Digital display technology from CDE

CDE have recently developed a digital display screen in order to assist a customer in monitoring the ­productivity of their washing plant. With one of the ­largest pit operations in Stockholm, producing sand, ­gravel, ­crushed rock and soil, the Swedish operator Jehander ­ultimately wanted a mechanism to monitor the throughput levels of sand and aggregate being produced to allow them to achieve maximum productivity.

Subsequently, CDE developed a controlled automation system which integrates fully with the operation of the plant itself and is used to set the ‘tonnes per’ rate on sand and aggregate, in turn highlighting the need to increase the feed material if and where necessary. For Jehander, overall production improvements have amounted to approximately 15 %. The controlled automation system allows visibility of production for the operator whilst allowing for raw material planning in terms of management to plan and supply the right mix of raw material to the plant.

This system effectively displays tonnes per hour of ­material to the washing plant as highlighted on the top row of the ­digital display board as shown (Fig.). The actual tonne per hour of sand and aggregate are also set individually on the HMI (Human Machine Interface), indicating that the ­operator ideally should maintain the figure at 100 % in order to fully maximise the washing plant operating ­tonnage. The digital display also features a mechanism that will allow the user to monitor the overall actual tonnage of material that has been fed through the washing plant over a certain time period which can be reset at the end of the day or week. ­Essentially, what this means is that when a plant is running and the sand level is for example at 60 % with the aggregate running at 100 %, this will highlight to the ­operator that finer raw material is required for feeding into the hopper in order to maximise overall plant productivity. The ­hopper will either increase or decrease speed to ­maintain the ­optimum level of 100 % on aggregate and sand.

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