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Feeding demand for road base materials

Focused on growing customer needs for more than a decade, Lincom has become a key supplier of track mounted mobile screening and crushing equipment throughout Australia and Papua New Guinea.

Some of the latest processing equipment has been commissioned in one of south east Queensland?s largest open cut quarries. The combination of Terex Pegson and Powerscreen equipment has allowed the quarry to lift its production of 2.1 road base and still surpass the high specifications required in a project for Queensland?s Main Roads.

With tenders out, Lincom was one of only two parties who could supply the total package to meet the customer?s requirements. Stephen Watterson, assistant general manager for Lincom, said that he believed ?Lincom?s history and reputation in the market place for servicing machines without delay and our strong stock holding of spare parts in Brisbane and other interstate branches won us the contract?.
Mr Watterson added that having the right equipment and the ability to produce a 2.1 spec road base (100 per cent passing minus 25mm) from a very hard Hornfelds greenstone base material sealed the deal.

The blasted rock is fed into a Terex Pegson 1100 x 800 SHD jaw crusher (125mmclosed side setting or CSS), which has also been fitted with a rock breaker to ensure any larger material is reduced in size.  The 1100 x 800 is the ?M? series SHD single toggle jaw crusher, which has undergone extensive design and field work to deliver unsurpassed crushing performance under the toughest applications.
This versatile unit is suitable for primary operations and will achieve capacities of up to 450 tonnes per hour (tph) depending on the size and type of material being processed.

From the 1100 x 800, the crushed materials fed directly into the Terex Pegson 1300 Maxtrak. Based around the 1300 Automax cone crusher, the Maxtrak is able to take an ?all in? feed from the jaw crusher, thereby improving cubicity, throughput and reduction ratios. This machine has a maximum feed size of 200mm and a minimum CSS of 25mm,depending on the crushing pressures.

An added advantage of this machine is that adjustments can be made ?on the run?, using the touch button controls.  Dust suppression and a metal detector are included as standard features.  In this application the Maxtrak has a CSS of 29mm.

After leaving the Maxtrak, the material feeds onto the Powerscreen H6203R, a 20 x 6 three deck horizontal screen. The Powerscreen ?H? range feature horizontal screens ideal for handling high volumes of sticky material and for the exact fine sizing of high spec aggregates and road base.

The adjustable elliptical throw combines linear and circular amplitudes, producing an aggressive screening action.  The Powerscreen ?H? range is especially effective for screening after a primary or secondary crusher where they have outstanding performance when screening out specific small sizes.

The ?H? range includes the H5163 and the H6203 mobile units that have a quick set up time and includes four on-board stockpiling conveyors, giving four specific grades of material.

The top deck is fitted with a 25mm mesh and the plus 25mm material gets fed into a Terex Pegson 1000 Maxtrak in a closed circuit without the need for a separate stockpiling conveyor, thus leading to a more efficient process and space saver.  The CSS on this machine is 19mm.  
The middle deck is fitted with a 12.5mm mesh and is utilised only as a relieving deck which joins back up with the plus 5mm material to be fed into the Terex Pegson XV350 Vertical Shaft Impactor (VSI), maximising the fines content to achieve the 2.1 road base specifications.
The latest development in the Terex Pegson production line is the well proven Terex Canica 2050 GD VSI.  This powerful machine is driven by a 328kW Cat C13 engine via a self adjusting HFO clutch with a wedge belt drive, through a gear-driven countershaft assembly.
The VSI can be fitted with a variety of configurations depending on the requirements of the application.  The XV350 accepts a minimum size of 102mm, producing a maximum throughput of up to 350 tph depending on the application.

The minus 5mm is conveyed onto the final product stockpiler where it joins up with the product coming out of the VSI.  The fines transfer conveyor is an LP16/75.  It measures 16m in length, with a 750mm wide conveyor.

The final stockpiler is a LP16/120, also 16 metres long but with a 1200mm wide conveyor fitted with a Loadrite weigh scale and a modem to enable the quarry manager to view the tonnage of the plant from anywhere in the world.

The mobile track systems used on the Terex Pegson crushing and screening equipment allows it to be effortlessly moved into position, even in some of the more difficult configurations where space is at a premium.

The safety side of this layout should not be overlooked, with the excavator at the quarry blast face well away from the stockpile, where loaders can quickly and easily load the dump trucks for a more efficient and safe work site.

The complete assembly has the ability to be formed into the one train so there is not the need to move various size material from one site to another in order to blend.  When the demand for the 2.1 material to be delivered is often required to be quick and continuous from the quarry to the job site, it is vital that the equipment can handle the high tonnage outputs while maintaining the high specifications necessary. The Lincom Group understands this and that is why it is at the forefront of mobile crushing and screening equipment, working side by side with some of the largest quarries in the country.

Source: The Lincom Group

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