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P&Q University Lesson 6: Off-Road Hauling
In most aggregate operations, off-highway trucks provide the production link between the loading face in the pit and the primary crusher or processing plant. Efficient haulage is critical both to meeting production targets and to managing costs. Proper selection and sizing of trucks, efficient operation and timely maintenance, and well-designed and maintained haul roads are the keys to productive and low-cost haulage. RIGID FRAME VERSUS ARTICULATED There are two main kinds of haul trucks: Rigid frame and articulated. Though each type hauls material, the two different truck configurations have different strengths that suit the machines for most efficient operation in different site conditions. No matter what the choice of hauling system is, the machines must perform or participate in several functions: loading, hauling, dumping and returning. Each type of hauling unit has advantages in some parts of the cycle and disadvantages in others, depending on the site conditions. Photo by Joe McCarthy All trucks require the use of a loading tool, and of course the loading machine and trucks must… Keep Reading
Another take: Crusher safety
Kelly Graves, senior technical sales manager at Kleemann, offers his thoughts on crusher blockages and some solutions that have helped to minimize the problem over the years. P&Q: How much of a problem are crusher blockages today, and how does the procedure of clearing a crusher today compare with clearing one in the past? KG: Blockages create downtime, which lowers production and decreases tons per man-hour. With the advancement and increased use of hydraulics, downtime is greatly reduced. Compared to the old-style machines utilizing mechanical devices to open the crushing chamber, the hydraulic machines are much faster and more importantly safer than machines of the past. Clearing blockages on a newer hydraulic machine can be as simple as pushing a button on the crusher control cabinet or remote control, or reversing the motion of the swing jaw with the flip of a switch. P&Q: How do you and Kleemann work with customers to address the blockage issue? KG: We try to teach producers and recyclers the importance of material prep… Keep Reading
Video: Bucyrus-Erie 195-B shovel in action
https://youtu.be/LtcDyyUTgOc Bucyrus-Erie's 195-B is a 14-cu.-yd. shovel. It was introduced in 1968 and made until 1976. This video was was compiled, narrated and produced by Keith Haddock for the Historical Construction Equipment Association. Keep Reading
Mobile cone crushers offer fuel-efficient operation
The new Mobicone MCO 9i EVO/MCO 9i S EVO mobile cone crushers from Kleemann offer aggregate producers high-productivity secondary or tertiary crushing in a Tier 4 Final emissions-compliant machine. The S-version of the MCO 9i EVO provides a discharge conveyor-mounted final classifying screen with oversized aggregate return conveyor. This permits a closed material cycle and production of final particle sizes without a standalone screen. In lieu of hydraulic drive, the MCO 9i EVO/MCO 9i S EVO’s diesel-electrical drive provides low fuel consumption in a compact design. Its power plant generates 332 hp at 1,500 rpm, while its 37-in. cone crusher diameter permits a raw feed capacity of 287 tph, with a feed size maximum of 8.25 in. The feed hopper standard feed opening is approximately 8 ft., 3 in. wide x 11 ft., 2 in. long. With extensions, the feed opening expands to 8 ft., 7 in. x 12 ft., 6 in. Its vibrating feeder is 40 in. x 6 ft., 11 in. www.kleemann.info Keep Reading
Video: Bucyrus-Erie 60-S swing shovel
https://youtu.be/xg2bmYRVel0 Bucyrus-Erie's 60-S swing shovel, introduced in 1970, was designed as a cross between a crawler loader and a hydraulic shovel with the hopes that it would integrate both the high mobility of a loader and the high breakout force of the shovel. This video was was compiled, narrated and produced by Keith Haddock for the Historical Construction Equipment Association. Keep Reading
Portable system mounts on low-profile boom
Allied Construction Products LLC has added the PowerPortable boom system to its Pedestal Breaker System full-product line. It can be used with stationary or wheel- and track-mounted mobile crushers. Built around Allied’s Rammer, AR Series and Hy-Ram hydraulic hammers, the 350 to 1400 class hammers are mounted on a low-profile boom that adds minimal height and weight to the crusher. The boom offers reaches of 10 to 15 ft., allowing the PowerPortable boom system to reach both the crusher and feeder, if necessary. The system is powered by 20- to 30-hp units (depending on the hammer selected). To eliminate the weight of an additional power unit, the PowerPortable boom system is often connected directly to the crusher’s hydraulic circuit. Its functions are controlled through a system of valves. www.alliedcp.com Keep Reading
Cage mills offer high-size reduction ratios after a single pass
Stedman Machine Co. is promoting its “One-N-Done” cage mill line by re-educating process engineers about the design aspects of cage mills. Cage mills are capable of high-ratio size reduction with no decrease in the quality of the product, even after long periods of operation. High size reduction ratios offer cost savings in handling, maintenance and wear parts. Cage mills reduce materials by impact using nested cages with rows of impact bars. The cages, consisting of two, four or six rows, are arranged concentrically, with each row spinning in the opposite direction. The material is fed into the center of the innermost cage, where it is struck by spinning rows of cage pins and distributed 360 degrees around the cage. Properly presetting the speed of the cages allows the succeeding rows, moving from the innermost outward, to act principally on the particles that have not yet been reduced to the desired size. www.stedman-machine.com Keep Reading
Video: Bucyrus-Erie 20-H hydraulic excavator
https://youtu.be/tU3UjJHYVpY The Bucyrus-Erie 20-H hydraulic excavator was the first in a new line of hydraulic excavators from the company. Launched in 1965, the 20-H was the company's first fully hydraulic machine. This video was was compiled, narrated and produced by Keith Haddock for the Historical Construction Equipment Association. Keep Reading
Cone crusher designed to increase uptime
The new 500-hp Cedarapids MVP550X cone crusher from Terex MPS features a patented Rollercone design, which along with the super bearing, increases efficiency—making more horsepower available for crushing. Major new enhancements include high-speed clearing of jammed material and quick crusher separation capability for faster manganese changes. At the press of a button, fully guided dual-action tramp relief cylinders provide 6 in. of lift for easy clearing of jammed feed material. The hydro-pneumatic tramp iron relief system instantly resets the crusher setting after passing uncrushable material without having to activate valves and pumps. A high-flow manifold system with multiple accumulators provides redundant cylinder protection. The hydraulic-powered threaded upper assembly allows for quick crusher setting adjustment under load. www.terexmps.com Keep Reading
