Extra-Large Diameter- LTZC 5000mm high temperature slewing bearing

In industries such as metallurgy, mining, building materials, cement, and high-temperature industrial furnaces, equipment is frequently required to operate stably under conditions involving sustained high temperatures, heavy shock loads, and complex working environments. Conventional industrial bearings are prone to issues such as lubrication failure, reduced material strength, and thermal deformation when exposed to high-temperature environments; consequently, for large-scale rotary machinery, high-temperature slewing bearings have emerged as critical components for ensuring reliable equipment operation.

As an enterprise specializing in the manufacturing of large-scale slewing bearings and precision bearings, LTZC has long been dedicated to the research, development, and production of large-scale specialized bearings. Recently, LTZC successfully developed and delivered an ultra-large high-temperature slewing bearing with a diameter of 5,000 mm; this product is destined for application in large-scale rotary furnace equipment overseas.

What are High-Temperature Bearings?

High-temperature bearings are a type of bearing designed for long-term operation in high-temperature environments. High-temperature bearings place significant demands on lubrication and materials. Typically, when the operating environment temperature exceeds 150°C, the performance of grease and materials in ordinary industrial bearings deteriorates significantly. Therefore, specially designed high-temperature bearing structures are required.

The following technical factors need to be considered when designing high-temperature bearings:

1. Material Heat Resistance: 

High-temperature environments can lead to reduced material strength, increased thermal expansion, and even cracking. Therefore, high-temperature bearings typically use high-temperature resistant alloy steel or heat-treated bearing steel. These materials maintain good mechanical properties and dimensional stability at high temperatures, extending the bearing's service life.

2. High-Temperature Lubrication System:

Ordinary greases easily decompose or evaporate at high temperatures, reducing their effectiveness. Therefore, high-temperature bearings typically use high-temperature synthetic greases. These greases are specifically designed for high-temperature environments, are less prone to decomposition and evaporation, and maintain stable operation of the bearing, preventing issues such as jamming and downtime.

3. Thermal Expansion Compensation Design:

In high-temperature environments, the internal components of the bearing experience significant thermal expansion. Without a proper structural design, issues such as raceway jamming, increased running resistance, and premature bearing failure can easily occur. Therefore, high-temperature bearings require optimized clearance design, raceway structure optimization, and thermal stress analysis to ensure stable operation.

4. Sealing Structure Optimization：

High-temperature environments are often accompanied by dust, oxides, or corrosive gases; therefore, the sealing system must possess the following characteristics: high temperature resistance, dustproof, and oxidation resistance.Metal seal structures or high-temperature resistant rubber seals are typically used.

Which bearings are suitable for high-temperature environments?

In industrial equipment, different types of bearings are suitable for different high-temperature applications. Common high-temperature bearings include the following categories:

1. High-Temperature Slewing Bearings

High-temperature slewing bearings are made of specially heat-treated bearing steel. They are special bearings capable of withstanding axial forces, radial forces, and overturning moments. These bearings can operate stably in high-temperature environments and are widely used in large rotating equipment.

Their characteristics include: Large diameter range; High structural rigidity; Capable of withstanding heavy loads and impact loads; Suitable for low-speed rotating equipment. In high-temperature industrial furnaces, rotary kilns, and mining equipment, high-temperature slewing bearings are core rotating components.

2. High-Temperature Roller Bearings

Roller bearings have strong load-bearing capacity in high-temperature environments and are suitable for: metallurgical equipment, continuous casting equipment, and high-temperature conveying equipment. Their main advantages are high load-bearing capacity and good impact resistance.

3. High-Temperature Resistant Sliding Bearings

Sliding bearings are typically made of copper alloys or composite materials, and in high-temperature environments, they possess:

Good wear resistance

Stable lubrication performance

Strong resistance to contamination

Commonly used in large, heavy-duty equipment.

4. Ceramic Bearings

Ceramic bearings have the following advantages:

Good high-temperature resistance

Low coefficient of friction

Not easily oxidized

However, due to their higher cost, they are typically used in high-end precision equipment or special industrial environments.

Application Case: 5000mm-Diameter High-Temperature Furnace Rotation Equipment

In a large-scale high-temperature furnace project for an overseas metallurgical enterprise, the client required a massive slewing bearing assembly to support the furnace body's rotation mechanism. To ensure the bearing's stable operation within a high-temperature and high-dust environment, the LTZC team implemented specialized designs for both lubrication and sealing systems.

The key specifications of this equipment are as follows:

Operating Temperature: > 250°C

Equipment Diameter: Approx. 5000 mm

Rotational Speed: Low-speed operation

Load Capacity: Several hundred tons

Operation Mode: Long-term continuous operation

LTZC High-Temperature Slewing Bearing Solution

As a professional bearing manufacturer, LTZC has provided a comprehensive technical solution for high-temperature slewing bearings tailored specifically to this project.

1. Structural Design for Ultra-Large Slewing Bearings

LTZC designed a high-temperature slewing bearing with an outer diameter of 5,000 mm for the client. The structure features a double-row ball slewing bearing. Furthermore, the raceway design was optimized to meet the client's specific requirements; this structural design not only enables the bearing to withstand the heavy loads imposed by large-scale equipment but also ensures stable rotational performance.

2. High-Temperature Material Technology

To adapt to high-temperature environments, LTZC utilized a specialized alloy steel material. Through the optimization of heat treatment processes, the bearing was endowed with exceptional heat resistance and enhanced fatigue strength. This material retains its superior mechanical properties even when operating in high-temperature conditions.

3. High-Temperature Lubrication System

High-temperature environments necessitate a specialized design for the slewing bearing's lubrication system. For this specific bearing unit, LTZC employed a high-temperature synthetic grease, optimized the lubrication channels, and increased the number of lubrication points. This ensures that the bearing maintains a stable state of lubrication even when operating in high-temperature environments.

4. Optimized Sealing Structure

To prevent high-temperature dust and particulate matter from entering the bearing's interior, LTZC incorporated high-temperature-resistant rubber seals. This design effectively extends the operational service life of the bearing.LTZC  provide customized sealing ring service.

Contact LTZC customized slewing ring

As industrial equipment evolves toward larger scales, higher operating temperatures, and heavier loads, traditional bearings are increasingly struggling to meet the demands of complex operating conditions. High-temperature slewing bearings are therefore playing an increasingly vital role in sectors such as metallurgy, mining, and industrial furnaces.

The successful delivery by LTZC of a 5,000mm large-diameter slewing bearing not only demonstrates the company's manufacturing prowess in the realm of large-scale bearings but also serves as a testament to its continuous innovation capabilities in high-temperature bearing technology.

Moving forward, LTZC will remain focused on the R&D and manufacturing of slewing rings and large-scale specialized bearings, providing global clients with even more reliable solutions for slewing bearing applications and contributing to the advancement of the high-end equipment manufacturing industry.