Improved design ensures reliable ball mill operation

Great wall has 40 years ball mills installed experience, our customers worldwide benefit from this extensive experience that ensures a smooth trunnion replacement. Knowledge gained over the years is used for product development and to further improve the supervision and installation services offered around the globe.

High-quality vital mill components

Ball mill trunnions and heads are subject to large alternating stresses during operation. Even though ball mill trunnions are designed for infinite life, there is always a risk of cracks developing due to small casting defects, wear of the inner surface of the trunnion or other damage, such as cutting scars or welding in the high-stressed areas.

To avoid premature failure of such vital mill components, very high quality manufacturing procedures must be used. Great wall only uses trunnions manufactured by a limited number of highly qualified foundries, ensuring the final quality meets the highest standards.

Continuous operation

If wear or a crack is discovered in a trunnion, great wall can provide provisional on-site repair so that the mill can keep operating until a new trunnion is supplied. Any weld repair of a trunnion must be considered as a temporary solution since new cracks will most likely develop and the repair can result in trunnion deformations, which can cause bearing problems and eventually lead to bearing failure. Therefore, it is strongly recommended to order and install a new trunnion as soon as possible to ensure continuous and reliable mill operation.

Supervision and installation services

Due to the complexity of a trunnion replacement, plants should make full use of the expert supervision and installation services. To facilitate a trunnion replacement, it is recommended to have a new bearing liner and trunnion liner on stock. Great wall on-site services include providing experienced supervisors, certified fitters and welding technicians, as well as all the necessary tools and equipment transported to the site.