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Method for determining water content of grain in spreading type grain drier

A grain drying machine and grain moisture technology, applied in special data processing applications, instruments, electrical digital data processing, etc., can solve the problems of poor control of grain drying, and achieve simple structure, convenient manufacture and installation, and low production cost Effect

Inactive Publication Date: 2008-09-17
NANJING AGRICULTURAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, the degree of drying control of the grain is also less

Method used

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  • Method for determining water content of grain in spreading type grain drier
  • Method for determining water content of grain in spreading type grain drier
  • Method for determining water content of grain in spreading type grain drier

Examples

Experimental program
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Effect test

Embodiment 1

[0042] In this embodiment, Xudao No. 3 is selected and placed in the cylindrical silo of the flat-storage grain dryer 1 with a layer thickness of 50 cm. The plate electrode 3 is placed on the insulating bottom plate 2 on the bottom surface. The frequency f of the high-frequency signal E =9000Hz, measured U 1 = 2.47V, U 2 =0.93V, α=169.34°. According to the function relationship (1), (2), the impedance R of Xudao No. 3 is obtained m =243.230kΩ, capacitive reactance C m = 1.34 -11 F, the water content ω=14.47% is obtained by the fitting function (9) or (10).

Embodiment 2

[0044] In this embodiment, Zhoumai 15 is selected and placed in the cylindrical silo of the flat-storage grain dryer 1, with a layer thickness of 45 cm. The plate electrode 3 is placed on the insulating bottom plate 2 on the bottom. The frequency of the high-frequency signal E is f=5000 Hz, Measured U 1 =2.52V, U 2 =0.88V, α=166.46°. According to the functional relationship (1) and (2), the impedance R of Zhoumai 15 is obtained m =265.095kΩ, capacitive reactance C m = 2.89 -11 F, the water content ω = 10.36% is obtained by the fitting function (7) or (8).

Embodiment 3

[0046] In this embodiment, Zhoumai 15 is selected and placed in the cylindrical silo of the flat-storage grain dryer 1 with a layer thickness of 40 cm. The plate electrode 3 is placed on the insulating bottom plate 2 on the bottom surface. The high-frequency signal E frequency f = 9000 Hz , Measured U 1 =2.43V, U 2 = 0.92V, α = 169.47°. According to the functional relationship (1) and (2), the impedance R of Zhoumai 15 is obtained m =241.789kΩ, capacitive reactance C m = 1.36 -11 F, the water content ω = 10.36% is obtained from the fitting function (11) or (12).

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Abstract

The related moisture detection method for dried grain comprises: putting paralleled two plate electrodes on drier sides or bottom with some distance, forcing a high-frequency signal E connected to a standard resistance RH on the electrodes to generate a non-even electric field; detecting the voltage drop U1 of grain and U2 of RH and their phase difference alpha, and obtaining the Rm or Cm and then the moisture omega by electric formula and fitting function. This invention is simple and low cost.

Description

Technical field [0001] The invention relates to a grain dryer, in particular to a grain moisture detection method for a flat-silo type grain dryer. Background technique [0002] Existing grain dryers generally use two parallel plate electrodes as sensors to measure the moisture content of grains placed in them, and use the correlation between the electrical characteristics of grains in a uniform electric field and grain moisture to measure grains. Moisture. This moisture detection method is mainly used in fluidized bed and tower type grain dryers, but cannot be used in flat bin type grain dryers. Because the flat-silo type grain dryer adopts the counter-current drying method for grain drying, the grain is fed from the upper part of the drying silo, and there is a sweeping auger at the bottom of the cylindrical grain silo, which surrounds its own auger shaft. Rotation, one side revolves around the axis OO driven by the rotation. Hot air is continuously blown into the granary from ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N27/02G06F19/00
Inventor 董怡为丁为民
Owner NANJING AGRICULTURAL UNIVERSITY
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