces on the connecting structure is required . The mounting position of slewing bearings must correspond to that shown in the drawing. If a transporting cross was delivered, it has to be removed before installation.

The corrosion protection can be removed with an alkaline cleaner. Cleaner must be prevented from coming into contact with the seals or the raceway. Remove the protective coating from the upper and the lower mounting surfaces of the slewing bearing as well as from the gear.

The corrosion protection can easily be removed, for example, using a biodegradable alkaline cleaner.

Rapid removal of the corrosion protection and low environmental impact.

The unhardened zone between the beginning and the end of the hardened region of the raceway is marked with an “S” on the inner or outer diameter of each bearing ring. On the gear ring, the hardness gap is marked on the axial surface. Wherever possible, the hardness gap “S” must be positioned outside the main load-carrying areas. If the main working area for the application is known, then the hardness gap of the ring loaded on the circum-ference must also be positioned outside the main load-carrying area.

The bearing must be completely screwed on for commissionings and test runs. Sufficient load / moment loan must be applied to avoid a slip-stick effect on the anti-friction bearing bodies.

Gearing

Entanglement hazard due to exposed gear

  • Keep hands away from moving parts

The backlash is adjusted relative to the three gear teeth marked in green and should be 0.03 – 0.04 x module.After the final tightening of the bearing,the backlash should be rechecked over the entire circumference. A tip edge radius and a tip relief must be provided on the pinion.

Slewing Bearing Installation&Storage

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Slewing Bearing Installation

LDB Slewing Bearing offers an extensive slewing bearing service

Slewing Bearing InstallationTransport and handling

Danger of life by overhead load

  • Do NOT step underneath the load
  • Use suitable slings
  • Use suitable lifting devices
  • Suitable transport tap hole are stated in the bearing drawing

Slewing bearings, like any other part of a machine, require careful handling. They should always be ransported and stored in horizontal position. For safe handling of bearings which include transport holes, high tensile lifting eye bolts must be used. In special cases an internal cross bracing (transporting cross) is required. The bearing weight must be indicated on the crate or pallet. Impact loads, particularly in a radial direction, must be avoided.

Slewing bearings Delivery condition

  • Raceway system

The slewing bearings are delivered filled with one of the greases unless no special lubricant and special grease quantities are required.

  • External contours

The external contours of the bearings (except for holes) have Cortec VCI corrosion protection applied.

  • Gearing

The gearing is not greased. The corrosion protection is applied as for the external contours.

Slewing Bearings Storage

Sensitive surface

  • Do not open the packing with a sharp blade
  • Surface may be damaged

Approx. 6 months in roofed storage areas. Approx. 12 months in enclosed, temperature-controlled areas (temperature > 12 °C ). Outside storage is not allowed.

If required, other corrosion protection agents and types of packaging can be used, e.g. long-term packaging for up to 5 years.

Longer storage periods will necessitate special preservation. After the slewing bearing has been stored for a relatively long time, an increased frictional torque may be observed caused by the suction adhesion of the sealing lip. Careful lifting of the sealing lip with a blunt object around the entire circumference and several clockwise and counterclockwise rotations of the slewing bearing through 360 degrees will reduce the frictional torque to normal.

Slewing bearings Installation

Risk of skin irritation caused by preservative

  • Safety gloves must be worn for removal
  • Pay attention to the producer’s data

Entrapment hazard when putting the load down

  • Location control before putting tazhe load down
  • Mind the staff

A flat mounting surface free of grease and oil is essential for the upper and lower ring to seat firmly. Welding beads, burrs, excessive paint and other irregularities must be removed prior to installation. The bearing rings must be completely supported by the connecting structure.

LDB Slewing bearings  recommends conducting a check on the mounting surfaces with a leveling instrument or laser equipment (this service can be provided by LDB). The flatness values should not exceed the values shown in table 1. To avoid larger deviations and the occurrence of peaks in smaller sectors, any deviation in the range of 0°–180° may only rise evenly once and fall again.