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小麥機械化收獲減損技術(shù)指導(dǎo)意見

2022-06-02 09:54:43 來源:農(nóng)業(yè)農(nóng)村部農(nóng)機化總站 閱讀量:21345 評論

導(dǎo)讀:近日,農(nóng)業(yè)農(nóng)村部農(nóng)業(yè)機械化管理司 農(nóng)業(yè)農(nóng)村部農(nóng)業(yè)機械化總站 農(nóng)業(yè)農(nóng)村部農(nóng)作物生產(chǎn)全程機械化推進專家指導(dǎo)組發(fā)布小麥機械化收獲減損技術(shù)指導(dǎo)意見。

  (2022年5月修訂)
 
  農(nóng)業(yè)農(nóng)村部農(nóng)業(yè)機械化管理司 農(nóng)業(yè)農(nóng)村部農(nóng)業(yè)機械化總站 農(nóng)業(yè)農(nóng)村部農(nóng)作物生產(chǎn)全程機械化推進專家指導(dǎo)組
 
  本技術(shù)指導(dǎo)意見適用于全喂入聯(lián)合收割機的小麥?zhǔn)斋@作業(yè)。在一定區(qū)域內(nèi),小麥品種及種植模式應(yīng)盡量規(guī)范一致,作物及田塊條件適于機械化收獲。機手應(yīng)根據(jù)小麥田間狀態(tài)提前檢查調(diào)試好收獲機,確定適宜收割期,執(zhí)行小麥機收作業(yè)質(zhì)量標(biāo)準(zhǔn)和操作規(guī)程,提高作業(yè)效率、減少收獲環(huán)節(jié)損失。
 
  一、作業(yè)前準(zhǔn)備
 
  開始作業(yè)前要保持機具良好的工作狀態(tài),預(yù)防和減少作業(yè)故障,提高作業(yè)質(zhì)量和效率。
 
  (一)機具檢查
 
  作業(yè)季節(jié)開始前要依據(jù)產(chǎn)品使用說明書對聯(lián)合收割機進行一次全面檢查與保養(yǎng),確保機具在整個收獲期能正常工作。經(jīng)重新安裝、保養(yǎng)或修理后的小麥聯(lián)合收割機要認(rèn)真做好試運轉(zhuǎn),先局部后整體,認(rèn)真檢查行走、轉(zhuǎn)向、制動、燈光、收割、輸送、脫粒、清選、卸糧等機構(gòu)的運轉(zhuǎn)、傳動、操作、間隙等情況,檢查有無異常響聲和三漏情況,發(fā)現(xiàn)問題及時解決。要檢查各操縱裝置功能是否正常;離合器、制動踏板自由行程是否適當(dāng);發(fā)動機機油、冷卻液是否適量;儀表板各指示是否正常;輪胎氣壓是否正常;傳動鏈、張緊輪是否松動或損傷,運動是否靈活可靠;檢查和調(diào)整各傳動皮帶的張緊度,防止作業(yè)時皮帶打滑;重要部位螺栓、螺母有無松動;割臺、機架等部件有無變形等。備足備齊田間作業(yè)常用工具、零配件、易損零配件及油料等,以便出現(xiàn)故障時能夠及時排除。
 
  (二)試割
 
  正式開始作業(yè)前要選擇有代表性的地塊進行試割。試割作業(yè)行進長度以30米左右為宜,根據(jù)作物、田塊的條件確定適合的收割速度,對照作業(yè)質(zhì)量標(biāo)準(zhǔn)(見表1)仔細(xì)檢查損失率、破碎率、含雜率等情況,有無漏割、堵草、跑糧等異常情況,并以此為依據(jù)對割刀間隙、脫粒間隙、篩子開度和(或)風(fēng)扇風(fēng)量等情況進行必要調(diào)整。調(diào)整后再進行試割并檢測,直至達到質(zhì)量標(biāo)準(zhǔn)和農(nóng)戶要求。作物品種、成熟度、干濕程度、田塊條件有變化要重新試割和調(diào)試機具。試割過程中,應(yīng)注意觀察、傾聽機器工作狀況,發(fā)現(xiàn)異常及時解決。
 
