Capacitance type online detection method and device for water of cereals

Abstract

The invention discloses a capacitance type online detection method and a capacitance type online detection device for water of cereals. The method comprises the following steps: grain-shaped cereals are freely scattered and the cereals are stacked in a material collection hopper of a feeding controller; then a motor drives a material discharging idler wheel to rotate at constant speed to uniformly convey the cereals in the material collection hopper to the inner part of a cavity of a cereal capacitive sensor based on a parallel polar plate floating land capacitance principle; after a setting filling amount is achieved, the cereals to be detected are not conveyed to the cavity of the cereal capacitive sensor; then a main controller collects cereal temperature and a capacitance value at the moment under an static state; the water content of the cereals to be detected can be calculated according to a pre-calibrated regression formula; after the measurement is finished, the main controller starts a cereal discharging mechanism to discharge the detected cereals in the cereal capacitive sensor, and the measurement is circulated. According to the capacitance type online detection method and the capacitance type online detection device for the water of the cereals, the influences on stacking porosity by uncertain scattering manners of the cereals are avoided and the measurement stability is improved by a static measurement manner.

Description

technical field [0001] The invention relates to the technical field of capacitive grain moisture online detection, in particular to a capacitive grain moisture online detection method and device. Background technique [0002] The moisture content of grain is an important index to evaluate the quality of grain. Grain moisture detection is of great significance to grain purchase, transportation, storage, and processing trade. Excessive moisture promotes vigorous life activities in grains, easily causing heat generation, mildew, insects and other biochemical changes in grains, and affecting the output of finished grains. However, if the grain moisture is too low, the weight of the grain will be reduced, the quality of the grain will be affected, and the final total selling price of the grain will be reduced. [0003] Existing grain moisture detection methods mainly include oven method, resistance method, capacitance method, near-infrared method, microwave method and so on. Am...

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Problems solved by technology

[0004] At present, capacitive moisture detectors at home and abroad are mainly composed of two brass coaxial electrodes inside and outside. The moisture content of the grain is calculated by detecting the capacitance between the electrodes, the temperature of the grain, and the weight of the grain. Zero calibration, not suitable for online automatic detection

Some researchers use flat panel capacitors to detect the moisture content of wood, but the electric field generated by the flat panel capacitors is an open fringe electric field, which is very easy to be interfered by the external electromagnetic field. There are a large number of large Power equipment (fans, motors, etc.), these high-power equipment will release a lot of electromagnetic interference during work, so flat panel capacitors are not suitable for use in online moisture detection of grain

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