Blasting hundreds of tons of ore in a split second is routine work in surface mines. Hydraulic systems power the rig's drill, crawler drives, cooling fans, tower hoist, and a number of other systems. The Pit Viper's 1,500-hp diesel engine drives a custom-built gearbox that splits power five ways to run the hydraulic pumps. But first, dozens of holes for explosives must be painstakingly drilled into the rock. One of the biggest drill rigs at work around the world is the 200-ton PV-351 Pit Viper from Garland, Tex. Sophisticated hydraulics and an innovative power-splitting system also make it one of the most productive, according to company engineers. The rig's 1,500-hp diesel engine or 1,400-hp electric motor drive a custom-built gearbox that runs five pumps from Parker Hannifin's Hydraulic Pump Div., Marysville, Ohio. The pumps, in turn, power virtually the entire machine. According to Ron Sarbach, a Parker technical support manager, the power-splitting setup saves a lot of space. Power-train components do not have to mount on the vehicle's centerline and, thus, can be positioned where they make the most sense. And hydraulics can deliver power efficiently anywhere on the vehicle with a length of hose or tubing, which removes practically all restrictions on placing key components. This let Atlas Copco's engineers optimize every major vehicle operation, says Sarbach. For example, a pair of Parker Denison P14 variable-displacement, axial-piston pumps — a design noted for durability and long service life — powers the drill. The units feature 14 in. /rev displacement and a 5,000-psi maximum continuous pressure rating, although they typically operate at 4,500 psi. "Using a pair of pumps instead of one large unit is more efficient because it eliminates a lot of valving," Sarbach notes. Drilling usually requires two hydraulic circuits — one rotates the drill while another feeds it
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Digital Counters
Digital counters are electronic devices that perform a variety of counting functions. They may count single actions, provide totalizing, or perform other calculations.
Logic Counters
Logic counters are integrated circuits used for counting events in computers and other digital systems.
Totes and Bins
Totes and bins are containers used for the storage and handling of parts and materials
Industrial Containers
Industrial containers are used for containing materials, shipping and storage. These containers include bags, basins, bins, boxes, buckets, crates, cylinders, drums, IBCs, tanks, and ISO containers.
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With all the complications that can turn your manufacturing process into mayhem, delivery of your contract-machined parts should be the last thing you have to worry about. With Burger & Brown...
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Topics of Interest
How do I reduce my parts handling time? The next step is closer and easier than you can imagine. The industry has embraced inline stress relieving to condense spring production time, but it still...
Overview
As machinists, how often are we asked to produce hardware that was needed "yesterday?" The fact is, quite often as shop personnel try to keep "squeaky wheels" greased. Squeaky wheels...
Being Organized
Having parts stored in proper containers and having them properly labeled helps the cycle counters do their job effectively and efficiently. Many times, odd-shaped parts can be...
Scheduling the Cycle Count Process
Once a full-scale cycle counting program is in place, it should be expected that all items will be touched at some time, at least once, during the year by a cycle...
13.1 Counting Events
Counting is a useful feature for any control circuit. We may wish to count the number of times a door has opened or closed, or count a number of pulses from a rotating disc. If...
