Tongli rotary kiln bearing housing Introduction

The bearing housing of a rotary kiln, also known as the bearing pedestal or bearing support, is a critical component that holds and supports the bearing in the rotary kiln support roller’s rotating motion. The bearings in the housing allow the rotary kiln's support roller shaft to rotate smoothly while bearing the loads generated during grinding operations. Tongli, as a professional cement plant parts manufacturer, provides various types of rotary kiln bearing housing with different specifications and materials for example cast iron and cast steel. Tongli rotary kiln bearing housing steel casting has a mature casting process and strong machining strength. Tongli steel casting is made of high-quality mild carbon steel and 304 stainless steel that is fresh out from our own fabrication workshop in which the quality of the raw material is strictly controlled. Welcome to check out our manufacturing series video on our Youtube channel, we have a whole episode of how the parts are manufactured.

Tongli rotary kiln structure

A rotary kiln is a large cylindrical vessel used for a variety of processes, such as drying, calcination, and chemical reactions. It's commonly used in industries like cement production, lime manufacturing, and more.

Shell: The main cylindrical body of the rotary kiln is called the shell. It is typically made of steel and lined with refractory materials to withstand high temperatures and chemical reactions. The shell is inclined slightly from the horizontal and rotates on its axis.

Riding Rings and Rollers: The shell is supported by a set of riding rings and rollers. The riding rings are large rings that encircle the shell at various intervals along its length. The rollers, placed between the riding rings, support the weight of the kiln and allow it to rotate smoothly.

Tyres (Tires): Tyres are large, circular steel components that are attached to the shell. They usually have a conical shape to provide support and help distribute the load evenly. Tyres are sometimes fitted with riding pads to further reduce friction and wear.

Girth Gear: The girth gear is a large ring gear that is attached to the shell and meshes with a pinion gear. This arrangement drives the rotation of the kiln. The girth gear is often supported by trunnion rollers to maintain proper alignment.

Pinion Gear: The pinion gear is a smaller gear that meshes with the girth gear. It is usually driven by a motor through a gearbox, which imparts the rotational motion to the kiln.

Rotary kiln thrust roller：The thrust roller is a critical part of the rotary kiln system. It serves the purpose of supporting the kiln's weight and maintaining its axial position, ensuring that the kiln remains properly aligned along its axis. The thrust roller is typically positioned on the downhill side of the kiln and is attached to the kiln shell. It consists of a central shaft or journal and a roller assembly.

Supporting Rollers: Supporting rollers are additional rollers placed along the length of the kiln to help prevent excessive deflection of the shell due to thermal expansion and other forces. They play a crucial role in maintaining the kiln's stability and alignment.

Refractory Lining: The interior of the kiln is lined with refractory materials to protect the shell from the high temperatures and chemical reactions occurring inside. Different sections of the kiln might have different types of refractories to withstand varying conditions.

Design principles of cement rotary kiln bearing housing

Auto-Molding: Tongli adopts automatic sand release system and sand recovery system, the ratio of resin and sand is fully automated, the molding effect is good, and the strength of the sand mold is high.

Advanced design: Unique design for the sand molding of steel castings. All millstone molds are used on the same day of manufacture to ensure that the sand molds are not damp. After the box is closed, a dehumidifier is used to ensure that the interior of the sand molds is dry.

Process control: Optimized the casting process of steel castings. The riser of the casting is 1.5 times larger than the traditional riser, and the riser is added at the position where the defect of the wire is relatively easy to exit.

Simulation software: Tongli used the simulation software to repeatedly verify the runners of the steel castings, combined with actual casting experience, and finally obtained the optimal casting process.

Outer Shell: The outer shell of the rotary kiln bearing housing is a robust and typically cylindrical structure that provides structural support to the entire bearing assembly. It is designed to withstand the mechanical forces and loads generated during the mill's operation.

Bearing Seats: The rotary kiln bearing seats are precision-machined surfaces within the housing where the actual bearings are mounted. These seats are designed to accommodate the specific type and size of bearings used in the mill.

Fastening Mechanism: The rotary kiln bearing housing is often equipped with holes, flanges, or other features to facilitate its attachment to the mill structure. Bolts or other fastening elements are used to secure the bearing housing in place.

Lubrication Channels: Some rotary kiln bearing housings have lubrication channels or passages that allow for the flow of lubricating oil or grease to the bearings. Proper lubrication is essential for reducing friction and wear between the bearing components.

Seals: Sealing mechanisms may be integrated into the bearing housing to prevent the ingress of contaminants, dust, and moisture that could negatively impact the bearings' performance.

Specifications of cement rotary kiln bearing housing

Note: *The diameter is the inner diameter, Weight excludes refractory material.

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Zhejiang Tongli Heavy Machinery Manufacturing Co., Ltd (Formerly known as Tongxiang Coal&Mining Machinery Factory) established in year 1958 is a member of the Chinese National Building Material Machinery Association. Tongli is on the vendor list of designated production enterprise of the Ministry of Coal Industry. ISO9001、ISO14001、ISO45001 certified, accredited as High-tech & new technology enterprise of Zhejiang Province. With 65+ years of experience, Tongli has earned first class R&D and manufacturing capabilities, dedicated to provide satisfactory manufacturing equipments for global customers.   

Industry Knowledge extension

What is the step Prior to the rotary kiln calcination?

The first step of making cement is the raw material crushing, conveying and storage. The limestone raw material from the mine needs to be crushed, ground and mixed, and the crushing process is carried out by cement crusher. When the maximum size of the input ore is ≤1600mm and the output particle size is ≤80mm, the limestone discharged from the crusher is then sent to the Φ80m circular pre-homogenization yard by the belt conveyor for pre-homogenization and storage.

What is the relationship between vertical roller mill and rotary kiln?

The rotary kiln is usually used as an intermediate process. The large raw materials are crushed by the crusher and then enter the grinding equipment for grinding. After being mixed with other raw materials, they are added to the rotary kiln for redox reactions. The calcined finished products need to enter the vertical roller mill or ball mill for secondary grinding to get the finished product.