JERMENSKA GONILA - Arnesvisjasolaravne.splet.arnes.si/files/2018/11/JERMENSKA-GONILA.pdf · Gonila...
Transcript of JERMENSKA GONILA - Arnesvisjasolaravne.splet.arnes.si/files/2018/11/JERMENSKA-GONILA.pdf · Gonila...
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JERMENSKA GONILA
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Prednosti
jermenskih gonil
P= do nekaj 100 kW
η=94 do 97 %
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Slabosti jermenskih gonil
Vrste jermenskih gonil
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Sile na jermenskih gonil
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Vrste ploščatih jermenov
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Spajanje ploščatih
jermenov
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Napenjanje jermenov
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Izvedbe gonil s ploščatim jermenom
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Jermenice za ploščate jermene
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Jermenice srednjih velikosti
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Gonila s klinastimi jermeni
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Klinasti jermeni
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Izvedbe gonil s klinastimi jermeni
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Jermenice za klinaste jermene
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Gonila z zobatimi jermeni
Zobati jermen Synchroflex
Zobati jermen Power Grip HTD
a) enojno in
b) dvojno ozobljeni
P= do 1000 kW
n= do 40000 min-1
η= do 99%
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Izvedba gonil z zobatimi jermeni
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Jermenice za zobate jermene
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Vaja 1
Transportni trak, ki ima premočrtno hitrost vt=2,2m/s poganja asinhronski elektromotor
preko zobniškega predležja R in jermenskega gonila s klinastimi jermeni. Elektromotor
ima moč Pm=3kW in vrtilno frekvenco gredi nm=1420 min-1. Prestavno razmerje
zobniškega gonila je iz=7,23, premer gnanega bobna transportnega traku pa DB=400mm.
Preračunajte in dimenzionirajte jermensko gonilo s klinastimi jermeni in postavite gonilno
jermenico tako, da bosta izpolnjena pogoja a<2(dw1+dw2) in osna višinska razlika med
gonilno in gnano jermenico približno 700mm.
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Vaja 2
Delovno gred ekscenter preše poganja elektromotor preko jermenskega gonila klinastimi
jermeni. Asinhronski elektromotor ima moč 30 kW in vrtilno frekvenco nm=1460 min-1,
gnana jermenica pa n2=510 min-1.
Določite:
a) Prestavno razmerje jermenskega gonila
b) Dimenzije klinastega jermena in velikosti klinastih jermenic
c) Dolžino jermena pri medosni razdalji a0=650 mm
d) Število jermenov
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Korekturni faktor C1 za kot βi≤180°:
Faktor preobremenitve C2 :
Specifična moč Pnj jermena v kW:
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Izbira profila klinastega jermena:
Minimalni srednji premer jermenice:
Jermen a x h 6x4 10x6 13x8 17x11 22x14 25x16 32x19 38x25
dwmin 28 50 71 112 180 250 355 500
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Geometrijske mere žleba za klinaste jermene DIN 2217: