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MAVZU: Bir pog’anali silndirsimon reduktor.

Guruh: 89-20

Bajardi:
Qabul qildi:
Toshkent-2022


Bir pog’anali silndirsimon reduktor.


1- elektrodvigatel; 2- yassi tasmali uzatma; 3- to’g’ri tishli silindrik g’ildirakli reduktor;
4- mufta; 5-lentali konveyer barabani.

,, Bir pog’anali silndirsimon reduktor“ loyihasining xisoboti:

Variant №	Pb , kVt	nb , min^-1	Db , mm
13	3.6	80	750

I. Elektrodvigatel tanlash va yuritmaning kinematic xisobi.
1. Elektrodvigateldan talab qilinadigan quvvat:
P_t= kVt
η_um – yuritmaning umumiy foydali ish koeffitsienti
η₁=0.96 η₂=0.97 η₃=0.99 η_um= η₁·η₂·η₃³ η_um=0.903
P_t= P_t= P_t=3.98 kVt
Jadvaldan quvvati P_dv=3.6 kVt; sinxron aylanishlar soni n_s=750 min^-1; sirpanish s=2.5%; markasi 160S8 bo’lgan elektrodvigatel tanlaymiz.
Elektrodvigatelning nominal aylanishlar soni n_dv=n_s·(1-s) n_dv=750·(1-0.025) n_dv=731.25min^-1
2. Yuritmaning umumiy uzatishlar nisbati
i_um= i_um= i_um=9.14
i_um= i_tas· u_red i_tas=3.046 deb qabul qilamiz. u_red= u_red= u_red= 3
standart bo’yicha u_red= 8 deb qabul qilamiz.
Shunda:
i_tas= i_tas= i_tas=1.14 i_tas= 3 deb qabul qilamiz.
i_{um 1}= i_tas· u_red i_{um 1}=1.14·3 i_{um 1}=3.42
3. Uzatishlar nisbatining farqi
Δi= ·100 Δi= -0.028 -0.028 ≤ 3% shart bajarilmoqda.
4. Yuritma vallaridagi quvvat, aylanishlar chastotasi, burchak tezligi va burovchi momentlarni aniqlash.
a) birinchi val
P₁= P_t P₁= 3.98 kVt ; n₁= n_dv n₁= 731.25 min^-1 ω₁= ω₁= 76.537 sek^-1
T₁= 9550· T₁= 9550· T₁= 0.0054 N·m
b) ikkinchi val
P₂= P₁·η₁·η₂ P₂= 3.98·0.96·0.99 P₂= 3.78 kVt
n₂= n₂= n₂= 641.44 min-1
ω₂= ω₂= ω₂= 67.13 sek^-1
T₂= 9550· T₂= 9550· T₂= 857.63 N·m
d) uchinchi val
P₃= P₂·η₂·η₃ P₃= 3.78·0.97·0.99 P₃= 3.62 kVt
n₃= n₃= n₃= 213.81 min^-1
ω₃= ω₃= ω₃= 31.4 sek^-1
T₃= 9550· T₃= 9550· T₃= 161.69 N·m
II. Reduktor tishli g’ildiraklarining xisobi
1. Shesternya va tishli g;ildirak uchun material tanlab, ular uchun ruxsat etilgan kuchlanishlarni aniqlaymiz.
3.3- jadvaldan o’rtacha mexanik xarakteristikali material tanlaymiz. Shesternya uchun HB1= 230, tishli g’ildirak uchun HB2= 200 bo’lgan Po’lat 45 materialini tanlaymiz. Termik ishlovi- yaxshilash.
Ruxsat etilgan kontakt kuchlanish:
σH=σ_Hlimb·
σ₁- sikllarning asosiy sonidagi kontakt mustahkamlik chegarasi, σ_Hlimb= 2HB+70
KHL= 1 umirboqiylik koeffitsienti, (SH)= 1.1 xavfsizlik koeffitsienti,
Shesternya uchun, (σH1)= (σH1)= (σH1)= 481.818 MPa
Tishli g’ildirak uchun (σH2)= (σH2)= (σH2)= 427.273 MPa
Shunda to’g’ri tishli g’ildirak uchun ruxsat etilgan xisobiy kontakt kuchlanish,
(σH)= (σH) (σH)= 409.09 MPa
2. Tishlarning faol sirtlari kontakt mustaxkamligi shartidan o’qlararo masofani hisoblaymiz,

