Kiln Tyre

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Types of kiln tyre

According to the shape of cross-section, we can classify rotary kiln tyre into two types:

Rectangular kiln tyre

The cross-section of rectangular kiln tyre is filled rectangle, simple and quality is easy to guarantee, generally, its’ service life is longer than that of boxed one, and widely applied in the rotary kiln. However, the rigidity of rectangular kiln tyre is relatively small, it also has disadvantages of unreasonable material utilization and poor heat dissipation conditions.

Box kiln tyre

Its section is a hollow box, with good thermal conditions, high rigidity, and reasonable material utilization. The integrated structure of the kiln tyre and the rotary kiln body can avoid the “necking temperature stress” between the kiln tyre and the rotary kiln body. It also enables the kiln tyre to give full play to the reinforcement function of the simplification, and at the same time, the material of the kiln tyre is rationally used, which simplifies the manufacturing and installation work and is easy to operate.

Installation of kiln tyre

The modern new dry process rotary kilns all loop kiln tyre on the rotary kiln body with appropriate clearance. The kiln tyre are not directly installed on the rotary kiln body section during specific installation, but are installed on the backing plate, so that the a natural ventilation channel is formed between the body and the kiln tyre. On the one hand, the heat dissipation is strengthened, on the other hand, the heat conduction from the kiln body to the kiln tyre is reduced, so that the temperature difference between the inner and outer edges of the kiln tyre is small. When the thermal system of the kiln changes, the temperature difference won’t change much, thereby reducing the temperature stress of the kiln tyre, when the kiln is running, the kiln tyre and the kiln body will slide relatively to each other in the circumferential direction, causing wear, and the backing plate plays the role of protecting the kiln body.

In order to ensure the design clearance and good contact between the kiln tyre and kiln body, the inner circle of the kiln tyre and the outer circle of the backing plate need to be machined. On both sides of the kiln tyre, baffles or retaining rings are used to limit the axial movement of the kiln tyre along the rotary kiln body.

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