1. Combine Cereale Paioase
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MASINI SI ECHIPAMENTE PENTRU RECOLTAREA CULTURILOR AGRICOLE
COMBINE PENTRU RECOLTAT CEREALE PAIOASE
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Scopul recoltarii mecanizate:
recuperarea semintelor
(fara alte reziduuri) acompaniata de:
a. pierderi minime de seminte
b. deteriorari externe minime ale semintelor
c. vatamari interne minime ale semintelor, daca vor fi utilizate pentru semanat
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Operatiile efectuate de combinele de recoltat cereale
Principale
• taierea culturii, sau ridicarea din brazda• treierarea materialului vegetal, pentru desprinderea semintelor de pe partile de sustinere ale plantei• separarea semintelor si ale altor componente de masa de paie• curatarea semintelor de impuritati si alte resturi vegetale• depozitarea temporara a materialului recoltat (seminte)
Secundare
• deplasarea pe cimp la si de la punctul de lucru• transport intern de material recoltat catre echipamentele de batere si spre alte parti componante ale combinei
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adunare taiere transport batereseparare
secundara
curatare
descarcare depozitare transport
material vegetal
heder
aparat treier
buncar
scuturatori
sistem site
paie lungi
paie scurte pleava
seminte curatate
SCHEMA BLOC FUNCTIONALA A UNEI COMBINE
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TIPURI DE COMBINE
Tip conventional de combina pentru recoltarea cerealelor paioase
•alimentarea tangentiala cu material a aparatului de treier•separarea – prin lovire si frecare intre batator si contrabatator•separarea suplimentara – prin intermediul scuturatorilor
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Tip Western Roto Tresh - fabricata doar citiva ani
•separarea primara – prin batator – contrabatator•separarea secundara – prin intermediul unei tobe de diametru mare (viteza mica de rotatie), perforata
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Tip International Harvester
•rotor unic de batere si separare (doua sectiuni de operare)•batator final pentru aruncarea paielor (nu pentru separarea finala)•sub diverse variante constructive (inclusiv model tractat) – in fabricatie
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Tip Sperry New Holland
•separarea - rotoare axiale duble (cu miscare in contrasens)•suprafata de separare – doua tipuri de contabatatoare•un batator final – pentru definitivarea extragerii semintelor din paiele lungi•sub diverse variante constructive – model in fabricatie
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Tip White
•rotor unic, orizontal de batere si separare (cu trei sectiuni de operare)•dispozitiv de alimentare prin aruncare - la intrarea in aparatul de treier
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Tip Allis Chalmers
•rotor – montat transversal, cu contrabatator cu doua sectiuni de operare (ca un aparat axial dar intors la 90°)• dispozitiv de aruncare al paielor lungi
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schemă clasică pentru combina de recoltat cereale paioase
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circuitele de material într-o combină clasică
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PARTI COMPONENTE - HEDER
A. APARATUL DE TAIERE
caractersiticile aparatelor de tăiere prin forfecare
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constructia
aparatelor de tăiere prin forfecare
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caracteristicile taierii prin forfecare
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aparat de tăiere prin forfecare, clasic, cu taiere normala
variante constructive:S = t = t0 = 76.2 mm (3 inch) – aparat cu cursă simplă
S = 2t = 2t0 = 152.4 mm (6 inch) – aparat cu cursă dublă
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aparat de tăiere prin forfecare, cu tăiere mediet = k t0 ; 1 < k < 2
variante constructive:S = t = kt0 = 76.2 mm (aparat cu cursă simplă)
S = 2t = 2kt0 = 152.4 mm (aparat cu cursă dublă)
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aparat de tăiere prin forfecare, cu tăiere joasă
t = 2t0
S = t = 2 t0 = 76.2 mm
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diagrama de tăiere a aparatului prin forfecare,
cu taiere normala
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MECANISME DE ACTIONARE
ALE APARATULUI DE TAIERE
a- mecanism bielă-manivelă dezaxat; b- mecanism b-m cu furcă cardanică; c- mecanism cu şaibă oscilantă; d,e,f- mecanisme cu culisă oscilantă; g- mecanism b-m cu balansier
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B. RABATORUL
teoria rabatorului
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forma traiectoriei paletelor rabatorului
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reglarea înălţimii rabatorului faţă de talia culturii şi influenţa raportului λ asupra traiectoriei unui punct
de pe rabator
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dotarea rabatorului cu degete ridicătoare de plante
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C. TRANSPORTORUL ADUNATOR
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VARIANTA DE RECOLTARE DIRECTA – PRIN PIEPTANARE
cap de recoltare cu transportor melc intermediar
cap de recoltare cu transportor inclinat intermediar
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dispozitiv de recoltare tip pieptene
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PARTI COMPONENTE - BATOZA
A. APARATUL DE TREIER
SCHEMA BLOC FUNCTIONALA A APARATULUI DE TREIER
aparat treier(batere)
material vegetal taiat
(vrac)
•paie lungi
•spice netreierate
•seminte (boabe)
•paie scurte
•fragmente spice netreierate
•impuritati
min. 95%-96% separare seminte
(min. 98% separare – standarde ASABE)
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TIPURI DE ALIMENTARI
tip 1 - alimentare tangentiala – pentru aparate clasice transversale
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tip 2 - alimentare axiala – pentru aparate clasice axiale
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tip 3 - alimentare tangentiala, operare axiala, evacuare tangentiala – pentru unele aparate
axiale
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SCHEMA GENERALA DE PRINCIPIU
schema generală de principiu al unui aparat de treier transversal
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modele clasice de aparate de treier
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modele de aparate transversale clasice
APARATE DE TREIER TRANSVERSALE - TANGENTIALE
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principiul de lucru al aparatului transversal clasic
