Mervyn Govender, Richards Bay branch chairman (left) together with Erick Wessels at the March Technology evening.
The March Technology Evening was held at Umhambi Lodge where the sales engineer for Thermo Fischer Scientific, Erick Wessels, gave a presentation on ‘Conveyor belt scale back to basics’.
Erick kicked off with the principle of operation of a conveyor belt scale, how the feed rate is derived and the recent trends in belt scales in terms of communication capabilities. He explained the importance of all the components of the scale system, which includes the weighbridge, speed sensor as well as integrator. Erick explained the properties and characteristics of each component of the system and how different factors will affect the accuracy and operation of the belt scale.
Belt scale sizing and selection was one aspect that could not go without a mention. The decision to select a single or multi idler, pivot or floating scale, is influenced by the specific application, accuracy, belt scale design, conveyor design and calibration requirements. The conveyor belt positioning is also influenced by such factors as the conveyor incline, the conveyor shape and loading points.
Calibration is an area that many people take for granted, Erick posed a question to audience: “When was the last time you ever calibrated the belt speed?” None of us had ever done this.
There are various calibration methods – resistor, static weight, chain and material calibration, each with its own pros and cons. The most recommended methods are the chain and material bulk test calibration since they both take the loading profile of the belt into account although the chain calibration comes at a cost.
Erick explained the limitations of the belt scale as well as maintenance requirements. He stressed that there has to be a maintenance schedule for the scale. If such a schedule is not in place then it is better not to clean the belt at all and calibrate it with its dirt as that will form part of its dead load. In conclusion, the conveyor structure, conveyor belt, loading practices and maintenance are as important in accurate weighing as the belt scale itself.
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