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kiln support roller

large steel castings provider

WEIGHT ≤50T

MATERIAL & SIZE: ZG55、ZG42CrMo, etc

CUSTOMIZATION: by drawings

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AGICO CEMENT supplies kiln support rollers and kiln support roller bearing with high quality and customization service. What is a kiln support roller? The kiln support roller and bearing is mainly used to keep the low-speed and stable running of the kiln shell and kiln girth gear on kiln support roller. The main purpose of the kiln support roller and bearing structure is to enable the kiln tyre and kiln shell to rotate smoothly at low speeds.

Generally, the kiln support roller devices in a rotary kiln can be divided into sliding bearing support roller groups, rolling bearing support roller groups, and sliding-rolling bearing support roller groups, depending on the type of bearings used. Furthermore, the rolling bearing support roller group in the rotary kiln can be classified into a shaft type and a heart type. Practical experience has shown that the rolling bearing support roller group offers advantages such as simple structure, smooth operation, easy maintenance, and low friction resistance, which effectively reduces power consumption. However, due to the high load capacity of the kiln support roller in a rotary kiln, which can reach several hundred tons, the size of the rolling bearings needs to be large, and there are certain limitations imposed by the supply conditions.

In our kiln support roller structure, the axial force is transmitted to the thrust ring and thrust shoe through a large bolt at the end of the shaft and 6-8 peripheral bolts. The sliding bearings transfer the axial force through grooves and retaining rings at the end of the shaft, which is more reliable. The lubrication of the sliding bearings in the rotary kiln is provided by oil scooping, and cooling water is circulated inside the spherical bushing for cooling. Additionally, due to the inclined installation of the supporting wheel group in the rotary kiln, necessary measures need to be taken to address oil leakage from the shaft neck. This is done by creating a return oil hole on the side of the shaft shoe that faces the supporting wheel, and using a triangular prism scraper on the upper part of the shaft to prevent oil flow towards the sealing ring.

how kiln support rollers are made?

This is a standard processing steps for steel casting (only for reference): model making → modeling → pouring → sand cleaning → annealing → inspection → processing bonding surface → drilling and reaming of bonding surface → processing outer circle and end face → rough gear hobbing → fine gear hobbing → drilling → oiling → storage.

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kiln support roller material

In general, the kiln support rollers in a rotary kiln are made of materials such as ZG55, 35SiMN, 40CrMO, or forged steel materials of the same composition. The choice of material may vary depending on the size of the kiln. The processing requirements are relatively uniform, and the cast steel components need to undergo quenching and tempering treatment to refine the metal structure and achieve a uniform microstructure. The hardness (HB) of the supporting wheel should reach 190-210 HB to meet the standards of heavy load-bearing and wear resistance.

Typically, the outer surface hardness of the supporting wheel should be at least 20 HB higher than the hardness of the tire. The material selection for the supporting wheel in a rotary kiln is crucial during its operation. Generally, the appropriate material is chosen based on the actual operating conditions of the rotary kiln, and there are reference standards available during the selection process.

For kiln diameters up to four meters, the chosen material should meet standards higher than JC/T401.2 and the corresponding criteria for ZG340-640. The castings used in production need to undergo quenching and tempering treatment, and the surface hardness of the outer circle should be higher than 190 HB after processing.

By meeting the above-mentioned reference standards, the application of the supporting wheel in the calcination process of a rotary kiln will be more efficient and provide a basis for high-efficiency production. For kiln diameters above four meters, the material should meet standards higher than JB/T6402 and the corresponding criteria for ZG42CrM0. The difference in thickness between the rim and hub of the processed rotary kiln wheel should generally be maintained at around 5% of the standard size.

The coaxiality tolerance of the outer surface facing the shaft hole inside the rotary kiln should comply with GB/T1184-1996, which is higher than Class 8 accuracy, and the tolerance for the outer cylindrical surface and cylindricity should be 0.2 millimeters. Similarly, the castings also need to undergo quenching and tempering treatment, and the surface hardness of the processed outer circle should be higher than 200 HB.

Leading rotary kiln supplier – AGICO CEMENT

As a leading rotary kiln supplier from China, we have the ability to design, manufacture and install rotary kilns applied to the cement plant, lime production, activated carbon plant, minerals, chemicals, and etc. we also offer related rotary kiln parts to support stable operation of rotary kilns.