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浮地式糧食水分在線檢測(cè)裝置設(shè)計(jì)與試驗(yàn)
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高等學(xué)校博士學(xué)科點(diǎn)專項(xiàng)科研基金資助項(xiàng)目(20114404110021、20060564003)


Design and Test of Grain Moisture Online Measuring System Based on Floating Ground Capacitance
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    基于非接觸式平行極板浮地電容測(cè)量原理,設(shè)計(jì)了一種適用于惡劣環(huán)境的電容式糧食水分檢測(cè)裝置,結(jié)合靜態(tài)批次測(cè)量法,以提高測(cè)量的重復(fù)精度;設(shè)計(jì)了定位充料器,消除了因堆積方式不同引起空隙率變化對(duì)測(cè)量造成的誤差。采用無線通信技術(shù),實(shí)現(xiàn)傳感器與計(jì)算機(jī)客戶端的實(shí)時(shí)數(shù)據(jù)傳輸,克服了干燥現(xiàn)場(chǎng)惡劣工況對(duì)數(shù)據(jù)信號(hào)傳輸?shù)挠绊?,適用于干燥機(jī)干燥過程中的糧食水分在線實(shí)時(shí)檢測(cè)。在連續(xù)式干燥機(jī)上,在線檢測(cè)玉米的試驗(yàn)結(jié)果顯示,溫度在15~50℃,相對(duì)濕度在80%~100%,玉米含水率范圍在14%~21%動(dòng)態(tài)變化的條件下,在線檢測(cè)結(jié)果與國(guó)標(biāo)規(guī)定的烘箱法測(cè)量相比,最大偏差小于±0.4%。采用定位充料,批次穩(wěn)態(tài)測(cè)量,無線通訊保證了在線檢測(cè)的精度和可靠性,為實(shí)現(xiàn)糧食干燥過程自適應(yīng)控制提供了含水率在線檢測(cè)技術(shù)手段。

    Abstract:

    A new type of capacitive grain moisture on-line measuring device was designed based on the measuring principle of non-contact parallel plate floating capacitor, which was suitable to continuous dryer under severe environment. The static batching measurement was used to improve the repeated accuracy of the measurement. Positioned filling device was designed to eliminate the measuring error caused by the variation of porosity and different way of filling. Wireless communication technology was adopted to achieve real-time data transmission from client sensors to computer and overcome the poor drying conditions, which could affect data transmission. The relationship among moisture, temperature, and capacitance of corn was calibrated and the system was tested on a continuous dryer. The results showed that the correlation coefficient between results of oven method and results of online measuring system was 0.992, and the absolute error of measurement was less than ±0.4%, while the working temperature was 15~50℃, relative humidity was 80%~100%, drying temperature was 70℃, and the corn moisture content range was 14%~21%. It proved that the online measuring system meet the design requirement of poor drying conditions.

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麥智煒,李長(zhǎng)友,徐鳳英,方壯東.浮地式糧食水分在線檢測(cè)裝置設(shè)計(jì)與試驗(yàn)[J].農(nóng)業(yè)機(jī)械學(xué)報(bào),2014,45(10):207-213. Mai Zhiwei, Li Changyou, Xu Fengying, Fang Zhuangdong. Design and Test of Grain Moisture Online Measuring System Based on Floating Ground Capacitance[J]. Transactions of the Chinese Society for Agricultural Machinery,2014,45(10):207-213.

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  • 收稿日期:2014-02-08
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  • 在線發(fā)布日期: 2014-10-10
  • 出版日期: 2014-10-10