Effective feed control for a crusher


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Category: Real application examples

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Effective feed control for a crusher

 

 

Process data

Application
Crusher feed control
Container
Feed hopper
Material
Primary crushed stone 250mm to dust
Height
Over 8m

Application

In a quarry, the feed hopper above the secondary crusher is at the heart of the screening and grading process and this is a critical control point. This is where the majority of aggregate comes through, it is a very noisy and dusty environment, with unpredictable flow patterns and material behaviour. The crusher itself is capable of processing up to 400 tons an hour and the whole plant 4000 tons a day. With this level of throughput, its vitally important to get accurate information and control to optimise productivity, energy consumption and product quality from the crusher. Originally, as is the case with most sites in the sector, non-contact ultrasonic level sensors were installed. However, the noise, dust and product build up regularly delivered unreliable performance for the control they required. Instead of an analogue indication of the level in the feed, it was more a series of step changes from low to high and back again, as the reflected echo signals came and went, or they would ‘fail safe high’ through loss of echo. This single measurement problem resulted in regular production halts, poor process and energy management and resets of the sensors to clear the problem. The ultrasonic units required regular maintenance: from cleaning transducers, adjusting angles and ‘tweaking’ software to try and make them perform as they wanted. A solution was needed to improve the performance.



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Effective feed control for a crusher


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