Rock Products

MAY 2019

Rock Products is the aggregates industry's leading source for market analysis and technology solutions, delivering critical content focusing on aggregates-processing equipment; operational efficiencies; management best practices; comprehensive market

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50 • ROCK products • May 2019 EQUIPMENT & TECHNOLOGY LOADOUT & DRONES Since 1973, Herman's Trucking Co. has been serving the Bur - lington County area in Central New Jersey. With a sizeable fleet of more than 25 dump trucks, the company hauls every- thing from landscaping material to construction products. Commonly transported loads include slate, flagstone, rocks, limestone, recycled aggregate, dirt and sand. Material buildup on the walls, floor and tail gate of the truck bed can reduce the capacity of each load, extending unload- ing time and reducing efficiency. "Sand and gravel need to be absolutely cleaned out after every load," said Bruce Stelljes of Herman's Trucking Co. "The driver has to make sure the truck body is clean and if it isn't, he or she has to get up there and hammer on the truck body or even climb into the bed with a shovel and manually dislodge any remaining material." To address the problem, they began to use a heavy-duty Cougar DC 2500 Truck Vibrator from Martin Engineering. After six years, the high-performance 12-volt Cougar vibrator is still going strong, helping the company avoid the expense of frequent replacement and the associated downtime. The units have been so successful and reliable that company officials are now replacing other vibrators with the Cougar designs whenever a failure occurs. "We first discovered the Cougar vibrators about six years ago, when we received a new truck body equipped with a Cougar 2500," Stelljes continued. "We noticed that the unit consistently delivered the force we needed without burning out." Stelljes said that original unit is still working like new. "At the time, we didn't know much about truck vibrators," said Stelljes. "We had purchased new trucks that had another manufacturer's vibrators installed on them. But after just a year or so in service, those units started going bad." Stelljes said they either suffered from a reduced output or stopped working altogether. Operators originally swapped the failed vibrators for new ones by the same manufacturer, but the short equipment life persisted, resulting in drivers again having to take measures to clear the material. After seeing the side-by-side comparison of performance and equipment life between the Cougar DC 2500 and the competing units, the company decided to exclusively use the Cougar designs. "The true cost of these vibrators is directly dependent on how long they last," explained Martin Engineering Mobile Market Manager Allen Twidell. "The Cougar family of truck vibrators includes heavy-duty windings and insulation, with bearings lubricated for life and sealed inside a weatherproof housing." The motors are custom-built to Martin Engineer- ing's specifications, ensuring the highest level of quality control. The units also carry a two-year warranty, which is double that of other 12-volt truck vibrators. "We've found that some competing designs don't actually achieve the forces claimed by the manufacturer," Twidell con- tinued. "In contrast, our units generally put out more energy than the model numbers indicate." The Cougar lineup of DC truck vibrators also includes a larger unit, which puts out a whopping 3,700 lb. of force. Placed on the upper spine of the truck bed's support frame, the compact unit on Herman's trucks requires minimal space. The design is only 10-3/8 x 9-3/4 x 6-7/8-in. in size and weighs just 36 lb. due to the lightweight aluminum housing, which results in a high output to weight ratio. Drawing just 55 amps, the powerful vibrator delivers 2,500 lb. of force at 4,000 rpm. Competing products typically draw much more current (well in excess of 100 amps), which means the Cougar units produce less drain on the truck's electrical system. The duty cycles are also longer, generating less heat, which contributes to their long life. Along with a safer work environment, the reliability means no unexpected interruptions to the workflow from a failed vibrator. With the complete evacuation of cargo, 100% of each load is delivered efficiently to the jobsite, reducing labor and risk. All of this translates to a lower cost of oper- ation and greater return on investment. "Now we use one brand of vibrator, and they only need to be installed once," Stelljes concluded. Martin Engineering, Martin Engineering Truck Vibrator a Benefit for Herman's Trucking

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