  二、確定適宜收獲時間
 
  小麥機收宜在蠟熟末期至完熟初期進行,此時產(chǎn)量最高,品質(zhì)最好。小麥成熟期主要特征:蠟熟中期下部葉片干黃,莖稈有彈性,籽粒轉(zhuǎn)黃色,飽滿而濕潤,籽粒含水率25%—30%。蠟熟末期植株變黃,僅葉鞘莖部略帶綠色,莖稈仍有彈性,籽粒黃色稍硬,內(nèi)含物呈蠟狀,含水率20%—25%。完熟初期葉片枯黃,籽粒變硬,呈品種本色,含水率在20%以下。
 
  確定收獲時間,還要根據(jù)當(dāng)時的天氣情況、品種特性和栽培條件,合理安排收割順序,做到因地制宜、適時搶收,確保顆粒歸倉。大面積收獲可選擇在蠟熟中期開始作業(yè),小面積收獲可選擇在蠟熟末期作業(yè),以使大部分小麥在適收期內(nèi)收獲。留種用的麥田宜在完熟期收獲。如遇雨季迫近,或急需搶種下茬作物,或品種易落粒、折稈、折穗、穗上發(fā)芽等情況,應(yīng)適當(dāng)提前收獲時間。
 
  三、機收作業(yè)質(zhì)量要求和測定方法
 
  (一)作業(yè)質(zhì)量要求
 
  機收作業(yè)質(zhì)量應(yīng)符合NY/T 995-2006《谷物(小麥)聯(lián)合收獲機械 作業(yè)質(zhì)量》標(biāo)準(zhǔn)要求。
 
(二)簡易測定法
 
  推薦“半米幅寬法”和“巴掌法”。選擇自然落粒少的田塊,在收割機穩(wěn)定作業(yè)區(qū)域,往返兩個行程內(nèi)隨機選取兩個取樣區(qū),收集掉落地上的籽粒個數(shù),根據(jù)當(dāng)?shù)氐男←溓ЯV?或落地籽粒稱重)和平均畝產(chǎn)量估算平均損失率。
 
  1.半米幅寬法。取樣區(qū)為沿著收割機前進方向長度為0.5米,寬為聯(lián)合收割機工作幅寬,按照公式(1)計算取樣區(qū)的損失率。
 
(1)
 
  式中:Si—第i個取樣區(qū)損失率,單位為%;Wi—為第i個取樣區(qū)落地籽粒質(zhì)量,單位為克;M—收割機工作幅寬,單位為米;L—小麥畝產(chǎn)量,單位為公斤/畝。
 
  如果沒有稱重條件,可以用往年小麥千粒重估算落地籽粒質(zhì)量。以小麥千粒重45克,畝產(chǎn)量450公斤,工作幅寬為2米的收割機為例,按照標(biāo)準(zhǔn)損失率≤2.0%,“半米幅寬法”一個取樣區(qū)域內(nèi)落地籽粒應(yīng)不超過300粒。不同小麥品種按千粒重和畝產(chǎn)量確定以及收割機工作幅寬落地籽粒判定標(biāo)準(zhǔn)粒數(shù)。
 
  2.巴掌法。用成人的手掌劃定取樣區(qū)域,面積按0.02平米計,按照公式(2)計算取樣區(qū)的損失率。
 
(2)
 
  式中:Ni—第i個取樣區(qū)籽粒數(shù)量,單位為個;G—該地塊往年小麥千粒重,單位為克。
 
  以小麥千粒重45克,畝產(chǎn)量450公斤為例,按照標(biāo)準(zhǔn)損失率≤2.0%,“巴掌法”不超過6粒。不同小麥品種按千粒重和畝產(chǎn)量確定落地籽粒判定標(biāo)準(zhǔn)粒數(shù)。
 
