Continuous weighers accurately measure line throughput by weight, adding significant value and efficiency to production lines. To promote operational efficiency, flooding and starving of downstream processes are eliminated, and feeding is optimised.
A tea producer approached Rospen with a request to measure their plant’s operational throughput. With a target manufacturing rate of 800-1,700kg/hr, our main challenge was to design a system that was capable of handling tea particles between 0.2-3.2 mm and a bulk density between 210-400 kg/m3.
More importantly, weighing accuracy was of particular importance to the client, who presented us with a target of +/- 1% or better of the plant throughput. In many configurations, it is difficult for continuous weighers to achieve accuracies in excess of +/- 5%. To meet the client’s higher accuracy requirements, a batch flow meter would be required.
To start, we removed an existing but redundant weighing system from the plant, and our engineers designed a new weighing system based on a continuous batching process to fit the space envelope. The new weigh hopper continuously receives tea from a bucket elevator, measures the batch weight and subsequently discharges tea onto an ongoing conveyor.
The PLC-based control system displays the real-time throughput for the plant together, and each batch is logged on a dedicated laptop supplied by Rospen. This supports the shift and campaign master totals and the historical recording process.
ROSPEN’s scope of work included:
Our engineers are masters in their field. Rospen engineers are degree-qualified and equipped with comprehensive knowledge and experience to provide custom solutions to unique client challenges.
Rospen systems are designed to perform with precision accuracy under all operating conditions.
Our systems are built to ensure long term reliability, maximum up-time and lowest on-going operational costs.
No matter the application, from pharmaceutical or food to quarry use, our machines are designed with easy strip-down features for hygienic cleaning.
Design ingenuity enables quick and easy access for maintenance and low downtime.
Standard design features ensure complete flexibility within existing manufacturing.
Unit 7, Waterside Business Park
Haslingden
Rossendale
BB4 5EN
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