In mining and industrial bulk material handling systems, large rubber conveyor belts play a critical role in continuous transportation of materials such as ore, sand, coal, and aggregates. However, during long-term high-load operation, conveyor belt problems such as belt misalignment, edge cracking, and uneven wear are commonly reported, which can significantly affect production efficiency and system stability.

This case study shares a real application scenario where a mining company experienced multiple operational issues with their conveyor belt system, and how the problems were diagnosed and resolved.

A mining customer had been operating a large rubber conveyor belt system for approximately three months when several issues began to appear. The belt started to show continuous tracking deviation during operation. At the same time, edge cracking and material loss were observed on both sides of the belt. Certain sections also experienced accelerated and uneven wear. As the situation worsened, the system began producing higher operating noise and increased energy consumption.

Despite repeated adjustments to the tensioning system, the problem kept recurring, which raised concerns about possible early belt failure and production downtime.

After on-site inspection, engineers found that the issue was not caused by a single factor, but rather a combination of mechanical installation accuracy, material feeding conditions, and tension imbalance.

Firstly, some of the idler rollers were slightly misaligned, which generated continuous lateral force on the conveyor belt during operation, leading to persistent tracking deviation. Secondly, the material feeding point was not properly centered, causing ore to consistently impact one side of the belt, accelerating edge wear and fatigue damage. Thirdly, uneven tension distribution between the left and right sides of the belt further intensified the misalignment problem.

Due to prolonged operation under these abnormal conditions, micro-cracks gradually formed on the belt edges. Over time, these cracks expanded, resulting in visible edge damage and material shedding.

To resolve the issue, a systematic correction plan was implemented. The engineering team first re-aligned the idler frames and adjusted the parallelism of the pulleys to ensure proper belt tracking. Then, a material guiding structure was installed at the feeding point to ensure that bulk material was evenly distributed to the center of the belt. Finally, the tensioning system was recalibrated to ensure balanced force distribution on both sides, and a routine inspection standard was established to prevent recurrence.

After the optimization, the conveyor system performance improved significantly. Belt tracking deviation was effectively eliminated, edge wear was greatly reduced, and overall operating noise decreased noticeably. Energy consumption returned to normal levels, and system stability was restored.

The customer confirmed that the conveyor belt system returned to stable operation and potential premature belt replacement was successfully avoided, saving significant maintenance and replacement costs.

Conclusion

This case demonstrates that problems with large rubber conveyor belts are rarely caused by material quality alone. In most industrial applications, issues arise from a combination of installation accuracy, material loading conditions, and maintenance practices.

Proper control of idler alignment, centralized material feeding, and balanced tensioning are key factors to ensure stable operation and extend the service life of conveyor belts in mining and industrial environments.