  四、減少機收環(huán)節(jié)損失的措施
 
  作業(yè)過程中,應(yīng)選擇適當(dāng)?shù)淖鳂I(yè)參數(shù),并根據(jù)自然條件和作物條件的不同及時對機具進行調(diào)整,使聯(lián)合收割機保持良好的工作狀態(tài),減少機收損失,提高作業(yè)質(zhì)量。
 
  (一)選擇作業(yè)行走路線
 
  聯(lián)合收割機作業(yè)一般可采取順時針向心回轉(zhuǎn)、逆時針向心回轉(zhuǎn)、梭形收割三種行走方法。在具體作業(yè)時,機手應(yīng)根據(jù)地塊實際情況靈活選用,要卸糧方便、快捷,盡量減少機車空行。作業(yè)時盡量保持直線行駛。轉(zhuǎn)彎時應(yīng)停止收割,將割臺升起,采用倒車法轉(zhuǎn)彎或兜圈法直角轉(zhuǎn)彎,不要邊割邊轉(zhuǎn)彎,以防因分禾器、行走輪或履帶壓倒未割小麥,造成漏割損失。
 
  (二)選擇作業(yè)速度
 
  根據(jù)聯(lián)合收割機自身喂入量、小麥產(chǎn)量、自然高度、干濕程度等因素選擇合理的作業(yè)速度。作業(yè)過程中(包括收割作業(yè)開始前1分鐘、結(jié)束后2分鐘)應(yīng)盡量保持發(fā)動機在額定轉(zhuǎn)速下運轉(zhuǎn)。通常情況下,采用正常作業(yè)速度進行收割,盡量避免急加速或急減速。當(dāng)小麥稠密、植株大、產(chǎn)量高、早晚及雨后作物濕度大時,應(yīng)適當(dāng)降低作業(yè)速度。摘檔停車時,要等小麥脫粒滾筒運轉(zhuǎn)一段時間后,再減小油門熄火停車。
 
  (三)調(diào)整作業(yè)幅寬
 
  在作業(yè)時不能有漏割現(xiàn)象,作業(yè)幅寬以割臺寬度的90%為宜,保證喂入均勻;但當(dāng)小麥產(chǎn)量過高、濕度過大或留茬高度過低時,以最低檔速度作業(yè)仍超載時,應(yīng)減小割幅,一般割幅減少到80%時即可滿足要求。
 
  (四)保持合適的留茬高度
 
  割茬高度應(yīng)根據(jù)小麥植株高度和地塊的平整情況而定,一般以10—15厘米為宜。割茬過高,由于麥穗高度不一致或通過田埂時割臺上下波動,易造成漏割損失;同時,撥禾輪的撥禾鋪放作用減弱,易造成落地?fù)p失。在保證正常收割的情況下,割茬應(yīng)盡量降低但不小于5厘米,以免割刀切入泥土,加速切割器磨損。對于小麥穗頭下部莖稈含水率較高地塊收獲作業(yè)時,可選用雙層割刀割臺,以減少喂入量,降低小麥留茬高度。
 
  (五)調(diào)整撥禾輪速度和位置
 
  調(diào)整撥禾輪的轉(zhuǎn)速,使撥禾輪線速度為聯(lián)合收割機前進速度的1.1—1.2倍,不宜過高;調(diào)整撥禾輪高低位置,應(yīng)使撥禾輪彈齒或壓板作用在被切割作物高度的2/3處為宜;調(diào)整撥禾輪前后位置,應(yīng)視作物密度和倒伏程度而定,當(dāng)作物植株密度大并且倒伏時,適當(dāng)前移,以增強扶禾能力。撥禾輪轉(zhuǎn)速過高、位置偏高或偏前,易造成小麥穗頭籽粒脫落,增加收獲損失。調(diào)整后,從駕駛室觀察,以撥禾輪不翻草、割臺不堆積麥稈為宜。
 
