Fast work ... the Haggloader 7HR can load 2.5 cu m a minute.
Loader conquers limits of space
A Swedish construction and mining machinery giant has boosted its product portfolio with a new rubber-tyred digging arm loader while improving its range of ventilation fans and ducting system.
01 September 2010
GIA Industri has introduced a new compact, rubber-tyred digging arm loader designed for operating in confined spaces while enhancing its ventilation fan and ducting systems.
Available in two versions, the 7HR and 7HR-B Haggloader is designed for use in construction and mining tunnels and drifts with a cross section area of just 7 sq m. Designed for operating in tunnels with a width and a height of 2,500 mm, the 7HR has a loading capacity of 2.5 cu m per minute.
“It features two arm systems – digging arms or rotating backhoe – to load spoil/muck from the tunnel face directly onto the conveyor, which fills the haulage vehicle with a constant supply,” says a spokesman for GIA, adding that the conveyor can be raised and lowered to suit the loading heights of the different haulage vehicles. In addition, the backhoe version can also be equipped with a hammer for scaling blasted profile.
The Haggloader’s hydraulic system can be powered by a 45-kW electric motor or a Stage III Deutz 58 kW diesel engine including a silencer and catalytic converter.
The electro-hydraulic drive provides low installation and energy costs, while maintaining high air quality due to the absence of diesel exhaust. A built-in sprinkler system effectively controls dust. The diesel-hydraulic drive is also used for transportation and minor digging operations.
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SwedVent ... now quieter. |
Featuring a four-wheel traction pull of 7,200 hp, the 7HR also offers front and rear axle steering plus the ability to travel sideways in confined spaces. As an option, a backhoe digging attachment can be easily fitted for trench work.
The Haggloader’s chassis and conveyor are made of heavy-duty plates joined together with continuous welds for maximum fatigue strength. The digging system can also be repaired with standard sheet steel.
Control of the 7HR is by PLC via a LCD panel and joysticks. The driver operates the loader from a compartment with a protection roof which offers clear overall visibility of the loading sequence.
Ventilation fans
Meanwhile, GIA’s SwedVent ventilation fans now come with improved silencer design offering noise reductions of at least 3 dB(A) for the full range of fan motors rated between 10–500 kW to meet 75–85 dB(A) at 7 m. The improved sound damping has been achieved with a specially-designed silencer filled with processed mineral wool to reduce high frequency sounds.
The ventilation system features advanced impeller design incorporating a large hub, short blades and, accurately measured spacing between the blades to give the fan an enhanced ability to counteract high pressure systems. The dynamically-balanced impeller rotates in purpose-designed guide vanes to eliminate turbulence.
Individually adjustable aluminium blades allow the same fan to be used for a number of different tunnel conditions by adjusting the blade angle. For example, a 1,250-mm-diameter fan can be set to deliver 16–44 cu m per second. The fans are available in diameters of 630-2,240 mm and capacities of 1.5 to 200 cu m per second.
The SwedVent ventilation system also features flexible, PVC-coated polyester fabric ducting available in diameters of 300 to 3,000 mm and lengths of 10 to 200 m, to ensure a pliable, easy-to-handle duct, with a relatively low weight and highly durability. Increased tear strength is also assured with an enhanced yarn in the base fabric every second cm.
The flexible ducting system is also manufactured in two different standard qualities and two antistatic qualities, which meet SIS650082 fire resistance.
Both duct ends are fitted with a split, heavy duty, PVC-type zipper and made with protective flaps on both the inside and outside to ensure an absolutely airtight ducting.
“The ducting can be used several times on different projects, and, if it should fail, is very easy to repair. The airflow is shut off causing the ducting to collapse. A fabric repair sleeve is then applied to the damaged area and closed using its zip joint. When the airflow is returned the sleeve stays firmly in place,” concludes the spokesman.
