|Material||ASTM: 1045 / DIN: CK45|
1.High strength and excellent durability.
Great Wall Casting adopts ZG45 and ZG42CrMo to manufacture the kiln tyre to guarantee its strength and toughness, so as to support rotary kiln well.
2.The advanced process of double medium quenching enhances strong adaptability
After double medium quenching, each part of the rotary tyre is forged evenly. It has characters of high stiffiness on quenching, high toughness, and good wear resistance, suitable for various bad working environments.
3. Rotary tyre has simple structure and easy to manufacture and maintain.
The importance of kiln tyre:
The purpose of kiln tyres and support rollers is to support the kiln and allow it to rotate with minimal friction. Rotary kilns are among the largest items of permanently moving industrial machinery, the largest examples weighing in their fully-loaded form several thousand tonnes. Despite the challenges of their size and their high temperature, the best examples of rotary kiln rotate on their rollers almost frictionlessly, the power supplied by the drive being almost entirely in order to oppose the eccentric load of the contents of the kiln. On cutting the power to a kiln, the kiln will “roll back” and unless a brake is applied, will continue to swing like a pendulum for ten or fifteen minutes before coming to a standstill. This finely-tuned mechanical condition requires sophisticated design of the kiln’s supports.
How to replace the kiln tyre:
The kiln tyre itself is usually a single steel casting, machined to accurately circular dimensions and with a mirror-smooth texture on all surfaces. Early tyres were occasionally produced as half-sections that could be easily assembled and replaced, but this was very soon abandoned because of the resulting rapid and erratic wear at the joints.
In the standard design, the kiln tyre was mounted loosely on the kiln shell. Inevitably, the tyre is cooler than the kiln shell, and so a small gap allows differential expansion to take place. The gap is usually designed to be about 0.2% of shell diameter at normal operating temperature. The kiln tube bears down upon the inside of the tyre through smooth-surfaced chairs which also have lugs bracketing the tyre, preventing it from slipping along the kiln axially. The spacing of the chairs also reduces the amount of heat conduction from the kiln shell to the tyre. The tyre needs to remain relatively cool because so large a casting would be unlikely to survive a large radial temperature differential during heating up of the kiln. Another effect of the gap is that tyres would gradually precess around the kiln, with one complete turn in every 500 turns of the kiln. Measuring the rate of precession was a rough-and-ready way of assessing the width of the expansion gap while the kiln was in operation. Small changes due to wear could be adjusted by adding shims.
Kiln tyres manufactured by Great Wall Steel Casting have been exported to many countries abroad, including Italy, Turkey, and Chicago.
Great Wall Steel Casting can manufacture all types of rolling tyre according to customers’ drawings and sizes. You are warmly welcomed to visit our company!