  (六)調(diào)整脫粒、清選等工作部件
 
  脫粒滾筒的轉(zhuǎn)速、脫粒間隙和導(dǎo)流板角度的大小是影響小麥脫凈率、破碎率的重要因素。在保證破碎率不超標(biāo)的前提下,可通過適當(dāng)提高脫粒滾筒的轉(zhuǎn)速,減小滾筒與凹板之間的間隙,正確調(diào)整入口與出口間隙之比(一般為4∶1)等措施,提高脫凈率,減少脫粒損失。在保證含雜率不超標(biāo)的前提下,可通過適當(dāng)減小風(fēng)扇風(fēng)量、調(diào)大篩子的開度及提高尾篩位置等,減少清選損失。
 
  (七)倒伏小麥的收割
 
  做好聯(lián)合收割機撥禾輪、脫粒清選系統(tǒng)的調(diào)整。適當(dāng)降低割茬,以減少漏割。倒伏嚴(yán)重時,應(yīng)采取逆倒伏方向收獲,撥禾彈齒后傾15—30度,撥禾輪適當(dāng)前移,可安裝專用的扶禾器;順倒伏方向收獲時,撥禾彈齒后傾15—30度,以增強扶禾作用??赏ㄟ^降低作業(yè)速度來減少喂入量,防止堵塞。要適當(dāng)增加風(fēng)量,調(diào)好風(fēng)向和篩子的開度,以糠中不裹糧為宜。割臺底板輕觸地面,割刀距地面高度視倒伏情況調(diào)整低于10厘米為宜。
 
  (八)收割過熟作物
 
  小麥過度成熟時,莖稈過干易折斷、麥粒易脫落,脫粒后碎莖稈增加易引起清選困難,收割時應(yīng)適當(dāng)調(diào)低撥禾輪轉(zhuǎn)速,防止撥禾輪板擊打麥穗造成掉粒損失,同時降低作業(yè)速度,適當(dāng)減小清選篩開度,也可安排在早晨或傍晚莖稈韌性較大時收割。
 
  (九)規(guī)范作業(yè)操作
 
  作業(yè)時應(yīng)根據(jù)作物品種、高度、產(chǎn)量、成熟程度及秸稈含水率等情況來選擇作業(yè)擋位,用作業(yè)速度、割茬高度及工作幅寬來調(diào)整喂入量,使機器在額定負(fù)荷下工作,盡量降低夾帶損失,避免發(fā)生堵塞故障。要經(jīng)常檢查凹板篩和清選篩的篩面,防止被泥土或潮濕物堵死造成糧食損失,如有堵塞要及時清理。收割作業(yè)結(jié)束后糧箱存糧,要及時卸凈。
 
  (十)在線監(jiān)測
 
  提升裝備智能化水平,可在小麥聯(lián)合收割機上裝配損失率、含雜率、破碎率在線監(jiān)測裝置。機手根據(jù)在線監(jiān)測裝置提示的相關(guān)指標(biāo)、曲線,適時調(diào)整作業(yè)速度、喂入量、留茬高度等作業(yè)狀態(tài)參數(shù),得到并保持損失率、含雜率、破碎率較理想的作業(yè)狀態(tài)。
 
  五、培訓(xùn)與監(jiān)督
 
  (一)開展收獲技術(shù)培訓(xùn)
 
  機手、種植戶和從事收獲質(zhì)量監(jiān)督的鄉(xiāng)鎮(zhèn)農(nóng)機管理人員應(yīng)經(jīng)過培訓(xùn),掌握小麥品種、籽粒含水率、種植模式、收割地形等方面的知識,掌握聯(lián)合收割機的正確使用、維護保養(yǎng)知識以及作業(yè)質(zhì)量標(biāo)準(zhǔn)要求。
 
  (二)加強作業(yè)質(zhì)量監(jiān)督
 
  鼓勵種植戶與機手簽訂收獲作業(yè)損失協(xié)議,農(nóng)機管理人員可通過巡回檢查監(jiān)督作業(yè)損失等情況,并在損失偏大或出現(xiàn)其他不合乎要求情形時,要求機手對聯(lián)合收割機進行調(diào)整,仍不合要求的,應(yīng)及時更換故障部件或整機。
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