Six of the best for crushing specialists


WILLOWTREE Site Services is a contract crushing and screening specialist which is in partnership at Coxhoe Quarry in County Durham with owners and operators Hope Construction Materials, an independent producer of cement, concrete and aggregates.

Willowtree has been a Blue Machinery Scotland customer since the company bought its first Powerscreen rinser a couple of years ago and, during the past few months, the firm has made a major investment with Blue purchasing six Powerscreen crushing and screening plants.

These productive, crawler-mounted, mobile machines are now working the top bench at Coxhoe Quarry, crushing, screening and stockpiling around 350,000 tonnes a year of size-specified limestone aggregates and agricultural lime.

The Powerscreen set-up at Coxhoe is comprised of a Premiertrak 400 jaw and 1000 Maxtrak cone crusher, three Chieftain 2100X and one Warrior 1800 screening plants. Working largely in tandem, the Powerscreen array is producing 10mm, 14mm and 20mm aggregates and 20mm+ oversize from the quarried stone for the civil engineering and construction markets, plus 4mm lime for soil enhancement for agriculture. The initial contract for Willowtree is for two years with potential for extension.

The high capacity Powerscreen Chieftain 2100X and Warrior 1800 screening plants are well-established and site proven machines with output potentials up to 600 and 400 tonnes per hour respectively which, of course, depends on feed size, mesh size and material type. Agile and mobile on site, with heavy-duty crawler tracks and a removable pendant remote control system, both models have quick set-up times, easily accessible engines and screen media for maintenance convenience and screen changes, hydraulically folding conveyors and high-performance hydraulics for optimum output.

The 1000 Maxtrak cone crusher can accept an ‘all in’ feed, eliminating the need for pre-screening which would reduce the cubicity of the finished product.  The feed hopper is equipped with a level probe which maintains choke feeding of the cone crusher, improving cubical shape.

The Premiertrak 400 pre-screen jaw crusher incorporates a fully independent high amplitude, hydraulically driven pre-screen with increased drop angle on the bottom deck to allow maximum throughput and capacity. Improved pre-screened material flow is achieved by an enlarged discharge opening from the under chute which allows faster movement of pre-screened material to bypass the crushing chamber.

James McLeod, Willowtree’s founder and owner, said, “We looked at the available equipment on the market and closely consulted our customer’s highly experienced quarry manager at Coxhoe and we both came to the conclusion the Powerscreen products would be best for the job in hand.”