Continuous quantity measurement of free flowing products
Sometimes it is not possible to weigh the bulk with a discontinuous weigher. To avoid an interruption of the process, the bulk has to be weighed continuously. This is possible by using a Vertical Pipe Weigher. A baffle plate transmits the weight to a sensitive load cell. The results are the actual flow rate in t/h and through integration the whole conveyed weight in kg.
The following picture describes the function of a continuous working baffle weigher. The bulk enters through the feedpipe. It is braked by means of a 90° falling brake. Thereby the bulk can be accelerated with a defined velocity. Following the bulk strikes on a baffle pipe. Inside this pipe the striking force and the affection on the pipe bending at the outlet is measured.
Fig. 2: Continuous weighing with the Baffle Pipe Weigher
Simplicity, reliability and accuracy are characteristics of the Baffle Pipe Weigher. A system working with a baffle plate never falls (under realistic circumstances f.e. varying abilities of bulk solid or unsteady amounts of inflow) below 1 - 2 % measurement inaccuracies. In case of ideal conditions (constant quality of bulk solid and steady inflow) more precise results can be achieved. It is not possible to gauge the Vertical Pipe Weigher. Because of that, it is normally used for purpose of internal control.
The Baffle Plate Weigher is based on the baffle-plate principle.