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A method for detecting the state of stored grain

A detection method and state technology, applied in the direction of instruments, control/regulation systems, temperature control, etc., to achieve the effect of efficient ventilation operations

Active Publication Date: 2019-03-22
ANHUI BOWEI CHANGAN ELECTRONICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Only when the temperature of the food heat spreads to the position of the temperature sensor, it can sense the overheating of the food, and the food is a poor conductor of heat, which leads to a certain hysteresis of the temperature measuring cable in detecting the overheating of the food

Method used

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  • A method for detecting the state of stored grain
  • A method for detecting the state of stored grain
  • A method for detecting the state of stored grain

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] In this embodiment, a capacitive moisture sensor is placed in the center of the preset space, and the capacitance of the grain in the preset space is measured by the capacitive moisture sensor, and the abnormal increase, significant increase, and significant increase of the grain moisture measured by the capacitive moisture sensor To characterize the abnormal increase, obvious increase, and significant increase of grain capacitance. In this way, it is easy to read and judge.

[0047] The capacitive moisture sensor is essentially a capacitor, and its electric field lines cover a certain space around the sensor (that is, the preset space). Therefore, the measured grain capacitance in the preset space can also represent the grain dielectric constant in the preset space. see figure 2 , the grain moisture is constant, the grain dielectric constant increases with the increase of grain temperature; the grain temperature is constant, the grain dielectric constant increases w...

Embodiment 2

[0067] Mechanical ventilation to reduce grain temperature

[0068] Such as image 3 As shown, it is point a (moisture value is 14%) before ventilation, and after a period of ventilation, the outside of the grain has cooled but the internal temperature has not completely dropped, and it becomes point c (that is, the internal temperature of the grain is higher than that of the grain). The external temperature and the temperature sensor temperature drop slowly, so the internal dielectric constant decreases slowly. But the moisture measurement value is calculated according to the sensor temperature and internal dielectric constant, so the moisture measurement value will increase and the sensor temperature will decrease; the moisture value is 15.5 %); after the internal temperature of the grain drops, the inside and outside of the grain and the temperature sensor reach thermal equilibrium again, point c will eventually become point d (moisture value is 13.5%), that is, grain moistu...

Embodiment 3

[0071] Conditioner ventilation for added moisture

[0072] Such as Figure 4 As shown, at the beginning of the ventilation, the water is concentrated on the surface and outside of the grain, and the capacitance of the capacitive moisture sensor increases. The resulting capacitance will gradually decrease. In this process, the moisture measurement value will increase obviously from the initial value point a (moisture value 13%) to point e (moisture value 16%), and then gradually decrease and approach the true moisture value after adding water. Value f point (moisture value 14.5%).

[0073] Conclusion: According to this method, it can quickly and intuitively reflect that the moisture value measured by the capacitive moisture sensor increases significantly due to the water on the surface of the grain during the conditioning and ventilation process of the grain, while the internal moisture of the grain changes slowly. When the moisture value measured by the capacitive moisture ...

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Abstract

The invention discloses a method for detecting a grain storage state. The method comprises the following steps: (1) measuring grain capacitance in a preset space; placing a temperature sensor at the center of the preset space and measuring the temperature of the temperature sensor itself through the temperature sensor; and (2) in an initial state, the grain moisture in the preset space is normal, the internal temperature and the external temperature of the grain granules of the grain in the preset space are the same, and the grain and temperature sensor in the preset space reach a heat balance; determining that the grain in the preset space generates a heated phenomenon when the temperature measured by the temperature sensor is not obviously changed but the measured grain capacitance in the preset space is obviously increased compared with the that in the initial state; and determining that the grain in the preset space generates a condensation phenomenon when the temperature measured by the temperature sensor is not obviously changed but the measured grain capacitance in the preset space is remarkably increased compared with the that in the initial state. The method can quickly and accurately analyze and determine whether the internal temperature and the external temperature of the grain granules are consistent, and whether the grain is heated or condensates.

Description

technical field [0001] The invention relates to the field of grain storage, in particular to a method for detecting the state of grain storage. Background technique [0002] my country is a country with a large population and a large food producer, and food security is closely related to the national economy and people's livelihood. my country's large-scale grain storage and long storage time determine the importance of grain storage quality. The state of grain storage is specifically divided into grain temperature, grain moisture, and whether the grain is heated (that is, the characteristics of abnormally high grain temperature and grain deterioration). When the grain moisture exceeds the safe moisture corresponding to the grain temperature, the grain may generate heat. The safe moisture content is different at different temperatures. The general rule is that the higher the grain temperature, the lower the safe moisture content. At present, my country's grain storage ind...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G05D23/20
CPCG05D23/20
Inventor 闫洪亮胡佳李臻马林森田梦赵学亮
Owner ANHUI BOWEI CHANGAN ELECTRONICS
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