Method and device for measuring grain density

Abstract

The invention discloses a method for measuring the grain density, comprising the following steps of: measuring the capacitance Cb of a capacitance sensor inserted into a grain pile to be measured; calculating the relative dielectric constant epsilon'r2 of the grain pile to be measured; calculating the density value rho1 of the grain sample; measuring the capacitance Ca corresponding to the density value rho1; calculating the relative dielectric constant epsilon'r1 of the grain sample; and establishing the functional relation, i.e., epsilon'r2=((epsilon'r1)1 / 3-1)rho2 / rho1+1)3 between the graindensity and the relative dielectric constant on the basis of the relative dielectric constant epsilon'r1 of the grain pile to be measured, the density value rho1 of the grain sample and the relative dielectric constant epsilon'r1 to determine the average density rho2 of the grain pile to be measured. The invention also provides a device for measuring the grain density. The method and device for measuring the grain density can improve the accuracy for measuring the grain density.

Description

technical field [0001] The invention relates to the field of measurement, in particular to a grain density measurement method and device. Background technique [0002] There is no practical and effective method for accurately measuring the grain density in the grain pile stored in the granary. The following describes a grain density measurement procedure, including scooping up a tea tank with cold water → weighing the tea tank and the weight of the full tank of water (for example, 1.4 kg) with a rod scale → pouring out the water in the tea tank and drying it Tea vat→Use a pole scale to weigh the weight of the tea vat (for example, 0.2 kg)→Fill a flat pan with the grain you want to measure (such as corn)→Use a pole scale to weigh the weight of the tea vat and the full vat of corn (For example 1.07 kilograms)→Calculation: Because the volume of 1.2 kilograms of water is 1.2 cubic decimeters, the density of corn is=(1.07-0.2) kilograms / 1.2 cubic decimeters=0.725 kilograms / cubic...

AI Technical Summary

Problems solved by technology

This method can only test grains in a small volume range (such as tea tanks), but it is difficult to apply to larger grain piles (the reason is that grains are granular materials, and their average density is affected by factors such as stacking gaps. Large-scale grains The pile is affected by its own gravity and external vibration, and its average density will be greater than the density obtained by sampling measurement)

In addition, the accuracy of this measurement method is not high

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