MTA-AUS 2014

CONEXPO-CON/AGG VIP SHOW GUIDE contains Floor Plans and a complete listing of companies exhibiting at the ConExpo-Con/Agg 2014 trade show in Las Vegas March 3-7, 2014. It also contains 2014 forecasts for the Aggregate, Concrete and Cement industries

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60 VDMA | 2014 VDMA MINING SUPPLEMENT VDMA bar (max.). Design engineers again focused on service and the inter- changeability of spare parts. The check valve and 2/2-way valve in the Kamat unloaders are fully interchangeable. Mechanical and electro- hydraulic versions are available. The mechanical pilot valve may be fitted with only four bolts onto an electro-hydraulic unloading valve if the electronic control system is down. This assures super ior availability of the pump system. An unloading valve has to act quickly to control the line pressure to the face reliably. This means that certain pressure shocks will remain— increasingly with bigger flows. Kamat pioneered big flow pumps in coal mines and introduced VFDs for longwall pumps underground. Several in- stallations proved that a VFD-driven longwall pump increases service in- tervals and a vailability impressively. The VFD eliminates pressure shocks by simply changing the pumps drive speed if the longwall changes its flow demand. This is also reflected in a much more stable pressure as the VFD reacts to even 1 bar change in pressure. Pumps controlled by unloader valves will only react if the pressure drops or rises out of its scan. VFDs eliminate the unloading action com- pletely. The pu mp is running smoother and the entire network—the hoses, pipes, flanges, etc.—is facing much less stress. The overall reliability of such a system improves significantly. In one of its installations, Kamat claims the VFD-controlled pump hasn't been repaired for 4.5 years. In these arrangements, Kamat only uses one VFD per pump system— no matter how many pumps are installed—due to the wide regulating ra nge of its gearboxes. Using one VFD per system also holds costs down. Flow requirements for longwalls seem to constantly increase. Adding more unloading-valve-controlled pumps with boosters was be- coming complicated and the systems were struggling to control pres- sure. Modern Kamat systems are equipped with one to three big pumps (no boosters) controlled by a single VFD. Giving Miners What They Want For more than 20 years, miners have relied on the MinCa, short for mining car, as a dependable form of transportation under- ground. Manufactured by Emsbueren-based Hermann Paus Maschinenfabrik, it is a front-steered, all-wheel-drive vehicle for transporting miners and materials (payloads up to 4 metric tons). It features a number of add-on cassettes, such as passenger cab- ins, crane platforms, and tank and service units, to meet specific customer requirements. While its robust design and relatively low service weight (7 mt) are important features, the MinCa can also transport up to 18 people when used as a sole passenger vehicle. The ultra-compact vehicle measures 5.8- x 2- x 2.1-m (L x W x H) and it can make a 90° turn with an entry width of only 4.3 m or less. A further reduction in the turning r adius is possible with an optional four-wheel steering system. The MinCa is powered by a 90-kW Deutz engine, classified as COM II and IIIa in terms of exhaust emissions, with which it can achieve speeds of 33 km/h. The hydrostatic drive is a plus for inclines where it can reach high speeds with optimum efficiency without the need to change gear. The Paus MinCa's climbing ability is around 60%. A hinged driver's cab can be tilted forward using a manual pump to pro- vide ease of access to the engine and hydraulic components for repair. Even though Paus has been building this type of chassis for 10 years, the company believes it has now made an additional leap forward with the new chassis for the MinCa. Both the steering axle as well as the rear axle are oscillating (±12°), by which two trail- ing arms and wishbone arms are suspended on the vehicle chas- sis, the result is all tires remain in contact with the ground even with poor under-foot conditions. Impacts to the chassis and cabin are attenuated by springs and shock absorbers. The springs are tensioned at the ends of the axles between the axle and the chas- sis and shock absorbers are fitted between these springs and also between the axle and the chassis. Further features of the chassis include the end position stop, catch ropes and rubber buffer for the cab mount. Before its launch, the MinCa with its new and innovative chassis was extensively tested and comprehensive measurements were taken on the ATP test track for off-road vehicles in Papenburg. A video is available at: This is a prime example of their motto: listening to the customer and providing them with exactly what they need, explained Franz- Josef Paus, managing director, Hermann Paus Maschinenfabrik. "Some mines are having more difficulties than others maintaining profitability and controlling costs," Paus said. "We provide equip- ment engineered for their conditions, their expectations, and their way of working, rather than a standard product, which is not opti- mize d for the application." As an example, Paus offered a hypothetical situation where an un- derground mine needed a fleet of dumpers. The standard 20-ton units are too big. The standard 10-ton units work, but the cycle times are in- efficient. "In that case, Paus would build a fleet of 15-ton dumpers for that mine," Paus said. "The custom machines would probably be a little more expensive than the standa rd units, but there would be other benefits in terms of cycle times and fuel savings." Many mines demand the latest technology, such as electronically controlled engines, while others do not. "Some regions do not have the maintenance skills or the fuel quality for electronic controls, and we can supply equipment for those mines," Paus said. Increasingly, Paus cautions, it's becoming more difficult to f ind components with low lev- els of electronic parts. Engine and pump manufacturers do not always supply two types of components. "This is one of the areas where we excel—knowing what miners from different regions want and understanding the variety of components available, as well as the legal issues surrounding their use," Paus said. Next year, Paus will launch a new smaller utility vehicle at Expomin in Santiago, Chile. "We recently overhauled our PFL8 loader," Paus said. "We introduced Canbus systems. It's not a new development, just con- tinuous improvement of an existing product along with a new z-linkage and engine." Paus employs 300 craftsmen and they have a wide range of com- petencies. When it comes to providing solutions, they also benefit from cross pollination by applying technology or co mponents they use on the construction side for mining and vice versa. "Miners ap- proach us with a situation and oftentimes we can provide a tailored solution," Paus said. One example is the company's new concrete spraying train. The rail- mounted vehicle consists of a concrete sprayer with diesel-powered concrete spray machine (BSG 8) and a concrete mixer trailer (BTG 4) fixed to the spray machine. A c oncrete mixer and a concrete pump are fitted on the concrete mixer trailer. The material is conveyed from the concrete pump to the spray nozzle through a hose and sprayed with the aid of compressed air. The MinCa can carry 18 underground miners to work and back.

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