自動(dòng)�(shù)粒儀�(chǎn)品介紹:
�(shù)粒儀可對(duì)主要糧食作物,如�、麥、高粱玉米等顆粒�(jìn)行自�(dòng)�(jì)�(shù),在�(nóng)科院(所)農(nóng)�(yè)大專院校、種子系�(tǒng),糧食中、考察種子指標(biāo),測(cè)量千粒重有應(yīng)��
自動(dòng)�(shù)粒儀工作原理�
電磁振動(dòng)盒使種子逐粒排隊(duì)送料,落入光電轉(zhuǎn)換槽后形成光電脈�(dòng),經(jīng)放大整形倒相后送入�(jì)�(shù)電路,以LED�(shù)碼管顯示讀�(shù)。預(yù)置用拔盤�(kāi)�(guān),當(dāng)�(jì)�(shù)到預(yù)置數(shù)�,停止送料,停止記�(shù)��(shù)粒儀�(shè)有自校頻�,便于檢查計(jì)�(shù)電路及預(yù)置的正確性:
1.電磁振動(dòng)送料裝置:種子放在料盤上,料槽成螺旋��
2.在螺旋槽上升的種子,到達(dá)落料口落�,通過(guò)光電�(zhuǎn)換區(qū)投影到硅光電池上�(chǎn)生電流變化,�(jīng)脈動(dòng)放大整形后得到光電計(jì)�(shù)脈動(dòng),送入�(jì)�(shù)電路�(jì)�(shù)顯示�
3.�(jì)�(shù)顯示電路采用CC4518(菲利蒲公司HEF4518)雙BCD加計(jì)�(shù)器,并以CC4511�“HEF4511)BCD-7段鎖�/譯碼/�(qū)�(dòng)�,譯碼后�(qū)�(dòng)共負(fù)LED�(fā)光數(shù)碼管顯示,四位數(shù)的LED輸入端串入限流電阻,使筆劃亮度均�。CC4518�(jì)�(shù)輸入端有�(shí)鐘端(CL�,時(shí)鐘允許端(EN)和�(fù)位端“R”,�(gè)位數(shù)�(shí)EN=“1”(高壓平)計(jì)�(shù)脈動(dòng)�“CL”輸入,正跳變觸發(fā),后面三位均是CL=“0”(低電平)由EN輸入,負(fù)跳變觸發(fā)�
4.�(yù)置自停電路的控制信號(hào)由開(kāi)�(guān)二管,指輪拔盤開(kāi)�(guān)與四輸入端的與非門�(lián)�,當(dāng)拔盤�(yù)置數(shù)與計(jì)�(shù)�(shù)字相符時(shí),繼電器吸合,從而切斷計(jì)�(shù)輸入,使�(jì)�(shù)輸入端接�,停止送料,LED顯示出預(yù)置數(shù)��
自動(dòng)�(shù)粒儀�(guī)格參�(shù)�
�(jì)�(shù)品種�
�(cè)大小顆粒�
尺寸�(zhǎng)×寬小�12×4mm(小顆粒);
尺寸�(zhǎng)×寬小�12×10mm(大顆粒�
�(cè)小顆粒:
尺寸�(zhǎng)×寬小�12×4mm(小顆粒�
�(jì)�(shù)精度�±4/1000以速度而定。(�(biāo)�(zhǔn)偏差�
�(jì)�(shù)速度:小顆粒大于1000�/3分鐘;大顆粒500�/3分鐘
�(jì)�(shù)容量�1~9999由四位LED�(shù)碼管直接讀�(shù)�
自校頻率:f=1~2HZ f=10~20HZ.
�(yù)置自停:1~9999�(dāng)中數(shù)�,置0000不計(jì)�(shù)�
外接電源�220~±20V~50HZ功率小于20瓦,接地�
儀器尺寸:304×234×180mm
工作壓力�750±30mmHg
�(huán)境溫�0℃~40�
相對(duì)濕度�20℃時(shí)小于80%
連續(xù)使用:大于四小時(shí)�
儀器功能:電路自校,計(jì)�(shù),預(yù)置自�,抽門與送料自鎖� |