Abstract
Continual material feeding represents a process of great importance for process industries. Feeding with belt feeders represents one of the most common methods. Belt feeders are devices that require little space, they are not expensive and, most importantly, they do not interrupt material flow while feeding. Calibration of belt feeders, as well as other measuring devices, is a prerequisite for measuring and achieving a defined level of measurement accuracy. On the other hand, the defined level of measurement accuracy is often difficult to achieve in practice due to the multitude of factors that affect the operation of belt feeders. Existing mathematical models indicate a number of influential factors on measurement accuracy. The paper presents the measurement procedure performed on a belt feeder in laboratory conditions, with variable speeds and belt tensions and the known raised position of the measuring idler. Based on the obtained results, appropriate conclusions were made about the influences on calibration and measurement accuracy
Highlights
Given the technological importance and complexity of measuring material flow, accelerated industrial development imposes the need for increase the level of accuracy of existing measuring devices
In order to examine the influence of certain factors listed in the previous section, tests were performed on a horizontal belt feeder with a flat belt with lateral sides, which is located in the laboratory at the Faculty of Technical Sciences in Novi Sad (Figure 1)
The measuring idler is raised in relation to the adjacent ones by 0.7 mm and this was taken into account when calculating the measurement error according to the existing mathematical model;
Summary
Given the technological importance and complexity of measuring material flow, accelerated industrial development imposes the need for increase the level of accuracy of existing measuring devices. Material flow measurement occurs in many industries. Transport of certain material amount in a specified time interval between loading and unloading points is the transport task of belt conveyors [15]. During transport, the quantity, i.e., the flow of transported material can be measured. The weight of the material on the belt is transferred to the load cell - directly or via a lever system. The principle is based on the specific load with which the material and the belt act on the measuring bridge of the scale, so that the flow is calculated according to: Eksploatacja i Niezawodnosc – Maintenance and Reliability Vol 23, No 3, 2021 where: mwm
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