Cement & Concrete
loading point, the driver leaves the vehicle and proceeds to the self-loading driver console where the driver is prompted to present the RFID card with GeneSYS3 confirming that the vehicle is at the designated loading point correctly positioned on the weighbridge. After recording the tare weight of the vehicle, GeneSYS3 interrogates the vehicle file to verify the actual tare weight comparing it with the tare weight of the vehicle kept on the file, ensuring there is no existing product in the vehicle. On the commencement of loading there is a real-time interaction between GeneSYS3 and the plant PLC control. This interface ensures safety interlocks are observed and provides clear instructions to the driver. The system also uses two-stage loading to ensure vehicles are not overloaded.
If the vehicle has been directed to the BT loading station a similar process is initiated;
Once loading starts there is again real-time interaction between GeneSYS3 and the plant PLC control which ensures safety interlocks are observed. However at this station the driver is asked to slowly drive forward as his target weight increases, as displayed on by the remote display.
The driver console prompts the driver to re-present the RFID badge and once the gross vehicle weight is recorded the driver proceeds to the exit driver console and presents the RFID card where it is retained and the despatch documentation is produced. The traffic barriers then open and the vehicle leaves the site.
As part of the installation Precia-Molen also supplied 4 FX belt weighers which help RockTron monitor the effectiveness of the production process through communication with the plant PLC via a ProfiBus DP network.
Key benefits:
The inclusion of the BT weighing infrastructure within the system has provided key benefits for RockTron as the BT loading station represents a substantial saving on civils costs, eliminating the preparation of a weighbridge foundation in excess of 24 metres in length.
The BT weighing infrastructure comprises a fully weighed conveyor and is connected to the chassis by two articulations placed along the feed centre line, supported at the opposite end by one or two strain gauge cells.
These instruments are for trade use Class 1 and perform the same functions as a weighbridge or a hopper scale and are ideal for installing in confined spaces as the total length is only 4500mm in length with a height of 400mm.
Conclusion
Precia-Molen has installed an innovative system which has surpassed all of RockTron's key objectives. The system operates 24 hours a day assisting RockTron's long-term goal of increasing capacity by encouraging the movement of product at night. GeneSYS3 is one of the most advanced loading and despatch systems which are capable of handling increased production levels whilst maintaining low staffing levels. The system is flexible and will expand to match RockTron's requirements as it looks to grow over the coming years.
John Bance, director of operations, commented: “The Precia- Molen loading and weighing system has proved itself in operation at our Fiddler’s Ferry plant. Close collaboration between Precia- Molen and RockTron has enabled us to deploy a fully automated loading system which meets the needs of our customers and hauliers while providing the detailed load management information we require to run our business efficiently.” For more information contact Precia-Molen on tel: 01527 590320 or visit:
www.preciamolen.com
16 Solids & Bulk Handling • August 2010
www.solidsandbulk.co.uk
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