Belt Replacement at a Long Distance Pipe Conveyor at the Skyline Mine

Conveyor Maintenance

Belt Replacement at a Long Distance Pipe Conveyor at the Skyline Mine

Belt Design, Installation and Power Measurements
When the Arch Western Coal Skyline Mine decided to replace the old belt of its long distance BC-8 pipe conveyor, a new belt had to be designed to be suitable to the existing routing. In addition, a special installation procedure had to be developed to minimise downtime during the belt installation and commissioning.
(ed. WoMaMarcel - 18/10/2014)
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Fig. 7 shows the principle of reeving the belt prior to the belt pulling. The access to the idler frames and the pipe conveyor belt was very limited because the conveyor system is mainly installed in fully covered trusses and galleries.


Fig. 7: Scheme of the belt reeving setup.

The belt was shipped in eight reels, a total of 6940 m. The pipe belt was pulled from the belt reel through the splice shed and reefed in approx. 75 layers, resulting in a belt stack of approx. 1.5 m height (Figs. 8 and 9). In order to reduce friction forces between the layers while reeving and pulling the belt, each belt layer was separated by a layer of sand. Reeve tubes were installed to protect the belt from a sharp bend where the belt folded back on itself (Fig. 10). For this pipe belt, a special splice design was used that differs dramatically from designs for standard troughed belts. Before starting to pull in the new pipe belt, Contitech estimated resistances to motion and checked if the installed total drive power was sufficient to pull the final section of the new pipe belt onto the system. Figs. 11, 12 and 13 give an overview of the setup for the belt pulling into the conveyor system.


Fig. 8: The new belt is layed out in layers parallel to the conveyor.

Fig. 9: Reeving of the belt with a winch.

Fig. 10: Installed tubes in belt folds.

Fig. 11: Scheme of pulling the belt into the conveyor structure.

Fig. 12: Pulling the new pipe conveyor belt into te conveyor structure.

Fig. 13: Pulling the new pipe conveyor belt into te conveyor structure.

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