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Terex Pegson supply complete package to PMW Minerals

A complete tracked crushing and screening plant has recently been supplied to Yorkshire contractors PMW Minerals Ltd for operation at one of Marshalls’ quarry sites, near Leeds.

Supplied through local dealers BL Pegson Central, the total package comprises a Terex Pegson 1180 Premiertrak together with two Powerscreen Chieftain 1800 screening units.

The machines are being used to crush and screen sandstone dug directly from the quarry face by excavator, with the larger lumps broken by impact hammer before being fed to the crusher, to produce a range of graded-specification products.

The 57-tonne 1180 Premiertrak primary crusher is built around a heavy-duty fabricated chassis and track frame, with power provided by a 300kW, six-cylinder, clean-running Cat C9 diesel power pack. The unit carries the proven Pegson 1,100mm x 800mm M-series single-toggle jaw crusher, which has an unrestricted feed opening, allowing large material to enter the crusher. Both manganese jaws are reversible to extend their operating life, and the inside of the crusher body is fitted with hard-wearing replaceable liner plates. Generous clearance is provided between the crusher discharge and product conveyor.

Material is fed into the crusher via a 9.1m3 capacity hopper, which can be folded down by hydraulic rams to reduce the machine’s height for road transport. The hopper can be fed from the end or either side. A two-step, 4.26m long vibrating bar grizzly feeds material into the crusher mouth, with the bar section allowing dirt in the feed to bypass the crusher via a chute for conveyor discharge to the side of the plant, or on to the fully skirted main conveyor to give an all-in product.

A fully automated PLC management system both protects and ensures optimum running of all individual units on the plant.

Material from the crusher is fed directly into the feed hopper of the first of the two Powerscreen screening units. Designed and built for the high-volume processing of aggregates, both of the tracked Chieftain 1800s feature an angle-adjustable tipping grid, a variable-speed feed conveyor and hydraulically folding side and fines conveyors. The 16ft x 5ft three-deck screen features an oil-filled two-bearing vibrating system and huck-bolted screen meshes.

The screening units are set to give the following product split: +150mm, –150mm +75mm, –75mm +40mm, –40mm +20mm, –20mm +12mm, –12mm +8mm, and –8mm to dust, for use as general fills 6F1 and 6F2, for construction, level raising, drainage, pipe bedding, and for builders’ merchants stocks.

All the individual crushing and screening units are self-powered and can be tracked around the site by remote control.

PMW Minerals, who operate from headquarters in Huddersfield, were founded in 1997 as a sister company to the established P&M Watson haulage firm. Trading primarily in West Yorkshire, the company are involved in site clearance and the supply and delivery of virgin aggregates in the area. They are also involved in on-site contract crushing with local companies as well as operating plant at both of Marshalls’ quarry sites.

Terex Pegson, Mammoth Street, Coalville, Leics LE67 3GN; tel: (01530) 518600; fax: (01530) 518618.


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