Method and device for determining the delivered volume of a...

G - Physics – 01 – F

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G01F 22/00 (2006.01) G01F 9/00 (2006.01) G01F 13/00 (2006.01) G01G 19/40 (2006.01) G01N 9/02 (2006.01)

Patent

CA 2218652

A method and device for determining the delivered volume of a lot of bulk material, comprising collecting at least one sample from the lot, screening the sample, filling a measuring container with the screened sample, weighing the sample, determining the bulk density of the sample by dividing the measured weight of the sample by the volume of the measuring container, and dividing the weight of the lot by the bulk density to obtain the volume of the lot. The invention includes a device for performing the method comprising a mechanically-operated screening plant comprising a rolling screen. The screening plant screens several different grain fractions in one screening passage. A fine grain fraction is screened out first and each screened grain fraction is subsequently coarser than the preceding screened fraction. Each subsequent grain fraction is screened together with the overrun of the fraction collected in the preceding passage. Thus, the composition of the screened sample is representative of the lot.

L'invention porte sur une méthode et un dispositif permettant de déterminer le volume de livraison d'un lot de produits en vrac. Il s'agit de respecter les étapes suivantes : prélever au moins un échantillon du lot, cribler l'échantillon, remplir un contenant gradué avec l'échantillon criblé, peser l'échantillon, en déterminer la masse volumique apparente en divisant son poids mesuré par le volume du contenant gradué, et diviser le poids du lot par la masse volumique apparente pour obtenir le volume du lot. L'invention comprend un dispositif d'exécution de la méthode qui comporte une installation de criblage mécanique avec cribleur mobile. L'installation crible plusieurs fractions de grain différentes au cours d'un premier criblage. Premièrement, une fraction de grain fine est éliminée du criblage, puis chaque fraction de grain criblée par la suite est plus grosse que la précédente. Chaque fraction de grain subséquente est criblée avec l'excédent de la fraction recueillie au cours du criblage précédent. La composition de l'échantillon criblé constitue donc une bonne représentation du lot.

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