Discovery Foods are a rapidly growing food producer based in Daventry. Specialising in mexican foods such as torilla wraps, flour forms a large part of thier ingredients making the control of its use extremely important.
The system consisted of a 40 tonne bulk storage silo filled by a road tanker. The outlet of the silo is fitted with a bin activator that feeds a surge hopper. The outlet of the surge hopper is fitted with an inverter controlled rotary blowing seal that will entrain product into the conveying line at a metered rate. A single conveying line will run from the silo and feed product through an inline centrifugal sifter at ground level. The conveying line rises vertically & runs horizontally towards the receiving vessel. The conveying air for the pneumatic transfer system is provided by an exhauster. Preset batch weights of flour are metered into a mobile bowl by a rotary valve. The weight of the batch is controlled using load cells mounted on the weigh vessel on a “Loss in weight basis” The receiving vessel is automatically refilled from the silo when the weight falls to an operator adjustable set point.
The system is controlled from a central Allen Bradley PLC mounted in the main MCC panel. The silo has a separate control panel indicating the silo weight, Alarm indicators etc. The receiving vessel has an HMI mounted in a panel at the bottom of the receiving vessel. This is the main operator control for the system. Main features of the HMI:
Telemecanique Inverter drives were used to control the rotary blowing seal motor on the silo & the rotary valve on the receiving vessel outlet.
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