Jaw crusher boosts earthworks operations

Brian Turner was expanding his quarry operations and in the market for a new jaw crusher. He narrowed his list to two machines and sent SEE Civil?s quarry manager, Alan Lippiatt, to inspect them. Alan did not have much information on McCloskey crushers before visiting MSC.

He had been working with SEE for over a year but prior to that was for 10 years the service manager for Screenmasters Australia, the national distributor for Metso Minerals? crushers and screens. Alan had solid experience with the quality of Metso equipment and was impressed with the C50. 

It also helped that Alan became aware that Stephen Whyte, a former Metso Minerals design engineer, highly respected in the industry, was now working for McCloskey and headed the engineering team which had been given the task of designing McCloskey?s new range of mobile crushers.

After consideration, the decision was made to purchase the C50, and it was delivered to the South Ballina quarry where SEE was producing materials for projects in the area, including the Ballina Bypass Alliance.

MSC arranged for Brendon Hague, McCloskey?s international service manager from Ireland, to spend a week with the SEE staff for on-site training. The operator in charge, Pat Schalk, said that running the new crusher was easy. ?From my perspective, it?s the ease of operation that the C50 offers that sets it apart from other jaw crushers. The digital display is one of the machine?s greatest features and the fully automated controls make adjustments very quick and easy,? he commented.

From day one, the C50 set itself apart from other units. Crushing blasted basalt, the C50 was the primary crusher feeding into a secondary impact crusher, followed by two screens, a Fintec 570, and finally a Terex Finlay Supertrak 694.

Initially, the C50 was producing 350 tonnes of material per hour, but had to be scaled back to 300 tph because the secondary impact crusher could not keep pace with the C50?s material output. Pat Schalk added, ?This machine is more powerful than others I have operated over the years; it works at a cracking pace, and only uses 22 litres of fuel an hour.?

The C50 offers a 10 mm Hardox plate hydraulic folding hopper that measures at 10.2 m2. This is mounted over a vibrating feeder with pre-screen. The load sensing jaw can regulate the feeder rate manually or automatically.

The Telsmith jaw is a 50 inch by 26 inch (1270 mm x 660 mm) size with forward and reverse hydrostatic drive, and push-button hydraulic adjustment which allows frequent, fast movement, compared with lengthy shim alterations on competitors? crushers. The fixed and swing plates of the jaw are identical so they are reversible and interchangeable.

At the centre of the Telsmith jaw is its unique hydraulic toggle system, featuring a heavy duty hydraulic cylinder custom-engineered for crushing applications. The unit?s innovative hydraulic adjustment, relief, and clearing systems eliminate costly downtime and prevent component damage.

The relief system will open the crusher when crushing pressure reaches a pre-set level, allowing non-crushable material to pass through easily. After the release of the rejected material, the system automatically returns the crusher to its previous closed side setting for continued operation.

In addition, the C50 can operate from a cold start with material still inside the crushing chamber – a very pleasing feature for those operators who have had to manually dig out material after a blockage and shutdown.

An optical sensor monitors and regulates material flow to the crusher, optimising the work load and minimising powering up and down of the machine under varying work conditions, ensuring the C50 is running at itspeak performance. The C50 is powered by a216kW (350 HP) Tier lll CAT C9 engine andoffers quality branded components throughout.As can be expected these days, service points are easily accessible for maintenance.

An extended 42 inch main conveyor is standard, allowing larger stockpile capacities, and the discharge height is superior to any other crusher in its class at 4210 mm. 

Source: Mobile Screening & Crushing

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