aw= Ka(u+1)· aw= 43(8+1)·

aw= 310.42 mm
Ka= 43 u= u_red u= 8 KH𝛃= 1.25 𝟁ba= 0.4 T₃= 1768.97 N·m
Standart bo’yicha aw= 315 mm deb qabul qilamiz.
3. Normal modulni aniqlaymiz,
m_n= (0.01∶0.02)·aw m_n= (0.01∶0.02)·315 m_n= 3.15∶6.3 mm
Standart bo’yicha m_n= 4 mm deb qabul qilamiz.
4. Shesternya va tishli g’ildirak tishlari sonini aniqlaymiz.
Z₁= 2· z₁= 2· Z₁= 17.237 Z₁= 17 deb qabul qilamiz.
Shunda, Z₂= Z₁·u Z₂= 17*8 Z₂= 136 Z₂= 136 deb qabul qilamiz.
5. Shesternya va tishli g’ildiraklarning asosiy o’lchamlari:
Bo’luvchi diametrlari,
d₁= mn·Z_1/COSB d₁= 4·17/0.971 d₁= 70 mm, d₂= mn·Z_2/COSB d₂= 4·136/0.971 d₂= 560 mm
Tekshiruv: aw= aw= aw= 315mm
Tishlar cho’qqisining diametrlari,
da₁= d₁+2·mn da₁= 70+2·4 da₁= 78 mm
da₂= d₂+2·mn da₂= 560+2·4 da₂= 568 mm
Tishli g’ildirak eni,
b₂= ba·aw b₂= 0.4·315 b₂= 126 mm
Shesternyaning eni,
b₁= b₂+5 b₁= 131 mm
Shesternya eni koeffitsientini diametr bo’yicha aniqlaymiz,
𝟁bd= 𝟁bd= 𝟁bd= 1.87
Tishli g’ildiraklarning aylana tezligini aniqlaymiz,
ν= ω_2· ν= 25.12_· ν= 8.79 m/s
ν= 1.16 m/s da to’g’ri tishli g’ildiraklar aniqlik darajasini 8 deb qabul qilamiz.
6. Yuklanish koeffitsienti
KH= KH𝛃·KHα·KHʋ
KHα= 1.09 yuklamaning tishlararo taqsimlanishini hisobga oluvchi koeffitsienti
KH𝛃= 1.06 tishli g’ildirak gardishi bo’yicha yuklamaning notekis taqsimlanishini hisobga oluvchi koeffitsient,
KHʋ= 1 dinamik koeffitsient, deb qabul qilamiz.
KH= 1.06·1·1.09 KH= 1.155
7. Kontakt kuchlanishni quyidagi formula bo’yicha tekshiramiz:
σH= σH= σH= 154.2 MPa
σH˂(σH) 154.2 ˂ 409.09 MPa
8. Tishli ilashmaga tasir etuvchi kushlar:
Aylana kuch,
Ft= 2· Ft= 2· Ft= 2272.4 N
Radial kuch,
𝛃= 13° tg𝛃= 0.23 Fr= Ft·tgα Fr= 2272.4·0.23 Fr= 524.62N
9. Tishlarni egilishdagi kuchlanish bo’yicha mustahkamlikka tekshiramiz:
σF= ≤ (σF)
KF= KF𝛃·KFʋ - yuklanish koeffitsienti, KF𝛃= 1.4 – tish uzunligi bo’yicha yuklamaning notrkis taqsimlanishini hisobga oluvchi koeffitsient, KFʋ= 1.16 – yuklamaning dinamik tasirini xisobga oluvchi koeffitsient.
Shunda, KF= 1.4·1.16 KF= 1.276
YF - tish shaklini xisobga oluvchi koeffitsient ГОСТ 21354-75.
Shesternyaniki, Zʋ₁= Z_1/COS𝛃³ Zʋ₁= 18.569 YF₁= 4.28
Tishli g’ildirakniki, Zʋ₂= Z_{2/ COS}𝛃³ Zʋ₂= 148.552 YF₂= 3.6
Ruxsat etilgan kuchlanish, (σF)= (SF)= 1.75 -xavfsizlik koeffitsienti,
σFlimb -tsikllarning asosiy soniga mos keluvchi mustahkamlik chegarasi.
Shesterbya uchun,
σ1Flimb= 1.8·HB1 σ1Flimb= 1.8·230 σ1Flimb= 414 MPa
Tishli g’ildirak uchun,
σ2Flimb= 1.8·HB12 σ2Flimb= 1.8·200 σ2Flimb= 360 MPa.
Shunda ruxsat etilgan kuchlanish quyidagicha:
Shesternya uchun,
(σF1)= (σF1)= 236.571 MPa
Tishli g’ildirak uchun,
(σF2)= (σF2)= 205.714 MPa
Quyidagi munosabatni , yani shesterbya va tishli g’ildirak uchun ruxsat etilgan kuchlanishni ular tishlarining shakliga nisbatini xisoblaymiz:
Shesternya uchun, = 55.37MPa,
Tishli g’ildirak uchun, = 57.22 MPa.
Tishli g’ildirak tishining mustahkamligini tekshiramiz:
σF2=
σF2= σF2= 4.763 MPa