Asosiyqism - Kirish Asosiy qism

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Kirish Asosiy qism
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bet | 2/5 | Sana | 21.05.2024 | Hajmi | 0,65 Mb. | | #248253 |
Bog'liq Qobiljonova2.Asosiyqism
2.1.Elektrodivigatelnitanlashvakinimatikxisob;
Elektrodivigatelni tanlash.
Talab qilingan elektrodivigatel quvvati.
Pum= ;
Bu yerda;P- yetaklanuvchi valning quvvati; P= Ft*V = 3.2*1.6 = 5.2 [kvt]
η –mexanik uzatmaning umumiy F.I.K.
η = η1 η2 η33 η4
Buyerda; η1-silindrsimon tishli uzatmaning F.I.K;η1= 0.98
η2-konussimon tishli uzatmaning F.I.K; η2= 0.98
η3 –bir juft podshipnikni F.I.K; η3= 0.99
η4 – barabanni F.I.K; η4= 0.99
([1] - 55 bet, 1.1 jadvaldan olamiz.)
η = 0.98*0.98*0.993*0.99 = 0.923
Pum = = = 5.5 [kvt]
Barabanni aylanishlar soni va burchakli tezligini aniqlaymiz.
Pb= = = 101.94c-1
Ѡb= = = 10.67c-1
[1]P-1 ilovadan 4A132M8 markali,quvvati 5.5kvt va elektrodivigatelning aylanishlar chastatalari Pdv=750min-1 bo‘lgan assinxron elektrodivigatelni tanlaymiz.
S = 4.1% bo‘lgandaPdv= 719.25min-1 .([1]-390 bet, P1-ilova).
Kinimatik xisob.
Uzatishlar soni.
Uum= U1*U2yokiUum= Pdv/Pb
Uum= =7.05
Uk=2; Us=3.55;
Uum=2*3.55=7.1
Tekshirish; 0.7 < 3%
Vallarnia ylanishlar soni.
P1= Pdv= 719.25min-1.
P2= P1/Uk= 719.25/2 =359.625min-1.
P3= P2/Us = 359.625/3.55 =101.06 min-1.
Vallarni burchakli tezligi.
Ѡ1= Ѡdv= π* Pdv/30=3,14*719.25/30=76.56 c-1.
Ѡ2= Ѡ1/Uk=76.56/2=38.28 c-1.
Ѡ3= Ѡ2/Us= 38.28/3.55=10.78 c-1.
Vallarni burovchi momentlar.
T1= Pum/Ѡ1 = 5.5*103/76.56 = 71.83*103 [*mm].
T2 = T1*Uk = 71.83*103*2 = 146.28*103 [*mm].
T3 = T2* Us= 146.28*103*3.55 = 519.29*103 [*mm].
2.2. Reduktorni konussimon uzatmasining loyixa xisobi.
Reduktor ikkixil tishli uzatmadan iborat bo‘lgani uchun birinchi novbatda konussimon tishliuzatmaning loyixa xisobini bajaramiz.Agar reduktor birxiltishli uzatmalardan iborat bo‘lsa,birinchi novbatda yetaklanuvchi ponadagi tishli uzatmaning loyixa xisobi bajariladi.
Uzatma g’ildiraklarini tayorlash uchun material tanlanib, ularga termik ishlov berish turi belgilanadi.
Shesternya uchun po‘lat 40X, termik ishlovberish turi yaxshilangan, qattilik B 270; ildirakuchun 40X, termikishlovberish turi yaxshilangan, qatilikB 230.
Tishliuzatmalarda shesternya va g’ildiraklarning mustakamligini kantaktkuchlanish bo‘yicha, birxil qilib tayorlash murakkab bo‘lganligi uchun, mustakamlikni chegaralovchi tishli g’ildirak tanlab olinadi.Ishlash muddatini xisobga oluvchi koeffitsent KL=1.0 bo‘lsa, ruxsat etilgan kantaktkuchlanish g’ildirakt uchun tanlanib, mustakamlik shunga asosan tekshiriladi.
[Ϭ]= = = 485 MPa;
= 2B +70 = 2*245+70 = 560 MPa;
[ ] =1.15 – xavfsizlik koyeffiset;
Tashqi konus yetaklovchi g`ildiragining bo‘luvchi diametri.
= Kd =99 =99
=198 mm.DAST 12289-76 dan = 200 mmdebolamiz. ([1] 49-bet).
G’Ildrakning tishlari soni.
Amaliy xisobdaZ1=21÷66 tafsiya etiladi. Shunga asosan Z1=25 deb qabul qilamiz.
Z2 = Z1*Uk= 25*2 = 50; Uk = = = 2;
Uzatma g’ildiraklarining tashq imoduli.
mye = = = 4 mm.
Konusning boshlang’ich bo‘luvchi burchagi.
= U = 2; ctg = = 0.5 .
= arcctg 0.5 = 630 44’.
= 900 - = 900 - 630 44’ = 260 16’.
Konus yasovchisining uzunligi.
Rye= 0.5*mye = 0.5*4 = 2*55.9 = 111.8 mm.
Shestrnya qalinligi.
b2= bRe*Rye = 0.285*111.8 = 31.8 mm.
b2 = 32 mmdebolamiz.
Shestrnyaning bo‘luvchi diametri.
= mye*z1 = 4*25 =100.
= mye*z2 = 4*50 =200.
Shestrnyaning o‘rtach adiametri.
dcp= 2(Rye-0.5b) = 2(111.8-0.5*32)0.49 = 93.88 mm.
Shestrnyaning tish usti diametri.
= + 2*mye* = 100 + 2*4*0.89 = 107.12 mm.
= + 2*mye* = 100 + 2*4*0.49 = 203.92 mm.
Shestrnyaning tish osti diametri.
= - 2.4 *mye = 100 – 2.4*4 = 91.2 mm.
= - 2.4 *mye = 200 – 2.4*4 = 191.2 mm.
mcp= = =3.75 mm.
𝟁bd= = = 0.34.
Shestrnyaning shu nuqtadagi tezligi.
V = = = 3.59 m/c.
Kuchlanish koyeffitsenti.
K = Kβ * Kα * KV;
Buyerda; Kβ = 1.23; Kα = 1.05; KV=1.04;
K = 1.23*1.05*1.04 = 1.34.
([1] 99-bet, 3.4, 3.5 - jadvallar).
Xisobiy kuchlanish.
Ϭ = * = * = =3.496*112.53 = 428.38 MPa⩽ [Ϭ] =485 MPa.
Mustakamli ksharti bajarildi.
ΔϬ = *100 = 9.6 %.
G`ildra kilashishida hosil bo‘lgan kuch.
Ft= = = 1558 .
Ilashishida hosil bo‘lga nradial kuch.
= Ft * * = 1558*0.39*0.89 = 540.78 .
= Ft * * = 1558*0.39*0.49 = 297.73 .
Tishlarni eguvchi kuchlanishga chidamliligi.
Yuklanish koyeffitsenti;
KF = KFβ * KFV = 1.38*1.45 = 2.00.([1] 43 – bet, 3.7, 3.8 - jadvallar).
ϬF = ⩽ [ϬF].
ƟF= 0.85; KF = 2;
= = = 28.09.
= = = 102.04.
= 3.88; = 3.6; ([1] 42-bet).
[ϬF] = ;
Buyerda; = 1.8*B = 1.8*270 =490 MPa.
= 1.8*B = 1.8*245 =440 MPa.
= * = 1.75*1.0 = 1.75.
= =280 MPa; = =250 MPa;
ϬF = = 209.97 = 210 MPa⩽ [ϬF] =250 MPa.
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