Engineering & Mining Journal

JUL 2019

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SHOTCRETE 28 E&MJ • JULY 2019 www.e-mj.com SmartDrive is designed for companies transitioning to a "new era of sustain- able underground operations," the com- pany reported. It is comprised of battery technology, direct-drive architecture, and charging technology. The benefits are numerous and in- clude no local emissions, an extensive range, fast charging capability, lowered noise level, and lower operational costs to include reduced ventilation and cooling needs, the company reported. "One of the key answers that SmartDrive brings to the table is it allows us to work at a much higher altitude or to a greater depth," Mark Ryan, vice president, equip- ment offering, research and development, Normet Group, said. Such will be critical going into a future where, "resources are getting harder and harder to come by." Ryan said SmartDrive speaks to the pressing needs of miners today. "We don't need to bring fuel underground for this machine," he said. It offers more speed and higher performance," and is otherwise "more efficient than a diesel counterpart." Samu Kukkonen, technology director at Normet, said the lithium ion batteries were selected to be "as safe as possible, as durable as possible, and then fast- charging capable." Fast charging typically means tens of minutes, he said. "This charging system is based on the industry standard used in automotive applications," he added. The typical charging time using the standard onboard charger spans roughly 150 minutes, Kukkonen said. In contrast, the 40-kilowatt (kW) CT40 charger takes 95 minutes. The 300-kW CC300 charger takes as little as 20 minutes. Each machine features an onboard charger, cable reel and industrial AC socket. "It doesn't matter what the volt- age is: 1,000 volt, 400, 600, 9,600," he said. "We can fit all voltage ranges, 50 hertz or 60 hertz." The direct-drive architecture on the Spraymec 8100 VC SD leverages two 75-kW permanent magnet motors, one per axle. The gear box and drop box are eliminated. "The combined power rating is 200 kW and this will give you double the speed for uphill driving." The redundancy helps maximize up- time, he said. "Should there be a mal- function in one of the motors, you can still continue driving with the second mo- tor until you can service the malfunction- ing motor," Kukkonen said. "The same is true for the batteries as well. If there is a rare occasion that there should be a malfunction in the battery, the system will automatically isolate that part of the battery and you can still continue driving the machine." Kukkonen said SmartDrive had been "comprehensively onsite tested" during the course of "months of site testing near our factory." On the market for years, the Spraymec 8100 features IoT and automation capa- bilities. The SD units will offer greater "energy efficiency and lower operational expenses," Ryan said. Normet also showcased the Smart- Scan 3D laser scanner, which mea- sures concrete thickness "instantly af- ter spraying," the company reported. It "allows operators to calculate and mon- itor the applied shotcrete thickness and volumes automatically." The margin of error is as little as 5 millimeters or less, the company reported. The solution is offered as an add-on to new equipment or as a retrofit. The offerings illustrate the compa- ny's dedication to developing solutions and services designed to improve un- derground mining processes, Ryan said. "Process ownership is one of the key cor- nerstones of our business," he added. Compact Machines for Narrow Ops In 2018, Putzmeister launched the Wet- kret 4 and Mixkret 3, designed to be de- ployed in tandem. Both feature capabili- ties that speak to the needs of narrow vein mining ops, Santiago Lopez, head of sales, underground division, Putzmeister, said. The Wetkret 4 leverages a heavy-duty 2.2-m-wide chassis capable of a tight turning radius, the company report- ed. Spraying arms are offered in two lengths. One offers a maximum vertical reach of 10 m. One offers a maximum reach of 7.5 m. Spraying is managed using cable or radio remote control, the company re- ported. The controller can be used to regulate the concrete flow and adjust the additive dosage. Most important, however, is the pump, Lopez said. "Putzmeister has Above, a prototype Spraymec 8100 VC SD concrete sprayer, which is described as more efficient than its diesel equivalent. (Photo: Normet) The CT40 (left), CC300 (middle) and CC150 (right) can recharge the system in minutes. (Photo: Normet)

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