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influenţa lungimii contrabătătorului asupra separării seminţelor
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aparat de treier transversal cu cuie (pentru seminţe cu rezistenţă mare la separare – orez)
modele de cuie şi procesul de lucru al aparatului de treier cu cuie
Varianta de aparat de treier transversalpentru seminte tari, cu desprindere grea
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Performantele aparatelor de treier
Se masoara prin:
1. Eficienta baterii - % de material batut, raportat la cantitatea de material care intra in aparatul de treier (daca ramin sau nu ramin spice sau fragmente de spice netreierate, care scapa din aparatul de treier)
2. Eficienta separarii - % de seminte separate prin contrabatator
3. Seminte sparte - % de seminte sparte, seminte cu suprafata deteriorata sau cu defecte interne datorate baterii
4. Cantitatea de paie frinte, batute, strivite
Performantele aparatelor de treier depind de:
1. Factori de proiectare
• Diametru batator
• Lungime contrabatator
• Numar de bare (sine de batere)
2. Factori de operare
• Viteza batatorului
• Distanta batator - contrabatator
3. Starea culturii
• Umiditate
• Maturitate (starea de coacere)
• Tipul culturii
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variatia indicilor calitativi ai aparatelor de treier
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VARIANTE DE APARATE DE TREIER COMBINATEpentru imbunatatirea baterii si separarii
varianta cu rotoare de separare suplimentare
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varianta cu separator rotativ suplimentar si trei segmente de contrabatator
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VARIANTE DE APARATE DE TREIER COMBINATEpentru imbunatatirea baterii
a. John Deere – model Tb. New Holland – model CSX
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VARIANTE DE APARATE DE TREIER COMBINATEpentru imbunatatirea baterii
varianta cu separator rotativ anterior suplimentar (system APS – CLAAS)
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varianta cu separator rotativ anterior suplimentar si reglare (comanda) dublu hidraulica(system APS 2 – CLAAS)
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APARATE DE TREIER AXIALE
schema generala de principiu a unui aparat de treier axial
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elementele aparatului de treier axial
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model clasic de batator axial
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schema de combina cu aparat de treier axial
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principiul de lucru - separarea pe rotoarele axiale – la minim trei rotatii complete
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model modern de rotor (batator) axial cu segmente de batere (CASE)
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B. SISTEMUL DE SCUTURARE AL PAIELOR
scuturatori
material vegetal
trecut prin aparatul de treier
dispozitive impingere
material(postbatator)
•seminte (boabe)
•paie (fragmente) scurte
•paie lungi
•impuritati
teren agricol
sistem uniformizare curgere
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sistem clasic cu scuturători tip “cai”
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variante cu intensificarea agitaţiei paielor
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scuturători rotativi montaţi în tren de scuturare
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variantă cu separatoare rotative multiple
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variantă cu separatoare rotative – varianta JD – Hanovra 2007
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variantă cu scuturător rotativ axial
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TENDINTE 2014 PIATA AMERICANA - APARATE DE TREIER
CLAAS Lexion 11
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MASSEY FERGUSON Challenger
22
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CASE IH Axial Flow33
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JOHN DEERE STS
44
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NEW HOLLAND TR
55
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GLEANER66
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VERSATILE RCR 360(cel mai nou venit pe piata combinelor 2012)
contrabatatorul se invirte cu 6-8 rot/min in contrasensul batatorului77
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C. SISTEMUL DE CURATARE DE IMPURITATI
sistem curatare impuritati(bloc site)
material vegetal treierat
(prin contrabatator)
•boabe de la scuturatori
(mai rar spice sau fragmente netreierate)
ventilator
sistem uniformizare curgere
•seminte (boabe)•paie scurte
•fragmente spice netreierate•impuritati
seminte curatate
•pleava
•paie scurte
•impuritati
spre buncar
teren agricol
spice netreierate
spre aparat treier
•separa semintele (boabe) din masa vrac de la aparat treier•se accepta <5% impuritati in masa de seminte •compus din : site cernere material + ventilator
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sistem clasic de curatare de impuritati
1. SITE (blocul de site)
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sistem modern cu precuratare de impuritati
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model clasic de sita Petersen-Closz cu jaluzele
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sistem modern cu precuratare de impuritati – John Deere 2005
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sistem modern cu precuratare de impuritati Opticlean– New Holland 2007
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sistem de curatare triplu - Case
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2. VENTILATOARE
CLASIFICARE
1. Dupa metoda de circulatie a aerului
• aspiratoare (mai rar intilnite)
• refulatoare (majoritatea)
2. Dupa tipul constructiv
• centrifugale (aspiratie axiala – refulare radiala)
• axiale (aspiratie- refulare axiale)
• transversale (aspiratie- refulare transversale)
3. Dupa presiunea de lucru
• de joasa presiune (< 1000 Pa)
• de medie presiune (1000 Pa – 3000 Pa)
• de inalta presiune (>3000 Pa)
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aparate de tocare si imprastiere a materialului secundar
D. SISTEMUL DE TOCARE SI IMPRASTIERE AL PAIELOR
![Page 75: 1. Combine Cereale Paioase](https://reader033.fdocument.pub/reader033/viewer/2022061410/5695d1621a28ab9b0296507e/html5/thumbnails/75.jpg)
aparate de tocare si imprastiere a materialului secundar pe combine cu flux axial
![Page 76: 1. Combine Cereale Paioase](https://reader033.fdocument.pub/reader033/viewer/2022061410/5695d1621a28ab9b0296507e/html5/thumbnails/76.jpg)
cutit pentru tocat material