Thern built a 56,000-lb-capacity winch with a modified dual compartment drum able to facilitate two separate two-part rigging lines. Using two-part lines doubled the load lifting capacity of the winch to accommodate the 100,000-lb-capacity necessary to lift the counterweight. This relatively simple and straightforward modification provided an economical solution to achieve the power needed for the mine's application. The dual drum configuration, with two separate lines, provided redundancy.
To facilitate this two-part rigging, the winch was mounted above the counterweight at the top of the counterweight take up tower. For more convenient operation, the winch was equipped with a 50-ft pendant control to allow workers to control the winch remotely. Additionally, the winch's durable construction and epoxy finish meant that it could withstand the harsh environmental conditions at the top of the tower, minimizing maintenance time and cost.
For more information on Thern winches in bulk handling and mining applications, visit www.thern.com.