Bowen Basin, QLD, Australia
Make & Model
Draglines continue to be a critical element in hitting production targets for many coal mining operations. Reducing maintenance requirements is essential to increase up time, lower costs, and decrease safety risks. Dump rope change-outs are one regular maintenance task that can significantly impact machine up time and production.
For over a decade, CR Powered by Epiroc’s heavy-duty dump blocks have set the industry standard for durability and long service life. Their robust bearing and axle assembly, optimized cast side plates, hardened sheave, and optimized rope groove profile all contribute to making them the most reliable dump blocks available today.
CR worked with the customer to upgrade their existing dump blocks and dump connecting link assembly from a traditional straight ear configuration to a high-performance twisted ear design.
The new configuration allows for more dump block side-to-side movement, improving dump rope tracking and connecting link wear.
The new sheave profile has been rolled out on all new CR dump blocks and is compatible with black rope. Combined with twisted-ear updates new blocks are also seeing a substantial improvement in dump rope life, allowing customers to space scheduled dump rope changes further out.
P48TW-83 Dump Block
Record campaign life
Less down time
The new dump blocks have achieved record-breaking campaign life, increasing campaign life from 18 million BCM to 32 million BCM, an increase of 77%.
As the dump rope life increased by 33%, the site was able to push out scheduled change outs from every seven days to a 9-10-9 day schedule. Not only did they save on maintenance down time, but the new schedule also aligned better with planned maintenance days, driving improved dragline availability.
Change out timing for dump connecting links has also been extended from every two months to every six. The result: saving approximately AU$37,000 per dragline each year.
All of this has added up to a significant reduction in maintenance time and labor for dump ropes and connecting links: approximately 300 man-hours each year.
- Campaign life of 32 million BCM, a 77% increase
- Dump rope life increased 33%
- Savings of ~AU$37,000 per year per dragline, a total of $185,000 across the fleet
- Reduced maintenance labor by ~300 man-hours per year
The mine site has been so pleased with the improvements that they have implemented CR’s twisted ear dump blocks on all five of their conventional draglines, resulting in a savings of AU$185,000 each year.
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