News Date:2021-12-23 10:46:43
Rotary kiln tyre is a large round steel casting. Most of it is used in rotary kiln equipment. Due to its large volume, long production cycle, large force, large torque and other factors, once the rotary kiln tyre appears quality The problem not only increases the maintenance cost of the enterprise, but also causes the kiln to be shut down for replacement, which affects the completion efficiency of the finished product.
Rotary kiln tyres are large-scale steel castings, which inevitably have casting defects such as sand holes, slag inclusions, and inclusions. According to investigations, most of the origin of cracks on the inside of the rotary kiln tyre are sand holes and slag. Under normal circumstances, the kiln is shut down for maintenance, and the temperature of the rotary kiln body is reduced from 150-300℃ to atmospheric temperature. The entire rotary kiln body will be shortened, causing uneven internal stress in the rotary kiln tyre. The rotary kiln tyre and the rotary kiln tug The point of action has changed. The sudden start of the cold kiln caused brittle fracture of the tire belt that was in a low temperature brittle state. Low-temperature brittle fracture of rotary kiln tyres occurs mostly in winter and spring.
From the above description, it can be concluded that the rotary kiln tyre is under low temperature conditions, and the smaller stress is enough to cause brittle fracture of the rotary kiln tyre.
Therefore, when the equipment is overhauled or medium repaired, avoid seasonal months when the temperature is below 0°C as much as possible. Even during maintenance in winter, it is forbidden to rotate the rotary kiln body suddenly without preheating at low temperature. When the rotary kiln body must be rotated, heating measures should be taken at the tyre of the rotary kiln so that the temperature of the tyre is not lower than 0°C before the kiln can be rotated.
In order to enhance the performance of the rotary kiln tyre, Xinxiang Great Wall adopts advanced dual-medium quenching process in the casting process, and each part is forged uniformly. It has the characteristics of high quenching hardness and high toughness, making the rotary kiln tyre good Its wear resistance can adapt to various harsh working environments.
