A belweigher or belt weigher is a piece of industrial control equipment used to gauge the mass or flow rate of material travelling over a conveyor belt. A control system is a device or set of devices to manage command direct or regulate the behavior of other devices or systems A belt conveyor consists of two or more Pulleys with a continuous loop of material - the conveyor belt - that rotates about them
A beltweigher replaces a short section of the support mechanism of the belt, which might be one or more sets of idler rollers, or a short section of channel or plate. An idler is a mechanical device such as an Idler pulley or Idler wheel that is secondary to the main transfer of power in a mechanical system This weighed support is mounted on load cells. A load cell is an electronic device ( Transducer) that is used to convert a force into an electrical signal The mass measured by the load cells is integrated to compute the mass of material moving on the belt, after allowing for the mass of the belt itself. The European Space Agency 's INTErnational Gamma-Ray Astrophysics Laboratory ( INTEGRAL) is detecting some of the most energetic radiation that comes from space Beltweighers generally include the necessary electronics to perform this calculation, often in the form of a small industrialised microprocessor system. A microprocessor incorporates most or all of the functions of a Central processing unit (CPU on a single Integrated
A beltweigher is normally mounted in a straight section of belt, with no vertical or sideways curvature, and as close to level as is practicable. The weighed support must be aligned vertically and horizontally with the adjacent supports to avoid tensile forces in the belt skewing the measurement.
Outputs from beltweighers are typically:
- pulses at predefined increments of mass
- an analogue signal proportional to the flow rate
In addition, some beltweigher controllers will offer features such as driving an output to stop the belt when a predefined mass of material has been measured. An analog or analogue signal is any continuous signal for which the time varying feature (variable of the signal is a representation of some other
Uses include mineral and aggregate extraction, continuous mixing processes, and control of variable rate feeders. A variable rate feeder is a piece of industrial control equipment used to deliver solid material at a known rate into some process
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